Position triggering mechanism based on light interrupter

Abstract

The utility model discloses a position trigger mechanism based on light interrupter relates to automation control technical field, and the mechanism includes shell, light interrupter, pivot, trigger piece and press assembly, the light interrupter is fixed in the shell and has U -shaped groove, the pivot is fixed in the shell inside, the trigger piece rotation sleeve is established on the pivot, and has first end and second end, and the first end is adapted to U -shaped groove, press assembly is located the top of trigger piece second end, and press assembly includes return post and return compression spring, and one end of return post is used for abutting on trigger piece second end, and return compression spring sleeve is established on the outer periphery of return post. The utility model discloses utilize the on-off of non -contact light path to replace mechanical contact, has solved the problem of low reliability and short life of prior art because of contact wear, has the advantages of signal trigger high reliability, response sensitive and long service life.

Description

Technical Field

[0001] This utility model relates to the field of automation control technology, and in particular to a position triggering mechanism based on a light interruptor. Background Technology

[0002] In automated production lines, precision instruments, and various mechanical equipment, position triggering mechanisms are fundamental components for achieving process control, limit protection, and signal feedback. They are used to accurately detect whether moving parts have reached a predetermined position and output corresponding signals.

[0003] Currently, the most common devices for achieving this function are mechanical limit switches or micro switches. The working principle of these switches usually relies on direct contact of the mechanical structure: when an external moving part touches the switch's drive arm or pressing pin, the external force overcomes the resistance of the internal spring, forcing two or more internal metal electrical contacts to physically close or separate, thereby connecting or disconnecting the circuit and outputting an electrical signal.

[0004] However, this structure, which relies entirely on physical electrical contact, has revealed a series of inherent defects during long-term use. First, because the electrical contacts generate tiny electric arcs each time they close and open, especially under load, this arc erosion continuously corrodes the contact surface; at the same time, high-frequency mechanical collisions and friction also cause irreversible mechanical wear on the contacts and transmission components.

[0005] Over time, wear, ablation, and oxidation of contacts caused by moisture and dust in the environment can all lead to poor contact, increased resistance, and even contact adhesion or failure to conduct. This unreliability of the signal directly affects the stability of the entire automation system, causing equipment misjudgments, process interruptions, or safety hazards. Furthermore, its limited mechanical lifespan means that frequent maintenance and replacement are required, increasing operating costs.

[0006] Therefore, this invention proposes a position triggering mechanism based on an optical interruptor to address the shortcomings of existing technologies. Utility Model Content

[0007] In view of the problems of low signal triggering reliability and short service life caused by the reliance on mechanical electrical contacts in the existing position triggering mechanism, this utility model aims to provide a position triggering mechanism based on an optical interrupter with an improved structure that can effectively solve the above problems.

[0008] This utility model provides a position triggering mechanism based on a light interruptor, including: a housing, a light interruptor, a rotating shaft and a trigger plate; and a pressing assembly.

[0009] The optical interrupter has a U-shaped groove; the trigger plate has a first end and a second end; the pressing assembly includes a return post and a return spring.

[0010] Furthermore, the optical interrupter is fixed inside the housing, the rotating shaft is fixed inside the housing, the trigger plate is rotatably sleeved on the rotating shaft, and the first end of the trigger plate is adapted to extend into or disengage from the U-shaped groove; the pressing assembly is located above the second end of the trigger plate, one end of the return post is used to abut against the second end of the trigger plate, and the return spring is sleeved on the outer periphery of the return post and used to provide elastic force to the return post; under the elastic force of the return spring, the return post presses down on the second end of the trigger plate to drive the first end of the trigger plate to be embedded in the U-shaped groove in the default state to block the optical path of the optical interrupter; when the second end of the trigger plate is lifted by external force, its first end disengages from the U-shaped groove to conduct the optical path.

[0011] Preferably, the position triggering mechanism based on the optical interrupter further includes a cover, which is detachably connected to the opening of the housing for encapsulating internal components.

[0012] Preferably, the optical interrupter, the rotating shaft, the trigger plate, and the pressing assembly together constitute a control mechanism, which is housed within the housing and enclosed by the aforementioned cover to improve the overall protective performance.

[0013] Preferably, the return spring is a compression spring, with one end abutting against the flange of the return post and the other end abutting against the inner wall of the housing, providing a restoring force with the housing as support.

[0014] Preferably, as another embodiment, the return spring is a compression spring, with one end abutting against the flange of the return post and the other end abutting against the inner wall of the cover, providing a return spring force with the cover as support.

[0015] Preferably, the lower part of the second end of the trigger piece is provided with a contact surface for being lifted by the external force. The contact surface facilitates the introduction and smooth lifting of external parts, ensuring a stable triggering action.

[0016] Preferably, under the pressure of the pressing component, the trigger plate rotates clockwise around the rotating shaft; under the action of the external force, the trigger plate overcomes the pressure and rotates counterclockwise around the rotating shaft, with a clear action stroke.

[0017] Preferably, the first end of the trigger piece is made of opaque engineering plastic or metal to ensure that it can completely and effectively block the light path when embedded in the U-shaped groove.

[0018] This utility model has the following beneficial effects: 1. This utility model, by setting up a rotating shaft, a trigger plate, a pressing component and a light interruptor, utilizes the fact that when the trigger plate is supported by an external force, it rotates around the rotating shaft, causing one end to detach from or embed into the U-shaped groove of the light interruptor, thereby controlling the on / off of the light path in a non-contact manner. This solves the problem of wear, oxidation or poor contact that easily occurs due to physical contact in the mechanical contact switches used in the prior art, and achieves the technical effect of high signal triggering reliability, sensitive response and long overall service life.

[0019] 2. This utility model completely houses and encapsulates the internal control mechanism by setting up an outer shell and a cover, which solves the problem that the internal precision components, especially the sensing area of ​​the optical interrupter, are easily affected by external dust, moisture or oil, leading to malfunction or damage. It achieves the technical effect of good dust and moisture protection, adaptability to industrial environment, and ensuring long-term stable operation of the mechanism.

[0020] 3. This utility model, by setting a pressing assembly including a return spring and a return post, applies continuous and stable downward pressure to the trigger plate, which solves the problem of some switches failing to reset or having weakened spring force due to poor reset structure design. It achieves the technical effect that the mechanism can quickly and accurately reset after the external parts are removed, and the switching of the action state is clear. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the position triggering mechanism based on an optical interruptor proposed in this utility model; Figure 2 This is a diagram illustrating the position triggering mechanism based on an optical interruptor proposed in this utility model. Figure 3 This is a partial structural cross-sectional view of the position triggering mechanism based on an optical interruptor proposed in this utility model; Figure 4 This is a partial structural diagram of the position triggering mechanism based on an optical interruptor proposed in this utility model.

[0022] Legend: 1. Housing; 2. Control mechanism; 201. Trigger plate; 202. Optical interruptor; 203. Rotating shaft; 204. Pressing assembly; 2041. Return spring; 2042. Return post; 3. Cover. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Example: Please refer to Figures 1 to 4 This utility model provides a position triggering mechanism based on an optical interruptor, which aims to solve the problem that some position triggering switches in the prior art adopt a mechanical contact structure, and the physical contacts are prone to wear or poor contact during long-term use, thus affecting the reliability and service life.

[0025] like Figure 1 and Figure 2 As shown, the position triggering mechanism based on the optical interrupter includes a housing 1 and a control mechanism 2 housed inside the housing 1. The housing 1 serves as the mounting base for the entire mechanism and provides protection for the internal components. The control mechanism 2 converts external mechanical displacement signals into photoelectric signals for output. Specifically, the control mechanism 2 includes an optical interrupter 202, a rotating shaft 203, a trigger plate 201, and a pressing assembly 204. The optical interrupter 202 is fixed inside the housing 1 and has a U-shaped groove. The rotating shaft 203 is also fixed inside the housing 1 and serves as the rotation center of the trigger plate 201. The trigger plate 201 is rotatably sleeved on the rotating shaft 203, and the trigger plate 201 has a first end and a second end that are far apart from each other. The first end is adapted in size and shape to extend into or detach from the U-shaped groove of the optical interrupter 202. The pressing assembly 204, as a key structure for realizing the reset function, is located above the second end of the trigger plate 201. The internal components of component 204 include a return post 2042 and a return spring 2041. One end of the return post 2042 is used to directly abut against the second end of the trigger piece 201. The return spring 2041 is sleeved on the outer periphery of the return post 2042 and provides continuous elastic force to the return post 2042. In the default working state of the mechanism, the elastic force of the return spring 2041 presses down on the second end of the trigger piece 201 through the return post 2042. This pressure drives the trigger piece 201 to rotate around the rotating shaft 203, so that its first end is embedded in the U-shaped groove of the optical interrupter 202, thereby completely blocking the internal optical path of the optical interrupter 202. When an external part applies an upward pushing force to the second end of the trigger piece 201, the trigger piece 201 overcomes the downward pressure of the pressing component 204 and rotates in the opposite direction around the rotating shaft 203, so that its first end is disengaged from the U-shaped groove, thereby opening the internal optical path of the optical interrupter 202 and completing a trigger action.

[0026] Please refer to Figure 1 , Figure 2 and Figure 4 The optical interrupter 202, the rotating shaft 203, the trigger plate 201, and the pressing assembly 204 together constitute the control mechanism 2. As a functional assembly, the control mechanism 2 is completely housed in the space formed inside the housing 1 and is detachably connected to the housing 1 through the cover 3, thus realizing the encapsulation of the entire control mechanism 2.

[0027] In one specific embodiment, the lower part of the second end of the trigger piece 201 is provided with a contact surface for being lifted by an external force. The contact surface can be a smooth inclined surface or an arc surface to facilitate the introduction of external parts and smooth lifting, ensuring the smooth and reliable triggering action. At the same time, in order to ensure effective blocking of the light path, the material of the first end of the trigger piece 201 is preferably an opaque engineering plastic or metal, so as to ensure that it can completely block the light path when embedded in the U-shaped groove, generating a clear on / off signal.

[0028] In another specific embodiment, the return spring 2041 is configured as a compression spring, with one end abutting against the flange of the return post 2042 to provide a stable elastic force output, and the other end abutting against the inner wall of the housing 1 to provide a reverse support force through the housing 1, thereby applying a continuous pressing force to the return post 2042.

[0029] As another preferred embodiment, please refer to Figure 1 and Figure 3 Alternatively, the return spring 2041 can be configured such that one end abuts against the flange of the return post 2042, while the other end abuts against the inner wall of the cover 3. The cover 3 provides a reverse support force to the return spring 2041, and this configuration can also achieve continuous pressing of the return post 2042.

[0030] In a specific work format, such as Figure 3 As shown, under the pressure of the pressing component 204, the trigger piece 201 rotates clockwise around the rotating shaft 203, so that its first end is embedded in the U-shaped groove. Under the support force applied by the external parts, the trigger piece 201 overcomes the pressure of the pressing component 204 and rotates counterclockwise around the rotating shaft 203, so that its first end is disengaged from the U-shaped groove.

[0031] Working principle: In the initial state, the return spring 2041 in the pressing assembly 204 always provides elastic force to the outside. The elastic force is applied to the second end of the trigger piece 201 through the return post 2042, causing the trigger piece 201 to rotate clockwise around the pivot 203. Its first end is embedded and held in the U-shaped groove of the optical interrupter 202. At this time, the internal optical path of the optical interrupter 202 is blocked by the first end of the trigger piece 201, and the mechanism outputs a blocking signal. When an external part moves to a predetermined position and pushes up the contact surface of the second end of the trigger piece 201 from below, the upward pushing force overcomes the downward elastic force of the return spring 2041, and the trigger piece 201 then rotates counterclockwise around the rotating shaft 203. The rotation movement causes the first end of the trigger piece 201 to disengage from the U-shaped groove of the optical interrupter 202, the internal optical path of the optical interrupter 202 is restored to conduction, and the mechanism outputs a conduction signal, thereby realizing a complete position trigger detection. When the external parts are removed and the upward pushing force disappears, the trigger piece 201 automatically resets under the elastic force of the pressing component 204, and immediately rotates clockwise. Its first end is re-embedded in the U-shaped groove of the optical interrupter 202, and the light path is blocked again. The mechanism returns to its initial state. Throughout the process, the outer shell 1 and the cover 3 together encapsulate the control mechanism 2, protecting the internal components from external environmental interference. Through this combination of mechanical lever movement and photoelectric signal, this utility model replaces the traditional mechanical electrical contacts with non-contact optical path switching, solving the problem of low reliability caused by contact wear.

Claims

1. A position triggering mechanism based on an optical interruptor, comprising: The mechanism comprises a housing (1), a trigger plate (201), a light interrupter (202), and a rotating shaft (203). The light interrupter (202) is fixed inside the housing (1) and has a U-shaped groove. The rotating shaft (203) is fixed inside the housing (1). The trigger plate (201) is rotatably sleeved on the rotating shaft (203). The trigger plate (201) has a first end and a second end. The first end of the trigger plate (201) is adapted to extend into or detach from the U-shaped groove. The mechanism further comprises a pressing assembly (204), which is located above the second end of the trigger plate (201). The pressing assembly (204) includes a return post (2042) and a return pressure. Spring (2041), one end of the return post (2042) is used to abut against the second end of the trigger piece (201), the return spring (2041) is sleeved on the outer periphery of the return post (2042) and is used to provide elastic force to the return post (2042). Under the elastic force of the return spring (2041), the return post (2042) presses down on the second end of the trigger piece (201) to drive the first end of the trigger piece (201) to be embedded in the U-shaped groove in the default state to block the optical path of the light interrupter (202). When the second end of the trigger piece (201) is lifted by external force, its first end is disengaged from the U-shaped groove to conduct the optical path.

2. The position triggering mechanism based on an optical interruptor according to claim 1, characterized in that, The mechanism also includes a cover (3) which is detachably connected to the opening of the outer casing (1).

3. The position triggering mechanism based on an optical interruptor according to claim 2, characterized in that, The optical interrupter (202), the rotating shaft (203), the trigger plate (201), and the pressing assembly (204) together constitute the control mechanism (2), which is housed in the housing (1) and encapsulated by the cover (3).

4. The position triggering mechanism based on a light interruptor according to claim 1, characterized in that, The return spring (2041) is a compression spring, with one end abutting against the flange of the return post (2042) and the other end abutting against the inner wall of the outer shell (1).

5. The position triggering mechanism based on an optical interruptor according to claim 2, characterized in that, The return spring (2041) is a compression spring, with one end abutting against the flange of the return post (2042) and the other end abutting against the inner wall of the cover (3).

6. The position triggering mechanism based on an optical interruptor according to claim 1, characterized in that, The lower part of the second end of the trigger piece (201) is provided with a contact surface for being lifted by the external force.

7. The position triggering mechanism based on an optical interruptor according to claim 1, characterized in that, Under the pressure of the pressing component (204), the trigger piece (201) rotates clockwise around the rotating shaft (203). Under the action of the external force, the trigger piece (201) overcomes the pressure and rotates counterclockwise around the rotating shaft (203).

8. The position triggering mechanism based on an optical interruptor according to claim 1, characterized in that, The first end of the trigger piece (201) is made of opaque engineering plastic or metal to ensure effective blocking of the light path.

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