Lining detection mechanism

Abstract

The utility model discloses a bushing detection mechanism, the bushing detection mechanism comprises a caliber detection assembly used for bushing caliber detection, the caliber detection assembly comprises a recovery pipeline obliquely arranged on a conveyer belt, a caliber detection pin is vertically arranged in the recovery pipeline in a sliding manner, the recovery pipeline is provided with a driving member, and the driving member is connected with the caliber detection pin. The driving part is used for driving the caliber detection pin to vertically move, a detection opening for the caliber detection pin to extend out of the detection lining is formed in the recovery pipeline, a blocking plate is arranged on the detection opening in a sliding mode, a driven part is arranged in the recovery pipeline, and the driving part is connected with the blocking plate through the driven part. According to the lining detection mechanism provided by the utility model, the inner diameter detection and the outer diameter detection are carried out step by step, the qualified lining automatically enters the outer diameter detection position after the inner diameter detection is completed, the process is natural, and the dead time of the lining in the detection process is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of bushing inspection technology, specifically, it relates to a bushing inspection mechanism. Background Technology

[0002] In bushing manufacturing, bushing diameter inspection is divided into inner diameter and outer diameter inspection. Inner diameter inspection includes cases where the bushing inner diameter is smaller or larger than the standard inner diameter size, while outer diameter inspection only includes cases where the size is smaller. Although cases where the outer diameter is too large may also occur, for example, due to improper tool installation during processing or excessive blank size, overall, cases where the outer diameter is too small are relatively more common in bushing manufacturing due to the influence of various factors such as processing technology, material properties, and measurement errors.

[0003] Bushing caliber testing typically involves transporting manufactured bushings in batches via conveyor belts to the testing facility. Current testing processes face the following technical bottlenecks:

[0004] 1. The mechanical linkage between the inner diameter inspection and outer diameter inspection is weak. After the qualified bushing completes the inner diameter inspection, it needs to be transferred to the outer diameter inspection position through an additional transmission mechanism, which causes a stage of stagnation in the inspection process and affects the continuity of batch inspection.

[0005] 2. The inner diameter detection component relies on a single detection specification to distinguish different types of abnormalities, making it difficult to accurately define the defect boundary of excessively large or small inner diameters. This may result in bushings with excessively large inner diameters flowing into the next stage without being effectively blocked, or bushings with excessively small inner diameters failing to be accurately detected due to the structural limitations of the detection component.

[0006] 3. When defective products leave the inspection station after inspection, there is no anti-backflow blocking mechanism synchronized with the inspection action. Defective products may return to the conveyor belt due to gravity or conveying inertia. At the same time, the separation process of defective products from the inspection station to the recycling channel relies on rigid contact separation, which can easily cause bushing damage or blockage of the recycling path. Utility Model Content

[0007] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a bushing detection mechanism.

[0008] To achieve the aforementioned objectives, the technical solution adopted by this utility model includes:

[0009] A caliber detection assembly for bushing caliber detection includes a recovery pipe inclinedly mounted on a conveyor belt, a caliber detection pin vertically slidably disposed within the recovery pipe, a driving component on the recovery pipe for driving the caliber detection pin to move vertically, a detection port within the recovery pipe for the caliber detection pin to extend out and detect the bushing, a sealing plate slidably disposed on the detection port, a driven component within the recovery pipe, and the driving component connected to the sealing plate via the driven component. When the caliber detection pin moves toward the bushing, the driven component pulls the sealing plate to move and open the detection port. A separating component within the recovery pipe allows the defective product to be dislodged by the separating component and slid out along the recovery pipe when the caliber detection pin returns to its original position carrying a defective product.

[0010] In this invention, when detecting the bushing diameter, the driving component drives the diameter detection pin to move vertically downward, causing the driven component to pull the sealing plate to open the detection port in time. When the diameter detection pin detects a defective product, it will carry the defective product into the recycling pipe. The sealing plate will slide down under its own weight and seal the detection port again. During the process of the diameter detection pin moving and resetting, the separating component separates the defective product from the diameter detection pin. The defective product will fall into the recycling pipe under its own weight and slide out and be collected along the inclined pipe wall of the recycling pipe. The detection and recycling of defective products are completed in one go and can be carried out continuously, which improves the efficiency of bushing diameter detection and facilitates batch detection of bushing diameter.

[0011] Preferably, the caliber detection pin includes an inner diameter detection pin and an outer diameter detection pin, and the inner diameter detection pin and the outer diameter detection pin are linearly distributed.

[0012] In this invention, the inner diameter detection pin is used to detect the inner diameter of the bushing. When the inner diameter of the bushing exceeds or is less than the allowable error range of the tolerance, it will be clamped and moved by the inner diameter detection pin. When the outer diameter of the bushing is too large, it will be carried by the outer diameter detection pin into the recycling pipe, thereby recycling defective products.

[0013] Preferably, the driving component includes a first cylinder and a second cylinder, wherein the telescopic end of the first cylinder is connected to the outer diameter detection pin, and the telescopic end of the second cylinder is connected to the inner diameter detection pin.

[0014] Preferably, the driven component includes a traction rope, a pulley system is provided inside the recovery pipe, the traction rope is slidably connected to the pulley system, one end of the traction rope is connected to a diameter detection pin, and the other end of the traction rope is connected to a sealing plate.

[0015] In this invention, the pulley system reduces the frictional resistance of the traction rope during sliding while guiding the traction direction of the traction rope, enabling the traction rope to pull the sealing plate to move towards a higher tilt of the recovery pipe.

[0016] Preferably, the separating component includes two separating frames and two arc-shaped separating plates, the inner diameter detection pin is disposed between the two separating frames, the outer diameter detection pin has an outer diameter detection hole in the middle, and the two arc-shaped separating plates are disposed above the outer diameter detection hole.

[0017] In this invention, when the inner diameter detection pin carries the defective product back to its original position, the defective product will be squeezed against the separating frame and fall off. Similarly, when the outer diameter detection pin carries the defective product with a smaller outer diameter to its original position, the defective product will be pushed off the outer diameter detection pin by the arc-shaped separating plate, thereby quickly separating the defective product. The defective product will fall off and slide down the inclined pipe wall of the recycling pipe for collection, which is convenient for subsequent processing of the defective product.

[0018] Preferably, the recycling pipe has a sliding groove for the sealing plate to slide in, the sliding groove forms an angle with the horizontal plane, the top of the sliding groove is provided with two limiting strips, and the sealing plate is disposed between the sliding groove and the limiting strips.

[0019] In this invention, the combination of a sliding groove and a limiting strip allows the sealing plate to slide only within the sliding groove. The inclination angle of the sliding groove is the same as that of the recovery pipe, and the angle between the sliding groove and the horizontal plane is between ° and °. This allows the sealing plate to slide down at a relatively slow speed to seal the detection port, preventing the detection port from being prematurely sealed due to excessive sliding speed. This also avoids interference with the movement of the inner and outer diameter detection pins. Furthermore, the sealing plate is also pulled by the diameter detection pin, so that when the diameter detection pin just begins to move and reset, the sliding of the sealing plate is also pulled by the traction rope. This prevents the sliding speed of the sealing plate from exceeding the movement and reset speed of the inner and outer diameter detection pins, thus ensuring the effective recycling of defective products.

[0020] Preferably, the outer diameter detection pin is provided with a plurality of elastic pieces, and there is a gap between the plurality of elastic pieces.

[0021] It should be noted that the bushing with a smaller outer diameter weighs less than the bushing with a standard size. The combination of multiple elastic plates can only support the bushing with a smaller outer diameter. The bushing with a standard size will deform due to its own weight when the outer diameter detection pin is initially reset, and will fall back onto the conveyor belt.

[0022] Preferably, the inner diameter detection pin includes a coarse-mouth detection post, the bottom of which is connected to a fine-mouth detection post, and the bottom of which is connected to a standard-mouth detection post.

[0023] In this invention, bushings with the correct inner diameter will pass through the standard opening detection post and the thin post, while the coarse opening detection post will block the bushing from entering. When a bushing with a smaller inner diameter is present, it will be stuck on the standard opening detection post and unable to fall off. When a bushing with a larger inner diameter is present, it will pass through the standard opening detection post and the thin post in sequence, and then be stuck on the coarse opening detection post. This allows defective products to be carried away by the inner diameter detection pin.

[0024] It should be noted that although the bushing has different inner diameters during inner diameter testing, the difference in inner diameter does not affect the contact between the separator and the side of the bushing during separation. Therefore, it will not interfere with the separation process of the separator separating the bushing, and the separator can effectively separate the bushing.

[0025] Compared with the prior art, the advantages of this utility model include:

[0026] (1) The bushing inspection mechanism provided by this utility model performs inner diameter inspection and outer diameter inspection in separate steps. After the inner diameter inspection is completed, the qualified bushing automatically enters the outer diameter inspection position. The process is naturally connected, reducing the stagnation time of the bushing during the inspection process.

[0027] (2) The bushing inspection mechanism provided by this utility model uses a combination of a coarse-mouth inspection post, a fine-mouth inspection post, and a standard-mouth inspection post to accurately distinguish between bushings with excessively large, excessively small, and qualified inner diameters. Bushings with smaller inner diameters are clamped onto the standard-mouth inspection post, while bushings with larger inner diameters are clamped onto the coarse-mouth inspection post, ensuring that defective products are accurately identified and carried away.

[0028] (3) The bushing detection mechanism provided by this utility model has gaps between multiple elastic plates on the outer diameter detection pin, which can only support bushings with smaller outer diameters. Standard-sized bushings will fall off due to their own weight when the outer diameter detection pin is reset, thereby accurately identifying defective products with smaller outer diameters;

[0029] (4) The bushing detection mechanism provided by this utility model allows for automated recycling of defective products. When the inner diameter detection pin carries defective products into the recycling pipe, the sealing plate slides down under its own weight to seal the detection port, preventing the defective products from returning to the conveyor belt. Subsequently, the separating frame separates the defective products from the inner diameter detection pin. Due to its own weight, the defective products slide out and are collected along the inclined pipe wall of the recycling pipe, eliminating the need for manual operation and achieving automated recycling of defective products. When the outer diameter detection pin repositions with defective products of smaller outer diameter, the sealing plate seals the detection port, and the arc-shaped separating plate squeezes the defective products, causing them to pass through the elastic sheet and fall into the recycling pipe for collection. This also achieves automated recycling and reduces the intensity of manual labor.

[0030] (5) The bushing detection mechanism provided by this utility model, when the driving component drives the diameter detection pin to move, pulls the sealing plate to move and open the detection port through the traction rope and pulley group, ensuring that the detection port opens in time during detection and does not affect the detection action of the diameter detection pin. The combination of the sliding groove and the limiting strip allows the sealing plate to slide only in the sliding groove, and the inclination angle of the sliding groove is the same as the inclination angle of the recovery pipe. The sliding speed of the sealing plate is relatively slow, avoiding premature sealing of the detection port due to excessive sliding speed, which would interfere with the movement of the diameter detection pin and ensure the smooth progress of detection and recovery operations. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this application 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 recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the connection structure between the bushing detection mechanism and the conveyor belt in this utility model;

[0033] Figure 2 This is a cross-sectional structural diagram of the bushing detection mechanism in this utility model;

[0034] Figure 3 This is a schematic diagram of the explosion effect of the bushing detection mechanism in this utility model;

[0035] Figure 4 This is a schematic diagram of the connection structure between the pulley block and the traction rope in this utility model;

[0036] Figure 5 This is a schematic diagram of the connection structure between the first cylinder and the outer diameter detection pin in this utility model;

[0037] Figure 6 This is a schematic diagram of the outer diameter detection pin in this utility model;

[0038] Figure 7 This is a schematic diagram of the inner diameter detection pin in this utility model.

[0039] Figure label:

[0040] 1. Conveyor belt; 11. Conveyor frame; 12. Limiting plate; 13. Conveying channel; 14. Speed ​​regulating motor; 2. Diameter detection assembly; 21. Recycling pipe; 22. First cylinder; 23. Second cylinder; 24. Limiting strip; 25. Sliding groove; 26. Supporting strip; 27. Detection port; 28. Separating frame; 29. ​​Sealing plate; 210. Outer diameter detection pin; 211. Arc-shaped separating plate; 212. Inner diameter detection pin; 213. Shortening frame; 214. Traction rope; 215. Connecting seat; 216. Upper pulley; 217. Lower pulley; 218. Upright pole; 219. Support plate; 220. Support leg; 221. Elastic sheet; 222. Coarse diameter detection column; 223. Fine diameter column; 224. Standard diameter detection column. Detailed Implementation

[0041] In view of the shortcomings of the prior art, the inventor of this utility model has, through long-term research and extensive practice, proposed the technical solution of this utility model. The following will further explain and illustrate the technical solution, its implementation process, and its principles in conjunction with the accompanying drawings and specific implementation examples.

[0042] It should be noted that the embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. The described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, the present invention covers any substitutions, modifications, equivalent methods and solutions made within the spirit, principles and scope of the present invention as defined by the claims. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] In the description of this application, the terms "first," "second," "third," and similar words do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms "a" or "one," and similar words, do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising" or "including," and similar words, mean that the elements or objects preceding "comprising" or "including" encompass the elements or objects listed following "comprising" or "including," and their equivalents, but do not exclude other elements or objects. The terms "connected" or "linked," and similar words, are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect.

[0044] In the description of this application, the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing this application and for simplification, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, when using positional terms such as "both sides," "outer side," and "upper and lower," it should be understood that they are used only for ease of understanding and description, taking into account that the structure may be oriented to other positions.

[0045] In the description of this application, unless otherwise expressly specified and limited, the technical or scientific terms used shall have the ordinary meaning understood by a person with ordinary skills in the art to which this application pertains. Terms such as “installation,” “connection,” and “joining” shall be interpreted broadly, for example, as fixed connection, detachable connection, mating connection, or integral connection. For a person skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0046] This utility model embodiment is intended to introduce and explain the structural composition of a bushing detection mechanism and the cooperation relationship between the various components. Unless otherwise specified, the dimensions, materials, and manufacturing processes of the various components in the bushing detection mechanism in this utility model embodiment can be selected according to specific circumstances, and no special limitations or explanations are made here.

[0047] Furthermore, to provide the public with a better understanding of this utility model, certain specific details are described in detail in the following description. However, those skilled in the art can fully understand this utility model even without these detailed descriptions. Example 1

[0048] Please see Figure 1 and Figure 2 This embodiment discloses a bushing detection mechanism, which is installed on a conveyor belt 1. The conveyor belt 1 includes a conveyor frame 11, with two toothed rollers meshing inside the conveyor frame 11. A toothed belt is meshed on the two toothed rollers. Two limiting plates 12 are provided on the top of the toothed belt, and a conveying channel 13 for conveying bushings is formed between the two limiting plates 12. A speed regulating motor 14 is provided on one side of the conveyor frame 11. The speed regulating motor 14 is connected to the toothed rollers. The speed regulating motor 14 has a speed regulator, which can adjust the bushing conveying speed by adjusting the rotation speed of the drive end of the speed regulating motor 14.

[0049] Please see Figure 3 and Figure 4This embodiment discloses a bushing detection mechanism, including a caliber detection component 2. The caliber detection component 2 includes a recovery pipe 21 that is inclinedly arranged on a conveyor belt 1, and a caliber detection pin is vertically slidably arranged inside the recovery pipe 21.

[0050] Specifically, the caliber detection pin includes an inner diameter detection pin 212 and an outer diameter detection pin 210. The inner diameter detection pin 212 and the outer diameter detection pin 210 are linearly distributed. The inner diameter detection pin 212 includes a coarse-mouth detection post 222. A fine post 223 is connected to the bottom of the coarse-mouth detection post 222, and a standard-mouth detection post 224 is connected to the bottom of the fine post 223.

[0051] Multiple elastic plates 221 are integrally formed on the outer diameter detection pin 210. The multiple elastic plates 221 can only support the bushing with a smaller outer diameter. The standard-sized bushing will be deformed by its own weight when the outer diameter detection pin 210 is initially reset, and will fall into the recycling pipe 21.

[0052] Please see Figure 4 , Figure 5 , Figure 6 and Figure 7 The recovery pipe 21 is equipped with a driving component, which is used to drive the diameter detection pin to move vertically. The recovery pipe 21 is provided with a detection port 27 for the diameter detection pin to extend out of the detection bushing.

[0053] In this embodiment, a sealing plate 29 is slidably installed on the detection port 27, and a driven member is provided in the recovery pipe 21. The driving member is connected to the sealing plate 29 through the driven member. When the diameter detection pin moves towards the bushing, the driven member pulls the sealing plate 29 to move and open the detection port 27. A separating member is provided in the recovery pipe 21. When the diameter detection pin carries the defective product back to its original position, the defective product is detached by the separating member and slides out along the recovery pipe 21.

[0054] It should be noted that a sliding groove 25 is provided inside the recycling pipe 21 for the sealing plate 29 to slide. The sliding groove 25 forms an angle with the horizontal plane. Two limiting strips 24 are provided at the top of the sliding groove. The sealing plate 29 is located between the sliding groove 25 and the limiting strips 24.

[0055] The sliding groove 25 has two support strips 26 at the connection between it and the detection port 27. When the sealing plate 29 slides down to the top of the detection port 27, the two support strips 26 can support the sealing plate 29 and provide it with support.

[0056] In this embodiment, the sliding groove 25 forms an angle of 20° with the horizontal plane, so that the sealing plate 29 can slide slowly down the sliding groove 25 and, after the defective product has completely entered the recycling pipe 21, seal the detection port 27 to prevent the defective product from returning to the conveyor belt 1. In other embodiments, the sliding groove 25 forms an angle of 15°, 25°, 30°, or 35° with the horizontal plane.

[0057] Specifically, the driving component includes a first cylinder 22 and a second cylinder 23. The telescopic end of the first cylinder 22 is connected to the outer diameter detection pin 210, and the telescopic end of the second cylinder 23 is connected to the inner diameter detection pin 212.

[0058] The top of the outer diameter detection pin 210 is fixedly connected to two support legs 220. The tops of the two support legs 220 are connected to a support plate 219. The outer diameter detection pin 210 is connected to the telescopic end of the first cylinder 22 through the support plate 219.

[0059] Furthermore, the driven component includes a traction rope 214, and a pulley block is provided inside the recovery pipe 21. The traction rope 214 is slidably connected to the pulley block. One end of the traction rope 214 is connected to the caliber detection pin, and the other end of the traction rope 214 is connected to the sealing plate 29.

[0060] The pulley system includes two upper pulleys 216 installed at the top of the recycling pipe 21 and a lower pulley 217 installed at the bottom of the recycling pipe 21. The two upper pulleys 216 and the lower pulley 217 are distributed at right angles. A connecting seat 215 is fixedly connected to the sealing plate 29, and the traction rope 214 is connected to the sealing plate 29 through the connecting seat 215.

[0061] It should be noted that by using the combination of the two upper pulleys 216 and the lower pulley 217, the sealing plate 29 can be moved towards a higher horizontal position of the recovery pipe 21 when the inner diameter detection pin 212 is pressed down, so that when the sealing plate 29 is freed from the traction of the traction rope 214, it can slide down by its own weight.

[0062] In this embodiment, a shorting bracket 213 is fixedly connected to the inner diameter detection pin 212, and the inner diameter detection pin 212 is connected to the traction rope 214 through the shorting bracket 213, while the outer diameter detection pin 210 is not connected to the traction rope 214.

[0063] Please see Figure 3 and Figure 4The separation component includes two separation frames 28 and two arc-shaped separation plates 211. Both separation frames 28 and two arc-shaped separation plates 211 are fixedly connected to the recovery pipe 21. Each of the two arc-shaped separation plates 211 has a vertical rod 218 fixedly connected to its top. The arc-shaped separation plates 211 are fixedly connected to the recovery pipe 21 through the vertical rod 218. An inner diameter detection pin 212 is set between the two separation frames 28. An outer diameter detection pin 210 has an outer diameter detection hole in the middle. The two arc-shaped separation plates 211 are set above the outer diameter detection hole.

[0064] In this embodiment, the specific testing steps for the bushing are as follows:

[0065] S1. In the initial state, the bushing is transported by the conveyor belt 1, so that the bushing moves slowly towards the position of the recovery pipe 21.

[0066] S2. Until the first bushing moves below the detection port 27, the second cylinder 23 drives the inner diameter detection pin 212 to move vertically downwards, causing the traction rope 214 to pull the sealing plate 29 towards a higher horizontal position in the recovery pipe 21, thereby opening the detection port 27 in time. Bushings with the correct inner diameter will pass through the standard detection post 224 and the thin post 223, while the coarse detection post 222 will block the bushing from entering. When the inner diameter detection pin 212 detects a defective product, the bushing with a smaller inner diameter will be stuck on the standard detection post 224 and cannot fall off. The bushing with a larger inner diameter will pass through the standard detection post 224 and the thin post 223 in sequence and be stuck on the coarse detection post 222. This causes the defective product to be carried by the inner diameter detection pin 212 into the recycling pipe 21. The sealing plate 29 slides down under its own weight and seals the detection port 27 again. Then the inner diameter detection pin 212 will continue to move, and the separator 28 will separate the defective product from the diameter detection pin. The defective product falls into the recycling pipe 21 under its own weight and slides out along the inclined pipe wall of the recycling pipe 21 for collection. The detection and recycling of the defective product are completed in one go. It should be noted that the outer diameter detection pin 210 is driven by the first cylinder 22 and moves synchronously with the inner diameter detection pin 212. When the inner diameter detection pin 212 detects the defective product for the first time, the outer diameter detection pin 210 will be in an idle state.

[0067] S3. After the bushing passes the inner diameter detection pin 212, the bushing with a qualified inner diameter will continue to move with the conveyor belt to the outer diameter detection pin 210. Then, the first cylinder 22 is activated, causing its telescopic end to drive the outer diameter detection pin 210 downward, causing the elastic plate 221 to squeeze the bushing. At the same time, the elastic plate 221 deforms itself until it moves to the bottom of the bushing and elastically returns to its original position. At this time, the elastic plate 221 will be inserted into the bottom of the bushing. When the telescopic end of the first cylinder 22 returns to its original position, the bushing with a standard outer diameter will... In the initial stage of the outer diameter detection pin 210 resetting, its own weight squeezes the elastic sheet 221, causing it to deform and fall back onto the conveyor belt 1. The defective bushing with a smaller outer diameter will be lifted by multiple elastic sheets 221. As the outer diameter detection pin 210 resets and enters the recycling pipe 21, after the sealing plate 29 blocks the detection port 27, the outer diameter detection pin 210 will continue to move vertically upward. The arc-shaped separation plate 211 squeezes the defective bushing through the elastic sheet 221 and it falls into the recycling pipe 21. The defective product slides out and is collected along the inclined pipe wall of the recycling pipe 21.

[0068] It should be understood that the above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. It should not be considered that the specific implementation of this utility model is limited to these descriptions. For those skilled in the art to which this utility model pertains, several simple deductions or substitutions can be made without departing from the concept of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the protection scope of this utility model.

Claims

1. A bushing detection mechanism characterized by, The application relates to a liner caliber detection assembly (2) comprising a recovery pipe (21) obliquely arranged on a conveying belt (1), a caliber detection pin vertically slidingly arranged in the recovery pipe (21), a driving member arranged on the recovery pipe (21) and used for driving the caliber detection pin to vertically move, a detection opening (27) arranged in the recovery pipe (21) and used for the caliber detection pin to detect a liner, a blocking plate (29) slidingly arranged on the detection opening (27), a driven member arranged in the recovery pipe (21), the driving member being connected with the blocking plate (29) through the driven member, when the caliber detection pin moves towards the liner, the driven member drags the blocking plate (29) to move to open the detection opening (27), and a separating member arranged in the recovery pipe (21), when the caliber detection pin carries a substandard product to reset, the substandard product is separated by the separating member and slides out along the recovery pipe (21).

2. A bush detection mechanism according to claim 1, characterised in that: The caliber detection pin comprises an inner diameter detection pin (212) and an outer diameter detection pin (210), and the inner diameter detection pin (212) and the outer diameter detection pin (210) are linearly distributed.

3. A bushing detection mechanism according to claim 2, wherein: The driving member comprises a first air cylinder (22) and a second air cylinder (23), the telescopic end of the first air cylinder (22) is connected with the outer diameter detection pin (210), and the telescopic end of the second air cylinder (23) is connected with the inner diameter detection pin (212).

4. The bushing detection mechanism of claim 1, wherein: The driven member comprises a traction rope (214), a pulley block is arranged in the recovery pipe (21), the traction rope (214) is slidingly connected with the pulley block, one end of the traction rope (214) is connected with the caliber detection pin, and the other end of the traction rope (214) is connected with the blocking plate (29).

5. A bushing detection mechanism according to claim 2, wherein: The separating member comprises two separating frames (28) and two arc-shaped separating plates (211), the inner diameter detection pin (212) is arranged between the two separating frames (28), the outer diameter detection pin (210) has an outer diameter detection hole in the middle, and the two arc-shaped separating plates (211) are arranged above the outer diameter detection hole.

6. A bushing detection mechanism according to claim 1, wherein: A sliding groove (25) for the blocking plate (29) to slide is arranged in the recovery pipe (21), the sliding groove (25) forms an included angle with a horizontal plane, the top of the sliding groove is provided with two limiting strips (24), and the blocking plate (29) is arranged between the sliding groove (25) and the limiting strips (24).

7. A bushing detection mechanism according to claim 2, wherein: The outer diameter detection pin (210) is provided with a plurality of elastic sheets (221).

8. A bushing detection mechanism according to claim 2, wherein: The inner diameter detection pin (212) comprises a thick detection column (222), the bottom of the thick detection column (222) is connected with a thin column (223), and the bottom of the thin column (223) is connected with a standard detection column (224).

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