Conical flaw detection device for polyurethane sieve plate

Abstract

The invention belongs to the technical field of detection, and discloses a conical flaw detection device for a polyurethane sieve plate, which comprises a flaw detection outer cylinder assembly, and a flaw detection inner rod assembly for performing physical penetration flaw detection on the polyurethane sieve plate is slidably arranged in the flaw detection outer cylinder assembly; the flaw detection inner rod assembly for performing physical piercing flaw detection on the polyurethane sieve plate is slidably arranged in the flaw detection outer cylinder assembly, the conical inner rod slides downwards in the outer cylinder, so that the bottom of the conical inner rod physically pierces into the polyurethane sieve plate, and the conical depth or piercing resistance is recorded as a basis for judging the oxidation degree of the sieve plate; if the conical tip is easy to pierce and the depth is large, the sieve plate is severely oxidized, the hardness is reduced, and the use requirement is not met, and if the conical tip is difficult to pierce and the depth is small, the sieve plate still keeps good performance and can be continuously used, and the piercing amount of the flaw detection inner rod assembly during flaw detection piercing is locked and fixed through the locking assembly; and the position locking of the flaw detection inner rod assembly in the flaw detection outer cylinder assembly is realized.

Description

Technical Field

[0001] This invention belongs to the field of detection technology, specifically relating to a conical flaw detection device for polyurethane sieve plates. Background Technology

[0002] Polyurethane screen plates are widely used in coal preparation plants for screening operations due to their advantages such as high wear resistance, corrosion resistance, high screening efficiency, vibration absorption and noise reduction, and convenient installation and maintenance. However, during long-term contact with air, polyurethane materials undergo oxidative degradation reactions with oxygen, leading to molecular chain breakage and a decline in physical properties, which seriously affects the service life of the screen plates.

[0003] In actual production, the sieve plate vibrates at high frequency with the sieve body. If its internal hardness decreases and its structure becomes loose due to oxidation, the sieve plate is easily damaged or even falls off, affecting normal production. Currently, there is a lack of effective on-site detection methods for the oxidation degree of polyurethane sieve plates. Traditional chemical analysis methods are not only costly and time-consuming, but also cause irreversible damage to the sieve plate, making them difficult to promote and apply in actual production. Existing electronic instruments are also unable to accurately and quickly determine the oxidation degree of polyurethane materials.

[0004] Therefore, there is an urgent need for a physical flaw detection device that is easy to operate, low in cost, and can quickly determine the degree of oxidation of polyurethane screen plates on-site, so as to ensure the normal use of screen plates and the continuous and stable production. Summary of the Invention

[0005] To address the problems mentioned in the background section, this invention provides a conical flaw detection device for polyurethane sieve plates, which is characterized by low cost.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a conical flaw detection device for polyurethane screen plates, comprising a flaw detection outer cylinder assembly, an inner flaw detection rod assembly for physically penetrating and flaw detecting the polyurethane screen plate is slidably disposed inside the outer cylinder assembly, and a drive arm assembly is rotatably disposed on one side of the outer cylinder assembly. A force-applying arm assembly is sleeved on the top of the outer cylinder assembly. The drive arm assembly is used to reset the inner flaw detection rod assembly before flaw detection penetration, and the force-applying arm assembly is used to apply force to the inner flaw detection rod assembly during flaw detection penetration. A locking assembly is disposed on one side of the drive arm assembly to lock and fix the penetration amount of the inner flaw detection rod assembly during flaw detection penetration.

[0007] In a preferred embodiment of a conical flaw detection device for polyurethane sieve plates, the flaw detection outer cylinder assembly includes an outer cylinder and an outer frame. A top cap platform is fixedly installed on the top of the outer cylinder, and side sliding grooves are provided on both sides of the outer cylinder. The outer frame is fixedly installed on the outer wall of the outer cylinder. An L-shaped support arm is fixedly installed on the bottom outer wall of the outer cylinder, and a roller is fixedly installed at the bottom of the L-shaped support arm. An end groove is opened on the middle outer wall of the outer cylinder. A handle and a side frame groove are provided on the outer frame, and a side end arm is provided on the outside of the end groove.

[0008] In a preferred embodiment of a conical flaw detection device for polyurethane sieve plates, the flaw detection inner rod assembly includes a conical inner rod, on which an inner rod groove is formed, and a toothed toothed plate is fixedly arranged inside the inner rod groove.

[0009] In a preferred embodiment of a conical flaw detection device for polyurethane sieve plates, the drive arm assembly includes a drive shaft, with a drive gear and a positioning gear ring fixedly mounted at both ends of the drive shaft, and a toggle gear fixedly mounted in the middle of the drive shaft, with a toggle handle fixedly mounted on the toggle gear.

[0010] In a preferred embodiment of a conical flaw detection device for polyurethane sieve plates, the force-applying arm assembly includes a force-applying toothed arm, a toothed arm top ring platform is fixedly provided at the top of the force-applying toothed arm, a ring platform protrusion is fixedly provided on the inner wall of the toothed arm top ring platform, and a ring platform spring is fixedly provided at the top of the toothed arm top ring platform.

[0011] In a preferred embodiment of a conical flaw detection device for polyurethane sieve plates, the locking assembly includes a locking rod, with a locking ball head and a locking toothed ring fixedly disposed at both ends of the locking rod, and a locking spring sleeved on the locking rod.

[0012] In a preferred embodiment of a conical flaw detection device for polyurethane sieve plates, the conical inner rod slides up and down inside the outer cylinder, the toothed toothed plate faces the end groove, the drive shaft is rotatably mounted on the side end arm, at this time the actuating gear meshes with the toothed toothed plate through the end groove, the positioning toothed ring faces the side frame groove, and the drive gear faces the side away from the side frame groove.

[0013] In a preferred embodiment of a conical flaw detection device for polyurethane sieve plates, the toothed arm top ring platform is sleeved on the outside of the outer cylinder. At this time, the ring platform protrusion slides up and down in the side sliding groove. The force-applying toothed arm is located inside the drive gear, and the force-applying toothed arm meshes with the drive gear. The top of the ring platform spring is fixed against the bottom of the top cap platform, and the bottom of the ring platform spring is fixedly set on the toothed arm top ring platform. Through the abutment of the ring platform spring, the toothed arm top ring platform is in a downward structure on the outer cylinder.

[0014] In a preferred embodiment of a conical flaw detection device for polyurethane sieve plates, the locking rod slides through the side frame groove and the outer frame. At this time, the locking tooth ring and the locking spring are located inside the outer frame, the locking ball head is located outside the outer frame, and the two ends of the locking spring abut against the inner wall of the outer frame and the locking tooth ring, respectively.

[0015] In a preferred embodiment of a conical flaw detection device for polyurethane screen plates, the locking tooth ring and the positioning tooth ring are arranged opposite each other. By the pushing of the locking tooth ring by the locking spring, the locking tooth ring and the positioning tooth ring are pushed and engaged. Through the pushing and engaging of the locking tooth ring and the positioning tooth ring, the rotation of the drive arm assembly is locked by the locking assembly.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. The outer cylinder assembly of this invention has an inner rod assembly for physical penetration testing of a polyurethane screen plate. The inner rod slides downward within the outer cylinder, allowing its bottom to physically penetrate the polyurethane screen plate. The penetration depth or resistance is recorded as a basis for judging the degree of oxidation of the screen plate. If the tip of the rod penetrates easily and to a greater depth, it indicates that the screen plate is severely oxidized and its hardness has decreased, no longer meeting the usage requirements. If penetration is difficult and the depth is shallow, it indicates that the screen plate still maintains good performance and can continue to be used.

[0017] 2. The outer cylinder assembly of the present invention is rotatably equipped with a drive arm assembly on one side, and a force-applying arm assembly is sleeved on the top of the outer cylinder assembly. The drive arm assembly is used to reset the inner rod assembly before the flaw detection insertion, and the force-applying arm assembly is used to apply force to the inner rod assembly during flaw detection insertion. The drive shaft drives the conical inner rod to slide rapidly down inside the outer cylinder through the actuating gear and the toothed plate, thereby achieving the force-applying drive for each cone insertion of the inner rod assembly. The actuating gear drives the conical inner rod to move upward inside the outer cylinder through the toothed plate, thereby resetting the inner rod assembly each time it is cone inserted, preparing for the next cone insertion flaw detection action.

[0018] 3. A locking component is provided on one side of the drive arm assembly of the present invention. The locking component locks and fixes the insertion amount of the inner rod assembly during flaw detection. The locking tooth ring meshes with the positioning tooth ring through the pushing force of the locking spring. Through the meshing of the locking tooth ring and the positioning tooth ring, the drive arm assembly is fixed in the outer frame, that is, it cannot rotate. In this way, the actuating gear is fixed. At this time, the fixed actuating gear fixes the conical inner rod in the position of the outer cylinder through the toothed tooth plate, thereby locking the position of the inner rod assembly of the flaw detection assembly inside the outer cylinder assembly. Attached Figure Description

[0019] Figure 1 This is a perspective view of the present invention; Figure 2 This is a cross-sectional view of the present invention; Figure 3 This is a perspective view of the flaw detection outer cylinder assembly of the present invention; Figure 4 This is a perspective view of the flaw detection inner rod assembly of the present invention; Figure 5 This is a perspective view of the drive arm assembly of the present invention; Figure 6 This is a perspective view of the lever arm assembly of the present invention; Figure 7 This is a perspective view of the locking component of the present invention.

[0020] In the diagram: 100, Flaw Detection Outer Cylinder Assembly; 101, Outer Cylinder; 102, Side Slide Groove; 103, End Groove; 104, Outer Frame; 105, L-shaped Support Arm; 106, Roller; 107, Handle; 108, Side End Arm; 109, Side Frame Groove; 110, Top Cap Platform; 200, Flaw Detection Inner Rod Assembly; 201, Conical Inner Rod; 202, Inner Rod Groove; 203, Gear Plate; 300, Drive Arm Assembly 301. Drive shaft; 302. Drive gear; 303. Actuating gear; 304. Positioning gear ring; 305. Actuating handle; 400. Force arm assembly; 401. Force arm; 402. Gear arm top ring platform; 403. Ring platform protrusion; 404. Ring platform spring; 500. Locking assembly; 501. Locking rod; 502. Locking spring; 503. Locking gear ring; 504. Locking ball head. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Please see Figures 1-7 As shown, the present invention provides a conical flaw detection device for polyurethane screens, including a flaw detection outer cylinder assembly 100, a flaw detection inner rod assembly 200 for physical penetration flaw detection of the polyurethane screen is slidably disposed inside the flaw detection outer cylinder assembly 100, a drive arm assembly 300 is rotatably disposed on one side of the flaw detection outer cylinder assembly 100, and a force application arm assembly 400 is sleeved on the top of the flaw detection outer cylinder assembly 100. The drive arm assembly 300 resets the flaw detection inner rod assembly 200 before flaw detection penetration, and the force application arm assembly 400 applies force to the flaw detection inner rod assembly 200 during flaw detection penetration. A locking assembly 500 is disposed on one side of the drive arm assembly 300 to lock and fix the penetration amount of the flaw detection inner rod assembly 200 during flaw detection penetration.

[0023] In a preferred embodiment, please refer to Figure 3 The flaw detection outer cylinder assembly 100 includes an outer cylinder 101 and an outer frame 104. A top cap platform 110 is fixedly installed on the top of the outer cylinder 101, and side sliding grooves 102 are provided on both sides of the outer cylinder 101. The outer frame 104 is fixedly installed on the outer wall of the outer cylinder 101. An L-shaped support arm 105 is fixedly installed on the bottom outer wall of the outer cylinder 101. A roller 106 is fixedly installed at the bottom of the L-shaped support arm 105. An end groove 103 is opened on the middle outer wall of the outer cylinder 101. A handle 107 and a side frame groove 109 are provided on the outer frame 104. A side end arm 108 is provided on the outside of the end groove 103.

[0024] In this embodiment, the drive shaft 301 is rotatably mounted on the side arm 108.

[0025] In this embodiment, the annular protrusion 403 slides up and down within the side groove 102.

[0026] In a preferred embodiment, please refer to Figure 4 The flaw detection inner rod assembly 200 includes a tapered inner rod 201, an inner rod groove 202 is provided on the tapered inner rod 201, and a toothed toothed plate 203 is fixedly provided inside the inner rod groove 202.

[0027] In this embodiment, the tapered inner rod 201 slides up and down inside the outer cylinder 101.

[0028] In this embodiment, the toothed plate 203 faces the end groove 103.

[0029] In a preferred embodiment, please refer to Figure 5 The drive arm assembly 300 includes a drive shaft 301, with a drive gear 302 and a positioning gear ring 304 fixedly installed at both ends of the drive shaft 301, and a toggle gear 303 fixedly installed in the middle of the drive shaft 301, with a toggle handle 305 fixedly installed on the toggle gear 303.

[0030] In this embodiment, the actuating gear 303 meshes with the toothed plate 203 through the end groove 103.

[0031] In this embodiment, the positioning toothed ring 304 faces the side frame groove 109.

[0032] In this embodiment, the drive gear 302 is oriented toward the side away from the side frame slot 109.

[0033] In a preferred embodiment, please refer to Figure 6 The force-applying arm assembly 400 includes a force-applying toothed arm 401, a toothed arm top ring platform 402 fixedly disposed on the top of the force-applying toothed arm 401, a ring platform protrusion 403 fixedly disposed on the inner wall of the toothed arm top ring platform 402, and a ring platform spring 404 fixedly disposed on the top of the toothed arm top ring platform 402.

[0034] In this embodiment, the toothed arm top ring platform 402 is sleeved on the outside of the outer cylinder 101.

[0035] In this embodiment, the force-applying gear arm 401 is located inside the drive gear 302.

[0036] In this embodiment, the force-applying gear 401 meshes with the drive gear 302.

[0037] In this embodiment, the top of the ring spring 404 is fixed against the bottom of the top cap platform 110, and the bottom of the ring spring 404 is fixedly mounted on the top ring platform 402 of the toothed arm.

[0038] In this embodiment, the toothed arm top ring 402 is in a downward position on the outer cylinder 101 due to the abutment of the ring spring 404.

[0039] In a preferred embodiment, please refer to Figure 7 The locking assembly 500 includes a locking rod 501, with a locking ball head 504 and a locking toothed ring 503 fixedly installed at both ends of the locking rod 501, and a locking spring 502 sleeved on the locking rod 501.

[0040] In this embodiment, the locking rod 501 slides through the side frame groove 109 and the outer frame 104.

[0041] In this embodiment, the locking toothed ring 503 and the locking spring 502 are located inside the outer frame 104.

[0042] In this embodiment, the locking ball head 504 is located outside the outer frame 104.

[0043] In this embodiment, the two ends of the locking spring 502 abut against the inner wall of the outer frame 104 and the locking toothed ring 503, respectively.

[0044] In this embodiment, the locking toothed ring 503 and the positioning toothed ring 304 are positioned opposite each other.

[0045] In this embodiment, the locking spring 502 pushes the locking tooth ring 503, and the locking tooth ring 503 engages with the positioning tooth ring 304. Through the pushing engagement of the locking tooth ring 503 and the positioning tooth ring 304, the locking assembly 500 locks the rotation of the drive arm assembly 300.

[0046] The working principle of this invention is as follows: To solve the problem of physical flaw detection during the oxidative degradation of polyurethane screens, the outer cylinder assembly 100 of this invention has an inner rod assembly 200 for physical penetration testing of the polyurethane screen. The conical inner rod 201 slides up and down inside the outer cylinder 101, and the toothed plate 203 faces the end groove 103. In actual use, the conical inner rod 201 slides downward inside the outer cylinder 101, causing the bottom of the conical inner rod 201 to physically penetrate into the polyurethane screen. The penetration depth or penetration resistance is recorded as a basis for judging the degree of oxidation of the screen. If the cone tip easily penetrates and the depth is large, it indicates that the screen is oxidized. The screen plate is severely degraded and its hardness has decreased, no longer meeting the usage requirements. If it is difficult to penetrate and the depth is shallow, it indicates that the screen plate still maintains good performance and can continue to be used. At the same time, in order to ensure that the penetration height of the inner rod assembly 200 is consistent each time it is penetrated, an L-shaped support arm 105 is fixedly provided on the bottom outer wall of the outer cylinder 101 of this invention, and a roller 106 is fixedly provided at the bottom of the L-shaped support arm 105. In actual use, the roller 106 is pressed against the polyurethane screen plate. At this time, the penetration height of the bottom of the inner rod assembly 200 from the polyurethane screen plate is consistent through the support of the L-shaped support arm 105 and the roller 106, which makes it convenient to maintain the same distance each time it is penetrated.

[0047] Based on the above, in order to solve the reset problem of the inner rod assembly 200 during use and the force application problem during each insertion, the present invention provides a drive arm assembly 300 rotatably mounted on one side of the outer cylinder assembly 100, and a force application arm assembly 400 sleeved on the top of the outer cylinder assembly 100. The drive arm assembly 300 is used to reset the inner rod assembly 200 before insertion, and the force application arm assembly 400 is used to apply force to the inner rod assembly 200 during insertion. Specifically, the force application arm assembly 400 includes a force application toothed arm 4. 01. A toothed arm top ring platform 402 is fixedly installed on the top of the force-applying toothed arm 401. A ring platform protrusion 403 is fixedly installed on the inner wall of the toothed arm top ring platform 402, and a ring platform spring 404 is fixedly installed on the top of the toothed arm top ring platform 402. The toothed arm top ring platform 402 is sleeved on the outside of the outer cylinder 101. At this time, the ring platform protrusion 403 slides up and down in the side sliding groove 102. The force-applying toothed arm 401 is located inside the drive gear 302. At this time, the force-applying toothed arm 401 meshes with the drive gear 302. The top of the ring platform spring 404 abuts against and is fixed to the bottom of the top cap platform 110. Furthermore, the bottom of the ring spring 404 is fixedly mounted on the top ring 402 of the toothed arm. Through the resistance of the ring spring 404, the top ring 402 of the toothed arm is in a downward position on the outer cylinder 101. In actual use, the ring spring 404 applies force to the top ring 402 of the toothed arm. At this time, the top ring 402 of the toothed arm drives the force-applying toothed arm 401 to move downward. At this time, the force-applying toothed arm 401 drives the drive shaft 301 to rotate counterclockwise through the drive gear 302. The drive shaft 301 drives the conical inner rod 2 through the actuating gear 303 and the toothed plate 203. 01 slides rapidly down inside the outer cylinder 101. In this way, the force is applied to drive the inner rod assembly 200 during each cone insertion. When the inner rod assembly 200 resets, the handle 305 is pressed down, and the gear 303 rotates clockwise. During the clockwise rotation, the gear 303 drives the conical inner rod 201 to move upward inside the outer cylinder 101 through the gear plate 203. In this way, the inner rod assembly 200 is reset each time it is cone inserted, preparing for the next cone insertion flaw detection action.

[0048] Based on the above, in order to solve the problem of fixing the position of the inner rod assembly 200 during each flaw detection, a locking assembly 500 is provided on one side of the drive arm assembly 300 of the present invention. The locking assembly 500 locks and fixes the insertion amount of the inner rod assembly 200 during flaw detection. The locking assembly 500 includes a locking rod 501, with a locking ball head 504 and a locking toothed ring 503 fixedly provided at both ends of the locking rod 501, and a locking spring 502 is sleeved on the locking rod 501. In actual use, the locking toothed ring 503 and the positioning toothed ring 304 are positioned opposite each other. Through the pushing of the locking toothed ring 503 by the locking spring 502, the locking toothed ring 503 and the positioning toothed ring 304 are pushed and engaged. The locking assembly 500 locks the drive arm assembly 300 by engaging with the positioning gear ring 304. The locking spring 502 exerts a pushing force on the locking gear ring 503, causing the locking gear ring 503 to engage with the positioning gear ring 304. This engagement of the locking gear ring 503 and the positioning gear ring 304 fixes the drive arm assembly 300 in the outer frame 104, preventing it from rotating. This also fixes the actuating gear 303. The fixed actuating gear 303 then uses the toothed plate 203 to fix the conical inner rod 201 in the outer cylinder 101. This locks the flaw detection inner rod assembly 200 within the flaw detection outer cylinder assembly 100.

[0049] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A conical flaw detection device for polyurethane sieve plates, comprising a flaw detection outer cylinder assembly (100), characterized in that: The outer cylinder assembly (100) for flaw detection is slidably provided with an inner rod assembly (200) for physical penetration flaw detection of the polyurethane screen plate. A drive arm assembly (300) is rotatably provided on one side of the outer cylinder assembly (100). A force-applying arm assembly (400) is sleeved on the top of the outer cylinder assembly (100). The drive arm assembly (300) drives the inner rod assembly (200) to reset before flaw detection penetration. The force-applying arm assembly (400) drives the inner rod assembly (200) to apply force during flaw detection penetration. A locking assembly (500) is provided on one side of the drive arm assembly (300). The locking assembly (500) locks and fixes the penetration amount of the inner rod assembly (200) during flaw detection penetration.

2. The conical flaw detection device for polyurethane sieve plates according to claim 1, characterized in that: The flaw detection outer cylinder assembly (100) includes an outer cylinder (101) and an outer frame (104). A top cap platform (110) is fixedly provided on the top of the outer cylinder (101), and side sliding grooves (102) are provided on both sides of the outer cylinder (101). The outer frame (104) is fixedly provided on the outer wall of the outer cylinder (101). An L-shaped support arm (105) is fixedly provided on the bottom outer wall of the outer cylinder (101). A roller (106) is fixedly provided at the bottom of the L-shaped support arm (105). An end groove (103) is opened on the middle outer wall of the outer cylinder (101). A handle (107) and a side frame groove (109) are provided on the outer frame (104). A side end arm (108) is provided on the outside of the end groove (103).

3. The conical flaw detection device for polyurethane sieve plates according to claim 2, characterized in that: The flaw detection inner rod assembly (200) includes a tapered inner rod (201), an inner rod groove (202) is provided on the tapered inner rod (201), and a toothed toothed plate (203) is fixedly provided inside the inner rod groove (202).

4. The conical flaw detection device for polyurethane sieve plates according to claim 3, characterized in that: The drive arm assembly (300) includes a drive shaft (301), with a drive gear (302) and a positioning gear ring (304) fixedly installed at both ends of the drive shaft (301), and a toggle gear (303) fixedly installed in the middle of the drive shaft (301), with a toggle handle (305) fixedly installed on the toggle gear (303).

5. A conical flaw detection device for polyurethane sieve plates according to claim 4, characterized in that: The force-applying arm assembly (400) includes a force-applying toothed arm (401), a toothed arm top ring platform (402) is fixedly provided on the top of the force-applying toothed arm (401), a ring platform protrusion (403) is fixedly provided on the inner wall of the toothed arm top ring platform (402), and a ring platform spring (404) is fixedly provided on the top of the toothed arm top ring platform (402).

6. The conical flaw detection device for polyurethane sieve plates according to claim 5, characterized in that: The locking assembly (500) includes a locking rod (501), with a locking ball head (504) and a locking toothed ring (503) fixedly provided at both ends of the locking rod (501), and a locking spring (502) sleeved on the locking rod (501).

7. A conical flaw detection device for polyurethane sieve plates according to claim 6, characterized in that: The conical inner rod (201) slides up and down inside the outer cylinder (101), the toothed plate (203) faces the end groove (103), the drive shaft (301) is rotatably mounted on the side end arm (108), at this time the actuating gear (303) meshes with the toothed plate (203) through the end groove (103), the positioning toothed ring (304) faces the side frame groove (109), and the drive gear (302) faces the side away from the side frame groove (109).

8. The conical flaw detection device for polyurethane sieve plates according to claim 7, characterized in that: The toothed arm top ring platform (402) is sleeved on the outside of the outer cylinder (101). At this time, the ring platform protrusion (403) slides up and down in the side sliding groove (102). The force-applying toothed arm (401) is located inside the drive gear (302). At this time, the force-applying toothed arm (401) meshes with the drive gear (302). The top of the ring platform spring (404) abuts and is fixed to the bottom of the top cap platform (110), and the bottom of the ring platform spring (404) is fixed on the toothed arm top ring platform (402). Through the abutment of the ring platform spring (404), the toothed arm top ring platform (402) is in a downward structure on the outer cylinder (101).

9. A conical flaw detection device for polyurethane sieve plates according to claim 8, characterized in that: The locking rod (501) slides through the side frame groove (109) and the outer frame (104). At this time, the locking tooth ring (503) and the locking spring (502) are located inside the outer frame (104), the locking ball head (504) is located outside the outer frame (104), and the two ends of the locking spring (502) abut against the inner wall of the outer frame (104) and the locking tooth ring (503) respectively.

10. A conical flaw detection device for polyurethane sieve plates according to claim 9, characterized in that: The locking toothed ring (503) and the positioning toothed ring (304) are arranged opposite each other. The locking toothed ring (503) is pushed by the locking spring (502), and the locking toothed ring (503) and the positioning toothed ring (304) are pushed and engaged. The locking assembly (500) locks the rotation of the drive arm assembly (300) through the pushing engagement of the locking toothed ring (503) and the positioning toothed ring (304).

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