A pilot control system

Abstract

The present invention relates to the field of hydraulic technology, and in particular to a pilot control system, which includes a pilot control valve group, the pilot control valve group includes a valve stem, a valve body assembly and a centering assembly; the valve stem is slidably arranged in the accommodating cavity of the valve body assembly, and one end thereof extends relative to one end of the valve body assembly, and the valve stem can be connected to a control member of a working valve; the valve body assembly is provided with a first oil port and a second oil port connected to the accommodating cavity; the centering assembly is arranged at the other end of the valve body assembly and connected to the valve stem, and when the first oil port and the second oil port are both not supplied with oil, the centering assembly can make the valve stem be located in a middle position; a pilot handle, the first control port of the pilot handle is connected to the first oil port, and the second control port of the pilot handle is connected to the second oil port. The present invention can improve the operating performance without changing the main body of the system.

Description

Technical Field

[0001] The invention relates to the field of hydraulic technology, and in particular to a pilot control system. Background Art

[0002] The working device of construction machinery is generally controlled by a working valve, and the travel system is controlled by a speed change valve. Currently, most of the mainstream working valves and speed change valves are controlled by mechanical linkages. The mechanical linkage control structure is complex, difficult to adjust, has a large overall operating force, and poor comfort.

[0003] The hydraulic pilot handle control working system has the characteristics of small operating force and simple connection. It is commonly used in high-end models. The hydraulic pilot control cancels the relevant mechanical linkage mechanism and uses hydraulic hose for control. The connection is simple and the layout is convenient, but the overall application cost is relatively high.

[0004] Since the main parts such as mechanical working valves / speed-changing valves have a mature application foundation for many years, the supporting cost is low. If the current new hydraulic pilot system is directly used to improve the operating comfort, the original working valves, speed-changing valves and other main parts need to be replaced, and the main system needs to be changed greatly. For the upgrade of old models, the cost is high and the operability is not great.

[0005] Therefore, a pilot control system is needed to solve the above technical problems. Summary of the invention

[0006] The object of the present invention is to provide a pilot control system which can improve the control performance without changing the main body of the system.

[0007] To achieve this object, the present invention adopts the following technical solutions:

[0008] A pilot control system, comprising:

[0009] A pilot control valve group, the pilot control valve group comprising a valve stem, a valve body assembly and a centering assembly;

[0010] The valve stem is slidably disposed in the accommodating cavity of the valve body assembly, and one end of the valve stem extends relative to one end of the valve body assembly, and the valve stem can be connected to the control member of the working valve;

[0011] The valve body assembly is provided with a first oil port and a second oil port communicating with the accommodating cavity;

[0012] The centering component is arranged at the other end of the valve body component and connected to the valve stem. When the first oil port and the second oil port are both without oil inflow, the centering component can make the valve stem be located in the middle position;

[0013] A pilot handle, wherein the first control port of the pilot handle is communicated with the first oil port, the second control port of the pilot handle is communicated with the second oil port, and the pilot handle can control the movement direction and movement speed of the valve stem.

[0014] Furthermore, a sliding ring portion is convexly provided on the valve stem, and when the valve stem is in a neutral position, the sliding ring portion is located between the first oil port and the second oil port.

[0015] Furthermore, an annular groove is formed on the sliding ring portion, and a first sealing ring is arranged in the annular groove.

[0016] Furthermore, a connecting rod is provided at one end of the valve stem extending relative to the valve body assembly, and the connecting rod can be connected to a control member of the working valve.

[0017] Further, the valve body assembly includes a valve body, the valve body is provided with the first oil port and the second oil port, one end of the valve body is provided with a first end cover, the other end of the valve body is provided with a second end cover, one end of the valve stem extends relative to the first end cover, the other end of the valve stem extends relative to the second end cover, and is connected to the centering assembly.

[0018] Further, a first position-limiting member is provided on a side of the first end cover facing the valve body, the first position-limiting member is located in the accommodating cavity, and the first position-limiting member is used to limit the displacement of the valve stem.

[0019] Further, a second position-limiting member is provided on a side of the second end cover facing the valve body, the second position-limiting member is located in the accommodating cavity, and the second position-limiting member is used to limit the displacement of the valve stem.

[0020] Furthermore, the centering component comprises:

[0021] A fixing plate, the fixing plate is U-shaped and is fixedly disposed on the valve body assembly;

[0022] a first spring seat and a second spring seat, wherein the first spring seat is sleeved on the valve stem and can abut against the valve body assembly, the second spring seat and the first spring seat are spaced apart along the movement direction of the valve stem, an elastic member is arranged between the first spring seat and the second spring seat, one end of the elastic member abuts against the first spring seat, and the other end of the elastic member abuts against the second spring seat;

[0023] A connecting piece is provided at one end of the valve stem away from the working valve. The connecting piece can abut against a side of the second spring seat away from the first spring seat. The valve stem can drive the first spring seat and the second spring seat to move.

[0024] Furthermore, a gasket is provided between the connecting member and the second spring seat.

[0025] Furthermore, the pilot handle is provided with an electric control valve group, and the electric control valve group has the first control port and the second control port.

[0026] Beneficial effects of the present invention:

[0027] A pilot control system provided by the present invention includes a pilot valve group and a pilot handle. The valve stem of the pilot valve group is arranged in the valve body assembly, and one end extends relative to the valve body assembly and is connected to the control part of the working valve. A first oil port and a second oil port are provided on the valve body assembly. The first control port of the pilot handle is connected to the first oil port, and the second control port of the pilot handle is connected to the second oil port. By controlling the pilot handle, the hydraulic oil can be controlled to enter from the first oil port or from the second oil port, so as to achieve the purpose of controlling the movement direction of the valve stem. The pressure of the output hydraulic oil can be controlled by the operating amplitude of the pilot handle, so as to achieve the purpose of adjusting the movement speed of the valve stem. Since the valve stem is connected to the control part of the working valve, the working valve can be controlled by the pilot handle. Through the above-mentioned arrangement, the control performance of the engineering machinery can be improved without changing the main body of the system, and the old model can be upgraded at a relatively low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a schematic diagram of a pilot control system in Embodiment 1 of the present invention;

[0029] Figure 2 It is a cross-sectional view of a pilot control valve group in a pilot control system in Embodiment 1 of the present invention;

[0030] Figure 3 It is a schematic diagram of a pilot control system in Embodiment 2 of the present invention.

[0031] In the figure:

[0032] 1. Valve body assembly; 11. Valve body; 12. First end cover; 13. Second sealing ring; 14. Second end cover; 15. Third sealing ring; 16. Dust ring; 17. First oil port; 18. Second oil port; 2. Centering assembly; 21. Fixed plate; 22. First spring seat; 23. Second spring seat; 24. Elastic member; 25. Sleeve; 26. Connecting member; 27. Gasket; 3. Valve stem; 31. Guide slip ring; 32. First sealing ring; 33. Connecting rod; 4. Pilot handle; 41. Electric control valve group. DETAILED DESCRIPTION

[0033] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and implementation methods. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention are shown in the accompanying drawings, rather than all of them.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0036] Embodiment 1

[0037] In order to improve the maneuverability of construction machinery without changing the main system, such as Figure 1-Figure 2 As shown, the present invention provides a pilot control system. The pilot control system comprises: a pilot control valve group and a pilot handle 4.

[0038] Among them, the pilot control valve group includes a valve stem 3, a valve body assembly 1 and a centering assembly 2; the valve stem 3 is slidably arranged in the accommodating cavity of the valve body assembly 1, and one end extends out relative to one end of the valve body assembly 1, and the valve stem 3 can be connected to the control part of the working valve; the valve body assembly 1 is provided with a first oil port 17 and a second oil port 18 connected to the accommodating cavity; the centering assembly 2 is arranged at the other end of the valve body assembly 1 and is connected to the valve stem 3. When no oil is flowing into the first oil port 17 and the second oil port 18, the centering assembly 2 can make the valve stem 3 be located in the middle position; the first control port of the pilot handle 4 is connected to the first oil port 17, and the second control port of the pilot handle 4 is connected to the second oil port 18. The pilot handle 4 can control the movement direction and movement speed of the valve stem 3.

[0039] By controlling the pilot handle 4, the hydraulic oil can be controlled to enter from the first oil port 17 or from the second oil port 18, so as to control the movement direction of the valve stem 3. The pressure of the output hydraulic oil can be controlled by the operating amplitude of the pilot handle 4, so as to adjust the output pressure and movement position of the valve stem 3. Since the valve stem 3 is connected to the control part of the working valve, the working valve can be controlled by the pilot handle 4. Through the above settings, the control performance of the engineering machinery can be improved without changing the main body of the system, and the old model can be upgraded at a relatively low cost.

[0040] Furthermore, a sliding ring is convexly provided on the valve stem 3. When the valve stem 3 is in the middle position, the sliding ring is located between the first oil port 17 and the second oil port 18. Specifically, the sliding ring and the valve stem 3 are an integrated structure. The accommodating cavity is divided into a first rod cavity and a second rod cavity by the sliding ring. The first oil port 17 is connected to the first rod cavity, and the second oil port 18 is connected to the second rod cavity. When oil enters the first rod cavity, oil returns to the second rod cavity, and the valve stem 3 moves in the first direction. When oil enters the second rod cavity, oil returns to the first rod cavity, and the valve stem 3 moves in the first direction opposite to the first direction. Therefore, the operation of the working valve can be controlled by controlling the oil inlet and oil pressure.

[0041] Furthermore, an annular groove is formed on the sliding ring portion, and a first sealing ring 32 is disposed in the annular groove. The first sealing ring 32 is located between the valve body assembly 1 and the valve stem 3. The first sealing ring 32 can block the gap between the first rod cavity and the second rod cavity, thereby preventing oil from flowing between the first rod cavity and the second rod cavity.

[0042] In order to improve the smoothness of the movement of the valve stem 3 in the accommodating cavity, in this embodiment, a guide slip ring 31 is provided on the slip ring portion.

[0043] Furthermore, a connecting rod 33 is provided at one end of the valve stem 3 extending relative to the valve body assembly 1, and the connecting rod 33 can be connected to the control part of the working valve. By providing the connecting rod 33, the connecting rod 33 plays a transitional role in connecting the valve stem 3 and the control part, and it is convenient to design the connecting rod 33 according to the shape and position of the control part of the working valve, so as to facilitate installation and use on engineering machinery.

[0044] Furthermore, the valve body assembly 1 includes a valve body 11, a first oil port 17 and a second oil port 18 are provided on the valve body 11, a first end cover 12 is fixedly provided at one end of the valve body 11, a second end cover 14 is fixedly provided at the other end of the valve body 11, one end of the valve stem 3 extends relative to the first end cover 12, the other end of the valve stem 3 extends relative to the second end cover 14, and is connected to the centering assembly 2. By providing the first end cover 12 and the second end cover 14, the end of the valve body 11 can be blocked, thereby preventing dust and impurities from entering the accommodating cavity. In order to prevent the hydraulic oil from leaking through the gap between the first end cover 12, the second end cover 14 and the valve body 11, a second sealing ring 13 is provided between the first end cover 12 and the valve body 11, a third sealing ring 15 is provided between the second end cover 14 and the valve body 11, and a dust ring 16 is provided between the second end cover 14 and the valve body 11.

[0045] Further, a first stopper is provided on the fixed rod of the first end cover 12 on the side facing the valve body 11, the first stopper is located in the accommodating cavity, and the first stopper is used to limit the displacement of the valve stem 3, thereby playing a role of mechanical hard stopper. Further, a second stopper is fixedly provided on the side facing the valve body 11 of the second end cover 14, the second stopper is located in the accommodating cavity, and the second stopper is used to limit the displacement of the valve stem 3, thereby playing a role of mechanical hard stopper.

[0046] Furthermore, the centering assembly 2 includes: a fixing plate 21 , a first spring seat 22 and a second spring seat 23 .

[0047] The fixing plate 21 is U-shaped and fixedly arranged on the second end cover 14 of the valve body assembly 1; the first spring seat 22 is sleeved on the valve stem 3 and can abut against the second end cover 14; the second spring seat 23 and the first spring seat 22 are spaced apart along the movement direction of the valve stem 3; an elastic member 24 is arranged between the first spring seat 22 and the second spring seat 23; one end of the elastic member 24 abuts against the first spring seat 22, and the other end of the elastic member 24 abuts against the second spring seat 23; a connecting member 26 is arranged at one end of the valve stem 3 away from the working valve, and the connecting member 26 can abut against the side of the second spring seat 23 away from the first spring seat 22, and the valve stem 3 can drive the first spring seat 22 and the second spring seat 23 to move. By setting the centering assembly 2, the valve stem 3 can be in the middle position when there is no oil inflow.

[0048] In this embodiment, when oil enters the second oil port 18 and oil exits the first oil port 17, the valve stem 3 moves to the left, and the valve stem 3 drives the first spring seat 22 to squeeze the elastic member 24, and the second spring seat 23 abuts against the fixed plate 21; when oil enters the first oil port 17 and oil exits the second oil port 18, the valve stem 3 moves to the right, and the connecting member 26 drives the second spring seat 23 to squeeze the elastic member 24, and the first spring seat 22 abuts against the second end cover 14; after oil stops entering the first oil port 17 and the second oil port 18, the valve stem 3 is reset to the middle position under the action of the elastic member 24.

[0049] Furthermore, a gasket 27 is provided between the connecting member 26 and the second spring seat 23. Specifically, the gasket 27 is sleeved on the connecting member 26. By providing the gasket 27, the distance between the second spring seat 23 and the first spring seat 22 can be adjusted, thereby playing a role in adjusting the elastic force of the elastic member 24. In this embodiment, the elastic member 24 is a compression spring. In order to determine the initial position of the connecting member 26 and ensure that the connecting member 26 is reliably installed, a sleeve 25 is sleeved on the connecting member 26.

[0050] In this embodiment, the pilot handle 4 is a hydraulic pilot handle. The hydraulic pilot handle is a common operating handle for engineering machinery. This type of handle usually has an oil inlet, an oil return port, and two or four output control oil ports. After the pilot handle 4 is operated in a certain direction, each corresponding output control oil port below the pilot handle 4 outputs a certain pressure. The greater the operating range, the greater the output pressure, and the pressure is related to the operating stroke. In this embodiment, the pilot handle 4 drives the main valve core of the working valve to move through the pilot control valve group, thereby realizing the action of the working device.

[0051] Embodiment 2

[0052] The biggest difference between this embodiment and the first embodiment is that the type of the pilot handle 4 is different. The following is a detailed description:

[0053] like Figure 3 As shown, the pilot handle 4 is provided with an electric control valve group 41, and the electric control valve group 41 has a first control port and a second control port. In this embodiment, the pilot handle 4 is an electric control pilot handle. The electric control pilot handle is a common operating handle for engineering machinery, and can usually move in two or four directions. After the electric control pilot handle moves, it can output different electrical signals according to the size of the operating stroke position. The electrical signal is transmitted to the controller, and the controller outputs a specific current / voltage at a specific port according to the program requirements according to the set program. The output current / voltage is usually used to control the electric control valve group 41 to achieve different actions of the working device.

[0054] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A pilot control system, characterized in that: include: A pilot control valve assembly, the pilot control valve assembly comprising a valve stem (3), a valve body assembly (1) and a centering assembly (2); The valve stem (3) is slidably disposed in the accommodating cavity of the valve body assembly (1), and one end of the valve stem extends relative to one end of the valve body assembly (1); the valve stem (3) can be connected to a control member of the working valve; The valve body assembly (1) is provided with a first oil port (17) and a second oil port (18) which are communicated with the accommodating cavity; The centering component (2) is arranged at the other end of the valve body component (1) and is connected to the valve stem (3). When oil is not flowing into the first oil port (17) and the second oil port (18), the centering component (2) can make the valve stem (3) be located in a middle position. The valve body assembly (1) comprises a valve body (11), one end of the valve body (11) is provided with a first end cover (12), and the other end of the valve body (11) is provided with a second end cover (14); a pilot handle (4), wherein a first control port of the pilot handle (4) is in communication with the first oil port (17), and a second control port of the pilot handle (4) is in communication with the second oil port (18), and the pilot handle (4) is capable of controlling the movement direction and movement speed of the valve stem (3); The centering assembly (2) comprises: A fixing plate (21), the fixing plate (21) being U-shaped and fixedly disposed on the valve body assembly (1); a first spring seat (22) and a second spring seat (23), wherein the first spring seat (22) is sleeved on the valve stem (3) and is capable of abutting against the valve body assembly (1), the second spring seat (23) and the first spring seat (22) are spaced apart along the movement direction of the valve stem (3), an elastic member (24) is provided between the first spring seat (22) and the second spring seat (23), one end of the elastic member (24) abuts against the first spring seat (22), and the other end of the elastic member (24) abuts against the second spring seat (23); A connecting piece (26) is provided at one end of the valve stem (3) away from the working valve, and the connecting piece (26) can abut against a side of the second spring seat (23) away from the first spring seat (22), and the valve stem (3) can drive the first spring seat (22) and the second spring seat (23) to move; When oil flows into the second oil port (18) and oil flows out of the first oil port (17), the valve stem (3) moves leftward, and the valve stem (3) drives the first spring seat (22) to squeeze the elastic member (24), and at this time the second spring seat (23) contacts the fixed plate (21); when oil flows into the first oil port (17) and oil flows out of the second oil port (18), the valve stem (3) moves rightward, and the connecting member (26) drives the second spring seat (23) to squeeze the elastic member (24), and at this time the first spring seat (22) contacts the second end cover (14); after oil does not flow into the first oil port (17) and the second oil port (18), the valve stem (3) returns to a neutral position under the action of the elastic member (24).

2. A pilot control system according to claim 1, characterized in that: A sliding ring portion is convexly provided on the valve stem (3); when the valve stem (3) is in a neutral position, the sliding ring portion is located between the first oil port (17) and the second oil port (18).

3. A pilot control system according to claim 2, characterized in that: An annular groove is provided on the sliding ring portion, and a first sealing ring (32) is arranged in the annular groove.

4. A pilot control system according to claim 1, characterized in that: A connecting rod (33) is provided at one end of the valve stem (3) that extends relative to the valve body assembly (1), and the connecting rod (33) can be connected to a control component of the working valve.

5. A pilot control system according to claim 1, characterized in that: The valve body (11) is provided with the first oil port (17) and the second oil port (18); one end of the valve stem (3) extends relative to the first end cover (12); the other end of the valve stem (3) extends relative to the second end cover (14) and is connected to the centering component (2).

6. A pilot control system according to claim 5, characterized in that: A first position-limiting member is provided on a side of the first end cover (12) facing the valve body (11), the first position-limiting member is located in the accommodating cavity, and the first position-limiting member is used to limit the displacement of the valve stem (3).

7. A pilot control system according to claim 5, characterized in that: A second position-limiting member is provided on a side of the second end cover (14) facing the valve body (11), the second position-limiting member is located in the accommodating cavity, and the second position-limiting member is used to limit the displacement of the valve stem (3).

8. A pilot control system according to claim 1, characterized in that: A gasket (27) is provided between the connecting member (26) and the second spring seat (23).

9. A pilot control system according to claim 1, characterized in that: The pilot handle (4) is provided with an electric control valve group (41), and the electric control valve group (41) has the first control port and the second control port.

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