Connecting structure for driving valve rod

Abstract

The utility model relates to the technical field of load-sensitive valves, in particular to a connecting structure for driving a valve rod. Comprising a valve rod, a first groove is formed in one end of the valve rod, a connecting block capable of being driven by a driving mechanism to axially move is installed in the first groove, a spring in a compressed state is arranged between the connecting block and the inner wall of the first groove, and a check ring used for preventing the valve rod from moving in the direction away from the spring is fixedly installed on the inner wall of the first groove. The check ring is located on the side, away from the spring, of the connecting block. By means of the structure, the elastic coefficient of the spring is large, after the connecting block is installed, the spring always exerts thrust towards the check ring on the connecting block, due to the check ring, the connecting block can firmly abut against the check ring all the time and cannot move, and then gapless connection between the valve rod and the connecting block is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to load sensitive valve technical field, concretely relates to a connecting structure for driving valve rod. BACKGROUND

[0002] In load sensitive valve, valve rod is mainly used for controlling the on-off between each oil way in valve body, and then controls the corresponding action of actuating mechanism, and the movement of valve rod is mainly driven through driving mechanism. SUMMARY

[0003] In view of the above problems, the utility model provides a connecting structure for driving valve rod to solve the problem that the gap exists between the connecting piece of driving mechanism and valve rod in prior art, thereby affecting the positioning accuracy of valve rod.

[0004] The utility model discloses a connecting structure for driving valve rod, including valve rod, one end of valve rod is equipped with first slot, and the first slot is installed with the connecting block that can be axially moved by the driving mechanism driving, and the spring in compression state is equipped between the connecting block and the inner wall of first slot, and the baffle ring for preventing valve rod from moving to the direction away from spring is fixedly installed on the inner wall of first slot, and the baffle ring is located on the side of connecting block away from spring.

[0005] Through the above structure, the elastic coefficient of spring is relatively big, after the installation of connecting block, spring always has a thrust to the connecting block to the direction of baffle ring, and because of the existence of baffle ring, connecting block will always firmly abut against baffle ring and not move, and then realize the gapless connection between valve rod and connecting block.

[0006] Preferably, the sidewall of the first slot is provided with a second slot, and the baffle ring is clamped in the second slot. Through the setting of the second slot, when the connecting block is pushed into the first slot and passes the position of the second slot, the baffle ring can be directly clamped in the second slot, thereby facilitating the installation of the baffle ring, and further facilitating the installation of the connecting block and the valve rod.

[0007] Preferably, the end of the valve rod provided with the first slot is further provided with a third slot communicated with the second slot. Through the setting of the third slot, when it is needed to separate the connecting block and the valve rod, only the baffle ring is buckled out through the third slot, and then the connecting block is extracted, thereby facilitating the disassembly of the connecting block.

[0008] Preferably, the connecting block is a sphere, the first groove is cylindrical, the diameter of the connecting block is the same as the diameter of the first groove, and the inner diameter of the retaining ring is smaller than the diameter of the connecting block. By making the connecting block a sphere, it becomes easier for the connecting block to be inserted into the first groove.

[0009] Preferably, the drive mechanism includes a housing with a through hole on the side near the valve stem for the valve stem to pass through. A motor is fixedly installed inside the housing, and the output shaft of the motor is connected to the connecting block via a transmission mechanism. By driving the connecting block to move with the motor, the valve stem is moved, resulting in a faster response speed and more precise movement of the valve stem.

[0010] Preferably, a mounting bracket is fixedly installed inside the housing. The transmission mechanism includes a first gear fixedly connected coaxially to the motor output shaft, a second gear rotatably mounted on the mounting bracket and meshing with the first gear, and a third gear fixedly connected coaxially to the second gear. A rack is fixedly mounted on the connecting block at the end away from the valve stem, and the rack meshes with the third gear. Through the cooperation of the gear set and the rack, the structure of this device is simpler and the position control is more precise.

[0011] Preferably, a mounting block is fixedly mounted on the mounting bracket, and a pressure block is mounted on the mounting block. The pressure block abuts against the side of the rack away from the third gear. The cooperation between the pressure block and the rack prevents the rack from wobbling up and down during the transmission between the third gear and the rack, thereby making the driving process of the drive mechanism more stable.

[0012] Preferably, the pressure block is a cylinder, which rotates with the mounting block via an axis, and the side wall of the pressure block abuts against the side of the rack away from the third gear. By making the pressure block a cylinder, the friction between the pressure block and the rack is changed from sliding friction to rolling friction, reducing friction and friction loss, making the rack move more smoothly, and further increasing the stability of the drive device in this apparatus.

[0013] Preferably, the mounting bracket has a horizontal "J" shape in its main view, with the bottom of the mounting bracket longer than the top. The bottom of the mounting bracket is fixedly connected to the motor, and the top of the mounting bracket is fixedly connected to the mounting block. The "J" shape of the mounting bracket allows the motor, the second gear, and the mounting block to be installed using only one mounting bracket, making the device more compact and saving installation space.

[0014] Preferably, the connecting block has a cross-section at one end near the spring. This cross-section design facilitates the manufacturing and processing of the connecting block.

[0015] In summary, the beneficial effects of this utility model are as follows:

[0016] 1. Through the cooperation of the connecting block, spring and check ring, the spring is always in a compressed state, so that the spring always has a pushing force on the connecting block towards the shell, and because of the existence of the check ring, the connecting block will always be firmly pressed against the check ring, thereby eliminating the error due to the gap between the driving mechanism and the valve rod during installation, and the precision of controlling the movement of the valve rod is higher.

[0017] 2. By using the motor to directly drive the movement of the connecting block, and then driving the movement of the valve rod, compared with the electromagnetic valve driving mode of the valve rod movement, the driving of the motor lacks the process of forming a pressure difference by the flow of pilot pressure oil, so that the driving mechanism drives the valve rod to move in a more direct way, and the response speed is faster; in addition, the mechanical connection mode controlled by the motor is also more convenient to control the distance of the valve rod movement, further improving the control precision of the valve rod. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a structure schematic view of the valve rod in the utility model;

[0019] Figure 2 It is a structure schematic view of the cooperation of the valve rod and the connecting block;

[0020] Figure 3 It is Figure 2 the local enlarged view of area "A" in the utility model;

[0021] Figure 4 It is a structure schematic view of the cooperation of the valve rod and the driving mechanism;

[0022] Figure 5 It is Figure 4 the local enlarged view of area "B" in the utility model;

[0023] Figure 6 It is a structure schematic view of the driving mechanism;

[0024] Figure 7 It is the first perspective view of the internal structure of the driving mechanism;

[0025] Figure 8 It is the second perspective view of the internal structure of the driving mechanism;

[0026] Figure 9 It is the front view of the internal structure of the driving mechanism.

[0027] In the drawing: 1- valve rod; 2- first groove; 3- second groove; 4- third groove; 5- rack; 6- check ring; 7- connecting block; 8- driving mechanism; 9- shell; 10- motor; 11- first gear; 12- second gear; 13- third gear; 14- mounting frame; 15- valve body; 16- spring; 17- pressing block; 18- through hole; 19- mounting block. DETAILED DESCRIPTION

[0028] The specific embodiments of the present application will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate the present application, but not to limit the scope of the present application.

[0029] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0030] The preferred embodiments of the present application are described below in conjunction with the accompanying drawings.

[0031] As shown in Figures 1 to 5 The utility model provides a kind of connecting structure for driving valve stem, including valve stem 1, first slot 2 is equipped in one end of valve stem 1, first slot 2 is equipped with the connecting block 7 that can be driven by drive mechanism 8 axial movement, connecting block 7 is equipped with spring 16 in compression state between first slot 2 inner wall, first slot 2 inner wall is fixedly installed with the retaining ring 6 for preventing valve stem 1 from moving towards the direction away from spring 16, retaining ring 6 is located in the side of connecting block 7 away from spring 16.

[0032] Among them, the spring 16 is relatively large, so that the valve stem 1 and connecting block 7 form relatively hard connection, that is, when connecting block 7 moves towards the direction close to spring 16, spring 16 will not be further compressed, but will drive valve stem 1 to move accordingly.

[0033] Annular second slot 3 is equipped on the side wall of first slot 2, retaining ring 6 is circular, and retaining ring 6 is clamped in second slot 3.In the installation of connecting block 7 and valve stem 1, first connecting block 7 is inserted into first slot 2 and extruded spring 16, when connecting block 7 passes the position of second slot 2, i.e. at this time, second slot 2 is located in the side of connecting block 7 away from spring 16, retaining ring 6 is clamped into second slot 3, then connecting block 7 can be released, and connecting block 7 will be abutted with retaining ring 6 under the action of spring 16, so as to realize the hard connection of connecting block 7 and valve stem 1.

[0034] In order to more conveniently disassemble connecting block 7, third slot 4 is further provided in the end of valve stem 1 provided with first slot 2 and communicated with second slot 3.When connecting block 7 needs to be disassembled, only retaining ring 6 is buckled out through third slot 4, and then connecting block 7 can be taken out, in other words, third slot 4 is provided to more conveniently buckle out retaining ring 6.

[0035] To facilitate better insertion of the connecting block 7 into the first groove 2, the connecting block 7 is spherical, and the first groove 2 is cylindrical. The diameter of the connecting block 7 is the same as the diameter of the first groove 2. For better installation, the diameter of the connecting block 7 can also be slightly smaller than the diameter of the first groove 2, depending on the actual operation, as long as the spring 16 can firmly hold the connecting block 7 against the retaining ring 6. The retaining ring 6 is a circular steel wire ring, and the inner diameter of the retaining ring 6 is smaller than the diameter of the connecting block 7. The spherical design of the connecting block 7 has stronger self-alignment and higher fault tolerance than the cylindrical design. However, the machining of the spherical connecting block 7 is more difficult. Therefore, to reduce some of the machining difficulty, the end of the connecting block 7 near the spring 16 is designed as a cross-section, which makes the machining and production of the connecting block 7 easier.

[0036] like Figure 4 , Figures 6 to 9 As shown, the drive mechanism 8 in this device includes a housing 9. The housing 9 has a through hole 18 on the side near the valve stem 1, through which the valve stem 1 can pass. A motor 10 is fixedly installed inside the housing 9. The output shaft of the motor 10 is connected to the connecting block 7 through a transmission mechanism.

[0037] The transmission mechanism in this device can be any mechanism that can be driven by the motor 10 and move the connecting block 7. For example, the output shaft of the motor 10 is connected to a threaded column through a gear set, and a threaded sleeve is fitted on the outside of the threaded column. The threaded sleeve is slidably installed in the housing 9, and the end of the threaded sleeve away from the threaded column is fixedly connected to the connecting block 7.

[0038] The threaded column and threaded sleeve are only one embodiment of the transmission mechanism. In addition, another embodiment is provided in this application. Specifically, the transmission mechanism includes a first gear 11 that is coaxially fixedly connected to the output shaft of the motor 10. A mounting bracket 14 is fixedly installed inside the housing 9. A second gear 12 that meshes with the first gear 11 is rotatably installed on the mounting bracket 14. A third gear 13 is coaxially fixedly connected to the second gear 12. A rack 5 is fixedly installed on the end of the connecting block away from the valve stem 1. The rack 5 meshes with the third gear 13.

[0039] Since only one end of the rack 5 is fixedly connected to the connecting block 7, while the other end is unrestricted, although the connecting block 7 is connected to the valve stem 1 and the valve stem 1 is restricted by the valve body 15, the end of the rack 5 away from the connecting block 7 is still a certain distance from the valve stem 1. When the third gear 13 and the rack 5 are in operation, the rack 5 is prone to floating up and down, resulting in poor meshing between them. Therefore, a mounting block 19 is fixedly installed on the mounting bracket 14, and a pressure block 17 is installed on the mounting block 19. The pressure block 17 abuts against the side of the rack 5 away from the third gear 13. This allows the rack 5 and the third gear 13 to mesh more stably, making the transmission between the rack 5 and the third gear 13 more stable.

[0040] The pressing block 17 in the above can be fixed, that is, the friction between the pressing block 17 and the rack 5 is sliding friction, but since the friction of sliding friction is large, the friction loss is high, so the pressing block 17 is provided as a cylinder, the pressing block 17 is rotatably connected with the mounting block 19 through the axis, and the side wall of the pressing block 17 abuts against the side of the rack 5 away from the third gear 13. Thus, the friction between the pressing block 17 and the rack 5 is converted from sliding friction to rolling friction, the friction between the pressing block 17 and the rack 5 is smaller, the friction loss is lower, and the movement of the rack 5 is more smooth.

[0041] As a further illustration of the present example, the main view of the mounting frame 14 is horizontally arranged "J" shape, the length of the bottom of the mounting frame 14 is longer than the length of the top, the bottom of the mounting frame 14 is fixedly connected with the motor 10 and rotatably connected with the second gear 12, and the top of the mounting frame 14 is fixedly connected with the mounting block 19. Through the arrangement of the mounting frame 5, the structure of the device is more simple and compact, and the installation space of the load-sensitive combined valve is saved.

[0042] The use principle of the device is as follows: when it is needed to install the driving mechanism 8 with the valve rod 1, first, the connecting block 7 of the driving mechanism 8 is inserted into the first slot 2 of the valve rod 1, then the retaining ring 6 is installed in the second slot 3 for limiting the movement of the connecting block 7, after the installation of the retaining ring 6 is completed, the connecting block 7 can be loosened, the loosened connecting block 7 is tightly abutted against the retaining ring 6 under the action of the elasticity of the spring 16, and since the elasticity coefficient of the spring 16 is large enough, no matter how the connecting block 7 drives the valve rod 1 to move, the connecting block 7 is tightly abutted against the retaining ring 6, and the installation position between the retaining ring 6 and the valve rod 1 is fixed, thereby the gap between the connecting block 7 and the valve rod 1 can be offset.

[0043] In summary, the valve rod connecting structure of the utility model through the cooperation of the connecting block 7, the spring 16 and the retaining ring 6, the spring 16 is always in a compressed state, so that the spring 16 always has a force pushing the connecting block 7 towards the housing 9, and since the retaining ring 6 exists, the connecting block 7 is always tightly abutted against the retaining ring 6, thereby eliminating the error due to the gap when the driving mechanism 8 is installed with the valve rod 1, and the precision when the valve rod 1 is controlled to move is higher; the movement of the connecting block 7 is directly driven by using the motor 10, and then the valve rod 1 is driven to move, compared with the movement mode of the electromagnetic valve driving the valve rod, the driving of the motor 10 lacks the process of the flow of the pilot pressure oil forming a pressure difference, thereby making the mode of the driving mechanism 8 driving the valve rod 1 to move more direct and the response speed faster; in addition, the mechanical connection mode controlled by the motor 10 is also more convenient to control the distance of the movement of the valve rod 1, and further improves the control precision of the valve rod 1.

[0044] The above merely is the preferred implementation form of the present application, and it should be noted that, for the ordinary skilled in the art, without departing from the technical principles of the present application, a number of improvements and substitutions can be made, and these improvements and substitutions should also be considered as the protection scope of the present application.

Claims

1. A connection structure for driving a valve stem, comprising a valve stem (1), characterized in that, One end of the valve stem (1) is provided with a first slot (2), a connecting block (7) axially movable by a driving mechanism (8) is installed in the first slot (2), a spring (16) in a compressed state is arranged between the connecting block (7) and the inner wall of the first slot (2), a stop ring (6) for preventing the valve stem (1) from moving away from the spring (16) is fixedly installed on the inner wall of the first slot (2), and the stop ring (6) is located on the side of the connecting block (7) away from the spring (16).

2. The connecting structure for driving a valve stem according to claim 1, wherein A second slot (3) is arranged on the side wall of the first slot (2), and the stop ring (6) is clamped in the second slot (3).

3. The connecting structure for driving a valve stem according to claim 2, wherein The end of the valve stem (1) provided with the first slot (2) is also provided with a third slot (4) in communication with the second slot (3).

4. The connecting structure for driving a valve stem according to claim 1, wherein The connecting block (7) is a sphere, the first slot (2) is a cylinder, the diameter of the connecting block (7) is the same as the diameter of the first slot (2), and the diameter of the inner side of the stop ring (6) is smaller than the diameter of the connecting block (7).

5. The connecting structure for driving a valve stem according to claim 1, wherein The driving mechanism (8) comprises a housing (9), a through hole (18) is arranged on the side of the housing (9) close to the valve stem (1) and can be passed through by the valve stem (1), a motor (10) is fixedly installed in the housing (9), and the output shaft of the motor (10) is in transmission connection with the connecting block (7) through a transmission mechanism.

6. The connecting structure for driving a valve stem according to claim 5, wherein The housing (9) is fixedly installed with a mounting bracket (14), the transmission mechanism comprises a first gear (11) fixedly connected with the output shaft of the motor (10) in a same axis, the mounting bracket (14) is rotatably installed with a second gear (12) engaged with the first gear (11), and the second gear (12) is fixedly connected with a third gear (13) in a same axis; a rack (5) is fixedly installed on the end of the connecting block away from the valve stem (1), and the rack (5) is engaged with the third gear (13).

7. The connecting structure for driving a valve stem according to claim 6, wherein The mounting bracket (14) is fixedly installed with a mounting block (19), the mounting block (19) is installed with a pressing block (17), and the pressing block (17) abuts against the side of the rack (5) away from the third gear (13).

8. The connecting structure for driving a valve stem according to claim 7, wherein The pressing block (17) is a cylinder, the pressing block (17) is rotatably connected with the mounting block (19) through an axis, and the side wall of the pressing block (17) abuts against the side of the rack (5) away from the third gear (13).

9. The connecting structure for driving a valve stem according to claim 7, wherein The front view of the mounting bracket (14) is in a horizontal "J" shape, the length of the bottom of the mounting bracket (14) is longer than the length of the top, the bottom of the mounting bracket (14) is fixedly connected with the motor (10), and the top of the mounting bracket (14) is fixedly connected with the mounting block (19).

10. The connecting structure for driving a valve stem according to claim 4, wherein The end of the connecting block (7) close to the spring (16) is provided with a transverse section.

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