Driving module and pneumatic actuating mechanism

Abstract

The utility model provides a driving module. The driving module comprises a box body connected between an air cylinder module and a spring module, a shifting fork assembly rotationally arranged in the box body, and a stop assembly arranged on the box body. The shifting fork assembly comprises a driving part reciprocating in the preset direction and a shifting fork driven by the driving part to rotate, the shifting fork is used for being connected with a valve rod of the valve, and the driving part can drive the shifting fork to be switched between a first rotation limit position and a second rotation limit position under driving of the air cylinder module and the spring module; the stop assembly comprises a first stop piece used for stopping the shifting fork at the first rotation limiting position and a second stop piece used for stopping the shifting fork at the second rotation limiting position, and the stop end of the first stop piece and the stop end of the second stop piece are each provided with a buffer pad. The driving module provided by the utility model can avoid damage caused by rigid contact between each retainer and the shifting fork, is favorable for improving the driving precision and prolonging the overall service life of equipment, and further has a good using effect.

Description

Technical Field

[0001] The utility model relates to the technical field of pneumatic actuators, in particular to a driving module. Meanwhile, the utility model also relates to a pneumatic actuator provided with the driving module. Background Art

[0002] Pneumatic scotch yoke actuators are widely used in oil refining, petrochemical, metallurgy, chemical, oil and gas, electric power and other industries, and can drive and realize the automatic operation of equipment such as ball valves, butterfly valves, plug valves, dampers and shutters. Pneumatic scotch yoke actuators are mainly composed of cylinder modules, drive modules (also known as scotch yoke modules) and spring modules. The drive module is mainly used to connect with the valve, and the cylinder module and elastic module are mainly used to provide the drive module with power to drive the valve to open and close.

[0003] Among them, the existing driving module usually includes a box body, a shift fork that rotates in the box body, and a stop bolt that stops the shift fork on the box body, and the rotation of the shift fork is driven by a cylinder module and a spring module. However, when the existing driving module is working, the stop action of its shift fork at the two extreme positions of the maximum rotation distance (generally corresponding to the two positions of the fully open and fully closed valve driven by the driving module) is easily damaged due to hard contact with the stop bolt, thereby affecting the service life and driving accuracy of the equipment and affecting the customer experience. Utility Model Content

[0004] In view of this, the present invention aims to provide a driving module to improve the use effect.

[0005] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0006] A driving module comprises a box body connected between a cylinder module and a spring module, a fork assembly arranged in the box body for rotation, and a stop assembly arranged on the box body;

[0007] The fork assembly includes a driving member that reciprocates along a preset direction, and a fork that is driven to rotate by the driving member, the fork is used to be connected to the valve stem of the valve, and the driving member can drive the fork to switch between a first rotation limit position and a second rotation limit position under the drive of the cylinder module and the spring module;

[0008] The stop assembly comprises a first stopper for stopping the shift fork at the first rotation limit position, and a second stopper for stopping the shift fork at the second rotation limit position, and buffer pads are provided at the stop ends of the first stopper and the second stopper.

[0009] Furthermore, the shift fork includes a rotating cylinder rotatably arranged on the box body, and a shift plate arranged on the rotating cylinder and linked with the driving member; a connecting hole for connecting with the valve stem is provided in the rotating cylinder, and a stop surface for abutting and cooperating with each of the stop ends is formed on the shift plate.

[0010] Furthermore, the number of the toggle plates is two and spaced apart from each other along the axial direction of the rotating drum, the axial direction of the rotating drum is perpendicular to the preset direction, and each of the toggle plates corresponds to a pair of the first stopper and the second stopper.

[0011] Furthermore, the first stopper and the second stopper both include a stopper rod disposed on the box body, the stopper end is an end of the stopper rod extending into the box body, and the depth of the stopper end extending into the box body is adjustable.

[0012] Furthermore, each of the stop rods is threadedly connected to the box body, and each of the stop rods is also threadedly connected with a stop nut for fixing the stop rod to the box body.

[0013] Furthermore, a guide rod extending along the preset direction is provided in the box body, and the driving member is guided and slidably arranged on the guide rod; and / or a sliding groove extending radially along the rotating drum is provided on the toggle plate, and the driving member is linked with the toggle plate by sliding a sliding rod slidingly arranged in the sliding groove.

[0014] Furthermore, the buffer pad is detachably connected to the stop end.

[0015] Furthermore, the buffer pad is provided with a clamping protrusion, the stop end is provided with a clamping groove, and the clamping protrusion is clamped in the clamping groove.

[0016] Furthermore, the buffer pad is provided with a screw connection column, the stop end is provided with a screw connection groove, and the screw connection column is screwed into the screw connection groove.

[0017] Compared with the prior art, the utility model has the following advantages:

[0018] The driving module described in the utility model can stop the shift fork in time at the first rotation limit position and the second rotation limit position through the coordinated setting of the first stop member and the second stop member, and the coordinated setting of the buffer pad can also avoid damage caused by hard contact between the stop members and the shift fork, which not only enables the shift fork to better switch between the two limit positions, but also can improve the driving accuracy and the overall service life of the equipment, thereby having a good use effect.

[0019] In addition, by setting the stop surface, the shift fork can better abut and cooperate with each stopper, thereby improving the reliability of the stop. Two shift plates are provided, and each shift plate corresponds to a first stopper and a second stopper, which can further improve the reliability and stability of the stop.

[0020] In addition, the depth of the stop end extending into the box body is adjustable, which can realize the adjustment of the rotation distance of the fork, thereby meeting the driving requirements of valves with different opening degrees. Each stop rod is screwed to the box body, and a stop nut is provided in cooperation, which is conducive to realizing the depth adjustment of the stop end. The buffer pad is detachably connected to the stop end, which is convenient for replacing the buffer pad.

[0021] Another object of the present invention is to provide a pneumatic actuator, comprising the driving module as described above.

[0022] The pneumatic actuator described in the utility model and the above-mentioned drive module have the same beneficial effects as the conventional technology, and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0024] Figure 1 It is a schematic diagram of the overall structure of the pneumatic actuator according to an embodiment of the utility model;

[0025] Figure 2 for Figure 1 A schematic diagram of the structure from another perspective of the structure shown in ;

[0026] Figure 3 for Figure 2 Sectional view along AA direction;

[0027] Figure 4 This is a schematic diagram of the structure of the driving module according to an embodiment of the utility model;

[0028] Figure 5 This is a structural schematic diagram of the fork assembly described in an embodiment of the utility model;

[0029] Figure 6 for Figure 4 A schematic diagram of the structure from another perspective of the structure shown in ;

[0030] Figure 7 for Figure 6 Cross-sectional view along the BB direction;

[0031] Figure 8 for Figure 7 Enlarged view of point C in the middle;

[0032] Fig. 9 It is a structural schematic diagram of a stop rod according to an embodiment of the utility model;

[0033] Fig.10 This is a schematic structural diagram of a buffer pad according to an embodiment of the utility model;

[0034] Fig.11 Another structural schematic diagram of the stop rod according to an embodiment of the utility model;

[0035] Fig.12 Another structural schematic diagram of the buffer pad according to an embodiment of the utility model;

[0036] Description of reference numerals:

[0037] 11. Cylinder body; 12. Piston; 121. Piston rod; 13. Guide rod;

[0038] 21. Box body; 211. Connecting flange; 2111. Stop hole; 22. Fork; 221. Rotating drum; 2211. Keyway; 222. Toggle plate; 2221. Sliding groove; 2222. Stop surface; 223. Connecting hole; 23. Driving member; 231. Sliding rod; 232. First mounting hole; 233. Second mounting hole; 24a. First stop member; 24b. Second stop member; 241. Stop rod; 2411. Slot; 2412. Screw groove; 242. Stop nut; 25. Buffer pad; 251. Slotting protrusion; 252. Screw column; 26. Guide rod;

[0039] 31. housing; 32. pull rod; 33. spring;

[0040] 100. Cylinder module; 200. Drive module; 300. Spring module. DETAILED DESCRIPTION

[0041] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0042] In the description of the present invention, it should be noted that if there are terms such as "upper", "lower", "inner", "outer" and the like indicating orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, if there are terms such as "first" and "second", they are also used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0043] In addition, in the description of the present invention, unless otherwise clearly defined, the terms "installation", "connection", "connection" and "connector" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood in combination with specific circumstances.

[0044] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0045] Embodiment 1

[0046] This embodiment relates to a driving module 200, the overall structure of which is as follows: Figures 1 to 12 As shown, it includes a box body 21 connected between the cylinder module 100 and the spring module 300 , a fork assembly rotatably arranged in the box body 21 , and a stop assembly arranged on the box body 21 .

[0047] Secondly, the fork assembly includes a driving member 23 that reciprocates along a preset direction, and a fork 22 that is driven to rotate by the driving member 23. The fork 22 is used to be connected to the valve stem of the valve, and the driving member 23 is driven by the cylinder module 100 and the spring module 300 to drive the fork 22 to switch between a first rotation limit position and a second rotation limit position.

[0048] Furthermore, the stop assembly includes a first stopper 24a for stopping the fork 22 at a first rotation limit position, and a second stopper 24b for stopping the fork 22 at a second rotation limit position, and buffer pads 25 are provided at the stop ends of the first stopper 24a and the second stopper 24b.

[0049] It can be understood that by providing the buffer pad 25, when the fork 22 rotates to the first rotation limit position or the second rotation limit position, it will not directly and rigidly contact the first stop member 24a or the second stop member 24b, but will stop with the cooperation of the first stop member 24a or the second stop member 24b after being buffered by the buffer pad 25. Such a setting can reduce the probability of damage to each stop member and the fork 22, and improve the reliability and life of the drive module 200.

[0050] At the same time, it should be mentioned that the fork 22 of this embodiment is used to drive the valve to open and close through the valve stem under the drive of the cylinder module 100 and the spring module 300. The first rotation limit position and the second rotation limit position correspond to the two positions of the valve being fully open and fully closed.

[0051] Furthermore, combined Figure 1 and Figure 3As shown, in the pneumatic actuator involved in this embodiment, the cylinder module 100 includes a cylinder body 11, a piston 12 slidably arranged in the cylinder body 11, and a piston rod 121 connecting the piston 12 and the driving member 23, and a guide rod 13 for guiding the movement of the piston 12 is also provided in the cylinder body 11. The guide rod 13 can preferably be set to be multiple, for example, four, so as to provide a guiding effect for the piston 12 while improving the stability of the translation of the piston 12 and avoiding the distortion of the piston 12 due to different local forces.

[0052] Secondly, the spring module 300 of this embodiment includes a housing 31, a spring 33 disposed in the housing 31, and a pull rod 32 connecting the spring 33 and the driving member 23, and the pull rod 32 can pull the spring 33 through the spring seat to improve the stability of use. It should still be mentioned that the preset direction of this embodiment is generally the same as the moving direction of the piston rod 121 in the cylinder module 100, that is, the same as the axial direction of the cylinder body 11.

[0053] Of course, the driving member 23 of this embodiment preferably adopts a slider commonly used by those skilled in the art, and the driving member 23 is provided with a first mounting hole 232 for connecting the piston rod 121 and a second mounting hole 233 for connecting the pull rod 32 at both ends along the preset direction. The relevant structural parts not mentioned in the pneumatic actuator of this embodiment can also refer to the various structures in the pneumatic actuator of the fork 22 well known to those skilled in the art, and will not be described in detail here.

[0054] Based on the above overall introduction, specifically, in this embodiment, as a preferred implementation form, Figure 4 and Figure 5 As shown, the shift fork 22 includes a rotating cylinder 221 rotatably disposed on the box body 21, and a shift plate 222 disposed on the rotating cylinder 221 and linked with the driving member 23. A connecting hole 223 for connecting with the valve stem is provided in the rotating cylinder 221, and a stop surface 2222 for abutting and cooperating with each stop end is formed on the shift plate 222.

[0055] It is understandable that, by setting the stop surface 2222, the shift fork 22 can better abut against each stop member, thereby improving the reliability of the stop. Moreover, in the specific structure, the connection hole 223 can also be preferably provided with a keyway 2211 for matching with the connection key on the valve stem, so as to ensure the reliability of the connection between the rotating cylinder 221 and the valve stem.

[0056] And it should be noted that due to the cutting angle, Figure 3 and Figure 7 The cross section of the drum 221 is not shown to be circular, but in actual structure it should be circular.

[0057] In the specific implementation, in this embodiment, as a preferred implementation form, Figure 3 and Figure 4 As shown, there are two toggle plates 222 arranged at intervals along the axial direction of the rotating drum 221, the axial direction of the rotating drum 221 is perpendicular to the preset direction, and each toggle plate 222 corresponds to a pair of first stoppers 24a and second stoppers 24b.

[0058] That is, each toggle plate 222 is correspondingly provided with a first stopper 24a and a second stopper 24b, so that the two toggle plates 222 can be stopped at the same time, which can further improve the stopping reliability and stability.

[0059] Furthermore, in this embodiment, as a preferred implementation form, Figure 7 and Figure 8 As shown, the first stopper 24a and the second stopper 24b both include a stopper rod 241 disposed on the box body 21, the stopper end is located at one end of the stopper rod 241 extending into the box body 21, and the depth of the stopper end extending into the box body 21 is adjustable.

[0060] Thus, the rotation distance of the shift fork 22 can be adjusted, thereby meeting the driving requirements of valves with different opening degrees. Of course, the buffer pad 25 of this embodiment is arranged on the stop end, and is specifically used to buffer the impact of the shift plate 222.

[0061] To elaborate, in this embodiment, as a preferred implementation form, each stop rod 241 is screwed on the box body 21, and each stop rod 241 is also screwed with a stop nut 242 for fixing the stop rod 241 on the box body 21. In this way, when it is necessary to adjust the depth of the stop end into the box body 21, the position of the stop rod 241 relative to the box body 21 can be adjusted by loosening the nut, thereby facilitating the depth adjustment of the stop end.

[0062] In addition, in this embodiment, as a preferred implementation form, Figure 3 As shown, a guide rod 26 extending along a preset direction is provided in the box body 21 , and the driving member 23 is guided and slidably arranged on the guide rod 26 to improve the stability of the guided movement of the driving member 23 .

[0063] At the same time, combined Figure 5 As shown, as a preferred implementation form, the toggle plate 222 of this embodiment is provided with a sliding groove 2221 extending radially along the rotating drum 221, and the driving member 23 is linked to the toggle plate 222 by a sliding rod 231 slidingly arranged in the sliding groove 2221.

[0064] In addition, in this embodiment, as a preferred implementation form, the buffer pad 25 is detachably connected to the stop end to facilitate the replacement of the buffer pad 25.

[0065] Among them, in this embodiment, as a preferred implementation form, as Fig. 9 and Fig.10 As shown, a clamping protrusion 251 is provided on the buffer pad 25, and a clamping groove 2411 is provided on the stop end. The clamping protrusion 251 is clamped in the clamping groove 2411, thereby making the installation of the buffer pad 25 more convenient.

[0066] Specifically, the locking protrusion 251 includes a protruding column and a locking bulge arranged on the side wall of the protruding column, and the locking slot 2411 includes a slot for the protruding column to be inserted, and a groove arranged on the side wall of the slot for the locking bulge to be locked in. When installing the buffer pad 25, the protruding column is inserted into the slot until the locking bulge is locked in the groove.

[0067] In addition, in this embodiment, as a preferred implementation form, Fig.11 and Fig.12 As shown, the buffer pad 25 is provided with a screw column 252, and the stop end is provided with a screw groove 2412, and the screw column 252 is screwed into the screw groove 2412. In this way, it is not only convenient to connect the buffer pad 25 with the stop rod 241, but also has better connection reliability.

[0068] It is still worth mentioning that, in this embodiment, a stopper is preferably provided on the box body 21 for preventing the valve from rotating relative to each other, so as to achieve positioning and installation between the valve and the box body 21, thereby reducing the difficulty of disassembly and assembly between the drive module 200 and the valve, thereby improving practicality.

[0069] Specifically, in this embodiment, as a preferred implementation form, Figure 4 As shown, a connection flange 211 for connecting to the valve is formed on one side of the box body 21 , and a avoidance hole for avoiding the valve stem from being inserted into the connection hole 223 is provided on the connection flange 211 .

[0070] Furthermore, the stopper portion includes a stop hole 2111 which is recessed on the connecting flange 211 , and the stop hole 2111 is used to cooperate with a protrusion on the valve to prevent the valve from rotating.

[0071] Here, by setting a connecting flange 211 on the box body 21, the installation of the box body 21 and the valve is facilitated, and by setting the avoidance hole, the assembly between the valve stem and the fork assembly can be ensured, and the stop part adopts a stop hole 2111, the structure is simple, and the overall manufacturing of the connecting flange 211 and the box body 21 is easy.

[0072] As a preferred implementation form, the stop hole 2111 of this embodiment extends along the radial direction of the avoidance hole. At the same time, the stop hole 2111 is divided into two on both sides of the avoidance hole, and the two stop holes 2111 can be specifically arranged in a mirror image. The advantage of such an arrangement is that it is conducive to ensuring the stability and reliability of the stop, that is, ensuring that the valve and the box body 21 are prevented from rotating relative to each other, thereby improving the assembly efficiency.

[0073] At the same time, as a preferred implementation form, the connection flange 211 of this embodiment is provided with a plurality of weight-reducing holes 2, and the plurality of weight-reducing holes are arranged at intervals along the circumference of the avoidance hole, which is conducive to realizing a lightweight design. In the specific structure, the number and arrangement of the weight-reducing holes can be set and adjusted according to the actual weight-reducing requirements, for example, they can be specifically set to be four or six holes evenly spaced at intervals along the circumference of the avoidance hole.

[0074] The driving module 200 of the present embodiment can stop the shift fork 22 in time at the first rotation limit position and the second rotation limit position through the coordinated setting of the first stop member 24a and the second stop member 24b, and the coordinated setting of the buffer pad 25 can also avoid damage caused by hard contact between the stops and the shift fork 22, which not only enables the shift fork 22 to switch better between the two limit positions, but also improves the driving accuracy and the overall service life of the equipment, thereby having a good use effect.

[0075] Embodiment 2

[0076] This embodiment relates to a pneumatic actuator, which includes the driving module 200 in the first embodiment.

[0077] The pneumatic actuator of this embodiment and the driving module 200 in the first embodiment have the same beneficial effects as compared with the conventional technology, and will not be described in detail here.

[0078] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A driving module (200), characterized in that: It comprises a box (21) connected between a cylinder module (100) and a spring module (300), a fork assembly rotatably arranged in the box (21), and a stop assembly arranged on the box (21); The shift fork assembly comprises a driving member (23) that reciprocates along a preset direction, and a shift fork (22) that is driven to rotate by the driving member (23), the shift fork (22) being used to be connected to a valve stem of a valve, and the driving member (23) is driven by the cylinder module (100) and the spring module (300) to drive the shift fork (22) to switch between a first rotation limit position and a second rotation limit position; The stop assembly comprises a first stopper (24a) for stopping the shift fork (22) at the first rotation limit position, and a second stopper (24b) for stopping the shift fork (22) at the second rotation limit position, and the stop ends of the first stopper (24a) and the second stopper (24b) are both provided with buffer pads (25).

2. The driving module (200) according to claim 1, characterized in that: The shift fork (22) comprises a rotating drum (221) rotatably arranged on the box body (21), and a shifting plate (222) arranged on the rotating drum (221) and linked to the driving member (23); The rotating cylinder (221) is provided with a connecting hole (223) for connecting with the valve stem, and the shifting plate (222) is formed with a stop surface (2222) for abutting and cooperating with each of the stop ends.

3. The driving module (200) according to claim 2, characterized in that: The toggle plates (222) are two arranged at intervals along the axial direction of the rotating cylinder (221); the axial direction of the rotating cylinder (221) is perpendicular to the preset direction, and each of the toggle plates (222) corresponds to a pair of the first stopper (24a) and the second stopper (24b).

4. The driving module (200) according to claim 2, characterized in that: The first stopper (24a) and the second stopper (24b) both comprise a stopper rod (241) disposed on the box body (21); the stopper end is located at an end of the stopper rod (241) extending into the box body (21); and the depth of the stopper end extending into the box body (21) is adjustable.

5. The driving module (200) according to claim 4, characterized in that: Each of the stop rods (241) is threadedly connected to the box body (21), and each of the stop rods (241) is also threadedly connected with a stop nut (242) for fixing the stop rod (241) to the box body (21).

6. The driving module (200) according to claim 2, characterized in that: A guide rod (26) extending along the preset direction is provided in the box body (21), and the driving member (23) is guided and slidably arranged on the guide rod (26); and / or, The toggle plate (222) is provided with a sliding groove (2221) extending radially along the rotating cylinder (221), and the driving member (23) is linked to the toggle plate (222) via a sliding rod (231) slidingly arranged in the sliding groove (2221).

7. The driving module (200) according to any one of claims 1 to 6, characterized in that: The buffer pad (25) is detachably connected to the stop end.

8. The driving module (200) according to claim 7, characterized in that: The buffer pad (25) is provided with a locking protrusion (251), the stop end is provided with a locking groove (2411), and the locking protrusion (251) is locked in the locking groove (2411).

9. The driving module (200) according to claim 7, characterized in that: The buffer pad (25) is provided with a screw connection column (252), the stop end is provided with a screw connection groove (2412), and the screw connection column (252) is screwed into the screw connection groove (2412).

10. A pneumatic actuator, characterized in that: A driving module (200) comprising any one of claims 1 to 9.

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