Method for detecting differential coupling device of vertical shaft cage guide

Through the detection method of the vertical well tank passage differential coupling device, combined with the positioning component and the detection component, the operating status of the tank passage and the shaking of the auxiliary rope are monitored in real time, which solves the problem of lack of prediction in the prior art and improves transportation safety and detection efficiency.

CN119954006AActive Publication Date: 2025-05-09JINING MINING GRP HAINA TECH ELECTROMECHANICAL CO
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Patent Information

Application Number
CN202510269168.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-03-07
Publication Date
2025-05-09
Estimated Expiration
2045-03-07

AI Technical Summary

Technical Problem

The existing vertical well tank channel detection methods lack prediction and it is difficult to monitor the operating status of tank channels in real time, resulting in threats to transportation safety and personal safety.

Method used

The vertical well tank passage differential coupling device detection method is adopted. Through appearance inspection, functional testing and electrical system inspection, combined with positioning components and detection components, the operating status of the tank passage and the shaking of the auxiliary rope are monitored in real time.

Benefits of technology

Real-time monitoring and fault prediction of opposite well tank channels is realized, which reduces the occurrence of accidents during transportation and improves transportation safety and detection efficiency.

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Abstract

The invention discloses a vertical shaft guide differential coupling device detection method, and relates to the technical field of detection equipment, and the method comprises the following steps: S1, appearance inspection: inspecting whether the structure of a device is complete or not, and inspecting whether lubricating oil / grease is sufficient or not; s2, functional testing, wherein no-load or load operation testing is conducted, and whether the vertical shaft cage guide can move normally or not is observed; s3, electrical system inspection: by simulating the ascending and descending states of the cage, testing whether an electrical control system can respond correctly, and inspecting whether a sensor can feed back the state of the cage accurately; according to the detection method for the differential linkage device of the vertical shaft cage guide, when the auxiliary rope shakes, the protection rod moves, so that the sensor is excited to record the shaking position when the main body moves, and meanwhile, the upwarp position of the outer surface of the auxiliary rope is detected; and when a bulge generated by breakage of the outer surface of the auxiliary rope moves to a position between the protection rod and the baffle, the protection rod is pushed to move, and the position is recorded.
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Description

Technical Field

[0001] The invention relates to detection equipment technology, and in particular to a detection method for a vertical shaft tank differential coupling device. Background Art

[0002] As the throat of coal mine production, mine hoisting equipment is the core hub connecting the surface and underground. The tankway, as a guiding device for the hoisting system running in the vertical shaft, plays a vital role in ensuring the stable, safe and rapid operation of the hoisting container.

[0003] The wire rope way working in the vertical shaft of a coal mine is prone to problems such as wire breakage, loose deformation of the outer layer and internal rust under conditions of long-term friction, water spray and temperature changes. If it is lifted and transported under such conditions for a long time, it will pose a great threat to transportation safety and personal safety.

[0004] During the long-term operation of the hoisting device, the vertical shaft tankway will be affected by factors such as the impact of geological tectonic movement, the impact of the hoisting container on the tankway, the corrosion of the humid environment, and the hardening and adhesion of dirt, resulting in a certain degree of overall or local deformation. These defects are input as excitations during the operation of the hoisting container, causing the hoisting container to be impacted to varying degrees and produce adverse vibrations, aggravating the lateral and longitudinal vibrations of the hoisting wire rope. In severe cases, it will cause the wire rope to break, the hoisting container to derail or get stuck, and casualties, affecting the safe and efficient operation of the coal mine. Therefore, defect detection of the vertical shaft tankway is of great significance.

[0005] A Chinese invention patent with publication number CN115771825A discloses an automatic detection system and method for a shaft hoisting tankway rope. The automatic detection system and method for a shaft hoisting tankway rope replaces the traditional manual random inspection of the tankway rope with automatic real-time inspection, and realizes automatic fault detection of the tankway rope through wireless connection between the intelligent detection module and the centralized control module; the rope diameter detection mechanism and the wear detection mechanism are integrated to realize rope diameter detection of the tankway rope and wear detection of the guide sleeve of the mobile tank cage during the movement of the mobile tank cage, thereby reducing the number of staff in the shaft, reducing the safety risk of the inspection work, and greatly improving the inspection accuracy and efficiency.

[0006] When the existing equipment is in use, the cage runs at a high speed during the lifting and transportation process, causing one end to shake and jolt. The friction of the cage is too large, which is prone to accidents. At the same time, most of the current detection methods are based on post-fault diagnosis or regular inspections, which lack sufficient predictive power, resulting in poor overall detection results. Therefore, a detection method for the differential coupling device of the vertical shaft tankway has been developed. Summary of the invention

[0007] The object of the present invention is to provide a method for detecting a differential coupling device of a vertical shaft tankway to solve the above-mentioned deficiencies in the prior art.

[0008] In order to achieve the above object, the present invention provides the following technical solution: a method for detecting a vertical shaft tank differential coupling device, comprising the following steps: S1. Appearance inspection: Check whether the structure of the device is complete and whether the lubricating oil / grease is sufficient; S2. Functional test: no-load or loaded operation test to observe whether the shaft tankway can move normally; S3. Electrical system inspection: By simulating the cage rising and falling states, test whether the electrical control system can respond correctly, and check whether the sensor can accurately feedback the cage status; In S2, the running status of the main body is detected, a main rope is arranged at the middle position of the upper end of the main body, auxiliary ropes are arranged at the upper end of the main body and on both sides of the main rope, and a positioning component is arranged on the outer surface of the auxiliary rope, and the running status of the main body is monitored by the positioning component; The positioning assembly comprises a connection block with an external fixing member, a fixing block is arranged at the end of the connection block, a support plate is arranged on the inner wall of the fixing block, a slide groove is arranged at the end of the support plate, and a positioning rod is slidably installed on the inner wall of the slide groove; An adjusting rod is rotatably mounted on the outer surface of the positioning rod, and a first elastic member is disposed at the end of the supporting plate, wherein one end of the first elastic member is away from the supporting plate and the outer surface of the adjusting rod; A limiting block is arranged at the end of the fixed block, an adjusting plate is slidably mounted at the end of the limiting block, a guide groove is opened at the end of the adjusting plate, and a second elastic member is arranged on the inner wall of the guide groove; A protective rod is provided at the end of the adjusting rod, the outer surface of the end of the protective rod is slidably connected to the inner wall of the guide groove, a baffle is provided at the end of the adjusting plate, and the auxiliary rope is located between the baffle and the protective rod; A detection component is assembled at the end of the main body, and the running state of the main body is detected by the detection component.

[0009] As a further optimization solution of the present invention, the cross section of the guide groove is H-shaped, and two second elastic members are provided on the inner wall of the guide groove, and the ends of the two second elastic members are slidably connected.

[0010] As a further optimization solution of the present invention, the detection assembly includes a base plate connected to the upper end of the main body, and a limit rod is rotatably installed on the upper end of the base plate.

[0011] As a further optimization solution of the present invention, a positioning plate is rotatably mounted on the end of the limit rod, a movable block is rotatably mounted on the end of the positioning plate, and a support column is provided on the outer surface of the movable block.

[0012] As a further optimization solution of the present invention, a slot is provided on the outer surface of the bottom plate, and the inner wall of the slot is slidably connected to the outer surface of the support column.

[0013] As a further optimization scheme of the present invention, the cross section of the positioning plate is triangular, and a detection member is rotatably mounted on one end of the positioning plate away from the movable block, and the lower end of the detection member is connected to the upper end of the base plate.

[0014] As a further optimization solution of the present invention, a docking block is provided at the end of the movable block, and a clamping block is provided at the end of the docking block.

[0015] As a further optimization solution of the present invention, a detection rod is slidably mounted on the inner wall of the clamping block, the end of the detection rod penetrates and extends to the outside of the clamping block, and a pressing block is provided at the end of the detection rod.

[0016] As a further optimization solution of the present invention, a third elastic member is sleeved on the outer surface of the detection rod, one end of the third elastic member is connected to the outer surface of the detection rod, and the other end is connected to the outer surface of the clamping block.

[0017] As a further optimization scheme of the present invention, a swing block is rotatably mounted on the end of the clamping block, a roller is rotatably mounted on the end of the swing block, and the outer surface of the swing block is in contact with the end of the detection rod.

[0018] Compared with the prior art, the present invention provides a method for detecting a differential coupling device for a vertical shaft tankway, which has the following beneficial effects: when the auxiliary rope shakes, the protective rod moves, thereby stimulating the sensor, recording the position of the shaking when the main body moves, and detecting the raised position of the outer surface of the auxiliary rope at the same time; when the protrusion generated by the break on the outer surface of the auxiliary rope moves between the protective rod and the baffle, the protective rod is pushed to move, and the position is recorded.

[0019] The detection rod is supported by the third elastic member, thereby pushing the swing block to fit tightly against the inner wall of the transport channel, so that when the main body vibrates or shakes, it can be recorded immediately, thereby reducing unexpected accidents during subsequent use. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0021] Figure 1 A schematic diagram of the overall structure provided by an embodiment of the present invention; Figure 2 A first schematic diagram of a positioning assembly structure provided by an embodiment of the present invention; Figure 3 A second schematic diagram of a positioning assembly structure provided by an embodiment of the present invention; Figure 4 A cross-sectional view of the internal structure of a positioning assembly provided by an embodiment of the present invention; Figure 5 A first schematic diagram of the detection component structure provided by an embodiment of the present invention; Figure 6 A second schematic diagram of the detection component structure provided by an embodiment of the present invention; Figure 7 A schematic diagram of the structure of a clamping block provided in an embodiment of the present invention; Figure 8 A cross-sectional view of the inner wall structure of a clamping block provided in an embodiment of the present invention.

[0022] Description of reference numerals: 1. Main body; 2. Positioning assembly; 3. Detection assembly; 11. Main rope; 12. Auxiliary rope; 21. Fixed block; 211. Limit block; 22. Connecting block; 23. Support plate; 24. Slide; 25. Positioning rod; 26. First elastic member; 27. Adjusting rod; 271. Protective rod; 28. Adjusting plate; 281. Guide groove; 282. Baffle; 29. ​​Second elastic member; 31. Bottom plate; 311. Slot; 32. Limiting rod; 33. Positioning plate; 34. Support column; 35. Movable block; 36. Detection member; 37. Docking block; 38. Clamping block; 381. Detection rod; 382. Extrusion block; 383. Third elastic member; 39. Swinging block; 391. Roller. DETAILED DESCRIPTION

[0023] 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.

[0024] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 limiting the present invention; the terms "first", "second", and "third" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance. In addition, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] Example: See Figure 1-Figure 8 A method for detecting a vertical shaft tank differential coupling device comprises the following steps: S1. Appearance inspection: Check whether the structure of the device is complete and whether the lubricating oil / grease is sufficient; S2. Functional test: no-load or loaded operation test to observe whether the shaft tankway can move normally; S3. Electrical system inspection: By simulating the cage rising and falling states, test whether the electrical control system can respond correctly, and check whether the sensor can accurately feedback the cage status; Among them, the operating status of the main body 1 is detected in S2, a main rope 11 is arranged in the middle position of the upper end of the main body 1, and auxiliary ropes 12 are arranged at the upper end of the main body 1 and on both sides of the main rope 11. A positioning component 2 is arranged on the outer surface of the auxiliary rope 12, and the operating status of the main body 1 is monitored by the positioning component 2.

[0026] In this solution, the main body 1 is pulled up by the main rope 11 and the auxiliary rope 12, and the auxiliary rope 12 is limited by the positioning component 2, so that the shaking condition of the auxiliary rope 12 is monitored to ensure the stability of the main body 1 during operation.

[0027] Furthermore, the positioning assembly 2 includes a connecting block 22 connected to an external fixing member, a fixing block 21 is provided at the end of the connecting block 22, a support plate 23 is provided on the inner wall of the fixing block 21, a slide groove 24 is opened at the end of the support plate 23, and a positioning rod 25 is slidably installed on the inner wall of the slide groove 24.

[0028] In this embodiment, the fixing member is connected to the portion outside the transport channel, so as to ensure the stability of the positioning assembly 2 . At the same time, the fixing block 21 is limited by the connecting block 22 , and the stability of the fixing block 21 is ensured.

[0029] The positioning rod 25 is limited by the sliding groove 24 so that the positioning rod 25 will not fall off when it moves.

[0030] Furthermore, an adjusting rod 27 is rotatably mounted on the outer surface of the positioning rod 25 , and a first elastic member 26 is disposed at the end of the supporting plate 23 . The first elastic member 26 is away from one end of the supporting plate 23 and the outer surface of the adjusting rod 27 .

[0031] Specifically, the first elastic member 26 is an elastic component such as a spring, and the adjusting rod 27 is supported by the first elastic member 26, wherein the cross-section of the two adjusting rods 27 is V-shaped, and the auxiliary rope 12 is limited by the protective rod 271 arranged at the end of the adjusting rod 27.

[0032] Furthermore, a limit block 211 is provided at the end of the fixed block 21, and an adjustment plate 28 is slidably mounted on the end of the limit block 211. A guide groove 281 is provided at the end of the adjustment plate 28, and a second elastic member 29 is provided on the inner wall of the guide groove 281. The cross section of the guide groove 281 is h-shaped, and two second elastic members 29 are provided on the inner wall of the guide groove 281. The ends of the two second elastic members 29 are slidably connected. Specifically, the adjustment plate 28 is supported by the limiting block 211 , wherein a protrusion is provided at the end of the adjustment plate 28 , and a groove is provided at the end of the limiting block 211 , and the outer surface of the protrusion is slidably connected to the inner wall of the groove.

[0033] At the same time, the protective rod 271 is on the outer surface of the joint of the two second elastic parts 29. When the main body 1 shakes, it drives the auxiliary rope 12 to shake, thereby squeezing the protective rod 271 or the baffle 282, causing one of the second elastic parts 29 to contract, so that the protective rod 271 moves to the inner wall of the other guide groove 281.

[0034] The second elastic member 29 is an elastic member such as a spring, and a member having a signal transmission function such as a sensor is disposed on the inner wall of the second elastic member 29 , which is used to detect the state of the auxiliary rope 12 .

[0035] Furthermore, a protective rod 271 is provided at the end of the adjusting rod 27, and the outer surface of the end of the protective rod 271 is slidably connected to the inner wall of the guide groove 281. A baffle 282 is provided at the end of the adjusting plate 28, and the auxiliary rope 12 is located between the baffle 282 and the protective rod 271.

[0036] Specifically, when the auxiliary rope 12 shakes, the protective rod 271 moves, thereby stimulating the sensor to record the position where the shaking occurs when the main body 1 moves, and at the same time detect the position where the outer surface of the auxiliary rope 12 is raised. When the protrusion caused by the breakage of the outer surface of the auxiliary rope 12 moves between the protective rod 271 and the baffle 282, the protective rod 271 is pushed to move and the position is recorded.

[0037] Furthermore, the detection assembly 3 is assembled at the end of the main body 1, and the running state of the main body 1 is detected by the detection assembly 3. The detection assembly 3 includes a bottom plate 31 connected to the upper end of the main body 1, and a limit rod 32 is rotatably mounted on the upper end of the bottom plate 31. A positioning plate 33 is rotatably mounted on the end of the limit rod 32, and a movable block 35 is rotatably mounted on the end of the positioning plate 33, and a support column 34 is provided on the outer surface of the movable block 35.

[0038] In this embodiment, the support column 34 is a component with a telescopic function such as a telescopic rod, which is used to support the movable block 35 to ensure that the movable block 35 remains stable as a whole when moving.

[0039] At the same time, when the movable block 35 moves, the positioning plate 33 arranged at its end is driven to move. Since the end of the positioning plate 33 is rotatably connected to the upper end of the base plate 31, the end of the positioning plate 33 is limited by the limit rod 32, and the positioning plate 33 drives the detection member 36 to move.

[0040] Furthermore, a slot 311 is provided on the outer surface of the bottom plate 31, and the inner wall of the slot 311 is slidably connected to the outer surface of the support column 34. The cross section of the positioning plate 33 is triangular, and a detection member 36 is rotatably mounted on one end of the positioning plate 33 away from the movable block 35, and the lower end of the detection member 36 is connected to the upper end of the bottom plate 31.

[0041] Specifically, the support column 34 is limited by a slot 311 provided on the side of the bottom plate 31 to ensure that no interference occurs when the support column 34 moves. The detection member 36 is a device with a pressure detection function such as a pressure sensor, and is connected to an external control device.

[0042] Further, a docking block 37 is provided at the end of the movable block 35, and a clamping block 38 is provided at the end of the docking block 37. A detection rod 381 is slidably mounted on the inner wall of the clamping block 38, and the end of the detection rod 381 penetrates and extends to the outside of the clamping block 38, and a pressing block 382 is provided at the end of the detection rod 381.

[0043] Specifically, the butt joint block 37 is connected to the end of the clamping block 38, and different clamping blocks 38 are adjusted according to actual conditions to make it suitable for different scenarios.

[0044] The squeezing block 382 is a device with a pressure detection function such as a squeezing sensor. The detection rod 381 is detected by the squeezing block 382, ​​so as to monitor the running status of the main body 1 in real time.

[0045] Furthermore, a third elastic member 383 is sleeved on the outer surface of the detection rod 381 , one end of the third elastic member 383 is connected to the outer surface of the detection rod 381 , and the other end is connected to the outer surface of the clamping block 38 .

[0046] Specifically, the third elastic member 383 is an elastic component such as a spring. The detection rod 381 is supported by the third elastic member 383, thereby pushing the swing block 39 to fit tightly against the inner wall of the transport channel, so that when the main body 1 vibrates or shakes, it can be recorded immediately.

[0047] Furthermore, a swing block 39 is rotatably mounted on the end of the clamping block 38 , a roller 391 is rotatably mounted on the end of the swing block 39 , and the outer surface of the swing block 39 is in contact with the end of the detection rod 381 .

[0048] Specifically, a torsion spring is provided at the rotational connection between the swing block 39 and the clamping block 38, which is used to support the swing block 39 and cooperate with the roller 391 installed at the end of the swing block 39 to fit the inner wall of the transport channel.

[0049] The control device can select a single-chip microcomputer as the control end. In this embodiment, the single-chip microcomputer is a typical embedded microcontroller (Micro controller unit), which is composed of an arithmetic unit, a controller, a memory, an input and output device, etc., which is equivalent to a microcomputer. Compared with the general-purpose microprocessor used in personal computers, it emphasizes self-supply (no external hardware) and cost saving. Its biggest advantage is that it is small in size and can be placed inside the instrument, but it has a small storage capacity, a simple input and output interface, and low functional consumption.

[0050] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A method for detecting a differential coupling device of a vertical shaft tankway, characterized in that: The following steps are involved: S1. Appearance inspection: Check whether the structure of the device is complete and whether the lubricating oil / grease is sufficient; S2. Functional test: no-load or loaded operation test to observe whether the shaft tankway can move normally; S3. Electrical system inspection: By simulating the cage rising and falling states, test whether the electrical control system can respond correctly, and check whether the sensor can accurately feedback the cage status; In S2, the running status of the main body (1) is detected, a main rope (11) is arranged at the middle position of the upper end of the main body (1), auxiliary ropes (12) are arranged at the upper end of the main body (1) and on both sides of the main rope (11), and a positioning component (2) is arranged on the outer surface of the auxiliary rope (12), and the running status of the main body (1) is monitored through the positioning component (2); The positioning assembly (2) comprises a connection block (22) connected to an external fixing member, a fixing block (21) is arranged at the end of the connection block (22), a support plate (23) is arranged on the inner wall of the fixing block (21), a slide groove (24) is arranged at the end of the support plate (23), and a positioning rod (25) is slidably mounted on the inner wall of the slide groove (24); An adjusting rod (27) is rotatably mounted on the outer surface of the positioning rod (25); a first elastic member (26) is provided at the end of the support plate (23); an end of the first elastic member (26) away from the support plate (23) is in contact with the outer surface of the adjusting rod (27); A limit block (211) is provided at the end of the fixed block (21), an adjustment plate (28) is slidably mounted at the end of the limit block (211), a guide groove (281) is provided at the end of the adjustment plate (28), and a second elastic member (29) is provided on the inner wall of the guide groove (281); A protective rod (271) is provided at the end of the adjusting rod (27), the outer surface of the end of the protective rod (271) is slidably connected to the inner wall of the guide groove (281), a baffle (282) is provided at the end of the adjusting plate (28), and the auxiliary rope (12) is located between the baffle (282) and the protective rod (271); A detection component (3) is assembled at the end of the main body (1), and the operating state of the main body (1) is detected through the detection component (3).

2. A method for detecting a vertical shaft tank differential coupling device according to claim 1, characterized in that: The cross section of the guide groove (281) is H-shaped, and the inner wall of the guide groove (281) is provided with two second elastic members (29), and the ends of the two second elastic members (29) are slidably connected.

3. A method for detecting a vertical shaft tank differential coupling device according to claim 1, characterized in that: The detection assembly (3) comprises a bottom plate (31) connected to the upper end of the main body (1), and a limit rod (32) is rotatably mounted on the upper end of the bottom plate (31).

4. A method for detecting a vertical shaft tank differential coupling device according to claim 3, characterized in that: A positioning plate (33) is rotatably mounted on the end of the limiting rod (32), a movable block (35) is rotatably mounted on the end of the positioning plate (33), and a support column (34) is provided on the outer surface of the movable block (35).

5. A method for detecting a vertical shaft tank differential coupling device according to claim 4, characterized in that: A slot hole (311) is provided on the outer surface of the bottom plate (31), and the inner wall of the slot hole (311) is slidably connected to the outer surface of the support column (34).

6. A method for detecting a vertical shaft tank differential coupling device according to claim 5, characterized in that: The cross section of the positioning plate (33) is triangular, and a detection member (36) is rotatably mounted on one end of the positioning plate (33) away from the movable block (35), and the lower end of the detection member (36) is connected to the upper end of the bottom plate (31).

7. A method for detecting a vertical shaft tank differential coupling device according to claim 6, characterized in that: A docking block (37) is provided at the end of the movable block (35), and a clamping block (38) is provided at the end of the docking block (37).

8. A method for detecting a vertical shaft tank differential coupling device according to claim 7, characterized in that: A detection rod (381) is slidably mounted on the inner wall of the clamping block (38), the end of the detection rod (381) penetrates and extends to the outside of the clamping block (38), and a pressing block (382) is provided at the end of the detection rod (381).

9. A method for detecting a vertical shaft tank differential coupling device according to claim 8, characterized in that: A third elastic member (383) is sleeved on the outer surface of the detection rod (381); one end of the third elastic member (383) is connected to the outer surface of the detection rod (381), and the other end is connected to the outer surface of the clamping block (38).

10. A method for detecting a vertical shaft tank differential coupling device according to claim 9, characterized in that: A swing block (39) is rotatably mounted on the end of the clamping block (38), and a roller (391) is rotatably mounted on the end of the swing block (39), while the outer surface of the swing block (39) is in contact with the end of the detection rod (381).

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