A protection structure for a new energy automobile motor

Abstract

The application provides a protection structure for a new energy automobile motor, and relates to the technical field of new energy automobile motors, which comprises a connecting and positioning mechanism, a movable protection mechanism installed outside the connecting and positioning mechanism, the connecting and positioning mechanism being used for improving the mounting and dismounting efficiency of the connecting and positioning mechanism, two sets of limiting and pressing mechanisms, the two sets of limiting and pressing mechanisms being installed on the connecting and positioning mechanism, the two sets of limiting and pressing mechanisms being used for preventing the connecting and positioning mechanism from loosening and limiting the movable protection mechanism, an auxiliary protection mechanism installed on the top of the movable protection mechanism, and the hands of the workers not needing to be inserted into the frame of the new energy automobile, so that the hands of the workers are prevented from being clamped. The application solves the problem that the hands of the workers are generally needed to be inserted into the frame of the new energy automobile when the workers install the motor shell, so that the hands of the workers are prone to being clamped.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of new energy automobile motor, more specifically, particularly relates to a protection structure for new energy automobile motor. BACKGROUND

[0002] The new energy automobile motor shell is a key protection structure of the driving motor, which is usually made of lightweight aluminum alloy material, and has high strength and corrosion resistance.

[0003] As disclosed in the publication No. CN220273436U, a water-cooled motor shell for new energy vehicles is disclosed, which comprises a shell body, the shell body comprises an inner shell and an outer shell, the inner shell and the outer shell are connected through a partition plate, the partition plate separates the inner shell and the outer shell into a plurality of cooling cavities, the partition plate is provided with a flow guide opening for communicating adjacent two cooling cavities, the flow guide openings of adjacent two partition plates are arranged on opposite sides of the partition plate; the outer shell is also provided with a plurality of cooling fins comprising a cooling shell and a cooling groove; the water-cooled motor shell for new energy vehicles can quickly realize cooling and heat dissipation, and realize simultaneous cooling and heat dissipation inside and outside the motor, and has good heat dissipation effect.

[0004] Based on the above, the new energy automobile motor shell currently used still has the following problems: 1. When the staff installs the motor shell, the hands usually need to be inserted into the frame of the new energy automobile, which causes the hands of the staff to be easily injured; 2. When the motor works for a long time, the screws fixing the motor shell are prone to looseness, which causes the motor to work stably; 3. Generally, there is a lack of wire protection structure, which causes the motor wire to be easily pulled off when the motor wire is pulled, affecting the subsequent use of the motor. SUMMARY

[0005] The protection structure for new energy automobile motor has a connecting and positioning mechanism, a movable protection mechanism, a limiting and pressing mechanism and an auxiliary protection mechanism; the hands of the staff do not need to be inserted into the frame of the new energy automobile, avoiding the hands of the staff from being injured; two limiting and pressing frames play a pressing role on four connecting screws, avoiding the loosening of the four connecting screws; the setting of four supporting springs c enables the movable mounting block to automatically reset after moving, and can protect the motor wire multiple times; the problems of the hands of the staff being easily injured, the screws fixing the motor shell being prone to looseness and the motor wire being easily pulled off when the motor wire is pulled are solved.

[0006] The application provides a protection structure for a new energy automobile motor, which comprises a connecting positioning mechanism, a movable protection mechanism, a limiting and pressing mechanism and an auxiliary protection mechanism.

[0007] In at least some embodiments, the connecting positioning mechanism comprises a vehicle frame connecting plate and a circular guide rod.

[0008] In at least some embodiments, the connecting positioning mechanism further comprises a supporting spring a and a connecting threaded nail.

[0009] In at least some embodiments, the movable protection mechanism comprises a connecting guide block and a motor shell.

[0010] In at least some embodiments, the movable protection mechanism further comprises a limiting clamping block.

[0011] In at least some embodiments, the limiting and pressing mechanism comprises a circular mounting column, a movable mounting plate and a limiting and pressing frame.

[0012] In at least some embodiments, the limiting and pressing mechanism further comprises: three supporting springs b and a U-shaped separation handle; the three supporting springs b are sleeved outside the three circular mounting columns and located outside the movable mounting plate; and the U-shaped separation handle is fixedly installed on the top of the limiting and pressing frame.

[0013] In at least some embodiments, the auxiliary protection mechanism comprises: two rectangular protection plates, two circular guide shafts and a movable mounting block; the two rectangular protection plates are fixedly installed on the top of the motor housing; the two circular guide shafts are fixedly installed on the two rectangular protection plates; and the movable mounting block is slidingly installed outside the two circular guide shafts.

[0014] In at least some embodiments, the auxiliary protection mechanism further comprises: four supporting springs c and an L-shaped mounting frame; the four supporting springs c are sleeved outside the two circular guide shafts and located on the front and rear sides of the movable mounting block; and the L-shaped mounting frame is fixedly installed on the top of the movable mounting block.

[0015] In at least some embodiments, the auxiliary protection mechanism further comprises: an arc-shaped protection block a, an adjusting threaded column and an arc-shaped protection block b; the arc-shaped protection block a is fixedly installed on the top of the movable mounting block; the adjusting threaded column is threadedly connected to the L-shaped mounting frame; the arc-shaped protection block b is rotatably installed on the adjusting threaded column and located directly above the arc-shaped protection block a; and the inner walls of the arc-shaped protection block a and the arc-shaped protection block b are respectively provided with a row of tapered protrusions.

[0016] Compared with the prior art, the present application has the following advantages:

[0017] 1、The four connecting threaded nails are used for fixedly connecting the frame connecting plate and the frame of the new energy vehicle; the motor housing can slide up and down under the action of the four circular guide rods and the four connecting guide blocks, so as to facilitate the installation or disassembly of the motor housing by the staff.

[0018] In addition, the four supporting springs a are used for supporting the motor housing and the parts on the motor housing, so that the hands of the staff do not need to be inserted into the frame of the new energy vehicle, thereby avoiding the hands of the staff from being pinched.

[0019] 2、The two limiting and pressing frames are used for limiting the motor housing, so that the bottom of the motor housing is in contact with the top of the frame connecting plate; when the two limiting and pressing frames need to be separated from the two rectangular limiting grooves, the staff pulls the two U-shaped separation handles outward.

[0020] In addition, the six support springs b provide elastic support for the two movable mounting plates, ensuring that the two limiting clamping brackets only move when subjected to force. The two limiting clamping brackets also clamp the four connecting threaded pins, preventing them from loosening. When the inner ends of the two limiting clamping brackets separate from the two rectangular limiting grooves, the two limiting clamping brackets can still move inward a certain distance under the action of the six support springs b, separating the bottom of the two limiting clamping brackets from the four connecting threaded pins, without hindering the disassembly and installation of the four connecting threaded pins.

[0021] 3. When the operator rotates the adjusting threaded column, the arc-shaped protective block b moves downward, which presses down on the wires on the motor; the two rows of conical protrusions increase the friction between the wires and the motor.

[0022] In addition, the two circular guide shafts allow the movable mounting block to slide on them; the four support springs ensure that the movable mounting block can automatically reset after movement, providing multiple protections for the motor wiring. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments will be briefly described below.

[0024] The accompanying drawings described below are only related to some embodiments of the invention and are not intended to limit the invention.

[0025] In the attached diagram:

[0026] Figure 1 A three-dimensional structural schematic diagram of the present invention is shown;

[0027] Figure 2 The present invention is shown. Figure 1 A schematic diagram of the structure from the right-side main viewpoint;

[0028] Figure 3 A schematic diagram of the connection and positioning mechanism of the present invention is shown;

[0029] Figure 4 A schematic diagram of the active protective mechanism of the present invention is shown;

[0030] Figure 5 A schematic diagram of the structure of the frame connecting plate and the two sets of limiting and pressing mechanisms of the present invention is shown;

[0031] Figure 6 The present invention is shown. Figure 1 A schematic diagram of the central cross-section structure;

[0032] Figure 7 The present invention is shown. Figure 6 A magnified schematic diagram of a portion of region A in the middle;

[0033] Figure 8 A partial enlarged structural schematic view of the B region in the present application is shown. Figure 1

[0034] Figure 9 A structural schematic view of the auxiliary protection mechanism in the present application is shown.

[0035] Figure 10 A partial enlarged structural schematic view of the C region in the present application is shown. Figure 6

[0036] List of reference signs:

[0037] 100, connecting positioning mechanism; 101, frame connecting plate; 102, round guide rod; 103, support spring a; 104, connecting threaded peg;

[0038] 200, movable protection mechanism; 201, connecting guide block; 202, motor housing; 203, limiting clamping block; 2031, rectangular limiting groove;

[0039] 300, limiting compression mechanism; 301, round mounting column; 302, movable mounting plate; 303, limiting compression frame; 304, support spring b; 305, U-shaped separation handle;

[0040] 400, auxiliary protection mechanism; 401, rectangular protection flat plate; 402, round guide shaft; 403, movable mounting block; 404, support spring c; 405, L-shaped mounting frame; 406, arc-shaped protection block a; 407, adjusting threaded column; 408, arc-shaped protection block b. DETAILED DESCRIPTION

[0041] In order to make the purpose, scheme and advantages of the technical solutions of the present application more clear, the technical solutions of the embodiments of the present application will be described clearly and completely below in combination with the drawings of the specific embodiments of the present application. Unless otherwise specified, the terms used herein have the meanings commonly used in the art. The same reference signs in the drawings represent the same components.

[0042] Embodiment: please refer to Figures 1 to 10 ​​As shown: the present application provides a kind of protection structure for new energy automobile motor, comprising: connecting positioning mechanism 100, movable protection mechanism 200, limiting and pressing mechanism 300 and auxiliary protection mechanism 400;Movable protection mechanism 200 is installed in the outside of connecting positioning mechanism 100, connecting positioning mechanism 100 is used to improve the installation and removal efficiency of movable protection mechanism 200;Two groups of limiting and pressing mechanism 300 are provided, and two groups of limiting and pressing mechanism 300 are installed on connecting positioning mechanism 100, two groups of limiting and pressing mechanism 300 are used to prevent connecting positioning mechanism 100 from loosening, and two groups of limiting and pressing mechanism 300 are also used to limit movable protection mechanism 200;Auxiliary protection mechanism 400 is installed at the top of movable protection mechanism 200, and auxiliary protection mechanism 400 is used to protect the wire on motor.

[0043] As shown in the embodiments of the present application, Figure 3 And Figure 4 Connecting positioning mechanism 100 includes: frame connecting plate 101 and circular guide rod 102;Two rectangular slots are formed in frame connecting plate 101;Four circular guide rods 102 are provided, and the four circular guide rods 102 are fixedly installed at the top corners of frame connecting plate 101, and the top of two circular guide rods 102 is provided with a rounded corner;Connecting positioning mechanism 100 further includes: support spring a 103 and connecting threaded nail 104;Four support springs a 103 are provided, and the four support springs a 103 are sleeved outside the four circular guide rods 102;Four connecting threaded nails 104 are provided, and the four connecting threaded nails 104 are inserted into frame connecting plate 101;

[0044] Movable protection mechanism 200 includes: connecting guide block 201 and motor shell 202;Four connecting guide blocks 201 are provided, and the four connecting guide blocks 201 are slidingly installed outside the four circular guide rods 102, and the bottom of the four connecting guide blocks 201 is in contact with the top end of the four support springs a 103;Motor shell 202 is fixedly installed on four connecting guide blocks 201, and the bottom of motor shell 202 is in contact with the top of frame connecting plate 101;Movable protection mechanism 200 further includes: limiting clamp block 203;Two limiting clamp blocks 203 are provided, and the two limiting clamp blocks 203 are fixedly installed on motor shell 202, and the outer side of the two limiting clamp blocks 203 is respectively provided with rectangular limiting slot 2031;

[0045] Specific functions are: because four connecting threaded nails 104 are inserted on the frame connecting plate 101, the frame connecting plate 101 and the frame of the new energy vehicle are fixedly connected through the four connecting threaded nails 104; because four circular guide rods 102 are fixedly installed at the top corners of the frame connecting plate 101, four connecting guide blocks 201 are slidingly installed outside the four circular guide rods 102, and the motor shell 202 is fixedly installed on the four connecting guide blocks 201, so that the motor shell 202 can slide up and down under the action of the four circular guide rods 102 and the four connecting guide blocks 201, facilitating the installation or disassembly of the motor shell 202 by the staff;

[0046] In addition, because the four supporting springs a 103 are sleeved outside the four circular guide rods 102, and the bottoms of the four connecting guide blocks 201 are in contact with the tops of the four supporting springs a 103, the motor shell 202 and the parts on the motor shell 202 are supported, so that the hands of the staff do not need to be inserted into the frame of the new energy vehicle, avoiding the hands of the staff from being pinched.

[0047] In the embodiment of the present disclosure, as shown in Figure 5 , Figure 7 and Figure 8 , the limiting and pressing mechanism 300 comprises: three circular mounting columns 301, a movable mounting plate 302 and a limiting and pressing frame 303; the three circular mounting columns 301 are fixedly installed in the rectangular groove holes on the frame connecting plate 101; the movable mounting plate 302 is slidingly installed outside the three circular mounting columns 301; the limiting and pressing frame 303 is fixedly installed on the inner side of the movable mounting plate 302, and the inner end of the limiting and pressing frame 303 is provided with a round corner; the inner end of the limiting and pressing frame 303 is inserted into the rectangular limiting groove 2031, and the bottom of the limiting and pressing frame 303 is in contact with the top of the two connecting threaded nails 104; the limiting and pressing mechanism 300 further comprises: three supporting springs b 304 and a U-shaped separation handle 305; the three supporting springs b 304 are sleeved outside the three circular mounting columns 301, and the three supporting springs b 304 are located on the outer side of the movable mounting plate 302; the U-shaped separation handle 305 is fixedly installed on the top of the limiting and pressing frame 303;

[0048] Specific action is: because two limit compression frame 303 fixedly installed in the inner side of two movable mounting plate 302, and the inner end of two limit compression frame 303 is provided with a round corner, and the inner end of two limit compression frame 303 is inserted in two rectangular limit slot 2031, the motor housing 202 is limited, the bottom of motor housing 202 is in contact with the top of frame connecting plate 101;Because two U-shaped separation handle 305 is fixedly installed on the top of limit compression frame 303, when two limit compression frame 303 needs to be separated from two rectangular limit slot 2031, the staff pulls two U-shaped separation handle 305 outward;

[0049] In addition, because six support springs b304 is sleeved on the outside of six circular mounting column 301, and six support springs b304 is located on the outside of two movable mounting plate 302, two movable mounting plate 302 is elastically supported, so that two limit compression frame 303 only moves under stress;Because the bottom of two limit compression frame 303 is in contact with the top of four connecting threaded nails 104, four connecting threaded nails 104 is compressed, so that four connecting threaded nails 104 is avoided loose;When the inner end of two limit compression frame 303 is separated from two rectangular limit slot 2031, two limit compression frame 303 can also move inward a distance under the action of six support springs b304, so that the bottom of two limit compression frame 303 is separated from four connecting threaded nails 104, which does not hinder the disassembly and installation of four connecting threaded nails 104.

[0050] In the embodiments of the present disclosure, as Figure 9 and Figure 10As shown, the auxiliary protection mechanism 400 comprises: two rectangular protection plates 401, two circular guide shafts 402 and a movable mounting block 403; the two rectangular protection plates 401 are fixedly installed on the top of the motor housing 202; the two circular guide shafts 402 are fixedly installed on the two rectangular protection plates 401; the movable mounting block 403 is slidingly installed outside the two circular guide shafts 402; the auxiliary protection mechanism 400 further comprises: four support springs c 404 and an L-shaped mounting bracket 405; the four support springs c 404 are sleeved outside the two circular guide shafts 402, and are located on the front and rear sides of the movable mounting block 403; the L-shaped mounting bracket 405 is fixedly installed on the top of the movable mounting block 403; the auxiliary protection mechanism 400 further comprises: an arc-shaped protection block a 406, an adjusting threaded column 407 and an arc-shaped protection block b 408; the arc-shaped protection block a 406 is fixedly installed on the top of the movable mounting block 403; the adjusting threaded column 407 is threadedly connected to the L-shaped mounting bracket 405; the arc-shaped protection block b 408 is rotatably installed on the adjusting threaded column 407, and is located directly above the arc-shaped protection block a 406, and the inner walls of the arc-shaped protection block a 406 and the arc-shaped protection block b 408 are respectively provided with a row of tapered protrusions;

[0051] Specifically, since the arc-shaped protection block a 406 is fixedly installed on the top of the movable mounting block 403, the adjusting threaded column 407 is threadedly connected to the L-shaped mounting bracket 405, and the arc-shaped protection block b 408 is rotatably installed on the adjusting threaded column 407, when the adjusting threaded column 407 is rotated by the worker, the arc-shaped protection block b 408 moves downward to compress the motor wires;

[0052] In addition, since the two circular guide shafts 402 are fixedly installed on the two rectangular protection plates 401, and the movable mounting block 403 is slidingly installed outside the two circular guide shafts 402, the movable mounting block 403 can slide on the two circular guide shafts 402; since the four support springs c 404 are sleeved outside the two circular guide shafts 402, and are located on the front and rear sides of the movable mounting block 403, the movable mounting block 403 can be automatically reset after moving, and can protect the motor wires multiple times.

[0053] The specific use mode and effect of the embodiment are as follows:

[0054] When the application is used, first, the worker fixes and connects the four connecting threaded nails 104 with the frame of the new energy vehicle through a wrench, and then slides and installs the four connecting guide blocks 201 outside the four circular guide rods 102, so that the motor shell 202 can slide up and down under the action of the four circular guide rods 102 and the four connecting guide blocks 201, facilitating the worker to install or dismount the motor shell 202; the top ends of the four supporting springs a 103 are in contact, supporting the motor shell 202 and the parts on the motor shell 202, so that the worker's hands do not need to be inserted into the frame of the new energy vehicle, avoiding the worker's hands from being pinched; the wires on the motor are placed between the arc-shaped protection blocks a 406 and the arc-shaped protection blocks b 408, and then the worker rotates the adjusting threaded column 407 through the wrench, and when the worker rotates the adjusting threaded column 407, the arc-shaped protection blocks b 408 move downward, compacting the wires on the motor; the setting of the four supporting springs c 404 enables the movable mounting block 403 to automatically reset after moving, and enables the motor wires to be protected multiple times;

[0055] The worker presses the motor shell 202 downward, the inner ends of the two limiting and compacting frames 303 are inserted into the two rectangular limiting grooves 2031, compacting the motor shell 202, and the bottom of the motor shell 202 is in contact with the top of the frame connecting plate 101; the setting of the six supporting springs b 304 elastically supports the two movable mounting plates 302, so that the two limiting and compacting frames 303 only move after being stressed;

[0056] When the motor shell 202 needs to be dismounted, the worker pulls out the two U-shaped separation handles 305, the inner ends of the two limiting and compacting frames 303 are separated from the two rectangular limiting grooves 2031, and when the inner ends of the two limiting and compacting frames 303 are separated from the two rectangular limiting grooves 2031, the two limiting and compacting frames 303 can still move inward a distance under the action of the six supporting springs b 304, the bottom of the two limiting and compacting frames 303 is separated from the four connecting threaded nails 104, and the dismounting and installation of the four connecting threaded nails 104 are not hindered.

[0057] In this paper, the following points need attention:

[0058] 1. The drawings of the embodiments of the present disclosure only relate to the structures involved in the embodiments of the present disclosure, and other structures can refer to the usual design.

[0059] 2. In the case of no conflict, the embodiments of the present disclosure and the features in the embodiments can be combined with each other to obtain new embodiments.

[0060] The above merely describes specific embodiments of the present disclosure, but the protection scope of the present disclosure is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present disclosure, which should be covered within the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be subject to the protection scope of the claims.

Claims

1. A protective structure for a new energy vehicle motor, comprising: The system comprises a connecting positioning mechanism (100), a movable protective mechanism (200), a limiting clamping mechanism (300), and an auxiliary protection mechanism (400); characterized in that the movable protective mechanism (200) is installed outside the connecting positioning mechanism (100), and the connecting positioning mechanism (100) is used to improve the installation and disassembly efficiency of the movable protective mechanism (200); the limiting clamping mechanism (300) is provided in two sets, and the two sets of limiting clamping mechanisms (300) are installed on the connecting positioning mechanism (100), the two sets of limiting clamping mechanisms (300) are used to prevent the connecting positioning mechanism (100) from loosening, and the two sets of limiting clamping mechanisms (300) are also used to limit the movable protective mechanism (200); the auxiliary protection mechanism (400) is installed on the top of the movable protective mechanism (200), and the auxiliary protection mechanism (400) is used to protect the wires on the motor; The connecting positioning mechanism (100) includes: a frame connecting plate (101) and connecting threaded pins (104); there are four connecting threaded pins (104), and the four connecting threaded pins (104) are inserted into the frame connecting plate (101); the movable protection mechanism (200) includes: a motor housing (202) and a limiting block (203); there are two limiting blocks (203), and the two limiting blocks (203) are fixedly installed on the motor housing (202), and rectangular limiting grooves (2031) are respectively opened on the outer side of the two limiting blocks (203); The limiting clamping mechanism (300) includes: a circular mounting post (301), a movable mounting plate (302), a limiting clamping frame (303), a support spring b (304), and a U-shaped separation handle (305); the limiting clamping frame (303) is fixedly installed on the inner side of the movable mounting plate (302), and the inner end of the limiting clamping frame (303) is provided with rounded corners; the inner end of the limiting clamping frame (303) is inserted into the rectangular limiting groove (2031), and the bottom of the limiting clamping frame (303) contacts the top of two connecting threaded nails (104); there are three support springs b (304), and the three support springs b (304) are sleeved on the outside of the three circular mounting posts (301), and the three support springs b (304) are located on the outside of the movable mounting plate (302); the U-shaped separation handle (305) is fixedly installed on the top of the limiting clamping frame (303).

2. The protective structure for a new energy vehicle motor according to claim 1, characterized in that, The connection positioning mechanism (100) further includes: a circular guide rod (102); two rectangular slots are provided on the frame connecting plate (101); there are four circular guide rods (102) in total, and the four circular guide rods (102) are fixedly installed at the top corner of the frame connecting plate (101), and the top of the two circular guide rods (102) are rounded.

3. The protective structure for a new energy vehicle motor according to claim 2, characterized in that, The connection positioning mechanism (100) further includes: support spring a (103); there are four support springs a (103), and the four support springs a (103) are sleeved on the outside of the four circular guide rods (102).

4. The protective structure for a new energy vehicle motor according to claim 3, characterized in that, The active protection mechanism (200) further includes: connecting guide blocks (201); there are four connecting guide blocks (201), and the four connecting guide blocks (201) are slidably installed on the outside of the four circular guide rods (102), and the bottom of the four connecting guide blocks (201) contacts the top of the four support springs a (103); the motor housing (202) is fixedly installed on the four connecting guide blocks (201), and the bottom of the motor housing (202) contacts the top of the frame connecting plate (101).

5. A protective structure for a new energy vehicle motor according to claim 1, characterized in that, There are three circular mounting posts (301), and the three circular mounting posts (301) are fixedly installed in the rectangular slots on the frame connecting plate (101); the movable mounting plate (302) is slidably installed on the outside of the three circular mounting posts (301).

6. The protective structure for a new energy vehicle motor according to claim 1, characterized in that, The auxiliary protection mechanism (400) includes: a rectangular protection plate (401), a circular guide shaft (402), and a movable mounting block (403); there are two rectangular protection plates (401), and the two rectangular protection plates (401) are fixedly installed on the top of the motor housing (202); there are two circular guide shafts (402), and the two circular guide shafts (402) are fixedly installed on the two rectangular protection plates (401); the movable mounting block (403) is slidably installed on the outside of the two circular guide shafts (402).

7. A protective structure for a new energy vehicle motor according to claim 6, characterized in that, The auxiliary protection mechanism (400) further includes: support springs c (404) and L-shaped mounting brackets (405); there are four support springs c (404), and the four support springs c (404) are sleeved on the outside of the two circular guide shafts (402), and the four support springs c (404) are located on the front and rear sides of the movable mounting block (403); the L-shaped mounting brackets (405) are fixedly installed on the top of the movable mounting block (403).

8. A protective structure for a new energy vehicle motor according to claim 7, characterized in that, The auxiliary protection mechanism (400) further includes: an arc-shaped protection block a (406), an adjusting threaded column (407), and an arc-shaped protection block b (408); the arc-shaped protection block a (406) is fixedly installed on the top of the movable mounting block (403); the adjusting threaded column (407) is threadedly connected to the L-shaped mounting bracket (405); the arc-shaped protection block b (408) is rotatably installed on the adjusting threaded column (407), and the arc-shaped protection block b (408) is located directly above the arc-shaped protection block a (406), and the inner walls of the arc-shaped protection block a (406) and the arc-shaped protection block b (408) are respectively provided with a row of conical protrusions.

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