Hydraulic reversing valve with differential control function
By designing a hydraulic directional valve with differential control function, differential control of the hydraulic cylinder is realized. Only one valve core and valve body are required, which reduces manufacturing costs and simplifies the control structure. It is suitable for standard integrated circuit boards.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-02-28
- Publication Date
- 2026-04-03
AI Technical Summary
In existing hydraulic systems, differential control of hydraulic cylinders requires at least two hydraulic directional valves, resulting in high costs and complex integration, making it difficult to implement on standard integrated circuit boards.
Design a hydraulic directional valve with differential control function. Through the cooperation of a valve core and valve body, four working positions are realized, including standby position, first, second, third and fourth working positions, which respectively realize the connection, closure and isolation of the oil chambers, simplifying the control circuit.
Differential control of hydraulic cylinders can be achieved with only one directional valve, which reduces manufacturing costs, simplifies the control structure, and is suitable for standard integrated circuit boards.
Smart Images
Figure CN121782391A_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the field of hydraulic control, and specifically relates to a hydraulic directional valve. Background Technology
[0002] Currently, the technical solution used in hydraulic systems to control the reversing of hydraulic cylinders and achieve differential control requires at least two hydraulic directional valves, and the integrated circuit board used needs to be customized. This is not only costly but also complex to implement. Furthermore, if multiple hydraulic cylinders require differential control, not only does the integrated circuit board need to be customized, but it is also difficult to integrate it into a single circuit board. If there were a directional valve that could achieve differential control of hydraulic cylinders with only one valve, it would greatly simplify the existing hydraulic cylinder differential control structure. It could be implemented using a standard integrated circuit board, and would have significant advantages in terms of the cost of using hydraulic valves and the manufacturing cost of valve blocks, thus reducing the overall manufacturing cost of hydraulic cylinder differential control. Summary of the Invention
[0003] The problem to be solved by this application is to develop a hydraulic directional valve that can realize differential control of hydraulic cylinders with only one valve, thereby upgrading and simplifying the existing differential control scheme for hydraulic cylinders.
[0004] The technical problem of this application is solved by the following technical solution: A hydraulic directional valve with differential control function includes a valve body (11) and a valve core (12). The valve body (11) is provided with a hole that slides with the valve core (12). The valve body (11) is provided with oil chambers (P), (T), (A), and (B). The contact surface between the valve core (12) and the valve body (11) has a sealing function for communication or isolation between the oil chambers. The valve core (12) moves along the axial direction of the hole in the valve body (11) to form three working positions: the first working position is that the oil chambers (P) and (A) are connected. The first working position is characterized by the following: oil chamber (B) and oil chamber (T) are connected; the second working position is characterized by the following: oil chamber (P) is connected to oil chamber (A) and oil chamber (B), while oil chamber (T) is in a closed state and is not connected to any oil chamber; the third working position is characterized by the following: oil chamber (P) is connected to oil chamber (B), and oil chamber (A) is connected to oil chamber (T); the positional relationship of the three working positions is as follows: the second working position is between the first working position and the third working position, characterized in that a fourth working position is also provided between the second working position and the first working position or the third working position; the fourth working position is the standby position of the hydraulic directional valve, which remains in this working position when there is no switching request.
[0005] The hydraulic directional valve with differential control function described above is characterized in that the first function of the fourth working position is that the oil chambers (P), (T), (A), and (B) are all in a closed state and are not connected to each other.
[0006] The hydraulic directional valve with differential control function described above is characterized in that the second function of the fourth working position is that the oil chambers (P), (T), (A), and (B) are interconnected.
[0007] The hydraulic directional valve with differential control function described above is characterized in that the third function of the fourth working position is that the oil chambers (P), (T), and (B) are interconnected, while the oil chamber (A) is in a closed state and is not connected to other oil chambers.
[0008] Compared with the prior art, the beneficial effects of this application are: the differential control function of the hydraulic cylinder is realized with only one directional valve, which is much more efficient than the prior art which requires at least two directional valves for combined control, thus saving one directional valve, reducing the manufacturing cost of the matching integrated valve plate, simplifying the control circuit, and optimizing the overall manufacturing cost. Attached Figure Description
[0009] Figure 1 This is the first hydraulic function symbol diagram of this application. Figure 2 This is a symbol diagram for the second type of hydraulic function in this application. Figure 3 Symbol diagram for the third hydraulic function of this application Figure 4 This is a schematic diagram of the first type of hydraulic function in the standby position according to this application. Figure 5 This is a schematic diagram of the structure of the first hydraulic function in the first working position according to this application. Figure 6 This is a schematic diagram of the structure of the first hydraulic function in the second working position of this application. Figure 7 This is a schematic diagram of the structure of the first hydraulic function in the third working position of this application. Figure 8 This is a schematic diagram of the second type of hydraulic function in the standby position according to this application. Figure 9 This is a schematic diagram of the structure of the second hydraulic function in the first working position of this application. Figure 10 This is a schematic diagram of the structure of the second hydraulic function in the second working position of this application. Figure 11 This is a schematic diagram of the structure of the second hydraulic function in the third working position of this application. Figure 12 This is a schematic diagram of the third hydraulic function in the standby position according to this application. Figure 13 This is a schematic diagram of the third hydraulic function of this application in the first working position. Figure 14This is a schematic diagram of the third hydraulic function of this application in the second working position. Figure 15 This is a schematic diagram of the third hydraulic function in the third working position of this application. Figure 16 This is a schematic diagram of the structure in the first embodiment of the present application. Figure 17 Hydraulic schematic diagram of the first embodiment of this application Figure 18 Hydraulic schematic diagram of the second embodiment of this application Figure 19 Hydraulic schematic diagram of the third embodiment of this application Detailed Implementation
[0010] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, not all of them. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this application. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this application.
[0011] In the description of this application, it should be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and are not intended to indicate or imply that the equipment 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 of this application.
[0012] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0013] In this application, unless otherwise expressly specified and limited, "above or below" a first feature may include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on" a first feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" a first feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature. Example
[0014] This embodiment includes a hydraulic directional valve (1) with differential control function and a hydraulic cylinder (6). The rodless chamber and the rod chamber of the hydraulic cylinder (6) are respectively connected to the oil chamber (A) and the oil chamber (B) of the hydraulic directional valve (1) with differential control function.
[0015] A hydraulic directional valve (1) with differential control function includes a valve body (11), a valve core (12) that slides with it, a plug (4), and an electric actuator (5). The electric actuator (5) is equipped with a stepper motor. The rotor shaft (52) of the stepper motor is connected to one end of the push rod (51) through a screw pair. The other end of the push rod (51) is connected to the valve core (12). The push rod (51) has a sliding constraint and cannot rotate. It can only convert the rotation of the rotor shaft (52) of the stepper motor into left and right movement along the axis. The start, stop, rotation direction, and rotation angle of the stepper motor in the electric actuator device (5) are used to push the valve core (12) to move within the valve body (11). These parameters are converted into the left or right movement and stop position of the push rod (51) through the rotor shaft (52), thus forming four working positions of the hydraulic directional valve (1) with differential control function: the first working position, the second working position, the standby position, and the third working position. When the hydraulic directional valve (1) with differential control function is in the standby position, the oil chamber (P) The oil chambers (T), (A), and (B) are isolated from each other. When the hydraulic directional valve (1) with differential control function is in the first working position, the oil chambers (P) and (A) are connected, and the oil chambers (B) and (T) are connected. When the hydraulic directional valve (1) with differential control function is in the second working position, the oil chambers (P), (A), and (B) are connected to each other, while the oil chamber (T) is in a closed state and is not connected to any oil chamber. When the hydraulic directional valve (1) with differential control function is in the third working position, the oil chambers (P) and (B) are connected, and the oil chambers (A) and (T) are connected.
[0016] When the hydraulic cylinder (6) is not in motion, the hydraulic directional valve (1) with differential control function is in standby position, and the oil chambers (P), (T), (A), and (B) are isolated from each other. The hydraulic cylinder (6) is locked and cannot be moved even under external force.
[0017] When the hydraulic cylinder (6) needs to extend quickly, the hydraulic directional valve (1) with differential control function switches to the second working position. The hydraulic oil is introduced from the oil chamber (P) through the oil chamber (A) into the rodless chamber of the hydraulic cylinder (6). At the same time, the hydraulic oil in the rod chamber of the hydraulic cylinder (6) is discharged and passes through the oil chamber (B) of the hydraulic directional valve (1) with differential control function and then enters the oil chamber (A) after passing through the oil chamber (P), forming differential control. Since the hydraulic oil in the rod chamber and the hydraulic oil in the oil chamber (P) enter the rodless chamber of the hydraulic cylinder (6) at the same time, the hydraulic cylinder (6) can extend quickly.
[0018] When the hydraulic cylinder (6) needs to extend under high pressure, the hydraulic directional valve (1) with differential control function switches to the first working position. The hydraulic oil is introduced from the oil chamber (P) through the oil chamber (A) into the rodless chamber of the hydraulic cylinder (6). At the same time, the hydraulic oil in the rod chamber of the hydraulic cylinder (6) passes through the oil chamber (B) of the hydraulic directional valve (1) with differential control function to the oil chamber (T) and then returns to the oil tank.
[0019] When the hydraulic cylinder (6) needs to retract, the hydraulic directional valve (1) with differential control function switches to the third working position. The hydraulic oil enters the rod chamber of the hydraulic cylinder (6) from the oil chamber (P) through the oil chamber (B). At the same time, the hydraulic oil in the rodless chamber of the hydraulic cylinder (6) is discharged and returns to the oil chamber (T) through the oil chamber (B) of the hydraulic directional valve (1) with differential control function. The hydraulic cylinder performs the retraction action. Example
[0020] This embodiment includes a hydraulic directional valve (2) with differential control function and a hydraulic cylinder (6). The rodless chamber and the rod chamber of the hydraulic cylinder (6) are respectively connected to the oil chamber (A) and the oil chamber (B) of the hydraulic directional valve (2) with differential control function.
[0021] The hydraulic directional valve (2) with differential control function has the same overall structure as the hydraulic directional valve (1) with differential control function in the first embodiment. The difference is that the structure and size of the valve core (12) are adjusted so that when it is in the standby position, the oil chamber (P), oil chamber (T), oil chamber (A) and oil chamber (B) are in a state of mutual communication. The other technical features will not be described again.
[0022] When the hydraulic cylinder (6) is not in motion, the hydraulic directional valve (2) with differential control function is in standby position. The oil chambers (P), (T), (A), and (B) are interconnected. The hydraulic cylinder (6) is in a suspended state and can move under the action of external force. At the same time, it can unload the hydraulic oil from the oil port (P) and let it flow back to the oil tank without generating pressure.
[0023] The operating principle of the hydraulic cylinder (6) for rapid extension, high-pressure extension, and retraction is the same as that of the first embodiment, and will not be described again here. Example
[0024] This embodiment includes a hydraulic directional valve (3) with differential control function and a hydraulic cylinder (6). The rodless chamber and the rod chamber of the hydraulic cylinder (6) are respectively connected to the oil chamber (A) and the oil chamber (B) of the hydraulic directional valve (3) with differential control function.
[0025] The hydraulic directional valve (3) with differential control function has the same overall structure as the hydraulic directional valve (1) with differential control function in the first embodiment. The difference is that the structure and size of the valve core (12) are adjusted so that when it is in the standby position, the oil chamber (P), oil chamber (T) and oil chamber (B) are interconnected, and the oil chamber (A) is in a closed state. The other technical features will not be described again.
[0026] When the hydraulic cylinder (6) is not in motion, the hydraulic directional valve (3) with differential control function is in standby position, the oil chamber (P), oil chamber (T) and oil chamber (B) are interconnected, the oil chamber (A) is in a closed state, the hydraulic cylinder (6) is in a semi-suspended state, it can extend but cannot retract under the action of external force, and at the same time it can unload the hydraulic oil from the oil port (P) so that it flows back to the oil tank without generating pressure.
[0027] The operating principle of the hydraulic cylinder (6) for rapid extension, high-pressure extension, and retraction is the same as that of the first embodiment, and will not be described again here.
[0028] This application is not limited to the above-described embodiments. If any modifications or variations to this application do not depart from the spirit and scope of this application, and if such modifications and variations fall within the scope of the claims and equivalent technologies of this application, then this application also includes such modifications and variations.
Claims
1. A hydraulic directional valve with differential control function, comprising a valve body (11) and a valve core (12), wherein the valve body (11) is provided with a hole that slides with the valve core (12), and the valve body (11) is provided with oil chambers (P), (T), (A), and (B), the contact surface between the valve core (12) and the valve body (11) has a sealing function for communication or isolation between the oil chambers, and the valve core (12) moves along the axial direction of the hole in the valve body (11) to form three working chambers. Operating positions: The first operating position is in which oil cavity (P) and oil cavity (A) are connected, and oil cavity (B) and oil cavity (T) are connected; the second operating position is in which oil cavity (P) is connected to oil cavity (A) and oil cavity (B), while oil cavity (T) is in a closed state and not connected to any oil cavity; the third operating position is in which oil cavity (P) and oil cavity (B) are connected, and oil cavity (A) and oil cavity (T) are connected; the positional relationship of the three operating positions is as follows: the second operating position is between the first and third operating positions, characterized in that... A fourth working position is provided between the second working position and the first or third working position; the fourth working position is the standby position of the hydraulic directional valve, which remains in this working position when there is no switching request.
2. A hydraulic directional valve with differential control function as described in claim 1, characterized in that, The first function of the fourth working position is that the oil chambers (P), (T), (A), and (B) are all in a closed state and are not connected to each other.
3. A hydraulic directional valve with differential control function as described in claim 1, characterized in that, The second function of the fourth working position is that the oil chambers (P), (T), (A), and (B) are interconnected.
4. A hydraulic directional valve with differential control function as described in claim 1, characterized in that, The third function of the fourth working position is that the oil chambers (P), (T), and (B) are interconnected, while the oil chamber (A) is closed and not connected to other oil chambers.