Protection device for online replacement of carbon brush of synchronous motor

Abstract

The utility model belongs to the technical field of electrical equipment, in particular to a protection device for online replacement of a carbon brush of a synchronous motor, which comprises a protection device main body, and one side of the protection device main body is fixedly connected with an upper clamping plate. When the loss of the carbon brush is larger than a standard value, the protection device body is arranged between an upper support and a lower support of the carbon brush, and the protection device body is used for completely isolating the positive electrode, the negative electrode, the positive electrode brush holder, the negative electrode carbon brush, the motor shell and the like of the secondary slip ring of the synchronous motor. After isolation, an insulation wrench is used for dismounting a carbon brush lead-out wire screw, the carbon brush is taken out from the brush holder and replaced with a new carbon brush, the insulation wrench is used for fixing the carbon brush lead-out wire screw, and the protection device is taken out. The conditions of secondary anode and cathode short circuit and grounding caused by replacement of the secondary slip ring carbon brush of the sintering main extraction synchronous motor during operation of the motor are completely avoided, online replacement of the carbon brush when the secondary slip ring carbon brush is worn is realized, and the overall starting rate of a sintering machine is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to electrical equipment technical field, concretely is a synchronous motor on -line replacement carbon brush's protection device. BACKGROUND

[0002] Sinter main exhaust fan mostly adopts synchronous motor drag, plays the key role in the industrial environment such as sintering plant. The rotor speed of synchronous motor is same with the speed of stator rotating magnetic field, which makes it have constant speed characteristic when running. In sinter main exhaust fan, this constant speed characteristic ensures the stable operation of fan, thereby improves the efficiency of entire sintering process;Secondly, the power factor of synchronous motor can be improved by adjusting excitation current. In sintering plant, main exhaust fan usually needs to consume a large amount of electric energy, and this characteristic of synchronous motor helps to reduce the loss of reactive power and improve the power factor of power grid. This not only can reduce the electric energy consumption, but also can reduce the negative influence on power grid;

[0003] But the secondary slip ring of synchronous motor rotor has carbon brush, and the carbon brush plays a crucial role in synchronous motor. As a kind of sliding contact, carbon brush is responsible for transmitting energy or signal between slip ring and fixed part, ensuring that the motor can run normally. Carbon brush is usually made of pure carbon plus solidifying agent, and its shape is generally square, and it is firmly clamped on the metal support. When the motor rotates, the carbon brush is tightly pressed on the slip ring by the internal spring, ensuring stable contact. When the motor works, electric energy is transmitted to the slip ring through the carbon brush, and then energy transmission and signal transmission are realized. Since the main component of carbon brush is carbon, it has a certain wearability. In order to ensure the stable operation of motor, carbon brush needs to be replaced regularly and carbon deposition needs to be cleaned. But the conventional operation of replacing carbon brush can only be carried out when the machine is stopped, which affects normal production, so we propose a synchronous motor on-line replacement carbon brush protection device to solve the above problems. CONTENT OF UTILITY MODEL

[0004] (I) technical problem solved

[0005] In view of the deficiency of prior art, the utility model provides a synchronous motor on-line replacement carbon brush protection device, which solves the problems proposed in the above background technology.

[0006] (II) technical scheme

[0007] The utility model discloses in order to realize the above-mentioned purpose specifically adopts the following technical scheme:

[0008] The utility model provides a synchronous motor's on -line replacement carbon brush's protection device, including protection device main part, one side of protection device main part is connected with the upper clamping board fixedly, is equipped with the upper clamping groove on the upper clamping board, the other side of protection device main part is connected with the lower clamping board fixedly, is equipped with the lower clamping groove on the lower clamping board, be equipped with carbon brush contact layer on protection device main part, the upper surface of carbon brush contact layer is equipped with structure support layer, the upper surface of structure support layer is equipped with insulating outer layer.

[0009] Further, the carbon brush contact layer is made of copper alloy material.

[0010] Further, the structure support layer is made of phenolic laminated paper board material.

[0011] Further, the insulating outer layer is made of epoxy resin material.

[0012] Further, the structure support layer is internally provided with a honeycomb structure.

[0013] (Three) beneficial effects

[0014] Compared with the prior art, the utility model provides a synchronous motor's on -line replacement carbon brush's protection device, has the following beneficial effects:

[0015] The utility model discloses a synchronous motor's on -line replacement carbon brush's protection device, including protection device main part, one side of protection device main part is connected with the upper clamping board fixedly, is equipped with the upper clamping groove on the upper clamping board, the other side of protection device main part is connected with the lower clamping board fixedly, is equipped with the lower clamping groove on the lower clamping board, be equipped with carbon brush contact layer on protection device main part, the upper surface of carbon brush contact layer is equipped with structure support layer, the upper surface of structure support layer is equipped with insulating outer layer. BRIEF DESCRIPTION OF DRAWINGS

[0016] Fig. 1 It is the three -dimensional structure schematic diagram of the utility model;

[0017] Fig. 2 It is the protection device main part cross section structure schematic diagram of the utility model.

[0018] In the diagram: 1. Main body of the protection device; 2. Upper locking plate; 3. Upper locking groove; 4. Lower locking plate; 5. Lower locking groove; 6. Carbon brush contact layer; 7. Structural support layer; 8. Insulating outer layer. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Example

[0021] like Figs. 1-2 As shown in the figure, an embodiment of this utility model discloses a protection device for online carbon brush replacement of a synchronous motor. The device includes a main body 1, an upper locking plate 2 fixedly connected to one side of the main body 1, with an upper locking groove 3 on the upper locking plate 2, and a lower locking plate 4 fixedly connected to the other side of the main body 1, with a lower locking groove 5 on the lower locking plate 4. A carbon brush contact layer 6 is provided on the main body 1, with a structural support layer 7 on the upper surface of the carbon brush contact layer 6 and an insulating outer layer 8 on the upper surface of the structural support layer 7. When the carbon brush wear is found to be greater than the standard value, and there is no downtime for replacement, the upper locking groove 3 and lower locking groove 5 on the upper locking plate 2 and lower locking plate 4 engage and fix with the motor bracket, thus ensuring the protection device is secure. The main body 1 of the protection device is placed between the upper and lower supports of the carbon brush, ensuring that the main body 1 of the protection device is securely installed on the motor. Using the main body 1 of the protection device, the positive and negative poles of the secondary slip ring of the synchronous motor, the positive and negative brush holders, the positive and negative carbon brushes, and the motor housing are completely isolated. After isolation, the lead screw of the carbon brush to be replaced is removed with an insulated wrench, the carbon brush is taken out from the brush holder, and a new carbon brush is replaced. The lead screw of the carbon brush is then fixed with an insulated wrench. After the above operations are completed, the protection device is removed. This completely avoids the situation of secondary positive and negative short circuits and grounding that may occur when the carbon brush of the secondary slip ring of the sintering main synchronous motor is replaced while the motor is running. It realizes online replacement of carbon brushes when the secondary slip ring carbon brushes are worn, thus improving the overall operating rate of the sintering machine.

[0022] In some embodiments, the carbon brush contact layer 6 is made of copper alloy material. Copper alloy is a high-quality conductive material with better conductivity than most metals. In the carbon brush contact layer 6, the excellent conductivity can ensure the stable transmission of current between the carbon brush and the motor rotor, reduce energy loss and resistance heating effect, and reduce energy consumption and temperature rise. Copper alloy has high strength and wear resistance.

[0023] In some embodiments, the structural support layer 7 is made of phenolic laminated paper board material, which is the key part of the protection device body 1 to provide stability and support, and it ensures that the protection device body 1 can be firmly installed on the bracket of the motor and maintain a stable structure during the replacement of the carbon brush, and can withstand the vibration and impact during the operation of the motor, while providing sufficient strength and rigidity to ensure the overall performance of the protection device body 1.

[0024] In some embodiments, the insulating outer layer 8 is made of epoxy resin material, which has good insulation performance and can effectively resist the penetration and discharge of high-voltage current, and the main function of the insulating outer layer 8 is to prevent the discharge of current during the replacement of the carbon brush, thereby ensuring the safety of personnel and equipment.

[0025] In some embodiments, the structural support layer 7 is internally provided with a honeycomb structure, which is a highly efficient mechanical structure that can provide excellent strength and stability while ensuring a lighter weight, and this structure can disperse and transfer loads, so that the structural support layer 7 can withstand greater pressure and vibration, thereby ensuring the stability and reliability of the protection device body 1 during the operation of the motor, and the honeycomb structure can make full use of materials and reduce material waste.

[0026] The working principle or structural principle is as follows: when the carbon brush wear is found to be greater than the standard value and there is no downtime for replacement, the upper clamping slot 3 and the lower clamping slot 5 on the upper clamping plate 2 and the lower clamping plate 4 are clamped and fixed with the bracket of the motor, so that the protection device body 1 is placed between the upper and lower brackets of the carbon brush, ensuring that the protection device body 1 is firmly installed on the motor, and the positive and negative poles of the secondary slip ring of the synchronous motor, the positive and negative brush holders, the positive and negative carbon brushes, the motor housing, etc. are completely isolated, after isolation, the carbon brush lead-out screw that needs to be replaced is removed using an insulating wrench, the carbon brush is taken out of the brush holder, and a new carbon brush is replaced, the carbon brush lead-out screw is fixed using an insulating wrench, after the above operation is completed, the protection device is taken out, completely avoiding the secondary positive and negative short circuit and grounding that occurs when the secondary slip ring carbon brush of the sintering main extraction synchronous motor is replaced during the operation of the motor, realizing online replacement of the carbon brush when the secondary slip ring carbon brush is worn, and improving the overall operation rate of the sintering machine.

[0027] Finally, it should be noted that the above description is only a preferred embodiment of the present application and is not intended to limit the present application, although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some technical features. Any modification, equivalent substitution, improvement, etc. made within the spirit and principles of the present application shall be included within the protection scope of the present application.

Claims

1. A protection device for online carbon brush replacement of a synchronous motor, comprising a protection device body (1), characterized in that: An upper locking plate (2) is fixedly connected to one side of the main body (1) of the protection device. An upper locking groove (3) is provided on the upper locking plate (2). A lower locking plate (4) is fixedly connected to the other side of the main body (1) of the protection device. A lower locking groove (5) is provided on the lower locking plate (4). A carbon brush contact layer (6) is provided on the main body (1) of the protection device. A structural support layer (7) is provided on the upper surface of the carbon brush contact layer (6). An insulating outer layer (8) is provided on the upper surface of the structural support layer (7).

2. The protection device for online carbon brush replacement of a synchronous motor according to claim 1, characterized in that: The carbon brush contact layer (6) is made of copper alloy material.

3. The protection device for online carbon brush replacement of a synchronous motor according to claim 1, characterized in that: The structural support layer (7) is made of phenolic laminated paperboard material.

4. The protection device for online carbon brush replacement of a synchronous motor according to claim 1, characterized in that: The insulating outer layer (8) is made of epoxy resin material.

5. The protection device for online carbon brush replacement of a synchronous motor according to claim 3, characterized in that: The internal structure of the structural support layer (7) is designed as a honeycomb structure.

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