Hydraulic control valve group, hydraulic system and control method

Abstract

This invention belongs to the field of engineering machinery, specifically relating to a hydraulic control valve assembly, a hydraulic system, and a control method. The assembly has an inlet and an outlet. The hydraulic control valve assembly includes a boom working valve and a breaker working valve. The inlet is connected to both the boom working valve and the breaker working valve inlet. The outlet is connected to both the boom working valve and the breaker working valve return ports. The first working port of the boom working valve is connected to the rod-side chamber of the boom cylinder, and the second working port is connected to the rodless chamber of the boom cylinder. The first working port of the breaker working valve is connected to the rodless chamber of the boom cylinder, and the second working port is connected to the inlet end of the breaker hammer. This invention addresses the technical problem of significant power waste caused by mismatch between operating conditions and the breaker's working mode by using two control modes for the breaker hammer.

Description

Technical Field

[0001] This invention belongs to the field of engineering machinery, specifically relating to a hydraulic control valve group, hydraulic system and control method for use in hydraulic breakers. Background Technology

[0002] As an important attachment used in construction machinery such as excavators, hydraulic breakers are widely used in municipal demolition, quarrying and mining, and rock stripping. However, because hydraulic breakers require high power to drive and generate significant vibration during operation, the large vibrations and "hammer jumping" generated during the breaking operation of excavators after the installation of hydraulic breakers greatly reduce the reliability of the overall working device, the comfort of the driver, and thus affect the lifespan of the excavator. At the same time, changes in working conditions cause a mismatch between the working mode of the hydraulic breaker and the working conditions, resulting in significant power waste and adversely affecting the economic benefits of the equipment. Summary of the Invention

[0003] To overcome the shortcomings of the prior art, the present invention provides a hydraulic control valve group, hydraulic system and control method for working hydraulic breakers, which solves the technical problem of significant power waste caused by mismatch with working conditions by using multiple control modes for working hydraulic breakers.

[0004] This invention is achieved through the following technical solution: a hydraulic control valve assembly having an oil inlet and an oil outlet, the hydraulic control valve assembly including a boom working valve and a breaker working valve, wherein:

[0005] The oil inlets are connected to the oil inlets of the boom working valve and the crushing working valve, respectively.

[0006] The oil outlet is connected to the return oil port of the boom working valve and the return oil port of the crushing working valve, respectively.

[0007] The first working port of the boom working valve is used to connect with the rod chamber of the boom cylinder, and the second working port of the boom working valve is used to connect with the rodless chamber of the boom cylinder.

[0008] The first working port of the breaker valve is used to connect to the rodless chamber of the boom cylinder, and the second working port of the breaker valve is used to connect to the oil inlet of the breaker hammer.

[0009] The boom working valve includes a first control terminal and a second control terminal. The first control terminal and the second control terminal of the boom working valve are configured to control the boom working valve to switch between an initial position, a first working position, and a second working position. In the initial position of the boom working valve, the oil inlet, oil return, first working port, and second working port of the boom working valve are all disconnected. In the first working position of the boom working valve, the oil inlet and the second working port of the boom working valve are connected, and the oil return and the first working port of the boom working valve are connected. In the second working position of the boom working valve, the oil inlet and the first working port of the boom working valve are connected, and the oil return and the second working port of the boom working valve are connected.

[0010] The crushing working valve includes a first control terminal and a second control terminal. The first control terminal and the second control terminal of the crushing working valve are configured to control the crushing working valve to switch between an initial position, a first working position, and a second working position. In the initial position of the crushing working valve, the oil inlet, the oil return port, the first working port, and the second working port of the crushing working valve are all disconnected. In the first working position of the crushing working valve, the oil inlet and the second working port are connected, and the oil return port is connected to the first working port. In the second working position of the crushing working valve, the oil inlet and the second working port are connected, and the oil return port and the first working port are both disconnected.

[0011] In some embodiments, when there is no boom control signal input at either the first control terminal or the second control terminal of the boom working valve, the boom working valve is in the initial position.

[0012] When a boom control signal is input to the first control terminal of the boom working valve, the boom working valve is controlled to be in the first working position.

[0013] When a boom control signal is input to the second control terminal of the boom working valve, the boom working valve is controlled to be in the second working position; and...

[0014] When there is no crushing control signal input at either the first control terminal or the second control terminal of the crushing working valve, the crushing working valve is in the initial position;

[0015] When a crushing control signal is input to the first control terminal of the crushing working valve, the crushing working valve is controlled to be in the first working position;

[0016] When a crushing control signal is input to the second control terminal of the crushing working valve, the crushing working valve is controlled to be in the second working position.

[0017] In some embodiments, the boom working valve is a three-position four-way valve I, wherein the first working position, the initial position, and the second working position of the boom working valve are the left working position, the middle position, and the right working position of the three-position four-way valve I, respectively.

[0018] The crushing working valve is a three-position four-way valve II, and the first working position, initial position and second working position of the crushing working valve are the left working position, middle position and right working position of the three-position four-way valve II, respectively.

[0019] In some embodiments, the boom working valve further includes a central oil inlet and a central oil outlet, and the central oil inlet of the boom working valve is connected to the oil inlet.

[0020] The crushing working valve also includes a central oil inlet and a central oil outlet. The central oil inlet of the crushing working valve is connected to the central oil outlet of the boom working valve, and the central oil outlet of the crushing working valve is connected to the oil outlet.

[0021] When the boom working valve is in the initial position and the breaker working valve is also in the initial position, the oil inlet is connected to the oil inlet in sequence through the middle oil inlet of the boom working valve, the middle oil outlet of the boom working valve, the middle oil inlet of the breaker working valve, and the middle oil outlet of the breaker working valve.

[0022] In some embodiments, the boom working valve is a three-position six-way valve I, wherein the first working position, the initial position, and the second working position of the boom working valve are the left working position, the middle position, and the right working position of the three-position six-way valve I, respectively.

[0023] The crushing working valve is a three-position six-way valve II, and the first working position, initial position and second working position of the crushing working valve are the left working position, middle position and right working position of the three-position six-way valve II, respectively.

[0024] The present invention also provides a hydraulic system, including a hydraulic oil tank, a main pump, a breaker hammer, a boom cylinder, and a hydraulic control valve group as described in any one of the above.

[0025] The oil inlet of the main pump is connected to the hydraulic oil tank, and the oil outlet of the main pump is connected to the oil inlet.

[0026] The oil outlet is connected to the hydraulic oil tank;

[0027] The first working port of the boom working valve is connected to the rod chamber of the boom cylinder, and the second working port of the boom working valve is connected to the rodless chamber of the boom cylinder.

[0028] The first working port of the breaker valve is connected to the rodless chamber of the boom cylinder, and the second working port of the breaker valve is connected to the oil inlet of the breaker hammer.

[0029] In some embodiments, it also includes a boom control valve, a crushing control valve, and a mode switching valve;

[0030] The boom control valve is connected to the first control terminal and the second control terminal of the boom working valve, respectively; the boom control valve is configured as a boom control signal source to control the first control terminal and the second control terminal of the boom working valve.

[0031] The oil inlet of the mode switching valve is connected to the crushing control valve, the oil return port of the mode switching valve is connected to the hydraulic oil tank, the first working oil port of the mode switching valve is connected to the second control end of the crushing working valve, and the second working oil port of the mode switching valve is connected to the first control end of the crushing working valve.

[0032] The mode switching valve includes an initial position and a working position. When the mode switching valve is in the initial position, the oil inlet of the mode switching valve is connected to the second working oil port of the mode switching valve, and the oil return port of the mode switching valve is connected to the first working oil port of the mode switching valve. When the mode switching valve is in the working position, the oil inlet of the mode switching valve is connected to the first working oil port of the mode switching valve, and the oil return port of the mode switching valve is connected to the second working oil port of the mode switching valve.

[0033] The crushing control valve is configured as a crushing control signal source to control the first control terminal and the second control terminal of the crushing working valve.

[0034] In some embodiments, the mode switching valve includes a first control terminal and a second control terminal;

[0035] The first control end of the mode switching valve is equipped with a spring, and the first control end of the mode switching valve is configured to control the mode switching valve to be in the initial position.

[0036] The second control terminal of the mode switching valve is equipped with an electromagnetic component, and the second control terminal of the mode switching valve is configured to control the mode switching valve to be in the working position.

[0037] In some embodiments, the return end of the hydraulic breaker is connected to the hydraulic oil tank, and shut-off valves are provided on the pipeline between the return end of the hydraulic breaker and the hydraulic oil tank, as well as on the pipeline between the inlet end of the hydraulic breaker and the second working port of the breaker working valve; when the hydraulic breaker is working, all shut-off valves are in the open state.

[0038] In some embodiments, an overflow valve is provided between the oil outlet of the main pump and the hydraulic oil tank.

[0039] The present invention also provides a control method for a hydraulic system, including the hydraulic system described in any one of the above claims.

[0040] In the first crushing condition, the boom working valve is controlled to be in the initial position and the crushing working valve is in the first working position; the hydraulic oil introduced by the main pump flows to the oil inlet end of the breaker through the crushing working valve to supply oil to the breaker, and the hydraulic oil in the rodless chamber of the boom cylinder flows to the hydraulic oil tank through the crushing working valve, so that the breaker can carry out the crushing work.

[0041] In the second crushing condition, the boom working valve and the crushing working valve are controlled to be in the second working position. The hydraulic oil introduced by the main pump is divided into two paths. One path of hydraulic oil flows through the crushing working valve to the oil inlet end of the breaker hammer to supply oil to the breaker hammer. The other path of hydraulic oil flows through the boom working valve to the rod chamber of the boom cylinder to supply oil to the rod chamber of the boom cylinder. The hydraulic oil in the rodless chamber of the boom cylinder flows through the boom working valve to the hydraulic oil tank, and the breaker hammer realizes the crushing operation.

[0042] The beneficial effects of this invention are: 1. It solves the technical problem of significant power waste caused by mismatch with working conditions by using two modes of controlling the operation of the hydraulic breaker;

[0043] 2. The expanded new working mode only uses the weight of the boom to press down on the breaker, without the need for additional flow, reducing engine power consumption and improving fuel economy; in addition, in this mode, when the breaker is working, the excavator boom is in a free state, and the vibration generated by the breaker will not be transmitted to the frame, improving operating comfort and the life of the machine's structural components. Attached Figure Description

[0044] Figure 1 This is a schematic diagram of a first embodiment of the hydraulic control valve assembly of the present invention;

[0045] Figure 2 This is a schematic diagram of a second embodiment of the hydraulic control valve assembly of the present invention;

[0046] Figure 3 This is a schematic diagram of the hydraulic system of the present invention;

[0047] Figure 4 This is a schematic diagram of the specific control of the hydraulic system of the present invention;

[0048] In the diagram, 1. Hydraulic oil tank, 2. Main pump, 3. Boom working valve, 4. Boom control valve, 5. Crushing control valve, 6. Mode switching valve, 7. Crushing working valve, 8. Hydraulic breaker, 9. Shut-off valve, 10. Boom cylinder, 11. Relief valve. Implementation

[0049] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0050] like Figure 1 and Figure 2 As shown, a hydraulic control valve assembly has an inlet P and an outlet T. The hydraulic control valve assembly includes a boom working valve 3 and a breaker working valve 7, wherein: the inlet P is connected to the inlet of both the boom working valve 3 and the breaker working valve 7; the outlet T is connected to the return port of both the boom working valve 3 and the breaker working valve 7. One-way valves are provided between the inlet P and the inlet of the boom working valve 3, and between the inlet P and the inlet of the breaker working valve 7, so that the hydraulic oil introduced through the inlet P can reach the inlet of both the boom working valve 3 and the breaker working valve 7 in one direction via the corresponding one-way valves.

[0051] The first working port of the boom working valve 3 is used to connect to the rod chamber of the boom cylinder, and the second working port of the boom working valve 3 is used to connect to the rodless chamber of the boom cylinder; the first working port of the breaker working valve 7 is used to connect to the rodless chamber of the boom cylinder, and the second working port of the breaker working valve 7 is used to connect to the oil inlet end of the breaker hammer.

[0052] The boom working valve 3 includes a first control terminal and a second control terminal. The boom working valve 3 has an initial position, a first working position, and a second working position. The initial position, the first working position, and the second working position correspond to three different working states of the boom working valve 3. The first control terminal and the second control terminal of the boom working valve 3 are configured to control the switching of the boom working valve 3 between the initial position, the first working position, and the second working position, thereby realizing the switching of the boom working valve 3 in the three working states and completing the corresponding functions. The three working states of the boom working valve 3 are as follows:

[0053] In the initial position of the boom working valve 3, the inlet, return, first working port, and second working port of the boom working valve 3 are all disconnected. When the boom working valve 3 is in its initial position, external hydraulic oil cannot be introduced through the inlet and flow out through either the first or second working port; nor can external hydraulic oil be introduced through either the first or second working port and flow out through the return port.

[0054] In the first working position of the boom working valve 3, the oil inlet of the boom working valve 3 is connected to the second working oil port, and the oil return port of the boom working valve 3 is connected to the first working oil port. When the boom working valve 3 is in the first working position, external hydraulic oil can be introduced through the oil inlet of the boom working valve 3 and flow out through the second working oil port, or external hydraulic oil can be introduced through the first working oil port and flow out through the oil return port.

[0055] In the second working position of the boom working valve 3, the oil inlet of the boom working valve 3 is connected to the first working oil port, and the oil return port of the boom working valve 3 is connected to the second working oil port. When the boom working valve 3 is in the second working position, external hydraulic oil can be introduced through the oil inlet of the boom working valve 3 and flow out through the first working oil port, or external hydraulic oil can be introduced through the second working oil port and flow out through the oil return port.

[0056] The crushing working valve 7 includes a first control terminal and a second control terminal. The crushing working valve 7 has an initial position, a first working position, and a second working position. The initial position, first working position, and second working position correspond to three working states of the crushing working valve 7, respectively. The first control terminal and the second control terminal of the crushing working valve 7 are configured to control the switching of the crushing working valve 7 between the initial position, the first working position, and the second working position, thereby realizing the switching of the crushing working valve 7 in the three working states and completing the corresponding functions. The three working states of the crushing working valve 7 are as follows:

[0057] In the initial position of the crushing working valve 7, the inlet, return, first working port, and second working port of the crushing working valve 7 are all disconnected. When the crushing working valve 7 is in its initial position, external hydraulic oil cannot be introduced through the inlet and flow out through either the first or second working port; nor can external hydraulic oil be introduced through either the first or second working port and flow out through the return port.

[0058] In the first working position of the crushing working valve 7, the oil inlet of the crushing working valve 7 is connected to the second working oil port of the crushing working valve 7, and the oil return port of the crushing working valve 7 is connected to the first working oil port of the crushing working valve 7. When the crushing working valve 7 is in the first working position, external hydraulic oil can be introduced through the oil inlet of the crushing working valve 7 and flow out through the second working oil port, or external hydraulic oil can be introduced through the first working oil port of the crushing working valve 7 and flow out through the oil return port of the crushing working valve 7.

[0059] In the second working position of the crushing working valve 7, the oil inlet of the crushing working valve 7 is connected to the second working oil port of the crushing working valve 7, while the oil return port and the first working oil port of the crushing working valve 7 are both disconnected. When the crushing working valve 7 is in the second working position, external hydraulic oil can be introduced through the oil inlet of the crushing working valve 7 and flow out through the second working oil port, but it is not possible to introduce external hydraulic oil through the first working oil port of the crushing working valve 7 and allow it to flow out through the oil return port.

[0060] In some embodiments, the first control terminal and the second control terminal of the boom working valve 3 are used to control the switching of the boom working valve 3 between the initial position, the first working position, and the second working position in the following specific manner:

[0061] When there is no boom control signal input at either the first control terminal or the second control terminal of the boom working valve 3, the boom working valve 3 is in the initial position;

[0062] When a boom control signal is input to the first control terminal of the boom working valve 3, the boom working valve 3 is controlled to be in the first working position.

[0063] When a boom control signal is input to the second control terminal of the boom working valve 3, the boom working valve 3 is controlled to be in the second working position.

[0064] The first control terminal and the second control terminal of the crushing working valve 7 are used to control the switching of the crushing working valve 7 between the initial position, the first working position, and the second working position as follows:

[0065] When there is no crushing control signal input at either the first control terminal or the second control terminal of the crushing working valve 7, the crushing working valve 7 is in the initial position;

[0066] When a crushing control signal is input to the first control terminal of the crushing working valve 7, the crushing working valve 7 is controlled to be in the first working position;

[0067] When a crushing control signal is input to the second control terminal of the crushing working valve 7, the crushing working valve 7 is controlled to be in the second working position.

[0068] In some embodiments, such as Figure 1 As shown, the boom working valve 3 is a three-position four-way valve I. The first working position, the initial position, and the second working position of the boom working valve 3 are the left working position, the middle position, and the right working position of the three-position four-way valve I, respectively.

[0069] The crushing working valve 7 is a three-position four-way valve II. The first working position, the initial position, and the second working position of the crushing working valve 7 are the left working position, the middle position, and the right working position of the three-position four-way valve II, respectively.

[0070] In some embodiments, the boom working valve 3 further includes a central oil inlet and a central oil outlet, and the central oil inlet of the boom working valve 3 is connected to the oil inlet P.

[0071] The crushing working valve 7 also includes a central oil inlet and a central oil outlet. The central oil inlet of the crushing working valve 7 is connected to the central oil outlet of the boom working valve 3, and the central oil outlet of the crushing working valve 7 is connected to the oil outlet T.

[0072] For boom working valve 3, the middle oil inlet and the middle oil outlet of boom working valve 3 are connected only when boom working valve 3 is in the initial position. When boom working valve 3 is in the first working position or the second working position, the middle oil inlet and the middle oil outlet of boom working valve 3 are disconnected.

[0073] For the crushing working valve 7, the middle oil inlet and the middle oil outlet of the crushing working valve 7 are connected only when the crushing working valve 7 is in the initial position. When the crushing working valve 7 is in the first working position or the second working position, the middle oil inlet and the middle oil outlet of the crushing working valve 7 are disconnected.

[0074] Therefore, when the boom working valve 3 is in the initial position and the breaker working valve 7 is also in the initial position, the oil inlet P is connected to the oil inlet P in sequence through the middle oil inlet of the boom working valve 3, the middle oil outlet of the boom working valve 3, the middle oil inlet of the breaker working valve 7, and the middle oil outlet of the breaker working valve 7.

[0075] Based on the above, the boom working valve 3 also includes a central oil inlet and a central oil outlet, and the crushing working valve 7 also includes a central oil inlet and a central oil outlet, as follows: Figure 2As shown, the boom working valve 3 is a three-position six-way valve I, and the first working position, initial position and second working position of the boom working valve 3 are the left working position, middle position and right working position of the three-position six-way valve I, respectively; the crushing working valve 7 is a three-position six-way valve II, and the first working position, initial position and second working position of the crushing working valve 7 are the left working position, middle position and right working position of the three-position six-way valve II, respectively.

[0076] The aforementioned hydraulic control valve assembly can be an integrated valve.

[0077] Based on the aforementioned hydraulic control valve assembly, when the breaker working valve 7 is in either the first or second working position, oil can be supplied to the breaker. For the breaker to perform its crushing operation, the piston rod of the boom cylinder needs to retract into the cylinder barrel, meaning the rodless chamber of the boom cylinder needs to be unloaded. The aforementioned hydraulic control valve assembly provides two methods for unloading oil from the rodless chamber of the boom cylinder: First, controlling both the boom working valve 3 and the breaker working valve 7 in the second working position; this is the current mode for controlling the breaker to perform crushing operations. Second, controlling the boom working valve 3 in the initial position and the breaker working valve 7 in the first working position; in this case, the hydraulic oil in the rodless chamber of the boom cylinder can flow out through the breaker working valve 7, thus unloading the rodless chamber of the boom cylinder.

[0078] like Figure 3 and Figure 4 As shown, the present invention also provides a hydraulic system, including a hydraulic oil tank 1, a main pump 2, a breaker hammer 8, a boom cylinder 10, and a hydraulic control valve assembly as described in any one of the above. The hydraulic control valve assembly is preferably an integrated valve, with the inlet P and outlet T being the ports of the integrated valve. Figures 1 to 4 As shown, the integrated valve also includes ports A1, B1, A2, B2, XA1, XB1, XA2, and XB2.

[0079] The oil inlet of the main pump 2 is connected to the hydraulic oil tank 1, and the oil outlet of the main pump 2 is connected to the oil inlet P. The main pump 2 supplies oil to the hydraulic system, and the oil outlet T is connected to the hydraulic oil tank 1.

[0080] The first working port of the boom working valve 3 is connected to the rod chamber of the boom cylinder 10 via the A1 port of the integrated valve, and the second working port of the boom working valve 3 is connected to the rodless chamber of the boom cylinder 10 via the B1 port of the integrated valve.

[0081] The first working port of the breaker valve 7 is connected to the rodless chamber of the boom cylinder 10 via the A2 port of the integrated valve, and the second working port of the breaker valve 7 is connected to the oil inlet of the breaker hammer 8 via the B2 port of the integrated valve.

[0082] The hydraulic oil in the rodless chamber of the boom cylinder 10 can flow back to the hydraulic oil tank 1 through two paths. Firstly, when the boom working valve 3 is in the second working position, the hydraulic oil in the rodless chamber of the boom cylinder 10 can flow back to the hydraulic oil tank 1 via the boom working valve 3. At this time, the excavator's boom is propelled by oil entering the rod chamber of the boom cylinder 10, causing the boom cylinder 10 to retract, thus lowering the excavator's boom and pressing down on the hydraulic breaker. This mode is consistent with the working principle of a conventional hydraulic breaker, which can accommodate the operator's operating habits and improve the product's adaptability. Secondly, when the breaker working valve 7 is in the first working position, the hydraulic oil in the rodless chamber of the boom cylinder 10 can flow back to the hydraulic oil tank 1 through the breaker working valve 7. At this time, the excavator boom descends under its own weight, pressing down the breaker. In this mode, no additional flow is required, reducing engine power consumption and improving fuel economy. In addition, the excavator boom is in a free state, and the vibration generated by the breaker will not be transmitted to the frame, improving operating comfort and the life of the machine's structural components.

[0083] In some embodiments, the system further includes a boom control valve 4, a crushing control valve 5, and a mode switching valve 6. The boom control valve 4 is connected to both the first control terminal and the second control terminal of the boom working valve 3. The boom control valve 4 is configured as a boom control signal source to control both the first and second control terminals of the boom working valve 3. Specifically, the control method is as follows: when the boom control valve 4 is not operated, i.e., when neither the first nor the second control terminal of the boom working valve 3 receives a boom control signal, the boom working valve 3 is in its initial position; when the boom control valve 4 sends a boom control signal to the first control terminal of the boom working valve 3, and the first control terminal receives a boom control signal, the boom working valve 3 is controlled to be in its first working position; when the boom control valve 4 sends a boom control signal to the second control terminal of the boom working valve 3, and the second control terminal receives a boom control signal, the boom working valve 3 is controlled to be in its second working position. The boom control signal can be an electrical signal or a hydraulic pressure signal.

[0084] The inlet of the mode switching valve 6 is connected to the crushing control valve 5, the return port of the mode switching valve 6 is connected to the hydraulic oil tank 1, the first working port of the mode switching valve 6 is connected to the second control terminal of the crushing working valve 7, and the second working port of the mode switching valve 6 is connected to the first control terminal of the crushing working valve 7. The mode switching valve 6 includes an initial position and a working position. When the mode switching valve 6 is in the initial position, the inlet of the mode switching valve 6 is connected to the second working port of the mode switching valve 6, and the return port of the mode switching valve 6 is connected to the first working port of the mode switching valve 6. When the mode switching valve 6 is in the working position, the inlet of the mode switching valve 6 is connected to the first working port of the mode switching valve 6, and the return port of the mode switching valve 6 is connected to the second working port of the mode switching valve 6.

[0085] The crushing control valve 5 is configured as a crushing control signal source to control the first control terminal and the second control terminal of the crushing working valve 7. Specifically, the control method is as follows: when the crushing control valve 5 is not operated, i.e., when neither the first nor the second control terminal of the crushing working valve 7 receives a crushing control signal, the crushing working valve 7 is in the initial position; when the control mode switching valve 6 is in the initial position, the crushing control valve 5 sends a crushing control signal to the first control terminal of the crushing working valve 7, and when a crushing control signal is input to the first control terminal of the crushing working valve 7, the crushing working valve 7 is controlled to be in the first working position; when the control mode switching valve 6 is in the working position, the crushing control valve 5 sends a crushing control signal to the second control terminal of the crushing working valve 7, and when a crushing control signal is input to the second control terminal of the crushing working valve 7, the crushing working valve 7 is controlled to be in the second working position. The crushing control signal is a hydraulic pressure signal.

[0086] In some embodiments, the mode switching valve 6 includes a first control terminal and a second control terminal; the first control terminal of the mode switching valve 6 is provided with a spring, and the first control terminal of the mode switching valve 6 is configured to control the mode switching valve 6 to be in an initial position; the second control terminal of the mode switching valve 6 is provided with an electromagnetic component, and the second control terminal of the mode switching valve 6 is configured to control the mode switching valve 6 to be in a working position. When the second control terminal of the mode switching valve 6 is not energized, the valve core of the mode switching valve 6, under the action of the spring force at the first control terminal of the mode switching valve 6, keeps the mode switching valve 6 in the initial position; when the second control terminal of the mode switching valve 6 is energized, the valve core of the mode switching valve 6 overcomes the spring resistance at the first control terminal of the mode switching valve 6, keeping the mode switching valve 6 in the working position.

[0087] In some embodiments, the return end of the hydraulic breaker 8 is connected to the hydraulic oil tank 1, and shut-off valves 9 are provided on the pipeline between the return end of the hydraulic breaker 8 and the hydraulic oil tank 1, as well as on the pipeline between the inlet end of the hydraulic breaker 8 and the second working port of the breaking valve 7; when the hydraulic breaker 8 is in operation, all shut-off valves 9 are in the open state. During maintenance, the oil circuit is cut off by the shut-off valves 9 to prevent environmental pollution.

[0088] In some embodiments, an overflow valve 11 is provided between the oil outlet of the main pump 2 and the hydraulic oil tank 1. The overflow valve 11 limits the maximum pressure of the entire circuit to ensure the safety of the system.

[0089] The present invention also provides a control method for a hydraulic system, including the hydraulic system described in any one of the above claims.

[0090] In the first breaking condition, neither the first nor the second control terminal of the boom working valve 3 receives a boom control signal, keeping the boom working valve 3 in its initial position. The first control terminal of the breaking working valve 7 receives a breaking control signal, placing the breaking working valve 7 in its first working position. Hydraulic oil introduced by the main pump 2 flows through the inlet and second working port of the breaking working valve 7 to the inlet of the breaker hammer 8, supplying oil to the breaker hammer 8. Hydraulic oil in the rodless chamber of the boom cylinder 10 flows through the first working port and the return port of the breaking working valve 7 to the hydraulic oil tank 1. The excavator's boom descends, and the breaker hammer 8 performs the breaking operation. In this mode, no additional flow is required, reducing engine power consumption and improving fuel economy. Furthermore, with the excavator's boom in a free state, the vibration generated by the breaker hammer's operation is not transmitted to the chassis, improving operational comfort and the lifespan of the machine's structural components.

[0091] In the second crushing condition, the second control terminal of the boom working valve 3 receives a boom control signal, controlling the boom working valve 3 to be in the second working position; the second control terminal of the crushing working valve 7 receives a crushing control signal, and the crushing working valve 7 is in the second working position. The hydraulic oil introduced by the main pump 2 is divided into two paths. One path of hydraulic oil flows through the inlet and the second working port of the crushing working valve 7 to the inlet of the breaker hammer 8, supplying oil to the breaker hammer 8. The other path of hydraulic oil flows through the inlet and the first working port of the boom working valve 3 to the rod chamber of the boom cylinder 10, supplying oil to the rod chamber of the boom cylinder 10. The hydraulic oil in the rodless chamber of the boom cylinder 10 flows through the second working port and the return port of the boom working valve 3 to the hydraulic oil tank 1. The boom of the excavator descends, and the breaker hammer 8 performs the crushing operation. This mode works on the same principle as a conventional hydraulic breaker, taking into account the operator's operating habits and improving the product's adaptability. At the same time, because the rod chamber of the boom cylinder 10 is supplied with oil, the boom cylinder 10 generates additional downward pressure on the excavator's boom, thereby increasing the hydraulic breaker's striking force.

[0092] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention shall fall within the scope of the technical solution of the present invention.

Claims

1. A hydraulic control valve assembly, characterized in that: The hydraulic control valve group, which has an oil inlet (P) and an oil outlet (T), includes a boom working valve (3) and a crushing working valve (7), wherein: The oil inlet (P) is connected to the oil inlet of the boom working valve (3) and the oil inlet of the crushing working valve (7) respectively; The oil outlet (T) is connected to the oil return port of the boom working valve (3) and the oil return port of the crushing working valve (7), respectively. The first working port of the boom working valve (3) is used to connect with the rod chamber of the boom cylinder, and the second working port of the boom working valve (3) is used to connect with the rodless chamber of the boom cylinder. The first working port of the breaker working valve (7) is used to connect with the rodless chamber of the boom cylinder, and the second working port of the breaker working valve (7) is used to connect with the oil inlet of the breaker hammer. The boom working valve (3) includes a first control terminal and a second control terminal. The first control terminal and the second control terminal of the boom working valve (3) are configured to control the boom working valve (3) to switch between an initial position, a first working position, and a second working position. In the initial position of the boom working valve (3), the oil inlet, the oil return, the first working oil port, and the second working oil port of the boom working valve (3) are all disconnected. In the first working position of the boom working valve (3), the oil inlet of the boom working valve (3) is connected to the second working oil port of the boom working valve (3), and the oil return port of the boom working valve (3) is connected to the first working oil port of the boom working valve (3); in the second working position of the boom working valve (3), the oil inlet of the boom working valve (3) is connected to the first working oil port of the boom working valve (3), and the oil return port of the boom working valve (3) is connected to the second working oil port of the boom working valve (3). The crushing working valve (7) includes a first control terminal and a second control terminal. The first control terminal and the second control terminal of the crushing working valve (7) are configured to control the crushing working valve (7) to switch between an initial position, a first working position, and a second working position. In the initial position of the crushing working valve (7), the oil inlet, the oil return port, the first working port, and the second working port of the crushing working valve (7) are all disconnected. In the first working position of the crushing working valve (7), the oil inlet of the crushing working valve (7) is connected to the second working port, and the oil return port is connected to the first working port. In the second working position of the crushing working valve (7), the oil inlet of the crushing working valve (7) is connected to the second working port, and the oil return port and the first working port of the crushing working valve (7) are both disconnected.

2. The hydraulic control valve assembly according to claim 1, characterized in that: When there is no boom control signal input at either the first control terminal or the second control terminal of the boom working valve (3), the boom working valve (3) is in the initial position. When a boom control signal is input to the first control terminal of the boom working valve (3), the boom working valve (3) is controlled to be in the first working position; When a boom control signal is input to the second control terminal of the boom working valve (3), the boom working valve (3) is controlled to be in the second working position; and, When there is no crushing control signal input at either the first control terminal or the second control terminal of the crushing working valve (7), the crushing working valve (7) is in the initial position; When a crushing control signal is input to the first control terminal of the crushing working valve (7), the crushing working valve (7) is controlled to be in the first working position; When a crushing control signal is input to the second control terminal of the crushing working valve (7), the crushing working valve (7) is controlled to be in the second working position.

3. The hydraulic control valve assembly according to claim 1 or 2, characterized in that: The boom working valve (3) is a three-position four-way valve I. The first working position, the initial position and the second working position of the boom working valve (3) are the left working position, the middle position and the right working position of the three-position four-way valve I, respectively. The crushing working valve (7) is a three-position four-way valve II. The first working position, the initial position and the second working position of the crushing working valve (7) are the left working position, the middle position and the right working position of the three-position four-way valve II, respectively.

4. The hydraulic control valve assembly according to claim 1 or 2, characterized in that: The boom working valve (3) also includes a central oil inlet and a central oil outlet, and the central oil inlet of the boom working valve (3) is connected to the oil inlet (P); The crushing working valve (7) also includes a central oil inlet and a central oil outlet. The central oil inlet of the crushing working valve (7) is connected to the central oil outlet of the boom working valve (3), and the central oil outlet of the crushing working valve (7) is connected to the oil outlet (T). When the boom working valve (3) is in the initial position and the breaker working valve (7) is also in the initial position, the oil inlet (P) is connected to the oil inlet (P) in sequence through the middle oil inlet of the boom working valve (3), the middle oil outlet of the boom working valve (3), the middle oil inlet of the breaker working valve (7) and the middle oil outlet of the breaker working valve (7).

5. The hydraulic control valve assembly according to claim 4, characterized in that: The boom working valve (3) is a three-position six-way valve I. The first working position, the initial position and the second working position of the boom working valve (3) are the left working position, the middle position and the right working position of the three-position six-way valve I, respectively. The crushing working valve (7) is a three-position six-way valve II. The first working position, the initial position and the second working position of the crushing working valve (7) are the left working position, the middle position and the right working position of the three-position six-way valve II, respectively.

6. A hydraulic system, characterized in that: Includes a hydraulic oil tank (1), a main pump (2), a hydraulic breaker (8), a boom cylinder (10), and a hydraulic control valve assembly as described in any one of claims 1-5; The oil inlet of the main pump (2) is connected to the hydraulic oil tank (1), and the oil outlet of the main pump (2) is connected to the oil inlet (P). The oil outlet (T) is connected to the hydraulic oil tank (1); The first working port of the boom working valve (3) is connected to the rod chamber of the boom cylinder (10), and the second working port of the boom working valve (3) is connected to the rodless chamber of the boom cylinder (10). The first working port of the breaker valve (7) is connected to the rodless chamber of the boom cylinder (10), and the second working port of the breaker valve (7) is connected to the oil inlet of the breaker hammer (8).

7. The hydraulic system according to claim 6, characterized in that: It also includes a boom control valve (4), a crushing control valve (5), and a mode switching valve (6); The boom control valve (4) is connected to the first control terminal and the second control terminal of the boom working valve (3) respectively; the boom control valve (4) is configured as a boom control signal source to control the first control terminal and the second control terminal of the boom working valve (3); The oil inlet of the mode switching valve (6) is connected to the crushing control valve (5), the oil return port of the mode switching valve (6) is connected to the hydraulic oil tank (1), the first working oil port of the mode switching valve (6) is connected to the second control end of the crushing working valve (7), and the second working oil port of the mode switching valve (6) is connected to the first control end of the crushing working valve (7). The mode switching valve (6) includes an initial position and a working position. When the mode switching valve (6) is in the initial position, the oil inlet of the mode switching valve (6) is connected to the second working oil port of the mode switching valve (6), and the oil return port of the mode switching valve (6) is connected to the first working oil port of the mode switching valve (6). When the mode switching valve (6) is in the working position, the oil inlet of the mode switching valve (6) is connected to the first working oil port of the mode switching valve (6), and the oil return port of the mode switching valve (6) is connected to the second working oil port of the mode switching valve (6). The crushing control valve (5) is configured as a crushing control signal source to control the first control terminal and the second control terminal of the crushing working valve (7).

8. The hydraulic system according to claim 7, characterized in that: The mode switching valve (6) includes a first control terminal and a second control terminal; The first control end of the mode switching valve (6) is provided with a spring, and the first control end of the mode switching valve (6) is configured to control the mode switching valve (6) to be in the initial position; The second control terminal of the mode switching valve (6) is provided with an electromagnetic component, and the second control terminal of the mode switching valve (6) is configured to control the mode switching valve (6) to be in the working position.

9. The hydraulic system according to claim 6, characterized in that: The return end of the hydraulic breaker (8) is connected to the hydraulic oil tank (1). A shut-off valve (9) is provided on the pipeline between the return end of the hydraulic breaker (8) and the hydraulic oil tank (1) and on the pipeline between the inlet end of the hydraulic breaker (8) and the second working oil port of the breaking working valve (7). When the hydraulic breaker (8) is breaking, all shut-off valves (9) are in the conducting state.

10. The hydraulic system according to claim 6, characterized in that: An overflow valve (11) is provided between the oil outlet of the main pump (2) and the hydraulic oil tank (1).

11. A control method for a hydraulic system, characterized in that: Including the hydraulic system according to any one of claims 6-10, Under the first crushing condition, the boom working valve (3) is controlled to be in the initial position and the crushing working valve (7) is in the first working position; the hydraulic oil introduced by the main pump (2) flows to the oil inlet end of the breaker hammer (8) through the crushing working valve (7) to supply oil to the breaker hammer (8), and the hydraulic oil in the rodless chamber of the boom cylinder (10) flows to the hydraulic oil tank (1) through the crushing working valve (7), and the breaker hammer (8) realizes the crushing operation; In the second crushing condition, the boom working valve (3) and the crushing working valve (7) are controlled to be in the second working position. The hydraulic oil introduced by the main pump (2) is divided into two paths. One path of hydraulic oil flows through the crushing working valve (7) to the oil inlet end of the breaker (8) to supply oil to the breaker (8). The other path of hydraulic oil flows through the boom working valve (3) to the rod chamber of the boom cylinder (10) to supply oil to the rod chamber of the boom cylinder (10). The hydraulic oil in the rodless chamber of the boom cylinder (10) flows through the boom working valve (3) to the hydraulic oil tank (1), and the breaker (8) performs the crushing operation.

Images