Detection tool for automobile window frame decoration strip

Abstract

The invention relates to the technical field of automobile production, and provides an automobile window frame decoration strip detection tool which comprises a frame body, the bottom end of the inner side of the frame body is fixedly connected with a placement seat, a positioning mechanism is arranged above the placement seat, the top end of the inner side of the frame body is provided with a detection mechanism, and the detection mechanism comprises two parallel guide rails. A movable seat is slidably connected between the two guide rails, a sliding block is slidably connected to the inner side of the movable seat, a hollow guide pipe is fixedly connected to the bottom of the sliding block, a detection piece is fixedly connected to the bottom of the hollow guide pipe, a guide plate is arranged on the inner side of the frame body, a guide groove matched with the decoration strip is formed in the guide plate, and a spring is fixedly connected to one end of the inner side of the movable seat. One end of the spring is fixedly connected with the sliding block, and one end of the top of the frame is provided with a translation mechanism. Through dynamic contour tracking, the problem of detection of the special-shaped decoration strip is thoroughly solved, technical breakthroughs are achieved in adaptability, precision and efficiency, and the automobile production quality control cost is remarkably reduced.

Description

Technical Field

[0001] This invention relates to the field of automobile manufacturing technology, specifically to a testing fixture for automobile window frame trim strips. Background Technology

[0002] Automotive window trim strips are an important component of a car body, primarily used to enhance the vehicle's aesthetics, sealing, and safety. In automotive manufacturing, these trim strips are typically installed along the edges of windows, serving functions such as dust and water protection, sound insulation, and wind noise reduction. Their streamlined design also enhances the overall sleekness and sophistication of the vehicle's appearance. The materials used for these trim strips are mostly rubber, plastic, or metal composites, requiring weather resistance, elasticity, and dimensional accuracy to ensure they do not deform or fail over long-term use. With the diversification of automotive designs, the shapes of trim strips have become increasingly complex, including straight lines, arcs, or composite curves (such as those found on C-pillars or rear window outlines), which places higher demands on quality control during the production process.

[0003] However, existing detection technologies have significant limitations when dealing with these complex shapes, specifically as follows: First, traditional tooling typically uses a fixed structure, relying on a static placement seat and a rigid detection probe. However, decorative strips come in various shapes (including straight lines, arcs, or complex curves), and the fixed-path detection mechanism cannot dynamically adapt to different contours, resulting in limited detection range, low accuracy, and even missed detection areas. Second, conventional scanners lack multi-dimensional dynamic adjustment capabilities (such as horizontal sliding and vertical oscillation), resulting in incomplete scanning coverage, especially insufficient detection of curved parts of decorative strips, which affects the defect identification rate.

[0004] In view of this, the present invention proposes a testing fixture for automotive window frame trim strips. Summary of the Invention

[0005] This invention proposes a testing fixture for automotive window frame decorative strips, which solves the problem in the prior art that it is impossible to dynamically adapt to the testing of decorative strips with different contours.

[0006] The technical solution of the present invention is as follows: A testing fixture for automotive window frame trim strips includes a frame body. A placement seat for placing the trim strip is fixedly connected to the bottom end of the frame body. A positioning mechanism for fixing the trim strip is provided above the placement seat. A testing mechanism is provided at the top end of the frame body. The testing mechanism includes two parallel guide rails, which are respectively fixedly connected to both ends of the frame body. A movable seat is slidably connected between the two guide rails. A slider is slidably connected to the inner side of the movable seat. A hollow guide tube is fixedly connected to the bottom of the slider. A testing component for testing the trim strip is fixedly connected to the bottom of the hollow guide tube. A guide plate is provided on the frame body. A guide groove matching the trim strip is opened on the guide plate. The hollow guide tube is clearance-fitted with the guide groove. A spring is fixedly connected to one end of the movable seat. One end of the spring is fixedly connected to the slider. A translation mechanism for intermittently sliding the movable seat is provided at one end of the top of the frame body.

[0007] Preferably, the detection element includes a mounting base fixedly connected to the bottom of the hollow conduit, a rotating seat rotatably connected to the bottom end of the mounting base, and a detection scanner fixedly connected to the bottom of the rotating seat.

[0008] Preferably, the detection component further includes a first bevel gear fixedly connected to the rotating seat on the same axis, a rotating shaft rotatably connected to the inner side of the hollow conduit and passing through the hollow conduit, a second bevel gear meshing with the first bevel gear fixedly connected to the bottom end of the rotating shaft, and a transmission component provided at the top end of the rotating shaft to drive the rotating shaft to reciprocate by cooperating with the activation of the translation mechanism.

[0009] Preferably, the translation mechanism includes a fixed plate fixedly connected to one end of the top of the movable seat, a motor fixedly installed on one side of the fixed plate, a first sector gear fixedly connected to the output shaft of the motor, and a toothed plate arranged parallel to the guide rail fixedly connected to the inner side of the frame. The first sector gear intermittently meshes with the toothed plate by rotation.

[0010] Preferably, the transmission assembly includes a third bevel gear fixedly connected to the top of the rotating shaft, a telescopic shaft rotatably connected to the bottom end of the fixed plate, a fourth bevel gear fixedly connected to one end of the telescopic shaft, the fourth bevel gear meshing with the third bevel gear, a transmission gear fixedly connected to the other end of the telescopic shaft, a second sector gear fixedly connected to the output shaft of the motor, the second sector gear intermittently meshing with the transmission gear through rotation, a torsion spring sleeved on the telescopic shaft, one end of the torsion spring welded to the fixed plate, and the other end of the torsion spring welded to the transmission gear.

[0011] Preferably, the number of teeth of the first sector gear is greater than the number of teeth of the second sector gear, and the teeth of the second sector gear and the first sector gear are staggered.

[0012] Preferably, the telescopic shaft includes a sleeve shaft rotatably connected to a fixed plate, one end of the sleeve shaft being fixedly connected to a transmission gear, the other end of the sleeve shaft being slidably connected to an insert shaft, a limit strip being fixedly connected to the outer side of the insert shaft, the limit strip being slidably connected to the inner wall of the sleeve shaft, and the end of the insert shaft away from the sleeve shaft being fixedly connected to a fourth bevel gear.

[0013] Preferably, the inner wall of the sleeve shaft is provided with a limiting groove along the axial direction, and the limiting strip is in clearance fit with the limiting groove.

[0014] Preferably, the placement base has several slots that match different decorative strips, and the slots are straight slots or arc-shaped slots.

[0015] Preferably, the positioning mechanism includes two cylinders fixedly connected to both ends of the frame, with pressure plates fixedly connected to the output ends of the two cylinders, and pressure blocks fixedly connected to the bottom of the pressure plates.

[0016] The working principle and beneficial effects of this invention are as follows: 1. Through replaceable guide plates and their customized guide grooves, precise matching with decorative strips of different shapes (straight / arc / compound curves) can be achieved. When the hollow guide tube slides along the guide groove, the spring provides dynamic longitudinal compensation force to ensure that the test piece always moves in close contact with the central axis of the decorative strip, avoiding the missed detection problem of traditional rigid testing.

[0017] 2. The placement seat has multiple slots (straight / arc slots) and, together with the replaceable guide plate, can be adapted to trim strips of multiple car models without overall tooling modification, reducing production changeover costs.

[0018] 3. The translation mechanism drives the movable seat to slide intermittently laterally along the guide rail, covering the length of the decorative strip; at the same time, the motor drives the second sector gear to intermittently mesh with the transmission gear, and with the help of the torsion spring, achieves automatic reset, so that the detection scanner expands the scanning coverage area in the longitudinal reciprocating swing, forming a composite detection path of "lateral translation + longitudinal swing", which especially optimizes the defect recognition rate of curved parts. Attached Figure Description

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0020] Figure 1 This is a schematic diagram of the structure of a testing fixture for automotive window frame decorative strips according to the present invention; Figure 2 This is a schematic diagram of the detection mechanism of the present invention; Figure 3 This is a schematic diagram of the structure of the detection element of the present invention; Figure 4 This is a schematic diagram of the translation mechanism of the present invention; Figure 5 This is a schematic diagram of the transmission component of the present invention; Figure 6 This is a schematic diagram of the telescopic shaft of the present invention; Figure 7 This is a schematic diagram of the structure of the placement base of the present invention; Figure 8 This is a schematic diagram of the positioning mechanism of the present invention.

[0021] In the diagram: 1. Frame; 2. Placement seat; 21. Slot; 3. Positioning mechanism; 31. Cylinder; 32. Pressure plate; 33. Pressure block; 4. Detection mechanism; 41. Guide rail; 42. Movable seat; 43. Hollow guide tube; 44. Detection piece; 441. Mounting seat; 442. Rotating seat; 443. Detection scanner; 444. First bevel gear; 445. Rotating shaft; 446. Second bevel gear; 45. Guide plate; 451. Guide groove; 4 6. Slider; 47. Translation mechanism; 471. Gear plate; 472. Fixing plate; 473. Motor; 474. First sector gear; 48. Spring; 49. Transmission assembly; 491. Third bevel gear; 492. Telescopic shaft; 4921. Sleeve shaft; 4922. Insert shaft; 4923. Limiting strip; 4924. Limiting groove; 493. Fourth bevel gear; 494. Second sector gear; 495. Transmission gear; 496. Torsion spring. Detailed Implementation

[0022] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0023] like Figures 1 to 8As shown, this embodiment proposes a testing fixture for automotive window frame trim strips, including a frame 1. A placement seat 2 for placing the trim strip is fixedly connected to the bottom inner side of the frame 1. A positioning mechanism 3 for fixing the trim strip is provided above the placement seat 2. A testing mechanism 4 is provided at the top inner side of the frame 1. The testing mechanism 4 includes two parallel guide rails 41, which are fixedly connected to both ends of the inner side of the frame 1. A movable seat 42 is slidably connected between the two guide rails 41, and a slider 46 is slidably connected to the inner side of the movable seat 42. A hollow conduit 43 is fixedly connected to the bottom of the slider 46. A detection piece 44 for detecting the decorative strip is fixedly connected to the bottom of the hollow conduit 43. A guide plate 45 is bolted to the inside of the frame 1. A guide groove 451 matching the decorative strip is opened on the guide plate 45. The hollow conduit 43 and the guide groove 451 are clearance-fitted. A spring 48 is fixedly connected to one end of the inner side of the movable seat 42. One end of the spring 48 is fixedly connected to the slider 46. A translation mechanism 47 for driving the movable seat 42 to slide intermittently is provided at one end of the top of the frame 1.

[0024] By placing the decorative strip to be tested on the placement seat 2 and fixing it with the positioning mechanism 3, the translation mechanism 47 is activated to drive the movable seat 42 to slide intermittently laterally along the guide rail 41, so that the slider 46 follows the movable seat 42 to move laterally, and the hollow tube 43 slides along the guide groove 451. Since the guide groove 451 matches the decorative strip, and under the dynamic compensation of the spring 48, the hollow tube 43 will move along the central axis of the decorative strip, so that the test piece 44 is dynamically tested along the central axis of the decorative strip. In this way, by changing the guide plate 45 with different shapes of guide groove 451, the test of decorative strips of different shapes can be achieved, which greatly improves the adaptability of the test fixture.

[0025] Furthermore, the detection component 44 includes a mounting base 441 fixedly connected to the bottom of the hollow conduit 43. A rotating seat 442 is rotatably connected to the bottom end of the mounting base 441. A detection scanner 443 is fixedly connected to the bottom of the rotating seat 442. A first bevel gear 444 is coaxially fixedly connected to the rotating seat 442. A rotating shaft 445 is rotatably connected to the inside of the hollow conduit 43, penetrating the hollow conduit 43. A second bevel gear 446 that meshes with the first bevel gear 444 is fixedly connected to the bottom end of the rotating shaft 445. A transmission component 49 is provided at the top end of the rotating shaft 445 to drive the rotating shaft 445 to reciprocate by cooperating with the activation of the translation mechanism 47.

[0026] The translation mechanism 47 drives the rotating shaft 445 to reciprocate, causing the second bevel gear 446 to rotate synchronously. This causes the first bevel gear 444 to rotate, which in turn causes the rotating seat 442 to oscillate back and forth. This causes the inspection scanner 443 to oscillate longitudinally, which greatly increases the scanning range of the inspection scanner 443. In addition, the lateral movement of the movable seat 42 allows the inspection range to completely cover the decorative strip, greatly improving the inspection effect on the decorative strip.

[0027] Furthermore, the translation mechanism 47 includes a fixed plate 472 fixedly connected to one end of the top of the movable seat 42. A motor 473 is fixedly installed on one side of the fixed plate 472. A first sector gear 474 is fixedly connected to the output shaft of the motor 473. A toothed plate 471 parallel to the guide rail 41 is fixedly connected to the inner side of the frame 1. The first sector gear 474 intermittently meshes with the toothed plate 471 by rotation.

[0028] The motor 473 drives the first sector gear 474 to rotate. When the first sector gear 474 meshes with the toothed plate 471, the toothed plate 471 applies a meshing thrust to the first sector gear 474. The thrust is then transmitted to the movable seat 42, causing the movable seat 42 to slide. When the first sector gear 474 disengages from the toothed plate 471, the movable seat 42 stops sliding. This cycle repeats, allowing the movable seat 42 to slide intermittently laterally along the guide rail 41. This causes the slider 46 to follow the movable seat 42 and move laterally, allowing the hollow guide tube 43 to slide along the guide groove 451. Since the guide groove 451 matches the decorative strip, and with the dynamic compensation of the spring 48, the hollow guide tube 43 will move along the central axis of the decorative strip, allowing the detection piece 44 to perform dynamic detection along the central axis of the decorative strip. In this way, the detection of different shaped decorative strips can be achieved by replacing the guide plate 45 with different shaped guide grooves 451.

[0029] Furthermore, the transmission assembly 49 includes a third bevel gear 491 fixedly connected to the top of the rotating shaft 445, a telescopic shaft 492 rotatably connected to the bottom end of the fixed plate 472, a fourth bevel gear 493 fixedly connected to one end of the telescopic shaft 492, the fourth bevel gear 493 meshing with the third bevel gear 491, a transmission gear 495 fixedly connected to the other end of the telescopic shaft 492, a second sector gear 494 fixedly connected to the output shaft of the motor 473, the second sector gear 494 intermittently meshing with the transmission gear 495 through rotation, a torsion spring 496 sleeved on the telescopic shaft 492, one end of the torsion spring 496 welded to the fixed plate 472, and the other end of the torsion spring 496 welded to the transmission gear 495, the number of teeth of the first sector gear 474 being greater than the number of teeth of the second sector gear 494, and the teeth of the second sector gear 494 being staggered from those of the first sector gear 474.

[0030] By starting the motor 473, the second sector gear 494 will rotate synchronously. When the second sector gear 494 meshes with the transmission gear 495, the transmission gear 495 will rotate. At this time, the torsion spring 496 is wound up and accumulates potential energy. When the second sector gear 494 disengages from the transmission gear 495, the torsion spring 496 will release potential energy and cause the transmission gear 495 to rotate in the opposite direction. This cycle repeats, and the transmission gear 495 will rotate back and forth, which will cause the telescopic shaft 492 to drive the fourth bevel gear 493 to rotate back and forth. This will cause the third bevel gear 491 to drive the rotating shaft 445 to rotate back and forth, causing the second bevel gear 446 to rotate synchronously. This will cause the first bevel gear 444 to rotate, which will cause the rotating seat 442 to swing back and forth. This will cause the inspection scanner 443 to swing back and forth longitudinally. This can greatly improve the scanning range of the inspection scanner 443. In addition, with the lateral movement of the movable seat 42, the detection range can completely cover the decorative strip, greatly improving the detection effect of the decorative strip.

[0031] Furthermore, the telescopic shaft 492 includes a sleeve shaft 4921 rotatably connected to the fixed plate 472. One end of the sleeve shaft 4921 is fixedly connected to the transmission gear 495, and the other end of the sleeve shaft 4921 is slidably connected to an insert shaft 4922. A limit strip 4923 is fixedly connected to the outer side of the insert shaft 4922. The limit strip 4923 is slidably connected to the inner wall of the sleeve shaft 4921. The end of the insert shaft 4922 away from the sleeve shaft 4921 is fixedly connected to the fourth bevel gear 493. A limit groove 4924 is formed on the inner wall of the sleeve shaft 4921 along the axial direction. The limit strip 4923 and the limit groove 4924 are in clearance fit.

[0032] The sliding design of the sleeve shaft 4921 and the insertion shaft 4922 can dynamically adapt to the length of the telescopic shaft 492 when the slider 46 slides longitudinally. The design of the limiting bar 4923 can keep the sleeve shaft 4921 rotating synchronously during the sliding process of the insertion shaft 4922. This can ensure the stable transmission of power and greatly improve the stability of the structure.

[0033] Furthermore, the placement seat 2 is provided with several slots 21 that match different decorative strips. The slots 21 are straight or curved. Different shapes of the slots 21 can be adapted to decorative strips of different shapes. In this way, the detection of decorative strips of different shapes can be achieved by changing the guide plates 45 of the guide slots 451 of different shapes, which greatly improves the adaptability of the detection fixture.

[0034] Furthermore, the positioning mechanism 3 includes two cylinders 31 fixedly connected to both ends of the frame 1, with pressure plates 32 fixedly connected to the output ends of the two cylinders 31, and pressure blocks 33 fixedly connected to the bottom of the pressure plates 32.

[0035] Working principle: By placing the decorative strip to be tested into the slot 21 of the placement seat 2, and then controlling the two cylinders 31 to drive the pressure plate 32 to move downward, so that the pressure block 33 moves downward and presses one end of the decorative strip. The starter motor 473 drives the first sector gear 474 to rotate. When the first sector gear 474 meshes with the toothed plate 471, the toothed plate 471 applies a meshing thrust to the first sector gear 474. The thrust is then transmitted to the movable seat 42, causing the movable seat 42 to slide. When the first sector gear 474 disengages from the toothed plate 471, the movable seat 42 stops sliding. This cycle repeats, and the movable seat 42 can slide intermittently laterally along the guide rail 41, causing the slider 46 to follow the movable seat 42 to move laterally. This causes the hollow tube 43 to slide along the guide groove 451. Since the guide groove 451 matches the decorative strip, and under the dynamic compensation of the spring 48, the hollow tube 43 will move along the central axis of the decorative strip, causing the detection piece 44 to perform dynamic detection along the central axis of the decorative strip. In this way, the detection of different shaped decorative strips can be achieved by replacing the guide plate 45 with different shaped guide grooves 451. When the motor 473 starts, the second sector gear 494 rotates synchronously. When the second sector gear 494 meshes with the transmission gear 495, the transmission gear 495 rotates. At this time, the torsion spring 496 is wound up and accumulates potential energy. When the second sector gear 494 disengages from the transmission gear 495, the torsion spring 496 releases potential energy and causes the transmission gear 495 to rotate in the opposite direction. This cycle repeats, and the transmission gear 495 reciprocates, causing the telescopic shaft 492 to drive the fourth bevel gear 493 to reciprocate. This causes the third bevel gear 491 to drive the rotating shaft 445 to reciprocate, causing the second bevel gear 446 to rotate synchronously. This causes the first bevel gear 444 to rotate, which in turn causes the rotating seat 442 to oscillate back and forth. This causes the inspection scanner 443 to oscillate longitudinally, which greatly increases the scanning range of the inspection scanner 443. In addition, the lateral movement of the movable seat 42 allows the inspection range to completely cover the decorative strip, greatly improving the inspection effect on the decorative strip.

[0036] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An automobile window frame decoration strip detection tool, comprising a frame body (1), a placing seat (2) for placing the decoration strip is fixedly connected to the bottom end of the inner side of the frame body (1), a positioning mechanism (3) for fixing the decoration strip is arranged above the placing seat (2), characterized in that, The top end of the inner side of the frame body (1) is provided with a detection mechanism (4), the detection mechanism (4) comprises two parallel guide rails (41), two guide rails (41) are respectively fixedly connected to both ends of the inner side of the frame body (1), and the two guide rails (41) are slidably connected with a movable seat (42), the inner side of the movable seat (42) is slidably connected with a sliding block (46), the bottom of the sliding block (46) is fixedly connected with a hollow conduit (43), the bottom of the hollow conduit (43) is fixedly connected with a detection piece (44) for detecting the decorative strip, the inner side of the frame body (1) is provided with a guide plate (45), the guide plate (45) is provided with a guide groove (451) matched with the decorative strip, the hollow conduit (43) is matched with the guide groove (451) in a clearance fit, one end of the inner side of the movable seat (42) is fixedly connected with a spring (48), one end of the spring (48) is fixedly connected with the sliding block (46), and one end of the top of the frame body (1) is provided with a translation mechanism (47) for driving the movable seat (42) to slide intermittently.

2. The detection tool for a window frame molding of a vehicle according to claim 1, wherein The detection piece (44) comprises a mounting seat (441) fixedly connected to the bottom of the hollow conduit (43), and the bottom of the mounting seat (441) is rotatably connected with a rotating seat (442), and the bottom of the rotating seat (442) is fixedly connected with a detection scanner (443).

3. The detection tool for a window frame molding of a vehicle according to claim 2, wherein The detection piece (44) further comprises a first bevel gear (444) fixedly connected with the rotating seat (442), the inner side of the hollow conduit (43) is rotatably connected with a rotating shaft (445) penetrating through the hollow conduit (43), the bottom end of the rotating shaft (445) is fixedly connected with a second bevel gear (446) engaged with the first bevel gear (444), and the top end of the rotating shaft (445) is provided with a transmission assembly (49) driven by the starting of the translation mechanism (47) to drive the rotating shaft (445) to reciprocatingly rotate.

4. The detection tool for a window frame molding of a vehicle according to claim 3, wherein The translation mechanism (47) comprises a fixed plate (472) fixedly connected to one end of the top of the movable seat (42), one side of the fixed plate (472) is fixedly installed with a motor (473), the output shaft of the motor (473) is fixedly connected with a first sector gear (474), the inner side of the frame body (1) is fixedly connected with a toothed plate (471) arranged in parallel with the guide rail (41), and the first sector gear (474) is intermittently engaged with the toothed plate (471) by rotation.

5. The detection tool for a window frame molding of a vehicle according to claim 4, wherein The transmission assembly (49) comprises a third bevel gear (491) fixedly connected at the top of the rotating shaft (445), the bottom end of the fixed plate (472) is rotatably connected with an extension shaft (492), one end of the extension shaft (492) is fixedly connected with a fourth bevel gear (493), the fourth bevel gear (493) is engaged with the third bevel gear (491), the other end of the extension shaft (492) is fixedly connected with a transmission gear (495), the output shaft of the motor (473) is also fixedly connected with a second sector gear (494), the second sector gear (494) is intermittently engaged with the transmission gear (495) through rotation, the extension shaft (492) is sleeved with a torsional spring (496), one end of the torsional spring (496) is welded with the fixed plate (472), the other end of the torsional spring (496) is welded with the transmission gear (495).

6. The detection tool for a window frame molding of a vehicle according to claim 5, wherein The number of teeth of the first sector gear (474) is greater than that of the second sector gear (494), and the second sector gear (494) is arranged in a staggered manner with the tooth part of the first sector gear (474).

7. The detection tool for a window frame molding of a vehicle according to claim 5, wherein The extension shaft (492) comprises a sleeve shaft (4921) rotatably connected with the fixed plate (472), one end of the sleeve shaft (4921) is fixedly connected with the transmission gear (495), the other end of the sleeve shaft (4921) is slidably connected with a plug shaft (4922), the outer side of the plug shaft (4922) is fixedly connected with a limiting strip (4923), the limiting strip (4923) is slidably connected with the inner wall of the sleeve shaft (4921), and the end of the plug shaft (4922) away from the sleeve shaft (4921) is fixedly connected with the fourth bevel gear (493).

8. The detection tool for a window frame molding of a vehicle according to claim 7, wherein The inner wall of the sleeve shaft (4921) is provided with a limiting groove (4924) along the axis direction, and the limiting strip (4923) is matched with the limiting groove (4924) in a gap.

9. The detection tool for a window frame molding of a vehicle according to claim 1, wherein A plurality of clamping grooves (21) matched with different decorative strips are formed in the placing seat (2), and the clamping grooves (21) are linear grooves or arc grooves.

10. The detection tool for a window frame molding of a vehicle according to claim 1, wherein The positioning mechanism (3) comprises two air cylinders (31) fixedly connected at both ends of the frame body (1), the output ends of the two air cylinders (31) are fixedly connected with pressing plates (32), and the bottom of each pressing plate (32) is fixedly connected with a pressing block (33).

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