A double throttle valve control module and a hydraulic system

Abstract

The present invention relates to the field of hydraulic technology, and particularly relates to a double throttle valve control module and a hydraulic system. A double throttle valve control module includes: a valve body provided with a plurality of oil ports; a throttle valve assembly, with two sets of throttle valve assemblies symmetrically arranged in the valve body. The throttle valve assembly includes a valve core, and the valve cores form an abutment under the action of elastic members to block the communication between the oil ports; a driving member located between the two sets of throttle valve assemblies, with gaps left between the two ends of the driving member and the two valve cores respectively, and the driving member pushes one-sided valve core to open to control the opening degree. A hydraulic system includes: a hydraulic cylinder; a double throttle valve control module, where one set of throttle valve assemblies controls the lifting of the hydraulic cylinder, and the other set of throttle valve assemblies controls the lowering of the hydraulic cylinder. It solves the technical problems in the prior art that each throttle valve needs to be provided with a corresponding driving device, occupying a large space; or the shared driving device will cause linkage between the throttle valves and cannot be independently controlled.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulics, and particularly to a dual throttle valve control module and a hydraulic system. Background Art

[0002] In a hydraulic system, a two-position two-way throttle valve is a very commonly used control component for controlling the on-off between two oil ports and the flow area of the valve port. However, when performing motion control on an actuator such as a lifting hydraulic cylinder, two or even more two-position two-way throttle valves are often required. A common solution is to use multiple plate-type two-position two-way throttle valves, or to install multiple two-position two-way throttle valve inserts on an integrated valve block. In this way, whether the throttle valve is manually driven or solenoid-driven, the entire control system will require multiple driving devices, which not only occupy a large amount of space but also have a high cost.

[0003] There is another way to control multiple valve ports with fewer driving devices, that is, a multi-position multi-way reversing valve (such as a two-position three-way or three-position four-way reversing valve). However, this reversing valve uses a single spool to control the on-off of multiple oil ports, and all valve ports are linked and coupled, without the function of independently controlling the areas of multiple valve ports. Summary of the Invention

[0004] In order to solve the technical problems in the prior art that each throttle valve needs to be provided with a corresponding driving device, occupying a large amount of space; or the shared driving device will cause linkage between throttle valves and cannot be independently controlled, the present invention provides a dual throttle valve control module and a hydraulic system, which solve the above technical problems.

[0005] In order to solve the above technical problems, the present invention provides a dual throttle valve control module, comprising:

[0006] A valve body, on which a plurality of oil ports are provided;

[0007] A throttle valve assembly, which is divided into two groups and symmetrically arranged in the valve body. The throttle valve assembly includes a spool, and the spool forms a abutment under the action of an elastic member to block the connection between the oil ports;

[0008] A driving member, which is located between the two groups of throttle valve assemblies. There are gaps between the two ends of the driving member and the two spools respectively, and the driving member pushes one side of the spool to open to control the opening degree.

[0009] According to an embodiment of the present invention, a through hole communicating with both ends is formed in the spool, an oil flow groove is formed in the driving member, and the cavity between the spool and the driving member is communicated with the oil return port through the oil flow groove.

[0010] According to an embodiment of the present invention, the middle part of the driving member has a reduced size and is connected to the oil return port. The two ends of the driving member form the flow-through grooves, and the flow-through grooves extend from the end face of the driving member to the middle part of the driving member.

[0011] According to an embodiment of the present invention, the flow-through grooves include radial grooves located at the end face of the driving member and axial grooves located on the outer peripheral surface of the driving member.

[0012] According to an embodiment of the present invention, the driving member makes an axial reciprocating motion driven by a driving device. Teeth are formed in the middle part of the driving member, and the driving device drives the driving member through a gear set.

[0013] According to an embodiment of the present invention, the gear set includes a first gear shaft and a second gear shaft. A large gear and a first small gear are coaxially arranged on the first gear shaft. A second small gear is arranged on the second gear shaft. The first small gear meshes with the driving member, the large gear meshes with the second small gear, and the second small gear is externally driven.

[0014] According to an embodiment of the present invention, the throttle valve assembly further includes a valve sleeve and a plug. The valve sleeve and the plug are arranged in the valve body. One end of the valve core close to the driving member is in sliding fit with the valve sleeve, and the other end of the valve core slides along the plug. A conical surface is formed on the outer surface of the valve core and abuts against the valve sleeve.

[0015] According to an embodiment of the present invention, the outer diameters of both ends of the valve core and the diameters corresponding to the positions where the valve core abuts are equal.

[0016] The present invention also provides a hydraulic system, including:

[0017] A hydraulic cylinder;

[0018] A double throttle valve control module. One group of the throttle valve assemblies controls the lifting of the hydraulic cylinder, and the other group of throttle valve assemblies controls the lowering of the hydraulic cylinder.

[0019] According to an embodiment of the present invention, an oil inlet and an oil outlet are provided on the valve body for each group of throttle valve assemblies. One oil inlet introduces pressure oil, and the corresponding oil outlet is unidirectionally connected to the rodless cavity of the hydraulic cylinder; the other oil inlet is connected to the rodless cavity of the hydraulic cylinder, and the corresponding oil outlet is connected to the fuel tank.

[0020] Based on the above technical solutions, the technical effects that the present invention can achieve are:

[0021] 1. In the dual throttle valve control module of the present invention, the driving member is located between two groups of throttle valve assemblies, with a gap left between it and the two valve cores. When the driving member moves to one side, it can push the valve core on that side to open and control the opening degree, while the throttle valve assembly on the other side remains in the initial state; when the driving member moves to the other side, it can push the valve core on the other side to open and control the opening degree, while the valve core on one side remains in the initial state. That is, the driving member can control the opening degrees of the throttle valve assemblies on both sides, and when the driving member controls the opening degree of one group of throttle valve assemblies, it will not cause the linkage of the other group of throttle valve assemblies, enabling independent control of the two groups of throttle valve assemblies;

[0022] 2. In the dual throttle valve control module of the present invention, by providing a through hole communicating both ends formed in the valve core, the pressures at both ends of the valve core can be ensured to be the same; an overflow groove is formed on the driving member, and the cavity between the valve core and the driving member is communicated with the oil return port through the overflow groove, so both ends of the valve core are in a low-pressure and connected state, and the movement of the valve core will not be affected by the uneven pressures on both sides, with the valve core responding quickly and accurately; further, the size of the middle part of the driving member is reduced, which can reduce the fine machining area required for the sliding fit between the driving member and the inner wall of the valve body, facilitating the machining of the driving member, and at the same time, the position where the middle part of the driving member is located can also be kept in communication with the oil return port; the overflow groove includes a radial groove and an axial groove, which can ensure the communication between the cavities and at the same time ensure the force balance of the driving member;

[0023] 3. In the dual throttle valve control module of the present invention, the driving member is driven by a driving device through a gear set, with high precision and enabling accurate control of the opening degree. By specifically setting the structure of the gear set, the fine control of the displacement of the driving member can be achieved through the transmission of large and small gears, and each displacement of the driving member corresponds to a change in the opening degree of the throttle valve assembly, so the fine control of the opening degree of the throttle valve assembly can also be achieved; the second small gear can be driven manually or electrically. When driven manually, the handle can be fixedly connected to the second gear shaft, and the opening degree of the corresponding throttle valve assembly can be adjusted by manually operating the angle of the handle; when driven electrically, a high-response motor can be fixedly connected to the second gear shaft. Not only can the valve opening degree be calculated based on the rotation angle of the motor to perform closed-loop control on the lifting and lowering speeds of the hydraulic cylinder piston, but also specific opening times (such as PWM pulse width modulation) can be set for the two throttle valve assemblies within a short period, and combined with position, speed, and force sensors, the movement state of the hydraulic cylinder piston can be finely controlled;

[0024] 4. In the double throttle valve control module of the present invention, both ends of the valve core are slidably fitted with the valve sleeve and the plug respectively. The outer diameter of the end where the valve core is slidably fitted with the plug is equal to the diameter where the valve core abuts against the valve sleeve, which can ensure that the pressure of the second oil port of the plug acts on the valve core in the same magnitude in both axial directions, thereby avoiding the pressure of the second oil port of the plug pressing the valve core tightly against the valve sleeve. The outer diameter of the end where the valve core is slidably fitted with the valve sleeve is equal to the diameter where the valve core abuts against the valve sleeve, which can ensure that the pressure of the first oil port of the valve sleeve acts on the valve core in the same magnitude in both axial directions, thereby avoiding the pressure of the first oil port of the valve sleeve pushing the valve core away from the valve sleeve. That is, the above setting of the diameter relationship can ensure the balance of the force exerted by the oil port on the valve core of the throttle valve assembly without affecting the movement of the valve core.

[0025] 5. In the hydraulic system of the present invention, the oil inlet and return speeds of the hydraulic cylinder are controlled by the double throttle valve control module, thereby realizing the control of the lifting and lowering speeds of the hydraulic cylinder. Specifically, the connection relationship between the oil ports of the double throttle valve control module and the hydraulic cylinder is set. When the driving member pushes the valve core of the throttle valve assembly that controls the lifting of the hydraulic cylinder to slide open, the pressure oil enters from the oil inlet to the oil outlet, and then opens the one-way valve and enters the rodless cavity of the single-acting hydraulic cylinder, lifting the hydraulic cylinder piston at a certain speed. When the driving force is cancelled and the driving member returns to the middle position, the throttle valve assembly closes, the pressure oil is blocked, and the one-way valve is closed by the high-pressure oil in the rodless cavity of the hydraulic cylinder. The other set of throttle valve assemblies is also in the closed state. Therefore, the hydraulic cylinder piston can maintain its height for a long time and will not continuously descend under the action of gravity due to excessive leakage of the oil in the rodless cavity. When the driving member pushes the valve core of the throttle valve assembly that controls the lowering of the hydraulic cylinder to slide open, the oil in the rodless cavity of the hydraulic cylinder enters from the corresponding oil inlet to the oil outlet and returns to the fuel tank, and the hydraulic cylinder piston descends at a certain speed. Usually, the hydraulic lifting system does not require both the lifting and lowering valve ports to be fully open at the same time. Therefore, the compatibility of this control module with the hydraulic lifting system is very high. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic structural diagram of the double throttle valve control module;

[0027] Figure 2 is a sectional view of the double throttle valve control module;

[0028] Figure 3 is Figure 2 a partial enlarged view of;

[0029] Figure 4 is a schematic structural diagram of the cooperation between the driving member and the gear set;

[0030] Figure 5 is a schematic structural diagram of the driving member;

[0031] Figure 6It is the hydraulic schematic diagram of the hydraulic system;

[0032] In the figure: 1 - valve body; 11 - oil inlet; 12 - oil outlet; 13 - oil return port; 14 - installation cavity; 2 - throttle valve assembly; 21 - valve core; 211 - through hole; 212 - first end; 213 - second end; 214 - conical surface; 215 - annular protrusion; 22 - elastic member; 23 - valve sleeve; 231 - first oil port; 24 - plug; 241 - second oil port; 25 - first chamber; 26 - second chamber; 271 - first seal; 272 - second seal; 273 - third seal; 28 - gasket; 3 - driving member; 31 - flow - through groove; 311 - radial groove; 312 - axial groove; 32 - tooth; 33 - cutting surface; 34 - circumferential surface; 4 - gear set; 41 - first gear shaft; 42 - large gear; 43 - first small gear; 44 - second gear shaft; 45 - second small gear; 5 - hydraulic cylinder; 51 - piston; 52 - rod - end chamber; 53 - bottom - end chamber; 6 - check valve; 7 - oil tank. Detailed implementation manners

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way restrictive of the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0034] It should be noted that the terms used herein are only for describing the specific implementation manners and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0035] Unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods, and devices should be regarded as part of the specification. In all the examples shown and discussed here, any specific values should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, further discussion thereof in subsequent drawings is not required.

[0036] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by orientation terms such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal", and "top, bottom", etc. are generally based on the orientation or positional relationships shown in the drawings. These are only for the convenience of describing the present invention and simplifying the description. Without contrary description, these orientation terms do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of the present invention; the orientation terms "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0037] For ease of description, spatial relative terms such as "above...", "over...", "on the upper surface of...", "above" etc. may be used here to describe the spatial positional relationships of one device or feature shown in the drawings with other devices or features. It should be understood that the spatial relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the drawings. For example, if the device in the drawing is inverted, the device described as "above or over other devices or structures" will then be positioned "below or under other devices or structures". Thus, the exemplary term "above" can include both the orientations of "above" and "below". The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations should be made for the spatial relative descriptions used here.

[0038] In addition, it should be noted that the use of terms such as "first", "second", etc. to define components is only for the convenience of differentiating the corresponding components. Without otherwise stating, the above terms have no special meanings. Therefore, they should not be construed as limiting the scope of protection of the present invention.

[0039] Such as Figures 1-5As shown in the figure, this embodiment proposes a dual throttle valve control module, which includes a valve body 1, a throttle valve assembly 2, and a driving member 3. A plurality of oil ports are provided on the valve body 1. The throttle valve assembly 2 is divided into two groups, and the two groups of throttle valve assemblies 2 are symmetrically arranged inside the valve body 1. In the initial state, the valve core 21 of the throttle valve assembly 2 forms a butt under the action of the elastic member 22 to block the communication between the oil ports. The driving member 3 is located between the two groups of throttle valve assemblies 2, and there is a gap between the two ends of the driving member 3 and the two valve cores 21. The axial movement of the driving member 3 can push one side of the valve core 21 to open to control the opening degree, and the other side of the valve core 21 remains in the initial state.

[0040] As Figures 1-2 shown in the figure, an installation cavity 14 is formed inside the valve body 1 to facilitate the assembly of the throttle valve assembly 2 and the driving member 3. A plurality of oil ports are formed on the valve body 1, and each oil port is communicated with the installation cavity 14. Specifically, for each group of throttle valve assemblies 2, an oil inlet 11 and an oil outlet 12 are provided on the valve body 1. The valve core 21 of the throttle valve assembly 2 forms a butt under the action of the elastic member 22 to block the communication between the corresponding oil inlet 11 and oil outlet 12.

[0041] As a preferred technical solution of this embodiment, the installation cavity 14 penetrates through the valve body 1, and the middle space of the installation cavity 14 is enlarged to facilitate the assembly of the gear set 4.

[0042] As a preferred technical solution of this embodiment, the oil inlets 11 and oil outlets 12 corresponding to the two groups of throttle valve assemblies 2 are respectively located at both ends of the valve body 1 and are symmetrically arranged. The valve body 1 can be set as a symmetric structure.

[0043] As a preferred technical solution of this embodiment, an oil return port 13 is provided on the valve body 1, and the oil return port 13 is located in the middle of the valve body 1.

[0044] As a preferred technical solution of this embodiment, the positions of the oil inlet 11 and the oil outlet 12 corresponding to each group of throttle valve assemblies 2 can be interchanged. The oil inlet 11 can be arranged axially outside the oil outlet 12, or the oil inlet 11 can be arranged axially inside the oil outlet 12.

[0045] The throttle valve assembly 2 is divided into two groups and is symmetrically distributed inside the valve body 1. The two groups of throttle valve assemblies 2 respectively control the on-off and opening degree between the two groups of oil inlets 11 and oil outlets 12. Taking one group of throttle valve assemblies 2 as an example, as Figure 3 shown in the figure, the throttle valve assembly 2 includes a valve core 21, an elastic member 22, a valve sleeve 23, and a plug 24. The valve sleeve 23 is located inside the plug 24. The plug 24 is used to block the opening at the end of the installation cavity 14. One end of the valve core 21 is slidably matched with the valve sleeve 23, and the other end of the valve core 21 slides along the plug 24. A conical surface 214 is formed on the outer surface of the valve core 21. Under the action of the elastic member 22, the conical surface 214 abuts against the valve sleeve 23 to disconnect the communication between the oil inlet 11 and the oil outlet 12.

[0046] As a preferred technical solution of this embodiment, the valve sleeve 23 is located on the inner periphery of one of the oil inlets 11 and the oil outlets 12. The valve sleeve 23 is provided with a first oil port 231 to facilitate communication with one of the corresponding oil inlets 11 and the oil outlets 12. The plug 24 extends to the inner periphery of the other oil inlet of the oil inlets 11 and the oil outlets 12. The plug 24 is provided with a second oil port 241 to facilitate communication with the other oil inlet of the oil outlets 12 and the oil inlets 11. When the oil inlet 11 is axially outside the oil outlet 12, the valve sleeve 23 is located on the inner periphery of the oil outlet 12. The first oil port 231 on the valve sleeve 23 communicates with the oil outlet 12. The plug 24 extends to the inner periphery of the oil inlet 11. The second oil port 241 on the plug 24 communicates with the oil inlet 11. When the oil inlet 11 is axially inside the oil outlet 12, the valve sleeve 23 is located on the inner periphery of the oil inlet 11. The first oil port 231 on the valve sleeve 23 communicates with the oil inlet 11. The plug 24 extends to the inner periphery of the oil outlet 12. The second oil port 241 on the plug 24 communicates with the oil outlet 12. In this embodiment, it is set that the oil inlet 11 is axially outside the oil outlet 12, the valve sleeve 23 is located on the inner periphery of the oil outlet 12, and the first oil port 231 communicates with the oil outlet 12. The plug 24 extends to the inner periphery of the oil inlet 11, and the second oil port 241 communicates with the oil inlet 11.

[0047] As a preferred technical solution of this embodiment, a first annular cavity is formed between the circumferences of the valve core 21 and the valve sleeve 23. The first annular cavity communicates with the first oil port 231. A second annular cavity is formed between the circumferences of the plug 24 and the valve core 21. The second annular cavity communicates with the second oil port 241. The conical surface 214 of the valve core 21 abuts against the end of the valve sleeve 23 close to the plug 24, blocking the communication between the first annular cavity and the second annular cavity, and further blocking the communication between the oil inlet 11 and the oil outlet 12.

[0048] As a preferred technical solution of this embodiment, the valve core 21 is rod-shaped with a varying outer diameter. The valve core 21 has a cylindrical first end 212 and a second end 213. The first end 212 of the valve core 21 is in sliding fit with one end of the valve sleeve 23 away from the plug 24, and the second end 213 of the valve core 21 is in sliding fit with one end of the plug 24 away from the valve sleeve 23. A conical surface 214 is formed on the outer surface of the middle part of the valve core 21. Preferably, in order to prevent the pressure at the oil outlet 12 from pushing the valve core 21 away from the valve sleeve 23, the diameter D1 of the first end 212 of the valve core 21 is set to be equal to the diameter D3 at the abutting position of the conical surface 214. In this way, the acting areas of the oil fluid entering the first annular cavity in the two axial directions are the same, and the acting forces are the same, thereby preventing the pressure at the oil outlet 12 from pushing the valve core 21 away from the valve sleeve 23. In order to prevent the pressure at the oil inlet 11 from pressing the valve core 21 against the valve sleeve 23, the diameter D2 of the second end 213 of the valve core 21 is set to be equal to the diameter D3 at the abutting position of the conical surface 214. In this way, the acting areas of the oil fluid entering the second annular cavity in the two axial directions are the same, and the acting forces are the same, thereby preventing the pressure at the oil inlet 11 from pressing the valve core 21 against the valve sleeve 23.

[0049] As a preferred technical solution of this embodiment, a first cavity 25 is formed between the first end 212 of the valve core 21 and the driving member 3, and a second cavity 26 is formed between the second end 213 of the valve core 21 and the plug 24. In order to ensure the pressure balance between the two cavities, a through hole 211 is provided on the valve core 21 to communicate the first cavity 25 and the second cavity 26. Preferably, the through hole 211 is an axially extending through hole.

[0050] As a preferred technical solution of this embodiment, one end of the elastic member 22 abuts against the plug 24, and the other end acts on the valve core 21. Preferably, the elastic member 22 can be sleeved on the valve core 21. A first seal 271 is provided between the plug 24 and the valve core 21 and is limited by a gasket 28. An annular protrusion 215 is formed on the outer peripheral surface of the valve core 21. One end of the elastic member 22 abuts against the gasket 28, and the other end of the elastic member 22 abuts against the annular protrusion 215. In the initial state, the elastic member 22 is in a pre-compressed state. The elastic member 22 can be, but is not limited to, a spring.

[0051] As a preferred technical solution of this embodiment, in order to ensure the overall sealing performance, a second seal 272 is provided between the valve sleeve 23 and the inner wall of the valve body 1. The second seal 272 is located between the oil inlet 11 and the oil outlet 12; a third seal 273 is provided between the plug 24 and the inner wall of the valve body 1.

[0052] As Figures 1-2As shown, the driving member 3 is used to push the valve cores 21 of the throttle valve assemblies 2 on both sides to control the opening degree. The driving member 3 is located between the two throttle valve assemblies 2 and is coaxially arranged with the two throttle valve assemblies 2. Both ends of the driving member 3 are slidably engaged with the valve body 1, and the middle part of the driving member 3 is driven to perform axial reciprocating motion.

[0053] As a preferred technical solution of this embodiment, as Figure 5 shown, the driving member 3 has a rod-shaped structure, and both ends of the driving member 3 have a circumferential surface 34, which is convenient for sliding engagement with the inner wall of the installation cavity 14.

[0054] As a preferred technical solution of this embodiment, as Figure 5 shown, the middle part of the driving member 3 has a reduced size, and the outer diameter of the middle part of the driving member 3 is smaller than that of both ends. In this way, a cavity is formed on the outer periphery of the middle part of the driving member 3, which is convenient for maintaining communication with the oil return port 13.

[0055] As a preferred technical solution of this embodiment, as Figure 5 shown, teeth 32 are also formed in the middle part of the driving member 3, which is convenient for being driven to move by means of gear transmission.

[0056] As a preferred technical solution of this embodiment, as Figure 5 shown, a cut surface 33 is also formed in the middle part of the driving member 3. Correspondingly, a flat protrusion can be provided on the inner wall of the valve body 1, and the flat protrusion is in clearance fit with the cut surface 33. Once the driving member 3 has an angular deflection, the flat protrusion can abut against the cut surface 33 to prevent it from rotating. In addition, a stepped surface is formed between the cut surface 33 and the outer peripheral surface of the middle part of the driving member 3, and the flat protrusion can also cooperate with the stepped surface to limit the movement range of the driving member 3.

[0057] As a preferred technical solution of this embodiment, as Figure 5 shown, flow-through grooves 31 are formed at both ends of the driving member 3, which is convenient for the first chamber 25 to communicate with the oil return port 13 through the flow-through grooves 31. The flow-through grooves 31 extend from the end face of the driving member 3 to the middle part. Specifically, the flow-through grooves 31 include radial grooves 311 and axial grooves 312. The radial grooves 311 penetrate the end face of the driving member 3 along the radial direction of the driving member 3, and two axial grooves 312 can be provided, which are respectively communicated with both ends of the radial grooves 311 and extend parallel to the axis direction. By providing the radial grooves 311 on the end face, it can be ensured that when the driving member 3 abuts against the valve core 21, the oil in the first chamber 25 can still communicate with the oil return port 13 through the flow-through grooves 31.

[0058] As a preferred technical solution of this embodiment, as Figure 5 shown, the driving member 3 has a symmetrical structure.

[0059] As Figure 4As shown in the figure, the driving member 3 makes an axial reciprocating motion driven by the driving device, and the driving device can drive the driving member 3 through the gear set 4. Specifically, the gear set 4 includes a first gear shaft 41 and a second gear shaft 44. A large gear 42 and a first small gear 43 are coaxially arranged on the first gear shaft 41, and a second small gear 45 is arranged on the second gear shaft 44. The first small gear 43 meshes with the teeth 32 on the driving member 3, and the second small gear 45 meshes with the large gear 42. By externally driving the second gear shaft 44 and the second small gear 45 thereon, the driving member 3 can be driven to make an axial reciprocating motion. By adopting the transmission mode of small gear - large gear - small gear, the fine control of the motion of the driving member 3 can be realized.

[0060] As a preferred technical solution of this embodiment, the second gear shaft 44 can be manually driven. The driving device can be set as a handle, and the handle is connected to the second gear shaft 44. By controlling the angle of the handle, the second gear shaft 44 can be driven to rotate, and then transmitted to the driving member 3. In addition, the second gear shaft 44 can also be electrically driven. The driving device is set as a high - response motor. The high - response motor can be connected to the second gear shaft 44. The axial movement position of the driving member 3 can be closed - loop controlled by the angle of the motor rotation. Also, through PWM pulse width modulation and combined with sensor detection, the fine control of the position of the driving member 3 can be realized.

[0061] As a preferred technical solution of this embodiment, in addition to adopting the gear transmission mode, the driving mode of screw - nut, the cooperation of cam and connecting rod, etc. can also be adopted to realize the control of the axial movement of the driving member 3.

[0062] As Figure 6 shown in the figure, this embodiment also provides a hydraulic system, which includes the aforementioned double throttle valve control module, and also includes a hydraulic cylinder 5. The hydraulic cylinder 5 is communicated with the double throttle valve control module, and the double throttle valve control module controls the lifting and lowering speeds of the hydraulic cylinder 5.

[0063] The hydraulic cylinder 5 includes a piston 51 located in the cylinder body. The piston 51 divides the inside of the cylinder body into a rod - end chamber 52 and a rodless chamber 53. When the rodless chamber 53 is filled with oil, the piston 51 can be pushed to rise; when the rodless chamber 53 returns oil, the piston 51 descends.

[0064] The hydraulic cylinder 5 is communicated with the oil ports on the double throttle valve control module. One set of throttle valve assemblies 2 of the double throttle valve control module controls the lifting of the hydraulic cylinder 5, and the other set of throttle valve assemblies 2 controls the lowering of the hydraulic cylinder 5.

[0065] Specifically, for the purpose of distinction and explanation, the two throttle valve assemblies 2 of the double throttle valve control module are respectively the first throttle valve assembly 2 and the second throttle valve assembly 2. It can be set that the oil inlet 11 corresponding to the first throttle valve assembly 2 introduces pressure oil, and the corresponding oil outlet 12 is communicated with the rodless cavity 53 of the hydraulic cylinder 5. The first throttle valve assembly 2 controls the oil inlet speed of the rodless cavity 53 of the hydraulic cylinder 5, and further controls the movement speed of the piston 51 moving upward; the oil inlet 11 corresponding to the second throttle valve assembly 2 is communicated with the rodless cavity 53 of the hydraulic cylinder 5, and the corresponding oil outlet 12 is communicated with the oil tank 7. The second throttle valve assembly 2 controls the oil return speed of the rodless cavity 53 of the hydraulic cylinder 5, and further controls the movement speed of the piston 51 moving downward.

[0066] As a preferred technical solution of this embodiment, a check valve 6 is provided between the oil outlet 12 of the first throttle valve assembly 2 and the rodless cavity 53 to control the one-way flow of pressure oil to the rodless cavity 53 without reverse flow.

[0067] As a preferred technical solution of this embodiment, the rod cavity 52 is communicated with the oil tank 7. When the piston 51 moves upward, the oil in the rod cavity 52 is discharged into the oil tank 7; when the piston 51 moves downward, the oil tank 7 can supply oil to the rod cavity 52.

[0068] As a preferred technical solution of this embodiment, the oil return port 13 is communicated with the oil tank 7, so that the first chamber 25, the second chamber 26 of the throttle valve assembly 2, and the flow-through groove 31 of the driving member 3 are all in a low-pressure state.

[0069] Based on the above technical solutions, the working principle of the hydraulic system of this embodiment is as follows:

[0070] As Figure 6 shown, when the driving member 3 moves to the right to a certain position, the valve port of the first throttle valve assembly 2 is opened, the pressure oil at the oil inlet 11 enters, and then the check valve 6 is opened to enter the rodless cavity 53 of the hydraulic cylinder 5, and the piston 51 of the hydraulic cylinder 5 is lifted at a certain speed; when the driving force is cancelled and the driving member 3 returns to the middle position, the valve port of the first throttle valve assembly 2 is closed, the pressure oil at the oil inlet 11 is blocked, and the check valve 6 is closed by the high-pressure oil in the rodless cavity 53 of the hydraulic cylinder 5; while the second throttle valve assembly 2 remains in the disconnected state, so the piston 51 of the hydraulic cylinder 5 can maintain its height for a long time and will not continuously drop under the action of gravity due to excessive oil leakage in the rodless cavity 53.

[0071] When the driving member 3 moves to the left to a certain position, the valve port of the second throttle valve assembly 2 is opened, the oil in the rodless cavity 53 of the hydraulic cylinder 5 enters from the oil inlet 11 and then returns to the oil tank 7 through the oil outlet 12, and the piston 51 of the hydraulic cylinder 5 descends at a certain speed. Usually, the hydraulic lifting system does not require both the lifting and lowering valve ports to be fully open at the same time, so the compatibility of this control module with the hydraulic lifting system is very high.

[0072] Each displacement of the driving member 3 corresponds to a certain opening of two sets of throttle valve assemblies 2. Therefore, the lifting and lowering speeds of the piston 51 of the hydraulic cylinder 5 are continuously controllable respectively. Generally speaking, the transmission mechanism of the control module can be driven manually or by a motor. If the handle is fixedly connected to the second gear shaft 44, the lifting and lowering speeds of the piston 51 of the hydraulic cylinder 5 can be proportionally controlled by the angle of the handle; if a high-response motor is fixedly connected to the second gear shaft 44, not only can the valve opening be calculated by the rotation angle of the motor, so as to carry out closed-loop control on the lifting and lowering speeds of the piston 51 of the hydraulic cylinder 5, but also specific opening times (such as PWM pulse width modulation) can be set for the two throttle valve assemblies 2 within a short period, and combined with position, speed, and force sensors, the movement state of the piston 51 can be precisely controlled.

[0073] 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, and various changes can be made without departing from the purpose of the present invention within the scope of knowledge possessed by those of ordinary skill in the art.

Claims

1. A dual throttle valve control module, characterized in that, Comprising: A valve body (1) provided with a plurality of oil ports thereon; Two throttle valve assemblies (2), symmetrically arranged within the valve body (1). Each throttle valve assembly (2) includes a valve core (21), and the valve core (21) forms an abutment under the action of an elastic member (22) to block the communication between the oil ports; A driving member (3) located between the two throttle valve assemblies (2). There are gaps between the two ends of the driving member (3) and the two valve cores (21) respectively, and the driving member (3) pushes a single-side valve core (21) to open to control the opening degree; A through hole (211) communicating the two ends is formed within the valve core (21), and an oil flow-through groove (31) is formed on the driving member (3). The cavity between the valve core (21) and the driving member (3) communicates with the oil return port (13) through the oil flow-through groove (31).

2. The double throttle valve control module according to claim 1, characterized in that, The middle part of the driving member (3) has a reduced size and is in communication with the oil return port (13). The oil flow-through grooves (31) are formed at both ends of the driving member (3), and the oil flow-through grooves (31) extend from the end face of the driving member (3) to the middle part of the driving member (3).

3. The double throttle valve control module according to claim 2, wherein The oil flow-through groove (31) includes a radial groove (311) located at the end face of the driving member (3) and an axial groove (312) located on the outer peripheral surface of the driving member (3).

4. A dual throttle valve control module according to any one of claims 1-3, characterized in that, The driving member (3) makes an axial reciprocating motion driven by a driving device. Teeth (32) are formed in the middle part of the driving member (3), and the driving device drives the driving member (3) through a gear set (4).

5. The dual throttle valve control module according to claim 4, characterized in that, The gear set (4) includes a first gear shaft (41) and a second gear shaft (44). A large gear (42) and a first small gear (43) are coaxially arranged on the first gear shaft (41), a second small gear (45) is arranged on the second gear shaft (44), the first small gear (43) meshes with the driving member (3), the large gear (42) meshes with the second small gear (45), and the second small gear (45) is externally driven.

6. The dual throttle valve control module according to claim 1, wherein, Each throttle valve assembly (2) further includes a valve sleeve (23) and a plug (24). The valve sleeve (23) and the plug (24) are arranged within the valve body (1). One end of the valve core (21) close to the driving member (3) is in sliding fit with the valve sleeve (23), the other end of the valve core (21) slides along the plug (24), and a tapered surface (214) is formed on the outer surface of the valve core (21) and abuts against the valve sleeve (23).

7. A dual throttle valve control module according to claim 1 or 6, characterized in that, The outer diameters at both ends of the valve core (21) and the diameters corresponding to the positions where the valve core (21) abuts are equal.

8. A hydraulic system, characterized in that, Comprising: A hydraulic cylinder (5); The double throttle valve control module according to any one of claims 1 - 7, wherein one throttle valve assembly (2) controls the lifting of the hydraulic cylinder (5), and the other throttle valve assembly (2) controls the lowering of the hydraulic cylinder (5).

9. A hydraulic system according to claim 8, characterized in that, An oil inlet (11) and an oil outlet (12) are provided on the valve body (1) for each set of throttle valve assemblies (2). Pressure oil is introduced through one oil inlet (11), and the corresponding oil outlet (12) is unidirectionally communicated with the rodless cavity (53) of the hydraulic cylinder (5); the other oil inlet (11) is communicated with the rodless cavity (53) of the hydraulic cylinder (5), and the corresponding oil outlet (12) is communicated with the oil tank (7).

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