CN216719787U

CN216719787U - Micro switch

Info

Publication number: CN216719787U
Application number: CN202122600885.7U
Authority: CN
Inventors: 刘孝恩; 陈颈松; 唐光明; 郑靠明
Original assignee: Hunan Changgao Electrical Equipment Co ltd
Current assignee: Hunan Changgao Electrical Equipment Co ltd
Priority date: 2021-10-27
Filing date: 2021-10-27
Publication date: 2022-06-10
Anticipated expiration: 2031-10-27

Abstract

The utility model discloses a microswitch, which comprises an upper shell and a lower shell, wherein a cavity is formed by enclosing the upper shell and the lower shell, and a contact working assembly is arranged in the cavity; the contact device comprises a contact working assembly and an upper shell, and is characterized in that a mounting hole is formed in the upper shell, a drum membrane assembly is mounted on the mounting hole, a transmission assembly is mounted on the outer side of the drum membrane assembly, and a limiting assembly is arranged between the drum membrane assembly and a pressing elastic sheet in the contact working assembly and used for limiting the drum membrane assembly and the pressing elastic sheet. The utility model has the advantages of simple structure, improvement of the working reliability of the switch, improvement of the protection grade and the like.

Description

Micro switch

Technical Field

The utility model mainly relates to the technical field of switches, in particular to a microswitch.

Background

The microswitch is also called a limit switch, and is characterized in that external mechanical force acts on an action reed through a transmission element (such as a press pin, a button, a lever, a roller and the like), and when the action reed is displaced to a critical point, instantaneous action is generated, so that a movable contact at the tail end of the action reed is quickly connected with or disconnected from a fixed contact. When the acting force on the transmission element is removed, the action reed generates reverse action force, and when the reverse stroke of the transmission element reaches the action critical point of the reed, the reverse action is instantly finished.

The contact between the pressing elastic sheet and the tympanic membrane part of the conventional AZ-7311 microswitch has structural defects, as shown in FIG. 1, a moving low pair exists on the contact surface between the pressing elastic sheet and the tympanic membrane assembly, and when an external force acts on the contact surface, a radial component force is generated due to the fact that the tympanic membrane is made of a flexible material, so that a relative motion exists between the pressing elastic sheet and the tympanic membrane assembly, and accidental action response is not timely or is not responded for a single time (continuous times). Even if the circuit has a stroke action, no signal is transmitted out of the circuit, and finally, the protection device cannot receive the signal and fails to work, so that casualties are caused.

In addition, when the using function of the tympanic membrane part is considered, the material of the tympanic membrane part is selected to be a high-elasticity composite material, but the tympanic membrane part is not fixed during assembly, so that the elastic composite material can contract towards the axis under a complex working condition to cause the conditions of reduction of effective prevention grade protection, incapability of working effectively and the like.

SUMMERY OF THE UTILITY MODEL

The technical problem to be solved by the utility model is as follows: aiming at the problems in the prior art, the utility model provides the microswitch which has a simple structure and can improve the working reliability of the switch.

In order to solve the technical problems, the technical scheme provided by the utility model is as follows:

a microswitch comprises an upper shell and a lower shell, wherein a cavity is formed between the upper shell and the lower shell in a surrounding manner, and a contact working assembly is arranged in the cavity; the contact device comprises a contact working assembly and an upper shell, and is characterized in that a mounting hole is formed in the upper shell, a drum membrane assembly is mounted on the mounting hole, a transmission assembly is mounted on the outer side of the drum membrane assembly, and a limiting assembly is arranged between the drum membrane assembly and a pressing elastic sheet in the contact working assembly and used for limiting the drum membrane assembly and the pressing elastic sheet.

As a further improvement of the above technical solution:

the limiting assembly comprises a buckle, limiting grooves are formed in two sides of one end of the pressing elastic sheet, clamping edges extending into the limiting grooves are arranged on two sides of the buckle, and a limiting barrel is arranged above the buckle.

The limiting groove is a trapezoidal groove.

The buckle is a plastic buckle.

The periphery of the mounting hole of the upper shell is provided with an annular flange, and the tympanic membrane assembly is clamped on the annular flange of the mounting hole.

The periphery of the tympanic membrane assembly is secured to the annular rim by a fastening assembly.

The fastening component is a hoop.

The transmission assembly comprises a limiting sleeve, an elastic thimble and a guide rod, one end of the guide rod is connected with one end of the elastic thimble, the other end of the elastic thimble extends into the tympanic membrane assembly of the mounting hole, and the roller, the guide rod and the elastic thimble are all located in the limiting sleeve.

And the other end of the guide rod is provided with a roller.

The elastic ejector pin comprises an ejector pin and a spring, a stopping part is arranged on one side of the mounting hole of the ejector pin, the spring is sleeved on the ejector pin, and one end of the spring is abutted to the stopping part.

Compared with the prior art, the utility model has the advantages that:

(1) according to the micro switch, the drum membrane assembly and the pressing elastic sheet are limited to a certain extent through the limiting assembly, so that no relative movement exists between the drum membrane assembly and the contact surface of the pressing elastic sheet, and the torque is unified into the axial working torque of the switch, so that the effective trigger signal of the switch stroke action is ensured, and the working reliability is improved.

(2) The limiting groove adopts a trapezoidal groove design; when the reed assembly is blocked due to mechanical failure, the tympanic membrane assembly and the limiting assembly can move along the directions of the slope openings on the two sides of the trapezoidal groove to unload force when the stress of the tympanic membrane assembly and the limiting assembly reaches a critical point, so that the interior is not damaged violently, and a certain protection effect is generated.

(3) According to the utility model, the hoop is additionally arranged at the interface of the tympanic membrane assembly, the center of the tympanic membrane assembly cannot contract when being collided by the thimble of the transmission assembly, so that the situations that the protection level is reduced and the switch cannot work effectively due to contraction of the tympanic membrane assembly are avoided; meanwhile, the hoop can enable the tympanic membrane assembly and the mounting hole of the upper shell to be attached more tightly, so that the effect of improving the protection level is achieved.

(4) The utility model reduces accidental failure accidents by additionally arranging the limiting component, and further improves the protection grade and the mechanical service life of the switch by additionally arranging the hoop; the additional installation has simple structure and low cost, can be produced in batches and is safe and feasible.

Drawings

Fig. 1 is a schematic diagram of an explosion structure of a microswitch in the prior art.

Fig. 2 is a front view of an embodiment of the microswitch of the present invention.

Fig. 3 is a side view of an embodiment of a microswitch of the present invention.

Fig. 4 is a view a-a of fig. 3.

Fig. 5 is a block diagram of an embodiment of a spacing assembly of the present invention.

Fig. 6 is a schematic view of the matching relationship between the limiting assembly and the pressing spring plate.

Fig. 7 is a structural diagram of a limiting groove on a pressing spring plate according to an embodiment of the utility model.

Fig. 8 is a schematic view of the engagement between the tympanic membrane assembly and the mounting aperture of the present disclosure.

Fig. 9 is a structural view of the hoop according to the embodiment of the present invention.

Illustration of the drawings: 1. an upper housing; 101. mounting holes; 102. an annular flange; 2. a lower housing; 3. a contact working assembly; 301. pressing the elastic sheet; 3011. a limiting groove; 302. a reed assembly; 303. normally closing the fixed contact; 304. a normally open fixed contact; 305. a movable contact; 4. a tympanic membrane assembly; 401. a fastening assembly; 5. a transmission assembly; 501. a limiting sleeve; 502. an elastic thimble; 5021. a thimble; 5022. a spring; 503. a guide bar; 504. a roller; 505. a mounting member; 6. a limiting component; 601. buckling; 602. edge clamping; 603. a limiting cylinder.

Detailed Description

The utility model is further described below with reference to the figures and the specific embodiments of the description.

As shown in fig. 2 to 4, the micro switch of the present embodiment includes an upper housing 1 and a lower housing 2, a cavity is formed between the upper housing 1 and the lower housing 2, a contact operating assembly 3 is disposed in the cavity, and the structure of the contact operating assembly 3 is the same as that of the existing structure, and includes a pressing spring piece 301, a spring piece assembly 302, a normally closed fixed contact 303, a normally open fixed contact 304, a moving contact 305, and the like; the upper shell 1 is provided with a mounting hole 101, the mounting hole 101 is provided with a drum membrane assembly 4, the outer side of the drum membrane assembly 4 is provided with a transmission assembly 5, and a limiting assembly 6 is arranged between the drum membrane assembly 4 and a pressing elastic sheet 301 in the contact working assembly 3 and used for limiting the drum membrane assembly 4 and the pressing elastic sheet 301. Specifically, the limiting assembly 6 includes a buckle 601, two sides of one end of the pressing spring 301 are provided with a limiting groove 3011, two sides of the buckle 601 are provided with a clamping edge 602 extending into the limiting groove 3011, i.e., the clamping edge 602 is clamped in the limiting groove 3011, a limiting cylinder 603 is arranged above the buckle 601, wherein the top end of the tympanic membrane assembly 4 is located in the limiting cylinder 603, and the thimble 5021 of the corresponding transmission assembly 5 can press the tympanic membrane assembly 4 to the limiting cylinder 603 during operation. According to the micro switch, the tympanic membrane assembly 4 and the pressing elastic sheet 301 are limited to a certain extent through the limiting assembly 6, namely the clamping edge 602 is matched with the limiting groove 3011 to ensure that the buckle 601 and the pressing elastic sheet 301 do not move relatively, and then the limiting cylinder 603 is matched with the top end of the tympanic membrane assembly 4 and the thimble 5021 to ensure that the contact surface of the tympanic membrane assembly 4 and the pressing elastic sheet 301 does not move relatively, so that the moment is unified into the axial working moment of the switch, the switch action can effectively trigger signals, and the working reliability is improved.

In one embodiment, the clip 601 is a plastic clip, and the limiting groove 3011 is a trapezoidal groove, as shown in fig. 7. When the reed assembly 302 is blocked due to mechanical failure, the tympanic membrane assembly 4 and the limiting assembly 6 can move along the directions of the inclined mouths on the two sides of the trapezoidal groove to discharge force when the stress reaches a critical point, so that the interior of the tympanic membrane assembly is not damaged violently, and a certain protection effect is generated.

In a specific embodiment, the circumferential side of the mounting hole 101 of the upper casing 1 is provided with an annular rib 102, and the tympanic membrane assembly 4 is clamped on the annular rib 102 of the mounting hole 101. Wherein the periphery of the tympanic membrane assembly 4 is fastened to the annular rib 102 by a fastening assembly 401 (e.g., a hoop). By additionally arranging the anchor ear at the interface of the tympanic membrane assembly 4, the center of the tympanic membrane assembly 4 cannot contract when being impacted by the thimble 5021 of the transmission assembly 5, so that the conditions that the protection level is reduced and the switch cannot work effectively due to the contraction of the tympanic membrane assembly 4 are avoided; meanwhile, the hoop can enable the tympanic membrane assembly 4 to be attached to the mounting hole 101 of the upper shell 1 more tightly, so that the protection grade is improved.

In an embodiment, the transmission assembly 5 includes a limiting sleeve 501, a resilient thimble 502 and a guide rod 503, one end of the guide rod 503 is connected to one end of the resilient thimble 502, the other end of the guide rod 503 is provided with a roller 504, the other end of the resilient thimble 502 extends into the tympanic membrane assembly 4 of the mounting hole 101, and the roller 504, the guide rod 503 and the resilient thimble 502 are all located in the limiting sleeve 501. The elastic thimble 502 includes a thimble 5021 and a spring 5022, the thimble 5021 is provided with a stop portion on one side of the mounting hole 101, the spring 5022 is sleeved on the thimble 5021, and one end of the spring 5022 abuts against the stop portion. The transmission assemblies 5 are mounted on a mounting member 505, and the mounting member 505 is fastened to the upper casing 1. In addition, the contact working assembly 3 includes three end points in total: COM (common), NO (normally open), NC (normally closed).

The working principle is as follows: when external force acts on the roller 504, the external roller 504 pushes the guide rod 503 to enable the thimble 5021 to collide with the drum membrane assembly 4, so that the kinetic energy of the force acting on the spring assembly 302 is converted into elastic potential energy, the action spring instantaneously acts when the force applied to the action spring reaches a critical point, the movable contact 305 at the tail end of the spring is rapidly conducted with the fixed contact, the normally open fixed contact 304 is closed, and the normally closed fixed contact 303 is disconnected; when the external torque disappears, the reed assembly 302 resets the action instantly by means of the elastic potential energy of the reed assembly, the normally open fixed contact 304 is disconnected, and the normally closed fixed contact 303 is closed; the moving speed of the moving contact is independent of the moving speed of the transmission component 5.

The utility model reduces accidental failure accidents by additionally arranging the limiting component 6, and further improves the protection grade and the mechanical service life of the switch by additionally arranging the hoop; the additional installation has the advantages of simple structure, low cost, batch production, safety and feasibility, and machine accidents can be reduced.

The above are only preferred embodiments of the present invention, and the scope of the present invention is not limited to the above examples, and all technical solutions that fall under the spirit of the present invention belong to the scope of the present invention. It should be noted that modifications and embellishments within the scope of the utility model may be made by those skilled in the art without departing from the principle of the utility model.

Claims

1. A microswitch comprises an upper shell (1) and a lower shell (2), wherein a cavity is formed between the upper shell (1) and the lower shell (2) in a surrounding manner, and a contact working assembly (3) is arranged in the cavity; the upper shell (1) is provided with a mounting hole (101), the mounting hole (101) is provided with a drum membrane assembly (4), the outer side of the drum membrane assembly (4) is provided with a transmission assembly (5), and the upper shell is characterized in that a limiting assembly (6) is arranged between the drum membrane assembly (4) and a pressing elastic sheet (301) in the contact working assembly (3) and used for limiting the drum membrane assembly (4) and the pressing elastic sheet (301).

2. The microswitch of claim 1, wherein the limiting component (6) comprises a buckle (601), limiting grooves (3011) are formed in two sides of one end of the pressing elastic sheet (301), clamping edges (602) extending into the limiting grooves (3011) are arranged on two sides of the buckle (601), and a limiting cylinder (603) is arranged above the buckle (601).

3. The microswitch of claim 2, wherein the limit slot (3011) is a trapezoidal slot.

4. A microswitch according to claim 2 or 3, wherein the catch (601) is a plastic catch.

5. The microswitch according to claim 1, 2 or 3, wherein an annular rib (102) is arranged on the periphery of the mounting hole (101) of the upper shell (1), and the tympanic membrane assembly (4) is clamped on the annular rib (102) of the mounting hole (101).

6. The microswitch of claim 5, wherein the periphery of the tympanic membrane assembly (4) is fastened to the annular rib (102) by a fastening assembly (401).

7. Microswitch according to claim 6, wherein the fastening assembly (401) is a hold hoop.

8. The microswitch of claim 1, 2 or 3, wherein the transmission assembly (5) comprises a limiting sleeve (501), an elastic thimble (502) and a guide rod (503), one end of the guide rod (503) is connected with one end of the elastic thimble (502), the other end of the elastic thimble (502) extends into the tympanic membrane assembly (4) of the mounting hole (101), and the guide rod (503) and the elastic thimble (502) are both positioned in the limiting sleeve (501).

9. Microswitch according to claim 8, wherein the other end of the guide bar (503) is provided with a roller (504).

10. The microswitch of claim 8, wherein the elastic thimble (502) comprises a thimble (5021) and a spring (5022), the thimble (5021) is provided with a stop portion at one side of the mounting hole (101), the spring (5022) is sleeved on the thimble (5021) and one end of the spring abuts against the stop portion.