Forced air-cooled braking device for mine truck with electric wheels and cooling method of forced air-cooled braking device

Abstract

The invention discloses a forced air-cooled brake device for an electric wheel mine truck, which comprises a brake device and a traction motor, the traction motor comprises a rotor shaft, an inner shell and an outer shell, the rotor shaft is provided with an axial hole, a first radial through hole and a second radial through hole, and the first radial through hole and the second radial through hole are respectively communicated with the axial hole; an inner shell and an outer shell are arranged at the two ends of the traction motor respectively, and ventilation holes are formed in the inner shell. The brake device comprises an adapter and a brake disc, the adapter is provided with an inner diversion trench, the cylindrical surface is provided with an outer diversion trench, and an inclined hole is formed between the outer diversion trench and the inner diversion trench; the left side end part of the rotor shaft is mounted in the blind hole; the second through hole is communicated with the outer diversion trench; the brake disc is provided with a second through hole and a radial air channel communicated with the inner circumferential face and the outer circumferential face of the brake disc. The invention further discloses a cooling method of the forced air-cooled braking device for the mine truck with the electric wheels. The heat dissipation efficiency during braking is effectively improved, and heat fade during braking is avoided.

Description

Technical Field

[0001] This invention belongs to the field of electric wheel mining vehicles, specifically relating to a forced air-cooled braking device and its cooling method for electric wheel mining vehicles. Background Technology

[0002] The electric wheel mining car adopts an electric transmission type, which is driven by a wheel motor consisting of a traction motor and a wheel-side reducer. One end of the rotor shaft of the traction motor is connected to the wheel-side reducer. The driving torque of the traction motor is transmitted to the wheel hub after the speed reduction and torque amplification effect of the wheel-side reducer, so as to realize power output.

[0003] The braking device, installed at the other end of the traction motor's rotor shaft, includes a brake disc and a brake caliper. The brake disc is rigidly connected to the rotor shaft and rotates synchronously, while the brake caliper remains fixed. When braking is applied, the traction motor does not output power, the brake caliper clamps the brake disc, and the braking torque is transmitted through the rotor shaft to the wheel-side reducer. After torque amplification by the wheel-side reducer, it is transmitted to the wheel hub, thus stopping or decelerating the electric wheeled mining vehicle. However, because the brake disc is rigidly connected to the traction motor, and the traction motor rotates at thousands of revolutions per minute, the brake disc also rotates at thousands of revolutions per minute. During braking, the friction between the brake pads and the brake disc generates a large amount of heat in a short time. This accumulated heat causes the brake disc temperature to rise, leading to thermal fade and affecting the overall braking performance, reliability, and safety of the vehicle. Summary of the Invention

[0004] The purpose of this invention is to provide a forced air-cooled braking device and its cooling method for electric wheel mining trucks. The device utilizes the cooling air from the traction motor to force-cool the braking device, effectively improving the heat dissipation efficiency during braking and preventing thermal fade during braking.

[0005] To achieve the above objectives, the technical solution used in this invention is: The electric wheel mining car's forced air-cooled braking device includes: a braking device and a traction motor. The traction motor includes: a rotor shaft, an inner housing, and an outer housing. The left end face of the rotor shaft is provided with a first threaded hole, and the left side has an outer conical surface. The rotor shaft is provided with an axial hole extending along the axial direction and a first radial through hole and a second radial through hole evenly distributed along the circumference. The first radial through hole and the second radial through hole are respectively connected to the axial hole. The two ends of the traction motor are respectively provided with an inner housing and an outer housing. The two ends of the rotor shaft extend to the outside of the inner housing and the outer housing, respectively. The first radial through hole and the second radial through hole are respectively located on both sides of the outer housing. The inner housing is provided with ventilation holes. The braking device includes: an adapter and a brake disc. The blind hole of the adapter has an inner conical surface. The inner conical surface is provided with an inner guide groove extending circumferentially, and the side is provided with a first through hole and a second threaded hole evenly distributed circumferentially. The second threaded hole is located outside the first through hole. The cylindrical surface is provided with an outer guide groove extending circumferentially. An oblique hole evenly distributed circumferentially is provided between the outer guide groove and the inner guide groove. The left end of the rotor shaft is installed in a blind hole, and the inner conical surface is fitted onto the outer conical surface. The second through hole connects to the outer guide groove. The sixth bolt passes through the first through hole and connects to the first threaded hole. The brake disc has a second through hole evenly distributed circumferentially and a radial air channel connecting the inner and outer circumferential surfaces of the brake disc. The radial air channel connects to the inner guide groove. The central through hole of the brake disc is installed on the adapter. The seventh bolt passes through the second through hole and connects to the second threaded hole.

[0006] Furthermore, the brake disc is provided with a first radial rib and a partition rib evenly distributed in the circumferential direction, and a flow divider rib is provided between the first radial rib and the partition rib. The first radial rib, the partition rib and the flow divider rib form a radial air duct connecting the inner and outer circumferential surfaces of the brake disc.

[0007] Furthermore, the taper of the inner conical surface is the same as the taper of the outer conical surface.

[0008] Furthermore, the rotor of the traction motor is integrally fixedly connected to the rotor shaft; the stator is circumferentially disposed on the outside of the rotor; the outer casing is fixedly connected to the stator by a first bolt; the inner casing is fixedly connected to the stator by a second bolt; the rotor shaft extends axially to the left side of the outer casing, and the rotor shaft is supported on the inner hole of the outer casing by an outer bearing; the rotor shaft extends axially to the right side of the inner casing, and the rotor shaft is supported on the inner hole of the inner casing by an inner bearing; the outer baffle is fixed to the outer casing by a third bolt, and its right side contacts the outer bearing; the outer limiting ring is fixedly connected in an interference fit to the annular groove on the outer circumference of the rotor shaft, and its right side contacts the outer bearing; an outer seal is provided on the contact surface between the outer baffle and the rotor shaft, and the outer seal is located between the outer limiting ring and the outer baffle; the inner baffle is fixed to the inner casing by a fourth bolt, and its left side contacts the inner bearing; the inner limiting ring is fixedly connected in an interference fit to the annular groove on the outer circumference of the rotor shaft, and its left side contacts the inner bearing; an inner seal is provided on the contact surface between the inner baffle and the rotor shaft, and the inner seal is located between the inner limiting ring and the inner baffle.

[0009] Furthermore, the second radial through hole connects the outer conical surface and the axial hole, and the traction motor is integrally fixed to the frame by means of the fifth bolt. The traction motor is installed in the cavity inside the frame.

[0010] Furthermore, the braking device is installed on the left side of the traction motor and also includes: a brake, a positioning block, and a seventh bolt passing through the second through hole of the brake disc and connecting to the second threaded hole of the adapter, so that the brake disc and the adapter are integrally fixedly connected; the brake is integrally fixedly connected to the outer housing of the traction motor by means of the eighth bolt and the positioning block, and the friction pads of the brake are located on both sides of the brake disc.

[0011] Cooling methods for forced air-cooled braking devices in electric wheel mining trucks include: The cooling fan applies cooling air to the traction motor. The cooling air enters the traction motor through the ventilation holes on the inner housing of the traction motor. After passing through the rotor and stator of the traction motor, the cooling air reaches the space between the outer housing and the rotor, carrying away the heat from the rotor and stator. During braking, the friction pads of the brake clamp the brake disc under the thrust of the piston. The friction pads rub against the brake disc and generate heat. The heat accumulates on the brake disc. Cooling air enters the inner guide groove of the adapter through the first radial through hole, axial hole and second radial through hole on the rotor shaft. Cooling air enters the outer guide groove through the oblique hole on the adapter and is discharged outward through the radial air passage of the brake disc, carrying away the heat of the brake disc.

[0012] Preferably, during operation, the cooling fan will forcefully and continuously apply cooling air to the traction motor, thereby forcibly cooling the traction motor. The cooling air is blown axially from the inside to the outside towards the traction motor in the cavity inside the frame.

[0013] Preferably, the cooling fan starts simultaneously with the start of the electric wheel mining vehicle.

[0014] Preferably, in the oblique hole, the cooling air passes through the split rib and is discharged from the two radial air channels, washing over the first radial rib and the partition rib, thereby enhancing the heat exchange efficiency of the first radial rib and the partition rib.

[0015] The technical effects of this invention include: This invention utilizes the cooling air from the traction motor to forcibly cool the braking device, effectively improving the heat dissipation efficiency of the brake disc, thereby controlling the temperature rise during braking, avoiding thermal fade problems, and maintaining stable braking performance. The forced air-cooled brake disc of the electric wheel mining truck adopts a forced air-cooling design, effectively improving heat dissipation efficiency during braking, preventing thermal fade during braking, maintaining stable braking performance, and greatly improving the reliability and safety of the entire vehicle.

[0016] When braking is applied, the friction pads of the brake clamp the brake disc under the thrust of the piston. The friction pads rub against the brake disc and generate heat, which accumulates on the brake disc. Since the traction motor needs to be cooled in real time during operation, the cooling fan starts simultaneously with the start of the electric wheel mining car. Cooling air flows continuously through the radial air duct of the brake disc, thereby carrying away the heat generated by friction from the brake disc in real time. This achieves forced air cooling of the brake disc, which can effectively improve the heat dissipation efficiency during braking. Correspondingly, it achieves forced air cooling of the braking device. Attached Figure Description

[0017] Figure 1 This is a partial view of the forced air-cooled braking device for the electric wheel mining truck in this invention; Figure 2 This is a cross-sectional view from another angle of the forced air-cooled braking device for electric wheel mining trucks in this invention; Figure 3 yes Figure 2 Enlarged view of the vicinity of the central braking device; Figure 4 This is an isometric view of the rotor shaft of the present invention located on one side of the braking device; Figure 5 This is an isometric view of the adapter in this invention; Figure 6 This is an isometric view of the adapter in this invention from another angle; Figure 7 This is an isometric view of the brake disc in this invention; Figure 8 yes Figure 7 A cross-sectional view.

[0018] Explanation of reference numerals in the attached figures: 1-Wheel motor; 2-Frame; 3-Traction motor; 31-Rotor shaft; 31a-Outer conical surface; 31b-First threaded hole; 31c-First radial through hole; 31d-Axial hole; 31e-Second radial through hole; 32-Rotor; 33-Stator; 34-Inner housing; 34a-Ventilation hole; 35-Outer housing; 36-First bolt; 37-Second bolt; 38-Inner bearing; 39-Outer bearing; 40-Outer baffle; 41-Inner baffle; 42-Outer limiting ring; 43-Inner limiting ring; 44-Outer seal; 45-Inner seal; 46-Third bolt; 47-Fourth bolt; 5-Fifth bolt; 6-Brake device, 61-Adapter, 61a-Inner conical surface, 61b-First through hole, 61c-Inner guide groove, 61d-Outer guide groove, 61e-Angled hole, 61f-Second threaded hole, 62-Sixth bolt, 63-Brake disc, 63a-Second through hole, 63b-First radial rib, 63c-Separator rib, 63d-Flow divider rib, 63e-Radial air duct, 64-Seventh bolt, 65-Brake, 651-Friction pad, 66-Positioning block, 67-Eighth bolt O - Central axis, W - Cooling air. Detailed Implementation

[0019] The following description fully illustrates specific embodiments of the present invention to enable those skilled in the art to practice and reproduce it. To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0020] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. In addition, the terms "first," "second," "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0021] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0022] The following describes in detail, with reference to the accompanying drawings, the specific embodiments of the forced air-cooled braking device and cooling method for electric wheel mining trucks involved in this invention.

[0023] The direction along the central axis O is called the "axial direction". The direction of the tangent at any point rotating around the central axis O is called the "circumferential direction". The direction that intersects the central axis O and is perpendicular to the central axis O is called the "radial direction".

[0024] Referring to the orientation of the accompanying drawings, one side of the braking device in the drawings will be referred to as the "left side" or "outer side," and the other side as the "right side" or "inner side."

[0025] like Figure 1 The image shown is a partial view of the forced air-cooled braking device for the electric wheel mining vehicle of the present invention; it shows the installation position of the traction motor 3, the installation position of the braking device 6 relative to the traction motor 3, and the connection type.

[0026] like Figure 2 The image shown is a cross-sectional view from another angle of the forced air-cooled braking device for electric wheel mining trucks in this invention.

[0027] like Figure 3 As shown, is Figure 2 An enlarged view of the area near the central braking device 6.

[0028] The electric wheel mining car has a forced air-cooled braking device, which includes a braking device 6 and a traction motor 3. The traction motor 3 is fixed on the frame 2 and forms a wheel motor 1.

[0029] The traction motor 3 is integrally fixed to the frame 2 by means of the fifth bolt 5, and the traction motor 3 is installed in the cavity inside the frame 2.

[0030] The traction motor 3 includes: a rotor shaft 31, a rotor 32, a stator 33, an inner housing 34, and an outer housing 35. The rotor 32 of the traction motor 3 is integrally fixedly connected to the rotor shaft 31; the stator 33 is circumferentially disposed on the outside of the rotor 32; the outer housing 35 is fixedly connected to the stator 33 by means of a first bolt 36; the inner housing 34 is fixedly connected to the stator 33 by means of a second bolt 37; the rotor shaft 31 extends axially to the left side of the outer housing 35, and the rotor shaft 31 is supported on the inner hole of the outer housing 35 in a rotatable manner by means of an outer bearing 39; the rotor shaft 31 extends axially to the right side of the inner housing 34, and the rotor shaft 3... 1. The inner bearing 38 is rotatably supported on the inner hole of the inner housing 34; the outer baffle 40 is fixed to the outer housing 35 by the third bolt 46, and its right side contacts the outer bearing 39, thereby limiting the outer bearing 39 along the axial direction; the outer limiting ring 42 is fixedly connected to the annular groove on the outer circumference of the rotor shaft 31 by interference fit, and its right side contacts the outer bearing 39, thereby limiting the outer bearing 39 along the axial direction; the contact surface between the outer baffle 40 and the rotor shaft 31 is provided with an outer seal 44, which is located between the outer limiting ring 42 and the outer baffle 40, thereby achieving sealing between the inside and outside of the traction motor 31. The inner baffle 41 is fixed to the inner housing 34 by means of the fourth bolt 47, and its left side contacts the inner bearing 38, thereby limiting the inner bearing 38 along the axial direction. The inner limiting ring 43 is fixedly connected to the annular groove on the outer circumference of the rotor shaft 31 by interference fit, and its left side contacts the inner bearing 38, thereby limiting the inner bearing 38 along the axial direction. An inner seal 45 is provided on the contact surface between the inner baffle 41 and the rotor shaft 31. The inner seal 45 is located between the inner limiting ring 43 and the inner baffle 41, thereby achieving sealing between the inside and outside of the traction motor 31.

[0031] like Figure 4 The figure shown is an isometric view of the rotor shaft 31 of the present invention located on one side of the braking device 6.

[0032] The inner shell 34 has ventilation holes 34a evenly distributed along the circumference. The outer shell 35 is a solid structure without ventilation holes.

[0033] The extended end of the rotor shaft 31 on one side of the housing 35 has an outer conical surface 31a, an axial hole 31d extending along the axial direction, and a second radial through hole 31e evenly distributed along the circumference. The second radial through hole 31e connects the outer conical surface 31a and the axial hole 31d. The left end face of the rotor shaft 31 is provided with a first threaded hole 31b evenly distributed in the circumferential direction; the rotor shaft 31 is provided with a first radial through hole 31c evenly distributed in the circumferential direction at the position between the outer bearing 39 and the rotor 32, and the first radial through hole 31c communicates with the axial hole 31d.

[0034] The first radial through hole 31c and the second radial through hole 31e are located on both sides of the outer casing 35.

[0035] like Figure 5 The image shown is an isometric view of the adapter 61 in this invention; as shown... Figure 6 The image shown is an isometric view of the adapter 61 from another angle in this invention; as shown... Figure 7 The image shown is an isometric view of the brake disc 63 in this invention; as shown... Figure 8 As shown, is Figure 7 A cross-sectional view.

[0036] The braking device 6 is installed on the left (outer side) side of the traction motor 3 and includes: adapter 61, sixth bolt 62, brake disc 63, seventh bolt 64, brake 65, positioning block 66, and eighth bolt 67.

[0037] The inner hole (blind hole) of the adapter 61 has an inner conical surface 61a. An inner guide groove 61c extending in the circumferential direction is provided on the inner conical surface 61a. A first through hole 61b and a second threaded hole 61f (located on different sides, with the first through hole 61b located on the end face and the second threaded hole 61f located on the right side of the end face) are respectively provided on its two sides. An outer guide groove 61d extending in the circumferential direction is provided on its cylindrical surface (the side on the left side). An oblique hole 61e extending in the circumferential direction is provided between the outer guide groove 61d and the inner guide groove 61c, thereby realizing the connection between the outer guide groove 61d and the inner guide groove 61c.

[0038] The taper of the inner conical surface 61a of the adapter 61 is the same as the taper of the outer conical surface 31a of the rotor shaft.

[0039] The brake disc 63 is a disc-shaped object with a central opening. It has second through holes 63a evenly distributed circumferentially. Inside the brake disc 63, there are first radial ribs 63b and partition ribs 63c evenly distributed circumferentially. A flow divider rib 63d is provided between the first radial ribs 63b and partition ribs 63c. A radial air passage 63e connecting the inner and outer circumferential surfaces of the brake disc is formed between the first radial ribs 63b, partition ribs 63c and flow divider ribs 63d. The first radial ribs 63b and partition ribs 63c are connected to the inner and outer circumferential surfaces at both ends. The second through hole 63a passes through the first radial rib 63b.

[0040] The sixth bolt 62 passes through the first through hole 61b of the adapter 61 and connects to the first threaded hole 31b of the rotor shaft 31. Correspondingly, the inner conical surface 61a of the adapter 61 contacts and is pressed against the outer conical surface 31a of the rotor shaft 31, thus realizing the fixed connection between the adapter 61 and the rotor shaft 31. The inner guide groove 61c of the adapter 61 is aligned with the second radial through hole 31e of the rotor shaft 31.

[0041] The inner circumferential surface of the brake disc 63 and the stop on the left side of the outer guide groove 61d of the adapter 61 are fitted with a small clearance to achieve coaxial positioning of the brake disc 63 and the adapter 61. The seventh bolt 64 passes through the second through hole 63a of the brake disc 63 and connects to the second threaded hole 61f of the adapter 61, so that the brake disc 63 and the adapter 61 are integrally fixedly connected.

[0042] The brake 65 is integrally fixed to the outer housing 35 of the traction motor 3 by means of the eighth bolt 67 and the positioning block 66. The positioning block 66 is located between the brake 65 and the outer housing 35 and is provided with a positioning block through hole. The brake 65 is centered relative to the brake disc, and the friction pads 651 of the brake are located on both sides of the brake disc 63.

[0043] like Figure 8 The image shown is a partial cross-sectional view of the electric wheel motor of the mine car in this invention; it shows the flow direction of the cooling air W of the traction motor 3 and the path through which the cooling air W flows out to the outside.

[0044] Cooling methods for forced air-cooled braking devices in electric wheel mining trucks include: Step 1: The cooling fan applies cooling air W to the traction motor 3. The cooling air W enters the traction motor 3 through the ventilation hole 34a on the inner housing 34 of the traction motor 3. After passing through the rotor 32 and stator 33 of the traction motor 3, the cooling air W reaches the space between the outer housing 35 and the rotor 32, and carries away the heat of the rotor 32 and stator 33. During operation, the cooling fan installed on the electric wheel mining car will force and continuously apply cooling air W to the traction motor 3 to achieve forced cooling of the traction motor 3. The cooling air W is blown axially from the inside to the outside of the cavity inside the frame 2 towards the traction motor 3.

[0045] Since the traction motor 3 needs to be cooled in real time during operation, the cooling fan starts simultaneously with the start of the electric wheel mining car.

[0046] Step 2: During braking, the friction pads 651 of the brake 65 clamp the brake disc 63 under the thrust of the piston. The friction pads 651 rub against the brake disc 63 and generate heat. The heat accumulates on the brake disc 63. The cooling air W enters the inner guide groove 61c of the adapter 61 through the first radial through hole 31c, the axial hole 31d and the second radial through hole 31e on the rotor shaft 31. The cooling air W enters the outer guide groove 61d through the oblique hole 61e on the adapter 61. After passing through the radial air passage 63e of the brake disc 63, the heat of the brake disc 63 is carried away and discharged outward from the radial air passage 63e.

[0047] Cooling air W flows continuously through the radial air duct 63e, thereby carrying away the heat generated by friction from the brake disc 63 in real time, realizing forced air cooling of the brake disc 63, which can effectively improve the heat dissipation efficiency during braking, and correspondingly realizing forced air cooling of the braking device 6.

[0048] In the oblique hole 61e, the cooling air W passes through the diversion rib 63d and is discharged from the two radial air channels 63e, washing the first radial rib 63b and the partition rib 63c, thereby enhancing the heat exchange efficiency of the first radial rib 63b and the partition rib 63c.

[0049] The electric wheel mining car forced air-cooled braking device and cooling method according to the above scheme can make full use of the cooling air W of the traction motor to force air-cool the brake disc. The cooling air W is blown out evenly from the inside to the outside through the internal air duct, which can fully cool the brake disc, with high heat dissipation efficiency and convenient implementation.

[0050] The terminology used in this invention is descriptive and exemplary, not restrictive. Since this invention can be embodied in many forms without departing from the spirit or essence of the technical solution, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims. Therefore, all variations and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A forced air-cooled braking device for an electric wheeled mining truck, comprising: A braking device and a traction motor, characterized in that the traction motor comprises: a rotor shaft, an inner housing, and an outer housing; a first threaded hole is provided on the left end face of the rotor shaft, and the left side has an outer conical surface; the rotor shaft is provided with an axial hole extending along the axial direction and a first radial through hole and a second radial through hole evenly distributed along the circumference, the first radial through hole and the second radial through hole respectively communicating with the axial hole; an inner housing and an outer housing are respectively provided at both ends of the traction motor, and both ends of the rotor shaft extend to the outside of the inner housing and the outer housing respectively; the first radial through hole and the second radial through hole are respectively located on both sides of the outer housing, and the inner housing is provided with ventilation holes; the braking device comprises: an adapter and a brake disc; the blind hole of the adapter has an inner conical surface, and the inner conical surface is provided with... An inner guide groove extending circumferentially has a first through hole and a second threaded hole evenly distributed circumferentially on its side. The second threaded hole is located outside the first through hole. An outer guide groove extending circumferentially is provided on the cylindrical surface. An oblique hole evenly distributed circumferentially is provided between the outer guide groove and the inner guide groove. The left end of the rotor shaft is installed in a blind hole. The inner conical surface is fitted onto the outer conical surface. The second through hole connects to the outer guide groove. The sixth bolt passes through the first through hole and connects to the first threaded hole. The brake disc has a second through hole evenly distributed circumferentially and a radial air duct connecting the inner and outer circumferential surfaces of the brake disc. The radial air duct connects to the inner guide groove. The central through hole of the brake disc is installed on the adapter. The seventh bolt passes through the second through hole and connects to the second threaded hole.

2. The forced air-cooled braking device for electric wheel mining trucks as described in claim 1, characterized in that, The brake disc has a first radial rib and a partition rib evenly distributed in the circumferential direction inside. A flow divider rib is provided between the first radial rib and the partition rib. The first radial rib, the partition rib and the flow divider rib form a radial air duct connecting the inner and outer circumferential surfaces of the brake disc.

3. The forced air-cooled braking device for electric wheel mining trucks as described in claim 1, characterized in that, The taper of the inner conical surface is the same as that of the outer conical surface.

4. The forced air-cooled braking device for electric wheel mining trucks as described in claim 1, characterized in that, The rotor of the traction motor is integrally fixed to the rotor shaft; the stator is circumferentially disposed on the outside of the rotor; the outer casing is fixedly connected to the stator by a first bolt; the inner casing is fixedly connected to the stator by a second bolt; the rotor shaft extends axially to the left side of the outer casing, and the rotor shaft is supported on the inner hole of the outer casing by an outer bearing; the rotor shaft extends axially to the right side of the inner casing, and the rotor shaft is supported on the inner hole of the inner casing by an inner bearing; the outer baffle is fixed to the outer casing by a third bolt, and its right side contacts the outer bearing; the outer limiting ring is fixedly connected to the annular groove on the outer circumference of the rotor shaft by an interference fit, and its right side contacts the outer bearing; an outer seal is provided on the contact surface between the outer baffle and the rotor shaft, and the outer seal is located between the outer limiting ring and the outer baffle; the inner baffle is fixed to the inner casing by a fourth bolt, and its left side contacts the inner bearing; the inner limiting ring is fixedly connected to the annular groove on the outer circumference of the rotor shaft by an interference fit, and its left side contacts the inner bearing; an inner seal is provided on the contact surface between the inner baffle and the rotor shaft, and the inner seal is located between the inner limiting ring and the inner baffle.

5. The forced air-cooled braking device for electric wheel mining trucks as described in claim 1, characterized in that, The second radial through hole connects the outer conical surface and the axial hole. The traction motor is integrally fixed to the frame by means of the fifth bolt. The traction motor is installed in the cavity inside the frame.

6. The forced air-cooled braking device for electric wheel mining trucks as described in claim 4, characterized in that, The braking device is installed on the left side of the traction motor and also includes: a brake and a positioning block. The seventh bolt passes through the second through hole of the brake disc and connects to the second threaded hole of the adapter, so that the brake disc and the adapter are fixedly connected as a whole. The brake is fixedly connected to the outer housing of the traction motor by means of the eighth bolt and the positioning block. The friction pads of the brake are located on both sides of the brake disc.

7. The cooling method for the forced air-cooled braking device of the electric wheel mining car as described in claim 1, characterized in that, include: The cooling fan applies cooling air to the traction motor. The cooling air enters the traction motor through the ventilation holes on the inner housing of the traction motor. After passing through the rotor and stator of the traction motor, the cooling air reaches the space between the outer housing and the rotor, carrying away the heat from the rotor and stator. During braking, the friction pads of the brake clamp the brake disc under the thrust of the piston. The friction pads rub against the brake disc and generate heat. The heat accumulates on the brake disc. Cooling air enters the inner guide groove of the adapter through the first radial through hole, axial hole and second radial through hole on the rotor shaft. Cooling air enters the outer guide groove through the oblique hole on the adapter and is discharged outward through the radial air passage of the brake disc, carrying away the heat of the brake disc.

8. The cooling method for the forced air-cooled braking device of the electric wheel mining car as described in claim 7, characterized in that, During operation, the cooling fan will forcefully and continuously apply cooling air to the traction motor, thus forcibly cooling the traction motor. The cooling air is blown axially from the inside to the outside of the traction motor in the cavity inside the frame.

9. The cooling method for the forced air-cooled braking device of the electric wheel mining car as described in claim 7, characterized in that, The cooling fan starts simultaneously with the start of the electric wheel mining truck.

10. The cooling method for the forced air-cooled braking device of the electric wheel mining car as described in claim 7, characterized in that, In the oblique hole, the cooling air passes through the split rib and is discharged from the two radial air channels, washing the first radial rib and the partition rib, and enhancing the heat exchange efficiency of the first radial rib and the partition rib.

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