Mechanical travel switch structure

Abstract

The application relates to a mechanical stroke switch structure which comprises a shell assembly, a connecting shaft assembly, a feedback assembly and a driving assembly, the shell assembly is internally provided with a mounting chamber; the connecting shaft assembly is partially arranged in the mounting chamber, and the two ends of the connecting shaft assembly extend out of the mounting chamber, at least one end of the connecting shaft assembly is used for being connected to the output end of a valve to drive the connecting shaft assembly to rotate; the feedback assembly comprises a plurality of generating units, the plurality of generating units are arranged in the mounting chamber; the driving assembly is movably connected with the connecting shaft assembly, the connecting shaft assembly is used for driving the driving assembly to synchronously rotate, the driving assembly is provided with a triggering part, and when the driving assembly rotates, the triggering part selectively triggers one of the generating units to output a switching quantity signal. Even if one of the generating units fails, the other generating units can still work normally, and the problem that an error signal is easily caused due to failure when a stroke switch single-path signal is output is avoided.

Description

Technical Field

[0001] This application relates to the field of limit switch technology, and in particular to a mechanical limit switch structure. Background Technology

[0002] The actual opening degree of a limit switch valve is a crucial operating parameter, directly reflecting its operational status. Often, the opening and closing status signals of important valve equipment have corresponding interlocking signals, directly affecting the unit's operating status. Limit switches can directly provide feedback on the valve's opening state; therefore, their accuracy is paramount. Currently available limit switches on the market have overly simplistic functions and cannot meet the needs of field applications.

[0003] First, because the ambient temperature of some valves is high, some reaching over 200°C, it is difficult for the limit switches currently on the market to operate normally under such high temperatures. Even if some exist, they are difficult to operate for extended periods, resulting in deviations in the feedback signal after each maintenance and a period of operation.

[0004] Secondly, the existing limit switches have fixed open and close feedback signals. For example, the close signal can only be around 0 degrees, while the open signal can only be around 90 degrees. However, the opening degree of many important valves in the field, such as the air extraction check valve and the high-pressure exhaust check valve, is often inconsistent, which makes it impossible to apply the existing limit switches in a uniform manner.

[0005] In addition, existing limit switches are all single-channel signal outputs. If a fault occurs, they are prone to sending incorrect signals. For important equipment, multiple redundant signal outputs should be configured, and the final signal output should be determined by logic voting at the upper level. Summary of the Invention

[0006] Based on this, it is necessary to address the problems of fixed and singular trigger positions and lack of signal redundancy in existing limit switches, and to provide a mechanical limit switch structure.

[0007] The first aspect of this application provides a mechanical limit switch structure, including:

[0008] A housing assembly having an installation chamber within it;

[0009] A coupling assembly, wherein the coupling assembly is partially disposed in the mounting chamber and both ends of the coupling assembly extend out of the mounting chamber, and at least one end of the coupling assembly is used to connect to the output end of the valve to drive the coupling assembly to rotate;

[0010] The feedback component includes multiple generating units, which are disposed within the mounting cavity;

[0011] A drive assembly is connected to the coupling assembly, the coupling assembly is used to drive the drive assembly to rotate synchronously, the drive assembly is provided with a trigger part, and when the drive assembly rotates, the trigger part can selectively trigger one of the generating units to output a switching signal.

[0012] In one embodiment, the coupling assembly includes:

[0013] The bearing is disposed in the mounting cavity;

[0014] A bearing cap is disposed between the bearing and the drive assembly to fix the bearing in the mounting cavity;

[0015] A connecting rod, which passes through the center of the bearing, with both ends of the connecting rod extending out of the mounting chamber, and the first end of the connecting rod being configured to dock with an analog feedback connector for converting the rotation angle of the connecting rod into a continuous analog electrical signal;

[0016] A coupling, wherein the coupling is connected to the second end of the connecting rod; and

[0017] A coupling joint, the first end of which is connected to the coupling, and the second end of which is configured to connect to the output end of the valve to receive the rotational torque output by the valve and transmit it to the connecting rod.

[0018] In one embodiment, the driving component includes:

[0019] A drive seat connected to the connecting rod, the drive seat being configured to rotate synchronously with the connecting rod, and the drive seat being adapted to move along the axial direction of the connecting rod;

[0020] A drive ring, which is connected to the drive seat, has its side protruding radially to form the trigger portion.

[0021] In one embodiment, the generating unit includes a contact and a mating part. The contact is located on the side of the generating unit facing the triggering part, and the mating part is movably located between the contact and the triggering part, so that when the drive ring rotates, the triggering part is adapted to press the mating part to move toward the contact to trigger the contact.

[0022] In one embodiment, the trigger portion and the contact point overlap in orthographic projection on a plane parallel to the axial direction of the coupling assembly.

[0023] In one embodiment, the feedback component further includes a plurality of heat insulation components disposed in the mounting chamber, wherein the plurality of heat insulation components are connected one-to-one with the plurality of generating units, and the heat insulation components are used to block heat transfer between the external environment and the generating units;

[0024] The plurality of the heat insulation elements are evenly spaced around the axial direction of the coupling assembly.

[0025] In one embodiment, the housing assembly includes a housing and a cover plate. The housing has a first mounting groove, the bearing is disposed in the first mounting groove, the cover plate is disposed at the opening of the housing, and both the cover plate and the housing have through holes coaxially formed. The connecting rod is adapted to pass through the through holes formed in the cover plate and the housing.

[0026] In one embodiment, the side wall of the housing is provided with a second mounting groove and a third mounting groove. The mechanical limit switch structure further includes a connector and a plug. The connector is disposed in the second mounting groove and is used to lead out a signal harness connected to the generating unit. The plug is disposed in the third mounting groove and is used to seal the third mounting groove.

[0027] In one embodiment, the mechanical limit switch structure further includes a fixing component connected to the housing assembly for fixing the housing assembly in a set position.

[0028] In one embodiment, the fixing component includes a plurality of fixing members, the first ends of which are connected to the housing, and the second ends of which are connected to a predetermined position.

[0029] This application provides a mechanical limit switch structure, which drives a drive component to rotate via a coupling assembly. When the drive component rotates, it can drive a trigger part mounted on it to rotate synchronously. The trigger part can selectively trigger one of the generating units in the feedback component, thereby realizing the output of multiple switching signals. Even if one of the generating units fails, the other generating units can still work normally, thereby improving the reliability of the signal output and avoiding the problem of issuing incorrect signals due to failure when the limit switch outputs a single signal.

[0030] In addition, the drive assembly and the coupling assembly are movably connected, so the trigger position between the trigger part of the drive assembly and the multiple generating units of the feedback assembly can be flexibly adjusted by adjusting the position of the drive assembly on the coupling assembly, thereby adapting to the stroke requirements of different equipment. Attached Figure Description

[0031] Figure 1 This is an exploded view of a mechanical limit switch structure according to an embodiment of this application.

[0032] Figure 2 This is an enlarged view of the generating unit A of a mechanical limit switch structure according to an embodiment of this application.

[0033] Figure 3 This is an assembly diagram of a mechanical limit switch structure according to an embodiment of this application.

[0034] Explanation of reference numerals in the attached figures:

[0035] 100. Housing assembly; 110. Housing; 111. First mounting slot; 112. Second mounting slot; 113. Third mounting slot; 114. Mounting chamber; 120. Cover plate; 130. Fastener; 140. Plug; 150. Connector;

[0036] 200. Coupling assembly; 210. Bearing; 220. Bearing cap; 230. Connecting rod; 240. Coupling; 250. Coupling joint;

[0037] 300. Feedback component; 310. Generating unit; 311. Contact; 312. Mating part; 320. Thermal insulation component;

[0038] 400. Drive assembly; 410. Drive ring; 411. Trigger unit; 420. Drive base;

[0039] 500. Fixing component; 510. Fastener. Detailed Implementation

[0040] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0041] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and 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, and therefore should not be construed as a limitation of this application.

[0042] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0043] like Figure 1 and Figure 3 As shown, an embodiment of this application provides a mechanical limit switch structure, including a housing assembly 100, a coupling assembly 200, a feedback assembly 300, and a drive assembly 400.

[0044] The housing assembly 100 has an installation chamber 114 inside, and the coupling assembly 200 is partially disposed in the installation chamber 114. Both ends of the coupling assembly 200 extend out of the installation chamber 114. At least one end of the coupling assembly 200 is used to connect to the output end of the valve so as to drive the coupling assembly 200 to rotate via the movement of the valve output end.

[0045] The feedback component 300 includes multiple generating units 310, which are disposed within the mounting chamber 114. It is understood that the generating units 310 are components capable of outputting electrical signals upon physical triggering, such as microswitches, limit switches, or proximity switches.

[0046] The drive assembly 400 is connected to the coupling assembly 200. The coupling assembly 200 is used to drive the drive assembly 400 to rotate synchronously. The drive assembly 400 is provided with a trigger part 411. When the drive assembly 400 rotates, the trigger part 411 provided thereon can rotate synchronously and can selectively trigger one of the generating units 310 of the feedback assembly 300 to output a switching signal.

[0047] Therefore, when the mechanical limit switch structure is in operation, the coupling assembly 200 can be connected to the output end of the valve so that the rotational motion output by the valve's output end is transmitted to the drive assembly 400 through the coupling assembly 200. The drive assembly 400 rotates synchronously with the coupling assembly 200 within the mounting chamber 114. When the drive assembly 400 rotates to a specific angle, its trigger part 411 contacts the corresponding generating unit 310, thereby physically triggering the generating unit 310. After being triggered, the corresponding generating unit 310 can output a switching signal (such as an on or off signal). Furthermore, by setting multiple generating units 310, multiple independent switching signals can be output at different rotation angle positions, thus avoiding the problem of insufficient reliability of a single signal.

[0048] In practical applications, one end of the coupling assembly 200 of the mechanical limit switch structure can be connected to the output shaft of rotating equipment such as valves, thereby converting the rotational motion of the valve into the rotation of the coupling assembly 200 itself. The rotation of the coupling assembly 200 directly drives the drive assembly 400, which is fixed to it, to rotate synchronously within the mounting chamber 114. Furthermore, as the valve opening changes, the angular displacement of the drive assembly 400 also changes. When the valve rotates to a preset opening position (e.g., fully closed, 50% open, fully open), the trigger part 411 on the drive assembly 400 can rotate precisely to align with and contact or press against the generating unit 310, which is preset at an angular position, thereby triggering the generating unit 310 to operate and output a switching signal representing a specific opening degree.

[0049] like Figure 1 As shown, in some embodiments, the coupling assembly 200 specifically includes a bearing 210, a bearing cap 220, a connecting rod 230, a coupling 240, and a coupling joint 250.

[0050] The bearing 210 is housed within the mounting chamber 114, and a bearing cap 220 is positioned between the bearing 210 and the drive assembly 400 to fix the bearing 210 in its designated position within the mounting chamber 114. A connecting rod 230 passes through the center of the bearing 210, with both ends extending out of the mounting chamber 114. The first end of the connecting rod 230 is configured to connect to an analog feedback connector to convert the rotation angle of the connecting rod 230 into a continuous analog electrical signal. A coupling 240 is connected to the second end of the connecting rod 230, and the first end of a coupling connector 250 is connected to the coupling 240. The second end of the coupling connector 250 is configured to connect to the output end of a valve to receive the rotational torque output by the valve and transmit it to the connecting rod 230.

[0051] Specifically, the bearing 210 provides stable and low-friction rotational support for the connecting rod 230, ensuring accurate angle transmission. After the bearing 210 is installed in the designated position within the mounting chamber 114, the bearing cap 220 can press the bearing 210 from one side to fix and limit its position within the mounting chamber 114. Simultaneously, the connecting rod 230, as the core drive shaft, receives external torque at one end via a coupling joint 250 and a coupling 240, while the other end outputs continuous angular displacement information. The coupling 240 can be a lamellar coupling 240, a diaphragm coupling 240, etc., to compensate for minor axial, radial, and angular displacement deviations that occur after the connecting rod 230 is connected to the coupling joint 250, ensuring a reliable connection between the coupling assembly 200 and the valve's output end.

[0052] More specifically, by connecting the connecting rod 230 of the coupling assembly 200 to the valve output end, the torque output by the connected valve can be smoothly transmitted, reducing transmission backlash. Furthermore, the first end of the connecting rod 230 can be machined into a D-shaped shaft, a flat section, or a keyway, etc., to mate with the input shafts of different valves. It also enables visualization of the rotation angle or continuous 4-20mA current signal output, enhancing the versatility and functionality of the limit switch.

[0053] Understandably, the first end of the linkage 230 is used to dock an analog feedback connector (e.g., a terminal for a 4–20mA signal line), which can also be directly connected to a mechanical indicator with a pointer and dial to provide a visual indication of the opening.

[0054] In some embodiments, the drive assembly 400 specifically includes a drive seat 420 and a drive ring 410. The drive seat 420 is connected to the connecting rod 230, configured to rotate synchronously with the connecting rod 230, and adapted to move axially along the connecting rod 230. The drive ring 410 is connected to the drive seat 420, and its side protrudes radially to form a trigger portion 411; the trigger portion 411 is at the same height as the contact point 311 of the generating unit 310.

[0055] Specifically, when the drive seat 420 moves along the axial direction of the connecting rod 230, the drive seat 420 can be fixed to any position in the axial direction of the connecting rod 230 by means of set screws, pins, or clamping sleeves, so as to realize the position adjustment of the drive seat 420 in the axial direction of the connecting rod 230. Furthermore, since the drive ring 410 can be installed on the drive seat 420 by means of fasteners 510 such as bolts, the drive ring 410 can adjust its position synchronously with the drive seat 420.

[0056] More specifically, the radially protruding trigger portion 411 of the drive ring 410 can be a bump, a boss, or a specific contoured surface. The provision of this trigger portion 411 enables the drive seat 420 and the drive ring 410 to trigger the contact point 311 of the generating unit 310, which is at the same level, during the rotation of the drive seat 420 and the drive ring 410 with the connecting rod 230. Thus, by employing an axially adjustable drive seat 420 and drive ring 410, different models of generating units 310 and generating units 310 at different contact point 311 heights can be flexibly adapted.

[0057] In addition, the trigger part 411 on the drive ring 410 can be designed with different protrusion angles as needed, such as 30°, 45°, 60°, 90°, etc., to match the rotation angle required by different valves from fully closed to fully open. Users can replace the corresponding drive ring 410 module according to the stroke of the field equipment.

[0058] like Figure 2As shown, in some embodiments, the generating unit 310 includes a contact 311 and a mating part 312. The contact 311 is disposed on the side of the generating unit 310 facing the triggering part 411, and the mating part 312 is movably disposed between the contact 311 and the triggering part 411, so that when the driving ring 410 rotates, the triggering part 411 is adapted to press the mating part 312 to move toward the contact 311 to trigger the contact 311.

[0059] Specifically, the mating part 312 can be a trigger arm, lever, or button provided on the generating unit 310. When the trigger part 411 of the drive ring 410 rotates to contact the mating part 312, the continuously applied radial pressure causes the mating part 312 to displace, thereby driving the mating part 312 to move towards the contact 311 until the contact 311 is triggered, thus outputting a switching signal. When the trigger part 411 no longer applies force to the mating part 312, the mating part 312 can self-reset to separate from the contact 311, at which point the contact 311 is no longer triggered and no switching signal is output.

[0060] In some embodiments, the feedback component 300 further includes a plurality of heat insulation components 320, which are connected one-to-one with a plurality of generating units 310. The heat insulation components 320 can be used to block heat transfer between the external environment and the generating unit 310, thereby ensuring the working stability of the generating unit 310 in a high-temperature environment.

[0061] Specifically, multiple heat insulation elements 320 are evenly distributed within the mounting chamber 114, with equal included angles between adjacent heat insulation elements 320. It is understood that the heat insulation elements 320 can be made of a material with low thermal conductivity, one side of which is connected to the housing assembly 100 by bolts, while the other side is used to mount the corresponding generating unit 310. Thus, the physical isolation provided by the heat insulation elements 320 significantly reduces the heat directly conducted from the outside of the high-temperature housing assembly 100 to the generating unit 310. Furthermore, the multiple heat insulation elements 320 are evenly distributed with equal included angles (for example, three heat insulation elements 320 are provided, with the included angle between the three heat insulation elements 320 being 120°), thereby ensuring that the multiple generating units 310 they support are also circumferentially evenly distributed within the mounting chamber 114, and ensuring that the drive ring 410, when rotating, can approach and trigger each generating unit 310 at the same interval.

[0062] Furthermore, the heat insulation component 320 can effectively reduce the operating environment temperature of the generating unit 310, thereby ensuring the stable operation of multiple generating units 310 at high temperatures. In addition, the evenly distributed arrangement of the heat insulation component 320 allows for a more rational distribution of the trigger points of the multiple generating units 310.

[0063] Specifically, the insulation component 320 can be made of ceramic, mica or special high-temperature resistant engineering plastics, and its thickness can be optimized according to the ambient temperature. For example, in environments above 200℃, a 3-5mm thick ceramic insulation board can be used.

[0064] In some embodiments, the housing assembly 100 specifically includes a housing 110 and a cover plate 120. The housing 110 has a first mounting groove 111, and the bearing 210 is disposed in the first mounting groove 111. The cover plate 120 is disposed at the opening of the housing 110, and both the cover plate 120 and the housing 110 have through holes coaxially formed. The connecting rod 230 is adapted to pass through both the through holes formed on the cover plate 120 and the housing 110.

[0065] In some embodiments, the sidewall of the housing 110 is provided with a second mounting groove 112 and a third mounting groove 113. The mechanical limit switch structure also includes a connector 150 and a plug 140. The connector 150 is disposed within the second mounting groove 112 and is used to lead out a signal harness connected to the generating unit 310. The plug 140 is disposed within the third mounting groove 113 and is used to seal the third mounting groove 113.

[0066] Specifically, the housing 110 can be configured as a cylindrical structure, with the first mounting groove 111 used to accommodate and position the bearing 210. The cover plate 120 is fixed to the opening of the housing 110 by fasteners 130 (such as bolts), and together with the surrounding side walls and bottom wall of the housing 110, forms a sealed mounting chamber 114. The second mounting groove 112 on the side wall of the housing 110 is usually a threaded hole, used to install various types of connectors 150 so that the signal harness can be centrally sealed and led out. In addition, the third mounting groove 113 serves as a reserved interface, normally sealed by a plug 140 (such as a metal screw plug). When additional signal output lines are required, the plug 140 can be removed to install other different types of connectors 150, thereby improving the expandability of the limit switch.

[0067] In some embodiments, the mechanical limit switch structure further includes a fixing component 500, which is connected to the housing assembly 100 to fix the housing assembly 100 in a set position. Specifically, the fixing component 500 includes a plurality of fixing members 510, the first ends of which are all connected to the housing 110, and the second ends of which are all connected to the set position. The fixing members 510 may be studs, double-ended studs, L-shaped brackets, or flange connectors. Their first ends are screwed into threaded holes on the bottom or side of the housing 110, and their second ends are fixed to the mounting bracket or equipment base in the field by nuts.

[0068] It should be noted that, to further improve the overall structure's high-temperature resistance and long-term reliability, major structural components such as the housing 110, cover plate 120, connecting rod 230, drive seat 420, drive ring 410, and fixing component 510 can be made of stainless steel (such as 304 or 316 stainless steel) or high-temperature alloy materials. The bearing 210 must be a deep groove ball bearing 210 or a ceramic bearing 210 lubricated with high-temperature grease. The generating unit 310 can be a microswitch with high-temperature resistant contact material and a high protection rating (such as IP67). Furthermore, the fixing component 500 is not limited to studs; it can also be a custom-shaped mounting plate or a clamp-type structure designed according to the mounting surface to meet the needs of different field installation interfaces.

[0069] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0070] It should be noted that if a component is described as "fixed to" or "set on" another component, it can be directly on the other component or there may be an intervening component. If a component is described as "connected to" another component, it can be directly connected to the other component or there may be an intervening component.

[0071] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A mechanical limit switch structure, characterized in that, include: A housing assembly (100) having an installation chamber (114) therein; A coupling assembly (200) is partially disposed within the mounting chamber (114), and both ends of the coupling assembly (200) extend out of the mounting chamber (114). At least one end of the coupling assembly (200) is used to connect to the output end of a valve to drive the coupling assembly (200) to rotate. The feedback component (300) includes a plurality of generating units (310), which are disposed within the mounting chamber (114); A drive assembly (400) is movably connected to the coupling assembly (200). The coupling assembly (200) is used to drive the drive assembly (400) to rotate synchronously. The drive assembly (400) is provided with a trigger part (411). When the drive assembly (400) rotates, the trigger part (411) can selectively trigger one of the generating units (310) to output a switching signal.

2. The mechanical limit switch structure according to claim 1, characterized in that, The coupling assembly (200) includes: Bearing (210), the bearing (210) is disposed in the mounting chamber (114); A bearing cap (220) is disposed between the bearing (210) and the drive assembly (400) for fixing the bearing (210) in the mounting chamber (114); A connecting rod (230) passes through the center of the bearing (210), with both ends of the connecting rod (230) extending out of the mounting chamber (114), and the first end of the connecting rod (230) is configured to dock with an analog feedback connector for converting the rotation angle of the connecting rod (230) into a continuous analog electrical signal. A coupling (240) connected to the second end of the connecting rod (230); and A coupling connector (250) is provided, the first end of which is connected to the coupling (240), and the second end of which is configured to be connected to the output end of the valve to receive the rotational torque output by the valve and transmit it to the connecting rod (230).

3. The mechanical limit switch structure according to claim 2, characterized in that, The drive component (400) includes: A drive seat (420) is connected to the connecting rod (230), the drive seat (420) is configured to rotate synchronously with the connecting rod (230), and the drive seat (420) is adapted to move along the axial direction of the connecting rod (230); A drive ring (410) is connected to the drive seat (420), and the side of the drive ring (410) protrudes radially to form the trigger portion (411).

4. The mechanical limit switch structure according to claim 3, characterized in that, The generating unit (310) includes a contact (311) and a mating part (312). The contact (311) is located on the side of the generating unit (310) facing the triggering part (411). The mating part (312) is movably located between the contact (311) and the triggering part (411) so that when the driving ring (410) rotates, the triggering part (411) is adapted to press the mating part (312) to move toward the contact (311) to trigger the contact (311).

5. The mechanical limit switch structure according to claim 4, characterized in that, The orthographic projections of the trigger part (411) and the contact point (311) on a plane parallel to the axial direction of the coupling assembly (200) overlap.

6. The mechanical limit switch structure according to claim 1, characterized in that, The feedback component (300) also includes a plurality of heat insulation components (320) disposed in the installation chamber (114), and the plurality of heat insulation components (320) are connected to the plurality of generating units (310) in a one-to-one correspondence. The heat insulation components (320) are used to block the heat transfer between the external environment and the generating unit (310). The plurality of the heat insulation elements (320) are evenly spaced around the axial direction of the coupling assembly (200).

7. The mechanical limit switch structure according to claim 2, characterized in that, The housing assembly (100) includes a housing (110) and a cover plate (120). The housing (110) has a first mounting groove (111) inside. The bearing (210) is located in the first mounting groove (111). The cover plate (120) is located at the opening of the housing (110). Both the cover plate (120) and the housing (110) have through holes coaxially. The connecting rod (230) is adapted to pass through both the cover plate (120) and the through holes in the housing (110).

8. The mechanical limit switch structure according to claim 7, characterized in that, The side wall of the housing (110) is provided with a second mounting groove (112) and a third mounting groove (113). The mechanical limit switch structure also includes a connector (150) and a plug (140). The connector (150) is located in the second mounting groove (112) and is used to lead out a signal harness connected to the generating unit (310). The plug (140) is located in the third mounting groove (113) and is used to seal the third mounting groove (113).

9. The mechanical limit switch structure according to any one of claims 1 to 8, characterized in that, The mechanical limit switch structure also includes a fixing component (500), which is connected to the housing assembly (100) to fix the housing assembly (100) in a set position.

10. The mechanical limit switch structure according to claim 9, characterized in that, The fixing component (500) includes a plurality of fixing members (510), the first ends of the plurality of fixing members (510) are connected to the housing (110), and the second ends of the plurality of fixing members (510) are connected to a set position.

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