技术领域technical field
本发明属于实验设备技术领域，更具体地说，是涉及一种力学实验装置，本发明同时还涉及一种应用所述的实验装置进行实验的方法。The invention belongs to the technical field of experimental equipment, more specifically, relates to a mechanical experiment device, and also relates to an experiment method using the experimental device.
背景技术Background technique
结构力学实验教学常用的实验装置中，刚架或桁架相关的实验装置比较多见，其共同特点是装置结构类型在试验过程中是不能变化的。因此进行不同实验时，需要制作不同的实验装置，这样，不仅增加了试验成本，而且进行不同实验时，需要使用不同的实验装置，也增加了实验室场地，影响实验场地的使用效率。Among the experimental devices commonly used in the experimental teaching of structural mechanics, experimental devices related to rigid frames or trusses are more common, and their common feature is that the structure type of the device cannot be changed during the test. Therefore, when conducting different experiments, different experimental devices need to be made. In this way, not only the test cost is increased, but also different experimental devices need to be used when different experiments are carried out, which also increases the laboratory space and affects the use efficiency of the experimental site.
发明内容Contents of the invention
本发明所要解决的技术问题是：针对现有技术中存在的不足，本发明所提出的是一种能够进行横梁的弯曲正应力测定、压弯组合变形实验、桁架的内力测定实验、静定结构内力测定、超静定结构内力测定等多种实验的力学实验装置，本发明所述的实验装置，通过横梁与立柱之间更换不同结构和截面尺寸的拉杆，实现不同类型结构之间的转换，特别是在静定与超静定结构之间实现方便转换。The technical problem to be solved by the present invention is: aiming at the deficiencies in the prior art, the present invention proposes a method capable of measuring the bending normal stress of the beam, the combined deformation experiment of compression and bending, the measurement experiment of the internal force of the truss, and the statically determinate structure Mechanics experimental device for various experiments such as internal force measurement and statically indeterminate structure internal force measurement. The experimental device described in the present invention realizes the conversion between different types of structures by replacing the tie rods with different structures and cross-sectional sizes between the beam and the column. In particular, it is convenient to switch between statically determinate and hyperstatically indeterminate structures.
要解决以上所述的技术问题，本发明采取的技术方案为：To solve the technical problems described above, the technical solution adopted by the present invention is:
本发明为一种力学实验装置，所述的装置为一种力学实验装置，包括底座，立柱，横梁，立柱底部一端与底座连接，立柱另一端与横梁连接，横梁两端部分别设置用于放置砝码的砝码支撑杆盘，横梁位于立柱两侧的部分分别粘贴应变片，每个应变片分别与静态电阻应变仪连接。The present invention is a kind of mechanical experiment device, and described device is a kind of mechanical experiment device, comprises base, upright post, beam, one end of the bottom of upright post is connected with base, the other end of upright post is connected with cross beam, and the two ends of cross beam are respectively arranged for placing The weight supports the rod plate of the weight, and the parts of the crossbeam located on both sides of the column are respectively pasted with strain gauges, and each strain gauge is respectively connected with a static resistance strain gauge.
所述的立柱位于底部的一端垂直连接在底座上，横梁中间部位与立柱中间部位连接，横梁与立柱之间呈T字形结构，立柱的立柱上端部与横梁左端部和横梁右端部之间分别设置左拉杆和右拉杆。One end of the column at the bottom is vertically connected to the base, the middle part of the beam is connected to the middle part of the column, the beam and the column are in a T-shaped structure, and the upper end of the column and the left end of the beam and the right end of the beam are respectively arranged Left and right tie rods.
所述的横梁左端部和横梁右端部上各设置安装一个连接耳，立柱上端部设置左卡孔和右卡孔，左拉杆和右拉杆两端头分别设置限位杆，左拉杆的两个限位杆设置为能分别卡在横梁左端部上的连接耳和左卡孔上的结构，右拉杆的两个限位杆设置为能分别卡在横梁右端部上的连接耳和右卡孔上的结构，左拉杆和右拉杆上分别粘贴应变片，横梁左端部和横梁右端部的四面分别粘贴应变片，每个应变片分别与静态电阻应变仪连接构成测量电桥。The left end of the crossbeam and the right end of the crossbeam are each equipped with a connecting ear, the upper end of the column is provided with a left clamping hole and a right clamping hole, the two ends of the left pull rod and the right pull rod are respectively provided with limit rods, and the two limit rods of the left pull rod The positioning rod is set to be able to be respectively clamped on the connecting ear on the left end of the beam and the structure on the left clamping hole, and the two limit rods of the right pull rod are set to be respectively clamped on the connecting ear on the right end of the beam and on the right clamping hole. Structure, strain gauges are pasted on the left and right rods respectively, strain gauges are pasted on the four sides of the left end of the beam and the right end of the beam respectively, and each strain gauge is respectively connected with a static resistance strain gauge to form a measuring bridge.
所述的立柱两侧分别设置左卡槽和右卡槽，横梁包括左横梁组件和右横梁组件，左横梁组件与立柱连接的一端设置左卡紧板，右横梁组件与立柱连接的一端设置右卡紧板，左卡紧板和右卡紧板分别卡装在左卡槽和右卡槽内，左卡槽和右卡槽两侧分别设置3个定位螺栓，定位螺栓设置为分别将左横梁组件和右横梁组件卡紧在左卡槽和右卡槽内的结构，当采用位于横梁中心线上的1个定位螺栓连接时，构成铰链连接，当采用3个定位螺栓连接时，构成固定端连接。The two sides of the column are respectively provided with a left clamping groove and a right clamping groove. The beam includes a left beam assembly and a right beam assembly. The clamping plate, the left clamping plate and the right clamping plate are respectively clamped in the left clamping groove and the right clamping groove, and three positioning bolts are respectively arranged on both sides of the left clamping groove and the right clamping groove, and the positioning bolts are set to respectively fix the left beam The structure that the component and the right beam component are clamped in the left and right clamping grooves, when connected by one positioning bolt located on the center line of the beam, constitutes a hinge connection, and when connected by three positioning bolts, constitutes a fixed end connect.
所述的左拉杆包括左杆件Ⅰ和左杆件Ⅱ，左杆件Ⅰ和左杆件Ⅱ之间通过调节螺杆Ⅰ连接，右拉杆包括右杆件Ⅰ和右杆件Ⅱ，右杆件Ⅰ和右杆件Ⅱ之间通过调节螺杆Ⅱ连接，左拉杆和右拉杆上粘贴的应变片与静态电阻应变仪连接构成测量电桥，所述的底座1设置为十字形结构。The left pull rod includes a left rod I and a left rod II, the left rod I and the left rod II are connected by an adjusting screw I, the right pull rod includes a right rod I and a right rod II, and the right rod I It is connected with the right rod II through the adjustment screw II, and the strain gauges pasted on the left and right rods are connected with the static resistance strain gauge to form a measuring bridge, and the base 1 is set in a cross-shaped structure.
本发明同时还涉及一种应用上述的力学实验装置进行静定结构实验的方法，所述的进行静定结构实验的步骤是：The present invention also relates to a method for applying the above-mentioned mechanical experiment device to carry out a statically determinate structure experiment, and the described steps for performing a statically indeterminate structure experiment are:
将横梁与立柱连接成T字形结构，3个定位螺栓都安装上构成固定端，分2组同时进行实验。将横梁左端部和横梁右端部的应变片接入静态电阻应变仪的测量电桥，采用单臂半桥接法，即分别将横梁左端部和横梁右端部上的应变片为工作片，横梁右端部应变片为温度补偿片，再选者不受载的应变片作为温度补偿片，分2组同时在横梁左端部和横梁右端部的砝码支撑杆盘加载砝码，采用等量逐级加载法，测量横梁左端部和横梁右端部的工作片的应变值，按照公式σ测量＝Eε测量计算横梁左端部和横梁右端部工作片处的应力，分别与材料力学中的弯曲正应力计算结果比较，计算相对误差，验证计算公式正确性。此为梁的横力弯曲正应力实验。The beam and the column are connected to form a T-shaped structure, and the three positioning bolts are installed to form the fixed end, and the experiment is carried out in two groups at the same time. Connect the strain gauges at the left end of the beam and the right end of the beam to the measurement bridge of the static resistance strain gauge, and use the single-arm half-bridge connection method, that is, the strain gauges on the left end of the beam and the right end of the beam are used as working sheets, and the right end of the beam The strain gauges are temperature compensation gauges, and the unloaded strain gauges are selected as temperature compensation gauges, and are divided into two groups to load weights on the weight support rod disks at the left end of the beam and the right end of the beam at the same time, using the equal-volume step-by-step loading method , measure the strain value of the working piece at the left end of the beam and the right end of the beam,measure and calculate the stress at the working piece at the left end of the beam and the right end of the beam according to the formulaσmeasurement =Eεmeasurement, and compare with the calculation results of the bending normal stress in material mechanics respectively, Calculate the relative error and verify the correctness of the calculation formula. This is the transverse force bending normal stress test of the beam.
所述的进行静定结构实验的步骤是：The described step of carrying out the statically determinate structure experiment is:
1)将横梁与立柱连接成T字形结构，只安装位于横梁中心线上的1个定位螺栓，构成铰链连接，再安装左拉杆和右拉杆，构成静定三角架式结构，其中横梁受压缩与弯曲组合变形，左拉杆和右拉杆受拉伸变形。分别将横梁左端部、横梁右端部、左拉杆和右拉杆的应变片接入静态电阻应变仪构成测量电桥，采用单臂半桥接法和等量逐级加载法，首先使用直径为10mm的拉杆，测出左拉杆、右拉杆的应变，再按照σ＝Eε计算工作片处的应力和拉杆的轴力，与材料力学拉伸变形的理论计算结果比较，计算相对误差，同时测量横梁左端部和横梁右端部处的工作片的应变，与拉伸与弯曲组合变形的计算结果相比较，计算相对误差；1) The beam and the column are connected into a T-shaped structure, and only one positioning bolt located on the center line of the beam is installed to form a hinge connection, and then the left tie rod and the right tie rod are installed to form a statically determinate tripod structure, in which the beam is compressed and Bending combined deformation, left tie rod and right tie rod are stretched and deformed. The strain gauges of the left end of the beam, the right end of the beam, the left tie rod and the right tie rod are connected to the static resistance strain gauge to form a measuring bridge, and the single-arm half-bridge method and the equivalent step-by-step loading method are used. First, a tie rod with a diameter of 10mm is used. , measure the strain of the left tie rod and the right tie rod, and then calculate the stress at the work piece and the axial force of the tie rod according to σ=Eε, compare it with the theoretical calculation results of the tensile deformation of the material mechanics, calculate the relative error, and measure the left end of the beam and Comparing the strain of the working piece at the right end of the beam with the calculation result of the combined deformation of tension and bending, the relative error is calculated;
2)在保持加载负荷不变的前提下，更换不同类型和尺寸的左拉杆和右拉杆，观察左拉杆和右拉杆的轴力和左拉杆和右拉杆上的应变片的应变值有无变化；观察横梁左端部和横梁右端部的应变片处应变有无变化，若无变化，说明静定结构的内力与杆件材料和截面尺寸无关；2) Under the premise of keeping the loading load unchanged, replace the left and right tie rods of different types and sizes, and observe whether the axial force of the left and right tie rods and the strain value of the strain gauges on the left and right tie rods have changed; Observe whether there is any change in the strain at the strain gauges at the left end of the beam and the right end of the beam. If there is no change, it means that the internal force of the statically determinate structure has nothing to do with the rod material and cross-sectional size;
3)在保持加载负荷不变的前提下，调节左拉杆和右拉杆的长度，观测横梁左端部、横梁右端部、左拉杆和右拉杆上的应变片的应变值有无变化；若无变化，说明静定结构内力与左拉杆和右拉杆的制造误差无关。3) On the premise of keeping the load constant, adjust the length of the left tie rod and the right tie rod, and observe whether the strain values of the strain gauges on the left end of the beam, the right end of the beam, the left tie rod and the right tie rod have changed; if there is no change, It shows that the internal force of the statically indeterminate structure has nothing to do with the manufacturing error of the left and right tie rods.
4)将左拉杆和右拉杆用桁架结构替代，重复上述步骤1)～2)，就是桁架结构的力学实验。4) Replace the left tie rod and the right tie rod with a truss structure, and repeat the above steps 1) to 2), which is the mechanical experiment of the truss structure.
本发明同时还涉及一种应用上述的力学实验装置进行超静定结构实验的方法，所述的进行超静定结构实验的步骤是：The present invention also relates to a method for applying the above-mentioned mechanical experiment device to carry out hyperstatic structure experiments, and the steps for performing hyperstatic structure experiments are:
1)将横梁与立柱连接成T字形结构，3个定位螺栓都安装上构成固定端，安装左拉杆和右拉杆，构成超静定三角架式结构；分别将横梁位于立柱两侧的应变片接入静态电阻应变仪的测量电桥；1) Connect the beam and the column to form a T-shaped structure, install the three positioning bolts to form a fixed end, install the left tie rod and the right tie rod to form a super statically indeterminate tripod structure; respectively connect the strain gauges on both sides of the beam to the column into the measuring bridge of the static resistance strain gauge;
2)采用单臂半桥接法和等量逐级加载法，测量左拉杆和右拉杆处的应变片的应变值，与结构力学中求解超静定结构的方法得到的计算结果相比较，计算相对误差；2) Measure the strain values of the strain gauges at the left and right tie rods by using the single-arm half-bridge method and the equivalent step-by-step loading method. error;
3)保持加载负荷不变，转动左拉杆和右拉杆上的调节手柄，伸长或缩短左拉杆和右拉杆长度，模拟左拉杆和右拉杆上制造误差，观察横梁左端部、横梁右端部处应变片的应变值有无变化，若有变化，说明超静定结构的内力与左拉杆和右拉杆的制造误差密切相关；3) Keep the loading load constant, turn the adjustment handles on the left and right tie rods, extend or shorten the length of the left and right tie rods, simulate the manufacturing error on the left and right tie rods, and observe the strain at the left end of the beam and the right end of the beam Whether there is a change in the strain value of the sheet, if there is a change, it shows that the internal force of the statically indeterminate structure is closely related to the manufacturing error of the left and right tie rods;
4)在保持加载负荷不变的前提下，更换不同类型和尺寸的斜拉杆，观察横梁左端部和横梁右端部处应变片的应变值有无变化，若有变化，说明超静定结构的内力与左拉杆和右拉杆的材料和截面尺寸有关。4) Under the premise of keeping the loading load unchanged, replace the diagonal stay rods of different types and sizes, and observe whether the strain values of the strain gauges at the left end of the beam and the right end of the beam have changed. If there is a change, it indicates the internal force of the statically indeterminate structure It is related to the material and section size of the left and right tie rods.
采用本发明的技术方案，能得到以下的有益效果：Adopt technical scheme of the present invention, can obtain following beneficial effect:
本发明所述的力学实验装置，通过改变立柱与横梁的连接类型或更换不同结构和截面尺寸的左拉杆和右拉杆，实现不同类型结构之间的转换，形成多功能的力学实验装置，能够方便快捷地进行横梁的弯曲正应力测定、压弯组合变形实验、桁架的内力测定实验、静定结构内力测定、超静定结构内力测定等多种实验，适用范围广，实验步骤简便，操作简单，试验结果准确可靠。本发明所述的实验装置采用对称三角架式结构，结构紧凑，可2组实验同时进行，提高了试验效率。The mechanical experiment device of the present invention realizes the conversion between different types of structures by changing the connection type of the upright column and the cross beam or replacing the left tie rod and the right tie rod of different structures and cross-sectional sizes, forming a multifunctional mechanical experiment device, which can facilitate Quickly carry out various experiments such as bending normal stress measurement of beams, compression-bending combined deformation experiments, internal force measurement experiments of trusses, internal force measurements of statically indeterminate structures, and internal force measurements of super-statically indeterminate structures. The test results are accurate and reliable. The experimental device of the present invention adopts a symmetrical tripod structure with a compact structure, and can carry out two sets of experiments simultaneously, which improves the test efficiency.
附图说明Description of drawings
下面对本说明书各附图所表达的内容及图中的标记作出简要的说明：The following is a brief description of the contents expressed in the drawings of this manual and the marks in the drawings:
图1为本发明所述的力学实验装置的正视结构示意图；Fig. 1 is the schematic diagram of the front view structure of the mechanical experiment device of the present invention;
图2为图1所述的力学实验装置的A-A面的剖视结构示意图；；Fig. 2 is the sectional structural representation of the A-A plane of the mechanical experiment device described in Fig. 1;;
附图中标记分别为：1、底座；2、立柱；3、横梁；4、砝码支撑杆盘；5、静态电阻应变仪；6、立柱上端部；7、横梁左端部；8、横梁右端部；9、左拉杆；10、右拉杆；11、连接耳；12、左卡孔；13、右卡孔；14、左卡槽；15、右卡槽；16、左横梁组件；17、右横梁组件；18、左卡紧板；19、右卡紧板；20、定位螺栓；21、左杆件Ⅰ；22、左杆件Ⅱ；23、调节螺杆Ⅰ；24、右杆件Ⅰ；25、右杆件Ⅱ；26、调节螺杆Ⅱ；27、限位杆；28、砝码；29、应变片。The marks in the drawings are: 1. Base; 2. Upright column; 3. Beam; 4. Weight support rod plate; 5. Static resistance strain gauge; 9. Left tie rod; 10. Right tie rod; 11. Connecting ear; 12. Left card hole; 13. Right card hole; 14. Left card slot; 15. Right card slot; 16. Left beam assembly; 17. Right Beam assembly; 18. Left clamping plate; 19. Right clamping plate; 20. Locating bolt; 21. Left rod I; 22. Left rod II; 23. Adjusting screw I; 24. Right rod I; 25 , Right rod part II; 26, adjusting screw rod II; 27, limit rod; 28, weight; 29, strain gauge.
具体实施方式detailed description
下面对照附图，通过对实施例的描述，对本发明的具体实施方式如所涉及的各构件的形状、构造、各部分之间的相互位置及连接关系、各部分的作用及工作原理等作进一步的详细说明：Below with reference to the accompanying drawings, through the description of the embodiments, the specific embodiments of the present invention, such as the shape, structure, mutual position and connection relationship between the various parts, the role and working principle of the various parts, etc., will be further described. Detailed instructions:
如附图1、附图2所示，本发明为一种力学实验装置，所述的实验装置包括底座1，立柱2，横梁3，立柱2底部一端与底座1连接，立柱2另一端与横梁3连接，横梁3两端部分别设置用于放置砝码28的砝码支撑杆盘4，横梁3位于立柱2两侧的部分分别粘贴应变片29，每个应变片29分别与静态电阻应变仪5连接。通过改变立柱与横梁的连接类型或更换不同结构、材料和截面尺寸的左拉杆和右拉杆，实现不同类型结构之间的转换，形成多功能的实验装置，能够方便快捷地进行横梁的弯曲正应力测定、压弯组合变形实验、桁架的内力测定实验、静定结构内力测定、超静定结构内力测定等力学实验测量，由于采用对称三角架式结构，可2组实验同时进行，并且测量过程便捷，测量数据准确。As shown in accompanying drawing 1, accompanying drawing 2, the present invention is a kind of mechanical experiment device, described experimental device comprises base 1, column 2, beam 3, one end of column 2 bottom is connected with base 1, and column 2 other end is connected with beam 3 connection, the two ends of the crossbeam 3 are respectively provided with weight support rod discs 4 for placing the weight 28, and the parts of the crossbeam 3 located on both sides of the column 2 are respectively pasted with strain gauges 29, and each strain gauge 29 is respectively connected to the static resistance strain gauge 5 connections. By changing the connection type between the column and the beam or replacing the left and right tie rods with different structures, materials and cross-sectional sizes, the conversion between different types of structures can be realized, and a multifunctional experimental device can be formed, which can conveniently and quickly test the bending normal stress of the beam. Determination, compression-bending combined deformation experiment, truss internal force measurement experiment, statically indeterminate structure internal force measurement, super-statically indeterminate structure internal force measurement and other mechanical experiment measurements. Due to the symmetrical tripod structure, two groups of experiments can be carried out at the same time, and the measurement process is convenient. , the measurement data is accurate.
所述的立柱2位于底部的一端垂直连接在底座1上，横梁3中间部位与立柱2中间部位连接，横梁3与立柱2之间呈T字形结构，立柱2的上端部6与横梁左端部7和横梁右端部8之间分别设置左拉杆9和右拉杆10。左拉杆9和右拉杆10可以在实验过程中更换为具有不同材料、不同截面形状和尺寸拉杆，或更换为桁架结构形式的拉杆，便于进行力学测量。One end of the column 2 located at the bottom is vertically connected to the base 1, the middle part of the beam 3 is connected to the middle part of the column 2, the beam 3 and the column 2 are in a T-shaped structure, and the upper end 6 of the column 2 is connected to the left end 7 of the beam. A left tie rod 9 and a right tie rod 10 are arranged respectively between the cross beam and the right end 8 of the crossbeam. The left tie rod 9 and the right tie rod 10 can be replaced with tie rods with different materials, different cross-sectional shapes and sizes, or with tie rods in the form of a truss structure during the experiment, which is convenient for mechanical measurement.
所述的横梁左端部7和横梁右端部8上各设置安装一个连接耳11，立柱上端部6设置左卡孔12和右卡孔13，左拉杆9和右拉杆10两端头分别设置限位杆27，左拉杆9的两个限位杆27设置为能分别卡在横梁左端部7上的连接耳11和左卡孔12上的结构，右拉杆10的两个限位杆27设置为能分别卡在横梁右端部8上的连接耳11和右卡孔13上的结构，左拉杆9和右拉杆10上分别粘贴应变片，横梁左端部7和横梁右端部8的四面分别粘贴应变片，每个应变片分别与静态电阻应变仪5相连构成测量电桥。上述结构，实现了左拉杆和右拉杆的可靠连接，并且左拉杆和右拉杆拆卸安装方便快捷，能够有效提高实验工作的开展。The left end 7 of the crossbeam and the right end 8 of the crossbeam are each equipped with a connecting ear 11, the upper end of the column 6 is provided with a left clamping hole 12 and a right clamping hole 13, and the two ends of the left tie rod 9 and the right pull rod 10 are respectively provided with limiters. Rod 27, the two limit rods 27 of left tie rod 9 are set to the structure that can be respectively stuck on the connection ear 11 on the left end 7 of the beam and the structure on the left clamping hole 12, and the two limit rods 27 of right pull rod 10 are set to be able to The structures of the connection ear 11 and the right clamping hole 13 respectively clamped on the right end of the beam 8, the strain gauges are pasted on the left tie rod 9 and the right tie rod 10 respectively, and the strain gauges are pasted on the four sides of the left end 7 of the crossbeam and the right end 8 of the crossbeam respectively, Each strain gauge is respectively connected with the static resistance strain gauge 5 to form a measuring bridge. The above-mentioned structure realizes the reliable connection of the left tie rod and the right tie rod, and the disassembly and installation of the left tie rod and the right tie rod are convenient and quick, which can effectively improve the development of experimental work.
所述的立柱2两侧分别设置左卡槽14和右卡槽15，横梁3包括左横梁组件16和右横梁组件17，左横梁组件16与立柱2连接的一端设置左卡紧板18，右横梁组件17与立柱2连接的一端设置右卡紧板19，左卡紧板18和右卡紧板19分别卡装在左卡槽14和右卡槽15内，左卡槽14和右卡槽15两侧分别设置3个定位螺栓20，定位螺栓20设置为分别将左横梁组件16和右横梁组件17卡紧在左卡槽14和右卡槽15内的结构。通过这样的结构，能实现左横梁组件16和右横梁组件17分别与立柱两侧的可靠连接和拆卸，便于力学实验工作方便进行。The left clamping groove 14 and the right clamping groove 15 are arranged on both sides of the column 2 respectively, the beam 3 includes a left beam assembly 16 and a right beam assembly 17, and one end of the left beam assembly 16 connected to the column 2 is provided with a left clamping plate 18, and the right The end that the beam assembly 17 is connected with the column 2 is provided with a right clamping plate 19, and the left clamping plate 18 and the right clamping plate 19 are respectively clamped in the left clamping groove 14 and the right clamping groove 15, and the left clamping groove 14 and the right clamping groove Three positioning bolts 20 are respectively arranged on both sides of 15, and the positioning bolts 20 are arranged to fasten the left crossbeam assembly 16 and the right crossbeam assembly 17 in the left clamping groove 14 and the right clamping groove 15 respectively. Through such a structure, the reliable connection and disassembly of the left crossbeam assembly 16 and the right crossbeam assembly 17 to both sides of the column can be realized, which is convenient for mechanical experiments.
所述的左拉杆9包括左杆件Ⅰ21和左杆件Ⅱ22，左杆件Ⅰ21和左杆件Ⅱ22之间通过调节螺杆Ⅰ23连接，右拉杆10包括右杆件Ⅰ24和右杆件Ⅱ25，右杆件Ⅰ24和右杆件Ⅱ25之间通过调节螺杆Ⅱ26连接，左拉杆9和右拉杆10上粘贴的应变片分别与静态电阻应变仪5相连构成测量电桥。The left pull rod 9 includes a left rod I21 and a left rod II22, the left rod I21 and the left rod II22 are connected by an adjusting screw I23, the right pull rod 10 includes a right rod I24 and a right rod II25, and the right rod Part I24 and right rod part II25 are connected by adjusting screw rod II26, and the strain gauges pasted on the left tie rod 9 and the right tie rod 10 are respectively connected with the static resistance strain gauge 5 to form a measuring bridge.
所述的底座1设置为十字形结构，提高了底座放置时的稳定性。The base 1 is set in a cross-shaped structure, which improves the stability of the base when it is placed.
本发明同时还涉及一种应用上述的力学实验装置进行静定结构实验的方法，能够方便快捷地完成静定结构实验，所述的进行静定结构实验的步骤是：The present invention also relates to a method for performing statically determinate structure experiments using the above-mentioned mechanical experiment device, which can conveniently and quickly complete the statically indeterminate structure experiments. The steps for performing the statically indeterminate structure experiments are:
将横梁3与立柱2连接成T字形结构，3个定位螺栓都安装上构成固定端，分2组同时进行实验。将横梁左端部7和横梁右端部8的应变片接入静态电阻应变仪5的测量电桥，采用单臂半桥接法，横梁左端部7和横梁右端部8上的应变片作为工作片，再选者不受载的应变片作为温度补偿片，在横梁左端部7的砝码支撑杆盘4加载砝码，采用等量逐级加载法，测量横梁左端部7和横梁右端部8的工作片的应变值，按照公式σ测量＝Eε测量计算横梁左端部7和横梁右端部8工作片处的应力，分别与材料力学中的弯曲正应力计算结果比较，计算相对误差，验证计算公式正确性。此为梁的横力弯曲正应力实验。The beam 3 and the column 2 are connected to form a T-shaped structure, and the three positioning bolts are all installed to form a fixed end, and the experiment is carried out in two groups at the same time. Connect the strain gauges at the left end 7 of the beam and the right end 8 of the beam to the measurement bridge of the static resistance strain gauge 5, adopt the single-arm half-bridge connection method, and use the strain gauges on the left end 7 of the beam and the right end 8 of the beam as working sheets, and then Select the strain gauge that is not loaded as the temperature compensation sheet, load the weight on the weight support rod plate 4 at the left end of the beam 7, and use the equal amount step-by-step loading method to measure the working slices at the left end 7 of the beam and the right end 8 of the beam According to the formulaσmeasurement =Eεmeasurementand calculation of the stress at the working piece at the left end 7 of the beam and the right end 8 of the beam, respectively compare with the calculation results of the bending normal stress in material mechanics, calculate the relative error, and verify the correctness of the calculation formula. This is the transverse force bending normal stress test of the beam.
1)将横梁3与立柱2连接成T字形结构，只安装位于横梁中心线上的1个定位螺栓，构成铰链连接，再安装左拉杆9和右拉杆10，构成静定三角架式结构，其中横梁5受压缩与弯曲组合变形，左拉杆9和右拉杆10受拉伸变形。分别将横梁左端部7、横梁右端部8、左拉杆9和右拉杆10的应变片接入静态电阻应变仪5构成测量电桥，采用单臂半桥接法和等量逐级加载法，首先使用直径为10mm的拉杆，测出左拉杆9、右拉杆10的应变，再按照σ＝Eε计算工作片处的应力和拉杆的轴力，与材料力学拉伸变形的理论计算结果相比较，计算相对误差，同时测量横梁左端部7和横梁右端部8处的工作片的应变，与拉伸与弯曲组合变形的计算结果相比较，计算相对误差；1) Connect the beam 3 and the column 2 to form a T-shaped structure, only install one positioning bolt located on the center line of the beam to form a hinge connection, and then install the left tie rod 9 and the right tie rod 10 to form a statically determinate tripod structure. The beam 5 is deformed by combination of compression and bending, and the left tie rod 9 and the right tie rod 10 are deformed by tension. Connect the strain gages of the left end 7 of the beam, the right end 8 of the beam, the left tie rod 9 and the right tie rod 10 respectively to the static resistance strain gauge 5 to form a measuring bridge. The single-arm half-bridge method and the equivalent step-by-step loading method are used. For a tie rod with a diameter of 10mm, measure the strain of the left tie rod 9 and the right tie rod 10, and then calculate the stress at the work piece and the axial force of the tie rod according to σ=Eε, and compare it with the theoretical calculation results of the tensile deformation of the material mechanics. Error, measure the strain of the work sheet at the left end 7 of the beam and the right end 8 of the beam at the same time, compare it with the calculation result of the combined deformation of tension and bending, and calculate the relative error;
2)在保持加载负荷不变的前提下，更换不同类型和尺寸的左拉杆9和右拉杆10，观察左拉杆9和右拉杆10的轴力和左拉杆9和右拉杆10上的应变片的应变值有无变化；观察横梁左端部7和横梁右端部8的应变片处应变有无变化，若无变化，说明静定结构的内力与杆件材料和截面尺寸无关；2) Under the premise of keeping the load constant, replace the left tie rod 9 and the right tie rod 10 of different types and sizes, observe the axial force of the left tie rod 9 and the right tie rod 10 and the strain gauges on the left tie rod 9 and the right tie rod 10 Whether the strain value changes; observe whether the strain at the strain gauges at the left end 7 of the beam and the right end 8 of the beam changes. If there is no change, it means that the internal force of the statically determinate structure has nothing to do with the rod material and cross-sectional size;
3)在保持加载负荷不变的前提下，调节左拉杆9和右拉杆10的长度，观测横梁左端部7、横梁右端部8、左拉杆9和右拉杆10上的应变片的应变值有无变化；若无变化，说明静定结构内力与横梁3制造误差无关。3) On the premise of keeping the load constant, adjust the length of the left tie rod 9 and the right tie rod 10, and observe whether the strain gauges on the left end 7 of the crossbeam, the right end of the crossbeam 8, the left tie rod 9 and the right tie rod 10 have strain values change; if there is no change, it means that the internal force of the statically determinate structure has nothing to do with the manufacturing error of the beam 3.
4)将左拉杆和右拉杆用桁架结构替代，重复上述步骤1)～2)，就是桁架结构的力学实验。4) Replace the left tie rod and the right tie rod with a truss structure, and repeat the above steps 1) to 2), which is the mechanical experiment of the truss structure.
本发明同时还涉及一种应用上述的力学实验装置进行超静定结构实验的方法，能够方便快捷地完成超静定结构实验，所述的进行超静定结构实验的步骤是：The present invention also relates to a method for applying the above-mentioned mechanical experiment device to conduct hyperstatic structure experiments, which can conveniently and quickly complete hyperstatic structural experiments. The steps for performing hyperstatic structural experiments are:
1)将横梁3与立柱2连接成T字形结构，3个定位螺栓都安装上构成固定端，安装左拉杆和右拉杆，构成超静定三角架式结构；分别将横梁3位于立柱2两侧部位的应变片接入静态电阻应变仪5的测量电桥，安装左拉杆9和右拉杆10，构成超静定三角架式结构；1) Connect the beam 3 and the column 2 into a T-shaped structure, install the three positioning bolts to form a fixed end, and install the left and right tie rods to form a super statically indeterminate tripod structure; the beam 3 is located on both sides of the column 2 respectively The strain gauges in the position are connected to the measurement bridge of the static resistance strain gauge 5, and the left tie rod 9 and the right tie rod 10 are installed to form a super statically indeterminate tripod structure;
2)采用单臂半桥接法和等量逐级加载法，测量左拉杆9和右拉杆10处的应变片的应变值，与结构力学中求解超静定结构的方法得到的计算结果相比较，计算相对误差；2) Measure the strain values of the strain gauges at the left tie rod 9 and the right tie rod 10 by using the single-arm half-bridge method and the equivalent step-by-step loading method, and compare them with the calculation results obtained by solving the statically indeterminate structure in structural mechanics, Calculate the relative error;
3)保持加载负荷不变，转动左拉杆9和右拉杆10上的调节螺杆Ⅰ23和调节螺杆Ⅱ26，伸长或缩短左拉杆9和右拉杆10长度，模拟左拉杆9和右拉杆10上制造误差，观察横梁左端部7、横梁右端部8处应变片的应变值有无变化，若有变化，说明超静定结构的内力与左拉杆9、右拉杆10的制造误差密切相关；3) Keep the loading load constant, turn the adjustment screw I23 and the adjustment screw II26 on the left tie rod 9 and the right tie rod 10, extend or shorten the length of the left tie rod 9 and the right tie rod 10, and simulate the manufacturing error on the left tie rod 9 and the right tie rod 10 , observe whether the strain values of the strain gauges at the left end 7 of the crossbeam and the right end 8 of the crossbeam change. If there is any change, it indicates that the internal force of the statically indeterminate structure is closely related to the manufacturing error of the left tie rod 9 and the right tie rod 10;
4)在保持加载负荷不变的前提下，更换不同类型和尺寸的斜拉杆，观察横梁左端部7和横梁右端部8处应变片的应变值有无变化，若有变化，说明超静定结构的内力与左拉杆9、右拉杆10的材料和截面尺寸有关。4) Under the premise of keeping the loading load unchanged, replace the diagonal stay rods of different types and sizes, and observe whether the strain values of the strain gauges at the left end 7 of the beam and the right end 8 of the beam have changed. If there is a change, it indicates the statically indeterminate structure The internal force is related to the material and cross-sectional size of the left tie rod 9 and the right tie rod 10.
本发明所述的力学实验装置，改变立柱与横梁的连接类型或更换不同材料、结构和截面尺寸的左拉杆和右拉杆，实现不同类型结构之间的转换，形成多功能的力学实验装置，能够方便快捷地进行横梁的弯曲正应力测定、压弯组合变形实验、桁架的内力测定实验、静定结构内力测定、超静定结构内力测定等多种实验，适用范围广，实验步骤简便，操作简单，试验结果准确可靠。本发明所述的实验装置采用对称三角架式结构，结构紧凑，可2组实验同时进行，提高了试验效率。The mechanical experiment device of the present invention changes the connection type between the column and the cross beam or replaces the left and right rods of different materials, structures and cross-sectional sizes, so as to realize the conversion between different types of structures and form a multifunctional mechanical experiment device, which can It is convenient and quick to carry out various experiments such as the measurement of the bending normal stress of the beam, the combined deformation experiment of compression and bending, the measurement of the internal force of the truss, the measurement of the internal force of the statically indeterminate structure, and the measurement of the internal force of the hyperstatically indeterminate structure. , the test results are accurate and reliable. The experimental device of the present invention adopts a symmetrical tripod structure with a compact structure, and can carry out two sets of experiments simultaneously, which improves the test efficiency.
上面结合附图对本发明进行了示例性的描述，显然本发明具体的实现并不受上述方式的限制，只要采用了本发明的方法构思和技术方案进行的各种改进，或未经改进将本发明的构思和技术方案直接应用于其他场合的，均在本发明的保护范围内。The present invention has been exemplarily described above in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited by the above-mentioned manner, as long as various improvements are adopted in the method concept and technical solutions of the present invention, or the present invention is converted without improvement. The ideas and technical solutions of the invention that are directly applied to other occasions are within the protection scope of the present invention.
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410578594.4ACN104269088B (en) | 2014-10-25 | 2014-10-25 | Mechanical experimental device and method for conducting experiment by applying same |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410578594.4ACN104269088B (en) | 2014-10-25 | 2014-10-25 | Mechanical experimental device and method for conducting experiment by applying same |
| Publication Number | Publication Date |
|---|---|
| CN104269088Atrue CN104269088A (en) | 2015-01-07 |
| CN104269088B CN104269088B (en) | 2017-01-25 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410578594.4AExpired - Fee RelatedCN104269088B (en) | 2014-10-25 | 2014-10-25 | Mechanical experimental device and method for conducting experiment by applying same |
| Country | Link |
|---|---|
| CN (1) | CN104269088B (en) |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104751706A (en)* | 2015-03-31 | 2015-07-01 | 河海大学 | Two-span continuous beam bending moment influence line test experimental device |
| CN105352445A (en)* | 2015-11-16 | 2016-02-24 | 南京航空航天大学 | Unilateral clamped plate structure deformation optical fiber mode identification system and calibration method and application |
| CN106205303A (en)* | 2016-09-29 | 2016-12-07 | 安徽工程大学 | Instructional device and using method thereof for structural mechanics experiment |
| CN106327966A (en)* | 2016-09-23 | 2017-01-11 | 大连理工大学 | Assembly beam structure experiment model and method |
| CN106847055A (en)* | 2017-01-18 | 2017-06-13 | 山东省特种设备检验研究院泰安分院 | A kind of lifting machinery metal structure stress-strain test apparatus for demonstrating |
| CN106885735A (en)* | 2017-04-19 | 2017-06-23 | 青岛海检检测有限公司 | Umbilical cables stretch bending mechanics composite test device |
| CN106908330A (en)* | 2017-03-10 | 2017-06-30 | 浙江华电器材检测研究所 | Compound cross-arm single-direction and dual-direction combination bend test device |
| CN109357954A (en)* | 2018-12-23 | 2019-02-19 | 江苏莱特凯机械有限公司 | A kind of plate bending force bearing experiment device |
| CN109708565A (en)* | 2019-02-14 | 2019-05-03 | 北京市劳动保护科学研究所 | A monitoring device and system for a truss structure |
| CN110264836A (en)* | 2019-06-20 | 2019-09-20 | 西京学院 | A kind of mechanics of materials distortional stress apparatus for demonstrating |
| CN110718123A (en)* | 2019-10-10 | 2020-01-21 | 常州大学 | Non-metal rod piece stretch bending combined deformation experiment platform |
| CN110726394A (en)* | 2019-10-24 | 2020-01-24 | 上海航天精密机械研究所 | Calibrating device and method suitable for strain gauge pasting process |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1606989A1 (en)* | 1988-12-16 | 1990-11-15 | Усть-Каменогорский Строительно-Дорожный Институт | Educational appliance in mechanics |
| SU1734118A1 (en)* | 1989-10-23 | 1992-05-15 | Пензенский Государственный Педагогический Институт Им.В.Г.Белинского | Training device for mechanics |
| US20040115594A1 (en)* | 2002-10-18 | 2004-06-17 | Schoendorff Arthur Joseph | Teaching apparatus for mechanics principles |
| CN101303813A (en)* | 2008-01-30 | 2008-11-12 | 烟台大学 | Structural Mechanics Combined Experimental Device |
| CN201421416Y (en)* | 2009-04-03 | 2010-03-10 | 天津商业大学 | A Simple Experimental Device Applicable to the Course of Mechanics of Materials in Colleges and Universities |
| CN201984688U (en)* | 2011-01-05 | 2011-09-21 | 辽宁工程技术大学 | Multipurpose static combined teaching aid |
| CN202008764U (en)* | 2011-01-10 | 2011-10-12 | 刘莹 | Mechanical demonstration teaching tool |
| CN102394020A (en)* | 2011-09-09 | 2012-03-28 | 哈尔滨工业大学（威海） | Building-block plane structure mechanical property universal experiment platform |
| CN102426808A (en)* | 2011-11-03 | 2012-04-25 | 西安交通大学 | Planar truss structural stability mechanics experimental apparatus |
| CN202485991U (en)* | 2012-04-03 | 2012-10-10 | 德州学院 | Rigid material strain test instrument |
| CN203118300U (en)* | 2013-04-02 | 2013-08-07 | 李颖 | Demonstration teaching aid for mechanics teaching |
| CN103247209A (en)* | 2013-04-23 | 2013-08-14 | 南昌航空大学 | Experimental device for testing internal stress of constant strength beam and torsion combination beam with electric measurement method |
| CN203148787U (en)* | 2013-04-15 | 2013-08-21 | 中国人民解放军空军第一航空学院 | Device for fatigue test of plane stress state |
| CN103761910A (en)* | 2014-01-13 | 2014-04-30 | 河海大学 | Structural mechanics displacement method experimental device and structural mechanics displacement method presentation method |
| CN104050848A (en)* | 2014-06-10 | 2014-09-17 | 安徽农业大学 | Material mechanics multi-experiment synchronous measuring device |
| CN204102392U (en)* | 2014-10-25 | 2015-01-14 | 安徽工程大学 | A kind of dynamics experimental device |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1606989A1 (en)* | 1988-12-16 | 1990-11-15 | Усть-Каменогорский Строительно-Дорожный Институт | Educational appliance in mechanics |
| SU1734118A1 (en)* | 1989-10-23 | 1992-05-15 | Пензенский Государственный Педагогический Институт Им.В.Г.Белинского | Training device for mechanics |
| US20040115594A1 (en)* | 2002-10-18 | 2004-06-17 | Schoendorff Arthur Joseph | Teaching apparatus for mechanics principles |
| CN101303813A (en)* | 2008-01-30 | 2008-11-12 | 烟台大学 | Structural Mechanics Combined Experimental Device |
| CN201421416Y (en)* | 2009-04-03 | 2010-03-10 | 天津商业大学 | A Simple Experimental Device Applicable to the Course of Mechanics of Materials in Colleges and Universities |
| CN201984688U (en)* | 2011-01-05 | 2011-09-21 | 辽宁工程技术大学 | Multipurpose static combined teaching aid |
| CN202008764U (en)* | 2011-01-10 | 2011-10-12 | 刘莹 | Mechanical demonstration teaching tool |
| CN102394020A (en)* | 2011-09-09 | 2012-03-28 | 哈尔滨工业大学（威海） | Building-block plane structure mechanical property universal experiment platform |
| CN102426808A (en)* | 2011-11-03 | 2012-04-25 | 西安交通大学 | Planar truss structural stability mechanics experimental apparatus |
| CN202485991U (en)* | 2012-04-03 | 2012-10-10 | 德州学院 | Rigid material strain test instrument |
| CN203118300U (en)* | 2013-04-02 | 2013-08-07 | 李颖 | Demonstration teaching aid for mechanics teaching |
| CN203148787U (en)* | 2013-04-15 | 2013-08-21 | 中国人民解放军空军第一航空学院 | Device for fatigue test of plane stress state |
| CN103247209A (en)* | 2013-04-23 | 2013-08-14 | 南昌航空大学 | Experimental device for testing internal stress of constant strength beam and torsion combination beam with electric measurement method |
| CN103761910A (en)* | 2014-01-13 | 2014-04-30 | 河海大学 | Structural mechanics displacement method experimental device and structural mechanics displacement method presentation method |
| CN104050848A (en)* | 2014-06-10 | 2014-09-17 | 安徽农业大学 | Material mechanics multi-experiment synchronous measuring device |
| CN204102392U (en)* | 2014-10-25 | 2015-01-14 | 安徽工程大学 | A kind of dynamics experimental device |
| Title |
|---|
| 杨晓丹: "多功能结构力学实验装置", 《实验室研究与探索》* |
| 杨贺等: "基于研究性实验的多功能组合式力学实验系统", 《力学与实践》* |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104751706A (en)* | 2015-03-31 | 2015-07-01 | 河海大学 | Two-span continuous beam bending moment influence line test experimental device |
| CN105352445A (en)* | 2015-11-16 | 2016-02-24 | 南京航空航天大学 | Unilateral clamped plate structure deformation optical fiber mode identification system and calibration method and application |
| CN105352445B (en)* | 2015-11-16 | 2017-11-24 | 南京航空航天大学 | Unilateral clamped plate malformation fiber mode identification system and scaling method and application |
| CN106327966A (en)* | 2016-09-23 | 2017-01-11 | 大连理工大学 | Assembly beam structure experiment model and method |
| CN106327966B (en)* | 2016-09-23 | 2022-05-13 | 大连理工大学 | An experimental model and experimental method of an assembled beam structure |
| CN106205303B (en)* | 2016-09-29 | 2022-02-11 | 安徽工程大学 | Teaching device for structural mechanics experiment and using method thereof |
| CN106205303A (en)* | 2016-09-29 | 2016-12-07 | 安徽工程大学 | Instructional device and using method thereof for structural mechanics experiment |
| CN106847055A (en)* | 2017-01-18 | 2017-06-13 | 山东省特种设备检验研究院泰安分院 | A kind of lifting machinery metal structure stress-strain test apparatus for demonstrating |
| CN106847055B (en)* | 2017-01-18 | 2023-01-20 | 山东省特种设备检验研究院泰安分院 | Stress-strain test demonstration device for metal structure of hoisting machinery |
| CN106908330A (en)* | 2017-03-10 | 2017-06-30 | 浙江华电器材检测研究所 | Compound cross-arm single-direction and dual-direction combination bend test device |
| CN106908330B (en)* | 2017-03-10 | 2024-03-26 | 浙江华电器材检测研究院有限公司 | Single-direction and double-direction combined bending test device for composite cross arm |
| CN106885735A (en)* | 2017-04-19 | 2017-06-23 | 青岛海检检测有限公司 | Umbilical cables stretch bending mechanics composite test device |
| CN109357954A (en)* | 2018-12-23 | 2019-02-19 | 江苏莱特凯机械有限公司 | A kind of plate bending force bearing experiment device |
| CN109708565A (en)* | 2019-02-14 | 2019-05-03 | 北京市劳动保护科学研究所 | A monitoring device and system for a truss structure |
| CN110264836B (en)* | 2019-06-20 | 2021-06-25 | 西京学院 | A material mechanics deformation stress demonstration device |
| CN110264836A (en)* | 2019-06-20 | 2019-09-20 | 西京学院 | A kind of mechanics of materials distortional stress apparatus for demonstrating |
| CN110718123A (en)* | 2019-10-10 | 2020-01-21 | 常州大学 | Non-metal rod piece stretch bending combined deformation experiment platform |
| CN110726394A (en)* | 2019-10-24 | 2020-01-24 | 上海航天精密机械研究所 | Calibrating device and method suitable for strain gauge pasting process |
| Publication number | Publication date |
|---|---|
| CN104269088B (en) | 2017-01-25 |
| Publication | Publication Date | Title |
|---|---|---|
| CN104269088B (en) | Mechanical experimental device and method for conducting experiment by applying same | |
| CN203982627U (en) | Multifunctional girder structure experimental provision | |
| CN102519652B (en) | Bolt pre-tightening force testing device and control method thereof | |
| CN102288483B (en) | Supporting clamp for compression stabilization experiment of reinforced wallboard and supporting coefficient testing method for end socket | |
| CN103207121B (en) | The force self-balanced charger of a kind of different column section node constant shaft | |
| CN106327966B (en) | An experimental model and experimental method of an assembled beam structure | |
| CN102706739B (en) | Glass four-point bending clamp | |
| CN104237002B (en) | Salt solution corrosion and loading test device | |
| CN204694465U (en) | Rubber support is resistance to compression and shearing strength proving installation under compound stress | |
| CN203101196U (en) | Multifunctional shear strength tester | |
| CN206038427U (en) | Synchronous testing device for tensile, compression and bending-pulling resilience modulus of pavement material | |
| CN113335560B (en) | Complex load box section or barrel section test device and method | |
| CN103196694B (en) | Composite material truss torsion experimental device and method | |
| CN205719811U (en) | A kind of three-point bending performance test frock | |
| CN103018102A (en) | Stationary fixture used for axial compression stability test of columnar bent plate | |
| JP2014037738A (en) | Load experimental device for test piece of shield tunnel | |
| CN103196757A (en) | Device and method for composite material member bar torsion experiment | |
| CN104316414A (en) | Overturning plate type bending device | |
| CN106370415B (en) | A device for automatically controlling the reciprocating load of an axial force-bearing member and a method of using the same | |
| CN204102392U (en) | A kind of dynamics experimental device | |
| CN107063901A (en) | The acquisition methods of Fatigue Strength of Concrete curve under a kind of curved scissors stress | |
| CN211816479U (en) | Mechanical property test device for enclosure pipe pile and underground pipe curtain | |
| CN111060391B (en) | A clamp device for plate tensile test and application method thereof | |
| CN108801906A (en) | A kind of loading device and method for bond-slip properties experiment | |
| CN108593175A (en) | A kind of workshop ball node flap seat vertical load measuring device and measuring method |
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee | Granted publication date:20170125 Termination date:20211025 |