CN214588495U

CN214588495U - Self-locking travel switch

Info

Publication number: CN214588495U
Application number: CN202120642246.4U
Authority: CN
Inventors: 王学平; 刘文明; 罗明; 常雪麟
Original assignee: Shanghai No2 Machine Tool Electrical Factory Co ltd
Current assignee: Shanghai No2 Machine Tool Electrical Factory Co ltd
Priority date: 2021-03-30
Filing date: 2021-03-30
Publication date: 2021-11-02
Anticipated expiration: 2031-03-30

Abstract

The application discloses from locking-type travel switch. The self-locking travel switch comprises a shell, a push rod assembly and a limiting assembly. The shell is formed by surrounding a base, a cover plate, a front end cover and a rear end cover. A first stationary contact and a second stationary contact are arranged in the base. The push rod assembly is movably arranged in the stroke channel and comprises a movable push rod, and a first contact bridge and a second contact bridge which are symmetrically arranged on two sides of the movable push rod. And the first contact bridge and the second contact bridge are respectively contacted with the first static contact and the second static contact to form two loop systems. The limiting assembly comprises a limiting rod, and the limiting rod is arranged to automatically limit the movement of the movable push rod when the first movable contact is in contact with the first fixed contact or the second movable contact is in contact with the second fixed contact. The self-locking travel switch is simple in structure, easy to operate and maintain and capable of effectively improving controllability of the travel switch.

Description

Self-locking travel switch

Technical Field

The utility model relates to a switchgear technical field especially relates to a from locking-type travel switch.

Background

A travel switch is one of position switches (also called limit switches) and is a common low-current master control electrical appliance. The contact of the mechanical moving part is correspondingly collided, and the connection or disconnection of different loop systems is realized, so that a certain control purpose is achieved. Generally, such switches are used to limit the position or stroke of the movement of the machine, so that the moving machine can automatically stop, move in reverse, shift or automatically move back and forth according to a certain position or stroke.

Conventional travel switches are generally classified into electrically or magnetically controlled switches and mechanically controlled switches. The electric or magnetic control switch has higher cost, complex internal working condition and higher later-stage overhauling and maintenance difficulty. The mechanical control switch is low in cost, but poor in controllability.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a main aim at provides a from locking-type travel switch utilizes the removal of spacing movable push rod when first movable contact and first stationary contact or second movable contact and the contact of second stationary contact, can effectively improve travel switch's controllability.

Another object of the utility model is to provide a from locking-type travel switch, inner structure is simple, easy later stage's maintenance and maintenance, easily operation.

Another object of the utility model is to provide a from locking-type travel switch connects first contact bridge and second contact bridge can be fine through first elastic element and satisfies travel switch's overtravel needs, the wearing and tearing between very big first movable contact of reduction, second movable contact and first stationary contact, the second stationary contact.

Another object of the utility model is to provide a from locking-type travel switch can make travel switch have self-locking function through setting up waist type hole, stopper, third elastic element and ring groove to realize travel switch's unblock through simple press self-locking button, it is very convenient to control.

Another object of the utility model is to provide a from locking-type travel switch, through setting up two ring-shaped groove to it is corresponding with the contact point of first movable contact and first stationary contact and the contact point of second movable contact and second stationary contact, makes travel switch all have self-locking function at two strokes, the lower travel switch of adaptation switching frequency that can be good, makes travel switch's use safe and reliable more.

In order to achieve at least one of the above purposes of the present invention, the present invention provides a self-locking type travel switch, wherein the self-locking type micro-switch comprises a housing, a push rod assembly and a limit assembly, wherein the housing is surrounded by a base, a cover plate, a front end cover and a rear end cover, a travel channel matched with the push rod assembly is arranged in the base, and a first stationary contact and a second stationary contact are symmetrically arranged on two sides of the travel channel;

the push rod component is movably arranged in the stroke channel and comprises a movable push rod, and a first contact bridge and a second contact bridge which are symmetrically arranged at two sides of the movable push rod, wherein the movable push rod partially protrudes out of the front end cover to form a switch button, the first contact bridge and the second contact bridge are both arranged between the first fixed contact and the second fixed contact, the first contact bridge is provided with a first movable contact matched with the first fixed contact, and the second contact bridge is provided with a second movable contact matched with the second fixed contact, so that when the movable push rod is moved, contact can be formed between the first movable contact and the first fixed contact or between the second movable contact and the second fixed contact;

the limiting assembly comprises a limiting rod, and the limiting rod is arranged to automatically limit the movement of the movable push rod when the first movable contact is in contact with the first fixed contact or the second movable contact is in contact with the second fixed contact.

In a possible embodiment, the movable push rod is provided with a travel chamber adapted to accommodate the first contact bridge and the second contact bridge, the travel chamber being provided with a first elastic element connected in compression between the first contact bridge and the second contact bridge.

In a possible embodiment, a mounting seat adapted to mount the first elastic element is provided between the first contact bridge and the first elastic element and between the second contact bridge and the first elastic element.

In a possible embodiment, the first elastic element is implemented as a spring, and a side of the mounting seat near the first elastic element is provided with a limit protrusion adapted to be embedded in the spring.

In a possible embodiment, the limiting rod is arranged on the front end cover along a direction perpendicular to the moving direction of the movable push rod, and protrudes out of the front end cover at one side to form a self-locking button;

a waist-shaped hole is formed in the limiting rod along the length direction, a limiting block is arranged in the waist-shaped hole, the limiting block is positioned at one end far away from the self-locking button, and an arc-shaped concave structure matched with the movable push rod is arranged on the limiting block;

the limiting assembly further comprises a second elastic element, wherein the second elastic element is connected between one end, away from the self-locking button, of the limiting rod and the inner wall of the front end cover in a compressed mode;

the movable push rod is embedded in the waist-shaped hole in a sliding mode, an annular clamping groove suitable for containing the limiting block is formed in the preset position of the movable push rod, and therefore when the first movable contact and the first fixed contact are in contact or the second movable contact and the second fixed contact are in contact, the limiting block can be clamped into the annular clamping groove under the action of the rebound force of the second elastic element to form self-locking.

In a possible embodiment, the ring slot is implemented as one, and the stopper is disposed at a side close to the switch button.

In a possible embodiment, the push rod assembly further includes a third elastic element, wherein the third elastic element is disposed in a compressed manner between an end of the movable push rod away from the front end cover and the housing.

In a possible embodiment, an end of the movable push rod close to the front end cover is provided with a guide hole adapted to receive the third elastic element.

In a possible embodiment, the annular clamping grooves are implemented in two, and the two annular clamping grooves are respectively positioned corresponding to the contact point of the first movable contact and the first fixed contact and the contact point of the second movable contact and the second fixed contact.

In a possible implementation mode, the limiting block is close to the middle of the waist-shaped hole;

the push rod assembly further comprises a fourth elastic element, wherein the fourth elastic element is arranged between one end of the movable push rod far away from the front end cover and the shell in a manner of being stretched when the first movable contact is contacted with the first fixed contact and being compressed when the second movable contact is contacted with the second fixed contact.

These and other objects, features and advantages of the present invention will become more fully apparent from the following detailed description.

Drawings

Fig. 1 shows a schematic structural diagram of a self-locking travel switch according to a preferred embodiment of the present application.

Fig. 2 shows an internal structural schematic diagram of a self-locking travel switch according to a preferred embodiment of the present application.

Fig. 3 shows a schematic view of the construction of the push rod assembly of the present application.

Fig. 4 shows a schematic structural diagram of a position limiting assembly in the present application.

Fig. 5 shows a schematic structural view of a first contact bridge according to the present application.

Fig. 6 shows a schematic structural view of a movable push rod in another preferred embodiment of the present application.

Fig. 7 shows a schematic structural diagram of a position limiting assembly in another preferred embodiment of the present application.

Detailed Description

The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art. The basic principles of the invention, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents and other technical solutions without departing from the spirit and scope of the invention.

It will be understood by those skilled in the art that in the disclosure of the specification, the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships that are based on those shown in the drawings, which are merely for convenience in describing the invention and to simplify the description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore the terms should not be construed as limiting the invention.

A self-locking travel switch according to a preferred embodiment of the present invention will be described in detail below with reference to fig. 1 to 5 of the specification, wherein the self-locking travel switch includes a housing 10, a push rod assembly 20, and a limit assembly 30. The housing 10 is surrounded by a base 11, a cover 12, a front cover 13 and a rear cover 14, wherein the front cover 13 and the rear cover 14 are respectively arranged at the front end and the rear end of the housing 10 in a sealing manner, and the base 11 has a base cavity which is sealed at the side by the cover 12. A stroke channel matched with the push rod assembly 20 is arranged in the base 11, and a first stationary contact 111 and a second stationary contact 112 are symmetrically arranged on two sides of the stroke channel, wherein the first stationary contact 111 is close to the front end cover 13, and the second stationary contact 112 is close to the rear end cover 14.

The push rod assembly 20 is movably provided to the stroke passage to be capable of being driven to move in a passage direction of the stroke passage. The push rod assembly 20 comprises a movable push rod 21, and a first contact bridge 22 and a second contact bridge 23 symmetrically arranged at two sides of the movable push rod 21, wherein the left end part of the movable push rod 21 protrudes out of the front end cover 13 to form a switch button 211, so as to facilitate the manual operation of the travel switch. The first contact bridge 22 and the second contact bridge 23 are both disposed between the first stationary contact 111 and the second stationary contact 112, wherein the first contact bridge 22 is provided with a first movable contact 221 matched with the first stationary contact 111, and the second contact bridge 23 is provided with a second movable contact 231 matched with the second stationary contact 112, so that when the movable push rod 21 is moved, contact can be made between the first movable contact 221 and the first stationary contact 111 or between the second movable contact 231 and the second stationary contact 112, thereby communicating with the left loop system on the left side or communicating with the right loop system on the right side.

The limiting assembly 30 comprises a limiting rod 31. The stopper rod 31 is provided to automatically stop the movement of the movable push rod 21 when the first movable contact 221 is in contact with the first stationary contact 111 or the second movable contact 231 is in contact with the second stationary contact 112.

Specifically, when the switch button 211 is pressed inward (i.e., rightward) to a certain position, the second movable contact 231 moves rightward to contact with the second stationary contact 112, so that the right loop system is connected; when the switch button 211 is moved outward (i.e., leftward) after the position limiting assembly 30 is unlocked, the first movable contact 221 moves leftward to contact with the first fixed contact 111, so that the left loop system is connected, and meanwhile, the second movable contact 231 is driven to move leftward to separate from the second fixed contact 112, so that the right loop system is disconnected.

The self-locking travel switch has the advantages of simple mechanical structure, low cost and easy operation, can form self-locking in a preset loop system, such as a left loop system between the first movable contact 221 and the first fixed contact 111 or a right loop system between the second movable contact 231 and the second fixed contact 112, and has more flexible use and wider application range.

To meet the process requirements, the movable push rod 21 is provided with a travel chamber 212 adapted to accommodate the first contact bridge 22 and the second contact bridge 23. A first spring element 24 is arranged in the travel chamber 212 and is connected in compression between the first contact bridge 22 and the second contact bridge 23. Under the limiting action of the stroke cavity 212, the first elastic element 24 forms elastic support between the first contact bridge 22 and the second contact bridge 23, so that the first contact bridge 22 and the second contact bridge 23 are elastically fixed in the stroke cavity 212. In addition, when the first movable contact 221 contacts the first fixed contact 111 or the second movable contact 231 contacts the second fixed contact 112, the first elastic element 24 provides a flexible transition, which can avoid rigid connection between the movable contacts (221, 231) and the fixed contacts (111, 112), thereby reducing abrasion between the movable contacts and the fixed contacts, and further improving the service life of the travel switch.

It is worth mentioning that the mounting seats 222 adapted to mount the first elastic element 24 are respectively disposed between the first contact bridge 22 and the first elastic element 24 and between the second contact bridge 23 and the first elastic element 24, so as to facilitate the mounting of the first elastic element 24, and avoid negative effects, such as abrasion or relative displacement and dislocation, caused by the first elastic element 24 directly connecting the first contact bridge 22 or the second contact bridge 23 during the use process.

It should be noted that the first elastic element 24 is preferably implemented as a spring. In addition, in order to ensure that the first elastic element 24 can directionally stretch and contract in the moving process of the movable push rod 21, a limiting protrusion 223 suitable for being embedded in the spring is arranged on one side of each of the two installation seats 222 close to the first elastic element 24, so that the installation of the spring is facilitated, and good guiding and limiting effects can be achieved.

As a preferred embodiment of the present invention, the position-limiting rod 31 is disposed on the front end cover 13 along a direction perpendicular to the moving direction of the movable push rod 21, and protrudes from the front end cover 13 at one side thereof to form a self-locking button 311;

a waist-shaped hole 312 is formed in the limiting rod 31 along the length direction. A limit block 32 is arranged in the waist-shaped hole 312, wherein the limit block 32 is located at one end far away from the self-locking button 311, and the limit block 32 is provided with an arc-shaped concave structure matched with the movable push rod 21, so that the movable push rod 21 can freely slide left and right in the arc-shaped concave structure of the limit block 32 in the process that the first movable contact 221 is not contacted with the first fixed contact 111 and the second movable contact 231 is not contacted with the second fixed contact 112;

the position limiting assembly 30 further comprises a second elastic element 33, wherein the second elastic element 33 is connected in a compressed manner between one end of the position limiting rod 31 far away from the self-locking button 311 and the inner wall of the front end cover 13 so as to elastically support the position limiting rod 31 in the front end cover 13;

the movable push rod 21 is slidably inserted into the waist-shaped hole 312, and an annular groove 213 adapted to accommodate the stopper 32 is disposed at a predetermined position of the movable push rod 21, so that when the first movable contact 221 and the first fixed contact 111 are in contact or the second movable contact 231 and the second fixed contact 112 are in contact, the stopper 32 can be clamped into the annular groove 213 under the action of the repulsive force of the second elastic element 33 to form self-locking.

That is to say, in the moving process of the movable push rod 21, when the first movable contact 221 is not in contact with the first fixed contact 111 or the second movable contact 231 is not in contact with the second fixed contact 112, the movable push rod 21 can slide left and right in the kidney-shaped hole 311 of the limit rod 31, and when the first movable contact 221 is in contact with the first fixed contact 111 or the second movable contact 231 is in contact with the second fixed contact 112, the limit block 32 is just located in the range of the annular groove 213 of the movable push rod 21, and under the action of the repulsive force of the second elastic element 33, the limit rod 31 drives the limit block 32 to be automatically clamped in the annular groove 213, so as to form self-locking.

In a possible embodiment, the ring slot 213 is implemented as one, and the stopper 32 is disposed at a side close to the switch button 211, that is, the stopper 32 is disposed at the leftmost side of the kidney-shaped hole 312. When the stopper 32 is disposed at the leftmost side of the kidney-shaped hole 312, the position of the ring-shaped slot 213 corresponds to the contact position of the second movable contact 231 and the second stationary contact 112, so that the stopper rod 31 forms a self-lock by the cooperation of the stopper 32 and the ring-shaped slot 213 when the right loop system is communicated.

As a preferred embodiment of the present invention, the push rod assembly 20 further includes a third elastic element 25, wherein the third elastic element 25 is compressed and disposed between the end of the movable push rod 21 far away from the front end cover 13 and the housing 10, so that after the self-locking of the position limiting assembly 30 is released, the movable push rod 21 can automatically reset and move leftwards due to the resilience of the third elastic element 25.

It is worth mentioning that the end of the movable push rod 21 close to the front end cap 13 is provided with a guiding hole 214 adapted to receive the third elastic element 25. The third elastic element 25 is limited and guided through the guide hole 214, so that the third elastic element 25 is prevented from displacing beyond the telescopic direction in the telescopic process

As another preferred embodiment of the present invention, referring to fig. 6 and 7, the ring-shaped slot 213 is implemented in two, and the positions of the two ring-shaped slots 213 correspond to the contact point of the first movable contact 221 and the first fixed contact 111 and the contact point of the second movable contact 231 and the second fixed contact 112, respectively.

In one possible embodiment, the stopper 32 is located near the middle of the kidney-shaped hole 312;

the push rod assembly 20 further includes a fourth elastic member 26, wherein the fourth elastic member 26 is disposed between an end of the movable push rod 21 away from the front cover 13 and the housing 10 in such a manner as to be stretched when the first movable contact 221 is in contact with the first stationary contact 111 and to be compressed when the second movable contact 231 is in contact with the second stationary contact 112.

In other words, two ring slots 213 are provided, and the positions of the two ring slots 213 correspond to the contact points of the first movable contact 221 and the first fixed contact 111, and the contact points of the second movable contact 231 and the second fixed contact 112, respectively. When the first movable contact 221 contacts with the first fixed contact 111, the stopper 32 is just caught in the annular catching groove 213 on the right side, and the fourth elastic element 26 is in a stretched state, and after the stopper assembly 30 is unlocked, due to the retraction force of the fourth elastic element 26, the movable push rod 21 is pulled by the retraction force to move rightward, so that the first movable contact 221 gradually moves away from the first fixed contact 111, and the second movable contact 231 gradually moves closer to the second fixed contact 112, in this case, the movable push rod 21 can be pushed to move rightward by a slight force until the second movable contact 231 contacts with the second fixed contact 112, and the stopper 32 is just inside the annular catching groove 213 on the left side, and the fourth elastic element 26 is in a compressed state, and the stopper assembly 30 is unlocked, under the action of the rebounding force of the fourth elastic element 26, the movable push rod 21 is pushed to move leftward, so that the first movable contact 221 gradually approaches the first fixed contact 111, and the second movable contact 231 gradually moves away from the second fixed contact 112, and similarly, the first movable contact 221 can be contacted with the first fixed contact 111 only by a slight force, so as to communicate with the left circuit system.

Therefore, the fourth elastic element 26 can not only form self-locking when the first movable contact 221 and the first fixed contact 111 are contacted and when the second movable contact 231 and the second fixed contact 112 are contacted, respectively, but also provide a certain compression rebound force or a certain stretching retraction force after unlocking, thereby facilitating the operation of the travel switch, saving more labor and being easy to control.

It should be noted that the terms "first, second, third and fourth" in the present invention are used for descriptive purposes only, do not denote any order, are not to be construed as indicating or implying any relative importance, and are to be construed as names.

It will be appreciated by persons skilled in the art that the embodiments of the invention shown in the foregoing description are given by way of example only and are not limiting of the invention. The objects of the present invention have been fully and effectively accomplished. The functional and structural principles of the present invention have been shown and described in the embodiments without departing from the principles, embodiments of the present invention may have any deformation or modification.

Claims

1. A self-locking travel switch is characterized by comprising a shell, a push rod component and a limiting component, wherein the shell is formed by surrounding a base, a cover plate, a front end cover and a rear end cover;

2. The self-locking travel switch according to claim 1, wherein the movable push rod is provided with a travel chamber adapted to accommodate the first contact bridge and the second contact bridge, a first resilient element being arranged in the travel chamber and being connected in compression between the first contact bridge and the second contact bridge.

3. The self-locking travel switch of claim 2, wherein a mounting seat adapted to mount the first elastic element is provided between the first contact bridge and the first elastic element and between the second contact bridge and the first elastic element.

4. The self-locking travel switch according to claim 3, wherein the first elastic element is implemented as a spring, and a side of the mounting seat near the first elastic element is provided with a limit protrusion adapted to be embedded in the spring.

5. The self-locking type travel switch according to claim 1, wherein the limiting rod is arranged on the front end cover along a direction perpendicular to the moving direction of the movable push rod, and protrudes out of the front end cover at one side thereof to form a self-locking button;

6. The self-locking travel switch according to claim 5, wherein the ring slot is implemented as one, and the stopper is disposed at a side close to the switch button.

7. The self-locking travel switch of claim 6, wherein the push rod assembly further comprises a third resilient element, wherein the third resilient element is disposed in compression between an end of the movable push rod remote from the front end cap and the housing.

8. The self-locking travel switch of claim 7, wherein an end of the movable push rod adjacent to the front cover is provided with a guide hole adapted to receive the third elastic element.

9. The self-locking type travel switch according to claim 5, wherein the annular catching grooves are implemented in two, and the two annular catching grooves are located corresponding to the contact point of the first movable contact and the first stationary contact and the contact point of the second movable contact and the second stationary contact, respectively.

10. The self-locking travel switch of claim 9, wherein the stop block is located near the middle of the kidney-shaped hole;