A high speed screening apparatus for thermocouple sensor protection sleeves

Abstract

The application relates to the technical field of pipe screening equipment, and specifically discloses a high-speed screening equipment for thermocouple sensor protection sleeves, which comprises a machine body, feeding channels, a flaw channel and a qualified channel arranged on the machine body, and conveying rollers arranged in the machine body. Two rows of conveying rollers correspond to each feeding channel, and the two rows of conveying rollers are both arranged in an inclined mode. The bottom of each conveying roller is arranged in an inclined mode towards a workpiece, and the top of each conveying roller is arranged in an inclined mode away from the workpiece. One row of the conveying rollers is arranged in an inclined mode downwards from one end close to the feeding channel to the other end away from the feeding channel, and the other row of the conveying rollers is arranged in an inclined mode upwards from one end close to the feeding channel to the other end away from the feeding channel. A feeding conveying belt is arranged between the conveying rollers and the flaw channel. An industrial camera is arranged above the conveying rollers. An inner wall detection mechanism for detecting the inner wall of the workpiece and a screening mechanism for changing the direction of the workpiece are further arranged on the machine body. The application has the effect of reducing the detection loopholes in the detection process of the workpiece.

Description

Technical Field

[0001] This application relates to the field of pipe screening equipment technology, and in particular to a high-speed screening equipment for thermocouple sensor protective sleeves. Background Technology

[0002] Thermocouple sensor protective sheaths are key components that ensure the stable operation of thermocouples under harsh conditions. Their core functions include mechanical protection, high temperature resistance, and corrosion resistance. They are typically made of metal alloys, ceramics and metal compounds, or non-metallic materials.

[0003] When screening workpieces for qualified and defective products, the main method is to inspect the workpieces using industrial vision. Specifically, the workpieces are first arranged end to end by a tube sorting machine and then fed into the screening equipment. The workpieces are transported at high speed by a conveyor belt in the screening equipment. At the same time, an industrial camera above the conveyor belt inspects the surface of the workpieces for defects, to determine whether the sleeve has bending, cracks, burrs, pits, etc. After inspection, qualified workpieces enter the qualified channel, while unqualified workpieces are blown into the defective channel by air pulse.

[0004] Regarding the aforementioned technologies, the inventors believe that the following defects exist: the industrial camera on the conveyor belt can only detect the side of the workpiece facing the industrial camera, while the inner wall of the workpiece and the side facing away from the industrial camera cannot be detected, thus creating a large detection loophole. Summary of the Invention

[0005] To address the issue of significant detection loopholes during high-speed workpiece transport, this application provides a high-speed screening device for thermocouple sensor protective sleeves.

[0006] The high-speed screening equipment for thermocouple sensor protective sheaths provided in this application adopts the following technical solution:

[0007] A high-speed screening device for thermocouple sensor protective sheaths includes a machine body, an infeed channel, a defect channel, and a qualified channel disposed on the machine body. The device is characterized by: conveyor rollers disposed within the machine body; each infeed channel corresponds to two rows of conveyor rollers, both rows being inclined; the bottom of the conveyor rollers is inclined towards the workpiece, and the top is inclined away from the workpiece; one row of conveyor rollers is inclined downwards from the end near the infeed channel, and the other row is inclined upwards from the end near the infeed channel; a feeding conveyor belt is disposed between the conveyor rollers and the defect channel; the qualified channel is located on one side of the feeding conveyor belt; an industrial camera is disposed above the conveyor rollers on the machine body, and one industrial camera can photograph multiple workpieces; the machine body also includes an inner wall detection mechanism for detecting the inner wall of the workpiece and a screening mechanism for changing the orientation of the workpiece.

[0008] By adopting the above technical solution, the workpiece enters the conveyor rollers through the feeding channel and is supported by two rows of inclined conveyor rollers. Due to the inclined setting of the conveyor rollers, the workpiece is subjected to both a forward conveying force in the horizontal direction and a tangential force in the vertical direction tangential to the workpiece surface with opposite directions on both sides. This causes the workpiece to rotate during the conveying process. Since the industrial camera captures multiple workpieces at once, and the face of the workpiece facing the industrial camera is different at different positions on the conveyor rollers, the industrial camera can perform a thorough inspection of the workpiece surface without blind spots by capturing multiple batches of images. At the same time, during the workpiece conveying process, the inner wall inspection mechanism inspects the inner wall of the workpiece to determine whether there are any defects. After the inspection is completed, the workpiece is conveyed to the feeding conveyor belt for further transport. When there are defects on the inner wall and / or outer wall of the workpiece, the screening mechanism sends the defective workpiece to the defect channel and the qualified workpiece to the qualified channel. This inspection process inspects both the inner and outer walls of the workpiece, greatly reducing the phenomenon of inspection loopholes.

[0009] Optionally, the inner wall detection mechanism includes a drive conveyor belt disposed below the conveyor roller, a plurality of industrial endoscopes disposed on the drive conveyor belt, and a control component for controlling the speed of the industrial endoscopes. The insertion depth of the industrial endoscopes is not less than the length of the workpiece, and the distance between two adjacent workpieces located on the conveyor rollers is greater than the horizontal length of the industrial endoscopes when they are in operation.

[0010] By adopting the above technical solution, when the workpiece is conveyed on the conveyor roller, the drive conveyor belt moves the industrial endoscope. The control component first controls the industrial endoscope to decelerate, so that the speed of the industrial endoscope in front of the workpiece is lower than that of the workpiece, and then the industrial endoscope gradually enters the workpiece. During this process, the industrial endoscope inspects the workpiece. Then, the control component increases the moving speed of the industrial endoscope, so that the industrial endoscope leaves the workpiece. During this process, the industrial endoscope re-inspects the workpiece to reduce the inspection error of the industrial endoscope. Since the workpiece also rotates during the conveying process, the blind spot of the industrial endoscope is further reduced.

[0011] Optionally, the control component includes a control frame disposed on the drive conveyor belt, a support plate slidably connected to the control frame, a constant force spring disposed between the control frame and the support plate, and an electromagnet disposed on the side of the drive conveyor belt. The control frame is made of insulating material, and the support plate is made of conductive material.

[0012] By adopting the above technical solution, the drive control frame of the drive conveyor belt runs at a speed consistent with the workpiece conveying speed. When the industrial endoscope moves to the position of the electromagnet, the magnetic field generated by the electromagnet acts on the support plate. According to Lenz's law, the support plate decelerates at this time. When the support plate moves to a position other than the electromagnet, the support plate accelerates again under the action of the constant force spring, so that the industrial endoscope can be detached from the workpiece.

[0013] Optionally, there are two sets of electromagnets arranged on both sides of the drive conveyor belt. The ends of the two sets of electromagnets that are close to each other are of opposite polarity, and a magnetic sheet is connected between the ends of the two sets of electromagnets that are far apart from each other.

[0014] By adopting the above technical solution, the two sets of electromagnets are arranged opposite each other, making the magnetic field on the support plate more concentrated and stronger. The magnetic conductive sheet further guides the magnetic field lines, thereby making the magnetic field lines of the two electromagnets in a closed loop, effectively reducing magnetic leakage and reducing the impact of the magnetic field on conductive workpieces.

[0015] Optionally, the end of the support plate near the industrial endoscope is made of an insulating high magnetic resistance material.

[0016] By adopting the above technical solution, when the support plate moves into the effective range of the electromagnet, a small induced current will be generated on the support plate. In addition to reducing the magnetic field lines entering the industrial endoscope, the insulated high magnetic resistance part of the support plate also avoids the small induced current from affecting the industrial endoscope.

[0017] Optionally, the industrial endoscope is equipped with an auxiliary light source, and the lens of the industrial endoscope is a fisheye lens.

[0018] By adopting the above technical solutions, the auxiliary light source improves the clarity of the industrial endoscope after it enters the workpiece, while the fisheye lens has a larger field of view coverage and is more suitable for rapid panoramic scanning. Furthermore, since the workpiece is always rotating, it also avoids misjudgment caused by tiny debris on the lens surface of the industrial endoscope.

[0019] Optionally, the screening mechanism is an air nozzle disposed on the side of the feeding conveyor belt opposite the qualified channel, the workpiece rotates on the conveyor roller in the direction of facing the side close to the air nozzle, and a guide rod is disposed on the side of the feeding conveyor belt close to the air nozzle.

[0020] By adopting the above technical solution, after the workpiece is inspected, when it enters the feeding conveyor belt, the workpiece still has its own rotational inertia. At this time, the workpiece rotates until it contacts the guide rod. When the workpiece is conveyed to the air nozzle, if the workpiece is qualified, the air nozzle blows the qualified workpiece into the qualified channel. If the workpiece is defective, the defective workpiece continues to be conveyed until it falls into the defective channel, thus completing the screening of the workpiece. Moreover, because the workpiece is affected by its own rotation, there is no need to add an additional limiting mechanism on the side of the feeding conveyor belt near the qualified channel to maintain the trajectory of the workpiece during the conveying process, nor is it necessary to add an electric baffle at the qualified channel to control the opening and closing of the qualified channel.

[0021] Optionally, a suction pipe is provided inside the machine body at one end below the conveying roller and near the feed channel.

[0022] By adopting the above technical solution, after the workpiece falls onto the conveyor roller from the feeding channel, the suction pipe continuously sucks the workpiece, increasing the pressure between the workpiece and the conveyor roller, thereby increasing the friction between the workpiece and the conveyor roller, reducing the slippage of the workpiece on the conveyor roller, and at the same time, the greater suction force removes dust and other impurities attached to the workpiece, so as to improve the accuracy of subsequent inspection.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. The inclined setting of the conveyor rollers allows the workpiece to not only move linearly during the conveying process but also rotate. Since the industrial camera can capture multiple workpieces at once, and the face of the workpiece facing the industrial camera is different when it is at different positions on the conveyor rollers, the industrial camera can perform a blind-angle inspection of the workpiece surface by capturing multiple batches of images.

[0025] 2. The drive conveyor belt moves the industrial endoscope. When the industrial endoscope moves to the position of the electromagnet, the magnetic field generated by the electromagnet acts on the support plate. At this time, the support plate decelerates, so that the speed of the industrial endoscope in front of the workpiece is lower than that of the workpiece, and the industrial endoscope gradually enters the workpiece. During this process, the industrial endoscope inspects the workpiece. Then, when the support plate moves to a position other than the electromagnet, the support plate accelerates again under the action of the constant force spring, and the industrial endoscope detaches from the workpiece. During this process, the industrial endoscope re-inspects the workpiece to reduce the inspection error of the industrial endoscope. Moreover, the moving speed of the industrial endoscope can be controlled by adjusting the power of the electromagnet, and the adjustment method is simpler than other purely mechanical methods.

[0026] 3. The two sets of electromagnets are arranged opposite each other, which makes the magnetic field on the support plate more concentrated and the magnetic field strength greater. The magnetic sheet further guides the magnetic field lines, so that the magnetic field lines of the two electromagnets are in a closed loop, which effectively reduces the leakage of magnetic field and reduces the impact of the magnetic field on the conductive workpiece.

[0027] 4. After the workpiece is inspected, when it enters the feeding conveyor belt, due to the workpiece's rotational inertia, the workpiece rotates until it contacts the guide rod. When the workpiece is conveyed to the air nozzle, if the workpiece is qualified, the air nozzle blows the qualified workpiece into the qualified channel. If the workpiece is defective, the defective workpiece continues to be conveyed until it falls into the defective channel, thus completing the screening of the workpiece. Furthermore, due to the influence of the workpiece's rotation, there is no need to add an additional limiting mechanism on the side of the feeding conveyor belt near the qualified channel to maintain the trajectory of the workpiece during the conveying process, nor is it necessary to add an electric baffle at the qualified channel to control the opening and closing of the qualified channel. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application;

[0029] Figure 2 This is a schematic diagram of the internal structure of the machine body according to an embodiment of this application;

[0030] Figure 3 This embodiment of the application is used to illustrate the structural intent of the inner wall detection mechanism;

[0031] Figure 4 This is a cross-sectional structural schematic diagram of the industrial endoscope, control block, support plate, and constant force spring of this application.

[0032] Reference numerals: 1. Machine body; 11. Feed channel; 12. Defect channel; 13. Qualified channel; 21. Conveyor roller; 22. Industrial camera; 3. Feeding conveyor belt; 4. Inner wall detection mechanism; 41. Drive conveyor belt; 42. Industrial endoscope; 43. Control components; 44. Control frame; 45. Support plate; 46. Constant force spring; 47. Electromagnet; 5. Screening mechanism; 51. Air nozzle; 52. Guide rod; 6. Suction pipe; 7. Tube straightening machine. Detailed Implementation

[0033] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0034] This application discloses a high-speed screening device for thermocouple sensor protective sheaths. (Refer to...) Figure 1 and Figure 2The high-speed screening equipment for thermocouple sensor protective sheaths includes a body 1, a feed channel 11, a defect channel 12, and a qualified channel 13 set on the body 1. Conveyor rollers 21 are installed inside the body 1. Each feed channel 11 corresponds to two rows of conveyor rollers 21. This application has two feed channels 11, and both rows of conveyor rollers 21 are inclined. The bottom of the conveyor rollers 21 is inclined towards the workpiece, and the top is inclined away from the workpiece. One row of conveyor rollers 21 is inclined downwards from the end closest to the feed channel 11 to the end furthest from the feed channel 11, while the other row is inclined downwards from the end furthest from the feed channel 11. The conveying roller 21 is inclined upward from the end near the feed channel 11 to the end away from the feed channel 11. Each row of conveying rollers 21 can be driven by a set of transmission belts with bevel gears in cooperation with the bevel gears at the ends of the conveying rollers 21. Alternatively, a set of conveying rollers 21 can be connected to a drive shaft, and a universal joint can be installed between the drive shaft and the conveying rollers 21 to drive the conveying rollers 21. The bevel gears can be designed to have a large size range, which can better adapt to the smaller size of the conveying rollers 21, while the universal joints facilitate the adjustment of the inclination of the conveying rollers 21.

[0035] By controlling the conveyor roller 21 to drive the workpiece to move at a speed greater than the feeding speed of the feed channel 11, the distance between adjacent workpieces on the conveyor roller 21 is changed. A feeding conveyor belt 3 is provided between the conveyor roller 21 and the defect channel 12. The qualified channel 13 is located on one side of the feeding conveyor belt 3. An industrial camera 22 is provided above the conveyor roller 21 on the machine body 1, and one industrial camera 22 can photograph multiple workpieces. The machine body 1 is also provided with an inner wall detection mechanism 4 for detecting the inner wall of the workpiece and a screening mechanism 5 for changing the direction of the workpiece.

[0036] The workpieces are arranged end-to-end by the tube sorting machine 7 and fed into the feeding channel 11. They then enter the conveyor rollers 21 and are supported by two rows of inclined conveyor rollers 21. Due to the inclined arrangement of the conveyor rollers 21, the workpieces are subjected to both a forward conveying force in the horizontal direction and a vertical force tangential to the workpiece surface in opposite directions. This causes the workpieces to rotate during the conveying process. The industrial camera 22 captures multiple workpieces at a time, and the face of each workpiece facing the camera 22 varies depending on its position on the conveyor rollers 21. This results in the industrial camera... 22. By taking multiple batches of photos, the surface of the workpiece can be inspected without any blind spots. At the same time, during the conveying process of the workpiece, the inner wall inspection mechanism 4 inspects the inner wall of the workpiece to determine whether there are any defects on the inner wall. After the inspection is completed, the workpiece is conveyed to the feeding conveyor belt 3. When there are defects on the inner wall and / or outer wall of the workpiece, the screening mechanism 5 causes the defective workpiece to enter the defect channel 12, while the qualified workpiece enters the qualified channel 13. This inspection process inspects both the inner and outer walls of the workpiece, which greatly reduces the phenomenon of inspection loopholes in the workpiece.

[0037] Reference Figure 2 , Figure 3 and Figure 4 The inner wall detection mechanism 4 includes a drive conveyor belt 41 disposed below the conveyor roller 21, multiple industrial endoscopes 42 disposed on the drive conveyor belt 41, and a control component 43 for controlling the speed of the industrial endoscopes 42. The industrial endoscopes 42 can be wireless or wired. Wired endoscopes require additional structures such as rotary joints to maintain the continuous movement of the industrial endoscopes 42, while wireless endoscopes are simpler but have higher maintenance costs. The control component 43 includes a control frame 44 disposed on the drive conveyor belt 41, a support plate 45 slidably connected to the control frame 44, a constant force spring 46 disposed between the control frame 44 and the support plate 45, and an electromagnet 47 disposed on the side of the drive conveyor belt 41. In this application, the constant force spring 46 is a tension spring, the control frame 44 is made of insulating material, and the support plate 45 is made of conductive material. The control frame 44 can be made of plastic or ceramic, and the support plate 45 can be made of copper, aluminum, aluminum alloy, etc.

[0038] The insertion depth of the industrial endoscope 42 is not less than the length of the workpiece, and the distance between two adjacent workpieces on the conveyor roller 21 is greater than the horizontal length of the industrial endoscope 42 when it is in operation. Compared with other inspection methods such as ultrasonic testing and eddy current testing, the visual inspection method of the industrial endoscope is more efficient, non-contact, has higher inspection accuracy, and provides more direct information about the workpiece surface.

[0039] When the workpiece is conveyed on the conveyor roller 21, the drive conveyor belt 41 drives the industrial endoscope 42 to move. When the industrial endoscope 42 moves to the position of the electromagnet 47, the magnetic field generated by the electromagnet 47 acts on the support plate 45. At this time, the support plate 45 decelerates, so that the speed of the industrial endoscope 42 in front of the workpiece is lower than that of the workpiece, and thus the industrial endoscope 42 gradually enters the workpiece. During this process, the industrial endoscope 42 inspects the workpiece. Then, when the support plate 45 moves to a position other than the electromagnet 47, the support plate 45 is accelerated by the constant force spring 46, thus causing the industrial endoscope 42 to detach from the workpiece. During this process, the industrial endoscope 42 re-inspects the workpiece to reduce the inspection error of the industrial endoscope 42. Since the workpiece also rotates during the conveying process, the blind spot of the industrial endoscope 42 is further reduced. Moreover, the moving speed of the industrial endoscope 42 can be controlled by adjusting the power of the electromagnet 47, which is simpler than other purely mechanical methods.

[0040] Reference Figure 3Two sets of electromagnets 47 are arranged on both sides of the drive conveyor belt 41. The ends of the two sets of electromagnets 47 that are close to each other are of opposite polarity, and a magnetic conductive sheet is connected between the ends of the two sets of electromagnets 47 that are far apart from each other. The two sets of electromagnets 47 are arranged opposite each other, which makes the magnetic field on the support plate 45 more concentrated and stronger. The magnetic conductive sheet further guides the magnetic field lines, so that the magnetic field lines of the two electromagnets 47 are in a closed loop, effectively reducing magnetic leakage and minimizing the impact of the magnetic field on the conductive workpiece.

[0041] Reference Figure 4 The end of the support plate 45 closest to the industrial endoscope 42 is made of an insulating high magnetic resistance material, which can be plastic or ceramic. When the support plate 45 moves into the effective range of the electromagnet 47, a small induced current is generated on the support plate 45. The insulating high magnetic resistance part of the support plate 45 not only reduces the magnetic field lines entering the industrial endoscope 42, but also prevents the small induced current from affecting the industrial endoscope 42.

[0042] Reference Figure 4 The industrial endoscope 42 is equipped with an auxiliary light source, and its lens is a fisheye lens. The auxiliary light source improves the clarity of the endoscope 42 after it enters the workpiece, while the fisheye lens has a wider field of view and is more suitable for rapid panoramic scanning. Furthermore, because the workpiece is constantly rotating, it avoids misjudgments caused by tiny debris on the lens surface. When the path that the endoscope 42 can detect is long and the workpiece rotates quickly, a combination of a side-viewing lens and a direct-viewing lens can be used. The side-viewing and direct-viewing lenses have lower imaging distortion and higher detection accuracy compared to the fisheye lens.

[0043] Reference Figure 2The screening mechanism 5 consists of an air nozzle 51 located on the opposite side of the qualified channel 13 on the feeding conveyor belt 3. The workpiece rotates on the conveyor roller 21 towards the side closest to the air nozzle 51. A guide rod 52 is provided on the side of the feeding conveyor belt 3 closest to the air nozzle 51. After the workpiece is inspected, when it enters the feeding conveyor belt 3, due to its rotational inertia, the workpiece rotates until it contacts the guide rod 52. When the workpiece is conveyed to the air nozzle 51, if it is a qualified product, the air nozzle 51 blows the qualified workpiece into the qualified channel 13. If it is a defective product, the defective workpiece continues to be conveyed until it falls into the defective channel 12, thus completing the screening of the workpiece. Since the workpiece is always on the side of the guide rod 52 due to its rotation, there is no need to add additional limiting mechanisms such as baffles or stops on the side of the feeding conveyor belt 3 closest to the qualified channel 13 to maintain the trajectory of the workpiece during the conveying process. There is also no need to add an electric baffle at the qualified channel 13 to control the opening and closing of the qualified channel 13. Furthermore, there is no need to use an inclined feeding conveyor belt 3 to form an angle with the diameter of the guide rod 52. If the feeding conveyor belt 3 is inclined, it is very easy for some minor errors during the workpiece conveying process to cause insufficient power of the airflow on the workpiece or trajectory deviation.

[0044] Reference Figure 2 Inside the machine body 1, below the conveyor roller 21 and near the feed channel 11, a suction pipe 6 is installed. After the workpiece falls from the feed channel 11 onto the conveyor roller 21, the suction pipe 6 continuously suctions the workpiece, increasing the pressure between the workpiece and the conveyor roller 21, thereby increasing the friction between the workpiece and the conveyor roller 21 and reducing the slippage of the workpiece on the conveyor roller 21. At the same time, the greater suction force removes dust and other impurities attached to the workpiece, so as to improve the accuracy of subsequent inspection.

[0045] The implementation principle of a high-speed screening device for thermocouple sensor protective sleeves in this application embodiment is as follows: The workpiece enters the conveyor roller 21 through the feed channel 11 and is supported by two rows of conveyor rollers 21 at an incline. The air nozzle 51 cleans the workpiece and increases the friction between the workpiece and the conveyor roller 21. Due to the incline setting of the conveyor roller 21, the workpiece is subjected to both the forward conveying force in the horizontal direction and the tangential force along the vertical direction to the workpiece surface with opposite directions on both sides. As a result, the workpiece also rotates during the conveying process. Since the industrial camera 22 takes pictures of multiple workpieces at one time, and the face of the workpiece facing the industrial camera 22 is different when it is at different positions on the conveyor roller 21, the industrial camera 22 can perform no dead angle detection on the surface of the workpiece by taking pictures in multiple batches.

[0046] Meanwhile, when the workpiece is conveyed on the conveyor roller 21, the drive conveyor belt 41 drives the industrial endoscope 42 to move. When the industrial endoscope 42 moves to the position of the electromagnet 47, the magnetic field generated by the electromagnet 47 acts on the support plate 45. At this time, the support plate 45 decelerates, so that the speed of the industrial endoscope 42 located in front of the workpiece is lower than that of the workpiece, and thus the industrial endoscope 42 gradually enters the workpiece. During this process, the industrial endoscope 42 inspects the workpiece. Then, when the support plate 45 moves to a position other than the electromagnet 47, the support plate 45 is accelerated by the constant force spring 46, thus causing the industrial endoscope 42 to detach from the workpiece. During this process, the industrial endoscope 42 re-inspects the workpiece to reduce the detection error of the industrial endoscope 42.

[0047] After the workpiece is inspected, when it enters the feeding conveyor belt 3, the workpiece still has its own rotational inertia. At this time, the workpiece rotates until it comes into contact with the guide rod 52. When the workpiece is conveyed to the air nozzle 51, if the workpiece is qualified, the air nozzle 51 will blow the qualified workpiece into the qualified channel 13. If the workpiece is defective, the defective workpiece will continue to be conveyed until it falls into the defective channel 12, thus completing the screening of the workpiece.

[0048] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A high-speed screening device for thermocouple sensor protective sheaths, comprising a body (1), a feed channel (11), a defect channel (12), and a qualified channel (13) disposed on the body (1), characterized in that: The machine body (1) is equipped with conveying rollers (21). Each feeding channel (11) corresponds to two rows of conveying rollers (21). Both rows of conveying rollers (21) are inclined. The bottom of the conveying rollers (21) is inclined towards the workpiece, and the top is inclined away from the workpiece. One row of conveying rollers (21) is inclined downwards from the end near the feeding channel (11) and downwards from the end away from the feeding channel (11). The other row of conveying rollers (21) is inclined downwards from the end near the feeding channel (11) and downwards from the end away from the feeding channel (11). One end of the feed channel (11) is inclined upward. A feeding conveyor belt (3) is provided between the conveying roller (21) and the defect channel (12). The qualified channel (13) is located on one side of the feeding conveyor belt (3). An industrial camera (22) is provided above the conveying roller (21) on the machine body (1). One industrial camera (22) can photograph multiple workpieces. The machine body (1) is also provided with an inner wall detection mechanism (4) for detecting the inner wall of the workpiece and a screening mechanism (5) for changing the direction of the workpiece. The inner wall detection mechanism (4) includes a drive conveyor belt (41) disposed below the conveyor roller (21), a plurality of industrial endoscopes (42) disposed on the drive conveyor belt (41), and a control component (43) for controlling the speed of the industrial endoscopes (42). The insertion depth of the industrial endoscopes (42) is not less than the length of the workpiece, and the distance between two adjacent workpieces on the conveyor roller (21) is greater than the horizontal length of the industrial endoscopes (42) when they are in operation. The control component (43) includes a control frame (44) disposed on the drive conveyor belt (41), a support plate (45) slidably connected to the control frame (44), a constant force spring (46) disposed between the control frame (44) and the support plate (45), and an electromagnet (47) disposed on the side of the drive conveyor belt (41). The control frame (44) is made of insulating material, and the support plate (45) is made of conductive material.

2. The high-speed screening equipment for thermocouple sensor protective sheaths according to claim 1, characterized in that: There are two sets of electromagnets (47) arranged on both sides of the drive conveyor belt (41). The ends of the two sets of electromagnets (47) that are close to each other are opposite in polarity, and a magnetic sheet is connected between the ends of the two sets of electromagnets (47) that are far apart from each other.

3. The high-speed screening equipment for thermocouple sensor protective sheaths according to claim 1, characterized in that: The end of the support plate (45) near the industrial endoscope (42) is made of an insulating high magnetic resistance material.

4. The high-speed screening equipment for thermocouple sensor protective sheaths according to claim 1, characterized in that: The industrial endoscope (42) is equipped with an auxiliary light source, and the lens of the industrial endoscope (42) is a fisheye lens.

5. The high-speed screening equipment for thermocouple sensor protective sheaths according to claim 1, characterized in that: The screening mechanism (5) is an air nozzle (51) set on the side of the feeding conveyor belt (3) opposite to the qualified channel (13). The rotation direction of the workpiece on the conveyor roller (21) is towards the side close to the air nozzle (51). A guide rod (52) is set on the side of the feeding conveyor belt (3) close to the air nozzle (51).

6. The high-speed screening equipment for thermocouple sensor protective sheaths according to claim 1, characterized in that: A suction pipe (6) is provided inside the machine body (1) below the conveying roller (21) and near the feed channel (11).

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