Indicating shaft mounting structure and driving module

Abstract

The utility model provides an indicating shaft mounting structure and a driving module, the indicating shaft mounting structure comprises an indicating shaft rotatably arranged on a box cover of the driving module, a bottom plate arranged at one end, close to a shifting fork shaft of the driving module, of the indicating shaft, and a shifting pin arranged on the shifting fork shaft, and the shifting pin is used for shifting the bottom plate. And the indicating shaft is driven to rotate. According to the indicating shaft installation structure, a force transmission and dispersion path can be set up, driving force transmitted by a shifting fork shaft is dispersed step by step, influences on the indicating shaft, a connecting structure of the indicating shaft and a limiting switch (or a positioner) and the limiting switch (or the positioner) are reduced, and therefore the problem that feedback of the opening degree of the indicating shaft is distorted is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of pneumatic actuators, in particular to an indicating shaft installation structure. Meanwhile, the utility model also relates to a driving module provided with the indicating shaft installation structure. 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] The housing of the existing drive module is usually provided with an indicating shaft connected to the limit switch (or positioner) to feedback the opening of the pneumatic actuator, and the indicating shaft is directly driven by a shift fork. This will result in the indicating shaft, the connecting part between the indicating shaft and the limit switch (or positioner), or the limit switch (or positioner) being easily damaged during the driving process of the shift fork, and the opening feedback being distorted, affecting the feedback accuracy of the indicating shaft. Utility Model Content

[0004] In view of this, the utility model aims to provide an indicating shaft installation structure, which can solve the problem of distortion in the feedback of the indicating shaft opening.

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

[0006] An indicator shaft installation structure includes an indicator shaft rotatably arranged on a box cover of a driving module, a base plate arranged on one end of a fork shaft of the indicator shaft close to the driving module, and a shift pin arranged on the fork shaft, wherein the shift pin is used to shift the base plate to drive the indicator shaft to rotate.

[0007] Furthermore, a shaft cover corresponding to the shift fork shaft is detachably provided on the box cover, and the indicating shaft is rotatably provided on the shaft cover.

[0008] Furthermore, the indicating shaft is rotatably arranged on the shaft cover through a guide sleeve.

[0009] Furthermore, a sealing ring is provided between the indicating shaft and the shaft cover, and the sealing ring is sleeved on the indicating shaft.

[0010] Furthermore, the sealing ring is located between the guide sleeve and the base plate.

[0011] Furthermore, a retaining spring is provided on a portion of the indicating shaft located outside the shaft cover, and the retaining spring is used to cooperate with the bottom plate to limit the indicating shaft from moving along its own axial direction.

[0012] Furthermore, a gasket is sandwiched between the retaining spring and the shaft cover.

[0013] Furthermore, the box cover is provided with a rotating chamber located between the shaft cover and the fork shaft, the bottom plate is rotatably arranged in the rotating chamber, and the bottom plate is spaced apart from the chamber wall of the rotating chamber; and / or the shaft cover is screwed to the box cover.

[0014] Furthermore, a connecting portion for connecting to a positioner or a limit switch is provided on one end of the indicating shaft away from the fork shaft; and / or an assembly hole for connecting to a box body of the driving module is provided on the box cover.

[0015] Compared with the prior art, the utility model has the following advantages:

[0016] The indicating shaft installation structure described in the utility model uses the toggle pin on the shift fork shaft to toggle the bottom plate, and then the bottom plate drives the indicating shaft to move, so that the driving force transmitted by the shift fork shaft can be transmitted to the limit switch (or positioner) through the toggle pin, the bottom plate and the indicating shaft, and then through the connecting structure between the indicating shaft and the limit switch (or positioner), so as to build a force transmission and dispersion path, disperse the driving force transmitted by the shift fork shaft step by step, reduce the influence on the indicating shaft, the connecting structure between the indicating shaft and the limit switch (or positioner), and the limit switch (or positioner), thereby solving the problem of distortion of the indicating shaft opening feedback.

[0017] In addition, the shaft cover can be detachably arranged on the box cover, which is conducive to the convenience of disassembly and assembly of the indicating shaft and the bottom plate on the box cover. The setting of the guide sleeve can reduce the wear between the indicating shaft and the shaft cover, improve the rotation stability of the indicating shaft, and buffer and disperse the force when the indicating shaft is subjected to force, thereby reducing the probability of structural damage.

[0018] In addition, the sealing ring can not only ensure the sealing inside the box, but also buffer and disperse the force when the indicating shaft is subjected to force. The setting of the retaining spring can cooperate with the bottom plate to limit the movement of the indicating shaft along its own axis, and prevent the indicating shaft from detaching from the shaft cover and causing structural instability. By setting a gasket, the effect of the retaining spring and the bottom plate in limiting the indicating shaft can be improved, and the force dispersion effect can be improved.

[0019] Another object of the present invention is to provide a driving module, on which the indicating shaft mounting structure as described above is provided.

[0020] The driving module of the present invention and the above-mentioned indicating shaft installation structure have the same beneficial effects as the conventional technology, and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] 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:

[0022] Figure 1 This is a schematic diagram of the structure in which the drive module according to an embodiment of the utility model is assembled on a pneumatic actuator;

[0023] Figure 2 and Figure 3 for Figure 1 Schematic diagram of the structure from other perspectives of the structure shown in;

[0024] Figure 4 for Figure 3 Sectional view along AA direction;

[0025] Figure 5 This is a schematic diagram of the structure of the driving module according to an embodiment of the utility model;

[0026] Figure 6 for Figure 5 Cross-sectional view along the BB direction;

[0027] Figure 7 for Figure 6 Enlarged view of point C in the middle;

[0028] Figure 8 It is a structural schematic diagram of the indicator shaft and the box cover when they are assembled according to the embodiment of the utility model;

[0029] Fig. 9 It is a structural schematic diagram of the indicator shaft and the toggle pin when they are assembled according to the embodiment of the utility model;

[0030] Fig.10 for Figure 5 A schematic diagram of the structure from another perspective of the structure shown in ;

[0031] Fig.11 This is a structural schematic diagram of the fork assembly described in an embodiment of the utility model;

[0032] Description of reference numerals:

[0033] 11. Cylinder body; 12. Piston; 121. Piston rod; 13. Guide rod;

[0034] 21. Box body; 211. Connecting flange; 2111. Stop hole; 2112. Weight-reducing hole; 22. Shift fork; 221. Shift fork shaft; 2211. Keyway; 2212. Toggle pin; 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; 24. Stop assembly; 241. Stop rod; 242. Stop nut; 25. Guide rod; 26. Box cover; 261. Shaft cover; 262. Rotating chamber; 263. Assembly hole; 27. Indicating shaft; 271. Connecting part; 28. Bottom plate; 29. ​​Guide sleeve; 201. Sealing ring; 202. Circlip; 203. Gasket;

[0035] 31. housing; 32. pull rod; 33. spring;

[0036] 100. Cylinder module; 200. Drive module; 300. Spring module. DETAILED DESCRIPTION

[0037] 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.

[0038] 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.

[0039] 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.

[0040] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0041] Embodiment 1

[0042] The present embodiment relates to an indicating shaft installation structure, which can solve the problem of distortion in the feedback of the opening of the indicating shaft 27, reduce the probability and number of equipment adjustment, and have a better use effect.

[0043] In terms of overall structure, Figures 1 to 11 As shown, the indicator shaft installation structure of this embodiment includes an indicator shaft 27 rotatably arranged on the box cover 26 of the driving module 200, a base plate 28 arranged on one end of the fork shaft 221 of the indicator shaft 27 close to the driving module 200, and a shifting pin 2212 arranged on the fork shaft 221, and the shifting pin 2212 is used to shift the base plate 28 to drive the indicator shaft 27 to rotate.

[0044] For specific structures, see Figure 8 and Fig. 9 As shown, the bottom plate 28 is preferably provided with a toggle groove that penetrates the bottom plate 28 , and the toggle pin 2212 is inserted into the toggle groove. The toggle pin 2212 can follow the fork shaft 221 to drive the indicating shaft 27 to rotate by toggling the bottom plate 28 .

[0045] At the same time, in order to reduce the impact of the pin of the fork 22 on the bottom plate 28, the bottom plate 28 can be set to a long strip shape, and the shift groove is preferably set to a long strip hole extending radially along the indicating shaft 27. If necessary, the shift groove can be connected to the end plate of the bottom plate 28 to form an opening for the shift pin 2212 to slide into, and the two ends of the bottom plate 28 can also be preferably set to a circular arc shape similar to the fork shaft 221.

[0046] Based on the above overall introduction, in this embodiment, as a preferred implementation form, Figure 2 ,and Figure 5 As shown, the box cover 26 is detachably provided with a shaft cover 261 corresponding to the fork shaft 221, and the indicator shaft 27 is rotatably provided on the shaft cover 261. Such a configuration can facilitate the convenience of disassembly and assembly of the indicator shaft 27 and the bottom plate 28 on the box cover 26.

[0047] Specifically, in this embodiment, as a preferred implementation form, Figure 6 and Figure 7 As shown, the indicating shaft 27 is rotatably arranged on the shaft cover 261 through the guide sleeve 29. Thus, the wear between the indicating shaft 27 and the shaft cover 261 can be reduced, the rotation stability of the indicating shaft 27 can be improved, and the force can be buffered and dispersed when the indicating shaft 27 is subjected to force, thereby reducing the probability of structural damage.

[0048] Moreover, in this embodiment, as a preferred implementation form, a sealing ring 201 is provided between the indicating shaft 27 and the shaft cover 261, and the sealing ring 201 is sleeved on the indicating shaft 27. The advantage of providing the sealing ring 201 is that it is not only conducive to ensuring the sealing inside the box body 21, but also can buffer and disperse the force when the indicating shaft 27 is subjected to force, thereby reducing the probability of damage to various components.

[0049] In this embodiment, as a preferred implementation form, Figure 7As shown, the sealing ring 201 is located between the guide sleeve 29 and the bottom plate 28. In a specific implementation, a mounting cavity for mounting the indicating shaft 27 can be provided through the shaft cover 261, and a mounting groove for mounting the sealing ring 201 and the guide sleeve 29 can be provided on the cavity wall of the mounting cavity, so as to facilitate the positioning and installation of the sealing ring 201 and the guide sleeve 29.

[0050] In addition, in this embodiment, as a preferred implementation form, Figures 7 to 9 As shown, a retaining spring 202 is provided on the portion of the indicating shaft 27 outside the shaft cover 261 , and the retaining spring 202 is used to cooperate with the bottom plate 28 to limit the indicating shaft 27 from moving along its own axial direction.

[0051] It is understandable that the setting of the retaining spring 202 can cooperate with the bottom plate 28 to limit the axial movement of the indicating shaft 27, thereby preventing the indicating shaft 27 from separating from the shaft cover 261 and causing structural instability.

[0052] Secondly, in this embodiment, as a preferred implementation form, a gasket 203 is sandwiched between the clamping spring 202 and the shaft cover 261 to improve the effect of the clamping spring 202 and the bottom plate 28 cooperating with the limit indicating shaft 27, and can improve the force dispersion effect. Of course, if necessary, a groove for the gasket 203 and / or the clamping spring 202 to be sleeved and installed can be provided on the indicating shaft 27 to improve the installation convenience of the gasket 203 and / or the clamping spring 202.

[0053] Moreover, based on the fact that the retaining spring 202 and the gasket 203 themselves have a certain elasticity, combined with the guide sleeve 29 and the sealing ring 201, these components can buffer and disperse the impact energy transmitted by the shift pin 2212 to the base plate 28 and the indicator shaft 27, thereby effectively reducing the influence of the movement of the shift fork 22 on the indicator shaft 27, the connection structure between the indicator shaft 27 and the limit switch (or positioner), and the limit switch (or positioner), thereby solving the problem of distortion in the opening feedback of the indicator shaft 27.

[0054] In addition, in this embodiment, as a preferred implementation form, Figure 7 As shown, the box cover 26 is provided with a rotating cavity 262 between the shaft cover 261 and the fork shaft 221 , the bottom plate 28 is rotatably disposed in the rotating cavity 262 , and a distance is set between the bottom plate 28 and the cavity wall of the rotating cavity 262 .

[0055] At the same time, it should be mentioned that one end of the fork shaft 221 close to the indicator shaft 27 also rotates on the box cover 26, and it is set at a distance from the shaft cover 261. Such a setting can form protection for the bottom plate 28 and the rotating shaft, and enhance the stability of the linkage between the fork shaft 221, the shift pin 2212, the bottom plate 28 and the indicator shaft 27.

[0056] Moreover, as a preferred implementation form, in this embodiment, the shaft cover 261 is screwed to the box cover 26 to facilitate the disassembly and assembly between the two and improve the structural reliability during assembly. Furthermore, based on the consideration of structural reliability and convenience of disassembly and assembly, the box cover 26 and the box body 21 are also preferably arranged to be screwed.

[0057] In addition, in this embodiment, as a preferred implementation form, Figure 8 and Fig. 9 As shown, a connecting portion 271 for connecting to a positioner or a limit switch is provided on one end of the indicating shaft 27 away from the fork shaft 221. At the same time, as a preferred embodiment, an assembly hole 263 for screwing to the housing 21 of the driving module 200 is provided on the box cover 26.

[0058] It is worth mentioning that the driving module 200 of this embodiment is a part of the pneumatic actuator. Figures 1 to 4 As shown, the box body 21 of this embodiment is connected between the cylinder module 100 and the spring module 300 , and the driving module 200 includes a fork assembly rotatably disposed in the box body 21 .

[0059] And combined with Fig.10 and Fig.11 As shown, 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.

[0060] The stop assembly 24 is used to stop the fork 22 at the first rotation limit position and the second rotation limit position. At this time, there are at least two stop assemblies 24, and at least one stop assembly 24 corresponds to the first rotation limit position of the fork 22, and at least one stop assembly 24 corresponds to the second rotation limit position of the fork 22.

[0061] At the same time, as a preferred implementation form, the stop assembly 24 of this embodiment includes a stop rod 241 threaded on the box body 21, and a stop nut 242 threaded on the stop rod 241 for fixing the stop rod 241 on the box body 21. The advantage of such a configuration is that after loosening the stop nut 242, the position of the stop rod 241 relative to the box body 21 can be adjusted, and the stop rod 241 after the adjusted position can be fixed by the stop nut 242, thereby realizing the adjustment of the stop position of the stop rod 241, that is, the adjustment of the first rotation limit position and the second rotation limit position of the fork 22, so as to meet the use requirements of valves with different opening and closing degrees.

[0062] Of course, the structural parts of the stop assembly 24 not mentioned can also refer to the common stop structures known to those skilled in the art, and will not be described in detail here.

[0063] It should be mentioned that the fork 22 of this embodiment is driven by the cylinder module 100 and the spring module 300 to drive the valve to open and close through the valve stem. 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.

[0064] In addition, in this embodiment, as a preferred implementation form, Figure 4 and Fig.11 As shown, a guide rod 25 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 25 to improve the stability of the guided movement of the driving member 23 .

[0065] In this embodiment, as a preferred implementation form, the shift fork 22 includes a shift fork shaft 221 rotatably disposed on the housing 21, and a shift plate 222 disposed on the shift fork shaft 221 and linked to the driving member 23. A connecting hole 223 for connecting to the valve stem is disposed in the shift fork shaft 221, and a stop surface 2222 for abutting and cooperating with each stop end is formed on the shift plate 222.

[0066] 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 connection reliability between the shift fork shaft 221 and the valve stem.

[0067] In the specific implementation, in this embodiment, as a preferred implementation form, there are two toggle plates 222 arranged axially at intervals along the fork shaft 221, the axial direction of the fork shaft 221 is perpendicular to the preset direction, and at least one of the toggle plates 222 corresponds to a pair of stop assemblies 24, that is, the toggle plate 222 is correspondingly provided with a stop assembly 24 at the two rotation limit positions.

[0068] At the same time, combined Figure 7 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 fork shaft 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 .

[0069] Furthermore, 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 is also provided in the cylinder body 11 for guiding the movement of the piston 12. 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.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] Specifically, in this embodiment, as a preferred implementation form, Fig.10 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 .

[0074] 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.

[0075] 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.

[0076] 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.

[0077] 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 2112, and the plurality of weight-reducing holes 2112 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 2112 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.

[0078] The indicator shaft installation structure of the present embodiment uses the toggle pin 2212 on the fork shaft 221 to toggle the bottom plate 28, and then the bottom plate 28 drives the indicator shaft 27 to move, so that the driving force transmitted from the fork shaft 221 can be transmitted to the limit switch (or positioner) through the toggle pin 2212, the bottom plate 28 and the indicator shaft 27, and then through the connection structure between the indicator shaft 27 and the limit switch (or positioner), so as to build a force transmission and dispersion path, and disperse the driving force transmitted by the fork shaft 221 step by step, thereby reducing the influence on the indicator shaft 27, the connection structure between the indicator shaft 27 and the limit switch (or positioner), and the limit switch (or positioner), thereby solving the problem of distortion of the opening feedback of the indicator shaft 27 and improving the feedback accuracy.

[0079] Embodiment 2

[0080] The present embodiment relates to a driving module 200 , on which the indicating shaft mounting structure in the first embodiment is provided.

[0081] The driving module 200 of this embodiment can solve the problem of feedback distortion of the opening of the indicating shaft 27 by setting the indicating shaft installation structure in the first embodiment, reduce the probability and number of equipment adjustment, and improve the use effect of the equipment.

[0082] 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. An indicating shaft installation structure, characterized in that: The invention comprises an indication shaft (27) rotatably arranged on a box cover (26) of a driving module (200), a bottom plate (28) arranged on one end of the indication shaft (27) close to a shift fork shaft (221) of the driving module (200), and a shift pin (2212) arranged on the shift fork shaft (221), wherein the shift pin (2212) is used to shift the bottom plate (28) to drive the indication shaft (27) to rotate.

2. The indicating shaft installation structure according to claim 1, characterized in that: The box cover (26) is detachably provided with a shaft cover (261) corresponding to the shift fork shaft (221), and the indicating shaft (27) is rotatably provided on the shaft cover (261).

3. The indicating shaft installation structure according to claim 2, characterized in that: The indicating shaft (27) is rotatably mounted on the shaft cover (261) via a guide sleeve (29).

4. The indicating shaft installation structure according to claim 3, characterized in that: A sealing ring (201) is provided between the indicating shaft (27) and the shaft cover (261), and the sealing ring (201) is sleeved on the indicating shaft (27).

5. The indicating shaft installation structure according to claim 4, characterized in that: The sealing ring (201) is located between the guide sleeve (29) and the bottom plate (28).

6. The indicating shaft installation structure according to claim 2, characterized in that: A retaining spring (202) is provided on the portion of the indicating shaft (27) located outside the shaft cover (261), and the retaining spring (202) is used to cooperate with the bottom plate (28) to limit the indicating shaft (27) from moving along its own axial direction.

7. The indicating shaft installation structure according to claim 6, characterized in that: A gasket (203) is sandwiched between the retaining spring (202) and the shaft cover (261).

8. The indicating shaft installation structure according to claim 2, characterized in that: The box cover (26) is provided with a rotation chamber (262) located between the shaft cover (261) and the shift fork shaft (221), the bottom plate (28) is rotatably arranged in the rotation chamber (262), and the bottom plate (28) and the cavity wall of the rotation chamber (262) are spaced apart; and / or, The shaft cover (261) is screwed to the box cover (26).

9. The indicator shaft installation structure according to any one of claims 1 to 8, characterized in that: A connecting portion (271) for connecting to a positioner or a limit switch is provided on one end of the indicating shaft (27) away from the shift fork shaft (221); and / or, The box cover (26) is provided with an assembly hole (263) for connecting with the box body (21) of the driving module (200).

10. A driving module (200), characterized in that: The driving module (200) is provided with an indication shaft mounting structure according to any one of claims 1 to 9.

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