CN114865487A

CN114865487A - Dirt-proof power equipment box for electric power

Info

Publication number: CN114865487A
Application number: CN202210518474.XA
Authority: CN
Inventors: 张著峰; 汪嵬; 程时润; 周亦夫; 郑景文; 李艳梅; 夏季; 沈若; 谢惠君; 曹若珊
Original assignee: Ezhou Power Supply Co of State Grid Hubei Electric Power Co Ltd
Current assignee: Ezhou Power Supply Co of State Grid Hubei Electric Power Co Ltd
Priority date: 2022-05-13
Filing date: 2022-05-13
Publication date: 2022-08-05

Abstract

The invention discloses a dustproof electric power equipment box, which belongs to the technical field of electric power equipment boxes and comprises a supporting plate, wherein a distribution box is fixedly arranged in the middle of the supporting plate, the front end of the distribution box is hinged with a door plate, a mesh cover top plate is fixedly connected above the distribution box, a baffle component is arranged around the distribution box, a fixed plate is fixedly connected to the surface of the supporting plate, a dustproof component is arranged on the fixed plate, a first magnetic block is fixedly connected to the side surface of the fixed plate, a second magnetic block is adsorbed to the side surface of the first magnetic block, a limiting plate is fixedly connected to the surface of the second magnetic block, an electric push rod is fixedly connected to the side surface of the supporting plate, one baffle is moved by a traction component on the device to drive the other baffles to move simultaneously, so that the device can expand or contract the baffles at multiple positions simultaneously, the enclosure can be automatically deployed when the distribution box is moved to a proper position.

Description

Dirt-proof power equipment box for electric power

Technical Field

The invention relates to the technical field of power equipment boxes, in particular to a dustproof power equipment box.

Background

The power equipment box is a common power distribution facility and is used for controlling the on-off of a circuit of electric equipment, the power equipment box is generally composed of a box body and supporting equipment of electric elements, the power equipment box can play the functions of isolation and safety protection, and the existing power equipment box has some defects when in use.

For example, the publication No. CN202010472698.2 discloses a dustproof electric power equipment box, in which a partition board is arranged in the box body to divide the box body into an upper chamber and a lower chamber, and the partition board is filled with a neutral desiccant to keep the inner cavity of the box body dry; the base is equipped with the dust of first dustproof construction through the rotation of draught fan one under with the box dust of cavity adsorb to the dustproof area on, the dustproof area rotates, and the friction through the sponge layer falls the dust clearance on the dustproof area, reaches the purpose of cavity under the clearance. The top cap is equipped with the second dustproof mechanism, through the rotation of draught fan two with the draught fan three for the dust is adsorbed on the dust screen along the passageway of top cap, reaches the purpose of the upper chamber of clearance box. Although the power box can achieve the function of cleaning dust, after the power box is installed, a fence needs to be additionally arranged on the ground around, the power box is inconvenient to use, and the fence cannot be automatically additionally arranged after the power box is moved to a specified position.

Disclosure of Invention

This section is for the purpose of summarizing some aspects of embodiments of the invention and to briefly introduce some preferred embodiments, and in this section as well as in the abstract and the title of the invention of this application some simplifications or omissions may be made to avoid obscuring the purpose of this section, the abstract and the title of the invention, and such simplifications or omissions are not intended to limit the scope of the invention.

The invention is provided in view of the problems existing in the existing power equipment box.

To solve the above technical problem, according to an aspect of the present invention, the present invention provides the following technical solutions: the utility model provides a dirt-proof power equipment box for electric power, which comprises a supporting plate, the centre fixed mounting of backup pad has the block terminal, the front end of block terminal articulates there is the door plant, the top fixedly connected with screen panel roof of block terminal, be provided with all around of block terminal and enclose the fender subassembly, the fixed surface of backup pad is connected with the fixed plate, install dustproof subassembly on the fixed plate, the first magnetic path of side fixedly connected with of fixed plate, the side adsorption of first magnetic path has the second magnetic path, the fixed surface of second magnetic path is connected with the limiting plate, the side fixedly connected with electric putter of backup pad, electric putter's front end fixedly connected with pulls the steel cable.

As a preferable aspect of the dustproof power equipment box of the present invention, there is provided: the enclosure assembly comprises a first enclosure, a second enclosure, a third enclosure and a fourth enclosure; the first enclosure is slidably mounted on the front side of the support plate, the second enclosure is slidably mounted on the left side of the support plate, the third enclosure is slidably mounted on the rear side of the support plate, and the fourth enclosure is slidably mounted on the right side of the support plate.

As a preferable aspect of the dustproof power equipment box of the present invention, there is provided: first enclose fender, second enclose fender, third enclose fender and fourth enclose fender mutually perpendicular between two liang, first enclose fender, second enclose fender, third enclose the equal fixedly connected with slider in bottom that fender and fourth enclosed, the first slider that encloses the fender bottom links to each other with the end of pulling the steel cable, is sliding connection between slider and the backup pad.

As a preferable aspect of the dustproof power equipment box of the present invention, there is provided: the first fender that encloses constitutes sliding construction through between traction steel cable and the backup pad, and traction steel cable is connected with the first slider that encloses the fender bottom through the leading wheel direction, is connected for rotating between leading wheel and the backup pad, and traction steel cable's outside cover is equipped with the spring, and the head and the tail both ends of spring link to each other with backup pad and first fender that encloses respectively.

As a preferable aspect of the dustproof power equipment box of the present invention, there is provided: the second encloses that fender, third enclose that keep off and fourth enclose that the fender all encloses through first and constitute sliding construction between fender and the backup pad, and first encloses to keep off and passes through to constitute elastic construction between spring and the backup pad, and the opening has been seted up to the first front end that encloses the fender, and the position of opening corresponds mutually with the position of door plant.

As a preferable aspect of the dustproof power equipment box of the present invention, there is provided: the dustproof assembly comprises a screen plate and a fixed shaft; the fixed plate is fixedly provided with a fixed shaft, the outer side of the fixed shaft is rotatably provided with an outer barrel, the outer barrel is fixedly provided with a screen plate, the front end of the screen plate is fixedly connected with a connecting rod, and a pull rope is fixedly connected below the connecting rod.

As a preferable aspect of the dustproof power equipment box of the present invention, there is provided: the screen plate is fixedly connected with the second magnetic blocks, the second magnetic blocks are distributed on the screen plate at equal intervals, the first magnetic blocks are distributed on the fixing plate at equal intervals, and the first magnetic blocks correspond to the second magnetic blocks one to one.

As a preferable aspect of the dustproof power equipment box of the present invention, there is provided: the outside cover of fixed axle is equipped with the torsional spring, and the head and the tail both ends of torsional spring link to each other with urceolus and fixed axle respectively, and the urceolus passes through to constitute elastic construction between torsional spring and the fixed axle, and the recess has been seted up in the outside of urceolus, and the inside laminating of recess is provided with the fixture block, and the fixture block passes through the leaf spring and links to each other with the fixed plate, and the shape of recess is the spherical crown shape.

As a preferable aspect of the dustproof power equipment box of the present invention, there is provided: the side face of the second magnetic block is fixedly connected with a limiting plate, the limiting plate is arc-shaped, the circle center of the arc corresponding to the limiting plate is located on the central axis of the fixing shaft, and the limiting plate penetrates through the first magnetic block and the fixing plate.

Compared with the prior art, the invention has the beneficial effects that:

1. enclose the fender through four of angular distribution such as setting up for the device can expand all around through the traction assembly on the device and electric putter is automatic after removing the block terminal to the assigned position, thereby make the device can expand the fender expansion to enclosing all around automatically when using, follow-up also can be through adjusting the length of electric putter, solved current power equipment box need add the rail on every side after the installation and use very inconvenient defect, have the advantage that the convenience is stronger.

2. Through dustproof subassembly and the limiting plate on the device for device is all around encloses to keep off opening the back, supports the limiting plate through enclosing the fender, makes the limiting plate by outside to open, thereby makes first magnetic path and second magnetic path separation, and the otter board on the device makes progress and turns under the effect of torsional spring is automatic this moment, thereby gives and makes the otter board cover the block terminal automatically, has realized that the expansion encloses the function that the automatic dustproof otter board that expandes after keeping off, has promoted the functionality of device.

3. Through the inside fixture block of dustproof subassembly, leaf spring and recess for the otter board is at the pivoted in-process, and the leaf spring on the fixed plate and the fixture block of leaf spring front end can remove in recess everywhere, thereby make the fixture block continuously strike the inner wall of recess when the device can rotate the otter board, realize vibrating the function of otter board, thereby at the in-process of expansion or accomodating the otter board, shake off the laying dust on the otter board automatically, promoted the result of use of device.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the present invention will be described in detail with reference to the accompanying drawings and detailed embodiments, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise. Wherein:

fig. 1 is a schematic view of the overall structure of a dustproof power equipment box according to the present invention;

FIG. 2 is a schematic top view of a dustproof power equipment box according to the present invention;

FIG. 3 is a schematic view of a connection structure of a supporting base and a first enclosure of a dustproof power equipment box according to the present invention;

FIG. 4 is a schematic top view of a first enclosure of a dustproof power equipment box according to the present invention;

FIG. 5 is a schematic view of the structure of the power equipment box for dust prevention of the present invention at A in FIG. 4;

FIG. 6 is a schematic view of a connection structure of a fixed plate and a screen plate of a dustproof power equipment box according to the present invention;

fig. 7 is a schematic view of the structure of the dustproof power equipment box of fig. 6 at B.

Reference numbers in the figures: 1. a support plate; 2. a distribution box; 3. a door panel; 4. a mesh enclosure top plate; 5. an enclosure assembly; 501. a first enclosure; 502. a second enclosure; 503. a third enclosure; 504. a fourth enclosure; 6. a port; 7. a fixing plate; 8. a dust-proof assembly; 801. a screen plate; 802. a connecting rod; 803. pulling a rope; 804. a fixed shaft; 805. an outer cylinder; 806. a groove; 807. a torsion spring; 808. a clamping block; 809. a plate spring; 9. a first magnetic block; 10. a second magnetic block; 11. a limiting plate; 12. a spring; 13. a traction steel rope; 14. a guide wheel; 15. an electric push rod; 16. a slide block.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described herein, and it will be apparent to those of ordinary skill in the art that the present invention may be practiced without departing from the spirit and scope of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.

Next, the present invention will be described in detail with reference to the drawings, wherein for convenience of illustration, the cross-sectional view of the device structure is not enlarged partially according to the general scale, and the drawings are only examples, which should not limit the scope of the present invention. In addition, the three-dimensional dimensions of length, width and depth should be included in the actual fabrication.

Examples

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in fig. 1-7, a dustproof power equipment box for electric power comprises a supporting plate 1, a distribution box 2 is fixedly installed in the middle of the supporting plate 1, a door plate 3 is hinged to the front end of the distribution box 2, a mesh enclosure top plate 4 is fixedly connected above the distribution box 2, the mesh enclosure top plate 4 can play a role in ventilation and dust prevention, surrounding baffle assemblies 5 are arranged around the distribution box 2, the surrounding baffles which are distributed at equal angles around can isolate the distribution box 2, so that a safety protection function is achieved, a pedestrian is prevented from being touched by mistake, the safety of the device in use is improved, a fixing plate 7 is fixedly connected to the surface of the supporting plate 1, a dustproof assembly 8 is installed on the fixing plate 7, the fixing plate 7 is used for stably supporting the dustproof assembly 8, a first magnetic block 9 is fixedly connected to the side surface of the fixing plate 7, a second magnetic block 10 is adsorbed to the side surface of the first magnetic block 9, and the magnetic block on the device is used, the feasible fender that encloses can support dustproof component 8 voluntarily after expanding, thereby make the dust guard cover automatically, the convenience when having promoted the device use, the fixed surface of second magnetic path 10 is connected with limiting plate 11, the side fixedly connected with electric putter 15 of backup pad 1, electric putter 15's front end fixedly connected with pulls steel cable 13, electric putter 15 is at flexible in-process, can cooperate and pull steel cable 13 and make to enclose the fender and can expand or close, the convenience when having promoted the device use.

In this example, the enclosure assembly 5 comprises a first enclosure 501, a second enclosure 502, a third enclosure 503 and a fourth enclosure 504; first enclose fender 501 slidable mounting in the front side of backup pad 1, second enclose fender 502 slidable mounting in the left side of backup pad 1, the third encloses fender 503 slidable mounting in the rear side of backup pad 1, the fourth encloses fender 504 slidable mounting in the right side of backup pad 1, because the first fender 501, second enclose fender 502, third enclose fender 503 and fourth enclose fender 504 butt each other and two liang of perpendicular around the device, consequently slidable mounting's first fender 501, second enclose fender 502, third enclose fender 503 and fourth enclose fender 504 and can enclose the fender expansion back in one of them department, make all the other fender expansions through butt connection.

In this example, the first enclosure 501, the second enclosure 502, the third enclosure 503 and the fourth enclosure 504 are perpendicular to each other, the bottom of the first enclosure 501, the second enclosure 502, the third enclosure 503 and the fourth enclosure 504 are fixedly connected with a slider 16, the slider 16 at the bottom of the first enclosure 501 is connected with the end of the traction steel rope 13, the slider 16 is connected with the support plate 1 in a sliding manner, the periphery of the device is matched with the traction steel rope 13, and the device can be automatically unfolded or the periphery of the device is accommodated in the process of pulling the traction steel rope 13.

In this example, first enclose fender 501 and constitute sliding construction through between traction steel cable 13 and the backup pad 1, traction steel cable 13 leads through leading wheel 14 and is connected with the first slider 16 that encloses the fender 501 bottom, be the rotation connection between leading wheel 14 and the backup pad 1, traction steel cable 13's outside cover is equipped with spring 12, spring 12's head and the tail both ends link to each other with backup pad 1 and first fender 501 that encloses respectively, make first fender 501 that encloses can automatic re-setting under the effect of elasticity through spring 12 on the device, thereby enclose fender automatic storage around the device, leading wheel 14 makes traction steel cable 13 can stably pull first fender 501 that encloses and carry out the back-and-forth movement.

In this example, the second encloses fender 502, the third encloses fender 503 and the fourth encloses fender 504 and all encloses through the first fender 501 that encloses and constitute sliding construction between the backup pad 1, the first fender 501 that encloses passes through constitutes elastic construction between spring 12 and the backup pad 1, the first front end that encloses fender 501 has been seted up through opening 6, the position of opening 6 corresponds mutually with the position of door plant 3, through opening 6 on the device make the staff can follow opening 6 entering and open door plant 3, thereby overhaul the power box, the convenience when having promoted the device operation.

In this example, the dust-proof assembly 8 includes a mesh plate 801 and a fixing shaft 804; the fixed plate 7 is provided with a fixed shaft 804 on the surface, an outer cylinder 805 is rotatably mounted on the outer side of the fixed shaft 804, a screen plate 801 is fixedly arranged on the surface of the outer cylinder 805, a connecting rod 802 is fixedly connected to the front end of the screen plate 801, a pull rope 803 is fixedly connected to the lower portion of the connecting rod 802, and the pull rope 803 below the connecting rod 802 facilitates subsequent pulling of the screen plate 801, so that the screen plate 801 is folded, and the dustproof effect of the device is improved.

In this example, the screen plate 801 and the second magnetic block 10 are fixedly connected, the second magnetic blocks 10 are distributed on the screen plate 801 at equal intervals, the first magnetic blocks 9 are distributed on the fixing plate 7 at equal intervals, the first magnetic blocks 9 and the second magnetic blocks 10 are in one-to-one correspondence, and the screen plate 801 can be stably adsorbed on the fixing plate 7 through the first magnetic blocks 9 and the second magnetic blocks 10, so that the screen plate 801 on the device is in a storage state when not in use.

In this example, the outside cover of fixed axle 804 is equipped with torsional spring 807, the head and the tail both ends of torsional spring 807 link to each other with urceolus 805 and fixed axle 804 respectively, urceolus 805 passes through to constitute elastic structure between torsional spring 807 and the fixed axle 804, recess 806 has been seted up in the outside of urceolus 805, the inside laminating of recess 806 is provided with fixture block 808, fixture block 808 passes through leaf spring 809 and links to each other with fixed plate 7, the shape of recess 806 is the spherical crown shape, when the recess 806 of spherical crown shape makes the device can rotate at urceolus 805, make fixture block 808 reciprocate to bounce in recess 806 everywhere, thereby make the device can produce the vibration effect, and then carry out the work of shaking off of dust to the dustproof face, the functionality of device has been promoted.

In this example, the side fixedly connected with limiting plate 11 of second magnetic path 10, limiting plate 11 are circular-arcly, and the circular arc centre of a circle that limiting plate 11 corresponds is located the axis of fixed axle 804, and limiting plate 11 runs through in the inside of first magnetic path 9 and fixed plate 7, through limiting plate 11 on the device for second magnetic path 10 can stably rotate, has promoted the stability of device, and follow-up can carry out the fixed work after rotating through two sets of magnetic paths to the dustproof face on the device.

It should be noted that, the invention is a dustproof electric power equipment box for electric power, first, as shown in fig. 1-5, when the device is in use, the electric push rod 15 is shortened, so that the electric push rod 15 pulls the traction steel rope 13, the front end of the traction steel rope 13 pulls the slider 16, the slider 16 drives the first enclosure 501 at the front end of the support plate 1 to slide on the support plate 1, because the first enclosure 501, the second enclosure 502, the third enclosure 503 and the fourth enclosure 504 around the device are all connected with the support plate 1 through the slider 16 and the inclined sliding chute, and two adjacent enclosures are abutted, when the first enclosure 501 is pulled, one enclosure abuts against the adjacent enclosure, so that the second enclosure 502, the third enclosure 503 and the fourth enclosure 504 are simultaneously expanded outwards, thereby the device can be used by shortening the electric push rod 15, so that the first enclosure 501, the third enclosure 501, the fourth enclosure 504 and the fourth enclosure 504 around the device are simultaneously expanded outwards, The second enclosure 502, the third enclosure 503 and the fourth enclosure 504 are unfolded simultaneously, the unfolded enclosures enable the device to isolate the outer side of the distribution box 2, pedestrians are prevented from approaching the device, after the first enclosure 501 is unfolded, the through hole 6 can be blocked by the fixing plate 7, so that the periphery of the distribution box 2 is kept closed, the device can also enable the peripheral enclosures of the device to reset automatically under the action of the spring 12 by extending the electric push rod 15, the sliding block 16 enables the peripheral enclosures of the device to reset automatically, the automatic containing work of the enclosures is completed, after the containing, a worker can open the door plate 3 in the distribution box 2 through the through hole 6 to overhaul the inside of the distribution box 2, and the mesh enclosure top plate 4 can ensure ventilation of the distribution box 2 and can realize a heat dissipation function;

as shown in fig. 3-7, when the first enclosure 501 expands outwards and abuts against the fixed plate 7, the device can simultaneously abut against the screen plate 801, at this time, under the elastic force of the torsion spring 807, the first magnetic block 9 is separated from the second magnetic block 10, the torsion spring 807 enables the screen plate 801 and the outer cylinder 805 to rotate on the fixed plate 7 through the fixed shaft 804, so as to complete the unfolding work of the screen plate 801, in the process of unfolding the screen plate 801, the outer cylinder 805 fixture block 808 can continuously knock the inner wall of each groove 806 under the action of the plate spring 809, so as to enable the screen plate 801 to vibrate with the outer cylinder 805, so that the device can automatically unfold the screen plate 801 while unfolding the enclosure, and achieve the function of shaking off dust on the surface of the screen plate 801 through the vibration structure in the device, and after the unfolding, the worker can also complete the automatic closing of the screen plate 801 by pulling the pull rope 803 on the connecting rod 802.

While the invention has been described above with reference to an embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the various features of the disclosed embodiments of the invention may be used in any combination, provided that no structural conflict exists, and the combinations are not exhaustively described in this specification merely for the sake of brevity and resource conservation. Therefore, it is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.

Claims

1. The utility model provides a dirt-proof power equipment box for electric power, includes backup pad (1), the middle fixed mounting of backup pad (1) has block terminal (2), its characterized in that: the articulated door plant (3) that has of front end of block terminal (2), top fixedly connected with screen panel roof (4) of block terminal (2), be provided with all around of block terminal (2) and enclose fender subassembly (5), the fixed surface of backup pad (1) is connected with fixed plate (7), install dustproof subassembly (8) on fixed plate (7), the first magnetic path of side fixedly connected with (9) of fixed plate (7), the side adsorption of first magnetic path (9) has second magnetic path (10), the fixed surface of second magnetic path (10) is connected with limiting plate (11), the side fixedly connected with electric putter (15) of backup pad (1), the front end fixedly connected with of electric putter (15) pulls steel cable (13).

2. The power equipment box for dust prevention according to claim 1, characterized in that: the enclosure assembly (5) comprises a first enclosure (501), a second enclosure (502), a third enclosure (503) and a fourth enclosure (504); the first enclosing barrier (501) is slidably mounted on the front side of the support plate (1), the second enclosing barrier (502) is slidably mounted on the left side of the support plate (1), the third enclosing barrier (503) is slidably mounted on the rear side of the support plate (1), and the fourth enclosing barrier (504) is slidably mounted on the right side of the support plate (1).

3. The power equipment box for dust prevention according to claim 2, characterized in that: first enclose fender (501), second enclose fender (502), the third encloses fender (503) and fourth and encloses fender (504) mutually perpendicular between two liang, first enclose fender (501), second enclose fender (502), the third encloses fender (503) and the fourth encloses the equal fixedly connected with slider (16) in bottom that keeps off (504), first slider (16) of enclosing fender (501) bottom links to each other with the end of pulling steel cable (13), is sliding connection between slider (16) and backup pad (1).

4. The power equipment box for dust prevention according to claim 3, characterized in that: first enclose fender (501) and constitute sliding construction through between traction steel cable (13) and backup pad (1), traction steel cable (13) are connected through leading wheel (14) direction and first slider (16) of enclosing fender (501) bottom, be the rotation connection between leading wheel (14) and backup pad (1), the outside cover of traction steel cable (13) is equipped with spring (12), the head and the tail both ends of spring (12) link to each other with backup pad (1) and first fender (501) of enclosing respectively.

5. The power equipment box for dust prevention according to claim 4, characterized in that: the second encloses fender (502), the third encloses fender (503) and fourth and encloses fender (504) and all enclose through first and constitute sliding construction between fender (501) and backup pad (1), first enclose fender (501) and pass through spring (12) and constitute elastic construction between backup pad (1), first front end of enclosing fender (501) has seted up opening (6), the position of opening (6) and the position of door plant (3) correspond mutually.

6. The power equipment box for dust prevention according to claim 1, characterized in that: the dustproof assembly (8) comprises a mesh plate (801) and a fixed shaft (804); the surface of the fixing plate (7) is fixedly provided with a fixing shaft (804), the outer side of the fixing shaft (804) is rotatably provided with an outer barrel (805), the surface of the outer barrel (805) is fixedly provided with a screen plate (801), the front end of the screen plate (801) is fixedly connected with a connecting rod (802), and a pull rope (803) is fixedly connected below the connecting rod (802).

7. The power equipment box for dust prevention according to claim 6, characterized in that: the screen plate (801) is fixedly connected with the second magnetic blocks (10), the second magnetic blocks (10) are distributed on the screen plate (801) at equal intervals, the first magnetic blocks (9) are distributed on the fixing plate (7) at equal intervals, and the first magnetic blocks (9) are in one-to-one correspondence with the second magnetic blocks (10).

8. The power equipment box for dust prevention according to claim 7, characterized in that: the outer side of the fixed shaft (804) is sleeved with a torsion spring (807), the head end and the tail end of the torsion spring (807) are connected with the outer cylinder (805) and the fixed shaft (804) respectively, a groove (806) is formed in the outer side of the outer cylinder (805), a clamping block (808) is attached to the inner portion of the groove (806), the clamping block (808) is connected with the fixed plate (7) through a plate spring (809), and the groove (806) is in a spherical crown shape.

9. The power equipment box for dust prevention according to claim 7, characterized in that: the side face of the second magnetic block (10) is fixedly connected with a limiting plate (11), the limiting plate (11) is arc-shaped, the circle center of an arc corresponding to the limiting plate (11) is located on the central axis of the fixed shaft (804), and the limiting plate (11) penetrates through the first magnetic block (9) and the fixed plate (7).