Integrated pumping main valve

Abstract

The present invention discloses an integrated pumping main valve, which includes a valve body, on which a main oil inlet, a main oil return port, a secondary oil inlet and a secondary oil return port are provided; the valve body is provided with a first oil outlet connected to the rod chamber oil port of the first oil cylinder and a second oil outlet connected to the rodless chamber oil port of the first oil cylinder, and the valve body is provided with a third oil outlet connected to the rod chamber oil port of the second oil cylinder and a fourth oil outlet connected to the rodless chamber oil port of the second oil cylinder; it also includes a high-pressure switching valve chamber and a low-pressure switching valve chamber integrated in the valve body and a cut-off valve assembly, one end of which is connected to the rod chamber oil port of the first oil cylinder and the other end is connected to the rod chamber oil port of the second oil cylinder, and the cut-off valve assembly is used to control the connection or disconnection of the oil circuit between the rod chamber of the first oil cylinder and the rod chamber of the second oil cylinder. The integrated pumping main valve has a small size, a simple structure, and is easy to install, and has a short oil supply oil circuit, low oil flow resistance, low pressure loss, and fast switching oil supply response.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic control systems for engineering machinery, in particular to an integrated pumping main valve. Background Art

[0002] In the field of engineering machinery and construction machinery, there are many equipment such as pump trucks, excavators, loaders, and double-ended excavators, which need to rely on cylinders to bear loads or perform actions, and the action of the cylinders is generally controlled by control valves; for example, when a pump truck is working, the pumping cylinder and the swing cylinder need to move alternately, and the alternating action between the pumping cylinders and the pumping cylinders and the alternating action between the pumping cylinders and the swing cylinders need to be controlled by the pumping main valve, that is, the pumping main valve controls the mortar pump to supply oil to the pumping cylinder or the swing cylinder, so as to realize the alternating action between the pumping cylinders and the pumping cylinders and the alternating action between the pumping cylinders and the swing cylinders. The structure of the pumping main valve in the prior art includes a base, on which is provided a main oil inlet connected to the mortar pump, an oil return port connected to the oil tank, and an oil outlet and an oil return port connected to two oil ports of at least one pumping cylinder, and an oil outlet and an oil return port connected to two oil ports of a swing cylinder; the top of the base is connected to a first solenoid switching valve and a second solenoid switching valve, the first solenoid switching valve controls the main oil inlet to supply oil to the oil outlet of the pumping cylinder or the main oil inlet to supply oil to the oil return port of the pumping cylinder, and the second solenoid switching valve controls the main oil inlet to supply oil to the oil outlet of the swing cylinder or the main oil inlet to supply oil to the oil return port of the swing cylinder. The pumping main valve of the existing technology has the following deficiencies in actual use: first, two or at least two solenoid switching valves are installed on the top of the base, which increases the volume of the entire pumping main valve, resulting in more installation restrictions, a more complex connection structure and inconvenient installation; second, the distance between the solenoid switching valve and the oil outlet, oil return port and main oil inlet on the base is relatively long, resulting in a longer oil path length connecting them, which makes the oil flow resistance larger and the oil pressure loss high when the pumping main valve supplies oil, the switching response is slow, and the oil outlet pressure is insufficient. Furthermore, in order to realize the alternating extension and retraction of the two parallel pumping cylinders, the two parallel pumping cylinders are generally connected and linked; a cylinder connecting valve or an on-off valve is used to directly connect the rod chamber oil ports of the two pumping cylinders, and a cylinder connecting valve or an on-off valve is used to connect the rodless chamber oil ports of the two pumping cylinders; but the connecting valve or on-off valve in the prior art is generally installed on a base, which undoubtedly increases the volume of the base, and the oil pressure has a large pressure loss when passing through the pipeline connection of the connecting valve, resulting in defects such as insufficient oil supply pressure. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the defects of the above-mentioned prior art and provide an integrated pumping main valve with small size, simple structure, easy installation, short oil supply circuit, low oil flow resistance, low pressure loss and fast switching oil supply response.

[0004] The technical solution of the present invention is to provide an integrated pumping main valve having the following structure:

[0005] A valve body, on which a main oil inlet connected to the oil pump and a main oil return port connected to the external oil tank are provided; the valve body is provided with a first oil outlet connected to the rod chamber oil port of the first oil cylinder and a second oil outlet connected to the rodless chamber oil port of the first oil cylinder, and the valve body is provided with a third oil outlet connected to the rod chamber oil port of the second oil cylinder and a fourth oil outlet connected to the rodless chamber oil port of the second oil cylinder;

[0006] A high-pressure switching valve chamber is arranged in the valve body, the high-pressure switching valve chamber has a first oil inlet connected to the main oil inlet, a first oil return connected to the main oil return, a first switching oil port connected to the second oil outlet, and a second switching oil port connected to the fourth oil outlet, a first switching valve stem that can reciprocate is fitted in the clearance in the high-pressure switching valve chamber, and the first switching valve stem can make the first oil inlet connected to the first switching oil port and the first oil return connected to the second switching oil port, or make the first oil inlet connected to the second switching oil port and the first switching oil port connected to the first oil return;

[0007] A low-pressure switching valve chamber is arranged in the valve body, the low-pressure switching valve chamber has a second oil inlet connected to the main oil inlet, a second oil return port connected to the main oil return port, a third switching oil port connected to the first oil outlet, and a fourth switching oil port connected to the third oil outlet, a second switching valve stem that can reciprocate is fitted in the clearance in the low-pressure switching valve chamber, and the second switching valve stem can make the second oil inlet connected to the third switching oil port and the second oil return port connected to the fourth switching oil port, or make the second oil inlet connected to the fourth switching oil port and the third switching oil port connected to the second oil return port;

[0008] A first solenoid valve group, connected to the valve body, for driving the first switching valve stem to reciprocate in the high-pressure switching valve chamber;

[0009] A second solenoid valve group is connected to the valve body and is used to drive the second switching valve stem to move back and forth in the low-pressure switching valve chamber;

[0010] The first on-off valve assembly is arranged in the valve body, one end of which is connected to the oil port of the rod chamber of the first oil cylinder, and the other end is connected to the oil port of the rod chamber of the second oil cylinder, and is used to control the connection or disconnection of the oil circuit between the rod chamber of the first oil cylinder and the rod chamber of the second oil cylinder.

[0011] As an improvement, the third switching oil port is connected to the first oil outlet via a first oil circuit channel, the fourth switching oil port is connected to the third oil outlet via a second oil circuit channel, the first on-off valve assembly is arranged between the first oil circuit channel and the second oil circuit channel, and one end of the first on-off valve assembly is connected to the first oil circuit channel, and the other end of the first on-off valve assembly is connected to the second oil circuit channel.

[0012] As an improvement, the oil circuit connecting the first switching oil port and the second oil outlet in the valve body is connected with a first locking mechanism, and the oil circuit connecting the second switching oil port and the fourth oil outlet is connected with a second locking mechanism. An electromagnetic control oil valve is connected to the valve body, and the control oil inlet of the electromagnetic control oil valve is connected with the main oil inlet, and the control oil outlet of the electromagnetic control oil valve is connected with the first locking mechanism and the second locking mechanism respectively, which are used to control the action of the first locking mechanism and the second locking mechanism to disconnect the oil circuit connecting the first switching oil port and the second oil outlet and the oil circuit connecting the second switching oil port and the fourth oil outlet.

[0013] As an improvement, the valve body is also provided with a secondary oil inlet and a secondary oil return port, as well as a fifth oil outlet connected to the first oil port of the swing cylinder and a sixth oil outlet connected to the second oil port of the swing cylinder; a swing cylinder switching valve chamber is provided in the valve body, and the swing cylinder switching valve chamber has a third oil inlet connected to the secondary oil inlet, a third oil return port connected to the secondary oil return port, a fifth switching oil port connected to the fifth oil outlet and a sixth switching oil port connected to the sixth oil outlet; a third switching valve stem that can move back and forth is matched with a clearance in the swing cylinder switching valve chamber, and the third switching valve stem can connect the third oil inlet with the fifth switching oil port and the third oil return port with the sixth switching oil port, or connect the third oil inlet with the sixth switching oil port and the fifth switching oil port with the third oil return port; a third solenoid valve group is connected to the valve body, and is used to drive the third switching valve stem to move back and forth in the swing cylinder switching valve chamber.

[0014] Preferably, the first on-off valve assembly includes an on-off valve chamber arranged in the valve body and located above the low-pressure switching valve chamber, one end of the on-off valve chamber is connected to the first oil circuit channel, and the other end of the on-off valve chamber is connected to the second oil circuit channel; the outer end of the on-off valve chamber is connected to the first cover plate, and the on-off valve chamber is provided with an annular step hole connecting the first oil circuit channel and the second oil circuit channel; an on-off valve core is slidably fitted in the on-off valve chamber, and a spring chamber is provided between the tail end of the on-off valve core and the first cover plate, and a compression spring is provided in the spring chamber, and the compression spring has a movement tendency to seal the head of the on-off valve core with the annular step hole; a first control oil channel connected to the spring chamber is provided on the first cover plate, and the first control oil channel is used to connect with the electromagnetic control valve, so that the control oil in the electromagnetic control valve enters or flows out of the spring chamber through the first control oil channel.

[0015] Preferably, a concave first annular groove is provided on the outer side wall of the on-off valve core, and the first annular groove is located in the on-off valve cavity close to the second oil passage, and the inner wall area of ​​the first annular groove away from the head of the on-off valve core is larger than the inner wall area of ​​the first annular groove close to the head of the on-off valve core.

[0016] Preferably, a third oil circuit channel is provided between the first switching oil port and the second oil outlet, and a fourth oil circuit channel is provided between the second switching oil port and the fourth oil outlet; the first locking mechanism comprises a first locking valve cavity arranged in the valve body, the first locking valve cavity is communicated with the third oil circuit channel, and the outer end of the first locking valve cavity is connected with the second cover plate; a first annular hole is provided in the third oil circuit channel, and a first locking valve core is slidably fitted in the first locking valve cavity, a first locking cavity is provided between the tail end of the first locking valve core and the second cover plate, a first elastic member is provided in the first locking cavity, and the first elastic member has a movement tendency to seal the head of the first locking valve core with the first annular hole; a second control oil channel connected to the first locking cavity is provided on the second cover plate, and the second control oil channel is connected to the control oil outlet of the electromagnetic control oil valve, so that the electromagnetic control The control oil in the oil control valve enters or flows out of the first locking chamber through the second control oil channel; the second locking mechanism includes a second locking valve chamber arranged in the valve body, the second locking valve chamber is communicated with the fourth oil channel, and the outer end of the second locking valve chamber is connected to the third cover plate; a second annular hole is provided in the fourth oil channel, and a second locking valve core is slidably fitted in the second locking valve chamber, a second locking chamber is provided between the tail end of the second locking valve core and the third cover plate, a second elastic member is provided in the second locking chamber, and the second elastic member has a movement tendency to seal the head of the second locking valve core with the second annular hole; a third control oil channel connected to the second locking chamber is provided on the third cover plate, and the third control oil channel is connected to the control oil outlet of the electromagnetic control oil valve, so that the control oil in the electromagnetic control oil valve enters or flows out of the second locking chamber through the third control oil channel.

[0017] Preferably, a second concave annular groove is provided on the outer side wall of the first locking valve core, the second annular groove is located in the third oil circuit channel close to the second oil outlet, and the inner side wall area of ​​the second annular groove away from the head of the first locking valve core is larger than the inner side wall area of ​​the second annular groove close to the head of the first locking valve core; a third concave annular groove is provided on the outer side wall of the second locking valve core, the third annular groove is located in the fourth oil circuit channel close to the fourth oil outlet, and the inner side wall area of ​​the third annular groove away from the head of the second locking valve core is larger than the inner side wall area of ​​the third annular groove close to the head of the second locking valve core.

[0018] Preferably, the high-pressure switching valve chamber and the low-pressure switching valve chamber are connected through multiple oil channels, and both the high-pressure switching valve chamber and the low-pressure switching valve chamber are located below the main oil inlet, and an oil supply channel with a larger outer end and a smaller inner end is provided between the main oil inlet and the first oil inlet.

[0019] Preferably, the valve body is connected with an electromagnetic unloading valve, the oil inlet end of the electromagnetic unloading valve is communicated with the main oil inlet port, and the oil outlet end of the electromagnetic unloading valve is communicated with the main oil return port.

[0020] After adopting the above structure, the integrated pumping main valve of the present invention has the following advantages compared with the prior art: the integrated pumping main valve integrates the high-pressure switching valve chamber, the low-pressure switching valve chamber and the swing cylinder switching valve chamber in the valve body, and the valve body is integrated with a main oil inlet connected to the oil pump and a main oil return connected to the external oil tank, a first oil outlet connected to the rod chamber oil port of the first oil cylinder, a second oil outlet connected to the rodless chamber oil port of the first oil cylinder, a third oil outlet connected to the rod chamber oil port of the second oil cylinder and a fourth oil outlet connected to the rodless chamber oil port of the second oil cylinder; and the rod chamber of the first oil cylinder and the rod chamber of the second oil cylinder are integrated in the valve body. The first on-off valve assembly for connecting or disconnecting the oil circuit between the rod chambers has a first locking mechanism and a second locking mechanism integrated in the valve body to connect the oil circuit between the first switching oil port and the second oil outlet and disconnect the oil circuit between the second switching oil port and the fourth oil outlet; thereby, the integrated pumping main valve has a high degree of integration, a small size, and is easy to transport and install; and because the oil circuit between the main oil inlet through the high-pressure switching valve chamber to the second oil outlet and the fourth oil outlet, as well as the oil circuit between the low-pressure switching valve chamber to the first oil outlet and the third oil outlet are both short, the oil flow resistance is low and the pressure loss is low, thereby meeting the oil inlet pressure requirements of the first cylinder, the second cylinder and the swing cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a front structural schematic diagram of the integrated pumping main valve of the present invention.

[0022] Figure 2 It is a schematic diagram of the back structure of the integrated pumping main valve of the present invention.

[0023] Figure 3 It is a schematic structural diagram from another angle of the integrated pumping main valve of the present invention.

[0024] Figure 4 It is a schematic diagram of the control principle of the integrated pumping main valve of the present invention.

[0025] Figure 5 It is a schematic diagram of the cross-sectional structure of the main oil inlet of the integrated pumping main valve of the present invention.

[0026] Figure 6 It is a schematic cross-sectional structure diagram of the high-pressure switching valve cavity and the low-pressure switching valve cavity of the integrated pumping main valve of the present invention.

[0027] Figure 7 It is a schematic cross-sectional structural diagram of a first on-off valve assembly of an integrated pumping main valve of the present invention.

[0028] Figure 8 It is a schematic cross-sectional structural diagram of the locking mechanism of the integrated pumping main valve of the present invention.

[0029] As shown in the figure:

[0030] 1. Valve body, 100. Main oil inlet, 101. Main oil return, 102. First oil outlet, 103. Second oil outlet, 104. Third oil outlet, 105. Fourth oil outlet, 106. Fifth oil outlet, 107. Sixth oil outlet, 108. Secondary oil inlet, 109. Secondary oil return, 110. Main oil inlet, 111. Oil channel, 2. High-pressure switching valve chamber, 200. First oil inlet, 201. First oil return, 202. First switching oil port, 203. Second switching oil port, 204. First Switching valve stem, 205, third oil channel, 206, fourth oil channel, 3, low pressure switching valve chamber, 300, second oil inlet, 301, second oil return port, 302, third switching oil port, 303, fourth switching oil port, 304, second switching valve stem, 305, first oil channel, 306, second oil channel, 4, first locking mechanism, 400, first locking valve chamber, 401, second cover plate, 402, second control oil channel, 403, first locking valve core, 404, first locking chamber, 4 05, first elastic member, 406, second annular groove, 407, first annular hole, 5, second locking mechanism, 500, second locking valve cavity, 501, third cover plate, 502, third control oil channel, 503, second locking valve core, 504, second locking cavity, 505, second elastic member, 506, third annular groove, 507, second annular hole, 6, electromagnetic control oil valve, 7, first on-off valve assembly, 700, on-off valve cavity, 701, first cover plate, 702, on-off valve core, 703, spring cavity , 704, compression spring, 705, first control oil channel, 706, first annular groove, 707, annular step hole, 8, first solenoid valve group, 800, second solenoid valve group, 9, solenoid unloading valve, 10, swing cylinder switching valve chamber, 1000, third oil inlet, 1001, third oil return port, 1002, fifth switching oil port, 1003, sixth switching oil port, 1004, third switching valve stem, 11, third solenoid valve group, 12, first oil cylinder, 13, second oil cylinder, 14, second on-off valve assembly. DETAILED DESCRIPTION

[0031] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] See also Figures 1 to 8 As shown;

[0033] The present invention discloses an integrated pumping main valve, which is connected to a machine such as a pump truck and is connected to an oil pump, and is used to input the oil of the oil pump into a first oil cylinder 12, a second oil cylinder 13 and a swing oil cylinder, so as to control the actions of the first oil cylinder 12, the second oil cylinder 13 and the swing oil cylinder. In this embodiment, the first oil cylinder 12 and the second oil cylinder 13 are both pumping oil cylinders; the structure of the integrated pumping main valve includes a valve body 1, which is provided with a main oil inlet 100 connected to the oil pump and a main oil return port 101 connected to an external oil tank; the valve body 1 is provided with a first oil outlet 102 connected to the rod chamber oil port of the first oil cylinder 12 and a second oil outlet 103 connected to the rodless chamber oil port of the first oil cylinder 12, and the valve body 1 is provided with a third oil outlet 104 connected to the rod chamber oil port of the second oil cylinder 13. And a fourth oil outlet 105 connected to the rodless chamber oil port of the second oil cylinder 13; the valve body 1 is also provided with a secondary oil inlet 108 and a secondary oil return port 109, as well as a fifth oil outlet 106 connected to the first oil port of the swing cylinder and a sixth oil outlet 107 connected to the second oil port of the swing cylinder; the second oil outlet 103, the fourth oil outlet 105 and the main oil inlet 100 are all located on the first end face of the valve body 1, the first oil outlet 102, the secondary oil return port 109 and the main oil return port 101 are all located on the second end face adjacent to the first end face of the valve body 1, the fifth oil outlet 106, the sixth oil outlet 107 and the secondary oil inlet 108 are all located on the third end face opposite to the first end face of the valve body 1; the third oil outlet 104 is located on the fourth end face opposite to the second end face of the valve body 1.

[0034] The present invention discloses an integrated pumping main valve, which further comprises a high-pressure switching valve chamber 2, which is arranged in a valve body 1, wherein the high-pressure switching valve chamber 2 has a first oil inlet 200 connected to a main oil inlet 100, a first oil return port 201 connected to a main oil return port 101, a first switching oil port 202 connected to a second oil outlet 103, and a second switching oil port 203 connected to a fourth oil outlet 105, wherein a first switching valve stem 204 that can reciprocate is fitted in the clearance in the high-pressure switching valve chamber 2, and the first switching valve stem 204 can make the first oil inlet 200 connected to the first switching oil port 202 and the first oil return port 201 connected to the second switching oil port 203. The first solenoid valve group 8 is connected to the valve body 1, and is used to drive the first switching valve rod 204 to move back and forth in the high-pressure switching valve chamber 2; both ends of the high-pressure switching valve chamber 2 are provided with an end cover, and a control oil chamber is provided between the two ends of the first switching valve rod 204 and the two end covers. The first solenoid valve group 8 controls the control oil to enter or flow out of the two control oil chambers, so as to realize the reciprocating movement of the first switching valve rod 204 in the high-pressure switching valve chamber 2, so that the high-pressure switching valve chamber supplies oil to the rodless chamber of the first oil cylinder or the second oil cylinder. The rodless chamber of the first oil cylinder or the second oil cylinder has a large cross-sectional area, and the high-pressure switching valve chamber is used to supply oil, so that the rodless chamber of the first oil cylinder or the second oil cylinder can be quickly filled with oil, so that the response time of the action of the first oil cylinder or the second oil cylinder is short and the working efficiency is high.

[0035] The low-pressure switching valve chamber 3 is arranged in the valve body 1 and arranged side by side with the high-pressure switching valve chamber 2. The low-pressure switching valve chamber 3 has a second oil inlet 300 connected to the main oil inlet 100, a second oil return port 301 connected to the main oil return port 101, a third switching oil port 302 connected to the first oil outlet 102 and a fourth switching oil port 303 connected to the third oil outlet 104. The clearance in the low-pressure switching valve chamber 3 is matched with a second switching valve rod 304 that can reciprocate. The second switching valve rod 304 can make the second oil inlet 300 communicate with the third switching oil port 302 and the second oil return port 301 communicate with the fourth switching oil port 303, or make The second oil inlet 300 is connected to the fourth switching oil port 303 and the third switching oil port 302 is connected to the second oil return port 301; the second solenoid valve group 800 is connected to the valve body 1 and is used to drive the second switching valve rod 304 to reciprocate in the low-pressure switching valve chamber 3; both ends of the low-pressure switching valve chamber 3 are provided with an end cover, and a control oil chamber is provided between the two ends of the second switching valve rod 304 and the two end covers. The second solenoid valve group 800 controls the control oil to enter or flow out of the two control oil chambers, so as to realize the reciprocating movement of the second switching valve rod 304 in the low-pressure switching valve chamber 3, so that the low-pressure switching valve chamber supplies oil to the rod chamber of the first oil cylinder or the second oil cylinder. Since the cross-sectional area of ​​the rod chamber of the first oil cylinder or the second oil cylinder is relatively small, the low-pressure switching valve chamber is used to supply oil with a lower pressure, so that the oil supply pressure of the first oil cylinder or the second oil cylinder is balanced.

[0036] The present invention provides an integrated pumping main valve, which also includes a first on-off valve assembly 7, which is arranged in the valve body 1, one end of which is connected to the rod chamber oil port of the first oil cylinder 12, and the other end is connected to the rod chamber oil port of the second oil cylinder 13, and is used to control the connection or disconnection of the oil circuit between the rod chamber of the first oil cylinder 12 and the rod chamber of the second oil cylinder 13. Of course, a second on-off valve assembly 14 is connected between the rodless chamber oil ports of the first oil cylinder and the second oil cylinder, and the second on-off valve assembly 14 is used to control the connection or disconnection between the rodless chamber oil ports of the first oil cylinder and the second oil cylinder. When the first on-off valve assembly 7 connects the oil circuit between the rod chambers of the first oil cylinder 12 and the second oil cylinder 13, and the second on-off valve assembly 14 connects the oil circuit between the rod chambers of the first oil cylinder 12 and the second oil cylinder 13, the first oil cylinder 12 and the second oil cylinder 13 can supply oil to each other when alternating, thereby relieving the oil supply pressure of the main oil inlet 100.

[0037] See again Figure 5 and Figure 7As shown, as an embodiment of the present invention, the third switching oil port 302 is connected to the first oil outlet 102 via the first oil circuit channel 305, the fourth switching oil port 303 is connected to the third oil outlet 104 via the second oil circuit channel 306, the first on-off valve assembly 7 is arranged between the first oil circuit channel 305 and the second oil circuit channel 306, and one end of the first on-off valve assembly 7 is connected to the first oil circuit channel 305, and the other end of the first on-off valve assembly 7 is connected to the second oil circuit channel 306. The first on-off valve assembly 7 includes an on-off valve chamber 700 arranged in the valve body 1 and located above the low-pressure switching valve chamber 3, one end of the on-off valve chamber 700 is connected to the first oil passage 305, and the other end of the on-off valve chamber 700 is connected to the second oil passage 306; the outer end of the on-off valve chamber 700 is connected to the first cover plate 701, and the on-off valve chamber 700 is provided with an annular step hole 707 connecting the first oil passage 305 and the second oil passage 306; an on-off valve core 702 is slidably matched in the on-off valve chamber 700, which A spring cavity 703 is provided between the tail end of the on-off valve core 702 and the first cover plate 701, and a compression spring 704 is provided in the spring cavity 703. The compression spring 704 has a movement tendency to seal the head of the on-off valve core 702 with the annular step hole 707; the first cover plate 701 is provided with a first control oil channel 705 connected to the spring cavity 703, and the first control oil channel 705 is used to connect with the electromagnetic control valve so that the control oil in the electromagnetic control valve enters or flows out of the spring cavity 703 through the first control oil channel 705. An inner concave first annular groove 706 is provided on the outer side wall of the on-off valve core 702, and the first annular groove 706 is located in the on-off valve cavity 700 near the second oil passage 306, and the inner side wall area of ​​the first annular groove 706 away from the head of the on-off valve core 702 is larger than the inner side wall area of ​​the first annular groove 706 near the head of the on-off valve core 702. When the first oil passage 305 and the second oil passage 306 are connected, the solenoid control valve controls the oil in the spring chamber 703 to flow out, and the oil pressure in the first oil passage 305 overcomes the elastic force of the compression spring 704 to make the head of the on-off valve core 702 separate from the annular step hole 707, so that the first oil passage 305 and the second oil passage 306 are connected; conversely, when the second oil passage 306 and the second oil passage 305 are connected, the oil pressure in the second oil passage 306 overcomes the elastic force of the compression spring 704 to make the on-off valve core 702 The inner wall of the first annular groove 706 is stressed so that the head of the on-off valve core 702 is separated from the annular step hole 707, so that the first oil channel 305 and the second oil channel 306 are connected; when the first oil channel 305 and the second oil channel 306 are disconnected, the electromagnetic control valve controls the control oil to enter the spring chamber 703, and the on-off valve core 702 moves downward under the oil pressure in the spring chamber 703 so that the head of the on-off valve core 702 is against the annular step hole 707, thereby disconnecting the first oil channel 305 and the second oil channel 306.

[0038] See again Figure 6 and Figure 8As shown, as an embodiment of the present invention, the oil circuit connecting the first switching oil port 202 and the second oil outlet 103 in the valve body 1 is connected with a first locking mechanism 4, and the oil circuit connecting the second switching oil port 203 and the fourth oil outlet 105 is connected with a second locking mechanism 5. The valve body 1 is connected with an electromagnetic control oil valve 6, and the control oil inlet of the electromagnetic control oil valve 6 is connected with the main oil inlet 100, and the control oil outlet of the electromagnetic control oil valve 6 is connected with the first locking mechanism 4 and the second locking mechanism 5 respectively, which is used to control the action of the first locking mechanism 4 and the second locking mechanism 5, so that the oil circuit connecting the first switching oil port 202 and the second oil outlet 103 and the oil circuit connecting the second switching oil port 203 and the fourth oil outlet 105 are disconnected. Specifically, a third oil passage 205 is provided between the first switching oil port 202 and the second oil outlet 103, and a fourth oil passage 206 is provided between the second switching oil port 203 and the fourth oil outlet 105; the first locking mechanism 4 comprises a first locking valve cavity 400 arranged in the valve body 1, the first locking valve cavity 400 is communicated with the third oil passage 205, and the outer end of the first locking valve cavity 400 is connected to the second cover plate 401; a first annular hole 407 is provided in the third oil passage 205, and the first locking valve cavity 400 is connected to the outer end of the second locking valve cavity 400. A first locking valve core 403 is slidably matched inside, and a first locking cavity 404 is provided between the tail end of the first locking valve core 403 and the second cover plate 401, and a first elastic member 405 is provided in the first locking cavity 404, and the first elastic member 405 has a movement tendency to seal the head of the first locking valve core 403 with the first annular hole 407; a second control oil channel 402 connected to the first locking cavity 404 is provided on the second cover plate 401, and the second control oil channel 402 is connected to the control oil outlet of the electromagnetic control oil valve 6, so that the electromagnetic The control oil in the control oil valve 6 enters or flows out of the first locking chamber 404 through the second control oil channel 402; the second locking mechanism 5 includes a second locking valve chamber 500 arranged in the valve body 1, the second locking valve chamber 500 is communicated with the fourth oil passage 206, and the outer end of the second locking valve chamber 500 is connected to the third cover plate 501; a second annular hole 507 is provided in the fourth oil passage 206, and a second locking valve core 503 is slidably matched in the second locking valve chamber 500, and the tail end of the second locking valve core 503 is connected to the third cover plate 501. 1, a second locking chamber 504 is provided between the second cover plate 501 and the second cover plate 502, a second elastic member 505 is provided in the second locking chamber 504, and the second elastic member 505 has a movement tendency to seal the head of the second locking valve core 503 with the second annular hole 507; the third cover plate 501 is provided with a third control oil channel 502 connected to the second locking chamber 504, and the third control oil channel 502 is connected to the control oil outlet of the electromagnetic control oil valve 6, so that the control oil in the electromagnetic control oil valve 6 enters or flows out of the second locking chamber 504 through the third control oil channel 502.A concave second annular groove 406 is provided on the outer wall of the first locking valve core 403, and the second annular groove 406 is located in the third oil circuit channel 205 near the second oil outlet 103, and the inner wall area of ​​the second annular groove 406 away from the head side of the first locking valve core 403 is larger than the inner wall area of ​​the second annular groove 406 close to the head side of the first locking valve core 403; a concave third annular groove 506 is provided on the outer wall of the second locking valve core 503, and the third annular groove 506 is located in the fourth oil circuit channel 206 near the fourth oil outlet 105, and the inner wall area of ​​the third annular groove 506 away from the head side of the second locking valve core 503 is larger than the inner wall area of ​​the third annular groove 506 close to the head side of the second locking valve core 503. The first locking mechanism 4 and the second locking mechanism 5 are set so that when the second oil outlet 103 or the fourth oil outlet 105 supplies oil, the first locking mechanism 4 and the second locking mechanism 5 are in an open state; during the process of the first oil cylinder and the second oil cylinder maintaining pressure or stabilizing pressure support, the oil in the rodless chamber of the first oil cylinder and the second oil cylinder can be prevented from flowing back to the high-pressure switching valve chamber, causing damage to the high-pressure switching valve chamber or slow switching response. The structural setting of the first locking mechanism 4 and the second locking mechanism 5 in the valve body has a reasonable structural layout, and effectively shortens the oil path length from the high-pressure switching valve chamber to the second oil outlet 103 or the fourth oil outlet 105, and the oil pressure loss is low.

[0039] See again Figures 4 to 6As shown, as an embodiment of the present invention, the valve body 1 is provided with a swivel cylinder switching valve chamber 10, and the swivel cylinder switching valve chamber 10 has a third oil inlet 1000 connected to the secondary oil inlet 108, a third oil return port 1001 connected to the secondary oil return port 109, a fifth switching oil port 1002 connected to the fifth oil outlet 106, and a sixth switching oil port 1003 connected to the sixth oil outlet 107. The clearance in the swivel cylinder switching valve chamber 10 is matched with a third switching valve chamber that can reciprocate. The valve stem 1004, the third switching valve stem 1004 can make the third oil inlet 1000 communicate with the fifth switching oil port 1002 and the third oil return port 1001 communicate with the sixth switching oil port 1003, or make the third oil inlet 1000 communicate with the sixth switching oil port 1003 and the fifth switching oil port 1002 communicate with the third oil return port 1001; the third solenoid valve group 11, connected to the valve body 1, is used to drive the third switching valve stem 1004 to reciprocate in the swing cylinder switching valve chamber 10. The swing cylinder switching valve chamber 10 has the same structure as the high-pressure switching valve chamber or the low-pressure switching valve chamber, and the oil supply switching method is also the same, which will not be described in detail in this embodiment; the third solenoid valve group 11 controls the control oil to enter the control oil chambers at both ends of the third switching valve stem 1004, thereby driving the third switching valve stem 1004 to reciprocate, so as to realize the intermittent oil supply of the fifth oil outlet 106 and the sixth oil outlet 107, and realize the reciprocating action of the swing oil cylinder. The valve body integrates a swing cylinder switching valve chamber 10, thereby shortening the length of the oil channel between the secondary oil inlet 108 to the fifth oil outlet 106 and the sixth oil outlet 107, reducing the oil flow resistance and the oil pressure loss, and making the valve body highly integrated and small in size.

[0040] See again Figure 5 and Figure 6 As shown, as an embodiment of the present invention, the high-pressure switching valve chamber 2 and the low-pressure switching valve chamber 3 are connected through multiple oil passages 111, and the high-pressure switching valve chamber 2 and the low-pressure switching valve chamber 3 are both located below the main oil inlet 100, and an oil supply passage 110 with a large outer end and a small inner end is provided between the main oil inlet 100 and the first oil inlet 200. In this way, the first oil inlet 200 and the second oil inlet 300 also share one oil inlet, that is, the first oil inlet 200 is used for oil supply; in addition, the position setting of the high-pressure switching valve chamber 2 and the low-pressure switching valve chamber 3 and the shape setting of the oil supply passage 110 enable the oil entering the main oil inlet 100 to quickly enter the high-pressure switching valve chamber 2 and the low-pressure switching valve chamber 3, further reducing the flow resistance of the oil in the oil supply passage and reducing the loss of oil pressure.

[0041] See again Figure 1 and Figure 4As shown in the figure, as an embodiment of the present invention, the valve body 1 is connected with an electromagnetic unloading valve 9, the oil inlet end of the electromagnetic unloading valve 9 is connected with the main oil inlet port 100, and the oil outlet end of the electromagnetic unloading valve 9 is connected with the main oil return port 101. The setting of the electromagnetic unloading valve facilitates the establishment of the pressure in the valve body of the integrated pumping main valve. Under the action of the electromagnetic unloading valve, the pressure in the valve body reaches the set maximum value, thereby ensuring the oil supply pressure.

[0042] In the description of the present invention, it should be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings or in actual use, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", "fourth", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features.

[0043] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. An integrated pumping main valve, characterized in that: It includes A valve body, on which a main oil inlet connected to the oil pump and a main oil return port connected to the external oil tank are provided; the valve body is provided with a first oil outlet connected to the rod chamber oil port of the first oil cylinder and a second oil outlet connected to the rodless chamber oil port of the first oil cylinder, and the valve body is provided with a third oil outlet connected to the rod chamber oil port of the second oil cylinder and a fourth oil outlet connected to the rodless chamber oil port of the second oil cylinder; the valve body is connected to an electromagnetic unloading valve, the oil inlet end of the electromagnetic unloading valve is connected to the main oil inlet, and the oil outlet end of the electromagnetic unloading valve is connected to the main oil return port; A high-pressure switching valve chamber is arranged in the valve body, the high-pressure switching valve chamber has a first oil inlet connected to the main oil inlet, a first oil return connected to the main oil return, a first switching oil port connected to the second oil outlet, and a second switching oil port connected to the fourth oil outlet, a first switching valve stem that can reciprocate is fitted in the clearance in the high-pressure switching valve chamber, and the first switching valve stem can make the first oil inlet connected to the first switching oil port and the first oil return connected to the second switching oil port, or make the first oil inlet connected to the second switching oil port and the first switching oil port connected to the first oil return; A low-pressure switching valve chamber is arranged in the valve body, the low-pressure switching valve chamber has a second oil inlet connected to the main oil inlet, a second oil return port connected to the main oil return port, a third switching oil port connected to the first oil outlet, and a fourth switching oil port connected to the third oil outlet, a second switching valve stem that can reciprocate is fitted in the clearance in the low-pressure switching valve chamber, and the second switching valve stem can make the second oil inlet connected to the third switching oil port and the second oil return port connected to the fourth switching oil port, or make the second oil inlet connected to the fourth switching oil port and the third switching oil port connected to the second oil return port; A first solenoid valve group, connected to the valve body, for driving the first switching valve stem to reciprocate in the high-pressure switching valve chamber; A second solenoid valve group is connected to the valve body and is used to drive the second switching valve stem to move back and forth in the low-pressure switching valve chamber; A first on-off valve assembly is arranged in the valve body, one end of which is connected to the oil port of the rod chamber of the first oil cylinder, and the other end is connected to the oil port of the rod chamber of the second oil cylinder, and is used to control the connection or disconnection of the oil circuit between the rod chamber of the first oil cylinder and the rod chamber of the second oil cylinder; the third switching oil port is connected to the first oil outlet via the first oil channel, and the fourth switching oil port is connected to the third oil outlet via the second oil channel, the first on-off valve assembly is arranged between the first oil channel and the second oil channel, and one end of the first on-off valve assembly is connected to the first oil channel, and the other end of the first on-off valve assembly is connected to the second oil channel; The first on-off valve assembly comprises an on-off valve chamber arranged in the valve body and located above the low-pressure switching valve chamber, one end of the on-off valve chamber is communicated with the first oil passage, and the other end of the on-off valve chamber is communicated with the second oil passage; the outer end of the on-off valve chamber is connected to the first cover plate, and the on-off valve chamber is provided with an annular step hole communicating with the first oil passage and the second oil passage; an on-off valve core is slidably fitted in the on-off valve chamber, a spring chamber is provided between the tail end of the on-off valve core and the first cover plate, a compression spring is provided in the spring chamber, and the compression spring has a movement tendency to seal the head of the on-off valve core with the annular step hole; a first control oil passage communicated with the spring chamber is provided on the first cover plate, and the first control oil passage is used to connect with the electromagnetic control valve, so that the control oil in the electromagnetic control valve enters or flows out of the spring chamber through the first control oil passage; A concave first annular groove is provided on the outer side wall of the on-off valve core, and the first annular groove is located in the on-off valve cavity close to the second oil passage, and the inner side wall area of ​​the first annular groove away from the on-off valve core head is larger than the inner side wall area of ​​the first annular groove close to the on-off valve core head.

2. The integrated pumping main valve according to claim 1, characterized in that: The oil circuit connecting the first switching oil port and the second oil outlet in the valve body is connected with a first locking mechanism, and the oil circuit connecting the second switching oil port and the fourth oil outlet is connected with a second locking mechanism. An electromagnetic control oil valve is connected to the valve body, and the control oil inlet of the electromagnetic control oil valve is connected with the main oil inlet, and the control oil outlet of the electromagnetic control oil valve is connected with the first locking mechanism and the second locking mechanism respectively, so as to control the action of the first locking mechanism and the second locking mechanism to disconnect the oil circuit connecting the first switching oil port and the second oil outlet and the oil circuit connecting the second switching oil port and the fourth oil outlet.

3. The integrated pumping main valve according to claim 1, characterized in that: The valve body is also provided with a secondary oil inlet and a secondary oil return port, as well as a fifth oil outlet connected to the first oil port of the swing cylinder and a sixth oil outlet connected to the second oil port of the swing cylinder; a swing cylinder switching valve chamber is provided in the valve body, and the swing cylinder switching valve chamber has a third oil inlet connected to the secondary oil inlet, a third oil return port connected to the secondary oil return port, a fifth switching oil port connected to the fifth oil outlet and a sixth switching oil port connected to the sixth oil outlet; a third switching valve rod that can move back and forth is matched with a clearance in the swing cylinder switching valve chamber, and the third switching valve rod can connect the third oil inlet with the fifth switching oil port and the third oil return port with the sixth switching oil port, or connect the third oil inlet with the sixth switching oil port and the fifth switching oil port with the third oil return port; a third solenoid valve group is connected to the valve body, and is used to drive the third switching valve rod to move back and forth in the swing cylinder switching valve chamber.

4. The integrated pumping main valve according to claim 2, characterized in that: A third oil circuit channel is provided between the first switching oil port and the second oil outlet, and a fourth oil circuit channel is provided between the second switching oil port and the fourth oil outlet; the first locking mechanism comprises a first locking valve cavity arranged in the valve body, the first locking valve cavity is communicated with the third oil circuit channel, and the outer end of the first locking valve cavity is connected with a second cover plate; a first annular hole is provided in the third oil circuit channel, and a first locking valve core is slidably fitted in the first locking valve cavity, a first locking cavity is provided between the tail end of the first locking valve core and the second cover plate, a first elastic member is provided in the first locking cavity, and the first elastic member has a movement tendency to seal the head of the first locking valve core with the first annular hole; a second control oil channel connected to the first locking cavity is provided on the second cover plate, and the second control oil channel is connected to the control oil outlet of the electromagnetic control oil valve, so that the electromagnetic control oil valve The control oil in the valve body enters or flows out of the first locking chamber through the second control oil channel; the second locking mechanism includes a second locking valve chamber arranged in the valve body, the second locking valve chamber is communicated with the fourth oil circuit channel, and the outer end of the second locking valve chamber is connected to the third cover plate; a second annular hole is provided in the fourth oil circuit channel, and a second locking valve core is slidably matched in the second locking valve chamber, a second locking chamber is provided between the tail end of the second locking valve core and the third cover plate, a second elastic member is provided in the second locking chamber, and the second elastic member has a movement tendency to seal the head of the second locking valve core with the second annular hole; a third control oil channel connected to the second locking chamber is provided on the third cover plate, and the third control oil channel is connected to the control oil outlet of the electromagnetic control oil valve, so that the control oil in the electromagnetic control oil valve enters or flows out of the second locking chamber through the third control oil channel.

5. The integrated pumping main valve according to claim 4, characterized in that: A second concave annular groove is provided on the outer side wall of the first locking valve core, and the second annular groove is located in the third oil circuit channel close to the second oil outlet, and the inner side wall area of ​​the second annular groove away from the head of the first locking valve core is larger than the inner side wall area of ​​the second annular groove close to the head of the first locking valve core; a third concave annular groove is provided on the outer side wall of the second locking valve core, and the third annular groove is located in the fourth oil circuit channel close to the fourth oil outlet, and the inner side wall area of ​​the third annular groove away from the head of the second locking valve core is larger than the inner side wall area of ​​the third annular groove close to the head of the second locking valve core.

6. The integrated pumping main valve according to claim 1, characterized in that: The high-pressure switching valve chamber and the low-pressure switching valve chamber are connected through multiple oil channels, and both the high-pressure switching valve chamber and the low-pressure switching valve chamber are located below the main oil inlet. An oil supply channel with a larger outer end and a smaller inner end is provided between the main oil inlet and the first oil inlet.

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