Carbon brush grinding device of synchronous motor

Abstract

The utility model relates to a carbon brush grinding device of a synchronous motor, and belongs to the technical field of motor maintenance. Comprising a control mechanism and a grinding mechanism; in the grinding mechanism, one side of a T-shaped base is connected with an adjustable-speed motor support and an adjustable-speed motor, the other side of the T-shaped base is connected with a grinding slip ring support, the grinding slip ring support is connected with a bearing seat and bearings, a center shaft is installed on the two bearings, the adjustable-speed motor is connected with the center shaft through a coupler, the center shaft is connected with a grinding slip ring, and a carbon brush holder fixing plate support is connected with a carbon brush holder fixing plate. The carbon brush holder fixing plate is connected with a plurality of carbon brush holders, and carbon brushes to be ground are fixed on the carbon brush holders through carbon brush pressure springs; and a PLC (Programmable Logic Controller) in the control mechanism is electrically connected with the speed regulating motor and the operation display screen. By arranging the control mechanism and the grinding mechanism, the device for controlling the grinding mechanism to automatically grind the carbon brush through the control mechanism is provided, and the grinding precision is ensured. And a plurality of carbon brush holders are arranged, so that a plurality of carbon brushes can be longitudinally ground at the same time in one grinding process, and the grinding efficiency of the carbon brushes is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of motor maintenance, in particular to a carbon brush grinding device for a synchronous motor. Background Art

[0002] During the operation of a synchronous motor, the carbon brush is an important power transmission component, and its working state directly affects the performance and safety of the synchronous motor. However, due to wear and consumption during use, the carbon brush needs to be replaced and ground regularly to ensure good contact with the slip ring. The existing carbon brush grinding methods are mainly manual and electric.

[0003] By analyzing the traditional carbon brush grinding method, the following problems are found:

[0004] 1. The traditional carbon brush grinding method mainly relies on manual operation by maintenance personnel. The grinding amount of the carbon brush cannot be set by time, resulting in poor accuracy and easy excessive wear of the carbon brush, shortening its service life.

[0005] 2. The traditional carbon brush grinding device cannot grind multiple carbon brushes simultaneously. Horizontally fixing the carbon brush on the grinding device results in vibration of the carbon brush during the grinding process, reducing the grinding efficiency.

[0006] 3. As an important indicator for evaluating the contact quality between the carbon brush and the collector ring, the traditional grinding device has the disadvantage of being unable to detect the contact resistance, and it cannot be detected under simulated working conditions.

[0007] 4. The carbon brush powder generated during the grinding process escapes and cannot be collected, causing pollution to the grinding working environment. Summary of the Invention

[0008] To solve the above technical problems, the utility model provides a carbon brush grinding device for a synchronous motor. The technical solution of the utility model is as follows:

[0009] A carbon brush grinding device for a synchronous motor, which comprises a control mechanism and a grinding mechanism;

[0010] The grinding mechanism includes a T-shaped base. On one side of the horizontal part of the T-shaped base, a speed-regulating motor bracket is fixedly connected. On the top of the speed-regulating motor bracket, a speed-regulating motor is fixedly connected. On the other side of the horizontal part of the T-shaped base, two symmetrically arranged grinding slip ring brackets are fixedly connected. On the top of each grinding slip ring bracket, a bearing seat is fixedly connected. A bearing is installed inside the bearing seat. A central shaft is installed on the two bearings. The inner ring of the bearing is in interference fit with the central shaft. One end of the output shaft of the speed-regulating motor is connected to one end of a coupling, and the other end of the coupling is connected to one end of the central shaft. The other end of the central shaft extends out from the right grinding slip ring bracket. A grinding slip ring is fixedly connected to the central shaft between the two bearings. The diameter of the grinding slip ring is the same as the outer diameter of the slip ring of the synchronous motor. On the vertical part of the T-shaped base, a carbon brush holder fixing plate bracket is fixedly connected. On the top of the carbon brush holder fixing plate bracket, a carbon brush holder fixing plate is fixedly connected. Several carbon brush holders are fixedly connected to the carbon brush holder fixing plate. The carbon brush to be ground is fixed on the carbon brush holder by a carbon brush compression spring;

[0011] The control mechanism includes a control cabinet, a PLC, and an operation display screen. The operation display screen is installed on the control cabinet, and the PLC is installed inside the control cabinet. The PLC is electrically connected to both the speed-regulating motor and the operation display screen.

[0012] Optionally, the carbon brush grinding device of the synchronous motor further includes a dust collection mechanism. The dust collection mechanism includes a dust collection hood. The inlet of the dust collection hood is aligned with the carbon brush holder fixing plate. The outlet of the dust collection hood is connected to one end of a dust collection pipe, and the other end of the dust collection pipe is connected to a dust collection body. A suction fan is installed on the top of the dust collection body. The PLC is electrically connected to the suction fan.

[0013] Optionally, the carbon brush grinding device of the synchronous motor further includes a resistance detection mechanism. The resistance detection mechanism includes an insulating plate, several contact electrode positive test insulators, a contact electrode negative test insulator, and a contact resistance tester. Several contact electrode positive test insulators are fixedly connected to the side of the carbon brush holder fixing plate away from the carbon brush holder. The connecting wires of several carbon brushes to be ground are electrically connected to several contact electrode positive test insulators one by one. A contact electrode negative test insulator and a negative carbon brush holder are fixedly connected to the right grinding slip ring bracket. A test carbon brush is fixed in the negative carbon brush holder by a carbon brush compression spring. The connecting wire of the test carbon brush is electrically connected to the contact electrode negative test insulator. The insulating plate is installed between the carbon brush holder and the carbon brush holder fixing plate, and the contact resistance tester is installed in the control cabinet;

[0014] The control mechanism further includes a solid-state relay and a frequency converter. The PLC is electrically connected to the solid-state relay. The positive terminal of the contact resistance tester is electrically connected to several contact electrode positive test insulators through the solid-state relay, and the negative terminal of the contact resistance tester is electrically connected to the contact electrode negative test insulator. The PLC is electrically connected to the speed-regulating motor through the frequency converter.

[0015] Optionally, the carbon brush holder fixing plate has the same radian as the grinding slip ring, and the carbon brush holder fixing plate is installed parallel above the grinding slip ring.

[0016] Optionally, a filter cartridge is detachably connected inside the dust collection body, and the part of the exhaust fan extending into the dust collection body is located inside the filter cartridge.

[0017] Optionally, the top of the carbon brush holder fixing plate bracket is fixedly connected to the carbon brush holder fixing plate through a carbon brush holder fixing plate connecting bolt.

[0018] Optionally, a plurality of carbon brush holders are fixedly connected to the carbon brush holder fixing plate through carbon brush holder fixing bolts.

[0019] Optionally, a plurality of carbon brush holders are concentrically arranged, and the distances between the plurality of carbon brush holders and the grinding slip ring are equal.

[0020] All of the above optional technical solutions can be arbitrarily combined, and the present utility model does not elaborate on the structures after combined one by one.

[0021] By means of the above solutions, the beneficial effects of the present utility model are as follows:

[0022] By providing a control mechanism and a grinding mechanism, a device for automatically grinding carbon brushes by controlling the grinding mechanism through the control mechanism is provided. The grinding time and grinding speed can be flexibly set through the control mechanism, so as to accurately control the grinding amount, ensure the grinding accuracy, and avoid shortening the service life of the carbon brushes due to excessive grinding. By providing that the grinding mechanism includes a plurality of carbon brush holders, and the carbon brushes to be ground are fixed on the carbon brush holders through carbon brush compression springs, a plurality of carbon brushes can be longitudinally ground simultaneously in one grinding process, which can not only avoid the vibration of the carbon brushes during the grinding process and affect the grinding effect, but also improve the grinding efficiency of the carbon brushes.

[0023] By providing a resistance detection mechanism and cooperating with the operation of the control mechanism, the contact resistance of the carbon brushes can be detected under simulated working conditions. By providing a dust collection mechanism, the carbon brush powder generated during the grinding process can be collected in time to avoid the pollution of the grinding working environment caused by the carbon brush powder.

[0024] The above description is only an overview of the technical solutions of the present utility model. In order to be able to understand the technical means of the present utility model more clearly and implement them in accordance with the content of the description, the following takes the preferred embodiments of the present utility model and combines with the attached drawings to describe in detail as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is the front view of the present utility model.

[0026] Figure 2 is the top view of the grinding mechanism in the present utility model.

[0027] Figure 3 It is a schematic diagram of the connection relationship between the carbon brush holder fixing plate bracket and the grinding slip ring in the present utility model.

[0028] Figure 4 It is a schematic diagram of the connection relationship between the carbon brush to be ground and the carbon brush holder in the present utility model.

[0029] The reference numerals are: 1 - T-shaped base, 2 - speed regulating motor bracket, 3 - carbon brush holder fixing plate bracket, 4 - grinding slip ring bracket, 5 - speed regulating motor, 6 - coupling, 7 - bearing seat, 8 - central shaft, 9 - grinding slip ring, 10 - carbon brush holder fixing plate, 11 - carbon brush holder fixing bolt, 12 - operation display screen, 13 - insulating plate, 14 - carbon brush holder fixing bolt, 15 - carbon brush to be ground, 16 - carbon brush compression spring, 17 - carbon brush holder, 18 - connecting wire, 19 - contact electrode positive test insulator, 20 - contact electrode negative test insulator, 21 - negative carbon brush holder, 22 - dust collection hood, 23 - dust collection pipe, 24 - dust collection body, 25 - exhaust fan, 26 - filter cartridge, 27 - control cabinet. Specific embodiments

[0030] The following will further describe in detail the specific embodiments of the present utility model in conjunction with the drawings and embodiments. The following embodiments are used to illustrate the present utility model, but are not used to limit the scope of the present utility model.

[0031] As Figures 1 to 4 shown, the carbon brush grinding device of the synchronous motor provided by the embodiment of the present utility model includes a control mechanism and a grinding mechanism;

[0032] The grinding mechanism includes a T-shaped base 1. One side of the horizontal part of the T-shaped base 1 is welded with a speed regulating motor bracket 2. The top of the speed regulating motor bracket 2 is fixedly connected with a speed regulating motor 5 by screws. The other side of the horizontal part of the T-shaped base 1 is welded with two symmetrically arranged grinding slip ring brackets 4. The top of each grinding slip ring bracket 4 is welded with a bearing seat 7. A bearing is installed inside the bearing seat 7. A central shaft 8 is installed on the two sets of bearings. The inner ring of the bearing is in interference fit with the central shaft 8. One end of the output shaft of the speed regulating motor 5 is inserted into one end of the coupling 6. The other end of the coupling 6 is inserted into one end of the central shaft 8. The other end of the central shaft 8 extends out from the right grinding slip ring bracket 4. A grinding slip ring 9 is welded on the central shaft 8 between the two sets of bearings. The diameter of the grinding slip ring 9 is the same as the outer diameter of the slip ring of the synchronous motor. The vertical part of the T-shaped base 1 is welded with a carbon brush holder fixing plate bracket 3. The top of the carbon brush holder fixing plate bracket 3 is fixedly connected with a carbon brush holder fixing plate 10. A plurality of carbon brush holders 17 are longitudinally fixedly connected to the carbon brush holder fixing plate 10. The carbon brush to be ground 15 is fixed on the carbon brush holder 17 by a carbon brush compression spring 16;

[0033] The control mechanism includes a control cabinet 27, a PLC, and an operation display screen 12. The operation display screen 12 is installed on the control cabinet 27, and the PLC is installed inside the control cabinet 27. The PLC is electrically connected to both the speed-regulating motor 5 and the operation display screen 12.

[0034] Specifically, the axes of the two bearings coincide with the axis of the grinding slip ring 9. The grinding slip ring 9 is rotatably connected to the two bearings by a central shaft 8 to realize the rotation of the grinding slip ring 9. The bearings used are 6204 bearings. The inner ring of the bearing is sleeved with the central shaft 8 and is in interference fit.

[0035] When the carbon brush grinding device of the synchronous motor provided in this embodiment is working, first place the carbon brush 15 to be ground into the carbon brush holder 17. After the surface to be ground of the carbon brush 15 to be ground contacts the grinding slip ring 9, fix the carbon brush 15 to be ground through the carbon brush compression spring 16. Then, after the staff sets parameters such as the carbon brush grinding amount, grinding time, and grinding speed on the operation display screen 12 according to the grinding requirements, start the grinding. Next, the PLC controls the speed-regulating motor 5 to rotate. The rotation of the speed-regulating motor 5 drives the coupling 6, the central shaft 8, and the grinding slip ring 9 to rotate synchronously, thereby realizing the grinding of the carbon brush 15 to be ground. After the system runs, it starts timing. When the set grinding time is reached, the grinding process stops. After grinding, a spare carbon brush with the same arc as the carbon brush to be replaced is obtained. The utility model can realize the automatic control of the carbon brush grinding process of the synchronous motor, and through the calculation of the grinding amount, set the grinding time and grinding speed to achieve precise grinding of the carbon brush, solve the problem that excessive wear of the carbon brush caused by grinding shortens its service life, and provide better guarantee for the safe and stable operation of the synchronous motor.

[0036] The carbon brush grinding device of the synchronous motor provided in this embodiment can also install several carbon brushes 15 to be ground at the same time. This embodiment adopts a method of fixing the carbon brush according to the actual application scenario of the carbon brush. Multiple carbon brushes 15 to be ground can be fixed separately longitudinally, which can reduce the vibration generated during the grinding process, improve the grinding efficiency and the grinding qualification rate. The carbon brush 15 to be ground is fixed by a carbon brush compression spring 16 to ensure good contact between the contact surface of the carbon brush 15 to be ground and the grinding slip ring 9.

[0037] In another embodiment, the carbon brush grinding device of the synchronous motor further includes a dust collection mechanism. The dust collection mechanism includes a dust collection hood 22. The inlet of the dust collection hood 22 is aligned with the carbon brush holder fixing plate 10. One end of the dust collection pipe 23 is connected to the outlet of the dust collection hood 22, and the other end of the dust collection pipe 23 is connected to a dust collection body 24. A suction fan 25 is installed on the top of the dust collection body 24. The PLC is electrically connected to the suction fan 25.

[0038] Based on the above embodiments, the carbon brush grinding device of the synchronous motor provided in this embodiment also has a dust collection function. Specifically, during the start-up or grinding process, the operator starts the dust collection function on the operation display screen 12. At this time, the PLC controls the exhaust fan 25 to start running. The carbon brush powder generated by grinding passes through the dust collection cover 22 and the dust collection pipe 23, and is sucked into the dust collection body 24 by the exhaust fan 25, realizing the function of collecting carbon brush powder and solving the problem of environmental pollution of the grinding work caused by carbon brush powder.

[0039] Further, a filter cartridge 26 is detachably connected inside the dust collection body 24, and the part of the exhaust fan 25 extending into the dust collection body 24 is located inside the filter cartridge 26. The filter cartridge 26 functions to filter the carbon brush powder entering the dust collection body 24, blocking the carbon brush powder entering the dust collection body 24 in the gap between the filter cartridge 26 and the dust collection body 24, preventing the carbon brush powder from entering the filter cartridge 26 and affecting the operation of the exhaust fan 25, and the filtered air is discharged through the exhaust fan 25.

[0040] Further, the start-up of the exhaust fan 25 is interlocked with the grinding, starting and stopping synchronously to ensure the environmental protection of the working environment and the safety of personnel.

[0041] Further, the dust collection cover 22 is made of plastic material, which is convenient for disassembly and assembly.

[0042] In another embodiment, the carbon brush grinding device of the synchronous motor further includes a resistance detection mechanism. The resistance detection mechanism includes an insulating plate 13, a plurality of contact electrode positive test insulators 19, contact electrode negative test insulators 20, and a contact resistance tester. The plurality of contact electrode positive test insulators 19 are fixedly connected to the side of the carbon brush holder fixing plate 10 away from the carbon brush holder 17. The connecting wires 18 of the plurality of carbon brushes 15 to be ground are respectively connected to the plurality of contact electrode positive test insulators 19 by wires. A contact electrode negative test insulator 20 and a horizontally placed negative carbon brush holder 21 are fixedly connected to the grinding slip ring bracket 4 on the right side. A test carbon brush is fixed in the negative carbon brush holder 21 by a carbon brush compression spring 16, and the connecting wire 18 of the test carbon brush is electrically connected to the contact electrode negative test insulator 20. The insulating plate 13 is installed between the carbon brush holder 17 and the carbon brush holder fixing plate 10. The contact resistance tester and the solid-state relay are both installed in the control cabinet 27. The control mechanism further includes a solid-state relay and a frequency converter. The PLC is electrically connected to the solid-state relay. The positive terminal of the contact resistance tester is connected to the plurality of contact electrode positive test insulators 19 by wires through the solid-state relay, and the negative terminal of the contact resistance tester is connected to the contact electrode negative test insulator 20 by wires. The PLC is electrically connected to the speed control motor 5 through the frequency converter.

[0043] On the basis of the above embodiments, the carbon brush grinding device of the synchronous motor provided in this embodiment also has the function of detecting the contact resistance of the ground carbon brushes. Specifically, after the carbon brush 15 to be ground is ground, connect the positive terminal of the contact resistance detector to the wire of the solid state relay, and connect the solid state relay to the positive test insulators 19 of several contact electrodes respectively by wires. Connect the negative terminal of the contact resistance detector to the negative test insulator 20 of the contact electrode by wire. After the wiring is completed, the operator sets the operating speed of the carbon brush in the operation display screen 12 and then starts the detection. At this time, the frequency converter accelerates the speed control motor 5 to the set operating speed mode according to the set speed. After reaching the set operating speed, the PLC controls the contact resistance tester and the solid state relay to detect the contact resistance of several ground carbon brushes in turn. The contact resistance tester transmits the detection data to the PLC respectively, and the operation display screen 12 displays the detection data. In summary, this embodiment realizes the detection of the contact resistance under simulated working conditions. When detecting the contact resistance, the insulating plate 13 insulates the carbon brush holder 17, the carbon brush 15 and the carbon brush holder fixing plate 10.

[0044] In another embodiment, the arc of the carbon brush holder fixing plate 10 is the same as that of the grinding slip ring 9, and the carbon brush holder fixing plate 10 is installed parallel to the upper part of the grinding slip ring 9. Several carbon brush holders 17 are concentrically arranged, and the distances between several carbon brush holders 17 and the grinding slip ring 9 are equal. With such a setting, when several carbon brushes 15 to be ground are ground, the same grinding effect can be achieved.

[0045] In a specific embodiment, the top of the carbon brush holder fixing plate bracket 3 is fixedly connected to the carbon brush holder fixing plate 10 through the carbon brush holder fixing plate connection bolt 11.

[0046] In a specific embodiment, five carbon brush holders 17 are fixedly connected to the carbon brush holder fixing plate 10 through the carbon brush holder fixing bolts 14. The insulating plate 13 is installed between the carbon brush holder 17 and the carbon brush holder fixing plate 10 through the carbon brush holder fixing bolts 14. The carbon brush holder fixing bolts 14 can be insulating bolts.

[0047] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A carbon brush grinding device for a synchronous motor, characterized in that, It includes a control mechanism and a grinding mechanism; The grinding mechanism includes a T-shaped base (1). On one side of the horizontal part of the T-shaped base (1), a speed-regulating motor bracket (2) is fixedly connected. On the top of the speed-regulating motor bracket (2), a speed-regulating motor (5) is fixedly connected. On the other side of the horizontal part of the T-shaped base (1), two symmetrically arranged grinding slip ring brackets (4) are fixedly connected. On the top of each grinding slip ring bracket (4), a bearing seat (7) is fixedly connected. A bearing is installed inside the bearing seat (7). A central shaft (8) is installed on the two bearings. The inner ring of the bearing is in interference fit with the central shaft (8). One end of the output shaft of the speed-regulating motor (5) is connected to one end of a coupling (6). The other end of the coupling (6) is connected to one end of the central shaft (8). The other end of the central shaft (8) extends out from the right grinding slip ring bracket (4). A grinding slip ring (9) is fixedly connected to the central shaft (8) between the two bearings. The diameter of the grinding slip ring (9) is the same as the outer diameter of the slip ring of the synchronous motor. The vertical part of the T-shaped base (1) is fixedly connected with a carbon brush holder fixing plate bracket (3). On the top of the carbon brush holder fixing plate bracket (3), a carbon brush holder fixing plate (10) is fixedly connected. A number of carbon brush holders (17) are fixedly connected to the carbon brush holder fixing plate (10). The carbon brush to be ground (15) is fixed on the carbon brush holder (17) through a carbon brush compression spring (16); The control mechanism includes a control cabinet (27), a PLC, and an operation display screen (12). The operation display screen (12) is installed on the control cabinet (27). The PLC is installed inside the control cabinet (27). The PLC is electrically connected to both the speed-regulating motor (5) and the operation display screen (12).

2. The carbon brush grinding device for a synchronous motor according to claim 1, characterized in that, It also includes a dust collection mechanism. The dust collection mechanism includes a dust collection hood (22). The inlet of the dust collection hood (22) is aligned with the carbon brush holder fixing plate (10). The outlet of the dust collection hood (22) is connected to one end of a dust collection pipe (23). The other end of the dust collection pipe (23) is connected to a dust collection body (24). A suction fan (25) is installed on the top of the dust collection body (24). The PLC is electrically connected to the suction fan (25).

3. The carbon brush grinding device for a synchronous motor according to claim 1 or 2, characterized in that, It also includes a resistance detection mechanism. The resistance detection mechanism includes an insulating plate (13), a number of contact electrode positive test insulators (19), a contact electrode negative test insulator (20), and a contact resistance tester. A number of contact electrode positive test insulators (19) are fixedly connected to the side of the carbon brush holder fixing plate (10) away from the carbon brush holder (17). The connecting wires (18) of a number of carbon brushes to be ground (15) are electrically connected to a number of contact electrode positive test insulators (19) one by one. A contact electrode negative test insulator (20) and a negative carbon brush holder (21) are fixedly connected to the right grinding slip ring bracket (4). A test carbon brush is fixed in the negative carbon brush holder (21) through a carbon brush compression spring (16). The connecting wire (18) of the test carbon brush is electrically connected to the contact electrode negative test insulator (20). The insulating plate (13) is installed between the carbon brush holder (17) and the carbon brush holder fixing plate (10). The contact resistance tester is installed in the control cabinet (27); The control mechanism further includes a solid-state relay and a frequency converter. The PLC is electrically connected to the solid-state relay. The positive terminal of the contact resistance tester is electrically connected to the positive contact electrodes of several test insulators (19) through the solid-state relay, and the negative terminal of the contact resistance tester is electrically connected to the negative contact electrodes of the test insulators (20). The PLC is electrically connected to the speed-regulating motor (5) through the frequency converter.

4. The carbon brush grinding device for a synchronous motor according to claim 1, characterized in that, The carbon brush holder fixing plate (10) has the same curvature as the grinding slip ring (9), and the carbon brush holder fixing plate (10) is installed parallel to the upper part of the grinding slip ring (9).

5. The carbon brush grinding device for a synchronous motor according to claim 2, characterized in that, A filter cartridge (26) is detachably connected inside the dust collection body (24), and the part of the exhaust fan (25) extending into the dust collection body (24) is located inside the filter cartridge (26).

6. The carbon brush grinding device for a synchronous motor according to claim 1, characterized in that, The top of the carbon brush holder fixing plate bracket (3) is fixedly connected to the carbon brush holder fixing plate (10) through a carbon brush holder fixing plate connecting bolt (11).

7. The carbon brush grinding device for a synchronous motor according to claim 1, characterized in that, Several carbon brush holders (17) are fixedly connected to the carbon brush holder fixing plate (10) through carbon brush holder fixing bolts (14).

8. The carbon brush grinding device for a synchronous motor according to claim 1, characterized in that, Several carbon brush holders (17) are concentrically arranged, and the distances between several carbon brush holders (17) and the grinding slip ring (9) are equal.

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