A carbon brush with automatic alarm for being too short

Abstract

The present invention provides a carbon brush with automatic alarm for being too short. A carbon brush with automatic alarm for being too short includes a carbon brush and a brush pigtail on the carbon brush. The carbon brush is arranged inside a housing. A blind hole is provided on the carbon brush, and a carbon rod is arranged inside the blind hole. An insulator is arranged on the outer circumference of the carbon rod. A detection line is arranged on the carbon rod, and the detection line is electrically connected to a detection device. The brush pigtail is electrically connected to the detection device. When the carbon brush wears to the position of the carbon rod, the carbon rod forms a loop through a slip ring, the brush pigtail and the detection device to give an alarm. The detection device includes a buzzer and an indicator light. The buzzer and the indicator light are connected in series. The indicator light is electrically connected to the carbon brush. The indicator light is electrically connected to the carbon rod through a power supply. The alarm indicator light is connected in series through the carbon rod, the carbon brush and the slip ring. When the alarm indicator light is on, the manufacturing process of the present invention is very simple, the alarm action is also reliable, the structure is simple, and it is convenient to use, which is suitable for popularization and use.

Description

Technical Field

[0001] The present invention relates to the field of carbon brush detection, and more particularly to a carbon brush with automatic short-length alarm. Background Art

[0002] Generator carbon brushes are continuously worn during operation and are consumables. They need to be replaced on average every six months to one year depending on the working conditions. However, for the wear condition of the carbon brushes, currently, it depends on the visual inspection by the inspection personnel. On the one hand, this increases the workload of the inspection personnel. On the other hand, if the inspection personnel do not observe carefully, it is possible to miss the worn carbon brushes.

[0003] In the prior art, a carbon brush on a commutator of a motor includes a housing, a carbon brush slidably disposed in the inner cavity of the housing, and at least one alarm indicator light. One end of the carbon brush is abutted against an elastic element, and the other end of the carbon brush is in contact with the circumferential surface of the commutator. The carbon brush is constantly abutted against the commutator under the action of the elastic element. In order to monitor the wear degree of the carbon brush for timely replacement, a metal wire is embedded in the carbon brush. When the carbon brush wears and slides to a set position, the metal wire is exposed and the alarm indicator light lights up. This technical solution makes the manufacturing process of embedding the metal wire in the carbon brush relatively complex. Another solution is to open a hole at a set position of the carbon brush. A light-emitting element is provided on one side of the carbon brush, and a receiving element is provided on the other side. After the carbon brush wears and moves to the set position, the receiving element can receive the light of the light-emitting element through the hole and the alarm indicator light alarms. However, the hole is extremely easy to be blocked by dust, blocking the light path and causing the alarm to fail.

[0004] Chinese Patent CN100350682C, "Carbon Brush Wear Sensing Device for Motor", a carbon brush wear sensing device for a motor, includes a housing, a carbon brush, an elastic element, and a circuit board device provided with an alarm indicator light. A conductive probe is provided on the circuit board device, and the conductive probe is electrically connected to the alarm indicator light. A contact part is provided on the surface of the carbon brush. The invention utilizes the property that the carbon brush is a conductor, and a contact part is provided on the carbon brush. When the carbon brush wears and needs to be replaced, the alarm indicator light is electrically connected to the carbon brush through the conductive probe, and the alarm indicator light lights up. However, in the long-term operation process of this structure, the conductive probe is relatively loosely installed with the housing, and with a little vibration, the conductive probe will loosen, resulting in the carbon brush being unable to be monitored continuously.

[0005] Chinese Patent CN109983635A, "Carbon Brush Wear Measurement Device". The present invention relates to a carbon brush wear measurement device, which includes: a slip ring (3); a carbon brush (4), which is arranged to be movable along a moving direction (5) and is pre-tightened to be in sliding contact with the slip ring (3); an indicating material (7), which extends along the moving direction (5) in, on, or beside the carbon brush (4) and is connected to the carbon brush (4), such that the indicating material moves together with the carbon brush (4) at least with respect to the moving direction (5), wherein the indicating material (7) is pre-tightened to be in sliding contact with the slip ring (3); an insulator (8), which is arranged between the carbon brush (4) and the indicating material (7) and electrically insulates the carbon brush (4) from the indicating material (7); and a resistance measurement device (9) for measuring the resistance between two measurement points (10, 11; 10, 15), between which there is at least one section of the indicating material (7) and one section of the slip ring (3), wherein the specific resistance of the indicating material (7) is greater than the specific resistance of the carbon brush (4). This structure uses the detection of the resistance of the carbon brush (4) to monitor the length of the carbon brush (4). However, during long-term use, the slip ring (3) will carry a part of the voltage, which will cause the resistance of the carbon brush (4) to show incorrect values. It is necessary to stop the machine and ground it to release the voltage inside the slip ring (3). Therefore, during the use of this device, certain false values will appear, which will affect the judgment of the inspectors. Summary of the Invention

[0006] The main object of the present invention is to provide a carbon brush that automatically alarms when it is too short, and solve the problem that the inspection of the wear of the generator carbon brush is relatively complicated.

[0007] To solve the above technical problems, the technical solution adopted by the present invention is: a carbon brush that automatically alarms when it is too short, including a carbon brush and a brush braid on the carbon brush. The carbon brush is arranged inside a housing. There is a blind hole on the carbon brush, and a carbon rod is arranged inside the blind hole. An insulator is arranged on the outer circumference of the carbon rod. A detection wire is arranged on the carbon rod, and the detection wire is electrically connected to a detection device. The brush braid is electrically connected to the detection device;

[0008] When the carbon brush wears to the position of the carbon rod, the carbon rod forms a circuit through the slip ring, the brush braid and the detection device to give an alarm.

[0009] In a preferred embodiment, the detection device includes a buzzer and an indicator light. The buzzer and the indicator light are connected in series. The indicator light is electrically connected to the carbon brush, and the indicator light is electrically connected to the carbon rod through a power supply.

[0010] In a preferred embodiment, the insulator material is gypsum or ceramic.

[0011] In a preferred embodiment, there is a pressing housing on one side of the housing. There is a pressing piece inside the pressing housing. The pressing piece is slidably connected to the pressing housing. A spring is arranged between the upper part of the pressing piece and the top of the pressing housing.

[0012] In a preferred embodiment, a pressing groove is provided in the middle of the carbon brush, and the pressing piece passes through the pressing housing and is arranged inside the pressing groove.

[0013] In a preferred embodiment, a sliding block is provided inside the pressing housing, and the sliding block is slidably connected to the pressing housing.

[0014] In a preferred embodiment, a through groove is provided in the middle of the sliding block, and the pressing piece passes through the through groove and is arranged inside the carbon brush pressing groove.

[0015] In a preferred embodiment, sliding platforms are provided on both sides of the sliding block, and sliding grooves are provided on both sides inside the pressing housing, and the sliding platforms are arranged inside the sliding grooves.

[0016] In a preferred embodiment, a spring is arranged between the sliding block and the pressing housing.

[0017] In a preferred embodiment, bellows are provided at both ends of the sliding block, and both ends of the bellows are arranged at both ends of the sliding opening of the pressing housing;

[0018] A handle is provided at the end of the pressing piece.

[0019] The present invention provides a carbon brush with automatic alarm for being too short, which can continuously monitor the wear condition of the carbon brush during the use of the generator, generate an electrical signal and give an alarm in time after the carbon brush is worn out, prompt that the carbon brush needs to be replaced immediately. After the carbon brush is worn during use, it can effectively prevent the copper conductive brush braid from directly contacting the surface of the slip ring, the circuit formed by the carbon rod, the carbon brush and the slip ring is connected, and the alarm indicator light is on. When the carbon brush is worn and needs to be replaced, the alarm indicator light is on through the series connection of the carbon rod, the carbon brush and the slip ring. The manufacturing process of the present invention is very simple, the alarm action is reliable, the structure is simple, and it is convenient to use, and it is suitable for popularization and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The following further describes the present invention in conjunction with the drawings and embodiments:

[0021] Figure 1 is the overall structure diagram A of the present invention;

[0022] Figure 2 is the overall structure diagram B of the present invention;

[0023] Figure 3 is the electrical connection structure diagram of the carbon brush and the detection device of the present invention;

[0024] Figure 4 is the side view cross-sectional structure diagram of the carbon brush of the present invention;

[0025] Figure 5 is the structure diagram of the carbon brush worn to the detection position of the present invention;

[0026] Figure 6 is the installation structure diagram of the brush grinding and the housing of the present invention;

[0027] Figure 7 This is a main structural diagram of the brush grinding and housing installation of the present invention;

[0028] Figure 8 This is a side sectional structural diagram of the housing of the present invention;

[0029] Figure 9 This is a transverse cross-sectional structural diagram of the housing of the present invention;

[0030] In the figure: housing 1; pressing shell 2; slide groove 201; carbon brush 3; pressing groove 301; carbon rod 302; insulator 303; brush braid 4; phoenix sounder 5; indicator light 6; detection line 7; pressing plate 8; handle 801; accordion cover 9; power supply 10; sliding block 11; through groove 1101; slide table 1102; spring 12; slip ring 13; detection device 14. DETAILED DESCRIPTION

[0031] like Figures 1 to 9 As shown, a carbon brush with automatic alarm for being too short includes a carbon brush 3 and a brush braid 4 on the carbon brush 3. The carbon brush 3 is arranged inside the housing 1. A blind hole is provided on the carbon brush 3. A carbon rod 302 is provided inside the blind hole. An insulator 303 is provided around the outer periphery of the carbon rod 302. A detection line 7 is provided on the carbon rod 302. The detection line 7 is electrically connected to the detection device 14. The brush braid 4 is electrically connected to the detection device 14. When the carbon brush 3 wears to the position of the carbon rod 302, the carbon rod 302 forms a circuit through the slip ring 13, the brush braid 4 and the detection device 14 to generate an alarm. With this structure, as shown in FIG. Figures 1 - 5 In the structure, the detection device 14 forms a series circuit with the carbon rod 302, the carbon brush 3 and the slip ring 13. At this time, the detection device 14 alarms and the entire carbon brush 3 needs to be replaced. The structure is simple and easy to use.

[0032] In the preferred embodiment, the detection device 14 includes a sounding device 5 and an indicator light 6, which are connected in series. The indicator light 6 is electrically connected to the carbon brush 3, and the indicator light 6 is electrically connected to the carbon rod 302 through the power supply 10. Figure 5 In the structure shown, the buzzer 5 and the indicator light 6 are electrically connected in series. The buzzer 5 is electrically connected to the carbon brush 3 through the brush braid 4, and the indicator light 6 is electrically connected to the power supply 10 through the resistor and the diode. The power supply 10 is electrically connected to the carbon rod 302. Since an insulator 303 is provided between the carbon rod 302 and the carbon brush 3, the circuit will not form a loop and no alarm will occur. When the carbon rod 302 contacts the slip ring 13, the entire structure will form a loop, the buzzer 5 and the indicator light 6 will light up, and the carbon brush 3 will be replaced.

[0033] The sounder 5 and the indicator light 6 can also be connected in parallel.

[0034] In a preferred embodiment, the material of the insulator 303 is gypsum or ceramic. With this structure, after gypsum and ceramic are hardened, they have a hardness similar to that of the carbon brush 3 and will not cause wear to the slip ring 13. The material used can be replaced according to the usage situation.

[0035] In a preferred embodiment, a pressing shell 2 is provided on one side of the housing 1. A pressing piece 8 is provided inside the pressing shell 2. The pressing piece 8 is slidably connected to the pressing shell 2. A spring 12 is provided between the upper part of the pressing piece 8 and the top of the pressing shell 2. With this structure, as Figures 6 - 8 shown in the structure, the pressing piece 8 is provided on one side of the housing 1 and can be pulled out or moved up and down along the pressing shell 2 by the spring 12 to press the carbon brush 3. The torsion spring structure is relatively complex when replacing the carbon brush 3, and this structure is more convenient for replacing the carbon brush 3.

[0036] In a preferred embodiment, a pressing groove 301 is provided in the middle of the carbon brush 3. The pressing piece 8 passes through the pressing shell 2 and is provided inside the pressing groove 301. With this structure, the pressing groove 301 is used to place the pressing piece 8 to prevent the pressing piece 8 from sliding on the carbon brush 3 and causing unstable pressing.

[0037] In a preferred embodiment, a sliding block 11 is provided inside the pressing shell 2. The sliding block 11 is slidably connected to the pressing shell 2. With this structure, the sliding block 11 plays a role in sliding with the pressing shell 2, and the pressing piece 8 and the sliding block 11 play a role in sliding.

[0038] In a preferred embodiment, a through groove 1101 is provided in the middle of the sliding block 11. The pressing piece 8 passes through the through groove 1101 and is provided inside the pressing groove 301 of the carbon brush 3. With this structure, the pressing piece 8 and the sliding block 11 play a role in sliding.

[0039] In a preferred embodiment, sliding platforms 1102 are provided on both sides of the sliding block 11. Chute grooves 201 are provided on both sides inside the pressing shell 2. The sliding platforms 1102 are provided inside the chute grooves 201. With this structure, the sliding block 11 can always be kept stable without deviation.

[0040] In a preferred embodiment, the spring 12 is provided between the sliding block 11 and the pressing shell 2. With this structure, the spring 12 is used to abut against the upper end surface of the sliding block 11 to drive the sliding block 11 to press downwards.

[0041] In a preferred embodiment, bellows covers 9 are provided at both ends of the sliding block 11. Both ends of the bellows covers 9 are provided at both ends of the sliding openings of the pressing shell 2. With this structure, the bellows covers 9 play a role in dust prevention.

[0042] A handle 801 is provided at the end of the pressing piece 8. With this structure, the handle 801 is used to pull out the pressing piece 8 and then lift the pressing piece 8 and place it on the pressing groove 301 of the new carbon brush 3.

[0043] The above embodiments are only the preferred technical solutions of the present invention and should not be regarded as limitations on the present invention. The protection scope of the present invention shall be the technical solutions recorded in the claims, including the equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, the equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A carbon brush with automatic alarm for being too short, characterized in that: It includes a carbon brush (3) and a brush pigtail (4) on the carbon brush (3). The carbon brush (3) is arranged inside the housing (1). A blind hole is provided on the carbon brush (3), a carbon rod (302) is arranged inside the blind hole, an insulator (303) is arranged on the outer circumference of the carbon rod (302), a detection wire (7) is arranged on the carbon rod (302), the detection wire (7) is electrically connected to a detection device (14), and the brush pigtail (4) is electrically connected to the detection device (14). When the carbon brush (3) wears to the position of the carbon rod (302), the carbon rod (302) forms a loop through the slip ring (13), the brush pigtail (4) and the detection device (14) to give an alarm. A pressing housing (2) is provided on one side of the housing (1). A pressing piece (8) is arranged inside the pressing housing (2). The pressing piece (8) is slidably connected to the pressing housing (2). A spring (12) is arranged between the upper part of the pressing piece (8) and the top of the pressing housing (2). A pressing groove (301) is provided in the middle of the carbon brush (3). The pressing piece (8) passes through the pressing housing (2) and is arranged inside the pressing groove (301). A sliding block (11) is arranged inside the pressing housing (2). The sliding block (11) is slidably connected to the pressing housing (2).

2. The carbon brush with automatic alarm for being too short according to claim 1, characterized in that: The detection device (14) includes a buzzer (5) and an indicator light (6). The buzzer (5) and the indicator light (6) are connected in series. The indicator light (6) is electrically connected to the carbon brush (3), and the indicator light (6) is electrically connected to the carbon rod (302) through a power supply (10).

3. The carbon brush with automatic alarm for being too short according to claim 1, characterized in that: The material of the insulator (303) is gypsum or ceramic.

4. The carbon brush with automatic short alarm according to claim 1, characterized in that: A through groove (1101) is provided in the middle of the sliding block (11). The pressing piece (8) passes through the through groove (1101) and is arranged inside the pressing groove (301) of the carbon brush (3).

5. The carbon brush with automatic short - circuit alarm according to claim 4, characterized in that: Sliding platforms (1102) are provided on both sides of the sliding block (11). Chute grooves (201) are provided on both sides inside the pressing housing (2). The sliding platforms (1102) are arranged inside the chute grooves (201).

6. The carbon brush with automatic short-length alarm according to claim 5, characterized in that: The spring (12) is arranged between the sliding block (11) and the pressing housing (2).

7. The carbon brush with automatic short - length alarm according to claim 4, characterized in that: Bellows covers (9) are provided at both ends of the sliding block (11). Both ends of the bellows covers (9) are arranged at both ends of the sliding openings of the pressing housing (2). A handle (801) is provided at the end of the pressing piece (8).

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