A directional valve spool drive device

Abstract

This utility model relates to the field of directional valve technology, specifically a directional valve spool driving device. It includes a housing with a mounting cavity open on one side. A motor is fixedly mounted on the bottom of the housing. A second rotating shaft is rotatably mounted within the mounting cavity, and a drive plate is fixedly mounted on the second rotating shaft. A push rod for pushing the valve spool is hinged to the drive plate at a position offset from the second rotating shaft. The drive plate and the output shaft of the motor are connected via a transmission mechanism. With this structure, the motor drives the drive plate to rotate, thereby controlling the push rod to push the valve spool axially. Compared to using a solenoid valve as a driving device, the driving device in this utility model does not require pilot oil flow during operation, resulting in a faster response speed for the valve spool. Furthermore, motor-driven operation effectively reduces the occurrence of valve jamming, making this device more adaptable to the complex operating conditions of tractors.

Description

Technical Field

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

[0002] A directional control valve is the "traffic commander" in a fluid power system. By precisely changing the connection between its internal flow channels, it switches the direction of fluid flow, thereby controlling the direction of action of the actuators and the state of the system (start, stop, unload, float). In a directional control valve, changing the connection between the flow channels is often achieved by the axial movement of the valve core. The valve body of the directional control valve has a valve hole, in which a valve core that can be driven to move axially is slidably installed. By moving the valve core axially, the position of the valve core is switched, thereby realizing the opening and closing of the oil inlet, oil return port and working port.

[0003] In existing technologies, the valve core driving device is mostly a solenoid valve, such as the solenoid valve disclosed in Chinese invention patent CN109707690B, "An Electro-proportional Load Sensitive Multi-way Valve with Integrated Hydraulic Lock." Solenoid valves, as valve core driving devices, have advantages such as high control precision and convenient operation. However, solenoid valves require pilot oil flow when driving the valve core, resulting in a relatively slow response speed. Furthermore, using solenoid valves as valve core driving devices carries the risk of valve jamming, making them unsuitable for the complex operating conditions of tractors. Utility Model Content

[0004] To address the aforementioned problems, this utility model provides a directional valve spool drive device to solve the issues of slow response speed and risk of valve jamming in existing electromagnetic valve-driven spools, making them unsuitable for complex tractor operating conditions.

[0005] This utility model is achieved using the following technical solution: a reversing valve core driving device, including a housing, a mounting cavity with an opening on one side on the housing, a motor fixedly mounted on the bottom of the housing, a second rotating shaft rotatably mounted inside the mounting cavity, a driving plate fixedly mounted on the second rotating shaft, a push rod for pushing the valve core is hinged to the driving plate at a position offset from the second rotating shaft, and the driving plate and the output shaft of the motor are driven and cooperated through a transmission mechanism.

[0006] With the above structure, the drive plate is rotated by a motor, which in turn controls the push rod to push the valve core to move axially. Compared with the solenoid valve as the drive device, the drive device in this utility model does not require the flow of pilot oil during drive, and the response speed of the drive valve core is faster. In addition, the motor drive can effectively reduce the occurrence of valve jamming, making this device more adaptable to the complex working conditions of tractors.

[0007] Preferably, the transmission mechanism includes a first gear rotatably mounted in the mounting cavity, the first gear being coaxially and fixedly connected to the motor output shaft. A first rotating shaft is rotatably mounted in the mounting cavity, and a second gear and a third gear are coaxially and fixedly connected to the first rotating shaft, with the first gear meshing with the second gear. The drive plate includes a toothed portion that meshes with the third gear, and the center of the toothed portion is located on the axis of the second rotating shaft. Gear transmission improves the device's precision, simplifies its structure, facilitates installation, and enables subsequent maintenance and repair.

[0008] Preferably, the drive plate further includes a circular rotating part, which is coaxially and fixedly connected to the second rotating shaft. The rotating part and the gear teeth combine to form an incomplete gear. This incomplete gear configuration, formed by the rotating parts, makes machining the gear teeth more convenient. Furthermore, only the gear teeth need to be set as needed, saving space and making the device more compact and stable during use.

[0009] Preferably, the edge of the rotating part protrudes outward to form a first hinge portion, which is hinged to the end of the push rod away from the opening of the mounting cavity. By setting the first hinge portion that protrudes outward, the requirement for the diameter of the rotating part is reduced, further saving the installation space of the drive plate.

[0010] Preferably, the first hinge portion, rotating portion, and gear tooth portion are integrally formed. This integral forming design makes the drive plate structure more stable, requires less processing, facilitates mass production, and offers good economic benefits.

[0011] Preferably, the pitch circle diameters of the incomplete gear, second gear, third gear, and first gear formed by the rotating part and the gear teeth decrease sequentially. By setting the transmission ratio, the thrust output by the push rod can be increased, thereby making it easier for the device to push the valve core and further reducing the occurrence of valve jamming.

[0012] Preferably, the push rod includes a hinged arm hinged to the first hinge portion. A connecting rod is fixedly connected to the end of the hinged arm away from the drive plate, and a ball head that mates with the valve core is fixedly connected to the end of the connecting rod away from the hinged arm. By setting the ball head and mates it with the valve core connection end, a structure similar to a universal joint is formed, so that when the push rod pushes the valve core to move, it will not cause the push rod to deviate.

[0013] Preferably, the hinge arm is U-shaped and includes two parallel hinge plates. The ends of both hinge plates furthest from the connecting rod are hinged to a first hinge portion, which is located between the two hinge plates. This structural arrangement, with the first hinge portion positioned between the two hinge plates, makes the connection between the first hinge portion and the hinge arm more stable, reduces the occurrence of hinge arm breakage, and increases the service life of the device.

[0014] Preferably, the hinged arm further includes a connecting portion for connecting the hinge plate and the connecting rod, and the ends of the two hinge plates away from the connecting portion are provided with a second hinge portion that hinges to the first hinge portion; the connection of the connecting portion, the hinge plate, and the second hinge portion makes the hinged arm form a groove for avoiding the third gear. The groove allows the push rod to avoid the second and third gears during movement, thus saving space and increasing the compactness of the device structure.

[0015] Preferably, the housing extends upward and downward on the side near the opening of the mounting cavity to form mounting plates, and a reinforcing rib is fixedly connected between the mounting plate on the upper side of the housing and the housing. The mounting plate enhances the stability of the device when connected to the valve body of the reversing valve, while the reinforcing rib further strengthens the stability of the device during installation.

[0016] In summary, the beneficial effects of this utility model are as follows: the motor output shaft drives the drive plate to rotate via gear transmission, which in turn drives the push rod hinged to the eccentric position of the drive plate to move, thereby pushing the valve core to move axially. By replacing the solenoid valve with a mechanical mechanism such as a motor and gear set to drive the valve core, when switching valve cores is required, only the motor needs to be started to directly drive the valve core. Compared to a solenoid valve, the pilot oil flow process is eliminated, resulting in a faster response speed in driving the valve core. Furthermore, compared to a solenoid valve, the mechanical structure of this device is more stable, and the force output by the push rod is more stable, effectively reducing the occurrence of valve jamming. This makes it more suitable for use on agricultural machinery such as tractors that need to operate under complex conditions. Attached Figure Description

[0017] Figure 1 This is a first-view structural schematic diagram of the present invention; Figure 2 This is a structural schematic diagram of the present invention from a second perspective; Figure 3 This is a schematic diagram of the internal structure of the shell from a first-person perspective. Figure 4 This is a structural schematic diagram of the interior of the shell from a second perspective; Figure 5 This is a schematic diagram of the structure in which the push rod cooperates with the transmission mechanism and drive plate.

[0018] In the diagram: 1-Housing; 2-Mounting plate; 3-Reinforcing rib; 4-Motor; 5-Mounting cavity; 6-Ball head; 7-Connecting rod; 8-Hinged arm; 9-First gear; 10-Second gear; 11-Third gear; 12-First shaft; 13-Rotating part; 14-Second shaft; 15-Gear tooth part; 16-Push rod; 17-First hinge part; 18-Drive plate; 19-Connecting part; 20-Hinged plate; 21-Second hinge part. Detailed Implementation

[0019] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0020] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0021] The following is a description of preferred embodiments of the present invention in conjunction with the accompanying drawings.

[0022] like Figure 1 , Figure 2 , Figure 3 As shown, this utility model provides a reversing valve core driving device, including a housing 1, a mounting cavity 5 with an opening on one side on the housing 1, a motor 4 fixedly mounted on the bottom of the housing 1, a second rotating shaft 14 rotatably mounted in the mounting cavity 5, a drive plate 18 fixedly mounted on the second rotating shaft 14, and a push rod 16 for pushing the valve core is hinged to the drive plate 18 at a position offset from the second rotating shaft 14. The drive plate 18 and the output shaft of the motor 4 are driven by a transmission mechanism.

[0023] In order to make the device more stable when installed on the reversing valve, the side of the housing 1 near the opening of the mounting cavity 5 is extended upward and downward to form a mounting plate 2. The mounting plate 2 located on the upper side of the housing 1 is fixedly connected to the housing 1 with a reinforcing rib 3.

[0024] The mounting plate 2 has a reserved hole, and the valve body of the reversing valve also has a threaded hole corresponding to the reserved hole. During installation, the push rod 16 is connected to one end of the valve core, and then the bolt is used to pass through the reserved hole and install it on the threaded hole of the valve body, thereby realizing the installation of this device.

[0025] like Figure 3 , Figure 4As shown, the transmission mechanism described above can be any mechanism capable of driving the drive plate 18 to rotate. For example, a first sprocket is coaxially fixedly connected to the output shaft of the motor 4, and a second sprocket is coaxially fixedly connected to the second rotating shaft 14. The first sprocket and the second sprocket are connected by a chain drive. In this embodiment, in order to make the transmission more precise and stable, the transmission mechanism in this embodiment includes a first gear 9 rotatably mounted in the mounting cavity 5. The first gear 9 is coaxially fixedly connected to the output shaft of the motor 4. A first rotating shaft 12 is rotatably mounted in the mounting cavity 5. A second gear 10 and a third gear 11 are coaxially fixedly connected to the first rotating shaft 12. The first gear 9 meshes with the second gear 10. The drive plate 18 includes a toothed portion 15 that meshes with the third gear 11. The center of the toothed portion 15 is located on the axis of the second rotating shaft 14.

[0026] The drive plate 18 also includes a circular rotating part 13, which is coaxially and fixedly connected to the second rotating shaft 14. The rotating part 13 and the gear tooth part 15 are combined to form an incomplete gear.

[0027] The first hinge portion 17 is formed by protruding at the edge of the rotating part 13. Specifically, the first hinge portion 17, the rotating part 13, and the gear tooth portion 15 are integrally formed. The first hinge portion 17 is hinged to the end of the push rod 16 away from the reversing valve.

[0028] The pitch circle diameters of the incomplete gear formed by the rotating part 13 and the gear teeth, the second gear 10, the third gear 11, and the first gear 9 decrease sequentially.

[0029] The push rod 16 includes a hinge arm 8 that is hinged to the first hinge part 17. A connecting rod 7 is fixedly connected to one end of the hinge arm 8 away from the drive plate 18. A ball head 6 that mates with the valve core is fixedly connected to one end of the connecting rod 7 away from the hinge arm 8.

[0030] Since the push rod 16 is directly driven by the rotating drive plate 18, and the valve core moves linearly within the valve hole, the push rod 16 will inevitably tilt when pushing the valve core. Therefore, the end of the push rod 16 near the valve core is set as a ball head, while the end of the valve core near the push rod is provided with a cylindrical or ball socket, ensuring that the ball head 6 can rotate appropriately within it. Furthermore, the larger size of the opening in the mounting cavity 5 is also to prevent the push rod 16 from contacting the inner wall of the housing 1 when tilted.

[0031] The hinge arm 8 is U-shaped and includes two parallel hinge plates 20. The ends of the two hinge plates 20 away from the connecting rod 7 are both hinged to the first hinge part 17, which is located between the two hinge plates 20. The hinge arm 8, the connecting rod 7, and the ball head 6 are integrally formed.

[0032] The articulated arm 8 also includes a connecting portion 19 for connecting the articulated plate 20 and the connecting rod 7. The ends of the two articulated plates 20 away from the connecting portion 19 are provided with a second articulated portion 21 that is hinged to the first articulated portion 17. The connection of the connecting portion 19, the articulated plate 20 and the second articulated portion 21 makes the articulated arm 8 form a groove for avoiding the third gear 11.

[0033] The operating principle of this device is as follows: First, install this device on the valve body of the reversing valve. When it is needed, start the motor 4. The motor 4 drives the first gear 9 to rotate, and transmits the power to the drive plate 18 through the transmission of the second gear 10 and the third gear 11. The rotation of the drive plate 18 will drive the push rod 16 to move, thereby pushing the valve core to move laterally.

[0034] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A valve core drive device for a reversing valve, comprising a housing (1), characterized in that The housing (1) is provided with a mounting cavity (5) with an opening on one side. A motor (4) is fixedly installed at the bottom of the housing (1). A second rotating shaft (14) is rotatably installed in the mounting cavity (5). A drive plate (18) is fixedly installed on the second rotating shaft (14). A push rod (16) for pushing the valve core is hinged at a position off the second rotating shaft (14) of the drive plate (18). The drive plate (18) and the output shaft of the motor (4) are connected by a transmission mechanism.

2. The diverter valve spool drive apparatus of claim 1, wherein, The transmission mechanism includes a first gear (9) rotatably mounted in the mounting cavity (5), the first gear (9) being coaxially fixedly connected to the output shaft of the motor (4), a first rotating shaft (12) being rotatably mounted in the mounting cavity (5), a second gear (10) and a third gear (11) being coaxially fixedly connected on the first rotating shaft (12), the first gear (9) meshing with the second gear (10); the drive plate (18) includes a toothed portion (15) meshing with the third gear (11), the center of the toothed portion (15) being located on the axis of the second rotating shaft (14).

3. The diverter valve spool drive apparatus of claim 2, wherein, The drive plate (18) also includes a circular rotating part (13), which is coaxially fixedly connected to the second rotating shaft (14). The rotating part (13) and the gear tooth part (15) are combined to form an incomplete gear.

4. The diverter valve spool drive apparatus of claim 3, wherein, The first hinge (17) is formed by protruding outward at the edge of the rotating part (13), and the first hinge (17) is hinged to the end of the push rod (16) away from the opening of the mounting cavity (5).

5. The diverter valve spool drive apparatus of claim 4, wherein, The first hinge part (17), the rotating part (13), and the gear tooth part (15) are integrally formed structures.

6. The diverter valve spool drive apparatus of claim 3, wherein, The pitch circle diameters of the incomplete gear, the second gear (10), the third gear (11), and the first gear (9) formed by the rotating part (13) and the gear teeth decrease sequentially.

7. The diverter valve spool drive apparatus of claim 4, wherein, The push rod (16) includes a hinge arm (8) hinged to the first hinge part (17). A connecting rod (7) is fixedly connected to one end of the hinge arm (8) away from the drive plate (18). A ball head (6) that cooperates with the valve core is fixedly connected to one end of the connecting rod (7) away from the hinge arm (8).

8. The diverter valve spool drive apparatus of claim 7, wherein, The hinge arm (8) is U-shaped and includes two parallel hinge plates (20). The ends of the two hinge plates (20) away from the connecting rod (7) are both hinged to the first hinge part (17), which is located between the two hinge plates (20).

9. The diverter valve spool drive apparatus of claim 8, wherein, The hinge arm (8) also includes a connecting part (19) for connecting the hinge plate (20) and the connecting rod (7). The two hinge plates (20) are provided with a second hinge part (21) at one end away from the connecting part (19) and hinged to the first hinge part (17). The connection of the connecting part (19), the hinge plate (20) and the second hinge part (21) makes the hinge arm (8) form a groove for avoiding the third gear (11).

10. The diverter valve spool drive apparatus of claim 1, wherein, The housing (1) extends upward and downward on the side near the opening of the mounting cavity (5) to form a mounting plate (2), and a reinforcing rib (3) is fixedly connected between the mounting plate (2) on the upper side of the housing (1) and the housing (1).

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