Hydraulic valve assembly, hydraulic valve oil inlet assembly and hydraulic valve

Abstract

The present invention relates to hydraulic equipment, and provides a hydraulic valve assembly, including a plug, a relief valve spring, a relief valve body, a three-way valve spring and a three-way valve core, one end of the relief valve body is arranged in the plug, a first cavity for installing the relief valve spring is formed between the relief valve body and the plug, one end of the relief valve spring abuts against the plug, the other end of the relief valve spring abuts against the relief valve body, and a second cavity for installing the three-way valve spring and the three-way valve core is formed inside the relief valve body. In addition, the present invention also provides a hydraulic valve oil inlet assembly and a hydraulic valve. The hydraulic valve assembly of the present invention integrates the relief valve and the three-way flow valve into one, which greatly saves valve body space, effectively reduces the number of valve holes, has a simple structure, and reduces costs.

Description

Technical Field

[0001] The present invention relates to hydraulic equipment, in particular to a hydraulic valve integrated component. In addition, the present invention also relates to a hydraulic valve oil inlet assembly and a hydraulic valve. Background Art

[0002] The multi-way valve is the core part of the hydraulic system of construction machinery. It is located between the pump and the actuator and is used to control the flow and direction of the hydraulic oil, thereby centrally controlling the movement direction and speed of the actuator of the construction machinery. According to the needs of the actuator, it mainly includes an oil inlet joint and several working joints. The working joint is the structure that controls the actuator, and the oil inlet joint is the structure that connects the pump and the working joint.

[0003] The current integrated multifunctional hydraulic valve oil inlet assembly places the three-way flow valve and the unloading valve separately, resulting in a waste of valve body space, and the sockets for installing the three-way flow valve and the unloading valve on the valve body need to be set separately. While increasing the sockets of the product, it is necessary to purchase socket tools, resulting in a waste of production hours, a complex structure, and increased costs.

[0004] Therefore, in view of the problems existing in the prior art, the present invention provides a hydraulic valve integrated component. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a hydraulic valve assembly which integrates a unloading valve and a three-way flow valve into one, thereby greatly saving valve body space, effectively reducing the number of valve holes, having a simple structure and reducing costs.

[0006] The present invention also provides a hydraulic valve oil inlet connection assembly, in which the unloading valve and the three-way flow valve are integrated into one, thus saving valve body space, having a simple structure, low processing difficulty and low cost.

[0007] The present invention also provides a hydraulic valve, which integrates a unloading valve and a three-way flow valve into one body without changing the original valve body casting, and has a small valve body space occupation, a simple structure, and reduced production costs.

[0008] In order to solve the above technical problems, the first aspect of the present invention provides a hydraulic valve assembly, including a plug, a unloading valve spring, a unloading valve body, a three-way valve spring and a three-way valve core, one end of the unloading valve body is arranged in the plug, and a first cavity for installing the unloading valve spring is formed between the unloading valve body and the plug, one end of the unloading valve spring abuts against the plug, and the other end of the unloading valve spring abuts against the unloading valve body, and a second cavity for installing the three-way valve spring and the three-way valve core is formed inside the unloading valve body.

[0009] Specifically, the end of the unloading valve body away from the plug is provided with a first through hole connected to the second cavity and a second through hole connected to the first through hole, one end of the three-way valve spring abuts against the unloading valve body, and the other end of the three-way valve spring abuts against the three-way valve core, so as to be able to control the opening and closing of the first through hole and the second through hole.

[0010] Specifically, the unloading valve body includes an unloading valve plug and an unloading valve core, the second cavity is located in the unloading valve core, one end of the unloading valve plug abuts against the unloading valve spring, and the other end thereof is located in the second cavity.

[0011] Specifically, the unloading valve plug is threadedly connected to the unloading valve core, and an O-ring is provided at the connection between the unloading valve plug and the unloading valve core.

[0012] Specifically, the unloading valve core is provided with a plurality of staggeredly arranged second through holes.

[0013] A second aspect of the present invention provides a hydraulic valve oil inlet assembly, including a valve body, a first socket and a second socket are provided on the valve body, a P oil port, an LS oil port and a T oil port are provided on the valve body, a P oil passage, an LS oil passage, a first control oil passage, a first oil return oil passage, a second control oil passage and a second oil return oil passage are provided inside the valve body, the P oil passage is connected to the P oil port, the LS oil passage is connected to the LS oil port, the first control oil passage is connected between the P oil passage and the first socket, the first oil return oil passage is connected between the first socket and the T oil port, the second control oil passage is connected between the LS oil passage and the second socket, the second oil return oil passage is connected between the second socket and the T oil port, the second control oil passage is connected to the second cavity, an integrated component is installed on the first socket, the integrated component is the hydraulic valve integrated component described in any one of the above technical solutions, and an LS overflow valve is installed on the second socket.

[0014] Specifically, a first annular groove is formed on the unloading valve body, the first annular groove is communicated with the second control oil passage, and a throttling hole communicated with the second cavity is formed on the first annular groove.

[0015] Specifically, a third plug hole is provided on the valve body, the third plug hole is communicated with the first control oil passage, the T oil port and the first cavity respectively, and a two-position three-way electromagnetic reversing valve is installed in the third plug hole.

[0016] Specifically, a fourth plug hole is provided on the valve body, and a pressure reducing valve is installed on the fourth plug hole. The valve body is also provided with an X oil passage arranged in the valve body and connected with the X oil port, a Y oil passage arranged in the valve body and connected with the Y oil port, a third control oil passage, a third oil return oil passage and a fourth oil passage. The third control oil passage is connected between the X oil passage and the fourth plug hole, the third oil return oil passage is connected between the Y oil passage and the fourth plug hole, and the fourth oil passage is connected between the P oil passage and the fourth plug hole.

[0017] A third aspect of the present invention provides a hydraulic valve, comprising the hydraulic valve oil inlet union assembly and the working union described in any one of the above technical solutions.

[0018] Through the above scheme, the beneficial effects of the present invention are as follows:

[0019] The hydraulic valve integrated component of the present invention integrates the three-way valve core and the three-way valve spring into the unloading valve body. The hydraulic oil pushes the three-way valve core to approach the three-way valve spring and opens the three-way valve core, thereby realizing the function of the three-way flow valve. The hydraulic oil pushes the unloading valve body to approach the unloading valve spring, thereby realizing the function of the unloading valve. By integrating the unloading valve and the three-way flow valve into one, the number of valve holes is effectively reduced, a large amount of internal space of the valve body is saved, the structure is simple, and the production cost is reduced.

[0020] In addition, in the hydraulic valve oil inlet assembly of the present invention, the opening or closing of the unloading valve is controlled by the two-position three-way electromagnetic reversing valve. When the working joint is not working and is on standby, the two-position three-way electromagnetic reversing valve loses power, the first cavity where the unloading valve spring is located is connected to the T oil port, and the unloading valve has the function of a one-way valve. It opens under the action of oil pressure, so that the oil in the P oil port is unloaded with a very small pressure, reducing the pressure loss and energy consumption during standby. When the working joint is working, the two-position three-way electromagnetic reversing valve is energized, the first cavity is connected to the P oil port, the unloading valve is closed, and the working joint can work normally. When the flow required by the working joint is less than the flow of the P oil port, the pressure difference between the P oil port and the LS oil port increases, the three-way valve core approaches the three-way valve spring, and the three-way valve core is opened, and the excess flow is discharged back to the oil tank through the three-way flow valve to prevent the pressure of the P oil port from continuing to rise, reducing energy loss.

[0021] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention but do not constitute a limitation of the present invention. In the accompanying drawings:

[0023] Figure 1 is a structural schematic diagram of a specific embodiment of the hydraulic valve assembly of the present invention;

[0024] Figure 2 It is a structural schematic diagram of a specific embodiment of the unloading valve core of the present invention;

[0025] Figure 3 The structure diagram of the specific embodiment of the hydraulic valve oil inlet assembly of the present invention is Figure 1 ;

[0026] Figure 4 The structure diagram of the specific embodiment of the hydraulic valve oil inlet assembly of the present invention is Figure 2 ;

[0027] Figure 5 It is a hydraulic principle diagram of a specific embodiment of the hydraulic valve oil inlet connection assembly of the present invention.

[0028] Description of Reference Numerals

[0029] 1 Plug 2 Unloading valve spring

[0030] 3 Sealing ring 4 O-ring

[0031] 5 Unloading valve plug 6 Unloading valve core

[0032] 61 first annular groove 62 throttle hole

[0033] 7 Three-way valve spring 8 Three-way valve core

[0034] 100 valve body 101 first plug hole

[0035] 102 second socket 103 third socket

[0036] 104 fourth socket 105P oil port

[0037] 106LS oil port 107T oil port

[0038] 108P oil passage 109LS oil passage

[0039] 110 first control oil passage 111 first oil return passage

[0040] 112 Second control oil passage 113 Second oil return passage

[0041] 114X oil passage 115Y oil passage

[0042] 116 Third control oil passage 117 Third oil return passage

[0043] 118 Fourth oil channel 200 pressure reducing valve

[0044] 201 pressure regulating relief valve 300 two-position three-way electromagnetic reversing valve

[0045] 400 integrated assembly 401 three-way flow valve

[0046] 500LS relief valve DETAILED DESCRIPTION

[0047] The specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention, and the protection scope of the present invention is not limited to the following specific embodiments.

[0048] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "formed", "installed", "set", "connected", etc. should be understood in a broad sense. For example, the connection can be a direct connection or an indirect connection through an intermediate medium, a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate connector, and it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] A first aspect of the present invention provides a hydraulic valve assembly, see Figure 1 , Figure 1 It is a specific embodiment of the hydraulic valve assembly of the present invention, mainly comprising a plug 1, a relief valve spring 2, a relief valve body, a three-way valve spring 7 and a three-way valve core 8. One end of the relief valve body is arranged in the plug 1, and a first cavity for installing the relief valve spring 2 is formed between the relief valve body and the plug 1. One end of the relief valve spring 2 abuts against the plug 1, and the other end of the relief valve spring 2 abuts against the relief valve body. A second cavity for installing the three-way valve spring 7 and the three-way valve core 8 is formed inside the relief valve body. When the hydraulic valve assembly of the present invention acts on the hydraulic system, the hydraulic oil acts on the three-way valve core 8 away from the three-way valve spring 7. The pressure at one end overcomes the compression force of the three-way valve spring 7, pushing the three-way valve core 8 to move closer to the three-way valve spring 7, thereby opening the three-way valve core 8 and realizing the function of the three-way flow valve; the pressure of the hydraulic oil acting on the unloading valve body away from the unloading valve spring 2 overcomes the compression force of the unloading valve spring 2, pushing the unloading valve body to move closer to the unloading valve spring 2, thereby opening the unloading valve body, unloading the hydraulic oil, and realizing the function of the unloading valve. The hydraulic valve assembly of the present invention can integrate the unloading valve and the three-way flow valve into one, greatly saving the valve body space, reducing the number of jacks, and reducing the production cost of the valve body. It should be noted that when realizing the function of the three-way flow valve, the unloading valve should be in a closed state, that is, the unloading valve body can be closed by pressurizing the first cavity.

[0050] See also Figure 1A first through hole connected to the second cavity and a second through hole connected to the first through hole are provided at the end of the unloading valve body away from the plug 1. One end of the three-way valve spring 7 abuts against the unloading valve body, and the other end of the three-way valve spring 7 abuts against the three-way valve core 8, so as to control the opening and closing of the first through hole and the second through hole. It should be noted that, as a specific implementation, the end of the three-way valve core 8 away from the three-way valve spring 7 can slide in the second through hole, and the sliding direction is consistent with the compression direction of the three-way valve spring 7, and the contact part of the three-way valve core 8 and the hole wall of the second through hole can fit tightly, thereby controlling the conduction and cutoff of the second through hole, and the second through hole is radially arranged on the outer peripheral wall of the unloading valve body corresponding to the first through hole. In the absence of hydraulic oil pressure, the compression force of the three-way valve spring 7 makes the three-way valve core 8 in the extreme position, and the part of the three-way valve core 8 located in the first through hole completely blocks the flow between the second through hole and the first through hole. When there is external hydraulic oil pressure, the pressure of the hydraulic oil can push the three-way valve core 8 to move so that the second through hole is connected to the first through hole, and according to the pressure of the hydraulic oil, the three-way valve core 8 controls the cross-sectional area of ​​the second through hole and the first through hole to control the flow.

[0051] In the specific embodiment of the hydraulic valve assembly of the present invention, see Figure 1 The unloading valve body includes an unloading valve plug 5 and an unloading valve core 6. The second cavity is located in the unloading valve core 6. One end of the unloading valve plug 5 abuts against the unloading valve spring 2, and the other end is located in the second cavity. The unloading valve body adopts a split structure, which is convenient for manufacturing, installation and maintenance. Specifically, the unloading valve plug 5 is threadedly connected to the unloading valve core 6, and an O-ring 4 is also provided at the connection between the unloading valve plug 5 and the unloading valve core 6 to strengthen the sealing performance of the connection between the unloading valve plug 5 and the unloading valve core 6 to prevent hydraulic oil leakage.

[0052] It should be noted that the plug 1 of the hydraulic valve assembly of the present invention is formed with a thread for installation on the hydraulic valve body at one end close to the three-way valve core 8, and a sealing ring 3 is provided on the plug 1 to ensure that the hydraulic valve assembly of the present invention has good sealing when installed on the hydraulic valve body.

[0053] See also Figure 2 A plurality of staggered second through holes are provided on the unloading valve core 6, and the plurality of second through holes are unevenly distributed on the outer surface of one end of the unloading valve core 6, and the aperture sizes of different second through holes may be different. The aperture sizes of the second through holes can be set according to design requirements to meet the flow adjustment size requirements of the three-way flow valve.

[0054] A second aspect of the present invention provides a hydraulic valve oil inlet assembly, see Figure 3-5As a specific embodiment of the hydraulic valve oil inlet assembly of the present invention, the valve body 100 includes a first plug hole 101 and a second plug hole 102, a P oil port 105, an LS oil port 106 and a T oil port 107 are provided on the valve body 100, and a P oil passage 108, an LS oil passage 109, a first control oil passage 110, a first return oil passage 111, a second control oil passage 112 and a second return oil passage 113 are provided inside the valve body 100, the P oil passage 108 is connected to the P oil port 105, the LS oil passage 109 is connected to the LS oil port 106, the first control oil passage 110 is connected to the LS oil port 106, and the first control oil passage 111 is connected to the LS oil port 106. 10 is connected between the P oil passage 108 and the first jack 101, the first return oil passage 111 is connected between the first jack 101 and the T oil port 107, the second control oil passage 112 is connected between the LS oil passage 109 and the second jack 102, the second return oil passage 113 is connected between the second jack 102 and the T oil port 107, the second control oil passage 112 is connected to the second cavity, an integrated component 400 is installed on the first jack 101, the integrated component 400 is the hydraulic valve integrated component provided by the first aspect of the present invention, and an LS overflow valve 500 is installed on the second jack 102. Among them, the integrated component 400 integrates the three-way flow valve 401 and the unloading valve 402 together. The three-way flow valve 401 and the unloading valve 402 both take in oil through the first control oil channel 110, and the three-way flow valve 401 and the unloading valve 402 both return oil through the first return oil channel 111, which greatly saves the internal space of the valve body 100 of the hydraulic valve oil inlet assembly and reduces the number of valve holes in the valve body 100. The structure is simple, the processing difficulty is reduced, and the production cost is saved.

[0055] It should be noted that when the hydraulic valve oil inlet assembly of the present invention is connected to the working joint for operation, the hydraulic oil in the P oil channel 108 will first be diverted by the three-way flow valve 401 at a fixed flow rate and returned to the T oil port 107. After diversion, the hydraulic oil will flow to the working joint at a fixed flow rate, thereby realizing flow control. In addition, the hydraulic oil pressure of the LS oil channel 109 depends on the load pressure of the working joint. The LS oil channel 109 is connected to the second cavity through the second control oil channel 112. When the hydraulic oil through the first control oil channel 110 pushes the three-way valve core 8 to move close to the three-way valve spring 7, it needs to overcome the compression force of the three-way valve spring 7 and the hydraulic oil pressure inside the second cavity. The second cavity is connected to the second control oil channel 112, and the second control oil channel 112 is connected to the LS oil channel 109. When the valve port of the working joint is closed, the LS oil channel 109 has no pressure, and the hydraulic oil in the P oil channel 108 can all be discharged from the second cavity. The three-way flow valve 401 returns oil to the T oil port; when the valve port of the working link is opened, the pressure of the LS oil channel 109 increases, and the pressure in the second chamber increases. At this time, the three-way valve core 8 moves away from the three-way valve spring 7, and the valve port of the three-way flow valve 401 is closed. The flow through the three-way flow valve 401 is reduced, and the reduced flow supplies the flow required by the valve port of the working link. When the flow required by the workload decreases, the pressure difference between the P oil port 105 and the LS oil port 106 increases, and the three-way valve core 8 approaches the three-way valve spring 7, and the excess flow is discharged back to the T oil port 107 through the three-way flow valve 401. The LS relief valve 500 is installed in the second jack to avoid excessive pressure inside the LS oil channel 109, thereby causing a safety accident. The LS relief valve 500 adopts a direct-acting relief valve, a pilot relief valve or an electric control relief valve.

[0056] Specifically, see Figure 1 and Figure 4 A first annular groove 61 is formed on the unloading valve body, and the first annular groove 61 is connected to the second control oil channel 112. A throttling hole 62 connected to the second cavity is formed on the first annular groove 61. The hydraulic oil in the second control oil channel 112 flows from the first annular groove 61 to the LS relief valve 500, and flows into the second cavity through the throttling hole 62 on the first annular groove 61, so that when the load pressure changes, the pressure of the second cavity is compensated. In addition, by arranging the first annular groove 61 on the unloading valve body, the occupation of the internal space of the valve body 100 is further reduced, and the processing difficulty of the valve body 100 is reduced.

[0057] See also Figure 3 and Figure 5The valve body 100 is also provided with a third plug hole 103, which is connected to the first control oil passage 110, the T oil port 107 and the first cavity respectively. A two-position three-way electromagnetic reversing valve 300 is installed in the third plug hole 103, and the two-position three-way electromagnetic reversing valve 300 is used to realize automatic unloading and loading of the spring cavity of the unloading valve 402. When the spring cavity of the unloading valve 402 of the integrated component 400 is unloaded, the hydraulic oil passing through the first control oil passage 110 pushes the unloading valve body to move close to the unloading valve spring 2. During the pushing process, it is necessary to overcome the compression force of the unloading valve spring 2 and the hydraulic oil pressure inside the first cavity. When the working link is in the working state, the two-position three-way electromagnetic reversing valve 300 is energized, the hydraulic system is loaded, and the hydraulic oil in the first control oil channel 110 flows to the first cavity through the two-position three-way electromagnetic reversing valve 300, so that the hydraulic oil pressure inside the first cavity is equal to the hydraulic oil pressure of the first control oil channel 110. Under the compression force of the unloading valve spring 2, the unloading valve core 6 is always in a closed state, and the hydraulic oil in the first control oil channel 110 cannot push the unloading valve core 6 to unload, and the working link can work normally. operation; when the working link is not working and is on standby, the two-position three-way solenoid reversing valve 300 loses power, the hydraulic system is unloaded, and the valve core of the two-position three-way solenoid reversing valve 300 moves, so that the first cavity is connected to the T oil port 107, and the unloading valve 402 has the function of a one-way valve. The hydraulic oil in the first cavity can return to the T oil port 107, and the hydraulic oil passing through the first control oil channel 110 only needs to overcome the compression force of the unloading valve spring 2 to push the unloading valve core 6 to move for unloading, thereby reducing the pressure loss and energy consumption during standby.

[0058] In the specific embodiment of the hydraulic valve oil inlet assembly of the present invention, see Figure 3 and Figure 5The valve body 100 is also provided with a fourth plug hole 104, and the fourth plug hole 104 is installed with a pressure reducing valve 200. The valve body 100 is also provided with an X oil passage 114 arranged in the valve body 100 and connected with the X oil port, a Y oil passage 115 arranged in the valve body 100 and connected with the Y oil port, a third control oil passage 116, a third oil return oil passage 117 and a fourth oil passage 118. The third control oil passage 116 is connected between the X oil passage 114 and the fourth plug hole 104, the third oil return oil passage 117 is connected between the Y oil passage 115 and the fourth plug hole 104, and the fourth oil passage 118 is connected between the P oil passage 108 and the fourth plug hole 104. The pressure reducing valve 200 reduces the pressure of the hydraulic oil in the fourth oil passage 118 to the required pilot pressure, and flows to the X oil passage 114. It should be noted that the pressure reducing valve 200 integrates the pressure stabilizing relief valve 201, which does not occupy the internal space of the valve body 100 while achieving more functions, reduces the number of valve holes, and further reduces the difficulty and cost of processing. Among them, the pressure stabilizing relief valve 201 plays a role of stabilizing pressure, so that the pressure of the pilot oil source entering the X oil channel 114 does not exceed the set value. When the pressure of the pilot oil source exceeds the set value, the valve port of the pressure stabilizing relief valve 201 opens, thereby returning oil through the Y oil channel 115 to reduce the pressure of the pilot oil source. An MP oil port is also opened on the valve body 100, and the MP oil port is connected to the P oil channel 108 to measure the pressure value of the P oil channel 108.

[0059] In order to better understand the working principle of the hydraulic valve oil inlet assembly of the present invention, the following is an explanation in combination with relatively preferred technical features:

[0060] See also Figure 1 , Figure 4 and Figure 5When the working link is working, the two-position three-way solenoid reversing valve 300 is energized in the right position, the hydraulic system is in a loaded state, the first control oil passage 110 is connected to the spring chamber (i.e., the first chamber) of the unloading valve 402, and the unloading valve 402 is in a state where it cannot unload. The hydraulic oil in the P oil passage 108 controls the flow of hydraulic oil flowing into the working link through the three-way flow valve 401, and the spring chamber (i.e., the second chamber) of the three-way flow valve 401 is connected to the LS oil passage 109 through the second control oil passage 112. The pressure of the LS oil passage 109 depends on the load pressure of the working link. When the valve port of the working link is opened, the pressure of the LS oil passage 109 changes accordingly, the load pressure of the working link increases, the pressure of the LS oil passage 109 increases, and the valve port of the three-way flow valve 401 becomes smaller, so that the flow of the three-way flow valve 401 is reduced, thereby supplying the reduced flow to the working link. When the flow rate required by the valve port increases and the flow rate required by the working link decreases, the pressure difference between the P oil port 105 and the LS oil port 106 increases, and the three-way valve core 8 approaches the three-way valve spring 7, returning the excess flow to the T oil port 107 through the three-way flow valve 401, so as to prevent the pressure of the P oil port 105 from continuing to rise and reduce energy loss. In addition, the flow supplied to the working link valve port is first reduced by the pressure reducing valve 200 to the control oil pressure required by the working link, and the LS relief valve 500 arranged between the T oil port 107 and the second control oil channel 112 can prevent the internal oil pressure of the LS oil channel 109 from being too high, causing safety hazards, and reduce the pressure of the hydraulic oil to the required pilot pressure through the pressure reducing valve 200. The pressure reducing valve 200 also integrates the function of the pressure stabilizing relief valve 201, so that when the pressure of the pilot oil source exceeds the set value, the oil can be returned to the Y oil channel 115 through the pressure stabilizing relief valve 201;

[0061] When the working link is not working and is on standby, the two-position three-way solenoid reversing valve 300 is de-energized and located in the left position, the hydraulic system is in a unloading state, the first control oil channel 110 is disconnected from the spring chamber of the unloading valve 402, and the spring chamber of the unloading valve 402 is connected to the T oil port 107, so that the hydraulic oil in the spring chamber of the unloading valve 402 can return to the T oil port 107. The unloading valve 402 has a one-way valve function. At this time, the pressure of the hydraulic oil in the first control oil channel 110 only needs to overcome the spring compression force of the unloading valve 402 to push the unloading valve core 6 to move, thereby opening the unloading valve 402 and returning oil to the T oil port through the first return oil channel 111, so as to unload the main oil circuit of the hydraulic system and avoid pressure loss and energy consumption during standby.

[0062] The hydraulic valve oil inlet assembly of the present invention integrates the three-way flow valve 401 and the unloading valve 402, reducing the internal space and the number of jacks of the valve body 100, making the structure of the valve body 100 simpler and more compact, easier to process and lower in cost.

[0063] The third aspect of the present invention further provides a hydraulic valve, comprising the hydraulic valve oil inlet union assembly and the working union of the present invention. The hydraulic valve has the same beneficial effects as the above-mentioned hydraulic valve oil inlet union assembly, which will not be repeated here.

[0064] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, a variety of simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0065] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0066] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A hydraulic valve assembly, characterized in that: The utility model comprises a plug (1), a relief valve spring (2), a relief valve body, a three-way valve spring (7) and a three-way valve core (8), wherein one end of the relief valve body is arranged in the plug (1), a first cavity for installing the relief valve spring (2) is formed between the relief valve body and the plug (1), one end of the relief valve spring (2) is in contact with the plug (1), the other end of the relief valve spring (2) is in contact with the relief valve body, and a second cavity for installing the three-way valve spring (7) and the three-way valve core (8) is formed inside the relief valve body; The end of the unloading valve body away from the plug (1) is provided with a first through hole connected to the second cavity and a second through hole connected to the first through hole; one end of the three-way valve spring (7) abuts against the unloading valve body, and the other end of the three-way valve spring (7) abuts against the three-way valve core (8) so as to control the opening and closing of the first through hole and the second through hole; The unloading valve body comprises an unloading valve plug (5) and an unloading valve core (6), the second cavity is located in the unloading valve core (6), one end of the unloading valve plug (5) is in contact with the unloading valve spring (2), and the other end thereof is located in the second cavity.

2. The hydraulic valve assembly according to claim 1, characterized in that: The unloading valve plug (5) is threadedly connected to the unloading valve core (6), and an O-ring (4) is provided at the connection between the unloading valve plug (5) and the unloading valve core (6).

3. The hydraulic valve assembly according to claim 1, characterized in that: The unloading valve core (6) is provided with a plurality of staggeredly arranged second through holes.

4. A hydraulic valve oil inlet assembly, characterized in that: The invention comprises a valve body (100), wherein the valve body (100) is provided with a first plug hole (101) and a second plug hole (102), wherein the valve body (100) is provided with a P oil port (105), an LS oil port (106) and a T oil port (107), wherein the valve body (100) is provided with a P oil passage, an LS oil passage, a first control oil passage, a first oil return oil passage, a second control oil passage and a second oil return oil passage, wherein the P oil passage is connected to the P oil port (105), the LS oil passage is connected to the LS oil port (106), the first control oil passage is connected between the P oil passage and the first plug hole (101), The first oil return passage is connected between the first socket (101) and the T oil port (107), the second control oil passage is connected between the LS oil passage and the second socket (102), the second oil return passage is connected between the second socket (102) and the T oil port (107), the second control oil passage is connected to the second cavity, an integrated component (400) is installed on the first socket (101), and the integrated component (400) is a hydraulic valve integrated component according to any one of claims 1 to 3, and an LS overflow valve (500) is installed on the second socket (102).

5. The hydraulic valve oil inlet assembly according to claim 4, characterized in that: A first annular groove (61) is formed on the unloading valve body, the first annular groove (61) is communicated with the second control oil passage, and a throttling hole (62) is formed on the first annular groove (61) and is communicated with the second cavity.

6. The hydraulic valve oil inlet assembly according to claim 4, characterized in that: The valve body (100) is provided with a third plug hole (103), the third plug hole (103) is respectively connected with the first control oil passage, the T oil port (107) and the first cavity, and the third plug hole (103) is installed with a two-position three-way electromagnetic reversing valve (300).

7. The hydraulic valve oil inlet assembly according to claim 4, characterized in that: The valve body (100) is provided with a fourth plug hole (104), and a pressure reducing valve (200) is installed in the fourth plug hole (104). The valve body (100) is also provided with an X oil passage arranged in the valve body (100) and communicating with the X oil port, a Y oil passage arranged in the valve body (100) and communicating with the Y oil port, a third control oil passage, a third oil return oil passage, and a fourth oil passage. The third control oil passage is communicated between the X oil passage and the fourth plug hole (104), the third oil return oil passage is communicated between the Y oil passage and the fourth plug hole (104), and the fourth oil passage is communicated between the P oil passage and the fourth plug hole (104).

8. A hydraulic valve, characterized in that: It comprises the hydraulic valve oil inlet union assembly and working union as described in any one of claims 4-7.

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