Motor stator assembling clamp

Abstract

The utility model relates to the technical field of assembly equipment, and discloses a motor stator assembly fixture, which comprises a positioning unit for clamping and positioning a base and a clamping unit for clamping a stator winding or the base. The positioning unit comprises two arc-shaped clamping plates which can move towards each other or away from each other; the clamping unit comprises a bearing disc, and a plurality of movable sliding strips are connected into the bearing disc in a sliding mode. According to the utility model, the horizontal transverse position and the horizontal longitudinal position of the bearing disc are adjusted through the first adjusting unit and the second adjusting unit, the driving unit can drive the movable sliding strips to move face to face or back to back, and the plurality of arc-shaped abutting plates can abut against the inner side wall of a machine base or a stator winding. The stator winding and the machine base can be assembled at the conveying starting point position of the conveying device in cooperation with the first telescopic device and the first driving motor, the machine base assembled with the stator winding is conveyed to the next station through the conveying device, and the efficiency of assembling the motor stator is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of assembly equipment, in particular to a motor stator assembly fixture. Background Art

[0002] The structure of the motor is roughly divided into two parts. One part is the relatively fixed stator part, and the other part is the rotor assembly installed in the stator. When the motor is produced, the stator needs to be inserted into the motor base for assembly, and an assembly fixture is required for its assembly.

[0003] In order to facilitate the assembly of motor stators, the prior art has made many improvements to motor stator assembly fixtures. For example, patent publication number CN220775589U discloses a motor stator assembly fixture, comprising a base, the top of which is provided with two mounting grooves, the inner walls of the two mounting grooves being connected to the base via a limit assembly, a slide groove being provided in the middle of the top of the base, and an adjustment assembly being provided on the inner wall of the slide groove. This utility model places two support blocks at the bottom of the base inside the two mounting grooves, cooperates with two through holes to move two adjustment screws, and the two adjustment screws drive the two limit blocks to move within the two mounting grooves. The two sets of connecting blocks at both ends of the two limit blocks move on the inner walls of the two sets of moving grooves, thereby limiting their movement. The two limit blocks cooperate with two rubber strips to engage and limit the surfaces of the two support blocks, thereby facilitating the limited fixation of bases of different sizes.

[0004] The above patents have obvious beneficial effects, but still have the following deficiencies in actual operation:

[0005] In the above-mentioned comparative documents, the machine base is limited by a limiting component, the stator winding is clamped by an auxiliary component, and the stator winding is horizontally inserted into the machine base for assembly with the help of a horizontally movable mounting block. However, in reality, if the assembly method in the above-mentioned comparative documents is adopted, the stator winding needs to be manually sleeved on the side of the auxiliary component. Some larger motors have heavier stator windings, so other lifting equipment is needed to sleeve the stator winding horizontally on the side of the auxiliary component. After assembly, it needs to be removed and transferred to the next workstation, thereby reducing the efficiency of motor stator assembly. Therefore, there is an urgent need in this field to improve the motor stator assembly fixture to solve the defects of the existing technology. Utility Model Content

[0006] In view of the deficiencies in the prior art, the present invention provides a motor stator assembly fixture, which improves the efficiency of assembling the motor stator.

[0007] To achieve the above-mentioned object, the present invention provides the following technical solutions: a motor stator assembly fixture, comprising a positioning unit for clamping and positioning a base and a clamping unit for clamping the stator winding or the base;

[0008] The positioning unit includes two arc-shaped clamping plates that can move toward or away from each other;

[0009] The clamping unit includes a carrier plate, in which a plurality of movable slides are slidably connected, and each of the movable slides is fixedly connected to an arc-shaped abutting plate at opposite ends. The carrier plate is provided with a driving unit for driving the plurality of movable slides to move toward or away from each other simultaneously;

[0010] It also includes a base, the upper surface of the base is provided with an inverted U-shaped fixing frame, the upper surface of the fixing frame is provided with a conveying device for conveying and two symmetrical placement areas, the positioning unit is provided at a starting position on the conveying device, the inner top wall of the fixing frame is provided with a cross-shaped moving seat of the fixing frame, the lower side of the moving seat is provided with a first driving motor, the lower end of the output of the first driving motor is fixedly installed with a first telescopic device, and the carrying plate is provided at the telescopic lower end of the first telescopic device;

[0011] A first adjusting unit for moving the movable seat along the fixed frame is provided on one side of the fixed frame, and a second adjusting unit for moving the first driving motor along the length direction of the movable seat is provided on one end of the movable seat.

[0012] Preferably, the driving unit includes a rotating ring that is rotatably connected in the supporting plate and whose side is tightly attached to the moving slide. Several gears that are rotatably connected in the supporting plate and mesh with the side of the rotating ring are also rotatably connected. The gears are also meshed with the moving slide. A second driving motor is fixedly installed on the upper part of the supporting plate, and the output end is fixedly connected to one of the gears.

[0013] Preferably, two symmetrical fixed plates are fixedly mounted on the upper portion of the conveying device, a second telescopic device is fixedly mounted on both of the fixed plates, and the arc-shaped clamping plate is arranged at the telescopic end of the second telescopic device.

[0014] Preferably, the first adjusting unit includes a third driving motor fixedly mounted on one side of the fixed frame, a first sliding block is fixedly mounted on the upper side of the movable seat, a first sliding groove adapted to the first sliding block is provided on the inner top wall of the fixed frame, a first screw rod having one end fixedly connected to the output end of the third driving motor is rotatably connected in the first sliding groove, the first screw rod passes through the first sliding block and is threadedly connected to the first sliding block.

[0015] Preferably, the second adjustment unit includes a fourth drive motor fixedly mounted at one end of the moving seat, a second sliding block is fixedly mounted on the upper part of the first drive motor, a second sliding groove adapted to the second sliding block is provided on the lower side of the moving seat, a second screw rod having one end fixedly connected to the output end of the fourth drive motor is rotatably connected in the second sliding groove, the second screw rod passes through the second sliding block and is threadedly connected to the second sliding block.

[0016] Preferably, a first plug-in block is fixedly connected to one side of the arc-shaped clamping plate, a first plug-in groove adapted to the first plug-in block is opened on the side of the telescopic end of the second telescopic device, and an elastic extrusion plate is fixedly connected between the two ends of the arc-shaped clamping plate.

[0017] Preferably, a second plug-in block is fixedly connected to the upper part of the supporting plate, a second plug-in slot adapted to the second plug-in block is opened on the side of the telescopic lower end of the first telescopic device, a limiting bolt with one end threadedly connected to the second plug-in block passes through the side of the telescopic end of the first telescopic device, and a cover plate is fixedly installed on the lower surface of the supporting plate by fasteners.

[0018] In view of the shortcomings of the existing technology, the present invention provides a motor stator assembly fixture, which overcomes the shortcomings of the existing technology. The beneficial effects of the present invention are:

[0019] 1. In the present invention, the horizontal transverse and horizontal longitudinal positions of the carrier plate are adjusted by the first adjustment unit and the second adjustment unit. The driving unit can drive the movable slide bar to move toward or away from each other. A plurality of arc-shaped clamping plates can be pressed against the inner wall of the machine base or the stator winding. In conjunction with the first telescopic device and the first drive motor, the stator winding and the machine base can be assembled at the starting position of the conveying device. The machine base with the assembled stator winding is conveyed to the next workstation by the conveying device, thereby improving the efficiency of assembling the motor stator.

[0020] 2. In the present invention, a gear is driven to rotate by the output end of the second driving motor, the gear drives the rotating ring to rotate, the rotating ring drives several gears to rotate simultaneously, and the several gears simultaneously drive the movable slides to move toward or away from each other, which can clamp and move machine bases or stator windings of different sizes, thereby improving the applicability of the overall device.

[0021] 3. In the present invention, by setting the first plug-in block and the second plug-in block, when the arc-shaped clamping plate and the carrier plate are adapted to the machine base or the stator winding, the arc-shaped clamping plate and the carrier plate can be replaced by the first plug-in block and the second plug-in block, thereby further improving the applicability of the overall device.

[0022] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be achieved and obtained by the structures indicated in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation to the present invention.

[0024] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0025] Figure 2 It is a structural diagram of the utility model from another perspective;

[0026] Figure 3 This is a schematic structural diagram of the carrier plate in the present invention;

[0027] Figure 4 This is a schematic diagram of the structure inside the carrier plate of the present invention;

[0028] Figure 5 This is a schematic structural diagram of an arc-shaped clamping plate in the present invention;

[0029] Figure 6 This is a schematic diagram of the structure of the rotating ring, movable slide bar and gear in the present invention;

[0030] Figure 7 for Figure 1 A in the middle is an enlarged structural diagram;

[0031] Figure 8 for Figure 2 The enlarged structural diagram at B in the middle;

[0032] Figure 9 for Figure 3 Enlarged structural diagram at point C in the middle.

[0033] In the figure: 1. positioning unit; 2. clamping unit; 3. arc-shaped clamping plate; 4. carrying plate; 5. moving slide; 6. arc-shaped pressing plate; 7. driving unit; 8. base; 9. fixing frame; 10. conveying device; 11. moving seat; 12. placement area; 13. first adjusting unit; 14. second adjusting unit; 15. first driving motor; 16. first telescopic device; 17. rotating ring; 18. gear; 19. second driving motor; 20. fixing plate; 21. second telescopic device; 22. third driving motor; 23. first sliding block; 24. first sliding groove; 25. first screw rod; 26. second sliding block; 27. second sliding groove; 28. second screw rod; 29. first plug-in block; 30. first plug-in groove; 31. second plug-in block; 32. second plug-in groove; 33. limit bolt; 34. extrusion plate; 35. fourth driving motor; 36. cover plate. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0035] Example 1

[0036] See also Figures 1-9 , a motor stator assembly fixture, including a positioning unit 1 for clamping and positioning the machine base and a clamping unit 2 for clamping the stator winding or the machine base; the positioning unit 1 includes two arc-shaped clamping plates 3 that can move toward or away from each other; the clamping unit 2 includes a carrying plate 4, in which a plurality of movable slides 5 are slidably connected, and each movable slide 5 is fixedly connected to an arc-shaped holding plate 6 at its opposite end, and a driving unit 7 for driving the plurality of movable slides 5 to move toward or away from each other at the same time is provided on the carrying plate 4; it also includes a base 8, the upper surface of the base 8 is provided with an inverted U-shaped fixing frame 9, and the upper surface of the fixing frame 9 is provided with a fixing frame for conveying The conveying device 10 and two symmetrical placement areas 12 are provided, the positioning unit 1 is provided at the starting position on the conveying device 10, the inner top wall of the fixed frame 9 is provided with a cross-shaped moving seat 11 of the fixed frame 9, and the lower side of the moving seat 11 is provided with a first drive motor 15, and the first telescopic device 16 is fixedly installed at the lower end of the output of the first drive motor 15, and the carrying plate 4 is provided at the telescopic lower end of the first telescopic device 16; a first adjusting unit 13 for moving the moving seat 11 along the fixed frame 9 is provided on one side of the fixed frame 9, and a second adjusting unit 14 for moving the first drive motor 15 along the length direction of the moving seat 11 is provided at one end of the moving seat 11.

[0037] The specific implementation method of this embodiment is as follows: the machine base and stator winding to be assembled are placed on transfer pieces such as trays, and the trays are placed in the placement area 12. When the stator winding and the machine base need to be assembled, the movable base 11 is moved along the length direction of the fixed frame 9 by the first adjustment unit 13, and the first drive motor 15 is adjusted along the length direction of the movable base 11 by the second adjustment unit 14 to adjust the horizontal transverse and horizontal longitudinal positions of the carrier plate 4, and the position of the carrier plate 4 is moved to the placement area 12 and adapted to the position of the machine base. Start the first telescopic device 16, which is a multi-section electric telescopic rod in the prior art. The telescopic end of the first telescopic device 16 drives the carrier plate 4 to move downward, and the carrier plate 4 is inserted into the internal cavity of the machine base. At this time, by starting the driving unit 7, the driving unit 7 drives several moving slides 5 to move in opposite directions. The moving slides 5 drive the elastic arc-shaped pressing plate 6 to press against the inner wall of the machine base. The telescopic end of the first telescopic device 16 contracts, and at the same time, through the cooperation of the first adjustment unit 13 and the second adjustment unit 14, the position of the carrier plate 4 is moved to the conveying device 10. The starting position of the machine base is set, and the machine base is located between the two arc-shaped clamping plates 3. The two arc-shaped clamping plates 3 are controlled to move toward each other to clamp and position the machine base. The driving unit 7 drives several moving slides 5 to move toward each other to break away from the clamping of the machine base, and again through the cooperation of the first adjusting unit 13, the second adjusting unit 14 and the first telescopic device 16, the stator winding is also moved to the top of the machine base that has been positioned. By starting the first driving motor 15 to rotate the carrier plate 4, the installation position between the stator winding and the machine base is adjusted. After the position adjustment is completed, the first telescopic device The telescopic end of the device 16 drives the stator winding to move down and insert it into the base, completing the assembly of the stator winding and the base. After the assembly is completed, the two arc-shaped clamping plates 3 are controlled to move back to each other, and the conveying device 10 is started at the same time to convey the motor with the assembled stator winding to the next workstation. The assembler uses a forklift to place the pallet with the base or stator winding in the placement area 12, and then can cooperate with the mobile carrier plate 4 to assemble the base and stator winding, and cooperate with the conveying device 10 to directly convey the assembled stator to the next workstation, thereby improving the efficiency of motor stator assembly.

[0038] Example 2

[0039] See also Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 and Figure 7, this embodiment includes the above-mentioned embodiment, wherein the driving unit 7 includes a rotating ring 17 rotatably connected in the carrying plate 4 and with the side surface tightly attached to the moving slide 5, a plurality of gears 18 rotatably connected in the carrying plate 4 and meshing with the side surface of the rotating ring 17, the gears 18 are simultaneously meshed with the moving slide 5, a second driving motor 19 is fixedly mounted on the upper part of the carrying plate 4 with the output end fixedly connected to one of the gears 18, two symmetrical fixed plates 20 are fixedly mounted on the upper part of the conveying device 10, a second telescopic device 21 is fixedly mounted on both fixed plates 20, and the arc-shaped clamping plate 3 is arranged at the telescopic end of the second telescopic device 21.

[0040] The specific implementation method in this embodiment is as follows: when the second drive motor 19 is started, the output end of the second drive motor 19 drives one of the gears 18 to rotate, and the gear 18 drives the rotating ring 17 to rotate. When the rotating ring 17 rotates, it drives several gears 18 to rotate at the same time. At the same time, when the gear 18 rotates, it drives the movable slide 5 to slide in the slide groove in the carrier plate 4, thereby realizing that several movable slides 5 simultaneously drive the arc-shaped clamping plates 6 to move toward or away from each other, and can clamp and move machine bases or stator windings of different sizes, thereby improving the applicability of the overall device, and moving the machine base between the two arc-shaped clamping plates 3. By starting the two second telescopic devices 21, the telescopic ends of the two second telescopic devices 21 drive the two arc-shaped clamping plates 3 to move toward each other, thereby limiting the machine base.

[0041] Implementation Three

[0042] See also Figure 1 、 Figure 2 、 Figure 3 and Figure 8 , this embodiment includes all the above embodiments, wherein the first adjusting unit 13 includes a third driving motor 22 fixedly mounted on one side of the fixed frame 9, a first sliding block 23 is fixedly mounted on the upper side of the moving seat 11, and a first sliding groove 24 adapted to the first sliding block 23 is provided on the inner top wall of the fixed frame 9, and a first screw rod 25 with one end fixedly connected to the output end of the third driving motor 22 is rotatably connected in the first sliding groove 24, the first screw rod 25 passes through the first sliding block 23 and is threadedly connected to the first sliding block 23, the second adjusting unit 14 includes a fourth driving motor 35 fixedly mounted on one end of the moving seat 11, a second sliding block 26 is fixedly mounted on the upper part of the first driving motor 15, and a second sliding groove 27 adapted to the second sliding block 26 is provided on the lower side of the moving seat 11, a second screw rod 28 with one end fixedly connected to the output end of the fourth driving motor 35 is rotatably connected in the second sliding groove 27, the second screw rod 28 passes through the second sliding block 26 and is threadedly connected to the second sliding block 26.

[0043] Specific implementation method in this embodiment: when the third drive motor 22 is started, the output end of the third drive motor 22 drives the first screw rod 25 to rotate, and when the first screw rod 25 rotates, it drives the first sliding block 23 to slide in the first sliding groove 24, and when the first sliding block 23 moves, it drives the moving seat 11 to move along the first sliding groove 24; when the fourth drive motor 35 is started, the output end of the fourth drive motor 35 drives the second screw rod 28 to rotate, and when the second screw rod 28 rotates, it drives the second sliding block 26 to slide in the second sliding groove 27, and the second sliding block 26 drives the first drive motor 15 to move along the second sliding groove 27, thereby realizing the horizontal transverse or horizontal longitudinal movement of the carrying plate 4; the length of the moving seat 11 is adapted to the placement area 12; as long as the machine base or stator winding is located in the two placement areas 12, the carrying plate 4 can be moved to this position, thereby improving the applicability of the overall device.

[0044] Implementation Four

[0045] See also Figure 3 、 Figure 5 and Figure 9 , this embodiment includes all the above embodiments, which further include: a first plug-in block 29 is fixedly connected to one side of the arc-shaped clamping plate 3, a first plug-in groove 30 adapted to the first plug-in block 29 is opened on the side of the telescopic end of the second telescopic device 21, an elastic extrusion plate 34 is fixedly connected between the two ends of the arc-shaped clamping plate 3, a second plug-in block 31 is fixedly connected to the upper part of the carrying plate 4, a second plug-in groove 32 adapted to the second plug-in block 31 is opened on the side of the telescopic lower end of the first telescopic device 16, a limiting bolt 33 with one end threadedly connected to the second plug-in block 31 is penetrated through the side of the telescopic end of the first telescopic device 16, and a cover plate 36 is fixedly installed on the lower surface of the carrying plate 4 by fasteners.

[0046] Specific implementation method in this embodiment: The elastic extrusion plate 34 can increase the contact area with the machine base, improve the clamping range and clamping stability of the machine base, if the extrusion plate 34 or the arc-shaped clamping plate 3 is not compatible with the machine base, the first plug-in block 29 can be used to remove the first plug-in slot 30 and replace the arc-shaped clamping plate 3. The lower end of the first plug-in slot 30 does not pass through the side of the telescopic end of the second telescopic device 21. The adapted arc-shaped clamping plate 3 is plugged into the first plug-in slot 30 through the first plug-in block 29, which is convenient for replacing the arc-shaped clamping plate 3, and the carrier plate 4 is in contact with the stator winding or the cavity in the machine base. When it is not suitable, the second plug-in slot 32 can also be taken out through the second plug-in block 31 to replace the carrier plate 4, and the second plug-in block 31 adapted to the upper part of the carrier plate 4 can be inserted into the second plug-in slot 32, and one end of the limiting bolt 33 can be passed through the side of the telescopic end of the first telescopic device 16, and one end of the limiting bolt 33 can be threadedly connected to the threaded hole on one side of the second plug-in block 31, so as to facilitate the installation or disassembly and replacement of the carrier plate 4, thereby improving the applicability of the overall device. At the same time, the cover plate 36 is installed on the lower surface of the carrier plate 4 through fasteners, which is convenient for the installation or later maintenance of the components in the carrier plate 4.

[0047] Among them, the above-mentioned electrical products can all be purchased on the market. They are mature technologies and have been fully disclosed, so they are not repeated in the specification. The above-mentioned electrical products are all equipped with power connection lines, and they are electrically connected to the external main controller and 220V phase voltage (or 380V line voltage) through the power lines, and the main controller can be a conventional known device such as a computer that plays a control role.

[0048] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A motor stator assembly fixture, characterized in that: It comprises a positioning unit (1) for clamping and positioning a machine base and a clamping unit (2) for clamping a stator winding or a machine base; The positioning unit (1) comprises two arc-shaped clamping plates (3) capable of moving toward or away from each other; The clamping unit (2) includes a carrier plate (4), a plurality of movable slide bars (5) are slidably connected in the carrier plate (4), and each of the movable slide bars (5) is fixedly connected to an arc-shaped abutting plate (6) at opposite ends. The carrier plate (4) is provided with a driving unit (7) for driving the plurality of movable slide bars (5) to move toward or away from each other simultaneously. It also includes a base (8), the upper surface of the base (8) is provided with an inverted U-shaped fixed frame (9), the upper surface of the fixed frame (9) is provided with a conveying device (10) for conveying and two symmetrical placement areas (12), the positioning unit (1) is arranged at a starting position on the conveying device (10), the inner top wall of the fixed frame (9) is provided with a cross-shaped moving seat (11) of the fixed frame (9), the lower side of the moving seat (11) is provided with a first driving motor (15), the output lower end of the first driving motor (15) is fixedly installed with a first telescopic device (16), and the carrying plate (4) is arranged at the telescopic lower end of the first telescopic device (16); A first adjusting unit (13) for moving the movable seat (11) along the fixed frame (9) is provided on one side of the fixed frame (9), and a second adjusting unit (14) for moving the first driving motor (15) along the length direction of the movable seat (11) is provided on one end of the movable seat (11).

2. The motor stator assembly fixture according to claim 1, characterized in that: The driving unit (7) includes a rotating ring (17) rotatably connected in the carrier plate (4) and having its side surface tightly attached to the movable slide bar (5); a plurality of gears (18) rotatably connected in the carrier plate (4) and meshing with the side surfaces of the rotating ring (17); the gears (18) simultaneously meshing with the movable slide bar (5); and a second driving motor (19) having an output end fixedly connected to one of the gears (18) is fixedly mounted on the upper portion of the carrier plate (4).

3. The motor stator assembly fixture according to claim 1, characterized in that: Two symmetrical fixed plates (20) are fixedly mounted on the upper portion of the conveying device (10), a second telescopic device (21) is fixedly mounted on both of the fixed plates (20), and the arc-shaped clamping plate (3) is arranged at the telescopic end of the second telescopic device (21).

4. The motor stator assembly fixture according to claim 1, characterized in that: The first adjusting unit (13) includes a third driving motor (22) fixedly mounted on one side of the fixing frame (9); a first sliding block (23) is fixedly mounted on the upper side of the movable seat (11); a first sliding groove (24) adapted to the first sliding block (23) is provided on the inner top wall of the fixing frame (9); a first screw rod (25) having one end fixedly connected to the output end of the third driving motor (22) is rotatably connected in the first sliding groove (24); the first screw rod (25) passes through the first sliding block (23) and is threadedly connected to the first sliding block (23).

5. The motor stator assembly fixture according to claim 1, characterized in that: The second adjustment unit (14) includes a fourth drive motor (35) fixedly mounted on one end of the moving seat (11); a second sliding block (26) is fixedly mounted on the upper portion of the first drive motor (15); a second sliding groove (27) adapted to the second sliding block (26) is provided on the lower side of the moving seat (11); a second screw rod (28) having one end fixedly connected to the output end of the fourth drive motor (35) is rotatably connected in the second sliding groove (27); the second screw rod (28) passes through the second sliding block (26) and is threadedly connected to the second sliding block (26).

6. The motor stator assembly fixture according to claim 3, characterized in that: A first plug-in block (29) is fixedly connected to one side of the arc-shaped clamping plate (3); a first plug-in slot (30) adapted to the first plug-in block (29) is provided on the side of the telescopic end of the second telescopic device (21); and an elastic extrusion plate (34) is fixedly connected between the two ends of the arc-shaped clamping plate (3).

7. The motor stator assembly fixture according to claim 1, characterized in that: The upper part of the carrier plate (4) is fixedly connected to a second plug-in block (31); the side surface of the telescopic lower end of the first telescopic device (16) is provided with a second plug-in slot (32) adapted to the second plug-in block (31); the side surface of the telescopic end of the first telescopic device (16) is penetrated by a limiting bolt (33) whose end is threadedly connected to the second plug-in block (31); and a cover plate (36) is fixedly installed on the lower surface of the carrier plate (4) by fasteners.

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