Dynamic detection device and method for axial fit clearance of inner shaft of pump body

Abstract

The invention provides a dynamic detection device and method for axial fit clearance of an inner shaft of a pump body, and relates to the technical field of dynamic detection of axial fit clearance, and the dynamic detection device comprises a cylindrical base, a rotating cylinder, a measuring mechanism and a lifting-counterweight assembly. According to the invention, by designing the cylindrical base, the rotating cylinder, the measuring mechanism and the lifting-counterweight assembly, during detection, the annular counterweight piece based on the lifting-counterweight assembly applies a downward pulling force to the inner shaft of the pump body, the pulling force is generated by the dead weight of the annular counterweight piece, and the pulling force is always kept stable in the process that the rotating cylinder drives the inner shaft of the pump body to rotate; and the measuring mechanism detects the axial displacement of the top end of the shaft in the pump body, so that the detection accuracy and reliability are ensured.

Description

Technical Field

[0001] The present invention relates to the field of intelligent sensors, in particular to the technical field of dynamic detection of axial fit clearance, and in particular to a device and method for dynamically detecting the axial fit clearance of a shaft within a pump body. Background Art

[0002] The pump body is a core component of fluid delivery systems. The axial clearance between its internal rotating shaft and the pump casing directly affects the pump's operating efficiency, vibration and noise, and service life. In industrial applications (such as petrochemicals, nuclear power, and ship propulsion), excessive axial clearance can lead to increased leakage and reduced efficiency, while too little clearance can cause friction, wear, and even seizure. Therefore, accurately measuring the axial clearance of the pump body's internal shaft is crucial to ensuring complete equipment assembly and safe operation.

[0003] Traditional axial fit detection methods are mostly in the form of applying pressure from the upper part; for example, the invention patent with publication number: CN100447402C records: A detection device for detecting the axial clearance of the inner shaft of a pump body in the field of mechanical component detection, including: an upper tightening mechanism, a workpiece positioning mechanism, an axial lifting mechanism, an inner shaft rotation mechanism, and an upper clamping mechanism including a cylinder or an oil cylinder, a reference pressure block, a press-in block, a press-in motor, a reducer, a synchronous belt, a clamping rod, a press-in position sensor, and a height measuring sensor; during its use, since the height measuring sensor is installed on the press-in block, a spring is used above the press-in block to balance the pressure, the axial clearance fluctuates during the detection process, causing the pressure of the press-in block to fluctuate, thereby making it impossible to ensure the accuracy of the detection. For this reason, the present invention provides a dynamic detection device and method for the axial fit clearance of the inner shaft of a pump body. Summary of the Invention

[0004] In response to the shortcomings of the existing technology, the present invention provides a dynamic detection device and method for the axial fit clearance of the inner shaft of the pump body, which solves the problem that the axial clearance fluctuation during the detection process causes the pressure of the pressed-in block to fluctuate, thereby making it impossible to ensure the accuracy of the detection.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0006] A dynamic detection device for the axial fit clearance of a pump body inner shaft, comprising:

[0007] a cylindrical base having a closed bottom and an open top;

[0008] The rotating cylinder is mounted on the top of the cylindrical base, and a driving frame for driving the shaft in the pump body to rotate is provided on the inner side of the rotating cylinder;

[0009] A measuring mechanism, mounted on the outside of the cylindrical base, for detecting the axial displacement of the top end of the shaft in the pump body;

[0010] The lifting-counterweight assembly includes a lifting member, a pallet member, and an annular counterweight member. The bottom end of the lifting member is fixedly mounted on the inner bottom of the cylindrical base, the pallet member is fixedly mounted on the top telescopic end of the lifting member, a limiting frame is fixedly mounted on the outside of the fixed shell of the lifting member, the annular counterweight member is sleeved on the outside of the lifting member, and the annular counterweight member is located above the limiting frame, and a suction cup assembly is provided on the top of the annular counterweight member.

[0011] Preferably, the cylindrical base comprises:

[0012] A first cylinder, wherein the bottom end of the first cylinder is closed and a plurality of support legs distributed in a circular array are fixedly mounted on the outer side of the first cylinder;

[0013] The top end of the first cylinder extends outward and is fixedly connected to the second cylinder.

[0014] Preferably, the rotating drum comprises:

[0015] A third cylinder, wherein the bottom end of the third cylinder is rotatably mounted on the inner side of the second cylinder via a bearing, and a drive frame is fixedly mounted on the inner side of the third cylinder, and two sets of drive frames are provided;

[0016] A motor, wherein the motor is fixedly mounted on the outside of the second cylinder, and a driving gear is fixedly mounted on the output end of the motor;

[0017] A gear ring is fixedly mounted on the outer side of the third cylinder, and the driving gear and the gear ring are meshed with each other.

[0018] Preferably, the measuring mechanism comprises:

[0019] A support system, the support system being fixedly connected to the outer side surface of the first cylinder;

[0020] A measuring disc, wherein a sleeve member is fixedly provided on the side of the measuring disc, the sleeve member is slidably connected to the support system along the axial direction of the first cylinder, and a top nut member and a bottom nut member are respectively threadedly installed on the upper and lower ends of the sleeve member on the support system;

[0021] The measuring disk is located right above the rotating cylinder and is fixedly mounted with at least one measuring device.

[0022] Preferably, the support system includes:

[0023] A side frame fixedly mounted on the outer side of the first cylinder along the radial direction of the first cylinder;

[0024] The vertical pole piece includes an integrally arranged fixing column and a screw column, the bottom end of the fixing column is fixedly connected to the side frame, and the bottom end of the screw column is fixedly connected to the top end of the fixing column.

[0025] Preferably, the frame member comprises:

[0026] A first frame, wherein a sliding hole is formed on the top of the first frame, and the first frame is integrally provided with the measuring disk;

[0027] A second frame, the second frame is arranged parallel to the first frame, and the second frame is fixedly connected to the top of the first frame through a vertical frame;

[0028] A rectangular notch is provided on the side of the screw column, a frame-shaped part is fixedly connected to the first sleeve, a sliding rod is slidably provided on the inner side of the frame-shaped part, one end of the sliding rod corresponds to the rectangular notch, an elastic block is provided between the other end of the sliding rod and the vertical frame, a side hole is provided on the side of the vertical frame, a pull rod is slidably connected to the side hole, and one end of the pull rod is hung on the top of the sliding rod.

[0029] Preferably, the center position of the top end of the tray member is recessed downward to form a center groove, and an annular graphite pad is fixedly mounted on the top end of the tray member.

[0030] Preferably, the annular counterweight comprises:

[0031] An annular body, wherein a plurality of parallel flanges are fixedly connected to the outer side of the annular body, and a counterweight area is formed between two adjacent flanges;

[0032] A counterweight block is installed inside the counterweight area;

[0033] An electromagnetic ring is fixedly mounted on the top of the uppermost flange.

[0034] Preferably, the counterweight block is formed into an annular structure by a plurality of independent arc-shaped blocks.

[0035] A method for dynamically detecting the axial clearance of a shaft in a pump body, using the above-mentioned dynamic detection device for the axial clearance of a shaft in a pump body, specifically comprises the following steps:

[0036] S1. When in the detection preparation state, the lifting member of the lifting-counterweight assembly is controlled to be in the retracted state;

[0037] During the inspection, the shaft inside the pump body is placed inside the rotating drum, with the bottom end of the shaft inside the pump body supported by the tray, and the top end of the annular counterweight in contact with the bottom of the shaft inside the pump body. The suction cup assembly is controlled to work so that the annular counterweight is sucked onto the shaft inside the pump body. Then the lifting component is controlled to rise, driving the shaft inside the pump body and the annular counterweight to move upward synchronously, and the weight of the annular counterweight applies downward pressure to the shaft inside the pump body.

[0038] S2. Control the rotation of the rotating cylinder, which drives the shaft inside the pump body to rotate; at the same time, the measuring mechanism detects the axial displacement of the top end of the shaft inside the pump body.

[0039] The present invention provides a device and method for dynamically detecting the axial clearance of the inner shaft of a pump body. It has the following beneficial effects:

[0040] 1. The present invention is designed with a cylindrical base, a rotating cylinder, a measuring mechanism and a lifting-counterweight assembly. During detection, the annular counterweight of the lifting-counterweight assembly applies a downward pulling force to the inner shaft of the pump body. The pulling force is generated by the deadweight of the annular counterweight. When the rotating cylinder drives the inner shaft of the pump body to rotate, the pulling force is always kept stable. The measuring mechanism detects the axial displacement of the top end of the shaft in the pump body, thereby ensuring the accuracy and reliability of the detection.

[0041] 2. The present invention, through the design of a cylindrical base, a rotating cylinder, a measuring mechanism and a lifting-counterweight assembly, can perform dynamic detection on the inner shaft of the pump body alone, without the need to coordinate with the pump body, bearings, flanges and other structures to simulate actual working conditions. The measurement process is simple and the measurement efficiency is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 A three-dimensional diagram of a dynamic detection device for the axial clearance of the inner shaft of a pump body proposed by the present invention;

[0043] Figure 2 This is a front view of a dynamic detection device for the axial fit clearance of a pump body proposed by the present invention;

[0044] Figure 3 A side view of a dynamic detection device for the axial clearance of the inner shaft of a pump body proposed by the present invention;

[0045] Figure 4 A top view of a dynamic detection device for the axial clearance of the inner shaft of a pump body proposed by the present invention;

[0046] Figure 5 for Figure 4 Sectional view of the section line at AA;

[0047] Figure 6 for Figure 5 A partial enlarged view of point B in the middle;

[0048] Figure 7 This is a schematic diagram of the installation of a measuring disc and a measuring device of a dynamic detection device for the axial fit clearance of a pump body shaft proposed by the present invention;

[0049] Figure 8 A three-dimensional schematic diagram of a rotating cylinder of a dynamic detection device for the axial fit clearance of a pump body shaft proposed by the present invention;

[0050] Figure 9A three-dimensional schematic diagram of an annular counterweight and a lifting platform of a dynamic detection device for the axial clearance of the inner shaft of a pump body proposed by the present invention;

[0051] Figure 10 This is a three-dimensional schematic diagram of a lifting platform of a dynamic detection device for the axial fit clearance of the inner shaft of a pump body proposed by the present invention.

[0052] Among them, 1. Cylindrical base; 101. First cylinder; 102. Tripod; 103. Second cylinder; 2. Rotating cylinder; 201. Third cylinder; 201a. Drive frame; 202. Ring gear; 203. Motor; 204. Drive gear; 3. Measuring mechanism; 301. Side frame; 302. Fixed column; 303. Screw column; 304. Measuring disk; 305. Measuring device; 306. First frame; 307. Sliding hole; 308. Rectangular notch; 309. Bottom nut; 3010. Top nut 3011. Vertical frame; 3012. Second set of frames; 3013. Side hole; 3014. Frame member; 3015. Sliding rod; 3016. Elastic block; 3017. Pull rod; 4. Lifting-counterweight assembly; 401. Lifting member; 402. Tray member; 402a. Center groove; 402b. Annular graphite pad; 403. Limiting frame; 404. Annular counterweight member; 404a. Counterweight area; 40401. Ring body; 40402. Flange; 40403. Counterweight block; 40404. Electromagnetic ring. DETAILED DESCRIPTION

[0053] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0054] Example 1:

[0055] like Figures 1-10 As shown, a dynamic detection device for the axial fit clearance of the inner shaft of a pump body provided by an embodiment of the present invention is in the field of intelligent sensors, which is used to dynamically detect the axial fit clearance to ensure the complete assembly and safe operation of the equipment fuel pump. It specifically includes: a cylindrical base 1, a rotating cylinder 2, a measuring mechanism 3 and a lifting-counterweight assembly 4.

[0056] The bottom end of the cylindrical base 1 is closed and the top end is open, which is convenient for installing and supporting the rotating cylinder 2 and the lifting-counterweight assembly 4. The rotating cylinder 2 is installed on the top of the cylindrical base 1, and a driving frame 201a is provided on the inner side of the rotating cylinder 2 to drive the inner shaft of the pump body to rotate. When in use, the rotating cylinder 2 rotates (relative to the cylindrical base 1), and the driving frame 201a drives the inner shaft of the pump body to rotate, simulating the dynamic rotation of the inner shaft of the pump body. The measuring mechanism 3 is installed on the outside of the cylindrical base 1 for detecting the axial displacement of the top end of the inner shaft of the pump body. The core component of the measuring mechanism 3 is a contact / non-contact distance measuring part, such as an electronic dial indicator, a high-precision optical distance measuring instrument, etc. The lifting-counterweight assembly 4 is installed at the center position of the inner bottom of the cylindrical base 1 for supporting the inner shaft of the pump body and applying a stable downward pulling force to the inner shaft of the pump body.

[0057] The lifting-counterweight assembly 4 includes a lifting member 401, a tray member 402, and an annular counterweight member 404. The lifting member 401 is a pneumatic, hydraulic or electric extension rod. The bottom end of the lifting member 401 is fixedly mounted on the inner bottom of the cylindrical base 1, and the tray member 402 is fixedly mounted on the top telescopic end of the lifting member 401. The tray member 402 is used to support the bottom end of the inner shaft of the pump body, keeping the axis of the inner shaft of the pump body consistent with the center line of the lifting-counterweight assembly 4. A limiting frame 403 is fixedly mounted on the outside of the fixed shell of the lifting member 401. The annular counterweight member 404 is sleeved on the outside of the lifting member 401, and the annular counterweight member 404 is located above the limiting frame 403. The limiting frame 403 is used to support the annular counterweight member 404. A suction cup assembly is provided on the top of the annular counterweight member 404. The suction cup assembly is an electromagnetic suction cup or a vacuum suction cup, which is used to fix the annular counterweight member 404 to the bottom end of the inner shaft of the pump body.

[0058] When in use, the pump body shaft is placed inside the rotating cylinder 2, and the tray part 402 supports the bottom shaft head of the pump body shaft. At this time, the top of the annular counterweight 404 contacts the bottom of the pump body shaft, and the suction cup assembly is controlled to work so that the annular counterweight 404 is sucked onto the pump body shaft. Then the lifting part 401 is controlled to rise, driving the pump body shaft and the annular counterweight 404 to move upward synchronously, and the weight of the annular counterweight 404 is used to apply downward pressure to the pump body shaft; then the rotating cylinder 2 is controlled to rotate, and the rotating cylinder 2 drives the pump body shaft to rotate, and at the same time the measuring mechanism 3 detects the axial displacement of the top end of the pump body shaft.

[0059] The detection mechanism of the above process is to ensure that there is appropriate pressure between one end of the shaft in the pump body and the end of the sealing plate / bearing inner ring, measure the axial clearance and axial clearance fluctuation of the other end of the shaft in the pump body, and thus judge the clearance condition of the shaft in the pump body during actual use. Therefore, when necessary, a pump body shaft needs to be tested twice in the forward and reverse directions.

[0060] By designing the cylindrical base 1, the rotating cylinder 2, the measuring mechanism 3 and the lifting-counterweight assembly 4, during the detection, the annular counterweight 404 based on the lifting-counterweight assembly 4 applies a downward pulling force to the inner shaft of the pump body. The pulling force is generated by the deadweight of the annular counterweight 404. In the process of the rotating cylinder 2 driving the inner shaft of the pump body to rotate, the pulling force is always kept stable. The measuring mechanism 3 detects the axial displacement of the top end of the shaft in the pump body, thereby ensuring the accuracy and reliability of the detection.

[0061] In one embodiment, the cylindrical base 1 includes a first cylindrical body 101 , a support frame 102 and a second cylindrical body 103 .

[0062] The bottom end of the first cylinder 101 is closed, and a number of support legs 102 distributed in a circular array are fixedly installed on the outside of the first cylinder 101. The support legs 102 are used to stably support the first cylinder 101 and can be placed on a workbench to keep the first cylinder 101 in a vertical state. The top end of the first cylinder 101 extends outward and is fixedly connected to the second cylinder 103. The second cylinder 103 is used to install the rotating cylinder 2. The diameter (outer diameter and inner diameter) of the second cylinder 103 is larger than that of the first cylinder 101. The first cylinder 101, the support legs 102 and the second cylinder 103 are cast in one piece.

[0063] In one embodiment, the rotating drum 2 includes a third drum 201 , a driving frame 201 a , a motor 203 , a driving gear 204 , and a ring gear 202 .

[0064] The bottom end of the third cylinder 201 is rotatably mounted on the inner side of the second cylinder 103 through a bearing. The third cylinder 201 can rotate relative to the second cylinder 103. The driving frame 201a is fixedly mounted on the inner side of the third cylinder 201. Two groups of driving frames 201a are provided. Generally, the protruding part of the shaft (cam) in the pump body is aligned between the two groups of driving frames 201a. In this way, the third cylinder 201 can smoothly drive the shaft in the pump body to rotate. The motor 203 is fixedly mounted on the outer side of the second cylinder 103, and a driving gear 204 is fixedly mounted on the output end of the motor 203. A ring gear 202 is fixedly mounted on the outer side of the third cylinder 201. The driving gear 204 and the ring gear 202 are engaged with each other, and the transmission between the driving gear 204 and the ring gear 202 is a reduction transmission.

[0065] When in use, the motor 203 is powered on, and the output shaft of the motor 203 drives the driving gear 204 to rotate. The driving gear 204 and the ring gear 202 engage with each other, thereby driving the ring gear 202 to rotate. The ring gear 202 is fixed to the third cylinder 201, and the ring gear 202 and the third cylinder 201 rotate synchronously. The driving frame 201a inside the third cylinder 201 drives the inner shaft of the pump body to rotate.

[0066] In one embodiment, the measuring mechanism 3 includes: a support system, a measuring plate 304 , a frame member, and a measurer 305 .

[0067] It is fixedly connected to the outer side surface of the first cylinder 101, and the support system is vertically arranged for installing the measuring disk 304, the sleeve frame and the measuring device 305. The side of the measuring disk 304 is fixedly provided with a sleeve frame, and the sleeve frame and the support system are slidably connected along the axial direction of the first cylinder 101. The top nut member 3010 and the bottom nut member 309 are threadedly installed on the support system and located at the upper and lower ends of the sleeve frame. By adjusting the top nut member 3010 and the bottom nut member 309, the height position of the measuring disk 304 and the sleeve frame can be slidably adjusted. After the adjustment is completed, the measuring disk 304 and the sleeve frame are fixed by the top nut member 3010 and the bottom nut member 309. The measuring disk 304 is located directly above the rotating cylinder 2 and is fixed with at least one measuring device 305. The measuring device 305 is preferably an electronic dial indicator, and its measurement structure is accurate and reliable.

[0068] When placing the inner shaft of the pump body, the measuring disc 304, the bracket and the measuring device 305 need to be slid upwards and rotated to one side to prevent the measuring disc 304 from interfering with the installation of the inner shaft of the pump body; after the inner shaft of the pump body is installed, the user rotates the measuring disc 304 so that it is located directly above the rotating cylinder 2, and then slides downward to adjust the height of the measuring disc 304, the bracket and the measuring device 305 so that the contact at the bottom of the measuring device 305 contacts the top of the inner shaft of the pump body, and then drives the inner shaft of the pump body to rotate for a simulation test process. The measuring device 305 outputs the acquired data in real time, and the data is processed by the equipped processing equipment to determine the axial fluctuation of the shaft end of the inner shaft of the pump body during operation. The above data and the axial length of the inner shaft of the pump body measured by the caliper are used as measurement data to determine whether the inner shaft of the pump body meets the requirements.

[0069] In one embodiment, the support system includes: side frames 301 and vertical members.

[0070] The side frame 301 is fixedly installed on the outer side surface of the first cylinder 101 along the radial direction of the first cylinder 101. The vertical rod includes an integrally arranged fixing column 302 and a screw column 303. The bottom end of the fixing column 302 is fixedly connected to the side frame 301, and the bottom end of the screw column 303 is fixedly connected to the top end of the fixing column 302. The top nut member 3010 and the bottom nut member 309 are both threadedly matched with the screw column 303.

[0071] In one embodiment, the housing member includes: a first housing 306 , a second housing 3012 , a stand 3011 , a frame 3014 , a sliding rod 3015 , an elastic block 3016 and a pull rod 3017 .

[0072] A sliding hole 307 is provided at the top of the first frame 306. The first frame 306 and the measuring disk 304 are integrally arranged. The second frame 3012 is arranged parallel to the first frame 306, and the second frame 3012 is fixedly connected to the top of the first frame 306 through the vertical frame 3011. The combined structure of the first frame 306, the second frame 3012 and the vertical frame 3011 can ensure the stability of the measuring disk 304 sliding up and down.

[0073] The first bracket 306 is provided with a first notch 308 on its side, and a first notch 308 on its side is provided with a first notch 308 on its side. The first notch 306 is provided with a first notch 308 on its side, and a first notch 308 on its side is provided with a first notch 308 on its side.

[0074] When in use, the user operates the pull rod 3017 to pull outward, driving the sliding rod 3015 to slide outward, one end of the sliding rod 3015 squeezes the elastic block 3016, and the sliding rod 3015 leaves the rectangular notch 308. At this time, the sleeve and the measuring disk 304 can rotate around the screw column 303. After the shaft in the pump body is placed, the user rotates the measuring disk 304. When the measuring disk 304 is directly above the rotating cylinder 2, under the action of the elastic block 3016, one end of the sliding rod 3015 is pushed into the rectangular notch 308 and can maintain this position.

[0075] In one embodiment, the center position of the top of the tray member 402 is recessed downward to form a center groove 402a, and the center groove 402a is used to position the bottom end of the shaft in the pump body. An annular graphite pad 402b is fixedly installed on the top of the tray member 402. The annular graphite pad 402b has wear-resistant and lubricating effects to ensure the smooth rotation of the shaft in the pump body.

[0076] In one embodiment, the annular counterweight 404 includes: an annular body 40401 , a flange portion 40402 , a counterweight block 40403 and an electromagnetic ring 40404 .

[0077] Several parallel flange parts 40402 are fixedly connected to the outer side of the annular body 40401, and a counterweight area 404a is formed between two adjacent flange parts 40402. A counterweight block 40403 is installed inside the counterweight area 404a, and an electromagnetic ring 40404 is fixedly installed on the top of the uppermost flange part 40402. Generally, the inner shaft of the pump body is made of metal. The electromagnetic ring 40404 can be adsorbed on the bottom of the inner shaft of the pump body when energized. The overall weight of the annular body 40401, flange part 40402, counterweight block 40403 and electromagnetic ring 40404 applies a downward pulling force to the inner shaft of the pump body.

[0078] In one embodiment, the counterweight block 40403 is formed into a ring structure by a plurality of independent arc-shaped blocks, which facilitates the installation / replacement of the counterweight block 40403.

[0079] Example 2:

[0080] This embodiment provides a method for dynamically detecting the axial clearance of the inner shaft of a pump body, using a dynamic detection device for the axial clearance of the inner shaft of a pump body in the first embodiment, and specifically comprising the following steps:

[0081] S1, in the detection preparation state, the lifting member 401 of the lifting-counterweight assembly 4 is controlled to be in the retracted state;

[0082] During testing, the inner shaft of the pump body is placed inside the rotating cylinder 2, and the bottom shaft head of the inner shaft of the pump body is supported by the tray component 402, and the top of the annular counterweight 404 contacts the bottom of the inner shaft of the pump body. The suction cup assembly is controlled to work so that the annular counterweight 404 is sucked onto the inner shaft of the pump body, and then the lifting component 401 is controlled to rise, driving the inner shaft of the pump body and the annular counterweight 404 to move upward synchronously, and the weight of the annular counterweight 404 is used to apply downward pressure to the inner shaft of the pump body.

[0083] S2. Control the rotating drum 2 to rotate, and the rotating drum 2 drives the shaft inside the pump body to rotate; at the same time, the measuring mechanism 3 detects the axial displacement of the top end of the shaft inside the pump body.

[0084] Whether the size of the inner shaft of the pump body is qualified is judged based on the statically measured shaft length of the pump body and the axial displacement fluctuation of the top end of the inner shaft of the pump body measured by the above-mentioned measuring mechanism 3.

[0085] While 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 these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A dynamic detection device for the axial clearance of the inner shaft of a pump body, characterized in that: include: A cylindrical base (1), wherein the bottom end of the cylindrical base (1) is closed and the top end is open; A rotating cylinder (2), the rotating cylinder (2) being mounted on the top of the cylindrical base (1), and a driving frame (201a) for driving the inner shaft of the pump body to rotate is provided on the inner side of the rotating cylinder (2); A measuring mechanism (3), the measuring mechanism (3) being mounted on the outside of the cylindrical base (1) and used for detecting the axial displacement of the top end of the shaft in the pump body; A lifting-counterweight assembly (4), the lifting-counterweight assembly (4) comprising a lifting member (401), a tray member (402), and an annular counterweight member (404), wherein the bottom end of the lifting member (401) is fixedly mounted on the inner bottom of the cylindrical base (1), the tray member (402) is fixedly mounted on the top telescopic end of the lifting member (401), a limiting frame (403) is fixedly mounted on the outer side of the fixed shell of the lifting member (401), the annular counterweight member (404) is sleeved on the outer side of the lifting member (401), and the annular counterweight member (404) is located above the limiting frame (403), and a suction cup assembly is provided on the top of the annular counterweight member (404).

2. A dynamic detection device for the axial clearance of the inner shaft of a pump body according to claim 1, characterized in that: The cylindrical base (1) comprises: A first cylinder (101), wherein the bottom end of the first cylinder (101) is closed, and a plurality of supporting legs (102) distributed in a circular array are fixedly mounted on the outer side of the first cylinder (101); The top end of the first cylinder (101) extends outward and is fixedly connected to the second cylinder (103).

3. A dynamic detection device for the axial clearance of the inner shaft of a pump body according to claim 2, characterized in that: The rotating drum (2) comprises: A third cylinder (201), wherein the bottom end of the third cylinder (201) is rotatably mounted on the inner side of the second cylinder (103) via a bearing, and a driving frame (201a) is fixedly mounted on the inner side of the third cylinder (201), and the driving frame (201a) is provided in two groups; A motor (203), wherein the motor (203) is fixedly mounted on the outside of the second cylinder (103), and a driving gear (204) is fixedly mounted on the output end of the motor (203); A gear ring (202) is fixedly mounted on the outer side of the third cylinder (201), and the driving gear (204) and the gear ring (202) are meshed with each other.

4. A dynamic detection device for the axial clearance of the inner shaft of a pump body according to claim 2, characterized in that: The measuring mechanism (3) comprises: A support system, the support system being fixedly connected to the outer side surface of the first cylinder (101); A measuring disc (304), a sleeve member is fixedly provided on the side of the measuring disc (304), the sleeve member is slidably connected to the support system along the axial direction of the first cylinder (101), and a top nut member (3010) and a bottom nut member (309) are respectively threadedly installed on the upper and lower ends of the sleeve member on the support system; The measuring disc (304) is located just above the rotating cylinder (2) and is fixedly mounted with at least one measuring device (305).

5. The dynamic detection device for the axial clearance of the inner shaft of a pump body according to claim 4 is characterized in that: The support system includes: A side frame (301) fixedly mounted on the outer side of the first cylinder (101) along the radial direction of the first cylinder (101); The vertical pole piece comprises an integrally arranged fixing column (302) and a screw column (303), the bottom end of the fixing column (302) is fixedly connected to the side frame (301), and the bottom end of the screw column (303) is fixedly connected to the top end of the fixing column (302).

6. A dynamic detection device for the axial clearance of the inner shaft of a pump body according to claim 5, characterized in that: The frame member comprises: A first frame (306), wherein a sliding hole (307) is provided on the top of the first frame (306), and the first frame (306) and the measuring disk (304) are integrally arranged; A second frame (3012), the second frame (3012) is arranged in parallel with the first frame (306), and the second frame (3012) is fixedly connected to the top of the first frame (306) through a stand (3011); A rectangular notch (308) is provided on the side of the screw column (303), a frame-shaped member (3014) is fixedly connected to the first sleeve (306), a sliding rod (3015) is slidably provided on the inner side of the frame-shaped member (3014), one end of the sliding rod (3015) corresponds to the rectangular notch (308), an elastic block (3016) is provided between the other end of the sliding rod (3015) and the stand (3011), a side hole (3013) is provided on the side of the stand (3011), a pull rod (3017) is slidably connected to the side hole (3013), and one end of the pull rod (3017) is hung on the top of the sliding rod (3015).

7. The dynamic detection device for the axial clearance of the inner shaft of a pump body according to claim 1, characterized in that: The center position of the top end of the tray member (402) is recessed downward to form a center groove (402a), and an annular graphite pad (402b) is fixedly mounted on the top end of the tray member (402).

8. The dynamic detection device for the axial clearance of the inner shaft of a pump body according to claim 1 is characterized in that: The annular counterweight (404) comprises: An annular body (40401), wherein a plurality of parallel flanges (40402) are fixedly connected to the outer side of the annular body (40401), and a counterweight region (404a) is formed between two adjacent flanges (40402); A counterweight block (40403) is installed inside the counterweight area (404a); An electromagnetic ring (40404) is fixedly mounted on the top of the uppermost flange portion (40402).

9. The dynamic detection device for the axial clearance of the inner shaft of a pump body according to claim 8, characterized in that: The counterweight block (40403) is composed of a plurality of independent arc-shaped blocks forming an annular structure.

10. A dynamic detection method for the axial clearance of the inner shaft of a pump body, characterized in that: The dynamic detection device for the axial fit clearance of the inner shaft of a pump body according to any one of claims 1 to 9 specifically comprises the following steps: S1. When in the detection preparation state, the lifting member of the lifting-counterweight assembly is controlled to be in the retracted state; During the inspection, the shaft inside the pump body is placed inside the rotating drum, with the bottom end of the shaft inside the pump body supported by the tray, and the top end of the annular counterweight in contact with the bottom of the shaft inside the pump body. The suction cup assembly is controlled to work so that the annular counterweight is sucked onto the shaft inside the pump body. Then the lifting component is controlled to rise, driving the shaft inside the pump body and the annular counterweight to move upward synchronously, and the weight of the annular counterweight applies downward pressure to the shaft inside the pump body. S2. Control the rotation of the rotating cylinder, which drives the shaft inside the pump body to rotate; at the same time, the measuring mechanism detects the axial displacement of the top end of the shaft inside the pump body.

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