A valve device

Abstract

The utility model relates to a hydraulic technology field, concretely relates to a valve device. A valve device, include: valve body, two installation through -holes are arranged in parallel in the valve body, main valve, the main valve is assembled in one installation through -hole, control valve, two control valves are assembled in another installation through -hole, two oil inlet oil channels are respectively communicated with the corresponding control valve in radial direction, the control valve includes control valve core, the circumferential wall of control valve core forms and has the oil inlet hole and the oil outlet hole, the control valve core inside is provided with one -way structure, one -way structure controls the one -way flow of oil liquid from the oil inlet hole to the oil outlet hole, the control valve core sliding control oil inlet hole and the communication area of oil inlet oil channel, the oil outlet hole with main valve intercommunication. The technical problem that the shell structure of valve device in the prior art is complex, and the processing difficulty is solved.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic technology, specifically to a valve device. Background Technology

[0002] As disclosed in prior art CN110319068B, a valve device with a main spool valve and two control spool valves includes a housing in which the main spool valve is linearly movable relative to a longitudinal axis. A vertical axis extends perpendicular to the longitudinal axis, and a horizontal axis extends perpendicular to both the longitudinal and vertical axes. The housing is constructed in the form of a valve disc, and is made by casting, for example, from gray cast iron or aluminum. The housing has first and second pump channels and first and second tank channels, which pass through the housing along the horizontal axis. The channels are arranged such that when multiple housings are mounted abutting each other along the horizontal axis to obtain a valve block, through channels are created respectively. The first and second control spool valves are inserted into the housing from opposite sides. The first and second control spool valves fluid-tightly close respectively the assigned first or second valve seat. The first and second pump channels are connected at their ends to the respectively assigned first or second control spool valves. As a result, pressurized fluid can be guided from the first pump channel via the first valve seat and further via the connecting channel to the main spool valve, wherein pressurized fluid can also be guided from the second pump channel via the second valve seat and further via the connecting channel to the main spool valve. Preferably, separate pumps can be connected to the first and second pump channels respectively, so that the first and second control spool valves can be used to respectively set which fluid flow is provided by these two pumps for supplying the actuator of the dispensing valve assembly.

[0003] The valve device described above can control the oil supply from the two pump channels to the main slide valve. However, the pressurized oil from the two pump channels enters from the axial ends of the two control slide valves. The two control slide valves need to be assembled in two blind holes, which increases the machining difficulty of the mounting holes inside the housing. Utility Model Content

[0004] To address the technical problems of complex housing structures and difficult manufacturing in existing valve devices, this utility model provides a valve device that solves the aforementioned technical problems.

[0005] The technical solution of this utility model is as follows:

[0006] This utility model provides a valve device, including:

[0007] The valve body has two mounting through holes arranged side by side inside the valve body;

[0008] The main valve is assembled in a mounting through hole;

[0009] The control valve comprises two valves, which are assembled in another mounting through hole. Two oil inlet passages are radially connected to the corresponding control valves. Each control valve includes a control valve core with an oil inlet hole and an oil outlet hole formed on its circumferential wall. The control valve core has a one-way structure inside, which controls the one-way flow of oil from the oil inlet hole to the oil outlet hole. The control valve core slides to control the communication area between the oil inlet hole and the oil inlet passage. The oil outlet hole is connected to the main valve.

[0010] According to one embodiment of the present invention, two control valves are symmetrically and spaced apart and assembled in the mounting through hole. Both control valve cores are slidably fitted with the mounting through hole. The adjacent ends of the two control valve cores are closed. The control valve core has an inner cavity. The oil inlet and the oil outlet are both connected to the inner cavity. In the initial state, the one-way structure abuts against the inner surface of the control valve core and blocks the oil inlet and the oil outlet.

[0011] According to one embodiment of the present invention, the one-way structure includes a one-way valve core and an elastic element. The one-way valve core is provided with an internal oil passage, the elastic element is located in a spring cavity, and the oil outlet is connected to the spring cavity through the internal oil passage.

[0012] According to one embodiment of the present invention, the oil inlet holes are provided in multiple ways, and the multiple oil inlet holes are distributed along both the circumferential and axial directions.

[0013] According to one embodiment of the present invention, the control valve is further provided with a pilot valve, which is mounted on two mounting seats. The two mounting seats are respectively located at the outer ends of the two control valve cores and cover the ends of the control valve cores. A pilot cavity is formed between the mounting seats and the control valve cores, and the pilot valve controls the inlet and outlet of oil in the pilot cavity.

[0014] According to one embodiment of the present invention, with the axis of the main valve as the longitudinal axis, the transverse axis is oriented perpendicular to the longitudinal axis, and the vertical axis is oriented perpendicular to both the longitudinal and transverse axes. The main valve and the control valve are arranged along the vertical axis. The valve body has a first sealing plane and a second sealing plane oriented perpendicular to the transverse axis. Two oil inlet passages penetrate the valve body along the transverse axis. The first sealing plane and the second sealing plane are provided with first sealing surfaces corresponding to the two oil inlet passages.

[0015] According to one embodiment of the present invention, the valve body is further provided with two return oil passages, which are connected to the mounting hole where the main valve is located. The two return oil passages pass through the valve body along the transverse axis and are spaced apart along the longitudinal axis. The two pilot valves are provided with two sets of pilot oil passages, which are spaced apart along the longitudinal axis. The first sealing plane and the second sealing plane are provided with two second sealing surfaces corresponding to the two return oil passages and the two sets of pilot oil passages.

[0016] According to one embodiment of the present invention, a connecting hole is also formed on the valve body, the connecting hole passes through the valve body along the transverse axis, and a third sealing surface is provided on the first sealing plane and the second sealing plane corresponding to the connecting hole.

[0017] According to one embodiment of the present invention, the valve body is provided with a connecting oil passage, and two control valves are connected to the main valve through the connecting oil passage. The connecting oil passage includes two branch oil passages and one confluence oil passage. One end of the two branch oil passages is radially connected to the two control valves respectively, and the other end of the two branch oil passages is connected to the confluence oil passage. The confluence oil passage is radially connected to the main valve.

[0018] According to one embodiment of the present invention, unloading oil passages are provided between the two branch oil passages and the adjacent valve body end faces, and on the valve body between the two control valves. The unloading oil passages are connected to the mounting through holes where the control valves are located.

[0019] Based on the above technical solution, the technical effects that this utility model can achieve are as follows:

[0020] 1. The valve device of this utility model requires only two mounting holes in the valve body to install the main valve and two control valves, which facilitates the processing of the valve body structure; the oil inlet passage is radially connected to the control valve, without needing to enter the control valve from the end of the control valve, so the two control valves can be installed in the same mounting hole, instead of being set in a blind hole; by controlling the overall sliding of the control valve to control the communication area between the oil inlet hole and the oil inlet passage, the flow rate of the oil inlet passage into the control valve can be controlled; the oil pressure entering the control valve flows to the oil outlet through the one-way structure, and then flows to the main valve. That is, by controlling the position of the control valve, the oil volume from the oil inlet passage to the main valve can be directly set. The control method is simple and accurate, and the one-way structure can prevent the oil from flowing backward.

[0021] 2. The valve device of this utility model, with its structure of two control valve cores and their assembly within the mounting through holes, allows the oil to flow radially from the control valve cores through a one-way structure and then radially out, avoiding the axial inflow and radial outflow of the prior art. The direction of the fluid flow changes significantly (usually a 90-degree turn). According to the momentum theorem, this change in flow direction leads to a change in fluid flow rate, thereby generating an axial force on the valve core, i.e., hydraulic force. This axial hydraulic force is detrimental to the performance of the hydraulic system; it increases the operating force required to move the spool valve, reduces the sensitivity of the spool valve, and sometimes even causes system vibration. Multiple oil inlets are provided, distributed both circumferentially and axially, facilitating continuous adjustment of the opening area.

[0022] 3. The valve device of this utility model, by setting a specific one-way structure, can realize that when the pressure of the oil outlet is higher than the pressure of the oil inlet, the oil in the oil outlet can enter the spring cavity through the internal oil passage to form back pressure, so that the one-way valve core cannot be opened.

[0023] 4. The valve device of this utility model has a mounting base that can seal the end of the control valve core on the one hand, and can be used for the assembly of the pilot valve on the other hand. The pilot valve is assembled on the mounting base to control the oil inlet and outlet of the pilot chamber, thereby controlling the position of the control valve core in the mounting through hole, which can control the opening area between the oil inlet hole and the oil inlet passage.

[0024] 5. The valve device of this utility model, through the setting of the first sealing plane and the second sealing plane, as well as the setting of each oil passage in the valve body, facilitates the stacking and assembly of multiple valve devices. Multiple sealing surfaces are in close contact with each other, and the valve devices are fastened by fasteners passing through the connecting holes. The tension generated by the fasteners is transmitted only through multiple sealing surfaces, thereby generating a large surface pressure on the sealing surfaces and thus producing a good seal.

[0025] 6. In the valve device of this utility model, unloading oil passages are provided between the branch oil passages and the adjacent valve body end faces, and on the valve bodies between the two control valves. The unloading oil passages are connected to the mounting through holes where the control valves are located, which can eliminate pressure buildup caused by leakage, thereby avoiding affecting the control effect of the control valves. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the valve device of this utility model;

[0027] Figure 2 This is a sectional view of the valve assembly;

[0028] Figure 3 for Figure 1 DD cross-section;

[0029] Figure 4 for Figure 3 EE cross-section;

[0030] Figure 5 for Figure 2 A magnified view of a portion of the image;

[0031] Figure 6 for Figure 5 Enlarged view of part F;

[0032] Figure 7 for Figure 5 Enlarged view of part G;

[0033] Figure 8 A schematic diagram of the structure of the first valve core of the first control valve;

[0034] In the diagram: 1-Valve body; 11-First mounting through hole; 12-Second mounting through hole; 131-First oil inlet passage; 132-Second oil inlet passage; 141-First oil return passage; 142-Second oil return passage; 15-Connecting passage; 151-First branch passage; 152-Second branch passage; 153-Merging passage; 161-First unloading passage; 162-Second unloading passage; 163-Third unloading passage; 17 1-First pilot oil passage; 1711-First pilot inlet oil passage; 1712-First pilot return oil passage; 172-Second pilot oil passage; 1721-Second pilot inlet oil passage; 1722-Second pilot return oil passage; 181-First working oil passage; 182-Second working oil passage; 19-Connecting hole; 101-First sealing surface; 102-Second sealing surface; 103-Third sealing surface; 2-Main valve; 31-First Control valve; 311-First control valve core; 3111-First oil inlet; 3112-First oil outlet; 3113-First inner cavity; 312-First plug; 313-First spring; 32-Second control valve; 321-Second control valve core; 3211-Second oil inlet; 3212-Second oil outlet; 3213-Second inner cavity; 322-Second plug; 323-Second spring; 41-First one-way structure; 4 11-First one-way valve core; 4111-First internal oil passage; 412-First elastic element; 42-Second one-way structure; 421-Second one-way valve core; 4211-Second internal oil passage; 422-Second elastic element; 51-First mounting base; 511-First pilot chamber; 52-Second mounting base; 521-Second pilot chamber; 61-First pilot valve; 62-Second pilot valve; 71-First end cap; 72-Second end cap. Detailed Implementation

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0036] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0037] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0038] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0039] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0040] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0041] like Figure 1-8 As shown, this embodiment provides a valve device, including a valve body 1. The valve body 1 is provided with a main valve 2 and two control valves. The valve body 1 has two mounting through holes arranged side by side. The main valve 2 is installed in one mounting through hole, and the two control valves are symmetrically and spaced apart in the other mounting through hole. The valve body 1 is also provided with two oil inlet passages for introducing pressurized oil. The two control valves and the main valve 2 are connected by a connecting oil passage 15. The two control valves are respectively arranged corresponding to the two oil inlet passages, and the two control valves respectively control the connection between the corresponding oil inlet passage and the connecting oil passage 15.

[0042] like Figure 2-3 As shown, the valve body 1 is block-shaped and has a vertical axis a, a longitudinal axis b, and a transverse axis c. The longitudinal axis b is perpendicular to the vertical axis a, and the transverse axis c is perpendicular to both the vertical axis a and the longitudinal axis b. The valve body 1 has two mounting through holes, namely a first mounting through hole 11 and a second mounting through hole 12. The first mounting through hole 11 and the second mounting through hole 12 are distributed along the vertical axis a and are arranged in parallel.

[0043] like Figure 1-3 As shown, the valve body 1 has a first sealing plane and a second sealing plane oriented perpendicular to the transverse axis c. Multiple oil passages are formed within the valve body 1. Specifically, two inlet oil passages are formed within the valve body 1: a first inlet oil passage 131 and a second inlet oil passage 132, which respectively introduce first pressure oil and second pressure oil. Two return oil passages are also formed within the valve body 1: a first return oil passage 141 and a second return oil passage 142, which are used for the return oil from the main valve 2. Two working oil passages are also formed within the valve body 1: a first working oil passage 181 and a second working oil passage 182. A connecting oil passage 15 is also formed within the valve body 1, connecting the first mounting through hole 11 and the second mounting through hole 12. In use, the two oil inlet passages introduce pressurized oil to the corresponding control valves. The control valves control the pressurized oil to enter the connecting oil passage 15 as needed, and then reach the main valve 2 through the connecting oil passage 15. The main valve 2 slides to control the oil inlet of one working oil passage and the return of the other working oil passage.

[0044] As a preferred technical solution in this embodiment, two oil inlet passages are respectively provided for two control valves, and the two oil inlet passages are radially connected to the corresponding control valves.

[0045] As a preferred technical solution of this embodiment, the first oil inlet channel 131 and the second oil inlet channel 132 are arranged side by side. The first oil inlet channel 131 and the second oil inlet channel 132 penetrate the valve body 1 along the transverse axis c. The first oil inlet channel 131 and the second oil inlet channel 132 are arranged adjacent to each other and slightly spaced along the longitudinal axis b. The first sealing surface 101 is provided on the first sealing plane and the second sealing plane corresponding to the two oil inlet channels.

[0046] As a preferred embodiment, both the first return oil passage 141 and the second return oil passage 142 are connected to the first mounting through hole 11 where the main valve 2 is located, and the first return oil passage 141 and the second return oil passage 142 are spaced apart along the longitudinal axis b. The first return oil passage 141 and the second return oil passage 142 penetrate the valve body 1 along the transverse axis c, and a second sealing surface 102 is provided on the first sealing plane and the second sealing plane corresponding to the two return oil passages.

[0047] As a preferred embodiment, the connecting oil passage 15 includes two branch oil passages and a confluence oil passage 153. The two branch oil passages are a first branch oil passage 151 and a second branch oil passage 152. One end of the first branch oil passage 151 is radially connected to the first control valve 31, and one end of the second branch oil passage 152 is radially connected to the second control valve 32. The other ends of both the first branch oil passage 151 and the second branch oil passage 152 are connected to the confluence oil passage 153, which is radially connected to the main valve 2. The two control valves control the oil from the two inlet oil passages to enter the two branch oil passages. The oil from the two branch oil passages merges in the confluence oil passage 153 and is then supplied to the main valve 2.

[0048] As a preferred technical solution of this embodiment, the merging oil passage 153 can be disposed in the middle of the valve body 1 along the longitudinal axis b, the first working oil passage 181 and the second working oil passage 182 can be arranged on both sides of the merging oil passage 153, and the first return oil passage 141 and the second return oil passage 142 are arranged on both sides of the two working oil passages.

[0049] As a preferred embodiment, the valve body 1 is further provided with connecting holes 19. Multiple connecting holes 19 can be provided, and each connecting hole 19 penetrates the valve body along the transverse axis c, facilitating the assembly of multiple valve bodies 1. In this embodiment, three connecting holes 19 are provided, arranged in an isosceles triangle. One connecting hole 19 is located on the side of the main valve 2 away from the control valve 3, and at the midpoint of the longitudinal axis b of the valve body 1. Two connecting holes 19 are symmetrically arranged on the side of the control valve 3 away from the main valve 2. Preferably, a third sealing surface 103 is provided on the first sealing plane and the second sealing plane of the valve body 1 corresponding to the connecting holes 19. The third sealing surface 103 can be provided in a one-to-one correspondence with each connecting hole 19.

[0050] like Figure 2As shown, the main valve 2 is installed in the first mounting through hole 11. The main valve 2 includes a main valve core, which is slidably assembled. Both ends of the main valve core extend out of the valve body 1. A first end cap 71 is fixed to one side wall of the valve body 1 and covers the first end of the main valve core. A second end cap 72 is fixed to the other side wall of the valve body 1 and covers the second end of the main valve core. The main valve core can be reversed under the action of a hydraulic drive structure, an electric drive structure, or an electro-hydraulic drive structure.

[0051] like Figure 2 , 5 As shown, the control valve is installed in the second mounting through hole 12. There are two control valves, namely the first control valve 31 and the second control valve 32. The first control valve 31 and the second control valve 32 are symmetrically and spaced apart in the second mounting through hole 12. The first control valve 31 controls the flow of oil from the first oil inlet passage 131 to the first branch oil passage 151, and the second control valve 32 controls the flow of oil from the second oil inlet passage 132 to the second branch oil passage 152.

[0052] like Figure 6 , 8 As shown, the first control valve 31 includes a first control valve core 311. A first oil inlet hole 3111 and a first oil outlet hole 3112 are formed on the circumferential wall of the first control valve core 311. A first inner cavity 3113 is formed inside the first control valve core 3111, and the first oil inlet hole 3111 and the first oil outlet hole 3112 are connected through the first inner cavity 3113. There are multiple first oil inlets 3111, distributed along both the axial and circumferential directions of the first control valve core 311. When the first control valve 31 slides within the second mounting through hole 12, the first control valve core 311 is in different positions, which can control the different communication areas between the first oil inlet hole 3111 and the first oil inlet passage 131. The first oil outlet hole 3112 remains connected to the first branch oil passage 151. Thus, by adjusting the position of the first control valve 31, the oil flow from the first oil inlet passage 131 to the first branch oil passage 151 can be controlled.

[0053] As a preferred technical solution in this embodiment, for ease of assembly, the first control valve core 311 has a structure with one end closed and the other end open. A first screw plug 312 is installed at the opening of the first control valve core 311 so that the first inner cavity 3113 is in a relatively closed state. The closed end of the first control valve core 311 is located inside the second mounting through hole 12, and the open end of the first control valve core 311 extends out of the valve body 1.

[0054] As a preferred technical solution in this embodiment, such as Figure 8As shown, the circumferential wall of the first control valve core 311 has multiple first oil inlet holes 3111 and first oil outlet holes 3112. The first oil inlet holes 3111 can be configured as multiple sets of oil inlet holes of different specifications. Multiple oil inlet holes in the same set are the same size and are evenly distributed along the circumference. The oil inlet holes in different sets are different sizes and are staggered in both the axial and circumferential directions to accommodate various changes in opening area. The first oil outlet holes 3112 can be configured as a set and distributed along the circumference. The first oil outlet holes 3112 can have a certain axial length to ensure that they are always connected to the first branch oil passage 151.

[0055] As a preferred technical solution in this embodiment, a first mounting seat 51 is assembled on the outer wall of the valve body 1. The first mounting seat 51 covers one end of the opening of the first control valve core 311. A first pilot cavity 511 is formed between the first mounting seat 51 and the first screw plug 312. The position of the first control valve 31 can be controlled by controlling the inlet and outlet of the pilot oil in the first pilot cavity 511.

[0056] As a preferred embodiment, the first control valve 31 further includes a first spring 313, which provides an initial force to the first control valve core 311 to keep it in its initial state. Specifically, the first spring 313 is sleeved on the outside of the first control valve core 311 and located outside the valve body 1. One end of the first spring 313 acts on the valve body 1, and the other end acts on the first screw plug 312, so that in the initial state, the first screw plug 312 abuts against the inner wall of the first mounting base 51 under the action of the first spring 313. At this time, the first oil inlet hole 3111 and the first oil inlet passage 131 may not be connected or may be connected over a small area.

[0057] like Figure 7 As shown, the second control valve 32 includes a second control valve core 321, a second plug 322, and a second spring 323. The second control valve core 321 has a structure with one end closed and the other end open. The second plug 322 is installed at the opening of the second control valve core 321 to make the interior of the second control valve 32 relatively closed. The second spring 323 provides the initial force. A second oil inlet hole 3211 and a second oil outlet hole 3212 are formed on the circumferential wall of the second control valve core 321. A second inner cavity 3213 is formed inside the second control valve core 3211, and the second oil inlet hole 3211 and the second oil outlet hole 3212 are connected through the second inner cavity 3213. There are multiple second oil inlet holes 3211, which are distributed along the axial and circumferential directions of the second control valve core 321. When the second control valve 32 slides in the second mounting through hole 12, the second control valve core 321 is in different positions, which can control the different communication areas between the second oil inlet hole 3211 and the second oil inlet passage 132. The second oil outlet hole 3212 is kept in communication with the second branch passage 152. In this way, the amount of oil from the second oil inlet passage 132 to the second branch passage 152 can be controlled by adjusting the position of the second control valve 32.

[0058] The second mounting base 52 is assembled on the valve body 1 and covers the end of the second control valve 32. A second pilot chamber 521 is formed between the second mounting base 52 and the second screw plug 322. The position of the second control valve 32 can be controlled by controlling the inlet and outlet of the pilot oil in the second pilot chamber 521. In the initial state, under the action of the second spring 323, the second screw plug 322 of the second control valve 32 abuts against the inner wall of the second mounting base 52. At this time, the second oil inlet hole 3211 and the second oil inlet passage 132 may not be connected or may be connected in a small area. The structure of the second control valve 32 is the same as that of the first control valve 31, and will not be described again here.

[0059] like Figure 5-7 As shown, the two control valves are also equipped with one-way structures inside. The first control valve 31 is equipped with a first one-way structure 41, which controls the oil to flow unidirectionally from the first oil inlet 3111 to the first oil outlet 3112. The second control valve 32 is equipped with a second one-way structure 42, which controls the oil to flow unidirectionally from the second oil inlet 3211 to the second oil outlet 3212.

[0060] Specifically, the first one-way structure 41 is assembled in the first inner cavity 3113 of the first control valve 31. The first one-way structure 41 includes a first one-way valve core 411 and a first elastic element 412. The first one-way valve core 411 can slide in the first inner cavity 3113. The first elastic element 412 is located between the first screw plug 312 and the first one-way valve core 411. In the initial state, under the action of the first elastic element 412, the first one-way valve core 411 can abut against the inner wall of the first control valve core 311, blocking the connection between the first oil inlet hole 3111 and the first oil outlet hole 3112. When the pressure oil of the first oil inlet passage 131 enters the first inner cavity 3113 through the first oil inlet hole 3111, it can overcome the force of the first elastic element 412 and push the first one-way valve core 411 to slide open. The pressure oil can reach the first oil outlet hole 3112 and then enter the first branch oil passage 151.

[0061] Specifically, the second one-way structure 42 is assembled in the second inner cavity 3213 of the second control valve 32. The second one-way structure 42 includes a second one-way valve core 421 and a second elastic element 422. The second one-way valve core 421 can slide in the second inner cavity 3213. The second elastic element 422 is located between the second screw plug 322 and the second one-way valve core 421. In the initial state, under the action of the second elastic element 422, the second one-way valve core 421 can abut against the inner wall of the second control valve core 321, blocking the communication between the second oil inlet hole 3211 and the second oil outlet hole 3212. When the pressure oil of the second oil inlet passage 132 enters the second inner cavity 3213 through the second oil inlet hole 3211, it can overcome the force of the second elastic element 422 and push the second one-way valve core 421 to slide open. The pressure oil can reach the second oil outlet hole 3212 and then enter the second branch oil passage 152.

[0062] As a preferred embodiment, both one-way valve cores are provided with internal oil passages. The first one-way valve core 411 is provided with a first internal oil passage 4111. The first oil outlet 3112 is connected to the first spring cavity where the first elastic member 412 is located via the first internal oil passage 4111. If the oil pressure on the first branch oil passage 151 is higher than the oil pressure on the first inlet oil passage 131, the oil in the first branch oil passage 151 can enter the first spring cavity via the first internal oil passage 4111, forming back pressure. The first one-way valve core 411 has no... The second one-way valve core 421 is provided with a second internal oil passage 4211. The second oil outlet 3212 is connected to the second spring cavity where the second elastic element 422 is located through the second internal oil passage 4211. If the oil pressure on the second branch oil passage 152 is higher than the oil pressure on the second inlet oil passage 132, the oil in the second branch oil passage 152 can enter the second spring cavity through the second internal oil passage 4211, forming back pressure. The second one-way valve core 421 cannot be opened, and the oil will not flow in reverse.

[0063] like Figure 2 , 5 As shown, the pilot valve is used to control the state of the control valve. There are two pilot valves, namely the first pilot valve 61 and the second pilot valve 62. The first pilot valve 61 controls the oil inlet and outlet of the first pilot chamber 511, thereby controlling the position of the first control valve 31; the second pilot valve 62 controls the oil inlet and outlet of the second pilot chamber 521, thereby controlling the position of the second control valve 32.

[0064] As a preferred embodiment, the first pilot valve 61 is mounted on the first mounting base 51, and the second pilot valve 62 is mounted on the second mounting base 52. The first pilot valve 61 and the second pilot valve 62 can be staggered along the transverse axis c.

[0065] As a preferred technical solution of this embodiment, a first set of pilot oil passages 171 is also provided near the first mounting seat 51 of the valve body 1. The first set of pilot oil passages 171 includes a first pilot inlet oil passage 1711 and a first pilot return oil passage 1712. An oil passage is formed in the first mounting seat 51 to facilitate communication between the first pilot inlet oil passage 1711 and the first pilot return oil passage 1712 and the valve core of the first pilot valve 61. A second set of pilot oil passages 172 is provided near the second mounting seat 52 of the valve body 1. The second set of pilot oil passages 172 includes a second pilot inlet oil passage 1721 and a second pilot return oil passage 1722. An oil passage is formed in the second mounting seat 52 to facilitate communication between the second pilot inlet oil passage 1721 and the second pilot return oil passage 1722 and the valve core of the second pilot valve 62.

[0066] As a preferred technical solution of this embodiment, at least one end of the first set of pilot oil passages 171 and the second set of pilot oil passages 172 penetrates the valve body 1 along the transverse axis c. The two sets of pilot oil passages are spaced apart along the longitudinal axis and are respectively located close to the two return oil passages. Two second sealing surfaces 102 are provided on the first sealing plane and the second sealing plane corresponding to the two return oil passages and the two sets of pilot oil passages.

[0067] like Figure 2-5 As shown, to ensure the control effect of the control valves, an unloading oil passage is provided inside the valve body 1. Along the longitudinal axis b, unloading oil passages are provided between the two branch oil passages and the end faces of adjacent valve bodies 1, and an unloading oil passage is also provided between the two control valves. Specifically, a first unloading oil passage 161 is provided between the first branch oil passage 151 and the end face of the adjacent valve body 1. One end of the first unloading oil passage 161 is connected to the second mounting through hole 12, and the other end can be connected to the first return oil passage 141. Oil leaking from the first branch oil passage 151 can flow out through the first unloading oil passage 161. A second unloading oil passage 162 is provided between the second branch oil passage 152 and the end face of the adjacent valve body 1. One end of the second unloading oil passage 162 is connected to the second mounting through hole 12, and the other end can be connected to the second return oil passage 142. Oil leaking from the second branch oil passage 152 can flow out through the first unloading oil passage 161. The oil can flow out through the second unloading oil passage 162; a third unloading oil passage 163 is provided between the first control valve 31 and the second control valve 32. One end of the third unloading oil passage 163 is connected to the second mounting through hole 12 between the first control valve 31 and the second control valve 32. The third unloading oil passage 163 is also connected to the first pilot return oil passage 1712 and / or the second pilot return oil passage 1722. The third unloading oil passage 163 can unload the leaked oil from the first oil inlet passage 131 and the second oil inlet passage 132 to the first pilot return oil passage 1712 and / or the second pilot return oil passage 1722.

[0068] Based on the above technical solution, the valve device of this embodiment operates as follows: the first oil inlet passage 131 and the second oil inlet passage 132 are respectively connected to pressurized oil; the first pilot valve 61 controls the oil inlet and outlet of the first pilot chamber 51 to control the position of the first control valve 31; the pressurized oil introduced into the first oil inlet passage 131 enters the first inner cavity 3113 through the first oil inlet hole 3111, pushing the first one-way valve core 411 to slide open, and the pressurized oil flows to the first branch oil passage 151 through the first oil outlet hole 3112; the second pilot valve 62 controls the oil inlet and outlet of the second pilot chamber 52 to control the position of the second control valve 32; the pressurized oil introduced into the second oil inlet passage 132 enters the second inner cavity 3213 through the second oil inlet hole 3211, pushing the second one-way valve core 421 to slide open, and the pressurized oil flows to the second branch oil passage 152 through the second oil outlet hole 3212. The pressure oil from the first branch oil passage 151 and the pressure oil from the second branch oil passage 152 merge through the confluence oil passage 153 and reach the main valve 2. The main valve 2 slides to control the oil intake of one working oil passage and the return of the other working oil passage.

[0069] The first pilot valve 61 can control the position of the first control valve 31 within the second mounting through hole 12 as needed, thereby adjusting the communication area between the first oil inlet hole 3111 and the first oil inlet passage 131, and thus adjusting the oil supply of the first oil inlet passage 131. The second pilot valve 62 can control the position of the second control valve 32 within the second mounting through hole 12 as needed, thereby adjusting the communication area between the second oil inlet hole 3211 and the second oil inlet passage 132, and thus adjusting the oil supply of the second oil inlet passage 132. The first one-way valve core 411 and the second one-way valve core 421 always function to control unidirectional flow.

[0070] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A valve device, characterized in that, include: Valve body (1), wherein two mounting through holes are arranged side by side inside the valve body (1); The main valve (2) is assembled in a mounting through hole; The control valve consists of two valves, which are assembled in another mounting through hole. Two oil inlet passages are respectively connected to the corresponding control valves in the radial direction. The control valve includes a control valve core. An oil inlet hole and an oil outlet hole are formed on the circumferential wall of the control valve core. The control valve core is provided with a one-way structure inside. The one-way structure controls the one-way flow of oil from the oil inlet hole to the oil outlet hole. The control valve core slides to control the communication area between the oil inlet hole and the oil inlet passage. The oil outlet hole is connected to the main valve (2).

2. The valve device according to claim 1, characterized in that, Two control valves are symmetrically and spaced apart and assembled in the mounting through hole. Both control valve cores are slidably fitted with the mounting through hole. The adjacent ends of the two control valve cores are closed. The control valve core has an inner cavity. The oil inlet and the oil outlet are both connected to the inner cavity. In the initial state, the one-way structure abuts against the inner surface of the control valve core and blocks the oil inlet and the oil outlet.

3. A valve device according to claim 2, characterized in that, The one-way structure includes a one-way valve core and an elastic element. The one-way valve core has an internal oil passage, the elastic element is located in the spring cavity, and the oil outlet is connected to the spring cavity through the internal oil passage.

4. A valve device according to any one of claims 1-3, characterized in that, The oil inlet holes are configured as multiple, and the multiple oil inlet holes are distributed along both the circumferential and axial directions.

5. A valve device according to claim 1, characterized in that, The control valve is also provided with a corresponding pilot valve. The pilot valve is installed on two mounting seats, which are located at the outer ends of the two control valve cores and cover the ends of the control valve cores. A pilot cavity is formed between the mounting seats and the control valve cores. The pilot valve controls the inlet and outlet of oil in the pilot cavity.

6. A valve device according to claim 5, characterized in that, With the axis of the main valve (2) as the longitudinal axis b, the transverse axis c is perpendicular to the longitudinal axis b, and the vertical axis a is perpendicular to the longitudinal axis b and the transverse axis c. The main valve (2) and the control valve are arranged along the vertical axis a. The valve body (1) has a first sealing plane and a second sealing plane perpendicular to the transverse axis c. Two oil inlet passages pass through the valve body (1) along the transverse axis. The first sealing plane and the second sealing plane are provided with a first sealing surface (101) corresponding to the two oil inlet passages.

7. A valve device according to claim 6, characterized in that, The valve body (1) is also provided with two return oil passages. The two return oil passages are connected to the mounting hole where the main valve (2) is located. The two return oil passages pass through the valve body (1) along the horizontal axis c. The two return oil passages are spaced apart along the longitudinal axis b. The two pilot valves are provided with two sets of pilot oil passages. The two sets of pilot oil passages are spaced apart along the longitudinal axis b. The first sealing plane and the second sealing plane are provided with two second sealing surfaces (102) corresponding to the two return oil passages and the two sets of pilot oil passages.

8. A valve device according to claim 6, characterized in that, A connecting hole is also formed on the valve body (1), and the connecting hole passes through the valve body (1) along the transverse axis c. A third sealing surface (103) is provided on the first sealing plane and the second sealing plane corresponding to the connecting hole.

9. A valve device according to claim 1, characterized in that, The valve body (1) is provided with a connecting oil passage (15). Two control valves are connected to the main valve (2) through the connecting oil passage (15). The connecting oil passage (15) includes two branch oil passages and one confluence oil passage (153). One end of the two branch oil passages is radially connected to the two control valves respectively, and the other end of the two branch oil passages is connected to the confluence oil passage (153). The confluence oil passage (153) is radially connected to the main valve (2).

10. A valve device according to claim 9, characterized in that, Between the two branch oil passages and the end face of the adjacent valve body (1), and on the valve body (1) between the two control valves, there are unloading oil passages, which are connected to the mounting through hole where the control valve is located.

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