CN218867602U - Brush holder - Google Patents

Abstract

The utility model discloses a brush holder, include: plug, brush box and brush holder shaft, the brush box is used for placing the brush, the plug can be connected with brush holder base cartridge, one side that the brush holder base was kept away from to the plug can with brush box fixed connection, the brush holder shaft rotates with the plug to be connected, the brush holder shaft can rotate around the axis that the axle was held to the brush, the one end that the axle was held to the brush is equipped with the brush holder handle, the one end that the plug is close to the brush holder handle is the operating end, be equipped with the terminal mounting hole on the operating end of plug, the terminal mounting hole is used for the erection column, the terminal is used for keeping away from the tip fixed connection of brush one end with the brush pigtail of brush on the plug. The problem of the brush box of current brush holder need participate in the electric current conduction, need adopt the good copper of electric conductive property as the main material, not only with high costs, lead to the total weight of brush holder moreover big, it can be very hard to hold the brush holder, influences operating personnel operation is overcome.

Description

Brush holder

Technical Field

The utility model relates to an electric power accessory field especially relates to brush holder.

Background

One side that the brush box of traditional brush holder is close to the plug is equipped with the connecting portion with plug fixed connection, and brush box is close to brush box plate top on one side of the plug and reserves the position that the terminal was installed, and the position that the terminal was installed is higher than the position that connecting portion were located on brush box plate, and brush holder during operation, the inside electric current of generator or motor flows into the brush box after the terminal on the brush box is flowed to the brush box through the brush pigtail from the brush, flows in the plug from the brush box again and spreads into the brush holder base at last.

Because the brush box of current brush holder needs to participate in the electric current conduction, consequently adopt the good copper of electric conductive property as the main material, this makes the manufacturing cost of brush box high to cause the brush box quality heavy, when the brush holder was installed, operating personnel need to hold the brush holder handle and insert the plug into the brush holder base, and heavy brush box has increased the gross weight of brush holder, and it can be very hard to hold the brush holder, influences operating personnel's operation.

Disclosure of Invention

The utility model provides a brush holder to overcome the brush box of current brush holder and need participate in the electric current conduction, need adopt the good copper of electric conductive property as the main material, not only with high costs, it is big to lead to the total weight of brush holder moreover, grips the brush holder and can be very hard, influences the problem of operating personnel operation.

In order to realize the purpose, the technical scheme of the utility model is that:

a brush holder, comprising: plug, brush box and brush holder shaft, the brush box is used for placing the brush, the plug can be connected with brush holder base cartridge, one side that the brush holder base was kept away from to the plug can with brush box fixed connection, the brush holder shaft rotates with the plug to be connected, the brush holder shaft can rotate around the axis that the axle was held to the brush, the one end that the axle was held to the brush is equipped with the brush holder handle, the one end that the plug is close to the brush holder handle is the operating end, be equipped with the terminal mounting hole on the operating end of plug, the terminal mounting hole is used for the erection column, the terminal is used for keeping away from the tip fixed connection of brush one end with the brush pigtail of brush on the plug.

Furthermore, the plug is provided with a horizontal taper dovetail boss.

Furthermore, the end face of the operation end of the plug is provided with at least one binding post mounting hole.

Furthermore, one side of the operating end of the plug, which is close to the brush box, is provided with at least one binding post mounting hole.

Furthermore, the brush box comprises a rear plate and a front plate, the rear plate is arranged on one side of the brush box close to the plug, and the front plate is arranged at one end of the brush box far away from the plug;

one surface of the rear plate, which is far away from the front plate, is provided with a connecting part fixedly connected with a plug, and the top end of the rear plate is not higher than the top end of the connecting part;

the rear plate and the front plate are fixedly connected through a plurality of rib plates, and one or more brush accommodating grooves are surrounded by the rear plate, the front plate and the plurality of rib plates;

the opposite face of back plate and front bezel is equipped with the pressure spring mounting groove, pressure spring mounting groove intercommunication brush holding tank.

Further, the pressure spring mounting groove comprises a front plate pressure spring mounting groove and a rear plate pressure spring mounting groove;

the front plate compression spring mounting groove is arranged on the front plate;

and a limiting bulge is arranged at the joint of the opposite surface of each rib plate and the rear plate, and the rear plate and the two opposite limiting bulges form a rear plate compression spring mounting groove in a surrounding manner.

Further, the top end of the rear plate is flush with the top end of the connecting part.

Further, the device also comprises a pressure spring, wherein the pressure spring comprises a coil spring and a spring frame;

the spring frame comprises a first supporting leg, a second supporting leg and an elastic section, wherein coil springs are arranged on opposite surfaces of the first supporting leg and the second supporting leg, one end of the elastic section is fixedly connected with the first supporting leg, the other end of the elastic section is fixedly connected with the second supporting leg, and the two coil springs are respectively fixed at one ends, far away from the elastic section, of the first supporting leg and the second supporting leg;

the utility model discloses a brush box, including first landing leg and second landing leg, brush box, handle, elastic section, brush box, first landing leg and second landing leg, the looks abscission face of first landing leg and second landing leg all is equipped with the pawl, the brush box is provided with spacing hole, the pawl can the joint in the spacing hole of brush box, the one end that first landing leg is close to the elastic section be equipped with handle fixed connection, the handle can drive the elastic section shrink under the exogenic action, the elastic section shrink can make the one end that first landing leg is close to the elastic section with the one end that the elastic section was kept away from to the second landing leg is kept away from brush box inner wall, and then makes the pawl no longer joint is at the spacing downthehole of brush box.

The utility model has the advantages that:

be equipped with the terminal mounting hole that is used for installing the terminal on the plug, compare in the plug of traditional brush holder, the brush box is no longer connected to the brush pigtail, the brush pigtail passes through terminal lug connection on the plug, the process of electric current conduction is different from traditional brush holder, the brush box does not participate in electrically conductive, make the brush box choose for use during manufacturing than copper density is littleer, the price is lower, the material that electric conductive property is weaker, can effectively reduce cost, can reduce the gross weight of brush holder so that operating personnel operates simultaneously.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.

Fig. 1 is a first schematic structural diagram of a brush holder according to embodiment 1 of the present invention;

fig. 2 is a second schematic structural view of an embodiment 1 of a brush holder disclosed in the present invention;

fig. 3 is a first schematic structural diagram of a brush holder plug disclosed in the present invention;

fig. 4 is a front view of a brush holder plug according to the present invention;

fig. 5 is a top view of a brush holder plug according to the present invention;

fig. 6 is a schematic structural diagram ii of a brush holder plug disclosed in the present invention;

fig. 7 is a schematic structural view of a brush holder base disclosed in the present invention;

fig. 8 is a first structural schematic view of a brush box of a brush holder disclosed by the invention;

FIG. 9 is a top view of a brush box of a brush holder disclosed in the present invention;

FIG. 10 is a second schematic structural view of a brush box of a brush holder according to the present invention;

fig. 11 is a schematic structural view of a compressed spring of a brush holder disclosed in the present invention;

fig. 12 is a schematic view illustrating the operation of a compressed spring of a brush holder according to the present invention;

fig. 13 is a schematic structural view of embodiment 2 of a brush holder disclosed in the present invention;

in the figure: 1. 1-1 parts of plug, 1-1 parts of binding post mounting hole, 1-2 parts of horizontal taper dovetail boss, 1-3 parts of brush holder shaft mounting hole, 1-4 parts of brush box fixing hole, 1-A parts of operation end, 1-B parts of insertion end, 2 parts of brush box, 2-1 parts of connecting part, 2-2 parts of back plate, 2-2-1 parts of back plate pressure spring limiting hole, 2-3 parts of front plate, 2-3-1 parts of front plate pressure spring limiting hole, 2-4 parts of rib plate, 2-4-1 parts of heat dissipation hole, 2-5 parts of front plate pressure spring mounting groove, 2-6 parts of back plate pressure spring mounting groove, 2-7 parts of limiting bulge, 2-8 parts of brush holding groove, 2-9 parts of connecting bolt hole, 2-10 parts of plate spring brush locking pressure plate mounting hole, 2-11 parts of through hole, 3 parts of pressure spring, 3-1, a first supporting leg, 3-2, a second supporting leg, 3-3, an elastic section, 3-4, a coil spring, 3-5, inverted teeth, 3-6, a handle, 4, a brush holder shaft, 5, a brush holder handle, 6, a leaf spring brush locking pressing plate, 6-1, a pressing head, 7, a roller shaft mechanism, 7-1, a roller shaft rod, 7-2, a roller, 8, a binding post, 9, a reset spring, A, a brush holder base, B, an electric brush, B-1, a brush braid, C, external force, C-1, a first supporting leg moving direction, C-2, a second supporting leg moving direction, D, a contact point of the first supporting leg and the brush box, E, a contact point of the second supporting leg and the brush box, and H1, and the height of a rear plate pressing spring installation groove.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

Example 1

The present embodiment provides a brush holder, as shown in fig. 1, including: the electric brush connector comprises a plug 1, a brush box 2 and a brush holding shaft 4, wherein the brush box 2 is used for placing an electric brush B, the plug 1 can be connected with a brush holding base A in a plug-in mounting manner, one side, far away from the brush holding base A, of the plug 1 can be fixedly connected with the brush box 2, the brush holding shaft 4 is rotatably connected with the plug 1, the brush holding shaft 4 can rotate around the axis of the brush holding shaft 4, a brush holding handle 5 is arranged at one end of the brush holding shaft 4, one end, close to the brush holding handle 5, of the plug 1 is an operation end 1-A, as shown in fig. 3, a binding post mounting hole 1-1 is formed in the operation end of the plug 1, the binding post mounting hole 1-1 is used for mounting a binding post 8, and the binding post 8 is used for fixedly connecting the end, far away from the electric brush B, of a brush braid B-1 of the electric brush B, to the plug 1;

the plug 1 is provided with the binding post mounting hole 1-1 for mounting the binding post 8, compared with a plug of a traditional brush holder, the brush braid B-1 of the electric brush B is not connected with the brush box 2 any more, the brush braid B-1 is directly connected onto the plug 1 through the binding post 8, the current conduction process is different from that of the traditional brush holder, and the brush box 2 does not participate in electric conduction, so that the brush box 2 can be made of a material which is lower in density, lower in price and weaker in electric conduction performance than copper, the cost can be effectively reduced, and meanwhile, the total weight of the brush holder can be reduced so that an operator can operate the brush holder conveniently.

In a specific embodiment, the terminal 8 is a hexagon socket head stud, and the braid B-1 is pressed and fixed on the plug 1 by screwing the hexagon socket head stud.

In a specific embodiment, as shown in fig. 3 and 6, a through brush holder shaft mounting hole 1-3 is formed in the middle of the plug 1, after the brush holder shaft 4 penetrates into the plug 1 from the brush holder shaft mounting hole 1-3, the brush holder shaft 4 is provided with threads and is connected with the brush holder handle 5 through the threads, an operator holds the brush holder handle 5 close to the operation end 1-a and inserts the insertion end 1-B into the brush holder base a until the plug 1 and the brush holder base a are embedded together.

In a specific embodiment, the electric brush control device is further included, and as shown in fig. 1, the electric brush control device comprises a leaf spring electric brush locking pressing plate 6 and a roller shaft mechanism 7;

the leaf spring electric brush locking pressing plate 6 is arranged between the plug 1 and the brush box 2, as shown in fig. 10, a leaf spring electric brush locking pressing plate mounting hole 2-10 capable of mounting a pin shaft is arranged on the brush box 2, so that the leaf spring electric brush locking pressing plate 6 is hinged with the brush box 2, and one end of the brush holding shaft 4, away from the brush holding handle 5, is provided with a roller shaft mechanism 7 which is in contact with the leaf spring electric brush locking pressing plate 6;

as shown in fig. 2, the roller shaft mechanism 7 includes a roller shaft 7-1 installed at one end of the brush holding shaft 4 far from the brush holding handle 5, a roller 7-2 is installed on the roller shaft 7-1, and the roller 7-2 can contact and be far from the plate spring brush locking pressing plate 6 under the driving of the roller shaft 7-1;

as shown in fig. 1, the plate spring brush locking pressing plate 6 is provided with a pressing head 6-1, when the brush holding shaft 4 rotates around the axis of the brush holding shaft 4, the brush holding shaft 4 can drive the roller shaft mechanism 7 to rotate, so that the roller 7-2 on the roller shaft rod 7-1 pushes the plate spring brush locking pressing plate 6, and the pressing head 6-1 is driven to pass through a pressing head through hole 2-11 provided in the brush box 2 shown in fig. 10 to contact and separate from a brush B placed in the brush box 2, so as to press and release the brush B;

FIG. 2 shows the starting position of the roller shaft lever 7-1, the brush holder shaft 4 drives the roller shaft lever 7-1 to rotate from the starting position to a side close to the brush box 2, the distance between the roller 7-2 and the brush box 2 is gradually shortened, the acting force of the roller 7-2 on the leaf spring brush locking pressing plate 6 is the largest when the distance between the roller 7-2 and the brush box 2 is the shortest, and the locking effect of the pressing head 6-1 on the brush B is the best;

as shown in fig. 1, a return spring 9 is provided between the brush box 2 and the leaf spring brush locking pressing plate 6, and when the brush holder shaft 4 is reversely rotated to the initial position of the roller shaft 7-1, the leaf spring brush locking pressing plate 6 is reset by the return spring 9, so that the pressing head 6-1 is separated from the brush B.

In a specific embodiment, as shown in fig. 4 and 6, the plug 1 is provided with a horizontal taper dovetail boss 1-2, the horizontal taper dovetail boss 1-2 can be inserted into a horizontal taper dovetail groove a-1 of a brush holder base a shown in fig. 7, the horizontal taper dovetail boss 1-2 is embedded with the horizontal taper dovetail groove a-1, and the horizontal taper dovetail boss 1-2 is matched with the horizontal taper dovetail groove a-1 for use, so that a conductive contact surface can be increased, and the stability of the brush holder after assembly is improved.

In a specific embodiment, as shown in fig. 5, the end face of the operation end of the plug 1 is provided with at least one terminal mounting hole 1-1, and the mounting position of the terminal 8 is shown in fig. 1.

In a specific embodiment, as shown in fig. 8, the brush box 2 comprises a back plate 2-2 and a front plate 2-3, the back plate 2-2 is disposed on one side of the brush box 2 close to the plug 1, and the front plate 2-3 is disposed on one end of the brush box 2 far from the plug 1;

one side of the rear plate 2-2, which is far away from the front plate 2-3, is provided with a connecting part 2-1 fixedly connected with the plug 1, and the top end of the rear plate 2-2 is not higher than that of the connecting part 2-1, so that after the brush box 2 is assembled on the brush holder, a certain space can be reserved between the upper part of the connecting part 2-1 and the plug 1, a position for mounting a binding post can be reserved on the plug 1, and meanwhile, the interference of a brush braid B-1 with other parts of the brush holder after the electric brush 2 is mounted is avoided;

the rear plate 2-2 and the front plate 2-3 are fixedly connected through a plurality of ribs 2-4, as shown in fig. 9, one or more brush accommodating grooves 2-8 are enclosed by the rear plate 2-2, the front plate 2-3 and the plurality of ribs 2-4;

and the opposite surfaces of the back plate 2-2 and the front plate 2-3 are provided with pressure spring mounting grooves which are communicated with the electric brush accommodating grooves 2-8.

In a specific embodiment, as shown in fig. 9, the compression spring mounting grooves include a front plate compression spring mounting groove 2-5 and a rear plate compression spring mounting groove 2-6;

the front plate compression spring mounting groove 2-5 is arranged on the front plate 2-3;

a limiting bulge 2-7 is arranged at the joint of the opposite surface of each rib plate 2-4 and the rear plate 2-2, and the rear plate 2-2 and the two opposite limiting bulges 2-7 enclose a rear plate pressure spring mounting groove 2-6;

when installing two pressure springs, two pressure springs insert in front bezel pressure spring mounting groove 2-5 and back plate pressure spring mounting groove 2-6 simultaneously, when installing single pressure spring, single pressure spring inserts in back plate pressure spring mounting groove 2-6, spacing arch 2-7 plays limiting displacement, prevent that single pressure spring from rocking and causing the pressure side to incline partially, and then reduce the potential safety hazard that causes because of the increase of brush wearing surface, the use that spacing arch 7 played is applicable to two pressure springs equally.

In a specific embodiment, a front plate pressure spring limiting hole 2-3-1 communicated with a front plate pressure spring mounting groove 2-5 is formed in the front plate 2-3, and a rear plate pressure spring limiting hole 2-2-1 communicated with a rear plate pressure spring mounting groove 2-6 is formed in the rear plate 2-2;

in order to avoid failure of the pressure spring 3 due to falling off of the brush box 2 caused by vibration and the like during operation of the motor, a plurality of inverted teeth 3-5 are arranged on the pressure spring 3, the pressure spring 3 is inserted into the front plate pressure spring mounting groove 2-5 and the rear plate pressure spring mounting groove 2-6, and the inverted teeth 3-5 are clamped in the front plate pressure spring limiting hole 2-3-1 and the rear plate pressure spring limiting hole 2-2-1, so that the pressure spring 3 and the brush box 2 are reliably fixed.

In a specific embodiment, the top end of the back plate 2-2 is flush with the top end of the connecting part 2-1, so that the processing is convenient.

In a specific embodiment, as shown in fig. 8, the heat dissipation holes 2-4-1 are formed on the rib plate 2-4, so that heat is generated by friction during the operation of the brush, and the heat dissipation holes can increase the heat dissipation efficiency of the brush box 2 and prevent local overheating from affecting the normal use of the brush holder.

In a specific embodiment, the brush box 2 is made of plastic, which has low density and low price, is suitable for manufacturing the brush box 2, and preferably is made of plastic with good heat-conducting property and high temperature resistance.

In a specific embodiment, the device further comprises a pressure spring 3, wherein the pressure spring 3 comprises a coil spring 3-4 and a spring frame;

the pressure spring 3 is installed in the brush box 2, a handle 3-6 is arranged on one side, away from the plug 1, of the pressure spring 3, the handle 3-6 is arranged on one side, away from the plug 1, of the handle 3, operation of an operator is facilitated, meanwhile interference between the handle 3-6 and other components of a brush holder is avoided, as shown in fig. 11, the spring frame comprises a first supporting leg 3-1, a second supporting leg 3-2 and an elastic section 3-3, coil springs 3-4 are arranged on opposite surfaces of the first supporting leg 3-1 and the second supporting leg 3-2, one end of the elastic section 3-3 is fixedly connected with the first supporting leg 3-1, the other end of the elastic section 3-1 is fixedly connected with the second supporting leg 3-2, and the two coil springs 3-4 are respectively fixed at one ends, away from the elastic section 3-3, of the first supporting leg 3-1 and the second supporting leg 3-2;

the two opposite surfaces of the first supporting leg 3-1 and the second supporting leg 3-2 are respectively provided with a pawl 3-5, the brush box 2 is provided with a limiting hole, the pawl 3-5 can be clamped in the limiting hole of the brush box 2, in the embodiment, the limiting holes are a front plate pressure spring limiting hole 2-3-1 and a rear plate pressure spring limiting hole 2-2-1, one end of the first supporting leg 3-1, which is close to the elastic section 3-3, is fixedly connected with a handle 3-6, the handle 3-6 can drive the elastic section 3-3 to contract under the action of external force, and the elastic section 3-3 contracts to enable one end of the first supporting leg 3-1, which is close to the elastic section 3-3, and one end of the second supporting leg 3-2, which is far away from the inner wall of the brush box 2, so that the pawl 5 is not clamped in the limiting hole of the brush box 2 any more;

when the support is installed, an operator holds the handle 3-6, inserts the first support leg 3-1 and the second support leg 3-2 into the front plate pressure spring installation groove 2-5 and the rear plate pressure spring installation groove 2-6 respectively, and is clamped and fixed with the front plate pressure spring limiting hole 2-3-1 and the rear plate pressure spring limiting hole 2-2-1 by the aid of the inverted teeth 3-5;

during disassembly, as shown in fig. 12, an operator applies an external force C to the handle 3-6, presses the handle 3-6 from the first leg 3-1 to the elastic section 3-3, the elastic section 3-3 contracts, so that one end of the first leg 3-1, which is close to the elastic section 3-3, is far away from the inner wall of the brush box 2 along the first leg movement direction C-1 with a contact point D of the first leg and the brush box as a fulcrum, and in the deformation process of the elastic section 3-3, the external force C is transmitted to the second leg 3-2, so that one end of the second leg 3-2, which is far away from the elastic section 3-3, is far away from the inner wall of the brush box 2 along the second leg movement direction C-2 with a contact point E of the second leg and the brush box as a fulcrum, and the pawl 3-5 is no longer clamped in the front plate pressure spring limiting hole 2-3-1 and the rear plate pressure spring limiting hole 2-2-1, and the operator holds the pressure spring 3-6 out of the pressure spring 3 from the brush box 2 with the handle 3-6, and the elastic section 3-3 are matched with the handle to facilitate the disassembly process;

the thickness of the second supporting leg 3-2 is far smaller than the height H1 of the rear plate pressure spring installation groove, and the inverted teeth 3-5 on the second supporting leg 3-2 can be far away from the inner wall of the brush box 2 along the thickness direction of the second supporting leg 3-2 along with the second supporting leg 3-2 in the rear plate pressure spring installation groove 2-6, so that the limiting protrusions 2-7 can not obstruct the second supporting leg 3-2 from being far away from the inner wall of the brush box 2.

In the embodiment, the brush box 2 is provided with connecting bolt holes 2-9, the plug 1 is provided with brush box fixing holes 1-4, and the brush box 2 and the plug 1 are fixed together by bolt fasteners passing through the connecting bolt holes 2-9 and the brush box fixing holes 1-4.

Example 2

The working principle and the main structure of a brush holder provided by the embodiment are the same as those of the embodiment 1, and the difference from the embodiment 1 in the structure is as follows:

in embodiment 1, the end face of the operation end of the header 1 is provided with at least one terminal mounting hole 1-1.

In the present embodiment, as shown in fig. 3, at least one terminal mounting hole 1-1 is formed at a side of the operation end of the plug 1 adjacent to the brush box 2, and the mounting position of the terminal 8 is shown in fig. 13.

The position of the wiring terminal mounting hole 1-1 can be determined according to the positions of other components on the brush holder, and on the premise of ensuring that the braid B-1 and the wiring terminal 8 do not interfere with other components on the brush holder, the position of the wiring terminal mounting hole 1-1 can be applied to any one of the embodiment 1 and the embodiment 2, or the two can be combined according to actual conditions.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims (8)

1. A brush holder, comprising: plug (1), brush box (2) and brush holder axle (4), brush box (2) are used for placing brush (B), its characterized in that, plug (1) can be connected with brush holder base (A) cartridge, one side that brush holder base (A) was kept away from in plug (1) can be with brush box (2) fixed connection, brush holder axle (4) rotate with plug (1) to be connected, brush holder axle (4) can rotate around the axis of brush holder axle (4), the one end that brush holder axle (4) was held to the brush is equipped with brush holder handle (5), the one end that plug (1) is close to brush holder handle (5) is the operation end, be equipped with terminal mounting hole (1-1) on the operation end of plug (1), terminal mounting hole (1-1) are used for installing terminal (8), terminal (8) are used for keeping away from the tip fixed connection of brush (B) one end with the brush braid (B-1) of brush (B) on plug (1).

2. A brush holder according to claim 1, characterized in that the plug (1) is provided with a horizontal tapered dovetail boss (1-2).

3. A brush holder according to claim 1, wherein the end face of the operating end of the plug (1) is provided with at least one terminal mounting hole (1-1).

4. A brush holder according to claim 1, wherein the operating end of the plug (1) is provided with at least one terminal mounting hole (1-1) at a side thereof adjacent to the brush box (2).

5. A brush holder according to claim 1, wherein the brush box (2) comprises a rear plate (2-2) and a front plate (2-3), the rear plate (2-2) being arranged at a side of the brush box (2) close to the plug (1), the front plate (2-3) being arranged at an end of the brush box (2) remote from the plug (1);

one surface of the rear plate (2-2) far away from the front plate (2-3) is provided with a connecting part (2-1) fixedly connected with the plug (1), and the top end of the rear plate (2-2) is not higher than that of the connecting part (2-1);

the rear plate (2-2) and the front plate (2-3) are fixedly connected through a plurality of rib plates (2-4), and one or more brush accommodating grooves are formed by the surrounding of the rear plate (2-2), the front plate (2-3) and the plurality of rib plates (2-4);

and the opposite surfaces of the rear plate (2-2) and the front plate (2-3) are provided with pressure spring mounting grooves which are communicated with the electric brush accommodating groove.

6. The brush holder according to claim 5, wherein the compression spring mounting grooves include a front plate compression spring mounting groove (2-5) and a rear plate compression spring mounting groove (2-6);

the front plate compression spring mounting groove (2-5) is arranged on the front plate (2-3);

and a limiting bulge (2-7) is arranged at the joint of the opposite surface of each rib plate (2-4) and the rear plate (2-2), and the rear plate (2-2) and the two opposite limiting bulges (2-7) enclose a rear plate compression spring mounting groove (2-6).

7. A brush holder according to claim 5, wherein the top end of the rear plate (2-2) is flush with the top end of the connecting portion (2-1).

8. A brush holder according to claim 1, further comprising a compression spring (3), said compression spring (3) comprising a coil spring (3-4) and a spring holder;

the spring frame comprises a first supporting leg (3-1), a second supporting leg (3-2) and an elastic section (3-3), wherein a handle is arranged on one side, far away from the plug (1), of the pressure spring (3), the spring frame comprises the first supporting leg (3-1), the second supporting leg (3-2) and the elastic section (3-3), coil springs (3-4) are arranged on opposite surfaces of the first supporting leg (3-1) and the second supporting leg (3-2), one end of the elastic section (3-3) is fixedly connected with the first supporting leg (3-1), the other end of the elastic section (3-3) is fixedly connected with the second supporting leg (3-2), and the two coil springs (3-4) are respectively fixed at one ends, far away from the elastic section (3-3), of the first supporting leg (3-1) and the second supporting leg (3-2);

the brush box is characterized in that inverted teeth (3-5) are arranged on the surfaces, away from each other, of the first supporting leg (3-1) and the second supporting leg (3-2), a limiting hole is formed in the brush box (2), the inverted teeth (3-5) can be clamped in the limiting hole of the brush box (2), one end, close to the elastic section (3-3), of the first supporting leg (3-1) is fixedly connected with a handle, the handle can drive the elastic section (3-3) to contract under the action of external force, the elastic section (3-3) contracts to enable one end, close to the elastic section (3-3), of the first supporting leg (3-1) and one end, far away from the elastic section (3-3), of the second supporting leg (3-2) to be far away from the inner wall of the brush box (2), and the inverted teeth (3-5) are not clamped in the limiting hole of the brush box (2) any more.

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