Accurate grinding tool for carbon brush of generator

Abstract

The utility model discloses an accurate grinding tool for a generator carbon brush, and belongs to the technical field of carbon brush grinding. Comprising an arc-shaped template and abrasive paper covering the arc-shaped template. A brush carrier is arranged above the arc-shaped template in a sliding mode and slides in the axial direction of the arc-shaped template. According to the utility model, the grinding process of the bottom radian of the carbon brush can be accurately controlled, and the ignition condition of the carbon brush caused by overlarge grinding angle deviation is avoided. Meanwhile, the service life of the generator carbon brush is prolonged, and the self-running-in time after the carbon brush is replaced is reduced, thereby improving the working efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of carbon brush grinding technology, specifically relating to a precision grinding tool for generator carbon brushes. Background Technology

[0002] Carbon brushes, also known as electrical brushes, are widely used in many electrical devices as sliding contact components. The main materials used in carbon brush applications include graphite, resin-impregnated graphite, and metallic (including copper and silver) graphite. Carbon brushes are devices that transmit energy or signals between the stationary and rotating parts of electric motors, generators, or other rotating machinery. They are generally made of pure carbon with a solidifying agent, and are typically square in shape, held in place by a metal bracket. A spring inside presses them firmly against the rotating shaft. When the motor rotates, it transmits electrical energy to the coils through the commutator. Because their main component is carbon, they are prone to wear.

[0003] Because carbon brushes are prone to wear, replacing them is an important part of generator maintenance. During replacement, the contact area between the carbon brush and the slip ring must be at least 70%, therefore, the carbon brushes need to be ground before replacement.

[0004] In the current process of replacing generator carbon brushes, most grinding operations involve using sandpaper as a pad on the generator bearing housing or the outer circumference surface similar to the slip ring. During the grinding process, the angle at which the operator holds the carbon brush and the direction of observation can cause the carbon brush to be ground at an angle, making it difficult to operate. Repeated adjustments waste carbon brushes, increasing operation time and compromising efficiency. Furthermore, it can cause sparking due to insufficient contact area after the carbon brush is replaced. Utility Model Content

[0005] The technical problem this invention aims to solve is to overcome the shortcomings of existing technologies and provide a precision grinding tool for generator carbon brushes. This invention allows for precise control of the bottom curvature of the carbon brush during grinding, avoiding sparking caused by excessive grinding angle deviation. Simultaneously, it improves the service life of generator carbon brushes, reduces the self-break-in time after brush replacement, and thus increases work efficiency.

[0006] The technical solution adopted by this utility model to solve its existing problems is:

[0007] A precision grinding tool for generator carbon brushes, including a curved template and sandpaper covering the template.

[0008] A brush holder is slidably mounted above the arc-shaped template, and the brush holder slides along the axial direction of the arc-shaped template.

[0009] Preferably, the arc-shaped template is fixed inside the frame, and the brush holder is slidably connected to the frame.

[0010] Preferably, the frame is provided with an optical axis guide rail, and a slider is slidably connected to the optical axis guide rail, and the brush holder is connected to the slider.

[0011] Preferably, the top of the frame is provided with two optical axis guide rails, which are respectively set on both sides of the arc-shaped template.

[0012] Preferably, each optical axis guide rail has two sliders that slide on it, and a metal plate is fixedly connected to the four sliders. The metal plate has a through hole in the middle, and the brush holder is disposed inside the through hole.

[0013] Preferably, a mounting bracket is fixed above the iron plate, and the brush holder is fixedly connected to the mounting bracket.

[0014] Preferably, the size of the through hole is larger than the horizontal cross-sectional size of the brush holder, and the brush holder is fixedly connected to the mounting bracket by brush holder fixing bolts, and the brush holder fixing bolts are threadedly connected to the mounting bracket.

[0015] Preferably, the end of the optical axis guide rail is fixedly connected to the frame via a guide rail fixing bracket.

[0016] Preferably, the arc-shaped template is made of PVC material.

[0017] Preferably, the sandpaper and the arc-shaped template are detachably connected.

[0018] Compared with the prior art, the present invention has the following advantages: simple operation, the use of optical axis guide rail to restrict the reciprocating grinding of carbon brush and ensure grinding accuracy, the use of arc template to make carbon brush quickly reach the bottom arc shape, saving grinding time and the time for carbon brush and slip ring to grind automatically after replacement, simple collection of waste carbon brush dust that does not easily cause secondary pollution, and more efficient and high precision. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] Figure 1 This is a top view of the precision grinding tool for generator carbon brushes according to this utility model.

[0021] Figure 2 This is a side view of the precision grinding tool for generator carbon brushes according to this utility model.

[0022] Figure 3 This is a front view of the generator carbon brush precision grinding tool of this utility model.

[0023] In the diagram: 1-Optical axis guide rail, 2-Slider, 3-Frame, 4-Guide rail fixing bracket, 5-Sandpaper, 6-Brush holder, 7-Arc template, 8-Brush holder fixing bolt, 9-Iron plate, 901-Through hole, 10-Mounting bracket. Detailed Implementation

[0024] The specification and claims use certain terms to refer to specific components. Those skilled in the art will understand that hardware manufacturers may use different names to refer to the same component. This specification and claims do not distinguish components based on differences in name, but rather on differences in function. The term "comprising" throughout the specification and claims is an open-ended term and should be interpreted as "comprising but not limited to." "Approximately" means that within an acceptable margin of error, those skilled in the art can solve the technical problem and substantially achieve the technical effect within a certain margin of error.

[0025] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "horizontal", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0026] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0027] The attached figure shows the preferred embodiment of the precision grinding tool for generator carbon brushes. The present invention will be further described in detail below with reference to the attached figure.

[0028] The generator carbon brush precision grinding tool includes an arc-shaped template 7 and sandpaper 5 covering the arc-shaped template 7. The diameter of the outer arc surface of the arc-shaped template 7 is consistent with the diameter of the generator slip ring.

[0029] The sandpaper 5 is used to grind the carbon brushes, and therefore needs to be replaced periodically. For ease of replacement, in this embodiment, the sandpaper 5 is detachably connected to the curved template 7. The sandpaper 5 can be fixed to the curved template 7 using screws at its four corners.

[0030] A brush holder 6 is slidably mounted above the arc-shaped template 7, and a carbon brush is installed inside the brush holder 6. The brush holder 6 slides along the axial direction of the arc-shaped template 7. The brush holder 6 has a frame structure, and the carbon brush is held in place inside the brush holder 6. The bottom of the carbon brush protrudes below the brush holder 6 and abuts against the surface of the sandpaper 5.

[0031] The arc-shaped template 7 is fixed inside the frame 3, and the brush holder 6 is slidably connected to the frame 3. An optical axis guide rail 1 is mounted on the frame 3, and a slider 2 is slidably connected to the optical axis guide rail 1. The brush holder 6 is connected to the slider 2.

[0032] To ensure the stability of the brush holder 6 sliding, two optical axis guide rails 1 are mounted on the top of the frame 3. The two optical axis guide rails 1 are respectively set on both sides of the arc-shaped template 7, and the ends of the optical axis guide rails 1 are fixedly connected to the frame 3 through the guide rail fixing bracket 4.

[0033] Two sliders 2 are slidably mounted on each optical axis guide rail 1, or two sliders 2 are slidably mounted on two optical axis guide rails 1, with each slider 2 having its two ends fitted onto the two optical axis guide rails 1. All sliders 2 are fixedly connected to a common iron plate 9, which has a through hole 901 in the middle, and the brush holder 6 is disposed inside the through hole 901.

[0034] A mounting bracket 10 is fixed above the iron plate 9, and the brush holder 6 is fixedly connected to the mounting bracket 10.

[0035] The size of the through hole 901 is larger than the horizontal cross-sectional size of the brush holder 6. The brush holder 6 is fixedly connected to the mounting bracket 10 by brush holder fixing bolts 8, which are threadedly connected to the mounting bracket 10. By rotating the brush holder fixing bolts 8, the angle of the brush holder 6 can be finely adjusted, thereby controlling the angle during the reciprocating grinding of the carbon brush.

[0036] In this embodiment, the arc-shaped template 7 is made of PVC material, and the frame 3 is made of aluminum alloy or other metal, making it sturdy and reliable. During use, place the new carbon brush in the brush holder 6, adjust the brush holder fixing bolts 8, and slide it back and forth. Observe the width of the carbon brush marks ground on the gauze paper 5. When the width reaches the width of the carbon brush, the carbon brush grinding is complete. Grinding can be completed by 8-10 reciprocations of the new carbon brush, saving operation time.

[0037] The curved template 7 supports the sandpaper 5 and facilitates rapid curvature shaping. The optical axis guide rail 1 ensures that the carbon brush does not deviate in left and right angles during grinding in the brush holder 6, thus guaranteeing the grinding quality of the carbon brush. During grinding, a plastic film larger than the lower surface of the frame 3 is placed below the frame 3. Graphite dust generated during the grinding process is swept into the gap between the template and the frame using a brush for collection, making carbon brush dust recycling simple, environmentally friendly, and safe.

[0038] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. Generator carbon brush precision grinding tool, characterized by: It comprises an arc-shaped template (7) and sandpaper (5) covering the arc-shaped template (7). A brush holder (6) is slidably provided above the arc-shaped template (7), and the brush holder (6) slides along the axial direction of the arc-shaped template (7); The arc-shaped template (7) is fixed inside the frame (3), and the brush holder (6) is slidably connected to the frame (3); An optical axis guide rail (1) is mounted on the frame (3), a slider (2) is slidably connected to the optical axis guide rail (1), and the brush holder (6) is connected to the slider (2); Two optical axis guide rails (1) are mounted on the top of the frame (3), and the two optical axis guide rails (1) are respectively arranged on two sides of the arc-shaped template (7); Two sliding blocks (2) are slidably disposed on each optical axis guide rail (1); an iron plate (9) is fixedly connected between the four sliding blocks (2); a through hole (901) is disposed in the middle of the iron plate (9); and the brush holder (6) is disposed inside the through hole (901); A mounting frame (10) is fixed above the iron plate (9), and the brush frame (6) is fixedly connected to the mounting frame (10); The size of the through hole (901) is larger than the horizontal cross-sectional size of the brush holder (6), and the brush holder (6) is fixedly connected to the mounting frame (10) via a brush holder fixing bolt (8). The brush holder fixing bolt (8) is threadedly connected to the mounting frame (10).

2. The generator carbon brush precision grinding tool according to claim 1, characterized in that: The end of the optical axis guide rail (1) is fixedly connected to the frame (3) via a guide rail fixing frame (4).

3. The generator carbon brush precision grinding tool according to claim 1, characterized in that: The arc-shaped template (7) is made of PVC material.

4. The generator carbon brush precision grinding tool according to claim 1, characterized in that: The sandpaper (5) is detachably connected to the arc-shaped template (7).

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