A traction motor for coal mining machine with electromagnetic brake

Abstract

This application discloses a traction motor for a coal mining machine with an electromagnetic brake, relating to the field of motor technology. It includes a motor housing, a stator fixed inside the housing, a motor shaft rotatably connected inside the housing, a rotor fixed on the motor shaft, a fixed sleeve fixed outside the housing and to the motor shaft, the motor shaft passing through the fixed sleeve, multiple inner friction rings connected to the motor shaft, an inner connecting key installed between the motor shaft and the inner friction rings, multiple outer friction rings installed on the inner wall of the fixed sleeve, an outer connecting key installed between the inner wall of the fixed sleeve and the outer friction rings, a first wave spring coil installed between adjacent outer friction rings, a sliding sleeve slidably connected to the end of the fixed sleeve away from the motor housing, an end cover fixed to the end of the fixed sleeve away from the motor housing, a DC coil fixed on the end cover, and a compression disc spring installed between the end cover and the sliding sleeve to push the sliding sleeve away from the end cover. This application can shorten the braking response time of the traction motor for a coal mining machine.

Description

Technical Field

[0001] The present application relates to the technical field of motors, and in particular to a traction motor for a coal mining machine with an electromagnetic brake. Background Art

[0002] Coal mining machine is a kind of equipment used for underground coal mining. The slope of its working coal mining face is often between 0°-60°, and its weight is generally between 15-150 tons. The coal mining machine is driven by two traction motors to realize the movement of the coal mining machine. It uses two completely identical braking systems. Therefore, the synchronization coefficient of the two braking systems is greatly affected by the different delays of the hydraulic system, which will cause a single motor to have a large instantaneous current and overload.

[0003] The brakes on traditional coal mining machine motors are hydraulic brakes, and they can only be fully braked after the hydraulic system completely loses pressure (reaches atmospheric pressure). When a traditional coal mining machine starts uphill, it takes a delay of one second for the hydraulic system of the coal mining machine to reach the rated pressure from zero, and it takes a process for the brake to go from the braking state to fully open (i.e., non-braking state). Therefore, the instantaneous uphill start puts a heavy load on the coal mining machine traction motor, and often causes the machine to slide down first and then pull upward, causing great safety hazards in coal mines. Similarly, during the downhill coal mining and traction process of the coal mining machine, when it is necessary to stop traction, since the coal mining machine hydraulic system also needs a delay of several seconds to go from the rated pressure to zero, and it also takes a process for the brake to go from fully braking to fully open (i.e., non-braking state), the coal mining machine needs to slide for several seconds when braking downhill, causing great safety hazards in coal mines. Summary of the invention

[0004] In order to solve the problem of long braking response time of a coal mining machine traction motor, the present application provides a coal mining machine traction motor with an electromagnetic brake.

[0005] The present application provides a traction motor for a coal mining machine with an electromagnetic brake, which adopts the following technical solution:

[0006] A traction motor for a coal mining machine with an electromagnetic brake comprises a motor housing, a stator is fixed in the motor housing, a motor shaft is rotatably connected in the motor housing, a rotor is fixed on the motor shaft at a position corresponding to the stator, both ends of the motor shaft extend out of the motor housing to form a driving end and a braking end respectively, a fixing sleeve is fixed to the outside of the motor housing at the braking end of the motor shaft, the braking end of the motor shaft is penetrated in the fixing sleeve, a plurality of inner friction ring plates are connected to the braking end of the motor shaft, an inner connecting key is installed between the braking end of the motor shaft and the plurality of inner friction ring plates, the inner connecting key is arranged axially along the motor shaft, a plurality of outer friction ring plates are installed on the inner wall of the fixing sleeve, an outer connecting key is installed between the inner wall of the fixing sleeve and the plurality of outer friction ring plates, the outer connecting key is arranged axially along the motor shaft, and the outer friction ring plates and the inner friction ring plates are distributed alternately, A first wave spring ring is installed between adjacent outer friction ring plates, a sliding sleeve for pressing the inner friction ring plate or the outer friction ring plate is slidably connected in the axial direction of the motor shaft in the end of the fixed sleeve away from the motor housing, an end cover is fixed to the end of the fixed sleeve away from the motor housing, a DC coil for adsorbing the sliding sleeve is fixed to the side of the end cover close to the sliding sleeve, and a compression disc spring for pushing the sliding sleeve away from the end cover is installed between the end cover and the sliding sleeve; an insulating sleeve is coaxially fixed to the end cover, a sliding groove is provided at one end of the insulating sleeve close to the sliding sleeve, a conductive sheet is embedded in the inner wall of the sliding groove, a conductive sliding sheet is slidably connected in the sliding groove, an insulating rod is fixed between the conductive sliding sheet and the sliding sleeve, two wires are connected to the DC coil, one of the wires is electrically connected to the conductive sheet, and the conductive sliding sheet is connected to a power supply line.

[0007] By adopting the above technical solution, the compression disc spring is used to push the sliding sleeve to press the outer friction ring and the inner friction ring, thereby achieving braking; by supplying power to the DC coil, the sliding sleeve is adsorbed close to the end cover to release the brake, and the braking response time is extremely short. The DC coil has a 100% working coefficient, which can reach the millisecond level, thereby improving the braking efficiency, reducing the safety hazards in coal mines, improving the reliability of the brake, and improving the synchronization of the dual brakes, making the coal mining machine more stable during operation; the inner friction ring and the outer friction ring are excessively worn and the brake cannot be released, reminding you to check and replace the inner friction ring and the outer friction ring to eliminate safety hazards.

[0008] Preferably, a second wave spring ring is installed between adjacent inner friction ring plates.

[0009] By adopting the above technical solution, the second wave spring ring pushes the inner friction ring plates to separate from each other, thereby preventing the inner friction ring plates from being released from the outer friction ring plates when the brake is released, thereby reducing the rotation resistance of the motor shaft.

[0010] Preferably, a through hole is formed through the end cover, a brake release bolt is connected between the end cover and the sliding sleeve, and a tail of the brake release bolt passes through the through hole and is threadedly connected to the sliding sleeve.

[0011] By adopting the above technical solution, the brake is forcedly released by turning the brake release bolt.

[0012] Preferably, a sliding hole is provided in the insulating sleeve along its axial direction, a scale rod is fixed to the side of the conductive sliding piece away from the sliding sleeve, the scale rod is slidably arranged in the sliding hole, one end of the scale rod away from the conductive sliding piece extends out of the insulating sleeve and has a plurality of scale grooves along its length direction.

[0013] By adopting the above technical solution, if the elastic coefficient of the compression disc spring is reduced and a fixed current is passed through the DC coil, the movement of the sliding sleeve toward the end cover will also increase, thereby causing the length of the scale rod extending out of the insulating sleeve to increase. By reading the scale groove on the scale rod, the fatigue state of the compression disc spring can be understood.

[0014] Preferably, a cylindrical protrusion is fixed to the side of the end cover close to the motor shaft, a sliding groove for slidingly cooperating with the cylindrical protrusion is provided on the sliding sleeve, and the compression disc spring is located in the sliding groove.

[0015] By adopting the above technical solution, the sliding direction of the sliding sleeve is guided.

[0016] Preferably, a first sealing ring is provided between the outer wall of the sliding sleeve and the inner wall of the fixed sleeve, a second sealing ring is provided between the outer wall of the cylindrical protrusion and the inner wall of the sliding groove, and the DC coil is coaxially provided between the first sealing ring and the second sealing ring.

[0017] By adopting the above technical solution, the electromagnetic coil is isolated from the external environment to achieve the purpose of explosion-proof.

[0018] Preferably, a sealing gasket is fixed between the end cover and the fixing sleeve.

[0019] By adopting the above technical solution, the safety protection level is further improved.

[0020] Preferably, a plug-in ring groove for plugging and cooperating with the DC coil is formed on a side surface of the sliding sleeve close to the end cover, and a depth of the plug-in ring groove is greater than a height of the DC coil.

[0021] By adopting the above technical solution, collision between the sliding sleeve and the DC coil can be avoided.

[0022] Preferably, the conductive sheet is in the shape of an elongated strip, is embedded in the inner wall of the slide groove along the depth direction of the slide groove, is a copper sheet, and a push rod is fixed at the bottom of the slide groove near the conductive sheet.

[0023] By adopting the above technical solution, the explosion-proof performance is improved. When the elastic coefficient of the compression disc spring is reduced, the brake is automatically locked to improve safety. In addition, the deformation of the conductive sliding piece is used as a mark, which is conducive to fault detection.

[0024] In summary, the present application includes at least one of the following beneficial technical effects:

[0025] 1. The braking response time is extremely short. The DC coil has a 100% working coefficient, which can reach the millisecond level, which improves the braking efficiency, reduces the potential safety hazards in coal mines, improves the reliability of the brake, and improves the synchronization of the dual brakes, making the coal mining machine more stable during operation;

[0026] 2. High safety protection level, isolating the electromagnetic coil from the external environment to achieve explosion-proof purpose;

[0027] 3. The use scope of the coal mining machine has been expanded. The DC coil is used to adapt to extremely low temperature conditions;

[0028] 4. The inner friction ring and outer friction ring are over-worn and the protection function reminds you to check and replace the inner friction ring and outer friction ring to eliminate potential safety hazards.

[0029] 5. Real-time detection of the fatigue state of the compression disc spring. If the elastic coefficient of the compression disc spring decreases and a fixed current is passed through the DC coil, the movement of the sliding sleeve toward the end cover will increase, which will cause the length of the scale rod extending out of the insulating sleeve to increase. By reading the scale groove on the scale rod, the fatigue state of the compression disc spring can be understood. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the overall structure of a traction motor for a coal mining machine with an electromagnetic brake according to Example 1 of the present application;

[0031] Figure 2 for Figure 1 A partial enlarged view of the middle A part;

[0032] Figure 3 This is a schematic diagram of the overall structure of a traction motor for a coal mining machine with an electromagnetic brake according to Example 2 of the present application;

[0033] Figure 4 for Figure 3 A partial enlarged view of the middle B part;

[0034] Figure 5 This is a partial structural schematic diagram of a traction motor for a coal mining machine with an electromagnetic brake according to Example 3 of the present application;

[0035] 1. The motor housing; 2. The stator; 3. The motor shaft; 4. The rotor; 5. The fixing sleeve; 6. The inner friction ring; 7. The inner connecting key; 8. The outer friction ring; 9. The outer connecting key; 10. The first wave spring ring; 11. The sliding sleeve; 12. The end cover; 13. The DC coil; 14. The compression disc spring; 15. The second wave spring ring; 16. The perforation; 17. The brake release bolt; 18. The insulating sleeve; 19. The slide groove; 20. The conductive sheet; 21. The conductive slide; 22. The insulating rod; 23. The conductor; 24. The power supply line; 25. The sliding hole; 26. The scale rod; 27. The scale groove; 28. The cylindrical protrusion; 29. ​​The sliding groove; 30. The first sealing ring; 31. The second sealing ring; 32. The sealing gasket; 33. The plug-in ring groove; 34. The top poking rod; 51. The middle section sleeve; 52. The end sleeve. DETAILED DESCRIPTION

[0036] The following is combined with Figure 1-Figure 5 This application is described in further detail.

[0037] The embodiment of the present application discloses a traction motor for a coal mining machine with an electromagnetic brake.

[0038] Example 1

[0039] Reference Figure 1 and Figure 2 A traction motor for a coal mining machine with an electromagnetic brake comprises a motor housing 1, a stator 2 is fixed in the motor housing 1, a motor shaft 3 is rotatably connected in the motor housing 1, bearings are installed between both ends of the motor shaft 3 and the motor housing 1 to reduce the resistance to the rotation of the motor shaft 3, a rotor 4 is fixed at a position corresponding to the stator 2 on the motor shaft 3, the rotor 4 is located in the motor housing 1, both ends of the motor shaft 3 extend out of the motor housing 1, and the two ends of the motor shaft 3 respectively form a driving end and a braking end, on the coal mining machine, the driving end of the motor shaft 3 is connected to the coal mining machine actuator to provide power for the actuator, a fixing sleeve 5 is fixed outside the motor housing 1 at the braking end of the motor shaft 3, and an end cover 12 is fixed to the end of the fixing sleeve 5 away from the motor housing 1, the fixing sleeve 5 comprises an end sleeve 52 and an intermediate section sleeve 51 arranged between the end sleeve 52 and the end cover 12, the end cover 12, the intermediate section sleeve 51 and the end sleeve 52 are locked and fixed to one end of the motor housing 1 by a plurality of long bolts, and the braking end of the motor shaft 3 is penetrated into the end sleeve 52.

[0040] Reference Figure 1 and Figure 2, the braking end of the motor shaft 3 is connected with multiple inner friction ring plates 6, and the inner friction ring plates 6 are coaxially installed on the motor shaft 3. The inner diameter of the inner friction ring plates 6 matches the radius of the braking end of the motor shaft 3, and the outer diameter of the inner friction ring plates 6 is smaller than the inner diameter of the end sleeve 52. An inner connecting key 7 is installed between the braking end of the motor shaft 3 and the multiple inner friction ring plates 6. The inner connecting key 7 is an ordinary flat key, and the inner connecting key 7 is arranged along the axial direction of the motor shaft 3. The inner friction ring plates 6 are connected to the braking end of the motor shaft 3 through the inner connecting key 7. The rotation of the motor shaft 3 will synchronously drive the inner friction ring plates 6 to rotate. At the same time, the inner friction ring plates 6 can move relative to the motor shaft 3 in the length direction of the inner connecting key 7.

[0041] Reference Figure 1 and Figure 2 A plurality of external friction ring sheets 8 are coaxially mounted on the inner wall of the end sleeve 52. The outer diameter of the external friction ring sheets 8 matches the inner diameter of the end sleeve 52. The inner diameter of the external friction ring sheets 8 is smaller than the radius of the braking end of the motor shaft 3. An external connecting key 9 is mounted between the inner wall of the end sleeve 52 and the plurality of external friction ring sheets 8. The external connecting key 9 is a common flat key. The external connecting key 9 is axially arranged along the motor shaft 3. The external friction ring sheets 8 do not rotate coaxially and can move relative to the end sleeve 52 along the length direction of the external connecting key 9.

[0042] Reference Figure 1 and Figure 2 The outer friction ring sheets 8 and the inner friction ring sheets 6 are distributed alternately, and a first wave spring ring 10 is installed between adjacent outer friction ring sheets 8. The first wave spring ring 10 is used to push adjacent outer friction ring sheets 8 away from each other. The first wave spring ring 10 is also located between the outer wall of the inner friction ring sheet 6 and the inner wall of the end sleeve 52. The end of the fixed sleeve 5 away from the motor housing 1 is connected with a sliding sleeve 11 for squeezing the inner friction ring sheet 6 or the outer friction ring sheet 8 along the axial sliding direction of the motor shaft 3. The sliding sleeve 11 is located in the middle section sleeve 51. The material of the sliding sleeve 11 is stainless steel. A DC coil 13 for adsorbing the sliding sleeve 11 is fixed on the side of the end cover 12 close to the sliding sleeve 11. A plug-in ring groove 33 for plugging with the DC coil 13 is opened on the side of the sliding sleeve 11 close to the end cover 12. The depth of the plug-in ring groove 33 is greater than the height of the DC coil 13 to avoid collision between the sliding sleeve 11 and the DC coil 13.

[0043] Reference Figure 1 and Figure 2A cylindrical protrusion 28 is integrally fixed to the side of the end cover 12 close to the motor shaft 3. The cylindrical protrusion 28 is coaxially arranged in the DC coil 13. A sliding groove 29 that slides with the cylindrical protrusion 28 is opened on the sliding sleeve 11. A first sealing ring 30 is arranged between the outer wall of the sliding sleeve 11 and the inner wall of the fixed sleeve 5. A second sealing ring 31 is arranged between the outer wall of the cylindrical protrusion 28 and the inner wall of the sliding groove 29. The DC coil 13 is coaxially arranged between the first sealing ring 30 and the second sealing ring 31. A sealing gasket 32 ​​is fixed between the end cover 12 and the fixed sleeve 5. Through the above sealing measures, the electromagnetic coil is isolated from the external environment to achieve the purpose of explosion-proof.

[0044] Reference Figure 1 and Figure 2 A compression disc spring 14 is installed in the sliding groove 29 to push the sliding sleeve 11 away from the end cover 12. The two ends of the compression disc spring 14 are respectively connected to the cylindrical protrusion 28 and the inner wall of the sliding groove 29. A through hole 16 is opened on the end cover 12. A brake release bolt 17 is connected between the end cover 12 and the sliding sleeve 11. The tail of the brake release bolt 17 passes through the through hole 16 and is threadedly connected to the sliding sleeve 11. When the brake needs to be forced to be released, the brake release bolt 17 is tightened to pull the sliding sleeve 11 close to the end cover 12, and the sliding sleeve 11 no longer squeezes the inner friction ring plate 6 or the outer friction ring plate 8, thereby releasing the brake of the motor shaft 3.

[0045] The implementation principle of a traction motor for a coal mining machine with an electromagnetic brake in the embodiment of the present application is as follows: when the DC coil 13 is not energized, the compression disc spring 14 is always in a compressed state. Under the action of the compression disc spring 14, the sliding sleeve 11 squeezes the inner friction ring sheet 6 or the outer friction ring sheet 8, so that multiple inner friction ring sheets 6 and multiple outer friction ring sheets 8 are pressed tightly, and the outer friction ring sheets 8 do not rotate coaxially. The inner friction ring sheets 6 rotate with the motor shaft 3. Under the action of the friction force between the inner friction ring sheets 6 and the outer friction ring sheets 8, the motor shaft is realized. 3's braking; when the DC coil 13 is energized, the safe DC power supply for coal mines is 4 / 6 / 8 / 12 / 16 / 24V. A larger overexcitation current can be selected to power the DC coil 13 according to the working conditions. After the DC coil 13 is powered, a magnetic field is generated to adsorb the sliding sleeve 11, and the sliding sleeve 11 slides toward the end cover 12. The sliding sleeve 11 no longer squeezes the inner friction ring 6 or the outer friction ring 8, and the first wave spring ring 10 pushes the adjacent outer friction rings 8 away from each other, and the motor shaft 3 drives the inner friction ring 6 to rotate coaxially.

[0046] The traction motor for a coal mining machine with an electromagnetic brake in the first embodiment of the present application has at least the following beneficial effects:

[0047] First, the DC coil 13 has a 100% duty cycle, and the braking response time is extremely short, which can reach the millisecond level, thereby improving the braking efficiency, reducing the potential safety hazards in coal mines, improving the reliability of the brake, and improving the synchronization of the dual brakes, making the coal mining machine more stable during operation;

[0048] Second, the electromagnetic coil is isolated from the external environment to achieve the purpose of explosion-proof, making it easy to achieve a high level of protection;

[0049] Thirdly, the DC coil 13 can be used to adapt to extremely low temperature working conditions, thereby expanding the application range of the coal mining machine.

[0050] Example 2

[0051] Reference Figure 3 and Figure 4 A traction motor for a coal mining machine with an electromagnetic brake. The difference between this embodiment and embodiment 1 is that a second wave spring ring 15 is installed between adjacent inner friction ring plates 6. The second wave spring ring 15 is located between the outer wall of the motor shaft 3 and the inner wall of the outer friction ring plate 8. The second wave spring ring 15 is used to push the adjacent inner friction ring plates 6 away from each other. A hole is coaxially penetrated on the end cover 12, and an insulating sleeve 18 is fixed in the hole. A slide groove 19 is opened at one end of the insulating sleeve 18 close to the sliding sleeve 11. A conductive sheet 20 is embedded in the inner wall of the slide groove 19. The conductive sheet 20 is in the shape of a circular sleeve. The conductive sheet 20 is coaxially penetrated with the slide groove 19. The shaft is arranged, the inner diameter of the conductive sheet 20 is the same as the inner diameter of the slide groove 19, a conductive slide 21 is slidably connected in the slide groove 19, an insulating rod 22 is fixed between the conductive slide 21 and the sliding sleeve 11, and the DC coil 13 is connected to two wires 23, and the two wires 23 are respectively used to connect the positive and negative poles of the power supply. In this embodiment, the wire 23 used to connect the negative pole of the power supply is electrically connected to the conductive sheet 20, and the conductive slide 21 is connected to the power supply line 24. One end of the power supply line 24 away from the conductive slide 21 extends out of the insulating sleeve 18. When in use, the wire 23 connected to the positive pole of the power supply is connected to the positive pole of the power supply, and the power supply line 24 is connected to the negative pole of the power supply.

[0052] Reference Figure 3 and Figure 4 A sliding hole 25 is provided in the insulating sleeve 18 along its axial direction, the sliding hole 25 is connected to the sliding groove 19, and is coaxially arranged relative to the sliding groove 19. A scale rod 26 is coaxially fixed to the side of the conductive sliding piece 21 away from the sliding sleeve 11. The scale rod 26 is slidably arranged in the sliding hole 25. One end of the scale rod 26 away from the conductive sliding piece 21 extends out of the insulating sleeve 18, and a plurality of scale grooves 27 are provided along its length direction.

[0053] The traction motor for a coal mining machine with an electromagnetic brake in the second embodiment of the present application has at least the following beneficial effects:

[0054] First, the inner friction ring plate 6 and the outer friction ring plate 8 have an excessive wear reminder protection function; the present application utilizes the inner friction ring plate 6 and the outer friction ring plate 8 to rub against each other to achieve the braking of the motor shaft 3, so after long-term use, the inner friction ring plate 6 and the outer friction ring plate 8 will become thinner and thinner. After a certain degree, the inner friction ring plate 6 and the outer friction ring plate 8 need to be replaced in time; in Example 2 of the present application, when the inner friction ring plate 6 and the outer friction ring plate 8 rub against each other and become thinner to the point where they need to be replaced, the sliding sleeve 11, under the action of the compression disc spring 14, will increase its travel away from the end cover 12, driving the conductive sliding plate 21 to leave the conductive plate 20, and the power supply line 24 cannot be electrically connected to the wire 23 of the negative pole of the power supply through the conductive sliding plate 21 and the conductive plate 20, and the DC coil 13 cannot supply power, reminding the user to replace the inner friction ring plate 6 and the outer friction ring plate 8 in time. The inner friction ring plate 6 and the outer friction ring plate 8 cannot release the brake if they are excessively worn, and potential safety hazards are eliminated in time to improve the safety of coal mining.

[0055] Secondly, the fatigue state detection function of the compression disc spring 14; when a fixed current is passed through the DC coil 13, the adsorption force generated by the DC coil 13 on the sliding sleeve 11 is also fixed. When the compression disc spring 14 is in a normal state, the compression amount of the compression disc spring 14 and the sliding amount of the sliding sleeve 11 are also fixed. However, after long-term use in a special environment, the compression disc spring 14 may become fatigued and the elastic coefficient is reduced. At this time, the force of the compression disc spring 14 on the sliding sleeve 11 may be insufficient, and then the braking force on the motor shaft 3 is insufficient, causing a safety hazard. In Example 2 of the present application, if the elastic coefficient of the compression disc spring 14 is reduced, when in use, a fixed current is passed through the DC coil 13, and the movement of the sliding sleeve 11 toward the end cover 12 will increase, thereby causing the length of the scale rod 26 extending out of the insulating sleeve 18 to increase. By reading the scale groove 27 on the scale rod 26, the fatigue state of the compression disc spring 14 can be understood.

[0056] Example 3

[0057] Reference Figure 5 A traction motor for a coal mining machine with an electromagnetic brake. The difference between this embodiment and embodiment 2 is that the conductive sheet 20 is in the shape of a long strip, and the conductive sheet 20 is embedded in the inner wall of the slide groove 19 along the depth direction of the slide groove 19. The conductive slide 21 uses a 2mm copper sheet. A top poking rod 34 is fixed to the bottom of the slide groove 19 near the conductive sheet 20. When in use, if the elastic coefficient of the compression disc spring 14 decreases, a fixed current is passed through the DC coil 13, and the movement of the sliding sleeve 11 toward the end cover 12 will increase. The conductive slide 21 will hit the top poking rod 34 and be deformed, thereby disconnecting the electrical connection between the conductive sheet 20 and the conductive slide 21. The brake cannot be released even if the DC coil 13 is energized again.

[0058] Embodiment 3 of the present application, a traction motor for a coal mining machine with an electromagnetic brake, has at least the following beneficial effects:

[0059] First, under the premise of achieving the same functions as in Example 2, the electrical connection is isolated from the external environment, further improving the explosion-proof performance and the safety of use;

[0060] Secondly, when the elastic coefficient of the compression disc spring 14 decreases, the brake is automatically locked and cannot be released, which reminds personnel to check and eliminates safety hazards in advance. Compared with embodiment 2, it eliminates the possibility that workers forget to observe the scale groove 27, further improving the safety of equipment use;

[0061] Third, it is convenient for troubleshooting; because the elastic coefficient of the compression disc spring 14 is reduced and the inner friction ring plate 6 and the outer friction ring plate 8 are excessively worn, the brakes cannot be released. When disassembling for inspection, first observe whether the conductive sliding plate 21 is deformed by the top poking rod 34. If so, it is known that the fault is in the compression disc spring 14. If not, the fault is in the inner friction ring plate 6 and the outer friction ring plate 8, thereby improving the inspection efficiency.

[0062] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A traction motor for a coal mining machine with an electromagnetic brake, characterized in that: The invention comprises a motor housing (1), wherein a stator (2) is fixed in the motor housing (1), a motor shaft (3) is rotatably connected in the motor housing (1), a rotor (4) is fixed on the motor shaft (3) at a position corresponding to the stator (2), both ends of the motor shaft (3) extend out of the motor housing (1) to form a driving end and a braking end respectively, a fixing sleeve (5) is fixed outside the motor housing (1) at the braking end of the motor shaft (3), the braking end of the motor shaft (3) is inserted into the fixing sleeve (5), the braking end of the motor shaft (3) is connected to a plurality of internal friction ring plates (6), and a plurality of internal friction ring plates (6) are arranged between the braking end of the motor shaft (3) and the plurality of internal friction ring plates (6). An inner connection key (7) is provided, and the inner connection key (7) is arranged along the axial direction of the motor shaft (3); a plurality of outer friction ring sheets (8) are installed on the inner wall of the fixing sleeve (5); an outer connection key (9) is installed between the inner wall of the fixing sleeve (5) and the plurality of outer friction ring sheets (8); the outer connection key (9) is arranged along the axial direction of the motor shaft (3); the outer friction ring sheets (8) and the inner friction ring sheets (6) are distributed alternately; a first wave spring ring (10) is installed between adjacent outer friction ring sheets (8); and an inner end of the fixing sleeve (5) away from the motor housing (1) is connected to the inner side of the fixing sleeve (5) along the axial direction of the motor shaft (3) for squeezing the inner friction ring sheets (6) or The sliding sleeve (11) of the outer friction ring plate (8) is fixed with an end cover (12) at one end of the fixed sleeve (5) away from the motor housing (1); a DC coil (13) for adsorbing the sliding sleeve (11) is fixed on the side of the end cover (12) close to the sliding sleeve (11); a compression disc spring (14) for pushing the sliding sleeve (11) away from the end cover (12) is installed between the end cover (12) and the sliding sleeve (11); an insulating sleeve (18) is coaxially fixed to the end cover (12); a sliding groove (19) is provided at one end of the insulating sleeve (18) close to the sliding sleeve (11); a conductive sheet (22) is embedded in the inner wall of the sliding groove (19). 0), a conductive slide (21) is slidably connected in the slide groove (19), an insulating rod (22) is fixed between the conductive slide (21) and the sliding sleeve (11), the DC coil (13) is connected to two wires (23), one of the wires (23) is electrically connected to the conductive sheet (20), and the conductive slide (21) is connected to a power supply line (24); the conductive sheet (20) is in the shape of a long strip, and the conductive sheet (20) is embedded in the inner wall of the slide groove (19) along the depth direction of the slide groove (19), the conductive slide (21) is a copper sheet, and a top poking rod (34) is fixed at the bottom of the slide groove (19) near the conductive sheet (20).

2. A traction motor for a coal mining machine with an electromagnetic brake according to claim 1, characterized in that: A second wave spring ring (15) is installed between adjacent inner friction ring plates (6).

3. The traction motor for coal mining machine with electromagnetic brake according to claim 1, characterized in that: The end cover (12) is provided with a through hole (16), a brake release bolt (17) is connected between the end cover (12) and the sliding sleeve (11), and the tail of the brake release bolt (17) passes through the through hole (16) and is threadedly connected to the sliding sleeve (11).

4. The traction motor for coal mining machine with electromagnetic brake according to claim 1, characterized in that: A sliding hole (25) is provided in the insulating sleeve (18) along its axial direction, a scale rod (26) is fixed to the side of the conductive sliding piece (21) away from the sliding sleeve (11), the scale rod (26) is slidably arranged in the sliding hole (25), and one end of the scale rod (26) away from the conductive sliding piece (21) extends out of the insulating sleeve (18) and has a plurality of scale grooves (27) along its length direction.

5. The traction motor for coal mining machine with electromagnetic brake according to claim 1, characterized in that: A cylindrical protrusion (28) is fixed to the side of the end cover (12) close to the motor shaft (3), and a sliding groove (29) is provided on the sliding sleeve (11) to slide with the cylindrical protrusion (28), and the compression disc spring (14) is located in the sliding groove (29).

6. A traction motor for a coal mining machine with an electromagnetic brake according to claim 5, characterized in that: A first sealing ring (30) is arranged between the outer wall of the sliding sleeve (11) and the inner wall of the fixed sleeve (5), a second sealing ring (31) is arranged between the outer wall of the cylindrical protrusion (28) and the inner wall of the sliding groove (29), and the DC coil (13) is coaxially arranged between the first sealing ring (30) and the second sealing ring (31).

7. A traction motor for a coal mining machine with an electromagnetic brake according to claim 6, characterized in that: A sealing gasket (32) is fixed between the end cover (12) and the fixing sleeve (5).

8. A traction motor for a coal mining machine with an electromagnetic brake according to claim 7, characterized in that: A plug-in ring groove (33) for plugging and matching with the DC coil (13) is provided on the side of the sliding sleeve (11) close to the end cover (12), and the depth of the plug-in ring groove (33) is greater than the height of the DC coil (13).

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