Multi-leader logic control type double pump split-flow multi-way valve and control method

Abstract

The application discloses a kind of multi-pilot logic control type double pump split-flow multi-way valve and control method, multi-way valve includes valve body, and the valve body is provided with oil inlet P1, oil inlet P2, at least two main valve spools and control corresponding main valve spool action proportional pressure reducing valve, valve body also includes split-flow control valve spool and logic sequence valve.When the main valve spool of multi-way valve is individually operated, the pilot driving oil after proportional pressure reducing valve cannot be driven split-flow control valve spool by logic sequence valve, at this time, multi-way valve is in double pump confluence state, maximum power is used.When two or more main valve spools of multi-way valve are operated, the pilot signal oil after pressure reduction from proportional pressure reducing valve is used to push logic sequence valve spool, the pilot driving oil without proportional pressure reducing valve is pushed split-flow control valve spool after passing through logic sequence valve, at this time, multi-way valve is in split-flow state.

Description

Technical Field

[0001] This invention relates to a multi-way valve, and more particularly to a multi-pilot logic-controlled dual-pump merging and splitting multi-way valve and a method for controlling the merging and splitting of the multi-way valve. Background Technology

[0002] Hydraulic multi-way valves with dual pumps are commonly used in existing construction machinery. The main purposes are: to achieve better system energy saving and prevent significant energy loss caused by a single large-displacement oil pump; and to achieve better operational performance, as the operation of the two pumps can be controlled manually via the on / off switching of the flow control valve, resulting in better control, multi-action performance, and micro-motion capabilities. In existing technology, the main valve stem of the multi-way valve is electrically controlled by a solenoid valve (proportional pressure reducing valve), and the flow control valve core is also electrically controlled by a solenoid valve to achieve flow merging and splitting between the two pumps. This method, controlled by a PLC controller, has a fast response time. However, in practical non-electrically controlled applications, the flow control valve core cannot effectively coordinate with the main valve core, leading to difficulties in switching between flow merging and splitting between the two pumps. Summary of the Invention

[0003] To solve the above technical problems, the present invention provides a multi-pilot logic-controlled dual-pump flow splitting and merging multi-way valve and a flow splitting and merging control method for the multi-way valve, which achieves the action of the flow splitting and merging control valve core through an operation mode in which electronic control and hydraulic control coexist on the same platform.

[0004] The technical solution of the present invention is: a multi-pilot logic control dual-pump split-flow and merging multi-way valve, including a valve body, wherein the valve body is provided with an oil inlet P1, an oil inlet P2, at least two main valve cores and a proportional pressure reducing valve for controlling the action of the corresponding main valve cores, and the valve body also includes a split-flow and merging control valve core and a logic sequence valve.

[0005] The flow splitting and merging control valve core controls the merging and splitting states of oil inlet P1 and oil inlet P2 through displacement action, and the valve body has a flow splitting and merging hydraulic control inlet channel for controlling the action of the flow splitting and merging control valve core.

[0006] The logic sequence valve has a pilot oil inlet and a liquid separation control outlet. The pilot oil inlet is connected to the main pilot oil, and the liquid separation control outlet is connected to the liquid separation control inlet. The logic sequence valve also has two sequence valve cores that control the connection and disconnection of the pilot oil inlet and the liquid separation control outlet. When both sequence valve cores are activated, the pilot oil inlet is connected to the liquid separation control outlet. The logic sequence valve also has pilot oil control ports that control the activation of the two sequence valve cores respectively.

[0007] The valve body also has pilot oil control channels that are respectively connected to the outlet of each of the proportional pressure reducing valves. The pilot oil control channel corresponding to one main valve core is connected to one of the pilot oil control ports, and the pilot oil control channels corresponding to the other main valve cores are respectively connected to the other pilot oil control ports. When the main valve core is activated, after the total pilot oil passes through the corresponding proportional pressure reducing valve, a portion of the pilot oil enters the corresponding pilot oil control port through the pilot oil control channel, driving the corresponding sequence valve core to activate.

[0008] As a preferred technical solution, the logic sequence valve includes a sequence valve body, two sequence valve cores are slidably disposed in the sequence valve body, the pilot oil control port is located at one end of the sequence valve core, and a sequence valve spring is provided between the other end of the sequence valve core and the sequence valve body.

[0009] The valve body of the sequence valve has annular oil passage one and annular oil passage two corresponding to one of the sequence valve cores. Annular oil passage one is connected to the pilot oil inlet. After the sequence valve core is activated, annular oil passage one and annular oil passage two are connected. The valve body of the sequence valve has annular oil passage three and annular oil passage four corresponding to the other sequence valve core. Annular oil passage four is connected to the liquid control outlet oil passage. After the sequence valve core is activated, annular oil passage three and annular oil passage four are connected. A valve core connecting oil passage connects annular oil passage two and annular oil passage three.

[0010] As a preferred technical solution, the sequence valve body is further provided with a liquid return channel, which is connected to the liquid control inlet channel and also connected to the return oil tank. When both sequence valve cores operate simultaneously, the liquid return channel is cut off from the return oil tank. When one or both sequence valve cores do not operate, the liquid return channel is connected to the return oil tank.

[0011] As a preferred technical solution, the valve body of the sequence valve has annular oil passage five and annular oil passage six corresponding to one of the sequence valve cores. Annular oil passage six is ​​connected to the return oil tank. After the sequence valve core is activated, annular oil passage five and annular oil passage six are blocked. The valve body of the sequence valve has annular oil passage seven and annular oil passage eight corresponding to the other sequence valve core. Annular oil passage seven and annular oil passage eight are connected. Annular oil passage eight is connected to the return oil tank. After the sequence valve core is activated, annular oil passage seven and annular oil passage eight are connected. Annular oil passage five and annular oil passage seven are connected and are also connected to the separation and combination liquid return oil passage.

[0012] As a preferred technical solution, the valve body is provided with an oil inlet channel one connected to the oil inlet P1 and an oil inlet channel two connected to the oil inlet P2. The split-flow control oil inlet channel is located at one end of the split-flow control valve core. A split-flow control valve spring is provided between the other end of the split-flow control valve core and the valve body. When the split-flow control valve core is not activated, the oil inlet channel one and the oil inlet channel two are connected, and the oil inlet P1 and the oil inlet P2 are in a merged state. After the split-flow control valve core is activated, the oil inlet channel one and the oil inlet channel two are cut off, and the oil inlet P1 and the oil inlet P2 are in a split state.

[0013] As a preferred technical solution, a proportional pressure reducing valve is provided on the left and right sides of the main valve core, and a pilot oil control oil passage is provided at the outlet of the two proportional pressure reducing valves. A control shuttle valve is provided on each pilot oil control oil passage, and the outlets of the two control shuttle valves are connected through an auxiliary oil circuit. The pilot oil control port is connected to the auxiliary oil circuit.

[0014] Another preferred technical solution and control method employs a multi-pilot logic controlled dual-pump merging / splitting multi-way valve:

[0015] When any main valve core is activated, the total pilot oil passes through the corresponding proportional pressure reducing valve and enters the working chamber of the corresponding main valve core. At the same time, a portion of the pilot oil is taken as pilot signal oil and enters the corresponding pilot oil control port through the pilot oil control oil passage to drive the corresponding sequence valve core to activate.

[0016] When no pilot signal oil enters from either of the two pilot oil control ports, neither of the two sequence valve cores will operate, the pilot oil inlet will be cut off from the split-flow control outlet, the split-flow control valve core will not operate, and the inlet P1 and inlet P2 will be in a merged state.

[0017] When pilot signal oil enters one pilot oil control port and pushes the corresponding sequence valve core to actuate, the other sequence valve core does not actuate. The pilot oil inlet and the split / combination hydraulic control outlet are cut off. The pilot drive oil from the total pilot oil cannot enter the split / combination hydraulic control inlet. The split / combination flow control valve core does not actuate, and inlet P1 and inlet P2 are in a confluence state.

[0018] When pilot signal oil enters both pilot oil control ports, driving both sequence valve cores to actuate, the pilot oil inlet is connected to the split-flow control outlet. Pilot drive oil from the main pilot oil enters the split-flow control inlet through the pilot oil inlet and the split-flow control outlet, driving the split-flow control valve core to actuate. The inlet P1 and inlet P2 switch from the confluence state to the split state.

[0019] Due to the adoption of the above technical solution, when the total pilot oil after pressure reduction by the proportional pressure reducing valve drives the main valve core, a portion of the pilot signal oil is simultaneously used to drive the valve core of the logic sequence valve. The pilot drive oil that has not been pressure-reduced by the proportional pressure reducing valve drives the flow splitting and merging control valve core through the activated logic sequence valve, thus realizing the dual-pump confluence and diversion function of multi-pilot logic control. When one of the main valve cores of the multi-way valve operates alone, the pilot drive oil that has not been pressure-reduced by the proportional pressure reducing valve cannot drive the flow splitting and merging control valve core through the logic sequence valve. At this time, the multi-way valve is in a dual-pump confluence state, with maximum power consumption. When two or more main valve cores of the multi-way valve operate, the pilot signal oil after pressure reduction from the proportional pressure reducing valve drives the valve core of the logic sequence valve. The pilot drive oil that has not been pressure-reduced by the proportional pressure reducing valve drives the flow splitting and merging control valve core through the activated logic sequence valve. At this time, the multi-way valve is in a diversion state.

[0020] The beneficial effects of this invention are as follows: This invention achieves the merging and splitting control of the hydraulic control valve core through hydraulic control. It uses the action of the main valve core to control the valve core action of the logic sequence valve, and realizes the dual-pump merging and splitting function with multiple pilot logic control through the logical control relationship between multiple main valve cores and the two valve cores of the logic sequence valve. In the prior art, the hydraulic control valve for merging and splitting mainly uses electronic control to achieve merging and splitting. The main valve stem is electronically controlled. If hydraulic control is used on the same platform, it is impossible to control the merging and splitting control valve core. However, this invention can better realize the hydraulic control of merging and splitting by adding a logic sequence valve. It allows the electronic control and hydraulic control of the main valve core to coexist on the same platform, realizing a mechanical merging and splitting control with extremely fast micro-motion response. Moreover, its cost is slightly lower than that of the electronic control method. Attached Figure Description

[0021] The following figures are intended only to illustrate and explain the present invention and do not limit the scope of the invention. Wherein:

[0022] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention;

[0023] Figure 2 This is a hydraulic schematic diagram of an embodiment of the present invention;

[0024] Figure 3 yes Figure 2 Enlarged view of a local structure in the image;

[0025] Figure 4 This is a schematic diagram of the pilot control in an embodiment of the present invention;

[0026] Figure 5 This is a schematic diagram of the confluence state before the flow splitting and merging control valve core of this invention is activated;

[0027] Figure 6 This is a schematic diagram of the flow splitting state after the flow splitting and merging control valve core is activated according to an embodiment of the present invention.

[0028] Figure 7 This is a schematic diagram of the logic sequence valve when a certain main valve core is activated according to an embodiment of the present invention;

[0029] Figure 8 This is a schematic diagram of the logic sequence valve when two or more main valve cores are activated according to an embodiment of the present invention.

[0030] Figure 9 This is a schematic diagram of the recirculation structure according to an embodiment of the present invention;

[0031] Figure 10 This is another embodiment of a logic sequence valve;

[0032] Figure 11 yes Figure 10 Hydraulic schematic diagram;

[0033] In the diagram: 1-Valve body; 2-First main valve core; 3-Second main valve core; 4-Third main valve core; 5-Proportional pressure reducing valve; 6-Flow splitting and merging control valve core; 7-Logic sequence valve; 71-Sequence valve body; 72-Annular oil passage one; 73-Annular oil passage two; 74-Annular oil passage three; 75-Annular oil passage four; 76-Valve core connecting oil passage; 77-Flow splitting and merging fluid return oil passage; 78-Annular oil passage five; 79-Annular oil passage six; 710-Annular oil passage seven; 711-Annular oil passage eight; 8-Separation and combination hydraulic control inlet oil passage; 9-Inlet oil passage one; 10-Inlet oil passage two; 11-Separation and combination valve spring; 12-Pilot oil inlet; 13-Separation and combination hydraulic control outlet oil passage; 14-First sequence valve core; 15-Second sequence valve core; 16-First pilot oil control port; 17-Second pilot oil control port; 18-First sequence valve spring; 19-Second sequence valve spring; 20-Pilot oil control passage; 21-Control shuttle valve. Detailed Implementation

[0034] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the following detailed description, only certain exemplary embodiments of the invention are described by way of illustration. Undoubtedly, those skilled in the art will recognize that various modifications can be made to the described embodiments without departing from the spirit and scope of the invention. Therefore, the drawings and description are illustrative in nature and not intended to limit the scope of the claims.

[0035] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0036] Example 1:

[0037] like Figure 1 and Figure 2 As shown, the multi-pilot logic-controlled dual-pump merging and splitting multi-way valve includes a valve body 1. The valve body 1 is provided with an oil inlet P1, an oil inlet P2, a first main valve core 2, a second main valve core 3, a third main valve core 4, and a proportional pressure reducing valve 5 that controls the operation of the corresponding main valve cores. The valve body 1 also includes a merging and splitting control valve core 6 and a logic sequence valve 7. In this embodiment, the multiple main valve cores can be combined into a valve body by multiple valve plates. The number of first main valve cores 2 is not limited to three, but can be more, at least two.

[0038] See Figure 2 and Figure 4 The valve body 1 also has a pilot oil control passage 20 that is connected to the outlet of each of the proportional pressure reducing valves 5. The pilot oil control passage 20 corresponding to the first main valve core 2 is connected to the first pilot oil control port 16. The pilot oil control passages 20 corresponding to the second main valve core 3 and the third main valve core 4 are connected to the second pilot oil control port 17. The pilot oil inlet 12 is directly connected to the main pilot oil. When any main valve core is activated, the total pilot oil passes through the corresponding proportional pressure reducing valve and then enters the working chamber of the corresponding main valve core through the damping orifice. At the same time, a portion of the pilot oil is taken as pilot signal oil and enters the corresponding pilot oil control port through the pilot oil control passage to drive the corresponding sequence valve core to activate.

[0039] See Figure 2 and Figure 4Each main valve core has a proportional pressure reducing valve 5 on its left and right sides. These valves control the corresponding main valve core to move left or right; their control principle is existing technology and will not be elaborated here. A pilot oil control channel 20 is provided at the outlet of each of the two proportional pressure reducing valves 5. A control shuttle valve 21 is correspondingly provided on each pilot oil control channel 20. The outlets of the two control shuttle valves 21 are connected via an auxiliary oil circuit. The pilot oil control port is connected to the auxiliary oil circuit and then to the pilot oil control port of the sequence valve core. The pilot oil is always present inside the valve body 1. The main pilot oil, after passing through the proportional pressure reducing valve 5, pushes the main valve core to move. Simultaneously, a portion of the pilot oil is taken as pilot signal oil and passes through the pilot oil control channel 20 to open the corresponding control shuttle valve 21. This signal oil then enters the corresponding pilot oil control port through the auxiliary oil circuit to control the movement of the corresponding sequence valve core. Since the pilot oil inlet 12 is directly connected to the main pilot oil, pilot oil is always present at the pilot oil inlet 12, and it is named pilot drive oil. In this embodiment, both pilot signal oil and pilot drive oil come from the main pilot oil. Because they are taken from different locations and play different roles, they are named separately.

[0040] See Figure 2 , Figure 5 and Figure 6 The flow splitting and merging control valve core 6 controls the merging and splitting states of oil inlets P1 and P2 through displacement action. The valve body 1 has a flow splitting and merging hydraulic control inlet channel 8 that controls the action of the flow splitting and merging control valve core 6. The valve body 1 is provided with an inlet channel 9 communicating with oil inlet P1 and an inlet channel 10 communicating with oil inlet P2. The flow splitting and merging hydraulic control inlet channel 8 is located at one end of the flow splitting and merging control valve core 6, and a flow splitting and merging valve spring 11 is provided between the other end of the flow splitting and merging control valve core 6 and the valve body 1.

[0041] When the hydraulic inlet channel 8 is not receiving oil, the pressure in the right chamber of the flow control valve core 6 is relatively low. Under the action of the flow control valve spring 11, the flow control valve core 6 remains stationary in the right position. At this time, the annular groove on the valve core surface opens the logic port between inlet channel 1 9 and inlet channel 2 10, connecting inlet channel 1 9 and inlet channel 2 10. Inlet ports P1 and P2 are in a confluence state. (See the confluence state section for details.) Figure 3 When oil enters the hydraulic inlet channel 8, the pressure in the right chamber increases, overcoming the elastic force of the valve spring 11 and pushing the flow control valve core 6 to the left position. The valve core closes the logic port between inlet channel 1 9 and inlet channel 2 10, thus cutting off inlet port 1 and inlet port 2. Inlet port P1 and inlet port P2 are in a flow-dividing state. (See the flow-dividing state section.) Figure 4In this embodiment, oil inlet P1 and oil inlet P2 belong to different oil sources.

[0042] See Figure 3 , Figure 7 and Figure 8 This is a schematic diagram of a logic sequence valve, which is a two-position four-way valve. The logic sequence valve 7 has a pilot oil inlet 12 and a liquid control outlet 13. The pilot oil inlet 12 is directly connected to the main pilot oil, so there is always pilot drive oil at the pilot oil inlet 12. The liquid control outlet 13 is connected to the liquid control inlet 8. The logic sequence valve 7 also has two sequence valve cores that control the connection and disconnection between the pilot oil inlet 12 and the liquid control outlet 13. When both sequence valve cores are activated... The pilot oil inlet 12 is connected to the liquid control outlet 13. The logic sequence valve 7 also has pilot oil control ports that control the operation of the two sequence valve cores respectively. For ease of description, the two sequence valve cores are defined as the first sequence valve core 14 and the second sequence valve core 15. The pilot oil control ports are defined as the first pilot oil control port 16 and the second pilot oil control port 17. The first pilot oil control port 16 is used to control the operation of the first sequence valve core 14, and the second pilot oil control port 17 is used to control the operation of the second sequence valve core 15. When no pilot signal oil enters from either the first pilot oil control port 16 or the second pilot oil control port 17, neither the first sequence valve core 14 nor the second sequence valve core 15 actuates. The pilot oil inlet 12 is closed to the separating / combining fluid control passage 13, the separating / combining flow control valve core 6 actuates, and inlets P1 and P2 are in a combined flow state. When pilot signal oil enters from either the first pilot oil control port 16 or the second pilot oil control port 17, pushing the corresponding sequence valve core to actuate, the other sequence valve core actuates. The pilot oil inlet 12 is closed to the separating / combining fluid control passage 13, and pilot drive oil cannot enter. When the flow control valve core 6 is not activated, the inlet P1 and inlet P2 are in a combined flow state. When pilot signal oil enters both the first pilot oil control port 16 and the second pilot oil control port 17, pushing the first sequence valve core 14 and the second sequence valve core 15 to activate, the pilot oil inlet 12 is connected to the flow control outlet 13. Pilot drive oil enters the flow control inlet 8 through the pilot oil inlet 12 and the flow control outlet 13, driving the flow control valve core 6 to activate, and the inlet P1 and inlet P2 switch from a combined flow state to a separate flow state.

[0043] The logic sequence valve 7 includes a sequence valve body 71, a first sequence valve core 14 and a second sequence valve core 15, both of which are slidably disposed within the sequence valve body 71. A first pilot oil control port 16 is located at one end of the first sequence valve core 14, and a first sequence valve spring 18 is provided between the other end of the first sequence valve core 14 and the sequence valve body 71. A second pilot oil control port 17 is located at one end of the second sequence valve core 15, and a second sequence valve spring 19 is provided between the other end of the second sequence valve core 15 and the sequence valve body 71.

[0044] The valve body 71 of the sequence valve is provided with annular oil passage 1 72 and annular oil passage 2 73 corresponding to the valve core 15 of the second sequence valve. The annular oil passage 1 72 is connected to the pilot oil inlet 12. When the second pilot oil control port 17 is not receiving oil, the pressure in the lower chamber of the second sequence valve core 15 is small. The second sequence valve core 15 remains stationary in the lower position under the action of the second sequence valve spring 19. At this time, the valve core closes the logic port between the annular oil passage 1 72 and the annular oil passage 2 73, so that the annular oil passage 1 72 and the annular oil passage 2 73 are cut off. When oil enters the second pilot oil control port 17, the pressure in the lower chamber increases, overcoming the elastic force of the second sequence valve spring 19 and the pressure in the upper chamber, pushing the second sequence valve core 15 to be moved upward to the upper position. At this time, the annular groove on the surface of the valve core opens the logic port between the annular oil passage 1 72 and the annular oil passage 2 73, so that the annular oil passage 1 72 and the annular oil passage 2 73 are connected.

[0045] The valve body 71 of the sequence valve is provided with annular oil passage three 74 and annular oil passage four 75 corresponding to the valve core 14 of the first sequence valve. The annular oil passage four 75 is connected to the liquid control oil passage 13. The annular oil passage two 73 and the annular oil passage three 74 are connected by a valve core connecting oil passage 76. When no oil enters the first pilot oil control port 16, the pressure in the lower chamber of the first sequence valve core 14 is relatively small. Under the action of the first sequence valve spring 18, the first sequence valve core 14 remains stationary in the lower position. At this time, the valve core closes the logic port between the third annular oil passage 74 and the fourth annular oil passage 75, thus cutting off the connection between the third annular oil passage 74 and the fourth annular oil passage 75. When pilot signal oil enters the first pilot oil control port 16, the pressure in the lower chamber increases, overcoming the elastic force of the first sequence valve spring 18 and pushing the first sequence valve core 14 upward to the upper position. At this time, the annular groove on the surface of the valve core opens the logic port between the third annular oil passage 74 and the fourth annular oil passage 75, thus connecting the third annular oil passage 74 and the fourth annular oil passage 75.

[0046] This embodiment has multiple control modes, specifically:

[0047] Mode 1: The first main valve core 2, the second main valve core 3, and the third main valve core 4 all remain inactive.

[0048] At this time, no pilot signal oil enters the pilot oil control passage 20, so no pilot signal oil enters the first pilot oil control port 16 and the second pilot oil control port 17. The first sequence valve core 14 and the second sequence valve core 15 do not operate. The pilot drive oil inlet 12 is cut off from the split and merge liquid control passage 13. The split and merge flow control valve core 6 does not operate. At this time, the oil inlet P1 and the oil inlet P2 are in a merged state, that is, the multi-way valve is in a dual-pump merged state.

[0049] Mode 2: The first main valve core 2 is activated, while the second main valve core 3 and the third main valve core 4 are not activated.

[0050] When the first main valve core 2 is activated, the pilot signal oil opens the corresponding control shuttle valve 21 through the pilot oil control oil passage 20, and enters the corresponding first pilot oil control port 16 through the auxiliary oil passage, pushing the first sequence valve core 14 to activate, so that the annular oil passage 3 74 and the annular oil passage 4 75 are connected; however, since the second main valve core 3 or the third main valve core 4 is not activated at this time, the second sequence valve core 15 is not activated. At this time, the annular oil passage 1 72 and the annular oil passage 2 73 are cut off, the pilot oil inlet 12 and the split-and-comb liquid control outlet oil passage 13 are cut off, the pilot drive oil at the pilot oil inlet 12 cannot enter the split-and-comb liquid control inlet oil passage 8, the split-and-comb flow control valve core 6 is not activated, and at this time the oil inlet P1 and the oil inlet P2 are in a confluence state, that is, the multi-way valve is in a dual-pump confluence state.

[0051] Mode 3: The first main valve core 2 does not operate; one of the second main valve core 3 and the third main valve core 4 operates, or both operate simultaneously.

[0052] When at least one of the second main valve core 3 and the third main valve core 4 is activated, the pilot signal oil opens the corresponding control shuttle valve 21 through the pilot oil control oil passage 20, and enters the corresponding second pilot oil control port 17 through the auxiliary oil passage, pushing the second sequence valve core 15 to activate, so that the annular oil passage 1 72 and the annular oil passage 2 73 are connected. The pilot drive oil enters the annular oil passage 3 74 through the pilot oil inlet 12, the annular oil passage 1 72, the annular oil passage 2 73, and the valve core connecting oil passage 76. However, since the first main valve core 2 is not activated at this time, the annular oil passage 3 74 and the annular oil passage 4 75 are cut off, and the pilot drive oil cannot enter the split and merge hydraulic control inlet oil passage 8. The split and merge flow control valve core 6 is not activated. At this time, the oil inlet P1 and the oil inlet P2 are in a merged state, that is, the multi-way valve is in a dual-pump merged state.

[0053] Mode 4: The first main valve core 2 is activated, and one or both of the second main valve core 3 and the third main valve core 4 are activated simultaneously.

[0054] When the first main valve core 2 is activated, pilot signal oil flows through pilot oil control passage 20 to open the corresponding control shuttle valve 21, and enters the corresponding first pilot oil control port 16 through the auxiliary oil passage, pushing the first sequence valve core 14 to activate, thus connecting the annular oil passage 3 74 and the annular oil passage 4 75; when at least one of the second main valve core 3 and the third main valve core 4 is activated, pilot signal oil flows through pilot oil control passage 20 to open the corresponding control shuttle valve 21, and enters the corresponding second pilot oil control port 17 through the auxiliary oil passage, pushing the first sequence valve core 14 to activate, thus connecting the annular oil passage 3 74 and the annular oil passage 4 75. When the valve core 15 of the second sequence valve is activated, the annular oil passage 1 72 and the annular oil passage 2 73 are connected. At this time, the pilot drive oil passes through the pilot oil inlet 12, annular oil passage 1 72, annular oil passage 2 73, valve core connecting oil passage 76, annular oil passage 3 74, annular oil passage 4 75, and the split-flow control oil passage to enter the split-flow control inlet oil passage 8. This pushes the split-flow control valve core 6 to move to the left position. At this time, the oil inlet P1 and oil inlet P2 switch from the flow-merging state to the flow-dividing state. At this time, the multi-way valve is in the flow-dividing state.

[0055] When the first main valve core 2 remains in action and either the second main valve core 3 or the third main valve core 4 remains in action, the flow splitting and merging control valve core 6 also remains in the flow splitting state. When the first main valve core 2 returns to the neutral position and the second main valve core 3 or the third main valve core 4 remains in action, the flow splitting and merging control valve core 6 switches from the flow splitting state to the flow merging state. When the first main valve core 2 remains in action and the second main valve core 3 or the third main valve core 4 simultaneously returns to the neutral position, the flow splitting and merging control valve core 6 switches from the flow splitting state to the flow merging state.

[0056] After the pressurized oil flows through the confluence or separation of inlet P1 and inlet P2, it enters the valve body 1 and passes through the first main valve core, the second main valve core, and the third main valve core before being discharged from the working port to meet different operational needs.

[0057] In this embodiment, the first main valve core 2 corresponds to the oil circuit of the first sequence valve core 14, controlling the operation of the first sequence valve core 14. The second main valve core 3 and the third main valve core 4 correspond to the oil circuit of the second sequence valve core 15, controlling the operation of the second sequence valve core 15. Alternatively, the oil circuits of the first main valve core 2 and the second sequence valve core 15 can correspond, and the second main valve core 3 and the third main valve core 4 can correspond to the first sequence valve core 14; or the oil circuits of the second main valve core 3 and the first sequence valve core 14 can correspond, and the oil circuits of the first main valve core 2 and the third main valve core 4 can correspond to the second sequence valve core 15; or the oil circuits of the second main valve core 3 and the second sequence valve core 15 can correspond, and the first main valve core 2 and the third main valve core 4 can correspond to the first sequence valve core 14. The main requirement is that one main valve core corresponds to one sequence valve core, and the remaining main valve cores correspond to the other sequence valve cores.

[0058] See Figure 9The sequence valve body 71 is also provided with a liquid return passage 77, which is connected to the liquid control inlet passage 8 and is also connected to the return oil tank. When the valve cores of the two sequence valves operate simultaneously, the liquid return passage 77 is cut off from the return oil tank. When one or two valve cores of the sequence valves do not operate, the liquid return passage 77 is connected to the return oil tank.

[0059] See Figure 9 The sequence valve body 71 has annular oil passage 5 78 and annular oil passage 6 79 corresponding to one of the sequence valve cores. Annular oil passage 6 is connected to the return oil tank. After the sequence valve core is activated, annular oil passage 5 78 and annular oil passage 6 79 are blocked. The sequence valve body 71 has annular oil passage 710 and annular oil passage 8 711 corresponding to another sequence valve core. Annular oil passage 710 and annular oil passage 8 711 are connected. Annular oil passage 8 711 is connected to the return oil tank. After the sequence valve core is activated, annular oil passage 710 and annular oil passage 8 711 are connected. Annular oil passage 5 78 and annular oil passage 710 are connected and are also connected to the separation and combination liquid return oil passage 77.

[0060] Example 2:

[0061] This embodiment is basically the same as Embodiment 1 in structure and principle, the main difference being the number of main valve cores. In this embodiment, there are two main valve cores, namely a first main valve core 2 and a second main valve core 3. The first main valve core 2 has an oil circuit corresponding to the first sequence valve core 14, and the second main valve core 3 has an oil circuit corresponding to the second sequence valve core 15. That is, when the first main valve core 2 is activated, the first sequence valve core 14 is activated, the second main valve core 3 is activated, and the second sequence valve core 15 is activated.

[0062] Of course, the first main valve core 2 can also correspond to the second sequence valve core 15, and the second main valve core 3 can correspond to the first sequence valve core 14.

[0063] Example 3:

[0064] This embodiment is basically the same as Embodiment 1 in structure and principle, the main difference being the number of main valve cores. In this embodiment, there are four main valve cores: a first main valve core 2, a second main valve core 3, a third main valve core 4, and a fourth main valve core. The first main valve core 2 corresponds to the first sequence valve core 14, and the second, third, and fourth main valve cores correspond to the second sequence valve core 15. That is, when the first main valve core 2 is activated, the first sequence valve core 14 is activated; when one or more of the second, third, fourth, and fourth main valve cores are activated, the second sequence valve core 15 is activated.

[0065] Example 4:

[0066] This embodiment is basically the same in structure and principle as Embodiment 1. The main difference is that the logic sequence valve has a different structure. The logic sequence valve in Embodiment 1 is a two-position four-way valve, while the logic sequence valve in this embodiment is a two-position three-way valve. See [link to documentation]. Figure 10 and Figure 11 .

[0067] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A multi-pilot logic-controlled dual-pump merging and splitting multi-way valve, comprising a valve body, wherein the valve body is provided with an oil inlet P1, an oil inlet P2, at least two main valve cores, and a proportional pressure reducing valve for controlling the operation of the corresponding main valve cores, characterized in that: The valve body also includes a flow splitting and merging control valve core and a logic sequence valve; The flow splitting and merging control valve core controls the merging and splitting states of oil inlet P1 and oil inlet P2 through displacement action, and the valve body has a flow splitting and merging hydraulic control inlet channel for controlling the action of the flow splitting and merging control valve core. The logic sequence valve has a pilot oil inlet and a liquid separation control outlet. The pilot oil inlet is connected to the main pilot oil, and the liquid separation control outlet is connected to the liquid separation control inlet. The logic sequence valve also has two sequence valve cores that control the connection and disconnection of the pilot oil inlet and the liquid separation control outlet. When both sequence valve cores are activated, the pilot oil inlet is connected to the liquid separation control outlet. The logic sequence valve also has pilot oil control ports that control the activation of the two sequence valve cores respectively. The valve body also has pilot oil control channels that are respectively connected to the outlet of each of the proportional pressure reducing valves. The pilot oil control channel corresponding to one main valve core is connected to one of the pilot oil control ports, and the pilot oil control channels corresponding to the other main valve cores are respectively connected to the other pilot oil control ports. When the main valve core is activated, after the total pilot oil passes through the corresponding proportional pressure reducing valve, a portion of the pilot oil enters the corresponding pilot oil control port through the pilot oil control channel, driving the corresponding sequence valve core to activate.

2. The multi-pilot logic-controlled dual-pump merging and splitting multi-way valve as described in claim 1, characterized in that: The logic sequence valve includes a sequence valve body, two sequence valve cores are slidably disposed in the sequence valve body, the pilot oil control port is located at one end of the sequence valve core, and a sequence valve spring is provided between the other end of the sequence valve core and the sequence valve body. The valve body of the sequence valve has annular oil passage one and annular oil passage two corresponding to one of the sequence valve cores. Annular oil passage one is connected to the pilot oil inlet. After the sequence valve core is activated, annular oil passage one and annular oil passage two are connected. The valve body of the sequence valve has annular oil passage three and annular oil passage four corresponding to the other sequence valve core. Annular oil passage four is connected to the liquid control outlet oil passage. After the sequence valve core is activated, annular oil passage three and annular oil passage four are connected. A valve core connecting oil passage connects annular oil passage two and annular oil passage three.

3. The multi-pilot logic-controlled dual-pump merging and splitting multi-way valve as described in claim 2, characterized in that: The sequence valve body is also provided with a liquid return channel, which is connected to the liquid control inlet channel and also connected to the return oil tank. When both sequence valve cores operate simultaneously, the liquid return channel is cut off from the return oil tank. When one or both sequence valve cores do not operate, the liquid return channel is connected to the return oil tank.

4. The multi-pilot logic-controlled dual-pump merging and splitting multi-way valve as described in claim 3, characterized in that: The sequence valve body has annular oil passage five and annular oil passage six corresponding to one of the sequence valve cores. Annular oil passage six is ​​connected to the return oil tank. After the sequence valve core is activated, annular oil passage five and annular oil passage six are blocked. The sequence valve body has annular oil passage seven and annular oil passage eight corresponding to the other sequence valve core. Annular oil passage seven and annular oil passage eight are connected. Annular oil passage eight is connected to the return oil tank. After the sequence valve core is activated, annular oil passage seven and annular oil passage eight are connected. Annular oil passage five and annular oil passage seven are connected and are also connected to the separation and combination liquid return oil passage.

5. The multi-pilot logic-controlled dual-pump merging and splitting multi-way valve as described in claim 1, characterized in that: The valve body is provided with an oil inlet channel one connected to oil inlet P1 and an oil inlet channel two connected to oil inlet P2. The split-flow control oil inlet channel is located at one end of the split-flow control valve core. A split-flow control valve spring is provided between the other end of the split-flow control valve core and the valve body. When the split-flow control valve core is not activated, oil inlet channel one and oil inlet channel two are connected, and oil inlet P1 and oil inlet P2 are in a merged state. After the split-flow control valve core is activated, oil inlet channel one and oil inlet channel two are cut off, and oil inlet P1 and oil inlet P2 are in a split state.

6. The multi-pilot logic-controlled dual-pump merging and splitting multi-way valve as described in claim 1, characterized in that: A proportional pressure reducing valve is provided on each of the left and right sides of the main valve core. A pilot oil control channel is provided at the outlet of each of the two proportional pressure reducing valves. A control shuttle valve is provided on each of the pilot oil control channels. The outlets of the two control shuttle valves are connected through an auxiliary oil circuit. The pilot oil control port is connected to the auxiliary oil circuit.

7. A control method, employing the multi-pilot logic control dual-pump merging / splitting multi-way valve as described in any one of claims 1 to 6, characterized in that: When any main valve core is activated, the main pilot oil passes through the corresponding proportional pressure reducing valve and enters the working chamber of the corresponding main valve core. At the same time, a portion of the pilot oil is taken as pilot signal oil and enters the corresponding pilot oil control port through the pilot oil control oil passage to drive the corresponding sequence valve core to activate. When no pilot signal oil enters from either of the two pilot oil control ports, neither of the two sequence valve cores will operate, the pilot oil inlet will be cut off from the split-flow control outlet, the split-flow control valve core will not operate, and the inlet P1 and inlet P2 will be in a merged state. When pilot signal oil enters one pilot oil control port and pushes the corresponding sequence valve core to actuate, the other sequence valve core does not actuate. The pilot oil inlet and the split / combination hydraulic control outlet are cut off. The pilot drive oil from the total pilot oil cannot enter the split / combination hydraulic control inlet. The split / combination flow control valve core does not actuate, and inlet P1 and inlet P2 are in a confluence state. When pilot signal oil enters both pilot oil control ports, driving both sequence valve cores to actuate, the pilot oil inlet is connected to the split-flow control outlet. Pilot drive oil from the main pilot oil enters the split-flow control inlet through the pilot oil inlet and the split-flow control outlet, driving the split-flow control valve core to actuate. The inlet P1 and inlet P2 switch from the confluence state to the split state.

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