CN114486257A - Rolling bearing vibration detection experiment table - Google Patents

Abstract

The invention relates to the technical field of bearing detection devices, and discloses an experimental bench for vibration detection of rolling bearings, comprising: a rolling bearing body and a detection platform, a mounting bracket is fixedly connected to the top of the detection platform, and both sides of the mounting bracket are installed There are pneumatic telescopic rods. The experimental bench for vibration detection of rolling bearings is provided with a pneumatic telescopic rod, a fixed frame, a fixed plate, a guide tube, a spring, a push rod and a first vibration detector, and the rolling bearing body is installed on the installation rod, and the output shaft of the driving motor passes through The connecting rod drives the installation rod to rotate, starts the pneumatic telescopic rod, the telescopic end of the pneumatic telescopic rod stretches out, and pushes the fixed frame and the fixed plate to move in the direction of the rolling bearing body. Push the push rod and press the first vibration detector on the surface of the outer ring of the rolling bearing body through the push rod, so that the vibration condition of the outer ring of the rolling bearing body can be tested.

Description

A test bench for vibration detection of rolling bearings

technical field

The invention relates to the technical field of bearing detection devices, in particular to a test bench for vibration detection of rolling bearings.

Background technique

Bearing is an important component in contemporary mechanical equipment. Its main function is to support the mechanical rotating body, reduce the friction coefficient during its movement, and ensure its rotation accuracy. Before it is officially put into use after production is completed, its quality is the most intuitive. The response of the bearing is the result of the bearing being tested on the testing equipment. The detection of the bearing generally adopts the vibration signal of the surface of the bearing under specific working conditions. The vibration value of the bearing is one of the indicators reflecting the quality of the bearing.

Detecting the vibration of the bearing in production The common motion is driven by the drive rod to drive the inner ring of the bearing to rotate, and the vibration detector is in contact with the surface of the ball bearing to detect the vibration during the operation of the bearing. The outer rings are tested separately, and when the motor drives the rotation of the driving rod, the body of the driving rod will vibrate, which will easily affect the test results.

SUMMARY OF THE INVENTION

In view of the deficiencies of the prior art, the present invention provides a test bench for vibration detection of rolling bearings, which solves the problems mentioned in the above background.

The present invention provides the following technical solutions: an experimental bench for vibration detection of rolling bearings, comprising: a rolling bearing body and a detection platform, a mounting frame is fixedly connected to the top of the detection platform, and pneumatic telescopic rods are installed on both sides of the mounting frame, The telescopic ends of the two pneumatic telescopic rods pass through the mounting frame and are fixedly connected with a first detection mechanism. The two first detection mechanisms are respectively located on both sides of the rolling bearing body, and the top of the detection table is provided with a chute. The inner wall of the chute is provided with a position adjustment mechanism, the surface of the position adjustment mechanism is threadedly connected with a moving block, the moving block is slidably connected to the inner wall of the chute, and the top of the moving block is fixedly connected with a bracket mechanism, The rolling bearing body is movably connected to the inner wall of the bracket mechanism, the inner wall of the bracket mechanism is fixedly connected with a connecting plate, the surface of the connecting plate is provided with a second detection mechanism, and the top of the detection table is fixedly connected with a mounting seat , the inner wall of the mounting seat is fixedly connected with a drive motor, the output shaft of the drive motor is fixedly connected with a connecting rod, the surface of the connecting rod is provided with a support mechanism, and one end of the connecting rod is fixedly connected with a mounting rod, so The rolling bearing body is sleeved on the surface of the mounting rod.

Preferably, the first detection mechanism includes a fixing frame, the surface of the fixing frame is fixedly connected with a fixing plate, the inner wall of the fixing frame is fixedly connected with a guide tube and a spring, and the spring is located inside the guide tube One end of the spring is fixedly connected with a push rod, one end of the push rod penetrates the fixing plate and is fixedly connected with a first vibration detector, and the first vibration detector is movably connected to the surface of the rolling bearing body.

Preferably, a soft pad is fixedly connected to the inner wall of the fixing plate, and the inner wall of the soft pad is movably connected to the surface of the rolling bearing body.

Preferably, the second detection mechanism includes a second vibration detector, an electric telescopic rod is fixedly connected to the surface of the connecting plate, and the telescopic end of the electric telescopic rod penetrates the connecting plate and is fixedly connected with a mounting plate. A fixing rod is fixedly connected to the surface of the plate, the second vibration detector is fixedly connected to one end of the fixing rod close to the rolling bearing body, and the second vibration detector is movably connected to the surface of the inner ring of the rolling bearing body.

Preferably, the support mechanism includes a support frame, the inner wall of the support frame is fixedly connected with a shock-absorbing ring, the connecting rod is rotatably connected to the inner wall of the shock-absorbing pad, and both ends of the support frame are fixedly connected with mounting blocks, The bottom of the mounting block is fixedly connected with a shock-absorbing pad, the bottom of the shock-absorbing pad is provided with anti-skid lines, the shock-absorbing pad is movably connected to the top of the testing table, and the inner wall of the mounting block is threadedly connected with bolts, so the The mounting block and the shock-absorbing pad are mounted on the top of the test stand by bolts.

Preferably, the position adjustment mechanism includes a threaded rod and a forward and reverse rotation motor, the output shaft of the forward and reverse rotation motor is fixedly connected to one end of the threaded rod, and the other end of the threaded rod is rotatably connected to the inner wall of the chute, the The moving block is threaded on the surface of the threaded rod.

Preferably, a support plate is fixedly connected to the inner wall of the chute, and one end of the threaded rod is rotatably connected to the inner wall of the support plate.

Preferably, the bracket mechanism includes a placement seat, the rolling bearing body is movably connected to the inner wall of the placement seat, a push plate and a limit plate are respectively provided on the front and back of the rolling bearing body, the push plate and the limit plate Both are fixedly connected to the inner wall of the placing seat, and the limiting plate is sleeved on the surface of the mounting rod.

Preferably, the bottom of the placement seat is provided with a guiding mechanism, the guiding mechanism is installed on the top of the detection table, the number of the guiding mechanisms is two, and the two guiding mechanisms are divided by the number of the guiding mechanisms passing through the placement seat. The central vertical plane is set symmetrically to the symmetrical plane.

Preferably, the guiding mechanism includes a guiding block and a guiding rail, a connecting groove is formed at the bottom of the placing seat, and the inner wall of the connecting groove is fixedly connected with the surface of the guiding block, and the guiding block is slidably connected on the The surface of the guide rail, the guide rail is fixedly connected to the top of the inspection table, and the two ends of the guide rail are fixedly connected to the limit blocks.

Compared with the prior art, the present invention has the following beneficial effects:

1. The experimental bench for vibration detection of rolling bearing is installed on the installation rod by setting the pneumatic telescopic rod, the fixing frame, the fixed plate, the guide tube, the spring, the push rod and the first vibration detector to drive the output of the motor. The shaft drives the installation rod to rotate through the connecting rod, starts the pneumatic telescopic rod, the telescopic end of the pneumatic telescopic rod stretches out, and pushes the fixed frame and the fixed plate to move in the direction of the rolling bearing body. , the spring pushes the push rod, and the first vibration detector is pressed on the surface of the outer ring of the rolling bearing body through the push rod, and the vibration condition of the outer ring of the rolling bearing body can be tested.

2. The test bench for vibration detection of rolling bearings is equipped with an electric telescopic rod, a mounting plate, a fixed rod and a second vibration detector. The telescopic end of the electric telescopic rod extends to push the mounting plate to move, and the mounting plate pushes the fixed rod to move and fix it. The rod pushes the second vibration detector to be attached to the inner ring of the rolling bearing body, so that the vibration condition of the inner ring of the rolling bearing body can be tested.

3. The test bench for vibration detection of rolling bearing is set up with support frame, shock-absorbing ring, mounting block and shock-absorbing pad, start the drive motor, the output shaft of the drive motor rotates to drive the connecting rod to rotate, and the support frame provides support for the connecting rod, Improve the stability of the connecting rod when it rotates. The inner wall of the shock-absorbing ring is attached to the surface of the rotating connecting rod to absorb the vibration generated when the connecting rod rotates. At the same time, the vibration of the support frame is further absorbed by the shock-absorbing pad, so that the connecting rod can be stable. The rotation of the connecting rod avoids the impact of the vibration generated by the connecting rod on the test structure of the rolling bearing body.

Description of drawings

1 is a schematic diagram of the three-dimensional structure of the present invention;

FIG. 2 is a schematic diagram of a side sectional structure at the position of the first detection mechanism of the present invention;

Fig. 3 is a schematic view of enlarged structure at place A in Fig. 2 of the present invention;

FIG. 4 is a schematic view of the side sectional structure at the position of the installation rod of the present invention;

Fig. 5 is the enlarged structural schematic diagram at B in Fig. 4 of the present invention;

FIG. 6 is a schematic diagram of a side sectional structure at the position of the support mechanism of the present invention.

In the figure: 1. Rolling bearing body; 2. Testing table; 3. Mounting frame; 4. Pneumatic telescopic rod; 5. First testing mechanism; 51. Fixing frame; 52. Fixing plate; ; 55, push rod; 56, first vibration detector; 6, chute; 7, position adjustment mechanism; 71, threaded rod; 72, forward and reverse motor; 8, moving block; 9, bracket mechanism; 91, Placement seat; 92, push plate; 93, limit plate; 10, connecting plate; 11, second detection mechanism; 111, electric telescopic rod; 112, mounting plate; 113, fixed rod; 114, second vibration detector; 12. Mounting seat; 13. Drive motor; 14. Connecting rod; 15. Supporting mechanism; 151. Supporting frame; 152. Damping ring; 153. Mounting block; 154. Damping pad; 16. Mounting rod; 17. Soft Pad; 18, support plate; 19, guide mechanism; 191, guide block; 192, guide rail.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Please refer to Figure 1-6, an experimental bench for vibration detection of rolling bearings, including: a rolling bearing body 1 and a detection platform 2, a mounting frame 3 is fixedly connected to the top of the detection platform 2, and pneumatic telescopic rods are installed on both sides of the mounting frame 3 4. The telescopic ends of the two pneumatic telescopic rods 4 penetrate through the mounting frame 3 and are fixedly connected with the first detection mechanism 5. The two first detection mechanisms 5 are located on both sides of the rolling bearing body 1 respectively. The top of the detection table 2 is provided with a sliding Slot 6, the inner wall of the chute 6 is provided with a position adjustment mechanism 7, the surface of the position adjustment mechanism 7 is screwed with a moving block 8, the moving block 8 is slidably connected to the inner wall of the chute 6, and the top of the moving block 8 is fixedly connected with a bracket Mechanism 9, the rolling bearing body 1 is movably connected to the inner wall of the bracket mechanism 9, the inner wall of the bracket mechanism 9 is fixedly connected with a connecting plate 10, the surface of the connecting plate 10 is provided with a second detection mechanism 11, and the top of the inspection table 2 is fixedly connected with a The mounting seat 12, the inner wall of the mounting seat 12 is fixedly connected with a driving motor 13, the output shaft of the driving motor 13 is fixedly connected with a connecting rod 14, the surface of the connecting rod 14 is provided with a support mechanism 15, and one end of the connecting rod 14 is fixedly connected with a mounting rod 16. The rolling bearing body 1 is sleeved on the surface of the mounting rod 16.

The first detection mechanism 5 includes a fixing frame 51, the surface of the fixing frame 51 is fixedly connected with a fixing plate 52, the inner wall of the fixing frame 51 is fixedly connected with a guide tube 53 and a spring 54, and the spring 54 is located inside the guide tube 53. One end of the spring 54 is fixedly connected with a push rod 55, one end of the push rod 55 penetrates the fixed plate 52 and is fixedly connected with a first vibration detector 56, the first vibration detector 56 is movably connected to the surface of the rolling bearing body 1, and starts the pneumatic expansion and contraction. Rod 4, the telescopic end of the pneumatic telescopic rod 4 extends, pushes the fixed frame 51 and the fixed plate 52 to move in the direction of the rolling bearing body 1, the soft pad 17 on the inner wall of the fixed plate 52 is attached to the outer ring of the rolling bearing body 1, and the spring 54 pushes The push rod 55 presses the first vibration detector 56 on the surface of the outer ring of the rolling bearing body 1 through the push rod 55, so that the vibration condition of the outer ring of the rolling bearing body 1 can be tested.

The inner wall of the fixed plate 52 is fixedly connected with a soft pad 17 , the inner wall of the soft pad 17 is movably connected to the surface of the rolling bearing body 1 , and the soft pad 17 has elasticity to prevent the fixed plate 52 from rigidly contacting the rolling bearing body 1 .

The second detection mechanism 11 includes a second vibration detector 114, the surface of the connecting plate 10 is fixedly connected with an electric telescopic rod 111, and the telescopic end of the electric telescopic rod 111 penetrates through the connecting plate 10 and is fixedly connected with a mounting plate 112. The mounting plate 112 A fixed rod 113 is fixedly connected to the surface of the rolling bearing body 1, the second vibration detector 114 is fixedly connected to one end of the fixed rod 113 close to the rolling bearing body 1, and the second vibration detector 114 is movably connected to the surface of the inner ring of the rolling bearing body 1. The telescopic end stretches out, pushes the mounting plate 112 to move, the mounting plate 112 pushes the fixed rod 113 to move, and the fixed rod 113 pushes the second vibration detector 114 to be attached to the inner ring of the rolling bearing body 1, so that the inner ring of the rolling bearing body 1 can be tested. Vibration condition.

The support mechanism 15 includes a support frame 151, the inner wall of the support frame 151 is fixedly connected with a shock-absorbing ring 152, the connecting rod 14 is rotatably connected to the inner wall of the shock-absorbing pad 154, and both ends of the support frame 151 are fixedly connected with mounting blocks 153. The bottom of the block 153 is fixedly connected with a shock-absorbing pad 154, the bottom of the shock-absorbing pad 154 is provided with anti-skid lines, the shock-absorbing pad 154 is movably connected to the top of the test table 2, the inner wall of the mounting block 153 is threadedly connected with bolts, and the mounting block 153 and The shock-absorbing pad 154 is installed on the top of the test table 2 by bolts, and the support frame 151 provides support for the connecting rod 14 to improve the stability of the connecting rod 14 when it rotates. The vibration generated when the connecting rod 14 is rotated is absorbed, and the vibration of the support frame 151 is further absorbed by the shock-absorbing pad 154, so that the connecting rod 14 can rotate smoothly.

The position adjustment mechanism 7 includes a threaded rod 71 and a forward and reverse rotation motor 72. The output shaft of the forward and reverse rotation motor 72 is fixedly connected to one end of the threaded rod 71, and the other end of the threaded rod 71 is rotatably connected to the inner wall of the chute 6. The moving block 8 is threadedly connected to the surface of the threaded rod 71, the moving block 8 is limited by the chute 6, does not rotate with the threaded rod 71, starts the forward and reverse rotation motor 72, the output shaft of the forward and reverse rotation motor 72 rotates, and drives the threaded rod 71 to rotate, Adjust the position of the moving block 8 on the surface of the threaded rod 71 , the moving block 8 drives the bracket mechanism 9 to move toward the mounting rod 16 , and the bracket mechanism 9 drives the rolling bearing body 1 to move, so that the rolling bearing body 1 is mounted on the surface of the mounting rod 16 .

The inner wall of the chute 6 is fixedly connected with a support plate 18, one end of the threaded rod 71 is rotatably connected to the inner wall of the support plate 18, and the support plate 18 supports one end of the threaded rod 71 to improve the stability of the rotation process of the threaded rod 71.

The bracket mechanism 9 includes a placement seat 91, the rolling bearing body 1 is movably connected to the inner wall of the placement seat 91, the front and back of the rolling bearing body 1 are respectively provided with a push plate 92 and a limit plate 93, and the push plate 92 and the limit plate 93 Both are fixedly connected to the inner wall of the placing seat 91 , and the limiting plate 93 is sleeved on the surface of the mounting rod 16 .

Among them; the bottom of the placement seat 91 is provided with a guiding mechanism 19, the guiding mechanism 19 is installed on the top of the test table 2, the number of guiding mechanisms 19 is two, and the two guiding mechanisms 19 are vertically passed through the center of the placement seat 91. The straight surface is symmetrically arranged, the guide mechanism 19 includes a guide block 191 and a guide rail 192, a connecting groove is formed at the bottom of the placing seat 91, and the inner wall of the connecting groove is fixedly connected with the surface of the guide block 191, and the guide The position block 191 is slidably connected to the surface of the guide rail 192, the guide rail 192 is fixedly connected to the top of the test table 2, and both ends of the guide rail 192 are fixedly connected to the limit blocks. The surface of the bracket slides to guide the bracket mechanism 9, so that the movement process of the bracket mechanism 9 is stable.

The working principle is to place the rolling bearing body 1 on the inner wall of the placement seat 91, start the forward and reverse rotation motor 72, the output shaft of the forward and reverse rotation motor 72 rotates, drive the threaded rod 71 to rotate, and adjust the position of the moving block 8 on the surface of the threaded rod 71, The moving block 8 drives the placing seat 91 to move in the direction of the mounting rod 16, the placing seat 91 drives the push plate 92 and the limit plate 93 to move, the push plate 92 pushes the rolling bearing body 1 to move, and presses the rolling bearing body 1 to the mounting rod 16 until the rolling bearing body 1. Install it on the surface of the mounting rod 16, start the driving motor 13, the output shaft of the driving motor 13 rotates and drives the connecting rod 14 to rotate, and provides support for the connecting rod 14 through the support frame 151, which improves the stability of the connecting rod 14 when it rotates, and reduces shock absorption. The inner wall of the ring 152 is in contact with the surface of the rotating connecting rod 14, which absorbs the vibration generated when the connecting rod 14 rotates, and at the same time further absorbs the vibration of the support frame 151 through the shock-absorbing pad 154, so that the connecting rod 14 can rotate smoothly and avoid connection. The vibration generated by the rod 14 affects the test structure of the rolling bearing body 1, the pneumatic telescopic rod 4 is activated, the telescopic end of the pneumatic telescopic rod 4 extends, and the fixed frame 51 and the fixed plate 52 are pushed to move in the direction of the rolling bearing body 1. The inner wall of the fixed plate 52 The soft pad 17 is attached to the outer ring of the rolling bearing body 1, the first vibration detector 56 is attached to the surface of the outer ring of the rolling bearing body 1, and the spring 54 is squeezed by the push rod 55, and the spring 54 is in a state of retraction, and then pushes The push rod 55 presses the first vibration detector 56 on the surface of the outer ring of the rolling bearing body 1 through the push rod 55, so as to test the vibration condition of the outer ring of the rolling bearing body 1, and start the electric telescopic when testing the vibration of the inner ring of the rolling bearing body 1 Rod 111, the telescopic end of the electric telescopic rod 111 extends, pushes the mounting plate 112 to move, the mounting plate 112 pushes the fixed rod 113 to move, and the fixed rod 113 pushes the second vibration detector 114 to be attached to the inner ring of the rolling bearing body 1, that is, Test the vibration condition of the inner ring of the rolling bearing body 1 .

Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, and substitutions can be made in these embodiments without departing from the principle and spirit of the invention and modifications, the scope of the present invention is defined by the appended claims and their equivalents.

Claims (10)

1. The utility model provides a rolling bearing vibration detection uses laboratory bench which characterized in that includes: the detection device comprises a rolling bearing body (1) and a detection platform (2), wherein the top of the detection platform (2) is fixedly connected with a mounting frame (3), pneumatic telescopic rods (4) are respectively installed on two sides of the mounting frame (3), the telescopic ends of the two pneumatic telescopic rods (4) penetrate through the mounting frame (3) and are fixedly connected with first detection mechanisms (5), the two first detection mechanisms (5) are respectively located on two sides of the rolling bearing body (1), a sliding groove (6) is formed in the top of the detection platform (2), the inner wall of the sliding groove (6) is provided with a position adjusting mechanism (7), the surface of the position adjusting mechanism (7) is in threaded connection with a moving block (8), the moving block (8) is in sliding connection with the inner wall of the sliding groove (6), the top of the moving block (8) is fixedly connected with a bracket mechanism (9), and the rolling bearing body (1) is movably connected with the inner wall of the bracket mechanism (9), the inner wall fixedly connected with of bracket mechanism (9) links up fishplate bar (10), the surface of linking up fishplate bar (10) is provided with second detection mechanism (11), detect top fixedly connected with mount pad (12) of platform (2), the inner wall fixedly connected with driving motor (13) of mount pad (12), the output shaft fixedly connected with connecting rod (14) of driving motor (13), the surface of connecting rod (14) is provided with supporting mechanism (15), the one end fixedly connected with installation pole (16) of connecting rod (14), antifriction bearing body (1) cup joints the surface at installation pole (16).

2. The experiment table for vibration detection of the rolling bearing according to claim 1, wherein the first detection mechanism (5) comprises a fixed frame (51), a fixed plate (52) is fixedly connected to the surface of the fixed frame (51), a guide tube (53) and a spring (54) are respectively and fixedly connected to the inner wall of the fixed frame (51), the spring (54) is located inside the guide tube (53), a push rod (55) is fixedly connected to one end of the spring (54), one end of the push rod (55) penetrates through the fixed plate (52) and is fixedly connected with a first vibration detector (56), and the first vibration detector (56) is movably connected to the surface of the rolling bearing body (1).

3. The rolling bearing vibration detection experiment table according to claim 2, wherein a soft pad (17) is fixedly connected to the inner wall of the fixing plate (52), and the inner wall of the soft pad (17) is movably connected with the surface of the rolling bearing body (1).

4. The experiment table for vibration detection of the rolling bearing according to claim 1, wherein the second detection mechanism (11) comprises a second vibration detector (114), the surface of the connection plate (10) is fixedly connected with an electric telescopic rod (111), the telescopic end of the electric telescopic rod (111) penetrates through the connection plate (10) and is fixedly connected with a mounting plate (112), the surface of the mounting plate (112) is fixedly connected with a fixing rod (113), the second vibration detector (114) is fixedly connected with one end, close to the rolling bearing body (1), of the fixing rod (113), and the second vibration detector (114) is movably connected on the surface of the inner ring of the rolling bearing body (1).

5. The rolling bearing vibration detection experiment table according to claim 1, wherein the supporting mechanism (15) comprises a supporting frame (151), a damping ring (152) is fixedly connected to the inner wall of the supporting frame (151), the connecting rod (14) is rotatably connected to the inner wall of a damping pad (154), mounting blocks (153) are fixedly connected to both ends of the supporting frame (151), the damping pad (154) is fixedly connected to the bottom of the mounting blocks (153), anti-skid patterns are formed in the bottom of the damping pad (154), the damping pad (154) is movably connected to the top of the detection table (2), bolts are connected to the inner wall of the mounting blocks (153) in a threaded manner, and the mounting blocks (153) and the damping pad (154) are mounted on the top of the detection table (2) through bolts.

6. The experimental bench for detecting the vibration of the rolling bearing according to claim 1, wherein the position adjusting mechanism (7) comprises a threaded rod (71) and a forward and reverse rotating motor (72), an output shaft of the forward and reverse rotating motor (72) is fixedly connected with one end of the threaded rod (71), the other end of the threaded rod (71) is rotatably connected with the inner wall of the chute (6), and the moving block (8) is in threaded connection with the surface of the threaded rod (71).

7. The rolling bearing vibration detection experiment table according to claim 6, wherein a support plate (18) is fixedly connected to the inner wall of the sliding groove (6), and one end of the threaded rod (71) is rotatably connected with the inner wall of the support plate (18).

8. The rolling bearing vibration detection experiment table according to claim 1, wherein the bracket mechanism (9) comprises a placing seat (91), the rolling bearing body (1) is movably connected to the inner wall of the placing seat (91), a push plate (92) and a limiting plate (93) are respectively arranged on the front surface and the back surface of the rolling bearing body (1), the push plate (92) and the limiting plate (93) are both fixedly connected to the inner wall of the placing seat (91), and the limiting plate (93) is sleeved on the surface of the mounting rod (16).

9. The rolling bearing vibration detection experiment table according to claim 8, wherein the bottom of the placing seat (91) is provided with two guiding mechanisms (19), the two guiding mechanisms (19) are mounted on the top of the detection table (2), and the two guiding mechanisms (19) are symmetrically arranged by taking a central vertical plane passing through the placing seat (91) as a symmetrical plane.

10. The experimental bench for vibration detection of rolling bearing according to claim 9, wherein the guiding mechanism (19) comprises a guiding block (191) and a guiding rail (192), the bottom of the placing seat (91) is provided with a connecting groove, the inner wall of the connecting groove is fixedly connected with the surface of the guiding block (191), the guiding block (191) is slidably connected with the surface of the guiding rail (192), the guiding rail (192) is fixedly connected with the top of the detection table (2), and both ends of the guiding rail (192) are fixedly connected with limiting blocks.

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