Actuator limiting device

Abstract

The utility model provides an actuator limiting device which comprises an actuator shell, a plurality of microswitches arranged in the actuator shell and a limiting assembly which is inserted into the actuator shell and pokes the microswitches through rotation. According to the actuator limiting device, a traditional structure that a spring is linked to the cam is abandoned, a novel gear meshing structure is adopted, and aiming at angle adjustment of the cam, the gear and the gear ring can be linked to be meshed only by rotating the adjusting shaft above the limiting main shaft, so that the cam is driven to complete angle change outside the limiting main shaft, and adjustment of the cam is achieved.

Description

Technical Field

[0001] This utility model relates to the field of actuator technology, specifically to an actuator limiting device. Background Technology

[0002] In modern industrial production and various automated equipment, actuators, as key components for achieving mechanical motion control, are crucial for their accuracy and stability. Limiting devices are one of the core components ensuring the safe and reliable operation of actuators within specified ranges, directly impacting the overall system's efficiency and safety. Currently, most common actuator cam-based limiting methods on the market use a spring to fix the cam on the limiting spindle. For example, the micro-cam structure for valve body limit switches disclosed in patent publication number CN212480310U has significant drawbacks: spring-fixed methods are easily affected by external factors such as vibration and impact during equipment operation. When the equipment is in a vibrating environment, the spring may loosen, causing the cam's position to shift, thus affecting the actuator's limiting accuracy. Long-term vibration may also cause spring fatigue damage, further reducing the reliability of the limiting device and increasing the safety risks of equipment operation. Summary of the Invention

[0003] This utility model proposes an actuator limiting device, which solves the problem of insufficient stability of actuator limiting devices in the prior art, which increases the safety risks of equipment operation.

[0004] The technical solution of this utility model is implemented as follows:

[0005] An actuator limiting device includes an actuator housing, a plurality of microswitches disposed in the actuator housing, and a limiting component inserted into the actuator housing to actuate the microswitches by rotation;

[0006] The limiting assembly includes an output shaft and a limiting main shaft located above it. The periphery of the limiting main shaft has multiple mounting grooves extending through it. An adjusting shaft is placed in the mounting groove, and a gear is fixed to the outside of the adjusting shaft. A cam and a bushing surrounding the adjusting shaft are fitted around the limiting main shaft. The cam has a gear ring inside that meshes with the gear. The rotation of the adjusting shaft in the mounting groove causes the gear ring to drive the cam to adjust its circumference.

[0007] Furthermore, a positioning sleeve is integrally connected above the limiting spindle, and a cover plate is fitted on the outside of the positioning sleeve. A gasket is provided on the top of the cover plate, and the gasket is fixed in the positioning sleeve of the limiting spindle by screws.

[0008] Furthermore, the top of the cover plate is provided with a scale located around the gasket, and the pointer of the corresponding scale is fixed inside the actuator housing by screws.

[0009] Furthermore, the adjustment shaft has a slot or cross groove above it, and extends through and to the top of the cover plate and the gasket.

[0010] Furthermore, the bottom of the cover plate has a positioning ring that extends downward to surround and limit the end of the spindle, with the lower part of the positioning ring corresponding to the upper part of the bushing and pressing it tightly.

[0011] Furthermore, a rubber flat washer and a sealing gasket are respectively provided between the positioning ring, bushing, cam and the limiting spindle below the corresponding mounting groove.

[0012] Furthermore, there are at least two cams, and the number of adjusting shafts is the same as the number of cams. The gears on the adjusting shafts at different positions have different heights, each corresponding to a cam at a different position.

[0013] Furthermore, a positioning groove is provided below the mounting groove on the limiting spindle, and a positioning protrusion corresponding to the insertion into the positioning groove is provided below the adjusting shaft.

[0014] Furthermore, a slot is provided below the limiting spindle, and an insertion shaft is provided above the output shaft for inserting into the slot. A pin is also provided through the insertion shaft and the limiting spindle to fix both.

[0015] The beneficial effects of the technical solution provided in this application are as follows:

[0016] This actuator limiting device abandons the traditional spring-linked cam structure and adopts a novel gear meshing structure. For cam angle adjustment, simply rotate the adjusting shaft above the limiting spindle to engage the gear and gear ring, thereby driving the cam to change angle outside the limiting spindle and achieving cam adjustment. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the actuator limiting device of this utility model;

[0019] Figure 2 This is a schematic diagram of the limiting component of this utility model;

[0020] Figure 3 This is an exploded view of the limiting component of this utility model.

[0021] In the picture:

[0022] 10 Actuator housing, 20 Limit assembly, 30 Pointer, 40 Micro switch;

[0023] 21 Output shaft, 211 Insert shaft, 212 Pin, 22 Limiting spindle, 221 Positioning sleeve rod, 222 Positioning groove, 223 Slot, 23 Mounting groove, 24 Adjusting shaft, 241 Positioning protrusion, 25 Gear, 26 Cam, 27 Bushing, 28 Gear ring, 29 Cover plate, 291 Dial, 292 Washer, 293 Positioning ring. Detailed Implementation

[0024] The technical solution of this utility model will be clearly and completely described below with reference to its embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0025] Reference Figure 1-3 An actuator limiting device includes an actuator housing 10, in which a plurality of microswitches 40 are disposed, and a limiting component 20 inserted into the actuator housing 10 to actuate the microswitches 40 by rotation; the limiting component 20 includes an output shaft 21 and a limiting main shaft 22 disposed above it, the periphery of the limiting main shaft 22 is provided with a plurality of mounting grooves 23 extending above it, an adjusting shaft 24 is placed in the mounting grooves 23, and a gear 25 is fixed to the outside of the adjusting shaft 24; a cam 26 and a bushing 27 surrounding the adjusting shaft 24 are fitted on the outside of the limiting main shaft 22, the cam 26 has a gear ring 28 meshing with the gear 25, and the gear 25, through the rotation of the adjusting shaft 24 in the mounting grooves 23, acts on the gear ring 28 to drive the cam 26 to adjust circumferentially.

[0026] The through mounting groove 23 around the limiting spindle 22 provides a stable rotation path for the adjusting shaft 24 and limits its axial displacement, ensuring adjustment accuracy. The gear 25 outside the adjusting shaft 24 meshes with the gear ring 28 inside the cam 26, converting the rotational motion into the circumferential angle adjustment of the cam, achieving precise transmission. The cam 26, fitted outside the limiting spindle 22, directly controls the triggering of the micro switch 40, while the bushing 27 wraps around the adjusting shaft 24 to reduce friction loss and enhance structural stability. The rigid meshing of the gear ring 28 completely avoids displacement caused by vibration. By rotating the adjusting shaft 24, the gear 25 is driven to rotate. The meshing of the gear 25 with the gear ring 28 inside the cam 26 forces the cam to rotate synchronously around the limiting spindle 22, completing the angle adjustment. The bushing 27 buffers friction and fixes the component position during transmission. The self-locking characteristic of the gear meshing replaces the spring fixing method, allowing the cam 26 to remain absolutely fixed even under vibration, thereby ensuring limiting accuracy and device reliability.

[0027] In some embodiments, a positioning sleeve 221 is integrally connected to the upper part of the limiting spindle 22. A cover plate 29 is fitted onto the outside of the positioning sleeve 221. A gasket 292 is located on the upper part of the cover plate 29. The gasket 292 is fixed in the positioning sleeve 221 of the limiting spindle 22 by screws. The positioning sleeve 221 is integrally connected to the limiting spindle 22, providing a precise installation positioning reference for the cover plate 29. The fixing of the cover plate 292 and the positioning sleeve 221 by screws ensures that the cover plate 29 and the limiting spindle 22 are axially tightly fitted. This not only seals the internal structure to prevent foreign objects from entering, but also enhances the axial pressure resistance of the limiting spindle 22. The gasket 292 disperses the local stress when the screws are tightened, preventing the cover plate 29 from deforming and improving the reliability of the fastening. The integrated design of the positioning sleeve 221 and the limiting spindle 22 forms a rigid support. The cover plate 29 is locked to the positioning sleeve 221 by screws through the washer 292, achieving axial fixation and sealing. The washer 292 distributes pressure evenly during the tightening process, which not only protects the cover plate 29 from deformation, but also ensures the anti-loosening performance of the screws under long-term vibration environment, thereby maintaining the stable connection between the limiting spindle 22 and the external components, and improving the overall anti-interference and service life of the device.

[0028] In some embodiments, the top of the cover plate 29 is provided with a scale 291 located around the gasket 292, and a pointer 30 corresponding to the scale 291 is fixed inside the actuator housing 10 by screws. The scale 291 added to the top of the cover plate 29 cooperates with the pointer 30 fixed inside the actuator housing 10 to form a visual angle indication system. The scale 291 rotates synchronously with the limiting spindle 22, providing the operator with a real-time reference for the circumferential adjustment angle of the cam 26; the pointer 30 is fixed to the housing 10 by screws, serving as a static reference mark to accurately calibrate the scale value, simplifying the manual adjustment process and improving the intuitiveness and accuracy of the limiting angle setting. When the adjusting shaft 24 drives the cam 26 to rotate, the scale 291 rotates synchronously with the limiting main shaft 22, and the pointer 30 remains stationary because it is fixed to the housing 10. The relative position of the two directly reflects the actual adjustment angle of the cam 26. By observing the scale value pointed to by the pointer 30, the operator can quickly and accurately calibrate the limit position without relying on external measuring tools, which significantly improves the adjustment efficiency and the controllability of the device.

[0029] In some embodiments, the adjusting shaft 24 has a slot or cross-shaped groove on its upper surface, extending through and to the top of the cover plate 29 and the gasket 292. The slot or cross-shaped groove design on the top of the adjusting shaft 24 provides a standardized tool interface, allowing for direct rotation of the adjusting shaft 24 using tools such as screwdrivers, without disassembling the cover plate 29. The upward extension of the adjusting shaft 24 through the top of the cover plate 29 and the gasket 292 exposes the adjusting interface, significantly improving adjustment convenience while maintaining the seal of the cover plate 29 to prevent external contamination from entering the internal structure. Applying rotational force by inserting a tool into the slot on the top of the adjusting shaft 24 directly drives the gear 25 to mesh with the gear ring 28, thereby driving the cam 26 to precisely adjust the angle. The design of the adjusting shaft 24 extending to the outside of the cover plate 29 ensures that the adjustment action does not damage the sealing structure of the cover plate 29, simplifying the operation process and ensuring the device's dustproof and anti-interference capabilities in complex environments.

[0030] In some embodiments, the bottom of the cover plate 29 has a positioning ring 293 extending downward to surround the end of the limiting spindle 22. The lower part of the positioning ring 293 corresponds to the upper part of the bushing 27 and presses it tightly. The positioning ring 293 at the bottom of the cover plate 29 extends downward to surround the end of the limiting spindle 22, providing an axial positioning reference to ensure the precise alignment of the cover plate 29 and the limiting spindle 22. At the same time, the positioning ring 293 presses the upper part of the bushing 27, enhancing the contact stability between the bushing 27 and the limiting spindle 22, reducing bushing loosening or displacement caused by vibration or impact, thereby improving the overall rigidity and anti-interference capability of the transmission structure. The positioning ring 293 forms an axial constraint by wrapping around the end of the limiting spindle 22, limiting the installation deviation of the cover plate 29; its pressing effect on the bushing 27 increases the friction between the bushing 27 and the limiting spindle 22, preventing the bushing 27 from shifting due to uneven force or vibration during gear meshing, ensuring that the adjustment action of the cam 26 is always based on stable support, and ultimately ensuring the long-term operating accuracy and reliability of the limiting device.

[0031] In some embodiments, rubber flat washers and sealing gaskets are respectively provided between the positioning ring 293, bushing 27, cam 26, and the limiting spindle 22 below the corresponding mounting groove 23. The rubber flat washers and sealing gaskets are respectively positioned between the positioning ring 293, bushing 27, cam 26, and the mounting groove 23 below the limiting spindle 22. Through elastic deformation, they compensate for the assembly gaps between the components, achieving multiple sealing protection and effectively isolating external dust and liquid intrusion. Simultaneously, they buffer vibration and impact during transmission, reduce direct friction and wear between metal parts, enhance the stability of the connection structure, and ensure that the meshing accuracy of the gear 25 and gear ring 28 is not affected by the environment. The rubber flat washers utilize their elastic properties to fill the microscopic gaps on the component contact surfaces, forming a flexible sealing layer that blocks contaminants from entering the core transmission area. The sealing gaskets further enhance the sealing performance of key connection parts and reduce noise and mechanical loss by absorbing vibration energy. The two work together to maintain the dynamic stability between the limit spindle 22, cam 26, and bushing 27, and extend the service life of the device under harsh working conditions, ensuring the long-term accuracy and reliability of the limit adjustment.

[0032] In some embodiments, there are at least two cams 26, and the number of adjusting shafts 24 is the same as the number of cams 26. The gears 25 on the adjusting shafts 24 at different positions have different heights, corresponding to cams 26 at different positions. By setting at least two cams 26 and an equal number of adjusting shafts 24, and designing different heights for the gears 25 on the different adjusting shafts 24, each adjusting shaft 24 independently drives the corresponding cam 26, achieving independent adjustment of multiple cams in different zones. The difference in gear height avoids meshing interference during multi-axis linkage, ensuring that the adjustment actions of each cam 26 do not affect each other, thus supporting precise control and collaborative operation of multiple limit points under complex working conditions. Each adjusting shaft 24 meshes only with the gear ring 28 of the corresponding cam 26 through the height-differentiated gear 25. When a specific adjusting shaft 24 is rotated, only the cam 26 matching its gear is driven to rotate around the limit main shaft 22, while other cams 26 remain stationary due to the gear height misalignment. This design achieves modular operation of independent adjustment of multiple cams and eliminates multi-axis linkage interference through physical isolation, ensuring the adjustment accuracy of each limit point and the overall stability of the system.

[0033] In some embodiments, a positioning groove 222 is provided on the limiting spindle 22 below the mounting groove 23, and a positioning protrusion 241 corresponding to the positioning groove 222 is provided below the adjusting shaft 24. The positioning groove 222 on the limiting spindle 22 and the positioning protrusion 241 at the bottom of the adjusting shaft 24 cooperate with each other to form a bidirectional limiting structure in the axial and radial directions, ensuring the precise alignment of the adjusting shaft 24 in the mounting groove 23 and avoiding misalignment of the gear 25 and gear ring 28 due to force deviation during rotation; at the same time, it simplifies the assembly process, and the fixing of the adjusting shaft 24 is quickly completed by the snap-fit ​​of the protrusion 241 and the groove 222, improving the installation efficiency and the overall stability of the component. When the adjusting shaft 24 is installed, the positioning protrusion 241 at its bottom is inserted into the positioning groove 222 of the limiting spindle 22, which restricts the lateral displacement and tilt of the adjusting shaft 24 and only allows it to rotate around its own axis. This design uses physical engagement to force calibration of the relative position of the adjusting shaft 24 and the limiting spindle 22, ensuring that the meshing surfaces of the gear 25 and the gear ring 28 are always in the best contact state, thereby eliminating transmission deviations caused by assembly errors or vibrations and ensuring the accuracy and repeatability of the cam 26 angle adjustment.

[0034] In some embodiments, a slot 223 is provided below the limiting spindle 22, and an insertion shaft 211 is provided above the output shaft 21 for inserting into the slot 223. A pin 212, which secures both the insertion shaft 211 and the limiting spindle 22, is also provided through the insertion shaft 211. The slot 223 below the limiting spindle 22 and the insertion shaft 211 at the top of the output shaft 21 achieve precise alignment of the two shafts through a plug-in connection, ensuring the concentricity of the limiting spindle 22 and the output shaft 21 and the efficiency of power transmission. The pin 212 forms a rigid connection through the insertion shaft 211 and the limiting spindle 22, completely eliminating the risk of relative displacement between the two shafts, enhancing the torsional strength and vibration resistance of the overall structure, and ensuring the operational stability of the actuator under high-speed or high-load conditions. After the insert shaft 211 is inserted into the slot 223, the pin 212 passes laterally through the reserved holes of both shafts, and the two shafts are forcibly fixed by interference fit or threaded locking to form an unremovable mechanical connection. This design uses the shear strength of the pin 212 to resist axial and radial loads, ensuring that the limiting spindle 22 and the output shaft 21 always maintain synchronous rotation under complex stress environment, avoiding transmission errors or power loss caused by loosening between shafts, thereby improving the dynamic accuracy and reliability of the actuator limiting device.

[0035] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An actuator limiting device, characterized in that, Includes an actuator housing (10), which is provided with a plurality of microswitches (40), and a limiting assembly (20) inserted into the actuator housing (10) to actuate the microswitches (40) by rotation. The limiting assembly (20) includes an output shaft (21) and a limiting main shaft (22) located above it. The periphery of the limiting main shaft (22) is provided with a plurality of mounting grooves (23) that pass through it. An adjusting shaft (24) is placed in the mounting groove (23). A gear (25) is fixed to the outside of the adjusting shaft (24). A cam (26) and a bushing (27) surrounding the adjusting shaft (24) are fitted on the outside of the limiting main shaft (22). The cam (26) has a gear ring (28) that meshes with the gear (25). The gear (25) rotates in the mounting groove (23) through the adjusting shaft (24) to act on the gear ring (28) so that it drives the cam (26) to adjust circumferentially.

2. The actuator limiting device as described in claim 1, characterized in that, The upper part of the limiting spindle (22) is integrally connected to the positioning sleeve (221), and the outside of the positioning sleeve (221) is fitted with a cover plate (29). The upper part of the cover plate (29) has a gasket (292), and the gasket (292) is fixed in the positioning sleeve (221) of the limiting spindle (22) by screws.

3. The actuator limiting device as described in claim 2, characterized in that, The top of the cover plate (29) is provided with a dial (291) located around the gasket (292), and the inside of the actuator housing (10) is also fixed with a pointer (30) corresponding to the dial (291) by screws.

4. The actuator limiting device as described in claim 3, characterized in that, The adjusting shaft (24) has a slot or cross slot above it, and extends through and to the top of the cover plate (29) and the gasket (292).

5. The actuator limiting device as described in claim 2, characterized in that, The bottom of the cover plate (29) has a positioning ring (293) that extends downward to surround the end of the limiting spindle (22), and the lower part of the positioning ring (293) corresponds to the upper part of the bushing (27) and presses it tight.

6. The actuator limiting device as described in claim 5, characterized in that, Rubber flat washers and sealing gaskets are respectively provided between the positioning ring (293), bushing (27), cam (26) and the limiting spindle (22) below the corresponding mounting groove (23).

7. The actuator limiting device as described in claim 1, characterized in that, The number of cams (26) is at least two, and the number of adjustment shafts (24) is the same as the number of cams (26). The gears (25) on the adjustment shafts (24) at different positions have different heights, corresponding to the cams (26) at different positions.

8. The actuator limiting device as described in claim 1, characterized in that, The limiting spindle (22) has a positioning groove (222) below the mounting groove (23), and the adjusting shaft (24) has a positioning protrusion (241) below the positioning groove (222) corresponding to the insertion of the positioning groove (222).

9. The actuator limiting device as described in claim 1, characterized in that, A slot (223) is provided below the limiting spindle (22), and an insert shaft (211) for inserting into the slot (223) is provided above the output shaft (21). A pin (212) for fixing both is also provided through the insert shaft (211) and the limiting spindle (22).

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