An electro-hydraulic servo actuator for resisting lateral force

Abstract

A lateral force resistant electro-hydraulic servo actuator relates to the technical field of actuators for servo loading tests. The application includes an lateral force resistant device, one side of which is connected to a spherical bearing through a tension pressure sensor, and the other side is connected to an electro-hydraulic servo valve through a servo actuator, and the electro-hydraulic servo valve is connected to a displacement sensor. The application achieves the purpose of solving the rigid connection shortcomings of the existing servo actuator flange connection, improving the wear and oil leakage of the servo actuator, reducing piston rod damage, and extending the service life.

Description

Technical Field

[0001] The present application relates to the technical field of actuators for servo loading tests. Background Art

[0002] Electro-hydraulic servo actuators are mainly used in industries with high precision, high response and large loads to achieve various force loading. The application industries are as follows:

[0003] A. In the test bench industry, various loading tests in the form of simulated loads for parts in the fields of automobiles, aviation, etc. all use electro-hydraulic servo actuators.

[0004] B. In the metallurgical industry, electric furnace control systems, rolling mill control systems, open-hearth hearth charging, converter control, blast furnace control, strip deviation and constant tension devices all use electro-hydraulic servo actuators.

[0005] C. Hydraulic transmission is widely used in construction machinery, such as excavators, tire loaders, truck cranes, crawler bulldozers, tire cranes, self-propelled scrapers, graders and vibratory rollers.

[0006] D. In the automotive industry, hydraulic off-road vehicles, hydraulic dump trucks, hydraulic aerial work vehicles and fire trucks all use hydraulic technology.

[0007] E. In the light textile industry, hydraulic cylinders are used in plastic injection molding machines, rubber vulcanizing machines, papermaking machines, printing machines and textile machines.

[0008] The structure of the electro-hydraulic servo loading device mainly includes the following components: electro-hydraulic servo valve, servo actuator, displacement sensor, tension and pressure sensor, and anti-lateral force connection mechanism;

[0009] One end of the electro-hydraulic servo actuator is connected to a related object in the form of a ball joint, and the other end is connected to a gantry or various forms of test platforms and bases in the form of a flange.

[0010] The working principle of the electro-hydraulic servo actuator is a device that converts electrical energy into hydraulic energy; a feedback control system composed of an electrical signal conversion device and a hydraulic actuator. The output of the system, such as displacement, speed or force, can automatically, quickly and accurately change with changes in the input quantity. At the same time, the output power is greatly amplified.

[0011] The control methods of electro-hydraulic servo actuators include electro-hydraulic position servo system and electro-hydraulic force servo control system.

[0012] The piston rod of the existing electro-hydraulic servo actuator is seriously worn, and the inner wall of the cylinder of the servo actuator is also seriously worn. The wear is mainly concentrated on one side of the servo actuator. The reasons are analyzed as follows: It is mainly caused by the connection method of the servo actuator. The connection method of the existing servo actuator is that one end is connected to the object to be loaded in the form of a ball joint, and the other end is connected to the gantry or various forms of test platforms and bases in the form of a flange. This results in one end being hinged and the other end being fixedly connected. The hinged end has a small range of motion, and the flange end cannot move. Therefore, the piston rod is inevitably affected by its own gravity and load during movement. Lateral force is bound to be generated. If the lateral force cannot be eliminated, it will act on the cylinder body. In the long run, one side of the piston rod will continue to contact with one side of the cylinder body and wear continuously, resulting in serious wear on one side of the cylinder body of the servo actuator and oil leakage, making the equipment unable to continue to work and affecting production. Summary of the invention

[0013] The purpose of the present application is to provide an electro-hydraulic servo actuator that resists lateral force and solves the rigid connection disadvantages of the existing servo actuator flange connection, improves the wear and oil leakage of the servo actuator, reduces piston rod damage, and prolongs the service life.

[0014] A lateral force resisting electro-hydraulic servo actuator comprises an lateral force resisting device, one side of the lateral force resisting device is connected to a joint bearing via a tension pressure sensor, the other side of the lateral force resisting device is connected to an electro-hydraulic servo valve via a servo actuator, and the electro-hydraulic servo valve is connected to a displacement sensor.

[0015] Preferably, the lateral force resistance device of the present application comprises a box body, large supports connected by shafts are respectively arranged at both ends of the length direction of the box body, and two small supports are symmetrically arranged on one side of the length direction of the box body.

[0016] Preferably, the servo actuator of the present application is provided with an end cover, and the end cover is provided with a trunnion that cooperates with the small support.

[0017] Preferably, the trunnion and the small support of the present application are connected via a radial bearing.

[0018] Preferably, the two large supports of the present application are respectively fixedly connected to the mounting base.

[0019] This application adopts the above technical solution, which has the following advantages compared with the prior art:

[0020] In the present application, two ear shafts extend from the end cover of the servo actuator, and two small supports of the anti-lateral force device are connected to the ear shafts of the end cover through radial bearings and can rotate around the ear shafts; the two small supports are fixed on the box body, and two other shafts extend from the box body in a direction perpendicular to the ear shafts. These two shafts are connected to two large supports, and the two large supports are respectively fixed on the mounting base.

[0021] When the servo actuator is in motion, when the piston rod is extended or retracted, if the piston rod is subjected to lateral force and deviates to one side, the cylinder body rotates with the piston rod and the ear shaft to offset the lateral force. If it deviates to the other side, the cylinder body will rotate with the large support to offset the lateral force. In other words, the lateral force in any direction on the piston rod can be offset by the anti-lateral force device, thereby protecting the piston rod and the cylinder body from damage and greatly increasing the life of the electro-hydraulic servo actuator. This solves the rigid connection disadvantage of the existing servo actuator flange connection and prevents the servo actuator from wear and oil leakage due to lateral force, thereby damaging the piston rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of this application.

[0023] Figure 2 It is a structural schematic diagram of the lateral force resistance device of the present application. DETAILED DESCRIPTION

[0024] The technical solution of the present application is described in detail below with reference to the accompanying drawings:

[0025] like Figure 1 As shown, an anti-lateral force electro-hydraulic servo actuator includes an anti-lateral force device 1, one side of the anti-lateral force device 1 along the length direction is connected to a joint bearing 3 through a tension pressure sensor 2, and the other side is connected to an electro-hydraulic servo valve 5 through a servo actuator 4, and the electro-hydraulic servo valve 5 is connected to a displacement sensor 6.

[0026] like Figure 1 As shown, the anti-lateral force device 1 of the present application includes a box body 13, large supports 11 connected by shafts 14 are respectively arranged at both ends of the box body 13 in the length direction, and two small supports 12 are symmetrically arranged on one side of the box body 13 in the length direction.

[0027] like Figure 1 , Figure 2 As shown, the servo actuator 4 of the present application is provided with an end cover, and a trunnion matching with the small support 12 is provided on the end cover.

[0028] like Figure 1 , Figure 2 As shown, the trunnion 15 of the present application is connected to the small support 12 via a radial bearing.

[0029] The present application extends two ear shafts on the end cover of the servo actuator 4. Two small supports 12 of the anti-lateral force device are connected to the ear shafts of the end cover through radial bearings and can rotate around the ear shafts. The two small supports 12 are fixed to the box body 13. Two other shafts 14 extend from the box body 13 in a direction perpendicular to the ear shafts. These two shafts 14 are connected to two large supports 11, and the two large supports 11 are respectively fixed to the mounting base. When the servo actuator 4 is in motion, when the piston rod is extended or retracted, when the piston rod is biased to one side by the lateral force, the cylinder body rotates with the piston rod along with the ear shaft to offset the lateral force. If it is biased to the other side, the cylinder body will rotate with the large support to offset the lateral force.

[0030] The two large supports and the spherical bearing 3 of the present application are two fixed ends, which are respectively connected to the loaded product and the mounting base; when the electro-hydraulic servo actuator is working, the hydraulic oil controls the piston rod of the electro-hydraulic servo actuator through the electro-hydraulic servo valve 5 to drive the spherical bearing 3 and the tension and pressure sensor 2 to extend and retract, so as to provide force or displacement to the loaded product. During the loading process, the piston rod will be affected by some external forces, resulting in stress between the piston rod and the cylinder of the servo actuator 4; after adding the anti-lateral force device, the cylinder body will offset the stress as the piston rod moves. No matter what direction the piston rod is subjected to stress, it can be offset by the anti-lateral force device, thereby protecting the piston rod and the cylinder body from damage, and greatly increasing the life of the electro-hydraulic servo actuator.

Claims

1. An electro-hydraulic servo actuator for resisting lateral force, characterized in that The anti-lateral force device (1) comprises a device for resisting lateral force (1), one side of which is connected to a joint bearing (3) via a tension pressure sensor (2) along the length direction of the device for resisting lateral force (1), and the other side of which is connected to an electro-hydraulic servo valve (5) via a servo actuator (4), and the electro-hydraulic servo valve (5) is connected to a displacement sensor (6); the device for resisting lateral force (1) comprises a box body (13), large supports (11) connected via a shaft (14) are respectively arranged at both ends of the box body (13) in the length direction, and two small supports (12) are symmetrically arranged on one side of the box body (13) in the length direction; an end cover is arranged on the servo actuator (4), and an ear shaft matched with the small support (12) is arranged on the end cover; the ear shaft (15) is connected to the small support (12) via a radial bearing; and the two large supports (11) are respectively fixedly connected to the mounting seat.

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