A portable vibration excitation system for simulating railway operation

Abstract

The present invention provides a portable excitation system for simulating rail operation, including a stepper motor, a reduction box, a bracket, a clamping device, and an exciter. The excitation device is fixed to the rail to be measured by the clamping device, and the stepper motor on the bracket outputs power evenly to the two output shafts of the reduction box through the reduction box. A single-tooth gear is installed at the end of each of the two output shafts, and the single-tooth gear rotates continuously to mesh with the teeth on the excitation rod, driving the excitation rod of the excitation device to move upward, and the excitation rod is reset under the action of the spring force to impact the rail to be measured. The speed of the stepper motor can be adjusted by the controller to achieve different excitation frequencies, and the impact force can be achieved by adjusting the pre-compression amount of the spring. The advantages of the present invention are: compact structure, easy to carry, simple installation and use methods, high reliability, convenient on-site adjustment, and can simulate rail excitation signals under different working conditions.

Description

Technical Field

[0001] The present invention relates to the technical field of vibration excitation systems, and in particular to an electric-controlled vibration excitation system, specifically a portable electric loading system for simulating rail operation. Background Art

[0002] my country's railway and subway construction has developed rapidly and has achieved good economic and social benefits. As the speed of rail transportation continues to increase, the trial operation of rails and the status monitoring after a period of use are important guarantees for ensuring the safe operation of rail transportation. The detection of rail operation status and safety conditions is one of the problems that the rail department needs to solve urgently, and it is also the top priority to ensure the long-term safe operation of rail transportation.

[0003] The vibration of rails under the excitation of trains or subways is the key content of detecting the operating status of rails. Online detection of rails during the operation of trains or subways is not only time-consuming and costly, but also causes great damage to on-site sensors and equipment. At the same time, rail transit near buildings will have a certain impact on residents' lives, work and rest. Therefore, the problems caused by rail transit vibration have attracted much attention. The impact of vibration during normal operation of trains or subways on rails, foundations, surrounding environment, and surface buildings has become a major research direction.

[0004] At present, the heavy hammer method is mostly used for simulating rail impact tests. The heavy hammer method requires large equipment, and the impact force and frequency are difficult to adjust, and the method is not flexible enough.

[0005] Therefore, in order to effectively simulate the actual vibration characteristics of the rail during operation, a set of portable excitation equipment with adjustable impact force and frequency is needed to provide an excitation source for rail vibration research, especially to provide a new means for experimental research on rail vibration monitoring. Summary of the invention

[0006] The present invention aims to provide a portable vibration excitation device for simulating the vibration impact of a train or subway on a rail when the train or subway runs on the rail, which can realize adjustable vibration frequency and impact force. The device has the characteristics of convenient installation and adjustment, simple structure, low cost, etc., and can be well applied to the vibration impact of train rails or subway rails. The technical solution of the present invention is:

[0007] A portable vibration excitation system for simulating rail operation, characterized in that the vibration excitation system comprises a stepping motor and a gearbox assembly, an equipment bracket, a vibration excitation device, and a clamping device;

[0008] The stepper motor and gearbox assembly are mounted on the equipment bracket;

[0009] The equipment bracket includes aluminum profiles and angle irons, wherein the aluminum profile column is provided with a plurality of mounting holes along its height direction, and the upper crossbeam in the aluminum profile is adjusted in height position by selecting different positions on the aluminum alloy column for connection, so as to realize the adjustment of the exciting force;

[0010] The excitation device includes a return spring, a spring seat, an excitation rod, an incomplete gear, and an excitation rod guide; the gearbox is provided with two parallel output shafts, the incomplete gears are respectively provided on the two output shafts, the excitation rod is located between the two output shafts, and single teeth or racks matching the incomplete gears are respectively provided on both sides of the excitation rod;

[0011] The clamping device is arranged at the lower part of the equipment support, and is used to clamp the rail to be tested, so that the rail to be tested is not loose and is located below the excitation device; the chassis of the clamping device is connected to different positions on the aluminum alloy column through the chassis mounting bolts, so as to realize the overall position adjustment of the clamping device in the height direction;

[0012] The exciting rod forms a moving pair with the spring seat through the exciting rod guide, and the exciting rod can move up and down in the vertical direction along the exciting rod guide; the spring seat is fixed to the upper cross beam of the equipment bracket by the spring seat fixing bolt, and a reset spring is provided between the spring seat and the exciting rod.

[0013] Furthermore, the gearbox is composed of an upper housing, a lower housing, an input shaft, an input shaft flat key, a first output shaft, a second output shaft, an oil drain plug, a perspective cover, a perspective cover mounting bolt, an input shaft gear, a first output shaft gear, a second output shaft gear, a bearing cover, and a bearing cover; the input shaft gear is circumferentially positioned with the input shaft by a flat key and axially positioned by a sleeve, and the input shaft is supported by a pair of bearings, and the bearings are axially positioned by an embedded bearing cover and an embedded bearing cover; the first output shaft and the second output shaft have the same structure as the parts thereon, wherein the first output shaft gear on the first output shaft is circumferentially fixed with the first output shaft by a flat key, the first output shaft gear is axially positioned with the first output shaft by a sleeve, and the bearing on the first output shaft is axially positioned by an embedded bearing cover and an embedded bearing cover; the incomplete gear is circumferentially fixed with the first output shaft by a flat key, and is circumferentially positioned and fastened with the first output shaft by a gear shaft end positioning retaining ring and a gear shaft end fixing bolt.

[0014] Furthermore, the incomplete gear is a single-tooth gear or a gear with 2-4 continuous teeth, and corresponding single teeth or racks are arranged on both sides of the exciting rod.

[0015] Furthermore, the protruding end of the first output shaft is equipped with a bearing support, and the bearing support is installed in the groove of the aluminum profile of the equipment bracket. A threaded hole is provided on the side of the bearing support. The bearing support is fixed to the equipment bracket through the aluminum profile angle iron, and the bearing support can be adjusted for horizontal displacement in the groove.

[0016] Further, the clamping device includes the clamping device chassis, the clamping device chassis mounting bolts, the clamping block, the clamping device upper connecting rod, the clamping device connecting rod with a handle, the clamping device lower connecting rod, the clamping device hinge, and the clamping device support rod;

[0017] The excitation system is clamped with the measured rail by a clamping block, the clamping block is fixed together with the clamping device support rod, and the clamping device support rod is fixed with the lower connecting rod of the clamping device, the clamping block, the clamping device support rod and the lower connecting rod of the clamping device together constitute the same component, the lower connecting rod of the clamping device forms a rotating pair with the clamping device connecting rod through a clamping device hinge, the upper connecting rod of the clamping device and the clamping device connecting rod form a rotating pair through a clamping device hinge, the upper connecting rod of the clamping device and the lower connecting rod of the clamping device form a rotating pair with the clamping device chassis through a clamping device hinge, and the clamping device chassis is fixed to the equipment bracket through four sets of clamping device chassis mounting bolts;

[0018] When the clamping device is clamped, the connecting rod on the clamping device is ensured to be in the same line with the connecting rod of the clamping device and to be in the dead point state of the four-bar mechanism, thereby ensuring reliable clamping.

[0019] The device of the present invention is convenient to carry and easy to install, and can simulate the impact on the rails when the train starts, stops and runs, replacing the actual working conditions of the actual train operation, reducing the test cost, and ensuring the safety of the test. The vibration signal obtained during the test provides data support for the normal maintenance of the rails and the impact of the train operation on the surrounding environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 , 2 They are respectively the front view and the A-direction view of a portable simulation rail operation excitation system;

[0021] Figure 3 , 4 They are respectively a front view and a stereoscopic view of the stepping motor and the gearbox assembly of the present invention;

[0022] Figure 5 It is a stereoscopic diagram of the input shaft system and the output shaft system in the gearbox of the present invention;

[0023] Figure 6 It is a three-dimensional diagram of the equipment support in the present invention;

[0024] Figure 7 ,8 They are respectively a front view and a stereoscopic view of the vibration excitation device of the present invention;

[0025] Fig. 9 , 10 They are respectively a front view and a stereoscopic view of the clamping device in the present invention. DETAILED DESCRIPTION

[0026] The specific implementation mode of the present invention is further described in detail below in conjunction with the accompanying drawings, but this implementation is not intended to limit the protection scope of the present invention. All similar structures and detailed changes of the present invention should be included in the protection scope of the present invention.

[0027] A portable vibration excitation system for simulating rail operation, comprising: a stepper motor and a gearbox (DX), an equipment bracket, a vibration excitation device (JZ), and a clamping device (JJ). The clamping device (JJ) is easy to operate, safe and reliable, and the vibration frequency and vibration force of the vibration excitation rod in the vibration excitation device (JZ) are adjustable. The stepper motor and gearbox assembly (DX) comprises a stepper motor 1, a motor seat 2, a motor mounting bolt group 3, a coupling 4, a gearbox 5, a gearbox mounting bolt 16, and a motor bracket mounting bolt 17. The vibration excitation device (JZ) comprises a reset spring 8, a spring seat 9, a vibration excitation rod 10, single-tooth gears 11 and 38, a single-tooth gear shaft end positioning retaining ring 23, a single-tooth gear shaft end fixing bolt 24, a spring seat fixing bolt 25, and a vibration excitation rod guide 26. The clamping device (JJ) includes a clamping device chassis 12, a clamping device chassis mounting bolt 13, a clamping block 14, a clamping device upper connecting rod 18, a clamping device connecting rod 19 with an operating handle, a clamping device lower connecting rod 21, a clamping device hinge 20, and a clamping device support rod 22.

[0028] The stepper motor 1 is mounted on the motor bracket 2 through the motor mounting bolt group 3, and the motor bracket 2 is fixed to the equipment bracket 6 through the motor bracket mounting bolts 17. The stepper motor 1 is connected to the coupling 4 through the motor shaft flat key 28, and the motor power is input to the gearbox 5 through the gearbox input shaft flat key 29. The gearbox 5 is fixed to the equipment bracket 6 through the gearbox mounting bolts 16, and the equipment bracket 6 is constructed of 30mm×30mm aluminum profiles through aluminum profile angle irons 7.

[0029] The gearbox 5 is composed of an upper case 27, a lower case 32, an input shaft 30, an input shaft flat key 29, a first output shaft 40, a second output shaft 37, an oil drain plug 31, a perspective cover 33, a perspective cover mounting bolt 34, an input shaft gear 39, a first output shaft gear 42, a second output shaft gear 35, a bearing transparent cover 36, a bearing cover 41, and single-tooth gears 11, 38 at the end of the output shaft, a single-tooth gear shaft end positioning retaining ring 23, and a single-tooth gear shaft end fixing bolt 24. The input shaft gear 39 is circumferentially positioned with the input shaft 30 through a flat key 44 and axially positioned through a sleeve 45. The input shaft 30 is supported by a pair of bearings 43, and the bearings 43 are axially positioned through an embedded bearing cover 36 and an embedded bearing cover 41. The embedded bearing cover 36 and the embedded bearing cover 41 are respectively embedded in the sink 50 of the lower housing 32 and the upper housing 27 of the gearbox. Adjustment washers made of asbestos-free material can be selectively added to ensure reliable positioning of the bearings 43 and the gears 42 on the input shaft 30. The first output shaft 40 and the second output shaft 37 have the same structure as the parts thereon, wherein the first output shaft gear 42 on the first output shaft 40 is circumferentially fixed with the first output shaft 40 through a flat key 44, the first output shaft gear 42 is axially positioned with the first output shaft 40 through a sleeve 45, and the bearings 43 on the first output shaft 40 are axially positioned through the embedded bearing cover 36 and the embedded bearing cover 41. The single-tooth gear 38 is mounted on the protruding end of the first output shaft 40 , and the single-tooth gear 38 is circumferentially fixed to the first output shaft 40 by a flat key 46 , and is circumferentially positioned and fastened to the first output shaft 40 by a single-tooth gear shaft end positioning retaining ring 23 and a single-tooth gear shaft end fixing bolt 24 .

[0030] A bearing support 49 is installed at the protruding end of the first output shaft 40. The bearing support 49 is installed in the groove of the aluminum profile of the equipment bracket 6. A threaded hole is provided on the side of the bearing support 49. The bearing support 49 is fixed to the equipment bracket 6 through the aluminum profile angle iron 7. The bearing support 49 can be adjusted for horizontal displacement in the groove.

[0031] The excitation system is clamped with the measured rail 15 by a clamping block 14, and the clamping block 14 is fixed together with the clamping device support rod 22, and the clamping device support rod 22 is fixed with the clamping device lower connecting rod 21. The clamping block 14, the clamping device support rod 22 and the clamping device lower connecting rod 21 together constitute the same component, the clamping device connecting rod 19 is connected with the clamping device lower connecting rod 21 through a clamping device hinge 20 to form a rotation pair, the clamping device upper connecting rod 18 and the clamping device connecting rod (19) form a rotation pair through the clamping device hinge 20, the clamping device upper connecting rod 18 and the clamping device lower connecting rod 21 and the clamping device chassis 12 each form a rotation pair through the clamping device hinge 20, and the clamping device chassis 12 is fixed to the equipment bracket 6 through four sets of clamping device chassis mounting bolts 13. The aluminum profile column L2 of the equipment bracket 6 is provided with a groove (C1) parallel to the column, and the mounting bolt 13 can move up and down in the groove (C1). The clamping device chassis 12 can adjust the overall position of the clamping device (JJ) by adjusting the vertical position of the chassis mounting bolt 13 on the equipment bracket 6.

[0032] When the clamping device (JJ) is clamped, the connecting rod 18 on the clamping device and the connecting rod 19 of the clamping device are ensured to be in the same line and be in the dead point state of the four-bar mechanism, thereby ensuring reliable clamping.

[0033] Two teeth C1 and C2 are arranged on both sides of the exciting rod 10, and the sides of the two teeth C1 and C2 are straight lines, which mesh with the two single-tooth gears 11 and 38 respectively during operation. The exciting rod 10 forms a moving pair with the spring seat 9 through two exciting rod guides 26, and the exciting rod 10 can move up and down along the exciting rod guides 26 in the vertical direction. The spring seat 9 is fixed to the upper crossbeam L1 of the equipment bracket 6 by the spring seat fixing bolts 25, and a reset spring 8 is arranged between the spring seat 9 and the exciting rod 10. The upper crossbeam L1 can be fixed by adjusting the position of the bolt group 52 on the 4 groups of angle irons 51 below it and fixing it in the upper groove C1 of the aluminum profile column L2, thereby changing the compression amount of the reset spring 8 and realizing the adjustment of the exciting force.

[0034] The excitation signal of simulated rail operation is closely related to the signal frequency and the magnitude of the excitation force. At the same time, the excitation system is required to be portable to realize the loading of the excitation signal at different positions of the rail. The present invention can adjust the initial compression amount of the reset spring 8 by adjusting the position of the upper beam L1 of the equipment bracket 6, thereby changing the magnitude of the excitation force on the rail. The stepper motor 1 in the present invention is equipped with its controller to realize the motor speed adjustment, and the vibration frequency of the excitation rod 10 can be adjusted through the single-tooth gear 11 on the output shaft of the gearbox 5.

[0035] The end of the exciting rod 10 in the exciting device (JZ) is a spherical surface, which keeps in contact with the rail 15 to be tested before the system is started. When the two single-tooth racks C1 and C2 are symmetrically arranged on the sides of the exciting rod 10 and the single-tooth gears 11 and 38 rotate until the single tooth on the gear and the single tooth on the rack enter into meshing, the end of the exciting rod 10 is away from the rail 15 to be tested. After the meshing is completed, the exciting rod 10 exerts an impact on the rail 15 to be tested under the action of the reset spring 8.

[0036] In order to ensure the reliability of applying the excitation signal, the excitation system needs to firmly clamp the rail 15 to be tested. The working part of the clamping device (JJ) in the present invention is the clamping block 14 which is processed in the shape of the rail cross section. The clamping block 14 can be made of engineering plastics with higher hardness, such as polytetrafluoroethylene. The clamping block 14 is clamped and relaxed with the movement of the handle on the clamping device (JJ). The clamping device (JJ) is implemented by a hinged four-bar mechanism, and when clamping, the connecting rod 18 and the connecting rod 19 of the clamping device are located in the same straight line. At this time, no matter how much force the clamping block 14 is subjected to during impact, the force and speed of the upper connecting rod 18 of the clamping device are 90°, that is, there is no force to reset the connecting rod 18 on the clamping device. Only when the operator moves the handle on the connecting rod 19 of the clamping device inward, the clamping block 14 is out of contact with the rail 15 to be tested and is in a relaxed state.

[0037] The output of the gearbox 5 adopts two output shafts 37 and 40, and two single-tooth gears 11 and 38 are respectively installed on the two output shafts. The two single-tooth gears 11 and 38 have the same rotation speed and opposite rotation direction. The phase of the teeth on the gears is symmetrical about the middle symmetric plane of the gearbox, and can simultaneously enter and disengage with the excitation rod teeth C1 and C2. Three gears are arranged in the gearbox 5. The gear input shaft 30 of the intermediate gear 39 is connected to the motor shaft through a coupling. The intermediate gear 39 is in external meshing with the gears 35 and 42 of the two output shafts to ensure that the gears on the two output shafts 37 and 40 have the same rotation speed. The gear 39 on the intermediate input shaft has the same module as the gears 35 and 42 on the two output shafts, and the number of teeth can be the same or different.

[0038] The single-tooth gear 38, by meshing with the tooth C2 on the excitation rod, can ensure that the displacement Δx of the excitation rod 10 on its guide path 26 is:

[0039] Δx=mπ / 2

[0040] Where: m is the module of the single-tooth gear and the teeth on the excitation rod. To obtain a greater exciting force,

[0041] The relative displacement of the excitation rod 10, that is, the compression amount of the reset spring 8, can be increased. At this time, the single-tooth gear can be set to an incomplete gear with multiple teeth, such as 2 to 4 teeth, and the number of teeth on the rack on the corresponding excitation rod 10 is also increased to the same number of teeth. After the number of teeth is increased, the displacement Δx of the excitation rod 10 on the guide path is:

[0042] Δx=(z-1 / 2)mπ

[0043] Where: z-the number of teeth of the incomplete gear.

[0044] The formula of the exciting force F applied by the exciting rod 10 on the rail 15 to be tested is as follows:

[0045]

[0046] FΔt / 2=m g v

[0047] Δt=1 / f

[0048] F=2mvf

[0049] Where: k-spring stiffness, N / mm. m g -Mass of the excitation rod, kg. v-Speed ​​of the excitation rod before it touches the rail, m / s. Δt-Excitation period, s. f-Excitation frequency, Hz.

[0050] When the excitation system of the present invention is installed on site, firstly, the two rows of parallel legs of the equipment bracket 6 are symmetrically placed on both sides of the measured rail 15, and it is ensured that the end of the excitation rod 10 contacts the upper surface of the measured rail. Secondly, the two handles are toggled to clamp the measured rail with the clamping blocks 14 of the two symmetrical clamping devices (JJ) on the equipment bracket 5, and it is ensured that the connecting rod 18 and the connecting rod 19 on the clamping device are in line. Then, the position of the spring seat is adjusted to ensure that the compression amount of the reset spring 8 meets the excitation force requirement. Finally, the stepper motor 1 is started to realize the excitation. If the cross-sectional dimensions of the measured rail 15 are different, different clamping blocks 14 can be replaced, and the clamping device (JJ) can adjust the displacement to clamp the rails in different environments.

[0051] The stepper motor 1 is the power source of the excitation system. By setting the stepper motor driving signal, the excitation rod 10 simulates the vibration signal of the train or subway operation. When the simulated train or subway is in the startup stage, the stepper motor 1 gradually increases the speed under the driving signal and the excitation frequency gradually increases. When simulating normal operation, the stepper motor speed is maintained constant. When the train or subway slows down and stops, the stepper motor speed gradually decreases to achieve frequency reduction output.

[0052] The stepper motor driver can be a single-chip control system to achieve the output of different frequency drive signals. The vibration excitation system for simulating rail operation in the present invention can detect vibration signals of rails, roadbeds, surrounding environment, ground buildings, etc. in conjunction with relevant sensors, data acquisition and analysis systems, and provide reliable experimental data for the impact of rail transit operation.

Claims

1. A portable vibration excitation system for simulating railway operation, characterized in that: The vibration excitation system includes a stepper motor and gearbox assembly (DX), an equipment bracket, a vibration excitation device (JZ), and a clamping device (JJ); The stepper motor and gearbox assembly (DX) are mounted on the equipment bracket; The equipment support (6) comprises an aluminum profile and an angle iron (7), wherein the upper crossbeam (L1) in the aluminum profile is connected at different positions on the aluminum alloy column to adjust its height position, thereby achieving adjustment of the exciting force; The exciting device (JZ) comprises a return spring (8), a spring seat (9), an exciting rod (10), an incomplete gear, and an exciting rod guide (26); the gearbox is provided with two parallel output shafts, the incomplete gears are respectively provided on the two output shafts, the exciting rod (10) is located between the two output shafts, and single teeth or racks matching the incomplete gears are respectively provided on both sides of the exciting rod (10); The clamping device (JJ) is arranged at the lower part of the equipment support and is used to clamp the rail to be tested so that the rail to be tested is firmly located below the vibration excitation device (JZ); the chassis (12) of the clamping device is connected to different positions on the aluminum alloy column through chassis mounting bolts (13) to achieve overall position adjustment of the clamping device (JJ) in the height direction; The exciting rod (10) forms a moving pair with the spring seat (9) through the exciting rod guide (26), and the exciting rod (10) moves up and down in the vertical direction along the exciting rod guide (26); the spring seat (9) is fixed to the upper crossbeam (L1) of the equipment bracket (6) through the spring seat fixing bolt (25), and a return spring (8) is provided between the spring seat (9) and the exciting rod (10); The gearbox (5) is composed of an upper housing (27), a lower housing (32), an input shaft (30), an input shaft flat key (29), a first output shaft (40), a second output shaft (37), an oil drain plug (31), a perspective cover (33), perspective cover mounting bolts (34), an input shaft gear (39), a first output shaft gear (42), a second output shaft gear (35), a bearing transparent cover (36), and a bearing cover (41); the input shaft gear (39) is circumferentially positioned with the input shaft (30) by means of a first flat key (44), and is axially positioned by means of a sleeve (45); the input shaft (30) is supported by a pair of bearings (43), and the bearings (43) are axially positioned by means of an embedded bearing transparent cover (36) and an embedded bearing cover (41). The first output shaft (40) and the second output shaft (37) have the same structure as the parts thereon, wherein the first output shaft gear (42) on the first output shaft (40) is circumferentially fixed to the first output shaft (40) by a first flat key (44), the first output shaft gear (42) is axially positioned with the first output shaft (40) by a sleeve (45), and the bearing (43) on the first output shaft (40) is axially positioned by an embedded bearing cover (36) and an embedded bearing cover (41); the incomplete gear is circumferentially fixed to the first output shaft (40) by a second flat key (46), and is circumferentially positioned and fastened to the first output shaft (40) by a gear shaft end positioning retaining ring (23) and a gear shaft end fixing bolt (24); The incomplete gear is a single-tooth gear or a gear with 2-4 continuous teeth, and corresponding single teeth or racks are arranged on both sides of the exciting rod (10).

2. A portable vibration excitation system for simulating railway operation as claimed in claim 1, characterized in that: A bearing support (49) is mounted on the protruding end of the first output shaft (40). The bearing support (49) is installed in a groove of the aluminum profile of the equipment support. A threaded hole is provided on the side of the bearing support (49). The bearing support (49) is fixed to the equipment support through an aluminum profile angle iron (7). The bearing support (49) is adjusted for horizontal displacement in the groove.

3. A portable vibration excitation system for simulating railway operation as claimed in claim 1, characterized in that: The clamping device (JJ) comprises the clamping device chassis (12), clamping device chassis mounting bolts (13), a clamping block (14), a clamping device upper connecting rod (18), a clamping device connecting rod with a handle (19), a clamping device lower connecting rod (21), a clamping device hinge (20), and a clamping device support rod (22); The excitation system is achieved by clamping a clamping block (14) with the rail (15) to be tested. The clamping block (14) is fixed together with a clamping device support rod (22). At the same time, the clamping device support rod (22) is fixed to a clamping device lower connecting rod (21). The clamping block (14), the clamping device support rod (22) and the clamping device lower connecting rod (21) together constitute a same component. The clamping device lower connecting rod (21) is connected to the clamping device through a clamping device hinge (20). The device connecting rod (19) forms a revolving pair, the clamping device upper connecting rod (18) and the clamping device connecting rod (19) form a revolving pair via a clamping device hinge (20), the clamping device upper connecting rod (18) and the clamping device lower connecting rod (21) form a revolving pair with the clamping device chassis (12) via the clamping device hinge (20), and the clamping device chassis (12) is fixed to the equipment bracket (6) via four sets of clamping device chassis mounting bolts (13); When the clamping device (JJ) is clamped, the connecting rod (18) on the clamping device and the connecting rod (19) of the clamping device are ensured to be in the same line and be in the dead point state of the four-bar mechanism, thereby ensuring reliable clamping.

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