Integral structure of integrated high-pressure valve

Abstract

The utility model discloses an integral structure of an integrated high-pressure valve, and belongs to the field of control valves. According to the technical scheme, the integrated high-pressure valve overall structure comprises a valve body, and the valve body is provided with a first oil way communicated with an oil pump, a second oil way communicated with an oil tank, a third oil way communicated with a rodless cavity of an oil cylinder and a fourth oil way communicated with a rod cavity of the oil cylinder. The control of the mechanical carrier on the strong pressure lowering, natural lowering and lifting functions of the load is coupled on the main valve core, the position of the main valve core is controlled in a sliding manner to realize the switching among different functions, and the impact caused by disordered control logic during opening and closing is avoided directly through the structural characteristics of the element, so that the safety of the mechanical carrier is ensured. The system structure is simplified, the number of oil channels is reduced, the number of valve element assemblies used in the whole hydraulic system is reduced, the weight of the whole structure is reduced, the assembling difficulty is lowered, the service life of parts is prolonged, and therefore the maintenance cost and the maintenance cost are reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of control valves, and in particular relates to an integrated high-pressure valve overall structure. Background Art

[0002] At present, there are four main control modes for agricultural machinery carriers: lifting, free descent, strong pressure and floating descent, to meet the different work needs of operators. The existing control principle is that the lifting function is controlled by a cartridge valve that controls lifting, the free and floating descent functions are controlled by a cartridge valve that controls descent, and the strong pressure function is set up separately with a strong pressure module.

[0003] This design not only increases the complexity of the system, but also easily produces impacts once the control system fails, reducing the service life of components and even causing component damage. With the increasing requirements for high cost performance, simple structure and lightweight of agricultural machinery, the mode of coordinating multiple valves to control the descending working condition can no longer meet the requirements. Utility Model Content

[0004] The utility model provides an integrated high-pressure valve overall structure to solve at least one of the above technical problems.

[0005] The technical solution adopted by the utility model is:

[0006] 1. The integrated high-pressure valve structure of claim 1, comprising a valve body, wherein the valve body has a first oil circuit connected to an oil pump, a second oil circuit connected to an oil tank, a third oil circuit connected to a rodless chamber of an oil cylinder, and a fourth oil circuit connected to a rod chamber of the oil cylinder. The valve body also comprises a sliding chamber arranged in the valve body, wherein a main valve core is slidably connected in the sliding chamber, and a first conducting mechanism and a second conducting mechanism are arranged at intervals along the length direction of the main valve core. The first conducting mechanism comprises a first guide channel and a second guide channel arranged at intervals along the main valve core. When the machine is performing a high-pressure lowering action, the first guide channel connects the fourth oil circuit with the second oil circuit and the second guide channel connects the third oil circuit with the second oil circuit at the same time, so as to realize the high-pressure lowering action of the load. The second conducting mechanism comprises a third guide channel arranged on the main valve core. When the machine is performing a natural lowering action, the third guide channel connects the third oil circuit with the second oil circuit and the fourth oil circuit with the second oil circuit at the same time, so as to realize the natural lowering action of the load.

[0007] Preferably, it further comprises a third conducting mechanism arranged on the main valve core, wherein the third conducting mechanism is used to connect the first oil circuit with the third oil circuit and simultaneously connect the second oil circuit with the fourth oil circuit to realize the lifting action of the load.

[0008] Preferably, the main valve core slides along the sliding cavity to switch the machine between a strong pressure lowering action, a natural lowering action and a lifting action of the load.

[0009] Preferably, the third conducting mechanism includes a fifth guide channel and a sixth guide channel arranged along the main valve core. When the machine is performing a lifting action, the fifth guide channel connects the first oil circuit with the third oil circuit and the sixth guide channel connects the second oil circuit with the fourth oil circuit.

[0010] Preferably, the main valve core adopts an integrally formed structure.

[0011] Preferably, a compensation valve is provided on the first oil circuit, a first pilot oil circuit is connected between the first oil circuit and the compensation valve, and the compensation valve is externally connected to a load sensing system.

[0012] Preferably, a hydraulically controlled one-way valve is provided on the third oil circuit, and the hydraulically controlled one-way valve has a slidable valve core structure. The valve core structure slides to have a first position for allowing the hydraulic oil to flow from the third oil circuit to the rodless chamber in one direction and a second position for allowing the hydraulic oil in the rodless chamber to flow back to the third oil circuit. When the machine is performing a forced lowering action and / or a natural lowering action, the valve core structure slides from the first position to the second position, and when the machine is performing a lifting action, the valve core structure slides from the second position to the first position.

[0013] Preferably, a second pilot oil circuit for driving the valve core structure to slide is connected between the first oil circuit and the hydraulically controlled one-way valve.

[0014] Preferably, two fourth flow guide channels are arranged on the main valve core at intervals, and any one of the two fourth flow guide channels can communicate with the first oil circuit and the second pilot oil circuit.

[0015] Preferably, a driving motor for driving the main valve core to slide is disposed outside the main valve core.

[0016] Due to the adoption of the above technical solution, the beneficial effects achieved by the utility model are as follows:

[0017] 1. In the present application, the first conduction mechanism, the second conduction mechanism and the third conduction mechanism are integrated on the main valve core, so that the main valve core slides to a specific position in the sliding cavity to realize the oil flow direction in the hydraulic system, and then realizes the mechanical equipment's action control of the strong pressure lowering, natural lowering and lifting of the load. In the present application, the control of the mechanical vehicle's strong pressure lowering, natural lowering and lifting functions of the load is coupled to the main valve core, and the position of the main valve core is controlled by sliding to realize the switching between different functions. This control structure layout directly avoids the impact caused by the confusion of the control logic during opening and closing through the structural characteristics of the element itself, simplifies the system structure and the number of oil channels, reduces the number of valve core components used in the hydraulic system as a whole, reduces the weight of the overall structure, reduces the difficulty of assembly, and increases the service life of parts and components, thereby reducing maintenance costs and maintenance costs.

[0018] 2. As a preferred embodiment of the present invention, when the machine performs a strong pressure lowering action, the pressure oil pumped out by the oil pump enters the rod chamber of the oil cylinder through the first oil circuit, the first guide channel, and the fourth oil circuit, pushing the oil cylinder piston to move toward the rodless chamber, and then returning the hydraulic oil in the rodless chamber to the oil tank along the third oil circuit, the second guide channel, and the second oil circuit.

[0019] 3. As a preferred embodiment of the present invention, when the machine performs a natural lowering action, it is divided into two situations. One is that under the action of the load, the pressure in the rodless chamber is greater than the pressure in the rod chamber. At this time, the hydraulic oil in the oil tank enters the rodless chamber of the cylinder from the second oil circuit, the third guide channel, and the third oil circuit. At the same time, the hydraulic oil in the rod chamber flows back to the oil tank through the fourth oil circuit, the third guide channel, and the second oil circuit until a new force balance is reached; the other is that under the action of the load, the pressure in the rod chamber is greater than the pressure in the rodless chamber. At this time, the hydraulic oil in the oil tank enters the rod chamber through the second oil circuit, the third guide channel, and the fourth oil circuit. At the same time, the hydraulic oil in the rodless chamber flows back to the oil tank through the third oil circuit, the third guide channel, and the second oil circuit until a new force balance is reached, thereby realizing the natural downward action of the load.

[0020] 4. As a preferred embodiment of the present invention, when the machine performs a lifting action, the pressure oil pumped out by the oil pump enters the rodless chamber through the first oil circuit, the fifth guide channel, and the third oil circuit. At the same time, the hydraulic oil in the rod chamber flows back to the oil tank through the fourth oil circuit, the sixth guide channel, and the second oil circuit, thereby completing the lifting action of the load.

[0021] 5. As a preferred embodiment of the present invention, when the pressure oil pumped out by the oil pump passes through the first oil circuit, a part of the pressure oil is separated and flows along the first pilot oil circuit as the pilot oil of the compensation valve and the load sensing system. The setting of the compensation valve is convenient for regulating the oil pressure of the entire hydraulic system, and the setting of the load sensing system is convenient for detecting the pressure value in the oil circuit to ensure the stable operation of the hydraulic system.

[0022] 6. As a preferred embodiment of the present invention, when the machine performs a natural lowering or forced downward pressure action, the valve core structure is located in the second position, ensuring that the hydraulic oil in the rodless chamber can smoothly pass through the second guide channel of the third oil circuit and the second oil circuit to return to the oil tank; when the machine performs a lifting action, the valve core structure is located in the first position, and the one-way channel in the valve core structure can ensure that the hydraulic oil in the third oil circuit can only flow into the rodless chamber in one direction, preventing the hydraulic oil in the rodless chamber from flowing back and causing the cylinder push rod to be recovered, causing safety accidents during the lifting process, thereby improving the safety during the execution of the lifting action.

[0023] 7. As a preferred embodiment of the present invention, when the machine is performing a natural downward action or a forced downward action, one of the two fourth guide channels can connect the first oil circuit with the second pilot oil circuit, so that the pressure oil in the first oil circuit can enter the second pilot oil circuit to drive the valve core structure to slide from the first position to the second position.

[0024] 8. As a preferred embodiment of the present invention, the main valve core adopts an integrated structure, so that the mechanical strength of the main valve core is high, thereby making its service life longer, the failure rate is greatly reduced, and the maintenance cost during use is reduced. The main valve core can be driven to slide by the driving motor, so that the main valve core can be switched back and forth between lifting, natural lowering and strong pressure lowering. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the strong pressure lowering action in a specific implementation mode of the present invention;

[0026] Figure 2 This is a principle diagram of the natural lowering action in a specific implementation manner of the present invention;

[0027] Figure 3 It is a schematic diagram of the lifting action in a specific implementation manner of the present invention.

[0028] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0029] In the attached picture:

[0030] 1. Valve body; 101. Sliding chamber; 2. Main valve core; 201. First guide channel; 202. Second guide channel; 203. Third guide channel; 204. Fourth guide channel; 205. Fifth guide channel; 206. Sixth guide channel; 207. Drive motor; 3. Compensation valve; 31. First pilot oil circuit; 32. Load sensitive system; 4. Hydraulic control one-way valve; 41. Second pilot oil circuit; 11. First oil circuit; 12. Second oil circuit; 13. Third oil circuit; 14. Fourth oil circuit. DETAILED DESCRIPTION

[0031] In order to more clearly illustrate the overall concept of the present invention, a detailed description is given below in the form of examples in conjunction with the accompanying drawings.

[0032] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0033] In addition, in the description of the present invention, it should be understood that the terms "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0034] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, 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 invention can be understood according to specific circumstances.

[0035] In the present utility model, unless otherwise clearly specified and limited, the first feature "above" or "below" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the description with reference to the terms "implementation method", "example", "one embodiment", "example" or "specific example" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples.

[0036] Reference Figure 1-3, an integrated high-pressure valve overall structure, including a valve body 1, the valve body 1 has a first oil circuit 11 connected to the oil pump, a second oil circuit 12 connected to the oil tank, a third oil circuit 13 connected to the rodless chamber of the oil cylinder, and a fourth oil circuit 14 connected to the rod chamber of the oil cylinder, and also includes a sliding chamber 101 arranged in the valve body 1, a main valve core 2 is slidably connected in the sliding chamber 101, and a first conduction mechanism, a second conduction mechanism and a third conduction mechanism are arranged at intervals along the length direction of the main valve core 2, the first conduction mechanism is used to connect the fourth oil circuit 14 with the first oil circuit 11 and simultaneously connect the third The oil circuit 13 is connected with the second oil circuit 12 to realize the strong pressure lowering action of the load. The second conducting mechanism is used to connect the third oil circuit 13 with the second oil circuit 12 and simultaneously connect the fourth oil circuit 14 with the second oil circuit 12 to realize the natural lowering action of the load. The third conducting mechanism is used to connect the first oil circuit 11 with the third oil circuit 13 and simultaneously connect the second oil circuit 12 with the fourth oil circuit 14 to realize the lifting action of the load. The main valve core 2 slides along the sliding chamber 101 to switch the machine between the strong pressure lowering action, the natural lowering action and the lifting action of the load.

[0037] It can be understood by those skilled in the art that excavators and other machines control the lifting and lowering of loads through hydraulic systems and oil cylinders. Specifically, when it is necessary to forcefully lower the load, the main valve core 2 is controlled to slide along the sliding cavity 101, and the position of the first conduction mechanism is adjusted. The first conduction mechanism connects the fourth oil circuit 14 with the first oil circuit 11 and simultaneously connects the third oil circuit 13 with the second oil circuit 12. At this time, the pressure oil pumped out by the oil pump enters the rod chamber of the oil cylinder along the first oil circuit 11, the first conduction mechanism, and the fourth oil circuit 14 to press the piston in the oil cylinder to move toward the rodless chamber. At the same time, the hydraulic oil in the rodless chamber flows back to the oil tank along the third oil circuit 13 and the second oil circuit 12 under the action of negative pressure. When it is necessary to control the mechanical load to perform a natural lowering action, the main valve core 2 is controlled to slide along the sliding chamber 101, and the position of the second conducting mechanism is adjusted. The second conducting mechanism connects the third oil circuit 13 with the second oil circuit 12 and at the same time connects the fourth oil circuit 14 with the second oil circuit 12. At this time, when the hydraulic oil in the rodless chamber enters the oil tank along the third oil circuit 13 and the second oil circuit 12 due to the gravity of the load, the hydraulic oil in the oil tank is sucked from the second oil circuit 12 and the fourth oil circuit 14 into the rod chamber due to the negative pressure until the force balance is reached. Similarly, when the hydraulic oil in the rod chamber is pressed out of the oil tank along the fourth oil circuit 14 and the second oil circuit 12 due to the load, the rodless chamber sucks the hydraulic oil in the oil tank from the second oil circuit 12 and the third oil circuit 13 into the rodless chamber due to the negative pressure until the force balance is reached. When the load needs to be lifted, the main valve core 2 is controlled to slide along the sliding chamber 101, and the position of the third conduction mechanism is adjusted so that the third conduction mechanism connects the first oil circuit 11 with the third oil circuit 13 and simultaneously connects the second oil circuit 12 with the fourth oil circuit 14. At this time, the pressure oil pumped out by the oil pump enters the rodless chamber through the first oil circuit 11, the third conduction mechanism, and the third oil circuit 13. At the same time, the hydraulic oil in the rod chamber flows back to the oil tank from the fourth oil circuit 14, the third conduction mechanism, and the second oil circuit 12. The first conduction mechanism, the second conduction mechanism, and the third conduction mechanism are integrated on the main valve core 2, so that the main valve core 2 slides to a specific position in the sliding chamber 101 to realize the oil circuit flow direction in the hydraulic system, thereby realizing the mechanical equipment to control the load by forced pressure release, natural release, and lifting. The present invention couples the control of the mechanical carrier's forced pressure release, natural release, and lifting functions of the load to the main valve core 2, and realizes the switching between different functions by sliding the position of the main valve core 2. This control structure layout directly avoids the impact caused by the confusion of control logic during opening and closing through the structural characteristics of the components themselves, simplifies the system structure and the number of oil channels, reduces the number of valve core components used in the hydraulic system as a whole, reduces the weight of the overall structure, reduces the difficulty of assembly, and increases the service life of components, thereby reducing repair and maintenance costs.

[0038] As a specific implementation of the first conduction mechanism, refer to Figure 3The first conduction mechanism includes a first guide channel 201 and a second guide channel 202 which are arranged at intervals along the main valve core 2. When the machine is performing a strong pressure lowering action, the first guide channel 201 connects the fourth oil circuit 14 with the first oil circuit 11 and at the same time the second guide channel 202 connects the third oil circuit 13 with the second oil circuit 12.

[0039] When the machine performs a high-pressure lowering action, the pressure oil pumped out by the oil pump enters the rod chamber of the oil cylinder through the first oil circuit 11, the first guide channel 201, and the fourth oil circuit 14, pushing the oil cylinder piston to move toward the rodless chamber, and then returning the hydraulic oil in the rodless chamber to the oil tank along the third oil circuit 13, the second guide channel 202, and the second oil circuit 12.

[0040] As a specific implementation of the second conduction mechanism, refer to Figure 2 The second conduction mechanism includes a third guide channel 203 arranged on the main valve core 2. When the machine is performing a natural lowering action, the third guide channel 203 connects the third oil circuit 13 with the second oil circuit 12 and simultaneously connects the fourth oil circuit 14 with the second oil circuit 12.

[0041] When the machine performs a natural lowering action, there are two situations. One is that under the action of the load, the pressure in the rodless cavity is greater than the pressure in the rod cavity. At this time, the hydraulic oil in the oil tank enters the rodless cavity of the cylinder from the second oil circuit 12, the third guide channel 203, and the third oil circuit 13. At the same time, the hydraulic oil in the rod cavity flows back to the oil tank through the fourth oil circuit 14, the third guide channel 203, and the second oil circuit 12 until a new force balance is reached; the other is that under the action of the load, the pressure in the rod cavity is greater than the pressure in the rodless cavity. At this time, the hydraulic oil in the oil tank enters the rod cavity through the second oil circuit 12, the third guide channel 203, and the fourth oil circuit 14. At the same time, the hydraulic oil in the rodless cavity flows back to the oil tank through the third oil circuit 13, the third guide channel 203, and the second oil circuit 12 until a new force balance is reached, thereby realizing the natural downward action of the load.

[0042] As a specific implementation of the third conduction mechanism, refer to Figure 1 The third conducting mechanism includes a fifth guide channel 205 and a sixth guide channel 206 arranged at intervals along the main valve core 2. When the machine is performing a lifting action, the fifth guide channel 205 connects the first oil circuit 11 with the third oil circuit 13 and at the same time the sixth guide channel 206 connects the second oil circuit 12 with the fourth oil circuit 14.

[0043] When the machine performs a lifting action, the pressure oil pumped out by the oil pump enters the rodless chamber through the first oil circuit 11, the fifth guide channel 205, and the third oil circuit 13. At the same time, the hydraulic oil in the rod chamber flows back to the oil tank through the fourth oil circuit 14, the sixth guide channel 206, and the second oil circuit 12, thereby completing the lifting action of the load.

[0044] As a preferred embodiment of the present application, refer to Figure 1-3 A compensating valve 3 is provided on the first oil circuit 11 , a first pilot oil circuit 31 is connected between the first oil circuit 11 and the compensating valve 3 , and a load sensing system 32 is externally connected to the compensating valve 3 .

[0045] When the pressure oil pumped out by the oil pump passes through the first oil circuit 11, a part of the pressure oil is separated and flows along the first pilot oil circuit 31 as the pilot oil of the compensation valve 3 and the load sensing system 32. The setting of the compensation valve 3 facilitates the regulation of the oil pressure of the entire hydraulic system, and the setting of the load sensing system 32 facilitates the detection of the pressure value in the oil circuit to ensure the stable operation of the hydraulic system.

[0046] As another preferred embodiment of the present application, refer to Figure 1-3 A hydraulically controlled one-way valve 4 is provided on the third oil circuit 13. The hydraulically controlled one-way valve 4 has a slidable valve core structure. The valve core structure slides to have a first position for allowing the hydraulic oil to flow from the third oil circuit 13 to the rodless chamber in one direction and a second position for allowing the hydraulic oil in the rodless chamber to flow back to the third oil circuit 13. When the machine is performing a strong pressure lowering action and / or a natural lowering action, the valve core structure slides from the first position to the second position, and when the machine is performing a lifting action, the valve core structure slides from the second position to the first position.

[0047] When the machine performs a natural lowering or forced downward pressure action, the valve core structure is located in the second position, ensuring that the hydraulic oil in the rodless chamber can smoothly pass through the second guide channel 202 of the third oil circuit 13 and the second oil circuit 12 to flow back to the oil tank. When the machine performs a lifting action, the valve core structure is located in the first position. The one-way channel in the valve core structure can ensure that the hydraulic oil in the third oil circuit 13 can only flow into the rodless chamber in one direction, preventing the hydraulic oil in the rodless chamber from flowing back and causing the cylinder push rod to be recovered, causing safety accidents during the lifting process, thereby improving the safety during the execution of the lifting action.

[0048] Specifically, a second pilot oil circuit 41 for driving the valve core structure to slide is connected between the first oil circuit 11 and the hydraulically controlled one-way valve 4. When the mechanical self-lifting action is switched to the downward action, part of the hydraulic oil in the first oil circuit 11 flows through the second pilot oil circuit 41 to drive the valve core structure to slide from the first position to the second position, thereby connecting the two-way oil passage in the valve core structure to the third oil circuit 13.

[0049] Two fourth guide channels 204 are arranged on the main valve core 2 at intervals, and the two fourth guide channels 204 are used to connect the first oil circuit 11 with the second pilot oil circuit 41. When the machine is performing a natural downward action or a forced downward action, one of the two fourth guide channels 204 can connect the first oil circuit 11 with the second pilot oil circuit 41, so that the pressure oil in the first oil circuit 11 can enter the second pilot oil circuit 41 to drive the valve core structure to slide from the first position to the second position.

[0050] As a preferred example of the main valve core 2, the main valve core 2 adopts an integrally formed structure, so that the mechanical strength of the main valve core 2 is higher, thereby extending its service life, greatly reducing the failure rate, and reducing the maintenance cost during use.

[0051] A driving motor 207 for driving the main valve core 2 to slide is disposed outside the main valve core 2. The driving motor 207 can be used to control the main valve core 2 to slide, so that the main valve core 2 can be switched back and forth between lifting, natural lowering and strong pressure.

[0052] The parts not described in the present invention can be realized by adopting or drawing on the existing technology.

[0053] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0054] The above description is only an embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of the claims of the present invention.

Claims

1. An integrated high-pressure valve structure, comprising a valve body (1), wherein the valve body (1) has a first oil circuit (11) connected to an oil pump, a second oil circuit (12) connected to an oil tank, a third oil circuit (13) connected to a rodless chamber of an oil cylinder, and a fourth oil circuit (14) connected to a rod chamber of an oil cylinder, characterized in that: The invention also comprises a sliding chamber (101) arranged in the valve body (1), a main valve core (2) being slidably connected in the sliding chamber (101), a first conduction mechanism and a second conduction mechanism being arranged at intervals along the length direction of the main valve core (2), the first conduction mechanism comprising a first flow guide channel (201) and a second flow guide channel (202) being arranged at intervals along the main valve core (2), and when the machine is performing a strong pressure lowering action, the first flow guide channel (201) connects the fourth oil circuit (14) with the second oil circuit (12 ) is connected and at the same time the second guide channel (202) connects the third oil circuit (13) with the second oil circuit (12) to realize the strong pressure lowering action of the load, the second conduction mechanism includes a third guide channel (203) arranged on the main valve core (2), when the machine is performing a natural lowering action, the third guide channel (203) connects the third oil circuit (13) with the second oil circuit (12) and at the same time connects the fourth oil circuit (14) with the second oil circuit (12) to realize the natural lowering action of the load.

2. The integrated high-pressure valve structure according to claim 1 is characterized in that: It also includes a third conduction mechanism arranged on the main valve core (2), the third conduction mechanism being used to connect the first oil circuit (11) with the third oil circuit (13) and simultaneously connect the second oil circuit (12) with the fourth oil circuit (14) to achieve a load lifting action.

3. The integrated high-pressure valve structure according to claim 2 is characterized in that: The main valve core (2) slides along the sliding chamber (101) to switch the machine between a strong pressure lowering action, a natural lowering action and a lifting action of the load.

4. The integrated high-pressure valve structure according to claim 2 is characterized in that: The third conduction mechanism comprises a fifth flow guide channel (205) and a sixth flow guide channel (206) which are arranged at intervals along the main valve core (2). When the machine is performing a lifting action, the fifth flow guide channel (205) connects the first oil circuit (11) with the third oil circuit (13) and at the same time the sixth flow guide channel (206) connects the second oil circuit (12) with the fourth oil circuit (14).

5. The integrated high-pressure valve structure according to claim 1 is characterized in that: The main valve core (2) adopts an integrally formed structure.

6. An integrated high-pressure valve overall structure according to any one of claims 1 to 4, characterized in that: A compensation valve (3) is provided on the first oil circuit (11), a first pilot oil circuit (31) is connected between the first oil circuit (11) and the compensation valve (3), and the compensation valve (3) is externally connected to a load sensing system (32).

7. An integrated high-pressure valve overall structure according to any one of claims 1 to 4, characterized in that: The third oil circuit (13) is provided with a hydraulically controlled one-way valve (4), and the hydraulically controlled one-way valve (4) has a slidable valve core structure. The valve core structure slides to have a first position in which the hydraulic oil flows from the third oil circuit (13) to the rodless chamber in one direction, and a second position in which the hydraulic oil in the rodless chamber flows back to the third oil circuit (13). When the machine is performing a forced lowering action and / or a natural lowering action, the valve core structure slides from the first position to the second position, and when the machine is performing a lifting action, the valve core structure slides from the second position to the first position.

8. The integrated high-pressure valve structure according to claim 6, characterized in that: A second pilot oil circuit (41) for driving the valve core structure to slide is communicated between the first oil circuit (11) and the hydraulically controlled one-way valve (4).

9. The integrated high-pressure valve structure according to claim 7, characterized in that: Two fourth flow guide channels (204) are arranged on the main valve core (2) at intervals, and either of the two fourth flow guide channels (204) can connect the first oil circuit (11) with the second pilot oil circuit (41).

10. The integrated high-pressure valve structure according to claim 9, characterized in that: A driving motor (207) for driving the main valve core (2) to slide is disposed outside the main valve core (2).

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