Heavy-pressure lower withdrawal and straightening machine of billet continuous casting machine, hydraulic control system of withdrawal and straightening machine and control methodTechnical Field
The invention relates to the field of metallurgical equipment, in particular to a heavy-pressure lower withdrawal and straightening machine of a billet continuous casting machine, a hydraulic control system of the withdrawal and straightening machine and a control method.
Background
The continuous casting machine for the square billets has the advantages that the internal center segregation, the center porosity and the internal quality of shrinkage cavities are commonly caused, so that certain quality defects of the continuous casting billets are caused, the continuous casting machine soft reduction technology can effectively solve the problem of the internal center segregation of the continuous casting billets, but the continuous casting machine soft reduction technology has little effect on the problems of the internal porosity and the shrinkage cavities of the continuous casting billets. In order to solve the problems of loose and shrinkage cavity inside the continuous casting blank, the continuous casting production process under heavy pressure is provided, wherein the continuous casting process is high in quality and high in production efficiency.
The withdrawal and straightening machine of the billet continuous casting machine is controlled by 1 withdrawal and straightening machine hydraulic cylinder to realize the heavy pressing function, and because the heavy pressing process requires the maximum rolling reduction of a single roller to be about 20 mm and casting blanks at the heavy pressing position are solidified, the rolling reduction force of the withdrawal and straightening machine is very large, so that the specification of the withdrawal and straightening machine hydraulic cylinder required by equipment is also large, the size of the withdrawal and straightening machine equipment is increased, and meanwhile, the casting blanks in the heavy pressing process are easily caused to deviate by 1 withdrawal and straightening machine hydraulic cylinder. The invention provides a hydraulic control system comprising 1 balance cylinder and 2 tension leveler servo hydraulic cylinders.
Disclosure of Invention
The invention overcomes the defects of the prior art, and provides a withdrawal and straightening machine under the heavy pressure of a square billet continuous casting machine, a hydraulic control system and a control method of the withdrawal and straightening machine, in particular to the method which can realize the accurate control of the roll gap in the heavy pressure process of the withdrawal and straightening machine, prevent casting blanks from deviating, prevent the servo hydraulic cylinder of the withdrawal and straightening machine from bearing lateral force, and ensure the reliability and long service life of the servo hydraulic cylinder of the withdrawal and straightening machine.
The technical problems solved by the invention can be realized by adopting the following technical scheme:
The heavy-pressure lower withdrawal and straightening machine of the billet continuous casting machine at least comprises a withdrawal and straightening machine frame, wherein the top of the inner side of the withdrawal and straightening machine frame is connected with a hydraulic control system of the heavy-pressure lower withdrawal and straightening machine of the billet continuous casting machine, the bottom of the inner side of the withdrawal and straightening machine frame is connected with two lower withdrawal and straightening machine roll bearing seats, a lower withdrawal and straightening machine roll is connected between the two lower withdrawal and straightening machine roll bearing seats, the top of the lower withdrawal and straightening machine roll is connected with an upper withdrawal and straightening machine roll through a casting blank, the upper withdrawal and straightening machine roll is connected with the middle position of the inner side of the withdrawal and straightening machine frame through the two upper withdrawal and straightening machine roll bearing seats, the upper withdrawal and straightening machine roll is controlled by the hydraulic control system of the heavy-pressure lower withdrawal and straightening machine of the billet continuous casting machine, the tops of the two upper withdrawal and straightening machine roll bearing seats are connected through a cross beam, the two upper withdrawal and straightening machine roll bearing seats are fixed on the withdrawal and straightening machine frame through bolts, and one end of the upper withdrawal and straightening machine roll is also connected with a withdrawal and straightening machine transmission mechanism.
The hydraulic control system of the heavy-pressure lower withdrawal and straightening machine of the square billet continuous casting machine comprises a proportional direction valve, a withdrawal and straightening machine servo hydraulic cylinder, a three-way pressure reducing valve, a balance cylinder, a leather bag type energy accumulator and a PLC control unit, wherein the tail part of the withdrawal and straightening machine servo hydraulic cylinder is connected to the top of the inner side of a withdrawal and straightening machine frame through a flange, the end part of a piston rod of the withdrawal and straightening machine servo hydraulic cylinder is mushroom head-shaped, the end part of the piston rod of the withdrawal and straightening machine servo hydraulic cylinder is contacted with the top of a roller bearing seat of the withdrawal and straightening machine through a mushroom head, one end of the balance cylinder is hinged to the top of the inner side of the withdrawal and straightening machine frame, the other end of the balance cylinder is hinged to the middle part of a cross beam between the tops of the roller bearing seats of the two withdrawal and straightening machines, one ends of the proportional direction valve and the three-way pressure reducing valve are both communicated with a hydraulic system pressure supply port P and a hydraulic system oil return port T of the hydraulic system through oil pipelines, the other ends of the proportional direction valve are connected with the withdrawal and straightening machine servo hydraulic cylinder through oil pipelines, the other ends of the three-way pressure reducing valve are also connected with the balance cylinder and the leather bag type energy accumulator through the oil pipelines, one ends of the three-way pressure reducing valve are also communicated with the hydraulic system leakage port L through the oil pipelines, and the control unit is used for controlling the withdrawal and straightening machine hydraulic pressure.
The automatic tension leveler is characterized in that two groups of proportional direction valves and tension leveler servo hydraulic cylinders are arranged, each proportional direction valve comprises a first proportional direction valve and a second proportional direction valve, each tension leveler servo hydraulic cylinder comprises a first tension leveler servo hydraulic cylinder and a second tension leveler servo hydraulic cylinder, the tail parts of the first tension leveler servo hydraulic cylinders and the tail parts of the second tension leveler servo hydraulic cylinders are connected to the top of the inner side of the tension leveler frame through flanges, the piston rod end parts of the first tension leveler servo hydraulic cylinders and the piston rod end parts of the second tension leveler servo hydraulic cylinders are mushroom head type, the piston rod end parts of the first tension leveler servo hydraulic cylinders and the piston rod end parts of the second tension leveler servo hydraulic cylinders are in contact with the top parts of roller bearing seats on two tension levelers through mushroom heads, one ends of the first proportional direction valves and the second proportional direction valves are communicated with a hydraulic system pressure supply port P and a hydraulic system oil return port T of a hydraulic system through oil pipelines respectively, and the other ends of the first proportional direction valves are communicated with the first tension leveler servo hydraulic cylinders through oil pipelines.
The oil pipeline of the first proportional direction valve communicated with the first tension leveler servo hydraulic cylinder and the oil pipeline of the second proportional direction valve communicated with the second tension leveler servo hydraulic cylinder are respectively connected with a pressure sensor, and displacement sensors are arranged in the tension leveler servo hydraulic cylinder and the second tension leveler servo hydraulic cylinder.
The pressure sensor comprises a first pressure sensor, a second pressure sensor, a third pressure sensor and a fourth pressure sensor, wherein the first pressure sensor and the second pressure sensor are connected to an oil pipeline which is communicated with a first tension leveler servo hydraulic cylinder through a first proportional direction valve, the third pressure sensor and the fourth pressure sensor are connected to an oil pipeline which is communicated with a second tension leveler servo hydraulic cylinder through a second proportional direction valve, the displacement sensor comprises a first displacement sensor and a second displacement sensor, the first displacement sensor is connected to the first tension leveler servo hydraulic cylinder, and the second displacement sensor is connected to the second tension leveler servo hydraulic cylinder.
The transmission mechanism of the tension leveler consists of a motor and a speed reducer.
The hydraulic control method of the heavy-pressure lower withdrawal and straightening machine of the billet continuous casting machine comprises the hydraulic control system of the heavy-pressure lower withdrawal and straightening machine of the billet continuous casting machine, and comprises the following steps:
the method comprises the steps that a transmission device of a withdrawal and straightening machine drives an upper roller of the withdrawal and straightening machine to rotate between two upper roller bearing seats of the withdrawal and straightening machine, and simultaneously drives a lower roller of the withdrawal and straightening machine to rotate between two lower roller bearing seats of the withdrawal and straightening machine through a casting blank;
step two, the upper roller of the withdrawal and straightening machine controls a servo hydraulic cylinder of the first withdrawal and straightening machine, a servo hydraulic cylinder of the second withdrawal and straightening machine and a balance cylinder through a PLC control unit in a hydraulic control system of the withdrawal and straightening machine under the heavy pressure of the square billet continuous casting machine so as to control the roller gap position formed by the upper roller of the withdrawal and straightening machine and the lower roller of the withdrawal and straightening machine;
The balance cylinder rod cavity is communicated with pressure oil P1 decompressed by a three-way pressure reducing valve, a leather bag type energy accumulator is arranged behind the three-way pressure reducing valve to stabilize the decompression pressure, and a pull-straightening machine upper roller bearing seat of an upper roller of a pull-straightening machine is always tightly contacted with piston rod mushroom heads of a first pull-straightening machine servo hydraulic cylinder and a second pull-straightening machine servo hydraulic cylinder by adjusting the P1 pressure, so that deflection of the pull-straightening machine upper roller caused by a pull-straightening machine transmission mechanism is prevented, and lateral force bearing of the first pull-straightening machine servo hydraulic cylinder and the second pull-straightening machine servo hydraulic cylinder is prevented;
And fourthly, controlling pressure by a first pressure sensor, a second pressure sensor, a third pressure sensor and a fourth pressure sensor which are respectively connected with a plug cavity and a rod cavity of the first tension leveler servo hydraulic cylinder and the second tension leveler servo hydraulic cylinder, wherein the first displacement sensor and the second displacement sensor in the first tension leveler servo hydraulic cylinder and the second tension leveler servo hydraulic cylinder are used for monitoring the positions of the telescopic rods in the first tension leveler servo hydraulic cylinder and the second tension leveler servo hydraulic cylinder.
The beneficial effects of the invention are as follows:
Compared with the prior art, the invention adopts 2 proportional directional valves to control 2 tension leveler servo hydraulic cylinders through the heavy-pressure tension leveler, and realizes displacement compensation of equipment clearance and equipment elastic deformation through a displacement sensor, and finally realizes accurate control of roll gap positions formed by an upper roll and a lower roll of the tension leveler, a balance cylinder rod cavity is communicated with pressure oil P1 decompressed through a three-way pressure reducing valve, and is provided with a bellows type energy accumulator for stabilizing decompression pressure, and through adjusting proper P1 pressure, a bearing seat of the upper roll of the tension leveler is always tightly contacted with a piston rod mushroom head of the tension leveler servo hydraulic cylinder, deflection of the upper roll of the tension leveler caused by dead weight of a transmission mechanism of the tension leveler can be prevented, the servo hydraulic cylinder of the tension leveler can be prevented from bearing lateral force, reliability and service life of the tension leveler hydraulic cylinder are improved, and displacement compensation of equipment clearance and equipment elastic deformation is realized through the pressure sensor, and finally accurate control of roll gap positions formed by the upper roll and the lower roll of the tension leveler is realized.
Drawings
The invention will be further described with reference to the drawings and examples.
FIG. 1 is a schematic diagram of a withdrawal and straightening machine according to the present invention.
Fig. 2 is a schematic diagram of a hydraulic principle implemented by the hydraulic control system of the heavy-pressure lower withdrawal and straightening machine of the billet continuous casting machine.
In the drawing, a 1.1-first proportional direction valve, a 1.2-second proportional direction valve, a 2.1-first withdrawal and straightening machine servo hydraulic cylinder, a 2.2-second withdrawal and straightening machine servo hydraulic cylinder, a 3.1-first displacement sensor, a 3.2-second displacement sensor, a 4.1-first pressure sensor, a 4.2-second pressure sensor, a 4.3-third pressure sensor, a 4.4-fourth pressure sensor, a 5.1-three-way pressure reducing valve, a 6.1-balance cylinder, a 7.1-bag type energy accumulator, an 8.1-withdrawal and straightening machine upper roller, a 9.1-withdrawal and straightening machine upper roller bearing seat, a 10.1-withdrawal and straightening machine transmission device, 11.1-casting blanks, a 12.1-withdrawal and straightening machine lower roller, a 13.1-withdrawal and straightening machine lower roller bearing seat, a P hydraulic system pressure supply oil port, a T hydraulic system oil return port, an L hydraulic system leakage port and a pressure after the P1 is depressurized by the three-way pressure reducing valve.
Detailed Description
Example 1:
Referring to fig. 1, a schematic structural diagram of embodiment 1 of the present invention is a heavy-pressure lower withdrawal and straightening machine of a billet continuous casting machine, at least comprising a withdrawal and straightening machine frame, wherein the top of the inner side of the withdrawal and straightening machine frame is connected with a hydraulic control system of the heavy-pressure lower withdrawal and straightening machine of the billet continuous casting machine, the bottom of the inner side of the withdrawal and straightening machine frame is connected with two lower withdrawal and straightening machine roller bearing seats 13.1, a lower withdrawal and straightening machine roller 12.1 is connected between the two lower withdrawal and straightening machine roller bearing seats 13.1, the top of the lower withdrawal and straightening machine roller 12.1 is connected with an upper withdrawal and straightening machine roller 8.1 through a casting blank 11.1, the upper withdrawal and straightening machine roller 8.1 is connected with a middle position of the inner side of the withdrawal and straightening machine frame through two upper withdrawal and straightening machine roller bearing seats 9.1, the upper withdrawal and straightening machine roller 8.1 is controlled by the hydraulic control system of the heavy-pressure lower withdrawal and straightening machine, the tops of the two upper withdrawal and straightening machine roller bearing seats 9.1 are also connected through a cross beam, the two upper withdrawal and straightening machine roller bearing seats 9.1 are fixed on the withdrawal and straightening machine frame through bolts, and the upper withdrawal and straightening machine roller 8.1 is connected with one end of the withdrawal and straightening machine 10.
The further tension leveler transmission mechanism 10.1 consists of a motor and a speed reducer.
When the device is in actual use, the lifting and pressing functions of the upper rollers 8.1 of the heavy-pressure lower withdrawal and straightening machine are controlled by the hydraulic control system of the square billet continuous casting machine, the motor and the speed reducer in the transmission mechanism 10.1 of the withdrawal and straightening machine are used for driving the upper rollers 8.1 of the withdrawal and straightening machine to rotate between the upper roller bearing seats 9.1 of the two withdrawal and straightening machines, and the lower rollers 12.1 of the withdrawal and straightening machine are driven to rotate between the lower roller bearing seats 13.1 of the two withdrawal and straightening machines while the upper rollers 8.1 of the withdrawal and straightening machine rotate, and in the working process of the heavy-pressure lower withdrawal and straightening machine, the roll gap value is remotely set by the PLC control unit, and the hydraulic control system of the heavy-pressure lower withdrawal and straightening machine of the square billet continuous casting machine is used for realizing the accurate roll gap control requirement.
Example 2:
Referring to FIG. 2, compared with the embodiment 1, the hydraulic control system of the heavy-pressure lower withdrawal and straightening machine of the billet continuous casting machine is different in that the hydraulic control system of the heavy-pressure lower withdrawal and straightening machine of the billet continuous casting machine comprises a proportional direction valve, a withdrawal and straightening machine servo hydraulic cylinder, a three-way pressure reducing valve 5.1, a balance cylinder 6.1, a leather bag type energy accumulator 7.1 and a PLC control unit, wherein the tail part of the withdrawal and straightening machine servo hydraulic cylinder is connected to the top of the inner side of the withdrawal and straightening machine frame through a flange, the end part of a piston rod of the withdrawal and straightening machine servo hydraulic cylinder is mushroom head type, the end part of the piston rod of the withdrawal and straightening machine servo hydraulic cylinder is contacted with the top of a roll bearing 9.1 on the withdrawal and straightening machine through the mushroom head, one end of the balance cylinder 6.1 is hinged with the top of the inner side of the withdrawal and the middle part of a cross beam between the other end of the balance cylinder 6.1 and the top of the roll bearing 9.1 on the two withdrawal and straightening machines, one end of the proportional direction valve and the three-way pressure reducing valve 5.1 are communicated with an oil supply port P of a hydraulic system through an oil pipeline and an oil return port T of the hydraulic system, the other end of the proportional direction valve is communicated with the other end of the withdrawal and straightening machine servo cylinder through the oil pipeline and the pressure reducing valve 5.1 is communicated with the hydraulic system through the oil supply port P and the hydraulic system of the hydraulic system, and the pressure reducing port of the pressure reducing valve 1.
Further, two groups of proportional direction valves and a tension leveler servo hydraulic cylinder are arranged, each proportional direction valve comprises a first proportional direction valve 1.1 and a second proportional direction valve 1.2, each tension leveler servo hydraulic cylinder comprises a first tension leveler servo hydraulic cylinder 2.1 and a second tension leveler servo hydraulic cylinder 2.2, the tail parts of the first tension leveler servo hydraulic cylinders 2.1 and the second tension leveler servo hydraulic cylinders 2.2 are connected to the top of the inner side of a tension leveler frame through flanges, the piston rod ends of the first tension leveler servo hydraulic cylinders 2.1 and the second tension leveler servo hydraulic cylinders 2.2 are mushroom head type, the piston rod ends of the first tension leveler servo hydraulic cylinders 2.1 and the second tension leveler servo hydraulic cylinders 2.2 are in contact with the top of a roll bearing seat 9.1 on two tension levelers through mushroom heads, one ends of the first proportional direction valves 1.1 and the second proportional direction valves 1.2 are respectively communicated with a hydraulic system pressure supply port P and an oil return port T of a hydraulic system through oil and an oil pipeline, and the other ends of the first tension leveler servo cylinders 1.1 and the second tension leveler servo cylinders are communicated with the other ends of the first tension leveler servo cylinders through mushroom heads and the second proportional direction valves 2.2.2.
Further, the oil pipeline of the first proportional directional valve 1.1 communicated with the first tension leveler servo hydraulic cylinder 2.1 and the oil pipeline of the second proportional directional valve 1.2 communicated with the second tension leveler servo hydraulic cylinder 2.2 are respectively connected with a pressure sensor, and displacement sensors are respectively arranged in the tension leveler servo hydraulic cylinder 2.1 and the second tension leveler servo hydraulic cylinder 2.2.
The further pressure sensor comprises a first pressure sensor 4.1, a second pressure sensor 4.2, a third pressure sensor 4.3 and a fourth pressure sensor 4.4, wherein the first pressure sensor 4.1 and the second pressure sensor 4.2 are connected to an oil pipeline of the first proportional directional valve 1.1 communicated with the first tension leveler servo hydraulic cylinder 2.1, the third pressure sensor 4.3 and the fourth pressure sensor 4.4 are connected to an oil pipeline of the second proportional directional valve 1.2 communicated with the second tension leveler servo hydraulic cylinder 2.2, the displacement sensor comprises a first displacement sensor 3.1 and a second displacement sensor 3.2, the first displacement sensor 3.1 is connected to the first tension leveler servo hydraulic cylinder 2.1, and the second displacement sensor 3.2 is connected to the second tension leveler servo hydraulic cylinder 2.2.
Further, the first proportional directional valve 1.1 and the second proportional directional valve 1.2 respectively comprise an oil port P, an oil port T, an oil port a and an oil port B, the oil ports P of the first proportional directional valve 1.1 and the second proportional directional valve 1.2 respectively communicate with a hydraulic system oil supply port P of a hydraulic system through an oil pipeline, the oil ports T of the first proportional directional valve 1.1 and the second proportional directional valve 1.2 respectively communicate with an oil return port T of the hydraulic system through an oil pipeline, the oil port a of the first proportional directional valve 1.1 communicates with an oil inlet of a first tension leveler servo hydraulic cylinder 2.1 through an oil pipeline, the oil port B of the first proportional directional valve 1.1 communicates with an oil outlet of the first tension leveler servo hydraulic cylinder 2.1 through an oil pipeline, the oil port a second proportional directional valve 1.2 communicates with an oil outlet of the second tension leveler servo cylinder 2.2 through an oil pipeline, the first proportional directional valve 1.1.2 connects with a pressure sensor on the first tension leveler servo cylinder 2.1.1 and the oil port of the first tension leveler servo cylinder 2.1, the three-way valve 1.1.1 is connected with a pressure sensor 2.2, the three-way valve 2.1.1 is connected with the oil port of the first tension leveler servo cylinder 2.1 through a pressure sensor on the first pressure conduit, the first proportional valve 2.1 is connected with the oil port 2.2, the oil return port T of the three-way pressure reducing valve 5.1 is communicated with the oil return port T of the hydraulic system through an oil pipeline, the oil leakage port L of the three-way pressure reducing valve 5.1 is communicated with the oil leakage port L of the hydraulic system through an oil pipeline, and the oil outlet of the three-way pressure reducing valve 5.1 is communicated with the balance cylinder 6.1 and the leather bag type energy accumulator 7.1 through an oil pipeline.
The heavy-pressure withdrawal and straightening machine adopts 2 proportional directional valves, namely a first proportional directional valve 1.1 and a second proportional directional valve 1.2, to control the output force of 2 withdrawal and straightening machine servo hydraulic cylinders, namely a first withdrawal and straightening machine servo hydraulic cylinder 2.1 and a second withdrawal and straightening machine servo hydraulic cylinder 2.2, and forms a position closed loop through a first displacement sensor 3.1 and a second displacement sensor 3.2 in the first withdrawal and straightening machine servo hydraulic cylinder 2.1 and the second withdrawal and straightening machine servo hydraulic cylinder 2.2, and finally realizes accurate control of the roll position formed by a pressure reducing and balancing device 8.1 and a withdrawal and straightening machine lower roll 12.1 through the difference of the output force of a computer, namely, a heavy-pressure balancing device 6.1 is connected with a pressure reducing device through a pressure reducing valve 5, and a pressure reducing device 6.1 through a pressure reducing valve, and a pressure setting device is used for the pressure reducing device, and is always in contact with a three-way, and is used for controlling the pressure of the pressure reducing device through the pressure reducing device 2, and the pressure of the pressure reducing device is required to be in a process of setting a three-way, and the pressure valve 2, and the pressure of the pressure reducing device is required to be in a small-dimensional control unit is required to be in a process of setting a pressure reducing device through the pressure reducing valve 2, and a pressure reducing device is required to be in a pressure reducing device through the pressure reducing device.
Example 3:
The hydraulic control method of the heavy-pressure lower withdrawal and straightening machine of the billet continuous casting machine comprises the hydraulic control system of the heavy-pressure lower withdrawal and straightening machine of the billet continuous casting machine, which is disclosed in the embodiment 2, and comprises the following steps:
the first step, a tension leveler transmission device 10.1 drives a tension leveler upper roller 8.1 to rotate between two tension leveler upper roller bearing blocks 9.1, and a tension leveler lower roller 12.1 is driven to rotate between two tension leveler lower roller bearing blocks 13.1 through a casting blank 11.1 while the tension leveler upper roller 8.1 rotates;
Step two, the upper roller 8.1 of the withdrawal and straightening machine controls a first withdrawal and straightening machine servo hydraulic cylinder 2.1, a second withdrawal and straightening machine servo hydraulic cylinder 2.2 and a balance cylinder 6.1 through a PLC control unit in a hydraulic control system of the withdrawal and straightening machine under the heavy pressure of the square billet continuous casting machine so as to control the roller gap position formed by the upper roller 8.1 of the withdrawal and straightening machine and the lower roller 12.1 of the withdrawal and straightening machine;
The third step, a rod cavity of a balance cylinder 6.1 is communicated with pressure oil P1 decompressed by a three-way pressure reducing valve 5.1, a leather bag type energy accumulator 7.1 is arranged behind the three-way pressure reducing valve to stabilize the pressure reduction, a tension leveler upper roller bearing seat 9.1 of a tension leveler upper roller 8.1 is always tightly contacted with piston rod mushroom heads of a first tension leveler servo hydraulic cylinder 2.1 and a second tension leveler servo hydraulic cylinder 2.2 by adjusting the pressure P1, deflection of the tension leveler upper roller 8.1 caused by a tension leveler transmission mechanism 10.1 is prevented, and lateral bearing forces of the first tension leveler servo hydraulic cylinder 2.1 and the second tension leveler servo hydraulic cylinder 2.2 are prevented;
and fourthly, controlling pressure through a first pressure sensor 4.1, a second pressure sensor 4.2, a third pressure sensor 4.3 and a fourth pressure sensor 4.4 which are respectively connected with a plug cavity and a rod cavity of the first tension leveler servo hydraulic cylinder 2.1 and the second tension leveler servo hydraulic cylinder 2.2, wherein a first displacement sensor 3.1 and a second displacement sensor 3.2 in the first tension leveler servo hydraulic cylinder 2.1 and the second tension leveler servo hydraulic cylinder 2.2 are used for monitoring the positions of telescopic rods in the first tension leveler servo hydraulic cylinder 2.1 and the second tension leveler servo hydraulic cylinder 2.2.
According to the heavy-pressure withdrawal and straightening machine, 2 proportional directional valves are adopted to control 2 withdrawal and straightening machine servo hydraulic cylinders, a position closed loop is formed through a displacement sensor, displacement compensation of equipment clearance and equipment elastic deformation is achieved through a pressure sensor, accurate control of a roll gap position formed by an upper roll and a lower roll of the withdrawal and straightening machine is finally achieved, a rod cavity of a balance cylinder 6.1 is communicated with pressure oil P1 depressurized through a three-way pressure reducing valve 5.1, a bag type energy accumulator 7.1 is arranged to stabilize the depressurization pressure, a bearing seat of the upper roll of the withdrawal and straightening machine is always tightly contacted with a piston rod mushroom head of the servo hydraulic cylinder of the withdrawal and straightening machine through adjusting proper P1 pressure, deflection of the upper roll of the withdrawal and straightening machine caused by dead weight of a transmission mechanism of the withdrawal and straightening machine servo hydraulic cylinders can be prevented from bearing lateral force, reliability and service life of the hydraulic cylinder of the withdrawal and straightening machine are improved.
The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the scope of the knowledge of those skilled in the art without departing from the spirit of the present invention, which is within the scope of the present invention.
It should be noted that all directional indications such as up, down, left, right, front, rear are used in the embodiments of the present invention) are merely for explaining the relative positional relationship, movement conditions, etc. between the components in a certain specific posture as shown in the drawings), and if the specific posture is changed, the directional indication is changed accordingly.
The technical solutions between the embodiments may be combined with each other, but it is necessary to base the implementation on the basis of those skilled in the art that when the combination of technical solutions contradicts or cannot be implemented, it should be considered that the combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.