A valve limit switch

Abstract

The utility model relates to a valve limit switch, comprising a shell, a rotating shaft being rotatably connected to the shell, a dial fixedly connected to the rotating shaft being arranged in the shell, an arc-shaped adjustment groove with the rotating shaft rotation center as the center of a circle being opened on the dial, a trigger component being detachably fixedly mounted on the arc-shaped adjustment groove, the rotating shaft being rotatably connected to a limit fork on the upper side of the dial, the limit fork comprising a U-shaped fork head at one end away from the rotating shaft, the U-shaped fork head being used for limiting the trigger component inside, a fixing mechanism for fixing the position of the limit fork being arranged on the rotating shaft, the trigger component of the utility model can be infinitely adjusted, and the position is not easily offset during long-term use.

Description

Technical Field

[0001] The utility model relates to the technical field of switches, in particular to a valve limit switch. Background Art

[0002] Valve limit switches are widely used in various valve controls in the petroleum, chemical, electric power, water treatment and other industries to ensure the safe and efficient operation of process equipment. For example, they are used for emergency shut-off valves, regulating valves, stop valves, etc. to achieve remote monitoring, fault alarms and position confirmation. Its main function is to detect and indicate the actual position of the valve (open or closed).

[0003] The valve limit switch with the existing application number CN202120204142.5 is simple in structure and convenient for adjusting the trigger angle in order to enable the dial assembly with adjustable trigger angle. It includes a rotating shaft, a dial and a trigger component for triggering a micro switch, the dial is connected to the rotating shaft and can rotate with the rotating shaft, the trigger component is mounted on the dial, and the position of the trigger component on the dial is adjustable, and each adjustment position of the trigger component is located on the same circle with the rotation center of the rotating shaft as the center of the circle. The dial in its embodiment 1 is provided with an arc-shaped adjustment groove with the center of the rotating shaft as the center of the circle, which can realize the stepless adjustment of the trigger component, and the trigger component is only locked by a nut. In the case of long-term use, the position of the trigger component may be offset. In its embodiment 2, at least two mounting holes are opened on the dial, so that the position of the trigger component can be adjusted step by step, but the diversity of the adjustment angle is not as good as that of embodiment 1. In view of this, the present application proposes a valve limit switch that can make the trigger component stepless and is not easy to offset in the long-term use process. Utility Model Content

[0004] The utility model provides a valve limit switch which can perform stepless adjustment on a trigger component and is not prone to position deviation during long-term use, thereby solving the above problems existing in the prior art during use.

[0005] The technical solution of the utility model is achieved as follows: a valve limit switch comprises a shell, a rotating shaft is rotatably connected to the shell, a dial fixedly connected to the rotating shaft is arranged in the shell, an arc-shaped adjustment groove with the rotating shaft rotation center as the center of the circle is opened on the dial, a trigger component is detachably fixedly installed on the arc-shaped adjustment groove, the rotating shaft is rotatably connected to a limit fork on the upper side of the dial, the limit fork includes a U-shaped fork head at one end away from the rotating shaft, the U-shaped fork head is used to limit the trigger component inside, and a fixing mechanism for fixing the position of the limit fork is provided on the rotating shaft.

[0006] Preferably, the limit fork also includes a swivel rotatably connected to the rotating shaft and a connecting rod fixedly connected between the swivel and the U-shaped fork head, the fixing mechanism includes a limit plate integrally formed on the rotating shaft and a threaded sleeve threadedly connected to the connecting rod, the limit plate is located on the upper side of the dial, the swivel is rotatably sleeved on the rotating shaft on the upper side of the limit plate, the threaded sleeve is located on the upper side of the swivel, and the threaded sleeve is used to press the swivel against the limit plate.

[0007] Preferably, a plurality of anti-slip grooves are radially provided on both upper and lower end surfaces of the rotating ring.

[0008] Preferably, the trigger component includes a contact, a pressure block and a screw, the contact is located on the lower end surface of the dial, the pressure block is located on the upper end surface of the dial, the screw passes through the pressure block and the arc-shaped adjustment groove and is threadedly connected to the contact, and the U-shaped fork is used to abut against the outer wall of the pressure block.

[0009] Preferably, the dial is provided with a plurality of positioning teeth on one side of the arc-shaped adjustment groove, and the trigger component further comprises a toothed wheel located between the contact and the pressure block, the toothed wheel is fixed on the contact and sleeved outside the screw, and the toothed wheel is meshed with the positioning teeth.

[0010] Preferably, an anti-rotation block located in the arc-shaped adjustment groove is integrally formed on the contact.

[0011] Preferably, a mounting bracket is fixedly connected inside the shell, a micro switch is installed on the mounting bracket, two micro switches are provided and are symmetrically arranged on both sides of the rotating shaft, two trigger components are provided, the two trigger components respectively cooperate with the two micro switches, and two limit forks are provided corresponding to the two trigger components, and the two limit forks are arranged up and down.

[0012] In summary, the beneficial effects of the present invention are:

[0013] 1. Under the premise that the trigger component is detachably fixedly mounted on the arc-shaped adjustment groove, the utility model further provides a limit fork, which limits the trigger component within the arc-shaped adjustment groove through the U-shaped fork head of the limit fork, and then fixes the position of the limit fork through the fixing mechanism on the rotating shaft, thereby further strengthening the structure of the trigger component. The structure can effectively prevent the position of the trigger component from being offset during long-term use, and the trigger component can also be infinitely adjusted.

[0014] 2. The limit fork is fixed by pressing the limit plate and the threaded sleeve. The limit fork can be adjusted according to the position of the trigger component, and the adjustment is also very convenient.

[0015] 3. The setting of the anti-slip pattern can effectively prevent the swivel from rotating relative to the swivel when it is pressed by the limit plate and the threaded sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 This is a schematic diagram of the structure of the utility model after removing the shell;

[0019] Figure 3 for Figure 2 Schematic diagram of the structure after removing the mounting frame and micro switch;

[0020] Figure 4 for Figure 3 Schematic diagram of structural explosion;

[0021] Figure 5 It is a structural schematic diagram of the limit fork in the utility model.

[0022] In the figure: 1. housing; 2. rotating shaft; 21. limiting plate; 22. threaded sleeve; 3. dial; 31. arc-shaped adjustment groove; 32. positioning tooth; 4. limiting fork; 41. U-shaped fork head; 42. swivel; 43. anti-slip groove; 44. connecting rod; 5. contact; 51. pressure block; 52. screw; 53. toothed wheel; 54. anti-rotation block; 6. mounting bracket; 7. micro switch; 71. button. DETAILED DESCRIPTION

[0023] The following will be combined with the attached embodiment of the present utility model Figure 1-5 , clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] Example:

[0025] like Figures 1 to 5As shown, the utility model discloses a valve limit switch, including a shell 1, on which a rotating shaft 2 is rotatably connected, and a dial 3 fixedly connected to the rotating shaft 2 is provided in the shell 1, an arc-shaped adjustment groove 31 with the rotation center of the rotating shaft 2 as the center is opened on the dial 3, and a trigger component is detachably fixedly mounted on the arc-shaped adjustment groove 31, and in addition, the rotating shaft 2 is rotatably connected to a limit fork 4 on the upper side of the dial 3, and the limit fork 4 includes a U-shaped fork head 41 at one end away from the rotating shaft 2, and the U-shaped fork head 41 is used to limit the trigger component inside, and a fixing mechanism for fixing the position of the limit fork 4 is provided on the rotating shaft 2.

[0026] Under the premise that the trigger component is detachably fixedly mounted on the arc-shaped adjustment groove 31, the utility model further provides a limit fork 4, and the trigger component is limited inside by the U-shaped fork head 41 of the limit fork 4, and then the position of the limit fork 4 is fixed by the fixing mechanism on the rotating shaft 2, so that the structure of the trigger component can be further strengthened. This structure can effectively prevent the trigger component from positional deviation during long-term use, and the trigger component can also be infinitely adjusted.

[0027] Among them, the limit fork 4 also includes a swivel 42 rotatably connected to the rotating shaft 2 and a connecting rod 44 fixedly connected between the swivel 42 and the U-shaped fork head 41, and the fixing mechanism specifically includes a limit plate 21 integrally formed on the rotating shaft 2 and a threaded sleeve 22 threadedly connected to the connecting rod 44. The limit plate 21 is located on the upper side of the dial 3, and the swivel 42 is rotatably sleeved on the rotating shaft 2 on the upper side of the limit plate 21. The threaded sleeve 22 is located on the upper side of the swivel 42. The threaded sleeve 22 is used to press the swivel 42 onto the limit plate 21. A plurality of stripes are provided on the outer side wall of the threaded sleeve 22 to facilitate the user to rotate the threaded sleeve 22 by hand. The limit fork 4 is fixed by pressing the limit plate 21 and the threaded sleeve 22. The limit fork 4 can be adjusted according to the position of the trigger component, and the adjustment is also very convenient.

[0028] Among them, a plurality of anti-skid grooves 43 are radially provided on both upper and lower end surfaces of the rotating ring 42 . The anti-skid grooves 43 can effectively prevent the rotating ring 42 from relatively rotating when it is pressed by the limiting plate 21 and the threaded pressing sleeve 22 .

[0029] In the utility model, the trigger component includes a contact 5, a pressure block 51 and a screw 52. The contact 5 is located on the lower end surface of the dial 3, the pressure block 51 is located on the upper end surface of the dial 3, the screw 52 passes through the pressure block 51 and the arc-shaped adjustment groove 31 and is threadedly connected to the contact 5. The contact 5 can be fixed to the dial 3 by the screw 52, ​​wherein the U-shaped fork 41 is used to abut against the outer side wall of the pressure block 51.

[0030] As a preferred solution, the dial 3 of the utility model can also be provided with a plurality of positioning teeth 32 on one side of the arc-shaped adjustment groove 31, and the trigger component also includes a toothed wheel 53 located between the contact 5 and the pressure block 51, the toothed wheel 53 is fixed on the contact 5 and sleeved outside the screw 52, ​​and the toothed wheel 53 is meshed with the positioning teeth 32, so that after the contact 5 is installed in position, it is less likely to deviate from the position on the arc-shaped adjustment groove 31. In addition, an anti-rotation block 54 located in the arc-shaped adjustment groove 31 is integrally formed on the contact 5, and the provision of the anti-rotation block 54 can prevent the contact 5 from rotating around the screw 52.

[0031] In the utility model, a mounting frame 6 is fixedly connected inside the shell 1, and a micro switch 7 is installed on the mounting frame 6. Two micro switches 7 are provided and are symmetrically arranged on both sides of the rotating shaft 2, and two trigger components are provided. The two trigger components respectively cooperate with the two micro switches 7, and the buttons 71 of the two micro switches 7 are located on the arc path of the trigger component rotating with the rotating shaft 2. In addition, two limit forks 4 are also provided corresponding to the two trigger components, and the two limit forks 4 are arranged up and down.

[0032] It should also be pointed out that the terms used in the present invention, such as “front”, “rear”, “vertical”, “horizontal”, etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are only used to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention.

[0033] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A valve limit switch, comprising a housing, a rotating shaft being rotatably connected to the housing, a dial fixedly connected to the rotating shaft being arranged in the housing, an arc-shaped adjustment groove with the rotating shaft rotation center as the circle center being opened on the dial, a trigger component being detachably fixedly mounted on the arc-shaped adjustment groove, characterized in that: The rotating shaft is rotatably connected to a limit fork on the upper side of the dial, and the limit fork includes a U-shaped fork head at one end away from the rotating shaft. The U-shaped fork head is used to limit the trigger component inside, and a fixing mechanism for fixing the position of the limit fork is provided on the rotating shaft.

2. A valve limit switch according to claim 1, characterized in that: The limit fork also includes a swivel rotatably connected to the rotating shaft and a connecting rod fixedly connected between the swivel and the U-shaped fork head, the fixing mechanism includes a limit plate integrally formed on the rotating shaft and a threaded sleeve threadedly connected to the connecting rod, the limit plate is located on the upper side of the dial, the swivel rotatably sleeve is arranged on the rotating shaft on the upper side of the limit plate, the threaded sleeve is located on the upper side of the swivel, and the threaded sleeve is used to press the swivel against the limit plate.

3. A valve limit switch according to claim 2, characterized in that: The upper and lower end surfaces of the rotating ring are radially provided with a plurality of anti-skid grooves.

4. A valve limit switch according to claim 1, characterized in that: The trigger component includes a contact, a pressure block and a screw. The contact is located on the lower end surface of the dial, the pressure block is located on the upper end surface of the dial, the screw passes through the pressure block and the arc-shaped adjustment groove and is threadedly connected to the contact, and the U-shaped fork is used to abut against the outer side wall of the pressure block.

5. A valve limit switch according to claim 4, characterized in that: The dial is provided with a plurality of positioning teeth on one side of the arc-shaped adjustment groove, and the trigger component also includes a toothed wheel located between the contact and the pressure block, the toothed wheel is fixed on the contact and sleeved outside the screw, and the toothed wheel is meshed with the positioning teeth.

6. A valve limit switch according to claim 5, characterized in that: The contact is integrally formed with an anti-rotation block located in the arc-shaped adjustment groove.

7. A valve limit switch according to claim 1, characterized in that: A mounting frame is fixedly connected inside the shell, and a micro switch is installed on the mounting frame. Two micro switches are provided and are symmetrically arranged on both sides of the rotating shaft. Two trigger components are provided, and the two trigger components respectively cooperate with the two micro switches. Two limit forks are provided corresponding to the two trigger components, and the two limit forks are arranged up and down.

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