Control valve group with independent valve core, hydraulic system and operation machine

Abstract

The utility model relates to a hydraulic control system, and provides a control valve group with an independent valve core, a hydraulic system and an operating machine, the valve group comprises a first main oil way, a second main oil way, a reversing valve and a valve core independent structure, and the valve core independent structure comprises a first main valve, a second main valve, a third main valve and a fourth main valve. The oil inlet and oil return relation switching of the two working oil ports can be achieved through the two sets of main valves, under the condition that one set of main valves breaks down, the other set of main valves which do not break down are switched to supply oil to the two working oil ports and return oil to the two working oil ports, and the oil inlet and oil return relation switching of the two working oil ports is achieved through the reversing valve. And emergency control is realized under the condition of no shutdown, so that the actuator continues to operate, and the operation progress is not delayed.

Description

Technical Field

[0001] The utility model relates to a hydraulic system, in particular to a control valve group with an independent valve core, a hydraulic system and an operating machine. Background Art

[0002] In various construction machinery, agricultural machinery, walking machinery and other operating machinery, hydraulic valves are key components in the hydraulic transmission control of the operating machinery, controlling the various actuators to operate according to the target instructions. However, as the equipment works longer and operates under harsh conditions, the hydraulic valve core becomes stuck and the action does not execute, which seriously affects the construction progress and even causes safety accidents.

[0003] In the prior art, hydraulic valves in hydraulic control systems are usually equipped with emergency handles on both sides. When the valve core is stuck and the action is not executed, the valve core movement is controlled by manually pulling the handle, thereby controlling the operation of the actuator. However, hydraulic control systems usually use a reversing valve core to control the action execution of the actuator. Therefore, when the reversing valve core is stuck, the machine needs to be stopped to solve the problem of the valve core sticking, which delays the progress of the operation. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a control valve group with an independent valve core, a hydraulic system and an operating machine, which can realize emergency control without stopping the machine and delaying the operation progress when a valve core fails.

[0005] In order to solve the above technical problems, the utility model provides a control valve group with independent valve core, comprising:

[0006] The first main oil circuit;

[0007] The second main oil circuit;

[0008] a reversing valve, used to selectively connect the first main oil circuit to one of an oil inlet circuit and an oil return circuit, and to connect the second main oil circuit to the other of the oil inlet circuit and the oil return circuit;

[0009] A valve core independent structure, the valve core independent structure includes a first main valve, a second main valve, a third main valve and a fourth main valve, the two ends of the first main valve are respectively connected to the first main oil circuit and the first working oil port, the two ends of the second main valve are respectively connected to the second main oil circuit and the first working oil port, the two ends of the third main valve are respectively connected to the first main oil circuit and the second working oil port, and the two ends of the fourth main valve are respectively connected to the second main oil circuit and the second working oil port.

[0010] In some specific embodiments, it also includes a pilot oil circuit, a first solenoid valve, a second solenoid valve, a third solenoid valve and a fourth solenoid valve, wherein two ends of the first solenoid valve are respectively connected to the pilot oil circuit and the pilot control end of the first main valve, two ends of the second solenoid valve are respectively connected to the pilot oil circuit and the pilot control end of the second main valve, two ends of the third solenoid valve are respectively connected to the pilot oil circuit and the pilot control end of the third main valve, and two ends of the fourth solenoid valve are respectively connected to the pilot oil circuit and the pilot control end of the fourth main valve.

[0011] In some specific embodiments, a shuttle valve is further included, wherein a comparison oil port of the shuttle valve is respectively connected to the first main oil circuit and the second main oil circuit, and an oil outlet of the shuttle valve is connected to the pilot oil circuit.

[0012] In some specific implementations, a fixed-value pressure reducing valve is provided between the shuttle valve and the pilot oil circuit.

[0013] In some specific embodiments, the first solenoid valve, the second solenoid valve, the third solenoid valve and the fourth solenoid valve are all electric proportional pressure reducing valves.

[0014] In some specific embodiments, it also includes a pilot oil return circuit, a first overflow oil supply valve and a second overflow oil supply valve, the two ends of the first overflow oil supply valve are respectively connected to the first working oil port and the pilot oil return circuit, the two ends of the second overflow oil supply valve are respectively connected to the second working oil port and the pilot oil return circuit, the pilot oil return circuit is connected to the oil tank, and the oil unloading ports of the fixed value pressure reducing valve, the first solenoid valve, the second solenoid valve, the third solenoid valve and the fourth solenoid valve are all connected to the pilot oil return circuit.

[0015] In some specific implementations, the first main valve, the second main valve, the third main valve, and the fourth main valve are all electric proportional flow control valves.

[0016] In some specific embodiments, it also includes a first hydraulically controlled one-way valve and a second hydraulically controlled one-way valve, the one-way stop end of the first hydraulically controlled one-way valve is connected to the first working oil port, the one-way conducting end of the first hydraulically controlled one-way valve is respectively connected to the first main valve, the second main valve and the control end of the second hydraulically controlled one-way valve, the one-way stop end of the second hydraulically controlled one-way valve is connected to the second working oil port, and the one-way conducting end of the second hydraulically controlled one-way valve is respectively connected to the third main valve, the fourth main valve and the control end of the first hydraulically controlled one-way valve.

[0017] In some specific embodiments, the reversing valve is an electromagnetic reversing valve.

[0018] A second aspect of the utility model provides a hydraulic system, comprising:

[0019] The above valve core independent control valve group;

[0020] A hydraulic pump connected to the oil inlet circuit;

[0021] An oil tank connected to the oil return line;

[0022] An actuator, wherein an oil inlet of the actuator is connected to one of the first working oil port and the second working oil port, and an oil return port of the actuator is connected to the other of the first working oil port and the second working oil port.

[0023] In some specific embodiments, an electric proportional relief valve is further included, and two ends of the electric proportional relief valve are respectively connected to the oil inlet circuit and the oil tank.

[0024] A third aspect of the utility model provides an operating machine, comprising the above-mentioned control valve group with independent valve core.

[0025] Through the above scheme, the beneficial effects of the utility model are as follows:

[0026] The valve core independent mechanism of the utility model is provided with a first main valve, a second main valve, a third main valve and a fourth main valve, and the valve cores of the four main valves are controlled respectively to form a dual control scheme to realize the oil inlet and return switching of the first working oil port and the second working oil port, and control the actuator to execute different action instructions. When the main valve corresponding to one of the control schemes fails, for example, the valve core is stuck and the valve core control fails, the control scheme cannot control the operation of the actuator. At this time, the main valve corresponding to the other control scheme can be used to control the actuator to operate normally, and the direction of the actuator can be controlled in cooperation with the reversing valve, so as to realize emergency control without stopping the machine, without delaying the operation progress and improving the operation efficiency.

[0027] Other features and advantages of the present invention will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention, but do not constitute a limitation to the present invention. In the accompanying drawings:

[0029] Figure 1 It is a hydraulic principle diagram of a specific embodiment of the control valve group with independent valve core of the utility model;

[0030] Figure 2 It is an emergency control flow chart of a specific embodiment of the control valve group with independent valve core of the utility model.

[0031] Description of Reference Numerals

[0032] 1. Electric proportional relief valve; 2. Hydraulic pump; 3. Inlet and outlet oil reversing valve; 4. Fixed value pressure reducing valve; 5.1. First solenoid valve; 5.2. Second solenoid valve; 5.3. Third solenoid valve; 5.4. Fourth solenoid valve; 6. Shuttle valve; 7.1. First overflow oil replenishing valve; 7.2. Second overflow oil replenishing valve; 8. First main valve; 9. Second main valve; 10.1. First hydraulically controlled non-return valve; 10.2. Second hydraulically controlled non-return valve; 11. Third main valve; 12. Fourth main valve; 13.1. First pressure sensor; 13.2. Second pressure sensor; 14. Telescopic cylinder; 100. First main oil circuit; 200. Second main oil circuit; 300. Pilot oil circuit; 400. Pilot return oil circuit; 500. First working oil circuit; 600. Second working oil circuit. DETAILED DESCRIPTION

[0033] The specific implementation modes of the present invention are described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation modes described herein are only used to illustrate and explain the present invention, and the protection scope of the present invention is not limited to the specific implementation modes described below.

[0034] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "formed", "provided with", "set", "connected" and the like should be understood in a broad sense. For example, the connection can be a direct connection or an indirect connection through an intermediate medium, a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate connection member, and it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0035] In the present utility model, in the absence of corresponding explanations, the directions or positional relationships indicated by the directional words "up", "down", "left", "right", "counterclockwise", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only used to facilitate the description of the present utility model and simplify the description, rather than to indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present utility model; the directional terms of the present utility model should be understood in conjunction with the actual installation state.

[0036] The first exemplary embodiment of the utility model provides a control valve group with independent valve cores, see Figure 1The valve group includes a first main oil circuit 100, a second main oil circuit 200, a reversing valve 3 and a valve core independent structure. The valve core independent structure includes a first main valve 8, a second main valve 9, a third main valve 11 and a fourth main valve 12. The two ends of the first main valve 8 are respectively connected to the first main oil circuit 100 and the first working oil port A, the two ends of the second main valve 9 are respectively connected to the second main oil circuit 200 and the first working oil port A, the two ends of the third main valve 11 are respectively connected to the first main oil circuit 100 and the second working oil port B, and the two ends of the fourth main valve are respectively connected to the second main oil circuit 200 and the second working oil port B. By independently controlling the above four main valves, a dual control scheme for the actuator can be formed. Specifically, as a first main valve control scheme, the first main valve 8 and the fourth main valve 12 can be controlled to be in a connected state at the same time. The second main valve 9 and the third main valve 11 are in the cut-off state at the same time, so that the first main oil circuit 100 is connected to the first working oil port A through the first main valve 8, and the second main oil circuit 200 is connected to the second working oil port B through the fourth main valve 12; as a second main valve control scheme, the second main valve 9 and the third main valve 11 are controlled to be in the connected state at the same time, and the first main valve 8 and the fourth main valve 12 are in the cut-off state at the same time, so that the first main oil circuit 100 is connected to the second working oil port B through the third main valve 11, and the second main oil circuit 200 is connected to the first working oil port A through the second main valve 9; therefore, when the first main oil circuit 100 and the second main oil circuit 200 are connected to the oil inlet circuit and the oil return circuit respectively, the corresponding main valve control scheme can be selected according to the action instruction of the telescopic cylinder 14 to control the flow and direction.

[0037] In the control process of the above-mentioned valve core independent structure, there may be a situation where the first main valve 8 and / or the fourth main valve 12 fails, or the second main valve 9 and / or the third main valve 11 fails, for example, the failure is the failure of valve core control caused by valve core jamming. In this regard, the utility model is provided with a reversing valve 3, which connects the oil inlet oil circuit, the oil return oil circuit, the first main oil circuit 100 and the second main oil circuit 200, so as to selectively connect the first main oil circuit 100 to one of the oil inlet oil circuit and the oil return oil circuit, and connect the second main oil circuit 200 to the other of the oil inlet oil circuit and the oil return oil circuit. Specifically, see Figure 1The hydraulic pump 2 is connected to the reversing valve 3 through the oil inlet circuit, the oil tank is connected to the reversing valve 3 through the oil inlet circuit, the first main oil circuit 100 is connected to the reversing valve 3 through the oil inlet port P, and the second main oil circuit 200 is connected to the reversing valve 3 through the oil return port T. The reversing valve 3 can control the reversing of the inlet and return circuits between the first main oil circuit 100 and the second main oil circuit 200, and when the reversing valve 3 swaps the inlet and return circuits, the connection and cutoff states between the first main valve 8 and the second main valve 9 are swapped, and the connection and cutoff states between the third main valve 11 and the fourth main valve 12 are swapped, so as to realize the switching between the first main valve control scheme and the second main valve control scheme, thereby adopting another control scheme in which the valve core is not stuck, cooperating with the switching of the inlet and return circuits between the first main oil circuit 100 and the second main oil circuit 200, to control the flow and direction of the actuator, so that the actuator continues to work normally without stopping, does not delay the construction progress, and improves work efficiency. In addition, when applied to special working scenarios, for example, when the system is applied to a boom hydraulic valve, the main valve is installed on the boom, and the boom is in mid-air, so it is difficult for the operator to contact the boom hydraulic valve. At this time, the operator does not need to directly contact the hydraulic valve on the boom, but only needs to control the reversing valve 3 to switch the oil circuit to achieve emergency control.

[0038] by Figure 1 Taking the retraction action of the telescopic cylinder 14 as an example, the reversing valve 3 is in the right position, the first main oil circuit 100 is connected to the hydraulic pump 2 to form an oil inlet circuit, and the second main oil circuit 200 is connected to the oil tank to form an oil return circuit. At this time, the first main valve 8 and the fourth main valve 12 are controlled to be in a connected state, and the second main valve 9 and the third main valve 11 are in a closed state, so that the first main oil circuit 100 is connected to the first working oil port A through the first main valve 8 to realize the oil inlet of the rod chamber of the telescopic cylinder 14, and the second main oil circuit 100 is connected to the second working oil port B through the fourth main valve 12 to realize the oil return of the rodless chamber of the telescopic cylinder 14. When the valve core of the first main valve 8 or the fourth main valve 12 is stuck, the reversing valve 3 is controlled to be in the left position, so that The first main oil circuit 100 and the second main oil circuit 200 switch with each other, the first main oil circuit 100 is connected to the oil tank to form an oil return circuit, the second main oil circuit 200 is connected to the hydraulic pump 2 to form an oil inlet circuit, and the connection cut-off state between the first main valve 8 and the second main valve 9 is swapped, so that the second main oil circuit 200 is connected to the first working oil port A through the second main valve 9 to realize the oil inlet of the rod chamber of the telescopic cylinder 14, and the first main oil circuit 100 is connected to the second working oil port B through the third main valve 11 to realize the oil return of the rodless chamber of the telescopic cylinder 14, so as to ensure the normal operation of the retraction action of the telescopic cylinder 14, and if the subsequent telescopic cylinder 14 needs to perform an extension action, the reversing valve 3 can be controlled to switch to the right position to realize the direction switching.

[0039] The valve cores of the above-mentioned first main valve 8, second main valve 9, third main valve 11 and fourth main valve 12 are independently controlled without manual operation. As a first specific implementation method of the valve core control of the main valve, the first main valve 8, the second main valve 9, the third main valve 11 and the fourth main valve 12 are all pilot solenoid valves, and their valve core control is achieved by electrical signals. Preferably, the first main valve 8, the second main valve 9, the third main valve 11 and the fourth main valve 12 are all electric proportional flow control valves, so as to achieve proportional control of the flow.

[0040] In different application scenarios, the magnitude of the driving force for controlling the movement of the valve cores of the first main valve 8, the second main valve 9, the third main valve 11 and the fourth main valve 12 may be different. In the case where the required driving force is large, the magnitude of the electromagnetic force in the first embodiment may not meet the demand. In this regard, as a second specific embodiment of the valve core control of the main valve, see Figure 1 The utility model further includes a pilot oil circuit 300, a first solenoid valve 5.1, a second solenoid valve 5.2, a third solenoid valve 5.3 and a fourth solenoid valve 5.4. The first main valve 8, the second main valve 9, the third main valve 11 and the fourth main valve 12 are all pilot hydraulic control valves. The two ends of the first solenoid valve 5.1 are respectively connected to the pilot oil circuit 300 and the pilot control end of the first main valve 8, the two ends of the second solenoid valve 5.2 are respectively connected to the pilot oil circuit 300 and the pilot control end of the second main valve 9, the two ends of the third solenoid valve 5.3 are respectively connected to the pilot oil circuit 300 and the pilot control end of the third main valve 11, and the two ends of the fourth solenoid valve 5.4 are respectively connected to the pilot oil circuit 300 and the pilot control end of the fourth main valve 12. The solenoid valves (5.1~5.4) are controlled based on the current signal, so that the pilot oil pressure in the pilot oil circuit 300 can push the valve core of the above-mentioned main valve to move.

[0041] The pilot oil circuit 300 can be connected to an external high-pressure oil to form a pilot oil pressure, or the oil pressure in the first main oil circuit 100 or the second main oil circuit 200 can be introduced to form a pilot oil pressure, see Figure 1 The utility model further comprises a shuttle valve 6, the comparison oil port of the shuttle valve 6 is respectively connected to the first main oil circuit 100 and the second main oil circuit 200, and the oil outlet of the shuttle valve 6 is connected to the pilot oil circuit 300. When the reversing valve 3 switches the inlet and return oil circuits, the inlet oil pressure in the first main oil circuit 100 and the second main oil circuit 200 can always be introduced into the pilot oil circuit 300 through the shuttle valve 6, so as to control the pilot control ends of the first main valve 8, the second main valve 9, the third main valve 11 and the fourth main valve 12.

[0042] See also Figure 1A fixed-value pressure reducing valve 4 is arranged between the shuttle valve 6 and the pilot oil circuit 300. The high-pressure inlet oil pressure in the first main oil circuit 100 and the second main oil circuit 200 is reduced by the fixed-value pressure reducing valve 4 and converted into a pilot oil with a constant pressure and output to the oil inlet end of the first solenoid valve 5.1, the second solenoid valve 5.2, the third solenoid valve 5.3 and the fourth solenoid valve 5.4 to stably control the movement of the valve core of the main valve.

[0043] As a preferred embodiment, the first solenoid valve 5.1, the second solenoid valve 5.2, the third solenoid valve 5.3 and the fourth solenoid valve 5.4 are all electric proportional pressure reducing valves, so that the valve core opening of the electric proportional pressure reducing valve can be controlled based on the current control signal to control the oil pressure acting on the pilot control end of the main valve, thereby controlling the valve core opening of the main valve and controlling the flow rate of the main valve to achieve speed control of the actuator.

[0044] See also Figure 1 The utility model further comprises a pilot oil return circuit 400, a first overflow oil replenishing valve 7.1 and a second overflow oil replenishing valve 7.2. The pilot oil return circuit 400 is connected to the oil tank via a pilot oil return port Y. Both ends of the first overflow oil replenishing valve 7.1 are respectively connected to the first working oil port and the pilot oil return circuit 400. Both ends of the second overflow oil replenishing valve 7.2 are respectively connected to the second working oil port and the pilot oil return circuit 400. The first overflow oil replenishing valve 7.1 and the second overflow oil replenishing valve 7.2 can limit the working pressure of the first working oil port A and the second working oil port B, and replenish oil when the working pressure is too low, thereby playing a protective role. Furthermore, the oil discharge ports of the fixed value pressure reducing valve 4, the first solenoid valve 5.1, the second solenoid valve 5.2, the third solenoid valve 5.3 and the fourth solenoid valve 5.4 are all connected to the pilot oil return circuit 400, thereby improving the integration.

[0045] See also Figure 1 The utility model further comprises a first hydraulically controlled one-way valve 10.1 and a second hydraulically controlled one-way valve 10.2, wherein the one-way stop end of the first hydraulically controlled one-way valve 10.1 is connected to the first working oil port A, the one-way conducting end of the first hydraulically controlled one-way valve 10.1 is respectively connected to the first main valve 8, the second main valve 9 and the control end of the second hydraulically controlled one-way valve 10.2 through the first working oil circuit 500, the one-way stop end of the second hydraulically controlled one-way valve 10.2 is connected to the second working oil port B, the one-way conducting end of the second hydraulically controlled one-way valve 10.2 is respectively connected to the third main valve 11, the fourth main valve 12 and the control end of the first hydraulically controlled one-way valve 10.1 through the second working oil circuit 600, so that the first hydraulically controlled one-way valve 10.1 and the second hydraulically controlled one-way valve 10.2 cooperate to form a hydraulic lock for realizing the self-locking function when the actuator is not in motion.

[0046] It should be noted that there are multiple control modes for the reversing valve 3. As a first control mode, the reversing valve 3 is an electromagnetic reversing valve, so that the movement of its valve core is controlled by an electrical signal. The electrical signal can be used in conjunction with a sensor for detecting valve core jamming to achieve automatic emergency control in the event of valve core jamming. For example, the sensor can be a displacement sensor for detecting valve core displacement information or action information of the telescopic cylinder 14, or, see Figure 1 , the sensor is a first pressure sensor 13.2 for monitoring the oil pressure of the first working oil circuit 500 and a second pressure sensor 13.2 for monitoring the oil pressure of the second working oil circuit 600, and then determines whether the valve core is in a control failure state. When the valve core has not moved to the position or the telescopic cylinder 14 has not acted, the signal is fed back, so that the reversing valve 3 is controlled by an electrical signal to switch the inlet and return oil circuits; as a second control method, the reversing valve 3 can control the movement of the valve core by manually operating the joystick, and the reversing valve 3 can be set on a structure that is convenient for operators to access. For example, the reversing valve 3 can be set on the side close to the ground of the boom. Specifically, the reversing valve 3 can be installed on a part of the boom close to the ground, or installed on other structures located on the side close to the boom, such as a vehicle body, a working platform, etc. When the operator observes that the valve core is stuck, it is convenient for him to manually operate the reversing valve 3 to switch.

[0047] For easier understanding, see Figure 1 and Figure 2 The following is a description of an embodiment in which the actuator is a telescopic cylinder 14.

[0048] When the handle signal controls the telescopic cylinder 14 to retract, the reversing valve 3 controls the first main oil circuit 100 to connect to the hydraulic pump 2 for oil supply, and controls the second main oil circuit 200 to connect to the oil tank for oil return, and gives electrical signals to the first solenoid valve 5.1 and the fourth solenoid valve 5.4 to control the valve cores of the first main valve 8 and the fourth main valve 12 to open so as to be in a connected state, so that the first main oil circuit 100 realizes oil intake into the rod chamber of the telescopic cylinder 14 through the first main valve 8, and the second main oil circuit 200 realizes oil return from the rodless chamber of the telescopic cylinder 14 through the fourth main valve 12, thereby controlling the retraction of the telescopic cylinder 14. When it is detected that the telescopic cylinder 14 does not move, that is, the valve core of the first main valve 8 and / or the fourth main valve 12 is stuck, the first solenoid valve 5.1 and the fourth solenoid valve 5.4 are closed, so that the valve cores of the first main valve 8 and the fourth main valve 12 are closed to be in a cut-off state, so that the first main oil circuit 100 is disconnected from the rod chamber, the second main oil circuit 200 is disconnected from the rodless chamber, and an electrical signal is given to the reversing valve 3 to control the hydraulic pump 2 to switch to communicate with the second main oil circuit 200, and the control tank is switched to communicate with the first main oil circuit 100, and the second solenoid valve 5.2 and the third solenoid valve 5.4 are given. 3 electrical signal is used to control the valve cores of the second main valve 9 and the third main valve 11 to open and be in a connected state, so that the second main oil circuit 200 can realize oil inflow to the rod chamber through the second main valve 9, and the first main oil circuit 100 can realize oil return to the rodless chamber through the third main valve 11, so that the telescopic cylinder 14 can be continuously controlled to retract without being affected by the valve core stagnation of the first main valve 8 or the fourth main valve 12, and when the telescopic cylinder 14 needs to perform the extension action later, the reversing valve 3 can be controlled to switch the oil inlet and oil return relationship between the first working oil port A and the second working oil port B, so as to ensure the smooth execution of the extension action.

[0049] When the handle signal controls the extension of the telescopic cylinder, the reversing valve 3 controls the first main oil circuit 100 to connect to the hydraulic pump 2 for oil supply, and controls the second main oil circuit 200 to connect to the oil tank for oil return, and gives the second solenoid valve 5.2 and the third solenoid valve 5.3 electrical signals to control the valve cores of the second main valve 9 and the third main valve 11 to open so as to be in a connected state, so that the first main oil circuit 100 realizes oil inflow to the rodless chamber of the telescopic cylinder 14 through the third main valve 11, and the second main oil circuit 200 realizes oil return to the rod chamber of the telescopic cylinder 14 through the second main valve 8, thereby controlling the extension of the telescopic cylinder 14. When it is detected that the telescopic cylinder 14 does not move, that is, the valve core of the second main valve 9 and / or the third main valve 11 is stuck, the second solenoid valve 5.2 and the third solenoid valve 5.3 are closed, so that the valve cores of the second main valve 9 and the third main valve 11 are closed to be in a cut-off state, so that the first main oil circuit 100 is disconnected from the rodless chamber, the second main oil circuit 200 is disconnected from the rod chamber, and an electrical signal is given to the reversing valve 3 to control the hydraulic pump 2 to switch to communicate with the second main oil circuit 200, and the control tank is switched to communicate with the first main oil circuit 100, and the first solenoid valve 5.1 and the fourth solenoid valve 5. 4 electrical signal to control the valve cores of the first main valve 8 and the fourth main valve 12 to open and be in a connected state, so that the second main oil circuit 200 can realize oil inflow to the rodless chamber through the fourth main valve 12, and the first main oil circuit 100 can realize oil return to the rod chamber through the first main valve 8, so that the extension of the telescopic cylinder 14 can be continuously controlled without being affected by the valve core stagnation of the second main valve 9 or the third main valve 11, and when the telescopic cylinder 14 needs to perform a retraction action later, the reversing valve 3 can be controlled to switch the oil inlet and oil return relationship between the first working oil port A and the second working oil port B, so as to ensure the smooth execution of the extension action.

[0050] The utility model is based on the independent control of the four valve cores of the first main valve 8, the second main valve 9, the third main valve 11 and the fourth main valve 12, and can form two groups of main valve control schemes for the actuator, so as to select a suitable main valve control scheme for flow and direction control according to the action instruction of the actuator, and when the main valve corresponding to one of the main valve control schemes has a valve core stuck, the reversing valve 3 can switch the inlet and outlet oil circuits and cooperate to control the other group of main valves to be in a connected state, so as to perform emergency control on the actuator, so that the actuator continues to work normally, and the action direction of the actuator can be controlled by the reversing valve 3, without delaying the construction progress and improving work efficiency.

[0051] Of course, as a possible scenario, when the valve core of the second main valve 9 is stuck and the stuck position is in a connected state, the valve core of the third main valve 11 can be controlled to open, and the valve cores of the first main valve 8 and the fourth main valve 12 can be controlled to close, and the telescopic control of the telescopic cylinder 14 can be achieved by controlling the reversing valve 3, so that similar structures such as booms can be restored to a relatively safe state, such as a folded state, etc., which is convenient for operators to repair the valve core stuck fault. Similarly, when the valve cores of other main valves are stuck, the above method can also achieve the effect of fault emergency redundant control.

[0052] The second exemplary embodiment of the utility model also provides a hydraulic system, which includes a control valve group, a hydraulic pump 2, an oil tank and an actuator, the hydraulic pump 2 is connected to the oil inlet circuit, the oil tank is connected to the oil return circuit, the oil return port of the actuator is connected to one of the first working oil port and the second working oil port, and the oil return port of the actuator is connected to the other of the first working oil port and the second working oil port. The control valve group is a control valve group independent of the above-mentioned valve core, so it has all its beneficial effects and is not elaborated here. It should be noted that in order to ensure that the oil pressure of the hydraulic system is always within the safe oil pressure range, preferably, the hydraulic system also includes a relief valve, the two ends of which are respectively connected to the oil inlet circuit and the oil tank. Further preferably, the relief valve is an electric proportional relief valve 1, so that the maximum safe pressure of the oil inlet circuit can be adjusted according to actual needs.

[0053] The third exemplary embodiment of the utility model also provides a working machine, which includes the above-mentioned valve core independent control valve group, and therefore, has all its beneficial effects, which will not be repeated here. It should be noted that when the working machine is an aerial working machine, the above-mentioned valve core independent structure is installed on the boom, and preferably, the reversing valve is installed on the main body located on the ground side of the boom, and the main body can be a lower body, a working platform, etc. The operator can easily contact the reversing valve 3, so that the operator can easily contact the reversing valve 3 when the reversing valve 3 is controlled by a joystick; or, when the reversing valve 3 also fails, such as the valve core is stuck, the operator can contact the reversing valve 3 in time, so as to quickly solve the failure problem of the reversing valve 3.

[0054] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, and these simple modifications all belong to the protection scope of the present invention.

[0055] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0056] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A control valve group with independent valve core, characterized in that: include: A first main oil circuit (100); Second main oil circuit (200); a reversing valve (3) for selectively connecting the first main oil circuit (100) to one of an oil inlet circuit and an oil return circuit, and connecting the second main oil circuit (200) to the other of the oil inlet circuit and the oil return circuit; An independent valve core structure, the independent valve core structure comprising a first main valve (8), a second main valve (9), a third main valve (11) and a fourth main valve (12), wherein two ends of the first main valve (8) are respectively connected to the first main oil circuit (100) and the first working oil port, two ends of the second main valve (9) are respectively connected to the second main oil circuit (200) and the first working oil port, two ends of the third main valve (11) are respectively connected to the first main oil circuit (100) and the second working oil port, and two ends of the fourth main valve are respectively connected to the second main oil circuit (200) and the second working oil port.

2. The control valve group with independent valve core according to claim 1, characterized in that: The invention also comprises a pilot oil circuit (300), a first solenoid valve (5.1), a second solenoid valve (5.2), a third solenoid valve (5.3) and a fourth solenoid valve (5.4), wherein two ends of the first solenoid valve (5.1) are respectively connected to the pilot oil circuit (300) and the pilot control end of the first main valve (8), two ends of the second solenoid valve (5.2) are respectively connected to the pilot oil circuit (300) and the pilot control end of the second main valve (9), two ends of the third solenoid valve (5.3) are respectively connected to the pilot oil circuit (300) and the pilot control end of the third main valve (11), and two ends of the fourth solenoid valve (5.4) are respectively connected to the pilot oil circuit (300) and the pilot control end of the fourth main valve (12).

3. The control valve group with independent valve core according to claim 2, characterized in that: It also comprises a shuttle valve (6), wherein the comparison oil port of the shuttle valve (6) is respectively connected to the first main oil circuit (100) and the second main oil circuit (200), and the oil outlet of the shuttle valve (6) is connected to the pilot oil circuit (300).

4. The control valve group with independent valve core according to claim 3, characterized in that: A fixed-value pressure reducing valve (4) is provided between the shuttle valve (6) and the pilot oil circuit (300).

5. The control valve group with independent valve core according to claim 4, characterized in that: The first solenoid valve (5.1), the second solenoid valve (5.2), the third solenoid valve (5.3) and the fourth solenoid valve (5.4) are all electric proportional pressure reducing valves.

6. The control valve group with independent valve core according to claim 5, characterized in that: It also comprises a pilot oil return circuit (400), a first overflow oil replenishing valve (7.1) and a second overflow oil replenishing valve (7.2), wherein the two ends of the first overflow oil replenishing valve (7.1) are respectively connected to the first working oil port and the pilot oil return circuit (400), the two ends of the second overflow oil replenishing valve (7.2) are respectively connected to the second working oil port and the pilot oil return circuit (400), the pilot oil return circuit (400) is connected to an oil tank, and the respective oil discharge ports of the fixed value pressure reducing valve (4), the first solenoid valve (5.1), the second solenoid valve (5.2), the third solenoid valve (5.3) and the fourth solenoid valve (5.4) are all connected to the pilot oil return circuit (400).

7. The control valve assembly with independent valve core according to claim 1, characterized in that: The first main valve (8), the second main valve (9), the third main valve (11) and the fourth main valve (12) are all electric proportional flow control valves.

8. The control valve assembly with independent valve core according to any one of claims 1 to 7, characterized in that: It also comprises a first hydraulically controlled one-way valve (10.1) and a second hydraulically controlled one-way valve (10.2), wherein the one-way stop end of the first hydraulically controlled one-way valve (10.1) is connected to the first working oil port, the one-way conducting end of the first hydraulically controlled one-way valve (10.1) is respectively connected to the first main valve (8), the second main valve (9) and the control end of the second hydraulically controlled one-way valve (10.2), the one-way stop end of the second hydraulically controlled one-way valve (10.2) is connected to the second working oil port, and the one-way conducting end of the second hydraulically controlled one-way valve (10.2) is respectively connected to the third main valve (11), the fourth main valve (12) and the control end of the first hydraulically controlled one-way valve (10.1).

9. The control valve assembly with independent valve core according to any one of claims 1 to 7, characterized in that: The reversing valve (3) is an electromagnetic reversing valve.

10. A hydraulic system, characterized in that: include: A control valve group with independent valve core according to any one of claims 1 to 9; A hydraulic pump (2), connected to the oil inlet circuit; An oil tank connected to the oil return line; An actuator, wherein an oil inlet of the actuator is connected to one of the first working oil port and the second working oil port, and an oil return port of the actuator is connected to the other of the first working oil port and the second working oil port.

11. The hydraulic system according to claim 10, characterized in that: It also comprises an electric proportional overflow valve (1), the two ends of the electric proportional overflow valve (1) being respectively connected to the oil inlet circuit and the oil tank.

12. A working machine, characterized in that: A control valve group with independent valve cores comprising any one of claims 1-9.

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