Automatic parking brake for heavy-duty dump truck

Abstract

The present application relates to the technical field of parking brake, in particular to an automatic parking brake of heavy-duty unloading vehicle, which comprises a vehicle frame, a protection frame, a driving pressure frame and elastic pressure frames, the vehicle frame is connected with the heavy-duty unloading vehicle, a wheel shaft is rotatably connected to the vehicle frame, a single-chip microcomputer is fixedly installed on the vehicle frame, two pneumatic compensation components are installed between the vehicle frame and the protection frame, a group of elastic limit components are installed between the protection frame and the driving pressure frame, a group of electromagnets are installed on the bottom surface of the protection frame, and a magnetic attraction column is installed on the driving pressure frame and corresponds to the position of each electromagnet. The present application has the beneficial effect that when the displacement amplitude of the wheel in the braking state exceeds the set value, the protection frame moves up under the driving action of the auxiliary wheel assembly, and the brake caliper and the locking caliper lose the braking effect on the brake disc, so that the wheel in the braking state can lose the braking effect on the wheel in a controlled state after forced displacement of a specified amplitude, thereby achieving wear protection for the wheel.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of parking brake, in particular to an automatic parking brake of heavy unloading vehicle. BACKGROUND

[0002] Generally, when the vehicle is parked, the movement of the vehicle is restrained by operating the parking brake device.

[0003] In the prior art, the patent document with publication number CN103158683A discloses an electronic parking brake device, which comprises a brake caliper, a brake disc wrapped on a driving tire of a vehicle, a pad movably arranged on the brake disc and frictionally connected with the brake disc, a piston slidably arranged on the brake caliper and pressing the pad to the brake disc, a mandrel rotatably arranged on the brake caliper, a nut component slidably arranged on the brake caliper and threadedly combined with the mandrel, and an actuator providing power to the mandrel. The above-mentioned application can simplify the assembly of the brake device, reduce errors in the assembly process, and reduce noise in the driving of the brake device. However, the above-mentioned brake does not have the wear protection function when the wheel is forced to move or is strongly dragged. Therefore, the present application provides an automatic parking brake of heavy unloading vehicle to solve the problems in the above-mentioned background technology. SUMMARY

[0004] The present application provides an automatic parking brake of heavy unloading vehicle to solve the problem that the existing brake does not have the wear protection function when the wheel is forced to move or is strongly dragged.

[0005] The technical solution of the present application to solve the above-mentioned technical problems is as follows: an automatic parking brake of heavy unloading vehicle, comprising a vehicle frame, a protective frame, a driving pressure frame and an elastic pressure frame, wherein the vehicle frame is connected with the heavy unloading vehicle, a wheel shaft is rotatably connected to the vehicle frame, a single-chip microcomputer is fixedly installed on the vehicle frame, two pneumatic compensation components are installed between the vehicle frame and the protective frame, a set of elastic limiting components are installed between the protective frame and the driving pressure frame, a set of electromagnets are installed on the bottom surface of the protective frame, a magnetic attraction column is installed on the driving pressure frame corresponding to the position of each electromagnet, a set of elastic pressure components are installed between the driving pressure frame and the elastic pressure frame, a brake disc is provided on the wheel shaft, an electronic brake assembly and an electromagnetic brake assembly are respectively provided on the brake disc, two auxiliary wheel components are installed between the driving pressure frame and the vehicle frame, and the two auxiliary wheel components are respectively connected with the two pneumatic compensation components.

[0006] The present application has the following advantages:

[0007] 1) In the present application, when the displacement amplitude of the wheel in the braking state does not exceed the set amplitude, the spacing between the guard frame and the wheel frame is kept fixed under the action of the limiting spring, and when the displacement amplitude of the wheel in the braking state exceeds the set value, the guard frame moves up under the driving action of the auxiliary wheel part, and the brake caliper and the locking caliper lose the braking action on the brake disc, so that the wheel in the braking state can lose the braking action on the wheel in a controlled state after the specified amplitude of the forced displacement, thereby realizing the wear protection of the wheel.

[0008] 2) In the present application, when the wheel is braked, the auxiliary wheel is in close contact with the ground under the action of the telescopic pipe and the buffer spring, and when the wheel is forced to displace in a specified direction, the auxiliary wheel in the specified direction rotates, and after the auxiliary wheel in the specified direction rotates, the pump cylinder is driven to one-way gas supply to the inside of the intake cavity, and after the inside of the intake cavity is one-way gas supplied, the pneumatic compensation part is driven to work, and after the pneumatic compensation part works, the self-start of the wheel wear protection function is realized.

[0009] 3) In the present application, the rotation depth control of the pressure regulating column can adjust the exhaust pressure of the pressure boosting cylinder and the self-start threshold of the pneumatic compensation part working or the wheel anti-wear function, thereby effectively improving the flexibility and easy adjustability of the brake in use.

[0010] On the basis of the above technical scheme, the present application can also be improved as follows.

[0011] Further, the elastic limiting part comprises a T-shaped guide rod fixed on the driving pressure frame, the T-shaped guide rod is in sliding connection with the guard frame, and a compression-resistant spring is sleeved on the T-shaped guide rod and corresponds to the position between the guard frame and the driving pressure frame.

[0012] The beneficial effects of the above further scheme are that when the electromagnet is in a charged state and generates a magnetic force, the electromagnet and the magnetic attraction column are in close proximity, the spacing between the guard frame and the driving pressure frame is kept to a minimum after the electromagnet and the magnetic attraction column are in close proximity, and the compression-resistant spring is in a compressed state;

[0013] When the electromagnet is in a power-off state, the electromagnet loses power and loses the magnetic force, and under the action of the compression-resistant spring, the driving pressure frame moves down fully, and after the driving pressure frame moves down fully, the electromagnetic brake assembly is driven to work.

[0014] Further, the elastic pressure applying part comprises a T-shaped pressure rod fixedly connected with the elastic pressure frame, the T-shaped pressure rod is in sliding connection with the driving pressure frame, a pressure applying spring is sleeved on the T-shaped pressure rod and corresponds to the position between the driving pressure frame and the elastic pressure frame, the axis direction of the T-shaped pressure rod is the same as the axis direction of the T-shaped guide rod, and the axis direction of the T-shaped pressure rod is perpendicular to the axis direction of the wheel shaft.

[0015] The beneficial effect of the further scheme is that when the active pressing frame is fully lowered, the brake jaw in the electromagnetic brake assembly can be precisely clamped on the second tooth surface, thereby effectively braking and limiting the brake disc.

[0016] Further, the electronic brake assembly comprises a motor mounted on the frame, a brake pressing pipe in sliding connection with the frame, and a first tooth surface provided on the brake disc, the output shaft end of the motor is fixedly mounted with a transmission screw rod, the transmission screw rod is in transmission connection with the brake pressing pipe, the inner wall of the brake pressing pipe is in sliding connection with a locking jaw, a pressure compensation spring is mounted between the locking jaw and the brake pressing pipe, a speed sensor for monitoring the wheel shaft speed is fixedly mounted on the frame, and the data end of the speed sensor is in data connection with a single-chip microcomputer.

[0017] The beneficial effect of the further scheme is that during operation, the speed sensor is used to monitor the wheel shaft speed in real time, when the speed sensor monitors that the wheel shaft speed is zero, the motor automatically works, and finally the locking jaw is clamped on the first tooth surface, thereby precisely braking the brake disc, when the electromagnet is powered, the locking jaw is automatically reset to the initial state, thereby losing the braking effect on the brake disc.

[0018] Further, the electromagnetic brake assembly comprises a second tooth surface provided on the brake disc, the bottom surface of the elastic pressing frame is mounted with a brake jaw, and the bottom surface of the brake jaw is uniformly distributed with a group of regularly distributed locking teeth matched with the second tooth surface.

[0019] Further, the pneumatic compensation member comprises a pipe barrel fixedly connected with the frame, the inner wall of the pipe barrel is in sliding connection with a pneumatic rod, the bottom surface of the pneumatic rod and the pipe barrel are provided with an air inlet cavity, the air inlet cavities in the two pneumatic compensation members are communicated through an air pipe, a limiting spring is sleeved on the pneumatic rod and corresponds to the position inside the pipe barrel, the air inlet cavity is in communication with an auxiliary wheel component, and a pressure relief valve is communicated with the air inlet cavity.

[0020] The beneficial effect of the further scheme is that when the displacement amplitude of the wheel in the braking state does not exceed the set amplitude, the spacing between the guard frame and the wheel frame remains fixed under the action of the limiting spring, when the displacement amplitude of the wheel in the braking state exceeds the set value, the guard frame moves up under the driving action of the auxiliary wheel component, and the brake jaw and the locking jaw lose the braking effect on the brake disc, thereby making the wheel lose the braking effect on the wheel in a controlled state after the wheel is forcibly displaced by a specified amplitude in the braking state, thereby achieving wear protection of the wheel, when the wheel is in the normal working mode, the pressure relief valve is always open, and when the wheel is stationary, the pressure relief valve is always closed.

[0021] Further, the auxiliary wheel part comprises a pressing arm hinged to the frame, a telescopic pipe is hinged between the pressing arm and the elastic pressing frame, a buffer spring is sleeved on the telescopic section of the telescopic pipe, a vice wheel is rotatably connected to the bottom of the pressing arm, a pump cylinder is fixedly installed on the pressing arm, a one-way pump air assembly driven by the vice wheel is installed in the pump cylinder, a pressure increasing cylinder is fixedly communicated with the top surface of the pump cylinder, a valve seat is slidably connected to the inner wall of the pressure increasing cylinder, a pressure regulating column is threadedly connected to the top of the pressure increasing cylinder, a pressure providing spring is installed between the pressure regulating column and the valve seat, a soft connecting pipe is fixedly communicated with the pressure increasing cylinder, the two soft connecting pipes in the two auxiliary wheel parts are respectively fixedly communicated with the air inlet cavities in the two pneumatic compensation pieces, a one-way air outlet valve is fixedly installed on the soft connecting pipe, an electromagnetic air valve and an air pressure probe for monitoring the air pressure in the pressure increasing cylinder are installed on the pressure increasing cylinder, and the electromagnetic air valve and the air pressure probe are electrically connected with the single-chip microcomputer.

[0022] The beneficial effect of the above further scheme is that when the brake needs to have the wheel wear protection function, the electromagnetic air valve is closed, and the air pressure in the pressure increasing cylinder is not discharged; and when the brake does not need to have the wheel wear protection function, the electromagnetic air valve is opened, and the air pressure in the pressure increasing cylinder is discharged.

[0023] When the wheel is braked, the vice wheel is tightly attached to the ground under the action of the telescopic pipe and the buffer spring; after the vice wheel is tightly attached to the ground, when the wheel is forced to displace in a specified direction, the vice wheel in the specified direction rotates; after the vice wheel in the specified direction rotates, the pump cylinder is in turn driven to one-way feed air to the inside of the air inlet cavity; and after the inside of the air inlet cavity is one-way fed with air, the pneumatic compensation piece is in turn driven to work.

[0024] The exhaust pressure of the pressure increasing cylinder and the self-start threshold of the wheel wear protection function or the working of the pneumatic compensation piece can be adjusted through the rotating depth control of the pressure regulating column.

[0025] Further, the one-way pump air assembly comprises a pump shaft rotatably connected in the pump cylinder, a group of pump blades in a circumferential array are installed on the pump shaft and at positions corresponding to the inner side of the pump cylinder, a one-way air inlet valve is fixedly installed on the pump cylinder, the pump shaft is drivingly connected with the vice wheel through a chain belt, a one-way pinion is installed on the pump shaft, a one-way pawl cooperating with the one-way pinion is hinged to the pressing arm at a position adjacent to the one-way pinion, and a torsional spring is fixedly arranged at the hinged position of the one-way pawl and the pressing arm.

[0026] The beneficial effect of the above further scheme is that during work, the rotatable directions of the two pump shafts are different due to the arrangement of the one-way pawl, and during work, the pump shaft can only rotate in a specified direction under the action of the one-way pawl.

[0027] The one-way pawl has a tendency to automatically approach the one-way pinion due to the arrangement of the torsional spring, thereby realizing one-way self-locking of the rotating direction of the one-way pinion.

[0028] Further, the wheel shaft is fixedly installed with wheels, and two auxiliary wheel parts are arranged on two sides of the wheels respectively. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is a whole structure schematic diagram of the automatic parking brake of the heavy-duty unloading vehicle of the present application;

[0030] Figure 2 It is a whole structure schematic diagram of the heavy-duty unloading vehicle of the present application Figure 1 It is a local enlarged structure schematic diagram of A in the present application;

[0031] Figure 3 It is a local enlarged structure schematic diagram of B in the present application Figure 1 It is a local enlarged structure schematic diagram of B in the present application

[0032] Figure 4 It is a local enlarged structure schematic diagram of C in the present application Figure 1 It is a local enlarged structure schematic diagram of C in the present application

[0033] Figure 5 It is a structure schematic diagram of the first tooth surface and the second tooth surface of the present application;

[0034] Figure 6 It is a structure schematic diagram of the elastic limiting piece and the pump cylinder of the present application;

[0035] Figure 7 It is a cross-sectional structure schematic diagram of the present application Figure 6 It is a cross-sectional structure schematic diagram of the present application

[0036] Figure 8 It is a local enlarged structure schematic diagram of D in the present application Figure 7 It is a local enlarged structure schematic diagram of D in the present application

[0037] Figure 9 It is a cross-sectional structure schematic diagram of the brake pressure pipe and the transmission screw rod of the present application;

[0038] Figure 10 It is a cross-sectional structure schematic diagram of the pump cylinder and the valve seat of the present application.

[0039] In the drawings, the component list represented by each sign is as follows:

[0040] 1. Frame; 2. Protective frame; 3. Active pressure frame; 4. Elastic pressure frame; 5. Wheel axle; 6. Microcontroller; 7. Elastic limiting component; 8. Electromagnet; 9. Magnetic column; 10. Elastic pressure application component; 11. Brake disc; 12. Motor; 13. Brake pressure tube; 14. First tooth surface; 15. Drive screw; 16. Caliper; 17. Compensating spring; 18. Speed ​​sensor; 19. Second tooth surface; 20. Brake caliper; 21. Locking tooth; 22. Tube; 23. Pneumatic rod; 24. Limiting spring; 25. Pressure arm; 26. Telescopic tube; 27. Pressure relief spring; 28. Auxiliary wheel; 29. ​​Pump cylinder; 30. Pressure boosting cylinder; 31. Valve seat; 32. Pressure regulating column; 33. Pressure supply spring; 34. Flexible connecting tube; 35. One-way air outlet valve; 36. Solenoid valve; 37. Air pressure probe; 38. Pump shaft; 39. Pump impeller; 40. One-way air inlet valve; 41. One-way chuck; 42. One-way chuck claw; 43. Wheel. Detailed Implementation

[0041] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0042] The present invention provides the following preferred embodiments.

[0043] like Figures 1-10 As shown, an automatic parking brake for a heavy-duty unloading vehicle includes a frame 1, a guard frame 2, an active pressure frame 3, and an elastic pressure frame 4. The frame 1 is connected to the heavy-duty unloading vehicle.

[0044] A wheel axle 5 is rotatably connected to the frame 1, and a wheel 43 is fixedly mounted on the wheel axle 5;

[0045] A microcontroller 6 is fixedly mounted on the frame 1, and two pneumatic compensators are installed between the frame 1 and the guard frame 2.

[0046] The pneumatic compensator includes a tube 22 fixedly connected to the frame 1. A pneumatic rod 23 is slidably connected to the inner wall of the tube 22. An air intake chamber is provided between the bottom surface of the pneumatic rod 23 and the tube 22. The air intake chambers of the two pneumatic compensators are connected through a vent pipe. A limit spring 24 is sleeved on the pneumatic rod 23 at a position corresponding to the inside of the tube 22. The air intake chamber is connected to the auxiliary wheel component. A pressure relief valve is connected to the air intake chamber.

[0047] When the displacement amplitude of the wheel 43 in the braking state does not exceed the set amplitude, the spacing between the guard frame 2 and the wheel frame is kept fixed under the action of the limiting spring 24, and when the displacement amplitude of the wheel 43 in the braking state exceeds the set value, the guard frame 2 moves up under the driving action of the auxiliary wheel component, and the brake caliper 20 and the locking caliper 16 lose the braking action on the brake disc 11, so that the wheel 43 can lose the braking action on the wheel 43 in a controlled state after the wheel 43 is forced to displace a specified amplitude in the braking state, thereby achieving wear protection of the wheel 43, and when the wheel 43 is in the normal working mode, the pressure relief valve is always open, and when the wheel 43 is stationary, the pressure relief valve is always closed;

[0048] A set of elastic limiting members 7 are installed between the guard frame 2 and the active pressure frame 3.

[0049] The elastic limiting member 7 includes a T-shaped guide rod fixed to the active pressure frame 3, the T-shaped guide rod is in sliding connection with the guard frame 2, and a compression-resistant spring is sleeved on the T-shaped guide rod and corresponds to the position between the guard frame 2 and the active pressure frame 3.

[0050] When the electromagnet 8 is in the charged state and generates a magnetic force, the electromagnet 8 is close to the magnetic attraction column 9, and after the electromagnet 8 is close to the magnetic attraction column 9, the spacing between the guard frame 2 and the active pressure frame 3 is kept to be minimum, and the compression-resistant spring is in a compressed state;

[0051] When the electromagnet 8 is in the de-energized state, the electromagnet 8 loses the magnetic force after being de-energized, and under the action of the compression-resistant spring, the active pressure frame 3 moves downward, and after the active pressure frame 3 moves downward, the electromagnetic brake assembly is driven to work.

[0052] A set of electromagnets 8 are installed on the bottom surface of the guard frame 2, and a magnetic attraction column 9 is installed on the active pressure frame 3 and corresponds to the position of each electromagnet 8;

[0053] The magnetic attraction column 9 is made of iron;

[0054] The electromagnet 8 generates a magnetic property when energized and loses the magnetic property when de-energized;

[0055] A set of elastic pressure applying members 10 are installed between the active pressure frame 3 and the elastic pressure frame 4.

[0056] The elastic pressure applying member 10 includes a T-shaped pressure rod fixedly connected with the elastic pressure frame 4, the T-shaped pressure rod is in sliding connection with the active pressure frame 3, a pressure spring is sleeved on the T-shaped pressure rod and corresponds to the position between the active pressure frame 3 and the elastic pressure frame 4, the axis direction of the T-shaped pressure rod is the same as the axis direction of the T-shaped guide rod, and the axis direction of the T-shaped pressure rod is perpendicular to the axis direction of the wheel shaft 5.

[0057] When the active pressure frame 3 moves downward, the brake caliper 20 in the electromagnetic brake assembly can be accurately clamped into the second tooth surface 19 through the setting of the elastic pressure applying member 10, and then the brake disc 11 is effectively braked and limited.

[0058] The axle 5 is provided with a brake disc 11, and an electronic brake assembly and an electromagnetic brake assembly are respectively arranged on the brake disc 11. Two auxiliary wheel components are arranged between the driving press frame 3 and the vehicle frame 1, and the two auxiliary wheel components are respectively connected with two pneumatic compensation components.

[0059] The two auxiliary wheel components are respectively arranged on two sides of the wheel 43.

[0060] The electronic brake assembly comprises a motor 12 arranged on the vehicle frame 1, a brake press pipe 13 in sliding connection with the vehicle frame 1, and a first tooth surface 14 arranged on the brake disc 11. An output shaft end of the motor 12 is fixedly arranged with a transmission screw rod 15, the transmission screw rod 15 is in transmission connection with the brake press pipe 13, the inner wall of the brake press pipe 13 is in sliding connection with a locking jaw 16, the locking jaw 16 and the brake press pipe 13 are arranged with a pressure compensation spring 17, the vehicle frame 1 is fixedly arranged with a speed sensor 18 for monitoring the rotating speed of the axle 5, and a data end of the speed sensor 18 is in data connection with a single-chip microcomputer 6.

[0061] In work, the speed sensor 18 is used for monitoring the rotating speed of the axle 5 in real time. When the speed sensor 18 monitors that the rotating speed of the axle 5 is zero, the motor 12 automatically works, and finally the locking jaw 16 is clamped into the first tooth surface 14, so that the brake disc 11 is accurately braked. When the electromagnet 8 is electrified, the locking jaw 16 is automatically reset to the initial state, so that the brake disc 11 loses the braking effect.

[0062] The electromagnetic brake assembly comprises a second tooth surface 19 arranged on the brake disc 11, and the bottom surface of the elastic press frame 4 is arranged with a brake jaw 20. The bottom surface of the brake jaw 20 is uniformly arranged with a group of regularly distributed locking teeth 21 matched with the second tooth surface 19.

[0063] The auxiliary wheel component comprises a press arm 25 hinged with the vehicle frame 1, a telescopic pipe 26 hinged between the press arm 25 and the elastic press frame 4, a pressure relief spring 27 sleeved on the telescopic section of the telescopic pipe 26, a sub-wheel 28 rotationally connected to the bottom of the press arm 25, a pump cylinder 29 fixedly arranged on the press arm 25, a one-way pump air assembly arranged in the pump cylinder 29 and driven by the sub-wheel 28, a pressure increasing cylinder 30 fixedly communicated with the top surface of the pump cylinder 29, a valve seat 31 in sliding connection with the inner wall of the pressure increasing cylinder 30, a pressure adjusting column 32 threadedly connected to the top of the pressure increasing cylinder 30, a pressure providing spring 33 arranged between the pressure adjusting column 32 and the valve seat 31, a soft connection pipe 34 fixedly communicated with the pressure increasing cylinder 30, two soft connection pipes 34 in two auxiliary wheel components respectively fixedly communicated with two air inlet cavities in two pneumatic compensation components, a one-way air outlet valve 35 fixedly arranged on the soft connection pipe 34, an electromagnetic air valve 36 and an air pressure probe 37 arranged on the pressure increasing cylinder 30 and monitoring the air pressure in the pressure increasing cylinder 30, and the electromagnetic air valve 36 and the air pressure probe 37 are both in electrical connection with the single-chip microcomputer 6.

[0064] When the brake device needs to have the wheel 43 anti-wear protection function, the electromagnetic air valve 36 is closed, and the air pressure in the pressure cylinder 30 is not discharged; when the brake device needs not to have the wheel 43 anti-wear function, the electromagnetic air valve 36 is opened, and the air pressure in the pressure cylinder 30 is discharged;

[0065] When the wheel 43 is braked, the auxiliary wheel 28 is in close contact with the ground under the action of the telescopic pipe 26 and the buffer spring 27; after the auxiliary wheel 28 is in close contact with the ground, when the wheel 43 is forced to displace in a specified direction, the auxiliary wheel 28 in the specified direction rotates, and after the auxiliary wheel 28 in the specified direction rotates, the pump cylinder 29 drives the air in the air inlet cavity to be unidirectionally sent to the inside, and after the inside of the air inlet cavity is unidirectionally sent, the pneumatic compensation member is driven to work;

[0066] The depth of the pressure regulating column 32 is controlled to adjust the exhaust pressure of the pressure cylinder 30 and the self-starting threshold of the pneumatic compensation member when working or the wheel 43 anti-wear function.

[0067] The unidirectional pump air assembly comprises a pump shaft 38 rotationally connected in the pump cylinder 29, a group of pump blades 39 arranged in a circumferential array and installed on the pump shaft 38 and corresponding to the position of the inner side of the pump cylinder 29, a unidirectional air inlet valve 40 fixedly installed on the pump cylinder 29, and the pump shaft 38 is drivingly connected with the auxiliary wheel 28 through a chain belt, a unidirectional pin wheel 41 is installed on the pump shaft 38, a unidirectional pin claw 42 matched with the unidirectional pin wheel 41 is hingedly connected to the position adjacent to the unidirectional pin wheel 41 on the pressure arm 25, and a torsional spring is fixedly arranged at the hinged connection between the unidirectional pin claw 42 and the pressure arm 25.

[0068] During work, the unidirectional pin claw 42 is arranged to make the rotatable directions of the two pump shafts 38 different, and during work, the pump shaft 38 can only rotate in a specified direction under the action of the unidirectional pin claw 42.

[0069] The torsional spring is arranged to make the unidirectional pin claw 42 have a tendency to automatically approach the unidirectional pin wheel 41, thereby realizing the unidirectional self-locking of the rotation direction of the unidirectional pin wheel 41.

[0070] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms “center”, “longitudinal”, “transverse”, “length”, “width”, “thickness”, “upper”, “lower”, “front”, “rear”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inner”, “outer”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential” are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0071] In addition, the terms "first", "second", etc. are used only for the purpose of description, and should not be understood as indicating or implying relative importance or a specific number of the technical features indicated. Thus, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0072] The above description is only the preferred embodiment of the present application, and is not used to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. An automatic parking brake of heavy-duty dump truck, comprising a frame (1), a guard frame (2), a main pressing frame (3) and an elastic pressing frame (4), the frame (1) is connected with the heavy-duty dump truck, a wheel shaft (5) is rotatably connected on the frame (1), a single-chip microcomputer (6) is fixedly installed on the frame (1), characterized in that, Two pneumatic compensators are installed between the frame (1) and the guard frame (2), a set of elastic limiters (7) are installed between the guard frame (2) and the active pressing frame (3), a set of electromagnets (8) are installed on the bottom surface of the guard frame (2), a magnetic attraction column (9) is installed on the active pressing frame (3) and corresponds to the position of each electromagnet (8), a set of elastic pressure applying members (10) are installed between the active pressing frame (3) and the elastic pressing frame (4), a brake disc (11) is arranged on the wheel shaft (5), an electronic brake assembly and an electromagnetic brake assembly are respectively arranged on the brake disc (11), two auxiliary wheel members are installed between the active pressing frame (3) and the frame (1), and the two auxiliary wheel members are connected with the two pneumatic compensators. The elastic limiter (7) comprises a T-shaped guide rod fixed on the active pressing frame (3), the T-shaped guide rod is in sliding connection with the guard frame (2), and a compression-resistant spring is sleeved on the T-shaped guide rod and corresponds to the position between the guard frame (2) and the active pressing frame (3). The elastic pressure applying member (10) comprises a T-shaped pressing rod fixedly connected with the elastic pressing frame (4), the T-shaped pressing rod is in sliding connection with the active pressing frame (3), a pressure applying spring is sleeved on the T-shaped pressing rod and corresponds to the position between the active pressing frame (3) and the elastic pressing frame (4), the axis direction of the T-shaped pressing rod is the same as the axis direction of the T-shaped guide rod, and the axis direction of the T-shaped pressing rod is perpendicular to the axis direction of the wheel shaft (5). The electronic brake assembly comprises a motor (12) installed on the frame (1), a brake pressing pipe (13) in sliding connection with the frame (1), and a first tooth surface (14) arranged on the brake disc (11), a transmission screw rod (15) is fixedly installed at the output shaft end of the motor (12), the transmission screw rod (15) is in transmission connection with the brake pressing pipe (13), a locking jaw (16) is in sliding connection with the inner wall of the brake pressing pipe (13), a pressure supplementing spring (17) is installed between the locking jaw (16) and the brake pressing pipe (13), a speed sensor (18) for monitoring the rotating speed of the wheel shaft (5) is fixedly installed on the frame (1), and a data end of the speed sensor (18) is in data connection with a single-chip microcomputer (6). The electromagnetic brake assembly comprises a second tooth surface (19) arranged on the brake disc (11), and a brake jaw (20) is installed on the bottom surface of the elastic pressing frame (4), a plurality of regularly distributed locking teeth (21) matched with the second tooth surface (19) are uniformly arranged on the bottom surface of the brake jaw (20). The pneumatic compensator comprises a pipe cylinder (22) fixedly connected with the frame (1), a pneumatic rod (23) in sliding connection with the inner wall of the pipe cylinder (22), an air inlet cavity arranged between the bottom surface of the pneumatic rod (23) and the pipe cylinder (22), air inlets in two pneumatic compensators are communicated through an air pipe, a limiting spring (24) is sleeved on the pneumatic rod (23) and corresponds to the position inside the pipe cylinder (22), the air inlet cavity is communicated with the auxiliary wheel member, and a pressure relief valve is communicated with the air inlet cavity.

2. A heavy-duty dump truck automatic parking brake according to claim 1, characterized in that The auxiliary wheel component comprises a pressing arm (25) hinged to the frame (1), a telescopic pipe (26) being hinged between the pressing arm (25) and the elastic pressing frame (4), a buffer spring (27) being sleeved on the telescopic section of the telescopic pipe (26), a sub-wheel (28) being rotatably connected to the bottom of the pressing arm (25), a pump cylinder (29) being fixedly installed on the pressing arm (25), a one-way pump assembly being installed in the pump cylinder (29) and driven by the sub-wheel (28), a pressure boosting cylinder (30) being fixedly communicated with the top surface of the pump cylinder (29), a valve seat (31) being slidably connected to the inner wall of the pressure boosting cylinder (30), a pressure regulating column (32) being threadedly connected to the top of the pressure boosting cylinder (30), a pressure providing spring (33) being installed between the pressure regulating column (32) and the valve seat (31), a soft connecting pipe (34) being fixedly communicated with the pressure boosting cylinder (30), the two soft connecting pipes (34) in the two auxiliary wheel components being respectively fixedly communicated with the air inlet cavities in the two pneumatic compensators, a one-way air outlet valve (35) being fixedly installed on the soft connecting pipe (34), an electromagnetic air valve (36) and an air pressure probe (37) for monitoring the air pressure in the pressure boosting cylinder (30) being installed on the pressure boosting cylinder (30), and the electromagnetic air valve (36) and the air pressure probe (37) being electrically connected with the single-chip microcomputer (6).

3. A heavy-duty dump truck automatic parking brake according to claim 2, wherein, The one-way pump assembly comprises a pump shaft (38) rotatably connected in the pump cylinder (29), a plurality of pump blades (39) being circumferentially arranged on the pump shaft (38) and corresponding to the position on the inner side of the pump cylinder (29), a one-way air inlet valve (40) being fixedly installed on the pump cylinder (29), the pump shaft (38) being drivingly connected with the sub-wheel (28) through a chain belt, a one-way pinion (41) being installed on the pump shaft (38), a one-way pawl (42) being hinged to the pressing arm (25) and matched with the one-way pinion (41) and located adjacent to the one-way pinion (41), and a torsional spring being fixedly arranged at the hinged position of the one-way pawl (42) and the pressing arm (25).

4. A heavy-duty dump truck automatic parking brake according to claim 3, wherein The wheel shaft (5) is fixedly installed with a wheel (43), and the two auxiliary wheel components are respectively arranged on the two sides of the wheel (43).

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