A brushless motor and rotary spray gun for plasma surface treatment

Abstract

The utility model relates to a brushless motor and a rotary spray gun for plasma surface treatment. The brushless motor for plasma surface treatment comprises a housing, a stator fixedly mounted in the housing, a hollow rotor placed in the stator, and end covers respectively arranged at the front and rear ends of the stator; the end covers are arranged at the front and rear ends of the hollow rotor through bearing sleeves, an insulating bearing sleeve is arranged between the end cover and the bearing, and at least one conductive component is also included, one end of the conductive component is connected to the hollow rotor, and the other end is connected to the housing or any of the end covers. The utility model insulates the bearing and the end cover by adding an insulating bearing sleeve between the bearing and the end cover of the brushless motor for plasma surface treatment, and also establishes a conductive path between the ground wire and the hollow rotor through the conductive component, thereby avoiding the influence of frequent conductive operation of the bearing during use on the coking of lubricating grease, and prolonging the service life of the motor.

Description

Technical Field

[0001] The utility model relates to the technical field of brushless motors, in particular to a brushless motor and a rotary spray gun for plasma surface treatment. Background Art

[0002] The traditional plasma surface treatment rotary spray gun generally uses a brushed motor or a brushless motor as the driving wheel, and then drives the rotary spray gun to rotate through a belt. This structure leads to a complex overall structure, a large volume, low transmission efficiency, long-term high-speed rotation will cause high operating noise, the transmission belt is easy to slip or break, the failure rate is high, the heat is high, and the service life is short. For this reason, a brushless motor for plasma surface treatment has been developed. The output shaft of this motor is a hollow shaft; the hollow shaft of the motor is directly used to drive the plasma gun head to rotate, which can reduce the transmission link loss compared to the previous contact transmission such as synchronous belts or gears, and has a simple structure, fewer parts and low cost.

[0003] However, since the rotation of the spray gun requires the use of bearing transmission, during use, the current continuously passes through the bearing to reach the hollow shaft, and then cooperates with the high-voltage wire in the hollow body to discharge and ionize the air. However, since the lubricating grease in the bearing is a poor conductor of electricity, during the continuous power-on and discharge process, the high-voltage electricity breaks through the grease to produce sparks, causing the grease to heat up, denature, and even dry up and coke. Ultimately, the grease cannot play a lubricating role. As time goes by, it will damage the bearing or the bearing will get stuck. Therefore, it is necessary to make further improvements. Utility Model Content

[0004] The purpose of the utility model is to overcome the above shortcomings and defects, and to provide a brushless motor and a rotary spray gun for plasma surface treatment.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] A brushless motor for plasma surface treatment comprises a housing, a stator fixedly mounted in the housing, a hollow rotor disposed in the stator, and end covers respectively disposed at the front and rear ends of the stator; the end covers are disposed at the front and rear ends of the hollow rotor through bearing sleeves, an insulating bearing sleeve is disposed between the end covers and the bearings, and at least one conductive component is further included, one end of the conductive component is connected to the hollow rotor, and the other end is connected to the housing or any of the end covers.

[0007] The utility model provides an insulating bearing sleeve between the bearing and the end cover of the brushless motor for plasma surface treatment to insulate the bearing and the end cover, and also establishes a conductive path between the ground wire and the hollow rotor through a conductive component, thereby avoiding the influence of frequent conductive operation of the bearing during use on the coking of lubricating grease and prolonging the service life of the motor.

[0008] Preferably, the carbon brush assembly may be a built-in conductive assembly or an external conductive assembly, wherein the built-in conductive assembly is a assembly fixedly mounted on the front cover or the rear cover and placed inside the housing, and the external conductive assembly is fixedly mounted on the housing.

[0009] Preferably, the conductive component is a carbon brush component, which has good conductivity, good corrosion resistance, and wear resistance, is more suitable for high temperature and humid environments, and is cost-effective.

[0010] Preferably, the carbon brush assembly includes a carbon brush box with an opening at one end and a carbon brush slidably installed in the carbon brush box, the carbon brush has an abutment end exposed from the carbon brush box, the abutment end abuts against the hollow rotor, and the carbon brush box is connected to the shell or any one of the end covers.

[0011] Preferably, the carbon brush assembly further comprises a spring, which is installed in the carbon brush box, with one end abutting against the side wall of the carbon brush box and the other end connected to the carbon brush. By providing the spring, the carbon brush can be reset better and is more suitable for an environment with high-speed rotation and vibration.

[0012] Preferably, a conductive ring is provided at a position corresponding to the abutting end of the hollow rotor and the conductive component.

[0013] Preferably, the motor further comprises a controller, which is a built-in controller or an external controller. The built-in controller is located in the housing and is integrated with the motor body. The external controller is located separately from the motor body.

[0014] Preferably, a protective cover is further provided on the end cover, and the bearing and the insulating bearing sleeve are located inside the protective cover to prevent falling objects or carbon powder from falling on the bearing during use, thereby playing a dust-proof role.

[0015] The utility model also provides a rotary spray gun, comprising the above-mentioned brushless motor for plasma surface treatment.

[0016] Preferably, the rotary spray gun also includes a spray gun head, an electrical tube, and a power cord; the spray gun head is connected to the front end of the hollow rotor, an electrode is provided inside the spray gun head, and the electrical tube is sleeved and fixed inside the hollow rotor; the power cord includes a high-voltage wire and a ground wire, the high-voltage wire is provided inside the electrical tube and connected to the electrode; the ground wire is connected to the electrical tube.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] The utility model proposes a brushless motor for plasma surface treatment, which changes the traditional front and rear end covers and ground connection paths, and takes a different approach, adding an insulating bearing sleeve between the bearing and the end cover of the brushless motor for plasma surface treatment, insulating the bearing and the front end cover, and establishing a conductive path between the front end cover and the hollow rotor through a conductive component, thereby avoiding the influence of frequent conductive conduction of the bearing during use and extending the service life of the motor. The motor can be used for a rotary spray gun for plasma surface treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structure of a brushless motor for plasma surface treatment according to an embodiment of the utility model;

[0020] Figure 2 It is a partial structural schematic diagram of a brushless motor for plasma surface treatment according to an embodiment of the utility model;

[0021] Figure 3 This is a schematic diagram of the three-dimensional structure of a rotary spray gun according to an embodiment of the utility model;

[0022] Figure 4 This is a schematic diagram of the cross-sectional structure of a rotary spray gun according to an embodiment of the utility model. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the invention more clear, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] Combination Figure 1-2 The utility model provides a brushless motor for plasma surface treatment, including a housing, a stator 8 fixedly mounted in the housing, a hollow rotor 6 placed in the stator, and end covers 9 respectively arranged at the front and rear ends of the stator; the end covers 9 are sleeved on the front and rear ends of the hollow rotor 6 through bearings 7, an insulating bearing sleeve 4 is provided between the end covers 9 and the bearings 7, and also includes at least one conductive component 100, one end of the conductive component 100 is connected to the hollow rotor 6, and the other end is connected to the housing or any end cover 9.

[0025] The conductive component 100 can be a built-in conductive component or an external conductive component. The built-in conductive component is a component fixed on the front cover or the rear cover and placed inside the shell, while the external conductive component is fixed on the shell.

[0026] The conductive component 100 can be any conductive component, such as a metal conductive component, as long as a path can be established between the ground wire and the hollow rotor, and the discharge current finally passes through the conductive component and reaches the ground wire, ensuring safety in use. Preferably, it is a carbon brush component, which has good conductivity, good corrosion resistance, wear resistance, is more suitable for high temperature and humid environment, and has high cost performance.

[0027] The number of the conductive components 100 may be one or more, preferably two, which are symmetrically arranged on both sides of the hollow rotor 6.

[0028] The conductive component 100 can be disposed on both the front and rear end covers, or disposed on one of the end covers alone, or disposed on the housing alone.

[0029] Combined with Figure 1 , a schematic diagram of the structure of a conductive component 100 as a built-in carbon brush component is given, grooves are provided in the front and rear end covers 9, the bearing 7 is located in the groove, the bearing 7 includes a ball 10 and lubricating grease 11, the insulating bearing sleeve 4 is provided on the outer periphery of the bearing 7 and is located in the groove, the conductive component 100 is provided on the front end cover, one end is abutted against the hollow rotor 6, and the other end is connected to the front end cover. Moreover, there are two conductive components 100, which are symmetrically arranged on both sides of the hollow rotor 6. In this way, the bearing 7 and the front end cover 9 are insulated. During the use of the motor, no current will pass through the bearing 7 to reach the front end cover, thereby avoiding ionization and corrosion of the lubricating grease in the bearing.

[0030] The conductive component 100 is a carbon brush component, including a carbon brush box 101 with an opening at one end, a carbon brush 102 slidably installed in the carbon brush box, and the carbon brush 102 has an abutting end exposed from the carbon brush box, and the abutting end abuts against the hollow rotor 6. The carbon brush box 101 is connected to the front end cover. During the rotation of the hollow rotor 6, the current can reach the ground wire through the carbon brush. The carbon brush is slidably installed to facilitate better contact with the hollow rotor.

[0031] In one embodiment, the carbon brush assembly further includes a spring 103, which is installed in the carbon brush box 101, with one end abutting against the side wall of the carbon brush box and the other end connected to the carbon brush 102. By providing the spring, the carbon brush can be better reset and is more suitable for high-speed rotation and vibration environments.

[0032] The carbon brush assembly may also be arranged on the rear end cover, or the carbon brush box may be fixed on the housing, and the carbon brush 102 has an abutting end exposed from the carbon brush box and abuts against the hollow rotor 6 .

[0033] In one embodiment, a conductive ring 2 is provided at a position corresponding to the abutting end of the hollow rotor 6 and the carbon brush 102 .

[0034] In one of the embodiments, a protective cover 3 is provided on both the front and rear end covers 9, and the bearing 7 and the insulating bearing sleeve 4 are located in the space formed by the protective cover 3 and the end cover 9, so as to prevent carbon powder generated during the friction of the carbon brush assembly from falling on the bearing, thereby playing a dust-proof role.

[0035] In addition, the motor of the present invention further includes a controller 12, which can be a built-in controller or an external controller. The built-in controller is the controller 12 located in the housing and is integrated with the motor body. Figure 1 , the controller 12 is encapsulated in the housing at the rear of the rear cover. The external controller, that is, the controller and the motor body are separated. Those skilled in the art can choose different settings according to actual needs.

[0036] Reference Figure 3-4 The utility model also provides a rotary spray gun, including the above-mentioned brushless motor for plasma surface treatment.

[0037] Furthermore, it also includes a spray gun head 17, an electrical tube 5, and a power cord; the spray gun head 17 is connected to the front end of the hollow rotor 6, and an electrode 15 is provided inside the hollow rotor 6. The electrical tube 5 is sleeved and fixed inside the hollow rotor 6, providing a current channel on the one hand and an air channel on the other hand; the power cord includes a high-voltage line 13 and a ground line 14, the high-voltage line 13 is provided inside the electrical tube 5 and connected to the electrode 15; the ground line 14 is connected to the electrical tube 5.

[0038] The utility model provides an insulating bearing sleeve between the bearing and the end cover of the brushless motor for plasma surface treatment to insulate the bearing and the end cover, and also establishes a conductive path between the ground wire and the hollow rotor through a conductive component, thereby avoiding the influence of frequent conductive conduction of the bearing during use and causing the lubricating grease to coke, thereby extending the service life of the motor. The utility model can be applied to a rotary spray gun to increase its service life.

[0039] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0040] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A brushless motor for plasma surface treatment, characterized in that: It comprises a housing, a stator (8) fixedly mounted in the housing, a hollow rotor (6) disposed in the stator (8), and end covers (9) respectively disposed at the front and rear ends of the stator (8); The end cover (9) is sleeved on the front and rear ends of the hollow rotor (6) via bearings (7), and an insulating bearing sleeve (4) is provided between the end cover (9) and the bearing (7). It also comprises at least one conductive component (100), one end of the conductive component (100) being in communication with the hollow rotor (6), and the other end of the conductive component (100) being in communication with the housing or any one of the end covers (9).

2. The brushless motor for plasma surface treatment according to claim 1, characterized in that: The conductive component is a built-in conductive component or an external conductive component. The built-in conductive component is located inside the shell and is fixed on any one of the end covers (9); the external conductive component is fixed on the shell.

3. The brushless motor for plasma surface treatment according to claim 2, characterized in that: The conductive component (100) is a carbon brush component.

4. The brushless motor for plasma surface treatment according to claim 3, characterized in that: The carbon brush assembly comprises a carbon brush box (101) with an opening at one end, and a carbon brush (102) slidably mounted in the carbon brush box, the carbon brush (102) having an abutment end exposed from the carbon brush box, the abutment end abutting against the hollow rotor (6), and the carbon brush box (101) being in communication with the housing or any one of the end covers (9).

5. The brushless motor for plasma surface treatment according to claim 4, characterized in that: The carbon brush assembly also includes a spring (103), which is installed in the carbon brush box (101), with one end of the spring abutting against the side wall of the carbon brush box (101) and the other end connected to the carbon brush (102).

6. The brushless motor for plasma surface treatment according to claim 1, characterized in that: A conductive ring (2) is provided at a position corresponding to the abutting end of the hollow rotor (6) and the conductive component (100).

7. The brushless motor for plasma surface treatment according to claim 1, characterized in that: It also includes a controller (12), wherein the controller (12) is a built-in controller or an external controller.

8. The brushless motor for plasma surface treatment according to claim 1, characterized in that: A protective cover (3) is also provided on the end cover (9), and the bearing (7) and the insulating bearing sleeve (4) are located in a space enclosed by the protective cover (3) and the end cover (9).

9. A rotary spray gun, characterized in that: It comprises a brushless motor for plasma surface treatment as described in any one of claims 1 to 8.

10. The rotary spray gun according to claim 9, characterized in that: Also includes a spray gun head (17), an electrical tube (5), and a power cord; The spray gun head (17) is connected to the front end of the hollow rotor (6), and an electrode (15) is provided inside the spray gun head. The electrical tube (5) is sleeved and fixed inside the hollow rotor (6); The power line comprises a high-voltage line (13) and a ground line (14); the high-voltage line is arranged inside the electrical tube (5) and connected to the electrode (15); the ground line (14) is connected to the electrical tube (5).

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