CN211088708U

CN211088708U - Electric tool carbon brush wear power-off device

Info

Publication number: CN211088708U
Application number: CN202020059632.6U
Authority: CN
Inventors: 胡丽姬; 吴浩东; 任世友
Original assignee: ZHEJIANG BODA INDUSTRIAL CO LTD
Current assignee: ZHEJIANG BODA INDUSTRIAL CO LTD
Priority date: 2020-01-13
Filing date: 2020-01-13
Publication date: 2020-07-24
Anticipated expiration: 2030-01-13

Abstract

The utility model discloses an electric tool carbon brush abrasion power-off device, which comprises a shell, a stator, a rotor, a commutator, a carbon brush holder, a carbon brush and a coil spring, wherein the two sides of the shell are provided with carbon brush seats matched with the commutator, the carbon brush holder is correspondingly fixed on the carbon brush seats, the carbon brush holder is provided with a carbon brush sliding sleeve, the side wall of the carbon brush sliding sleeve is provided with a limiting groove, the carbon brush is arranged on the carbon brush sliding sleeve, the coil spring is arranged on the carbon brush holder, a free end pressure head of the coil spring extends into the carbon brush sliding sleeve from the limiting groove and presses the base part of the carbon brush, and a working part of the compressed carbon brush is tightly attached to; when the working part of the carbon brush is worn, the spring piece of the pressure head at the free end of the coil spring is abutted against the bottom of the limiting groove, the pressure of the coil spring on the carbon brush is eliminated, and the carbon brush is separated from the commutator and is powered off. After adopting this structure, have simple structure reasonable, production and processing is convenient, the carbon brush is extravagant few, use reliable and stable, protection effect advantage such as good.

Description

Electric tool carbon brush wear power-off device

Technical Field

The utility model relates to an electric tool motor technical field, especially an electric tool carbon brush wearing and tearing power-off device that can automatic shutdown after carbon brush wearing and tearing.

Background

The carbon brush is a sliding contact part for transmitting electric energy by an electric tool, is processed by conductive materials such as carbon powder, copper powder and a coagulant, and can be longitudinally and slidably arranged on a carbon brush frame, the carbon brush frame is provided with a coil spring and is tightly pressed on a commutator of a motor through the coil spring, the existing carbon brush has a simple structure, the vibration force generated by the rotation of the motor is large, and when the carbon brush is worn, the commutator iron is seriously damaged due to untimely replacement, so that the service life of the motor is shortened; in order to prevent the carbon brush from damaging the commutator after being worn, some people replace the carbon brush when the carbon brush is not completely worn, which causes serious waste of the carbon brush and greatly increases the use cost. At present, a power-off device is also arranged on the market, but the structure is complex, the requirement on the matching precision is high, the production difficulty is large, the work is unstable, the effect cannot be achieved frequently, and the further improvement is needed. Aiming at the problems, many manufacturers and acquaintances develop and develop the products, but no ideal products are seen.

Disclosure of Invention

In order to overcome the defects existing in the prior art, the utility model aims to provide an electric tool carbon brush abrasion power-off device which has the advantages of simple and reasonable structure, convenient production and processing, less waste of carbon brushes, stable and reliable use and good protection effect.

The utility model provides a technical scheme that above-mentioned technical problem adopted, it includes the casing, fix stator on the casing, rotatable install on the casing and with stator complex rotor, fix commutator, carbon brush holder, carbon brush, coil spring on the rotor, the bilateral symmetry of casing is equipped with the carbon brush seat that matches with the commutator, carbon brush holder corresponds and fixes on carbon brush seat, be equipped with the carbon brush sliding sleeve on the carbon brush holder, be equipped with the spacing groove on the lateral wall of carbon brush sliding sleeve, the carbon brush activity sets up on the carbon brush sliding sleeve, be equipped with the recess that matches with coil spring free end pressure head on the basal portion of carbon brush, the coil spring is installed on carbon brush holder, the coil spring free end pressure head stretches into the carbon brush sliding sleeve from the spacing groove and presses on the recess of carbon brush basal portion, the carbon brush working portion after the compression hugs closely on the commutator; when the working part of the carbon brush is worn, the spring piece of the pressure head at the free end of the coil spring is abutted against the bottom of the limiting groove, the pressure of the coil spring on the carbon brush is eliminated, and the carbon brush is separated from the commutator and is powered off.

In a further aspect of the present invention, a braid electrically connected to the controller is fixed to the base of the carbon brush.

The utility model discloses a further scheme, the casing on be fixed with the back shroud, the carbon brush of installing on the carbon brush seat is covered to the back shroud.

After adopting above-mentioned structure, compare with prior art and have following advantage and effect: because the free end pressure head of the coil spring extends into the carbon brush sliding sleeve from the limiting groove and presses the groove of the carbon brush base, the pressed carbon brush working part is tightly attached to the commutator, when the carbon brush working part is worn, the spring piece of the free end pressure head of the coil spring abuts against the bottom of the limiting groove, the pressure of the coil spring on the carbon brush is eliminated, the carbon brush and the commutator are automatically separated and powered off, the structure is simple, the separation is reliable, the use effect is good, the carbon brush can play the greatest role, the use cost is reduced, the commutator can be prevented from being damaged, and the service life of the electric tool is prolonged.

Drawings

Fig. 1 is a schematic view of the fitting structure of the present invention.

Fig. 2 is a schematic view of the exploded structure of the present invention.

Fig. 3 is a schematic view of the matching structure of the carbon brush in the initial state of the carbon brush of the present invention.

Fig. 4 is a schematic view of the matching structure of the carbon brush of the present invention in the end state.

The motor comprises a shell 1, a stator 2, a rotor 3, a commutator 4, screws 5, a carbon brush holder 6, a coil spring 7, a carbon brush 8, a rear cover cap 9, a bearing 10, a carbon brush holder 11, a limiting groove 12, a carbon brush sliding sleeve 13, a groove 14 and a brush braid 15.

Detailed Description

Fig. 1 to 4 show an embodiment of a carbon brush wear power-off device for an electric tool according to the present invention, which includes a housing 1, a stator 2 fixed on the housing 1, a rotor 3 rotatably mounted on the housing 1 through a bearing 10 and cooperating with the stator 2, a commutator 4 fixed on the rotor 3, a carbon brush holder 6, a carbon brush 8, and a coil spring 7, wherein the housing 1 is symmetrically provided with carbon brush holders 11 matching with the commutator 4 at both sides, the carbon brush holder 6 is correspondingly fixed on the carbon brush holders 11 through screws 5, the carbon brush holder 6 is provided with a carbon brush sliding sleeve 13, a side wall of the carbon brush sliding sleeve 13 is provided with a limiting groove 12, the carbon brush 8 is movably arranged on the carbon brush sliding sleeve 13, a groove 14 matching with a free end pressure head of the coil spring 7 is provided on a base portion of the carbon brush 8, the coil spring 7 is mounted on the carbon brush holder 3, the free end pressure head of the coil spring 4 extends into the carbon brush sliding sleeve 13 from the limiting groove, the working part of the carbon brush 8 after being pressed is tightly attached to the commutator 4; when the working part of the carbon brush 8 is worn, the spring piece of the pressure head at the free end of the coil spring 7 abuts against the bottom of the limiting groove 12, the pressure of the coil spring 7 on the carbon brush 8 is eliminated, and the carbon brush 8 is separated from the commutator 4 and powered off. The shell 1 is fixed with a rear cover 9, and the rear cover 9 covers the carbon brush 8 arranged on the carbon brush seat 11.

In order to facilitate the electrical connection of the carbon brush 8, a braid 15 electrically connected with a controller is fixed on the base of the carbon brush 8.

The above description is only the specific embodiment of the present invention, and is not intended to limit the present invention in any form, and the present invention does not depart from the technical solution of the present invention, and the made simple modification, equivalent change or modification all fall into the protection scope of the present invention.

Claims

1. The utility model provides an electric tool carbon brush wearing and tearing outage device, includes casing (1), fixes stator (2) on casing (1), rotatable the installation on casing (1) and with stator (2) complex rotor (3), fix commutator (4), carbon brush frame (6), carbon brush (8), disc spring (7) on rotor (3), characterized by: carbon brush seats (11) matched with the commutator (4) are symmetrically arranged on two sides of the shell (1), a carbon brush frame (6) is correspondingly fixed on the carbon brush seats (11), a carbon brush sliding sleeve (13) is arranged on the carbon brush frame (6), a limiting groove (12) is arranged on the side wall of the carbon brush sliding sleeve (13), a carbon brush (8) is movably arranged on the carbon brush sliding sleeve (13), a groove (14) matched with a free end pressure head of the coil spring (7) is arranged on the base part of the carbon brush (8), the coil spring (7) is arranged on the carbon brush frame (6), the free end pressure head of the coil spring (7) extends into the carbon brush sliding sleeve (13) from the limiting groove (12) and presses the groove (14) on the base part of the carbon brush (8), and the working part of the pressed carbon brush (8) is tightly attached to the commutator (4); when the working part of the carbon brush (8) is worn, the spring piece of the pressure head at the free end of the coil spring (7) is abutted against the bottom of the limiting groove (12), the pressure of the coil spring (7) on the carbon brush (8) is eliminated, and the carbon brush (8) is separated from the commutator (4) to cut off the power.

2. The carbon brush abrasion power-off device of the electric tool as claimed in claim 1, wherein: and a brush braid (15) electrically connected with a controller is fixed on the base of the carbon brush (8).

3. The carbon brush abrasion power-off device of the electric tool as claimed in claim 1 or 2, wherein: the carbon brush is characterized in that a rear cover cap (9) is fixed on the shell (1), and the rear cover cap (9) covers the carbon brush (8) installed on the carbon brush seat (11).