Multi-mode switching electro-hydraulic servo test system

Abstract

The invention provides a multi-mode switching electro-hydraulic servo test system, and relates to the technical field of steering engine performance test equipment. The device comprises a frame body, a passive load mechanism and an active load mechanism. Wherein two connecting parts are arranged on the frame body, a loading shaft is rotatably arranged on the frame body, and a first rocker arm and a second rocker arm are respectively arranged on the periphery of the loading shaft; two ends of the steering engine are respectively hinged with the first rocker arm and the corresponding connecting part; the passive load mechanism comprises a spring rod, a fixing assembly, a torque transmission unit and an inertia disc. The fixing assembly is arranged on the frame body, one end of the spring rod is connected with the fixing assembly, the other end of the spring rod penetrates through an inner hole of the loading shaft, the torque transmission unit is arranged between the spring rod and the loading shaft, and the inertia disc is arranged on the loading shaft in a sleeving mode; the two ends of the active load mechanism are hinged to the second rocker arm and the corresponding connecting parts respectively. The multi-mode switching electro-hydraulic servo test system can conveniently test the active load and the passive load of the steering engine.

Description

Technical Field

[0001] The present invention relates to the technical field of servo testing equipment, and specifically, to an electro-hydraulic servo testing system with multi-mode switching. Background Art

[0002] In the aerospace field, servo motors are usually used to control the movement of the rudder surface of an aircraft, so as to achieve precise control of the flight attitude and heading. The electro-hydraulic servo testing system is used to realize the load simulation test of the servo motor to evaluate the dynamic performance index and static performance index of the servo motor.

[0003] Currently, some servo comprehensive test benches complete the active load test of the servo motor to be tested by installing the output end of the loading hydraulic cylinder and the free end of the servo motor to be tested on the same rocker arm, and then applying the output of the loading hydraulic cylinder to the servo motor to be tested. In addition, some servo comprehensive test benches complete the passive load test of the servo motor to be tested by driving the elastic rod and the inertia disk to rotate by the output end of the servo motor to be tested.

[0004] However, the defect of the above solution is that if it is necessary to perform the active load test and the passive load test on the servo motor to be tested, two simulation test systems need to be built, and the state needs to be frequently switched during the simulation test, resulting in a large investment in equipment and a large occupied space. Summary of the Invention

[0005] Therefore, the present invention proposes an electro-hydraulic servo testing system with multi-mode switching to at least partially solve the technical problem that the existing servo testing equipment cannot perform the active load test and the passive load test simultaneously.

[0006] The technical solution of the present invention is as follows: An electro-hydraulic servo testing system with multi-mode switching, comprising: A frame body, on which two connecting parts are provided and a loading shaft is rotatably provided. Corresponding to the two connecting parts, a first rocker arm and a second rocker arm are respectively provided on the outer periphery of the loading shaft; the first rocker arm is used for being hinged to the output end of the servo motor to be tested, and the corresponding connecting part is used for being hinged to the other end of the servo motor; A passive load mechanism, including a spring rod, a fixing component, a torque transmission unit and an inertia disk; the fixing component is provided on the frame body, one end of the spring rod is connected to the fixing component, the other end passes through the inner hole of the loading shaft, the torque transmission unit is provided between the spring rod and the loading shaft, and the inertia disk is sleeved on the loading shaft; An active load mechanism, including a linear power output unit, the output end of the linear power output unit is hinged to the second rocker arm, and the other end is hinged to the corresponding connecting part.

[0007] Further, the torque transmission unit includes a clamping cylinder fixed to one end of the loading shaft. The spring rod passes through the clamping cylinder, and a split groove is formed on the end face of the clamping cylinder away from the loading shaft. The two sides of the split groove of the clamping cylinder can be connected by fasteners to clamp the spring rod.

[0008] Further, the torque transmission unit further includes two clamping blocks. The outer peripheral surfaces of the two clamping blocks are adapted to the inner hole of the clamping cylinder, and grooves adapted to the outer peripheral surface of the spring rod are respectively formed on the two clamping blocks. When the two sides of the split groove of the clamping cylinder are connected by fasteners, the two clamping blocks are clamped, and the two clamping blocks clamp the spring rod.

[0009] Further, the fixing assembly includes a fixing base, a torque sensor and a connecting seat; the fixing base is connected to the frame body, one end of the torque sensor is fixed on the fixing base, the connecting seat is connected to the input end of the torque sensor, and the spring rod is fixedly connected to the connecting seat.

[0010] Further, the fixing base includes a base, a mounting seat, a transmission member and a driving unit; the base is arranged on the frame body, the transmission member is slidably arranged on the base, the mounting seat is rotatably arranged on the base and the transmission member, and the driving unit is arranged between the transmission member and the base and can drive the transmission member to slide along the length direction of the spring rod on the mounting seat to lock or unlock the rotation of the mounting seat relative to the base.

[0011] Further, a lead screw parallel to the loading shaft is rotatably installed on the frame body, and a nut screwed to the lead screw is arranged on the fixing assembly; two first T-shaped grooves extending along the axial direction of the lead screw are formed on the frame body, and at least two positioning holes corresponding to each of the first T-shaped grooves are respectively arranged on the fixing assembly; the positioning holes and the first T-shaped grooves are connected by fasteners, so that the fixing position of the fixing assembly on the frame body can be adjusted along the length direction of the first T-shaped groove.

[0012] Further, an encoder is further included. The housing of the encoder is fixedly arranged on the frame body, and the encoder shaft of the encoder is coaxially and fixedly connected to the loading shaft.

[0013] Further, a mounting plate with a thickness direction parallel to the axial direction of the loading shaft is fixedly arranged on the outer periphery of the loading shaft, and the first swing arm and the second swing arm are respectively arranged on both sides of the mounting plate.

[0014] Further, a guiding seat is provided at the output end of the linear power output unit. A connecting rod is provided on the guiding seat. One end of the connecting rod away from the guiding seat is hinged to the second rocker arm. And a limiting component is operably arranged on the guiding seat, and the limiting component can selectively limit the sliding of the connecting rod.

[0015] Further, a first guiding hole with a square cross-section is provided on the guiding seat. The connecting rod is slidably disposed in the first guiding hole. And a through hole is provided on the side wall of the first guiding hole. A limiting post passing through the through hole is provided on the connecting rod. The limiting component includes a second motor, a cam, a clamping block and an elastic member. The second motor is fixedly disposed on the guiding seat. The cam is fixedly sleeved on the motor shaft of the motor. The clamping block can slide on the guiding seat in a direction perpendicular to the axial direction of the first guiding hole. And a clamping groove is provided on the clamping block. The clamping block can be pushed by the cam to make the limiting post snap into the clamping groove. And the clamping block can be pushed by the elastic member to make the limiting post disengage from the clamping groove.

[0016] The working principle and beneficial effects of the present invention are as follows: The electro-hydraulic servo test system with multi-mode switching provided by the present invention is provided with a loading shaft on the frame body, and a passive load mechanism is provided on the loading shaft. An active load mechanism connected to the loading shaft is provided on the frame body. That is, the electro-hydraulic servo test system of the present invention can not only perform active load loading tests on the servo to be tested, but also perform passive load loading tests on the servo to be tested. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described in detail below with reference to the drawings and specific embodiments.

[0018] Figure 1 It is a three-dimensional view of the electro-hydraulic servo test system with multi-mode switching provided by the embodiment of the present invention; Figure 2 It is a three-dimensional view of another angle of the electro-hydraulic servo test system with multi-mode switching provided by the embodiment of the present invention; Figure 3 It is a sectional view of the electro-hydraulic servo test system with multi-mode switching provided by the embodiment of the present invention; Figure 4 It is a structural sectional view of another fixing seat provided by the embodiment of the present invention; Figure 5 It is an exploded view of another fixing seat provided by the embodiment of the present invention; Figure 6 It is a three-dimensional view of the cooperation between the guiding seat and the connecting rod provided by the embodiment of the present invention; Figure 7 It is an exploded view of the cooperation between the guiding seat and the connecting rod provided by the embodiment of the present invention; In the figure: 100, frame; 110, bearing seat; 120, first hinge seat; 130, second hinge seat; 101, first T-shaped groove; 102, second T-shaped groove; 103, mounting hole; 200, passive load mechanism; 210, spring rod; 220, fixing component; 221, fixing seat; 222, torque sensor; 223, connecting seat; 224, nut; 225, base; 226, mounting seat; 2261, second insert block; 227, transmission component; 2271, first insert block; 228, drive unit; 2281, first motor; 2282, screw rod; 230, torque transmission unit; 231, holding cylinder; 232, clamping block; 240, inertia disk; 201, dividing groove; 202, positioning hole; 203, first jack; 204, second jack; 205, threaded hole; 300, active load mechanism; 400, loading shaft; 410, mounting plate; 420, first rocker arm; 430, second rocker arm; 500, steering gear; 600, linear power output unit; 610, guide seat; 620, connecting rod; 621, limit post; 630, limit component; 631, second motor; 632, cam; 633, clamping block; 6331, guide post; 634, elastic component; 601, through hole; 602, card slot; 603, second guide hole; 700, lead screw; 800, encoder. Specific implementation manner

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts fall within the scope of protection of the present invention.

[0020] This embodiment provides a multi-mode switching electro-hydraulic servo test system, which will be hereinafter simply referred to as the test system. Refer to Figures 1 to 3 As shown, it includes a frame 100, a passive load mechanism 200 and an active load mechanism 300. Among them, a loading shaft 400 is rotatably provided on the frame 100, and two connecting parts are provided on the frame 100. Corresponding to the two connecting parts, a first rocker arm 420 and a second rocker arm 430 are respectively provided on the outer periphery of the loading shaft 400; the first rocker arm 420 is used for being hinged to the output end of the steering gear 500 to be tested, and the corresponding connecting part is used for being hinged to the other end of the steering gear 500.

[0021] The passive load mechanism 200 of this embodiment includes a spring rod 210, a fixing component 220, a torque transmission unit 230, and an inertia disk 240. Among them, the fixing component 220 is fixedly arranged on the frame body 100. One end of the spring rod 210 is connected to the fixing component 220, and the other end passes through the inner hole of the loading shaft 400. The torque transmission unit 230 is arranged between the spring rod 210 and the loading shaft 400. Specifically, the other end of the spring rod 210 penetrates the inner hole of the loading shaft 400, and the torque transmission unit 230 fixes the spring rod 210 on the loading shaft 400. The inertia disk 240 is fixedly sleeved on the loading shaft 400. The active load mechanism 300 of this embodiment includes a linear power output unit 600. The output end of the linear power output unit 600 is hinged to the second rocker arm 430, and the other end is hinged to the corresponding connecting part.

[0022] Based on the above structure, when the test system of this embodiment is in use, the loading shaft 400 can be driven to rotate by the servo 500 to be tested, and the spring rod 210 can be driven to twist and the inertia disk 240 can be driven to rotate by the loading shaft 400. Among them, the torsional moment load generated by the spring rod 210 acts on the servo 500 to be tested, simulating the torque load received by the servo 500; the rotation of the inertia disk 240 simulates the inertia moment borne by the servo 500 in the actual process; thus, the passive load test of the servo 500 to be tested is carried out.

[0023] It should be noted that the inertia required to be provided by the inertia disk 240 needs to subtract the structural inertia and damping inertia of the linear power output unit 600 from the inertia required to be applied by the servo 500 to be tested. Among them, the structural inertia can be calculated by using simulation software. The calculation formula for the damping inertia is: damping inertia = mass force * R 2 . Wherein, R is the rotation radius of the linear power output unit 600 pushing the second rocker arm 430 to rotate around the loading shaft 400, or the distance between the axis of the hinge hole on the second rocker arm 430 and the axis of the loading shaft 400. The mass force can be equivalently the damping force received by the output end of the linear power output unit 600. The calculation process of the damping force is: damping force = damping coefficient * speed; wherein, the damping coefficient is a constant, and the speed is the first derivative of the displacement of the output end of the linear power output unit 600, and the displacement of the output end of the linear power output unit 600 can be collected in real time by a displacement sensor.

[0024] When the test system of this embodiment is in use, the loading shaft 400 can also be driven to rotate by the linear power output unit 600, and the spring rod 210 can be driven to twist and the inertia disk 240 can be driven to rotate by the loading shaft 400. Among them, the torque output by the linear power unit combined with the torque generated by the spring rod 210 jointly simulates the aerodynamic hinge moment of the rudder surface, and the rotation of the inertia disk 240 simulates the inertia moment borne by the servo 500 in actual work; thus, the active load test of the servo 500 to be tested is carried out.

[0025] Generally speaking, the test system of this embodiment can not only perform passive load tests on the servo 500 to be tested, but also perform active load loading tests on the servo 500 to be tested, without setting up two sets of independent devices and without frequently moving the servo 500 to be tested between the two devices, thus simplifying the test steps and improving the test efficiency.

[0026] Reference Figures 1 to 3 As shown in the figure, two bearing seats 110 are fixedly arranged on the frame body 100. The two bearing seats 110 are parallel and spaced apart. Bearings are respectively installed on the two bearing seats 110. The above-mentioned loading shaft 400 is fixedly inserted through the inner holes of the two bearings, so that the loading shaft 400 can rotate on the frame body 100. An installation plate 410 with a thickness direction parallel to the axial direction of the loading shaft 400 is fixedly arranged on one side of the loading shaft 400. The above-mentioned first rocker arm 420 and second rocker arm 430 are respectively arranged on both sides of the installation plate 410. For the convenience of description, the connecting part opposite to the first rocker arm 420 will be referred to as the first connecting part, and the connecting part opposite to the second rocker arm 430 will be referred to as the second connecting part hereinafter.

[0027] Reference Figure 2 As shown in the figure, the first connecting part is a first hinge seat 120 fixedly arranged on the frame body 100. The output end of the servo 500 to be tested is hinged to the first rocker arm 420, and the other end of the servo 500 is hinged to the first hinge seat 120. Based on this structure, when the telescopic end of the servo 500 expands and contracts, it can drive the loading shaft 400 to rotate.

[0028] Reference Figure 1 As shown in the figure, the torque transmission unit 230 of this embodiment includes a holding cylinder 231. The holding cylinder 231 is fixed to one end of the loading shaft 400. The above-mentioned spring rod 210 passes through the holding cylinder 231. A split groove 201 is formed on the end face of one end of the holding cylinder 231. The holding cylinder 231 on both sides of the split groove 201 can be connected by fasteners to hold the spring rod 210 tightly. When the holding cylinder 231 on both sides of the split groove 201 is connected by fasteners and holds the spring rod 210 tightly, the torque generated by the spring rod 210 is transmitted to the loading shaft 400 and then applied to the servo 500.

[0029] Reference Figure 1 As shown in the figure, the torque transmission unit 230 of this embodiment further includes two clamping blocks 232. The outer peripheral surfaces of the two clamping blocks 232 are adapted to the inner hole of the holding cylinder 231, and grooves adapted to the outer peripheral surface of the spring rod 210 are respectively arranged on the two clamping blocks 232. When the holding cylinder 231 on both sides of the split groove 201 is connected by fasteners, it holds the two clamping blocks 232 tightly, and the two clamping blocks 232 hold the spring rod 210 tightly. A torque transmission unit 230 with the same structure is arranged between the spring rod 210 and the fixing component 220, and details thereof will not be described herein again.

[0030] In this embodiment, by providing the above-mentioned torque transmission unit 230, it is possible to more conveniently replace the spring rod 210 of different sizes for the test system, so as to apply different torque loads to the servo 500 to be tested. Specifically, when it is necessary to replace the spring rod 210 of different sizes, only the corresponding clamping blocks 232 need to be replaced simultaneously. By changing the size of the grooves on the clamping blocks 232 without changing the size of the outer periphery of the clamping blocks 232, the two clamping blocks 232 can still be clamped by the clamping cylinder 231 and clamp the spring rod 210.

[0031] In some embodiments, the spring rod 210 can also be directly clamped by the clamping cylinder 231, but replacing the spring rod 210 of different sizes requires replacing the clamping cylinder 231 with a different inner diameter, which is more troublesome compared with the solution of this embodiment.

[0032] Reference Figures 1 to 3 As shown, the fixing component 220 of this embodiment includes a fixing base 221, a torque sensor 222, and a connecting base 223. Among them, the fixing base 221 is fixedly connected to the frame body 100, one end of the torque sensor 222 is arranged on the fixing base 221, the connecting base 223 is connected to the input end of the torque sensor 222, and the spring rod 210 is connected to the connecting base 223. By installing the torque sensor 222, it is possible to conveniently measure the torque received by the spring rod 210, that is, to measure the torque load applied to the servo 500.

[0033] By installing the above-mentioned torque sensor 222 at one end of the spring rod 210, on the one hand, it is convenient for users to calibrate the required stiffness coefficient. Specifically, before the test, through the feedback of the torque sensor 222 and the following encoder 800, the stiffness coefficient of the current spring rod 210 can be calculated. Among them, the stiffness coefficient is specifically the ratio of the torque value measured by the torque sensor 222 to the torsional angle measured by the encoder 800. Although the stiffness coefficient of the spring rod 210 has been calibrated before leaving the factory, due to the influence of the actual working conditions, the calibrated stiffness coefficient may not meet the needs of users, and users can find the stiffness coefficient that meets the test conditions through this method.

[0034] On the other hand, through the data feedback of the torque sensor 222 and the data feedback of the servo 500, the characteristic data of the servo 500 under different linear loads can be reflected, such as the relationship between any two parameters of torque, the rotation angle of the servo 500, voltage, current, power, etc. Through these parameter relationships, the performance of the servo 500 can be deeply understood, and the system bandwidth of the servo 500 can be evaluated.

[0035] Reference Figure 2 and Figure 3As shown, in this embodiment, a lead screw 700 parallel to the loading shaft 400 is rotatably installed on the frame body 100, and a nut 224 screwed with the lead screw 700 is provided on the fixed seat 221. Two first T-shaped grooves 101 extending along the axial direction of the lead screw 700 are formed on the frame body 100, and at least two positioning holes 202 are respectively provided on the fixed seat 221 corresponding to each first T-shaped groove 101. Through the two first T-shaped grooves 101 and the positioning holes 202, the fixed seat 221 can be fixed on the frame body 100 by a bolt pair, and the fixed position of the fixed seat 221 on the frame body 100 can be adjusted along the length direction of the first T-shaped groove 101.

[0036] By enabling the fixed position of the fixed seat 221 on the frame body 100 to be adjusted in the above manner, the torque load applied to the servo 500 can be adjusted. Specifically, by rotating the lead screw 700, the distance between the fixed seat 221 and the loading shaft 400 can be adjusted, that is, the clamping length of the spring rod 210 is adjusted to further adjust the torque. Among them, when the clamping length of the spring rod 210 is different, its torsional stiffness is also different, and the product of the torsional stiffness and the rotation angle is the torque.

[0037] In some embodiments, referring to Figure 4 and Figure 5 As shown, the fixed seat 221 includes a base 225, a mounting seat 226, a transmission member 227, and a driving unit 228. Among them, the base 225 is provided on the frame body 100, the transmission member 227 is slidably provided on the base 225, the mounting seat 226 is rotatably provided on the base 225 and the transmission member 227, and the aforementioned torque sensor 222 is specifically provided on the mounting seat 226. The driving unit 228 is provided between the transmission member 227 and the base 225, and the transmission member 227 can be driven by the driving unit 228 to slide on the mounting seat 226 along the length direction of the spring rod 210 to lock or unlock the rotation of the mounting seat 226 relative to the base 225.

[0038] That is to say, in this embodiment, when the transmission member 227 locks the rotation of the mounting seat 226 relative to the base 225, the base 225 can limit the rotation of the spring rod 210. When the servo 500 to be tested drives the loading shaft 400 to rotate, the spring rod 210 can twist as the loading shaft 400 rotates to simulate the torque load received by the servo 500, which is applicable to the passive load test of the servo 500.

[0039] When the transmission member 227 does not restrict the rotation of the mounting seat 226 relative to the base 225, when the output end of the linear power output unit 600 drives the loading shaft 400 to rotate, the spring rod 210 will rotate freely with the loading shaft 400 without being twisted. When testing the active load of the servo 500, the torque load applied to the servo 500 only comes from the linear power output unit 600. Compared with the previous situation where when testing the active load of the servo 500, the torque load received by the servo 500 comes from both the linear power output unit 600 and the spring rod 210, the solution of this embodiment can apply a more accurate and controllable torque load to the servo 500 during the active load test of the servo 500.

[0040] Reference Figure 4 And Figure 5 As shown, in this embodiment, a plurality of first jacks 203 are formed on the base 225, and corresponding to each first jack 203 on the transmission member 227, there are first inserts 2271 that can slide in each jack, so that the transmission member 227 can be guided and slide on the base 225. And a plurality of second jacks 204 are provided on the transmission member 227, and corresponding to each second jack 204 on the mounting seat 226, there are second inserts 2261. When the transmission member 227 slides away from the mounting seat 226, the second inserts 2261 are not inserted into the second jacks 204. At this time, the mounting seat 226 can rotate relative to the base 225; when the transmission member 227 slides close to the mounting seat 226 and each second insert 2261 is inserted into the corresponding second jack 204, the base 225 and the transmission member 227 can restrict the rotation of the mounting seat 226. At this time, when the loading shaft 400 rotates, it will drive the spring rod 210 to twist.

[0041] By providing the fixing seat 221 as above, it is possible to conveniently cut off the connection between the spring rod 210 and the base 225, or connect the spring rod 210 to the base 225, and thus conveniently switch between two modes of testing the active load of the servo 500 and testing the passive load of the servo 500.

[0042] The drive unit 228 of this embodiment includes a first motor 2281 fixed on the base 225, and a screw rod 2282 that can rotate driven by the first motor 2281 and is screwed into the threaded hole 205. Based on this structure, the first motor 2281 can drive the screw rod 2282 to rotate. By the sliding of each first insert 2271 in the corresponding first jack 203, the transmission member 227 can slide on the mounting seat 226 along the length direction of the spring rod 210, so that the above-mentioned second inserts 2261 are inserted into the corresponding second jacks 204, or the second inserts 2261 are withdrawn from the corresponding second jacks 204.

[0043] Reference Figure 2As shown in the figure, the test system of this embodiment further includes an encoder 800. The housing of the encoder 800 is fixedly arranged on one of the bearing seats 110, and the encoder shaft of the encoder 800 is coaxial and fixedly connected with the loading shaft 400. By arranging the encoder 800, it is possible to conveniently measure the torsional angle of the loading shaft 400, that is, the spring rod 210. In the prior art, the encoder 800 is generally fixed at the end of the spring rod 210, but there may be some deviation between the torsional angle at the end of the spring rod 210 and the torsional angle at the force-bearing part of the spring rod 210. Therefore, in this embodiment, by connecting the encoder 800 shaft with the loading shaft 400, the measurement of the torsional angle of the spring rod 210 can be more accurate.

[0044] The second connecting part is a second hinge seat 130 arranged on the frame body 100. The output end of the linear power output unit 600 is hinged with the second rocker arm 430, and the other end of the linear power output unit 600 is hinged with the second hinge seat 130. Based on this structure, when the output end of the linear power output unit 600 expands and contracts, it can drive the loading shaft 400 to rotate. It should be noted that the above-mentioned hinge structures can all refer to the prior art, and will not be elaborated here.

[0045] As Figure 2 shown, in this embodiment, two second T-shaped grooves 102 are arranged on the frame body 100. The extending directions of the two second T-shaped grooves 102 are perpendicular to the axial direction of the loading shaft 400, and at least two mounting holes 103 are respectively arranged on the second hinge seat 130 corresponding to each second T-shaped groove 102. Through the two second T-shaped grooves 102 and each mounting hole 103, the second hinge seat 130 can be fixed on the frame body 100 by fasteners, and the fixed position of the second hinge seat 130 on the frame body 100 can be adjusted along the length direction of the second T-shaped groove 102.

[0046] In this embodiment, by enabling the fixed position of the second hinge seat 130 on the frame body 100 to be adjusted along the length direction of the second T-shaped groove 102, it is possible to more conveniently replace linear power output units 600 of different specifications to meet different loading torque requirements. In this embodiment, the linear power output unit 600 is a hydraulic cylinder. In some embodiments, the linear power output unit 600 can also be an air cylinder or an electric cylinder, etc.

[0047] In some embodiments, as Figure 6 and Figure 7 shown, a guide seat 610 is arranged on the output end of the linear power output unit 600, and a connecting rod 620 is slidably arranged on the guide seat 610. One end of the connecting rod 620 away from the guide seat 610 is hinged with the second rocker arm 430, and a limiting component 630 is operably arranged on the guide seat 610. The limiting component 630 can selectively limit the sliding of the connecting rod 620 on the guide seat 610.

[0048] Wherein, when the limiting component 630 restricts the sliding of the connecting rod 620 on the guiding seat 610, the output end of the linear power output unit 600 can drive the loading shaft 400 to rotate through the connecting rod 620, so as to apply a torque load to the servo 500 to be tested, which is applicable to the active loading test of the servo 500. When the limiting component 630 does not restrict the sliding of the connecting rod 620 on the guiding seat 610, when the servo 500 drives the loading shaft 400 to rotate, the sliding of the connecting rod 620 on the guiding seat 610 can be used to avoid the loading shaft 400 from being loaded by the linear power output unit 600, which is applicable to the passive load test of the servo 500.

[0049] Reference Figure 6 and Figure 7 As shown, a first guiding hole with a square cross-section is provided on the guiding seat 610. The connecting rod 620 is slidably disposed in the first guiding hole, and a through hole 601 is provided on the side wall of the first guiding hole. A limiting post 621 passing through the through hole 601 is provided on the connecting rod 620. The limiting component 630 includes a second motor 631, a cam 632, a clamping block 633 and an elastic member 634. Among them, the second motor 631 is fixedly disposed on the guiding seat 610, the cam 632 is fixedly sleeved on the motor shaft of the motor, and there are two second guiding holes 603 on the guiding seat 610 whose axial directions are perpendicular to the axial direction of the first guiding hole; and a guiding post 6331 capable of guiding and sliding in the two second guiding holes correspondingly is provided on the clamping block 633, and a clamping groove 602 is provided on the clamping block 633. The elastic member 634 is a spring sleeved on the guiding post 6331 and abutted between the clamping block 633 and the guiding seat 610.

[0050] Based on the above structure, when the motor shaft of the second motor 631 drives the cam 632 to rotate until the high point of the cam 632 abuts against the clamping block 633, the clamping block 633 can be driven to slide so that the limiting post 621 on the connecting rod 620 slides into the clamping groove 602, thereby restricting the sliding of the connecting rod 620 relative to the guiding seat 610. When the cam 632 rotates until the low point of the cam 632 abuts against the clamping block 633, the clamping block 633 can be pushed by the elastic member 634 to disengage the limiting post 621 from the clamping groove 602, so that the connecting rod 620 can slide on the guiding seat 610. In this solution, the second motor 631 can be used to lock and unlock the connecting rod 620 on the guiding seat 610, and then it is convenient to switch between two modes of the active load test of the servo 500 and the passive load test of the servo 500.

[0051] It should be noted that the test system of this embodiment can also be simply disassembled to complete the passive load simulation test and the active load simulation test respectively, specifically as follows: Passive load simulation test: Disconnect the output end of the linear power output unit 600 from the second rocker arm 430, that is, remove the connecting pin shaft. The servo 500 to be measured drives the loading shaft 400 to rotate through the first rocker arm 420. The spring rod 210 twists to generate a torsional moment load applied to the servo 500 to be measured; during the process of the servo 500 to be measured driving the first rocker arm 420 to rotate, the inertia disk 240 simulates the moment of inertia of the load that the servo 500 needs to drive during actual operation.

[0052] Active load simulation test: Disconnect the connection between the spring rod 210 and the loading shaft 400, connect the output end of the linear power output unit 600 to the second rocker arm 430 through a pin shaft, and control the linear power output unit 600 to output a moment through instructions to simulate the aerodynamic hinge moment of the control surface; during the rotation of the loading shaft 400, the inertia disk 240 simulates the moment of inertia of the load that the servo needs to drive during actual operation.

[0053] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A multi-mode switching electro-hydraulic servo test system, characterized in that, Comprising: A frame body, on which two connecting parts are provided and a loading shaft is rotatably provided. Corresponding to the two connecting parts, a first rocker arm and a second rocker arm are respectively provided on the outer periphery of the loading shaft; the first rocker arm is used for being hinged to the output end of the servo to be tested, and the corresponding connecting part is used for being hinged to the other end of the servo. A passive load mechanism, including a spring rod, a fixing component, a torque transmission unit and an inertia disk; the fixing component is arranged on the frame body, one end of the spring rod is connected to the fixing component, the other end passes through the inner hole of the loading shaft, the torque transmission unit is arranged between the spring rod and the loading shaft, and the inertia disk is sleeved on the loading shaft. An active load mechanism, including a linear power output unit, the output end of the linear power output unit is hinged to the second rocker arm, and the other end is hinged to the corresponding connecting part.

2. The multi-mode switching electro-hydraulic servo test system according to claim 1, characterized in that, The torque transmission unit includes a holding cylinder, the holding cylinder is fixed on one end of the loading shaft, the spring rod passes through the holding cylinder, and a splitting groove is formed on the end face of the holding cylinder far away from the loading shaft end. The holding cylinder on both sides of the splitting groove can be connected by fasteners to hold the spring rod tightly.

3. The multi-mode switching electro-hydraulic servo test system according to claim 2, characterized in that, The torque transmission unit further includes two clamping blocks, the outer peripheral surfaces of the two clamping blocks are adapted to the inner hole of the holding cylinder, and grooves adapted to the outer peripheral surface of the spring rod are respectively formed on the two clamping blocks. When the holding cylinder on both sides of the splitting groove is connected by fasteners, the two clamping blocks are held tightly, and the two clamping blocks hold the spring rod tightly.

4. The multi-mode switching electro-hydraulic servo test system according to claim 1, characterized in that, The fixing component includes a fixing seat, a torque sensor and a connecting seat; the fixing seat is connected to the frame body, one end of the torque sensor is fixed on the fixing seat, the connecting seat is connected to the input end of the torque sensor, and the spring rod is fixedly connected to the connecting seat.

5. The multi-mode switching electro-hydraulic servo test system according to claim 4, characterized in that, The fixing seat includes a base, a mounting seat, a transmission part and a driving unit; the base is arranged on the frame body, the transmission part is slidably arranged on the base, the mounting seat is rotatably arranged on the base and the transmission part, and the driving unit is arranged between the transmission part and the base and can drive the transmission part to slide on the mounting seat along the length direction of the spring rod to lock or unlock the rotation of the mounting seat relative to the base.

6. The multi-mode switching electro-hydraulic servo test system according to claim 1, characterized in that, A lead screw parallel to the loading shaft is rotatably mounted on the frame body, and a nut screwed to the lead screw is provided on the fixing component; two first T-shaped grooves extending along the axial direction of the lead screw are formed on the frame body, and at least two positioning holes corresponding to each first T-shaped groove are respectively provided on the fixing component; the positioning holes and the first T-shaped grooves are connected by fasteners, so that the fixing position of the fixing component on the frame body can be adjusted along the length direction of the first T-shaped groove.

7. The multi-mode switching electro-hydraulic servo test system according to claim 1, characterized in that, An encoder is further included, the housing of the encoder is fixedly arranged on the frame body, and the encoder shaft of the encoder is coaxially and fixedly connected to the loading shaft.

8. The multi-mode switching electro-hydraulic servo test system according to claim 1, characterized in that, On the outer periphery of the loading shaft, a mounting plate with a thickness direction parallel to the axial direction of the loading shaft is fixedly arranged, and the first rocker arm and the second rocker arm are respectively arranged on both sides of the mounting plate.

9. The multi-mode switching electro-hydraulic servo test system according to claim 1, characterized in that, A guide seat is provided on the output end of the linear power output unit, a connecting rod is provided on the guide seat, an end of the connecting rod away from the guide seat is hinged to the second rocker arm, and a limit assembly is operably provided on the guide seat, and the limit assembly can selectively limit the sliding of the connecting rod.

10. The multi-mode switching electro-hydraulic servo test system according to claim 9, characterized in that, The guide seat is provided with a first guide hole with a square cross-section, the connecting rod can be slidably inserted into the first guide hole, and the side wall of the first guide hole is provided with a through hole, and the connecting rod is provided with a limiting column passing through the through hole; the limiting assembly includes a second motor, a cam, a clamping block and an elastic member, the second motor is fixed on the guide seat, the cam is fixedly sleeved on the motor shaft of the motor, the clamping block can slide on the guide seat in a direction perpendicular to the axial direction of the first guide hole, and the clamping block is provided with a clamping groove; the clamping block can be pushed by the cam to make the limiting column clamped in the clamping groove, and the clamping block can be pushed by the elastic member to make the limiting column escape from the clamping groove.

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