CN215621934U - Rear braking system of mining dump truck with electric wheels - Google Patents

Abstract

The utility model particularly relates to a rear braking system of an electric wheel mining dump truck, which comprises a traction motor, a wet brake and a wheel-side reducer, wherein the input end of the wheel-side reducer is in transmission connection with the output end of the traction motor, the output end of the wheel-side reducer is in transmission connection with a wheel hub, and a converter is arranged on the traction motor; the wet brake comprises a brake shell, an elastic part, a brake piston and a friction plate set, wherein the traction motor and the brake shell are fixedly arranged on the electric wheel support, a brake oil cavity is formed in the brake shell, the brake piston is arranged in the brake oil cavity, an accommodating cavity is formed between the brake piston and the brake shell, the elastic part is arranged in the accommodating cavity, the friction plate set is arranged between the brake piston and the drive plate, when hydraulic oil pressure is introduced into the brake oil cavity, the elastic part is in a compression state and the friction plate set is in a disengagement state, and when the hydraulic oil pressure in the brake oil cavity is reduced, the elastic part drives the brake piston to move towards the friction plate set, so that the friction plate set is combined with each other.

Description

Rear braking system of mining dump truck with electric wheels

Technical Field

The utility model belongs to the technical field of brake systems of mining dump trucks, and particularly relates to a rear brake system of an electric wheel mining dump truck.

Background

At present, the mining dump truck is widely applied to industries such as metallurgy, mines, water conservancy and hydropower, undertakes transportation tasks such as minerals, earthwork and the like, is professional equipment, and belongs to off-highway vehicles. The mining dump truck can be divided into a mechanical type and an electric type according to different power driving modes, wherein the electric type is divided into a direct current electric type and an alternating current electric type. Early mining dump trucks, which were small in tonnage and all mechanically driven, were widely accepted and used by users since the first electric-driven mining dump truck produced in the united states of the 20 th century 70 (UnitRig). The development of power electronic devices is changing day by day, the future of the power electronic devices is full of machines, and the development of a new generation of composite, modularized and high-dynamic-parameter power electronic devices with high current, high junction temperature, high frequency and high voltage resistance can promote the development of an alternating-current variable-frequency speed regulation technology and a mining electric wheel dump truck technology.

The mining dump truck with the electric wheels has the characteristics of short carrying distance, small turning radius and large bearing capacity. According to the statistical analysis of the user cost, the larger the effective loading mass of the mining dump truck with the electric wheels is, the lower the unit transportation cost is. In the last years, 120 t-grade, 150 t-grade and 170 t-grade electric wheel mining dump trucks are mainstream products in the market, and at present, 190 t-grade, 220 t-grade and 290 t-grade electric wheel mining dump trucks are widely applied, and the maximum tonnage is developed to 450t grade. The mining dump truck with the electric wheels is further developed towards larger size in the future.

The existing alternating current transmission mining dump truck comprises a frame, a carriage, a cab, an alternating current transmission driving system, a suspension system, a hydraulic system, a front axle assembly, a rear axle assembly, tires and the like. The existing rear axle adopts a shoe brake, a caliper disc brake or a wet brake, the friction plate of the shoe brake or the caliper disc brake has large loss, and the long-time braking performance is reduced; the wet brake includes: service braking, parking braking and cooling system. The existing wet brake has the following defects: (1) the wet brake has a complex structure, occupies a large space and has a large size of the electric wheel assembly; (2) the service brake is used as a slow service brake, and a large heat dissipation device is needed for the brake energy; (3) the service life of the service brake is short; (4) brake energy recovery cannot be achieved; (5) the wet brake has a complicated structure and high cost.

SUMMERY OF THE UTILITY MODEL

The utility model provides a rear brake system of an electric wheel mining dump truck, which aims to solve the problems that a wet brake in the prior art is complex in structure and generates large heat when being used for slow running braking.

In order to solve the technical problems, the technical scheme adopted by the utility model is that the rear braking system of the electric wheel mining dump truck comprises a traction motor, a wet brake and a wheel-side speed reducer, wherein the traction motor is fixedly arranged on an electric wheel support of the mining dump truck, the input end of the wheel-side speed reducer is in transmission connection with the output end of the traction motor, the output end of the wheel-side speed reducer is in transmission connection with a wheel hub of the mining dump truck, and a converter is arranged on the traction motor;

the wet brake comprises a brake shell, an elastic part, a brake piston and a friction plate set, wherein the brake shell is fixedly arranged on an electric wheel support, a brake oil cavity is formed in the brake shell, the brake piston is arranged in the brake oil cavity, an accommodating cavity is formed between the brake piston and the brake shell, the elastic part is arranged in the accommodating cavity, the friction plate set is arranged between the brake piston and a driving disc of the mining dump truck, when hydraulic oil is introduced into the brake oil cavity, the elastic part is in a compression state, meanwhile, the friction plate set is in a disengagement state, and when the hydraulic oil pressure in the brake oil cavity is reduced, the elastic part drives the brake piston to move towards the friction plate set, and meanwhile, the friction plate set is combined with each other.

Preferably, the traction motor and the brake housing are both fixedly arranged on the rear axle housing through the electric wheel support, the brake housing is sleeved on the periphery of the electric wheel support, and the output end of the traction motor penetrates through the brake housing. The rear braking system of the mining dump truck with the electric wheels has the advantages of simple and reliable structure, reasonable and compact design and small occupied space.

Preferably, the rear braking system of the mining dump truck with the electric wheels further comprises a braking resistor or an energy recovery device, and the converter is electrically connected between the traction motor and the braking resistor or the energy recovery device. When the vehicle runs, the driving torque of the traction motor is decelerated and increased through the hub reduction gear, and the power is output by the hub to drive the tire outside the hub to rotate so as to drive the vehicle to run; the traction working condition is cut off, the inertia force of the vehicle drives the traction motor to rotate through the wheel-side speed reducer, the traction motor operates as a generator, three-phase alternating current is converted into direct current after passing through the converter, the direct current is consumed through the brake resistor, or the direct current is recycled by the energy recovery device, the resource utilization rate is improved, and the use cost is reduced.

Preferably, a piston sealing piece is arranged between the brake piston and the brake housing, a small rotary sealing piece is arranged between the brake housing and the driving disc, and a large rotary sealing piece is arranged between the electric wheel support and the driving disc.

Preferably, the elastic member is a spring. The elastic function of the spring is stable and reliable, and the cost is low.

Preferably, the friction plate set comprises a plurality of dynamic friction plates and static friction plates which are sequentially arranged at intervals along the axial direction of the hub, and the dynamic friction plates are fixedly arranged on the driving plate. The friction braking function of the friction plate set is stable and reliable.

Further, the rear brake system of the mining dump truck with the electric wheels further comprises a vehicle controller, an electric brake pedal and a hydraulic brake pedal, wherein the electric brake pedal, the converter and the brake resistor or the energy recovery device are electrically connected with the vehicle controller, and the vehicle controller also receives a wheel hub rotating speed signal; the hydraulic brake device is characterized in that a pedal valve and an electromagnetic valve are sequentially arranged between the hydraulic brake pedal and the brake oil cavity, the pedal valve and the electromagnetic valve are both connected with pressure oil and an oil tank, and the electromagnetic valve is electrically connected with a vehicle controller. The rear brake system of the mining dump truck with the electric wheels realizes the ingenious combination of electric braking and hydraulic braking.

Further, the electric brake pedal and the hydraulic brake pedal are arranged independently, or the electric brake pedal and the hydraulic brake pedal are two-in-one pedals, the electric brake pedal is arranged at the front part of the pedal in a downward stepping mode, and the hydraulic brake pedal is arranged at the rear part of the pedal in the downward stepping mode. The electric brake pedal and the hydraulic brake pedal are simple and reliable in structure and convenient to operate.

Further, the rear brake system of the mining dump truck with the electric wheels further comprises an emergency brake button and a parking brake switch which are electrically connected with the vehicle controller. When emergency needs to stop quickly, an emergency brake button is pressed, signals are input to a vehicle controller, after the vehicle controller receives the emergency brake signals, traction signals are cut off, electric brake and hydraulic brake are applied to the maximum value at the same time, the vehicle is forced to stop quickly, and the safety of the vehicle is improved; when the parking brake switch is pressed down, hydraulic oil of the system enters the wet brake through the pedal valve and the electromagnetic valve to force the elastic piece to compress, no braking force is generated between the friction plate sets, the vehicle runs normally, pedal operation is not needed, and the working strength is reduced.

Further, the rear brake system of the mining dump truck with the electric wheels further comprises a first pressure sensor and a second pressure sensor which are electrically connected with the vehicle controller, the first pressure sensor is arranged in an oil way leading to the brake oil cavity, the second pressure sensor is arranged in a hydraulic brake oil way connected with the pedal valve, and a one-way valve is arranged between the second pressure sensor and the pedal valve. The vehicle controller judges whether hydraulic braking is applied or not according to a signal of the first pressure sensor, and when the hydraulic braking is applied, the vehicle controller firstly sends a signal for forbidding traction to cut off the traction power of a traction motor, so that the simultaneous work of acceleration and braking is prevented, and a braking system is prevented from being damaged; in the running process of the vehicle, if a hydraulic brake oil way fault occurs, the system pressure is reduced, at the moment, the second pressure sensor inputs a signal to the vehicle controller, the vehicle controller judges according to the pressure value to remind a driver, and if the pressure is continuously reduced, the speed limit treatment is carried out on the vehicle, so that the running safety is guaranteed; when the vehicle runs and the pressure in front of the check valve is rapidly reduced, the releasing pressure of the wet brake spring is still kept due to the one-way partition function, the vehicle can be decelerated through electric braking, and damage caused by rapid wet braking is avoided.

Has the advantages that: according to the rear brake system of the mining dump truck with the electric wheels, the friction area of the wet brake is more than 10 times that of a shoe brake with the same tonnage and more than 30 times that of a caliper disc brake, the wear rate is extremely low due to oil film contact between friction plate groups, and the electric brake is used as slow running brake, so that the working time is greatly reduced, the service life of the friction plates is long, the maintenance cost is low, and the attendance rate is improved; according to the rear brake system of the mining dump truck with the electric wheels, the wet brake is used as the parking brake and the service brake, and is not used as a retarder any more, so that the structure of the wet brake is simplified, and the brake system is simple in structure and convenient to control; the rear brake system of the mining dump truck with the electric wheels adopts electric braking as slow running braking, the traction motor operates as a generator during braking, mechanical energy transmitted to the traction motor from a wheel hub through a wheel edge reducer is consumed, so that braking force is generated, the energy recovery device recovers electric energy and releases the electric energy when needed, the use cost is reduced, and the recovery of braking energy is realized; the rear brake system of the mining dump truck with the electric wheels is combined with a wet brake to perform parking braking, the braking radius is large, the contact area of friction plates is large, spring force and hydraulic pressure directly act on a wheel hub, an intermediate execution element is not arranged, spring braking is automatically performed under the condition of no pressure, hidden dangers such as high temperature and even naked fire generated during braking are avoided due to an oil-cooled and fully-closed structure, heat fading is avoided due to the oil-cooled and fully-closed structure, the mining dump truck is not influenced by water, dust and other environments, the braking efficiency is stable, and braking is stable and safe.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic front view of a rear braking system of a mining dump truck with electric wheels according to the present invention;

FIG. 2 is a schematic view in partial section of the rear braking system of the mining dump truck with electric wheels according to the utility model;

FIG. 3 is a schematic diagram of the electric braking of the rear braking system of the mining dump truck with electric wheels according to the utility model;

FIG. 4 is a schematic illustration of the hydraulic braking of the rear braking system of the mining dump truck with electric wheels of the present invention in a parking brake application state;

fig. 5 is a schematic diagram of the hydraulic brake of the rear brake system of the mining dump truck with electric wheels, which is in a parking brake release state, according to the utility model.

In the figure: 1. traction motor, 2, wet brake, 2-1, brake shell, 2-2, brake oil cavity, 2-3, accommodating cavity, 2-4, spring, 2-5, brake piston, 2-6, friction plate group, 2-7, piston sealing piece, 2-8, small rotary sealing piece, 2-9, large rotary sealing piece, 3, hub reducer, 4, converter, 5, hub, 6, the emergency braking system comprises an electric wheel support, 7, an energy recovery device, 8, a vehicle controller, 9, an electric brake pedal, 10, a hydraulic brake pedal, 11, a pedal valve, 12, an electromagnetic valve, 13, a speed control switch, 14, a speed adjusting knob, 15, an emergency braking button, 16, a parking brake switch, 17, a first pressure sensor, 18, a second pressure sensor, 19, a one-way valve, 20 and a driving disc.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the utility model, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

As shown in fig. 1 to 5, the rear brake system of the mining dump truck with electric wheels comprises a traction motor 1, a wet brake 2 and a wheel reduction gear 3, the traction motor 1 is fixedly arranged on an electric wheel support 6 of the mining dump truck, the input end of the wheel-side reducer 3 is in transmission connection with the output end of the traction motor 1, the output end of the wheel-side speed reducer 3 is in transmission connection with a wheel hub 5 of the mining dump truck, a converter 4 is arranged on the traction motor 1, in order to improve the energy utilization rate of the rear braking system of the electric-wheel mining dump truck, the rear braking system of the electric-wheel mining dump truck further comprises an energy recovery device 7, the converter 4 is electrically connected between the traction motor 1 and a brake resistor or an energy recovery device 7, and the energy recovery device 7 of the embodiment is a lithium battery, a super capacitor or a combination of the lithium battery and the super capacitor or other types of recovery devices;

the wet brake 2 comprises a brake shell 2-1, an elastic part, a brake piston 2-5 and a friction plate group 2-6, wherein the brake shell 2-1 is fixedly arranged on an electric wheel support 6, a brake oil cavity 2-2 is arranged in the brake shell 2-1, the brake piston 2-5 is arranged in the brake oil cavity 2-2, an accommodating cavity 2-3 is arranged between the brake piston 2-5 and the brake shell 2-1, the elastic part is arranged in the accommodating cavity 2-3, the elastic part is a spring 2-4 in the embodiment, the friction plate group 2-6 is arranged between the brake piston 2-5 and a drive plate 20 of the mining dump truck, the friction plate group 2-6 in the embodiment comprises a plurality of dynamic friction plates and static friction plates which are sequentially arranged at intervals along the axial direction of a wheel hub 5, the brake device is characterized in that the dynamic friction plates are fixedly arranged on a driving disc 20, piston sealing pieces 2-7 are arranged between a brake piston 2-5 and a brake shell 2-1, small rotary sealing pieces 2-8 are arranged between the brake shell 2-1 and the driving disc 20, large rotary sealing pieces 2-9 are arranged between an electric wheel support 6 and the driving disc 20, when hydraulic oil is introduced into a brake oil cavity 2-2, the elastic pieces are in a compression state, meanwhile, friction plate groups 2-6 are in a disengagement state, when the hydraulic oil pressure in the brake oil cavity 2-2 is reduced, the elastic pieces drive the brake piston 2-5 to move towards the friction plate groups 2-6, and meanwhile, the friction plate groups 2-6 are combined with each other.

In order to enable the rear braking system of the mining dump truck with the electric wheels to be simpler and more reliable in structure, reasonable and compact in layout and small in occupied space, in the implementation, as shown in fig. 1, the traction motor 1 and the braking shell 2-1 are fixedly arranged on a rear axle housing through the electric wheel support 6, the braking shell 2-1 is sleeved on the periphery of the electric wheel support 6, and the output end of the traction motor 1 penetrates through the braking shell 2-1.

Specifically, in this embodiment, as shown in fig. 3 to 5, the rear brake system of the electric wheel mining dump truck further includes a vehicle controller 8, an electric brake pedal 9 and a hydraulic brake pedal 10, the electric brake pedal 9, the converter 4 and the energy recovery device 7 are all electrically connected to the vehicle controller 8, and the vehicle controller 8 further receives a rotation speed signal of the wheel hub 5; a pedal valve 11 and an electromagnetic valve 12 are sequentially arranged between the hydraulic brake pedal 10 and the brake oil cavity 2-2, the pedal valve 11 and the electromagnetic valve 12 are both connected with pressure oil and an oil tank, and the electromagnetic valve 12 is electrically connected with a vehicle controller 8; the electric brake pedal 9 and the hydraulic brake pedal 10 are independently arranged, or the electric brake pedal 9 and the hydraulic brake pedal 10 are two-in-one pedals, the front part of the pedal in a downward stepping mode is the electric brake pedal 9, and the rear part of the pedal in the downward stepping mode is the hydraulic brake pedal 10.

Specifically, in this embodiment, as shown in fig. 3 to 5, the rear brake system of the electric wheel mining dump truck further includes a speed control switch 13, a speed adjusting knob 14, an emergency brake button 15, a parking brake switch 16, a first pressure sensor 17 and a second pressure sensor 18, which are electrically connected to the vehicle controller 8, the first pressure sensor 17 is disposed in an oil path leading to the brake oil chamber 2-2, the second pressure sensor 18 is disposed in a hydraulic brake oil path connected to the pedal valve 11, and a check valve 19 is disposed between the second pressure sensor 18 and the pedal valve 11.

The working principle is as follows:

(1) work brake

When a vehicle running normally is overspeed or needs to be decelerated, working braking is adopted, electric braking is preferentially used according to the braking principle, and when the electric braking capacity is not enough to meet the requirement of quick braking, hydraulic braking is simultaneously applied. As shown in fig. 3, the electric brake pedal 9 is stepped on, a braking signal is input to the vehicle controller 8, the traction mode is cut off, the vehicle enters the braking mode from the traction mode, the magnitude of the braking force is determined by the vehicle controller 8 according to the rotating speed of the hub 5, the stepping depth signal of the brake pedal and the like, the converter 4 and the energy recovery device 7 work simultaneously, the traction motor 1 operates as a generator, the mechanical energy of the vehicle running is converted into electric energy, the electric energy is applied to the energy recovery device 7 through the converter 4, the mechanical energy is consumed, and the vehicle is decelerated; when the electric braking capability is insufficient, as shown in fig. 4, a hydraulic brake pedal 10 is stepped, a braking signal is input to a vehicle controller 8, an electromagnetic valve 12 is communicated with a hydraulic braking oil path, hydraulic oil in the wet brake 2 flows back to an oil tank, the pressure of the hydraulic oil is insufficient to overcome the pressure of a spring 2-4, the pressure of the spring 2-4 acts on a friction plate group 2-6 to generate braking force, and the braking force and the electric brake jointly decelerate the vehicle or stop the vehicle;

(2) parking brake and loading brake

The wet brake 2 is used as a parking brake, when the vehicle is parked for loading, dumping materials or parking for a long time, a parking brake switch 16 is pressed, a brake signal is input to a vehicle controller 8, an electromagnetic valve 12 is communicated with a hydraulic brake oil path, hydraulic oil in the wet brake 2 flows back to an oil tank, the pressure of the hydraulic oil is not enough to overcome the pressure of a spring 2-4, the pressure of the hydraulic oil acts on a friction plate group 2-6 by the force of the spring 2-4 to generate a brake force, and the rotation of the hub 5 is limited, so that the purpose of parking is achieved, as shown in fig. 4;

(3) slow-running brake

When the vehicle runs downhill, the vehicle needs to be stabilized at a certain speed, and the vehicle can be realized by continuously stepping on the electric brake pedal 9, and the working principle is the same as that of the electric brake in the working brake; the speed control switch 13 can also be switched on, the speed is adjusted by the speed adjusting knob 14, the speed adjusting signal is input to the vehicle controller 8, the vehicle controller 8 can automatically adjust the braking force according to the running condition of the vehicle, and the purpose of constant-speed running is achieved, as shown in fig. 3;

(4) overspeed braking

The highest speed allowing the vehicle to run can be set in the vehicle controller 8, the rotating speed signal of the hub 5 is input into the vehicle controller 8 and is converted into a vehicle speed signal according to vehicle configuration information, when the running speed of the vehicle exceeds the set vehicle speed, the vehicle controller 8 sends an electric braking instruction, the braking principle is the same as the electric braking in the working braking, the vehicle automatically decelerates, and the driving safety is ensured;

(5) emergency brake

As shown in fig. 4, an emergency brake button 15 is provided, when an emergency situation occurs and a quick stop is required, the emergency brake button 15 is pressed, a signal is input to the vehicle controller 8, and after the vehicle controller 8 receives the emergency brake signal, electric brake and hydraulic brake are simultaneously applied to the maximum value, so that the vehicle is forced to stop rapidly, and an accident is avoided;

(6) protective function

Firstly, protecting a parking brake, wherein when the parking brake works, the vehicle controller 8 judges whether the parking brake is put into use or not through a signal of a first pressure sensor 17, and the vehicle controller 8 prohibits entering a traction mode at the moment so as to prevent a system from being damaged;

and secondly, service brake protection, namely, the brake is prior, when the hydraulic brake is applied in the running state of the vehicle, the vehicle indicates that the vehicle needs to be decelerated, the vehicle controller 8 judges whether the hydraulic brake is applied or not through a signal of the first pressure sensor 17, and when the hydraulic brake is applied, the vehicle controller 8 firstly sends a signal for forbidding traction to cut off the power of the traction so as to prevent the brake from being damaged due to the simultaneous operation of the acceleration and the brake.

Protecting a brake at high speed, wherein when the speed of the vehicle is higher than a set protection speed value (such as 10km/h), a vehicle controller 8 outputs a signal to control an electromagnetic valve 12 to always keep a working state, and parking brake cannot be applied at the moment so as to prevent the friction disc groups 2-6 from being rapidly worn at high speed and suddenly braked to cause accidents;

the low brake pressure protection is adopted, when the brake hydraulic oil circuit is failed in the running process of the vehicle, the system pressure is reduced, the second pressure sensor 18 inputs signals to the vehicle controller 8 at the moment, the vehicle controller 8 judges according to the pressure value to remind a driver that the brake capacity is reduced, a larger safety distance is kept, and if the pressure is reduced continuously, the speed limit treatment is carried out on the vehicle to ensure the driving safety; the one-way valve 19 is arranged on the oil inlet of the pedal valve 11, so that the pressure is reduced when the vehicle runs, the pressure on the right side in the figure 5 can be prevented from being reduced immediately, and the brake system is protected.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and equivalent alternatives or modifications according to the technical solution of the present invention and the inventive concept thereof should be covered by the scope of the present invention.

Claims (10)

1. The utility model provides a mining dump truck rear brake system of electronic round which characterized in that: the mining dump truck traction system comprises a traction motor (1), a wet brake (2) and a wheel-side reducer (3), wherein the traction motor (1) is fixedly arranged on an electric wheel support (6) of the mining dump truck, the input end of the wheel-side reducer (3) is in transmission connection with the output end of the traction motor (1), the output end of the wheel-side reducer (3) is in transmission connection with a wheel hub (5) of the mining dump truck, and a converter (4) is arranged on the traction motor (1);

the wet brake (2) comprises a brake shell (2-1), an elastic part, a brake piston (2-5) and a friction plate group (2-6), the brake shell (2-1) is fixedly arranged on an electric wheel support (6), a brake oil cavity (2-2) is arranged in the brake shell (2-1), the brake piston (2-5) is arranged in the brake oil cavity (2-2), an accommodating cavity (2-3) is arranged between the brake piston (2-5) and the brake shell (2-1), the elastic part is arranged in the accommodating cavity (2-3), the friction plate group (2-6) is arranged between the brake piston (2-5) and a drive plate (20) of the mining dump truck, when hydraulic oil is introduced into the brake oil cavity (2-2), the elastic piece is in a compressed state, meanwhile, the friction plate sets (2-6) are in a disengaged state, when the hydraulic oil pressure in the brake oil cavity (2-2) is reduced, the elastic piece drives the brake piston (2-5) to move towards the friction plate sets (2-6), and meanwhile, the friction plate sets (2-6) are combined with each other.

2. The rear braking system of the electric-wheel mining dump truck according to claim 1, characterized in that: traction motor (1) and brake housing (2-1) all set up on the rear axle housing through electronic round of support (6) is fixed, the periphery at electronic round of support (6) is established in brake housing (2-1), brake housing (2-1) is passed to traction motor's (1) output.

3. The rear braking system of the electric-wheel mining dump truck according to claim 1 or 2, characterized in that: the rear braking system of the mining dump truck with the electric wheels further comprises a braking resistor or an energy recovery device (7), and the converter (4) is electrically connected between the traction motor (1) and the braking resistor or the energy recovery device (7).

4. The rear braking system of the electric-wheel mining dump truck according to claim 1 or 2, characterized in that: a piston sealing element (2-7) is arranged between the brake piston (2-5) and the brake housing (2-1), a small rotary sealing element (2-8) is arranged between the brake housing (2-1) and the driving disc (20), and a large rotary sealing element (2-9) is arranged between the electric wheel support (6) and the driving disc (20).

5. The rear braking system of the electric-wheel mining dump truck according to claim 1 or 2, characterized in that: the elastic part is a spring (2-4).

6. The rear braking system of the electric-wheel mining dump truck according to claim 1 or 2, characterized in that: the friction plate set (2-6) comprises a plurality of dynamic friction plates and static friction plates which are sequentially arranged along the axial direction of the hub (5) at intervals, and the dynamic friction plates are fixedly arranged on the driving disc (20).

7. The rear braking system of the electric-wheel mining dump truck according to claim 3, characterized in that: the rear brake system of the mining dump truck with the electric wheels further comprises a vehicle controller (8), an electric brake pedal (9) and a hydraulic brake pedal (10), wherein the electric brake pedal (9), a converter (4) and a brake resistor or energy recovery device (7) are electrically connected with the vehicle controller (8), and the vehicle controller (8) further receives a rotating speed signal of a hub (5); a pedal valve (11) and an electromagnetic valve (12) are sequentially arranged between the hydraulic brake pedal (10) and the brake oil cavity (2-2), the pedal valve (11) and the electromagnetic valve (12) are both connected with pressure oil and an oil tank, and the electromagnetic valve (12) is electrically connected with a vehicle controller (8).

8. The rear braking system of the electric-wheel mining dump truck according to claim 7, characterized in that: the electric brake pedal (9) and the hydraulic brake pedal (10) are independently arranged, or the electric brake pedal (9) and the hydraulic brake pedal (10) are two-in-one pedals, the front part of the pedal, which is stepped down, is the electric brake pedal (9), and the rear part of the pedal, which is stepped down, is the hydraulic brake pedal (10).

9. The rear braking system of the electric-wheel mining dump truck according to claim 7, characterized in that: the rear braking system of the mining dump truck with the electric wheels further comprises an emergency braking button (15) and a parking braking switch (16), wherein the emergency braking button (15) is electrically connected with the vehicle controller (8).

10. The rear braking system of the electric-wheel mining dump truck according to claim 9, characterized in that: the rear brake system of the mining dump truck with the electric wheels further comprises a first pressure sensor (17) and a second pressure sensor (18) which are electrically connected with the vehicle controller (8), the first pressure sensor (17) is arranged in an oil path leading to the brake oil cavity (2-2), the second pressure sensor (18) is arranged in a hydraulic brake oil path connected with the pedal valve (11), and a one-way valve (19) is arranged between the second pressure sensor (18) and the pedal valve (11).

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