High-frequency fatigue testing machine applying magnetic axis type linear motor

Abstract

The invention discloses a high-frequency fatigue testing machine applying a magnetic axis type linear motor, and relates to the technical field of linear motor fatigue testing. The device comprises a test bench, a clamping mechanism, a dynamic load part and a load angle adjusting structure. The clamping electric cylinder drives the spline sliding rod to clamp and fix the motor, and the motor does not need to be disassembled. According to the dynamic load part, a load adjusting motor drives a rotating base and a centrifugal power pull rod, variable load is achieved by combining the centrifugal effect of a balancing weight, and the variable load is transmitted to an actuating rod through a load rope. The load angle adjusting electric cylinder can change the stress direction of the actuating rod, so that multi-angle loading is realized. According to the device, a dynamic adjustable load can be applied in real time in the operation process of the motor, aging data are synchronously collected through a temperature sensor and an electrical monitoring means, and multi-dimensional evaluation of motor fatigue is achieved. The device has the advantages of controllable load, adjustable direction, non-destructive installation, real working condition simulation and the like, and is suitable for testing the service life and the fatigue performance of the magnetic axis type linear motor.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of linear motor fatigue tests, in particular to a high-frequency fatigue testing machine using a magnetic shaft type linear motor. BACKGROUND

[0002] The existing magnetic shaft type linear motor fatigue testing device has the following disadvantages: first, most of the devices rely on traditional fixed counterweights or spring loading methods, the load size is single and cannot be adjusted in real time, it is difficult to simulate complex dynamic working conditions, and the authenticity of the test results is insufficient. Secondly, most of the existing equipment can only realize single-direction loading, the test results are limited to specific stress scenarios, and the fatigue characteristics of the motor under multi-angle and multi-directional stress in actual use cannot be reflected. Thirdly, the traditional method often needs to disassemble or modify the motor to be tested, and the load mechanism is directly fixed with the actuating rod or the shell, which is complicated to operate and easy to cause damage to the motor, increasing the test uncertainty. Finally, the load in the test process is mostly static or linearly changed, lacking complex non-constant load simulation, and it is difficult to comprehensively evaluate the real fatigue life of the motor. SUMMARY

[0003] In order to overcome the defects of the prior art, the application provides the following technical scheme: a high-frequency fatigue testing machine using a magnetic shaft type linear motor, comprising a test table, two symmetrical and parallel side supports are fixedly installed on the test table, a cross beam plate is fixedly installed at the top between the two side supports, two support arm plates are fixedly installed on the cross beam plate, a clamping spline slide rod is rotatably and slidably installed on each support arm plate, a clamping plate is fixedly installed at the opposite end of each clamping spline slide rod, a rubber layer is arranged between the opposite surfaces of the two clamping plates for increasing the frictional resistance with the shell of the magnetic shaft type linear motor; a dynamic load part is further arranged between the two side supports, and the dynamic load part is used for applying a load that can be changed in fact to the actuating rod of the magnetic shaft type linear motor.

[0004] Preferably, the dynamic load part comprises a load support plate fixedly connected with the side support, a plurality of parallel support ring guide slide rods are fixedly installed at the circumferential position of the lower surface of the load support plate, a support ring is slidably and sleevedly installed on all the support ring guide slide rods, an embedded rotary ring is rotatably embedded on the inner side of the support ring, a synchronous guide slide rod center fixed block is arranged at the center position of the embedded rotary ring, and the synchronous guide slide rod center fixed block is fixedly connected with the embedded rotary ring through a plurality of synchronous guide slide rods arranged in the radial direction of the embedded rotary ring.

[0005] Preferably, a counterweight block mounting sleeve is slidably sleeved on each synchronous guide slide rod, and a counterweight block is fixedly installed on the counterweight block mounting sleeve in a detachable manner. According to different load requirement ranges, counterweight blocks of different masses are replaced.

[0006] Preferably, the load support plate is fixedly provided with a load adjusting motor, and two pull rod guide sliding rods are fixedly arranged on the load support plate in parallel, a pull rod is slidably sleeved on the two pull rod guide sliding rods, a rotating seat is fixedly arranged on the output shaft of the load adjusting motor and the pull rod, the two rotating seats are coaxially arranged, the same number of centrifugal power pull rods as the synchronous guide sliding rods are movably connected to each rotating seat, and the opposite ends of each pair of centrifugal power pull rods on the two rotating seats are movably connected through a counterweight mounting sleeve. The rotating seat and the pull rod can only rotate circumferentially and cannot move axially.

[0007] Preferably, the upper surface of the test bench is fixedly provided with two deflection roller supports, the two deflection roller supports are arranged immediately below the magnetic shaft type linear motor and the rotating seat respectively, a deflection roller is rotatably arranged on each deflection roller support, the two deflection rollers are drivingly connected through a load rope, one end of the load rope is fixedly connected with the pull rod, the other end of the load rope is fixedly provided with a load rope connecting block, the load rope connecting block is fixedly matched with the actuating rod of the magnetic shaft type linear motor (the load rope connecting block is sleeved on the end portion of the actuating rod of the magnetic shaft type linear motor, and a screw rod is screwed into the load rope connecting block in the radial direction of the load rope connecting block, and the load rope connecting block and the actuating rod of the magnetic shaft type linear motor are fixed by rotating the screw rod).

[0008] Preferably, two symmetrically arranged load angle adjusting electric cylinders are movably arranged on the cross beam plate, the telescopic cylinder end portions of the two load angle adjusting electric cylinders are movably connected with the cross beam plate, load angle adjusting swing arms are movably connected to the telescopic rod end portions of the two load angle adjusting electric cylinders, the two load angle adjusting swing arms are respectively sleeved on the two clamping spline sliding rods in a spline sliding manner, and the load angle adjusting swing arms are rotatably matched with the support arm plate. The load angle adjusting swing arm and the support arm plate can only rotate circumferentially and cannot move circumferentially.

[0009] Preferably, a clamping electric cylinder is fixedly arranged on the cross beam plate, and a clamping force transmission sleeve is rotatably arranged at the end of each clamping spline sliding rod away from the clamping plate, and the clamping force transmission sleeves are movably connected with the telescopic rod end portions of the clamping electric cylinder through a clamping pull rod. The clamping force transmission sleeve and the clamping spline sliding rod can only rotate circumferentially and cannot move axially.

[0010] Compared with the prior art, the present application has the following beneficial effects: (1) The present application realizes dynamic load adjustment based on rotation speed and counterweight mass through the coordinated structure of load adjustment motor, rotating seat, centrifugal power pull rod and counterweight block mounted sliding sleeve. Compared with the traditional single fixed counterweight mode, the force of the magnetic shaft type linear motor actuator rod can be changed in real time according to experimental requirements, so that different working conditions can be simulated in different test stages, and the flexibility and applicability of the testing machine are significantly improved; (2) The present application can change the included angle between the actuator rod axis and the test bench through the cooperation of the load angle adjustment electric cylinder and the load angle adjustment swing arm, so as to flexibly adjust the load direction. This mode avoids the defects that the traditional device can only be stretched or compressed in one direction, so that the same equipment can complete multi-angle and multi-direction fatigue tests, greatly expanding the application range; (3) The present application fixes the magnetic shaft type linear motor through the clamping mode of the clamping plate and the clamping electric cylinder, without the need to disassemble or modify the motor for direct testing. In the entire experimental process, the motor always maintains the complete structure, avoiding the damage of the equipment caused by repeated installation or modification in the traditional method, reducing the test preparation time and improving the test efficiency; (4) The present application uses the method of dynamic driving of the counterweight block along the sliding rod by centrifugal force, so that the load presents a non-constant and changing trend with the reciprocating movement of the motor, which can better simulate the complex dynamic load condition of the motor in actual application. Compared with the traditional static load or single fixed load mode, the experimental results provided by the present application are closer to the fatigue performance of the motor in the actual use environment. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 It is a schematic diagram of the overall structure of the present application.

[0012] Figure 2 It is a schematic diagram of the structure of A in the present application. Figure 1

[0013] Figure 3 It is a schematic diagram of the structure of B in the present application. Figure 1

[0014] Figure 4 It is a schematic diagram of the structure of C in the present application. Figure 1

[0015] Figure 5 It is a schematic diagram of the structure of the clamping force transmission sleeve of the present application.

[0016] Figure 6 It is a schematic diagram of the structure of the clamping plate of the present application.

[0017] ​​​In the figure: 101-test bench; 102- deflection roller support; 103- deflection roller; 104- side support; 105- load support plate; 106- support ring guide slide; 107- pull rod guide slide; 108- pull rod; 109- load adjustment motor; 110- cross beam plate; 111- support arm plate; 112- clamping electric cylinder; 113- rotating seat; 114- centrifugal power pull rod; 115- support ring; 116- embedded rotating ring; 117- synchronous guide slide; 118- synchronous guide slide center fixed block; 119- counterweight block mounting slide sleeve; 120- load angle adjustment electric cylinder; 121- clamping pull rod; 122- clamping force transmission sleeve; 123- clamping spline slide; 124- load angle adjustment swing arm; 125- clamping plate; 126- load rope connecting block; 127- load rope. DETAILED DESCRIPTION

[0018] The technical solutions of the present application will be further described below in combination with the accompanying drawings. Figures 1-6 The technical solutions of the present application will be further described below in combination with the accompanying drawings.

[0019] The application provides a high-frequency fatigue testing machine using a magnetic shaft type linear motor, which comprises a test table 101, two symmetric and parallel side supports 104 fixedly installed on the test table 101, a cross beam plate 110 fixedly installed at the top between the two side supports 104, two support arm plates 111 fixedly installed on the cross beam plate 110, a clamping spline slide rod 123 rotatably and slidably installed on each support arm plate 111, a clamping plate 125 fixedly installed at the opposite end of each clamping spline slide rod 123, and a rubber layer arranged between the opposite surfaces of the two clamping plates 125 for increasing the frictional resistance with the shell of the magnetic shaft type linear motor. A dynamic load part is further arranged between the two side supports 104, and the dynamic load part is used for applying a load that can be changed in fact to the actuator rod of the magnetic shaft type linear motor. The dynamic load part comprises a load support plate 105 fixedly connected with the side support 104, a plurality of parallel support ring guide slide rods 106 fixedly installed at the circumferential position of the lower surface of the load support plate 105, a support ring 115 slidably and sleevedly installed on all the support ring guide slide rods 106, an embedded rotary ring 116 rotatably embedded at the inner side of the support ring 115, a synchronous guide slide rod center fixed block 118 arranged at the center position of the embedded rotary ring 116, and a plurality of synchronous guide slide rods 117 fixedly connected between the embedded rotary ring 116 and the synchronous guide slide rod center fixed block 118 and arranged in the radial direction of the embedded rotary ring 116. A counterweight block mounting sleeve 119 is slidably and sleevedly arranged on each synchronous guide slide rod 117, and a counterweight block is fixedly installed on the counterweight block mounting sleeve 119 in a detachable manner. According to different load requirement ranges, counterweight blocks with different masses are replaced. A load adjusting motor 109 is fixedly installed on the load support plate 105, two parallel pull rods 108 are slidably and sleevedly arranged on two pull rod guide slide rods 107 fixedly installed on the load support plate 105, a rotary seat 113 is fixedly installed on the output shaft of the load adjusting motor 109 and the pull rod 108, the two rotary seats 113 are coaxially arranged, the same number of centrifugal power pull rods 114 as the synchronous guide slide rods 117 are movably connected to each rotary seat 113, and the opposite ends of each pair of centrifugal power pull rods 114 on the two rotary seats 113 are movably connected through the counterweight block mounting sleeve 119. The rotary seat 113 and the pull rod 108 can only rotate in the circumferential direction and cannot move in the axial direction.

[0020] The upper surface of the test bench 101 is fixedly installed with two steering roller supports 102, which are respectively arranged directly below the magnetic shaft type linear motor and the rotating seat 113, and each of the steering roller supports 102 is rotatably installed with a steering roller 103, and the two steering rollers 103 are drivingly connected through a load rope 127, one end of the load rope 127 is fixedly connected with the lifting rod 108, and the other end of the load rope 127 is fixedly installed with a load rope connecting block 126, the load rope connecting block 126 is fixedly matched with the actuating rod of the magnetic shaft type linear motor (the load rope connecting block 126 is sleeved on the end portion of the actuating rod of the magnetic shaft type linear motor, and a screw rod is threadedly inserted in the radial direction of the load rope connecting block 126, and the load rope connecting block 126 is fixedly connected with the actuating rod of the magnetic shaft type linear motor by rotating the screw rod). The cross beam plate 110 is also movably installed with two symmetrically arranged load angle adjusting electric cylinders 120, the telescopic cylinder end portions of the two load angle adjusting electric cylinders 120 are movably connected with the cross beam plate 110, the telescopic rod end portions of the two load angle adjusting electric cylinders 120 are movably connected with load angle adjusting swing arms 124, the two load angle adjusting swing arms 124 are respectively sleeved on the two clamping spline sliding rods 123 in a spline sliding manner, and the load angle adjusting swing arms 124 are rotatably matched with the support arm plate 111. The load angle adjusting swing arms 124 and the support arm plate 111 can only rotate circumferentially and cannot circumferentially displace. The cross beam plate 110 is also fixedly installed with a clamping electric cylinder 112, one end of each of the two clamping spline sliding rods 123 away from the clamping plate 125 is rotatably installed with a clamping force transmission sleeve 122, and the two clamping force transmission sleeves 122 are movably connected with the telescopic rod end portions of the clamping electric cylinder 112 through clamping pull rods 121. The clamping force transmission sleeve 122 and the clamping spline sliding rod 123 can only rotate circumferentially and cannot axially displace.

[0021] The working principle of the high-frequency fatigue testing machine using the magnetic shaft type linear motor is as follows: the magnetic shaft type linear motor is placed between the two clamping plates 125, then the extension rod of the clamping cylinder 112 is controlled, the clamping cylinder 112 drives the two clamping force transmission sleeves 122 to move relatively through the clamping pull rod 121, the two clamping force transmission sleeves 122 drive the corresponding clamping spline sliding rods 123 to move synchronously, the two clamping spline sliding rods 123 drive the two clamping plates 125 to move relatively (at the same time, the clamping spline sliding rod 123 slides relatively with the load angle adjusting swing arm 124 and the support arm plate 111), so that the two clamping plates 125 can clamp the magnetic shaft type linear motor by controlling the extension rod of the clamping cylinder 112. By controlling the extension rod of the load angle adjusting cylinder 120 (the extension rods of the two load angle adjusting cylinders 120 are controlled synchronously and identically), the extension rod of the load angle adjusting cylinder 120 drives the load angle adjusting swing arm 124 to swing, the load angle adjusting swing arm 124 drives the clamping spline sliding rod 123 to swing (at the same time, the clamping spline sliding rod 123 rotates relatively with the support arm plate 111), and the clamping spline sliding rod 123 will drive the magnetic shaft type linear motor to swing through the clamping plate 125, so as to change the included angle between the actuating rod axis of the magnetic shaft type linear motor and the test bench 101, thereby changing the load direction of the actuating rod of the magnetic shaft type linear motor.

[0022] The actuator of the magnetic shaft linear motor reciprocates linearly. During testing, the magnetic shaft linear motor needs to be in operation, and a load needs to be applied to its actuator. One end of the load rope 127 is fixedly connected to the actuator of the magnetic shaft linear motor via the load rope connecting block 126. Then, the load regulating motor 109 is started. The output cycle of the load regulating motor 109 drives the corresponding rotating seat 113 to rotate. The rotating seat 113 drives another rotating seat 113 to rotate through all the centrifugal power connecting rods 114. At this time, both rotating seats 113 and all the centrifugal power connecting rods 114 are in rotation. When the system is in a rotating state, the counterweight mounting sleeve 119 between the centrifugal power pull rods 114 will also rotate. The rotation of the counterweight mounting sleeve 119 will drive the synchronous guide slide rod 117 to rotate, which in turn drives the embedded rotating ring 116 to rotate. Simultaneously, the rotation of the counterweight mounting sleeve 119 will cause it to slide along the synchronous guide slide rod 117 due to the magnitude of the centrifugal force (assuming the output shaft speed of the load regulating motor 109 remains constant, the magnitude of the centrifugal force depends on the mass of the installed counterweight). At this time, the counterweight mounting sleeve 119 will pull the two centrifugal power pull rods 114 to swing, causing the two centrifugal power pull rods 114 to swing. As rod 114 swings from a 180° angle towards an acute angle, the rotating seat 113 connected to lifting rod 108 is pulled up by centrifugal power rod 114, causing lifting rod 108 to slide upward along lifting rod guide slide 107 (to reset, simply stop load adjusting motor 109, and lifting rod 108 will fall to its lowest position under gravity). Simultaneously, relative sliding occurs between support ring 115 and support ring guide slide 106. The upward movement of lifting rod 108 pulls the actuator rod of the magnetic shaft linear motor downward via load rope 127, thus powering the magnetic shaft linear motor... The actuator of the motor applies a load. When the actuator of the magnetic shaft linear motor moves in the direction of overcoming the force of the load rope 127, it pulls the lifting rod 108 downward through the load rope 127. This, in turn, pulls the counterweight mounting sleeve 119 towards the synchronous guide rod center fixing block 118 via the centrifugal force pull rod 114. This pulling load depends on the sum of the centrifugal forces of all the counterweight mounting sleeves 119. Therefore, by adjusting the output shaft speed of the motor 109, the magnitude of the centrifugal force of all the counterweight mounting sleeves 119 can be controlled, thereby adjusting the load change of the magnetic shaft linear motor actuator. By installing a temperature sensor and detecting changes in the operating current and voltage of the magnetic shaft linear motor, the aging condition of the magnetic shaft linear motor can be monitored. Furthermore, by controlling the movement speed and load changes of the magnetic shaft linear motor actuator, the fatigue degree of the magnetic shaft linear motor under different speeds and loads can be tested. This eliminates the need to replace or disassemble the magnetic shaft linear motor. Furthermore, by adjusting the angle of the actuator rod of the magnetic shaft linear motor, the direction of the load applied to the actuator rod of the magnetic shaft linear motor can be changed.

Claims

1. A high-frequency fatigue testing machine using a magnetic shaft linear motor, comprising a test bench (101), on which two symmetrical and parallel side supports (104) are fixedly installed, characterized in that: A crossbeam plate (110) is fixedly installed at the top between the two side supports (104). Two support arm plates (111) are fixedly installed on the crossbeam plate (110). Each support arm plate (111) is rotatably and slidably equipped with a clamping spline slide rod (123). A clamping plate (125) is fixedly installed at the opposite ends of the two clamping spline slide rods (123). A rubber layer is provided between the opposite surfaces of the two clamping plates (125) to increase the frictional resistance with the housing of the magnetic shaft linear motor. A dynamic load section is also provided between the two side supports (104), which is used to apply a load that can be changed in fact to the actuator of the magnetic shaft linear motor.

2. The high-frequency fatigue testing machine using a magnetic shaft linear motor according to claim 1, characterized in that: The dynamic load section includes a load support plate (105) fixedly connected to a side bracket (104). Multiple parallel support ring guide slides (106) are fixedly installed on the circumference of the lower surface of the load support plate (105). Support rings (115) are slidably sleeved on all the support ring guide slides (106). An embedded rotating ring (116) is rotatably embedded on the inner side of the support ring (115). A synchronous guide slide center fixing block (118) is provided at the center of the embedded rotating ring (116). The synchronous guide slide center fixing block (118) and the embedded rotating ring (116) are fixedly connected by multiple synchronous guide slides (117) arranged radially along the embedded rotating ring (116).

3. A high-frequency fatigue testing machine using a magnetic shaft linear motor according to claim 2, characterized in that: Each synchronous guide slide (117) is slidably fitted with a counterweight mounting slide (119), and the counterweight is fixedly installed on the counterweight mounting slide (119) in a way that is easy to disassemble.

4. A high-frequency fatigue testing machine using a magnetic shaft linear motor according to claim 3, characterized in that: A load regulating motor (109) is fixedly installed on the load support plate (105). Two parallel lifting rod guide slides (107) are also fixedly installed on the load support plate (105). Lifting rods (108) are slidably sleeved on the two lifting rod guide slides (107). Rotary seats (113) are fixedly installed on the output shafts of the lifting rods (108) and the load regulating motor (109). The two rotary seats (113) are coaxially arranged, and each rotary seat (113) is movably connected with the same number of centrifugal power pull rods (114) as the synchronous guide slides (117). The opposite ends of each pair of centrifugal power pull rods (114) on the two rotary seats (113) are movably connected by a counterweight mounting slide (119).

5. A high-frequency fatigue testing machine using a magnetic shaft linear motor according to claim 4, characterized in that: Two steering roller brackets (102) are fixedly installed on the upper surface of the test bench (101). The two steering roller brackets (102) are respectively located directly below the magnetic shaft linear motor and the rotary seat (113). Each steering roller bracket (102) is rotatably mounted with a steering roller (103). The two steering rollers (103) are connected by a load rope (127). One end of the load rope (127) is fixedly connected to the lifting rod (108). The other end of the load rope (127) is fixedly mounted with a load rope connecting block (126). The load rope connecting block (126) is fixedly engaged with the actuating rod of the magnetic shaft linear motor.

6. A high-frequency fatigue testing machine using a magnetic shaft linear motor according to claim 5, characterized in that: Two symmetrically arranged load angle adjusting electric cylinders (120) are also movably installed on the crossbeam plate (110). The telescopic cylinder ends of the two load angle adjusting electric cylinders (120) are movably connected to the crossbeam plate (110). The telescopic rod ends of the two load angle adjusting electric cylinders (120) are movably connected to load angle adjusting swing arms (124). The two load angle adjusting swing arms (124) are respectively sleeved on two clamping spline slide rods (123) by spline sliding. The load angle adjusting swing arms (124) are rotatably engaged with the support arm plate (111).

7. A high-frequency fatigue testing machine using a magnetic shaft linear motor according to claim 6, characterized in that: A clamping electric cylinder (112) is also fixedly installed on the crossbeam plate (110). The two clamping spline slide rods (123) are rotatably mounted with clamping force transmission sleeves (122) at the ends away from the clamping plate (125). The two clamping force transmission sleeves (122) are movably connected to the telescopic rod ends of the clamping electric cylinder (112) through clamping pull rods (121).

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