Braking system of remote-controlled loader

Abstract

The present invention relates to the technical field of engineering machinery braking, and more particularly to a braking system for a remote-controlled loader, comprising an air storage cylinder, a service brake system comprising a first control valve and a foot brake valve, the air outlet of the air storage cylinder being connected to the air inlet of the first control valve and the air inlet of the foot brake valve, respectively, the air outlet of the first control valve being connected to a booster pump assembly and the air outlet of the foot brake valve, respectively, the booster pump assembly being connected to the brake caliper of a drive axle; the first control valve being configured to, under a first service braking condition, direct gas at the air inlet of the first control valve to the booster pump assembly via the air outlet of the first control valve; and under a second service braking condition, the first control valve being configured to direct gas at the air inlet of the foot brake valve to the booster pump assembly via the air outlet of the first control valve. A new air path is added within the first control valve of the service brake system, and the gas passing through the foot brake valve reaches the booster pump assembly after passing through the new air path within the first control valve, thereby reducing the number of valve bodies in the system.

Description

Technical Field

[0001] The present invention relates to the technical field of engineering machinery braking, and in particular to a braking system of a remote-controlled loader. Background Art

[0002] In the field of engineering machinery technology, unmanned and intelligent operation has become the forefront of the industry's development direction, and remote-controlled loaders are representative products of this industry transformation. As a key system for loader driving safety, the safety and reliability of the braking system are particularly important in the process of achieving unmanned and intelligent operation. In the event of a failure in the unmanned control system, the braking system should retain the function of manual operation. To this end, Chinese patent publication number CN112026724A proposes a jointly controllable loader braking system. However, this system has the following defects:

[0003] 1. After passing through the foot brake valve or solenoid valve, compressed air must also pass through a shuttle valve before reaching the booster pump assembly. The large number of valves used in the pipeline makes assembly and maintenance of the brake system inconvenient. Furthermore, the increased number of hoses increases the likelihood of system failure.

[0004] 2. When the electrical signal connects to the solenoid valve, the air pressure in the air tank is directly transmitted to the booster pump assembly to perform service braking, meaning that every braking action is a "sudden stop." When the loader is transporting or unloading, sudden braking increases the risk of the entire machine tipping over and also reduces the service life of the drive system.

[0005] 3. The parking brake's manual brake valve and solenoid valve are connected in series. If the control system fails and the solenoid valve fails to operate properly, the parking brake cannot be manually released. The control system must be repaired before the entire machine can be moved, which makes transporting and repairing the faulty machine inconvenient and may occupy the working space of other vehicles. Summary of the Invention

[0006] In order to overcome the shortcomings of the above-mentioned prior art, the present invention provides a braking system for a remote-controlled loader, in which a new air circuit is added to the first control valve of the service brake system. The gas passing through the foot brake valve reaches the booster pump group after passing through the new air circuit in the first control valve, thereby reducing the number of valve bodies in the system; the first control valve adopts a proportional solenoid valve, which can control the gas pressure at the outlet in direct proportion to the input current, and the operator can complete functions such as braking and emergency braking through a handle or other means; in addition, the manual brake valve and the second control valve are connected in parallel in the parking brake system, and both methods can release the parking brake.

[0007] The present invention is achieved through the following technical solutions: a brake system for a remote-controlled loader, comprising an air storage cylinder, the air outlet of which is respectively connected to a service brake system and a parking brake system;

[0008] The service brake system includes a first control valve and a foot brake valve, the air outlet of the air storage cylinder is connected to the air inlet of the first control valve and the air inlet of the foot brake valve respectively, the air outlet of the first control valve is connected to the booster pump group and the air outlet of the foot brake valve respectively, and the booster pump group is connected to the brake caliper of the drive axle;

[0009] The first control valve is configured to guide the gas at the air inlet of the first control valve to the booster pump group through the air outlet of the first control valve under the first service braking condition;

[0010] The first control valve is configured to guide the gas at the air inlet of the foot brake valve to the booster pump group through the air outlet of the first control valve under the second service braking condition.

[0011] In some embodiments, the first control valve and the foot brake valve are both provided with exhaust ports;

[0012] When the service brake is released, the gas in the booster pump group is led to the exhaust port of the first control valve through the outlet of the first control valve, or the gas in the booster pump group is led to the exhaust port of the foot brake valve through the outlet of the first control valve and the outlet of the foot brake valve in sequence.

[0013] In some embodiments, a control port is provided on the first control valve, and the air outlet of the first control valve is connected to the air outlet of the foot brake valve via the control port of the first control valve.

[0014] In some embodiments, under a first service braking condition, the first control valve is in an energized state;

[0015] Under the second service braking condition, the first control valve is in a power-off state and the air inlet of the foot brake valve and the air outlet of the foot brake valve are in a conducting state.

[0016] In some embodiments, the first control valve is a proportional solenoid valve.

[0017] In some embodiments, the parking brake system includes a second control valve and a manual brake valve, the air outlet of the air reservoir cylinder is connected to the air inlet of the second control valve and the air inlet of the manual brake valve, respectively, and the air outlet of the second control valve is connected to the air outlet of the brake cylinder and the manual brake valve, respectively;

[0018] The second control valve and the manual brake valve are both provided with an exhaust port;

[0019] During parking brake, the brake cylinder is connected to the exhaust port of the second control valve through the outlet of the second control valve, or the brake cylinder is connected to the exhaust port of the manual brake valve through the outlet of the second control valve, the outlet of the manual brake valve and the exhaust port of the manual brake valve in sequence.

[0020] In some embodiments, the second control valve is configured to, under a first parking brake release condition, direct gas at an air inlet of the second control valve to the brake cylinder via an air outlet of the second control valve;

[0021] The second control valve is configured to guide the gas at the air inlet of the manual brake valve to the brake cylinder through the air outlet of the second control valve under the second parking brake release working condition.

[0022] In some embodiments, a control port is provided on the second control valve, and an air outlet of the second control valve is connected to an air outlet of the manual brake valve via the control port of the second control valve.

[0023] In some embodiments, in a first parking brake release operating condition, the second control valve is in an energized state;

[0024] In the second parking brake release operating condition, the second control valve is in a power-off state and the air inlet of the manual brake valve and the air outlet of the manual brake valve are in a conducting state.

[0025] In some embodiments, the second control valve is a solenoid valve.

[0026] The beneficial effects of the present invention are: 1. The first control valve is equipped with a new vent, which not only realizes the function of controlling itself but also can realize the function of transmitting compressed gas; it reduces the number of valve bodies and hoses in the brake system, and reduces the difficulty of assembly and maintenance.

[0027] 2. The first control valve can control the outlet air pressure in direct proportion to the input current. The unmanned control system can also realize the braking and emergency braking functions of the traditional foot brake valve, improving the adaptability and safety of the remote control loader and extending its service life.

[0028] 3. The manual brake valve and the second control valve of the parking brake are connected in parallel. When the second control valve fails to work properly, the parking brake can also be released through the manual brake valve, which increases the flexibility of transporting the whole machine in case of failure and improves the maintainability of the loader. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the present invention;

[0030] Figure 2 This is a control implementation of the first control valve of the present invention;

[0031] Figure 3 This is another control implementation of the first control valve of the present invention;

[0032] In the figure, 1. air compressor, 2. multi-function unloading valve, 3. air storage cylinder, 4. foot brake valve, 5. first control valve, 6. booster pump group, 7. oil cup group, 8. drive axle, 9. manual brake valve, 10. second control valve, 11. brake cylinder, 12. selection valve, 12-1, float, 13. air valve, 13-1, spring block. DETAILED DESCRIPTION

[0033] The present invention will be further described below with reference to the accompanying drawings and examples.

[0034] like Figure 1 As shown, a braking system for a remote-controlled loader includes an air compressor 1, a multifunctional unloading valve 2, and an air storage cylinder 3. Air compressor 1, driven by an engine or electricity, compresses atmospheric air. The compressed air enters the multifunctional unloading valve 2 from the exhaust port of air compressor 1. The multifunctional unloading valve 2 includes an oil-water separator and an air pressure regulator. The multifunctional unloading valve 2 removes oil, water, and some impurities from the air. The separated gas passes through the air pressure regulator and is stored in the air storage cylinder 3. The outlet of the air storage cylinder 3 is connected to the service brake system and the parking brake system, respectively.

[0035] The service brake system includes a first control valve 5 and a foot brake valve 4. In some embodiments, the first control valve 5 includes an air inlet A5, a control port B5, an air outlet L5, and an exhaust port P5, and the foot brake valve 4 includes an air inlet A4, an air outlet L4, and an exhaust port P4. The air outlet of the air storage cylinder 3 is respectively connected to the air inlet A5 of the first control valve 5 and the air inlet A4 of the foot brake valve 4, and the air outlet L5 of the first control valve 5 is respectively connected to the booster pump group 6 and the air outlet L4 of the foot brake valve 4. Specifically, the air outlet L5 of the first control valve 5 is connected to the air outlet L4 of the foot brake valve 4 via the control port B5 of the first control valve 5. The booster pump group 6 is connected to the brake caliper of the drive axle 8.

[0036] The first control valve 5 is configured to guide the gas at the air inlet A5 of the first control valve 5 to the booster pump group 6 through the air outlet L5 of the first control valve 5 under the first service braking condition;

[0037] The first control valve 5 is configured to guide the gas at the air inlet A4 of the foot brake valve 4 to the booster pump assembly 6 through the air outlet L5 of the first control valve 5 under the second service braking condition.

[0038] When the service brake is released, the gas in the booster pump group 6 is led to the exhaust port of the first control valve 5 through the outlet of the first control valve 5, or the gas in the booster pump group 6 is led to the exhaust port of the foot brake valve 4 through the outlet of the first control valve 5 and the outlet of the foot brake valve 4 in sequence.

[0039] There are many options for the control structure of the first control valve 5 that can achieve the above functions.

[0040] In some embodiments, the first control valve 5 includes the following Figure 2 In the control structure of the selector valve 12 shown, port M4 is connected to control port B5 of the first control valve 5, and port M5 is connected to the inlet port A5 and exhaust port P5 of the first control valve 5, respectively. The flow between the inlet port A5 of the first control valve 5 and port M5, and between the exhaust port P5 of the first control valve 5 and port M5, is determined by the position of the valve core of the first control valve 5. Similarly, the flow between the outlet port L4 of the foot brake valve 4 and the inlet port A4, and between the outlet port L4 of the foot brake valve 4 and the exhaust port P4 of the foot brake valve 4, is also determined by the position of the valve core of the foot brake valve 4.

[0041] Under the first service braking condition, the valve core of first control valve 5 is controlled to connect its inlet port A5 to port M5. Air entering through inlet port A5 of first control valve 5 is input through port M5, pushing float 12-1 in selector valve 12 toward port M4, connecting its outlet port L5 to inlet port A5. The passage between outlet port L5 of first control valve 5 and control port B5 of first control valve 5 is blocked by float 12-1. Air at inlet port A5 of first control valve 5 passes through outlet L5 of first control valve 5 to booster pump assembly 6, which converts air pressure into hydraulic pressure, pushing brake fluid in oil cup assembly 7 to the brake caliper of drive axle 8, thus achieving service braking.

[0042] Under the second service braking condition, the exhaust port P5 of the first control valve 5 is controlled to be connected to the M5 port and the air outlet L4 of the foot brake valve 4 is controlled to be connected to the air inlet A4 of the foot brake valve 4. The air entering from the air inlet A4 of the foot brake valve 4 passes through the air outlet L4 of the foot brake valve 4 and the control port B5 of the first control valve 5 in sequence and is input from the M4 port, pushing the float 12-1 in the selection valve 12 to move toward the M5 port, so that the channel between the exhaust port P5 of the first control valve 5 and the air outlet L5 of the first control valve 5 is closed by the float 12-1, and the air inlet A4 of the foot brake valve 4 is connected to the air outlet L5 of the first control valve 5. The air at the air inlet A4 of the foot brake valve 4 passes through the air outlet L4 of the foot brake valve 4, the control port B5 of the first control valve 5, the M4 port, and the air outlet L5 of the first control valve 5 to reach the booster pump group 6. The booster pump group 6 converts the air pressure into hydraulic pressure, and pushes the brake fluid in the oil cup group 7 to the brake caliper of the drive axle 8 to complete the service braking.

[0043] In the first embodiment described above, when the service brakes need to be released, the exhaust port P5 of the first control valve 5 is controlled to be in communication with the port M5, and the air outlet L4 of the foot brake valve 4 is controlled to be in communication with the air outlet P4 of the foot brake valve 4. At this time, the exhaust path varies depending on the position of the float 12-1. For example, in the first service brake operating condition, if the float 12-1 blocks the port M4, then when the service brakes are released, the gas within the booster pump assembly 6 is directed through the air outlets L5 and M5 of the first control valve 5 to the exhaust port P5 of the first control valve 5. If the float 12-1 blocks the port M5, then when the service brakes are released, the gas within the booster pump assembly 6 is directed through the air outlets L5 of the first control valve 5, the port M4, and the air outlet L4 of the foot brake valve 4 to the exhaust port P4 of the foot brake valve 4.

[0044] In addition to the above embodiment, the present invention also provides a second embodiment. In the second embodiment, the first control valve 5 includes the following Figure 3 In the control structure of the air valve 13 shown, port N5 is connected to the air inlet A5 of the first control valve 5, port N4 is connected to the control port B5 of the first control valve 5, port N3 is connected to the exhaust port P5 of the first control valve 5, and port N2 is connected to the air outlet L5 of the first control valve 5. Under the above structure, the communication between the air outlet L4 of the foot brake valve 4 and the air inlet A4 of the foot brake valve 4 and the communication between the air outlet L4 of the foot brake valve 4 and the exhaust port P4 of the foot brake valve 4 are also determined by the position of the valve core of the foot brake valve 4. In addition, the foot brake valve 4 must also include a working position in which the air outlet L4 of the foot brake valve 4 is neither connected to the air inlet A4 of the foot brake valve 4 nor to the exhaust port P4 of the foot brake valve 4.

[0045] In the second embodiment described above, under the first service braking condition, the valve core of the first control valve 5 is controlled so that the air inlet A5 of the first control valve 5 is in communication with the port N5. At this time, the air outlet L4 of the foot brake valve 4 is neither in communication with the air inlet A4 nor with the air outlet P4 of the foot brake valve 4. Air entering from the air inlet A5 of the first control valve 5 is introduced through the port N5, pushing the spring block 13-1 within the air valve 13 toward the port N2, overcoming the spring's resistance. This causes the air outlet L5 of the first control valve 5 to be in communication with the air inlet A5 of the first control valve 5. Air at the air inlet A5 of the first control valve 5 passes sequentially through the ports N5, N2, and finally the air outlet L5 of the first control valve 5 to the booster pump assembly 6. The booster pump assembly 6 converts the air pressure into hydraulic pressure, pushing the brake fluid in the oil cup assembly 7 to the brake caliper of the drive axle 8, thereby achieving service braking.

[0046] Under the second service braking condition, the air outlet A5 of the first control valve 5 is disconnected from the N5 port, and the air outlet L4 of the foot brake valve 4 is connected to the air inlet A4 of the foot brake valve 4. Air entering from the air inlet A4 of the foot brake valve 4 passes through the air outlet L4 of the foot brake valve 4, the control port B5 of the first control valve 5, and finally enters the N4 port. This pushes the spring block 13-1 in the air valve 13 to overcome the spring resistance and move toward the N2 port, thus connecting the air outlet L4 of the foot brake valve 4 to the air outlet L5 of the first control valve 5. The air at the air inlet A4 of the foot brake valve 4 passes through the air outlet L4 of the foot brake valve 4, the control port B5 of the first control valve 5, the N4 port, the N2 port, and the air outlet L5 of the first control valve 5, and reaches the booster pump assembly 6. The booster pump assembly 6 converts the air pressure into hydraulic pressure, pushing the brake fluid in the oil cup assembly 7 to the brake caliper of the drive axle 8, thus achieving service braking.

[0047] In the above-mentioned second embodiment, when the service brake needs to be released, the air inlet A5 of the first control valve 5 is controlled to be disconnected from the N5 port and the air inlet A4 of the foot brake valve 4 is controlled to be disconnected from the N4 port. Since the air outlet L5 of the first control valve 5 is in a normally conductive state via the N2 port and the N3 port and the exhaust port P5 of the first control valve 5, when the service brake is released, the gas in the booster pump group 6 is led to the exhaust port P5 of the first control valve 5 via the air outlet L5, the N2 port and the N3 port of the first control valve 5.

[0048] In some embodiments, the first control valve 5 is a proportional solenoid valve that can be remotely controlled. Under the first service braking condition, the first control valve 5 is in an energized state, and the air inlet A5 of the first control valve 5 is connected to the air outlet L5 of the first control valve 5.

[0049] Under the second service braking condition, the first control valve 5 is in a de-energized state (the air inlet A5 of the first control valve 5 and the air outlet L5 of the first control valve 5 are in a disconnected state) and the air inlet of the foot brake valve 4 and the air outlet of the foot brake valve 4 are in a connected state.

[0050] This embodiment uses a remote control handle as an example to illustrate how to control current input. When using the handle, the current input to the first control valve 5 is proportionally controlled based on the amplitude of the handle's joystick movement. Based on the input current, the first control valve 5 controls the pressure of the gas passing through it. When the maximum current is reached, the compressed gas pressure within the gas reservoir 3 is fully transferred to the booster pump assembly 6. The operator can use the handle to perform functions such as braking and emergency braking.

[0051] When the foot brake valve 4 is used for service braking, the operator controls the gas pressure passing through the foot brake valve 4 in direct proportion to the amplitude of the foot brake pedal being depressed, thereby completing proportional control.

[0052] During service braking, the operator can either control the first control valve 5 through an electrical signal to complete service braking, or operate the foot brake valve 4 to complete service braking.

[0053] In some embodiments, the parking brake system includes a second control valve 10 and a manual brake valve 9, the second control valve 10 includes an air inlet A10, an air outlet L10, a control port B10 and an exhaust port P10, and the manual brake valve 9 includes an air inlet A9, an air outlet L9 and an exhaust port P9.

[0054] The air outlet of the air storage cylinder 3 is respectively connected to the air inlet A10 of the second control valve 10 and the air inlet A9 of the manual brake valve 9, and the air outlet L10 of the second control valve 10 is respectively connected to the brake cylinder 11 and the air outlet L9 of the manual brake valve 9; the air outlet L10 of the second control valve 10 is connected to the air outlet L9 of the manual brake valve 9 via the control port B10 of the second control valve 10.

[0055] During parking braking, the gas in the brake cylinder 11 is led to the exhaust port P10 of the second control valve 10 through the outlet L10 of the second control valve 10, or the gas in the brake cylinder 11 is led to the exhaust port P9 of the manual brake valve 9 through the outlet L10 of the second control valve 10 and the outlet L9 of the manual brake valve 9 in turn.

[0056] The second control valve 10 is configured to guide the gas at the air inlet A10 of the second control valve 10 to the brake cylinder 11 through the air outlet L10 of the second control valve 10 in the first parking brake release working condition;

[0057] The second control valve 10 is configured to guide the gas at the air inlet A9 of the manual brake valve 9 to the brake cylinder 11 through the air outlet L10 of the second control valve 10 under the second parking brake release condition.

[0058] The control structure of the second control valve 10 can be the same as the control structure of the first embodiment shown for the first control valve 5, or the same as the control structure of the second embodiment shown for the first control valve 5. Similarly, in the corresponding embodiment, the structure of the manual brake valve 9 is the same as the control structure of the corresponding foot brake valve 4.

[0059] For example, the second control valve 10 employs the same control structure as that of the first control valve 5 in the first embodiment. Port M4 of the selector valve 12 is connected to the control port B10 of the second control valve 10, while port M5 is connected to the air inlet A10 and exhaust port P10 of the second control valve 10, respectively. The flow between the air inlet A10 and port M5, and between the exhaust port P10 and port M5, of the second control valve 10 are determined by the position of the valve core of the second control valve 10. Similarly, the flow between the air outlet L9 of the manual brake valve 9 and its air inlet A9, and between the air outlet L9 and exhaust port P9, are also determined by the position of the valve core of the manual brake valve 9.

[0060] The second control valve 10 adopts Figure 2 Under the control structure of selector valve 12 shown, when parking brake application is required, the exhaust port P10 of second control valve 10 is connected to port M5, and the outlet port L9 of manual brake valve 9 is connected to the exhaust port P9 of manual brake valve 9. The exhaust path varies depending on the position of float 12-1. If float 12-1 blocks port M4, during parking brake application, the gas in brake cylinder 11 is directed through outlet ports L10 and M5 of second control valve 10 to exhaust port P10 of second control valve 10. If float 12-1 blocks port M5, during parking brake application, the gas in brake cylinder 11 is directed through outlet ports L10 of second control valve 10, port M4, and outlet port L9 of manual brake valve 9, sequentially to exhaust port P9 of manual brake valve 9.

[0061] The second control valve 10 adopts Figure 2 Under the control structure of the selector valve 12 shown, the principle of releasing the parking brake is as follows:

[0062] In the first parking brake release condition, the valve core of second control valve 10 is controlled to connect its air inlet A10 to port M5. Air entering through air inlet A10 of second control valve 10 is input through port M5, pushing float 12-1 in selector valve 12 toward port M4. This connects air outlet L10 of second control valve 10 to air inlet A10 of second control valve 10. The passage between air outlet L10 of second control valve 10 and control port B10 of second control valve 10 is blocked by float 12-1. Air at air inlet A10 of second control valve 10 passes through air outlet L10 of second control valve 10 and reaches brake cylinder 11. Brake cylinder 11 pushes the flexible shaft, releasing the parking brake caliper. The parking brake is released, allowing the loader to travel normally.

[0063] In the second parking brake release condition, the exhaust port P10 of the second control valve 10 is connected to the M5 port, and the outlet port L9 of the manual brake valve 9 is connected to the inlet port A9 of the manual brake valve 9. Air entering from the inlet port A9 of the manual brake valve 9 passes through the outlet port L9 of the manual brake valve 9, the control port B10 of the second control valve 10, and finally enters the M4 port. This pushes the float 12-1 in the selector valve 12 toward the M5 port, sealing the passage between the exhaust port P10 and the outlet port L10 of the second control valve 10. The air at the inlet port A9 of the manual brake valve 9 passes through the outlet port L10 of the second control valve 10 and reaches the brake cylinder 11. The brake cylinder 11 pushes the flexible shaft, releasing the parking brake caliper, releasing the parking brake, and allowing the loader to travel normally.

[0064] The second control valve 10 also uses the same control structure as the first control valve 5 in the second embodiment. However, during service braking, air is supplied to the booster pump assembly 6 via the first control valve 5, while when the service brake is released, the air in the booster pump assembly 6 is exhausted. During parking braking, the air in the brake cylinder 11 is exhausted, and when the parking brake is released, air is supplied to the brake cylinder 11 via the second control valve 10.

[0065] In some embodiments, the second control valve 10 is a solenoid valve and is electrically controlled. In the first parking brake release condition, the second control valve 10 is energized, and the air inlet A10 of the second control valve 10 is connected to the air outlet L10 of the second control valve 10.

[0066] In the second parking brake release condition, the second control valve 10 is in a de-energized state (the air inlet A10 of the second control valve 10 and the air outlet L10 of the second control valve 10 are in a disconnected state) and the air inlet A9 of the manual brake valve 9 and the air outlet L9 of the manual brake valve are in a connected state.

[0067] During parking, the operator can release the parking brake by either controlling the second control valve 10 with an electrical signal or by operating the manual brake valve 9. When the loader is in the parking brake state, the flexible shaft tightens the parking brake caliper. When air is supplied to the brake cylinder 11, it pushes the flexible shaft, releasing the parking brake caliper and releasing the parking brake, allowing the loader to travel normally.

[0068] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are within the scope of the technical solution of the present invention.

Claims

1. A braking system for a remote-controlled loader, characterized in that: It comprises an air storage cylinder (3), the air outlet of the air storage cylinder (3) being connected to the service brake system and the parking brake system respectively; The service brake system comprises a first control valve (5) and a foot brake valve (4), the air outlet of the air storage cylinder (3) is respectively connected to the air inlet of the first control valve (5) and the air inlet of the foot brake valve (4), the air outlet of the first control valve (5) is respectively connected to the air outlet of the booster pump group (6) and the air outlet of the foot brake valve (4), and the booster pump group (6) is connected to the brake caliper of the drive axle (8); The first control valve (5) is configured to guide the gas at the air inlet of the first control valve (5) to the booster pump group (6) through the air outlet of the first control valve (5) under the first service braking condition; The first control valve (5) is configured to guide the gas at the air inlet of the foot brake valve (4) to the booster pump group (6) through the air outlet of the first control valve (5) under the second service braking condition; The first control valve (5) and the foot brake valve (4) are both provided with exhaust ports; When the service brake is released, the gas in the booster pump group (6) is led to the exhaust port of the first control valve (5) through the outlet port of the first control valve (5), or the gas in the booster pump group (6) is led to the exhaust port of the foot brake valve (4) through the outlet port of the first control valve (5) and the outlet port of the foot brake valve (4) in sequence; The first control valve (5) is provided with a control port, and the air outlet of the first control valve (5) is connected to the air outlet of the foot brake valve (4) via the control port of the first control valve (5); The parking brake system comprises a second control valve (10) and a manual brake valve (9), the air outlet of the air storage cylinder (3) is connected to the air inlet of the second control valve (10) and the air inlet of the manual brake valve (9), and the air outlet of the second control valve (10) is connected to the air outlet of the brake cylinder (11) and the manual brake valve (9); The second control valve (10) and the manual brake valve (9) are both provided with exhaust ports; During parking braking, the brake cylinder (11) is connected to the exhaust port of the second control valve (10) via the outlet port of the second control valve (10), or the brake cylinder (11) is connected to the exhaust port of the manual brake valve (9) via the outlet port of the second control valve (10) and the outlet port of the manual brake valve (9) in sequence.

2. A braking system for a remote-controlled loader according to claim 1, characterized in that: In a first service braking condition, the first control valve (5) is in an energized state; In the second service braking condition, the first control valve (5) is in a power-off state and the air inlet of the foot brake valve (4) and the air outlet of the foot brake valve (4) are in a conducting state.

3. The braking system of a remote-controlled loader according to claim 2, characterized in that: The first control valve (5) is a proportional solenoid valve.

4. The braking system of a remote-controlled loader according to claim 1, characterized in that: The second control valve (10) is configured to guide the gas at the air inlet of the second control valve (10) to the brake cylinder (11) through the air outlet of the second control valve (10) under a first parking brake release working condition; The second control valve (10) is configured to guide the gas at the air inlet of the manual brake valve (9) to the brake cylinder (11) through the air outlet of the second control valve (10) under the second parking brake release working condition.

5. A braking system for a remote-controlled loader according to claim 1 or 4, characterized in that: The second control valve (10) is provided with a control port, and the air outlet of the second control valve (10) is connected to the air outlet of the manual brake valve (9) via the control port of the second control valve (10).

6. The braking system of a remote-controlled loader according to claim 1, characterized in that: In a first parking brake release operating condition, the second control valve (10) is in an energized state; In the second parking brake release operating condition, the second control valve (10) is in a power-off state and the air inlet of the manual brake valve (9) and the air outlet of the manual brake valve (9) are in a conducting state.

7. The braking system of a remote-controlled loader according to claim 6, characterized in that: The second control valve (10) is a solenoid valve.

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