A type of deviation switch

Abstract

This utility model relates to the field of protective switch technology, and more particularly to a belt misalignment switch. It includes a housing, with guide plates on both sides inside the housing. One side of the housing has an opening through which a slide bar passes, slidably connecting with the guide plates and the housing. A roller is mounted on the end of the slide bar protruding from the housing. A spring is provided between the slide bar and the housing to push the slide bar outwards. At least one guide plate has a notch, and a trigger plate on one side of the slide bar protrudes outwards from the notch. A proximity switch is also provided inside the housing. When the slide bar moves inwards a predetermined distance, the trigger plate activates the proximity switch. A cable outlet is also provided on one side of the housing. During installation, this utility model only requires ensuring that the edge of the belt is within the range corresponding to the roller.

Description

Technical Field

[0001] This utility model relates to the field of protection switch technology, and in particular to a deviation switch. Background Technology

[0002] A belt misalignment switch is a product used to monitor the amount of belt misalignment in a belt conveyor. It serves as a safety protection device that automatically alarms or stops the conveyor when belt misalignment occurs. Existing belt misalignment switches, as shown in patent application number 202120042931.3 entitled "A Belt Misalignment Switch," have a rotating roller connected to a rotating shaft via a rotating connecting plate. A trigger block is installed on the rotating shaft. When the belt misaligns, the edge of the belt pushes the roller to rotate around the shaft. When it rotates to a certain angle, the trigger block squeezes the fiber optic microswitch, thereby sending a signal. With this structure, the distance between the rotating shaft and the edge of the belt (the distance along the thickness direction of the belt edge) must be within a specified value during installation. Otherwise, the same degree of belt misalignment will result in different rotation angles of the rotating shaft, and as the amount of misalignment increases, the rotation angle per unit distance of misalignment decreases. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a deviation switch in response to the above-mentioned technical deficiencies.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: a deviation switch, including a housing, with guide plates provided on both sides inside the housing, an opening provided on one side of the housing, a slider passing through the opening into the housing and slidably connected to the guide plate and the housing, a roller provided at the end of the slider protruding from the housing, a spring provided between the slider and the housing to push the slider outward, a notch provided on at least one guide plate, a trigger plate provided on one side of the slider protruding outward from the notch, a proximity switch also provided inside the housing, the trigger plate will trigger the proximity switch when the slider moves inward a set distance, and a cable outlet tube is also provided on one side of the housing.

[0005] To further optimize this technical solution, a blind hole is provided at the end of the slider away from the roller, one end of the spring is inserted into the blind hole, and the other end contacts the end of the outer casing away from the opening.

[0006] To further optimize this technical solution, a guide post is provided at the end of the outer shell away from the opening, and the spring is sleeved on the guide post.

[0007] To further optimize this technical solution, foot plates are provided on both sides of the outer shell, and elongated holes are provided on the foot plates.

[0008] To further optimize this technical solution, the outer casing also includes a cover plate, which is detachably connected to the outer casing.

[0009] Compared with the prior art, the present invention has the following advantages: the outer shell is slidably connected with a slide bar, one end of the slide bar is provided with a roller, and one side of the slide bar is provided with a trigger piece for triggering the proximity switch. During installation, the length direction of the slide bar is parallel to the direction of belt deviation, so that the edge of the belt only needs to be within the range corresponding to the roller. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of a misalignment switch.

[0011] In the diagram: 1. Housing; 11. Guide plate; 12. Foot plate; 13. Outlet pipe; 14. Guide post; 2. Spring; 3. Sliding bar; 31. Trigger plate; 4. Cover plate; 5. Proximity switch. Detailed Implementation

[0012] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this utility model. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of this utility model.

[0013] Detailed implementation method: combined with Figure 1 As shown, a belt misalignment switch includes a housing 1, which is rectangular in shape. Guide plates 11 are provided on both sides of the interior of the housing 1. An opening is provided on one side of the housing 1, located between the two guide plates 11. A slider 3 passes through this opening into the housing 1 and slides in connection with the guide plates 11 and the upper and lower sides of the inner wall of the housing 1. A roller is provided at the end of the slider 3 protruding from the housing 1, and the roller interacts with the edge of the belt. A spring 2 is provided between the slider 3 and the housing 1 to push the slider 3 outward. At least one guide plate 11 has a notch, the notch extending parallel to the length direction of the slider 3. A trigger plate 31 is provided on one side of the slider 3, extending outward from the notch. When the trigger plate 31 contacts the end of the notch near the roller, the slider 3 cannot extend further outward. A proximity switch 5 is also provided inside the housing 1. When the slider 3 moves inward a set distance, the trigger plate 31 will trigger the proximity switch 5. A wiring conduit 13 is also provided on one side of the housing 1 for wiring.

[0014] Furthermore, a blind hole is provided at the end of the slider 3 away from the roller. One end of the spring 2 is inserted into the blind hole, and the other end contacts the end of the outer casing 1 away from the opening. The blind hole is made as deep as possible so that the spring 2 is as long as possible, thereby reducing the force change when the spring 2 is compressed to a certain length.

[0015] Furthermore, a guide post 14 is provided at the end of the outer shell 1 away from the opening, and the spring 2 is sleeved on the guide post 14, so that the spring 2 is not easily bent when compressed.

[0016] Furthermore, foot plates 12 are provided on both sides of the outer casing 1, and elongated holes are provided on the foot plates 12 to facilitate the installation of this deviation switch.

[0017] Furthermore, the outer casing 1 also includes a cover plate 4, which is detachably connected to the outer casing 1 and forms the top wall of the outer casing 1.

[0018] When installing this device, the length direction of the slide bar 3 is perpendicular to the length direction of the belt, and the length direction of the slide bar 3 is parallel to the edge of the belt in the width direction. The axis of the roller is perpendicular to the edge of the belt in the width direction (parallel to the thickness direction of the edge), so that the belt deviation direction is parallel to the movement direction of the slide bar 3. The edge of the belt can be within the range corresponding to the roller (unlike the prior art, which requires alignment with a certain position on the length of the roller so that the distance between the shaft and the edge of the belt in the thickness is a specified value. Of course, in the prior art, the distance between the axis of the roller and the edge of the belt also needs to be a specified value. This application is the same as the prior art, where the distance between the axis of the roller and the edge of the belt is a specified value). When the belt deviates, the edge of the belt contacts the roller, pushing the slide bar 3 to retract into the housing 1. When the trigger plate 31 moves to the position of the proximity switch 5, it will trigger the proximity switch 5. At this time, the belt may not immediately return to the correct position and may continue to deviate. In this case, the trigger plate 31 can move past the proximity switch 5 (the proximity switch 5 does not block the movement path of the trigger plate 31) to continue moving, so as to prevent the belt deviation switch from being damaged by excessive force. The number of proximity switches 5 can be one or two. When there is one, it is a primary belt misalignment switch; when there are two, it is a secondary belt misalignment switch. Since the belt misalignment direction is parallel to the movement direction of the slider 3, there is no situation where the movement increment of the slider 3 decreases as the misalignment amount increases.

Claims

1. A misalignment switch, comprising a housing (1), characterized in that: Guide plates (11) are provided on both sides inside the housing (1). An opening is provided on one side of the housing (1). A slider (3) passes through the opening into the housing (1) and slides in connection with the guide plate (11) and the housing (1). A roller is provided at the end of the slider (3) that protrudes from the housing (1). A spring (2) that can push the slider (3) outward is provided between the slider (3) and the housing (1). At least one guide plate (11) is provided with a notch. A trigger plate (31) provided on one side of the slider (3) protrudes outward from the notch. A proximity switch (5) is also provided inside the housing (1). When the slider (3) moves inward by a set distance, the trigger plate (31) will trigger the proximity switch (5). A cable outlet tube (13) is also provided on one side of the housing (1).

2. The belt misalignment switch according to claim 1, characterized in that: The slider (3) has a blind hole at the end away from the roller. One end of the spring (2) is inserted into the blind hole, and the other end is in contact with the end of the outer shell (1) away from the opening.

3. A belt misalignment switch according to claim 2, characterized in that: The outer shell (1) is provided with a guide post (14) at the end away from the opening, and the spring (2) is sleeved on the guide post (14).

4. A belt misalignment switch according to claim 1, characterized in that: Both sides of the outer shell (1) are provided with foot plates (12), and the foot plates (12) are provided with elongated holes.

5. A belt misalignment switch according to any one of claims 1-4, characterized in that: The outer casing (1) also includes a cover plate (4), which is detachably connected to the outer casing (1).

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