Control main valve pumping system for single-pump oil supply

Abstract

The invention belongs to the technical field of hydraulic control, and particularly provides a single-pump oil supply control main valve pumping system which comprises a valve body, a tilt cylinder main reversing valve, a main cylinder main reversing valve, a priority flow valve, a first one-way valve and a three-way proportional flow valve, and the tilt cylinder main reversing valve, the main cylinder main reversing valve, the priority flow valve, the first one-way valve and the three-way proportional flow valve are arranged in the valve body. Oil of the oil inlet enters the tilt cylinder main reversing valve through the priority flow valve and the first one-way valve, oil of the oil inlet enters the master cylinder main reversing valve through the priority flow valve and the three-way proportional flow valve, and therefore stable oil supply of the tilt cylinder is guaranteed through the priority flow valve, and the tilt cylinder action is achieved through the first one-way valve without affecting a master cylinder. Flow regulation of oil supply of the main cylinder is achieved through the three-way proportional flow valve, and redundant oil is returned from an oil return path arranged on the valve body. According to the invention, a group of oil supply paths (each oil supply path comprises an oil inlet, a priority flow valve, a first one-way valve and a three-way proportional flow valve) is arranged, so that single-pump oil supply is realized.

Description

Technical Field

[0001] This invention belongs to the field of hydraulic control technology and relates to a single-pump oil supply control main valve pumping system. Background Technology

[0002] With the development and demand for mechanized operations, spraying equipment is evolving towards miniaturization and precision in applications such as building painting, spraying, and thin-layer spraying in tunnel construction, which require small-volume pumping equipment.

[0003] Piston-type "S" valve pumping mechanisms are the most commonly used pumping methods. For this type of pumping mechanism, the switching time of the "S" valve is short, generally controlled at around 0.2 seconds. Therefore, in large-volume pumping control, the swing cylinder of the "S" valve is controlled by an independent oil source and is equipped with an accumulator to provide instantaneous high flow rate to improve the switching speed of the swing cylinder. The main cylinder is required to have controllable speed, and the pumping volume is changed in real time according to construction needs. Since the switching of the main cylinder and the swing cylinder is controlled by a high-flow-rate on / off electro-hydraulic directional valve, the speed change of the main cylinder is achieved by the electronically controlled displacement of the main pump. That is, the main pump is an axial piston pump with electro-proportional displacement adjustment.

[0004] The independent oil source for the swing cylinder is adopted. On the one hand, the swing cylinder has a fast reversal and large impact, and the independent oil circuit reduces the impact on other systems. On the other hand, the characteristics of the swing cylinder's movement, with independent oil supply and the accumulator to provide instantaneous large flow, can achieve stable and controllable system and ensure the continuity of the entire pumping cycle.

[0005] As pumping mechanisms become smaller, their corresponding dimensions can be reduced proportionally, and the corresponding electro-hydraulic directional valves can also be selected with appropriate flow rates. However, the pump source cannot be matched and selected. Currently, the minimum displacement of electro-proportional axial piston pumps is 75 ml / r. When the pumping volume is 3-4 cubic meters / hour, this displacement is more than sufficient. Moreover, electro-proportional axial piston pumps are expensive, which is not conducive to cost control of small mechanical equipment. Summary of the Invention

[0006] This invention provides a single-pump oil supply control main valve pumping system, including a valve body and a swing cylinder main reversing valve, a main cylinder main reversing valve, a priority flow valve, a first check valve and a three-way proportional flow valve disposed in the valve body; The valve body is provided with an oil inlet that is connected to an external oil source, a first working oil port that is connected to the rod chamber oil port of the main cylinder group, a second working oil port that is connected to the rodless chamber oil port of the main cylinder group, a third and fourth working oil ports that are connected to the rod chamber oil port of the swing cylinder group, a fifth and sixth working oil port that are connected to the rodless chamber oil port of the swing cylinder group, and a return oil circuit that is connected to the three-way proportional flow valve. The swing cylinder main directional valve and the main cylinder main directional valve are arranged in parallel. Oil from the inlet enters the swing cylinder main directional valve through the oil passage. The swing cylinder pilot solenoid valve on the valve body controls the first valve core in the swing cylinder main directional valve to reciprocate axially, thereby distributing the oil from the inlet to the third working port, the fourth working port, the fifth working port, and the sixth working port. At the same time, oil from the inlet enters the main cylinder main directional valve through the oil passage. The main cylinder pilot solenoid valve on the valve body controls the second valve core in the main cylinder main directional valve to reciprocate axially, thereby distributing the oil from the inlet to the first working port and the second working port. The oil passage is equipped with a priority flow valve, a first check valve, and a three-way proportional flow valve. The oil in the inlet enters the main directional valve of the swing cylinder through the priority flow valve and the first check valve, and the oil in the inlet enters the main directional valve of the master cylinder through the priority flow valve and the three-way proportional flow valve. Thus, the priority flow valve ensures a stable oil supply to the swing cylinder, and the first check valve ensures that the swing cylinder action does not affect the master cylinder. The three-way proportional flow valve regulates the flow rate of the oil supplied to the master cylinder, and excess oil flow is returned through the return oil passage set on the valve body.

[0007] Furthermore, a second check valve is installed between the oil inlet and the hydraulic pump; the second check valve is used to control the connection or closure between the hydraulic pump and the oil inlet.

[0008] Furthermore, the main cylinder assembly includes a left push cylinder and a right push cylinder; the swing cylinder assembly includes a left swing cylinder and a right swing cylinder; The first working oil port is connected to the rod chamber oil port of the right push cylinder through a pipe, and the second working oil port is connected to the rodless chamber oil port of the left push cylinder through a pipe. The third working oil port is connected to the rod chamber oil port of the left swing cylinder through a pipe, and the fifth working oil port is connected to the rodless chamber oil port of the right swing cylinder through a pipe.

[0009] Furthermore, both the first and second working oil ports output high-pressure oil. The oil output from the third, fourth, fifth, and sixth working oil ports is all atmospheric pressure oil.

[0010] Furthermore, the valve body is also provided with a first pressure measuring point for measuring the oil pressure at the first working port and a second pressure measuring point for measuring the oil pressure at the second working port.

[0011] Furthermore, the return oil circuit includes a first return oil port, a second return oil port, and a third return oil port disposed on the valve body; The first return port connects the main cylinder main directional valve to the external oil tank; The second return port connects the main directional valve of the swing cylinder to the external oil tank; The third return port connects to the three-way proportional flow valve and the external oil tank.

[0012] Furthermore, the main directional valve of the swing cylinder is connected to the third working oil port and the fifth working oil port respectively, and a first valve core that can reciprocate axially moves inside the main directional valve of the swing cylinder. The first valve core reciprocates axially under the control of the swing cylinder pilot solenoid valve, so that the oil inlet port and the third working oil port are connected to supply oil. At the same time, the fifth working oil port is connected to the second return oil port provided on the valve body to return oil, thereby realizing the intermittent oil supply of the two swing cylinders in the swing cylinder group, so that the two swing cylinders in the swing cylinder group work alternately.

[0013] Furthermore, the swing cylinder main directional valve has a first oil inlet P port, a first oil return T port, a first output A port, and a first output B port; The first oil inlet P port and the first oil return T port are connected through the first oil passage in the valve body. The first oil return T port and the second oil return port are connected. The first output A port is connected to the third working oil port and the fourth working oil port through the second oil passage in the valve body. The first output B port is connected to the fifth working oil port and the sixth working oil port through the third oil passage in the valve body. Oil is introduced into the inlet and the pilot solenoid valve of the swing cylinder controls the first valve core to move, so that the oil inlet and the first output port A or the first output port B are switched to conduct, thereby allowing the third working oil port and the fifth working oil port to supply oil alternately.

[0014] Furthermore, the main cylinder main reversing valve is connected to the first working oil port and the second working oil port A2 respectively, and a second valve core that can reciprocate axially moves is fitted inside the main cylinder main reversing valve. The second valve core reciprocates axially under the control of the main cylinder pilot solenoid valve, so that the oil inlet port and the first working oil port are connected to supply oil. At the same time, the second working oil port is connected to the first return oil port provided on the valve body to return oil, thereby realizing the intermittent oil supply of the two main cylinders in the main cylinder group, so that the two main cylinders in the main cylinder group work alternately.

[0015] Furthermore, the main cylinder main directional valve has a second oil inlet P port, a second oil return T port, a second output A port, and a second output B port; The second oil inlet P port and the second oil return T port are connected through the fourth oil passage in the valve body. The second oil return T port and the second oil return port are connected. The second output A port is connected to the first working oil port through the fifth oil passage in the valve body. The second output B port is connected to the second working oil port through the sixth oil passage in the valve body. Oil is introduced into the inlet port and the pilot solenoid valve of the master cylinder controls the second valve core to operate, so that the oil inlet port and the second output port A or the second output port B are switched to conduct, thereby allowing the first working oil port and the second working oil port to supply oil alternately.

[0016] As a further embodiment of the present invention, the single-pump oil supply control main valve pumping system further includes an overflow oil circuit, wherein the overflow oil circuit includes a swing cylinder overflow assembly and a main cylinder overflow assembly disposed in the valve body. The swing cylinder overflow assembly is connected to the first return oil T port of the swing cylinder main directional valve and the accumulator through a pipeline; The main cylinder overflow assembly is connected to the second return oil T port of the main cylinder main directional valve and the external oil tank through a pipeline.

[0017] Furthermore, a third directional valve connected to the master cylinder overflow assembly is also provided on the valve body; The third directional valve is used to control the connection or disconnection between the master cylinder overflow assembly and the return oil circuit.

[0018] As a further embodiment of the present invention, the single-pump oil supply control main valve pumping system further includes an oil drain circuit. The oil drain circuit includes the third and fourth control oil return ports of the swing cylinder pilot solenoid valve, the first and second control oil return ports of the master cylinder pilot solenoid valve, and the pilot pressure reducing valve and the leakage port provided in the valve body. The first, second, third, and fourth control return ports are all connected to the pilot pressure reducing valve. The pilot pressure reducing valve is connected to the leak port through a pipeline, and the leak port is connected to the external oil tank.

[0019] Furthermore, a second directional valve is also provided on the valve body for switching the pilot pressure reducing valve and the master cylinder pilot solenoid valve. The second directional valve is used to control the connection or disconnection between the pilot pressure reducing valve and the master cylinder pilot solenoid valve.

[0020] Compared with the prior art, the present invention has the following beneficial effects: (1) The single-pump oil supply control main valve pumping system provided by the present invention achieves single-pump oil supply by setting a set of oil supply circuits (oil supply circuits include oil inlet, priority flow valve, first check valve and three-way proportional flow valve); by setting the swing cylinder main reversing valve and the main cylinder main reversing valve, the main cylinder group and the swing cylinder group are independently controlled, thereby meeting the different needs of the main cylinder group and the swing cylinder group, providing priority stable small flow to the swing cylinder, setting independent flow control for the main cylinder, and ensuring that the main and swing cylinders move independently.

[0021] (2) The independent swing cylinder control main valve proposed in this invention meets the requirements of small volume pumping system, only requires a single main pump to supply oil, and the main pump can be a conventional gear pump.

[0022] (3) The pumping system proposed in this invention uses the independent swing cylinder to control the main valve. When the main cylinder is adjusted, the excess flow is automatically stored in the oil tank, and there is no overflow or heat generation, which reduces energy loss.

[0023] (4) This invention is suitable for the miniaturization of pumping systems. The proposed independent swing cylinder control main valve and pumping system retain the performance of the independent swing cylinder itself, which requires fast swing cylinder reversal and adjustable main cylinder flow. Moreover, the cost is controllable, and the installation space and maintenance costs are greatly reduced.

[0024] In addition to the objectives, features, and advantages described above, the present invention has other objectives, features, and advantages. The invention will now be described in further detail with reference to the figures. Attached Figure Description

[0025] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a partial control principle diagram of a single-pump oil supply control main valve pumping system according to Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the overall control principle of a single-pump oil supply control main valve pumping system in Embodiment 1 of the present invention; Figure 3 This is a partial control principle diagram of a single-pump oil supply control main valve pumping system according to Embodiment 2 of the present invention; Figure 4 This is a schematic diagram of the overall control principle of a single-pump oil supply control main valve pumping system in Embodiment 2 of the present invention; Figure 5 yes Figure 4 Schematic diagram of the control principle of the oil source control valve group; Figure 6 This is a schematic diagram of the control principle of the oil source control valve group in a single-pump oil supply control main valve pumping system according to Embodiment 3 of the present invention. Detailed Implementation

[0026] To make the above-mentioned objectives, features, and advantages of the present invention clearer and easier to understand, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the accompanying drawings of the present invention are all in a simplified form and use non-precise proportions, and are only used to facilitate and clearly assist in illustrating the implementation of the present invention; the "several" mentioned in the present invention are not limited to the specific number shown in the examples in the accompanying drawings; the orientations or positional relationships indicated by terms such as "front," "middle," "rear," "left," "right," "up," "down," "top," "bottom," and "center" mentioned in the present invention are all based on the orientations or positional relationships shown in the accompanying drawings of the present invention, and do not indicate or imply that the device or component referred to must have a specific orientation, nor should they be construed as limitations on the present invention.

[0027] Example: See Figure 1As shown, the single-pump oil supply control main valve pumping system provided by the present invention includes a valve body and a swing cylinder main reversing valve 3, a main cylinder main reversing valve 5, a priority flow valve 8, a first check valve 9 and a three-way proportional flow valve 10 disposed in the valve body. The valve body is provided with an oil inlet P2 connected to an external oil source, a first working oil port A1 connected to the rod chamber oil port of the main cylinder group, a second working oil port B1 connected to the rodless chamber oil port of the main cylinder group, a third working oil port A2 and a fourth working oil port A3 connected to the rod chamber oil port of the swing cylinder group, a fifth working oil port B2 and a sixth working oil port B3 connected to the rodless chamber oil port of the swing cylinder group, and a third return oil port T3 connected to the three-way proportional flow valve 10. The valve body is equipped with a swing cylinder main directional valve 3 and a main cylinder main directional valve 5; the swing cylinder main directional valve 3 and the main cylinder main directional valve 5 are arranged in parallel; the oil in the inlet P2 enters the swing cylinder main directional valve 3 through the oil passage, and the swing cylinder pilot solenoid valve 4 set on the valve body controls the first valve core in the swing cylinder main directional valve 3 to reciprocate axially, thereby distributing the oil in the inlet P2 to the third working oil port A2, the fourth working oil port A3, the fifth working oil port B2 and the sixth working oil port B3; at the same time, the oil in the inlet P2 enters the main cylinder main directional valve 5 through the oil passage, and the main cylinder pilot solenoid valve 6 set on the valve body controls the second valve core in the main cylinder main directional valve 5 to reciprocate axially, thereby distributing the oil in the inlet P2 to the first working oil port A1 and the second working oil port B1; The oil passage is also equipped with a priority flow valve 8, a first check valve 9, and a three-way proportional flow valve 10. The oil from the inlet P2 enters the swing cylinder main reversing valve 3 through the priority flow valve 8 and the first check valve 9, and the oil from the inlet P2 enters the main cylinder main reversing valve 5 through the priority flow valve 8 and the three-way proportional flow valve 10. Thus, the priority flow valve 8 ensures a stable oil supply to the swing cylinder, and the first check valve 9 ensures that the swing cylinder action does not affect the main cylinder. The three-way proportional flow valve 10 is used to regulate the flow rate of the main cylinder oil supply, and excess oil flow is returned through the return oil passage set on the valve body.

[0028] Preferably, in this embodiment, the oil inlet P2 is connected to an external oil source via a pipeline.

[0029] In a further preferred embodiment, a second check valve 20 is provided between the oil inlet P2 and the external oil source; the second check valve 20 is used to control the connection or closure between the external oil source and the oil inlet P2.

[0030] Preferably, in this embodiment, the first working oil port A1 is connected to the rod chamber oil port of the master cylinder group through a pipe, and the second working oil port B1 is connected to the rodless chamber oil port of the master cylinder group through a pipe.

[0031] In a further preferred embodiment, the oil output from the first working oil port A1 and the second working oil port B1 is high-pressure oil.

[0032] Preferably, in this embodiment, the third working oil port A2 is connected to the rod chamber oil port of the swing cylinder assembly through a pipe, and the fifth working oil port B2 is connected to the rodless chamber oil port of the swing cylinder assembly through a pipe.

[0033] In a further preferred embodiment, the oil output from the third working oil port A2, the fourth working oil port A3, the fifth working oil port B2, and the sixth working oil port B3 is all atmospheric pressure oil.

[0034] Preferably, in this embodiment, the return oil circuit includes a first return oil port T1, a second return oil port T2, and a third return oil port T3 disposed on the valve body; The first return port T1 connects the main cylinder main reversing valve 5 and the external oil tank; The second return port T2 connects the swing cylinder main reversing valve 3 and the external oil tank; The third return port T3 connects to the three-way proportional flow valve 10 and the external oil tank.

[0035] In a further preferred embodiment, the first oil return port T1, the second oil return port T2, and the third oil return port T3 are all connected to an external oil tank via pipelines.

[0036] Preferably, in this embodiment, the valve body is further provided with a first pressure measuring point MA1 for measuring the oil pressure of the first working oil port A1 and a second pressure measuring point MA2 for measuring the oil pressure of the second working oil port B1.

[0037] Preferably, in this embodiment, the valve body is further provided with a third directional valve M3 that communicates with the main cylinder overflow assembly 7; The third directional valve M3 is used to control the connection or disconnection between the master cylinder overflow assembly 7 and the return oil circuit.

[0038] Preferably, in this embodiment, the main directional valve 3 of the swing cylinder is connected to the third working oil port A2 and the fifth working oil port B2 respectively, and a first valve core that can reciprocate axially moves inside the main directional valve 3. The first valve core reciprocates axially under the control of the swing cylinder pilot solenoid valve 4, so that the oil inlet P2 and the third working oil port A2 are connected to supply oil. At the same time, the fifth working oil port B2 is connected to the second return oil port T2 provided on the valve body to return oil, thereby realizing the intermittent oil supply of the two swing cylinders in the swing cylinder group, so that the two swing cylinders in the swing cylinder group work alternately.

[0039] Preferably, in this embodiment, the main cylinder main reversing valve 5 is connected to the first working oil port A1 and the second working oil port A2 respectively, and a second valve core that can reciprocate axially moves is fitted inside the main cylinder main reversing valve 5. The second valve core reciprocates axially under the control of the main cylinder pilot solenoid valve 6, so that the oil inlet P2 and the first working oil port A1 are connected to supply oil. At the same time, the second working oil port B1 is connected to the first return oil port T1 provided on the valve body to return oil, thereby realizing the intermittent oil supply of the two main cylinders in the main cylinder group, so that the two main cylinders in the main cylinder group work alternately.

[0040] Preferably, in this embodiment, the swing cylinder main reversing valve 3 has a first oil inlet P port, a first oil return T port, a first output A port and a first output B port; The first oil inlet P port and the first oil return T port are connected through the first oil passage in the valve body. The first oil return T port and the second oil return T2 port are connected. The first output A port is connected to the third working oil port A2 and the fourth working oil port A3 through the second oil passage in the valve body. The first output B port is connected to the fifth working oil port B2 and the sixth working oil port B3 through the third oil passage in the valve body. Oil enters through inlet P2 and the pilot solenoid valve 4 of the swing cylinder controls the first valve core to operate, so that inlet P2 is switched to conduction with the first output port A or the first output port B, thereby allowing the third working port A2 and the fifth working port B2 to supply oil alternately.

[0041] Preferably, in this embodiment, the main cylinder main reversing valve 5 has a second oil inlet P port, a second oil return T port, a second output A port, and a second output B port; The second oil inlet P port and the second oil return T port are connected through the fourth oil passage in the valve body. The second oil return T port and the second oil return port T2 are connected. The second output A port is connected to the first working oil port A1 through the fifth oil passage in the valve body. The second output B port is connected to the second working oil port B1 through the sixth oil passage in the valve body. Oil enters through inlet P2 and the master cylinder pilot solenoid valve 6 controls the second valve core to operate, so that inlet P2 is switched to the second output port A or the second output port B, thereby allowing the first working oil port A1 and the second working oil port B1 to supply oil alternately.

[0042] Preferably, in this embodiment, the method by which the first valve core moves within the main directional valve 3 of the swing cylinder to alternately supply oil to the third working oil port A2 and the fifth working oil port B2, and the method by which the second valve core moves within the main directional valve 5 of the main cylinder to alternately supply oil to the first working oil port A1 and the second working oil port B1, are existing technical means and are not described in this embodiment.

[0043] As a further embodiment of this invention, in addition to the above structure, the single-pump oil supply control main valve pumping system provided by the present invention also includes an overflow oil circuit, which includes a swing cylinder overflow assembly 2 and a main cylinder overflow assembly 7 disposed in the valve body. The swing cylinder overflow assembly 2 is connected to the first return oil T port of the swing cylinder main reversing valve 3 and the external energy storage assembly through a pipeline; The main cylinder overflow assembly 7 is connected to the second return oil T port of the main cylinder main reversing valve 5 and the external oil tank through a pipeline.

[0044] Preferably, in this embodiment, excess oil from the main reversing valve 3 of the swing cylinder flows into the external energy storage component through the first return oil port T, and excess oil from the main reversing valve 5 of the main cylinder flows into the external oil tank through the second return oil port T, so as to realize the recovery of excess oil, thereby achieving no overflow heating and reducing energy loss.

[0045] In a further preferred embodiment, a first reversing valve M1 is provided between the first return oil port T and the external energy storage component. The first reversing valve M1 is used to control the connection or disconnection between the first return oil port T and the external energy storage component.

[0046] In a further preferred embodiment, a third directional valve M3 is also provided between the second return oil port T and the external oil tank; the third directional valve M3 is used to control the connection or disconnection between the second return oil port T and the external oil tank.

[0047] In a further preferred embodiment, a pressure gauge ACC1 is also provided between the first reversing valve M1 and the external energy storage component. The pressure gauge ACC1 is used to detect the oil pressure flowing into the external energy storage component.

[0048] As a further embodiment of this invention, in addition to the above structure, the single-pump oil supply control main valve pumping system provided by the present invention also includes an oil drain circuit. The oil drain circuit includes the third control return port Y3 and the fourth control return port Y4 of the swing cylinder pilot solenoid valve 4, the first control return port Y1 and the second control return port Y2 of the main cylinder pilot solenoid valve 6, and the pilot pressure reducing valve 1 and the leakage port L provided in the valve body. The first control return port Y1, the second control return port Y2, the third control return port Y3, and the fourth control return port Y4 are all connected to the pilot pressure reducing valve 1. The pilot pressure reducing valve 1 is connected to the leak port L through a pipeline, and the leak port L is connected to the external oil tank.

[0049] Preferably, in this embodiment, the valve body is further provided with a second reversing valve M2 for switching the pilot pressure reducing valve 1 and the master cylinder pilot solenoid valve 6; The second directional valve M2 is used to control the connection or disconnection between the pilot pressure reducing valve 1 and the master cylinder pilot solenoid valve 6.

[0050] In a further preferred embodiment, the second directional valve M2 is connected to the pilot pressure reducing valve 1 and the master cylinder pilot solenoid valve 6 via a pipeline.

[0051] As a further solution to this embodiment, see Figure 2 As shown, the external oil source is pumped to the oil inlet P2 by the hydraulic oil pump 21.

[0052] Preferably, in this embodiment, the oil inlet P2 is connected to the hydraulic oil pump 21 via a pipeline.

[0053] As a further solution to this embodiment, see again Figure 2 As shown, the main cylinder group includes a left push cylinder 13 and a right push cylinder 14, and the swing cylinder group includes a left swing cylinder 11 and a right swing cylinder 12; The first working port A1 is connected to the rod chamber port of the right push cylinder 14 through a pipe, and the second working port B1 is connected to the rodless chamber port of the left push cylinder 13 through a pipe. The third working port A2 is connected to the rod chamber port of the left swing cylinder 11 through a pipe, and the fifth working port B2 is connected to the rodless chamber port of the right swing cylinder 12 through a pipe.

[0054] As a further solution to this embodiment, see again Figure 2 As shown, the single-pump oil supply control main valve pumping system provided by the present invention also includes an accumulator 19. The swing cylinder overflow assembly 2 is connected to the first return oil T port of the swing cylinder main reversing valve 3 and the accumulator 19 through a pipeline.

[0055] Preferably, in this embodiment, a first reversing valve M1 is also provided between the first return oil port T and the accumulator 19. The first reversing valve M1 is used to control the connection or disconnection between the first return oil port T and the accumulator 19.

[0056] Preferably, in this embodiment, a pressure gauge ACC1 is also provided between the first reversing valve M1 and the accumulator 19. The pressure gauge ACC1 is used to detect the oil pressure flowing into the accumulator 19.

[0057] Preferably, in this embodiment, a second check valve 20 is also provided between the oil inlet P2 and the hydraulic oil pump 21; the second check valve 20 is used to control the connection or closure between the hydraulic oil pump 21 and the oil inlet P2.

[0058] Example 2: In addition to the above structure, see also Figures 3 to 5 As shown, the single-pump oil supply control main valve pumping system provided by the present invention can also be configured as follows: Includes the valve body and the swing cylinder main reversing valve 3, the main cylinder main reversing valve 5 and the oil source control valve group installed in the valve body; The valve body is provided with an oil inlet P2 connected to an external oil source, an oil inlet P2 connected to an external oil source, a first working oil port A1 connected to the rod chamber oil port of the main cylinder group, a second working oil port B1 connected to the rodless chamber oil port of the main cylinder group, a third working oil port A2 and a fourth working oil port A3 connected to the rod chamber oil port of the swing cylinder group, a fifth working oil port B2 and a sixth working oil port B3 connected to the rodless chamber oil port of the swing cylinder group, and a third return oil port T3 connected to the three-way proportional flow valve 10. The valve body is equipped with a swing cylinder main directional valve 3 and a main cylinder main directional valve 5; the swing cylinder main directional valve 3 and the main cylinder main directional valve 5 are arranged in parallel; the oil in the inlet P2 enters the swing cylinder main directional valve 3 through the oil passage, and the swing cylinder pilot solenoid valve 4 set on the valve body controls the first valve core in the swing cylinder main directional valve 3 to reciprocate axially, thereby distributing the oil in the inlet P2 to the third working oil port A2, the fourth working oil port A3, the fifth working oil port B2 and the sixth working oil port B3; at the same time, the oil in the inlet P1 enters the main cylinder main directional valve 5 through the oil passage, and the main cylinder pilot solenoid valve 6 set on the valve body controls the second valve core in the main cylinder main directional valve 5 to reciprocate axially, thereby distributing the oil in the inlet P2 to the first working oil port A1 and the second working oil port B1; The oil source control valve group is simultaneously connected to both oil inlet P1 and oil inlet P2, and oil from an external oil source enters both oil inlet P1 and oil inlet P2 through the oil source control valve group.

[0059] Preferably, in this embodiment, the oil source control valve group is connected to an external oil source through a pipeline, and a fourth reversing valve 22 is provided between the oil source control valve group and the external oil source. The fourth reversing valve 22 is used to control the connection or disconnection between the oil source control valve group and the external oil source.

[0060] Preferably, in this embodiment, the oil source control valve group is connected to the oil inlet P2 through a pipeline, and a fifth directional valve 23 is provided between the oil source control valve group and the oil inlet P2. The fifth directional valve 23 is used to control the connection or disconnection between the oil source control valve group and the oil inlet P2.

[0061] Preferably, in this embodiment, the oil source control valve group is connected to the oil inlet P1 through a pipeline, and a sixth directional valve 24 is provided between the oil source control valve group and the oil inlet P1. The sixth directional valve 24 is used to control the connection or disconnection between the oil source control valve group and the oil inlet P1.

[0062] Preferably, in this embodiment, the oil source control valve group is further provided with a seventh directional valve 25, which connects the oil source control valve group and the external oil tank.

[0063] As a further embodiment, the oil source control valve group includes a priority flow valve 8, a first check valve 9, and a three-way proportional flow valve 10. Oil from an external oil source enters the inlet P2 sequentially through the fourth directional valve 22, the priority flow valve 8, the first check valve 9, and the fifth directional valve 23. At the same time, oil from the external oil source enters the oil inlet P1 sequentially through the fourth directional valve 22, the priority flow valve 8, the three-way proportional flow valve 10 and the sixth directional valve 24; Excess oil in the three-way proportional flow valve 10 is returned to the external oil tank via the seventh directional valve 25.

[0064] Preferably, the remaining structures and their connection methods in this embodiment are the same as in Embodiment 1, and will not be repeated in this embodiment.

[0065] Example 3: In addition to the above structure, see also Figure 6 As shown, the single-pump oil supply control main valve pumping system provided by the present invention can also be configured as follows: Includes the valve body and the swing cylinder main reversing valve 3, the main cylinder main reversing valve 5 and the oil source control valve group installed in the valve body; The valve body is provided with an oil inlet P2 connected to an external oil source, an oil inlet P2 connected to an external oil source, a first working oil port A1 connected to the rod chamber oil port of the main cylinder group, a second working oil port B1 connected to the rodless chamber oil port of the main cylinder group, a third working oil port A2 and a fourth working oil port A3 connected to the rod chamber oil port of the swing cylinder group, a fifth working oil port B2 and a sixth working oil port B3 connected to the rodless chamber oil port of the swing cylinder group, and a third return oil port T3 connected to the three-way proportional flow valve 10. The valve body is equipped with a swing cylinder main directional valve 3 and a main cylinder main directional valve 5; the swing cylinder main directional valve 3 and the main cylinder main directional valve 5 are arranged in parallel; the oil in the inlet P2 enters the swing cylinder main directional valve 3 through the oil passage, and the swing cylinder pilot solenoid valve 4 set on the valve body controls the first valve core in the swing cylinder main directional valve 3 to reciprocate axially, thereby distributing the oil in the inlet P2 to the third working oil port A2, the fourth working oil port A3, the fifth working oil port B2 and the sixth working oil port B3; at the same time, the oil in the inlet P1 enters the main cylinder main directional valve 5 through the oil passage, and the main cylinder pilot solenoid valve 6 set on the valve body controls the second valve core in the main cylinder main directional valve 5 to reciprocate axially, thereby distributing the oil in the inlet P2 to the first working oil port A1 and the second working oil port B1; The oil source control valve group is simultaneously connected to both oil inlet P1 and oil inlet P2, and oil from an external oil source enters both oil inlet P1 and oil inlet P2 through the oil source control valve group.

[0066] Preferably, in this embodiment, the oil source control valve group is connected to an external oil source through a pipeline, and a fourth reversing valve 22 is provided between the oil source control valve group and the external oil source. The fourth reversing valve 22 is used to control the connection or disconnection between the oil source control valve group and the external oil source.

[0067] Preferably, in this embodiment, the oil source control valve group is connected to the oil inlet P2 through a pipeline, and a fifth directional valve 23 is provided between the oil source control valve group and the oil inlet P2. The fifth directional valve 23 is used to control the connection or disconnection between the oil source control valve group and the oil inlet P2.

[0068] Preferably, in this embodiment, the oil source control valve group is connected to the oil inlet P1 through a pipeline, and a sixth directional valve 24 is provided between the oil source control valve group and the oil inlet P1. The sixth directional valve 24 is used to control the connection or disconnection between the oil source control valve group and the oil inlet P1.

[0069] Preferably, in this embodiment, the oil source control valve group is further provided with a seventh directional valve 25, which connects the oil source control valve group and the external oil tank.

[0070] As a further embodiment, the oil source control valve group includes a priority flow valve 8, a first check valve 9, and a three-way proportional flow valve 10. Oil from an external oil source enters the inlet P2 sequentially through the fourth directional valve 22, the priority flow valve 8, the first check valve 9, and the fifth directional valve 23. At the same time, oil from the external oil source enters the oil inlet P1 sequentially through the fourth directional valve 22, the priority flow valve 8, the three-way proportional flow valve 10 and the sixth directional valve 24; Excess oil in the three-way proportional flow valve 10 is returned to the external oil tank via the seventh directional valve 25.

[0071] Preferably, the remaining structures and their connection methods in this embodiment are the same as in Embodiment 1, and will not be repeated in this embodiment.

[0072] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A single-pump oil supply control main valve pumping system, characterized in that, Includes a valve body and a swing cylinder main directional valve (3), a main cylinder main directional valve (5), a priority flow valve (8), a first check valve (9), and a three-way proportional flow valve (10) disposed in the valve body. The valve body is provided with an oil inlet (P2) connected to an external oil source, a first working oil port (A1) connected to the rod chamber oil port of the main cylinder group, a second working oil port (B1) connected to the rodless chamber oil port of the main cylinder group, a third working oil port (A2) and a fourth working oil port (A3) connected to the rod chamber oil port of the swing cylinder group, a fifth working oil port (B2) and a sixth working oil port (B3) connected to the rodless chamber oil port of the swing cylinder group, and a return oil circuit connected to the three-way proportional flow valve (10). The swing cylinder main directional valve (3) and the main cylinder main directional valve (5) are arranged in parallel; the oil in the inlet (P2) enters the swing cylinder main directional valve (3) through the oil passage, and the swing cylinder pilot solenoid valve (4) set on the valve body controls the first valve core in the swing cylinder main directional valve (3) to reciprocate axially, thereby distributing the oil in the inlet (P2) to the third working oil port (A2), the fourth working oil port (A3), the fifth working oil port (B2) and the sixth working oil port (B3); at the same time, the oil in the inlet (P2) enters the main cylinder main directional valve (5) through the oil passage, and the main cylinder pilot solenoid valve (6) set on the valve body controls the second valve core in the main cylinder main directional valve (5) to reciprocate axially, thereby distributing the oil in the inlet (P2) to the first working oil port (A1) and the second working oil port (B1). A priority flow valve (8), a first check valve (9), and a three-way proportional flow valve (10) are installed on the oil passage. The oil in the inlet (P2) enters the main directional valve (3) of the swing cylinder through the priority flow valve (8) and the first check valve (9), and the oil in the inlet (P2) enters the main directional valve (5) of the main cylinder through the priority flow valve (8) and the three-way proportional flow valve (10). Thus, the priority flow valve (8) ensures stable oil supply to the swing cylinder, and the first check valve (9) ensures that the swing cylinder action does not affect the main cylinder. The three-way proportional flow valve (10) is used to adjust the flow rate of the main cylinder oil supply, and excess oil flow is returned through the return oil passage set on the valve body.

2. The single-pump oil supply control main valve pumping system according to claim 1, characterized in that, A second check valve (20) is also provided between the oil inlet (P2) and the hydraulic oil pump (21); the second check valve (20) is used to control the connection or closure between the hydraulic oil pump (21) and the oil inlet (P2).

3. The single-pump oil supply control main valve pumping system according to claim 1 or 2, characterized in that, The main cylinder assembly includes a left push cylinder (13) and a right push cylinder (14); the swing cylinder assembly includes a left swing cylinder (11) and a right swing cylinder (12). The first working port (A1) is connected to the rod chamber port of the right push cylinder (14) through a pipe, and the second working port (B1) is connected to the rodless chamber port of the left push cylinder (13) through a pipe. The third working port (A2) is connected to the rod chamber port of the left swing cylinder (11) through a pipe, and the fifth working port (B2) is connected to the rodless chamber port of the right swing cylinder (12) through a pipe.

4. The single-pump oil supply control main valve pumping system according to claim 3, characterized in that, The oil output from the first working oil port (A1) and the second working oil port (B1) is high-pressure oil; The oil output from the third working oil port (A2), the fourth working oil port (A3), the fifth working oil port (B2), and the sixth working oil port (B3) is all atmospheric pressure oil.

5. The single-pump oil supply control main valve pumping system according to claim 4, characterized in that, The valve body is also provided with a first pressure measuring point (MA1) for measuring the oil pressure of the first working oil port (A1) and a second pressure measuring point (MA2) for measuring the oil pressure of the second working oil port (B1).

6. The single-pump oil supply control main valve pumping system according to claim 4 or 5, characterized in that, The return oil circuit includes a first return oil port (T1), a second return oil port (T2), and a third return oil port (T3) provided on the valve body. The first return port (T1) connects the main cylinder main reversing valve (5) and the external oil tank; The second return port (T2) connects the main directional valve (3) of the swing cylinder to the external oil tank; The third return port (T3) connects to the three-way proportional flow valve (10) and the external oil tank.

7. The single-pump oil supply control main valve pumping system according to claim 6, characterized in that, The main directional valve (3) of the swing cylinder is connected to the third working oil port (A2) and the fifth working oil port (B2) respectively. The main directional valve (3) of the swing cylinder is equipped with a first valve core that can reciprocate axially. The first valve core reciprocates axially under the control of the swing cylinder pilot solenoid valve (4), so that the oil inlet (P2) and the third working oil port (A2) are connected to supply oil. At the same time, the fifth working oil port (B2) is connected to the second return oil port (T2) set on the valve body to return oil, thereby realizing the intermittent oil supply of the two swing cylinders in the swing cylinder group, so that the two swing cylinders in the swing cylinder group work alternately.

8. The single-pump oil supply control main valve pumping system according to claim 7, characterized in that, The swing cylinder main reversing valve (3) has a first oil inlet P port, a first oil return T port, a first output A port and a first output B port; The first oil inlet P port and the first oil return T port are connected through the first oil passage in the valve body. The first oil return T port and the second oil return port (T2) are connected. The first output A port is connected to the third working oil port (A2) and the fourth working oil port (A3) through the second oil passage in the valve body. The first output B port is connected to the fifth working oil port (B2) and the sixth working oil port (B3) through the third oil passage in the valve body. Oil is introduced into the inlet port (P2) and the pilot solenoid valve (4) of the swing cylinder controls the first valve core to move, so that the inlet port (P2) is switched to the first output port A or the first output port B, thereby allowing the third working port (A2) and the fifth working port (B2) to supply oil alternately.

9. The single-pump oil supply control main valve pumping system according to claim 7, characterized in that, The main cylinder main reversing valve (5) is connected to the first working oil port (A1) and the second working oil port (A2) respectively. The main cylinder main reversing valve (5) is equipped with a second valve core that can reciprocate axially. The second valve core reciprocates axially under the control of the main cylinder pilot solenoid valve (6), so that the oil inlet (P2) and the first working oil port (A1) are connected to supply oil. At the same time, the second working oil port (B1) is connected to the first return oil port (T1) set on the valve body to return oil, thereby realizing the intermittent oil supply of the two main cylinders in the main cylinder group, so that the two main cylinders in the main cylinder group work alternately.

10. The single-pump oil supply control main valve pumping system according to claim 8 or 9, characterized in that, The main cylinder main directional valve (5) has a second oil inlet P port, a second oil return T port, a second output A port, and a second output B port; The second oil inlet P port and the second oil return T port are connected through the fourth oil passage in the valve body. The second oil return T port and the second oil return port (T2) are connected. The second output A port is connected to the first working oil port (A1) through the fifth oil passage in the valve body. The second output B port is connected to the second working oil port (B1) through the sixth oil passage in the valve body. Oil is introduced into the inlet port (P2) and the master cylinder pilot solenoid valve (6) controls the second valve core to operate, so that the inlet port (P2) and the second output port A or the second output port B are switched to conduct, thereby allowing the first working port (A1) and the second working port (B1) to alternately supply oil.

11. The single-pump oil supply control main valve pumping system according to claim 8 or 9, characterized in that, It also includes an overflow oil passage, which includes a swing cylinder overflow assembly (2) and a main cylinder overflow assembly (7) disposed in the valve body. The swing cylinder overflow assembly (2) is connected to the first return oil T port of the swing cylinder main reversing valve (3) and the accumulator (19) through a pipeline; The main cylinder overflow assembly (7) is connected to the second return oil T port of the main cylinder main reversing valve (5) and the external oil tank through a pipeline.

12. The single-pump oil supply control main valve pumping system according to claim 11, characterized in that, A third directional valve (M3) connected to the master cylinder overflow assembly (7) is also provided on the valve body; The third directional valve (M3) is used to control the connection or disconnection between the master cylinder overflow assembly (7) and the return oil circuit.

13. The single-pump oil supply control main valve pumping system according to claim 12, characterized in that, It also includes an oil drain circuit; The oil drain circuit includes the third control return port (Y3) and the fourth control return port (Y4) of the swing cylinder pilot solenoid valve (4), the first control return port (Y1) and the second control return port (Y2) of the master cylinder pilot solenoid valve (6), and the pilot pressure reducing valve (1) and the leakage port (L) provided in the valve body. The first control return port (Y1), the second control return port (Y2), the third control return port (Y3) and the fourth control return port (Y4) are all connected to the pilot pressure reducing valve (1). The pilot pressure reducing valve (1) is connected to the leak port (L) through a pipeline. The leak port (L) is connected to the external oil tank.

14. The single-pump oil supply control main valve pumping system according to claim 13, characterized in that, A second directional valve (M2) is also provided on the valve body for switching the pilot pressure reducing valve (1) and the master cylinder pilot solenoid valve (6). The second directional valve (M2) is used to control the connection or disconnection between the pilot pressure reducing valve (1) and the master cylinder pilot solenoid valve (6).

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