Full-automatic lifting device for three-phase winding asynchronous motor carbon brush

Abstract

The utility model discloses a full-automatic lifting device for a carbon brush of a three-phase winding asynchronous motor. The full-automatic lifting device comprises a speed reducer, a slip ring system protection box, a lifting driving motor, a rotor junction box, a rotor junction box support, a cam induction mechanism, a carbon brush assembly, a motor slip ring and a carbon brush assembly fixing bearing, the speed reducer is connected with the lifting drive motor and fixed to the top of the slip ring system protection box, and the rotor junction box is connected with the slip ring system protection box through the rotor junction box support. The cam sensing mechanism and the carbon brush assembly are arranged in the slip ring system protection box; the cam induction mechanism is connected with the short circuit ring system and the carbon brush assembly. The carbon brush assembly surrounds the outer side of the motor slip ring, and positioning and swinging are achieved by fixing the bearing through the carbon brush assembly. The mechanism is reasonable in structure, easy to maintain and convenient to operate, prolongs the service life of the carbon brush and the collector ring, improves the reliability of the three-phase winding asynchronous motor, and reduces the maintenance frequency and cost of the motor.

Description

Technical Field

[0001] The utility model relates to the technical field of asynchronous motors, in particular to a fully automatic carbon brush lifting device for a three-phase winding asynchronous motor. Background Art

[0002] When starting a three-phase wound asynchronous motor, connecting the wound rotor to an external water resistance system can modify the motor's starting characteristic curve, increasing starting torque and reducing starting current. This system is particularly suitable for applications with heavy starting loads and low starting capacity. Existing three-phase wound asynchronous motors have complex slip ring systems, requiring high alignment requirements. Mechanical limit sensors are currently used, which are prone to malfunction. These issues severely impact the service life of the motor's slip ring system and carbon brushes, while also increasing the motor's failure rate.

[0003] Based on the above reasons, it is necessary to improve the current problems of short service life of the slip ring system and carbon brushes during starting of the three-phase wound asynchronous motor and high motor failure rate. Utility Model Content

[0004] In view of the problems existing in the above-mentioned prior art, the utility model provides a fully automatic lifting device for carbon brushes of a three-phase wound asynchronous motor, thereby solving the above-mentioned technical problems.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a three-phase winding asynchronous motor carbon brush fully automatic lifting device, including a reducer, a slip ring system protection box, a lifting drive motor, a rotor terminal box, a rotor terminal box bracket and a cam sensing mechanism, a carbon brush assembly, a motor slip ring, and a carbon brush assembly fixed bearing;

[0006] The reducer is connected to the lifting drive motor and fixed to the top of the slip ring system protection box, and the rotor terminal box is connected to the slip ring system protection box through the rotor terminal box bracket;

[0007] The cam sensing mechanism and the carbon brush assembly are arranged in the slip ring system protection box; the cam sensing mechanism is connected to the short-circuit ring system and the carbon brush assembly respectively; the carbon brush assembly is surrounded by the outside of the motor slip ring, and the positioning and swing are achieved by fixing the bearing through the carbon brush assembly.

[0008] Furthermore, the cam sensing mechanism includes a cam sensing sensor bracket and a cam sensing sensor; the cam sensing sensor bracket is arranged on the side of the cam; the cam sensing sensor is arranged on the cam sensing sensor bracket; the bottom of the cam is connected to the universal joint connecting rod; the other side of the universal joint connecting rod is connected to the short-circuit ring control bracket; the short-circuit ring system is arranged below the cam.

[0009] Furthermore, the short-circuit ring system includes a short-circuit ring control bracket, a short-circuit ring assembly, a short-circuit ring position sensing sensor and a short-circuit ring position sensor bracket; the short-circuit ring position sensing sensor is installed on the short-circuit ring position sensor bracket; a limiting slot is provided on the short-circuit ring assembly, and the contact and disconnection with the three-phase evenly distributed connecting piece on the motor slip ring is achieved through the short-circuit ring control bracket; three evenly distributed elastic bus bars are fixed to the end face of the short-circuit ring system by bolts, and the straight-line distance L1 between the elastic bus bars is 226 mm.

[0010] Furthermore, the carbon brush assembly includes a bracket fixing main plate, a support rod, a carbon brush member, a carbon brush bracket, an outer fixing plate and a rotating support rod;

[0011] The carbon brush assembly is fixed on the carbon brush bracket; the carbon brush bracket is installed on the support rod; the left and right ends of the support rod are connected to the bracket fixing main plate and the outer fixing plate; the bracket fixing main plate and the outer fixing plate are fixed on the carbon brush assembly fixed bearing by rotating the support rod.

[0012] Furthermore, the motor slip ring is installed on the shaft of the three-phase wound asynchronous motor by shrink fitting; the collector ring on the outer cylindrical surface of the motor slip ring is made of stainless steel 304, with a width W1 of 55 mm and an inner diameter D2 of 120 mm. Three connecting pieces are evenly distributed on the end face of one side of the motor slip ring for contacting and disconnecting with the short-circuit ring system.

[0013] Furthermore, the carbon brush holder is made of a copper plate with good conductivity; after the distance between the multiple carbon brush holders is adjusted, they are positioned by tightening bolts.

[0014] Furthermore, it also includes a slip ring carbon brush assembly position sensor bracket; the slip ring carbon brush assembly position sensor bracket is equipped with a slip ring carbon brush assembly position sensing sensor; the slip ring carbon brush assembly position sensor bracket is arranged on one side of the carbon brush assembly.

[0015] Furthermore, the travel switch of the overall system adopts a photoelectric induction switch.

[0016] The beneficial effects of the utility model are: reasonable structure, easy maintenance, convenient operation, extended service life of carbon brushes and slip rings, improved reliability of three-phase winding asynchronous motors, the travel switches of the entire system all adopt photoelectric induction switches, avoiding the malfunction problem often encountered in conventional touch switches, in addition, the entire slip ring lifting device is connected to the slip ring automatic control cabinet, realizing the one-button start function, reducing the number of maintenance times and costs of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0018] Figure 2 For the utility model Figure 1 Partial cross-sectional structural diagram

[0019] Figure 3 It is a schematic cross-sectional structural diagram of the short-circuit ring system of the present utility model.

[0020] Figure 4 This is a schematic diagram of the external structure of the slip ring system of the present invention.

[0021] Figure 5 This is a schematic diagram of the three-dimensional structure of the carbon brush bracket system of the present invention.

[0022] In the figure: 1. Reducer; 2. Slip ring system protection box; 3. Lifting drive motor; 4. Rotor terminal box; 5. Rotor terminal box bracket; 601. Cam sensing sensor bracket; 602. Cam sensing sensor; 603. Cam; 604. Universal joint connecting rod; 605. Short-circuit ring control bracket; 606. Short-circuit ring assembly; 607. Short-circuit ring position sensing sensor; 608. Short-circuit ring position sensor bracket; 609. Slip ring carbon brush assembly position sensor bracket; 610. Slip ring carbon brush assembly position sensing sensor; 7. Carbon brush assembly; 701. Bracket fixing main plate; 702. Support rod; 703. Carbon brush assembly; 704. Carbon brush bracket; 705. Outer fixing plate; 706. Rotating support rod; 8. Motor slip ring; 9. Carbon brush assembly fixing bearing. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are only used to illustrate the present invention and are not intended to limit the scope of the present invention.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention pertains. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0025] like Figure 1-Figure 5 As shown, a three-phase winding asynchronous motor carbon brush fully automatic lifting device includes a reducer 1, a slip ring system protection box 2, a lifting drive motor 3, a rotor terminal box 4, a rotor terminal box bracket 5, a cam sensing mechanism, a carbon brush assembly 7, a motor slip ring 8, and a carbon brush assembly fixed bearing 9;

[0026] The reducer 1 is connected to the lifting drive motor 3 and fixed on the top of the slip ring system protection box 2. The rotor terminal box 4 is connected to the slip ring system protection box 2 through the rotor terminal box bracket 5;

[0027] The cam sensing mechanism and the carbon brush assembly 7 are arranged in the slip ring system protection box 2; the cam sensing mechanism is connected to the short-circuit ring system and the carbon brush assembly 7 respectively; the carbon brush assembly 7 is surrounded by the outside of the motor slip ring 8, and the carbon brush assembly fixes the bearing 9 to achieve positioning and swing.

[0028] In this embodiment, the cam sensing mechanism preferably includes a cam sensing sensor bracket 601 and a cam sensing sensor 602; the cam sensing sensor bracket 601 is arranged on the side of the cam 603; the cam sensing sensor 602 is arranged on the cam sensing sensor bracket 601; the bottom of the cam 603 is connected to the universal joint link 604; the other side of the universal joint link 604 is connected to the short-circuit ring control bracket 605; the short-circuit ring system is arranged below the cam 603.

[0029] Preferably, in this embodiment, the short-circuit ring system includes a short-circuit ring control bracket 605, a short-circuit ring assembly 606, a short-circuit ring position sensing sensor 607 and a short-circuit ring position sensor bracket 608; the short-circuit ring position sensing sensor 607 is installed on the short-circuit ring position sensor bracket 608; a limiting groove is provided on the short-circuit ring assembly 606, and contact and disconnection with the three-phase evenly distributed connecting piece on the motor slip ring 8 is achieved through the short-circuit ring control bracket 605; three evenly distributed elastic mother plug-ins are fixed to the end face of the short-circuit ring system by bolts, and the straight-line distance L1 between the elastic mother plug-ins is 226 mm.

[0030] In this embodiment, the carbon brush assembly 7 preferably includes a bracket fixing main plate 701, a support rod 702, a carbon brush member 703, a carbon brush bracket 704, an outer fixing plate 705 and a rotating support rod 706;

[0031] The carbon brush assembly 703 is fixed on the carbon brush bracket 704; the carbon brush bracket 704 is installed on the support rod 702; the left and right ends of the support rod 702 are connected to the bracket fixing main plate 701 and the outer fixing plate 705; the bracket fixing main plate 701 and the outer fixing plate 705 are fixed to the carbon brush assembly fixed bearing 9 through the rotating support rod 706.

[0032] In this embodiment, the motor slip ring 8 is preferably installed on the shaft of the three-phase wound asynchronous motor by shrink fitting; the collector ring on the outer surface of the motor slip ring 8 is made of stainless steel 304, with a width W1 of 55 mm and an inner diameter D2 of 120 mm. Three connecting pieces are evenly distributed on one end surface of the motor slip ring 8 for contacting and disconnecting with the short-circuit ring system.

[0033] In this embodiment, the carbon brush holder 704 is preferably made of a copper plate with good conductivity. After the distance between the plurality of carbon brush holders 704 is adjusted, they are positioned by tightening bolts.

[0034] Preferably, this embodiment further includes a slip ring carbon brush assembly position sensor bracket 609; the slip ring carbon brush assembly position sensor bracket 609 is equipped with a slip ring carbon brush assembly position sensing sensor 610; the slip ring carbon brush assembly position sensor bracket 609 is arranged on one side of the carbon brush assembly 7.

[0035] In this embodiment, preferably, the travel switch of the overall system adopts a photoelectric sensor switch.

[0036] Working principle: The method of using the present invention comprises the following steps:

[0037] A. Before the three-phase winding asynchronous motor starts, the lifting drive motor in the automatic lifting system operates through the reduction mechanism and the cam universal connecting rod transmission system. When the cam operates, the short-circuit ring system and the slip ring system are separated. At this time, the short-circuit ring position sensor 607 transmits a position signal;

[0038] B. Simultaneously push the fixed main plate 701 of the carbon brush assembly 7 to bring the carbon brush member 703 into contact with the collector ring on the slip ring system. At this time, the position sensor 610 of the slip ring carbon brush assembly transmits a position signal.

[0039] C. After the above actions are completed, the cam sensor 602 transmits a position signal, the lifting drive motor stops, the slip ring system is connected to the external water resistance system, and the three-phase winding asynchronous motor is powered on and started;

[0040] D. When the three-phase winding asynchronous motor reaches the rated speed, the lifting drive motor is energized and runs in the reverse direction. The short-circuit ring system and the motor slip ring are connected through the cam universal connecting rod transmission system, and the carbon brushes are separated from the collector ring. After that, the three-phase winding asynchronous motor operates under the rated state.

[0041] In summary, the present invention has a reasonable structure, is easy to maintain, and is convenient to operate. It extends the service life of carbon brushes and slip rings, and improves the reliability of three-phase wound asynchronous motors. The travel switches of the entire system all adopt photoelectric induction switches, which avoids the malfunction problem often encountered in conventional touch switches. In addition, the entire slip ring lifting device is connected to the slip ring automatic control cabinet, realizing the one-button start function, and reducing the number of maintenance times and costs of the motor.

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements or improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A fully automatic lifting device for carbon brushes of a three-phase winding asynchronous motor, characterized in that: It includes a speed reducer (1), a slip ring system protection box (2), a lifting drive motor (3), a rotor terminal box (4), a rotor terminal box bracket (5), a cam sensing mechanism, a carbon brush assembly (7), a motor slip ring (8), and a carbon brush assembly fixed bearing (9); The reducer (1) is connected to the lifting drive motor (3) and fixed to the top of the slip ring system protection box (2); the rotor terminal box (4) is connected to the slip ring system protection box (2) via a rotor terminal box bracket (5); The cam sensing mechanism and the carbon brush assembly (7) are arranged in the slip ring system protection box (2); the cam sensing mechanism is connected to the short-circuit ring system and the carbon brush assembly (7) respectively; the carbon brush assembly (7) is surrounded by the outside of the motor slip ring (8), and the carbon brush assembly fixes the bearing (9) to achieve positioning and swinging.

2. The fully automatic lifting device for carbon brushes of a three-phase wound asynchronous motor according to claim 1 is characterized in that: The cam sensing mechanism comprises a cam sensing sensor bracket (601) and a cam sensing sensor (602); the cam sensing sensor bracket (601) is arranged on the side of the cam (603); the cam sensing sensor (602) is arranged on the cam sensing sensor bracket (601); the lower part of the cam (603) is connected to the universal joint connecting rod (604); the other side of the universal joint connecting rod (604) is connected to the short-circuit ring control bracket (605); and the short-circuit ring system is arranged below the cam (603).

3. The fully automatic lifting device for carbon brushes of a three-phase wound asynchronous motor according to claim 1 is characterized in that: The short-circuit ring system comprises a short-circuit ring control bracket (605), a short-circuit ring assembly (606), a short-circuit ring position sensing sensor (607) and a short-circuit ring position sensor bracket (608); the short-circuit ring position sensing sensor (607) is mounted on the short-circuit ring position sensor bracket (608); a limiting groove is provided on the short-circuit ring assembly (606), and contact and disconnection with the three-phase uniformly distributed connecting piece on the motor slip ring (8) are achieved through the short-circuit ring control bracket (605); three uniformly distributed elastic female plug-ins are fixed to the end face of the short-circuit ring system by bolts, and the straight-line distance L1 between the elastic female plug-ins is 226 mm.

4. The fully automatic lifting device for carbon brushes of a three-phase wound asynchronous motor according to claim 1 is characterized in that: The carbon brush assembly (7) comprises a bracket fixing main plate (701), a support rod (702), a carbon brush member (703), a carbon brush bracket (704), an outer fixing plate (705), and a rotating support rod (706); The carbon brush member (703) is fixed on the carbon brush bracket (704); the carbon brush bracket (704) is mounted on the support rod (702); the left and right ends of the support rod (702) are connected to the bracket fixing main plate (701) and the outer fixing plate (705); the bracket fixing main plate (701) and the outer fixing plate (705) are fixed to the carbon brush assembly fixed bearing (9) through the rotating support rod (706).

5. The fully automatic lifting device for carbon brushes of a three-phase wound asynchronous motor according to claim 1 is characterized in that: The motor slip ring (8) is mounted on the shaft of the three-phase wound asynchronous motor by shrink sleeve; the collector ring on the outer cylindrical surface of the motor slip ring (8) is made of stainless steel 304, with a width W1 of 55 mm and an inner diameter D2 of 120 mm. Three connecting pieces are evenly distributed on one end surface of the motor slip ring (8) for contacting and disconnecting with the short-circuit ring system.

6. The fully automatic lifting device for carbon brushes of a three-phase wound asynchronous motor according to claim 4 is characterized in that: The carbon brush holder (704) is made of a copper plate with good electrical conductivity; after the distance between the plurality of carbon brush holders (704) is adjusted, they are positioned by means of locking bolts.

7. The fully automatic lifting device for carbon brushes of a three-phase wound asynchronous motor according to claim 1 is characterized in that: It also includes a slip ring carbon brush assembly position sensor bracket (609); a slip ring carbon brush assembly position sensor (610) is mounted on the slip ring carbon brush assembly position sensor bracket (609); and the slip ring carbon brush assembly position sensor bracket (609) is arranged on one side of the carbon brush assembly (7).

8. The fully automatic lifting device for carbon brushes of a three-phase wound asynchronous motor according to claim 1 is characterized in that: The travel switch of the whole system adopts photoelectric induction switch.

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