A valve limit switch with adjustable trigger angle

Abstract

This utility model relates to the field of valve limit switch technology, specifically a valve limit switch with adjustable trigger angle. It includes a housing with a cover detachably connected to its top via screws. A limit mechanism is installed inside the housing. An adjusting knob is rotatably connected to the center of the top of the cover via a bearing. An adjusting mechanism is provided between the adjusting knob and the limit mechanism. This utility model, through the combined use of the adjusting knob, threaded rod, and threaded sleeve, achieves axial lifting and lowering adjustment of the spline sleeve. This allows the opening and closing cams to be switched without removing the cover, thus achieving the effect of directly adjusting the valve trigger angle from the outside. This solves the problem of existing technologies requiring disassembly of the sealing plate and internal adjustment, improving both adjustment convenience and sealing performance.

Description

Technical Field

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

[0002] Valve limit switches are field instruments used in automatic control systems to detect the valve status. They output the valve's open or closed position as a switching signal, which is received by a remote controller or sampled by a computer. After confirmation, the system executes the next step of the program.

[0003] A valve limit switch, as disclosed in authorization announcement number CN219534318U, includes an upper cover and a lower housing. A connecting shaft is located at the center of the upper and lower housings. The upper cover includes a frame, with an indicator cover above the frame. Transparent covers a and b, which can rotate relative to each other, are located within the frame. Posts a and b are respectively connected to transparent covers a and b. The switch also includes microswitches a and b located within the lower housing, and an upper cam for triggering microswitch a and a lower cam for triggering microswitch b, both mounted on the connecting shaft. The upper and lower cams have several recessed holes that match the posts a and b. The beneficial effect of this invention is that the transparent covers and posts allow operators to adjust the two internal cams without disassembling the upper cover, making operation more convenient.

[0004] Although the aforementioned patent does not require disassembling the top cover, it still involves removing the sealing plate and adjusting internally. Essentially, it still cannot directly adjust the trigger angle from the outside and cannot achieve true external direct adjustment functionality. Utility Model Content

[0005] The purpose of this invention is to provide a valve limit switch with an adjustable trigger angle to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A valve limit switch with adjustable trigger angle, including

[0008] The box body has a lid that is detachably connected to its top by screws, and the box body is equipped with a limit mechanism inside.

[0009] An adjustment knob is rotatably connected to the top center of the lid via a bearing, and an adjustment mechanism is provided between the adjustment knob and the limiting mechanism.

[0010] Preferably, the limiting mechanism includes a bracket fixedly connected to the left side inside the box and a terminal block fixedly connected to the right side inside the box. The upper and lower ends of the bracket near the terminal block are respectively fixedly connected to a valve opening micro switch and a valve closing micro switch. The valve opening micro switch and the valve closing micro switch are electrically connected to the terminal block through wires.

[0011] Preferably, the limiting mechanism further includes a connecting shaft rotatably connected to the middle of the bottom end of the box body via a bearing, and a spline shaft fixedly connected to the top of the connecting shaft along the axial direction. The spline shaft is splined with a spline sleeve, and the outside of the spline sleeve is fixedly connected from top to bottom to a first limiting cam, a second limiting cam, a first limiting cam, and a second limiting cam.

[0012] Preferably, when the limiting cam and the valve opening micro switch are on the same horizontal line, the limiting cam and the valve closing micro switch are also on the same horizontal line.

[0013] Preferably, the adjustment mechanism includes a threaded sleeve disposed in the middle of the inner side of the box cover, and vertical rods symmetrically fixedly connected to both ends of the inner side of the box cover. The bottom end of the threaded sleeve is rotatably connected to a spline sleeve through a bearing. Both ends of the middle part of the threaded sleeve are fixedly connected to bushings that slide with the vertical rods. The bottom end of the adjustment knob is fixedly connected to a threaded rod that is threadedly connected to the threaded sleeve.

[0014] Preferably, a transparent cover is fixedly connected to the front of the box cover, and two positioning rings are provided axially on the top front of the threaded sleeve. The distance between the two positioning rings is equal to the distance between the opening cam one and the opening cam two or the distance between the closing cam one and the closing cam two.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] This valve limit switch with adjustable trigger angle achieves axial lifting adjustment of the spline sleeve through the cooperation of the adjusting knob, threaded rod and threaded sleeve. This allows the opening cam and closing cam to be switched without removing the cover, thus achieving the effect of directly adjusting the valve trigger angle from the outside. This solves the problem that the existing technology still requires disassembling the sealing plate and entering the interior for adjustment, improving the convenience of adjustment and sealing performance.

[0017] This valve limit switch with adjustable trigger angle, through the cooperation of the positioning ring and the transparent cover, allows the lifting position of the spline sleeve to be directly observed and accurately positioned, achieving the effect of precise control of the cam switching position, and improving the reliability of adjustment and the convenience of operation. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall main structure of this utility model;

[0019] Figure 2 This is a schematic cross-sectional view of the overall structure of this utility model;

[0020] Figure 3 For the present utility model Figure 2 Enlarged view of point A in the middle;

[0021] Figure 4 For the present utility model Figure 2 Enlarged diagram of point B in the middle.

[0022] In the diagram: 1. Box body; 2. Box cover; 3. Adjusting knob; 4. Bracket; 5. Terminal block; 6. Valve opening micro switch; 7. Valve closing micro switch; 8. Connecting shaft; 9. Splined shaft; 10. Splined sleeve; 11. Limiting cam one; 12. Limiting cam two; 13. Limiting cam one; 14. Limiting cam two; 15. Vertical rod; 16. Bushing; 17. Threaded rod; 18. Transparent cover; 19. Positioning ring; 20. Threaded sleeve. 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] like Figure 1-4 As shown, this utility model provides a technical solution:

[0025] A valve limit switch with adjustable trigger angle includes a housing 1, the top of which is detachably connected to a cover 2 by screws. A limit mechanism is provided inside the housing 1, including a bracket 4 fixedly connected to the left side inside the housing 1 and a terminal block 5 fixedly connected to the right side inside the housing 1. A valve opening microswitch 6 and a valve closing microswitch 7 are respectively fixedly connected to the upper and lower ends of the bracket 4 near the terminal block 5. The valve opening microswitch 6 and valve closing microswitch 7 are electrically connected to the terminal block 5 via wires. The limit mechanism also includes a connecting shaft 8 rotatably connected to the middle of the bottom end of the housing 1 via bearings, and a splined shaft 9 axially fixedly connected to the top end of the connecting shaft 8. A splined sleeve 10 is splinedly connected to the outside of the splined shaft 9. From top to bottom, a first opening cam 11, a second opening cam 12, a first closing cam 13, and a second closing cam 14 are sequentially fixedly connected to the outside of the splined sleeve 10. The first opening cam 11 and the valve opening microswitch 7 are connected to each other. When the gate 6 is on the same horizontal line, the gate limiting cam 13 and the gate valve micro switch 7 are also on the same horizontal line. The adjusting knob 3 is rotatably connected to the top center of the cover 2 through a bearing. An adjusting mechanism is provided between the adjusting knob 3 and the limiting mechanism. The adjusting mechanism includes a threaded sleeve 20 located in the middle of the inner side of the cover 2, and vertical rods 15 symmetrically fixed to both ends of the inner side of the cover 2. The bottom end of the threaded sleeve 20 is rotatably connected to the spline sleeve 10 through a bearing. Both ends of the middle part of the threaded sleeve 20 are fixedly connected to the bushings 16 that slide with the vertical rods 15. The bottom end of the adjusting knob 3 is fixedly connected to the threaded rod 17 that is threaded to the threaded sleeve 20. A transparent cover 18 is fixedly connected to the front of the cover 2. Two positioning rings 19 are provided axially on the top front of the threaded sleeve 20. The distance between the two positioning rings 19 is equal to the distance between the gate limiting cam 11 and the gate limiting cam 22 or the distance between the gate limiting cam 13 and the gate limiting cam 24.

[0026] In this embodiment, the axial lifting adjustment of the spline sleeve 10 is achieved by the coordinated use of the adjusting knob 3, the threaded rod 17 and the threaded sleeve 20, so that the opening cam and the closing cam can be switched without disassembling the cover 2, thereby achieving the effect of directly adjusting the valve trigger angle from the outside. This solves the problem that the existing technology still requires disassembling the sealing plate and entering the interior for adjustment, and improves the convenience of adjustment and sealing performance.

[0027] Furthermore, by using the positioning ring 19 in conjunction with the transparent cover 18, the lifting position of the spline sleeve 10 can be directly observed and accurately positioned, achieving the effect of precisely controlling the cam switching position and improving the reliability of adjustment and ease of operation.

[0028] Working principle: When the valve rotates, the connecting shaft 8 drives the spline shaft 9 to rotate. The spline shaft 9 drives the opening limiting cam 11, the opening limiting cam 2 12, the closing limiting cam 13, and the closing limiting cam 2 14 to rotate synchronously through the spline sleeve 10. If the valve is in the open state, the protruding part of the opening limiting cam 11 or the opening limiting cam 2 12 contacts the contact of the valve opening micro switch 6 and triggers a signal, outputting a valve open signal through the terminal 5. If the valve is in the closed state, the protruding part of the closing limiting cam 13 or the closing limiting cam 2 14 contacts the contact of the valve closing micro switch 7 and triggers a signal, outputting a valve closed signal through the terminal 5. When the trigger angle needs to be adjusted, the adjustment knob 3 is rotated. The adjustment knob 3 drives the threaded sleeve 20 to move axially along the vertical rod 15 through the threaded rod 17. The threaded sleeve 20 drives the spline sleeve 10 to slide up and down along the spline shaft 9, so that the positions of the limiting cam 11 and the limiting cam 22, as well as the limiting cam 13 and the limiting cam 24 are switched. Since the cam angles of the limiting cam 11 and the limiting cam 22 are different, and the cam angles of the limiting cam 13 and the limiting cam 24 are also different, the raising and lowering of the spline sleeve 10 can change the cam of the actual trigger valve position, thereby adjusting the trigger angle of the valve.

[0029] It should be noted that the convex angle of the limiting cam 11 is set to 30 degrees, and the convex angle of the limiting cam 12 is set to 45 degrees; the convex angle of the limiting cam 13 is set to 60 degrees, and the convex angle of the limiting cam 14 is set to 90 degrees. When the spline sleeve 10 is in the upper position, the limiting cam 11 and the limiting cam 13 correspond to the valve opening microswitch 6 and the valve closing microswitch 7, respectively. At this time, the valve opening trigger angle is 30 degrees, and the closing trigger angle is 60 degrees. When the spline sleeve 10 moves down to the lower position, the limiting cam 12 and the limiting cam 14 correspond to the valve opening microswitch 6 and the valve closing microswitch 7, respectively. At this time, the valve opening trigger angle becomes 45 degrees, and the closing trigger angle becomes 90 degrees.

[0030] 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 preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A valve limit switch with adjustable trigger angle, characterized in that: include The box body (1) has a lid (2) that is detachably connected to its top by screws, and the box body (1) is provided with a limit mechanism inside; An adjustment knob (3) is rotatably connected to the top center of the cover (2) via a bearing, and an adjustment mechanism is provided between the adjustment knob (3) and the limiting mechanism.

2. The valve limit switch with adjustable trigger angle according to claim 1, characterized in that: The limiting mechanism includes a bracket (4) fixedly connected to the left side inside the box (1) and a terminal block (5) fixedly connected to the right side inside the box (1). The upper and lower ends of the bracket (4) near the terminal block (5) are respectively fixedly connected to a valve opening micro switch (6) and a valve closing micro switch (7). The valve opening micro switch (6) and the valve closing micro switch (7) are electrically connected to the terminal block (5) through wires.

3. A valve limit switch with adjustable trigger angle according to claim 2, characterized in that: The limiting mechanism also includes a connecting shaft (8) rotatably connected to the middle of the bottom end of the box (1) via a bearing, and a spline shaft (9) fixedly connected to the top of the connecting shaft (8) along the axial direction. The spline shaft (9) is connected to a spline sleeve (10) via a spline. The outside of the spline sleeve (10) is fixedly connected from top to bottom to a first limiting cam (11), a second limiting cam (12), a first limiting cam (13), and a second limiting cam (14).

4. A valve limit switch with adjustable trigger angle according to claim 3, characterized in that: When the limiting cam (11) and the valve opening micro switch (6) are on the same horizontal line, the limiting closing cam (13) and the valve closing micro switch (7) are also on the same horizontal line.

5. A valve limit switch with adjustable trigger angle according to claim 3, characterized in that: The adjustment mechanism includes a threaded sleeve (20) located in the middle of the inner side of the cover (2) and vertical rods (15) symmetrically fixedly connected to both ends of the inner side of the cover (2). The bottom end of the threaded sleeve (20) is rotatably connected to the spline sleeve (10) through a bearing. Both ends of the middle part of the threaded sleeve (20) are fixedly connected to bushings (16) that slide with the vertical rods (15). The bottom end of the adjustment knob (3) is fixedly connected to a threaded rod (17) that is threadedly connected to the threaded sleeve (20).

6. A valve limit switch with adjustable trigger angle according to claim 5, characterized in that: A transparent cover (18) is fixedly connected to the front of the box cover (2). Two positioning rings (19) are arranged axially on the top front of the threaded sleeve (20). The distance between the two positioning rings (19) is equal to the distance between the opening cam one (11) and the opening cam two (12) or the distance between the closing cam one (13) and the closing cam two (14).

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