A defect detection device for plastic furniture production

Abstract

The application discloses a kind of defect detection devices for plastic furniture production, it is related to defect detection field, it solves the problem that existing defect detection device is easy to cause incomplete detection, including: detection box and belt conveying frame, the top of belt conveying frame is provided with plastic bucket, the top of plastic bucket is provided with two U-shaped frames, the both ends of U-shaped frame bottom are all installed with first laser probe, and top plate is installed between two U-shaped frames;Further including: detection mechanism, for the inside and outside of plastic bucket synchronous detection, detection mechanism is installed in the inside of detection box, and detection mechanism includes mounting bracket installed in the inside of detection box;The application can make top plate do circular motion in the process of moving downward by detection mechanism, and the inside and outside of plastic bucket can be synchronously detected by the first laser probe at the both ends of U-shaped frame, so as to facilitate the inside and outside of plastic bucket synchronous and fast detection.

Description

Technical Field

[0001] This invention relates to the field of defect detection, specifically a defect detection device for the production of plastic furniture. Background Technology

[0002] Plastic furniture is a type of furniture made primarily from synthetic or natural polymer compounds through molding. It is popular among consumers due to its bright colors, diverse shapes, lightweight and compact design, wide applicability, and ease of maintenance.

[0003] In the production of plastic furniture, plastic trash cans require defect inspection after manufacturing. If obvious surface defects are not detected, the appearance of the trash can will be affected when additional printing or decoration is added later, impacting its overall integrity and sales. Existing inspection devices transport the trash can into an inspection chamber and use laser probes to scan the outside of the can to determine if defects exist. However, laser probes are typically located on the sides and top of the inspection chamber. Furthermore, since plastic trash cans are usually not transparent, if the inner wall is relatively vertical, the vertical laser probes cannot scan the inside of the trash can. Additionally, the front and back of the trash can are difficult to scan with side laser probes, leading to incomplete scans. Summary of the Invention

[0004] The purpose of this invention is to provide a defect detection device for the production of plastic furniture, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A defect detection device for plastic furniture production includes: a detection chamber and a belt conveyor frame fixedly installed on the inner wall of the bottom of the detection chamber. A plastic bucket is placed on top of the belt conveyor frame, and two symmetrically distributed U-shaped frames are arranged above the plastic bucket. A first laser probe is installed at both ends of the bottom of each U-shaped frame, and a top plate is fixedly installed between the two U-shaped frames. The device also includes: a detection mechanism for simultaneously detecting the inner and outer sides of the plastic bucket. The detection mechanism is installed inside the detection chamber and includes a mounting frame fixedly installed inside the detection chamber. The mounting bracket enables the four first laser probes to rotate and move downwards; a lifting mechanism is used to detect the bottom of the plastic bucket, the lifting mechanism is installed inside the detection box, the lifting mechanism includes a movable frame slidably installed inside the mounting bracket, the movable frame is capable of lifting the plastic bucket; a side-pushing mechanism is used to center the plastic bucket on the belt conveyor frame, the side-pushing mechanism is installed inside the belt conveyor frame, the side-pushing mechanism includes two guide plates symmetrically arranged inside the belt conveyor frame, the two guide plates can provide guidance for the movement of the plastic bucket.

[0007] Preferably, the detection mechanism further includes two positioning plates symmetrically fixedly installed inside the mounting frame. Each positioning plate is rotatably mounted with a screw between itself and the top inner wall of the mounting frame. An annular frame is provided inside the mounting frame, and an optical shaft for limiting the sliding of the annular frame is installed between the mounting frame and the positioning plates. Both ends of the annular frame are respectively engaged with the two screws. A mounting ring is fixedly installed at the bottom of the annular frame, and a positioning slip ring is fixedly installed at the bottom of the mounting ring. Two symmetrically distributed sleeves are fixedly installed on the top of the top plate, and the sleeves are slidably installed outside the positioning slip rings. A sleeve is fixedly installed inside the top plate. A fixing rod is fixedly installed on the top inner wall of the mounting frame, and the sleeve is slidably installed outside the fixing rod. Two centrally symmetrically distributed spiral strips are fixedly installed inside the sleeve, and a spiral groove cooperating with the spiral strips is opened on the outer side of the fixing rod.

[0008] Preferably, the lifting mechanism further includes a driven rod fixedly installed at the bottom end of the screw. The end of the driven rod away from the screw is rotatably installed at the bottom of the mounting frame. An external thread is provided on the outer side of the driven rod. The pitch of the external thread on the driven rod is smaller than the pitch of the thread on the screw, and the helical direction of the external thread on the driven rod is opposite to the helical direction of the thread on the screw. The two ends of the movable frame are respectively threaded onto the external threads of the two driven rods. Two lifting plates are provided on the top of the movable frame. Two symmetrically distributed support rods are fixedly installed between the bottom of the lifting plates and the movable frame. Two symmetrically distributed second laser probes are fixedly installed on the top of the movable frame.

[0009] Preferably, the side-pushing mechanism further includes two push rods symmetrically fixedly installed on the top of the movable frame. A push block is fixedly installed on the top of the push rod. An installation plate is provided on the side of the guide plate near the push block. A push ball that contacts the push block is fixedly installed on the side of the installation plate near the push block. The side of the push block near the push ball has an inclined structure. Two symmetrically distributed slide rods are fixedly installed on the side of the installation plate away from the push ball. A stop block is fixedly installed at the end of the slide rod away from the installation plate. A cavity is opened inside the guide plate for the stop block and the slide rod to slide in a limited manner. Two springs are fixedly installed between the installation plate and the guide plate. Both sides of the guide plate have an inclined structure.

[0010] Preferably, two symmetrically distributed protective pads are fixedly installed at the bottom of the top plate.

[0011] Preferably, a timing belt is rotatably mounted between the two screws, the timing belt is located inside the mounting frame, a drive motor is fixedly mounted on the top of the mounting frame, and the output end of the drive motor is fixedly connected to the top end of the adjacent screw.

[0012] Preferably, a limiting ring is fixedly installed at the bottom end of the screw, and a limiting groove for installing the limiting ring is provided at the bottom of the positioning plate.

[0013] Preferably, the lifting plate is made of transparent material, and an anti-slip pad is fixedly installed on the top of the lifting plate.

[0014] Preferably, two symmetrically distributed L-shaped support plates are fixedly installed on the bottom outer side of the guide plate, and the top of the L-shaped support plates is in contact with the bottom of the mounting plate.

[0015] Preferably, two symmetrically distributed guide plates are fixedly installed on the outer side of the push block, and the distance between the two guide plates is greater than the outer diameter of the push ball.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. The present invention, through a detection mechanism, enables the top plate to move downwards, causing the two U-shaped frames to perform circular motion. The first laser probes at both ends of the U-shaped frames can simultaneously detect the inner and outer sides of the plastic bucket, thereby facilitating simultaneous and rapid detection of the outer and inner sides of the plastic bucket and improving the accuracy of defect detection of the plastic bucket.

[0018] 2. The present invention uses a lifting mechanism to move the moving frame upward during the movement of the top frame. The moving frame passes the lifting plate through the belt conveyor frame and contacts the bottom of the plastic bucket, thus lifting the plastic bucket. This facilitates the two second laser probes to perform defect detection on the bottom of the plastic bucket, thereby achieving the effect of comprehensive defect detection.

[0019] 3. The present invention, through the side-pushing mechanism, enables the push block on the push rod to push the push ball to move during the upward movement of the moving frame. The push ball can then push the two slide rods on the mounting plate to move along the cavity of the guide plate, so that the abutment blocks at the ends of the four slide rods simultaneously contact the outer side of the plastic bucket, thereby achieving the centering positioning of the plastic bucket and preventing the first laser probe from colliding with the plastic bucket when the U-shaped frame moves downward, thus facilitating the rapid detection of the plastic bucket. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the mounting frame and plastic bucket structure in this invention;

[0022] Figure 3 This is a schematic diagram of the U-shaped frame and the first laser probe structure in this invention;

[0023] Figure 4 This is a schematic diagram of the ring frame and positioning plate structure in this invention;

[0024] Figure 5 This is a schematic diagram of the sleeve and positioning slip ring structure in this invention;

[0025] Figure 6 This is a schematic diagram of the fixed rod and spiral bar structure in this invention;

[0026] Figure 7 This is a schematic diagram of the lifting plate and the second laser probe structure in this invention;

[0027] Figure 8 This is a schematic diagram of the abutment block and slide bar structure in this invention.

[0028] In the diagram: 1. Detection box; 2. Belt conveyor frame; 3. Plastic bucket; 4. U-shaped frame; 5. First laser probe; 6. Top plate; 7. Mounting frame; 8. Moving frame; 9. Guide plate; 10. Positioning plate; 11. Screw; 12. Ring frame; 13. Mounting ring; 14. Positioning slip ring; 15. Sleeve; 16. Sleeve; 17. Fixed rod; 18. Spiral strip; 19. Driven rod; 20. Lifting plate; 21. Support rod; 22. Second laser probe; 23. Push rod; 24. Push block; 25. Mounting plate; 26. Push ball; 27. Sliding rod; 28. Abutment block; 29. ​​Spring; 30. Protective pad; 31. Synchronous belt; 32. Drive motor; 33. Limit ring; 34. Anti-slip pad; 35. L-shaped support plate; 36. Guide plate. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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 skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Example 1: Please refer to Figures 1-8 The diagram shows a defect detection device for plastic furniture production, comprising a detection chamber 1 and a belt conveyor 2 fixedly installed on the inner wall of the bottom of the detection chamber 1. A plastic bucket 3 is mounted on the top of the belt conveyor 2, which can transport the plastic bucket 3 to the inside of the detection chamber 1. Two symmetrically distributed U-shaped frames 4 are arranged above the plastic bucket 3. A first laser probe 5 is installed at both ends of the bottom of the U-shaped frame 4. A top plate 6 is fixedly installed between the two U-shaped frames 4. The first laser probes 5 on the two U-shaped frames 4 can respectively perform defect detection on the outer and inner sides of the plastic bucket 3. The device also includes a detection mechanism for simultaneously detecting the inner and outer sides of the plastic bucket 3, which is installed inside the detection chamber 1.

[0031] The detection mechanism includes a mounting frame 7 fixedly installed inside the detection housing 1. The mounting frame 7 allows four first laser probes 5 to rotate and move downwards. The detection mechanism also includes two positioning plates 10 symmetrically fixedly installed inside the mounting frame 7. Screws 11 are rotatably installed between the two positioning plates 10 and the top inner wall of the mounting frame 7. A ring frame 12 is provided inside the mounting frame 7, and an optical axis for limiting the sliding of the ring frame 12 is installed between the mounting frame 7 and the positioning plates 10. The two ends of the ring frame 12 are respectively engaged with the two screws 11, so that when the two screws 11 rotate, they can drive the ring frame 12 to move along the outer side of the optical axis. A mounting ring 13 is fixedly installed at the bottom of the ring frame 12, and a mounting ring 13 is fixedly installed at the bottom of the mounting ring 13. A positioning slip ring 14 is provided. Two symmetrically distributed sleeves 15 are fixedly installed on the top of the top plate 6. The sleeves 15 are slidably installed on the outer side of the positioning slip ring 14, allowing the positioning slip ring 14 and the two sleeves 15 to stably suspend the top plate 6 below the annular frame 12. When the annular frame 12 moves, the positioning slip ring 14 and the sleeves 15 can push the top plate 6 to move synchronously. A sleeve 16 is fixedly installed on the inner side of the top plate 6. A fixing rod 17 is fixedly installed on the inner top wall of the mounting frame 7. The sleeve 16 is slidably installed on the outer side of the fixing rod 17. Two centrally symmetrically distributed spiral strips 18 are fixedly installed on the inner side of the sleeve 16. A spiral groove is provided on the outer side of the fixing rod 17 to cooperate with the spiral strips 18, allowing the top plate 6 to drive the sleeve 16. When the sleeve 16 moves downward along the outside of the fixed rod 17, the spiral strip 18 on the sleeve 16 can move along the spiral groove on the fixed rod 17, causing the spiral strip 18 to drive the sleeve 16 to rotate. The sleeve 16 can then drive the sleeve seat 15 on the top plate 6 to make a circular motion along the outside of the positioning slip ring 14, so that the top plate 6 is in a rotating state during the vertical movement. The top plate 6 can then drive the two ends of the U-shaped frame 4 to move downward and make a circular motion close to the outside and inside of the plastic bucket 3, respectively. The first laser probes 5 at both ends of the U-shaped frame 4 can simultaneously detect the inside and outside of the plastic bucket 3. Two symmetrically distributed protective pads 30 are fixedly installed at the bottom of the top plate 6, so that when the top plate 6 contacts the top of the plastic bucket 3, The protective pad 30 can provide protection for the top of the plastic bucket 3. A synchronous belt 31 is rotatably installed between the two screws 11. The synchronous belt 31 is located inside the mounting frame 7. A drive motor 32 is fixedly installed on the top of the mounting frame 7, and the output end of the drive motor 32 is fixedly connected to the top of the adjacent screw 11, so that the drive motor 32 can drive the corresponding screw 11 to rotate, and drive the other screw 11 to rotate synchronously through the synchronous belt 31, which facilitates the rapid adjustment of the height of the ring frame 12. A limit ring 33 is fixedly installed at the bottom of the screw 11. The bottom of the positioning plate 10 is provided with a limit groove for the limit ring 33 to be installed, so that the limit ring 33 provides support for the rotation of the screw 11 and improves the stability of the rotation of the screw 11.

[0032] Example 2: Please refer to Figures 3-7This embodiment further illustrates Example 1. The lifting mechanism shown in the figure includes a movable frame 8 slidably mounted inside the mounting frame 7. The movable frame 8 can lift the plastic bucket 3. The lifting mechanism also includes a driven rod 19 fixedly mounted at the bottom end of the screw 11. The end of the driven rod 19 away from the screw 11 is rotatably mounted at the bottom of the mounting frame 7. An external thread is provided on the outer side of the driven rod 19. The pitch of the external thread on the driven rod 19 is smaller than the pitch of the thread on the screw 11, and the helical direction of the external thread on the driven rod 19 is opposite to the helical direction of the thread on the screw 11. The two ends of the movable frame 8 are respectively threaded onto the external threads of the two driven rods 19, so that when the screw 11 rotates, it can drive the driven rods 19 to rotate synchronously. The two driven rods 19 drive the movable frame 8 to move upward along the inner side of the mounting frame 7 through the external threads, and the moving speed of the movable frame 8 is less than the moving speed of the ring frame 12. The top of the movable frame 8 is provided with Two lifting plates 20 are provided. Two symmetrically distributed support rods 21 are fixedly installed between the bottom of the lifting plates 20 and the moving frame 8. When the moving frame 8 moves upward, the support rods 21 push the lifting plates 20 upward. The lifting plates 20 pass through the belt conveyor frame 2 and contact the bottom of the plastic bucket 3, lifting the plastic bucket 3 and moving it away from the belt conveyor frame 2. Two symmetrically distributed second laser probes 22 are fixedly installed on the top of the moving frame 8. When the moving frame 8 moves, the second laser probes 22 move synchronously, allowing the second laser probes 22 to pass through the belt conveyor frame 2 and perform defect detection on the bottom of the lifted plastic bucket 3. The second laser probes 22 can work with the first laser probe 5 to achieve a comprehensive inspection of the plastic bucket 3. The lifting plates 20 are made of transparent material, and an anti-slip pad 34 is fixedly installed on the top of the lifting plates 20. The lifting plates 20 contact the bottom of the plastic bucket 3 through the anti-slip pad 34 to prevent the plastic bucket 3 from shifting.

[0033] Example 3: Please refer to Figures 2-8This embodiment further illustrates other embodiments. The side-pushing mechanism shown in the figure includes two guide plates 9 symmetrically arranged inside the belt conveyor frame 2. The two guide plates 9 can provide guidance for the movement of the plastic bucket 3. The side-pushing mechanism also includes two push rods 23 symmetrically fixedly installed on the top of the movable frame 8. A push block 24 is fixedly installed on the top of the push rod 23. A mounting plate 25 is provided on the side of the guide plate 9 near the push block 24. A push ball 26 that contacts the push block 24 is fixedly installed on the side of the mounting plate 25 near the push block 24. The side of the push block 24 near the push ball 26 has an inclined structure. The mounting plate 25 is far from the push ball 26. Two symmetrically distributed sliding rods 27 are fixedly installed on one side away from the push ball 26. A stop block 28 is fixedly installed at the end of the sliding rod 27 away from the mounting plate 25. The guide plate 9 has a cavity inside for the stop block 28 and the sliding rod 27 to slide and limit their movement. When the moving frame 8 moves upward, the push rod 23 drives the push block 24 to move synchronously. The inclined surface of the push block 24 pushes the push ball 26 to move, causing the push ball 26 to drive the sliding rod 27 on the mounting plate 25 to move along the cavity of the guide plate 9. The sliding rod 27 then drives the stop block 28 to contact the outside of the plastic bucket 3, aligning the four stop blocks 28 centrally with the plastic bucket 3. To prevent the first laser probe 5 from colliding with the outer or inner side of the plastic bucket 3, two springs 29 are fixedly installed between the mounting plate 25 and the guide plate 9. When the mounting plate 25 moves, the springs 29 are compressed. When the push block 24 moves away from the push ball 26, the spring force of the springs 29 allows the mounting plate 25 to return to its original position. Both sides of the guide plate 9 have inclined surfaces, so that when the belt conveyor 2 transports the plastic bucket 3, the outer side of the plastic bucket 3 contacts the inclined surfaces of the two guide plates 9, facilitating the movement of the plastic bucket 3 between the two guide plates 9. Four abutments 28 then center the plastic bucket 3. The bottom of the guide plate 9... Two symmetrically distributed L-shaped support plates 35 are fixedly installed on the outer side. The top of the L-shaped support plates 35 contacts the bottom of the mounting plate 25, allowing the mounting plate 25 to move along the top of the two L-shaped support plates 35, providing support for the bottom of the mounting plate 25 and improving the stability of the movement of the mounting plate 25. Two symmetrically distributed guide plates 36 are fixedly installed on the outer side of the push block 24, and the distance between the two guide plates 36 is greater than the outer diameter of the push ball 26, so that when the push block 24 contacts the push ball 26, the push ball 26 can be positioned between the two guide plates 36, preventing the push ball 26 from being misaligned with the push block 24.

[0034] Working principle: First, the operator places the plastic bucket 3 at the front end of the belt conveyor 2, causing the belt conveyor 2 to move the plastic bucket 3 into the interior of the detection box 1. The outer side of the plastic bucket 3 contacts the inclined surfaces of the two guide plates 9, moving the plastic bucket 3 between the two guide plates 9. At this time, the belt conveyor 2 stops running, and the drive motor 32 starts. The drive motor 32 drives the corresponding screw 11 to rotate. The screw 11, in conjunction with the synchronous belt 31, drives another screw 11 to rotate synchronously. The two screws 11 drive the corresponding driven rod 19 to rotate synchronously, causing the driven rod 19 to drive the moving frame 8 to move upward along the inner side of the mounting frame 7 through the external thread. The moving frame 8 drives the two push rods. 23 moves upward synchronously, and the two push rods 23 drive the corresponding push blocks 24 to move synchronously. The inclined surface of the push block 24 pushes the push ball 26 to move, so that the push ball 26 drives the slide rod 27 on the mounting plate 25 to move along the cavity of the guide plate 9. The abutment block 28 at the end of the slide rod 27 contacts the outer side of the plastic bucket 3, so that the four abutment blocks 28 are aligned with the center of the plastic bucket 3, and the plastic bucket 3 can be in the middle position of the two guide plates 9. At the same time, the two screws 11 drive the ring frame 12 to move downward along the optical axis between the mounting frame 7 and the positioning plate 10. The ring frame 12 drives the two sleeves 15 to move through the positioning slip ring 14 on the mounting ring 13. The two sleeves 15 drive the top plate 6 As the top plate 6 moves downward, it drives the sleeve 16 to move downward along the outside of the fixed rod 17. The spiral strip 18 on the sleeve 16 moves along the spiral groove on the fixed rod 17, causing the spiral strip 18 to drive the sleeve 16 to rotate. The sleeve 16 then drives the top plate 6 to rotate. As the top plate 6 drives the two U-shaped frames 4 to move downward, the two ends of the U-shaped frames 4 are respectively close to the outside and inside of the plastic bucket 3 and make circular motions. This causes the two first laser probes 5 on the U-shaped frames 4 to rotate and move downward, respectively, to perform defect detection on the outside and inside of the plastic bucket 3. At the same time, the moving frame 8 pushes the lifting plate 20 upward through the support rod 21. The two lifting plates 20 pass through the belt conveyor frame 2 and the plastic bucket 3. The bottoms of the plastic buckets 3 and 4 come into contact, causing the two lifting plates 20 to lift the plastic buckets 3 away from the belt conveyor frame 2. At the same time, the moving frame 8 drives the two second laser probes 22 to move synchronously, allowing the second laser probes 22 to pass through the belt conveyor frame 2 and perform defect detection on the bottom of the lifted plastic buckets 3. Thus, the second laser probes 22, together with the first laser probe 5, achieve a comprehensive inspection of the plastic buckets 3. Finally, the drive motor 32 drives the screw 11 to rotate in the opposite direction, causing the U-shaped frame 4 and the lifting plates 20 to move away from the plastic buckets 3. The belt conveyor frame 2 then restarts, conveying the inspected plastic buckets 3 out of the conveyor. This completes the comprehensive defect inspection of the plastic buckets 3, thereby improving the accuracy of defect detection of the plastic buckets 3.

[0035] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0036] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A defect detection device for plastic furniture production, characterized in that, include: The detection chamber is equipped with a belt conveyor frame installed on the inner wall of the bottom of the detection chamber. A plastic bucket is installed on the top of the belt conveyor frame, and two U-shaped frames are installed above the plastic bucket. The first laser probe is installed at both ends of the bottom of the U-shaped frames, and a top plate is installed between the two U-shaped frames. Also includes: The testing mechanism is used to simultaneously test the inside and outside of a plastic bucket. The testing mechanism is installed inside the testing chamber and includes a mounting frame inside the chamber. The mounting frame allows four first laser probes to rotate and move downwards. Two positioning plates are installed inside the mounting frame, and screws are rotatably installed between the two positioning plates and the top inner wall of the mounting frame. A ring frame is provided inside the mounting frame, and an optical shaft for limiting the sliding of the ring frame is installed between the mounting frame and the positioning plates. The two ends of the ring frame are respectively engaged with two screws. The testing mechanism also includes a mounting ring installed at the bottom of the ring frame, with a positioning slip ring installed at the bottom. Two symmetrically distributed sleeves are installed on the top of the top plate, slidingly mounted on the outside of the positioning slip ring. A sleeve is fixedly installed inside the top plate. A fixing rod is fixedly installed on the top inner wall of the mounting frame, with the sleeve slidingly mounted on the outside of the fixing rod. Two spiral strips are fixedly installed inside the sleeve, and a spiral groove that mates with the spiral strips is opened on the outside of the fixing rod. A lifting mechanism for testing the bottom of the plastic bucket is also provided inside the testing chamber.

2. The defect detection device for plastic furniture production according to claim 1, characterized in that: The lifting mechanism includes a movable frame slidably mounted inside the mounting frame, which can lift the plastic bucket. A driven rod is installed at the bottom end of the screw, and one end of the driven rod is rotatably mounted at the bottom of the mounting frame. An external thread is provided on the outer side of the driven rod. The pitch of the external thread on the driven rod is smaller than the pitch of the thread on the screw, and the helical direction of the external thread on the driven rod is opposite to the helical direction of the thread on the screw. The two ends of the movable frame are respectively threaded onto the external threads of the two driven rods. Two lifting plates are provided on the top of the movable frame, and two support rods are installed between the bottom of the lifting plates and the movable frame. Two second laser probes are installed on the top of the movable frame. A side-pushing mechanism for centering the plastic bucket is also provided inside the belt conveyor frame.

3. A defect detection device for plastic furniture production according to claim 2, characterized in that: The side-pushing mechanism includes two guide plates located inside the belt conveyor frame. The two guide plates guide the movement of the plastic bucket. A push rod is installed on the top of the moving frame, and a push block is installed on the top of the push rod. A mounting plate is provided on one side of the guide plate. A push ball that contacts the push block is fixedly installed on one side of the mounting plate, and the side of the push block near the push ball has an inclined structure. Two symmetrically distributed sliding rods are fixedly installed on the other side of the mounting plate. A stop block is fixedly installed at one end of the sliding rod. A cavity is opened inside the guide plate for the stop block and the sliding rod to slide in a limited manner. Two springs are installed between the mounting plate and the guide plate. Both sides of the guide plate have an inclined structure.

4. A defect detection device for plastic furniture production according to claim 1, characterized in that: Two symmetrically distributed protective pads are fixedly installed at the bottom of the top plate.

5. A defect detection device for plastic furniture production according to claim 1, characterized in that: A synchronous belt is rotatably mounted between the two screws, and a drive motor is mounted on the top of the mounting bracket, with the output end of the drive motor fixedly connected to the top of the adjacent screw.

6. A defect detection device for plastic furniture production according to claim 1, characterized in that: A limit ring is fixedly installed at the bottom end of the screw, and a limit groove is formed at the bottom of the positioning plate.

7. A defect detection device for plastic furniture production according to claim 2, characterized in that: The lifting plate is made of transparent material, and an anti-slip pad is installed on the top of the lifting plate.

8. A defect detection device for plastic furniture production according to claim 3, characterized in that: Two L-shaped support plates are installed on the bottom outer side of the guide plate, and the top of the L-shaped support plates is in contact with the bottom of the mounting plate.

9. A defect detection device for plastic furniture production according to claim 3, characterized in that: Two guide plates are installed on the outer side of the pusher block, and the distance between the two guide plates is greater than the outer diameter of the pusher ball.

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