Device and method for detecting foreign matters in inner hole of valve guide pipe

Abstract

The invention discloses an inner hole foreign matter detection device for a valve guide pipe. The inner hole foreign matter detection device comprises a lifting assembly for placing a to-be-detected valve guide pipe; the detection assembly comprises a detection rod, the detection rod is coaxial with the to-be-detected valve guide pipe, the detection rod moving along the axis of the to-be-detected valve guide pipe can be embedded into an inner hole of the to-be-detected valve guide pipe, and when the detection rod is subjected to resistance applied by the inner hole, a detection part can send out a blocking signal. The detection rod is embedded into the inner hole of the to-be-detected valve guide pipe to detect the inner surface of the to-be-detected valve guide pipe, when protrusions such as granular accumulation exist in the inner hole, the protrusions can apply resistance to the end face of the detection rod to limit continuous movement of the detection rod, and then the situation that protrusions exist on the inner surface of the inner hole can be known through the sensor; when the inner hole does not have protrusions such as particle accumulation, the detection rod is coaxial with the inner hole, so that the detection rod is not subjected to resistance, the detection rod can penetrate through the inner hole, the detection accuracy of the inner surface of the inner hole of the valve guide pipe is ensured, and the detection efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of valve guide production, and in particular to a device and method for detecting foreign matter in the inner hole of a valve guide. Background Art

[0002] Powder metallurgy is a material processing technology that uses metal powder as raw material, presses and sintered at high temperature to form solid parts with desired properties. The main steps of sintering valve guides are as follows: mixing metal powders, pressing the powder into a mold, heating the pressed parts to a temperature close to their melting point for sintering, and finishing the sintered valve guides.

[0003] During the sintering process of the valve guide, if the powder particles are too large or the particle size distribution is uneven, it may cause excessive powder accumulation in certain areas during the pressing process, and fail to fully fuse during the sintering process, forming granular accumulation, causing protrusions on the inner surface of the inner hole of the valve guide. When the finishing tool encounters the protrusion, it will impact it, causing the tool to break and cause a processing accident. Summary of the invention

[0004] The present invention solves the problem of detecting the inner surface of the inner hole of the valve guide after being pressed and formed, and provides a device and method for detecting foreign matter in the inner hole of the valve guide. The specific technical scheme is as follows:

[0005] A device for detecting foreign matter in the inner hole of a valve guide comprises: a lifting assembly for placing the valve guide to be detected; and a detection assembly, the detection assembly comprising a detection rod, the detection rod being coaxial with the valve guide to be detected, the detection rod moving along the axis of the valve guide to be detected can be embedded in the inner hole of the valve guide to be detected, and when the detection rod is subjected to resistance applied by the inner hole, a detection part of the detection assembly for detecting the detection rod can send a blocked signal.

[0006] Furthermore, the detection assembly includes a detection bracket, on which a detection rod is arranged. The detection bracket drives the detection rod to continuously embed into the inner hole of the valve guide to be detected. When the detection rod is subjected to resistance applied by the inner hole, the detection rod applies pressure or relative movement to the detection bracket to generate an obstruction signal.

[0007] Preferably, the detection rod is slidably connected to the detection bracket, and the detection assembly also includes an infrared sensor. When the detection rod is subjected to resistance applied by the inner hole, the detection bracket continues to approach the valve guide to be detected, the detection rod and the valve guide to be detected are fixed, the detection rod moves relative to the detection bracket and applies pressure to the detection bracket, and the infrared sensor can detect the relative movement of the detection rod and the detection bracket and generate an obstruction signal.

[0008] Preferably, the detection assembly further comprises a spring arranged on a side of the detection rod, wherein the spring is arranged between the detection rod and the detection bracket, and when the detection rod moves relative to the detection bracket, the spring is compressed to apply elastic force to the detection rod.

[0009] Preferably, the detection assembly further comprises a pressure sensor arranged at one end of the detection rod away from the inner hole. When the detection rod is subjected to resistance exerted by the inner hole, the resistance exerted on the detection rod is transmitted to the pressure sensor, and the pressure sensor generates a blocked signal.

[0010] Preferably, the detection component also includes: a detection cylinder that pushes the detection bracket to move, the extension and retraction direction of the detection cylinder is the same as the movement direction of the detection rod; a connecting block arranged on the side of the detection rod, the connecting block can limit the movement distance of the detection rod relative to the detection bracket; and a first guide rail slidably connected to the connecting block, the length direction of the first guide rail is parallel to the axial direction of the detection rod, and the first guide rail is fixedly connected to the detection bracket.

[0011] Preferably, the lifting assembly includes: a lifting machine, which can lift the valve catheter to be tested; a support plate arranged on the lifting mechanism of the lifting machine, the support plate being formed with a catheter placement groove for placing the valve catheter to be tested, the length direction of the catheter placement groove is parallel to the axial direction of the valve catheter to be tested, and the axis of the valve catheter to be tested placed on the catheter placement groove can coincide with the axis of the detection rod.

[0012] Preferably, it also includes a limit assembly, which includes: a limit bracket, which is arranged on the side of the valve guide to be tested; at least two positioning cylinders arranged on the limit bracket, and the moving direction of the positioning cylinder is parallel to the axial direction of the valve guide to be tested; at least two positioning baffles arranged on the telescopic ends of the positioning cylinders, the length direction of the positioning baffles is perpendicular to the axial direction of the detection rod, and the projection of the positioning baffles in the axial direction perpendicular to the detection rod can completely cover the projection of the valve guide to be tested in this direction; the positioning cylinder can drive the positioning baffles to apply pressure to the two end surfaces of the valve guide to be tested, thereby limiting the valve guide to be tested from being immobile relative to the lifting assembly.

[0013] The detection method comprises the following steps:

[0014] S1: The lifting machine lifts the support plate so that the valve guides to be tested placed thereon are all coaxial with the testing rod;

[0015] S2: The positioning cylinder drives the positioning baffle to limit the movement of the valve guide to be tested;

[0016] S3: The detection cylinder drives the detection bracket and then drives the detection rod to be embedded in the inner hole of the valve guide to be detected, and determines whether there are protrusions such as granular accumulation on the inner surface of the inner hole of the valve guide to be detected according to whether the infrared sensor or the pressure sensor generates a blocking signal.

[0017] Preferably, in S3, the diameter of the detection rod is 0.01 mm smaller than the inner diameter of the inner hole of the valve conduit to be detected. When there is no granular accumulation on the inner surface of the inner hole of the valve conduit to be detected, the detection rod passes through the inner hole smoothly; when there is granular accumulation on the inner surface of the inner hole of the valve conduit to be detected, the detection rod encounters resistance that hinders its forward movement, and the resistance is transmitted to the infrared sensor or the pressure sensor to generate a blocked signal.

[0018] It can be seen from the above technical solution that the present invention has the following beneficial effects:

[0019] The present invention detects the inner surface of the valve guide to be detected by arranging a detection rod to be embedded in the inner hole of the valve guide to be detected. When there are protrusions such as granular accumulations in the inner hole, the protrusions can exert resistance on the end face of the detection rod to restrict its continued movement, and then the sensor can know that there is a protrusion on the inner surface of the inner hole; when there are no protrusions such as granular accumulations in the inner hole, the detection rod is coaxial with the inner hole to ensure that the detection rod will not be subject to resistance, and then the detection rod can pass through the inner hole, thereby ensuring the detection accuracy of the inner surface of the inner hole of the valve guide, improving the detection efficiency, and ensuring that the subsequent fine processing tool will not have a knife hit or chipping accident. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a structural diagram of the first embodiment of the present invention without a lifting component;

[0021] Figure 2 for Figure 1 A front view of

[0022] Figure 3 for Figure 1 Side view of

[0023] Figure 4 for Figure 1 A top view of

[0024] Figure 5 Schematic diagram of the lifting assembly structure of the first embodiment of the present invention

[0025] In the figure: 1. detection component; 2. lifting component; 3. limit component; 4. valve guide to be detected; 11. detection cylinder; 12. detection bracket; 13. detection rod; 14. connecting block; 15. spring; 16. first guide rail; 17. infrared sensor; 18. pressure sensor; 21. lifting machine; 23. support plate; 24. guide tube placement groove; 31. limit bracket; 32. positioning cylinder; 33. positioning baffle. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] In the description of the embodiments of the present invention, it should be noted that the terms "inside", "outside", "upper", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0028] The movement direction of the detection component toward the lifting component is considered to be forward, and the opposite direction is considered to be backward.

[0029] Embodiment 1

[0030] like Figures 1 to 4 As shown, the present invention includes: a lifting assembly 2 for placing a valve guide 4 to be detected; and a detection assembly 1, wherein the detection assembly 1 includes a detection rod 13, wherein the detection rod 13 is coaxial with the valve guide 4 to be detected, and the detection rod 13 moves along the axis of the valve guide 4 to be detected and gradually embeds into the inner hole of the valve guide 4 to be detected. When the detection rod 13 is subjected to resistance applied by the inner hole, the detection part of the detection assembly 1 for detecting the detection rod 13 can send a blocked signal.

[0031] Specifically, the lifting component 2 lifts the height of the valve guide 4 to be inspected so that it is flush with the height of the inspection rod 13, so that the inspection rod 13 is coaxial with the valve guide 4 to be inspected, and then the inspection rod 13 can move along its axis under the action of thrust. In actual production, the diameter of the inspection rod 13 is generally 0.01 mm smaller than the inner hole diameter of the valve guide 4 to be inspected, so that the inspection rod 13 can be embedded in the inner hole, and can be subjected to the resistance exerted by the accumulation when granular accumulation appears in the inner hole, thereby blocking the inspection rod 13 from continuing to move. At this time, the detection part in the detection component 1 judges the movement state of the detection rod 13 and then sends a blocked signal, reminding the operator that there is a valve guide 4 to be inspected with granular accumulation in the inner hole, which is convenient for the operator or the subsequent rejection mechanism to reject it, and prevent it from entering the subsequent finishing process and causing damage to the machining tool.

[0032] Furthermore, the detection assembly 1 includes a detection bracket 12, and a detection rod 13 is arranged on the detection bracket 12. The detection bracket 12 drives the detection rod 13 to continuously embed into the inner hole of the valve guide 4 to be detected. When the detection rod 13 is subjected to the resistance applied by the inner hole, the detection rod 13 applies pressure to the detection bracket 12 or moves relative to it to generate an obstruction signal.

[0033] Specifically, multiple detection rods 13 with parallel axes are connected to the detection bracket 12 by fixed connection or sliding connection. The detection bracket 12 drives the detection rod 13 to move toward the inner hole of the valve guide 4 to be detected. When the detection rod 13 is slidingly connected to the detection bracket 12, the detection rod 13 is subjected to the resistance applied by the inner hole, and the detection bracket 12 will continue to move, so that the detection rod 13 and the detection bracket 12 move relative to each other. The detection part of the detection component 1 detects the relative movement and generates a blocked signal; when the detection rod 13 is fixedly connected to the detection bracket 12, the detection rod 13 is subjected to the resistance applied by the inner hole, and the detection bracket 12 is also subjected to the same pressure. The detection part of the detection component 1 detects that the detection bracket 12 is subjected to pressure and generates a blocked signal, thereby enabling the detection rod 13 to detect whether there is granular accumulation in the inner hole of the valve guide 4 to be detected.

[0034] Furthermore, an embodiment of the sliding connection between the detection rod 13 and the detection bracket 12 is as follows: the detection assembly 1 also includes an infrared sensor 17. When the detection rod 13 is subjected to the resistance applied by the inner hole, the detection bracket 12 continues to approach the valve guide 4 to be detected, the detection rod 13 and the valve guide 4 to be detected are fixed, the detection rod 13 moves relative to the detection bracket 12 and applies pressure to the detection bracket 12, and the infrared sensor 17 can detect the relative movement between the detection rod 13 and the detection bracket 12 and generate an obstruction signal.

[0035] Specifically, when the detection bracket 12 drives the detection rod 13 to embed into the inner hole of the valve guide 4 to be detected, when the detection rod 13 encounters the resistance of the inner hole and cannot continue to move, the detection bracket 12 continues to move. When the moving direction of the detection bracket 12 is taken as the front, the detection rod 13 will move backward relative to the detection bracket 12, so that the end of the detection rod 13 moves in the detection bracket 12, and then the infrared sensor 17 fixed on the detection bracket 12 can detect that the end of the detection rod 13 moves in the detection bracket 12. The infrared sensor 17 therefore generates a blocked signal, thereby reminding the operator to deal with it.

[0036] Furthermore, the detection assembly 1 also includes a spring 15 arranged on the side of the detection rod 13 , and the spring 15 is arranged between the detection rod 13 and the detection bracket 12 . When the detection rod 13 moves relative to the detection bracket 12 , the spring 15 is compressed to apply elastic force to the detection rod 13 .

[0037] Specifically, the spring 15 is sleeved on the axial side of the detection rod 13, and the two ends of the spring 15 are respectively connected to the detection rod 13 and the detection bracket 12. When the detection rod 13 moves backward relative to the detection bracket 12, the spring 15 is compressed and exerts elastic force on both the detection rod 13 and the detection bracket 12. When the contact portion between the detection bracket 12 and the spring 15 is provided with a pressure sensor 18, a blocking signal can also be generated. After the detection rod 13 and the detection bracket 12 complete the detection, the detection rod 13 can return to the initial position under the action of the compressed spring 15, and the inner hole of the valve guide 4 to be detected is repeatedly detected, avoiding the operator from resetting it, thereby improving the detection efficiency.

[0038] Furthermore, the detection component 1 also includes: a detection cylinder 11 that pushes the detection bracket 12 to move, and the extension and retraction direction of the detection cylinder 11 is the same as the moving direction of the detection rod 13; a connecting block 14 arranged on the side of the detection rod 13, and the connecting block 14 can limit the moving distance of the detection rod 13 relative to the detection bracket 12; and a first guide rail 16 slidably connected to the connecting block 14, and the length direction of the first guide rail 16 is parallel to the axial direction of the detection rod 13, and the first guide rail 16 is fixedly connected to the detection bracket 12.

[0039] Specifically, the telescopic end of the detection cylinder 11 is fixedly connected to the detection bracket 12, which can push the detection bracket 12 to drive the detection rod 13 to move forward. When the detection rod 13 is blocked and fixed, the detection bracket 12 can also continue to move forward; secondly, the front end of the detection rod 13 is fixedly connected to a connecting block 14, and the connecting block 14 is tightly attached to the front end of the detection bracket 12 under the action of the elastic force of the spring 15. When the detection rod 13 is pressed to move backward, the connecting block 14 can limit the detection rod 13 from separating from the rear end of the detection bracket 12. When the detection rod 13 is subjected to the elastic force and moves forward, the connecting block 14 can limit the detection rod 13 from separating from the front end of the detection bracket 12 , and then the movement range of the detection rod 13 is limited between the front and rear ends of the detection bracket 12, so that the detection rod 13 can repeatedly detect the inner hole of the valve guide 4 to be detected; secondly, the first guide rail 16 is fixedly connected to the detection bracket 12, and it is slidably connected to the connecting block 14, so that the movement trajectory of the connecting block 14 always coincides with the axis of the valve guide 4 to be detected, so that the detection rod 13 is always coaxial with the valve guide 4 to be detected during the movement, avoiding the occurrence of an angle between the axes of the two, and then applying resistance to the detection rod 13, which interferes with the detection rod 13 to detect whether there is granular accumulation in the inner hole. The coaxiality can improve the detection accuracy.

[0040] The connection method between the detection rod 13 and the detection bracket 12 is an embodiment of a fixed connection: the detection component 1 also includes a pressure sensor 18 arranged at an end of the detection rod 13 away from the inner hole. When the detection rod 13 is subjected to resistance applied by the inner hole, the resistance exerted on the detection rod 13 is transmitted to the pressure sensor 18, and the pressure sensor 18 generates a blocked signal.

[0041] Specifically, the detection bracket 12 drives the detection rod 13 to move forward. When the inner hole of the valve guide 4 to be detected limits the detection rod 13 from continuing to move forward, resistance is applied to it. The resistance is transmitted to the detection bracket 12 through the detection rod 13, so that the detection rod 13 applies pressure to the detection bracket 12 at this time, and then the pressure sensor 18 arranged at the connection position between the rear end of the detection rod 13 and the detection bracket 12 can detect the pressure, and then generate a blockage signal, thereby reminding the operator to remove the problematic valve guide.

[0042] like Figure 5 As shown, the lifting assembly 2 includes: a lifting machine 21, which can lift the valve guide 4 to be tested; a support plate 23 arranged on the lifting mechanism of the lifting machine 21, and the support plate 23 is formed with a guide placement groove 24 for placing the valve guide 4 to be tested, and the length direction of the guide placement groove 24 is parallel to the axial direction of the valve guide 4 to be tested, and the axis of the valve guide 4 to be tested placed on the guide placement groove 24 can coincide with the axis of the detection rod 13.

[0043] Specifically, the lifting machine 21 is driven by a servo motor to drive a screw rod to realize the lifting function, and can also be realized by a cylinder with a large stroke. Its lifting direction is perpendicular to the plane formed by the axis of the valve guide 4 to be detected, so that when the lifting machine 21 lifts the support plate 23 and then lifts the valve guide 4 to be detected, the plane formed by the axis of the valve guide 4 to be detected is always in parallel movement, so that when the axis of one valve guide 4 to be detected coincides with the axis of the detection rod 13, the axes of all the valve guides 4 to be detected coincide with the axis of the detection rod 13, thereby improving the accuracy of detection; secondly, the guide tube placement groove 24 is a V-shaped groove, so that the valve guide 4 to be detected is automatically centered when placed thereon, so that the position of its axis is fixed, so that when the lifting machine 21 repeatedly lifts the guide tube placement groove 24, the movement trajectory of the axis of the valve guide 4 to be detected is the same, thereby increasing the probability that the detection rod 13 is coaxial with the valve guide 4 to be detected during repeated detection, thereby improving the detection efficiency.

[0044] Furthermore, embodiment 1 also includes a limit assembly 3, which includes: a limit bracket 31, which is arranged on the side of the valve guide 4 to be detected; at least two positioning cylinders 32 arranged on the limit bracket 31, and the moving direction of the positioning cylinder 32 is parallel to the axial direction of the valve guide 4 to be detected; at least two positioning baffles 33 arranged on the telescopic ends of the positioning cylinders 32, and the length direction of the positioning baffles 33 is perpendicular to the axial direction of the detection rod 13, and the projection of the positioning baffles 33 in the axial direction perpendicular to the detection rod 13 can completely cover the projection of the valve guide 4 to be detected in this direction; the positioning cylinder 32 can drive the positioning baffles 33 to apply pressure to the two end surfaces of the valve guide 4 to be detected, thereby limiting the valve guide 4 to be detected from being immobile relative to the lifting assembly 2.

[0045] Specifically, the limit bracket 31 is an installation bracket, which is fixedly connected to the detection component 1, the limit bracket 3 and the lifting component 2 so that their relative positions remain unchanged, so that the first embodiment can repeatedly detect the valve guide 4 to be detected; the limit bracket 31 is fixed on both sides of the guide placement groove 24, so that the valve guide 4 to be detected is between the limit brackets 31, and secondly, the two positioning cylinders 32 respectively fixed on the limit brackets 31 are clamping claw cylinders, and their telescopic direction is central contraction, so that the positioning baffle 33 fixedly connected to the telescopic end of the positioning cylinder 32 can be relatively close under the drive of the positioning cylinder 32, and then the positioning baffles 33 arranged at both ends of the valve guide 4 to be detected can contact the two end surfaces of the valve guide 4 to be detected under the drive of the positioning cylinder 32, thereby limiting its axial movement, and then when the detection rod 13 is embedded in the inner hole, when there is granular accumulation in the inner hole, the inner hole can apply resistance to the detection rod 13 without position movement, thereby ensuring the detection result.

[0046] Embodiment 2

[0047] The steps of the detection method according to the first embodiment are as follows:

[0048] S1: The lifting machine 21 lifts the support plate 23 so that the valve guides 4 to be tested placed thereon are all coaxial with the testing rod 13;

[0049] Specifically, after the valve conduit 4 to be inspected is placed in the conduit placement groove 24 in the support plate 23, the lifting machine 21 raises its height so that its axis is the same as the axis of the detection rod 13, so that when the detection rod 13 moves forward, it can be embedded in the inner hole of the valve conduit 4 to be inspected and its inner hole can be inspected.

[0050] S2: The positioning cylinder 32 drives the positioning baffle 33 to limit the movement of the valve guide 4 to be tested;

[0051] Specifically, the length of the positioning baffle 33 is not less than the total length of the end faces of all the valve guides 4 to be tested, so that when the positioning cylinder 32 drives the positioning baffle 33 to clamp the two ends of the valve guides 4 to be tested, the positioning baffle 33 can contact the end faces of the valve guides 4 to be tested and apply pressure to them, so that they can all be fixed relative to the limiting bracket 31, so that the detection rod 13 can be subjected to the resistance applied to it by the inner hole of the valve guide 4 to be tested.

[0052] S3: The detection cylinder 11 drives the detection bracket 12 and then drives the detection rod 13 to be embedded in the inner hole of the valve guide 4 to be detected, and determines whether there are protrusions such as granular accumulation on the inner surface of the inner hole of the valve guide 4 to be detected according to whether the infrared sensor 17 or the pressure sensor 18 generates a blocking signal.

[0053] Specifically, the diameter of the inner surface of the inner hole is only 0.01 mm larger than the diameter of the detection rod 13, so that once there is granular accumulation in the inner hole, the fixed inner hole can apply resistance to the end face of the detection rod 13 through the granular accumulation, thereby causing the detection rod 13 to move relative to the detection bracket 12 or apply pressure, so that the infrared sensor 17 detects the relative movement and the pressure sensor 18 detects the pressure to generate a blocked signal to alert the operator.

[0054] Furthermore, in S3, when there is no granular accumulation on the inner surface of the inner hole of the valve guide 4 to be detected, the detection rod 13 passes through the inner hole smoothly; when there is granular accumulation on the inner surface of the inner hole of the valve guide 4 to be detected, the detection rod 13 encounters resistance that hinders its forward movement, and the resistance is transmitted to the infrared sensor 17 or the pressure sensor 18 to generate a blocked signal.

[0055] Specifically, when there are no protrusions such as granular accumulation on the inner surface of the inner hole, because the detection rod 13 is coaxial with the valve guide 4 to be detected, it will not contact the inner surface of the inner hole, and thus it can pass through the inner hole without resistance; when there are protrusions such as granular accumulation on the inner surface of the inner hole, because the diameter of the detection rod 13 is only 0.01mm smaller than the diameter of the inner surface of the inner hole, any protrusion not less than 0.01mm can exert resistance on the end face of the detection rod 13, restricting its movement, and protrusions less than 0.01mm will not cause damage to the subsequent finishing tool. The detection rod 13 is blocked, so that the infrared sensor 17 or the pressure sensor 18 receives a signal and generates a blocked signal.

[0056] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

[0057] The techniques, shapes, and structural parts not described in detail in the present invention are all well-known techniques.

Claims

1. A device for detecting foreign matter in the inner hole of a valve guide, It is characterized in that include: A lifting assembly (2) is placed on which a valve guide (4) to be inspected is placed; as well as A detection assembly (1), the detection assembly (1) comprising a detection rod (13), the detection rod (13) being coaxial with a valve guide (4) to be detected, the detection rod (13) moving along the axis of the valve guide (4) to be detected being able to be embedded in the inner hole of the valve guide (4) to be detected, and when the detection rod (13) is subjected to resistance applied by the inner hole, a detection portion of the detection assembly (1) for detecting the detection rod (13) can emit a blocked signal.

2. The inner hole foreign body detection device according to claim 1, Features: The detection assembly (1) comprises a detection bracket (12), the detection rod (13) being arranged on the detection bracket (12), the detection bracket (12) driving the detection rod (13) to continuously embed into the inner hole of the valve guide (4) to be detected, and when the detection rod (13) is subjected to resistance applied by the inner hole, the detection rod (13) applies pressure to the detection bracket (12) or relatively moves to generate a resistance signal.

3. The inner hole foreign body detection device according to claim 2, Features: The detection rod (13) is slidably connected to the detection bracket (12); the detection assembly (1) further comprises an infrared sensor (17); when the detection rod (13) is subjected to resistance exerted by the inner hole, the detection bracket (12) continues to approach the valve guide (4) to be detected; the detection rod (13) and the valve guide (4) to be detected are fixed to each other; the detection rod (13) moves relative to the detection bracket (12) and applies pressure to the detection bracket (12); the infrared sensor (17) can detect the relative movement between the detection rod (13) and the detection bracket (12) and generate a blocked signal.

4. The inner hole foreign body detection device according to claim 3, Features: The detection assembly (1) further comprises a spring (15) arranged on a side of the detection rod (13); the spring (15) is arranged between the detection rod (13) and the detection bracket (12); when the detection rod (13) moves relative to the detection bracket (12), the spring (15) is compressed to apply elastic force to the detection rod (13).

5. The inner hole foreign body detection device according to claim 2, Features: The detection assembly (1) further comprises a pressure sensor (18) arranged at one end of the detection rod (13) away from the inner hole. When the detection rod (13) is subjected to resistance exerted by the inner hole, the resistance exerted on the detection rod (13) is transmitted to the pressure sensor (18), and the pressure sensor (18) generates a resistance signal.

6. The inner hole foreign body detection device according to claim 2, Features: The detection component (1) further comprises: A detection cylinder (11) that pushes the detection bracket (12) to move, wherein the extension and retraction direction of the detection cylinder (11) is the same as the moving direction of the detection rod (13); a connecting block (14) arranged on a side of the detection rod (13), the connecting block (14) being capable of limiting a moving distance of the detection rod (13) relative to the detection bracket (12); and A first guide rail (16) is slidably connected to the connection block (14), the length direction of the first guide rail (16) is parallel to the axial direction of the detection rod (13), and the first guide rail (16) is fixedly connected to the detection bracket (12).

7. The inner hole foreign body detection device according to claim 1, Features: The lifting assembly (2) comprises: A lifting machine (21), the lifting machine (21) being capable of lifting and lowering the valve guide (4) to be inspected; A support plate (23) is arranged on the lifting mechanism of the lifting machine (21), and the support plate (23) is formed with a catheter placement groove (24) for placing the valve catheter (4) to be tested, and the length direction of the catheter placement groove (24) is parallel to the axial direction of the valve catheter (4) to be tested, and the axis of the valve catheter (4) to be tested placed on the catheter placement groove (24) can coincide with the axis of the detection rod (13).

8. The inner hole foreign body detection device according to claim 1, Features: It also includes a limiting component (3), which includes: A limiting bracket (31), the limiting bracket (31) being arranged on a side of the valve guide (4) to be tested; At least two positioning cylinders (32) are arranged on the limiting bracket (31), and the moving direction of the positioning cylinders (32) is parallel to the axial direction of the valve guide (4) to be detected; At least two positioning baffles (33) are arranged on the telescopic end of the positioning cylinder (32), the length direction of the positioning baffles (33) is perpendicular to the axial direction of the detection rod (13), and the projection of the positioning baffles (33) in the direction perpendicular to the axial direction of the detection rod (13) can completely cover the projection of the valve guide (4) to be detected in this direction; The positioning cylinder (32) can drive the positioning baffle (33) to apply pressure to the two end surfaces of the valve guide (4) to be tested, thereby limiting the valve guide (4) to be tested to remain motionless relative to the lifting assembly (2).

9. The detection method according to any one of claims 1 to 8, It is characterized in that The steps include: S1: The lifting machine (21) lifts the support plate (23) so that the valve guides (4) to be tested placed thereon are all coaxial with the testing rod (13); S2: The positioning cylinder (32) drives the positioning baffle (33) to limit the movement of the valve guide (4) to be tested; S3: The detection cylinder (11) drives the detection bracket (12) and further drives the detection rod (13) to be embedded in the inner hole of the valve guide (4) to be detected, and determines whether there are protrusions such as granular accumulation on the inner surface of the inner hole of the valve guide (4) to be detected according to whether the infrared sensor (17) or the pressure sensor (18) generates a blocking signal.

10. The detection method according to claim 9, Features: In S3, the diameter of the detection rod (13) is 0.01 mm smaller than the inner diameter of the inner hole of the valve guide (4) to be detected. When there is no granular accumulation on the inner surface of the inner hole of the valve guide (4) to be detected, the detection rod (13) passes through the inner hole smoothly; when there is granular accumulation on the inner surface of the inner hole of the valve guide (4) to be detected, the detection rod (13) encounters resistance that hinders its forward movement, and the resistance is transmitted to the infrared sensor (17) or the pressure sensor (18) to generate a blocked signal.

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