CN110873092A - Electromagnetic reversing valve life reliability test hydraulic system - Google Patents
Electromagnetic reversing valve life reliability test hydraulic systemDownload PDFInfo
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Abstract
Translated fromChinese
Description
Translated fromChinese技术领域technical field
本发明涉及液压测试系统技术领域，尤其涉及一种电磁换向阀寿命可靠性测试液压系统。The invention relates to the technical field of hydraulic testing systems, in particular to a hydraulic system for testing the reliability of the life of an electromagnetic reversing valve.
背景技术Background technique
随着液压技术和电磁换向阀产品的不断发展，高级设备自动化控制对产品可靠性提出寿命数据要求，液压电磁换向阀的应用越来越广泛，产品可靠性寿命成为设备先进性的标志。目前国产各种型号电磁换向阀基本没有寿命试验数据，元件结构存在不可靠等问题，而且现有液压系统回路存在回路工作故障率高、寿命低、维修成本高等可靠性不高的缺点。所以需要设计一种电磁换向阀寿命可靠性测试液压系统，对电磁换向阀进行符合GBT35023-2018(液压元件可靠性评估方法)国标认可的可靠性和寿命检测。With the continuous development of hydraulic technology and electromagnetic directional valve products, advanced equipment automation control puts forward life data requirements for product reliability. At present, there is basically no life test data for various types of domestic electromagnetic directional valves, and the component structure is unreliable. Moreover, the existing hydraulic system circuit has the shortcomings of high circuit failure rate, low life, high maintenance cost and low reliability. Therefore, it is necessary to design a hydraulic system for the reliability test of electromagnetic directional valve life, and conduct reliability and life testing of the electromagnetic directional valve in accordance with the GBT35023-2018 (reliability assessment method for hydraulic components) national standard.
发明内容SUMMARY OF THE INVENTION
本发明的目的是提供电磁换向阀寿命可靠性测试液压系统，能够对电磁换向阀进行有效的可靠性和寿命检测，其通用化强、抗污染能力强且可靠性高。The purpose of the present invention is to provide a hydraulic system for reliability testing of electromagnetic directional valve life, which can perform effective reliability and service life testing on the electromagnetic directional directional valve, and has strong generalization, strong anti-pollution ability and high reliability.
本发明的上述技术目的是通过以下技术方案得以实现的：The above-mentioned technical purpose of the present invention is achieved through the following technical solutions:
一种电磁换向阀寿命可靠性测试液压系统，包括测试回路和液压动力源系统，所述测试回路包括并联的两组，所述液压动力源系统包括并联的两套，且两套所述液压动力源系统共用一个油箱；两套所述液压动力源系统和两组测试回路之间设有进油球阀组，通过切换所述进油球阀组的不同状态，两套所述液压动力源系统和两组测试回路之间可以排布三种供油形式；A hydraulic system for testing the reliability of life of an electromagnetic reversing valve, comprising a test circuit and a hydraulic power source system, wherein the test circuit includes two groups in parallel, the hydraulic power source system includes two sets in parallel, and the two sets of the hydraulic The power source system shares one oil tank; an oil inlet ball valve group is arranged between the two sets of the hydraulic power source system and the two sets of test circuits. By switching the different states of the oil inlet ball valve group, the two sets of the hydraulic power source system and the Three types of oil supply can be arranged between the two sets of test circuits;
每套所述液压动力源系统均包括高压泵、电机、双路背压阀组，所述电机电连接高压泵，所述高压泵的吸油口连接于油箱，所述双路背压阀组的出油口连接于油箱；Each set of the hydraulic power source system includes a high-pressure pump, a motor, and a dual-way back pressure valve group. The motor is electrically connected to the high-pressure pump, and the oil suction port of the high-pressure pump is connected to the oil tank. The oil outlet is connected to the oil tank;
每组测试回路包括N个并联的被测阀，每个所述被测阀包括A口、B口、P口和T口，所述被测阀的P口连接液压动力源系统，所述被测阀的T口连接双路背压阀组；每个所述被测阀的A口和B口分别连接有压力传感器，每个所述被测阀的A口和B口之间还连接有位于两个压力传感器之间的测试阻尼装置。Each set of test circuits includes N parallel valves under test, each valve under test includes port A, port B, port P and port T, the port P of the valve under test is connected to the hydraulic power source system, and the valve under test is connected to the hydraulic power source system. The T port of the test valve is connected to a double-way back pressure valve group; the A port and the B port of each of the tested valves are respectively connected with a pressure sensor, and a pressure sensor is also connected between the A port and the B port of each of the tested valves. Test damping device located between two pressure transducers.
通过采用上述技术方案，两组液压动力源系统为两组测试回路提供油液，根据需要切换进油球阀组的通断情况来实现三种不同供油形式的选择。油液从进油球阀组进入每个被测阀的P口，从每个被测阀的T口经过双路背压阀组回到油箱。每个被测阀经过测试阻尼装置的缓冲作用后的A口及B口的压力经过对应的压力传感器反馈压力信号，经记录器后记录压力变动波形和变动数，通过压力变动波形和变动数来判断被测阀的使用寿命和可靠性，标准通用化强、抗污染能力强、可靠性高。By adopting the above technical solution, two sets of hydraulic power source systems provide oil for two sets of test circuits, and the on-off condition of the oil inlet ball valve group can be switched according to needs to realize the selection of three different oil supply forms. The oil enters the P port of each valve under test from the oil inlet ball valve group, and returns to the oil tank from the T port of each valve under test through the two-way back pressure valve group. The pressure of port A and port B of each valve under test after the buffering effect of the damping device is tested, and the pressure signal is fed back through the corresponding pressure sensor, and the pressure fluctuation waveform and number of fluctuations are recorded after the recorder. Judging the service life and reliability of the valve under test, the standard is strong, the anti-pollution ability is strong, and the reliability is high.
进一步地，所述测试回路和双路背压阀组之间设有回油球阀组，通过切换所述回油球阀组的不同状态，两组所述测试回路可以排布三种回油方式。Further, an oil return ball valve group is arranged between the test circuit and the dual back pressure valve group. By switching different states of the oil return ball valve group, the two groups of test circuits can be arranged in three oil return modes.
通过采用上述技术方案，设置回油球阀组和双路背压阀组配合，可以根据实际使用的需要，切换回油球阀组的状态，保证油液回路的连通，从而保证测试回路的正常测试工作以及测试的安全性，其结构简单，效果明显。By adopting the above technical solution, the oil return ball valve group and the two-way back pressure valve group are arranged to cooperate, and the state of the oil return ball valve group can be switched according to the actual needs, so as to ensure the connection of the oil circuit, so as to ensure the normal test work of the test circuit. As well as the safety of the test, its structure is simple and the effect is obvious.
进一步地，所述高压泵的吸油口和油箱之间设有蝶阀，所述蝶阀与油箱连接，且所述蝶阀和高压泵的吸油口之间还设有避振喉。Further, a butterfly valve is arranged between the oil suction port of the high pressure pump and the oil tank, the butterfly valve is connected to the oil tank, and a vibration isolation throat is also arranged between the butterfly valve and the oil suction port of the high pressure pump.
通过采用上述技术方案，蝶阀的设置能够在高压泵损坏时切断供油，避免油液泄漏，保证安全性。而避振喉的设置起到很好的减振作用，避免高压泵工作时震动较大，影响油路的稳定性。By adopting the above technical solutions, the butterfly valve can cut off the oil supply when the high-pressure pump is damaged, avoid oil leakage and ensure safety. The setting of the anti-vibration throat plays a very good role in damping vibration, avoiding the large vibration when the high-pressure pump is working, which affects the stability of the oil circuit.
进一步地，所述高压泵的出油口连接有调压阀组，且所述高压泵的出油口和调压阀组之间设有单向阀。Further, a pressure regulating valve group is connected to the oil outlet of the high pressure pump, and a check valve is arranged between the oil outlet of the high pressure pump and the pressure regulating valve group.
通过采用上述技术方案，调压阀组对进入测试回路的油液进行调压处理，避免经常测试回路的油液压力过高，容易发生爆管，保证测试回路的正常测试工作。而单向阀的设置避免发生油液回流，上述结构简单但效果明显。By adopting the above technical solution, the pressure regulating valve group regulates the oil entering the test circuit, so as to prevent the oil pressure of the test circuit from being too high and easy to burst, so as to ensure the normal test work of the test circuit. The arrangement of the one-way valve avoids the occurrence of oil backflow, and the above-mentioned structure is simple but the effect is obvious.
进一步地，所述调压阀组和进油球阀组之间设有高压过滤器，所述进油球阀组和每组测试回路中设有一个与每个被测阀的P口连接的蓄能器。Further, a high-pressure filter is arranged between the pressure regulating valve group and the oil inlet ball valve group, and an energy storage connected to the P port of each tested valve is arranged in the oil inlet ball valve group and each group of test circuits. device.
通过采用上述技术方案，高压过滤器对进入测试回路中的油液起到过滤作用，保证进入测试回路中的油液的清洁，从而避免油液中的杂质导致被测阀发生磨损而影响被测阀寿命的测试结果。蓄能器的设置能够实现保压，保证测试回路中油液压力的平稳。By adopting the above technical solution, the high-pressure filter plays a role in filtering the oil entering the test circuit, ensuring the cleanliness of the oil entering the test circuit, thereby preventing impurities in the oil from causing wear of the tested valve and affecting the tested valve. Valve life test results. The setting of the accumulator can keep the pressure and ensure the stability of the oil pressure in the test circuit.
进一步地，所述油箱内设有隔板，所述隔板将油箱分为吸油区和回油区，两套所述液压动力源系统和吸油区连接，所述双路背压阀组和回油区连接；所述隔板上设有滤网，所述油箱吸油区底部还设有磁铁。Further, the oil tank is provided with a baffle, the baffle divides the oil tank into an oil suction area and an oil return area, two sets of the hydraulic power source systems are connected to the oil suction area, and the two-way back pressure valve group and return The oil area is connected; the separator is provided with a filter screen, and the bottom of the oil suction area of the oil tank is also provided with a magnet.
通过采用上述技术方案，隔板将油箱分割为吸油区和回油区，滤网的设置不仅能够保证吸油区和回油区油液的互通，还能对回油区的油液进行过滤，避免经过循环的油液携带的杂质进入吸油区。而设置在吸油区的磁铁能够吸附油液中的金属杂质，保证吸油区供油的清洁。By adopting the above technical solution, the baffle plate divides the oil tank into the oil suction area and the oil return area. The setting of the filter screen can not only ensure the intercommunication of the oil in the oil suction area and the oil return area, but also filter the oil in the oil return area to avoid The impurities carried by the circulating oil enter the oil suction area. The magnets arranged in the oil suction area can absorb metal impurities in the oil to ensure the cleanliness of the oil supply in the oil suction area.
进一步地，所述油箱内安装有温度控制器，两组所述测试回路中与液压动力源系统连接的第一个被测阀的P口和对应的蓄能器之间也设有温度控制器；所述油箱内安装有由温度控制器通信控制的电加热器。Further, a temperature controller is installed in the oil tank, and a temperature controller is also provided between the P port of the first tested valve connected to the hydraulic power source system in the two sets of test circuits and the corresponding accumulator. ; An electric heater controlled by temperature controller communication is installed in the oil tank.
通过采用上述技术方案，温度控制器和电加热器配合使用，当油液温度较低时，电加热器对油箱内的油液进行加热，保证油液的温度正常，可满足测试回路的使用需求。By adopting the above technical solution, the temperature controller and the electric heater are used together. When the oil temperature is low, the electric heater heats the oil in the oil tank to ensure the normal temperature of the oil, which can meet the needs of the test circuit. .
进一步地，所述油箱连接有油冷机，所述油冷机的出口连接有回油过滤器，所述回油过滤器的出油口与油箱连接。Further, the oil tank is connected with an oil cooler, the outlet of the oil cooler is connected with an oil return filter, and the oil outlet of the oil return filter is connected with the oil tank.
通过采用上述技术方案，在油液温度过高时，油冷机对油液进行降温处理，对油箱中的油液进行温度变化区间的控制。而回油过滤器则是对油液污染进行过滤，提高油液的清洁度。By adopting the above technical solution, when the temperature of the oil is too high, the oil cooler performs cooling treatment on the oil, and controls the temperature change interval of the oil in the oil tank. The oil return filter is to filter the oil pollution and improve the cleanliness of the oil.
进一步地，所述油箱内设有液位计，所述油箱内设有与液位计通信连接的液位控制器。Further, the oil tank is provided with a liquid level gauge, and the oil tank is provided with a liquid level controller in communication with the liquid level gauge.
通过采用上述技术方案，液位计和液位控制器配合使用，保证油箱内的油液充足，保证测试回路的正常测试工作，其结构简单，效果明显。By adopting the above technical scheme, the liquid level gauge and the liquid level controller are used together to ensure sufficient oil in the oil tank and normal test work of the test circuit. The structure is simple and the effect is obvious.
进一步地，所述油箱连接有空气滤清器。Further, the fuel tank is connected with an air filter.
通过采用上述技术方案，当油箱内的油液减少，空气进入油箱内时，空气滤清器对空气中的杂质进行过滤，避免杂质进入被测阀内加剧被测阀的磨损，保证被测阀寿命检测的可靠性。By adopting the above technical solution, when the oil in the fuel tank is reduced and the air enters the fuel tank, the air filter filters the impurities in the air to prevent impurities from entering the valve under test and aggravate the wear of the valve under test, ensuring the valve under test. Reliability of life testing.
综上所述，本发明具有以下有益效果：To sum up, the present invention has the following beneficial effects:
通过设置两套液压动力源系统和两组测试回路，测试回路中的每个被测阀的A口和B口均连接有压力传感器，且每个被测阀的A口和B口之间都连接有测试阻尼装置。每个被测阀经过测试阻尼装置的缓冲作用后的A口及B口的压力经过对应的压力传感器反馈压力信号，经记录器后记录压力变动波形和变动数，通过压力变动波形和变动数来判断被测阀的使用寿命和可靠性，其通用化强、抗污染能力强、可靠性高。By setting two sets of hydraulic power source systems and two sets of test circuits, pressure sensors are connected to ports A and B of each valve under test in the test circuit, and there is a pressure sensor between ports A and B of each valve under test. A test damping device is connected. The pressure of port A and port B of each valve under test after the buffering effect of the damping device is tested, and the pressure signal is fed back through the corresponding pressure sensor, and the pressure fluctuation waveform and number of fluctuations are recorded after the recorder. Judging the service life and reliability of the valve under test, it has strong generalization, strong anti-pollution ability and high reliability.
附图说明Description of drawings
图1是一种电磁换向阀寿命可靠性测试液压系统的原理图；Figure 1 is a schematic diagram of the hydraulic system for the reliability test of the life of an electromagnetic directional valve;
图2是一种电磁换向阀寿命可靠性测试液压系统中液压动力源系统的原理图；Figure 2 is a schematic diagram of a hydraulic power source system in a hydraulic system for reliability testing of electromagnetic directional valve life;
图3是一种电磁换向阀寿命可靠性测试液压系统中测试回路的原理图；Figure 3 is a schematic diagram of a test circuit in a hydraulic system for reliability testing of electromagnetic directional valve life;
图4是一种电磁换向阀寿命可靠性测试液压系统中隔板的结构示意图。FIG. 4 is a schematic diagram of the structure of a diaphragm in a hydraulic system for testing the reliability of life of an electromagnetic directional valve.
图中，1、测试回路；11、被测阀；12、压力传感器；13、测试阻尼装置；2、液压动力源系统；21、蝶阀；22、避振喉；23、高压泵；24、电机；25、单向阀；26、调压阀组；27、高压过滤器；28、蓄能器；29、压力感应器；3、进油球阀组；31、进油球阀Ⅰ；32、进油球阀Ⅱ；33、进油球阀Ⅲ；34、进油球阀Ⅳ；35、进油球阀Ⅴ；4、双路背压阀组；5、回油球阀组；51、回油球阀Ⅰ；52、回油球阀Ⅱ；53、回油球阀Ⅲ；54、回油球阀Ⅳ；6、油箱；61、吸油区；62、回油区；63、磁铁；7、隔板；71、滤网；8、电加热器；81、温度控制器；9、液位控制器；91、液位计；10、油冷机；101、回油过滤器；102、空气滤清器。In the figure, 1, test circuit; 11, tested valve; 12, pressure sensor; 13, test damping device; 2, hydraulic power source system; 21, butterfly valve; 22, anti-vibration throat; 23, high pressure pump; 24, motor ;25, check valve; 26, pressure regulating valve group; 27, high pressure filter; 28, accumulator; 29, pressure sensor; 3, oil inlet ball valve group; 31, oil inlet ball valve I; 32, oil inlet Ball valve II; 33, oil inlet ball valve III; 34, oil inlet ball valve IV; 35, oil inlet ball valve V; 4, dual back pressure valve group; 5, oil return ball valve group; 51, oil return ball valve I; 52, return Oil ball valve II; 53, oil return ball valve III; 54, oil return ball valve IV; 6, oil tank; 61, oil suction area; 62, oil return area; 63, magnet; 7, separator; 71, filter screen; 8, electric Heater; 81, temperature controller; 9, liquid level controller; 91, liquid level gauge; 10, oil cooler; 101, oil return filter; 102, air filter.
具体实施方式Detailed ways
以下结合附图和实施例，对本发明进行进一步详细说明。应当理解，此处所描述的具体实施例仅用以解释本发明，并不用于限定本发明。The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.
一种电磁换向阀寿命可靠性测试液压系统，如图1所示，包括两组并联的测试回路1和两套并联且共用一个油箱6的液压动力源系统2。如图1或图2所示，油箱6内设有隔板7，隔板7将油箱6分为吸油区61和回油区62，两套液压动力源系统2均与油箱6的吸油区61连通。两套液压动力源系统2和两组测试回路1之间设有进油球阀组3，通过切换进油球阀组3的不同状态，两套液压动力源系统2和两组测试回路1之间可以排布三种供油形式。A hydraulic system for testing the reliability of electromagnetic directional valve life, as shown in FIG. 1 , includes two sets of parallel test circuits 1 and two sets of parallel hydraulic
如图1和图3所示，每组测试回路1包括N个并联的被测阀11，每个被测阀11包括A口、B口、P口和T口，被测阀11的P口连接液压动力源系统2，被测阀11的T口连接油箱6的回油区62。如图1和图3所示，每个被测阀11的A口和B口分别连接有压力传感器12，每个被测阀11的A口和B口之间还连接有位于两个压力传感器12之间的测试阻尼装置13。每个压力传感器12监测与其连接的被测阀11的A口或B口的压力，每个压力传感器12的反馈压力信号经记录器后记录压力变动波形和变动数，通过压力变动波形和变动数来判断被测阀11的使用寿命和可靠性。在本实施例中，每组测试回路1均包括8个并联的被测阀11，且被测阀11为电磁换向阀。As shown in FIG. 1 and FIG. 3 , each group of test circuits 1 includes N paralleled
如图1和图2所示，每套液压动力源系统2均包括高压泵23、电机24、双路背压阀组4，电机24电连接高压泵23，高压泵23可手动调节输出流量的大小。高压泵23的吸油口和油箱6之间连接有蝶阀21和避振喉22，蝶阀21位于油箱6的吸油区61内与油箱6连接，避振喉22位于高压泵23和蝶阀21之间，起到减振作用。如图1和图2所示，高压泵23的出油口连接有单向阀25，单向阀25的出油口连接有调压阀组26，而调压阀组26的出油口连接有高压过滤器27，调压阀组26对供到测试回路1的油液进行调压，而高压过滤器27对油液进行过滤。如图1和图2所示，双路背压阀组4的出油口连接于油箱6的回油区62，而两组测试回路1和双路背压阀组4之间设有回油球阀组5，通过切换回油球阀组5的不同状态，两组测试回路1可以排布三种回油方式。As shown in FIG. 1 and FIG. 2 , each hydraulic
如图3所示，在本实施例中，进油球阀组3包括进油球阀Ⅰ31、进油球阀Ⅱ32、进油球阀Ⅲ33、进油球阀Ⅳ34、以及进油球阀Ⅴ35，进油球阀Ⅰ31、进油球阀Ⅱ32分别连接在每组高压过滤器27的出油口处，进油球阀Ⅲ33、进油球阀Ⅳ34分别设置在每组测试回路1中与液压动力源系统2连接的第一个被测阀11的进油口处，进油球阀Ⅴ35设置在进油球阀Ⅰ31、进油球阀Ⅱ32、进油球阀Ⅲ33、进油球阀Ⅳ34之间。油液可从进油球阀Ⅰ31到进油球阀Ⅲ33，从进油球阀Ⅱ32到进油球阀Ⅳ34；也可从进油球阀Ⅰ31到进油球阀Ⅴ35再到进油球阀Ⅳ34；还可从进油球阀Ⅱ32到进油球阀Ⅴ35再到进油球阀Ⅲ33。As shown in Figure 3, in this embodiment, the oil inlet
如图2所示，在本实施例中，回油球阀组5包括回油球阀Ⅰ51、回油球阀Ⅱ52、回油球阀Ⅲ53以及回油球阀Ⅳ54，回油球阀Ⅰ51、回油球阀Ⅱ52分别连接在双路背压阀组4中的两个背压阀上，回油球阀Ⅲ53设置在回油球阀Ⅰ51、回油球阀Ⅱ52之间，回油球阀Ⅳ54与双路背压球阀组并联，直接连接于油箱6的回油区62。其中一组测试回路1的油液可直接从回油球阀Ⅳ54流回油箱6，也可从回油球阀Ⅰ51经过其中一个背压阀流回油箱6，还可从回油球阀Ⅲ53到回油球阀Ⅱ52再经过另一背压阀流回油箱6。另一组测试回路1的油液可直接经过回油球阀Ⅱ52到一背压阀流回油箱6，也可经过回油球阀Ⅲ53到回油球阀Ⅰ51经过另一背压阀流回油箱6，还可经过回油球阀Ⅲ53到回油球阀Ⅳ54后直接流回油箱6。As shown in Figure 2, in this embodiment, the oil return
如图2或图3所示，其中，在进油球阀Ⅲ33、进油球阀Ⅳ34的出油口处分别连接有一个蓄能器28，且蓄能器28与该组测试单元中每个被测阀11的P口都连接，在每个蓄能器28和与其连接的第一个被测阀11的P口之间均设有压力感应器29，压力感应器29用于检测进入每个被测阀11的P口的油液压力，以便调压阀组26进行调压。在本实施例中，调压阀组26以及双路背压阀组4均为连接减压阀的电磁溢流阀。每个压力感应器29和压力传感器12可以选择自带数显仪的，也可单独再连接压力表，本实施例中选择自带数显仪。As shown in FIG. 2 or FIG. 3 , an
如图2所示，在油箱6内还设有温度控制器81、电加热器8、液位计91、液位控制器9，温度控制器81、电加热器8以及液位控制器9位于油箱6的吸油区61内，液位计91位于油箱6的回油区62，液位计91和液位控制器9配合，保证油箱6内油液充足，保证测试回路1的正常测试工作。如图2所示，在每个蓄能器28和对应的压力感应器29之间也设有与电加热器8通信控制连接的温度控制器81，三个温度控制器81和电加热器8配合使用，保证油液的温度正常，可满足测试回路1的使用需求。As shown in FIG. 2, a
如图2所示，除此之外，在油箱6的回油区62还连接有油冷机10，油冷机10的出口连接有回油过滤器101，回油过滤器101的出油口与油箱6的回油区62连接。回油过滤器101在测试过程中与油冷机10一起，对油箱6中的油液进行温度变化区间控制和油液污染过滤。如图2和图4所示，而在油箱6的回油区62还连接有空气滤清器102，在隔板7上还设有滤网71，在油箱6吸油区61底部还设有用于吸附油液在循环过程中携带的金属杂质的磁铁63，这样来进一步保证油液的清洁，保证测试工作的正常进行。As shown in FIG. 2 , in addition, an
以上各部件油路的连通均通过管道连接实现，上述未作过多赘述。The communication of the oil circuits of the above components is realized by pipeline connection, and the above will not be described in detail.
本发明的工作原理和使用方法：The working principle and using method of the present invention:
如图1所示，两组液压动力源系统2为两组测试回路1提供油液，根据需要切换进油球阀组3和回油球阀组5的通断情况来实现三种不同供油形式的选择。经过调压阀组26的调压、高压过滤器27的过滤的油液从进油球阀组3进入每个被测阀11的P口，从每个被测阀11的T口经过回油球阀组5和双路背压阀组4回到油箱6，每个被测阀11经过测试阻尼装置13的缓冲作用后的A口及B口的压力经过对应的压力传感器12反馈压力信号，经记录器后记录压力变动波形和变动数，通过压力变动波形和变动数来判断被测阀11的使用寿命和可靠性，其通用化强、抗污染能力强、可靠性高。As shown in Figure 1, two sets of hydraulic
上述说明示出并描述了本发明的优选实施例，如前所述，应当理解本发明并非局限于本文所披露的形式，不应看作是对其他实施例的排除，而可用于各种其他组合、修改和环境，并能够在本文所述发明构想范围内，通过上述教导或相关领域的技术或知识进行改动。而本领域人员所进行的改动和变化不脱离本发明的精神和范围，则都应在本发明所附权利要求的保护范围内。The foregoing specification illustrates and describes preferred embodiments of the present invention, and as previously stated, it should be understood that the present invention is not limited to the form disclosed herein, and should not be construed as an exclusion of other embodiments, but may be used in a variety of other Combinations, modifications and environments are possible within the scope of the inventive concepts described herein, from the above teachings or from skill or knowledge in the relevant fields. However, modifications and changes made by those skilled in the art do not depart from the spirit and scope of the present invention, and should all fall within the protection scope of the appended claims of the present invention.
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