Brake device and hydraulic system

Abstract

The utility model relates to the technical field of mechanical braking, and provides a braking device and a hydraulic system. The braking device comprises an oil tank, a first oil supply pipeline and a first backflow pipeline. The first end of the first oil supply pipeline communicates with the oil tank, the first oil supply pipeline is provided with an electromagnetic ball valve, and the electromagnetic ball valve is used for switching between a first state and a second state; and in the second state, the hydraulic oil moves from the second end of the first oil supply pipeline to the first end of the first oil supply pipeline. The first end of the first backflow pipeline communicates with the oil tank, and when the electromagnetic ball valve is in the second state, the second end of the first backflow pipeline communicates with the electromagnetic ball valve through the electromagnetic reversing valve; a proportional overflow valve is arranged between the electromagnetic reversing valve and the oil tank, and the electromagnetic reversing valve is used for switching between a third state and a fourth state; in the third state, the outlet of the electromagnetic reversing valve is communicated with the oil tank; and in the fourth state, the outlet of the electromagnetic reversing valve is communicated with the proportional overflow valve. According to the utility model, the defect of inaccurate distribution of braking force in a hydraulic device in the prior art is overcome, and the braking device and the hydraulic system which can accurately control the braking force are realized, so that the braking requirements under different working conditions and speeds are met.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical braking, in particular to a braking device and a hydraulic system. Background Art

[0002] The demand for graded braking technology in cableways is mainly due to their special working environment and strict safety requirements. Cableways usually operate in rugged mountain environments and face complex and changeable road conditions and climatic conditions, such as steep slopes, undulating terrain, strong winds, rain and snow, etc. These environmental factors place extremely high demands on the braking performance of cableways.

[0003] Cableway brakes are hydraulically controlled, so a brake device and hydraulic system that can accurately control the braking force is needed to meet the braking requirements under different working conditions and speeds. However, the hydraulic system in the existing brake device has the problem of inaccurate braking force distribution. Utility Model Content

[0004] The utility model provides a brake device and a hydraulic system to solve the defect of inaccurate braking force distribution in the hydraulic device in the prior art, and realize a brake device and a hydraulic system that can accurately control the braking force, thereby meeting the braking requirements under different working conditions and speeds.

[0005] The utility model provides a hydraulic system, comprising an oil tank, a first oil supply pipeline and a first return pipeline. The first end of the first oil supply pipeline is connected to the oil tank, and the first oil supply pipeline is provided with a first gear pump and an electromagnetic ball valve in sequence from the first end to the second end thereof, and the electromagnetic ball valve is used to switch between a first state and a second state; in the first state, the hydraulic oil moves from the first end of the first oil supply pipeline to the direction of the second end of the first oil supply pipeline; in the second state, the hydraulic oil moves from the second end of the first oil supply pipeline to the direction of the first end of the first oil supply pipeline; the first end of the first return pipeline is connected to the oil tank, and when the electromagnetic ball valve is in the second state, the second end of the first return pipeline is connected to the electromagnetic ball valve through the electromagnetic reversing valve; a proportional relief valve is provided between the electromagnetic reversing valve and the oil tank, and the electromagnetic reversing valve is used to switch between a third state and a fourth state; in the third state, the outlet of the electromagnetic reversing valve is connected to the oil tank; in the fourth state, the outlet of the electromagnetic reversing valve is connected to the proportional relief valve.

[0006] According to a braking device provided by the utility model, an oil suction filter is provided between the first gear pump and the oil tank, and the oil suction filter is used to filter impurities in the oil tank; a high-pressure oil filter is provided between the first gear pump and the electromagnetic ball valve, and the high-pressure oil filter is used to filter impurities in the first gear pump.

[0007] According to a braking device provided by the utility model, the first end of the first return pipeline is connected to the oil tank through an oil return filter, and the oil return filter is used to prevent impurities from entering the interior of the oil tank.

[0008] According to a braking device provided by the utility model, a one-way valve is provided between the high-pressure oil filter and the electromagnetic ball valve; the hydraulic system also includes a second return line, a first end of the second return line is connected between the proportional overflow valve and the return oil filter, and a second end of the second return line is connected between the high-pressure oil filter and the one-way valve; the second return line is provided with an overflow valve, and the overflow valve is used to adjust the pressure of the first oil supply line. When the pressure of the first oil supply line is higher than the rated value, the hydraulic oil flows back to the oil tank through the overflow valve.

[0009] According to a braking device provided by the utility model, a first stop valve and a one-way throttle valve are sequentially arranged between the electromagnetic ball valve and the second end of the first oil supply pipeline, the first stop valve is used to control the on and off of the first oil supply pipeline; the one-way throttle valve is used to switch between a fifth state and a sixth state, in the fifth state, the one-way throttle valve is used to prevent the hydraulic oil from moving from the second end of the first oil supply pipeline toward the first stop valve; in the sixth state, the one-way throttle valve is used to control the speed at which the hydraulic oil moves from the second end of the first oil supply pipeline toward the first stop valve.

[0010] According to a braking device provided by the utility model, it also includes an accumulator, a first end of the accumulator is connected between the one-way valve and the electromagnetic ball valve, a second end of the accumulator is connected to the oil tank, a second stop valve is provided between the accumulator and the oil tank, and a first pressure gauge is provided between the accumulator and the first oil supply pipeline.

[0011] According to a braking device provided by the utility model, the oil tank is provided with a liquid level and liquid temperature meter, and the liquid level and liquid temperature meter is used to measure the oil amount and oil temperature inside the oil tank.

[0012] According to a braking device provided by the utility model, the oil tank is provided with an air filter, and the oil tank is exhausted through the air filter.

[0013] A braking device provided by the utility model also includes a second oil supply pipeline, a first end of the second oil supply pipeline is connected to the oil tank, the second oil supply pipeline is provided with a second gear pump, and the second gear pump is connected to a manual pump.

[0014] The utility model also provides a braking device, comprising a hydraulic system as described in any one of the above embodiments, a first high-speed brake and a second high-speed brake, wherein the first high-speed brake and the second high-speed brake are connected in parallel at the second end of the first oil supply pipeline.

[0015] In the utility model, when the load of the system is small, the electromagnetic ball valve can be switched to the second state, and the electromagnetic reversing valve can be switched to the third state. At this time, the electromagnetic reversing valve is directly connected to the oil tank, and direct pressure relief can be achieved through the electromagnetic reversing valve and the electromagnetic ball valve. When the load of the system is large, the electromagnetic ball valve can be switched to the second state, and the electromagnetic reversing valve can be switched to the fourth state. At this time, the electromagnetic reversing valve is connected to the oil tank through the proportional relief valve, and the proportional relief valve controls the conduction ratio of the hydraulic oil according to the size of the analog voltage signal, thereby achieving graded braking, greatly improving the control accuracy, and thus enabling the system to meet the braking requirements under different working conditions and speeds. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 It is a structural schematic diagram of the brake device provided by the utility model when the electromagnetic reversing valve is in the third state.

[0018] Figure 2 It is a structural schematic diagram of the brake device provided by the utility model when the electromagnetic reversing valve is in the fourth state.

[0019] : Illustration symbols: 1: oil suction filter; 2: motor; 3: coupling; 4: first gear pump; 5: high-pressure oil filter; 6: overflow valve; 7: one-way valve; 8: proportional overflow valve; 9: solenoid reversing valve; 10: solenoid ball valve; 11: first stop valve; 12: one-way throttle valve; 13: third high-pressure hose; 14: first high-speed gate; 15: second high-speed gate; 16: second pressure gauge; 17: second high-pressure hose; 18: second pressure measuring and exhaust joint; 19: pressure sensor; 20: accumulator; 21: first pressure gauge; 22: first high-pressure hose; 23: first pressure measuring and exhaust joint; 24: second stop valve; 25: manual pump; 26: first ball valve; 27: oil tank; 28: second ball valve; 29: air filter; 30: liquid level and temperature gauge; 31: return oil filter; 32: second gear pump. DETAILED DESCRIPTION

[0020] The following is a further detailed description of the implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0021] In the description of the embodiments of the present utility model, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present utility model. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0022] In the description of the embodiments of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.

[0023] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0024] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model embodiment. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0025] Combine the following Figure 1-Figure 2 The hydraulic system of the utility model is described as follows: A hydraulic system comprises an oil tank 27, a first oil supply pipeline and a first return pipeline. The first end of the first oil supply pipeline is connected to the oil tank 27, and the first oil supply pipeline is provided with a first gear pump 4 and an electromagnetic ball valve 10 in sequence from the first end to the second end thereof, and the electromagnetic ball valve 10 is used to switch between the first state and the second state; in the first state, the hydraulic oil moves from the first end of the first oil supply pipeline to the direction of the second end of the first oil supply pipeline; in the second state, the hydraulic oil moves from the second end of the first oil supply pipeline to the direction of the first end of the first oil supply pipeline; the first end of the first return pipeline is connected to the oil tank 27, and when the electromagnetic ball valve 10 is in the second state, the second end of the first return pipeline is connected to the electromagnetic ball valve 10 through the electromagnetic reversing valve 9; a proportional relief valve 8 is provided between the electromagnetic reversing valve 9 and the oil tank 27, and the electromagnetic reversing valve 9 is used to switch between the third state and the fourth state; in the third state, the outlet of the electromagnetic reversing valve 9 is connected to the oil tank 27; in the fourth state, the outlet of the electromagnetic reversing valve 9 is connected to the proportional relief valve 8.

[0026] In the above structure, when the load of the system is small, the electromagnetic ball valve 10 is switched to the second state, and the electromagnetic reversing valve 9 can be switched to the third state. At this time, the electromagnetic reversing valve 9 is directly connected to the oil tank 27, and direct pressure relief can be achieved through the electromagnetic reversing valve 9 and the electromagnetic ball valve 10. When the load of the system is large, the electromagnetic ball valve 10 can be switched to the second state, and the electromagnetic reversing valve 9 can be switched to the fourth state. At this time, the electromagnetic reversing valve 9 is connected to the oil tank 27 through the proportional relief valve 8, and the proportional relief valve 8 controls the conduction ratio of the hydraulic oil according to the size of the analog voltage signal, thereby realizing graded braking, greatly improving the control accuracy, and thus enabling the system to meet the braking requirements under different working conditions and speeds.

[0027] Specifically, the proportional relief valve 8 is controlled by an amplifier. The proportional relief valve 8 is composed of a main valve and a proportional regulating valve. The hydraulic oil enters the throttle port of the proportional regulating valve through the main valve and then flows back to the oil tank 27. The main valve adjusts the opening degree of the throttle port according to the control signal. When the throttle port is completely closed, the hydraulic oil cannot flow and the pressure in the hydraulic system will rise; when the throttle port is fully opened, the hydraulic oil can flow freely and the pressure in the hydraulic system will decrease. The proportional regulating valve adjusts the opening degree of its own throttle port according to the opening degree of the throttle port of the main valve, thereby achieving the purpose of controlling the hydraulic flow. The proportional regulating valve uses a hydraulic damper to adjust the opening speed of the throttle port, thereby achieving continuous regulation of the hydraulic flow. By changing the opening degree of the throttle port of the main valve and the throttle port of the proportional regulating valve, the proportional relief valve can achieve precise and adjustable control of the flow in the hydraulic system.

[0028] Reference Figure 1 or Figure 2 In some embodiments of the utility model, an oil suction filter 1 is provided between the first gear pump 4 and the oil tank 27, and the oil suction filter 1 is used to filter impurities in the oil tank 27; a high-pressure oil filter 5 is provided between the first gear pump 4 and the electromagnetic ball valve 10, and the high-pressure oil filter 5 is used to filter impurities in the first gear pump 4.

[0029] Specifically, the first gear pump 4 is connected to a motor 2, which drives the first gear pump 4 to rotate, and then pumps the hydraulic oil inside the oil tank 27 into the first oil supply pipeline to realize the flow of the hydraulic oil. A coupling 3 is also provided between the motor 2 and the first gear pump 4. By setting an oil suction filter 1, when the first gear pump 4 pumps the hydraulic oil inside the oil tank 27 into the first oil supply pipeline, impurities inside the oil tank 27 can be filtered to prevent impurities inside the oil tank 27 from entering the first oil supply pipe. When the first gear pump 4 pumps the hydraulic oil into the first oil supply pipeline, the hydraulic oil will pass through the first gear pump 4, and it is likely to pump out the impurities inside the first gear pump 4. By setting a high-pressure oil filter 5, impurities inside the first gear pump 4 can be filtered to prevent impurities inside the first gear pump 4 from further entering other parts in the first oil supply pipeline, further ensuring the cleanliness of the hydraulic oil inside the first oil supply pipeline.

[0030] Reference Figure 1 or Figure 2 In some embodiments of the present invention, the first end of the first return line is connected to the oil tank 27 through the return oil filter 31, and the return oil filter 31 is used to prevent impurities from entering the interior of the oil tank 27.

[0031] When the hydraulic oil in the system refluxes, it eventually flows into the first reflux pipeline, and the first end of the first reflux pipeline is connected to the oil tank 27. Therefore, by arranging the return oil filter 31 at the first end of the first reflux pipeline, the return oil filter 31 can filter the refluxed hydraulic oil, thereby preventing impurities in the refluxed hydraulic oil from entering the oil tank 27.

[0032] Reference Figure 1 or Figure 2 In some embodiments of the utility model, a one-way valve 7 is provided between the high-pressure oil filter 5 and the electromagnetic ball valve 10; the hydraulic system also includes a second return line, a first end of the second return line is connected between the proportional relief valve 8 and the return oil filter 31, and a second end of the second return line is connected between the high-pressure oil filter 5 and the one-way valve 7; the second return line is provided with an overflow valve 6, and the overflow valve 6 is used to adjust the pressure of the first oil supply line. When the pressure of the first oil supply line is higher than the rated value, the hydraulic oil returns to the oil tank 27 through the overflow valve 6.

[0033] Specifically, the first oil supply pipeline is provided in a pressure detector, and the pressure detector is connected to the overflow valve 6 signal. When the pressure detector detects that the pressure of the first oil supply pipeline is higher than the rated value, and transmits the signal to the overflow valve 6, the overflow valve 6 is automatically opened, so that the hydraulic oil flows back to the oil tank 27 through the overflow valve 6, thereby reducing the pressure inside the first oil supply pipeline, preventing mechanical damage and accidents caused by excessive pressure, and ensuring that the system is at normal working pressure. By setting a one-way valve 7, it is ensured that the hydraulic oil can only flow from the first gear pump 4 to the electromagnetic ball valve 10, and cannot flow in the opposite direction. This ensures that the system loop operates stably and protects the power source.

[0034] Reference Figure 1 or Figure 2 In some embodiments of the utility model, a first stop valve 11 and a one-way throttle valve 12 are provided in sequence between the electromagnetic ball valve 10 and the second end of the first oil supply pipeline. The first stop valve 11 is used to control the on-off of the first oil supply pipeline; the one-way throttle valve 12 is used to switch between the fifth state and the sixth state. In the fifth state, the one-way throttle valve 12 is used to prevent the hydraulic oil from moving from the second end of the first oil supply pipeline to the first stop valve 11; in the sixth state, the one-way throttle valve 12 is used to control the speed at which the hydraulic oil moves from the second end of the first oil supply pipeline to the first stop valve 11.

[0035] Reference Figure 1 or Figure 2In some embodiments of the utility model, an accumulator 20 is also included, a first end of the accumulator 20 is connected between the one-way valve 7 and the electromagnetic ball valve 10, a second end of the accumulator 20 is connected to the oil tank 27, a second stop valve 24 is provided between the accumulator 20 and the oil tank 27, and a first pressure gauge 21 is provided between the accumulator 20 and the first oil supply pipeline.

[0036] In the above structure, the accumulator 20 can store energy in the form of compression energy or potential energy when the system does not need energy, and then release the stored energy in the form of hydraulic pressure or air pressure when the system needs energy, and resupply the system. This helps to maintain the stability of the system pressure and ensure that the system can operate normally under various working conditions. Secondly, when the system pressure increases instantly, the accumulator 20 can absorb this part of the energy, play a role of buffering and shock absorption, so as to protect the components of the system from damage. In addition, the accumulator 20 can also absorb or alleviate the impact pressure caused by the sudden reversal of the reversing valve and the sudden stop of the cylinder, which helps to reduce the vibration and noise of the system. In the case of a sudden power outage or failure that causes the oil pump to interrupt the oil supply, the accumulator 20 can provide a certain amount of oil as an emergency power source. The accumulator 20 can replenish the oil supply to the system to keep the system pressure constant and ensure the stable operation of the system. Furthermore, when the temperature of the system rises, the hydraulic oil will expand in volume. At this time, the accumulator 20 can absorb the volume increase of the liquid, prevent overpressure, and ensure the safety of the system. When the temperature drops, the volume of the liquid shrinks, and the accumulator 20 can provide the required liquid to the outside to maintain the stability of the system.

[0037] In some possible embodiments, the first pressure gauge 21 is connected to the first oil supply pipeline via a first pressure measuring and exhaust joint 23 , and the first pressure gauge 21 is connected to the first pressure measuring and exhaust joint 23 via a first high-pressure hose 22 .

[0038] Reference Figure 1 or Figure 2 In some embodiments of the utility model, the oil tank 27 is provided with a liquid level and liquid temperature gauge 30, which is used to measure the oil volume and oil temperature inside the oil tank 27. The oil tank 27 is provided with an air filter 29, and the oil tank 27 is exhausted through the air filter 29. The bottom of the oil tank 27 is also provided with a second ball valve 28, and when the oil tank 27 needs to be changed, the oil can be changed through the second ball valve 28.

[0039] Reference Figure 1 or Figure 2 In some embodiments of the utility model, a second oil supply pipeline is further included, a first end of the second oil supply pipeline is connected to the oil tank 27, the second oil supply pipeline is provided with a second gear pump 32, and the second gear pump 32 is connected to the manual pump 25.

[0040] Specifically, a first ball valve 26 is also connected between the second gear pump 32 and the first pressure measuring and exhausting joint 23. A second stop valve 24, a pressure sensor 19, and a second pressure gauge 16 are sequentially arranged on the second oil supply pipeline from the second gear pump 32 to the second end of the second oil supply pipeline, wherein the second pressure gauge 16 is connected to the second oil supply pipeline through the second pressure measuring and exhausting joint 18, and the second pressure gauge 16 and the second pressure measuring and exhausting joint 18 are connected through a second high-pressure hose 17. The operation of the second gear pump 32 is controlled by a manual pump 25 in the second oil supply pipeline. The second oil supply pipeline and the first oil supply pipeline are two parallel pipelines, and the control of the hydraulic oil between the two is also parallel, and the two can be replaced.

[0041] Reference Figure 1 or Figure 2 The utility model also provides a braking device, including a hydraulic system as in any embodiment, a first high-speed brake 14 and a second high-speed brake 15, wherein the first high-speed brake 14 and the second high-speed brake 15 are connected in parallel to the second end of the first oil supply pipeline.

[0042] Specifically, the first high-speed brake 14 is connected to the first oil supply pipeline and the second oil supply pipeline through the third high-pressure hose 13. The second high-speed brake 15 is connected to the one-way throttle valve 12 on the first oil supply pipeline through the third high-pressure hose 13, and the first branch of the second end of the second oil supply pipeline is connected between the first stop valve 11 and the one-way throttle valve 12 on the first oil supply pipeline, and the second branch of the second end of the second oil supply pipeline is connected to the first high-speed brake 14 through the third high-pressure hose 13.

[0043] With such arrangement, when braking is required, the manual pump 25 can be used to control the second gear pump 32 to control the supply of hydraulic oil to the first high-speed gate 14 and the second high-speed gate 15, thereby controlling the brake. The motor 2 can also be used to control the first gear pump 4 to control the supply of hydraulic oil to the first high-speed gate 14 and the second high-speed gate 15, thereby controlling the brake. The two control modes can be switched according to the needs of the actual situation. And the latter can achieve graded precise control, so that the brake device can meet the braking requirements under different working conditions and speeds.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A hydraulic system, characterized in that: include: Fuel tank (27); a first oil supply pipeline, wherein the first end of the first oil supply pipeline is in communication with the oil tank (27), the first oil supply pipeline is provided with a first gear pump (4) and an electromagnetic ball valve (10) in sequence from the first end to the second end thereof, the electromagnetic ball valve (10) being used to switch between a first state and a second state; in the first state, the hydraulic oil moves from the first end of the first oil supply pipeline to the second end of the first oil supply pipeline; in the second state, the hydraulic oil moves from the second end of the first oil supply pipeline to the first end of the first oil supply pipeline; A first return pipeline, wherein a first end of the first return pipeline is connected to the oil tank (27); when the electromagnetic ball valve (10) is in the second state, a second end of the first return pipeline is connected to the electromagnetic ball valve (10) through an electromagnetic reversing valve (9); a proportional relief valve (8) is provided between the electromagnetic reversing valve (9) and the oil tank (27); the electromagnetic reversing valve (9) is used to switch between a third state and a fourth state; in the third state, an outlet of the electromagnetic reversing valve (9) is connected to the oil tank (27); in the fourth state, an outlet of the electromagnetic reversing valve (9) is connected to the proportional relief valve (8).

2. The hydraulic system according to claim 1, characterized in that: An oil suction filter (1) is provided between the first gear pump (4) and the oil tank (27), and the oil suction filter (1) is used to filter impurities in the oil tank (27); a high-pressure oil filter (5) is provided between the first gear pump (4) and the electromagnetic ball valve (10), and the high-pressure oil filter (5) is used to filter impurities in the first gear pump (4).

3. The hydraulic system according to claim 2, characterized in that: The first end of the first return pipeline is connected to the oil tank (27) through an oil return filter (31), and the oil return filter (31) is used to prevent impurities from entering the interior of the oil tank (27).

4. The hydraulic system according to claim 3, characterized in that: A one-way valve (7) is provided between the high-pressure oil filter (5) and the electromagnetic ball valve (10); The hydraulic system further comprises a second return pipeline, wherein a first end of the second return pipeline is connected between the proportional relief valve (8) and the return oil filter (31), and a second end of the second return pipeline is connected between the high-pressure oil filter (5) and the one-way valve (7); The second return pipeline is provided with an overflow valve (6), and the overflow valve (6) is used to adjust the pressure of the first oil supply pipeline. When the pressure of the first oil supply pipeline is higher than a rated value, the hydraulic oil flows back to the oil tank (27) through the overflow valve (6).

5. The hydraulic system according to any one of claims 1 to 4, characterized in that: A first stop valve (11) and a one-way throttle valve (12) are provided in sequence between the electromagnetic ball valve (10) and the second end of the first oil supply pipeline, wherein the first stop valve (11) is used to control the on-off of the first oil supply pipeline; The one-way throttle valve (12) is used to switch between a fifth state and a sixth state. In the fifth state, the one-way throttle valve (12) is used to prevent the hydraulic oil from moving from the second end of the first oil supply pipeline to the first stop valve (11); in the sixth state, the one-way throttle valve (12) is used to control the speed at which the hydraulic oil moves from the second end of the first oil supply pipeline to the first stop valve (11).

6. The hydraulic system according to claim 4, characterized in that: The invention also comprises an accumulator (20), wherein a first end of the accumulator (20) is connected between the one-way valve (7) and the electromagnetic ball valve (10), a second end of the accumulator (20) is connected with the oil tank (27), a second stop valve (24) is provided between the accumulator (20) and the oil tank (27), and a first pressure gauge (21) is provided between the accumulator (20) and the first oil supply pipeline.

7. A hydraulic system according to claim 1, 2, 3, 4 or 6, characterized in that: The oil tank (27) is provided with a liquid level and liquid temperature meter (30), and the liquid level and liquid temperature meter (30) is used to measure the amount and temperature of oil inside the oil tank (27).

8. A hydraulic system according to claim 1, 2, 3, 4 or 6, characterized in that: The oil tank (27) is provided with an air filter (29), and the oil tank (27) is exhausted through the air filter (29).

9. The hydraulic system according to claim 1, 2, 3, 4 or 6, characterized in that: It also includes a second oil supply pipeline, a first end of which is in communication with the oil tank (27), the second oil supply pipeline is provided with a second gear pump (32), and the second gear pump (32) is connected to a manual pump (25).

10. A braking device, characterized in that: It comprises a hydraulic system as claimed in any one of claims 1 to 9, a first high-speed brake (14) and a second high-speed brake (15), wherein the first high-speed brake (14) and the second high-speed brake (15) are connected in parallel at the second end of the first oil supply pipeline.

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