A dynamic detection device and method for axial fit clearance of shaft in pump body

Abstract

The application provides a kind of dynamic detection device and method of pump body inner shaft axial fit gap, it is related to dynamic detection axial fit gap technical field, including cylindrical base, rotary cylinder, measuring mechanism and lift-counterweight assembly.The application, by designing cylindrical base, rotary cylinder, measuring mechanism and lift-counterweight assembly, when it detects, based on the downward tension of annular counterweight piece of lift-counterweight assembly to pump body inner shaft, the tension is generated by the weight of annular counterweight piece, in the process that rotary cylinder drives pump body inner shaft to rotate, always keep the stability of tension, its measuring mechanism detects the axial displacement of pump body inner shaft top end, to ensure the accuracy and reliability of detection.

Description

Technical Field

[0001] This invention relates to the field of intelligent sensors, specifically to the field of dynamic detection of axial fit clearance, and more specifically to a dynamic detection device and method for axial fit clearance of a pump body shaft. Background Technology

[0002] As the core component of a fluid transport system, the axial clearance between the pump body's internal rotating shaft and the pump casing directly affects the pump's operating efficiency, vibration noise, and service life. In industrial applications (such as petrochemicals, nuclear power, and ship propulsion), excessive axial clearance leads to increased leakage and decreased efficiency, while insufficient clearance may cause frictional wear or even jamming. Therefore, accurately detecting the axial clearance of the pump body's internal shaft is crucial for ensuring the complete assembly and safe operation of the equipment.

[0003] Traditional methods for detecting axial fit often involve applying pressure from above. For example, patent CN100447402C describes a device for detecting the axial clearance of a pump body shaft in the field of mechanical component testing. This device includes an upper clamping mechanism, a workpiece positioning mechanism, an axial lifting mechanism, and an inner shaft rotation mechanism. The upper clamping mechanism includes a cylinder or hydraulic cylinder, a reference pressure block, a pressing block, a pressing motor, a reducer, a synchronous belt, a clamping rod, a pressing position sensor, and a height measuring sensor. During use, because the height measuring sensor is mounted on the pressing block, and a spring is used above the pressing block to balance the pressure, fluctuations in the axial clearance during testing cause fluctuations in the pressure of the pressing block, thus compromising the accuracy of the detection. Therefore, this invention provides a dynamic detection device and method for the axial fit clearance of a pump body shaft. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a dynamic detection device and method for the axial clearance of the pump body shaft, which solves the problem that axial clearance fluctuations during the detection process cause fluctuations in the pressure of the pressed block, thus compromising the accuracy of the detection.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

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

[0007] A cylindrical base, wherein the bottom end of the cylindrical base is closed and the top end is open;

[0008] A rotating cylinder is mounted on top of a cylindrical base, and a drive frame for driving the internal shaft of the pump body to rotate is provided on the inner side of the rotating cylinder.

[0009] A measuring mechanism, installed on the outside of the cylindrical base, is used to detect the axial displacement of the top end of the shaft inside the pump body;

[0010] The lifting-weight assembly comprises a lifting member, a tray member and a ring-shaped weight member, the bottom end of the lifting member is fixedly installed at the inner bottom of the cylindrical base, the tray member is fixedly installed at the telescopic end of the top of the lifting member, the outer side of the fixed shell of the lifting member is fixedly installed with a limiting frame, the ring-shaped weight member is sleeved on the outer side of the lifting member and is located above the limiting frame, and the top end of the ring-shaped weight member is provided with a suction disc assembly.

[0011] Preferably, the cylindrical base comprises:

[0012] A first cylinder, the bottom end of which is closed, and the outer side of which is fixedly installed with a plurality of ring-shaped arrayed foot supports;

[0013] The top end of the first cylinder is fixedly connected with a second cylinder which extends outward.

[0014] Preferably, the rotating cylinder comprises:

[0015] A third cylinder, the bottom end of which is rotatably installed at the inner side of the second cylinder through a bearing, and a driving frame is fixedly installed at the inner side of the third cylinder, the driving frame is provided with two groups;

[0016] A motor, the output end of which is fixedly installed with a driving gear, is fixedly installed at the outer side of the second cylinder.

[0017] The outer side of the third cylinder is fixedly installed with a gear ring, and the driving gear and the gear ring are mutually engaged.

[0018] Preferably, the measuring mechanism comprises:

[0019] A support system, the outer side of which is fixedly connected with the first cylinder;

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

[0021] At least one measurer is fixedly installed above the rotating cylinder.

[0022] Preferably, the support system comprises:

[0023] A side frame which is fixedly installed at the outer side of the first cylinder along the radial direction of the first cylinder;

[0024] A vertical rod member, the vertical rod member comprises a fixed column and a screw column which are integrally arranged, the bottom end of the fixed column is fixedly connected with the side frame, and the bottom end of the screw column is fixedly connected at the top end of the fixed column.

[0025] Preferably, the sleeve frame comprises:

[0026] The first sleeve frame is provided with a sliding hole at the top, and the first sleeve frame is integrally arranged with the measuring disc;

[0027] The second sleeve frame is arranged in parallel with the first sleeve frame, and the second sleeve frame is fixedly connected to the top of the first sleeve frame through the stand;

[0028] The side surface of the screw column is provided with a rectangular notch, the first sleeve frame is fixedly connected with a frame-shaped part, the inner side of the frame-shaped part is slidingly provided with a sliding insertion rod, one end of the sliding insertion rod corresponds to the rectangular notch, and the other end of the sliding insertion rod is provided with an elastic block between the stand; the side surface of the stand is provided with a side hole, a pull rod is slidingly connected to the side hole, and one end of the pull rod is hung to the top of the sliding insertion rod.

[0029] Preferably, the top end of the tray part is recessed downward at the center position to form a center groove, and the top end of the tray part is fixedly installed with an annular graphite pad.

[0030] Preferably, the annular counterweight part comprises:

[0031] The outer side of the annular body is fixedly connected with a plurality of flange parts distributed in parallel, and a counterweight area is formed between adjacent two flange parts;

[0032] The counterweight block is installed in the inside of the counterweight area;

[0033] The top of the uppermost flange part is fixedly installed with an electromagnetic ring.

[0034] Preferably, the counterweight block is composed of a plurality of independent arc-shaped blocks to form an annular structure.

[0035] A dynamic detection method for the axial fitting gap of a pump body inner shaft, using the dynamic detection device for the axial fitting gap of a pump body inner shaft, specifically comprising the following steps:

[0036] S1, when the detection preparation state is detected, the lifting part of the lifting-counterweight assembly is in the retracted state;

[0037] When detecting, the pump body inner shaft is placed in the inside of the rotating cylinder, the bottom end shaft head of the pump body inner shaft is supported by the tray part, and the top end of the annular counterweight part is in contact with the bottom of the pump body inner shaft; the suction cup assembly is controlled to work, so that the annular counterweight part is sucked on the pump body inner shaft, then the lifting part is controlled to rise, and the pump body inner shaft and the annular counterweight part are driven to move upward synchronously, and the self-weight of the annular counterweight part is used to exert downward pressure on the pump body inner shaft;

[0038] S2, the rotating cylinder is controlled to rotate, the rotating cylinder drives the pump body inner shaft to rotate; and the measuring mechanism detects the axial displacement of the top end of the pump body inner shaft.

[0039] The application provides a dynamic detection device and method for an axial fit gap of a pump body inner shaft.

[0040] 1. The application, by designing the cylindrical base, the rotating cylinder, the measuring mechanism and the lifting-counterweight assembly, when detecting, the annular counterweight of the lifting-counterweight assembly exerts a downward pulling force on the pump body inner shaft, the pulling force is generated by the weight of the annular counterweight, and in the process of driving the pump body inner shaft to rotate by the rotating cylinder, the stability of the pulling force is always maintained, the measuring mechanism detects the axial displacement of the top end of the pump body inner shaft, so that the accuracy and reliability of detection are ensured.

[0041] 2. The application, by designing the cylindrical base, the rotating cylinder, the measuring mechanism and the lifting-counterweight assembly, the pump body inner shaft can be detected alone, without the cooperation of the pump body, the bearing and the flange and other structures to simulate the actual working condition, the measuring process is simple, and the measuring efficiency is high. BRIEF DESCRIPTION OF DRAWINGS

[0042] Figure 1 It is a perspective view of a dynamic detection device for an axial fit gap of a pump body inner shaft provided by the application;

[0043] Figure 2 It is a front view of a dynamic detection device for an axial fit gap of a pump body inner shaft provided by the application;

[0044] Figure 3 It is a side view of a dynamic detection device for an axial fit gap of a pump body inner shaft provided by the application;

[0045] Figure 4 It is a top view of a dynamic detection device for an axial fit gap of a pump body inner shaft provided by the application;

[0046] Figure 5 It is a sectional view of section line A-A in the application; Figure 4

[0047] It is a local enlarged view of B in the application; Figure 6 Figure 5

[0048] Figure 7 It is an installation schematic view of a measuring disc and a measuring device of a dynamic detection device for an axial fit gap of a pump body inner shaft provided by the application;

[0049] Figure 8 It is a perspective schematic view of a rotating cylinder of a dynamic detection device for an axial fit gap of a pump body inner shaft provided by the application;

[0050] Figure 9 ​​This is a three-dimensional schematic diagram of the annular counterweight and the lifting platform of a dynamic detection device for the axial fit clearance of the pump body shaft proposed in this invention.

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

[0052] The components include: 1. Cylindrical base; 101. First cylinder; 102. Support frame; 103. Second cylinder; 2. Rotating cylinder; 201. Third cylinder; 201a. Drive frame; 202. Gear ring; 203. Motor; 204. Drive gear; 3. Measuring mechanism; 301. Side frame; 302. Fixed column; 303. Screw column; 304. Measuring disc; 305. Measuring instrument; 306. First set; 307. Sliding hole; 308. Rectangular notch; 309. Bottom nut; 3010. Top nut. 3011, Upright frame; 3012, Second set of frames; 3013, Side hole; 3014, Frame-type component; 3015, Sliding rod; 3016, Elastic block; 3017, Tie rod; 4, Lifting-counterweight assembly; 401, Lifting component; 402, Pallet component; 402a, Center groove; 402b, Annular graphite pad; 403, Limiting frame; 404, Annular counterweight component; 404a, Counterweight area; 40401, Annular body; 40402, Flange; 40403, Counterweight block; 40404, Electromagnetic ring. Detailed Implementation

[0053] 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.

[0054] Example 1:

[0055] like Figures 1-10 As shown in the figure, the dynamic detection device for the axial fit clearance of the pump body shaft provided by the embodiment of the present invention is in the field of intelligent sensors. It is used to dynamically detect the axial fit clearance to ensure the complete assembly and safe operation of the fuel pump of the equipment. Specifically, it 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 at the top of the cylindrical base 1, and the inner side of the rotating cylinder 2 is provided with a driving frame 201a for driving the pump body inner shaft to rotate. During use, the rotating cylinder 2 rotates (relative to the cylindrical base 1), and the driving frame 201a drives the pump body inner shaft to rotate, simulating the dynamic rotation of the pump body inner shaft. The measuring mechanism 3 is installed on the outer side of the cylindrical base 1 and is used for detecting the axial displacement of the top end of the pump body inner shaft. The core component of the measuring mechanism 3 is a contact / non-contact distance measuring device, such as an electronic dial gauge, 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 and is used for supporting the pump body inner shaft and applying a stable downward pulling force to the pump body inner shaft.

[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 telescopic rod. The bottom end of the lifting member 401 is fixedly installed at the inner bottom of the cylindrical base 1. The tray member 402 is fixedly installed at the top telescopic end of the lifting member 401. The tray member 402 is used for supporting the bottom end of the pump body inner shaft and keeping the axis of the pump body inner shaft consistent with the center line of the lifting-counterweight assembly 4. A limiting frame 403 is fixedly installed 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 is located above the limiting frame 403. The limiting frame 403 is used for supporting the annular counterweight member 404. The top end of the annular counterweight member 404 is provided with a suction cup assembly, which is an electromagnetic suction cup or a vacuum suction cup and is used for fixedly connecting the annular counterweight member 404 to the bottom end of the pump body inner shaft.

[0058] During use, the pump body inner shaft is placed in the interior of the rotating cylinder 2 and the bottom end shaft head of the pump body inner shaft is supported by the tray member 402. At this time, the top end of the annular counterweight member 404 contacts the bottom of the pump body inner shaft. The suction cup assembly is controlled to work and make the annular counterweight member 404 suck on the pump body inner shaft. Then the lifting member 401 is controlled to rise, driving the pump body inner shaft and the annular counterweight member 404 to move upward synchronously, and the self-weight of the annular counterweight member 404 is used to apply a downward pressure to the pump body inner shaft. Then the rotating cylinder 2 is controlled to rotate, driving the pump body inner shaft to rotate, and at the same time, the measuring mechanism 3 detects the axial displacement of the top end of the pump body inner shaft.

[0059] The mechanism of the above process detection is as follows: the appropriate pressure between one end of the pump body inner shaft and the end of the sealing plate / bearing inner ring is ensured, the axial gap of the other end of the pump body inner shaft and the fluctuation of the axial gap are measured, and thus the gap condition of the pump body inner shaft during actual use is judged. Therefore, if necessary, one pump body inner shaft needs to be tested twice in positive and reverse directions.

[0060] The design of the cylindrical base 1, the rotating cylinder 2, the measuring mechanism 3 and the lifting-counterweight assembly 4, when detecting, the annular counterweight 404 of the lifting-counterweight assembly 4 exerts a downward pulling force on the pump body inner shaft, the pulling force is generated by the weight of the annular counterweight 404, during the rotation of the rotating cylinder 2 driving the pump body inner shaft, the stability of the pulling force is always maintained, the measuring mechanism 3 detects the axial displacement of the top end of the pump body inner shaft, thereby ensuring the accuracy and reliability of the detection.

[0061] In an embodiment, the cylindrical base 1 comprises: a first cylinder 101, a foot support 102 and a second cylinder 103.

[0062] The bottom end of the first cylinder 101 is closed, and a plurality of annularly arranged foot supports 102 are fixedly installed on the outer side of the first cylinder 101, the foot supports 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 outwardly and is fixedly connected with 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, and the first cylinder 101, the foot support 102 and the second cylinder 103 are integrally cast.

[0063] In an embodiment, the rotating cylinder 2 comprises: a third cylinder 201, a driving frame 201a, a motor 203, a driving gear 204 and a gear ring 202.

[0064] The bottom end of the third cylinder 201 is rotatably installed 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 installed on the inner side of the third cylinder 201, the driving frame 201a is provided with two groups, generally the protruding part of the pump body inner shaft (cam) is aligned between the two groups of driving frames 201a, so that the third cylinder 201 can stably drive the pump body inner shaft to rotate, the motor 203 is fixedly installed on the outer side of the second cylinder 103, and the output end of the motor 203 is fixedly installed with the driving gear 204, the outer side of the third cylinder 201 is fixedly installed with the gear ring 202, the driving gear 204 and the gear ring 202 are meshed with each other, and the transmission between the driving gear 204 and the gear ring 202 is deceleration transmission.

[0065] In use, the motor 203 is connected to the power supply, the output shaft of the motor 203 drives the driving gear 204 to rotate, the driving gear 204 and the gear ring 202 are meshed with each other, thereby driving the gear ring 202 to rotate, the gear ring 202 and the third cylinder 201 are fixed, the gear ring 202 and the third cylinder 201 rotate synchronously, and the driving frame 201a on the inner side of the third cylinder 201 drives the pump body inner shaft to rotate.

[0066] In an embodiment, the measuring mechanism 3 comprises a support system, a measuring disc 304, a sleeve piece and a measurer 305.

[0067] The support system is vertically arranged and fixedly connected to the outer side of the first cylinder 101, and is used for mounting the measuring disc 304, the sleeve piece and the measurer 305. The side of the measuring disc 304 is fixedly provided with the sleeve piece, and the sleeve piece is slidably connected to the support system along the axial direction of the first cylinder 101. The top and bottom ends of the support system and located above and below the sleeve piece are respectively threadedly mounted with a top nut piece 3010 and a bottom nut piece 309. By adjusting the top nut piece 3010 and the bottom nut piece 309, the height position of the measuring disc 304 and the sleeve piece can be adjusted. After adjustment, the measuring disc 304 and the sleeve piece are fixed by the top nut piece 3010 and the bottom nut piece 309. The measuring disc 304 is fixedly mounted with at least one measurer 305 above the rotating cylinder 2. The measurer 305 is preferably an electronic percentage meter, and its measuring structure is accurate and reliable.

[0068] When placing the pump body shaft, the measuring disc 304, the sleeve piece and the measurer 305 need to be slid upward and turned to one side to avoid interference with the installation of the pump body shaft. After the pump body shaft is installed, the user turns the measuring disc 304 to be above the rotating cylinder 2, and then adjusts the height of the measuring disc 304, the sleeve piece and the measurer 305 downward to make the contact at the bottom of the measurer 305 contact the top end of the pump body shaft. Then the pump body shaft is driven to rotate for simulation test. The measurer 305 outputs the data in real time, which is processed by the processing device to determine the axial fluctuation of the shaft end of the pump body shaft during operation. The above data and the axial length of the pump body shaft measured by the caliper are used as measurement data to determine whether the pump body shaft meets the requirements.

[0069] In an embodiment, the support system comprises a side frame 301 and a vertical rod piece.

[0070] The side frame 301 is fixedly installed on the outer side of the first cylinder 101 along the radial direction of the first cylinder 101. The vertical rod piece comprises a fixed column 302 and a screw column 303 which are integrally arranged. The bottom end of the fixed 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 fixed column 302. The top nut piece 3010 and the bottom nut piece 309 are threadedly connected to the screw column 303.

[0071] In an embodiment, the sleeve piece comprises a first sleeve 306, a second sleeve 3012, a vertical frame 3011, a frame-shaped piece 3014, a sliding insertion rod 3015, an elastic block 3016 and a pull rod 3017.

[0072] The top of the first sleeve 306 is provided with a sliding hole 307, the first sleeve 306 is integrally arranged with the measuring disc 304, the second sleeve 3012 is arranged in parallel with the first sleeve 306, and the second sleeve 3012 is fixedly connected to the top of the first sleeve 306 through the stand 3011. The combination of the first sleeve 306, the second sleeve 3012 and the stand 3011 can ensure the stability of the up-and-down sliding of the measuring disc 304.

[0073] The side of the screw column 303 is provided with a rectangular notch 308, the first sleeve 306 is fixedly connected with a frame-shaped piece 3014, the bottom of the frame-shaped piece 3014 forms a sliding channel with the upper portion of the first sleeve 306, the inner side of the frame-shaped piece 3014 is slidingly provided with a sliding plug 3015, one end of the sliding plug 3015 corresponds to the rectangular notch 308, when the one end of the sliding plug 3015 is inserted into the inside of the rectangular notch 308, the measuring disc 304 can be located directly above the rotating cylinder 2, the other end of the sliding plug 3015 is provided with an elastic block 3016 between the sliding plug 3015 and the stand 3011, the elastic block 3016 pushes the sliding plug 3015 to slide towards the other end, the side of the stand 3011 is provided with a side hole 3013, a pull rod 3017 is slidingly connected to the side hole 3013, one end of the pull rod 3017 is hung to the top of the sliding plug 3015, and the other end of the pull rod 3017 is provided with an arc-shaped handle.

[0074] When in use, the user pulls the pull rod 3017 outward, drives the sliding plug 3015 to slide outward, the one end of the sliding plug 3015 presses the elastic block 3016, and the sliding plug 3015 leaves the rectangular notch 308, at this time, the sleeve piece and the measuring disc 304 can rotate around the screw column 303. After the pump body inner shaft is placed, the user rotates the measuring disc 304, when the measuring disc 304 is located directly above the rotating cylinder 2, the one end of the sliding plug 3015 is inserted into the inside of the rectangular notch 308 under the action of the elastic block 3016, and this position can be maintained.

[0075] In an embodiment, the top end of the tray piece 402 is recessed downward at the center position to form a center groove 402a, the center groove 402a is used for positioning the bottom end shaft head of the pump body inner shaft, and the top end of the tray piece 402 is fixedly installed with an annular graphite pad 402b, the annular graphite pad 402b has the functions of wear resistance and lubrication, and can ensure the stability of the rotation of the pump body inner shaft.

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

[0077] The outer side of the annular body 40401 is fixedly connected with a plurality of parallel flange portions 40402, a counterweight area 404a is formed between adjacent two flange portions 40402, a counterweight block 40403 is installed in the counterweight area 404a, the top of the uppermost flange portion 40402 is fixedly installed with an electromagnetic ring 40404, the inner shaft of the pump body is generally made of metal, the electromagnetic ring 40404 can be adsorbed on the bottom of the inner shaft of the pump body when electrified, and the downward pulling force of the entire annular body 40401, the flange portion 40402, the counterweight block 40403 and the electromagnetic ring 40404 is applied to the inner shaft of the pump body.

[0078] In an embodiment, the counterweight block 40403 is composed of a plurality of independent arc-shaped blocks to form a ring structure, so as to facilitate the installation / replacement of the counterweight block 40403.

[0079] Embodiment two:

[0080] The embodiment provides a kind of dynamic detection method of pump body inner shaft axial fit gap, using the dynamic detection device of pump body inner shaft axial fit gap in embodiment one, specifically includes the following steps:

[0081] S1, when detecting preparation state, the lifting piece 401 of the lifting-counterweight assembly 4 is in retracted state;

[0082] When detecting, the inner shaft of the pump body is placed in the inside of the rotating cylinder 2, the bottom end shaft head of the inner shaft of the pump body is supported by the tray piece 402, and the top end of the annular counterweight piece 404 is in contact with the bottom of the inner shaft of the pump body, the suction cup assembly is controlled to work, so that the annular counterweight piece 404 is adsorbed on the inner shaft of the pump body, then the lifting piece 401 is controlled to rise, drives the inner shaft of the pump body and the annular counterweight piece 404 to move upward synchronously, and the self weight of the annular counterweight piece 404 is applied to the inner shaft of the pump body to exert downward pressure.

[0083] S2, the rotating cylinder 2 is controlled to rotate, and the rotating cylinder 2 drives the inner shaft of the pump body to rotate; simultaneously, the measuring mechanism 3 detects the axial displacement of the top end of the inner shaft of the pump body.

[0084] Based on the static measurement, whether the size of the inner shaft of the pump body is qualified is judged according to the fluctuation of the axial displacement of the top end of the inner shaft of the pump body measured by the measuring mechanism 3.

[0085] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A device for dynamic detection of an axial fit clearance of a shaft in a pump body, characterized in that The utility model relates to a kind of pump body, including: Cylindrical base (1), the bottom end of the cylindrical base (1) is closed, top end is opened; Rotary cylinder (2), the rotary cylinder (2) is installed at the top of cylindrical base (1), and the inner side of rotary cylinder (2) is provided with drive frame (201a) for driving pump body inner shaft rotation; Measuring mechanism (3), the measuring mechanism (3) is installed on the outside of cylindrical base (1), for detecting the axial displacement of pump body inner shaft top end; Lifting-weight assembly (4), the lifting-weight assembly (4) includes lifting piece (401), tray piece (402), annular counterweight (404), the bottom end of the lifting piece (401) is fixedly installed in the inner bottom of cylindrical base (1), the tray piece (402) is fixedly installed in the telescopic end of the top of lifting piece (401), the outer side of the fixed shell of lifting piece (401) is fixedly installed with limiting frame (403), the annular counterweight (404) is sleeved on the outer side of lifting piece (401), and the annular counterweight (404) is located above limiting frame (403), and the top end of annular counterweight (404) is provided with suction disc assembly;Suction disc assembly is electromagnetic suction disc or vacuum suction disc, which is used for fixing and connecting annular counterweight (404) at the bottom end of pump body inner shaft.

2. The dynamic detection device for the shaft axial fit gap in the pump body according to claim 1, characterized in that, The cylindrical base (1) includes: First cylinder (101), the bottom end of the first cylinder (101) is closed, and a plurality of annular array distribution's supporting frame (102) is fixedly installed on the outer side of first cylinder (101); The top end of the first cylinder (101) is fixedly connected with the second cylinder (103) outwardly extended.

3. The dynamic detection device for the shaft axial fit gap in a pump body according to claim 2, characterized in that, The rotary cylinder (2) includes: Third cylinder (201), the bottom end of the third cylinder (201) is rotatably installed on the inner side of second cylinder (103) through bearing, and drive frame (201a) is fixedly installed on the inner side of third cylinder (201), and the drive frame (201a) is provided with two groups; Motor (203), the motor (203) is fixedly installed on the outer side of second cylinder (103), and the output end of motor (203) is fixedly installed with driving gear (204); The outer side of the third cylinder (201) is fixedly installed with gear ring (202), and the driving gear (204) is engaged with the gear ring (202).

4. The dynamic detection device for the shaft axial fit gap in a pump body according to claim 2, characterized in that, The measuring mechanism (3) includes: Support system, the support system is fixedly connected with the outer side of the first cylinder (101); Measuring disc (304), the side of the measuring disc (304) is fixedly provided with sleeve frame, the sleeve frame is slidably connected with the support system along the axial direction of the first cylinder (101), and the top nut (3010) and the bottom nut (309) are respectively screwed on the upper and lower ends of the sleeve frame on the support system; At least one measurer (305) is fixedly installed above the rotary cylinder (2) position of the measuring disc (304).

5. The apparatus for dynamic detection of the shaft axial fit clearance in the pump body according to claim 4, characterized in that The support system includes: Side frame (301) is fixedly installed on the outer side of the first cylinder (101) along the radial direction of the first cylinder (101); The vertical rod piece comprises a fixed column (302) and a screw rod column (303) which are integrally arranged, the bottom end of the fixed column (302) is fixedly connected with the side frame (301), and the bottom end of the screw rod column (303) is fixedly connected with the top end of the fixed column (302).

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

7. The dynamic detection device for the shaft axial fit gap in a pump body according to claim 1, characterized in that: The top end of the tray piece (402) is recessed downward at the central position to form a central groove (402a), and the top end of the tray piece (402) is fixedly installed with an annular graphite pad (402b).

8. The apparatus for dynamic detection of an axial fit clearance of a shaft in a pump body according to claim 1, wherein The annular counterweight piece (404) comprises: An annular body (40401) which is fixedly connected with a plurality of flange portions (40402) which are arranged in parallel on the outer side of the annular body (40401), and a counterweight area (404a) is formed between adjacent two flange portions (40402); The counterweight area (404a) is internally installed with a counterweight block (40403); The top of the uppermost flange portion (40402) is fixedly installed with an electromagnetic ring (40404).

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

10. A method of dynamic detection of shaft axial fit clearance in a pump body, characterized by, The dynamic detection device for the axial gap of the pump body inner shaft according to any one of claims 1-9 comprises the following steps: S1, when the detection preparation state is detected, the lifting part of the lifting-counterweight assembly is in the retracted state; When the pump body inner shaft is placed in the inner part of the rotating cylinder, the bottom end shaft head of the pump body inner shaft is supported by the tray piece, the top end of the annular counterweight piece is in contact with the bottom of the pump body inner shaft, the suction disc assembly is controlled to work, the annular counterweight piece is sucked on the pump body inner shaft, then the lifting part is controlled to rise, the pump body inner shaft and the annular counterweight piece are driven to move upward synchronously, and the self weight of the annular counterweight piece is used to apply downward pressure to the pump body inner shaft; S2, the rotating cylinder is controlled to rotate, the rotating cylinder drives the pump body inner shaft to rotate, and the measuring mechanism detects the axial displacement of the top end of the pump body inner shaft.

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