Valve limit switch

Abstract

The utility model discloses a valve limit switch which comprises a valve limit switch body, a cavity is formed in the upper portion of the valve limit switch body, a movable plate is connected to the inner wall of the top of the cavity formed in the upper portion of the valve limit switch body in a sliding mode, and a first extrusion plate is welded to the surface of the bottom of the movable plate. A first pressing rod penetrating through and extending to the exterior of the valve limiting switch body is welded to one side of the first extrusion plate, a groove is formed in the inner wall of one side of a cavity formed in the upper portion of the valve limiting switch body, and a limiting block is slidably connected into the groove; a second extrusion block is arranged at a groove formed in the side, provided with the cavity, of the upper portion of the valve limiting switch body. According to the valve limit switch, the pressing rod, the extrusion plate, the limit block and the like are arranged, so that the purpose of disconnecting a circuit of the valve limit switch body can be achieved, and the safety of an operator during maintenance or equipment replacement is ensured.

Description

Technical Field

[0001] This utility model relates to the field of valve limit switch technology, specifically a valve limit switch. Background Technology

[0002] Valve limit switches are field instruments used in automatic control systems to detect the valve status. They output a switch signal indicating the valve's open or closed position, which is received by a remote controller or sampled by a computer. After confirmation, the system executes the next step. This product can also be used as an important valve interlock protection and remote alarm indication in an automatic control system.

[0003] Traditional valve limit switches lack corresponding circuit-breaking structures to ensure safety. For example, improper adjustment of the valve limit switch may lead to misunderstandings by operators. During maintenance or equipment replacement, inaccurate valve limit switch positions may cause operators to mistakenly believe that the valve is closed or partially closed, increasing the risk of injury and potentially causing physical harm to the operator. To address these issues, we propose a valve limit switch. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a valve limit switch to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a valve limit switch, comprising a valve limit switch body, an upper cavity provided in the upper part of the valve limit switch body, a movable plate slidably connected to the top inner wall of the cavity in the upper part of the valve limit switch body, a first extrusion plate welded to the bottom surface of the movable plate, a first pressing rod welded to one side of the first extrusion plate and extending through and to the outside of the valve limit switch body, a groove provided on one side inner wall of the cavity in the upper part of the valve limit switch body, and a limit block slidably connected in the groove, a second extrusion block provided at the groove on one side of the cavity in the upper part of the valve limit switch body, a second pressing rod welded to one side of the second extrusion block and extending through and to the outside of the valve limit switch body, a push rod provided on the valve limit switch body, and a first rotating roller installed on the outer ring of the push rod located inside the cavity in the valve limit switch body.

[0006] As a preferred technical solution of this utility model, a guide rod penetrating the movable plate is installed on the side of the inner front wall and the inner back wall of the cavity opened on the upper part of the valve limit switch body that are close to each other. A third spring surrounding the outer ring of the guide rod is installed on the side of the movable plate and the inner back wall of the cavity opened on the upper part of the valve limit switch body that are close to each other.

[0007] As a preferred technical solution of this utility model, a first pressing plate is welded to one end of the first pressing rod located outside the valve limit switch body, and a second spring is installed on the side of the first pressing plate and the valve limit switch body located close to each other on the front, surrounding the outer ring of the first pressing rod.

[0008] As a preferred embodiment of this utility model, the bottom of the first extrusion plate is inclined, and a limiting groove is formed on one side of the first extrusion plate.

[0009] As a preferred technical solution of this utility model, one side of the limiting block is inclined, and the limiting block matches the limiting groove opened on one side of the first extrusion plate. A fourth spring is installed on the side of the inner wall of the groove opened in the cavity on the upper part of the valve limit switch body that is close to each other.

[0010] As a preferred technical solution of this utility model, a through hole is opened on the limiting block along the horizontal direction, and a second rotating roller is rotatably connected to the side of the top inner wall and the bottom inner wall of the through hole that are close to each other.

[0011] As a preferred technical solution of this utility model, one side of the second pressing block is inclined, and a second pressing plate is welded to one end of the second pressing rod located outside the valve limit switch body. A first spring is installed on the side of the second pressing plate that is close to the front of the valve limit switch body.

[0012] Compared with the prior art, this utility model provides a valve limit switch, which has the following advantages:

[0013] This valve limit switch, by comprising a pressing rod, a pressing plate, and a limiting block, allows the first pressing plate to be pressed. The first pressing rod then moves the first pressing plate, which in turn squeezes the first rotating roller on the push rod, causing the push rod to move downwards. At this time, the inclined side of the limiting block, under the action of a fourth spring, can be inserted into the limiting groove opened in the first pressing plate, thereby limiting the first pressing plate and preventing it from resetting. This also disconnects the circuit of the valve limit switch body, ensuring the safety of operators when performing maintenance or equipment replacement. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0015] Figure 2 This is a schematic cross-sectional view of the upper part of the valve limit switch of this utility model;

[0016] Figure 3 This is a schematic diagram of the working principle structure of the valve limit switch of this utility model, shown in cross-section at the top.

[0017] Figure 4 This is a side view of the first extrusion plate of this utility model;

[0018] Figure 5 This is a side view of the second extrusion plate of this utility model;

[0019] Figure 6 This is a schematic diagram of the limiting block structure of this utility model.

[0020] Reference numerals in the attached drawings: 1. Valve limit switch body; 2. First spring; 3. First pressing rod; 4. First pressing plate; 5. Second spring; 6. Second pressing plate; 7. Push rod; 8. Second pressing rod; 9. Third spring; 10. Limiting block; 11. Fourth spring; 12. First rotating roller; 13. Moving plate; 14. Guide rod; 15. First extrusion plate; 16. Second extrusion block; 17. Second rotating roller. Detailed Implementation

[0021] 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.

[0022] Please see Figures 1-6 In this embodiment: a valve limit switch includes a valve limit switch body 1. A cavity is provided in the upper part of the valve limit switch body 1. A movable plate 13 is slidably connected to the top inner wall of the cavity in the upper part of the valve limit switch body 1. A first pressing plate 15 is welded to the bottom surface of the movable plate 13. A first pressing rod 3, penetrating and extending to the outside of the valve limit switch body 1, is welded to one side of the first pressing plate 15. When the first pressing rod 3 moves, it can drive the first pressing plate 15 to move. A groove is provided on one inner wall of the cavity in the upper part of the valve limit switch body 1, and a limit block 10 is slidably connected in the groove, which can control the first... The extrusion plate 15 limits the movement of the valve limit switch body 1. A second extrusion block 16 is provided in the groove on one side of the cavity on the upper part of the valve limit switch body 1. A second pressing rod 8 is welded to one side of the second extrusion block 16, which penetrates and extends to the outside of the valve limit switch body 1. When the second pressing rod 8 moves, it can drive the second extrusion block 16 to move. A push rod 7 is provided on the valve limit switch body 1. A first rotating roller 12 is installed on the outer ring of the push rod 7 located inside the cavity of the valve limit switch body 1. The first extrusion plate 15 can extrude the first rotating roller 12, causing the first rotating roller 12 to move downward, which in turn causes the push rod 7 to move downward.

[0023] In this embodiment, a guide rod 14 is installed on the side of the inner front wall and the inner back wall of the cavity opened on the upper part of the valve limit switch body 1, which are close to each other, and serves as a guide. A third spring 9 is installed on the side of the inner back wall of the cavity opened on the upper part of the valve limit switch body 1, which are close to each other, and surrounds the guide rod 14. The third spring 9 can squeeze the moving plate 13. A first pressing rod 3 is welded to a first pressing plate 4 at one end outside the valve limit switch body 1. Pressing the first pressing plate 4 can move the first pressing rod 3. A second spring 5 is installed on the side of the first pressing plate 4 and the valve limit switch body 1, which are close to each other on the front, and surrounds the first pressing rod 3, which can squeeze the first pressing plate 4. The bottom of the first pressing plate 15 is inclined, so that when the first rotating roller 12 is squeezed, the first rotating roller 12 moves downward. A limit groove is opened on one side of the first pressing plate 15, and one side of the limit block 10 is inclined. The limit block 10 and the first pressing plate 15 are inclined. The limiting groove on one side of the extrusion plate 15 matches, allowing the inclined side of the limiting block 10 to be easily inserted into the limiting groove on the first extrusion plate 15. A fourth spring 11 is installed on the inner wall of one side of the groove in the cavity on the upper part of the valve limit switch body 1, which is close to each other, to compress the limiting block 10. A through hole is opened on the limiting block 10 in the horizontal direction, and a second rotating roller 17 is rotatably connected to the inner wall of the top and bottom of the through hole that is close to each other. One side of the second extrusion block 16 is inclined, which allows the second rotating roller 17 to move when the second extrusion block 16 extrudes the second rotating roller 17. The second pressing rod 8 has a second pressing plate 6 welded to one end outside the valve limit switch body 1. Pressing the second pressing plate 6 can move the second pressing rod 8. The side of the second pressing plate 6 that is close to the front of the valve limit switch body 1 is equipped with a first spring 2 that surrounds the outer ring of the second pressing rod 8, which can extrude the second pressing plate 6.

[0024] The working principle and usage process of this utility model are as follows: When the equipment needs to be repaired or maintained, the circuit of the valve limit switch body 1 can be disconnected, and the following operations can be performed: First, the first pressing plate 4 can be pressed, which can drive the first pressing rod 3 to move the first pressing plate 15. At this time, the first pressing plate 15 can squeeze the first rotating roller 12 on the push rod 7, thereby causing the push rod 7 to move downward. When the first pressing plate 15 squeezes the first rotating roller 12 and causes the push rod 7 to move downward, the inclined side of the limiting block 10 can be inserted into the limiting groove opened in the first pressing plate 15 under the action of the fourth spring 11, thereby limiting the first pressing plate 15. The purpose is to prevent the first pressing plate 15 from resetting, thereby disconnecting the circuit of the valve limit switch body 1 and ensuring the safety of the operator when performing maintenance or equipment replacement. After the operator has completed the maintenance or equipment replacement, the second pressing plate 6 can be pressed, which can drive the second pressing block 16 to move through the second pressing rod 8. The second pressing block 16 can also press the second rotating roller 17 on the limit block 10, thereby causing the limit block 10 to move and move out of the limit groove opened on the first pressing plate 15. At this time, the first pressing plate 15 can be reset under the action of the second spring 5 and the third spring 9, restoring the function of the valve limit switch body 1.

[0025] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A valve limit switch, comprising a valve limit switch body (1), characterized in that: The upper part of the valve limit switch body (1) is provided with a cavity. A movable plate (13) is slidably connected to the top inner wall of the cavity in the upper part of the valve limit switch body (1). A first pressing plate (15) is welded to the bottom surface of the movable plate (13). A first pressing rod (3) is welded to one side of the first pressing plate (15) and extends through and to the outside of the valve limit switch body (1). A groove is provided on one side inner wall of the cavity in the upper part of the valve limit switch body (1). The valve limit switch body (1) is equipped with an inner sliding connection limit block (10). A second pressing block (16) is provided at the groove on one side of the cavity on the upper part of the valve limit switch body (1). A second pressing rod (8) is welded to one side of the second pressing block (16) and extends through and to the outside of the valve limit switch body (1). A push rod (7) is provided on the valve limit switch body (1). A first rotating roller (12) is installed on the outer ring of the push rod (7) located inside the cavity of the valve limit switch body (1).

2. The valve limit switch according to claim 1, characterized in that: A guide rod (14) that penetrates the moving plate (13) is installed on the side of the cavity opened on the upper part of the valve limit switch body (1) where the front inner wall and the back inner wall are close to each other. A third spring (9) that surrounds the outer ring of the guide rod (14) is installed on the side of the moving plate (13) and the back inner wall of the cavity opened on the upper part of the valve limit switch body (1) where they are close to each other.

3. A valve limit switch according to claim 1, characterized in that: The first pressing rod (3) is welded to a first pressing plate (4) at one end outside the valve limit switch body (1). The first pressing plate (4) and the valve limit switch body (1) are mounted on the side of the front facing each other, and a second spring (5) is installed around the outer ring of the first pressing rod (3).

4. A valve limit switch according to claim 1, characterized in that: The bottom of the first extrusion plate (15) is inclined, and a limiting groove is provided on one side of the first extrusion plate (15).

5. A valve limit switch according to claim 1, characterized in that: The limiting block (10) is inclined on one side, and the limiting block (10) matches the limiting groove opened on one side of the first extrusion plate (15). A fourth spring (11) is installed on the inner wall of the groove opened on one side of the cavity opened on the upper part of the valve limit switch body (1).

6. A valve limit switch according to claim 1, characterized in that: The limiting block (10) has a through hole in the horizontal direction, and a second rotating roller (17) is rotatably connected to the side of the top inner wall and the bottom inner wall of the through hole that are close to each other.

7. A valve limit switch according to claim 1, characterized in that: The second pressing block (16) is inclined on one side. The second pressing rod (8) is located at one end outside the valve limit switch body (1) and a second pressing plate (6) is welded thereon. The second pressing plate (6) and the valve limit switch body (1) are close to each other on the side where the front of the valve limit switch body (1) are close to each other and a first spring (2) is installed around the outer ring of the second pressing rod (8).

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