Hydraulic control valve and hydraulic control system

Abstract

The present invention provides a hydraulic control valve and a hydraulic control system, wherein the hydraulic control valve comprises: a valve body, a flow channel is provided on the valve body, a receiving chamber is provided in the valve body, the first end of the flow channel is suitable for communicating with the boom control oil circuit, the second end of the flow channel is suitable for communicating with the inside of the boom pilot end cover, the flow channel is connected with the receiving chamber and forms a first port and a second port on the side wall of the receiving chamber; a valve core is movably arranged in the receiving chamber, a blocking structure is provided on the valve core, the valve core has an avoidance position and a blocking position, when the valve core is in the avoidance position, the blocking structure avoids the first port and the second port and connects the first port and the second port, when the valve core is in the blocking position, the blocking structure overlaps at least part of the first port and / or the second port. The technical solution of the present invention solves the defect of the complex hydraulic control method in the leveling work of the excavator in the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic equipment, and in particular to a hydraulic control valve and a hydraulic control system. Background Art

[0002] The working conditions of excavators are complex and the working environment is harsh. The coordinated use of multiple working devices often requires very precise individual control of each working device. When the excavator is doing leveling work, it needs to use the boom and the dipper stick in coordination. When working on the level ground, the boom is lifted and the dipper stick is excavated. The boom lifting should be slightly prior to the digging of the dipper stick, so that the bucket teeth of the bucket move linearly on the ground. Generally, the pilot handles that control the boom lifting and digging of the dipper stick on the excavator are operated in sequence. The pressure reducing valve in the hand valve corresponds to the pressure of the pilot end cover of the main valve that controls the oil inlet of the large chamber of the boom cylinder and the large chamber of the dipper stick cylinder, and controls the movement of the main valve core to open the oil inlet channel, so that the corresponding actions reach the priority order. Although this method is more effective for the excavator to implement leveling work, it requires a high level of operation for the excavator operator and there are many external distinguishing factors.

[0003] In view of the above problems, in the hydraulic control of some excavators in the prior art, the pressure entering the pilot end cover of the main valve acts on the priority valve on the main valve, and the oil inlet flow of the large chamber of the boom cylinder and the large chamber of the dipper cylinder is controlled by setting a throttling on the priority valve, so that the corresponding actions can reach the priority order. However, adding a priority valve to control the cylinder flow of the boom and dipper, on the one hand, requires the electronic control program to adjust the pilot pressure of the priority valve in real time to change the opening of the priority valve to control the output of the flow. Adding too much intervention of the electronic control program makes the control complicated; on the other hand, the priority valve increases the throttling, thereby increasing the pressure loss and increasing the fuel consumption. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the complex defects of the hydraulic control method in the leveling work of the excavator in the prior art, thereby providing a hydraulic control valve and a hydraulic control system.

[0005] In order to solve the above problems, the present invention provides a hydraulic control valve, comprising: a valve body, a flow channel is provided on the valve body, a accommodating chamber is provided in the valve body, a first end of the flow channel is suitable for communicating with a boom control oil circuit, a second end of the flow channel is suitable for communicating with the inside of a boom pilot end cover, the flow channel is communicated with the accommodating chamber and a first port and a second port are formed on the side wall of the accommodating chamber; a valve core is movably arranged in the accommodating chamber, a blocking structure is provided on the valve core, the valve core has an avoidance position and a blocking position, when the valve core is in the avoidance position, the blocking structure avoids the first port and the second port and connects the first port and the second port, when the valve core is in the blocking position, the blocking structure overlaps with at least part of the first port and / or the second port to reduce the flow area of ​​the flow channel, wherein the valve core has a first force-bearing portion and a second force-bearing portion arranged opposite to each other, the first force-bearing portion is suitable for communicating with the boom control oil circuit and being subjected to pressure toward the blocking position, and the second force-bearing portion is suitable for communicating with the flow channel and being subjected to pressure toward the avoidance position.

[0006] Optionally, a flow groove is provided on the side wall of the valve core, the first through port and the second through port are both communicated with the flow groove, and the blocking structure is provided in the flow groove.

[0007] Optionally, the blocking structure is an annular structure extending along the circumference of the valve core.

[0008] Optionally, a joint is provided at the first end of the valve body, and the joint is suitable for being connected to an external pipeline and communicating with a boom control oil circuit, and an end surface of the valve core facing the joint forms a first force-bearing portion.

[0009] Optionally, a recessed portion is provided on the end surface of the valve core facing away from the joint, and an inner wall of the recessed portion forms a second force-bearing portion.

[0010] Optionally, the valve core further comprises a flow hole, the flow hole connects the flow groove and the recessed portion, and the flow hole is located on a side of the blocking structure away from the joint.

[0011] Optionally, an elastic structure is provided between the second end of the valve body and the valve core, and the elastic structure applies an elastic force toward the joint to the valve core.

[0012] Optionally, a plug is provided at the second end of the valve body, a limiting step is provided on the side wall of the valve core, the elastic structure is a spring, and two ends of the spring are respectively in contact with the plug and the limiting step.

[0013] Optionally, the valve body and the boom pilot end cover are an integral structure.

[0014] The present invention also provides a hydraulic control system, comprising a hydraulic control valve, wherein the hydraulic control valve is the hydraulic control valve mentioned above.

[0015] The technical solution of the present invention has the following advantages:

[0016] By utilizing the technical solution of the present invention, when the excavator is working on the ground, the boom control oil circuit and the arm control oil circuit are supplied with oil at the same time, and the hydraulic oil in the boom control oil circuit first acts on the first force-bearing part of the valve core, and pushes the valve core to the blocking position. At this time, the hydraulic oil in the arm control oil circuit first flows through the flow channel on the valve body and then flows into the arm pilot end cover. Since the valve core is in the blocking position, the flow channel is throttled, so the hydraulic oil in the arm control oil circuit supplies oil to the arm pilot end cover at a speed lower than the normal speed after throttling, thereby making the boom supply oil faster than the arm supply oil, that is, making the boom move before the arm. After a period of time, the pressure in the arm control oil circuit gradually increases, and the hydraulic oil in the arm control oil circuit acts on the second force-bearing surface of the valve core, thereby making the valve core move from the blocking position to the avoidance position, and the arm achieves normal oil supply. The above structure uses the boom control oil circuit to control the movement of the valve core, and throttles the arm control oil circuit at the beginning of the leveling work, so as to achieve the logical control effect of the boom control oil circuit and the arm control oil circuit, and can achieve the technical effect of the boom action taking precedence over the arm action in the leveling work without the need for an additional electronic control program, thus simplifying the hydraulic control method. Therefore, the technical solution of the present invention solves the complex defects of the hydraulic control method of the excavator in the leveling work in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A schematic diagram showing the structure of an embodiment of a hydraulic control valve and a boom pilot end cover of the present invention is shown;

[0019] Figure 2 Shows Figure 1 A cross-sectional schematic diagram of a hydraulic control valve;

[0020] Figure 3 Shows Figure 1 A schematic cross-sectional view of a hydraulic control valve from a top view; and

[0021] Figure 4 Shows Figure 1 Schematic diagram of the control principle of the hydraulic control valve.

[0022] Description of reference numerals:

[0023] 10. Valve body; 11. Flow channel; 12. Accommodating chamber; 13. First outlet; 14. Second outlet; 20. Valve core; 21. Recessed portion; 22. Flow hole; 23. Limiting step; 24. First force-bearing portion; 25. Second force-bearing portion; 30. Sealing structure; 40. Flow groove; 50. Joint; 60. Elastic structure; 70. Plug; 100. Arm control oil circuit; 200. Boom control oil circuit; 300. Arm pilot end cover. DETAILED DESCRIPTION

[0024] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, 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", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0028] like Figures 1 to 3 As shown, the hydraulic control valve of this embodiment includes a valve body 10 and a valve core 20. The above two structures will be described in detail below.

[0029] like Figure 2 and Figure 3As shown, a flow channel 11 is provided on the valve body 10, and a receiving chamber 12 is provided inside the valve body 10. The first end of the flow channel 11 is suitable for communicating with the boom control oil circuit 100, and the second end of the flow channel 11 is suitable for communicating with the boom pilot end cover 300. The flow channel 11 is connected with the receiving chamber 12 and forms a first through-port 13 and a second through-port 14 on the side wall of the receiving chamber 12. Specifically, the valve body 10 is provided on the boom control oil circuit 100, and the hydraulic oil in the boom control oil circuit 100 must first pass through the flow channel 11 on the valve body 10 before entering the boom pilot end cover 300. The valve body 10 has a cavity inside and forms the above-mentioned receiving chamber 12. The flow channel 11 is connected with the receiving chamber 12, and then two through-ports, namely the first through-port 13 and the second through-port 14, are formed on the side wall of the receiving chamber 12. That is, before entering the boom pilot end cover 300, the boom control oil circuit 100 first enters the valve body 10 through the inlet of the circulation channel 11, then enters the accommodating chamber 12 through the first passage 13, and then leaves the valve body 10 through the second passage 14 and the outlet of the circulation channel 11 and enters the boom pilot end cover 300.

[0030] like Figure 2 and Figure 3 As shown, the valve core 20 is movably arranged in the accommodating cavity 12, and a blocking structure 30 is arranged on the valve core 20. The valve core 20 has an avoidance position and a blocking position. When the valve core 20 is in the avoidance position, the blocking structure 30 avoids the first port 13 and the second port 14 and connects the first port 13 and the second port 14. When the valve core 20 is in the blocking position, the blocking structure 30 overlaps with at least part of the first port 13 and / or the second port 14 to reduce the flow area of ​​the circulation channel 11. Specifically, the valve core 20 is slidably arranged in the accommodating cavity 12, so when the valve core 20 slides, the blocking structure 30 on the valve core 20 moves synchronously. The valve core 20 can move between the avoidance position and the blocking position. When the valve core 20 is in the avoidance position, the blocking structure 30 is misaligned with the first port 13 and the second port 14, and the area of ​​the first port 13 and the second port 14 is not blocked, so the flow of the circulation channel 11 is not affected. When the valve core 20 is in the avoidance position, the blocking structure 30 overlaps with at least part of the first port 13 and the second port 14 (or the blocking structure 30 overlaps with at least part of one of the first port 13 and the second port 14), thereby reducing the flow area of ​​the first port 13 and the second port, thereby throttling the flow channel 11.

[0031] Combination Figures 2 to 4It can be seen that the valve core 20 has a first force-bearing portion 24 and a second force-bearing portion 25 that are arranged relatively to each other. The first force-bearing portion 24 is suitable for being connected to the boom control oil circuit 200 and being subjected to pressure toward the blocking position, and the second force-bearing portion 25 is suitable for being connected to the flow channel 11 and being subjected to pressure toward the avoidance position. Specifically, the first force-bearing portion 24 and the second force-bearing portion 25 are arranged to drive the valve core 20. The first force-bearing portion 24 is connected to the boom control oil circuit 200, so after hydraulic oil is introduced into the boom control oil circuit 200, the pressure will be transmitted to the first force-bearing portion 24. Figure 2 It can be seen that the first force-bearing part 24 can drive the valve core 20 to move to the right after being stressed, thereby pushing the valve core 20 to the blocking position. The second force-bearing part 25 is connected to the circulation channel 11. As described above, the circulation channel 11 is connected to the boom control oil circuit 100, so the second force-bearing part 25 is actually connected to the boom control oil circuit 100. Figure 2 It can be seen that after the second force-bearing portion 25 is subjected to force, the valve core 20 can be driven to move to the left, thereby pushing the valve core 20 to the avoidance position.

[0032] Combined with the above structure, using the technical solution of this embodiment, when the excavator is leveling, the boom control oil circuit 200 and the arm control oil circuit 100 are supplied with oil at the same time, and the hydraulic oil in the boom control oil circuit 200 first acts on the first force-bearing part 24 of the valve core 20, and pushes the valve core 20 to the blocking position. At this time, the hydraulic oil in the arm control oil circuit 100 first flows through the flow channel 11 on the valve body 10 and then flows into the arm pilot end cover 300. Since the valve core 20 is in the blocking position, the flow channel 11 is throttled, so the hydraulic oil in the arm control oil circuit 100 is throttled and supplies oil to the arm pilot end cover 300 at a speed lower than the normal speed, thereby making the boom supply oil faster than the arm supply oil, that is, the boom moves before the arm. After a period of time, the pressure in the arm control oil circuit 100 gradually increases, and the pressure of the arm control oil circuit 100 acts on the second force-bearing surface of the valve core 20, thereby causing the valve core 20 to move from the blocking position to the avoidance position, and the arm can achieve normal oil supply. The above structure uses the boom control oil circuit 200 to control the movement of the valve core 20, and throttles the arm control oil circuit 100 at the beginning of the leveling work, so as to achieve the logical control effect of the boom control oil circuit and the arm control oil circuit, and can achieve the technical effect of the boom action taking precedence over the arm action during the leveling work without the need for additional electronic control programs, thereby simplifying the hydraulic control method. Therefore, the technical solution of this embodiment solves the complex defects of the hydraulic control method of the excavator during the leveling work in the prior art.

[0033] It should be noted that the hydraulic control valve in this embodiment does not affect the independent operation of the boom and the independent operation of the arm. Figures 2 to 4When the excavator is only performing boom lifting action, the boom control oil circuit 200 provides hydraulic oil. Part of the hydraulic oil directly enters the boom lifting pilot end cover of the main valve and controls the boom action, and the other part enters the valve body 10 and pushes the valve core 20 to move to the blocking position. However, since the boom is not working at this time, there is no hydraulic oil in the boom control oil circuit 100, so the action of the excavator is not affected. When the excavator is only performing boom excavation action, hydraulic oil is provided in the boom control oil circuit 100. At this time, since there is no hydraulic oil in the boom control oil circuit 200, the second force-bearing part 25 is under pressure and the valve core 20 is in the avoidance position. At this time, the flow channel 11 is not throttled, and the boom pilot end cover 300 can achieve normal oil inflow.

[0034] like Figure 2 and Figure 4 As shown, in the technical solution of this embodiment, a flow groove 40 is provided on the side wall of the valve core 20, the first port 13 and the second port 14 are both connected to the flow groove 40, and the blocking structure 30 is arranged in the flow groove 40. Specifically, the flow groove 40 is an annular groove arranged on the side wall of the valve core 20, and the flow groove 40 extends a certain distance along the axial direction of the valve core 20. Since the inner wall of the valve core 20 abuts against the outer wall of the valve body 10, in order to ensure that the hydraulic oil can flow from the first port 13 to the second port 14, the above-mentioned flow groove 40 is provided. Furthermore, no matter the valve core 20 is in the blocking position or the avoidance position, the first port 13 and the second port 14 are both connected to the flow groove, thereby ensuring that the hydraulic oil can flow into the boom pilot end cover 300. The blocking structure 30 is arranged on the flow groove 40. When the valve core 20 is in the avoidance position, the blocking structure 30 avoids the first and second ports 13 and 14, thereby making the first and second ports 13 and 14 all open to communicate with the flow groove. When the blocking structure 30 is in the blocking position, the blocking structure 30 partially blocks the first and second ports 13 and 14, so that only a part of the first and second ports 13 and 14 are connected to the flow groove 40, thereby achieving a throttling effect.

[0035] It should be noted that in the field of hydraulic control, the blocking structure 30 in this embodiment is also called a gear, and the flow groove 40 in this embodiment is also called a gear groove. Figure 2 It can be seen that the gear slot is divided into two parts, including a first gear slot located on the left side of the gear and a second gear slot located on the right side of the gear.

[0036] like Figures 1 to 3 As shown, in the technical solution of this embodiment, the blocking structure 30 is an annular structure extending along the circumference of the valve core 20. Specifically, the flow channel 11 in this embodiment is not a linear channel. The flow channel 11 is composed of two sections. Figure 3The first section is formed between the inlet of the circulation channel 11 and the first port 13, and the Figure 4 , a second section is formed between the second port 14 and the outlet of the circulation channel 11, the first section and the second section are arranged vertically, and the first section and the second section are connected through the above-mentioned flow groove 40. By setting the blocking structure 30 in a ring shape, the blocking structure 30 can block the first port 13 and the second port 14 at the same time. Of course, those skilled in the art can understand that when the valve core 20 is in the blocking position, only blocking the first port 13 or the second port 14 can also achieve the technical effect of throttling the circulation channel 11. Therefore, in some embodiments not shown, the blocking structure 30 can also be a blocking block arranged on the flow groove 40. When the valve core 20 is in the blocking position, the blocking block blocks the first port 13 or the second port 14.

[0037] like Figure 2 and Figure 3 As shown, in the technical solution of this embodiment, the first end of the valve body 10 is provided with a joint 50, which is suitable for connecting to an external pipeline and communicating with the boom control oil circuit 200, and the end surface of the valve core 20 facing the joint 50 forms a first force-bearing portion 24. Specifically, the first end of the valve body 10 is an open end, and the joint 50 is connected to the first end of the valve body 10 by interference fitting. The joint 50 is suitable for connecting to an external pipeline, so that the first end of the valve body 10 can be communicated with the boom control oil circuit 200. Figure 2 and Figure 3 It can be seen that the valve core 20 is cylindrical in shape, and the end of the valve core 20 facing the connector 50, i.e. Figure 2 and Figure 3 The left end of the middle valve core 20 forms the first force-bearing portion 24. When hydraulic oil is introduced into the boom control oil circuit 200, the hydraulic oil is introduced into the first force-bearing portion 24 of the valve core 20 through the joint 50, thereby connecting the pressure at the left end of the valve core 20 to the pressure in the boom control oil circuit 200.

[0038] like Figure 2 and Figure 3 As shown, in the technical solution of this embodiment, a recessed portion 21 is provided on the end face of the valve core 20 away from the joint 50, and the inner wall of the recessed portion 21 forms a second force-bearing portion 25. Specifically, in combination with the above description, the end face of the valve core 20 away from the joint 50, that is, the right end face, is provided with a recessed portion 21. Among them, the recessed portion 21 is a columnar recessed space, and the recessed space is connected to the above-mentioned flow channel 11. Therefore, when hydraulic oil is introduced into the boom control oil circuit 100, the space in the recessed portion 21 is connected to the pressure in the boom control oil circuit 100. From Figure 2 and Figure 3It can be seen that the inner wall of the recess 21 includes an annular inner side wall and a bottom wall. Those skilled in the art can understand that when the hydraulic oil acts on the inner wall of the recess 21, it is mainly the pressure on the bottom wall that pushes the valve core 20 to move leftward.

[0039] like Figure 2 and Figure 3 As shown, in the technical solution of this embodiment, the valve core 20 also includes a flow hole 22, the flow hole 22 connects the flow groove 40 and the recessed portion 21, and the flow hole 22 is located on the side of the blocking structure 30 away from the joint 50. Specifically, through the above structure, when hydraulic oil is introduced into the boom control oil circuit 100, a part of the hydraulic oil passes through the first port 13, the flow groove 40 and the second port 14 and then enters the boom pilot end cover 300, and the other part passes through the flow hole 22 on the flow groove 40 and enters the recessed portion 21, so that the hydraulic oil can exert pressure on the inner wall of the recessed portion 21. Figure 2 and Figure 3 It can be seen that the flow hole 22 is located on the side of the blocking structure 30 away from the joint 50, that is, on the right side of the blocking structure 30, so that no matter whether the valve core 20 is in the blocking position or the avoidance position, the space in the recess 21 can be connected with the first through port 13 and the second through port 14 through the flow hole 22.

[0040] It should be noted that the above-mentioned recessed portion 21 is formed by drilling a hole on the right end surface of the valve core 20 , and the flow groove 40 and the space in the hole are connected through the flow hole 22 .

[0041] like Figure 2 and Figure 3As shown, in the technical solution of this embodiment, an elastic structure 60 is provided between the second end of the valve body 10 and the valve core 20, and the elastic structure 60 applies an elastic force to the valve core 20 in the direction of the joint 50. Specifically, the function of the elastic structure 60 is to keep the valve core 20 in the avoidance position when the first force-bearing part 24 of the valve core 20 is not subjected to pressure. When the excavator is working on the ground, hydraulic oil is simultaneously introduced into the boom control oil circuit 200 and the arm control oil circuit 100, and the hydraulic oil in the boom control oil circuit 200 acts on the first force-bearing part 24 of the valve core 20, and overcomes the elastic force of the elastic structure 60 to push the valve core 20 to the blocking position. At this time, the hydraulic oil in the arm control oil circuit 100 is throttled by the blocking structure 30, and the flow rate is slowed down, and enters the recessed part 21 through the flow hole 22, thereby applying pressure to the second force-bearing part 25. Since the hydraulic oil in the recessed portion 21 is throttled and decelerated, the pressure on the second force-bearing portion 25 is less than the pressure on the first force-bearing portion 24, and the valve core 20 remains in the blocked position. After working for a period of time, the hydraulic oil pressure in the boom control oil circuit 200 increases continuously, and when the pressure on the first force-bearing portion 24 and the second force-bearing portion 25 increases to the same level (or the pressure on the second force-bearing portion 25 is greater than the pressure on the first force-bearing portion 24), the elastic structure 60 pushes the valve core 20 to move to the avoidance position, and the flow of hydraulic oil through the circulation channel 11 returns to normal.

[0042] like Figure 2 and Figure 3 As shown, in the technical solution of this embodiment, a plug 70 is provided at the second end of the valve body 10, a limiting step 23 is provided on the side wall of the valve core 20, and the elastic structure 60 is a spring, and the two ends of the spring are respectively abutted against the plug 70 and the limiting step 23. Specifically, the second end, that is, the right end of the valve body 10 is an open end, and the plug 70 is connected to the second end of the valve body 10 in an interference fit manner. Furthermore, a groove is provided on the left end face of the plug 70, and the right end of the valve core 20 is inserted into the groove. The spring is sleeved on the right end of the valve core 20, and one end of the spring is abutted against the above-mentioned limiting step 23, and the other end is abutted against the bottom wall of the groove. Those skilled in the art combined with Figure 2 and Figure 3 It can be understood that the above-mentioned recessed portion 21 is connected to the space between the limit step 23 and the plug 70. Therefore, when the hydraulic oil enters the recessed portion 21 from the flow hole 22, the hydraulic oil will also enter the space between the limit step 23 and the plug 70, and provide a thrust to the valve core 20 toward the avoidance position.

[0043] like Figure 1As shown, in the technical solution of this embodiment, the valve body 10 and the boom pilot end cover 300 are an integrated structure. Therefore, the hydraulic control valve in this embodiment is integrated on the boom pilot end cover 300. The above structure can save space in the hydraulic control system and reduce the connection pipelines. Of course, in some embodiments not shown, the valve body 10 can also be independent, that is, the outlet of the flow channel 11 on the valve body 10 is connected to the inside of the boom pilot end cover 300 through a pipeline.

[0044] This embodiment also provides a hydraulic control system, including a hydraulic control valve, and the hydraulic control valve is the hydraulic control valve mentioned above.

[0045] According to the above structure, the structure of this application has the following characteristics:

[0046] Compared with the prior art, the present application designs a main valve pilot delay end cover, on which a small logic oil circuit is integrated. During normal operation, the hydraulic oil entering the pilot end cover of the main valve boom lifting action and the digging action of the boom can be normally inlet and return oil separately, but when the two work together, the logic oil circuit can be used to allow the pressure oil to enter the pilot end cover of the main valve boom lifting action slightly before the pilot end cover of the digging action of the boom, thereby achieving priority of related actions and making the leveling effect better.

[0047] Under the condition that the independent operation of the boom and the stick is not affected, the use of the pilot time-delay logic valve (i.e., the hydraulic control valve in the above embodiment) in the end cover is smaller than the use of the priority valve in the prior art, and the oil circuit pressure loss under low pressure is smaller, thereby reducing the oil consumption. At the same time, the above structure also realizes the priority of boom lifting over stick digging, and eliminates the phenomenon of stick hitting the ground when digging, so that the ground leveling effect is better.

[0048] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A hydraulic control valve, characterized in that: include: A valve body (10), wherein a flow channel (11) is provided on the valve body (10), and an accommodating chamber (12) is provided in the valve body (10); a first end of the flow channel (11) is suitable for communicating with a boom control oil circuit (100), and a second end of the flow channel (11) is suitable for communicating with a boom pilot end cover (300); the flow channel (11) is in communication with the accommodating chamber (12) and forms a first through-port (13) and a second through-port (14) on a side wall of the accommodating chamber (12); A valve core (20) is movably arranged in the accommodating cavity (12); a blocking structure (30) is arranged on the valve core (20); the valve core (20) has a avoiding position and a blocking position; when the valve core (20) is in the avoiding position, the blocking structure (30) avoids the first port (13) and the second port (14) and enables the first port (13) and the second port (14) to communicate; when the valve core (20) is in the blocking position, the blocking structure (30) overlaps with at least a portion of the first port (13) and / or the second port (14) to reduce a flow area of ​​the circulation channel (11); The valve core (20) has a first force-bearing portion (24) and a second force-bearing portion (25) which are arranged opposite to each other, the first force-bearing portion (24) being adapted to be in communication with the boom control oil circuit (200) and being subjected to pressure towards the blocking position, and the second force-bearing portion (25) being adapted to be in communication with the circulation channel (11) and being subjected to pressure towards the avoidance position; The second force-bearing portion (25) is used to place the valve core (20) in an avoidance position, thereby preventing the flow passage (11) from being throttled and allowing the boom pilot end cover (300) to achieve normal oil inflow; A flow groove (40) is provided on the side wall of the valve core (20), the first passage (13) and the second passage (14) are both in communication with the flow groove (40), and the blocking structure (30) is arranged in the flow groove (40); The valve body (10) and the boom pilot end cover (300) are an integral structure.

2. The hydraulic control valve according to claim 1, characterized in that: The blocking structure (30) is an annular structure extending along the circumference of the valve core (20).

3. The hydraulic control valve according to claim 1, characterized in that: The first end of the valve body (10) is provided with a joint (50), the joint (50) being suitable for being connected to an external pipeline and communicating with the boom control oil circuit (200), and the end surface of the valve core (20) facing the joint (50) forms the first force-bearing portion (24).

4. The hydraulic control valve according to claim 3, characterized in that: A recessed portion (21) is provided on the end surface of the valve core (20) facing away from the joint (50), and the inner wall of the recessed portion (21) forms the second force-bearing portion (25).

5. The hydraulic control valve according to claim 4, characterized in that: The valve core (20) further comprises a flow hole (22), wherein the flow hole (22) communicates with the flow groove (40) and the recessed portion (21), and the flow hole (22) is located on a side of the blocking structure (30) facing away from the joint (50).

6. The hydraulic control valve according to claim 3, characterized in that: An elastic structure (60) is provided between the second end of the valve body (10) and the valve core (20), and the elastic structure (60) applies an elastic force to the valve core (20) in a direction toward the joint (50).

7. The hydraulic control valve according to claim 6, characterized in that: A plug (70) is provided at the second end of the valve body (10), a limiting step (23) is provided on the side wall of the valve core (20), and the elastic structure (60) is a spring, with two ends of the spring respectively abutting against the plug (70) and the limiting step (23).

8. A hydraulic control system, comprising a hydraulic control valve, characterized in that: The hydraulic control valve is the hydraulic control valve according to any one of claims 1 to 7.

Images