Dual-pump dual-motor switching control valve group and hydraulic control system

Abstract

The present invention discloses a switching control valve group and a hydraulic control system for a dual-pump dual-motor, which consists of three valve blocks stacked up and down. The three valve blocks realize upper and lower oil circuit communication through process ports running through the upper and lower parts, and realize oil circuit communication between multiple process ports in a single valve block through connecting oil ports, and the oil inlet and outlet ports of the dual pumps and dual motors are connected to the bottom fixed valve block. It is only necessary to rotate the middle switching valve block and / or the top switching valve block to realize oil circuit switching of various working conditions of the dual-pump dual-motor. There is no need to replace or disassemble the pipelines of the dual pump and dual motor, and the oil circuit switching can be realized only through the oil circuit design of the process ports and connecting oil ports on the valve blocks. There is no need to use hydraulic components, which greatly reduces the cost and failure rate, and has a simple and reliable structure.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic integrated control valve groups, and in particular, to a dual-pump dual-motor switching control valve group. In addition, it also particularly relates to a hydraulic control system using the switching control valve group. Background Art

[0002] With the development of construction machinery, higher demands are being placed on equipment miniaturization, lightweighting, and standardization. This has led to the widespread application of integrated hydraulic control valve group technology in construction machinery. In the drive systems of construction machinery, particularly travel transmission systems and cutting systems, pumps are often used to directly drive motors. Drive modes include dual pumps controlling dual motors, dual pumps controlling a single motor, and a single pump controlling dual motors. Currently, dual pumps controlling dual motors typically use integrated control valve groups, such as reversing valve groups, shuttle valve groups, and cartridge valve groups, to switch the oil circuits. For example, patent CN114198349A discloses a dual pump control single motor system. This system uses integrated control valve groups, such as reversing valve groups, shuttle valve groups, and cartridge valve groups, to switch the oil circuits. This system can achieve single-pump control of a single motor, dual-pump control of a single motor, and dual-pump control of a single motor. By expanding and combining the control valve groups, dual pump control of dual motors and single pump control of dual motors can also be achieved. However, this integrated control valve group requires numerous hydraulic components, resulting in complex control logic, high cost, and a high failure rate. Summary of the Invention

[0003] The present invention provides a switching control valve group and a hydraulic control system for dual pumps and dual motors to solve the technical problems of the existing method of using an integrated control valve group to realize dual pump control of dual motors, such as the large number of hydraulic components, complex control logic, high cost and high failure rate.

[0004] According to one aspect of the present invention, a switching control valve group for dual pumps and dual motors is provided, comprising a bottom fixed valve block, an intermediate switching valve block and a top switching valve block which are stacked up and down, the oil inlets and outlets of the dual pumps and dual motors being connected to the bottom fixed valve block, the bottom fixed valve block, the intermediate switching valve block and the top switching valve block being provided with a plurality of process ports which pass through the bottom and top to achieve communication of the upper and lower oil circuits, and each valve block being provided with a connecting oil port to achieve communication between different process ports on the same valve block, a sealing structure being provided at the upper and lower joints of the process ports of two adjacent valve blocks, and oil circuit switching of the dual pumps and dual motors in various working conditions being achieved by rotating the intermediate switching valve block and / or the top switching valve block.

[0005] Furthermore, the first pump oil inlet, the first pump oil outlet, the second pump oil inlet and the second pump oil outlet are symmetrically arranged on the front and rear sides of the bottom fixed valve block, the first motor oil inlet, the second motor oil inlet, the first motor oil outlet and the second motor oil outlet are symmetrically arranged on the left and right sides of the bottom fixed valve block, and a first connecting oil port is also provided on the side where the first motor oil inlet is located. The twelve process ports are evenly spaced in three rows and four columns on the bottom fixed valve block. The first pump oil inlet and the first motor oil inlet are both connected to the tenth process port, the first motor oil inlet is also connected to the ninth process port, the first pump oil outlet and the first motor oil outlet are connected to the eleventh process port, the first motor oil outlet is also connected to the twelfth process port, the second motor oil inlet is connected to the fifth process port, the second motor oil outlet is connected to the eighth process port, the second pump oil inlet is connected to the second process port and the sixth process port, the second pump oil outlet is connected to the third process port and the seventh process port, and the first connecting oil port is connected to the first process port, the fourth process port and the oil tank.

[0006] Furthermore, ten process ports are provided on the intermediate switching valve block, and are respectively connected one by one with the ten process ports at corresponding positions on the bottom fixed valve block. A second connecting oil port and a third connecting oil port are also provided on the rear side of the intermediate switching valve block. The second connecting oil port is connected with the eighteenth process port and the twenty-second process port, and the third connecting oil port is connected with the fifteenth process port and the nineteenth process port, and the outlets of the second connecting oil port and the third connecting oil port on the rear side are blocked.

[0007] Furthermore, four process ports are provided on the top switching valve block, and are respectively connected one by one with the four process ports at corresponding positions on the bottom fixed valve block and the middle switching valve block. A fourth connecting oil port and a fifth connecting oil port are also provided on the rear side of the top switching valve block. The fourth connecting oil port is connected with the twenty-fourth process port and the twenty-sixth process port, and the fifth connecting oil port is connected with the twenty-third process port and the twenty-fifth process port, and the outlets of the fourth connecting oil port and the fifth connecting oil port on the rear side are blocked.

[0008] Furthermore, in the normal working mode, the rear sides of the bottom fixed valve block, the middle switching valve block and the top switching valve block are aligned, and the switching control valve group is switched to the dual-pump dual-motor oil circuit.

[0009] Furthermore, on the basis of the normal working mode, the top switching valve block is rotated 180 degrees to switch to the emergency working mode, and the switching control valve group is switched to the single-pump dual-motor oil circuit.

[0010] Furthermore, on the basis of the normal working mode, the intermediate switching valve block is rotated 180 degrees to switch to the fast construction working mode, and the switching control valve group is switched to the dual-pump single-motor oil circuit.

[0011] Furthermore, on the basis of the normal working mode, the middle switching valve block and the top switching valve block are simultaneously rotated 180 degrees to switch to the energy-saving working mode, and the switching control valve group is switched to the single-pump single-motor oil circuit.

[0012] Furthermore, a sealing groove is provided around each process port on the top surface of the bottom fixed valve block and / or the bottom surface of the middle switching valve block, the top surface of the middle switching valve block and / or the bottom surface of the top switching valve block, and a sealing ring is provided in the sealing groove.

[0013] In addition, the present invention also provides a dual-pump dual-motor hydraulic control system, which adopts the switching control valve group as described above.

[0014] The present invention has the following effects:

[0015] The dual-pump dual-motor switching control valve group of the present invention is composed of three valve blocks stacked up and down. The three valve blocks realize upper and lower oil circuit communication through process ports running through the upper and lower parts, and realize oil circuit communication between multiple process ports in a single valve block through connecting oil ports, and the oil inlet and outlet ports of the dual pumps and dual motors are connected to the bottom fixed valve block. It is only necessary to rotate the middle switching valve block and / or the top switching valve block to realize oil circuit switching of various working conditions of the dual pumps and dual motors. There is no need to replace or disassemble the pipelines of the dual pumps and dual motors, and the oil circuit switching can be realized only through the oil circuit design of the process ports and connecting oil ports on the valve blocks. There is no need to use hydraulic components, which greatly reduces the cost and failure rate, and has a simple and reliable structure.

[0016] In addition, the dual-pump dual-motor hydraulic control system of the present invention also has the above advantages.

[0017] In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0019] Figure 1 It is an axial schematic diagram of a bottom fixed valve block according to a preferred embodiment of the present invention.

[0020] Figure 2 It is another axial schematic diagram of the bottom fixed valve block according to the preferred embodiment of the present invention.

[0021] Figure 3 1 is a perspective schematic diagram of a bottom fixed valve block according to a preferred embodiment of the present invention.

[0022] Figure 4It is an axial schematic diagram of the intermediate switching valve block according to a preferred embodiment of the present invention.

[0023] Figure 5 This is another axial schematic diagram of the intermediate switching valve block of the preferred embodiment of the present invention.

[0024] Figure 6 2 is a perspective schematic diagram of an intermediate switching valve block according to a preferred embodiment of the present invention.

[0025] Figure 7 It is an axial schematic diagram of the top switching valve block according to a preferred embodiment of the present invention.

[0026] Figure 8 This is another axial schematic diagram of the top switching valve block according to a preferred embodiment of the present invention.

[0027] Figure 9 2 is a perspective schematic diagram of a top switching valve block according to a preferred embodiment of the present invention.

[0028] Figure 10 It is an axial side schematic diagram of the switching control valve group of the dual pump and dual motor in the normal mode according to the preferred embodiment of the present invention.

[0029] Figure 11 It is a schematic diagram of another axial side of the dual-pump dual-motor switching control valve group in normal mode according to a preferred embodiment of the present invention.

[0030] Figure 12 It is a perspective schematic diagram of the switching control valve group of the dual pump and dual motor in the normal mode according to the preferred embodiment of the present invention.

[0031] Figure 13 It is a schematic diagram of the hydraulic principle of the dual-pump dual-motor switching control valve group in normal mode according to a preferred embodiment of the present invention.

[0032] Figure 14 It is an axial side schematic diagram of the dual-pump dual-motor switching control valve group in emergency mode according to a preferred embodiment of the present invention.

[0033] Figure 15 This is a schematic diagram of another axial side of the dual-pump dual-motor switching control valve group in emergency mode according to a preferred embodiment of the present invention.

[0034] Figure 16 It is a perspective schematic diagram of the switching control valve group of the dual pump and dual motor in the emergency mode according to the preferred embodiment of the present invention.

[0035] Figure 17 It is a schematic diagram of the hydraulic principle of the dual-pump dual-motor switching control valve group in emergency mode according to a preferred embodiment of the present invention.

[0036] Figure 18It is an axial schematic diagram of the switching control valve group of the dual pump and dual motor in the rapid construction mode according to the preferred embodiment of the present invention.

[0037] Figure 19 This is another axial schematic diagram of the dual-pump dual-motor switching control valve group in the rapid construction mode of the preferred embodiment of the present invention.

[0038] Figure 20 It is a perspective schematic diagram of the switching control valve group of the dual pump and dual motor in the fast construction mode according to the preferred embodiment of the present invention.

[0039] Figure 21 It is a schematic diagram of the hydraulic principle of the dual-pump dual-motor switching control valve group in the rapid construction mode of the preferred embodiment of the present invention.

[0040] Figure 22 It is an axial side schematic diagram of the dual-pump dual-motor switching control valve in energy-saving mode according to a preferred embodiment of the present invention.

[0041] Figure 23 It is a schematic diagram of another axial side of the switching control valve group of the dual pump and dual motor in the energy-saving mode according to the preferred embodiment of the present invention.

[0042] Figure 24 It is a perspective schematic diagram of the switching control valve group of the dual pump and dual motor in the energy-saving mode according to the preferred embodiment of the present invention.

[0043] Figure 25 It is a schematic diagram of the hydraulic principle of the switching control valve group of the dual pump and dual motor in the energy-saving mode of the preferred embodiment of the present invention.

[0044] Description of Reference Numerals

[0045] 100. Bottom fixed valve block; 200. Middle switching valve block; 300. Top switching valve block; 1. First process port; 2. Second process port; 3. Third process port; 4. Fourth process port; 5. Fifth process port; 6. Sixth process port; 7. Seventh process port; 8. Eighth process port; 9. Ninth process port; 10. Tenth process port; 11. Eleventh process port; 12. Twelfth process port; 13. Thirteenth process port; 14. Fourteenth process port; 15. Fifteenth process port; 16. Sixteenth process port; 17. Seventeenth process port; 18. Eighteenth process port; 19. Nineteenth process port; 20. Twentieth process port; 21. Twenty-first process port; 22. Twenty-second process port; 23. Twenty-third process port; 24. Twenty-fourth process port; 25. Twenty-fifth process port; 26. Twenty-sixth process port; 101. First pump; 102. Second pump; 103. First motor; 104. Second motor DETAILED DESCRIPTION

[0046] The embodiments of the present invention are described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0047] like Figures 1 to 9 As shown, a preferred embodiment of the present invention provides a switching control valve assembly for dual pumps and dual motors. The assembly comprises a bottom fixed valve block 100, an intermediate switching valve block 200, and a top switching valve block 300, stacked vertically. The intermediate switching valve block 200 is located between the bottom fixed valve block 100 and the top switching valve block 300. The oil inlets and outlets of the dual pumps and dual motors are connected to the bottom fixed valve block 100. Each of the bottom fixed valve block 100, the intermediate switching valve block 200, and the top switching valve block 300 is provided with multiple vertically extending process ports to connect the oil circuits. Each valve block is also provided with connecting oil ports to interconnect different process ports on the same valve block. Sealing structures are provided at the upper and lower joints between the process ports of adjacent valve blocks. Oil circuit switching for various operating conditions of the dual pumps and dual motors is achieved by rotating the intermediate switching valve block 200 and / or the top switching valve block 300.

[0048] It can be understood that the switching control valve group of the dual-pump dual-motor of this embodiment is composed of three valve blocks stacked up and down. The three valve blocks realize upper and lower oil circuit communication through process ports running through the upper and lower parts, and realize oil circuit communication between multiple process ports in a single valve block through connecting oil ports, and the inlet and outlet oil ports of the dual pumps and dual motors are connected to the bottom fixed valve block 100. It is only necessary to rotate the middle switching valve block 200 and / or the top switching valve block 300 to realize oil circuit switching of various working conditions of the dual pump dual motor. There is no need to replace or disassemble the pipelines of the dual pump dual motor, and the oil circuit switching can be realized only through the oil circuit design of the process ports and connecting oil ports on the valve blocks. There is no need to use hydraulic components, which greatly reduces the cost and failure rate, and has a simple and reliable structure.

[0049] Specifically, if Figures 1 to 3As shown, the first pump oil inlet A1, the first pump oil outlet B1, and the second pump oil inlet A2, the second pump oil outlet B2 are symmetrically arranged on the front and rear sides of the bottom fixed valve block 100. For example, the first pump oil inlet A1 and the first pump oil outlet B1 are located on the rear side of the bottom fixed valve block 100, while the second pump oil inlet A2 and the second pump oil outlet B2 are located on the front side of the bottom fixed valve block 100. The first motor oil inlet C1 and the second motor oil inlet C2, and the first motor oil outlet D1 and the second motor oil outlet D2 are symmetrically arranged on the left and right sides of the bottom fixed valve block 100. For example, the first motor oil inlet C1 and the second motor oil inlet C2 are located on the left side of the bottom fixed valve block 100, while the first motor oil outlet D1 and the second motor oil outlet D2 are located on the right side of the bottom fixed valve block 100. A first connecting oil port S1 is also provided on the side of the first motor oil inlet C1. Twelve process ports are evenly spaced in three rows and four columns on the bottom fixed valve block 100. The twelve process ports are numbered 1-12 from left to right and from top to bottom. The first pump oil inlet A1 and the first motor oil inlet C1 are both connected to the tenth process port 10. The first motor oil inlet C1 is also connected to the ninth process port 9. The first pump oil outlet B1 and the first motor oil outlet D1 are connected to the eleventh process port 11. The first motor oil outlet D1 is also connected to the twelfth process port 12. The second motor oil inlet C2 is connected to the fifth process port 5. The second motor oil outlet D2 is connected to the eighth process port 8. The second pump oil inlet A2 is connected to the second process port 2 and the sixth process port 6. The second pump oil outlet B2 is connected to the third process port 3 and the seventh process port 7. The first connecting oil port S1 is connected to the first process port 1, the fourth process port 4, and the oil tank.

[0050] It can be understood that the present invention directly connects the first pump oil inlet A1 to the first motor oil inlet C1 and directly connects the first pump oil outlet B1 to the first motor oil outlet D1, thereby always keeping the first pump connected to the first motor, reducing the number of oil circuits inside the valve group and making the valve group structure simpler.

[0051] In addition, if Figures 4 to 6As shown, the intermediate switching valve block 200 is provided with ten process ports, which are connected vertically and one by one with the ten process ports at corresponding positions on the bottom fixed valve block 100. The ten process ports on the intermediate switching valve block 200 are arranged in the same manner as the twelve process ports on the bottom fixed valve block 100, with only the first and last two process ports in the first row missing. These ports are numbered sequentially, i.e., 13-22. The second process port 2 is connected vertically and vertically with the fourteenth process port 14, the third process port 3 is connected vertically and vertically with the thirteenth process port 13, and so on. A second connecting oil port S2 and a third connecting oil port S3 are also provided on the rear side of the intermediate switching valve block 200. The second connecting oil port S2 is connected to the eighteenth process port 18 and the twenty-second process port 22, while the third connecting oil port S3 is connected to the fifteenth process port 15 and the nineteenth process port 19. The outlets of the second connecting oil port S2 and the third connecting oil port S3 on the rear side are blocked.

[0052] In addition, if Figures 7 to 9 As shown, the top switching valve block 300 has four process ports, which are connected vertically and one-to-one with the four process ports at corresponding positions on the bottom fixed valve block 100 and the middle switching valve block 200. Specifically, the four process ports are arranged in two rows and two columns and are numbered sequentially, 23-26. The twenty-third process port 23 is connected vertically and vertically with the sixteenth process port 16, the twenty-fourth process port 24 is connected vertically and vertically with the seventeenth process port 17, the twenty-fifth process port 25 is connected vertically and vertically with the twentieth process port 20, and the twenty-sixth process port 26 is connected vertically and vertically with the twenty-first process port 21. A fourth connecting oil port S4 and a fifth connecting oil port S5 are also provided on the rear side of the top switching valve block 300. The fourth connecting oil port S4 is connected to the twenty-fourth process port 24 and the twenty-sixth process port 26, while the fifth connecting oil port S5 is connected to the twenty-third process port 23 and the twenty-fifth process port 25. The outlets of the fourth connecting oil port S4 and the fifth connecting oil port S5 on the rear side are blocked.

[0053] It is understandable that Figures 10 to 13As shown, in the normal working mode, the rear sides of the bottom fixed valve block 100, the middle switching valve block 200 and the top switching valve block 300 are aligned, and the switching control valve group is switched to the dual-pump dual-motor oil circuit. Specifically, the second pump oil inlet A2 is connected to the second process port 2 and the sixth process port 6, the second process port 2 is connected to the fourteenth process port 14, the fourteenth process port 14 is blocked, the sixth process port 6 is connected to the seventeenth process port 17, the seventeenth process port 17 is connected to the twenty-fourth process port 24, the twenty-fourth process port 24 is connected to the fourth connecting oil port S4, the fourth connecting oil port S4 is blocked, the twenty-sixth process port 26 is connected to the twenty-fourth process port 24 through the fourth connecting oil port S4, the twenty-sixth process port 26 is connected to the twenty-first process port 21, and the second process port 27 is connected to the twenty-second process port 27. The eleventh process port 21 is communicated with the tenth process port 10, the tenth process port 10 is communicated with the first pump oil inlet A1 and the first motor oil inlet C1; the first motor oil inlet C1 is communicated with the ninth process port 9, the ninth process port 9 is communicated with the twenty-second process port 22, the twenty-second process port 22 is communicated with the second connecting oil port S2, and the second connecting oil port S2 is blocked; the eighteenth process port 18 is communicated with the twenty-second process port 22 through the second connecting oil port S2, the eighteenth process port 18 is communicated with the fifth process port 5, and the fifth process port 5 is communicated with the second motor oil inlet C2. To sum up: the second pump oil inlet A2 merges with the first pump oil inlet A1 through the sixth process port 6, the seventeenth process port 17, the twenty-fourth process port 24, the fourth connecting oil port S4, the twenty-sixth process port 26, the twenty-first process port 21, and the tenth process port 10 to act on the first motor oil inlet C1, and at the same time communicates with the second motor oil inlet C2 through the ninth process port 9, the twenty-second process port 22, the second connecting oil port S2, the eighteenth process port 18, and the fifth process port 5, thereby realizing the merger of the dual pump oil inlets A1 and A2 and the connection with the dual motor oil inlets C1 and C2.

[0054] The second pump oil return port B2 is communicated with the third process port 3 and the seventh process port 7, the third process port 3 is communicated with the thirteenth process port 13, the thirteenth process port 13 is blocked, the seventh process port 7 is communicated with the sixteenth process port 16, the sixteenth process port 16 is communicated with the twenty-third process port 23, the twenty-third process port 23 is communicated with the fifth connecting oil port S5, the fifth connecting oil port S5 is blocked, the twenty-fifth process port 25 is communicated with the twenty-third process port 23 through the fifth connecting oil port S5, the twenty-fifth process port 25 is communicated with the twentieth process port 20, and the twentieth process port 23 is connected to the fifth connecting oil port S5. Port 20 is communicated with the eleventh process port 11, the eleventh process port 11 is communicated with the first pump oil return port B1 and the first motor oil return port D1; the first motor oil return port D1 is communicated with the twelfth process port 12, the twelfth process port 12 is communicated with the nineteenth process port 19, the nineteenth process port 19 is communicated with the third connecting oil port S3, the third connecting oil port S3 is blocked, the fifteenth process port 15 is communicated with the nineteenth process port 19 through the third connecting oil port S3, the fifteenth process port 15 is communicated with the eighth process port 8, and the eighth process port 8 is communicated with the second motor oil outlet D2. To sum up: the second pump oil return port B2 merges with the first pump oil return port B1 through the seventh process port 7, the sixteenth process port 16, the twenty-third process port 23, the fifth connecting oil port S5, the twenty-fifth process port 25, the twentieth process port 20, and the eleventh process port 11 in sequence and acts on the first motor oil return port D1. At the same time, it is connected with the second motor oil return port D2 through the twelfth process port 12, the nineteenth process port 19, the third connecting oil port S3, the fifteenth process port 15, and the eighth process port 8, so that the dual pump oil return ports B1 and B2 merge and are connected to the dual motor oil return ports D1 and D2.

[0055] It will be appreciated that in normal operating mode, the oil inlet A1 of the first pump 101 and the oil inlet A2 of the second pump 102 merge, then connect to the oil inlet C1 of the first motor 103 and the oil inlet C2 of the second motor 104. Similarly, the oil return port B1 of the first pump 101 and the oil return port B2 of the second pump 102 merge, then connect to the oil return port D1 of the first motor 103 and the oil return port D2 of the second motor 104, thus achieving dual-pump merging and dual-motor control. Furthermore, motor reversal in normal mode simply involves swapping the oil inlets and outlets, so the specific oil circuit connection structure will not be detailed here.

[0056] It is understandable that Figures 14 to 17As shown, in normal operation mode, rotating the top switching valve block 300 180° switches to emergency operation mode, switching the control valve group to the single-pump, dual-motor oil circuit. For example, if the second pump 102 fails, the first pump 101 controls the operation of the first motor 103 and the second motor 104, implementing the single-pump, dual-motor emergency operation mode for construction. At this point, the second pump's oil inlet A2 communicates with the second process port 2 and the sixth process port 6. The second process port 2 communicates with the fourteenth process port 14, the fourteenth process port 14 communicates with the twenty-fifth process port 25, the sixth process port 6 communicates with the seventeenth process port 17, the seventeenth process port 17 communicates with the twenty-third process port 23, and the twenty-third process port 23 and the twenty-fifth process port 25 communicate with the fifth connecting port S5. The fifth connecting port S5 is blocked, meaning that the second pump's oil inlet A2 is blocked and not connected to the motor oil ports. Similarly, the second pump oil outlet B2 is communicated with the third process port 3 and the seventh process port 7, the third process port 3 is communicated with the thirteenth process port 13, the thirteenth process port 13 is communicated with the twenty-sixth process port 26, the seventh process port 7 is communicated with the sixteenth process port 16, the sixteenth process port 16 is communicated with the twenty-fourth process port 24, the twenty-fourth process port 24 and the twenty-sixth process port 26 are communicated with the fourth connecting oil port S4, and the fourth connecting oil port S4 is blocked, that is, the oil return port B2 of the second pump 102 is blocked and is not connected to the motor oil port.

[0057] The first pump oil inlet A1 is connected to the tenth process port 10 and the first motor oil inlet C1. The tenth process port 10 is connected to the twenty-first process port 21, which is blocked. The first motor oil inlet C1 is connected to the ninth process port 9, which is connected to the twenty-second process port 22. The twenty-second process port 22 is connected to the second connecting oil port S2, which is blocked. The eighteenth process port 18 is connected to the twenty-second process port 22 through the second connecting oil port S2. The eighteenth process port 18 is connected to the fifth process port 5, which is connected to the second motor oil inlet C2. Therefore, the first pump oil inlet A1 is connected to the first motor oil inlet C1 and, in turn, to the second motor oil inlet C2 through the ninth process port 9, the twenty-second process port 22, the second connecting oil port S2, the eighteenth process port 18, and the fifth process port 5. This allows the single pump oil inlet A1 to communicate with both motor oil inlets C1 and C2. Similarly, the first pump oil outlet B1 is communicated with the eleventh process port 11 and the first motor oil outlet D1; the eleventh process port 11 is communicated with the twentieth process port 20, the twentieth process port 20 is blocked, the first motor oil outlet D1 is communicated with the twelfth process port 12, the twelfth process port 12 is communicated with the nineteenth process port 19, the nineteenth process port 19 is communicated with the third connecting oil port S3, and the third connecting oil port S3 is blocked; the fifteenth process port 15 is communicated with the nineteenth process port 19 through the third connecting oil port S3, the fifteenth process port 15 is communicated with the eighth process port 8, and the eighth process port 8 is communicated with the second motor oil outlet D2. Therefore, the first pump oil return port B1 is the same as the first motor oil return port D1, and is connected to the second motor oil return port D2 through the twelfth process port 12, the nineteenth process port 19, the third connecting oil port S3, the fifteenth process port 15, and the eighth process port 8 in sequence, thereby realizing the connection between the single pump oil return port B1 and the dual motor oil return ports D1 and D2.

[0058] It will be appreciated that in emergency operation mode, the oil inlet A1 of the first pump 101 merges and communicates with the oil inlet C1 of the first motor 103 and the oil inlet C2 of the second motor 104. The oil return port B1 of the first pump 101 merges and communicates with the oil return ports D1 of the first motor 103 and D2 of the second motor 104. The oil inlet A2 of the second pump 102 is blocked from the oil return port B2, thereby achieving single-pump control of dual motors. Furthermore, motor reversal in emergency operation mode simply involves swapping the oil inlet and outlet ports, so the specific oil circuit connection structure will not be detailed here.

[0059] It is understandable that Figures 18 to 21As shown, on the basis of the normal working mode, the intermediate switching valve block 200 is rotated 180° to switch to the fast construction working mode, and the switching control valve group is switched to the dual-pump single-motor oil circuit. At this time, the dual pumps control the single motor to work, the motor speed is fast, and the construction speed is fast. Specifically, the second pump oil inlet A2 is communicated with the second process port 2 and the sixth process port 6, the second process port 2 is communicated with the twentieth process port 20, the twentieth process port 20 is blocked, the sixth process port 6 is communicated with the sixteenth process port 16, the sixteenth process port 16 is communicated with the twenty-fourth process port 24, the twenty-fourth process port 24 is communicated with the fourth connecting oil port S4, and the fourth connecting oil port S4 is blocked; the twenty-sixth process port 26 is communicated with the fourth connecting oil port S4 through the fourth connecting oil port S4, the twenty-sixth process port 26 is communicated with the thirteenth process port 13, the thirteenth process port 13 is communicated with the tenth process port 10, and the tenth process port 10 is communicated with the first pump oil inlet A1 and the first motor oil inlet C1; the first motor oil inlet C1 is communicated with the ninth process port 9, and the ninth process port 9 is blocked. Therefore, the second pump oil inlet A2 merges with the first pump oil inlet A1 through the sixth process port 6, the sixteenth process port 16, the twenty-fourth process port 24, the fourth connecting oil port S4, the twenty-sixth process port 26, the thirteenth process port 13, and the tenth process port 10 in sequence and communicates with the first motor inlet oil C1, thereby realizing the confluence of the dual pump oil inlets A1 and A2 and the communication with the single motor oil inlet C1. Similarly, the second pump oil outlet B2 is communicated with the third process port 3 and the seventh process port 7, the third process port 3 is communicated with the twenty-first process port 21, the twenty-first process port 21 is blocked, the seventh process port 7 is communicated with the seventeenth process port 17, the seventeenth process port 17 is communicated with the twenty-third process port 23, the twenty-third process port 23 is communicated with the fifth connecting oil port S5, the fifth connecting oil port S5 is blocked, the twenty-fifth process port 25 is communicated with the twenty-third process port 23 through the fifth connecting oil port S5, the twenty-fifth process port 25 is communicated with the fourteenth process port 14, the fourteenth process port 14 is communicated with the eleventh process port 11, the eleventh process port 11 is communicated with the first pump oil outlet B1 and the first motor oil outlet D1; the first motor oil outlet D1 is communicated with the twelfth process port 12, and the twelfth process port 12 is blocked. Therefore, the second pump oil return port B2 merges with the first pump oil return port B1 through the seventh process port 7, the seventeenth process port 17, the twenty-third process port 23, the fifth connecting oil port S5, the twenty-fifth process port 25, the fourteenth process port 14, and the eleventh process port 11 in sequence and communicates with the first motor oil return port D1, thereby realizing the merger of the dual pump oil return ports B1 and B2 and the communication with the single motor oil return port D1.Among them, the first connecting oil port S1 is communicated with the first process ports 1 and 4, and the first connecting oil port S1 is connected to the return oil from the oil tank; the first process port 1 is communicated with the nineteenth process port 19, the nineteenth process port 19 is communicated with the third connecting oil port S3, and the third connecting oil port S3 is blocked; the fifteenth process port 15 is communicated with the nineteenth process port 19 through the third connecting oil port S3, the fifteenth process port 15 is communicated with the fifth process port 5, the fifth process port 5 is communicated with the second motor oil inlet C2, the fourth process port 4 is communicated with the twenty-second process port 22, the twenty-second process port 22 is communicated with the second connecting oil port S2, and the second connecting oil port S2 is blocked; the eighteenth process port 18 is communicated with the twenty-second process port 22 through the second connecting oil port S2, the eighteenth process port 18 is communicated with the eighth process port 8, and the eighth process port 8 is communicated with the second motor oil outlet D2. That is, the oil inlet C2 of the second motor is connected to the oil return port D2 of the second motor through the fifth process port 5, the fifteenth process port 15, the third connecting oil port S3, the nineteenth process port 19, the first process port 1, the first connecting oil port S1, the fourth process port 4, the twenty-second process port 22, the second connecting oil port S2, the eighteenth process port 18, and the eighth process port 8 in sequence, and returns to the oil tank through the first connecting oil port S1. At this time, the oil inlet and return ports C2 and D2 of the second motor are connected to return to the oil tank. The second motor is in a free-wheel working state and can rotate freely under the drive of the load, so the system saves energy.

[0060] It can be understood that the oil inlet A1 of the first pump 101 and the oil inlet A2 of the second pump 102 merge and then communicate with the oil inlet C1 of the first motor 103. Similarly, the oil return port B1 of the first pump 101 and the oil return port B2 of the second pump 102 merge and then communicate with the oil return port D1 of the first motor 103, achieving dual-pump merging to control the operation of a single motor. The oil inlet C2 of the second motor 104 communicates with the oil return port D2 of the second motor 104 and is directly connected to the fuel tank. The second motor 104 is a freewheel, free to rotate under load, thus saving energy. Furthermore, the specific description of motor reversal is not repeated here.

[0061] It is understandable that Figures 22 to 25As shown, based on the normal operating mode, the middle switching valve block 200 and the top switching valve block 300 are simultaneously rotated 180° to switch to the energy-saving operating mode. The switching control valve group switches to a single-pump, single-motor oil circuit. For example, assuming that the first pump 101 and the first motor 103 are operating, and the second pump 102 and the second motor 104 are stopped, energy conservation is achieved. Specifically, the second pump's oil inlet A2 is connected to the second process port 2 and the sixth process port 6. The second process port 2 is connected to the twentieth process port 20. The twentieth process port 20 is connected to the twenty-fifth process port 25. The sixth process port 6 is connected to the sixteenth process port 16. The sixteenth process port 16 is connected to the twenty-third process port 23. The twenty-third process port 23 and the twenty-fifth process port 25 are connected to the fifth connecting oil port S5. The fifth connecting oil port S5 is blocked, that is, the oil inlet A2 of the second pump 102 is blocked and does not communicate with the motor oil port. Similarly, the second pump's oil outlet B2 communicates with the third process port 3 and the seventh process port 7. The third process port 3 communicates with the twenty-first process port 21, which communicates with the twenty-sixth process port 26. The seventh process port 7 communicates with the seventeenth process port 17, which communicates with the twenty-fourth process port 24. The twenty-fourth process port 24 and the twenty-sixth process port 26 communicate with the fourth connecting port S4. The fourth connecting port S4 is blocked, meaning that the oil return port B2 of the second pump 102 is blocked and not connected to the motor oil port. This means that the second pump's oil inlet and return ports A2 and B2 are blocked and not connected to the motor oil port. The first pump oil inlet A1 is connected to the tenth process port 10 and the first motor oil inlet C1. The tenth process port 10 is connected to the thirteenth process port 13, and the thirteenth process port 13 is blocked. The first motor oil inlet C1 is connected to the ninth process port 9, and the ninth process port 9 is blocked. That is, A1 and C1 are connected, thus achieving communication between the single pump oil inlet A1 and the single motor oil inlet C1. Similarly, the first pump oil outlet B1 is connected to the eleventh process port 11 and the first motor oil outlet D1. The eleventh process port 11 is connected to the fourteenth process port 14, and the fourteenth process port 14 is blocked. The first motor oil outlet D1 is connected to the twelfth process port 12, and the twelfth process port 12 is blocked. That is, B1 and D1 are connected, thus achieving communication between the single pump oil return port B1 and the single motor oil return port D1.Among them, the first connecting oil port S1 is communicated with the first process port 1 and the fourth process port 4, the first connecting oil port S1 is connected to the return oil from the oil tank, the first process port 1 is communicated with the nineteenth process port 19, the nineteenth process port 19 is communicated with the third connecting oil port S3, and the third connecting oil port S3 is blocked; the fifteenth process port 15 is communicated with the nineteenth process port 19 through the third connecting oil port S3, the fifteenth process port 15 is communicated with the fifth process port 5, the fifth process port 5 is communicated with the second motor oil inlet C2, the fourth process port 4 is communicated with the twenty-second process port 22, the twenty-second process port 22 is communicated with the second connecting oil port S2, the second connecting oil port S2 is blocked, the eighteenth process port 18 is communicated with the twenty-second process port 22 through the second connecting oil port S2, the eighteenth process port 18 is communicated with the eighth process port 8, and the eighth process port 8 is communicated with the second motor oil outlet D2. That is, the oil inlet C2 of the second motor is connected to the oil return port D2 of the second motor through the fifth process port 5, the fifteenth process port 15, the third connecting oil port S3, the nineteenth process port 19, the first process port 1, the first connecting oil port S1, the fourth process port 4, the twenty-second process port 22, the second connecting oil port S2, the eighteenth process port 18, and the eighth process port 8 in sequence, and returns to the oil tank through the first connecting oil port S1; at this time, the oil inlet and return ports C2 and D2 of the second motor are connected to the return oil tank, which is a free wheel and can rotate freely under the drive of the load, and the system is energy-saving and simple.

[0062] It can be understood that in energy-saving mode, the oil inlet A1 of the first pump 101 is connected to the oil inlet C1 of the first motor 103, and the oil return port B1 of the first pump 101 is connected to the oil return port D1 of the first motor 103. The oil inlet A2 of the second pump 102 is blocked from the oil return port B2; the oil inlet C2 of the second motor 104 is connected to the oil return port D2 and directly connected to the fuel tank. The second motor is a freewheel and can rotate freely under the drive of the load. This achieves the operation of a single pump controlling a single motor, and the other motor is a freewheel and can rotate freely under the drive of the load.

[0063] It is understood that the top surface of the bottom fixed valve block 100 and / or the bottom surface of the intermediate switching valve block 200, the top surface of the intermediate switching valve block 200, and / or the bottom surface of the top switching valve block 300 are provided with sealing grooves around each process port, and sealing rings are disposed within the sealing grooves. Preferably, the top surfaces of the bottom fixed valve block 100 and the intermediate switching valve block 200 are provided with sealing grooves.

[0064] In addition, another embodiment of the present invention also provides a dual-pump dual-motor hydraulic control system, preferably using the switching control valve group as described above, wherein the oil inlets and outlets of the dual pumps and dual motors are both connected to the bottom fixed valve block 100.

[0065] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A dual-pump dual-motor switching control valve group, characterized in that: The oil inlet and outlet of the dual pump and the dual motor are symmetrically arranged on the front and rear sides of the bottom fixed valve block, and the oil inlet and outlet of the first motor and the second motor are symmetrically arranged on the left and right sides of the bottom fixed valve block. A first connecting oil port is also provided on the side where the first motor oil inlet is located. Twelve process ports are connected on the bottom fixed valve block. The fixed valve block is evenly spaced in three rows and four columns, and the twelve process ports are numbered in sequence from left to right and from top to bottom. The first pump oil inlet and the first motor oil inlet are both connected to the tenth process port, the first motor oil inlet is also connected to the ninth process port, the first pump oil outlet and the first motor oil outlet are connected to the eleventh process port, the first motor oil outlet is also connected to the twelfth process port, the second motor oil inlet is connected to the fifth process port, the second motor oil outlet is connected to the eighth process port, the second pump oil inlet is connected to the second process port and the sixth process port, the second pump oil outlet is connected to the third process port and the seventh process port, the first connecting oil port is connected to the first process port, the fourth process port, and the oil tank. Ten process ports are opened on the intermediate switching valve block, and are respectively connected one by one with the ten process ports at the corresponding positions on the bottom fixed valve block. Compared with the twelve process ports on the bottom fixed valve block, the ten process ports on the intermediate switching valve block are arranged in the same manner, except that the first and last two process ports in the first row are missing.

2. The dual-pump dual-motor switching control valve assembly according to claim 1, characterized in that: A second connecting oil port and a third connecting oil port are also provided on the rear side of the intermediate switching valve block. The second connecting oil port is connected to the eighteenth process port and the twenty-second process port, and the third connecting oil port is connected to the fifteenth process port and the nineteenth process port. The outlets of the second connecting oil port and the third connecting oil port at the rear side are blocked.

3. The dual-pump dual-motor switching control valve assembly according to claim 2, characterized in that: Four process ports are provided on the top switching valve block, and are respectively connected one by one with the four process ports at corresponding positions on the bottom fixed valve block and the middle switching valve block. A fourth connecting oil port and a fifth connecting oil port are also provided on the rear side of the top switching valve block. The fourth connecting oil port is connected with the twenty-fourth process port and the twenty-sixth process port, and the fifth connecting oil port is connected with the twenty-third process port and the twenty-fifth process port. The outlets of the fourth connecting oil port and the fifth connecting oil port on the rear side are blocked.

4. The dual-pump dual-motor switching control valve assembly according to claim 3, characterized in that: In normal working mode, the rear sides of the bottom fixed valve block, the middle switching valve block and the top switching valve block are aligned, and the switching control valve group is switched to the dual-pump dual-motor oil circuit.

5. The dual-pump dual-motor switching control valve assembly according to claim 4, characterized in that: On the basis of the normal working mode, the top switching valve block is rotated 180 degrees to switch to the emergency working mode, and the switching control valve group is switched to the single-pump dual-motor oil circuit.

6. The dual-pump dual-motor switching control valve assembly according to claim 4, characterized in that: On the basis of the normal working mode, the middle switching valve block is rotated 180 degrees to switch to the fast construction working mode, and the switching control valve group is switched to the dual-pump single-motor oil circuit.

7. The dual-pump dual-motor switching control valve assembly according to claim 4, characterized in that: On the basis of the normal working mode, the middle switching valve block and the top switching valve block are rotated 180 degrees at the same time to switch to the energy-saving working mode, and the switching control valve group is switched to the single pump single motor oil circuit.

8. The dual-pump dual-motor switching control valve assembly according to claim 1, characterized in that: The top surface of the bottom fixed valve block and / or the bottom surface of the middle switching valve block, the top surface of the middle switching valve block and / or the bottom surface of the top switching valve block are provided with sealing grooves around each process port, and sealing rings are provided in the sealing grooves.

9. A dual-pump dual-motor hydraulic control system, characterized in that: A switching control valve group as described in any one of claims 1 to 8 is used.

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