Microswitch safety mechanism

Abstract

The utility model discloses a microswitch safety mechanism which comprises a cover plate and a bottom plate which form a box body, the bottom plate is connected with two microswitches and two sleeves, one end of an ejector rod extends out of the box body, and the other end of the ejector rod can simultaneously drive the two microswitches to switch when the ejector rod moves towards the two microswitches. The mechanism has the characteristics of simple structure, simplicity and rapidness in operation, reliability in signal switching and the like.

Description

Technical Field

[0001] The utility model belongs to the technical field of electrical insurance, and in particular relates to a micro switch insurance mechanism. Background Art

[0002] Micro switches are widely used as electronic components for controlling the on / off of electrical signals. They can accurately control the on / off of electrical signals with a small actuation force and a small actuation stroke, thereby meeting specific operational purposes and improving system reliability. However, the actuation stroke range of micro switches is small, generally controlled within the range of 1 to 3 mm, and the internal structure is simple. During actuation, there is a problem of overtravel, which may damage the micro switch structure and cause the micro switch to fail. Especially when two or more micro switches need to be controlled on and off at the same time, the traditional method is to control the on / off of the micro switches by rotating the switching lever, which is prone to the above-mentioned problem of overtravel structure damage. In addition, there is a problem that the micro switches are installed in exposed spaces, which may be damaged by rain, salt spray, misoperation and external force after long-term use. Once damaged, the micro switches can generally only be disassembled and replaced, which increases equipment maintenance time. Utility Model Content

[0003] Purpose of the utility model

[0004] In order to solve the problem in the prior art that external force is required to control the switching of the micro switch, and the micro switch is prone to structural damage and failure after overtravel if the actuating force directly acting on the micro switch is too large, the utility model provides a micro switch safety mechanism.

[0005] Utility model technology solutions

[0006] A micro switch safety mechanism includes a cover plate and a bottom plate forming a box body. Two micro switches and two sleeves are connected to the bottom plate. One end of a push rod extends out of the box body. When the push rod moves toward the two micro switches, the other end of the push rod can simultaneously drive the two micro switches to switch.

[0007] Preferably, the push rod is movably arranged on the two sleeves and can move along the holes on the two sleeves. A spring is provided on the push rod and is located between the two sleeves. The spring can make the push rod tend to move in a direction away from the micro switch.

[0008] Preferably, the two micro switches are located on both sides of the other end of the push rod, and the conversion modules of the two micro switches are located on the side where the two micro switches are close to each other.

[0009] Preferably, the push rod is a smooth cylindrical shape and the other end of the push rod is conical.

[0010] Preferably, holes for leading out the wires on the micro switch are opened on both sides of the bottom plate, and the wires and the holes are blocked by an adhesive insulating object.

[0011] Preferably, the cover plate and the bottom plate can be opened or closed, and the cover plate and the bottom plate are connected by screws.

[0012] Preferably, the sleeve is mounted on the base plate by screws and nuts.

[0013] Preferably, each side edge of the bottom plate cooperates with the corresponding side edge of the cover plate through a step groove and a boss.

[0014] Preferably, the hole on the bottom plate for the push rod to extend out is clearance-matched with the push rod.

[0015] Preferably, the fitting clearance between the hole on the bottom plate through which the push rod extends and the push rod is 0.01 to 0.05 mm.

[0016] The advantages of the utility model are as follows: the mechanism has the characteristics of simple structure, easy and fast operation, reliable signal switching, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is an isometric view of a micro switch of the present utility model.

[0018] Figure 2 An isometric view of a micro switch with the cover removed.

[0019] Figure 3 The figure is a schematic diagram of the internal structure of a micro switch of the present invention.

[0020] Figure 4 The utility model is a schematic diagram of the operation of a micro switch safety mechanism.

[0021] In the figure: 1-cover, 2-screw, 3-micro switch, 4-top rod, 5-screw, 6-nut, 7-base plate, 8-spring, 9-sleeve. DETAILED DESCRIPTION

[0022] The utility model is achieved through the following technical solutions.

[0023] A micro switch safety mechanism includes a cover plate 1, a screw 2, a micro switch 3, a push rod 4, a screw 5, a nut 6, a base plate 7, a spring 8, and a sleeve 9.

[0024] The microswitch 3 is mounted within the housing formed by the base plate 7 and the cover plate 1, ensuring that it is not easily damaged by external forces. A push rod 4 is mounted on two sleeves 9 and can slide forward and backward along their axes to activate the microswitch 3. Two microswitches 3 are mounted on the left and right sides of the push rod 4. This ensures that when the push rod 4 moves backward and simultaneously pushes the microswitch 3, both microswitches 3 can reliably switch, and neither microswitches 3 will exceed their actuation range. The push rod 4 acts on the microswitch 3's switching module through its smooth cylindrical outer surface of constant diameter. Therefore, regardless of the external force applied to the push rod or the amount of backward movement, the actuation range of the microswitch 3 remains unchanged after switching, maintaining a stable state and preventing failure and structural damage to the microswitch 3 due to overtravel. A spring 8 is installed between the two sleeves 9, constantly applying a forward bias to the push rod 4, ensuring that under normal conditions, the push rod 4 will not automatically move backward and trigger the microswitch 3. The micro switch safety mechanism is installed in the device, and the push rod 4 extends from the box body. The on and off of the two micro switches 3 can be reliably controlled by simply controlling the extension and contraction of the push rod 4, thereby achieving the purpose of realizing specific operations.

[0025] The base plate 7 has a "fence" structure, with numerous screw holes at the bottom for mounting the sleeve 9 and microswitch 3, as well as three mounting holes designed for the device itself. Light holes are provided on both sides to facilitate the extraction of wires from the microswitch. After the wires are extracted, the holes can be blocked with an adhesive insulating material such as insulating tape if necessary. Step grooves of a certain height are provided on the outer edges to mate with the stepped bosses on the cover plate 1. The cross-jointing of the two facilitates the structural sealing. The front light hole is used to mount the ejector pin 4. The clearance between the light hole diameter and the outer diameter of the ejector pin 4 is controlled within a range of 0.01 to 0.05 mm, ensuring free sliding of the ejector pin 4 within the hole and providing a good seal. Three bolt holes are provided at the bottom of the base plate 7 to facilitate the installation of the microswitch safety mechanism on the device in which it is used. The above measures can maintain a relatively sealed environment between the bottom plate 7 and the cover plate 1, and provide good protection for the micro switch 3 and other components, preventing their structure and appearance from being damaged by liquids such as rain, corrosive substances such as salt spray, external forces and other factors.

[0026] The outer structure of the sleeve 9 is similar to that of the cable clamp and is used to fix the action position of the push rod 4. The sleeve 9 is mounted on the base plate by two screws and nuts.

[0027] The push rod 4 is cylindrical, and the rear end is used to drive the micro switch conversion module. A spring 8 is installed on the middle outside. External force acts on the front end of the push rod 4, and the push rod 4 overcomes the spring force and moves backward, thereby driving the micro switch 3 to switch.

[0028] The cover plate 1 has a similar appearance to the base plate 7. There are four screw holes on the cover plate 1, which is connected to the base plate 7 by four screws. When the cover plate 1 and the base plate 7 are connected to each other, a sealing structure is formed to protect the micro switch 3 and other components.

[0029] The push rod 4 extends from the box body formed by the cover plate 1 and the bottom plate 7. When external force acts on the top of the push rod 4 along the axis, the push rod 4 overcomes the elastic force generated by the spring 8 and moves backward. After moving a certain distance, the conical top of the push rod 4 passes through the two micro switch 3 conversion modules. When the cylindrical surface of the push rod 4 passes through the two micro switch 3 conversion modules, the two micro switches 3 are switched, thereby controlling the on and off of the circuit. The actuating stroke range of the two micro switches 3 is 0.95mm~1.25mm. If it exceeds 1.25mm, it belongs to the overtravel range of the micro switch 3, which is likely to cause its structure to be damaged and fail.

[0030] The diameter of the push rod 4 acting on the micro switch 3 is φ3.2mm. After the two micro switches 3 are installed on the base plate 7, the distance between the top ends of the two conversion modules is 1.1mm. Therefore, when the push rod acts on the top ends of the two micro switch conversion modules, the two conversion modules move inward by 1.05mm. Within the actuation range of the micro switch 3, the micro switch 3 can be reliably switched to control the on and off of the circuit in the equipment. The actuation direction of the push rod 4 is perpendicular to the actuation direction of the micro switch 3. When the equipment increases the external force acting on the push rod 4, it will only accelerate the on-off switching speed of the micro switch 3, and will not cause the micro switch to over-travel and cause structural damage.

[0031] In this embodiment, the elastic force of the spring 8 is 7.6N, and the weight of the push rod 4 is 0.001kg. Even when used in the aviation field, it can withstand an overload of 76g, and has a stable state and safe and reliable performance.

[0032] The above embodiments are intended only to illustrate the technical concepts and features of the present invention. Their purpose is to enable those skilled in the art to understand the contents of the present invention and implement them accordingly. They are not intended to limit the scope of protection of the present invention. All equivalent changes or modifications based on the spirit and essence of the present invention are included in the scope of protection of the present invention. The technologies, shapes, and structures not described in detail in this utility model are well known.

Claims

1. A micro switch safety mechanism, characterized in that: The invention comprises a cover plate (1) and a bottom plate (7) forming a box body. Two micro switches (3) and two sleeves (9) are connected to the bottom plate (7). One end of a push rod (4) extends out of the box body. When the push rod (4) moves toward the two micro switches (3), the other end of the push rod (4) can simultaneously drive the two micro switches (3) to switch.

2. A micro switch safety mechanism according to claim 1, characterized in that: The push rod (4) is movably arranged on the two sleeves (9) and can move along the holes on the two sleeves (9). A spring (8) is arranged on the push rod (4). The spring (8) is located between the two sleeves (9). The spring (8) can make the push rod (4) have a tendency to move in a direction away from the micro switch (3).

3. A micro switch safety mechanism according to claim 1, characterized in that: The two micro switches (3) are located on both sides of the other end of the top rod (4), and the conversion modules of the two micro switches (3) are located on the side where the two micro switches (3) are close to each other.

4. A micro switch safety mechanism according to claim 1, characterized in that: The push rod (4) is in a smooth cylindrical shape and the other end of the push rod (4) is in a conical shape.

5. A micro switch safety mechanism according to claim 1, characterized in that: Holes for leading wires on the micro switch (3) are provided on both sides of the bottom plate (7), and the wires and the holes are blocked by an adhesive insulating object.

6. A micro switch safety mechanism according to claim 2, characterized in that: The cover plate (1) and the bottom plate (7) can be opened or closed, and the cover plate (1) and the bottom plate (7) are connected by screws.

7. A micro switch safety mechanism according to claim 1, characterized in that: The sleeve (9) is mounted on the base plate (7) via screws and nuts.

8. A micro switch safety mechanism according to claim 1, characterized in that: Each side edge of the bottom plate (7) is matched with the corresponding side edge of the cover plate (1) through a step groove and a boss.

9. A micro switch safety mechanism according to claim 1, characterized in that: The hole on the bottom plate (7) through which the push rod (4) extends is clearance-matched with the push rod (4).

10. A micro switch safety mechanism according to claim 9, characterized in that: The matching clearance between the hole on the bottom plate (7) through which the push rod (4) extends and the push rod (4) is 0.01 to 0.05 mm.

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