Hydraulic spool valve

Abstract

The application discloses a hydraulic slide valve, which comprises a valve shell and a valve core, the valve shell is provided with a closing oil port, a pressure oil port and a cylinder oil port, the valve core is slidably arranged in the center cavity of the valve shell, the pressure oil port and the cylinder oil port are communicated when the valve core is in the first working position, and the pressure oil port and the cylinder oil port are disconnected when the valve core is in the second working position; an assisting part comprises a contact plate and a transmission column, the contact plate is in transmission connection with the cylinder, and the transmission column extends into the center cavity and seals the closing oil port; a controller supplies oil when receiving a trigger signal, when the cylinder drives the oil motor to run to a preset position, the transmission column moves to unseal the closing oil port, and the closing oil port supplies oil to drive the valve core to move to the second working position. In the movement process of the cylinder, the closing oil port is opened through the assisting part, so that the closing oil port is opened when the oil motor reaches the preset position, the valve core is rapidly moved to the second working position, and then the oil motor is stopped at the preset position, thereby avoiding the influence of sudden change of unit load on the service life of equipment.

Description

Technical Field

[0001] This invention relates to the field of valve equipment technology, and in particular to a hydraulic slide valve. Background Technology

[0002] Hydraulic systems are commonly used in various industrial applications such as machine tools and construction machinery. Spool valves are crucial components in hydraulic systems for equipment control and regulation. Spool valves utilize a valve core that slides on a sealing surface, thereby altering the inlet and outlet positions of the fluid through the valve core's structural design to control fluid flow. This, in turn, regulates the state of the hydraulic actuator, enabling the hydraulic system to control the equipment. Currently, some high-power power plant units are driven to start and stop via hydraulic actuators. These actuators require rapid action upon receiving an external shutdown signal, changing the state of the hydraulic cylinder by adjusting the position of the valve core in the spool valve, thus regulating the driving state of the hydraulic actuator. However, current spool valves can only regulate the start and stop states of the hydraulic actuator. This can lead to significant load fluctuations during unit startup or shutdown, and the rapid rate of change in unit state can put considerable pressure on the equipment, reducing its lifespan.

[0003] Therefore, how to optimize the regulating effect of the slide valve on the hydraulic actuator and reduce the risk of sudden load changes in the unit is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a hydraulic spool valve to optimize the spool valve's regulation effect on the hydraulic actuator and reduce the risk of sudden load changes in the unit.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A hydraulic spool valve, comprising:

[0007] The valve housing and valve core are provided. The valve housing has a shut-off port, a pressure port and a cylinder port. The valve core is slidably disposed in the central cavity of the valve housing. When the valve core is in the first working position, the pressure port and the cylinder port are connected. When the valve core is in the second working position, the pressure port and the cylinder port are disconnected.

[0008] The auxiliary part includes a contact plate and a transmission column that are fixedly connected. The contact plate is connected to the hydraulic cylinder for transmission. The transmission column extends into the central cavity and the transmission column closes the closing port on the side wall of the central cavity.

[0009] The controller, upon receiving a trigger signal, opens the oil supply to the closed oil port and the pressure oil port, the oil cylinder receives oil and moves, and when the oil cylinder drives the hydraulic motor to a preset position, the contact plate is driven by the oil cylinder and drives the transmission column to move to unseal the closed oil port, and the oil supply to the closed oil port drives the valve core to move to the second working position.

[0010] Preferably, in the above-mentioned hydraulic spool valve, the transmission column abuts against the valve core, the valve core is located in the first working position when there is no external force, and when the contact plate is driven by the oil cylinder, it drives the transmission column to move and pushes the valve core to the second working position.

[0011] Preferably, in the above-mentioned hydraulic spool valve, the outer wall of the valve core is provided with a first sealing part, a second sealing part and a third sealing part at intervals in the axial direction. When the valve core is in the first working position, the pressure oil port and the oil cylinder port are located between the second sealing part and the third sealing part. When the valve core is in the second working position, the second sealing part closes the passage between the pressure oil port and the oil cylinder port.

[0012] Preferably, in the above-mentioned hydraulic spool valve, when the valve core is in the second working position, the pressure port and the shut-off port are disconnected through the first sealing part.

[0013] Preferably, in the above-mentioned hydraulic slide valve, the first sealing part, the second sealing part and the third sealing part are rubber labyrinth seals.

[0014] Preferably, in the above-mentioned hydraulic spool valve, the contact plate is located outside the valve housing, and a return spring is sandwiched between the contact plate and the valve housing. When the oil cylinder drives the contact plate to move toward the valve housing, the return spring is in a compressed state.

[0015] Preferably, in the above-mentioned hydraulic spool valve, the closing dimension of the transmission column to the closing port is larger than the opening cross-section of the closing port.

[0016] Preferably, in the above-mentioned hydraulic spool valve, the oil supply for the shut-off port and the pressure port is the same oil supply device.

[0017] Preferably, in the above-mentioned hydraulic spool valve, the valve core is provided with a throttling orifice in the axial direction, the throttling orifice connects both sides of the valve core, and a return oil port is opened on one side of the valve body.

[0018] Preferably, in the above-mentioned hydraulic spool valve, the trigger signal is a mechanical signal or an electrical signal.

[0019] As can be seen from the above technical solution, the hydraulic spool valve provided by the present invention includes a valve core, a valve housing, an actuating part, and a controller. The valve housing has a closing port, a pressure port, and a cylinder port. The closing port and the pressure port are connected to an oil supply device, allowing closing oil and pressure oil to enter the valve housing. The cylinder port is connected to a cylinder, so that when hydraulic oil is present in the cylinder port, it pushes the cylinder rod to move. The valve core is slidably disposed in the central cavity of the valve housing. It should be noted that the valve core has at least two positions: a first working position and a second working position. Specifically, when the valve core is in the first working position, the pressure port and the cylinder port are connected. When the pressure port supplies oil, it drives the cylinder rod to move. When the valve core is in the second working position, the pressure port and the cylinder port are disconnected, the cylinder rod stops moving, and the valve core is in the initial state, i.e., in the first working position without external force. The auxiliary part is used to adjust the working position of the valve core. Specifically, the auxiliary part includes a fixedly connected contact plate and a transmission column. The connecting plate is connected to the cylinder transmission through the cylinder port, i.e., the cylinder movement is transmitted to the contact plate position through a mechanical structure. At the same time, the transmission column extends into the central cavity of the valve body, and the closing port on the valve body is closed by the side wall of the transmission column. When the oil supply equipment supplies oil to the closing port... After oil supply, due to the sealing effect of the transmission column, oil still cannot enter the valve body from the closed port. The controller is used to receive trigger signals and make adjustments. It should be noted that the trigger signal here is the external unit's state switching signal from open to closed. When the controller receives the trigger signal, it opens the oil supply to the closed port and the pressure port. At this time, since the pressure port and the cylinder port are connected, the cylinder receives oil and drives the hydraulic actuator to perform the unit's shutdown action. When the cylinder drives the hydraulic actuator to the preset position, the contact plate is driven by the cylinder and drives the transmission column to move. The transmission column releases the closed port, and the oil supply to the closed port resumes. This will drive the valve core to move to the second working position. When the valve core is in the second working position, the pressure oil port and the oil cylinder port are disconnected, causing the oil cylinder to stop driving the hydraulic motor. At this time, the unit will operate under the current load. It should be noted that the preset position is set by the operator according to the working conditions. When the hydraulic motor is in the preset position, the unit load is between the operating load and the shutdown load, which can realize the graded adjustment of the unit load and thus protect the unit equipment. When the hydraulic motor is in the preset position, the contact plate drives the contact plate, which can be achieved by adjusting the oil cylinder resistance value or sending a position electrical signal to be adjusted by the controller.The hydraulic spool valve provided by this invention has a valve core slidably disposed within the central cavity of the valve housing. By incorporating an auxiliary actuator and a controller, the spool valve achieves graded regulation of the hydraulic actuator and unit load. Specifically, when the controller receives an external trigger signal—a signal indicating a switch from the on to the off state of the external unit—it opens the oil supply to the closing port (i.e., the pressure port). The closing port is sealed by the transmission column, preventing oil from entering the valve housing. The oil supply from the pressure port then connects to the cylinder port to actuate the cylinder. When the hydraulic actuator moves to a preset position, the cylinder drives the contact plate. The movement of the transmission column unlocks the oil port, and the oil supply drive valve core of the oil port quickly switches from the first working position to the second working position, cutting off the pressure oil port and the oil cylinder port. This causes the hydraulic motor to stop at the preset position, corresponding to the external unit operating at a load between the maximum load and the shutdown load. This load value can be adjusted according to the triggering conditions of the contact plate. After the external unit equipment is running stably at the corresponding load, the unit is shut down. This makes the unit shutdown process staged, thereby reducing the damage to the equipment caused by sudden changes in unit load. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the hydraulic slide valve structure when the valve core is in the first working position, as provided in an embodiment of the present invention.

[0022] Figure 2 A schematic diagram of the hydraulic slide valve structure when the valve core is in the second working position, provided in an embodiment of the present invention;

[0023] Wherein, 10-valve housing; 110-closing oil port; 120-pressure oil port; 130-cylinder oil port; 140-return oil port; 20-valve core; 210-first sealing part; 220-second sealing part; 230-third sealing part; 240-throttle orifice; 310-contact plate; 320-transmission column; 330-reset spring. Detailed Implementation

[0024] The core of this invention is to disclose a hydraulic spool valve to optimize the spool valve's regulation effect on the hydraulic actuator and reduce the risk of sudden load changes in the unit.

[0025] To enable those skilled in the art to better understand the present invention, embodiments of the present invention will be described below with reference to the accompanying drawings. Furthermore, the embodiments shown below do not limit the scope of the invention as described in the claims. Additionally, the complete contents of the configurations shown in the embodiments below are not limited to those necessary for the solution of the invention described in the claims.

[0026] like Figure 1 and Figure 2 As shown, the hydraulic spool valve provided in this embodiment of the invention includes a valve core 20, a valve housing 10, an actuating part, and a controller. The valve housing 10 has a closing port 110, a pressure port 120, and a cylinder port 130. The closing port 110 and the pressure port 120 are connected to an oil supply device, allowing closing oil and pressure oil to enter the valve housing 10. The cylinder port 130 is connected to a cylinder, so that when hydraulic oil is present in the cylinder port 130, it pushes the cylinder rod to move. The valve core 20 is slidably disposed on the valve housing 10. Within the central cavity, it should be noted that the valve core 20 has at least two positions: a first working position and a second working position. Specifically, when the valve core 20 is in the first working position, the pressure oil port 120 and the cylinder oil port 130 are connected. When the pressure oil port 120 supplies oil, it will drive the cylinder rod to move. When the valve core 20 is in the second working position, the pressure oil port 120 and the cylinder oil port 130 are disconnected, the cylinder rod stops moving, and the valve core 20 is in the initial state, that is, in the first working position without the action of external force.

[0027] The auxiliary part is used to adjust the working position of the valve core 20. Specifically, the auxiliary part includes a contact plate 310 and a transmission column 320 that are fixedly connected. The contact plate is connected to the cylinder transmission through the cylinder port 130. That is, the cylinder action is transmitted to the position of the contact plate 310 through the mechanical structure. At the same time, the transmission column 320 extends into the central cavity of the valve body 10. The closing port 110 on the valve body 10 is closed by the side wall of the transmission column 320. After the oil supply equipment supplies oil to the closing port 110, due to the sealing effect of the transmission column 320, the oil supply still cannot enter the valve body 10 from the closing port 110.

[0028] The controller is used to receive trigger signals and make adjustments. It should be noted that the trigger signal here is the external unit's state switching signal from on to off. When the controller receives the trigger signal, it opens the oil supply to the closing port 110 and the pressure port 120. At this time, since the pressure port 120 and the cylinder port 130 are connected, the cylinder receives oil and drives the hydraulic motor to perform the unit's shutdown action. When the cylinder drives the hydraulic motor to the preset position, the contact plate 310 is driven by the cylinder and drives the transmission column 320 to move. The transmission column 320 unblocks the closing port 110, and the oil supply to the closing port 110 will drive the valve core 20 to the second working position. When the valve core 20 is in the second working position, the pressure port 120 and the cylinder port 130 are disconnected, causing the cylinder to stop driving the hydraulic motor. At this time, the unit will operate in the current load state.

[0029] It should be noted that the preset position is set by the staff according to the working conditions. When the hydraulic motor is in the preset position, the unit load is between the operating load and the shutdown load, which can realize the graded adjustment of the unit load and thus protect the unit equipment. When the hydraulic motor is in the preset position, the contact plate 310 can be driven by adjusting the hydraulic cylinder resistance value or sending a position electrical signal to be adjusted by the controller.

[0030] The hydraulic spool valve provided in this embodiment of the invention has a valve core 20 slidably disposed in the central cavity of the valve housing 10. An auxiliary actuator and a controller are provided to achieve graded regulation of the hydraulic motor and unit load by the spool valve. Specifically, when the controller receives an external trigger signal, i.e., a signal indicating that the external unit is switching from open to closed, it opens the oil supply to the closing port 110 (i.e., the pressure port 120). The closing port 110 is closed by the transmission column 320, preventing oil from entering the valve housing 10. The oil supply from the pressure port 120 is then connected to the cylinder port 130 to actuate the cylinder. When the hydraulic motor moves to a preset position, the cylinder contacts the contact plate 3. 10 drives the transmission column 320 to move and unseal the oil port 110. The oil supply drive valve core 20 of the oil port 110 quickly switches from the first working position to the second working position, cutting off the pressure oil port 120 and the cylinder oil port 130, so that the hydraulic motor stops at the preset position, corresponding to the external unit operating at a load between the maximum load and the shutdown load. This load value can be adjusted according to the triggering conditions of the contact plate 310. After the external unit equipment is running stably at the corresponding load, the unit is shut down, so that the unit shutdown process is staged, thereby reducing the damage to the equipment caused by sudden changes in unit load.

[0031] To further optimize the above technical solution, in the hydraulic spool valve provided in this embodiment of the invention, the transmission column 320 abuts against the valve core 20 to assist in pushing the valve core 20 when it moves. Specifically, the valve core 20 is located in the first working position without external force, and when the contact plate 310 is driven by the oil cylinder, it drives the transmission column 320 to move to unseal the closed oil port 110, so that the oil supply of the closed oil port 110 pushes the valve core 20. At the same time, the transmission column 320 abuts against the valve core 20, and when the contact plate 310 moves, the transmission column 320 pushes the valve core 20 to move to the second working position, thereby increasing the position change rate of the valve core 20.

[0032] Furthermore, in a specific embodiment of the present invention, the outer wall of the valve core 20 is provided with a first sealing part 210, a second sealing part 220, and a third sealing part 230 in the axial direction, which are sealed and cooperate with the inner wall of the valve housing 10. Specifically, when the valve core 20 is in the first working position, the pressure oil port 120 and the cylinder oil port 130 are located between the second sealing part 220 and the third sealing part 230 to achieve communication, while the closed oil port 110 and the pressure oil port 120 are isolated through the first sealing part 210 and the second sealing part 220. When the valve core 20 is in the second working position, the second sealing part 220 moves between the pressure oil port 120 and the cylinder oil port 130 to disconnect the pressure oil port 120 and the cylinder oil port 130, while the closed oil port 110 and the pressure oil port 120 are isolated through the first sealing part 210, so that the oil supply of each oil port can function independently.

[0033] Based on the above embodiments, the first sealing part 210, the second sealing part 220 and the third sealing part 230 are preferably rubber labyrinth seals, so as to achieve a stable sealing effect by adopting a multi-hole structure.

[0034] To further optimize the above technical solution, in the hydraulic spool valve provided in the embodiment of the present invention, the contact plate 310 is disposed outside the valve housing 10 and spaced apart from one end of the valve housing 10. At the same time, a return spring 330 is sandwiched between the contact plate 310 and the valve housing 10. When the oil cylinder drives the contact plate 310 to move toward the valve housing 10, the return spring 330 is in a compressed state so that when the oil cylinder stops driving the contact plate 310, the contact plate 310 is restored to its initial position by the action of the return spring 330 and is ready for subsequent use.

[0035] Furthermore, in a preferred embodiment of the present invention, the closed port 110 is in an over-sealed state when it is closed by the transmission column 320, that is, the closing size of the transmission column 320 on the closed port 110 is larger than the opening cross-sectional size of the closed port 110. When the auxiliary part does not operate, although oil is supplied to the closed port 110, the closed port 110 cannot break the seal on its own. Only when the auxiliary part operates can the closed port 110 be unsealed, and the valve core 20 is driven through the closed port 110.

[0036] Furthermore, in order to reduce the difficulty of adjustment, in a specific embodiment of the present invention, the oil supply for the closed oil port 110 and the pressure oil port 120 is the same oil supply device, that is, the opening and closing of the closed oil port 110 after oil supply is achieved by an auxiliary part.

[0037] Furthermore, in a specific embodiment of the present invention, the valve core 20 is provided with a throttling orifice 240 in the axial direction. The throttling orifice 240 connects both sides of the valve core 20, and a return oil port 140 is opened on one side of the valve housing 10. During the reset process of the valve core 20, the throttling orifice 240 connects both sides of the valve core 20 so that the pressure oil flows slowly from the throttling orifice 240 and slows down the movement speed of the valve core 20, so as to avoid the valve core 20 moving too fast and causing fluctuation interference to the control and adjustment process when the slide valve is reset.

[0038] Furthermore, in a specific embodiment of the present invention, the external trigger signal received by the controller is a mechanical signal or an electrical signal.

[0039] The terms "first," "second," "left side," and "right side," etc., used in the specification, claims, and accompanying drawings of this invention are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units may include steps or units not listed, but rather steps or units not listed.

[0040] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A hydraulic spool valve, characterized in that, include: The valve housing (10) and valve core (20) are provided. The valve housing (10) is provided with a closing oil port (110), a pressure oil port (120) and a cylinder oil port (130). The valve core (20) is slidably disposed in the central cavity of the valve housing (10). When the valve core (20) is in the first working position, the pressure oil port (120) and the cylinder oil port (130) are connected. When the valve core (20) is in the second working position, the pressure oil port (120) and the cylinder oil port (130) are disconnected. The auxiliary part includes a contact plate (310) and a transmission column (320) that are fixedly connected. The contact plate (310) is connected to the hydraulic cylinder. The transmission column (320) extends into the central cavity and the transmission column (320) closes the closing port (110) on the side wall of the central cavity. When the controller receives a trigger signal, it opens the oil supply to the shut-off port (110) and the pressure port (120), the oil cylinder gets oil and moves, and when the oil cylinder drives the hydraulic motor to a preset position, the contact plate (310) is driven by the oil cylinder and drives the transmission column (320) to move to unseal the shut-off port (110), and the oil supply to the shut-off port (110) drives the valve core (20) to move to the second working position.

2. The hydraulic spool valve as described in claim 1, characterized in that, The transmission column (320) abuts against the valve core (20). The valve core (20) is located in the first working position when there is no external force. When the contact plate (310) is driven by the oil cylinder, it drives the transmission column (320) to move and pushes the valve core (20) to the second working position.

3. The hydraulic spool valve as described in claim 1, characterized in that, The outer wall of the valve core (20) is provided with a first sealing part (210), a second sealing part (220) and a third sealing part (230) spaced apart in the axial direction. When the valve core (20) is in the first working position, the pressure oil port (120) and the cylinder oil port (130) are located between the second sealing part (220) and the third sealing part (230). When the valve core (20) is in the second working position, the second sealing part (220) closes the passage between the pressure oil port (120) and the cylinder oil port (130).

4. The hydraulic spool valve as described in claim 3, characterized in that, When the valve core (20) is in the second working position, the pressure port (120) and the shut-off port (110) are disconnected through the first sealing part (210).

5. The hydraulic spool valve as described in claim 3, characterized in that, The first sealing part (210), the second sealing part (220) and the third sealing part (230) are rubber labyrinth seals.

6. The hydraulic spool valve as described in claim 1, characterized in that, The contact plate (310) is located outside the valve housing (10), and a return spring (330) is sandwiched between the contact plate (310) and the valve housing (10). When the oil cylinder drives the contact plate (310) to move toward the valve housing (10), the return spring (330) is in a compressed state.

7. The hydraulic spool valve as described in claim 1, characterized in that, The closing dimension of the transmission column (320) to the closed oil port (110) is larger than the opening cross-section of the closed oil port (110).

8. The hydraulic spool valve as described in claim 1, characterized in that, The oil supply for the closed oil port (110) and the pressure oil port (120) is the same oil supply device.

9. The hydraulic spool valve as described in claim 1, characterized in that, The valve core (20) is provided with a throttling hole (240) in the axial direction. The throttling hole (240) connects the two sides of the valve core (20), and an oil return port (140) is opened on one side of the valve body (10).

10. The hydraulic spool valve as described in claim 1, characterized in that, The trigger signal is a mechanical signal or an electrical signal.

Images