Sealed large stroke ribbon wire micro switch

Abstract

The utility model discloses a sealed big stroke with wire formula micro switch, belongs to micro switch technical field, including the press handle of axially mobile setting in the shell, and the press handle one end is located the outside of shell as operating end, and the other end is located the inside of shell and is equipped with the first step surface of radial protruding, the press handle inside axially is provided with small spring and lower end and is equipped with the push rod of second step surface, the push rod lower end sets up in the base and passes through the inside step limit hole of base and is contacted with micro switch unit, the press handle outside is equipped with big spring and is pre -compression between the first step surface of press handle and the inner wall step surface of base, small spring is contained in the inner chamber of press handle, and is pre -compression in the upper end surface of push rod. This switch has solved the problem that the existing micro switch is damaged internal structural member because of small stroke and is easy to cause overpressure when installing and using, and has reduced the installation precision of switch to driving mechanism.

Description

Technical Field

[0001] This utility model relates to the field of micro switch technology, specifically to a sealed, large-stroke micro switch with a lead wire. Background Technology

[0002] Microswitches, also known as sensitive switches, are characterized by their sensitive operation and high stroke accuracy. Currently, microswitches typically have a small stroke, requiring high precision in installation and debugging during practical use. This makes it difficult to properly utilize the switch's overtravel, easily leading to incomplete or excessive pressure and subsequent switch malfunctions. Chinese invention patent CN116387067A discloses an ultra-large stroke, dual-redundant, hermetically sealed microswitch, including an actuator and an actuating mechanism. The actuator is a sealed actuator, and the actuating mechanism is a dual-redundant actuating mechanism, mounted at the bottom of the actuator. This invention effectively prevents contact erosion and carbon buildup caused by reactions between the switch contacts and other core components with oxygen, water vapor, oil vapor, and other organic matter in the working environment during switching. It effectively avoids functional failures caused by deformation of the actuator and elastic diaphragm, greatly improving switch reliability. Furthermore, it effectively ensures the consistency of the two circuits' operation, and the dual-redundant circuit design provides higher reliability than ordinary single-circuit hermetically sealed microswitches. However, this switch has a complex structure, is difficult to maintain, and is not suitable for use in harsh environments. Summary of the Invention

[0003] The purpose of this invention is to provide a sealed, large-stroke micro switch to solve the problem that existing micro switches are prone to overvoltage damage to internal structural components due to their small stroke during installation and use, thus reducing the installation accuracy of the switch's drive mechanism. This invention is constructed by combining a double-spring stroke-extending mechanism with a switch assembly encapsulated with wires.

[0004] The technical solution of this utility model is as follows: a sealed type large stroke micro switch with wire, including a handle that can be axially moved and disposed in the housing. One end of the handle is located outside the housing as the operating end, and the other end is located inside the housing and is provided with a radially protruding first stepped surface. A small spring and a push rod with a second stepped surface at the lower end are axially arranged in sequence inside the handle. The lower end of the push rod is disposed in the base and passes through the stepped limiting hole inside the base to contact the micro switch unit. A large spring is fitted around the outside of the handle and is pre-compressed between the first stepped surface of the handle and the inner stepped surface of the base; a small spring is housed in the inner cavity of the handle and is pre-compressed between the top of the inner cavity of the handle and the upper end face of the push rod.

[0005] Preferably, a limit block is provided at the connection between the handle and the push rod, and the lower end of the handle is fixedly connected to the limit block by a narrowing riveting method.

[0006] Preferably, the lower end of the outer casing is connected to a base via a thread, and a large spring is installed inside the base.

[0007] Preferably, the lower end of the base is connected to a base via a thread, and a micro switch unit is fixed inside the cavity of the base by epoxy resin potting.

[0008] Preferably, the pins of the micro switch unit are soldered with wires, and the connection gap between the lead-out end of the wire and the base is sealed with epoxy resin.

[0009] Preferably, an O-ring is provided between the handle and the mounting hole of the housing.

[0010] Preferably, the central axes of the handle, small spring, large spring, push rod, and micro switch unit are collinear.

[0011] Preferably, pressing the handle drives the push rod to move axially together, and the lower end of the push rod drives the micro switch unit to switch its contacts; when the push rod moves down so that its second step surface contacts the step limiting hole of the base, the movement of the push rod is blocked, and the handle continues to move down to compress the small spring in the opposite direction to obtain overtravel.

[0012] The beneficial effects of this utility model are: (1) The sealed large-stroke micro switch of this utility model has a perfect sealing structure. Dynamic sealing function can be achieved by O-ring and epoxy resin potting. It is suitable for humid environments and has higher working reliability. (2) This utility model adopts a double spring stroke-extending structure. The large spring provides the main reset force and sets the operating force. The small spring is used to absorb the overpressure stroke after the push rod is mechanically limited, so as to obtain a large compression stroke in a small axial length and achieve the purpose of stroke extension. A large compression stroke is achieved in a small-sized switch, which effectively prevents overpressure damage. (3) The switch of this utility model integrates a micro switch unit and wires, maintains the sensitivity of the switch action, and the form of the wire lead-out end facilitates electrical connection with the outside. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the specific embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a cross-sectional view of a sealed, large-stroke micro switch with a lead wire. Figure 2 This is a top view of a sealed, large-stroke micro switch with a lead wire; Figure 3This is a schematic diagram of the range extender mechanism of this utility model; Figure 4 This is a schematic diagram of the structure of the switch assembly of this utility model; Reference numerals: 1-Outer shell, 2-O-ring seal, 3-Button, 4-Small spring, 5-Large spring, 6-Limit block, 7-Base, 8-Base, 9-Micro switch unit, 10-Push rod, 11-Wire, 12-Epoxy resin adhesive fixing. Detailed Implementation

[0015] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. However, it should not be construed that the scope of the subject matter of the present invention is limited to the following embodiments. Any modifications, substitutions and alterations made based on ordinary technical knowledge and conventional means in the art without departing from the above-described technical concept of the present invention are included within the scope of the present invention.

[0016] like Figures 1 to 4 As shown, this utility model patent provides a sealed, long-stroke micro switch with a lead wire, including a stroke-extending mechanism and a switch assembly. The stroke-extending mechanism includes a handle 3, the lower end of which is fixed to a limit block 6 by a constricted riveting connection. It contains a small spring 4 and a push rod 10 internally, and a large spring 5 externally. The large spring 5 is installed in the cavity of the base 7, and its upper end is supported on the stepped surface of the handle 3. The base 7 is fixed to the outer shell 1 by a threaded connection, and an O-ring seal 2 is installed in the mating hole with the handle 3. The switch assembly includes a base 8, with a lead wire 11 soldered to the pin of the micro switch unit 9. The micro switch unit 9 is mounted on the base 8 and fixed with epoxy resin adhesive 12. The base 8 and the base 7 are fixed by a threaded connection. The stroke-extending mechanism employs a dual-spring stroke-extending structure, achieving a greater compression stroke through the reverse compression of the small spring 4, and uses an O-ring seal 2 to achieve a sealing function at the mating part of the push handle 3. The lead-out end of the wire 11 is potted with epoxy resin 12, and the housing 1 and base 7 are also potted and prevented from loosening with epoxy resin 12, thus isolating the internal cavity of the switch from the external environment and providing a sealing function. Therefore, this sealed, large-stroke, wire-guided micro switch has superior environmental adaptability and high reliability.

[0017] The working principle of this utility model is as follows: When the switch is in the free state, under the preload of the large spring 5, the push rod 10 and the micro switch unit 9 are in a non-contact state, and the micro switch maintains a circuit disconnected (or connected) state. When an external driving force is applied to the handle 3 to compress it axially, the large spring 5 is compressed, and under the preload of the small spring 4, the push rod 10 moves axially along with the handle 3 to drive the micro switch unit 9, causing contact switching and the circuit state to be connected (or disconnected), realizing the output or switching of electrical signals. At this time, if the handle 3 is pressed further, the step at the lower end of the push rod 10 is limited by the step at the mating hole of the base 7 and stops moving axially downward. The handle 3 continues to move downward, compressing the small spring 4 in the opposite direction to obtain overtravel. At this time, the micro switch unit 9 continues to remain in the pressed state. When the external driving force is released, under the rebound force of the large spring 5 and the small spring 4, the range extender automatically resets and releases the pressure on the micro switch unit 9, the circuit returns to the initial state, and one operation cycle is realized.

[0018] The sealed, large-stroke, wire-guided micro switch provided by this utility model has been described in detail above. Specific examples have been used to illustrate the structure and working principle of this utility model. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core idea of ​​this utility model. It should be noted that those skilled in the art can make various improvements and modifications to this utility model without departing from its principles, and these improvements and modifications also fall within the scope of protection of the claims of this utility model.

Claims

1. A sealed, long-stroke micro switch with a lead wire, characterized in that: Includes a handle (3) that is axially movable inside the housing (1). One end of the handle (3) is located outside the housing (1) as the operating end, and the other end is located inside the housing (1) and has a radially protruding first step surface. A small spring (4) and a push rod (10) with a second step surface at the lower end are axially arranged inside the handle (3). The lower end of the push rod (10) is located inside the base (7) and passes through the step limiting hole inside the base (7) to contact the micro switch unit (9). The handle (3) is fitted with a large spring (5) and pre-compressed between the first step surface of the handle (3) and the inner wall step surface of the base (7); the small spring (4) is housed in the inner cavity of the handle (3) and pre-compressed between the top of the inner cavity of the handle (3) and the upper end face of the push rod (10).

2. The sealed, large-stroke micro switch with lead wire according to claim 1, characterized in that: A limiting block (6) is provided at the connection between the handle (3) and the push rod (10), and the lower end of the handle (3) is fixedly connected to the limiting block (6) by means of narrowing riveting.

3. The sealed, large-stroke micro switch with lead wire according to claim 1, characterized in that: The lower end of the outer shell (1) is connected to a base (7) by a thread, and a large spring (5) is installed inside the base (7).

4. The sealed, large-stroke micro switch with lead wire according to claim 1, characterized in that: The lower end of the base (7) is connected to the base (8) by a thread, and the micro switch unit (9) is fixed in the cavity of the base (8) by epoxy resin glue (12).

5. The sealed, large-stroke micro switch with lead wire according to claim 1, characterized in that: The pins of the micro switch unit (9) are soldered with wires (11), and the connection gap between the lead-out end of the wires (11) and the base (7) is sealed with epoxy resin glue (12).

6. The sealed, large-stroke micro switch with lead wire according to claim 1, characterized in that: An O-ring (2) is provided between the handle (3) and the mounting hole of the outer casing (1).

7. The sealed, large-stroke micro switch with lead wire according to claim 1, characterized in that: The central axes of the handle (3), small spring (4), large spring (5), push rod (10) and micro switch unit (9) are collinear.

8. The sealed, large-stroke micro switch with lead wire according to claim 1, characterized in that: Pressing the handle (3) causes the push rod (10) to move axially together. The lower end of the push rod (10) drives the micro switch unit (9) to switch its contacts. When the push rod (10) moves down so that its second step surface contacts the step limiting hole of the base (7), the movement of the push rod (10) is blocked. The handle (3) continues to move down and will compress the small spring (4) in the opposite direction to obtain overtravel.

Images