Quartering hammer hydraulic system and operation machine

Abstract

The utility model relates to the technical field of engineering machinery, and discloses a breaking hammer hydraulic system and an operation machine. An oil return port of the breaking hammer main body is communicated with the hydraulic oil tank through a first oil return path; an oil return opening of the main control valve is communicated with the hydraulic oil tank through a second oil return path; the radiator is arranged on the path of the second oil return path; return oil of the breaking hammer body can directly flow into the hydraulic oil tank, the radiator can be prevented from being impacted by high pressure, the second conveying assembly can continuously convey hydraulic oil to the oil inlet of the radiator so as to supplement the oil quantity of the hydraulic oil flowing through the radiator, and the service life of the radiator is prolonged. The cooling effect of the hydraulic oil in the working process is guaranteed, in this way, the system heat dissipation requirement is met, meanwhile, the oil pressure of the hydraulic oil entering the radiator is low, pressure fluctuation is small, and the radiator can continuously, stably and reliably conduct heat dissipation work.

Description

Technical Field

[0001] The utility model relates to the technical field of engineering machinery, in particular to a hydraulic system of a breaker hammer and an operating machinery. Background Art

[0002] Hydraulic breaker is an important equipment in the process of mining and engineering stone crushing. It has the characteristics of high efficiency and low cost. The hydraulic breaker uses the static pressure of liquid as the power, drives the piston to reciprocate through the hydraulic oil, and hits the drill rod at high speed during the piston stroke, and then the drill rod breaks the ore and concrete and other solids. In order to make the hydraulic breaker work normally and prevent the hydraulic oil temperature from being too high, the hydraulic oil needs to be continuously cooled.

[0003] At present, the hydraulic oil of the existing hydraulic breaker hydraulic system is mainly dissipated through the radiator. The hydraulic oil discharged from the hydraulic breaker and the main control valve is connected to the hydraulic oil tank through the return oil line. The radiator is arranged on the path of the return oil line. The hydraulic oil in the return oil line flows through the radiator to reduce the oil temperature. However, since the return oil pressure of the hydraulic breaker is high and the return oil pressure varies greatly when working, the radiator has a short working life under such conditions and is prone to premature damage and failure. Utility Model Content

[0004] In view of this, the utility model provides a hydraulic system for a hydraulic breaker and an operating machine to solve the problem of short service life of the radiator in the hydraulic system of the existing hydraulic breaker.

[0005] In the first aspect, the utility model provides a hydraulic system for a breaker hammer, comprising: a hydraulic oil tank for storing hydraulic oil; a breaker hammer body, whose oil return port is connected to the hydraulic oil tank through a first oil return circuit; a main control valve, the hydraulic oil tank supplies hydraulic oil to the breaker hammer body via a first delivery component via the main control valve, and the oil return port of the main control valve is connected to the hydraulic oil tank through a second oil return circuit; a radiator, arranged on the path of the second oil return circuit; a second delivery component, respectively connected to the second oil return circuit and the hydraulic oil tank, and the second delivery component is used to deliver the hydraulic oil in the hydraulic oil tank to the oil inlet of the radiator.

[0006] Beneficial effect: The breaker body is directly connected to the hydraulic oil tank through the first oil return circuit. During normal operation, the return oil of the breaker body can flow directly into the hydraulic oil tank without passing through the radiator, which can effectively prevent the radiator from being subjected to high-pressure impact. The hydraulic oil tank is connected to the oil inlet of the radiator through the second conveying component. The second conveying component can continuously convey hydraulic oil to the oil inlet of the radiator to replenish the amount of hydraulic oil flowing through the radiator, thereby ensuring the cooling effect of the hydraulic oil during operation. In this way, while meeting the heat dissipation requirements of the system, the oil pressure of the hydraulic oil entering the radiator is lower and the pressure fluctuation is smaller, so that the radiator can continuously, stably and reliably perform heat dissipation work, effectively solving the problem of short working life of the radiator in the hydraulic system of the existing hydraulic breaker.

[0007] In an optional embodiment, the second conveying component is a variable displacement pump, and the breaker hydraulic system further includes a controller for controlling the displacement of the second conveying component.

[0008] Beneficial effect: During normal operation, as the temperature of the hydraulic oil in the hydraulic system changes, the displacement of the second conveying assembly can be flexibly adjusted through the controller. When the temperature of the hydraulic oil gradually increases, the displacement of the second conveying assembly is increased accordingly, increasing the hydraulic oil flow in the radiator and improving the heat dissipation efficiency, so that the hydraulic oil can be cooled to an optimal temperature more quickly, ensuring safe and reliable operation of the hydraulic system.

[0009] In an optional embodiment, it also includes a reversing valve connected to the controller, which is arranged on the path of the first oil return circuit and the second oil return circuit. The reversing valve and the radiator are arranged in sequence along the oil return direction of the second oil return circuit. The reversing valve has a first valve position that makes the first oil return circuit and the second oil return circuit unobstructed, and the reversing valve also has a second valve position that makes the first oil return circuit and the second oil return circuit merge into the first oil return circuit.

[0010] Beneficial effect: When the temperature of the hydraulic oil is lower than the preset minimum oil temperature for normal operation, it is usually necessary to quickly heat up the hydraulic oil. At this time, the controller controls the reversing valve to switch to the second valve position, and the hydraulic oil in the first oil return circuit and the second oil return circuit all enter the hydraulic oil tank directly through the first oil return circuit without passing through the radiator, so that the radiator is protected from the impact of the hydraulic oil, and the hydraulic oil temperature is more efficiently raised to the normal operating temperature, effectively improving the flexibility of the hydraulic system working process.

[0011] In an optional embodiment, the reversing valve further has a third valve position for causing the second oil return circuit and the first oil return circuit to merge into the second oil return circuit.

[0012] Beneficial effect: When the temperature of the hydraulic oil exceeds the preset maximum oil temperature for normal operation, the controller controls the reversing valve to switch to the third valve position, and all the hydraulic oil in the first oil return circuit and the second oil return circuit enter the radiator through the second oil return circuit. At this time, the return oil flow through the radiator is the largest, and the radiator is in the maximum heat dissipation condition, cooling the hydraulic oil to the maximum extent, preventing the hydraulic system from malfunctioning and damaging due to excessive oil temperature, and effectively improving the safety of the hydraulic system's working process.

[0013] In an optional embodiment, it also includes a first pressure relief assembly arranged in the first oil return circuit, the first pressure relief assembly is connected to the oil inlet of the reversing valve located in the first oil return circuit, and the pressure relief oil port of the first pressure relief assembly is connected to the hydraulic oil tank.

[0014] Beneficial effect: The first pressure relief component can effectively reduce the high pressure of the hydraulic oil in the first oil return circuit, reduce the impact of the hydraulic oil in the first oil return circuit on the reversing valve, and increase the service life of the reversing valve.

[0015] In an optional embodiment, the first pressure relief assembly includes a first one-way valve, a second one-way valve and a first pressure relief branch. The first one-way valve is arranged in the first oil return circuit and is unidirectionally conducted along the oil return direction. The first one-way valve and the reversing valve are arranged in sequence along the oil return direction. The oil inlet of the first one-way valve is connected to the hydraulic oil tank through the first pressure relief branch. The second one-way valve is arranged in the first pressure relief branch and is unidirectionally conducted along the oil return direction. The opening pressure of the second one-way valve is greater than the opening pressure of the first one-way valve. The pressure relief form is simple and reliable, and is easy to produce.

[0016] In an optional embodiment, it also includes a second pressure relief assembly arranged in the second oil return circuit, the second pressure relief assembly is connected to the oil inlet of the reversing valve located in the second oil return circuit, and the pressure relief oil port of the second pressure relief assembly is connected to the hydraulic oil tank.

[0017] Beneficial effect: The second pressure relief component can effectively reduce the high pressure of the hydraulic oil in the second oil return circuit, reduce the impact of the hydraulic oil in the second oil return circuit on the reversing valve and the radiator, and increase the service life of the reversing valve and the radiator.

[0018] In an optional embodiment, the second pressure relief assembly includes a third one-way valve, a fourth one-way valve and a second pressure relief branch. The third one-way valve is arranged in the second oil return circuit and is unidirectionally conducted along the oil return direction. The third one-way valve and the reversing valve are arranged in sequence along the oil return direction. The oil inlet of the third one-way valve is connected to the hydraulic oil tank through the second pressure relief branch. The fourth one-way valve is arranged in the second pressure relief branch and is unidirectionally conducted along the oil return direction. The opening pressure of the fourth one-way valve is greater than the opening pressure of the third one-way valve. The pressure relief form is simple and reliable, and is easy to produce and manufacture.

[0019] In an optional implementation, the opening pressure of the first one-way valve is consistent with the opening pressure of the third one-way valve, and the opening pressure of the second one-way valve is consistent with the opening pressure of the fourth one-way valve.

[0020] Beneficial effect: ensure the consistency of pressure relief pressure, and prevent the reversing valve and radiator from being damaged due to a large difference in hydraulic oil pressure when the first hydraulic oil return circuit and the second hydraulic oil return circuit are connected.

[0021] In the second aspect, the utility model also provides an operating machine, which includes: a machine body; the above-mentioned breaker hydraulic system, which is arranged on the machine body; a driving device, which is arranged on the machine body, and the driving device is driven and connected to the first conveying component and the second conveying component of the breaker hydraulic system. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 A schematic diagram of the connection of a hydraulic system of a breaker hammer according to an embodiment of the utility model;

[0024] Figure 2 for Figure 1 A partial enlarged schematic diagram of the breaker hydraulic system is shown.

[0025] Figure 3 for Figure 1 The diagram shown is a schematic diagram of the relationship between the displacement of the second delivery component and the hydraulic oil temperature in the hydraulic system of the breaker hammer.

[0026] Description of reference numerals:

[0027] 101. Hydraulic oil tank; 102. Breaker body; 103. Main control valve; 104. First conveying assembly; 105. Radiator;

[0028] 2. First oil return circuit; 3. Second oil return circuit; 4. Second delivery assembly; 5. Controller; 6. Reversing valve;

[0029] 7. First pressure relief assembly; 701. First one-way valve; 702. Second one-way valve; 703. First pressure relief branch;

[0030] 8. Second pressure relief assembly; 801. Third one-way valve; 802. Fourth one-way valve; 803. Second pressure relief branch;

[0031] 901, oil return filter; 902, oil suction filter; 903, engine; 904, fan. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0033] Combine the following Figures 1 to 3 , describing an embodiment of the utility model.

[0034] In the related art, in order to alleviate the influence of the return oil pressure of the hydraulic breaker on the radiator when the hydraulic breaker is working, a pressure relief branch is usually set at the oil inlet of the radiator. When the pressure is high, the hydraulic oil in the return oil circuit is diverted through a one-way valve or a pressure relief valve, thereby reducing the pressure of the hydraulic oil flowing into the radiator. This measure can only reduce part of the pressure when the return oil pressure is too high, and cannot be adjusted to the ideal pressure. The high-pressure oil flowing out of the hydraulic breaker will still flow through the radiator, and the oil pressure will still fluctuate greatly, which will still cause premature damage to the radiator.

[0035] In addition, in the related art, the service life of the radiator is also improved by adding accumulators or increasing the pressure resistance of the radiator. When using accumulators, smaller accumulators are not effective in smoothing out peaks and valleys, while large accumulators will significantly increase the complexity of the device and manufacturing costs. In terms of improving the pressure resistance of the radiator, due to the structural limitations of the radiator, there is very limited room for improving the pressure resistance, and the feasibility of improvement in this regard is low.

[0036] According to an embodiment of the utility model, on the one hand, a hydraulic system for a breaker hammer is provided, comprising: a hydraulic oil tank 101, a breaker hammer body 102, a main control valve 103, a radiator 105 and a second conveying assembly 4, the hydraulic oil tank 101 is used to store hydraulic oil, the return oil port of the breaker hammer body 102 is connected with the hydraulic oil tank 101 through the first return oil circuit 2, the hydraulic oil tank 101 supplies hydraulic oil to the breaker hammer body 102 through the first conveying assembly 104 via the main control valve 103, the return oil port of the main control valve 103 is connected with the hydraulic oil tank 101 through the second return oil circuit 3, the radiator 105 is arranged on the path of the second return oil circuit 3, and is respectively connected with the second return oil circuit 3 and the hydraulic oil tank 101, and the second conveying assembly 4 is used to convey the hydraulic oil in the hydraulic oil tank 101 to the oil inlet of the radiator 105.

[0037] The hydraulic system of the breaker hammer using the present embodiment directly connects the breaker hammer body 102 to the hydraulic oil tank 101 through the first oil return line 2. During normal operation, the return oil of the breaker hammer body 102 can directly flow into the hydraulic oil tank 101 without passing through the radiator 105, which can effectively prevent the radiator 105 from being subjected to high-pressure impact. The hydraulic oil tank 101 is connected to the oil inlet of the radiator 105 through the second conveying component 4. The second conveying component 4 can continuously convey hydraulic oil to the oil inlet of the radiator 105 to replenish the amount of hydraulic oil flowing through the radiator 105, thereby ensuring the cooling effect of the hydraulic oil during operation. In this way, while meeting the heat dissipation requirements of the system, the oil pressure of the hydraulic oil entering the radiator 105 is low and the pressure fluctuation is small, so that the radiator 105 can continuously, stably and reliably perform heat dissipation work, effectively solving the problem of short service life of the radiator in the existing hydraulic breaker hammer hydraulic system.

[0038] It should be noted that there is no limitation on the specifications of the first conveying component 104 and the second conveying component 4. The pump bodies may be gear pumps, vane pumps, plunger pumps, etc. The number of pump bodies can be flexibly selected according to demand and is not strictly limited here.

[0039] In this embodiment, the second conveying component 4 is a variable pump, and the breaker hydraulic system also includes a controller 5 for controlling the displacement of the second conveying component 4. During normal operation, as the temperature of the hydraulic oil in the hydraulic system changes, the displacement of the second conveying component 4 can be flexibly adjusted through the controller 5. When the temperature of the hydraulic oil gradually increases, the displacement of the second conveying component 4 is increased accordingly, the hydraulic oil flow in the radiator 105 is increased, the heat dissipation efficiency is improved, and the hydraulic oil can be cooled to an optimal temperature more quickly, thereby ensuring safe and reliable operation of the hydraulic system.

[0040] Preferably, the second delivery component 4 is a variable displacement piston pump.

[0041] In the present embodiment, a reversing valve 6 connected to the controller 5 is also included. The reversing valve 6 is arranged on the path of the first oil return circuit 2 and the second oil return circuit 3. The reversing valve 6 and the radiator 105 are arranged in sequence along the oil return direction of the second oil return circuit 3. The reversing valve 6 has a first valve position that makes the first oil return circuit 2 and the second oil return circuit 3 unobstructed. The reversing valve 6 also has a second valve position that makes the first oil return circuit 2 and the second oil return circuit 3 merge into the first oil return circuit 2. When the oil temperature of the hydraulic oil is lower than the preset normal working minimum oil temperature, it is usually necessary to quickly heat up the hydraulic oil. At this time, the controller 5 controls the reversing valve 6 to switch to the second valve position, and the hydraulic oil in the first oil return circuit 2 and the second oil return circuit 3 all directly enter the hydraulic oil tank 101 via the first oil return circuit 2 without passing through the radiator 105, so that the radiator 105 is protected from the impact of the hydraulic oil, and the hydraulic oil temperature is more efficiently raised to the normal working temperature, effectively improving the flexibility of the working process of the hydraulic system.

[0042] In this embodiment, the reversing valve 6 also has a third valve position that allows the second oil return circuit 3 and the first oil return circuit 2 to merge into the second oil return circuit 3. The switching of three working conditions can be achieved through one reversing valve 6, which can effectively reduce the number of components. Among them, when the oil temperature of the hydraulic oil exceeds the preset normal working maximum oil temperature, the controller 5 controls the reversing valve 6 to switch to the third valve position, and the hydraulic oil in the first oil return circuit 2 and the second oil return circuit 3 all enter the radiator 105 through the second oil return circuit 3. At this time, the return oil flow rate flowing through the radiator 105 is the largest, and the radiator 105 is in the maximum heat dissipation condition, so that the hydraulic oil is cooled to the maximum extent, and the oil temperature in the hydraulic system is prevented from being too high and causing failures and damage, thereby effectively improving the safety of the hydraulic system working process.

[0043] Among them, Figure 1 As shown, the reversing valve 6 is a three-position four-way valve. It can be understood that, as an alternative embodiment, the reversing valve 6 can also be a reversing valve in the form of two two-position four-way valves or a three-position multi-way valve. As long as the connection function of the above three valve positions can be achieved, it belongs to the protection content of this patent.

[0044] In this embodiment, the hydraulic system of the breaker hammer also includes a first pressure relief component 7 arranged in the first oil return circuit 2. The first pressure relief component 7 is connected to the oil inlet of the reversing valve 6 located in the first oil return circuit 2. The pressure relief oil port of the first pressure relief component 7 is connected to the hydraulic oil tank 101. The first pressure relief component 7 can effectively reduce the high-pressure pressure of the hydraulic oil in the first oil return circuit 2, reduce the impact of the hydraulic oil in the first oil return circuit 2 on the reversing valve 6, and improve the service life of the reversing valve 6.

[0045] In this embodiment, the first pressure relief assembly 7 includes a first one-way valve 701, a second one-way valve 702 and a first pressure relief branch 703. The first one-way valve 701 is arranged in the first oil return circuit 2 and is unidirectionally conducted along the oil return direction. The first one-way valve 701 and the reversing valve 6 are arranged in sequence along the oil return direction. The oil inlet of the first one-way valve 701 is connected to the hydraulic oil tank 101 through the first pressure relief branch 703. The second one-way valve 702 is arranged in the first pressure relief branch 703 and is unidirectionally conducted along the oil return direction. The opening pressure of the second one-way valve 702 is greater than the opening pressure of the first one-way valve 701. The pressure relief form is simple and reliable, and is convenient for production and manufacturing.

[0046] In this embodiment, the hydraulic system of the breaker hammer also includes a second pressure relief component 8 arranged in the second oil return circuit 3. The second pressure relief component 8 is connected to the oil inlet of the reversing valve 6 located in the second oil return circuit 3. The pressure relief oil port of the second pressure relief component 8 is connected to the hydraulic oil tank 101. The second pressure relief component 8 can effectively reduce the high-pressure pressure of the hydraulic oil in the second oil return circuit 3, reduce the impact of the hydraulic oil in the second oil return circuit 3 on the reversing valve 6 and the radiator 105, and improve the service life of the reversing valve 6 and the radiator 105.

[0047] In this embodiment, the second pressure relief assembly 8 includes a third one-way valve 801, a fourth one-way valve 802 and a second pressure relief branch 803. The third one-way valve 801 is arranged in the second oil return circuit 3 and is unidirectionally conducted along the oil return direction. The third one-way valve 801 and the reversing valve 6 are arranged in sequence along the oil return direction. The oil inlet of the third one-way valve 801 is connected to the hydraulic oil tank 101 through the second pressure relief branch 803. The fourth one-way valve 802 is arranged in the second pressure relief branch 803 and is unidirectionally conducted along the oil return direction. The opening pressure of the fourth one-way valve 802 is greater than the opening pressure of the third one-way valve 801. The pressure relief form is simple and reliable, and is convenient for production and manufacturing.

[0048] Specifically, Figure 2 As shown, one end of the first pressure relief branch 703 in the oil return direction is connected to the portion of the first oil return circuit 2 that is connected to the oil outlet of the reversing valve 6, and one end of the second pressure relief branch 803 in the oil return direction is connected to the portion of the second oil return circuit 3 that is connected to the oil outlet of the radiator 105. At the same time, one end of the first pressure relief branch 703 in the oil return direction is connected to one end of the second pressure relief branch 803 in the oil return direction.

[0049] Furthermore, if Figure 1 As shown, the first oil return circuit 2 and the second oil return circuit 3 are connected to the hydraulic oil tank 101 through the corresponding return oil filters 901 respectively; the oil inlets of the first conveying component 104 and the second conveying component 4 are connected to the hydraulic oil tank 101 through the corresponding oil suction filters 902 to filter impurities.

[0050] In this embodiment, the opening pressure of the first one-way valve 701 is consistent with the opening pressure of the third one-way valve 801, and the opening pressure of the second one-way valve 702 is consistent with the opening pressure of the fourth one-way valve 802, thereby ensuring that the pressure relief pressure is consistent and preventing damage to the reversing valve 6 and the radiator 105 due to a large difference in hydraulic oil pressure when the first hydraulic oil return circuit 2 and the second hydraulic oil return circuit 3 are connected.

[0051] Specifically, Figure 1 and Figure 3 As shown, V is the displacement of the current reversing valve 6, Vmin is the minimum displacement of the reversing valve 6, Vmax is the maximum displacement of the reversing valve 6, T is the working oil temperature of the hydraulic oil in the current system, T1 is the lower limit of the optimal working oil temperature of the hydraulic oil set by the system, and T2 is the upper limit of the optimal working oil temperature of the hydraulic oil set by the system;

[0052] When the oil temperature is low, that is, T≤T1, the controller 5 does not output current to the second conveying assembly 4, and the displacement of the second conveying assembly 4 is minimum. At this time, the controller 5 controls the reversing valve 6 to be in the second valve position. The system return oil directly returns to the hydraulic oil tank 101 from the second check valve 702, the fourth check valve 802 and the reversing valve 6, without cooling through the radiator 105, protecting the radiator 105 while allowing the oil temperature to rise to the optimal temperature quickly.

[0053] When the oil temperature is in a normal state, that is, T1<T≤T2, the controller 5 outputs current to the second conveying assembly 4, and the linear change of the hydraulic oil temperature T from T1 to T2 corresponds to the change of the displacement V of the second conveying assembly 4 from Vmin to Vmax. At this time, the controller 5 does not output current to the reversing valve 6, and the reversing valve 6 is in the first valve position. The return oil of the breaker body 102 directly enters the hydraulic oil tank 101 through the first check valve 701 and the second check valve 702. After the return oil of the main control valve 103 merges with the return oil of the second conveying assembly 4, it returns to the radiator 105 through the third check valve 801 and the fourth check valve 802. After cooling through the radiator 105, the hydraulic oil is guaranteed to be at a better working temperature.

[0054] When the oil temperature is high, that is, T>T2, in order to ensure the maximum heat dissipation capacity, the controller 5 outputs the maximum current to the second conveying assembly 4, and the displacement of the second conveying assembly 4 is the largest. At this time, the controller 5 controls the reversing valve 6 to be in the third valve position. Part of the system return oil directly enters the hydraulic oil tank 101 from the fourth check valve 802 and the second check valve 702, and the rest of the system return oil flows through the reversing valve 6 and then flows through the radiator 105 into the hydraulic oil tank 101. At this time, the flow rate of the hydraulic oil in the radiator 105 is the largest, which can exert the maximum heat dissipation capacity and cool the oil temperature to a better temperature quickly.

[0055] Among them, it should be noted that the design principle of the oil return system is oil temperature T≤T2. The higher oil temperature working condition is for dealing with extreme working conditions. At this time, the oil temperature T>T2, and it can work for no more than 5 minutes. At this time, it is working in an extreme state.

[0056] Preferably, the value range of T1 is (50±5)°C, the value range of T2 is (70±5)°C, the value range of the opening pressure of the first one-way valve 701 and the opening pressure of the third one-way valve 801 is (2.5±0.5) bar, and the value range of the opening pressure of the second one-way valve 702 and the opening pressure of the fourth one-way valve 802 is (5±1) bar, which mainly plays a role in protecting the radiator.

[0057] According to an embodiment of the utility model, on the other hand, a working machine is provided, which includes: a machine body, the above-mentioned breaker hydraulic system and a driving device, the breaker hydraulic system is arranged on the machine body, the driving device is arranged on the machine body, and the driving device is driven and connected to the first conveying component 104 and the second conveying component 4 of the breaker hydraulic system.

[0058] In this embodiment, the driving device includes an engine 903 and a fan 904. The engine 903 drives the fan 904, the first conveying component 104 and the second conveying component 4 to work at the same time. The fan 904 blows the radiator 105 to allow the hydraulic oil therein to undergo heat exchange, thereby achieving a heat dissipation effect.

[0059] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A hydraulic system for a breaker hammer, characterized in that: include: A hydraulic oil tank (101), used for storing hydraulic oil; A breaker hammer body (102), whose oil return port is connected to the hydraulic oil tank (101) through a first oil return path (2); A main control valve (103), wherein the hydraulic oil tank (101) supplies hydraulic oil to the breaker body (102) via the first delivery assembly (104) and the main control valve (103), and the oil return port of the main control valve (103) is connected to the hydraulic oil tank (101) via a second oil return path (3); A radiator (105) is arranged on the path of the second oil return path (3); The second conveying assembly (4) is connected to the second oil return circuit (3) and the hydraulic oil tank (101), respectively, and the second conveying assembly (4) is used to convey the hydraulic oil in the hydraulic oil tank (101) to the oil inlet of the radiator (105).

2. The hydraulic system of a breaker hammer according to claim 1, characterized in that: The second conveying component (4) is a variable displacement pump, and the breaker hammer hydraulic system further comprises a controller (5) for controlling the displacement of the second conveying component (4).

3. The hydraulic system of a breaker hammer according to claim 2, characterized in that: The invention also includes a reversing valve (6) connected to the controller (5), wherein the reversing valve (6) is arranged on the paths of the first oil return circuit (2) and the second oil return circuit (3), and the reversing valve (6) and the radiator (105) are arranged in sequence along the oil return direction of the second oil return circuit (3). The reversing valve (6) has a first valve position that allows the first oil return circuit (2) and the second oil return circuit (3) to be unobstructed, and the reversing valve (6) also has a second valve position that allows the first oil return circuit (2) and the second oil return circuit (3) to merge into the first oil return circuit (2).

4. The hydraulic system of a breaker hammer according to claim 3, characterized in that: The reversing valve (6) also has a third valve position for causing the second oil return path (3) and the first oil return path (2) to merge into the second oil return path (3).

5. The hydraulic system of a breaker hammer according to claim 3 or 4, characterized in that: It also includes a first pressure relief component (7) arranged on the first oil return circuit (2), the first pressure relief component (7) being connected to the oil inlet of the reversing valve (6) located on the first oil return circuit (2), and the pressure relief oil port of the first pressure relief component (7) being connected to the hydraulic oil tank (101).

6. The hydraulic system of a breaker hammer according to claim 5, characterized in that: The first pressure relief assembly (7) comprises a first one-way valve (701), a second one-way valve (702) and a first pressure relief branch (703); the first one-way valve (701) is arranged in the first oil return circuit (2) and is unidirectionally connected along the oil return direction; the first one-way valve (701) and the reversing valve (6) are arranged in sequence along the oil return direction; the oil inlet of the first one-way valve (701) is connected to the hydraulic oil tank (101) through the first pressure relief branch (703); the second one-way valve (702) is arranged in the first pressure relief branch (703) and is unidirectionally connected along the oil return direction; the opening pressure of the second one-way valve (702) is greater than the opening pressure of the first one-way valve (701).

7. The hydraulic system for a breaker hammer according to claim 6, characterized in that: It also includes a second pressure relief component (8) arranged on the second oil return circuit (3), the second pressure relief component (8) is connected to the oil inlet of the reversing valve (6) located on the second oil return circuit (3), and the pressure relief oil port of the second pressure relief component (8) is connected to the hydraulic oil tank (101).

8. The hydraulic system for a breaker hammer according to claim 7, characterized in that: The second pressure relief assembly (8) comprises a third one-way valve (801), a fourth one-way valve (802) and a second pressure relief branch (803); the third one-way valve (801) is arranged in the second oil return line (3) and is unidirectionally connected in the oil return direction; the third one-way valve (801) and the reversing valve (6) are arranged in sequence in the oil return direction; the oil inlet of the third one-way valve (801) is connected to the hydraulic oil tank (101) through the second pressure relief branch (803); the fourth one-way valve (802) is arranged in the second pressure relief branch (803) and is unidirectionally connected in the oil return direction; the opening pressure of the fourth one-way valve (802) is greater than the opening pressure of the third one-way valve (801).

9. The hydraulic system for a breaker hammer according to claim 8, characterized in that: The opening pressure of the first one-way valve (701) is consistent with the opening pressure of the third one-way valve (801), and the opening pressure of the second one-way valve (702) is consistent with the opening pressure of the fourth one-way valve (802).

10. A working machine, characterized in that: include: body; The hydraulic system of a breaker hammer according to any one of claims 1 to 9, arranged on the machine body; A driving device is arranged on the machine body, and the driving device is connected to the first conveying component (104) and the second conveying component (4) of the hydraulic system of the breaker hammer.

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