Travel switch with independent compensation contact surface change contacts

Abstract

The utility model belongs to the field of electric contact structures, and particularly relates to a travel switch with independent compensation contact surface change contacts. Which comprises a shell, an operating head, a transmission mechanism, a contact system and a signal output cable group, and is characterized in that the operating head comprises a push block, a limiting boss is arranged on the outer wall of the bottom of the push block, the transmission mechanism is arranged in the shell and comprises a swing rod and a sliding column, the sliding column is transversely arranged in the left-right direction, and the push block is arranged on the swing rod. The swing rod is arranged between the sliding column and the limiting push block, the contact system comprises a movable contact mechanism and a static contact mechanism, the movable contact mechanism comprises a cylindrical conductive ring, the static contact mechanism comprises a conductive annular spring and a conductive sleeve, and the sliding column is inserted into the conductive sleeve. According to the travel switch, the elastic ring is sleeved on the cylindrical surface, so that the contact reliability of the product contact is improved, and the maintainability is good.

Description

Technical Field

[0001] The utility model belongs to the field of the structure of electrical contact parts, and particularly relates to a travel switch with independent compensation for contact surface change contacts. Background Art

[0002] A travel switch, also known as a limit switch, is a device that switches electrical signals according to the travel position of a moving part. The product mainly consists of components such as a moving part, a housing part, a contact spring system, and an output part. The working principle is as follows: taking a group of normally open and a group of normally closed travel switches as an example, under the action of an external force, after the moving part moves to a certain travel, the moving part drives the normally closed moving contact spring away from the static contact spring, the normally closed contact is disconnected, and the closed group signal is cut off and output; when the moving part continues to move to a certain travel, the moving part drives the normally open moving contact spring to connect with the static contact spring, the normally open group is connected, and the signal is connected and output. The common structural form of the moving contact and the static contact is the structure of a reed, and the contact form of the contact is often point contact, surface contact, or line contact. Among them, a larger pressure is required for good contact in surface contact, and the self-cleaning effect is poor. Line contact is the most widely used. Even when the pressure is not large, the pressure at the contact is relatively high, the contact resistance is small, and the self-cleaning effect of the contact is strong. However, due to the still limited contact surface, there are still certain limitations in reducing the contact resistance. Moreover, the contact form of the contact is a hard contact. If there are changes in the contact point, surface, or line, compensation cannot be obtained, and there will be a phenomenon of poor quality consistency of the contact resistance, affecting the overall reliability of the product. Content of the Utility Model

[0003] The purpose of the utility model is to solve the deficiencies existing in the existing structural design of the existing travel switch, and to provide a travel switch with independent compensation for contact surface change contacts, which has reliable operation and low failure rate.

[0004] The technical solutions for achieving the above purpose include the following content.

[0005] A travel switch with an independent compensation contact surface change contact, comprising a housing, an operating head, a transmission mechanism, a contact system and a signal output cable group. The operating head includes a push block vertically arranged at one end of the housing. The push block is slidably mounted in a through hole opened on the housing. The top end of the push block is the workpiece contact end and protrudes outside the housing. A limiting boss is provided on the bottom outer wall of the push block. A vertical first return spring is provided between the bottom end surface of the push block and the housing. The transmission mechanism is arranged in the inner cavity of the housing. The transmission mechanism includes a swing rod, a sliding column and a second return spring connected in sequence. The sliding column is horizontally arranged in the left-right direction. Restricted by the inner wall of the housing, the sliding column can move left and right. The swing rod is arranged between the sliding column and the limiting push block. The swing rod is vertically arranged. The upper end of the swing rod is connected to the housing through a rotating shaft. The rotating shaft is perpendicular to the sliding column. The lower part of the swing rod bends towards the push block. The two side surfaces of the swing rod respectively abut against the limiting boss and the sliding column. The second return spring is horizontally arranged in the left-right direction. One end surface of the second return spring abuts against the end surface of the sliding column, and the other end surface abuts against the inner wall of the housing. The contact system includes a moving contact mechanism and a static contact structure. The moving contact mechanism includes a plurality of cylindrical conductive rings sleeved on the outer wall of the sliding column. The cylindrical conductive rings are insulated from each other and arranged at intervals along the column direction. The static contact mechanism includes a plurality of conductive sleeves and a corresponding number of conductive annular springs. An annular groove is provided on the inner wall of the conductive sleeve. The size of the annular groove matches the outer diameter of the conductive annular spring. The conductive annular spring is accommodated in the annular groove. The conductive sleeve is fixed on the inner wall of the housing. The conductive sleeves are insulated from each other and arranged at intervals in the left-right direction. Each conductive sleeve is electrically connected to a corresponding cable in the signal output cable group. The sliding column penetrates through the conductive sleeve.

[0006] Further, there are 4 conductive sleeves, which is convenient for setting normally open and normally closed signal outputs.

[0007] Further, the conductive sleeve is electrically connected to the cable of the signal output cable group by means of connector crimping connection, which improves the consistency and reliability of the product quality.

[0008] Further, one end surface of the sliding column is an arc-shaped arched surface, and the arc-shaped arched surface abuts against the side surface of the swing rod, reducing friction and improving the durability performance.

[0009] Further, a sealing ring is provided in the through hole, which plays a role of dust-proof sealing, prevents foreign objects from entering the housing, and improves the maintainability.

[0010] When the above travel switch is in use, the moving workpiece pushes the push block (along with the limit boss) downward, and the first return spring is compressed and stores energy under extrusion. When the limit boss abuts against the bent part of the swing rod during its downward movement, the swing rod starts to swing towards the other side, and the sliding column is pushed by the swing rod to move laterally. The outer wall of the cylindrical surface conductive ring on the sliding column comes into contact with or disengages from the inner wall of the conductive ring-shaped spring resting in the conductive sleeve, thereby realizing the conversion and output of normally closed and normally open signals. When the sliding column is pushed by the swing rod to move horizontally, the second return spring is compressed and stores energy under extrusion. When the power supply workpiece returns, the push block rises under the action of the first return spring, the sliding column moves horizontally in the reverse direction under the action of the second return spring, the sliding column pushes the swing rod to swing back, and the lower part (bent part) of the swing rod enters below the push block. Under the action of the limit boss, the push block stops rising, and the travel switch returns to the initial working state.

[0011] The travel switch of the present utility model has the following advantages: First, the contact mode of the moving and static contacts adopts a conductive ring-shaped spring sleeved on the outer wall of the cylindrical surface conductive ring, realizing a circumferential line-surface contact structure, greatly increasing the contact area, reducing the contact resistance, and thus improving the contact reliability of the product contacts. Second, the transmission mechanism adopts a bent swing rod, using the lever principle, which is suitable for the structural design of travel switches with equal height and large stroke, and is also suitable for the design of travel switches with equal stroke and short height. Third, the signal output form combination is flexible. By setting different numbers of conductive sleeves (conductive ring-shaped springs) and matching them with an appropriate number of cylindrical surface conductive rings, travel switches with various output forms can be realized, which can be applied to travel switches with two groups of conversions, or travel switches with one group of normally open and one group of normally closed strokes, and can also be applied to travel switches with two groups of normally open and two groups of normally closed strokes. Description of the Drawings

[0012] Figure 1 Schematic diagram of the structure of the travel switch with an independent compensation contact surface change contact for the embodiment;

[0013] In the figure, 1. Housing; 1-1. Sealing ring; 2. Push block; 2-1. Limit boss; 3. First return spring; 4. Swing rod; 4-1. Rotating shaft; 5. Sliding column; 6. Second return spring; 7. Cylindrical surface conductive ring; 8. Conductive ring-shaped spring; 9. Conductive sleeve; 10. Output cable group. Detailed Embodiment

[0014] The following specifically describes the present utility model in conjunction with the embodiments.

[0015] See Figure 1, a travel switch with an independent compensation contact surface change contact, comprising a housing 1, an operating head, a transmission mechanism, a contact system, and a signal output cable group 10. The operating head includes a push block 2 vertically arranged at the left end of the housing 1. The push block 2 is slidably mounted in a through hole opened on the housing 1. A sealing ring 1-1 is provided on the inner wall of the through hole. The top end of the push block 2 is the workpiece contact end and protrudes outside the housing 1. A limiting boss 2-1 is provided on the outer wall of the bottom of the push block 2. A vertical first return spring 3 is provided between the bottom end surface of the push block 2 and the bottom wall of the housing 1;

[0016] The transmission mechanism is arranged in the inner cavity of the housing 1. The transmission mechanism includes a swing rod 4, a sliding column 5, and a second return spring 6 arranged in sequence from left to right. The sliding column 5 is horizontally arranged in the left-right direction. Restricted by the inner wall of the housing 1, the sliding column 5 can move left and right. The left end surface of the sliding column 5 is an arc-shaped arch surface. The swing rod 4 is arranged between the sliding column 5 and the limiting push block 2. The swing rod 4 is vertically arranged. The upper end of the swing rod 4 is connected to the housing 1 through a rotating shaft 4-1. The rotating shaft 4-1 is arranged in the front-back direction. The lower part of the swing rod 4 bends towards the left end of the housing 1. The left and right side surfaces of the swing rod 4 are respectively abutted against the right end of the limiting boss 2-1 and the top of the arc-shaped arch surface. The second return spring 6 is horizontally arranged in the left-right direction. The left end surface of the second return spring 6 abuts against the right end surface of the sliding column 5, and the right end surface of the second return spring 6 abuts against the inner wall of the right end of the housing 1;

[0017] The contact system includes a moving contact mechanism and a static contact structure. The moving contact mechanism includes two cylindrical surface conductive rings 7 sleeved on the outer wall of the sliding column 5. The two cylindrical surface conductive rings 7 are insulated from each other and arranged at intervals along the column direction. The static contact mechanism includes four conductive sleeves 9 and four conductive annular springs 8. An annular groove is provided on the inner wall of the conductive sleeve 9. The size of the annular groove matches the outer diameter of the conductive annular spring 8. The conductive annular spring 8 is accommodated in the annular groove. The conductive sleeve 9 is fixed on the inner wall of the housing 1. The four conductive sleeves 9 are insulated from each other and arranged at intervals in the left-right direction. Each conductive sleeve 9 is electrically connected to the corresponding cable in the signal output cable group 10 by crimping. The sliding column 5 passes through the conductive sleeve 9.

[0018] The travel switch of this embodiment provides a set of normally closed contacts and a set of normally open contacts. Since the abutment between the moving contact and the static contact adopts the way of elastic ring sleeving on the cylindrical surface, the contact area is greatly increased, the contact resistance is reduced, and thus the contact reliability of the product contacts is improved. This travel switch adopts a swing rod transmission, utilizes the lever principle, is suitable for the structural design of travel switches with equal height and large stroke, and is also suitable for the design of travel switches with equal stroke and short height structure, with stronger adaptability.

Claims

1. A travel switch with an independent compensation contact surface change contact, comprising a housing, an operating head, a transmission mechanism, a contact system, and a signal output cable group, characterized in that the operating head includes a push block vertically arranged at one end of the housing. The push block is slidably installed in a through hole opened on the housing. The top end of the push block is the workpiece contact end and protrudes outside the housing. A limiting boss is provided on the outer wall of the bottom of the push block. A vertical first return spring is provided between the bottom end surface of the push block and the housing. the transmission mechanism is arranged inside the housing. The transmission mechanism includes a swing rod, a sliding column, and a second return spring connected in sequence. The sliding column is horizontally arranged in the left-right direction and can move left and right under the restraint of the inner wall of the housing. The swing rod is arranged between the sliding column and the push block. The swing rod is vertically arranged. The upper end of the swing rod is connected to the housing through a rotating shaft. The rotating shaft is perpendicular to the sliding column. The lower part of the swing rod bends towards the push block. The two side surfaces of the swing rod respectively abut against the limiting boss and the sliding column. The second return spring is horizontally arranged in the left-right direction. One end surface of the second return spring abuts against the end surface of the sliding column, and the other end surface abuts against the inner wall of the housing. the contact system includes a moving contact mechanism and a static contact mechanism. The moving contact mechanism includes a plurality of cylindrical surface conductive rings sleeved on the outer wall of the sliding column. The cylindrical surface conductive rings are insulated from each other and arranged at intervals along the column direction. The static contact mechanism includes a plurality of conductive sleeves and a corresponding number of conductive annular springs. An annular groove is provided on the inner wall of the conductive sleeve. The size of the annular groove matches the outer diameter of the conductive annular spring. The conductive annular spring is accommodated in the annular groove. The conductive sleeves are fixed on the inner wall of the housing. The conductive sleeves are insulated from each other and arranged at intervals in the left-right direction. Each conductive sleeve is electrically connected to a corresponding cable in the signal output cable group. The sliding column penetrates through the conductive sleeves.

2. The travel switch with an independent compensation contact surface change contact according to claim 1, characterized in that, There are 4 conductive sleeves.

3. The travel switch with an independent compensation contact surface change contact according to claim 1, characterized in that, The conductive sleeves are electrically connected to the cables of the signal output cable group by means of connector crimping connection.

4. The travel switch with an independent compensation contact surface change contact according to claim 1, characterized in that, One end surface of the sliding column is an arc-shaped arch surface, and the arc-shaped arch surface abuts against the side surface of the swing rod.

5. The travel switch with an independent compensation contact surface change contact according to claim 1, characterized in that, A sealing ring is provided in the through hole.

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