A travel switch

Abstract

The utility model relates to a travel switch, including a shell tube, a pressure cap and a positioning sleeve, wherein one end of the pressure cap is open and the other end is closed, the open end of the pressure cap extends into the shell tube, the positioning sleeve is screwed into the shell tube, a first spring, a first pressure column, a second pressure column, a normally closed contact piece and a normally open contact piece are arranged in the shell tube, the first spring is clamped between the positioning sleeve and the open end of the pressure cap, a second spring is arranged in the pressure cap, the second spring is clamped between the closed end of the pressure cap and one end of the first pressure column, the other end of the first pressure column is fixedly connected to one end of the second pressure column, the other end of the second pressure column is provided with a conductive ring and an insulating ring, the normally closed contact piece abuts against the surface of the conductive ring, and the normally open contact piece abuts against the surface of the insulating ring. By adopting the technical solution provided by the utility model, by setting two springs, the pressing stroke of the travel switch is increased, and the external volume of the travel switch is reduced, and at the same time, the deformation of the two springs can be avoided from overtravel, thereby extending the service life of the travel switch.

Description

Technical Field

[0001] The utility model belongs to the technical field of travel switches, in particular to a travel switch. Background Art

[0002] A travel switch is a fast-changing switch actuated by pressure. Because the contact spacing of the switch is relatively small, common travel switches generally include a trigger device and an electrical switching device. The trigger device is used to transmit external force to the electrical switching device, and the electrical switching device is used to achieve switching of the electrical connection state.

[0003] For example, the patent document with the publication number "CN106128807B" discloses a travel switch trigger device and a travel switch module using the device, wherein the travel switch trigger device includes a bracket swingably equipped with a force transmission member, the force transmission member has an avoidance groove, and the avoidance groove is close to the two groove walls close to the notch to form a first contour surface for pressing the trigger button of the travel switch and a second contour surface symmetrical about the first symmetry plane, the rotation axis of the force transmission member is on the first symmetry plane, the force transmission member also has a first contact portion in contact with the trigger member and a second contact portion symmetrical about the second symmetry plane; the force transmission member has a free position, a first direction trigger position and a second direction trigger position opposite to the first direction trigger position, and the travel switch device also includes a reset mechanism for resetting the force transmission member from the first and second direction trigger positions to the free position. This patented technology realizes the two-way same-position triggering of the travel switch.

[0004] However, existing travel switches usually use the deformation of the spring to achieve switching between electrical connection states. The deformation stroke of the spring determines the pressing stroke of the travel switch. If the pressing stroke of the travel switch is to be increased, the deformation stroke of the spring needs to be increased, which will increase the size of the travel switch accordingly. If the operator presses the travel switch too hard, causing the spring deformation stroke to exceed its limit stroke, the spring elasticity will fail, affecting the service life of the spring. If the spring elasticity fails, the reliability of the travel switch will be affected. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides a travel switch.

[0006] The utility model provides a travel switch, which includes a shell cylinder, a compression cap and a positioning sleeve. One end of the compression cap is open and the opposite end is closed. The open end of the compression cap extends into the shell cylinder. The positioning sleeve is screwed inside the shell cylinder. Inside the shell cylinder, there are a first spring, a first pressing column, a second pressing column, a normally closed contact piece and a normally open contact piece. And the first spring is clamped between the positioning sleeve and the open end of the compression cap. There is a second spring inside the compression cap, and the second spring is clamped between the closed end of the compression cap and one end of the first pressing column. The other end of the first pressing column is fixedly connected to one end of the second pressing column. The other end of the second pressing column is provided with a conductive ring and an insulating ring. At least one end of the normally closed contact piece abuts against the surface of the conductive ring. At least one end of the normally open contact piece abuts against the surface of the insulating ring.

[0007] The open end of the compression cap is also riveted together with a limit ring, and the first pressing column penetrates through the limit ring.

[0008] There is also a sealing ring inside the shell cylinder, and the sealing ring is clamped between the outer surface of the compression cap and the shell cylinder.

[0009] There is also a guide sleeve inside the shell cylinder, and the guide sleeve is clamped between the first spring and the positioning sleeve. The second pressing column also penetrates through the guide sleeve.

[0010] There is also a guide ring inside the shell cylinder, and the guide ring is clamped between the inner surface of the guide sleeve and the outer surface of the second pressing column.

[0011] There is also a limit platform on the outer surface of the second pressing column.

[0012] The axial cross-section of the guide sleeve is integrally in a shape of a capital "J".

[0013] The shell cylinder is also screwed to a seat cylinder, and the seat cylinder is fixedly connected to an insulating base. The normally closed contact piece and the normally open contact piece are both fixedly connected to the insulating base together.

[0014] The normally closed contact piece and the normally open contact piece are also respectively fixedly connected to one end of a wire, and the other end of the wire extends outside the seat cylinder.

[0015] There is also sealing glue filled inside the seat cylinder.

[0016] The beneficial effect of the utility model is that: by adopting the technical scheme provided by the utility model, two springs are arranged in the shell tube, and the pressing stroke of the travel switch depends on the sum of the elastic deformation strokes of the two springs, thereby minimizing the external volume of the travel switch on the basis of increasing the pressing stroke of the travel switch, and when the operator presses the pressure cap, the first spring is compressed first, and when the end of the second pressure column abuts against the surface of the insulating base, the second spring is compressed again, and accordingly the normally closed contact piece slides from the surface of the conductive ring to the surface of the insulating ring, and the normally closed electrical connection state is switched to the normally open electrical connection state, and the normally open contact piece slides from the surface of the insulating ring to the surface of the conductive ring, and the normally open electrical connection state is switched to the normally open electrical connection state, even if the operator presses too hard, because the operating force is shared by the two springs, the deformation stroke of the first spring and the second spring is prevented from exceeding its limit stroke, thereby extending the service life of the spring, avoiding spring elastic failure, and ensuring the reliability of the travel switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is the front view of the utility model;

[0018] Figure 2 It is a schematic diagram of the connection structure of the pressure cap, the first pressure column, the second pressure column, the conductive ring and the insulating ring of the utility model;

[0019] Figure 3 The utility model is a schematic diagram of the connection structure of the normally closed contact piece, the normally open contact piece and the insulating base.

[0020] In the figure: 1-shell cylinder, 2-pressure cap, 3-positioning sleeve, 4-first spring, 5-first pressure column, 6-second pressure column, 7-normally closed contact, 8-normally open contact, 9-second spring, 10-conductive ring, 11-insulating ring, 12-limiting ring, 13-sealing ring, 14-guide sleeve, 15-guide ring, 16-limiting platform, 17-seat cylinder, 18-insulating base, 19-wire, 20-sealant. DETAILED DESCRIPTION

[0021] The technical solution of the utility model is further described below in conjunction with the accompanying drawings, but the protection scope required is not limited to the above;

[0022] The utility model provides a travel switch, such as Figures 1 to 3As shown, it includes a shell tube 1, a pressure cap 2 and a positioning sleeve 3. One end of the pressure cap 2 is open and the other end is closed. The open end of the pressure cap 2 extends into the shell tube 1. The positioning sleeve 3 is screwed into the shell tube 1. A first spring 4, a first pressure column 5, a second pressure column 6, a normally closed contact 7 and a normally open contact 8 are arranged in the shell tube 1, and the first spring 4 is clamped between the positioning sleeve 3 and the open end of the pressure cap 2. A second spring 9 is arranged in the pressure cap 2, and the second spring 9 is clamped between the closed end of the pressure cap 2 and one end of the first pressure column 5. The other end of the first pressure column 5 is fixedly connected to one end of the second pressure column 6. The other end of the second pressure column 6 is provided with a conductive ring 10 and an insulating ring 11. At least one end of the normally closed contact 7 abuts against the surface of the conductive ring 10, and at least one end of the normally open contact 8 abuts against the surface of the insulating ring 11.

[0023] By adopting the technical solution provided by the utility model, two springs are arranged in the shell tube, and the pressing stroke of the travel switch depends on the sum of the elastic deformation strokes of the two springs. Therefore, on the basis of increasing the pressing stroke of the travel switch, the external volume of the travel switch is minimized. When the operator presses the pressure cap, the first spring is compressed first, and when the end of the second pressure column abuts against the surface of the insulating base, the second spring is compressed again, and accordingly the normally closed contact piece slides from the surface of the conductive ring to the surface of the insulating ring, and the normally closed electrical connection state is switched to the normally open electrical connection state, and the normally open contact piece slides from the surface of the insulating ring to the surface of the conductive ring, and the normally open electrical connection state is switched to the normally open electrical connection state. Even if the operator presses too hard, the operating force is shared by the two springs, so that the deformation strokes of the first spring and the second spring are prevented from exceeding their limit strokes, thereby extending the service life of the springs, avoiding spring elastic failure, and ensuring the reliability of the travel switch.

[0024] Specifically, the open end of the pressure cap 2 is riveted to the limiting ring 12, and the first pressure column 5 passes through the limiting ring 12. In addition, a sealing ring 13 is provided in the shell 1, and the sealing ring 13 is clamped between the outer surface of the pressure cap 2 and the shell 1. Thus, the shell is well sealed to prevent the electrical components in the shell from being oxidized and failing.

[0025] In addition, a guide sleeve 14 is provided in the shell 1, and the guide sleeve 14 is clamped between the first spring 4 and the positioning sleeve 3, and the second pressure column 6 also passes through the guide sleeve 14. When the operator presses the pressure cap 2, the guide sleeve 14 guides the pressure cap 2 to prevent the pressure cap 2 from being affected by the eccentric load. The higher the height of the corresponding guide sleeve 14, the better the guiding effect. A guide ring 15 is also provided in the shell 1, and the guide ring 15 is clamped between the inner surface of the guide sleeve 14 and the outer surface of the second pressure column 6. The guide ring 15 is made of non-metallic material, and also guides the pressure cap 2, and at the same time produces a damping effect on the pressure cap 2. When the operating force pressing the pressure cap 2 is too large, it can slow down the movement speed of the pressure cap 2 and reduce the pressing impact force, thereby ensuring the reliability of the travel switch and effectively extending the service life of the travel switch.

[0026] In addition, a limiting platform 16 is provided on the outer surface of the second pressing column 6. The limiting platform 16 is used to limit the deformation stroke of the second spring 9, so that the deformation stroke of the second spring 9 will not exceed its limit stroke, thereby avoiding the failure of the elasticity of the second spring 9, improving the reliability of the travel switch, and prolonging the service life of the travel switch.

[0027] Specifically, the axial cross-section of the guide sleeve 14 is integrally in a shape like the Chinese character 'ji'. The shell cylinder 1 is also screwed to the seat cylinder 17, and the seat cylinder 17 is also fixedly connected to the insulating base 18. The normally closed contact piece 7 and the normally open contact piece 8 are both fixedly connected to the insulating base 18 together. The normally closed contact piece 7 and the normally open contact piece 8 are also respectively fixedly connected to one end of the wire 19, and the other end of the wire extends outside the seat cylinder 17. A sealant 20 is also filled in the seat cylinder 17. The sealant 20 can adopt epoxy resin glue. When the sealant 20 solidifies, on the one hand, it completely seals the inside of the shell cylinder to prevent the electrical components inside the shell cylinder from being oxidized; on the other hand, the sealant 20 completely and reliably positions the relative positions of the wire, the normally closed contact piece and the normally open contact piece, ensuring the reliability of the travel switch and being beneficial to further prolonging the service life of the travel switch.

Claims

1. A travel switch, characterized in that: It includes a shell cylinder (1), a compression cap (2) and a positioning sleeve (3). One end of the compression cap (2) is open and the opposite end is closed. The open end of the compression cap (2) extends into the shell cylinder (1). The positioning sleeve (3) is screwed inside the shell cylinder (1). Inside the shell cylinder (1), there are a first spring (4), a first pressure column (5), a second pressure column (6), a normally closed contact piece (7) and a normally open contact piece (8). And the first spring (4) is clamped between the positioning sleeve (3) and the open end of the compression cap (2). There is a second spring (9) inside the compression cap (2), and the second spring (9) is clamped between the closed end of the compression cap (2) and one end of the first pressure column (5). The other end of the first pressure column (5) is fixedly connected to one end of the second pressure column (6). There is a conductive ring (10) and an insulating ring (11) at the other end of the second pressure column (6). At least one end of the normally closed contact piece (7) abuts against the surface of the conductive ring (10), and at least one end of the normally open contact piece (8) abuts against the surface of the insulating ring (11).

2. A travel switch according to claim 1, characterized in that: The open end of the compression cap (2) is also riveted to a limit ring (12), and the first pressure column (5) passes through the limit ring (12).

3. A travel switch according to claim 1, characterized in that: There is also a sealing ring (13) inside the shell cylinder (1), and the sealing ring (13) is clamped between the outer surface of the compression cap (2) and the shell cylinder (1).

4. A travel switch according to claim 1, characterized in that: There is also a guide sleeve (14) inside the shell cylinder (1), and the guide sleeve (14) is clamped between the first spring (4) and the positioning sleeve (3). The second pressure column (6) also passes through the guide sleeve (14).

5. A travel switch according to claim 4, characterized in that: There is also a guide ring (15) inside the shell cylinder (1), and the guide ring (15) is clamped between the inner surface of the guide sleeve (14) and the outer surface of the second pressure column (6).

6. A travel switch according to claim 5, characterized in that: There is also a limit platform (16) on the outer surface of the second pressure column (6).

7. A travel switch according to claim 5, characterized in that: The axial cross-section of the guide sleeve (14) is integrally in a shape like the Chinese character 'ji'.

8. A travel switch according to claim 1, characterized in that: The shell cylinder (1) is also screwed to a seat cylinder (17), and the seat cylinder (17) is also fixedly connected to an insulating base (18). The normally closed contact piece (7) and the normally open contact piece (8) are both fixedly connected to the insulating base (18).

9. A travel switch according to claim 8, characterized in that: The normally closed contact piece (7) and the normally open contact piece (8) are also respectively fixedly connected to one end of a wire (19), and the other end of the wire extends outside the seat cylinder (17).

10. A travel switch according to claim 8 or 9, characterized in that: There is also a sealing glue (20) filled inside the seat cylinder (17).

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