Limit switches

Abstract

The utility model relates to a limit switch, including a base, a front telescopic rod, a rear telescopic rod, a front fixed contact, a rear fixed contact and a movable sheet; the base includes a main body, a front seat connected to the main body and a rear seat connected to the main body, the front seat and the rear seat are arranged on the main body at intervals; the front telescopic rod is telescopically arranged on the front seat; the rear telescopic rod is telescopically arranged on the rear seat; the front fixed contact is fixedly arranged on the front seat; the rear fixed contact is arranged on the rear seat corresponding to the front fixed contact; one side of the movable sheet abuts against the front telescopic rod, and the other side of the movable sheet abuts against the rear telescopic rod, the movable sheet is provided with a front movable contact and a rear movable contact, the front movable contact is arranged opposite to the front fixed contact, and the rear movable contact is arranged opposite to the rear fixed contact. The utility model has a simple structure, does not need to add additional sensors, and effectively reduces production costs.

Description

Technical Field

[0001] The utility model relates to the technical field of sensors, in particular to a limit switch. Background Art

[0002] Limit switches, also known as travel switches, can be installed on relatively static objects (such as fixed frames, door frames, etc., referred to as static objects) or moving objects (such as vehicles, doors, etc., referred to as animals). When an animal approaches a static object, the switch connecting rod drives the switch contacts to cause the closed contacts to break or the open contacts to close. The change in the open and closed states of the switch contacts controls the circuit and the motor.

[0003] Existing limit switches are usually designed to be complex, resulting in high production costs. Therefore, it is very necessary to develop a limit switch with a simple structure and low production cost. Utility Model Content

[0004] Based on this, it is necessary to provide a limit switch to address the problem that the current limit switch has a complex structure and leads to high production costs.

[0005] A limit switch, comprising:

[0006] A base, the base comprising a main body, a front seat connected to the main body, and a rear seat connected to the main body, the front seat and the rear seat being spaced apart and arranged on the main body;

[0007] A front telescopic rod, the front telescopic rod being telescopically arranged on the front seat portion;

[0008] A rear telescopic rod, the rear telescopic rod being telescopically arranged on the rear seat portion;

[0009] A front fixed contact, wherein the front fixed contact is fixedly disposed on the front seat portion;

[0010] a rear fixed contact, the rear fixed contact being arranged on the rear seat portion corresponding to the front fixed contact; and

[0011] A movable piece, one side of the movable piece abuts against the front telescopic rod, and the other side of the movable piece abuts against the rear telescopic rod, a front movable contact and a rear movable contact are arranged on the movable piece, the front movable contact is arranged opposite to the front fixed contact, and the rear movable contact is arranged opposite to the rear fixed contact.

[0012] The limit switch can well detect the position information of the limited object through the cooperation of the base, the front telescopic rod, the rear telescopic rod, the front fixed contact, the rear fixed contact and the movable sheet. It has a simple structure and does not require additional sensors, thus effectively reducing production costs.

[0013] In one embodiment, the front telescopic rod includes a rear rod and a front rod, the front seat portion is provided with a front mounting groove and a rear mounting groove, the front mounting groove is communicated with the rear mounting groove, the front rod is axially provided with a connecting hole, the front rod extends into the front mounting groove, the rear rod passes through the rear mounting groove and extends into the front mounting groove and is screwed to the connecting hole, and the front rod is fixedly connected to the rear rod.

[0014] In one embodiment, the limit switch also includes a first elastic member, the rear rod includes a rear rod portion and a rear limit portion connected to the rear rod portion, the first elastic member is sleeved outside the rear rod portion, one end of the first elastic member abuts against the bottom of the rear mounting groove, and the other end of the first elastic member abuts against the rear limit portion.

[0015] In one embodiment, the cross-section of the rear limiting portion is circular, and the diameter of the rear limiting portion is larger than the diameter of the rear mounting groove.

[0016] In one embodiment, the limit switch also includes a second elastic member, the front rod includes a front rod portion and a front limit portion connected to the front rod portion, the connecting hole is arranged in the axial direction of the front rod portion, the second elastic member is sleeved on the outside of the front rod portion, one end of the second elastic member abuts against the bottom of the front mounting groove, and the other end of the second elastic member abuts against the front limit portion.

[0017] In one embodiment, the cross-section of the front limiting portion is circular, and the diameter of the front limiting portion is larger than the diameter of the front mounting groove.

[0018] In one embodiment, the limit switch also includes a third elastic member, the rear seat portion is provided with a slide groove, the rear telescopic rod includes a main rod portion and an abutment portion connected to the main rod portion, the abutment portion extends into the slide groove, the third elastic member is sleeved outside the main rod portion, one end of the third elastic member abuts against the movable sheet, and the other end of the third elastic member abuts against the abutment portion.

[0019] In one embodiment, the limit switch further includes a fourth elastic member, which is embedded in the slide groove, one end of the fourth elastic member abuts against the abutting portion, and the other end of the fourth elastic member abuts against the bottom of the slide groove.

[0020] In one embodiment, the limit switch further includes a first terminal, wherein the first terminal is disposed on the front seat portion, and the first terminal is electrically connected to the front fixed contact.

[0021] In one embodiment, the limit switch further includes a second terminal, wherein the second terminal is disposed on the rear seat portion, and the second terminal is electrically connected to the rear fixed contact. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is an assembly structure diagram of a limit switch in one embodiment of the utility model;

[0023] Figure 2 For Figure 1 Cross-section of the limit switch shown.

[0024] The meanings of the numbers in the accompanying drawings are:

[0025] 100-limit switch;

[0026] 10-base, 11-main body, 12-front seat, 121-front fixed contact, 13-rear seat, 131-rear fixed contact;

[0027] 20-front telescopic rod, 21-front rod, 211-front rod portion, 212-front limiting portion, 213-connecting hole, 214-arc surface, 22-rear rod, 221-rear rod portion, 222-rear limiting portion;

[0028] 30-rear telescopic rod, 31-main rod portion, 32-abutment portion;

[0029] 40-movable sheet, 41-front movable contact, 42-rear movable contact;

[0030] 50-a first elastic member;

[0031] 60- second elastic member;

[0032] 70- a third elastic member;

[0033] 80-binding post assembly, 81-first binding post, 82-second binding post;

[0034] 90 - fourth elastic member. DETAILED DESCRIPTION

[0035] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0036] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0037] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0038] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0040] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0041] See also Figure 1 and Figure 2 , is a limit switch 100 according to an embodiment of the present utility model, comprising a base 10, a front telescopic rod 20, a rear telescopic rod 30, a front fixed contact 121, a rear fixed contact 131 and a movable sheet 40, wherein the front telescopic rod 20 and the rear telescopic rod 30 are telescopically arranged on the base 10, the front telescopic rod 20 and the rear telescopic rod 30 are arranged opposite to each other, the front fixed contact 121 and the rear fixed contact 131 are arranged opposite to each other on the base 10 front and back, the movable sheet 40 is arranged between the front telescopic rod 20 and the rear telescopic rod 30, a front movable contact 41 and a rear movable contact 42 are arranged on the movable sheet 40, the front movable contact 41 is arranged opposite to the front fixed contact 121, and the rear movable contact 42 is arranged opposite to the rear fixed contact 131.

[0042] See also Figure 1 and Figure 2 The base 10 includes a main body 11, a front seat 12 connected to the main body 11, and a rear seat 13 connected to the main body 11, and the front seat 12 and the rear seat 13 are arranged on the main body 11 at intervals in front and back. The front seat 12 is provided with a front mounting groove and a rear mounting groove, the front mounting groove is connected to the rear mounting groove, the diameter of the front mounting groove is larger than the diameter of the rear mounting groove, and the rear seat 13 is provided with a slide groove. The number of the front fixed contacts 121 is two, and the two front fixed contacts 121 are arranged on the front seat 12 at intervals in the left and right. The number of the rear fixed contacts 131 is two, and the two rear fixed contacts 131 are arranged on the rear seat 13 at intervals in the left and right.

[0043] See also Figure 1 and Figure 2The front telescopic rod 20 includes a rear rod 22 and a front rod 21, the rear rod 22 includes a rear rod portion 221 and a rear limiting portion 222 connected to the rear rod portion 221, the cross section of the rear rod portion 221 is circular, the diameter of the rear limiting portion 222 is larger than the diameter of the rear mounting groove, the front rod 21 includes a front rod portion 211 and a front limiting portion 212 connected to the front rod portion 211, a connecting hole 213 is axially provided on the front rod portion 211, the cross section of the front limiting portion 212 is circular, the diameter of the front limiting portion 212 is larger than the diameter of the front mounting groove, and the end surface of the front limiting portion 212 away from the front rod portion 211 is provided with a curved surface 214. During installation, the front rod portion 211 extends into the front mounting groove, the rear rod portion 221 passes through the rear mounting groove and extends into the front mounting groove and is screwed to the connecting hole 213, and the front rod 21 is fixedly connected to the rear rod 22. The cooperation of the front rod 21 and the rear rod 22 can effectively simplify the installation difficulty of the front telescopic rod 20, save assembly time, effectively improve assembly efficiency, and reduce production costs. The rear telescopic rod 30 includes a main rod portion 31 and an abutment portion 32 connected to the main rod portion 31, and the abutment portion 32 extends into the slide groove.

[0044] See also Figure 1 and Figure 2 The limit switch 100 also includes a first elastic member 50, which is sleeved on the outside of the rear rod portion 221, one end of the first elastic member 50 abuts against the bottom of the rear mounting groove, and the other end of the first elastic member 50 abuts against the rear limit portion 222.

[0045] See also Figure 1 and Figure 2 The limit switch 100 also includes a second elastic member 60, which is sleeved on the outside of the front rod portion 211, one end of the second elastic member 60 abuts against the bottom of the front mounting groove, and the other end of the second elastic member 60 abuts against the front limit portion 212.

[0046] See also Figure 1 and Figure 2 The limit switch 100 further includes a third elastic member 70 and a fourth elastic member 90. The third elastic member 70 is sleeved outside the rear telescopic rod 30, one end of the third elastic member 70 abuts against the movable sheet 40, and the other end of the third elastic member 70 abuts against the rear seat portion 13; the fourth elastic member 90 is embedded in the slide groove, one end of the fourth elastic member 90 abuts against the rear telescopic rod 30, and the other end of the fourth elastic member 90 abuts against the bottom of the slide groove.

[0047] See also Figure 1 and Figure 2The limit switch 100 also includes a terminal assembly 80, and the terminal assembly 80 includes a first terminal 81 and a second terminal 82. The first terminal 81 is arranged on the front seat portion 12, and the first terminal 81 is electrically connected to the front fixed contact 121; the second terminal 82 is arranged on the rear seat portion 13, and the second terminal 82 is electrically connected to the rear fixed contact 131.

[0048] The working principle of the limit switch 100 in this embodiment is as follows: before operation, the first terminal 81 and the second terminal 82 are both electrically connected to the controller; during operation, the object being limited pushes the arc surface 214, driving the front telescopic rod 20 to move backward, driving the moving plate to move backward, and the moving plate pushes the rear telescopic rod 30 to move along the slide toward the rear seat 13 until the rear moving contact on the moving plate abuts against the rear fixed contact 131, and the controller can receive the signal sent by the second terminal 82, so that the controller can recognize that the object being limited has reached the target position. When the object being limited is removed, under the action of the first elastic member 50, the second elastic member 60 and the third elastic member 70, the movable plate 40 can be quickly reset, so that the front movable contact 41 abuts against the front fixed contact 121 again, and the controller receives the electrical signal sent by the first terminal 81, so that the controller can recognize that the object being limited has been reset.

[0049] The beneficial effects of the utility model are as follows: through the cooperation of the base 10, the front telescopic rod 20, the rear telescopic rod 30, the front fixed contact 121, the rear fixed contact 131 and the movable sheet 40, the position information of the limited object can be well detected; the structure is simple, no additional sensors are required, and the production cost is effectively reduced.

[0050] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0051] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A limit switch, characterized in that: include: A base, the base comprising a main body, a front seat connected to the main body, and a rear seat connected to the main body, the front seat and the rear seat being spaced apart and arranged on the main body; A front telescopic rod, the front telescopic rod being telescopically arranged on the front seat portion; A rear telescopic rod, the rear telescopic rod being telescopically arranged on the rear seat portion; a front fixed contact, the front fixed contact being fixedly disposed on the front seat portion; a rear fixed contact, the rear fixed contact being arranged on the rear seat portion corresponding to the front fixed contact; as well as A movable piece, one side of the movable piece abuts against the front telescopic rod, and the other side of the movable piece abuts against the rear telescopic rod, a front movable contact and a rear movable contact are arranged on the movable piece, the front movable contact is arranged opposite to the front fixed contact, and the rear movable contact is arranged opposite to the rear fixed contact.

2. The limit switch according to claim 1, characterized in that: The front telescopic rod includes a rear rod and a front rod, the front seat portion is provided with a front mounting groove and a rear mounting groove, the front mounting groove is communicated with the rear mounting groove, the front rod is axially provided with a connecting hole, the front rod extends into the front mounting groove, the rear rod passes through the rear mounting groove and extends into the front mounting groove and is screwed to the connecting hole, and the front rod is fixedly connected to the rear rod.

3. The limit switch according to claim 2, characterized in that: It also includes a first elastic member, the rear rod includes a rear rod portion and a rear limiting portion connected to the rear rod portion, the first elastic member is sleeved outside the rear rod portion, one end of the first elastic member abuts against the bottom of the rear mounting groove, and the other end of the first elastic member abuts against the rear limiting portion.

4. The limit switch according to claim 3, characterized in that: The cross section of the rear limiting portion is circular, and the diameter of the rear limiting portion is greater than the diameter of the rear installation groove.

5. The limit switch according to claim 4, characterized in that: It also includes a second elastic member, the front rod includes a front rod portion and a front limiting portion connected to the front rod portion, the connecting hole is arranged in the axial direction of the front rod portion, the second elastic member is sleeved on the outside of the front rod portion, one end of the second elastic member abuts against the bottom of the front mounting groove, and the other end of the second elastic member abuts against the front limiting portion.

6. The limit switch according to claim 5, characterized in that: The cross section of the front limiting portion is circular, and the diameter of the front limiting portion is greater than the diameter of the front mounting groove.

7. The limit switch according to claim 1, characterized in that: It also includes a third elastic member, the rear seat portion is provided with a slide groove, the rear telescopic rod includes a main rod portion and an abutment portion connected to the main rod portion, the abutment portion extends into the slide groove, the third elastic member is sleeved outside the main rod portion, one end of the third elastic member abuts against the movable sheet, and the other end of the third elastic member abuts against the abutment portion.

8. The limit switch according to claim 7, characterized in that: It also includes a fourth elastic member, which is embedded in the slide groove, one end of the fourth elastic member abuts against the abutment portion, and the other end of the fourth elastic member abuts against the bottom of the slide groove.

9. The limit switch according to claim 1, characterized in that: It also includes a first terminal, which is arranged on the front seat portion and is electrically connected to the front fixed contact.

10. The limit switch according to claim 1, characterized in that: It also includes a second terminal, which is arranged on the rear seat portion and is electrically connected to the rear fixed contact.

Images