High-precision travel switch
By introducing a lever amplification mechanism into the limit switch and using a screw as a fulcrum to amplify the stroke, the problem of poor repeatability in the existing technology is solved, and the triggering accuracy and repeatability are improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SUNS ELECTRIC ZHANGZHOU
- Filing Date
- 2025-05-27
- Publication Date
- 2026-05-05
AI Technical Summary
The trigger stroke of existing limit switches mainly depends on the stroke of the head trigger mechanism, resulting in poor repeatability accuracy.
A lever amplification principle is introduced between the head mechanism and the switch core module. The triggering accuracy is improved by using the lever amplification mechanism, and the stroke is amplified by using a screw as a fulcrum.
It improves the triggering accuracy and repeatability of the switch, achieves a magnified stroke effect, and makes the action more precise.
Smart Images
Figure CN224203974U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of switch technology, and in particular to a high-precision limit switch. Background Technology
[0002] Limit switches, also known as travel switches, are commonly used low-current control electrical appliances. They utilize the collision of moving parts in production machinery to actuate their contacts, thereby connecting or disconnecting control circuits to achieve certain control objectives. These switches are used to limit the position or travel of mechanical movement, causing the machinery to automatically stop, reverse, change speed, or automatically reciprocate at a certain position or travel. Existing limit switches typically have a head mechanism that directly links to the opening part, without intermediate travel amplification functions. The trigger travel of the switch mainly depends on the travel of the head trigger mechanism, resulting in poor repeatability of the switch action. Utility Model Content
[0003] To address the problems existing in the prior art, this utility model provides a high-precision limit switch. Utilizing the lever amplification principle, an auxiliary triggering mechanism based on the lever amplification principle is added between the head mechanism and the switch core module to control the movement of the head, thereby improving the triggering accuracy and repeatability of the switch. This utility model achieves this through the following technical solution:
[0004] As a further optimization of this technical solution, its structure includes a head mechanism and a switch structure. The head mechanism is fixedly installed at the rear end of the switch structure. The head mechanism is provided with a rocker arm, the end of which is provided with a roller. The front end of the head mechanism is provided with a plunger, and the plunger is connected to the rocker arm in a transmission connection.
[0005] The switch structure includes a housing, an internal support base, a switch core module mounted on the end face of the support base, two fixing screw holes at the top rear end of the switch core module, conductive structures installed in the two fixing screw holes, a switch core trigger rod at the center of the rear end of the switch core module, and the top of the housing is fixedly mounted by a top cover.
[0006] As a further optimization of this technical solution, the conductive structure includes a right rotating plate, a left rotating plate, and a screw. The screw passes through the right rotating plate, the spring washer, and the flat washer and is installed in a fixing screw hole on the right side of the switch core module, and the right rotating plate is rotatably connected to the screw. The screw passes through the left rotating plate, the spring washer, and the flat washer and is installed in a fixing screw hole on the left side of the switch core module, and the left rotating plate is rotatably connected to the screw hole.
[0007] As a further optimization of this technical solution, the side end of the plunger is provided with an O-ring and a collar, and the end face of the collar is fixedly connected to the sealing sleeve.
[0008] As a further optimization of this technical solution, the sealing sleeve is made of rubber, which has good insulation properties.
[0009] As a further optimization of this technical solution, the end face of the plunger is aligned with the end face of the right rotating plate, the end face of the right rotating plate is movably engaged with the end face of the left rotating plate, and the horizontal position of the left rotating plate is aligned with the trigger rod of the switch core.
[0010] As a further optimization of this technical solution, the right rotating plate and the left rotating plate are made of copper, which has good electrical conductivity.
[0011] Beneficial effects
[0012] This utility model provides a high-precision limit switch that has the following advantages compared with the prior art:
[0013] This invention achieves stroke amplification through the design of using a screw as a fulcrum. When the right and left rotating plates are subjected to a small displacement of the plunger, the screw acts as a fulcrum to fix the rotation center, allowing the left rotating plate to press against the trigger rod of the switch core to generate an amplified displacement. This enables the switch to switch on and off, thus achieving the effect of stroke amplification and improving the operation accuracy of the switch. Attached Figure Description
[0014] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:
[0015] Figure 1 This is a schematic diagram of the main structure of a high-precision limit switch according to this utility model.
[0016] Figure 2 This is a schematic diagram of the main structure of the head of a high-precision limit switch according to this utility model.
[0017] Figure 3 This is an exploded view of the switching structure of a high-precision limit switch according to this utility model.
[0018] Figure 4 This is a schematic diagram of the main structure of the switch core module of a high-precision limit switch according to this utility model.
[0019] Figure 5 This is a top-view cross-sectional view of the conductive structure of a high-precision limit switch of this utility model in the reset state.
[0020] Figure 6 This is a top-view cross-sectional view of the conductive structure of a high-precision limit switch according to this utility model in its working state.
[0021] Figure 7 This is a front view cross-sectional schematic diagram of the conductive structure of a high-precision limit switch according to this utility model.
[0022] Figure 8 This is a schematic diagram of the main structure of the left rotating plate of a high-precision limit switch according to this utility model.
[0023] Figure 9 This is a schematic diagram of the main structure of the right rotating plate of a high-precision limit switch according to this utility model.
[0024] Figure 10 This is a schematic diagram of the lever amplification principle of a high-precision limit switch according to this utility model.
[0025] In the diagram: Head mechanism 1, Switch structure 2, Rocker arm 11, Roller 12, Plunger 13, O-ring 14, Collar 15, Sealing sleeve 16, Outer shell 21, Support base 22, Switch core module 23, Top cover 24, Conductive structure 25, Switch core trigger rod 231, Screw hole 232, Right rotating plate 251, Left rotating plate 252, Screw 253, Spring washer 254, Flat washer 255. Detailed Implementation
[0026] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the preferred embodiments of this utility model are further described below in conjunction with specific implementation methods and accompanying drawings.
[0027] Example
[0028] Please see Figures 1-10 This utility model provides a high-precision limit switch, the structure of which includes a head mechanism 1 and a switch structure 2. The head mechanism 1 is fixedly installed at the rear end of the switch structure 2. The head mechanism 1 is provided with a rocker arm 11, the end of the rocker arm 11 is provided with a roller 12, and the front end of the head mechanism 1 is provided with a plunger 13. The rocker arm 11 can drive the plunger 13 to extend forward by swinging.
[0029] The switch structure 2 includes a housing 21, inside which is a support base 22. A switch core module 23 is mounted on the end face of the support base 22. The top rear end of the switch core module 23 is provided with two fixing screw holes 232, and a conductive structure 25 is installed in the two fixing screw holes 232. A switch core trigger rod 231 is provided at the center of the rear end of the switch core module 23. The top of the housing 21 is fixedly mounted by a top cover 24.
[0030] The conductive structure 25 includes a right rotating plate 251, a left rotating plate 252, and a screw 253. The screw 253 passes through the right rotating plate 251, the spring washer 254, and the flat washer 255 and is installed in the fixing screw hole 232 on the right side of the switch core module 23. The right rotating plate 251 is rotatably connected to the screw 253. The screw 253 passes through the left rotating plate 252, the spring washer 254, and the flat washer 255 and is installed in the fixing screw hole 232 on the left side of the switch core module 23. The left rotating plate 252 is rotatably connected to the screw hole 232. When the plunger 13 of the head mechanism moves and pushes the right rotating plate 251, the rotation triggers the middle of the left rotating plate 252, thereby amplifying the stroke and improving the precision of the switch operation.
[0031] The plunger 13 has an O-ring 14 and a collar 15 on its side end, and the end face of the collar 15 is fixedly connected to the sealing sleeve 16.
[0032] The sealing sleeve 16 is made of rubber and has good insulation properties.
[0033] The plunger 13 is aligned with the end face of the right rotating plate 251, the right rotating plate 251 is movably engaged with the end face of the left rotating plate 252, and the left rotating plate 252 is aligned with the horizontal position of the switch core trigger rod 231.
[0034] The right rotating plate 251 and the left rotating plate 252 are made of copper and have good electrical conductivity.
[0035] Working principle: When the limit switch is working, the external mechanical mechanism contacts the roller 12, which drives the rocker arm 11 to swing. The rocker arm 11 drives the plunger 13 to move forward and push the right rotating plate 251 to swing forward on the end face of the screw 253. The right rotating plate 251 drives the left rotating plate 252 to deflect forward and push the switch core trigger rod 231 to move forward, thereby triggering the switch contact switching of the switch core module 23 to achieve closure or opening.
[0036] By rotating the right rotating plate 251 and the left rotating plate 252 in the screw 253 respectively, the lever principle is applied. The stroke is amplified by the design of the fulcrum screw 253. When one end of the right rotating plate 251 and the left rotating plate 252 is subjected to a small displacement, the screw 253 acts as a fixed rotation center, causing the left rotating plate 252 to press against the trigger rod 231 of the switch core to produce an amplified displacement. The amplification factor is determined by the distance ratio between the two ends of the screw 253.
[0037] The formula is: magnification factor = working end length / trigger end length; for example, when the fulcrum is close to the trigger end, the working end can obtain a displacement magnification of 5-10 times.
[0038] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Without departing from the spirit or basic characteristics of this utility model, not only can this utility model be implemented in other specific forms, but various changes and modifications can also be made. All such changes and modifications fall within the scope of protection of this utility model. Therefore, the scope of protection of this utility model is defined by the appended claims and their equivalents, rather than by the foregoing description.
[0039] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
Claims
1. A high-precision limit switch, comprising a head mechanism (1) and a switch structure (2), wherein the head mechanism (1) is fixedly mounted on the rear end of the switch structure (2), characterized in that: The head mechanism (1) is provided with a swing arm (11), the end of the swing arm (11) is provided with a roller (12), the front end of the head mechanism (1) is provided with a plunger (13), and the plunger (13) is connected to the swing arm (11) in a transmission. The switch structure (2) includes a housing (21), inside which is provided a support base (22), and a switch core module (23) is installed on the end face of the support base (22). The top rear end of the switch core module (23) is provided with two fixing screw holes (232), and a conductive structure (25) is installed in the two fixing screw holes (232). A switch core trigger rod (231) is provided at the center of the rear end of the switch core module (23). The top of the housing (21) is fixedly installed by a top cover (24).
2. The high-precision limit switch according to claim 1, characterized in that: The conductive structure (25) includes a right rotating plate (251) and a left rotating plate (252) and a screw (253). The screw (253) passes through the right rotating plate (251), the spring washer (254), and the flat washer (255) and is installed in the fixing screw hole (232) on the right side of the switch core module (23). The right rotating plate (251) is rotatably connected to the screw (253). The screw (253) passes through the left rotating plate (252), the spring washer (254), and the flat washer (255) and is installed in the fixing screw hole (232) on the left side of the switch core module (23). The left rotating plate (252) is rotatably connected to the screw hole (232).
3. A high-precision limit switch according to claim 1, characterized in that: The plunger (13) has an O-ring (14) and a collar (15) on its side end, and the end face of the collar (15) is fixedly connected to the sealing sleeve (16).
4. A high-precision limit switch according to claim 3, characterized in that: The sealing sleeve (16) is made of rubber and has good insulation properties.
5. A high-precision limit switch according to claim 2, characterized in that: The plunger (13) is aligned with the end face of the right rotating plate (251), the right rotating plate (251) is movably engaged with the end face of the left rotating plate (252), and the left rotating plate (252) is aligned with the horizontal position of the switch core trigger rod (231).
6. A high-precision limit switch according to claim 2, characterized in that: The right rotating plate (251) and the left rotating plate (252) are made of copper and have good electrical conductivity.