Servo valve dynamic and static performance test bench

Abstract

The invention relates to the technical field of servo valve dynamic and static performance tests, in particular to a servo valve dynamic and static performance test bed which comprises a test bed body, a fixing mechanism, a servo valve static tester, a servo valve dynamic tester, a transverse adjusting mechanism, a longitudinal adjusting mechanism, a height adjusting mechanism, a placement table, a stepping motor and multiple sets of limiting pieces. A driving gear is arranged at the output end of the stepping motor, the limiting piece is composed of two limiting rods, the fixing mechanism comprises a plurality of clamping assemblies and a rotating disc, each clamping assembly comprises a movable screw rod, a threaded sleeve, a clamping pad, a limiting plate, two abutting rings, an auxiliary gear, a plurality of racks and a driven gear, the auxiliary gears in the multiple clamping assemblies are driven through the multiple racks, and the rotating disc is arranged on the rotating disc. And the threaded sleeve is in threaded connection with the movable screw rod, and the movable screw rod pushes the clamping pad to fix the servo valve, so that the effects of quick disassembly and assembly can be achieved, the operation process is extremely simple, and the test progress is further improved.

Description

Technical Field

[0001] The invention relates to the technical field of dynamic and static performance testing of servo valves, and in particular to a dynamic and static performance testing platform for servo valves. Background Art

[0002] The dynamic and static performance tests of servo valves are designed to comprehensively evaluate the working status and control effect of servo valves under different working conditions, including their static performance and dynamic performance. The static performance mainly focuses on the basic working parameters of the servo valve without dynamic changes, such as input-output characteristics, leakage, dead zone, flow gain, etc.; while the dynamic performance mainly evaluates the response speed and stability of the servo valve under rapidly changing conditions, such as response time, frequency response, step response, etc. The servo valve is a key component in the electro-hydraulic servo control system, and its performance directly affects the stable operation and control accuracy of the entire system. Therefore, dynamic and static performance tests of servo valves are an important part of ensuring system reliability.

[0003] However, currently the servo valve needs to be fixed before testing, and the existing fixing method usually uses bolts, which are too time-consuming and labor-intensive to disassemble and install, thus affecting the progress of the test. Summary of the invention

[0004] The purpose of the present invention is to provide a servo valve dynamic and static performance test bench to solve the technical problem in the prior art that the servo valve needs to be fixed before testing, and the existing fixing method usually uses bolts, which is too time-consuming and labor-intensive to disassemble and install, thus affecting the progress of the test.

[0005] To achieve the above-mentioned purpose, the present invention provides a servo valve dynamic and static performance test bench, including a test bench body and a fixing mechanism, the test bench body is provided with a servo valve static tester and a servo valve dynamic tester, the test bench body is provided with an adjustment slot at the bottom, a lateral adjustment mechanism is provided in the adjustment slot, a longitudinal adjustment mechanism is provided on the lateral adjustment mechanism, a height adjustment mechanism is provided on the longitudinal adjustment mechanism, a placement table is rotatably provided on the height adjustment mechanism, the upper end surface of the placement plate is provided with a placement slot, a stepping motor and a plurality of groups of limit members are provided on the outer side of the placement plate, a driving gear is provided at the output end of the stepping motor, the limit member is composed of two limit rods, and the outer side of the placement plate has a plurality of rotating The rotating groove, the fixing mechanism includes a plurality of clamping assemblies and a rotating disk, the clamping assembly includes a moving screw and a threaded sleeve, a clamping pad is provided at one end of the moving screw, a limiting plate is provided at the other end of the screw, two abutting rings and an auxiliary gear are provided on the threaded sleeve, a plurality of racks are provided on the lower end surface of the rotating disk, a driven gear is provided on the outer side of the rotating disk, the moving screw is threadedly arranged in the threaded sleeve, the threaded sleeve is rotatably arranged in the corresponding rotating groove, the limiting plate is slidably arranged on the corresponding two limiting rods, the rotating disk is rotatably connected to the placing disk and is sleeved on the placing disk, and the auxiliary gear is meshed with the corresponding rack, and the driving gear is meshed with the driven gear.

[0006] Wherein, a plurality of racks are arranged in a ring shape below the rotating disk.

[0007] Wherein, a plurality of the limiting members are respectively arranged on the outer side of the placing platform in a cross-symmetrical manner.

[0008] Among them, the lateral adjustment mechanism includes two lateral screws and a lateral moving seat, one end of the two lateral screws is connected by a linkage assembly, and one of the lateral screws is driven by a rotating motor, both ends of the lateral moving seat have lateral thread grooves, the two lateral screws are respectively rotatably connected to the test bench body and are located in the adjustment grooves, the two lateral screws are also respectively threadedly connected to the lateral moving seat and are located in the corresponding lateral thread grooves, the lateral moving seat is slidably arranged in the adjustment groove, and the longitudinal adjustment mechanism is arranged on the lateral moving seat.

[0009] Wherein, the linkage assembly includes two pulleys, a belt body and a protective cover, the two pulleys are respectively fixedly connected to the corresponding transverse screws and are located at one end of the transverse screws, the belt body is transmission-connected to the corresponding pulleys and is sleeved on the two pulleys, the protective cover is fixedly connected to the test bench body and is located at one end of the test bench body, and also covers the belt body and the two pulleys.

[0010] In which, the longitudinal adjustment mechanism includes a longitudinal movable seat, an electric telescopic rod and a fixed frame, the inner side of the adjustment groove has a through hole, the longitudinal movable seat is slidably connected to the fixed frame, and is located on the inner side of the fixed frame, and is also abutted against the top of the transverse movable seat, the longitudinal movable seat is also fixedly connected to the electric telescopic rod, and is located at the output end of the electric telescopic rod, the height adjustment mechanism is arranged below the longitudinal movable seat, and also extends out of the upper end surface of the longitudinal movable seat, the electric telescopic rod is fixedly connected to the fixed frame, and is located at one end of the fixed frame, the fixed frame is fixedly connected to the transverse movable seat, and is located on the transverse movable seat, and also extends to the through hole.

[0011] Among them, the height adjustment mechanism includes an electric push rod and a cross block, the transverse moving seat has a cross groove, the electric push rod is fixedly connected to the cross block and is located below the cross block, the cross block is fixedly connected to the longitudinal moving seat and is located below the longitudinal moving seat, and the output end of the electric push rod extends to above the cross block and the longitudinal moving seat, the placement table is rotatably set at the output end of the electric push rod, the cross block is slidably connected to the transverse moving seat and is located in the cross groove.

[0012] A servo valve dynamic and static performance test bench of the present invention comprises a test bench body, a fixing mechanism, a servo valve static tester, a servo valve dynamic tester, a lateral adjustment mechanism, a longitudinal adjustment mechanism, a height adjustment mechanism, a placement table, a stepper motor and a plurality of groups of limit members, wherein the output end of the stepper motor is provided with a driving gear, the limit member is composed of two limit rods, the outer side of the placement plate has a plurality of rotating grooves, the fixing mechanism comprises a plurality of clamping assemblies and a rotating disk, the clamping assembly comprises a moving screw and a threaded sleeve, one end of the moving screw is provided with a clamping pad, the other end of the screw is provided with a limit plate, and the threaded sleeve is provided with two abutting rings and auxiliary gears Wheel, a plurality of racks are arranged on the lower end surface of the turntable, a driven gear is arranged on the outer side of the turntable, and the auxiliary gears in the plurality of clamping assemblies are driven by the plurality of racks, so that the threaded sleeve is threadedly connected with the moving screw, and the moving screw pushes the clamping pad to fix the servo valve, thereby achieving the effect of quick disassembly and installation, and the operation process is extremely simple, thereby improving the progress of the test, and effectively solving the technical problem that the servo valve needs to be fixed before being tested, and the existing fixing method usually uses bolts, and the disassembly and installation of this fixing method is too time-consuming and labor-intensive, thereby affecting the progress of the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.

[0014] Figure 1 It is a three-dimensional stereogram of the first embodiment of the present invention.

[0015] Figure 2 The present invention Figure 1 A partial enlarged view of point A in the middle.

[0016] Figure 3 It is a front view of the first embodiment of the present invention.

[0017] Figure 4 The present invention Figure 3 Cross-sectional view along line BB.

[0018] Figure 5 The present invention Figure 4 A partial enlarged view of point C in the middle.

[0019] Figure 6 It is a schematic structural diagram of a turntable and a plurality of auxiliary gears in the first embodiment of the present invention.

[0020] Figure 7 It is a front view of the second embodiment of the present invention.

[0021] Figure 8 The present invention Figure 7 Sectional view along line DD.

[0022] Fig. 9 The present invention Figure 7 Cross-sectional view along line EE.

[0023] Fig.10 The present invention Fig. 9 Cross-sectional view along line FF.

[0024] Fig.11 It is a three-dimensional stereogram of the third embodiment of the present invention.

[0025] Fig.12 is a side view of a third embodiment of the present invention.

[0026] Fig.13 The present invention Fig.12 A partial enlarged view of point G in the middle.

[0027] 101-test bench body, 102-servo valve static tester, 103-servo valve dynamic tester, 104-adjustment slot, 105-lateral adjustment mechanism, 106-longitudinal adjustment mechanism, 107-height adjustment mechanism, 108-placement table, 109-placement slot, 110-stepping motor, 111-driving gear, 112-limiting rod, 113-rotating slot, 114-turntable, 115-moving screw, 116-threaded sleeve, 117-clamping pad, 118-limiting plate, 119-holding ring, 120-auxiliary gear, 12 1- rack, 122- driven gear, 201- transverse screw, 202- transverse moving seat, 203- rotating motor, 204- transverse thread groove, 205- pulley, 206- belt body, 207- protective cover, 208- longitudinal moving seat, 209- electric telescopic rod, 210- fixed frame, 211- through hole, 212- electric push rod, 213- cross block, 214- cross groove, 301- support pad, 302- lifting plate, 303- hydraulic push rod, 304- extension rod, 305- hydraulic cylinder, 306- supporting seat. DETAILED DESCRIPTION

[0028] Embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, but should not be construed as limiting the present invention.

[0029] First embodiment:

[0030] See also Figure 1 to Figure 6 ,in Figure 1 is a three-dimensional stereogram of the first embodiment of the present invention, Figure 2 The present invention Figure 1 A partial enlarged view of the middle A. Figure 3 is a front view of a first embodiment of the present invention, Figure 4 The present invention Figure 3 The cross-sectional view of the BB line. Figure 5 The present invention Figure 4 A partial enlarged view of point C in the middle. Figure 6 It is a schematic structural diagram of a turntable and a plurality of auxiliary gears in the first embodiment of the present invention.

[0031] The present invention provides a servo valve dynamic and static performance test bench, comprising a test bench body 101 and a fixing mechanism, wherein the test bench body 101 is provided with a servo valve static tester 102 and a servo valve dynamic tester 103, an adjustment slot 104 is provided below the test bench body 101, a lateral adjustment mechanism 105 is provided in the adjustment slot 104, a longitudinal adjustment mechanism 106 is provided on the lateral adjustment mechanism 105, a height adjustment mechanism 107 is provided on the longitudinal adjustment mechanism 106, a placement table 108 is rotatably provided on the height adjustment mechanism 107, a placement slot 109 is provided on the upper end surface of the placement plate, a stepping motor 110 and a plurality of limit members are provided on the outer side of the placement plate, and an active gear is provided at the output end of the stepping motor 110 Wheel 111, the limit member is composed of two limit rods 112, and the outer side of the placement plate has a plurality of rotating grooves 113. In order to meet the requirements of the performance test of the servo valve, the present design adopts a combination of a servo motor and a metering pump as the power source of the servo valve test bench. The metering pump is connected to the servo motor through a coupling. A rotary encoder is provided at the rear end of the servo motor to accurately detect the rotation angle of the servo motor. The servo motor is connected to a servo driver, and the servo driver realizes closed-loop control of the speed of the servo motor. The method of the present design for dynamic and static performance test of the servo valve is the prior art, and the servo valve static tester 102 and the servo valve dynamic tester 103 are both existing mature technologies, so their structures and working principles are not described in detail here.

[0032] According to this specific embodiment, the fixing mechanism includes a plurality of clamping components and a turntable 114, the clamping component includes a moving screw 115 and a threaded sleeve 116, one end of the moving screw 115 is provided with a clamping pad 117, the other end of the screw is provided with a limiting plate 118, the threaded sleeve 116 is provided with two abutting rings 119 and an auxiliary gear 120, the lower end surface of the turntable 114 is provided with a plurality of racks 121, the outer side of the turntable 114 is provided with a driven gear 122, the moving screw 115 is threadedly arranged in the threaded sleeve 116, the threaded sleeve 116 is rotatably arranged in the corresponding rotating groove 113, the limiting plate 118 is slidably arranged on the corresponding two limiting rods 112, and the turntable 114 is rotatably connected to the placement plate , and is sleeved on the placement plate, and the auxiliary gear 120 is meshed with the corresponding rack 121, the driving gear 111 is meshed with the driven gear 122, and the auxiliary gears 120 in the multiple clamping assemblies are transmitted through the multiple racks 121, so that the threaded sleeve 116 is threadedly connected with the moving screw 115, and the moving screw 115 pushes the clamping pad 117 to fix the servo valve, thereby achieving the effect of rapid disassembly and installation, and the operation process is extremely simple, thereby improving the progress of the test, and in this way effectively solves the current need to fix the servo valve before testing it, and the existing fixing method usually uses bolts, and the disassembly and installation of this fixing method is too time-consuming and labor-intensive, thereby affecting the technical problem of the progress of the test.

[0033] The plurality of racks 121 are disposed in a ring shape below the rotating disk 114 .

[0034] Secondly, the plurality of limit members are respectively arranged on the outer side of the placement platform 108 in a cross-symmetrical manner.

[0035] When using a servo valve dynamic and static performance test bench of this embodiment, by starting the stepper motor 110, the driving gear 111 drives the driven gear 122 clockwise, and the turntable 114 rotates under the action of the driven gear 122, and the multiple racks 121 drive the auxiliary gears 120 in the multiple clamping assemblies, so that the threaded sleeve 116 rotates under the action of the two abutting rings 119, and the moving screw 115 pushes the clamping pad 117 to abut the outside of the servo valve under the action of the limit rod 112 and the limit plate 118, and fast fixing is achieved under the action of the multiple clamping assemblies. The faster fixing and disassembly speed of this design means that the test can be carried out faster, thereby shortening the entire test cycle and improving the test efficiency. In this way, the technical problem that the servo valve needs to be fixed before testing, and the existing fixing method usually uses bolts, and the disassembly and installation of this fixing method is too time-consuming and labor-intensive, thereby affecting the progress of the test, is effectively solved.

[0036] In the present invention, when the dynamic performance test of the servo valve is carried out, the flow / pressure output end of the quantitative pump is connected to the flow / pressure input end of the dynamic test cylinder through the shut-off valve via the parallel regulating overflow valve, and the flow / pressure output end of the dynamic test cylinder is connected to the oil tank through the shut-off valve, and its oil circuit is connected with a pressure sensor and a digital display, and the control pressure required by the tested servo valve product is achieved by adjusting the overflow valve, and the control pressure is read and measured by the pressure sensor and the digital display; the tested servo valve is installed on the dynamic test cylinder; the electrical signal of the tested servo valve is connected to the servo valve dynamic tester 103, the servo valve dynamic tester 103 is connected to the frequency characteristic analyzer or the computer and the measurement and control software, the position signal output end of the dynamic test cylinder is connected to the servo valve dynamic tester 103, and the servo valve dynamic tester 103 and the frequency characteristic analyzer or the computer and the measurement and control software are connected in a two-way signal transmission manner.

[0037] In the present invention, when the dynamic performance test of the servo valve is carried out, the test control oil circuit is switched to the dynamic test cylinder through the stop valve, and a sweep frequency signal is sent by a frequency characteristic analyzer or a computer and measurement and control software, which is output to the servo valve under test through the dynamic tester, and drives the dynamic test cylinder, and its position signal is fed back to the dynamic tester to form a control closed loop, and the speed signal is fed back to the frequency characteristic analyzer or the computer measurement and control software for collection, analysis, calculation and drawing.

[0038] Second embodiment:

[0039] Based on the first embodiment, please refer to Figure 7 to Figure 10 ,in Figure 7 is a front view of a second embodiment of the present invention, Figure 8 The present invention Figure 7 The cross-sectional view of the DD line, Fig. 9 The present invention Figure 7 The cross-sectional view of the EE line, Fig.10 The present invention Fig. 9 Cross-sectional view along line FF.

[0040] The present invention provides a servo valve dynamic and static performance test bench, wherein the lateral adjustment mechanism 105 comprises two lateral screws 201 and a lateral moving seat 202, one end of the two lateral screws 201 is connected by a linkage assembly, and one of the lateral screws 201 is driven by a rotating motor 203, and both ends of the lateral moving seat 202 have lateral thread grooves 204, the two lateral screws 201 are respectively rotatably connected to the test bench body 101 and are located in the adjustment grooves 104, and the two lateral screws 201 are also respectively threadedly connected to the lateral moving seat 202. The lateral movable seat 202 is slidably arranged in the adjusting groove 104, and the longitudinal adjusting mechanism 106 is arranged on the lateral movable seat 202. By starting the rotating motor 203, the rotating motor 203 drives one of the lateral screw rods 201 to rotate, and the other lateral screw rod 201 rotates under the action of the linkage assembly, so that the lateral movable seat 202 can move laterally in the adjusting groove 104, and then the placement table 108 is adjusted to a suitable position.

[0041] Among them, the linkage assembly includes two pulleys 205, a belt body 206 and a protective cover 207. The two pulleys 205 are respectively fixedly connected to the corresponding transverse screw 201 and are located at one end of the transverse screw 201. The belt body 206 is transmission-connected to the corresponding pulley 205 and is sleeved on the two pulleys 205. The protective cover 207 is fixedly connected to the test bench body 101 and is located at one end of the test bench body 101, and also covers the belt body 206 and the two pulleys 205. The two pulleys 205 are transmitted through the belt body 206, thereby realizing the linkage of the two transverse screws 201. The protective cover 207 can facilitate the protection of the pulley 205 and the belt body 206.

[0042] Secondly, the longitudinal adjustment mechanism 106 includes a longitudinal moving seat 208, an electric telescopic rod 209 and a fixed frame 210. The inner side of the adjustment slot 104 has a through hole 211. The longitudinal moving seat 208 is slidably connected with the fixed frame 210 and is located on the inner side of the fixed frame 210, and is also supported on the upper side of the lateral moving seat 202. The longitudinal moving seat 208 is also fixedly connected with the electric telescopic rod 209 and is located at the output end of the electric telescopic rod 209. The height adjustment mechanism 107 is arranged below the longitudinal moving seat 208 and also extends out of the On the upper end surface of the longitudinal movable seat 208, the electric telescopic rod 209 is fixedly connected to the fixed frame 210 and is located at one end of the fixed frame 210. The fixed frame 210 is fixedly connected to the transverse movable seat 202 and is located on the transverse movable seat 202, and also extends to the through hole 211. By starting the electric telescopic rod 209, the longitudinal movable seat 208 is longitudinally moved in the fixed frame 210, thereby adjusting the longitudinal distance of the placement table 108, and further making the servo valve on the placement table 108 closer to the position to be tested.

[0043] At the same time, the height adjustment mechanism 107 includes an electric push rod 212 and a cross block 213. The transverse moving seat 202 has a cross groove 214. The electric push rod 212 is fixedly connected to the cross block 213 and is located below the cross block 213. The cross block 213 is fixedly connected to the longitudinal moving seat 208 and is located below the longitudinal moving seat 208. The output end of the electric push rod 212 extends to the top of the cross block 213 and the longitudinal moving seat 208. The placement table 108 is rotatably set at the output end of the electric push rod 212. The cross block 213 is slidably connected to the transverse moving seat 202 and is located in the cross groove 214. By starting the electric push rod 212, the electric push rod 212 pushes the placement table 108 upward to achieve height adjustment of the placement table 108, thereby adapting to the testing of servo valves of different sizes.

[0044] When using a servo valve dynamic and static performance test bench of this embodiment, by starting the rotating motor 203, the rotating motor 203 drives one of the transverse screws 201 to rotate, and the other transverse screw 201 rotates under the action of the linkage assembly, so that the transverse moving seat 202 can move transversely in the adjustment groove 104, and then the placement table 108 is adjusted to a suitable position, and the belt body 206 drives the two pulleys 205, so as to realize the linkage of the two transverse screws 201, and the protective The cover 207 can be used to protect the pulley 205 and the belt body 206. The electric telescopic rod 209 is started to make the longitudinal movable seat 208 move longitudinally in the fixed frame 210, so as to adjust the longitudinal distance of the placement table 108, so as to make the servo valve on the placement table 108 closer to the position to be tested. The electric push rod 212 is started to push the placement table 108 upward to adjust the height of the placement table 108, so as to adapt to the testing of servo valves of different sizes.

[0045] Third embodiment:

[0046] Based on the second embodiment, please refer to Figure 11 to Figure 13 ,in Fig.11 is a three-dimensional stereogram of a third embodiment of the present invention, Fig.12 is a side view of a third embodiment of the present invention, Fig.13 The present invention Fig.12 A partial enlarged view of point G in the middle.

[0047] The present invention provides a servo valve dynamic and static performance test bench, which also includes two abutment components and a lifting mechanism. The two abutment components are arranged below the placement table 108 and also abut against the output end of the electric push rod 212. The lifting mechanism is arranged below the test bench body 101.

[0048] Among them, the supporting assembly includes a supporting pad 301, a lifting plate 302 and a hydraulic push rod 303. The supporting pad 301 is fixedly connected to the hydraulic push rod 303 and is located at the output end of the hydraulic push rod 303, and is also supported by the height adjustment mechanism 107. The lifting plate 302 is fixedly connected to the placement table 108 and is located below the placement table 108, and is also sleeved on the output end of the hydraulic push rod 303. The hydraulic push rod 303 is fixedly connected to the placement table 108 and is located below the placement table 108. By starting the hydraulic push rod 303, the hydraulic push rod 303 pushes the supporting pad 301 to contact the output shaft of the electric push rod 212, thereby preventing the placement table 108 from rotating. When the supporting pad 301 is away from the output shaft of the electric push rod 212, the placement table 108 can be rotated arbitrarily and then adjusted to a suitable angle.

[0049] Secondly, the lifting mechanism includes four extension rods 304, two hydraulic cylinders 305 and a support seat 306. The four extension rods 304 are respectively fixedly connected to the test bench body 101 and are located below the test bench body 101. The two hydraulic cylinders 305 are respectively fixedly connected to the support seats 306 and are located in the support seats 306. The test bench body 101 is fixedly connected to the corresponding hydraulic cylinders 305 and is located at the output ends of the two hydraulic cylinders 305. The four extension rods 304 are respectively extended into the support seats 306. The support seats 306 are located below the test bench body 101. By starting the hydraulic cylinders 305, the hydraulic cylinders 305 push the test bench body 101 upward, thereby realizing the lifting of the test bench, which is suitable for different user groups.

[0050] When using a servo valve dynamic and static performance test bench of the present embodiment, the hydraulic push rod 303 is started to push the supporting pad 301 to resist the output shaft of the electric push rod 212, thereby preventing the placement table 108 from rotating. When the supporting pad 301 is away from the output shaft of the electric push rod 212, the placement table 108 can be rotated arbitrarily and then adjusted to a suitable angle. The hydraulic cylinder 305 is started to push the hydraulic cylinder 305 upward to push the test bench body 101, thereby realizing the lifting and lowering of the test bench, which is suitable for different users.

[0051] What is disclosed above is only one or more preferred embodiments of the present application, and cannot be used to limit the scope of rights of the present application. Ordinary technicians in this field can understand that all or part of the processes of implementing the above embodiments and equivalent changes made according to the claims of the present application are still within the scope covered by the present application.

Claims

1. A servo valve dynamic and static performance test bench, comprising a test bench body, on which a servo valve static tester and a servo valve dynamic tester are arranged, an adjustment slot is arranged at the bottom of the test bench body, a lateral adjustment mechanism is arranged in the adjustment slot, a longitudinal adjustment mechanism is arranged on the lateral adjustment mechanism, a height adjustment mechanism is arranged on the longitudinal adjustment mechanism, a placement table is rotatably arranged on the height adjustment mechanism, the upper end surface of the placement plate has a placement slot, a stepper motor and multiple groups of limit members are arranged on the outer side of the placement plate, a driving gear is arranged at the output end of the stepper motor, the limit member is composed of two limit rods, and the outer side of the placement plate has multiple rotating slots, characterized in that, Also includes a fixing mechanism; The fixing mechanism includes a plurality of clamping assemblies and a turntable, the clamping assembly includes a moving screw and a threaded sleeve, a clamping pad is provided at one end of the moving screw, a limiting plate is provided at the other end of the screw, two supporting rings and an auxiliary gear are provided on the threaded sleeve, a plurality of racks are provided on the lower end surface of the turntable, a driven gear is provided on the outer side of the turntable, the moving screw is threadedly provided in the threaded sleeve, the threaded sleeve is rotatably provided in the corresponding rotating groove, the limiting plate is slidably provided on the corresponding two limiting rods, the turntable is rotatably connected to the placement disk and sleeved on the placement disk, the auxiliary gear is meshed with the corresponding rack, and the driving gear is meshed with the driven gear.

2. The servo valve dynamic and static performance test bench according to claim 1, characterized in that: The plurality of racks are arranged in a ring shape below the rotating disk.

3. The servo valve dynamic and static performance test bench according to claim 2, characterized in that: The plurality of limit members are respectively arranged on the outer side of the placement platform in a cross-symmetrical manner.

4. The servo valve dynamic and static performance test bench according to claim 3, characterized in that: The transverse adjustment mechanism includes two transverse screws and a transverse moving seat, one end of the two transverse screws is connected by a linkage assembly, and one of the transverse screws is driven by a rotating motor, both ends of the transverse moving seat have transverse thread grooves, the two transverse screws are respectively rotatably connected to the test bench body and are located in the adjustment grooves, the two transverse screws are also respectively threadedly connected to the transverse moving seat and are located in the corresponding transverse thread grooves, the transverse moving seat is slidably arranged in the adjustment groove, and the longitudinal adjustment mechanism is arranged on the transverse moving seat.

5. The servo valve dynamic and static performance test bench according to claim 4, characterized in that: The linkage assembly includes two pulleys, a belt body and a protective cover. The two pulleys are respectively fixedly connected to the corresponding transverse screws and are located at one end of the transverse screws. The belt body is transmission-connected to the corresponding pulleys and is sleeved on the two pulleys. The protective cover is fixedly connected to the test bench body and is located at one end of the test bench body, and also covers the belt body and the two pulleys.

6. The servo valve dynamic and static performance test bench according to claim 5, characterized in that: The longitudinal adjustment mechanism includes a longitudinal movable seat, an electric telescopic rod and a fixed frame. The inner side of the adjustment groove is provided with a through hole. The longitudinal movable seat is slidably connected to the fixed frame and is located on the inner side of the fixed frame, and is also abutted against the top of the transverse movable seat. The longitudinal movable seat is also fixedly connected to the electric telescopic rod and is located at the output end of the electric telescopic rod. The height adjustment mechanism is arranged below the longitudinal movable seat and also extends out of the upper end surface of the longitudinal movable seat. The electric telescopic rod is fixedly connected to the fixed frame and is located at one end of the fixed frame. The fixed frame is fixedly connected to the transverse movable seat and is located on the transverse movable seat and also extends to the through hole.

7. The servo valve dynamic and static performance test bench according to claim 6, characterized in that: The height adjustment mechanism includes an electric push rod and a cross block, a cross groove is provided in the transverse moving seat, the electric push rod is fixedly connected to the cross block and is located below the cross block, the cross block is fixedly connected to the longitudinal moving seat and is located below the longitudinal moving seat, and the output end of the electric push rod extends to above the cross block and the longitudinal moving seat, the placing platform is rotatably arranged at the output end of the electric push rod, the cross block is slidably connected to the transverse moving seat and is located in the cross groove.

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