Straight pipe endoscopic detection device and use method

Abstract

The invention relates to the technical field of nondestructive testing, in particular to a straight pipe endoscopic detection device and a using method, and solves the problems of lack of lens protection and low feeding and discharging efficiency in the prior art. The straight pipe endoscopic detection device comprises a rack, a control assembly and a deployment mechanism are arranged on the rack, and the control assembly is connected with a detection lens through a wire; the deployment mechanism is used for conveying the detection lens into a workpiece for detection, the deployment mechanism is provided with a lens inlet, the detection lens is provided with a first lens protection head and a second lens protection head, the first lens protection head and the second lens protection head are each of a hollow structure, and the detection lens is arranged in the hollow structures in a penetrating mode; the first lens protection head and the second lens protection head are in threaded connection, and a lens locking ring for limiting and locking the detection lens is arranged between the first lens protection head and the second lens protection head. The beneficial effects are that the protection performance of the detection lens is substantially improved, and the use and maintenance cost is reduced; and automatic feeding, discharging and sorting are achieved, and the high-beat production requirement is met.

Description

Technical Field

[0001] This invention relates to the field of nondestructive testing technology, and in particular to a straight tube endoscopic testing device and its usage method. Background Technology

[0002] Straight pipes, as key components for transmitting working fluids and supporting structures, are widely used in aerospace, hydraulic, petroleum, shipbuilding, and other industrial fields. The quality of their inner walls directly determines the safety and reliability of the entire system. If there are defects such as foreign matter, pits, protrusions, or scratches on the inner wall of a straight pipe, it can easily lead to fluid leakage; it can also easily cause foreign matter to accumulate inside the system, resulting in the failure and damage of internal precision components. This not only causes huge economic losses but may also endanger the lives of operators. Therefore, accurate and efficient detection of defects in the inner wall of straight pipes has significant industrial value and social significance.

[0003] For the detection of defects in the inner wall of straight pipes, existing technologies mainly include four mainstream solutions: magnetic flux leakage detection, X-ray detection, ultrasonic detection, and computer vision detection. Among them, while magnetic flux leakage detection, X-ray detection, and ultrasonic detection can detect macroscopic defects inside pipelines, they are limited by their detection principles and cannot effectively identify microscopic defects (such as minor scratches and local protrusions) on the surface of the inner wall of straight pipes. Furthermore, these methods are difficult to integrate deeply with automated control systems, requiring a large amount of manual intervention in the detection process, resulting in low detection efficiency and high reliability of results due to human factors.

[0004] To address the aforementioned issues, existing technologies have developed automated inspection solutions based on computer vision and machine learning. For example, patent CN112845159A discloses a pipeline visual inspection system comprising a transmission mechanism, a feeding mechanism, a lifting mechanism, a deployment mechanism, inspection equipment, and control equipment. This system achieves horizontal transport of the pipeline through the transmission and feeding mechanisms, positions and fixes the pipeline using the lifting and clamping mechanisms, and delivers an endoscope assembly into the pipeline via the deployment mechanism. Then, an intelligent pipe inspection instrument intelligently classifies the inner wall image based on support vector machines and convolutional neural networks. Finally, a sorting mechanism sorts the pipeline into qualified or unqualified storage bins. This solution effectively achieves semi-automated feeding, fully automated equipment deployment, and intelligent classification for pipeline inner wall inspection, significantly improving inspection efficiency and recognition reliability, and providing important technical reference for the inspection of the inner walls of rigid metal pipes.

[0005] However, in actual industrial applications, the aforementioned existing patented technologies still have the following technical defects that urgently need to be addressed: The endoscope lacks a protective mechanism and has high operating costs: the deployment mechanism of this patent only uses rollers to drive the endoscope assembly into the tubing. Existing endoscopes only have a rigid front section; the subsequent guide wires are flexible. When the endoscope is pushed forward into the tubing, the insufficient rigidity of the guide wires causes bending and deformation, making the endoscope prone to rigid collisions with the tubing opening, leading to lens damage. Furthermore, the significant differences in the opening dimensions of straight tubing of different diameters make it difficult to ensure the coaxiality of the lens and the opening, further increasing the risk of collision. In practical applications, frequent lens damage not only requires frequent replacement of spare parts but also leads to prolonged equipment downtime, significantly increasing equipment operating and maintenance costs and severely impacting production continuity.

[0006] The loading and unloading efficiency is difficult to match the demands of high-speed production: The feeding mechanism of this patent requires manual placement of the pipes to be tested one by one. Although the tested pipes are automatically sorted by the sorting mechanism, the overall loading and unloading process still relies on manual operation, making it impossible to achieve full automation. As the pace of industrial production increases, the efficiency bottleneck of manual loading and unloading becomes increasingly apparent, making it difficult to improve the overall utilization rate of the equipment and meet the testing needs of large-scale production. Summary of the Invention

[0007] This invention proposes a straight tube endoscope detection device and its usage method, which solves the problems of lack of lens protection and low loading and unloading efficiency in the prior art.

[0008] The technical solution of this invention is implemented as follows: An endoscope for straight tube inspection includes a frame with a control component and a deployment mechanism. The control component is connected to a detection lens via a wire. The deployment mechanism is used to deliver the detection lens into the straight tube to be inspected for inspection. The deployment mechanism is equipped with a lens inlet assembly, which includes a first lens protection head and a second lens protection head mounted on the detection lens. Both the first and second lens protection heads are hollow structures, and the detection lens passes through the hollow structures. The first and second lens protection heads are threaded together, and a lens locking ring is provided between the first and second lens protection heads for limiting and locking the detection lens. The frame is also equipped with a positioning component for positioning the end of the straight tube to be inspected.

[0009] The lens locking ring has an open annular structure with tapered surfaces on both sides. The first and second lens protection heads mate with the tapered surfaces on both sides of the lens locking ring. By tightening the threaded connection between the first and second lens protection heads, the tapered surfaces compress the open annular lens locking ring, causing it to radially contract and fit tightly against the outer wall of the detection lens. This achieves stable positioning of the detection lens and prevents the lens from shifting relative to the protection heads during the detection process.

[0010] The ends of the first and second lens protection heads are provided with tapered guide surfaces. These are used to guide the protection heads smoothly into the straight pipe opening, reducing rigid collisions with burrs or end faces of the pipe opening.

[0011] The lens inlet assembly also includes a lens inlet mount with a through hole. The outer diameters of both the first and second lens protection heads are fitted with the through hole with a clearance, ensuring the coaxiality of the protection heads and the lens inlet assembly and further improving the alignment accuracy of the inspection lens. The end of the lens inlet mount has a positioning chamfer; during inspection, the chamfer assists in aligning with the end of the straight tube to be inspected, facilitating the entry of the inspection lens into the tube. The top of the lens inlet mount has an identification code, and a recognition camera connected to the control assembly is mounted on the frame. The recognition camera corresponds to the identification code, ensuring that the inspection lens matches the straight tube to be inspected.

[0012] The positioning assembly includes a positioning seat mounted on a frame, with two inclined positioning plates on the positioning seat. The two positioning plates cooperate to form a downward-facing V-shaped positioning groove, which corresponds to the through hole on the lens inlet seat. The V-shaped positioning groove positions the end of the straight tube to be inspected, so that the end of the straight tube is directly aligned with the through hole on the lens inlet seat, thereby facilitating the entry of the inspection lens into the straight tube.

[0013] The deployment mechanism also includes an upper and lower guide assembly, a left and right guide assembly, and a wire reel. The wire of the detection lens is wound on the wire reel, and the detection lens passes through the upper and lower guide assembly and the left and right guide assembly in sequence before entering the lens inlet assembly. The upper and lower guide assembly and the left and right guide assembly are used to adjust the horizontal and vertical position of the detection lens to ensure that the axis of the detection lens coincides with the through hole on the lens inlet seat.

[0014] The frame is also equipped with a transmission mechanism, a feeding mechanism, a clamping mechanism, and a distributing mechanism. The transmission mechanism, feeding mechanism, clamping mechanism, and distributing mechanism are all connected to the control components. The transmission mechanism drives the feeding mechanism to move. The feeding mechanism is used to move the straight pipe. The clamping mechanism is used to clamp the straight pipe to the detection position. The distributing mechanism corresponds to the position of the hopper on one side of the frame.

[0015] The transmission mechanism includes a drive motor and a drive shaft. The drive motor is mounted on the frame, and the drive shaft is rotatably mounted on the frame. The drive motor drives the drive shaft to rotate, and the drive shaft drives the feeding mechanism to move via a belt drive mechanism. The feeding mechanism includes a feeding shaft and a ring chain. The drive shaft drives the feeding shaft to rotate, and the feeding shaft is equipped with a sprocket. The ring chain is mounted on the sprocket and has feeding teeth with V-grooves. The V-grooves are adapted to straight pipes of different diameters, achieving automatic alignment by fitting against the outer wall of the straight pipe.

[0016] The hopper includes an upper hopper and an lower hopper, both arranged at an angle. The material sorting mechanism includes a sorting plate and a telescopic drive component. One side of the sorting plate overlaps with the feeding shaft, and the other side corresponds to the inlet position of either the upper or lower hopper. One end of the telescopic drive component is hinged to the frame, and the other end is hinged to the lower surface of the sorting plate. By extending and retracting the telescopic drive component, the overlap position of the sorting plate is switched, achieving automatic sorting of straight pipes.

[0017] A method of using the aforementioned straight-tube endoscopic detection device comprises the following steps: Step 1: The control component controls the detection device to send the straight tube to be tested to the detection position; the control component identifies the identification code on the lens inlet component through the recognition camera to determine whether the lens inlet component matches the straight tube to be tested; the control component starts the transmission mechanism, the transmission motor drives the transmission shaft to rotate, and drives the feeding shaft to rotate through the belt transmission mechanism. The sprocket on the feeding shaft drives the ring chain to move. The straight tube to be tested is located in the V-groove of the feeding teeth. The ring chain drives the straight tube to the detection position of the clamping mechanism. The clamping mechanism clamps the straight tube to the detection position. Step Two: The deployment mechanism delivers the detection lens, along with the first and second lens protection heads, into the interior of the straight pipe to be inspected. The first and second lens protection heads contact the inner wall of the pipe, and the detection lens captures an image of the inner wall surface. The deployment mechanism's coil releases the lead wire. After the detection lens's axis position is adjusted sequentially by the left and right guide components and the up and down guide components, it extends into the straight pipe along with the first and second lens protection heads through the through hole of the lens inlet seat. The tapered guide surface at the end of the first lens protection head guides the protection head smoothly into the pipe opening. The outer wall of the protection head fits and supports the inner wall of the straight pipe, and the detection lens captures an image of the inner wall surface. Step 3: The control component classifies the images captured by the inspection lens and outputs the inspection results. The control component receives the images captured by the inspection lens, classifies the images based on a preset defect recognition algorithm, determines whether the straight pipe has defects such as foreign objects, dents, scratches, etc., and outputs a qualified or unqualified inspection result; the clamping mechanism releases, and the telescopic drive extends and retracts according to the inspection results, causing the material distribution plate to switch the overlap position: if the inspection result is qualified, the material distribution plate overlaps to the inlet of the loading hopper, and the straight pipe rolls down to the loading hopper via the material distribution plate; if the inspection result is unqualified, the material distribution plate overlaps to the inlet of the unloading hopper, and the straight pipe rolls down to the unloading hopper via the material distribution plate, realizing classified collection.

[0018] The beneficial effects of this invention are: significantly improving the protective performance of the inspection lens and reducing the cost of use and maintenance: by setting a dual-lens protective head, and with the conical guide surface at the end of the protective head, the rigid collision between the inspection lens and the burrs and uneven end face of the straight pipe opening is effectively avoided; at the same time, the lens locking ring achieves radial contraction through the conical surface compression, which not only ensures a stable connection between the inspection lens and the protective head, but also avoids the risk of collision caused by lens displacement, solving the problems of easy lens damage and frequent maintenance, and greatly reducing the cost of spare parts replacement and equipment downtime.

[0019] Achieving fully automated loading, unloading, and sorting processes to meet high-cycle production demands: The inclined loading hopper utilizes gravity to automatically classify and unload straight pipes, while a ring chain feeding mechanism replaces manual conveying. The sorting mechanism automatically classifies and sorts qualified / unqualified straight pipes via telescopic drive components, forming a fully automated operation with a high detection cycle, meeting the high-cycle demands of large-scale production. This solves the bottleneck of manual loading and unloading and low efficiency in existing technologies, significantly improving the overall utilization rate of the equipment. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of a straight tube endoscope detection device according to the present invention; Figure 2 for Figure 1 Enlarged view of point A in the middle; Figure 3 This is a schematic diagram of the frame structure; Figure 4 This is a partial side view of a straight-tube endoscopic inspection device; Figure 5 This is a schematic diagram of the feeding mechanism; Figure 6 A schematic diagram of the deployment mechanism; Figure 7 Exploded view of the lens inlet component; Figure 8 A cross-sectional view of the lens protector head; Figure 9 This is a schematic diagram of the lens locking ring structure; Figure 10 This is a schematic diagram of the positioning component structure; Figure 11 This is a schematic diagram of the clamping head structure.

[0022] In the diagram: 1. Transmission mechanism, 2. Feeding mechanism, 3. Clamping mechanism, 4. Deployment mechanism, 5. Distributing mechanism, 6. Hopper, 7. Identification camera, 8. Frame, 9. Positioning component, 11. Drive motor, 12. Drive shaft, 13. First pulley, 21. Feeding tooth, 22. Second pulley, 31. Clamping head, 311. Clamping block, 312. V-groove, 41. Lens inlet component, 42. Upper and lower guide components, 43. Left and right guide components, 44. Wire reel, 411. Lens inlet seat, 412. Identification code, 413. First lens protection head, 414. Second lens protection head, 415. Lens locking ring, 51. Distributing plate, 52. Telescopic drive component, 61. Upper hopper, 62. Lower hopper, 91. Positioning seat, 92. Positioning plate, 93. Lower elongated hole, 94. Upper elongated hole. Detailed Implementation

[0023] 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.

[0024] Example 1, as Figure 1 , Figure 2 , Figure 7 , Figure 8 As shown, a straight tube endoscope inspection device includes a frame 8, on which a control component and a deployment mechanism 4 are provided. The control component is connected to an inspection lens via a wire. The deployment mechanism 4 is used to deliver the inspection lens into the straight tube to be inspected for inspection. The deployment mechanism 4 is provided with a lens inlet component 41, which includes a first lens protection head 413 and a second lens protection head 414 disposed on the inspection lens. Both the first lens protection head 413 and the second lens protection head 414 are hollow structures, and the inspection lens passes through the hollow structure. The first lens protection head 413 and the second lens protection head 414 are threadedly connected. A lens locking ring 415 for limiting and locking the inspection lens is provided between the first lens protection head 413 and the second lens protection head 414. The frame 8 is provided with a positioning component 9 for positioning the end of the straight tube to be inspected. By setting up a dual-lens protection head, and with the tapered guide surface at the end of the protection head, the detection lens is effectively prevented from directly colliding with the burrs and uneven end face of the straight pipe opening, thus effectively protecting the monitoring lens; the positioning component 9 can position the end of the straight pipe to be tested, ensuring that the detection lens can accurately enter the straight pipe to be tested.

[0025] Furthermore, such as Figure 9As shown, the lens locking ring 415 has an open annular structure, with tapered surfaces on both sides. The first lens protection head 413 and the second lens protection head 414 engage with the tapered surfaces on both sides of the lens locking ring 415. By tightening the threaded connection between the first lens protection head 413 and the second lens protection head 414, the tapered surfaces compress the open annular lens locking ring 415, causing the lens locking ring 415 to radially contract and fit tightly against the outer wall of the detection lens, thus achieving stable positioning of the detection lens and preventing the lens from shifting relative to the protection head during the detection process.

[0026] Furthermore, the ends of the first lens protection head 413 and the second lens protection head 414 are provided with tapered guide surfaces. The tapered guide surfaces are used to guide the protection heads to smoothly extend into the straight pipe opening, reducing rigid collisions with burrs or end faces of the pipe opening.

[0027] Furthermore, the lens inlet assembly 41 also includes a lens inlet seat 411, which has a through hole. The outer diameters of the first lens protection head 413 and the second lens protection head 414 are both clearance-fitted with the through hole, ensuring the coaxiality of the protection head and the lens inlet and further improving the alignment accuracy of the inspection lens. The end of the lens inlet seat 411 has a positioning chamfer; during inspection, the positioning chamfer assists in aligning with the end of the straight tube to be inspected, facilitating the entry of the inspection lens into the tube. The top of the lens inlet seat 411 has an identification code 412, and the frame 8 has an identification camera 7 connected to the control assembly. The identification camera 7 corresponds to the identification code 412, ensuring that the inspection lens matches the straight tube to be inspected.

[0028] In practical use, multiple sets of lens inlet mounts 411, first lens protection head 413 and second lens protection head 414 of different sizes can be set. Each set of lens inlet components 41 has an identification code 412 set on the lens inlet mount 411. When performing straight tube testing, different specifications of lens inlet components 41 are selected according to the size of the straight tube. Then, the specifications of the lens inlet components 41 are judged by the identification camera 7 to determine whether the size of the straight tube to be tested matches that of the lens inlet components 41, so as to avoid lens collision caused by size mismatch.

[0029] Furthermore, such as Figure 10As shown, the positioning assembly 9 includes a positioning seat 91 mounted on the frame 8. The positioning seat 91 has two inclined positioning plates 92, which cooperate to form a downward-facing V-shaped positioning groove. The V-shaped positioning groove corresponds to the through hole on the lens inlet seat 411. The V-shaped positioning groove positions the end of the straight tube to be inspected, ensuring the end of the straight tube is directly opposite the through hole on the lens inlet assembly 41, thus facilitating the entry of the inspection lens into the straight tube. Specifically, the positioning seat 91 has a lower elongated hole 93 and an upper elongated hole 94. The upper part of the positioning plate 92 is connected to the upper elongated hole 94 via connecting bolts, and the lower part of the positioning plate 92 is connected to the lower elongated hole 94 via connecting bolts. The lower elongated hole 93 and the upper elongated hole 94 are staggered. By adjusting the connection position of the positioning plate 92 in the lower elongated hole 93 and the upper elongated hole 94, i.e., changing the relative height between the positioning plate 92 and the positioning seat 91, the size of the V-shaped positioning groove can be adjusted, thus enabling the positioning assembly 9 to be suitable for inspecting straight tubes of different sizes.

[0030] Furthermore, such as Figure 6 As shown, the deployment mechanism 4 also includes an upper and lower guide assembly 42, a left and right guide assembly 43, and a wire reel 44. The wire of the detection lens is wound on the wire reel 44. The detection lens passes through the upper and lower guide assembly 42 and the left and right guide assembly 43 in sequence before entering the lens inlet assembly 41. The upper and lower guide assembly 42 and the left and right guide assembly 43 are used to adjust the horizontal and vertical position of the detection lens to ensure that the axis of the detection lens coincides with the through hole on the lens inlet seat 411. Specifically, the upper and lower guide assembly 42 includes a first bracket, on which two sets of vertical connecting seats are slidably mounted. Each of the two sets of vertical connecting seats is rotatably connected to a horizontal roller. A vertical threaded rod is threadedly connected to the first bracket, and the end of the vertical threaded rod is rotatably connected to one of the vertical connecting seats. By rotating the vertical threaded rod, the height of the vertical connecting seats on the first bracket can be adjusted, thereby adjusting the distance between the two horizontal rollers, so that the deployment mechanism can be adapted to different specifications of inspection lenses. The left and right guide assembly 43 includes a second bracket, on which two sets of horizontal connecting seats are slidably mounted. Each of the two sets of horizontal connecting seats is rotatably connected to a vertical roller. A horizontal threaded rod is threadedly connected to the second bracket, and the end of the horizontal threaded rod is rotatably connected to the two sets of horizontal connecting seats. By rotating the horizontal threaded rod, the horizontal position of the horizontal connecting seats on the second bracket can be adjusted, thereby adjusting the distance between the two vertical rollers, so that the deployment mechanism can be adapted to different specifications of inspection lenses. Both the horizontal rollers and the vertical rollers have annular grooves on their outer sides, and the wires of the inspection lens cooperate with the annular grooves.

[0031] Example 2, based on Example 1, provides a straight-tube endoscopic detection device, such as... Figure 1As shown, the frame 8 is also equipped with a transmission mechanism 1, a feeding mechanism 2, a clamping mechanism 3, and a distributing mechanism 5. All three mechanisms are connected to the control components. The transmission mechanism 1 drives the feeding mechanism 2, which in turn moves the straight pipe. The clamping mechanism 3 clamps the straight pipe to the detection position. The distributing mechanism 5 corresponds to the position of the hopper 6 on one side of the frame 8. Figure 3 As shown, the transmission mechanism 1 includes a transmission motor 11 and a transmission shaft 12. The transmission motor 11 is mounted on the frame 8, and the transmission shaft 12 is rotatably mounted on the frame 8. The transmission motor 11 drives the transmission shaft 12 to rotate, and the transmission shaft 12 drives the feeding mechanism 2 to move through a belt transmission mechanism. Specifically, the frame 8 is provided with multiple sets of feeding mechanisms 2 arranged in parallel. The transmission motor 11 drives multiple sets of feeding mechanisms 2 to move synchronously through the transmission shaft 12, so that the feeding mechanism 2 transports the straight tube to be tested.

[0032] Furthermore, such as Figure 5 As shown, the feeding mechanism 2 includes a feeding shaft and a ring chain. A drive shaft 12 drives the feeding shaft to rotate. A sprocket is mounted on the feeding shaft, and the ring chain is mounted on the sprocket. Feeding teeth 21 are provided on the ring chain, and V-grooves are provided on the feeding teeth 21. A first pulley 13 is mounted on the drive shaft 12, and a second pulley 22 is located at the end of the feeding shaft. The first pulley 13 is connected to the second pulley 22 via a belt. When the sprocket rotates, the feeding teeth 21 move with the chain, thereby transporting the straight pipe to be inspected. The V-grooves adapt to straight pipes of different diameters, achieving automatic alignment by fitting against the outer wall of the straight pipe.

[0033] Furthermore, a length measuring component is provided on the frame 8. The length measuring component includes a baffle and a measuring head. The baffle is located on one side of the feeding mechanism 2 and is arranged on the same side as the deployment mechanism 4. The measuring head is slidably mounted on the frame 8. The lower end of the measuring head is a V-shaped head, and the angle of the V-shaped head is smaller than the angle of the V-groove on the feeding tooth 21. In addition, the vertical distance from the baffle to the feeding mechanism 2 is smaller than the vertical distance from the positioning component 9 to the feeding mechanism 2. When the straight tube to be tested moves to the length measuring station, the measuring head engages with the end face of the straight tube. The movement of the measuring head pushes the straight tube toward the baffle. When both ends of the straight tube abut against the measuring head and the baffle, the length of the straight tube is determined by the control component. After the length measurement, the length of the straight tube extending out of the feeding mechanism 2 is consistent, which facilitates the subsequent clamping mechanism 3 to align the end of the straight tube with the deployment mechanism 4.

[0034] Furthermore, such as Figure 4As shown, the hopper 6 includes an upper hopper 61 and a lower hopper 62, both of which are arranged at an angle. The material sorting mechanism 5 includes a sorting plate 51 and a telescopic drive component 52. One side of the sorting plate 51 overlaps with the feeding shaft, and the other side of the sorting plate 51 corresponds to the inlet position of the upper hopper 61 or the lower hopper 62. One end of the telescopic drive component 52 is hinged to the frame 8, and the other end of the telescopic drive component 52 is hinged to the lower surface of the sorting plate 51. The overlapping position of the sorting plate is switched by the telescopic movement of the telescopic drive component, thereby realizing the automatic sorting of straight pipes.

[0035] In addition, in this embodiment, the clamping mechanism 3 includes a lateral moving component for moving the straight pipe to be tested along its axis and a lifting component for moving the straight pipe to be tested up and down. The lifting component is provided with three clamping heads arranged side by side, each clamping head is provided with a clamping block, and the clamping block is provided with V-shaped grooves of different sizes. Depending on the diameter of the straight pipe to be tested, when the clamping head clamps the straight pipe to be tested, the straight pipe to be tested is aligned with the corresponding size V-shaped groove, thereby expanding the applicable range of the clamping head and improving the applicability of the clamping mechanism 3. Furthermore, when clamping and lifting the pipe to be tested, the three clamping heads clamp the straight pipe to be tested simultaneously, effectively reducing the bending of the straight pipe due to its own weight.

[0036] Example 3, based on Example 2, provides a method for using the aforementioned straight-tube endoscopic detection device, comprising the following steps: Step 1: The control component controls the detection device to deliver the straight tube to be tested to the detection position; the control component identifies the identification code 412 on the lens inlet component 41 through the recognition camera 7, and determines whether the lens inlet component 41 matches the straight tube to be tested; the control component starts the transmission mechanism 1, the transmission motor 11 drives the transmission shaft 12 to rotate, and drives the feeding shaft to rotate through the belt transmission mechanism. The sprocket on the feeding shaft drives the ring chain to move. The straight tube to be tested is located in the V-groove of the feeding teeth. The ring chain drives the straight tube to move to the clamping position of the clamping mechanism 3. The clamping mechanism 3 clamps and lifts the straight tube, aligning it with the position of the machine head inlet assembly 41. Specifically, the clamping mechanism 3 is driven by a servo motor. During testing, the diameter of the straight tube to be tested is input into the control assembly. After calculation by the control assembly, the control assembly drives the clamping mechanism 3 to clamp the straight tube to be tested to the testing position, aligning the end of the straight tube to be tested with the positioning chamfer position. The positioning chamfer assists in aligning the end of the straight tube to be tested, facilitating the entry of the testing lens into the straight tube.

[0037] Step 2: Deployment mechanism 4 delivers the detection lens, along with the first lens protection head 413 and the second lens protection head 414, into the interior of the straight tube to be tested. The first lens protection head 413 and the second lens protection head 414 contact the inner wall of the tube to be tested, and the detection lens captures an image of the inner wall surface of the tube. The coil 44 of deployment mechanism 4 releases the wire. After the detection lens is adjusted in the axial position by the left and right guide components 43 and the up and down guide components 42, it extends into the interior of the straight tube to be tested along with the first lens protection head 413 and the second lens protection head 414 through the through hole of the lens inlet seat 411. The tapered guide surface at the end of the first lens protection head 413 guides the protection head to smoothly enter the tube opening. The outer wall of the protection head fits and supports the inner wall of the straight tube, and the detection lens captures an image of the inner wall surface of the straight tube. Step 3: The control component classifies the images captured by the inspection lens and outputs the inspection results. The control component receives the images captured by the inspection lens, classifies the images based on a preset defect recognition algorithm, determines whether the straight pipe has defects such as foreign objects, dents, scratches, etc., and outputs a qualified or unqualified inspection result. The clamping mechanism places the inspected straight pipe back onto the feeding mechanism 2. The feeding mechanism 2 drives the inspected straight pipe to continue moving forward. The telescopic drive 52 extends and retracts according to the inspection results, causing the material distribution plate 51 to switch the overlap position: if the inspection result is qualified, the material distribution plate 51 overlaps with the inlet of the loading bin 61, and the straight pipe rolls down into the loading bin 61 through the material distribution plate 51; if the inspection result is unqualified, the material distribution plate 51 overlaps with the inlet of the unloading bin 62, and the straight pipe rolls down into the unloading bin 62 through the material distribution plate 51, realizing classified collection.

[0038] Example 4 differs from Example 3 in that, in a method of using the straight tube endoscopic inspection device, before the feeding mechanism 2 transports the straight tube to be inspected to the inspection station, the straight tube to be inspected passes through the length measuring component; when the clamping mechanism 3 clamps the straight tube to be inspected at the inspection station for endoscopic inspection, the feeding mechanism 2 stops moving, and at this time the length measuring component performs length inspection on the straight tube to be inspected at the station.

[0039] The above description is only a preferred embodiment of the present invention and is 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. A straight-tube endoscopic detection device, comprising a frame (8), characterized in that, The frame (8) is provided with a control component and a deployment mechanism (4). The control component is connected to a detection lens via a wire. The deployment mechanism (4) is used to send the detection lens into the straight tube to be detected for detection. The deployment mechanism (4) is provided with a lens inlet component (41). The lens inlet component (41) includes a first lens protection head (413) and a second lens protection head (414) set on the detection lens. The first lens protection head (413) and the second lens protection head (414) are both hollow structures. The detection lens passes through the hollow structure. The first lens protection head (413) and the second lens protection head (414) are threaded together. A lens locking ring (415) for limiting and locking the detection lens is provided between the first lens protection head (413) and the second lens protection head (414). The frame (8) is provided with a positioning component (9) for positioning the end of the straight tube to be detected.

2. The straight-tube endoscopic detection device according to claim 1, characterized in that, The lens locking ring (415) is an open ring structure. Conical surfaces are provided on both sides of the lens locking ring (415). The first lens protection head (413) and the second lens protection head (414) cooperate with the conical surfaces on both sides of the lens locking ring (415).

3. The straight-tube endoscopic detection device according to claim 2, characterized in that, The ends of the first lens protection head (413) and the second lens protection head (414) are provided with tapered guide surfaces.

4. The straight-tube endoscopic detection device according to claim 3, characterized in that, The lens inlet assembly (41) also includes a lens inlet seat (411), which has a through hole. The outer diameters of the first lens protection head (413) and the second lens protection head (414) are both fitted with the through hole with clearance. The end of the lens inlet seat (411) has a positioning chamfer. The top of the lens inlet seat (411) has an identification code (412). The frame (8) has an identification camera (7) connected to the control assembly. The identification camera (7) corresponds to the identification code (412).

5. The straight-tube endoscopic detection device according to claim 4, characterized in that, The positioning component (9) includes a positioning seat (91) set on the frame (8). The positioning seat (91) is provided with two inclined positioning plates (92). The two positioning plates (92) cooperate to form a V-shaped positioning groove with the opening facing downward. The V-shaped positioning groove corresponds to the position of the through hole on the lens inlet seat (411).

6. The straight-tube endoscopic detection device according to claim 5, characterized in that, The deployment mechanism (4) also includes an upper and lower guide assembly (42), a left and right guide assembly (43) and a wire reel (44). The wire of the detection lens is wound on the wire reel (44). The detection lens passes through the upper and lower guide assembly (42) and the left and right guide assembly (43) in sequence and then enters the lens inlet assembly (41).

7. The straight-tube endoscopic detection device according to any one of claims 1 to 6, characterized in that, The frame (8) is also equipped with a transmission mechanism (1), a feeding mechanism (2), a clamping mechanism (3) and a distributing mechanism (5). The transmission mechanism (1), the feeding mechanism (2), the clamping mechanism (3) and the distributing mechanism (5) are all connected to the control components. The transmission mechanism (1) drives the feeding mechanism (2) to move. The feeding mechanism (2) is used to drive the straight pipe to move. The clamping mechanism (3) is used to clamp the straight pipe to the detection position. The distributing mechanism (5) corresponds to the position of the hopper (6) on one side of the frame (8).

8. The straight-tube endoscopic detection device according to claim 7, characterized in that, The transmission mechanism (1) includes a transmission motor (11) and a transmission shaft (12). The transmission motor (11) is mounted on the frame (8), and the transmission shaft (12) is rotatably mounted on the frame (8). The transmission motor (11) drives the transmission shaft (12) to rotate, and the transmission shaft (12) drives the feeding mechanism (2) to move through the belt transmission mechanism. The feeding mechanism (2) includes a feeding shaft and an annular chain. The transmission shaft (12) drives the feeding shaft to rotate. The feeding shaft is equipped with a sprocket, and the annular chain is mounted on the sprocket. The annular chain is equipped with feeding teeth (21), and the feeding teeth (21) are equipped with V-grooves.

9. The straight-tube endoscopic detection device according to claim 8, characterized in that, The hopper (6) includes an upper hopper (61) and a lower hopper (62), both of which are arranged at an incline. The material distribution mechanism (5) includes a material distribution plate (51) and a telescopic drive (52). One side of the material distribution plate (51) is connected to the feeding shaft, and the other side of the material distribution plate (51) corresponds to the entrance position of the upper hopper (61) or the lower hopper (62). One end of the telescopic drive (52) is hinged to the frame (8), and the other end of the telescopic drive (52) is hinged to the lower surface of the material distribution plate (51).

10. A method of using the straight-tube endoscopic detection device as described in any one of claims 1 to 9, characterized in that, The steps are as follows: Step 1: The control component controls the detection device to send the straight tube to be detected to the detection position; the control component identifies the identification code (412) on the lens inlet component (41) through the identification camera (7) to determine whether the lens inlet component (41) matches the straight tube to be detected; Step 2: The deployment mechanism (4) sends the detection lens along with the first lens protection head (413) and the second lens protection head (414) into the inside of the straight pipe to be tested. The first lens protection head (413) and the second lens protection head (414) contact the inner wall of the pipe to be tested, and the detection lens captures an image of the inner wall surface of the pipe. Step 3: The control component classifies the images captured by the detection lens and outputs the detection results.

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