Elastic contact mechanical contact valve position switch

Abstract

The utility model relates to valve position detection technical field discloses a kind of elastic contact type mechanical contact valve position switch, including closed cavity, inside being provided with adjustable circuit board of position, circuit board is along closed cavity inner wall sliding;Circuit board is provided with lower valve position mechanical switch and upper valve position mechanical switch;Connecting nut, with closed cavity fixed connection;Feedback rod, with connecting nut connection, between two it is provided with sealing structure;Feedback rod one end extends to closed cavity inside, and is equipped with the contact component with self-locking and easy release function, other end is provided with contact head, contact head top leans cylinder piston rod end face, feedback rod outer periphery is provided with reset spring, provides continuous reset elastic force;Contact component reciprocates with feedback rod, triggers lower valve position mechanical switch or upper valve position mechanical switch output valve position signal.The utility model is connected by using reset spring to realize elasticity, can install the utility model with cylinder quickly, realize the effect of "blind screwing".

Description

Technical Field

[0001] This utility model relates to the field of valve position detection technology, specifically to a flexible contact mechanical contact valve position switch for linear pneumatic control valves. Background Technology

[0002] Linear-stroke pneumatic control valves mainly refer to pneumatic angle valves, pneumatic gate valves, pneumatic diaphragm valves, pneumatic linear-stroke butterfly valves, and other pneumatic linear-stroke valves. With the increasing demands for automated closed-loop control, the control system needs to know the precise position of the valve—whether it is in the "closed" or "open" position. Valve position switches are structures used to detect the valve position and can provide feedback to the control system regarding the current valve position.

[0003] The position feedback of a linear-stroke valve depends on both the valve's stroke and the initial valve position relative to the mounting surface. Even valves with the same stroke will have different initial positions. Even valves of the same specification and model will have different initial positions and strokes due to accumulated manufacturing errors. Therefore, valve position switches need to be set with initial position settings for each valve.

[0004] Linear-stroke valves include electronic valve position switches and mechanical valve position switches. Mechanical valve position switches require adjustment of the position of the built-in mechanical switch relative to the contact point that moves with the valve position.

[0005] Existing mechanical valve position switches are all fixedly connected to the valve cylinder piston rod by locking the internal or external thread of the valve position feedback rod end with the thread. The contacts on the feedback rod can be moved and adjusted, or the contacts of the feedback rod are fixed and adjusted by two mechanical switches.

[0006] The drawback of existing mechanical position switches is that after the feedback rod and piston rod are fixedly locked together, the movement axis of the feedback rod will follow the piston rod. Due to the cumulative error of multiple layers, the misalignment caused by the feedback rod and the feedback rod in the position switch base will easily wear down, causing the seal to fail, and thus the entire position switch will fail.

[0007] To avoid the above-mentioned drawbacks, some feedback rods are designed as two sections connected by a movable hinge in the middle. This structure not only increases the installation difficulty when locking the feedback rod with the cylinder piston rod, but also this hinge structure cannot move to the sealed position between the feedback rod and the position switch base, which significantly limits its adaptability. In existing position switches where the feedback rod contacts can move, the positions of the two mechanical switches are fixed. This requires the distance between the mechanical switches to be perfectly matched with the valve stroke, which significantly limits the adaptability. Utility Model Content

[0008] To solve the above-mentioned technical problems, the purpose of this utility model is to provide a flexible contact mechanical contact valve position switch that is easy to install, has reliable sealing, and is flexible in adjustment.

[0009] To achieve the above technical objectives, this utility model provides the following technical solution: a flexible contact mechanical contact valve position switch, comprising, The enclosed cavity contains an adjustable circuit board that slides along the inner wall of the cavity. The circuit board has a lower valve position mechanical switch and an upper valve position mechanical switch. Connecting nuts are used to securely connect the device to the enclosed cavity. The feedback rod is connected to the connecting nut. One end extends into the closed cavity and is equipped with a contact assembly with self-locking and easy-release functions. The other end is provided with a contact head, which abuts against the end face of the cylinder piston rod. A return spring is provided on the outer periphery of the feedback rod to provide continuous return force. The contact assembly reciprocates with the feedback rod, triggering the lower or upper valve position mechanical switch to output a valve position signal.

[0010] According to this utility model, the enclosed cavity further includes a base and a shell connected thereto, which together form the enclosed cavity.

[0011] According to this utility model, the circuit board is further elastically connected to the base via a circuit board spring.

[0012] According to this utility model, a sealing ring is further provided between the feedback rod and the connecting nut to seal the feedback rod and prevent compressed air from entering the enclosed cavity.

[0013] According to this utility model, the reset spring is further fitted around the outer periphery of the feedback rod, with one end abutting against the connecting nut and the other end extending downward to be fixed to the stepped surface of the contact head.

[0014] According to this utility model, the connecting nut can be any one of internal thread, external thread, smooth cylinder, or smooth hole.

[0015] According to this utility model, the contact assembly is a flexible snap-lock structure that can be released and adjusted by pressing, and automatically locked onto the feedback rod after being released.

[0016] According to this utility model, after the position of the circuit board is adjusted, it is locked onto the base by means of bolt tightening, buckle fixing or pin positioning.

[0017] According to this utility model, the outer shell and the base are made of non-metallic or metallic materials.

[0018] According to this utility model, both the lower valve position mechanical switch and the upper valve position mechanical switch are configured to selectively output normally open or normally closed signals.

[0019] Compared with the prior art, the beneficial effects of this utility model are as follows: This invention achieves elastic connection by using a return spring, which allows for quick installation of the invention with the cylinder, achieving a "blind tightening" effect.

[0020] This invention uses an elastic connection to keep the feedback rod and the connecting nut coaxial and in their initial state, which greatly improves the service life of the sealing ring and makes the position switch less prone to sealing failure within its designed lifespan.

[0021] This invention utilizes a contact assembly with self-locking and easy-release functions, allowing for convenient adjustment of the position on the feedback rod to set the initial valve position or adjust the valve position setting.

[0022] With the help of a circuit board spring, the position of the adjustable circuit board can be quickly adjusted to the open and closed positions of the two valve mechanical switches, or the position of the circuit board can be adjusted simultaneously as needed to adjust the position of the two valve mechanical switches. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the elastic contact mechanical contact valve position switch of this utility model.

[0024] In the attached diagram, 1-contact head, 2-feedback rod, 3-reset spring, 4-connecting nut, 5-sealing ring, 6-base, 7-lower valve position mechanical switch, 8-circuit board spring, 9-circuit board, 10-contact assembly, 11-upper valve position mechanical switch, 12-housing. Detailed Implementation

[0025] 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.

[0026] like Figure 1As shown, this application embodiment provides a resilient contact mechanical contact valve position switch, including a base 6 and a housing 12 fixedly connected to form a closed cavity to protect internal components. A mounting hole is provided on the side of the base 6 away from the housing 12, and a connecting nut 4 is installed in the mounting hole and is used to connect to the top interface of the pneumatic valve cylinder. A feedback rod 2 coaxially passes through the connecting nut 4, with one end located in the closed cavity formed by the base 6 and the housing 12, and a contact assembly 10 is provided at this end. The contact head 1 at the other end abuts against the end face of the cylinder piston rod. A reset spring 3 is fitted on the outer periphery of the feedback rod 2, with one end abutting against the connecting nut 4 and the other end extending downward to be fixed to the stepped surface of the contact head 1, providing continuous reset elastic force. The outer shell 12 and the base 6 are not limited to non-metallic materials and can also be made of metallic materials; the connecting nut 4 can be internal or external thread, smooth cylinder or smooth hole, depending on the mutual mating relationship; the contact assembly 10 has self-locking and easy-release functions, and can be conveniently adjusted to set the valve position. It preferably adopts an elastic snap-lock structure, which can be released and adjusted by pressing, and automatically locked on the feedback rod 2 after being released.

[0027] An adjustable circuit board 9 is housed within the enclosed cavity formed by the base 6 and the outer casing 12. The circuit board 9 is used to fix the mechanical position switches and the wiring terminals for output signals, as well as to output light signals. The circuit board 9 is elastically connected to the base 6 via a circuit board spring 8. The circuit board 9 slides against the base 6 via grooves on both sides. The circuit board spring 8 is a tension spring to ensure the stability of the circuit board 9 during adjustment. After adjustment, the circuit board 9 is locked onto the base 6 using locking bolts. The circuit board 9 also has a lower valve position mechanical switch 7 and an upper valve position mechanical switch 11. The contact assembly 10 reciprocates with the feedback rod 2, triggering either the lower valve position mechanical switch 7 or the upper valve position mechanical switch 11 to output a valve position signal. Both the lower valve position mechanical switch 7 and the upper valve position mechanical switch 11 are microswitches, fixed to the circuit board 9 by soldering, with their signal output terminals extending to the outside of the outer casing 12 for easy wiring. During operation, the reciprocating motion of the cylinder piston rod pushes the feedback rod 2 to extend and retract, which in turn drives the contact assembly 10 to trigger the lower valve position mechanical switch 7 or the upper valve position mechanical switch 11, outputting the corresponding open or closed signals. The signal output form can be selected as normally open or normally closed by the wiring method.

[0028] In this embodiment, a sealing ring 5 is provided between the feedback rod 2 and the connecting nut 4 to seal the feedback rod 2 and prevent compressed air from entering the position switch, that is, the closed cavity formed by the base 6 and the outer shell 12.

[0029] The working principle of this utility model is as follows: The position switch is connected to the interface at the top of the pneumatic valve cylinder via the connecting nut 4; the contact head 1 presses against the end face of the cylinder piston rod. When the piston of the cylinder moves towards the position switch, the piston rod pushes the feedback rod 2 back into the position switch. When the piston of the cylinder moves away from the position switch, the feedback rod return spring 3 pushes the feedback rod 2 to reset and press firmly against the end face of the cylinder piston rod. This reciprocating cycle will drive the contact assembly 10 to disengage from the lower valve position mechanical switch 7, touch the upper valve position mechanical switch 11, and then touch the lower valve position mechanical switch 7 again. The lower valve position mechanical feedback switch 7 and the upper valve position mechanical switch 11 will independently output open and close signals during this process. Each switch can output normally open or normally closed signals, depending on the wiring method.

[0030] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. An elastic contact mechanical contact valve position switch, characterized by, The utility model relates to a valve positioner, comprising, a closed cavity with an adjustable circuit board inside, the circuit board slides along the inner wall of the closed cavity; the circuit board is provided with a lower valve position mechanical switch and an upper valve position mechanical switch; a connecting nut fixedly connected with the closed cavity; a feedback rod connected with the connecting nut, and a sealing structure is arranged between the two; one end of the feedback rod extends into the closed cavity and is provided with a contact assembly with self-locking and easy release function, and the other end is provided with a contact head which abuts against the end face of the cylinder piston rod; a reset spring is arranged on the outer periphery of the feedback rod to provide continuous reset elastic force; the contact assembly reciprocates with the feedback rod to trigger the lower valve position mechanical switch or the upper valve position mechanical switch to output the valve position signal.

2. The resilient contact mechanical contact valve position switch of claim 1 wherein, The closed cavity comprises a base and a shell connected with the base to form the closed cavity.

3. The resilient contact mechanical contact valve position switch of claim 2, wherein, The circuit board is elastically connected with the base through a circuit board spring.

4. The resilient contact mechanical contact valve position switch of claim 1 wherein, The sealing structure is a sealing ring arranged between the feedback rod and the connecting nut to seal the feedback rod and prevent compressed air from entering the closed cavity.

5. The resilient contact mechanical contact valve position switch of claim 1 wherein, The reset spring is sleeved on the outer periphery of the feedback rod, one end of the reset spring abuts against the connecting nut, and the other end extends downward to be fixed to the stepped surface of the contact head.

6. The resilient contact mechanical contact valve position switch of claim 1 wherein, The connecting nut can be any one of internal thread, external thread, smooth cylinder or smooth hole.

7. The resilient contact mechanical contact valve position switch of claim 1 wherein, The contact assembly is a elastic buckle type self-locking structure, which can be adjusted by pressing and released, and is automatically locked on the feedback rod after being released.

8. The resilient contact mechanical contact valve position switch of claim 3, wherein, After the position of the circuit board is adjusted, the circuit board is locked on the base by means of bolt locking, buckle fixing or pin positioning.

9. The resilient contact mechanical contact valve position switch of claim 2 wherein, The material of the shell and the base is non-metallic material or metal material.

10. The resilient contact mechanical contact valve position switch of claim 1 wherein, The lower valve position mechanical switch and the upper valve position mechanical switch are configured to select output of normally open signal or normally closed signal.

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