Submersible motor overturning and clamping device for well

By using a rotating shaft and clamping frame to adjust the horizontal or vertical position of the submersible motor through a flip-clamping device, the problems of cumbersome operation and safety hazards during assembly are solved, thereby improving assembly efficiency and safety.

CN223719376UActive Publication Date: 2025-12-26HAICHENG SANYU PUMP IND CO LTD
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Patent Information

Application Number
CN202520262521.8
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-02-19
Publication Date
2025-12-26
Estimated Expiration
2035-02-19

AI Technical Summary

Technical Problem

During the assembly process of submersible motors for wells, operators need to place them horizontally or vertically on the operating platform, which is cumbersome and poses a risk of tipping over, resulting in damage to parts and safety hazards.

Method used

A well submersible motor tilting and clamping device was designed. Through the cooperation of a fixed base, a rotating shaft, a clamping frame and a compensating component, an external power source is used to drive the rotating shaft to rotate, which causes the clamping frame and the submersible motor to shift, thereby achieving adjustment of the horizontal or vertical state and preventing tipping.

Benefits of technology

The assembly process of submersible motors for wells has been simplified, preventing the motor from tipping over, reducing damage to parts and safety hazards, and improving the convenience and safety of operation.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model provides an overturning and clamping device for a submersible motor for a well, and the device comprises a fixed seat which is symmetrically provided with two limiting holes in a transverse axis; the rotating shaft is connected with the two limiting holes of the fixed seat through bearings, and the output end of the rotating shaft is provided with a connecting piece; the utility model relates to the technical field of overturning and clamping devices, the rotating shaft is driven to rotate under the driving of an external power source, the rotating shaft drives the clamping frame and a submersible motor in the clamping frame to deviate through the connecting piece, and the submersible motor is driven to rotate through the clamping frame. The submersible motor is adjusted to be in a horizontal or vertical state, the placement position of the submersible motor for the well during assembly is conveniently changed to assist in assembly of the submersible motor, and by clamping the submersible motor, the submersible motor is prevented from toppling and hurting operators.
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Description

TECHNICAL FIELD

[0001] The utility model relates to overturn clamping device technical field especially is involved in a kind of well submersible motor overturn clamping device. BACKGROUND

[0002] Well submersible motor is used to drive submersible pump to extract underground water in deep well, and during the assembly of well submersible motor, component assembly operation needs to be carried out at both ends of well submersible motor;

[0003] At this time, the operator completes the horizontal and upright placement of the well submersible motor on the operation platform, which is troublesome, and the well submersible motor is prone to fall during assembly, causing damage to the parts and injury to the operator, and there is a safety hazard. SUMMARY

[0004] The utility model discloses a kind of well submersible motor overturn clamping devices, to solve the process operation troublesome problem that operator needs to complete the horizontal and upright placement of well submersible motor on operation platform during the assembly of well submersible motor.

[0005] The utility model provides a kind of well submersible motor overturn clamping device, comprising:

[0006] The fixed seat is symmetrically provided with two limiting holes on the transverse axis thereof;

[0007] Rotary shaft, the rotary shaft is connected with the two limiting holes of the fixed seat by bearing, and the output end of the rotary shaft is provided with a connecting piece;

[0008] Clamping frame, the clamping frame is connected with the rotary shaft by the connecting piece, and the rotary shaft is used to drive the clamping frame to rotate, so as to adjust the clamping frame to be in horizontal state or vertical state, the clamping frame is machined with a through slot matched with well submersible motor, and the side away from the rotary shaft of the clamping frame is machined with an opening;

[0009] The clamping frame includes groove plates, and the two groove plates are symmetrically distributed based on the opening of the clamping frame.

[0010] The opening of the clamping frame is provided with a compensation piece, and the compensation piece is used to reduce the through slot of the clamping frame, so as to fix well submersible motor of different sizes in the through slot of the clamping frame.

[0011] Preferably, the compensation piece comprises:

[0012] A plug-in plate is located between two groove plates, and the plug-in plate is connected with the two groove plates by a locking piece, and an end of the plug-in plate away from the locking piece extends into a through groove of the clamping frame.

[0013] A compensation plate is fixedly connected with an end of the plug-in plate extending into the through groove of the clamping frame, and the compensation plate is located in the through groove of the clamping frame.

[0014] Preferably, the connecting piece comprises:

[0015] A limiting convex plate is fixedly connected with an output end of the rotating shaft.

[0016] A mounting concave plate is fixedly connected with the clamping frame, a groove of the mounting concave plate is matched with a convex part of the limiting convex plate, and the mounting concave plate is connected with the limiting convex plate by a connecting screw rod.

[0017] The connecting screw rods are uniformly distributed along the mounting concave plate.

[0018] Preferably, an angle adjusting piece is mounted at a top end of the fixing base, and the angle adjusting piece is used for adjusting a rotation angle of the rotating shaft.

[0019] The angle adjusting piece comprises:

[0020] A cover plate is fixedly connected with the top end of the fixing base, and the cover plate is provided with a limiting sliding groove.

[0021] A sliding seat is slidingly connected with the limiting sliding groove of the cover plate, and the sliding seat is provided with a cylindrical pin.

[0022] A protractor is fixedly connected with the rotating shaft at a center hole of the protractor, and the protractor is uniformly provided with a plurality of circular holes matched with the cylindrical pin.

[0023] Preferably, a guide piece is mounted in the limiting sliding groove of the cover plate, and the guide piece is used for restricting a moving direction of the sliding seat in the limiting sliding groove of the cover plate.

[0024] The guide piece comprises a guide rod and an elastic piece.

[0025] The guide rod is fixedly connected in the limiting sliding groove of the cover plate, the guide rod is slidingly connected with the sliding seat, the elastic piece is sleeved on an outer periphery of the guide rod, and the elastic piece is located between the sliding seat and an inner edge of the limiting sliding groove of the cover plate.

[0026] Preferably, the elastic piece is a compression spring.

[0027] Preferably, the guide rods are symmetrically distributed based on the sliding seat.

[0028] Preferably, the bottom end of the fixed seat is provided with a horizontal moving part;

[0029] The horizontal moving part comprises a base and a sliding plate;

[0030] The base is located at the bottom end of the fixed seat, the sliding plate is in sliding connection with the base, and the side, away from the base, of the sliding plate is in fixed connection with the fixed seat;

[0031] The base is provided with a positioning pin, and the base is connected with the fixed seat through the positioning pin.

[0032] Preferably, the locking part comprises a screw rod and a nut;

[0033] The screw rod is located in the sliding groove of the groove plate, one end of the screw rod is in fixed connection with the plug-in plate, and the other end of the screw rod is in threaded connection with the nut.

[0034] Preferably, the inner wall of the compensation plate is uniformly distributed with rubber blocks.

[0035] The utility model provides a well submersible motor overturns clamping device:

[0036] Through the cooperation of the fixed seat, the rotating shaft, the clamping frame and the compensation part, the submersible motor is fixed in the clamping frame by the compensation part, in the assembling process, the rotating shaft is driven to rotate under the driving of the external power source, the rotating shaft drives the clamping frame and the submersible motor in the clamping frame to deviate through the connecting piece, the submersible motor is adjusted to the horizontal or vertical state, the placing position of the well submersible motor during assembling is changed, the submersible motor is assembled, and the submersible motor is clamped, so that the submersible motor is prevented from falling and bruising the operator. BRIEF DESCRIPTION OF DRAWINGS

[0037] In order to more clearly illustrate the specific embodiment of the utility model or the technical scheme in the prior art, the drawings needed in the specific embodiment or the prior art description will be briefly introduced below, and obviously, the drawings in the following description are some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating creative labor.

[0038] Figure 1 It is a structural schematic diagram of the utility model;

[0039] Figure 2 It is Figure 1 It is a structural schematic diagram of the fixed seat, the rotating shaft and the connecting piece in the utility model;

[0040] Figure 3 It is Figure 1 It is a structural schematic diagram of the fixed seat, the base, the positioning pin and the sliding plate in the utility model;

[0041] Figure 4 For Figure 1 Structure diagram of the clamping frame, the plug-in plate and the compensation plate;

[0042] Figure 5 For Figure 1 Structure diagram of the cover plate, the guide rod, the elastic member and the sliding seat.

[0043] Explanation of reference signs:

[0044] 1-fixed seat;

[0045] 11-angle adjusting member, 111-cover plate, 112-sliding seat, 112a-cylindrical pin, 113-guide member, 113a-guide rod, 113b-elastic member, 114-graduated disc,

[0046] 12-cross moving member, 121-base, 121a-positioning pin, 122-sliding plate;

[0047] 2-rotating shaft,

[0048] 21-connecting member, 211-limiting convex plate, 212-mounting concave plate, 213-connecting screw;

[0049] 3-clamping frame,

[0050] 31-compensation member, 311-plug-in plate, 312-compensation plate, 313-locking member, 313a-screw, 313b-nut;

[0051] 32-groove plate. DETAILED DESCRIPTION

[0052] The technical scheme of the present application will be described clearly and completely in combination with the embodiments. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by the ordinary skilled in the art without creative labor belong to the scope of protection of the present application.

[0053] In the description of the present application, it should be understood that the orientation or position relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0054] In the description of the utility model, it is understood that the terms "first"-"second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first"-"second" can explicitly or implicitly include one or more of the features. In the description of the utility model, the meaning of "multiple" is two or more than two, unless otherwise specifically limited. In addition, the terms "mounting"-"connecting"-"connecting" should be broadly understood, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the communication between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0055] In this embodiment, as shown in Figure 1 and Figure 2 A well submersible motor overturning clamping device, comprising: a fixed seat 1, two limit holes are symmetrically arranged on the transverse axis of the fixed seat 1; a rotating shaft 2, the rotating shaft 2 is connected with the two limit holes of the fixed seat 1 through a bearing, and the output end of the rotating shaft 2 is provided with a connecting piece 21; a clamping frame 3, the clamping frame 3 is connected with the rotating shaft 2 through the connecting piece 21, the rotating shaft 2 is used for driving the clamping frame 3 to rotate, so as to adjust the clamping frame 3 to be in a horizontal state or a vertical state, the clamping frame 3 is processed with a through slot matched with the well submersible motor, and the side, away from the rotating shaft 2, of the clamping frame 3 is processed with an opening; the clamping frame 3 comprises groove plates 32, and the two groove plates 32 are symmetrically distributed based on the opening of the clamping frame 3.

[0056] The opening of the clamping frame 3 is provided with a compensation piece 31, and the compensation piece 31 is used for reducing the through slot of the clamping frame 3, so as to fix the well submersible motor of different sizes in the through slot of the clamping frame 3.

[0057] Therefore, the submersible motor is inserted into the through slot of the clamping frame 3, the submersible motor is fixed in the clamping frame 3 by using the compensation piece 31, in the assembly process, the rotating shaft 2 is driven to rotate under the driving of the external power source, the rotating shaft 2 drives the clamping frame 3 and the submersible motor in the clamping frame 3 to deviate through the connecting piece 21, the submersible motor is adjusted to be in a horizontal or vertical state, so as to facilitate the assembly of the submersible motor, and the submersible motor is clamped, so as to prevent the submersible motor from falling and injuring the operator.

[0058] Specifically, the fixed seat 1 is provided with a cavity, the fixed seat 1 is used for supporting the rotating shaft 2, the rotating shaft 2 is connected with an external power source, for example: a motor, the rotating shaft 2 can also be manually driven, the clamping frame 3 is used for fixing the submersible motor, and the groove plate 32 is integrally formed with the clamping frame 3.

[0059] In some embodiments, as shown in Figure 4 The compensation member 31 includes: a plug-in plate 311 located between the two groove plates 32, the plug-in plate 311 is connected with the two groove plates 32 through a locking member 313, and an end of the plug-in plate 311 away from the locking member 313 extends into the through groove of the clamping frame 3; a compensation plate 312 fixedly connected with the end of the plug-in plate 311 extending into the through groove of the clamping frame 3, and the compensation plate 312 is located in the through groove of the clamping frame 3.

[0060] Specifically, a limiting groove is processed in each of the two groove plates 32, and the transverse movement of the plug-in plate 311 between the two groove plates 32 can change the position of the compensation plate 312 in the clamping frame 3, and the compensation plate 312 is processed in an arc shape to facilitate adaptation to different sizes of submersible motors.

[0061] In some embodiments, as shown in Figure 2 The connecting member 21 includes: a limiting convex plate 211 fixedly connected with the output end of the rotating shaft 2; a mounting concave plate 212 fixedly connected with the clamping frame 3, the recess of the mounting concave plate 212 is matched with the convex part of the limiting convex plate 211, and the mounting concave plate 212 is connected with the limiting convex plate 211 through a connecting screw 213; and the connecting screws 213 are evenly distributed along the mounting concave plate 212.

[0062] Specifically, the limiting convex plate 211 rotates with the rotating shaft 2, the outer periphery of the limiting convex plate 211 is embedded into the recess of the index disc 114, and the connecting screw 213 is designed to have four, and the design of the four connecting screws 213 increases the connection strength of the mounting concave plate 212 and the limiting convex plate 211.

[0063] In addition, other detachable connection structures can also be used between the rotating shaft 2 and the clamping frame 3.

[0064] In some embodiments, as shown in Figure 2 and Figure 3 The top end of the fixed seat 1 is provided with an angle adjusting member 11 for adjusting the rotation angle of the rotating shaft 2.

[0065] The angle adjusting member 11 includes: a cover plate 111 fixedly connected with the top end of the fixed seat 1, and the cover plate 111 is provided with a limiting sliding groove; a sliding seat 112 slidingly connected with the limiting sliding groove of the cover plate 111, and the sliding seat 112 is provided with a cylindrical pin 112a; and an index disc 114, the center hole of the index disc 114 is fixedly connected with the rotating shaft 2, and the index disc 114 is uniformly provided with a circular hole matched with the cylindrical pin 112a.

[0066] The cover plate 111 is used to close the top end of the fixed seat 1, the sliding seat 112 is matched with the limiting sliding groove of the cover plate 111, the round hole on the index plate 114 is matched with the cylindrical pin 112a, the cylindrical pin 112a is inserted into the corresponding round hole to limit the rotation of the rotating shaft 2, and the groove of the index plate 114 is matched with the outer periphery of the limiting convex plate 211.

[0067] In some embodiments, as shown in Figure 5 The limiting sliding groove of the cover plate 111 is provided with a guide piece 113, and the guide piece 113 is used to constrain the moving direction of the sliding seat 112 in the limiting sliding groove of the cover plate 111.

[0068] The guide piece 113 includes a guide rod 113a and an elastic piece 113b; the guide rod 113a is fixedly connected in the limiting sliding groove of the cover plate 111, the guide rod 113a is slidably connected with the sliding seat 112, and the elastic piece 113b is sleeved on the outer periphery of the guide rod 113a and located between the sliding seat 112 and the inner edge of the limiting sliding groove of the cover plate 111.

[0069] Specifically, the design of the guide rod 113a makes the sliding seat 112 only move transversely in the limiting sliding groove of the cover plate 111, and the elastic piece 113b is used to drive the guide rod 113a to reset.

[0070] In some embodiments, as shown in Figure 5 The elastic piece 113b is a compression spring.

[0071] The elastic piece 113b adopts the design of a compression spring, so as to reset the sliding seat 112 and the cylindrical pin 112a.

[0072] In some embodiments, as shown in Figure 5 The guide rods 113a are symmetrically distributed based on the sliding seat 112.

[0073] Specifically, the guide rod 113a is designed to have two guide rods, so as to increase the stability when the sliding seat 112 moves.

[0074] In some embodiments, as shown in Figure 3 The bottom end of the fixed seat 1 is provided with a horizontal moving piece 12; the horizontal moving piece 12 includes a base 121 and a sliding plate 122; the base 121 is located at the bottom end of the fixed seat 1, the sliding plate 122 is slidably connected with the base 121, and the side, away from the base 121, of the sliding plate 122 is fixedly connected with the fixed seat 1; the base 121 is provided with a positioning pin 121a, and the base 121 is connected with the fixed seat 1 through the positioning pin 121a.

[0075] The slide plate 122 is designed with two and is symmetrically distributed based on the fixing base 1, two sliding grooves matched with the slide plate 122 are formed in the base 121, the outer wall of the positioning pin 121a is threaded, and the base 121 is designed to increase the height between the fixing base 1 and the external workbench and facilitate the adjustment of the use position.

[0076] In some embodiments, as shown in Figure 4 The locking member 313 includes a screw rod 313a and a nut 313b; the screw rod 313a is located in the sliding groove of the groove plate 32, one end of the screw rod 313a is fixedly connected with the plug-in plate 311, and the other end of the screw rod 313a is threadedly connected with the nut 313b.

[0077] Both the screw rod 313a and the nut 313b are designed with two, and the screw rod 313a and the nut 313b are used to fix the use position of the plug-in plate 311 in the groove plate 32.

[0078] In some embodiments, as shown in Figure 4 The inner wall of the compensation plate 312 is uniformly distributed with rubber blocks.

[0079] The rubber blocks are designed on the inner wall of the compensation plate 312, and the rubber blocks are used to increase the friction between the compensation plate 312 and the submersible motor.

[0080] The working principle of the application will be described below with a preferred embodiment:

[0081] The mounting concave plate 212 outside the clamping frame 3 is connected with the limiting convex plate 211, and the mounting concave plate 212 and the limiting convex plate 211 are fixed by using the connecting screw rod 213;

[0082] Then the submersible motor is inserted into the through slot of the clamping frame 3, the plug-in plate 311 is moved between the two groove plates 32, the plug-in plate 311 drives the compensation plate 312 to abut against the submersible motor, then the nut 313b on the screw rod 313a is rotated, the nut 313b is abutted against the groove plate 32, and then the submersible motor is fixed in the clamping frame 3, in the assembly process, the sliding seat 112 is moved on the outer wall of the guide rod 113a, the sliding seat 112 drives the cylindrical pin 112a to separate from the protractor 114, at the same time, the sliding seat 112 compresses the elastic member 113b on the outer wall of the guide rod 113a, under the driving of the external power source, the rotating shaft 2 is rotated, the rotating shaft 2 drives the clamping frame 3 and the submersible motor inside the clamping frame 3 to deviate, when the submersible motor is adjusted to a horizontal or vertical state, the sliding seat 112 drives the cylindrical pin 112a to be inserted into the corresponding circular hole of the protractor 114, so as to fix the inclination angle of the submersible motor;

[0083] The fixed seat 1 is moved in the groove of the base 121, the fixed seat 1 drives the sliding plate 122 to move along the base 121, the fixed seat 1 drives the position of the submersible motor to change, and then the position of the fixed seat 1 in the base 121 is re-fixed by using the positioning pin 121a.

[0084] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not limited to them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A tilting and clamping device for a submersible motor used in wells, characterized in that, include: A fixed base (1) has two limiting holes symmetrically opened on its transverse axis; A rotating shaft (2) is connected to two limiting holes of the fixed seat (1) through a bearing, and a connector (21) is provided at the output end of the rotating shaft (2); The clamping frame (3) is connected to the rotating shaft (2) via the connector (21). The rotating shaft (2) is used to drive the clamping frame (3) to rotate, so as to adjust the clamping frame (3) to be in a horizontal or vertical state. The clamping frame (3) is machined with a through groove adapted to the well submersible motor. The clamping frame (3) has an opening on the side away from the rotating shaft (2). The clamping frame (3) includes slotted plates (32), and two slotted plates (32) are symmetrically distributed based on the opening of the clamping frame (3); The opening of the clamping frame (3) is provided with a compensation member (31), which is used to reduce the through slot of the clamping frame (3) so as to fix well submersible motors of different sizes in the through slot of the clamping frame (3).

2. The well submersible motor tilting and clamping device according to claim 1, characterized in that, The compensation component (31) includes: A plug-in plate (311) is located between two slot plates (32). The plug-in plate (311) is connected to the two slot plates (32) by a locking member (313). One end of the plug-in plate (311) away from the locking member (313) extends into the through slot of the clamping frame (3). The compensation plate (312) is fixedly connected to one end of the plug plate (311) extending into the through groove of the clamping frame (3), and the compensation plate (312) is located in the through groove of the clamping frame (3).

3. The well submersible motor tilting and clamping device according to claim 1, characterized in that, The connector (21) includes: A limiting protrusion (211) is fixedly connected to the output end of the rotating shaft (2); Mounting concave plate (212) is fixedly connected to the clamping frame (3). The groove of the mounting concave plate (212) is adapted to the protrusion of the limiting protrusion plate (211). The mounting concave plate (212) is connected to the limiting protrusion plate (211) through a connecting screw (213). The connecting screws (213) are evenly distributed along the mounting recess (212).

4. The well submersible motor tilting and clamping device according to claim 1, characterized in that, An angle adjustment component (11) is installed at the top of the fixed base (1), and the angle adjustment component (11) is used to adjust the rotation angle of the rotating shaft (2); The angle adjustment component (11) includes: Cover plate (111), the cover plate (111) is fixedly connected to the top of the fixed seat (1), and the cover plate (111) has a limit groove; A slide (112) is slidably connected to the limiting groove of the cover plate (111), and the slide (112) is provided with a cylindrical pin (112a); Indexing plate (114), the central hole of the indexing plate (114) is fixedly connected to the rotating shaft (2), and the indexing plate (114) has evenly distributed round holes that are adapted to the cylindrical pin (112a).

5. The well submersible motor tilting and clamping device according to claim 4, characterized in that, A guide (113) is installed in the limiting groove of the cover plate (111), and the guide (113) is used to constrain the movement direction of the slide block (112) in the limiting groove of the cover plate (111). The guide member (113) includes a guide rod (113a) and an elastic member (113b); The guide rod (113a) is fixedly connected in the limiting groove of the cover plate (111), the guide rod (113a) is slidably connected to the slide block (112), and the elastic element (113b) is sleeved on the outer periphery of the guide rod (113a). The elastic element (113b) is located between the slide block (112) and the inner edge of the limiting groove of the cover plate (111).

6. The well submersible motor tilting and clamping device according to claim 5, characterized in that, The elastic element (113b) is a compression spring.

7. The well submersible motor tilting and clamping device according to claim 5, characterized in that, The guide rod (113a) is symmetrically distributed based on the slide (112).

8. The well submersible motor tilting and clamping device according to claim 1, characterized in that, A transverse sliding member (12) is installed at the bottom end of the fixed base (1); The transverse component (12) includes a base (121) and a sliding plate (122); The base (121) is located at the bottom end of the fixed seat (1), the slide plate (122) is slidably connected to the base (121), and the side of the slide plate (122) away from the base (121) is fixedly connected to the fixed seat (1); The base (121) is equipped with a positioning pin (121a), and the base (121) is connected to the fixed seat (1) through the positioning pin (121a).

9. A well submersible motor tilting and clamping device according to claim 2, characterized in that, The locking element (313) includes a screw (313a) and a nut (313b); The screw (313a) is located in the groove of the slot plate (32), one end of the screw (313a) is fixedly connected to the plug plate (311), and the other end of the screw (313a) is threadedly connected to the nut (313b).

10. A well submersible motor flipping and clamping device according to claim 2, characterized in that, The inner wall of the compensation plate (312) is uniformly distributed with rubber blocks.