Laser detection device for plastic pipe fitting

Abstract

The invention discloses a laser detection device for a plastic pipe fitting, relates to the technical field of laser detection, and aims to solve the technical problems that the current detection process is complicated, the coverage is incomplete and a blind area exists, the laser detection device comprises a detection table, and a pushing mechanism, a detection mechanism, a supporting mechanism and a guide mechanism which are arranged on the detection table, the pushing mechanism comprises a moving unit and a pushing ring, the detecting mechanism comprises a second mounting plate slidably mounted on the pushing ring, the guiding mechanism comprises a guiding rod used for guiding the path of the detecting mechanism, and the supporting mechanism comprises a fixing plate and a supporting rod arranged at the side end of the fixing plate and used for supporting a plastic pipe fitting. An inner clamping plate is adjustably arranged on the outer surface of the supporting rod. The device has the advantages that the pipe fittings do not need to be overturned manually or by additional equipment, the detection process is simplified, comprehensive covering detection of the outer surfaces of the plastic pipe fittings is achieved, blind areas are eliminated, the device is suitable for pipe fittings with different diameters and various specifications, and it is guaranteed that the detection distance is stable and data are accurate.

Description

Technical Field

[0001] This invention relates to the field of laser inspection technology, and more specifically, to a laser inspection device for plastic pipe fittings. Background Technology

[0002] Laser measuring instruments are high-precision testing devices developed based on laser optics principles. They are used in the inspection of plastic pipe fittings, leveraging non-contact laser measurement technology to become a core tool for quality control. This instrument targets various plastic pipe fittings such as PPR, PE, and PVC. Its core advantage lies in its non-contact measurement mode, avoiding scratches and damage to the pipe surface. Equipped with an intelligent data processing system, the instrument can display measurement results in real time, automatically generate inspection reports, and support data storage and traceability, meeting the quality control needs of modern production.

[0003] To ensure the quality of plastic pipe fittings, laser measuring instruments are required for inspection. Currently, when inspecting the outer surface of plastic pipe fittings, the laser measuring instrument is moved along the surface of the fitting for inspection. However, manual inspection or additional equipment is needed to flip the fitting to inspect other areas of the outer surface. This method not only increases the complexity of the inspection process but also easily introduces blind spots, resulting in incomplete inspection coverage and affecting the effectiveness of quality control. Therefore, we propose a laser inspection device for plastic pipe fittings. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art, adapt to practical needs, and provide a laser inspection device for plastic pipe fittings to solve the technical problems of complex current inspection processes, incomplete coverage, and blind spots.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a laser inspection device for plastic pipe fittings, comprising an inspection table and a pushing mechanism, an inspection mechanism, a support mechanism, and a guiding mechanism disposed on the inspection table. The pushing mechanism includes a moving unit and a pushing ring. The inspection mechanism includes a second mounting plate slidably mounted on the pushing ring. A U-shaped third mounting plate is rotatably mounted on the bottom surface of the second mounting plate. A laser inspection instrument body is elastically and telescopically mounted on the bottom surface of the third mounting plate. The guiding mechanism includes a guide rod for guiding the path of the inspection mechanism. The support mechanism includes a fixed plate and a support rod disposed on the side end of the fixed plate for supporting the plastic pipe fitting. An inner clamping plate is adjustablely disposed on the outer surface of the support rod.

[0006] Preferably, the moving unit includes first mounting plates symmetrically arranged on the bottom surface of the testing platform, with threaded rods rotatably mounted between the first mounting plates. One of the first mounting plates is provided with a motor that drives the threaded rod. A moving block is threaded onto the threaded rod, and a limit block is provided on the moving block. The testing platform has an opening, and the limit block is located inside the opening. The pushing ring is provided on the top surface of the limit block.

[0007] Preferably, the inner ring of the push ring is provided with a limiting groove, the second mounting plate is provided with a limiting slider, the limiting slider is slidably disposed in the limiting groove, and a first ball is provided on the limiting slider, the first ball being in contact with the inner wall of the limiting groove.

[0008] Preferably, a first telescopic rod is symmetrically and rotatably mounted on the bottom surface of the third mounting plate. The first telescopic rod includes a sleeve rod and an inner rod inside the sleeve rod. A spring is provided inside the sleeve rod and connected to the inner rod. A second ball bearing is provided at the end of the first telescopic rod.

[0009] Preferably, a fixing frame is provided between the first telescopic rods, the laser detector body is fixed on the fixing frame, a second telescopic rod is rotatably installed on the fixing frame, a positioning ring is provided at the end of the second telescopic rod, and the positioning ring is sleeved on the guide rod.

[0010] Preferably, both ends of the guide rod are provided with fixing rods, the fixing rods are L-shaped, and the end of the fixing rod is provided with a fourth mounting plate, which is fixedly connected to the testing table by bolts.

[0011] Preferably, the guide rod includes a plurality of annular portions and a connecting portion disposed between the plurality of annular portions. The annular portions are arranged in a spiral shape. The connecting portion is arc-shaped when viewed from the side. The connecting portion is U-shaped along the long axis. The connection between the connecting portion and the annular portion is smoothly transitioned. The guide rod is also provided with a guide groove (5033) along the path of the guide rod. The guide groove is arranged in a spiral linear manner. The inner ring of the positioning ring is provided with a positioning rod. The positioning rod is located in the guide groove.

[0012] Preferably, the support rod has equidistant mounting cavities, and a connecting hole is formed between the mounting cavities. An adjusting rod is rotatably mounted in each mounting cavity. The outer surface of the adjusting rod is threaded. A knob for driving the adjusting rod is provided at the end of the support rod. An extrusion member is threaded onto the adjusting rod. The extrusion member is conical. An array of movable holes is formed on the outer surface of the support rod at the mounting cavity position. A mounting rod is disposed in each movable hole. An inner clamping plate is installed at the end of the mounting rod. A spherical member is provided at the beginning of the mounting rod. The spherical member is larger than the diameter of the movable hole and contacts the outer surface of the extrusion member.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] 1. This invention designs a guide rod and positioning ring cooperation structure. The annular part of the guide rod allows the detection mechanism to perform annular motion. Through the U-shaped and side-view arc-shaped connecting part, the detection mechanism makes reciprocating annular motion along the outer surface of the plastic pipe fitting. There is no need for manual or additional equipment to flip the pipe fitting, which simplifies the detection process, reduces operation steps, and achieves full-area coverage detection of the outer surface of the pipe fitting. It eliminates the blind spot problem of traditional detection and improves the comprehensiveness of detection. Secondly, the several annular parts are connected by the connecting part, so that the annular parts do not form a closed loop. When the detection mechanism moves in annular motion, it presents a reciprocating annular motion mode, which allows the detection mechanism to switch paths smoothly during the reciprocating annular motion. This can avoid the circuit of the laser detector body from getting wrapped around the guide rod, ensure the stability of the detection mechanism's movement, and solve the technical problems of complex detection processes and incomplete coverage with blind spots in the current detection process.

[0015] 2. This invention utilizes a guide groove and positioning rod structure. The guide groove is spirally arranged along the path of the guide rod, gradually moving from the left to the right from the beginning to the end of the annular section. During the movement of the detection mechanism, the positioning rod and guide groove work together to limit the movement, causing the detection mechanism to rotate left and right from the position of the first telescopic rod. When it is at the front of the annular section, the laser detector body faces to the right; when it is at the middle of the annular section, the laser detector body faces downward; and when it is at the tail of the annular section, the laser detector body faces to the left. This not only increases the detection range of the laser detector body but also compensates for the distance between the annular sections, enabling multi-angle detection and effectively improving the detection coverage.

[0016] 3. The present invention also designs an elastic telescopic first telescopic rod and second ball joint combination structure. The first telescopic rod is supported and extended by a spring. The elastic force of the spring can keep the first telescopic rod in an extended state, so that the second ball joint is always in close contact with the outer surface of the plastic pipe. Due to the elastic installation of the spring, it can automatically adapt to pipes of different diameters. At the same time, it accurately limits the detection distance between the laser detector body and the surface of the pipe, avoiding distance fluctuations from affecting the measurement accuracy, and further ensuring the accuracy and stability of the detection data.

[0017] 4. The present invention also features an adjustable inner clamping plate support structure. By rotating the knob, the conical extruder can be driven to push the array of inner clamping plates outward, achieving centering and fixing from inside the pipe. This ensures that the pipe axis is aligned with the movement axis of the detection mechanism, preventing pipe offset or shaking during the detection process and further improving the reliability of the detection results. At the same time, it adapts to the fixing requirements of various specifications of plastic pipes, enhancing the versatility of the device.

[0018] 5. The present invention also designs a sliding fit structure between the push ring and the limiting slider. The push ring can drive the detection mechanism to move along the long axis of the plastic tube. With the help of the guide rod, the detection mechanism can make synchronous circular motion in the inner ring of the push ring. Combined with the first ball, the friction force of the motion is effectively reduced, which not only ensures the smoothness of the movement of the detection mechanism, but also reduces the mechanical wear during the detection process, extends the service life of the device and improves the operational stability. Attached Figure Description

[0019] Figure 1 This is a front view structural diagram of the present invention;

[0020] Figure 2 This is a bottom-view structural diagram of the present invention;

[0021] Figure 3 This is a schematic diagram of the guiding mechanism structure of the present invention;

[0022] Figure 4 This is a schematic diagram of the actuation mechanism of the present invention;

[0023] Figure 5 This is a cross-sectional view of the actuation mechanism of the present invention;

[0024] Figure 6 This is a schematic diagram of the detection mechanism structure of the present invention;

[0025] Figure 7 This is a schematic diagram of the support mechanism structure of the present invention;

[0026] Figure 8 This is a cross-sectional view of the support mechanism of the present invention;

[0027] Figure 9 This is a schematic cross-sectional view of a portion of the support mechanism of the present invention;

[0028] Figure 10 This is a schematic diagram of one usage state of the present invention;

[0029] Figure 11 This is a schematic diagram illustrating another usage state of the present invention;

[0030] Figure 12 This is a schematic diagram of the positioning ring structure and guide rod cross-section structure of the present invention.

[0031] Explanation of the numbers in the diagram: 101, Testing table; 102, Movable opening; 200, Pushing mechanism; 201, First mounting plate; 202, Threaded rod; 203, Motor; 204, Moving block; 205, Limiting block; 206, Pushing ring; 2061, Limiting groove; 300, Testing mechanism; 301, Limiting slider; 302, First ball bearing; 303, Second mounting plate; 304, Third mounting plate; 305, First telescopic rod; 3051, Sleeve rod; 3052, Inner rod; 3053, Spring; 306, First... 307. Two ball bearings; 308. Fixed frame; 309. Second telescopic rod; 309. Positioning ring; 3091. Positioning rod; 310. Laser detector body; 400. Support mechanism; 401. Fixed plate; 402. Support rod; 403. Knob; 404. Adjusting rod; 405. Extrusion part; 406. Mounting rod; 407. Inner clamping plate; 500. Guide mechanism; 501. Fourth mounting plate; 502. Fixed rod; 503. Guide rod; 5031. Annular part; 5032. Connecting part; 5033. Guide groove. Detailed Implementation

[0032] like Figures 1 to 11 As shown, the present invention relates to a laser inspection device for plastic pipe fittings, comprising an inspection platform 101 and a pushing mechanism 200, an inspection mechanism 300, a support mechanism 400, and a guiding mechanism 500 disposed on the inspection platform 101. The pushing mechanism 200 includes a moving unit and a pushing ring 206. The inspection mechanism 300 includes a second mounting plate 303 slidably mounted on the pushing ring 206. A U-shaped third mounting plate 304 is rotatably mounted on the bottom surface of the second mounting plate 303. A laser inspection instrument body 310 is elastically and telescopically mounted on the bottom surface of the third mounting plate 304. The guiding mechanism 500 includes a guide rod 503 for guiding the path of the inspection mechanism 300. The support mechanism 400 includes a fixing plate 401 and a support rod 402 for supporting plastic pipe fittings disposed on the side end of the fixing plate 401. An inner clamping plate 407 is adjustablely disposed on the outer surface of the support rod 402. This invention relies on the cooperation of the guide rod 503 and the detection mechanism 300 to eliminate the need for manual or additional equipment to flip the pipe fittings, simplifying the detection process. At the same time, it achieves full coverage detection of the outer surface of the plastic pipe fittings, eliminating blind spots. Secondly, thanks to the elastic telescopic structure of the first telescopic rod 305, it can adapt to pipe fittings of different diameters, ensuring a stable detection distance between the laser detector body 310 and the pipe fitting surface. Furthermore, with the support structure of the adjustable inner clamp 407 on the support rod 402, it can adapt to various specifications of pipe fittings, ensuring accurate detection data and improving the stability and versatility of the device operation.

[0033] Specifically, the moving unit includes first mounting plates 201 symmetrically arranged on the bottom surface of the testing table 101. Threaded rods 202 are rotatably mounted between the first mounting plates 201. A motor 203 driving the threaded rods 202 is mounted on one of the first mounting plates 201. A moving block 204 is threaded onto the threaded rods 202, and a limit block 205 is provided on the moving block 204. A movable opening 102 is provided on the testing table 101, and the limit block 205 is located within the movable opening 102. A push ring 206 is located on the top surface of the limit block 205. The operation of the motor 203 causes the threaded rods 202 to rotate. Clockwise or counterclockwise rotation of the threaded rods 202 causes the moving block 204 to move left or right along the threaded rods 202, thereby moving the push ring 206. During movement, the position is limited by the limit block 205 and the movable opening 102, ensuring the stability of the movement.

[0034] It is worth noting that the inner ring of the push ring 206 is provided with a limiting groove 2061, and the second mounting plate 303 is provided with a limiting slider 301. The limiting slider 301 is slidably disposed within the limiting groove 2061, and a first ball bearing 302 is provided on the limiting slider 301, which contacts the inner wall of the limiting groove 2061. When the push ring 206 moves, because the detection mechanism 300 is limited by the guide rod 503, and the annular portion 5031 of the guide rod 503 is spirally arranged, making the guide rod 503 obliquely arranged, the movement of the push ring 206 can push the detection mechanism 300 to reciprocate in a circular motion. The limiting slider 301 can slide within the limiting groove 2061. Under the action of the first ball bearing 302, the friction of the limiting slider 301 in the limiting groove 2061 can be reduced, ensuring the stability of the sliding.

[0035] It is worth mentioning that a first telescopic rod 305 is symmetrically and rotatably mounted on the bottom surface of the third mounting plate 304. The first telescopic rod 305 includes a sleeve rod 3051 and an inner rod 3052 within the sleeve rod 3051. A spring 3053 is installed inside the sleeve rod 3051 and connected to the inner rod 3052. A second ball bearing 306 is provided at the end of the first telescopic rod 305. During inspection, the plastic pipe fitting is sleeved on the support rod 402. Because the first telescopic rod 305 is telescopic, and through the reaction force of the spring 3053, the second ball bearing 306 can contact the outer surface of the plastic pipe fitting. This limits the distance between the laser detector body 310 and the outer surface of the plastic pipe fitting, maintaining a suitable distance for laser inspection and thus ensuring the accuracy of the inspection.

[0036] It is worth noting that a fixing frame 307 is provided between the first telescopic rods 305, and the laser detector body 310 is fixed on the fixing frame 307. A second telescopic rod 308 is rotatably mounted on the fixing frame 307, and a positioning ring 309 is provided at the end of the second telescopic rod 308. The positioning ring 309 is sleeved on the guide rod 503. The rotatably mounted positioning ring 309 is always located on the guide rod 503. The positioning ring 309 can limit the position of the detection mechanism 300 and ensure the guiding effect of the guide rod 503 on it.

[0037] Furthermore, both ends of the guide rod 503 are provided with fixing rods 502, which are L-shaped. A fourth mounting plate 501 is provided at the end of each fixing rod 502, and the fourth mounting plate 501 is fixedly connected to the testing table 101 by bolts. The fourth mounting plate 501 and the fixing rods 502 are used for the installation of the guide rod 503.

[0038] Furthermore, the guide rod 503 includes a plurality of annular portions 5031 and a connecting portion 5032 disposed between the plurality of annular portions 5031. The annular portions 5031 are arranged in a spiral shape, and the connecting portion 5032 is arc-shaped from a side view. The connecting portion 5032 is arranged in a U-shape along the long axis direction. The connection between the connecting portion 5032 and the annular portions 5031 is smoothly transitioned. The guide rod 503 is also provided with a guide groove 5033 along the path of the guide rod 503. The guide groove 5033 is arranged in a spiral linear manner. The inner ring of the positioning ring 309 is provided with a positioning rod 3091, which is located in the guide groove 5033. The guide rod 503, in conjunction with the positioning ring 309, allows the detection mechanism 300 to move along the guide rod 503. The annular portion 5031 is spiral-shaped, and several annular portions 5031 are connected by connecting portions 5032, preventing the annular portions 5031 from forming a closed loop. During the annular motion, the detection mechanism 300 exhibits a reciprocating annular motion, which not only allows the laser detector body 310 to comprehensively measure and inspect the plastic pipe fittings but also prevents the wiring of the laser detector body 310 from winding around the guide rod 503, ensuring the stability of the detection mechanism 300's movement. Furthermore, the positioning ring 309 also provides guidance and limitation through the positioning rod 3091 and the guide groove 5033. The guide groove 5033, from the beginning to the end of the annular portion 5031, gradually moves from left to right. Under the guidance and limitation, the detection mechanism 300 rotates left and right from the position of the first telescopic rod 305. When it is at the front position of the annular portion 5031, such as... Figure 3As indicated by the arrow, the laser detector body 310 faces to the right. When it is located in the middle of the annular portion 5031, the laser detector body 310 faces downward. When it is located at the tail of the annular portion 5031, the laser detector body 310 faces to the left. This not only increases the detection range of the laser detector body 310, but also compensates for the distance between the annular portions 5031, enabling multi-angle detection.

[0039] Furthermore, the support rod 402 has equidistant mounting cavities, and connecting holes are provided between the mounting cavities. An adjusting rod 404 is rotatably mounted in the mounting cavity. The outer surface of the adjusting rod 404 is threaded. A knob 403 for driving the adjusting rod 404 is provided at the end of the support rod 402. An extrusion member 405 is threaded on the adjusting rod 404. The extrusion member 405 is tapered. Movable holes are arrayed on the outer surface of the support rod 402 at the mounting cavity position. A mounting rod 406 is provided in the movable hole. An inner clamping plate 407 is installed at the end of the mounting rod 406. A spherical member is provided at the beginning of the mounting rod 406. The spherical member is larger than the diameter of the movable hole and contacts the outer surface of the extrusion member 405. During the measurement and testing of plastic pipe fittings, the fitting is placed on the support rod 402. Then, by rotating the knob 403, the adjusting rod 404 is rotated, which moves the extrusion piece 405 forward. At this time, the extrusion piece 405 can extrude the spherical pieces at the beginning of several mounting rods 406, thereby causing the array of inner clamping plates 407 to move outward. The inner clamping plates 407 can support the inner wall of the plastic pipe fitting, ensuring that the axis of the plastic pipe fitting is consistent with the axis of movement of the testing mechanism 300, thus ensuring the stability and accuracy of the test.

[0040] Working Principle: This embodiment provides a laser inspection device for plastic pipe fittings. In use, the plastic pipe fitting to be inspected is first placed on the outer surface of the support rod 402 of the support mechanism 400. Then, the knob 403 is rotated to drive the adjusting rod 404 to rotate. Because the outer surface of the adjusting rod 404 is threaded and threadedly connected to the extruder 405, the rotation of the adjusting rod 404 will cause the conical extruder 405 to move forward along the mounting cavity. During the movement of the extruder 405, it extrudes the spherical part at the beginning of the mounting rod 406, causing the arrayed mounting rods 406 to extend outward along the movable hole, thereby pushing the inner clamping plate 407 to tightly adhere to the inner wall of the plastic pipe fitting, achieving centering of the plastic pipe fitting. The plastic pipe fitting is fixed to ensure that its axis is aligned with the movement axis of the testing mechanism 300. Then, the motor 203 in the push mechanism 200 is activated. The motor 203 drives the threaded rod 202 to rotate between the first mounting plates 201. The rotation of the threaded rod 202 causes the threaded connecting moving block 204 to move axially along the threaded rod 202. The moving block 204, through the limiting block 205, drives the push ring 206 to move smoothly along the movable opening 102 of the testing table 101. When the push ring 206 moves, it can push the testing mechanism 300 to move synchronously. The testing mechanism 300 is limited by the positioning ring 309 sleeved on the guide rod 503. The annular portion 5 of the guide rod 503... The 031 is spiral-shaped, and the connecting part 5032 is arc-shaped in side view and U-shaped along its long axis. This allows the detection mechanism 300 to perform circular motion along the push ring 206. The second mounting plate 303 slides in the limiting groove 2061 of the push ring 206 via the limiting slider 301. The first ball 302 reduces the sliding friction. When the positioning ring 309 enters the connecting part 5032 of the guide rod 503, the third mounting plate 304 rotates relative to the second mounting plate 303 to transition, thereby entering another annular part 5031 of the guide rod 503. This causes the detection mechanism 300 to reciprocate along the spiral annular path of the guide rod 503 and the path of the connecting part 5032. During the motion, the first telescopic rod 305 at the bottom of the third mounting plate 304 pushes the inner rod 3052 through the elastic force of the spring 3053, so that the second ball 306 is always in close contact with the outer surface of the plastic pipe, thereby limiting the detection distance between the laser detector body 310 and the outer surface of the plastic pipe. The laser detector body 310 moves along the long axis of the plastic pipe with the reciprocating circular motion of the detection mechanism 300, and performs a comprehensive scan detection on the outer surface of the plastic pipe. There is no need for manual or additional equipment to flip the pipe, avoiding blind spots in the detection. At the same time, the detection data is transmitted to the intelligent data processing system in real time to complete the generation of the detection report and data storage traceability.

[0041] The embodiments disclosed in this invention are preferred embodiments, but are not limited thereto. Those skilled in the art can easily understand the spirit of this invention based on the above embodiments and make different extensions and variations, but as long as they do not depart from the spirit of this invention, they are all within the protection scope of this invention.

Claims

1. A laser inspection device for plastic pipe fittings, characterized in that, The device includes a testing platform (101) and a pushing mechanism (200), a testing mechanism (300), a support mechanism (400), and a guiding mechanism (500) provided on the testing platform (101). The pushing mechanism (200) includes a moving unit and a pushing ring (206). The testing mechanism (300) includes a second mounting plate (303) slidably mounted on the pushing ring (206). A U-shaped third mounting plate (304) is rotatably mounted on the bottom surface of the second mounting plate (303). A laser detector body (310) is elastically telescopically mounted on the bottom surface of the third mounting plate (304). The guiding mechanism (500) includes a guide rod (503) for guiding the path of the testing mechanism (300). The support mechanism (400) includes a fixed plate (401) and a support rod (402) for supporting plastic pipe fittings provided on the side end of the fixed plate (401). An inner clamping plate (407) is adjustablely provided on the outer surface of the support rod (402).

2. The laser inspection device for plastic pipe fittings according to claim 1, characterized in that, The moving unit includes first mounting plates (201) symmetrically arranged on the bottom surface of the testing table (101). Threaded rods (202) are rotatably mounted between the first mounting plates (201). A motor (203) for driving the threaded rods (202) is provided on one of the first mounting plates (201). A moving block (204) is threaded onto the threaded rods (202). A limit block (205) is provided on the moving block (204). An opening (102) is provided on the testing table (101). The limit block (205) is located inside the opening (102). A push ring (206) is provided on the top surface of the limit block (205).

3. The laser inspection device for plastic pipe fittings according to claim 2, characterized in that, The inner ring of the push ring (206) is provided with a limiting groove (2061), and the second mounting plate (303) is provided with a limiting slider (301). The limiting slider (301) is slidably disposed in the limiting groove (2061), and the limiting slider (301) is provided with a first ball (302). The first ball (302) is in contact with the inner wall of the limiting groove (2061).

4. The laser inspection device for plastic pipe fittings according to claim 3, characterized in that, The bottom surface of the third mounting plate (304) is symmetrically and rotatably mounted with a first telescopic rod (305). The first telescopic rod (305) includes a sleeve rod (3051) and an inner rod (3052) inside the sleeve rod (3051). A spring (3053) is provided inside the sleeve rod (3051) and connected to the inner rod (3052). A second ball bearing (306) is provided at the end of the first telescopic rod (305).

5. The laser inspection device for plastic pipe fittings according to claim 4, characterized in that, A fixing frame (307) is provided between the first telescopic rods (305), and the laser detector body (310) is fixed on the fixing frame (307). A second telescopic rod (308) is rotatably installed on the fixing frame (307). A positioning ring (309) is provided at the end of the second telescopic rod (308), and the positioning ring (309) is sleeved on the guide rod (503).

6. The laser inspection device for plastic pipe fittings according to claim 5, characterized in that, Both ends of the guide rod (503) are provided with fixing rods (502), the fixing rods (502) are L-shaped, and the end of the fixing rods (502) is provided with a fourth mounting plate (501), the fourth mounting plate (501) is fixedly connected to the testing table (101) by bolts.

7. The laser inspection device for plastic pipe fittings according to claim 6, characterized in that, The guide rod (503) includes several annular portions (5031) and connecting portions (5032) arranged between several annular portions (5031). The annular portions (5031) are arranged in a spiral shape. The connecting portions (5032) are arc-shaped from a side view. The connecting portions (5032) are arranged in a U-shape along the long axis. The connection between the connecting portions (5032) and the annular portions (5031) is smoothly transitioned. The guide rod (503) is also provided with a guide groove (5033) along the path of the guide rod (503). The guide groove (5033) is arranged in a spiral linear manner. The inner ring of the positioning ring (309) is provided with a positioning rod (3091). The positioning rod (3091) is located in the guide groove (5033).

8. The laser inspection device for plastic pipe fittings according to claim 7, characterized in that, The support rod (402) has equidistant mounting cavities, and a connecting hole is provided between the mounting cavities. An adjusting rod (404) is rotatably mounted in the mounting cavity. The outer surface of the adjusting rod (404) is provided with a thread. The end of the support rod (402) is provided with a knob (403) for driving the adjusting rod (404). An extrusion member (405) is threaded on the adjusting rod (404). The extrusion member (405) is tapered. The outer surface of the support rod (402) is provided with an array of movable holes at the mounting cavity position. An mounting rod (406) is provided in the movable hole. The inner clamping plate (407) is installed at the end of the mounting rod (406). The beginning of the mounting rod (406) is provided with a spherical member. The spherical member is larger than the diameter of the movable hole and contacts the outer surface of the extrusion member (405).

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