Stretching type travel switch

Abstract

The utility model discloses a stretching type travel switch which comprises an outer shell, the outer shell is arranged in a penetrating mode, a base is arranged at the bottom in the outer shell, a positioning frame is further fixedly arranged in the outer shell, a wire is arranged on the positioning frame, and the wire is led into the base and connected with a cable. A contact reed group is fixedly arranged on the positioning frame and is electrically communicated with the wire; a second pull rod is arranged in the positioning frame in a sliding mode and is composed of a contact part and a stretching part, the contact part is arranged in the positioning frame in a sliding and penetrating mode, a first conductive part and a second conductive part are arranged at the two ends of the contact part respectively, and the end, away from the contact part, of the stretching part penetrates out of the opening end of the outer shell in a sliding mode. The outer part of the stretching part and the inner part of the outer shell are also jointly provided with an elastic assembly, and the elastic assembly is used for being matched with the second pull rod to achieve circuit switching; the on-off-on conversion process of the circuit is realized, the overall structure is small in appearance, and the measuring range of the travel switch is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of travel switch, especially a stretch type travel switch. BACKGROUND

[0002] Travel switch is a commonly used small current master electric appliance, and is the most commonly used mechanical switch, which is widely used in industrial equipment, and the travel switch drives the conversion of internal contact through stretching, so as to achieve the purpose of connecting or breaking the circuit and controlling the movement of electric objects.

[0003] The main function of the travel switch is to convert the mechanical displacement of the moving object into an electrical signal, so that the running state of the electric motor driving the object movement can be changed, thereby playing a role in controlling the action of the electric object or being used for the program control of the electric object.

[0004] In the travel switch, a switch is specifically a stretch type switch, when the stretch travel needs to be realized to achieve the circuit connection or breaking, the overall length of the product is increased to realize it, the overall structure is relatively space-occupying, and even due to the relatively long overall length, the internal structure sealing is not strong, thereby affecting the use performance of the travel switch. UTILITY MODEL CONTENTS

[0005] To solve the above technical problems, the utility model provides a stretch type travel switch.

[0006] The utility model is realized through the following technical schemes.

[0007] The utility model provides a stretch type travel switch, including the shell body, the shell body is through setting, the bottom in the shell body is provided with the base, the shell body is still fixedly provided with the positioning frame in, the positioning frame is provided with the wire, the wire is introduced into the base and is connected with the cable;

[0008] The positioning frame is fixedly provided with the contact spring group, and the contact spring group is in electrical communication with the wire.

[0009] The positioning frame is slidably provided with the pull rod B, the pull rod B is composed of the contact part and the stretch part, the contact part is slidably arranged in the positioning frame, both ends of the contact part are provided with the electrically conductive part A and the electrically conductive part B, the end of the stretch part away from the contact part is slidably arranged out of the opening end of the shell body, the inside of the stretch part is provided with the stretch assembly, for pulling the pull rod B to realize circuit switching, and the outside of the stretch part and the inside of the shell body are also provided with the elastic assembly, for realizing circuit switching in cooperation with the pull rod B.

[0010] Preferably, the elastic assembly comprises a first limiting boss, a metal bushing and a compression spring, the first limiting boss is integrally connected to the end of the stretching part close to the contact part, the metal bushing is fixedly arranged in the outer shell close to the opening end, one end of the compression spring is connected to the first limiting boss and the other end is connected to the metal bushing, and the compression spring is sleeved on the pull rod b.

[0011] Preferably, the stretching assembly comprises a pull rod a, the end of the pull rod a close to the opening end of the outer shell is provided with a containing groove, the containing groove is provided with a limiting block at the opening end, one end of the pull rod a is slidingly arranged in the containing groove and the other end is arranged outside the containing groove, the compression spring a is sleeved on the pull rod a, one end of the pull rod a close to the bottom of the containing groove is fixedly connected with the compression spring a, and the other end of the compression spring a is fixedly connected to the limiting block, and the elastic force of the compression spring a is greater than the elastic force of the compression spring b.

[0012] Preferably, the inner part of the opening end of the outer shell is provided with a fluoroplastic bushing, and the fluoroplastic bushing is in abutment with the metal bushing.

[0013] Preferably, the contact spring group is composed of a plurality of contact springs, and the plurality of contact springs are distributed along the circumferential direction of the inner side wall of the positioning frame.

[0014] Preferably, the contact spring is a spatial curved surface design, and the convex surface of the contact spring faces the outer peripheral side of the contact part.

[0015] Preferably, the inner part of the base is provided with an epoxy resin glue layer.

[0016] Preferably, the pull rod b is provided with an E-shaped clamp spring.

[0017] The beneficial effects of the utility model lie in that: in the initial state, the conductive part a is in contact with the contact spring group, the first group of circuits is in the communication state, the pull rod a is pulled to drive the pull rod b to move, the initial elastic force of the compression spring a is greater than that of the compression spring b, the compression spring b is compressed, the conductive part a is staggered with the contact spring group, the conductive part a is disconnected with the contact spring group, the pull rod a is continuously pulled, the elastic force of the compression spring b is gradually increased, when the elastic force of the compression spring b is greater than the initial elastic force of the compression spring a, the compression spring a is compressed, the pull rod a is stretched out of the outer shell, the contact spring group is in contact with the conductive part b, the second group of circuits is in the communication state, the pull rod a is loosened, under the joint force of the compression spring a and the compression spring b, the pull rod a and the pull rod b are pushed to restore to the original position, return to the initial state, the first group of circuits is communicated, the conversion process of circuit on-off-on is realized, the range of the travel switch is prolonged, the overall structure is small in appearance, the structure is shortened in length, the stretching stroke is long, the internal part also has the sealing function, the use performance of the switch is guaranteed, the switch is wider in application range and better in environmental adaptability. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is the structure schematic view of the utility model;

[0019] Figure 2 is a part structure schematic view of the utility model for showing pull rod B, contact set, E type clasp, conductive part A and conductive part B etc. structure;

[0020] Figure 3 is the utility model's circuit principle diagram;

[0021] In the drawing: 1 - outer shell;2 - base;3 - positioning frame;4 - wire;5 - cable;6 - pull rod B;61 - contact part;62 - stretch part;7 - conductive part A;8 - conductive part B;9 - first limit boss;10 - metal bushing;11 - compression spring B;12 - pull rod A;13 - compression spring A;14 - limit block;15 - second limit boss;16 - accommodating groove;17 - fluorine plastic bushing;18 - contact spring;19 - epoxy resin adhesive layer;20 - E type clasp;21 - contact set. DETAILED DESCRIPTION

[0022] The technical scheme in the embodiments of the utility model will be apparently and completely described below with reference to the drawings in the embodiments of the utility model, obviously, the described embodiments are only a part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without making creative labor belong to the range of protection of the utility model.

[0023] It should be noted that all directionality indications (such as up, down, left, right, front, back...) in the embodiments of the utility model are only used to explain the relative position relationship, movement condition etc. between components in a certain specific posture (as shown in the drawings), if the specific posture changes, the directionality indications also change accordingly.

[0024] In the embodiment, refer to Figure 1 , including outer shell 1, outer shell 1 is through setting, the bottom of the outer shell 1 is fixedly connected with base 2, the bottom of base 2 is through, convenient for leading out cable 5, the outer shell 1 is also fixedly connected with positioning frame 3, positioning frame 3 is provided with wire 4, wire 4 is introduced into base 2 and is connected with cable 5, base 2 is provided with epoxy resin adhesive layer 19 in the inside, the part cable 5 and wire 4 in base 2 are glued and fixed, the other end of cable 5 is out of the bottom of base 2, convenient for connecting other conductive components, also convenient for separating the inside of outer shell 1 and the outside;

[0025] Positioning frame 3 is fixedly connected with contact spring group, contact spring group is composed of multiple contact springs 18, multiple contact springs 18 are distributed along the circumferential direction of positioning frame 3, contact spring group is electrically communicated with wire 4, positioning frame 3 is slidably provided with pull rod B 6.

[0026] In the embodiment, refer toFigure 1 and Figure 2 The pull rod B 6 is composed of a contact part 61 and a stretching part 62, the contact part 61 is slid through the positioning frame 3, the contact part 61 is sleeved with a contact sleeve 21, the contact part 61 is provided with two clamping grooves, the E-shaped clamping spring 20 is clamped in the clamping grooves, the contact sleeve 21 is limited and fixed on the contact part 61, and the two ends of the contact sleeve 21 are respectively provided with the electrically-conductive part A 7 and the electrically-conductive part B 8.

[0027] The contact spring 18 is designed as a spatial curved surface, the convex surface of the contact spring 18 faces the outer peripheral side of the contact part 61, which is helpful for contacting the electrically-conductive part A 7 and the electrically-conductive part B 8, and avoids scratching in the contacting process, and has a certain protective effect on the contact points between each other.

[0028] The end of the stretching part 62 away from the contact part 61 is slid through the opening end of the outer shell 1, the stretching part 62 is provided with a stretching assembly inside, which is used for pulling the pull rod B 6 to realize circuit switching, and the outer part of the stretching part 62 and the inner part of the outer shell 1 are further provided with an elastic assembly, which is used for cooperating with the pull rod B 6 to realize circuit switching.

[0029] In the embodiment, referring to Figure 1 The elastic assembly includes a first limiting boss 9, a metal bushing 10 and a compression spring B 11, the first limiting boss 9 is integrally connected to the end of the stretching part 62 close to the contact part 61, the metal bushing 10 is fixedly arranged in the outer shell 1 close to the opening end, the inner part of the opening end of the outer shell 1 is provided with a fluoroplastic bushing 17, which is sealingly arranged on the inner side of the opening end of the outer shell 1, the fluoroplastic bushing 17 abuts against the metal bushing 10, so that the metal bushing 10 is stably arranged in the outer shell 1, and the sealing performance of the whole structure is enhanced; one end of the compression spring B 11 is connected to the first limiting boss 9, the other end is connected to the metal bushing 10, and the compression spring B 11 is further sleeved on the pull rod B 6, so that the compression spring B 11 can be conveniently stretched and contracted.

[0030] In the embodiment, referring to Figure 1The stretching assembly comprises a pull rod A 12, the pull rod B 6 is provided with a containing groove 16 at one end close to the opening of the outer shell 1, one end of the pull rod A 12 is slidingly arranged in the containing groove 16, the opening end of the containing groove 16 is provided with a limiting block 14, the second limiting boss 15 is integrally formed at one end of the pull rod A 12 arranged in the containing groove 16, the second limiting boss 15 is slidingly arranged in the containing groove 16, and the second limiting boss 15 is limited in the containing groove 16 by the limiting block 14; the other end of the pull rod A 12 penetrates out of the containing groove 16, the pull rod A 12 is sleeved with a compression spring A 13, one end of the compression spring A 13 is fixed on the second limiting boss 15, the other end of the compression spring A 13 abuts against the limiting block 14, the compression spring A 13 is convenient to stretch and contract, the elastic force of the compression spring A 13 is greater than the elastic force of the compression spring B 11, when the pull rod A 12 is pulled by an external force, the pull rod A 12 remains stationary in the containing groove 16, so that the pull rod A 12 drives the pull rod B 6 to move, and the contact spring 18 and the conductive part A 7 are disconnected, when the pull rod A 12 is pulled by a greater external force, the external force is greater than the elastic force of the compression spring A 13, the pull rod A 12 is pulled, the pull rod B 6 is prevented from being excessively stretched, and the pull rod B 6 is protected.

[0031] In the embodiment, referring to Figure 1 , by pulling the pull rod A 12, the circuit presents multiple states, the multiple circuit states are shown in the figure, the lead-out lines of the travel switch 1, 2, 3 are a first group of control circuits, wherein the 1 foot is an input end of the first group of control circuits, and the 2 foot and the 3 foot are output ends; the lead-out lines of the travel switch 4, 5, 6 are a second group of control circuits, wherein the 4 foot is an input end of the second group of control circuits, and the 5 foot and the 6 foot are output ends, when the pull rod A 12 is not moved, the first group of control circuits is connected, when the pull rod A 12 is moved in the middle, the first group of control circuits and the second group of control circuits are both in a disconnected state, when the pull rod A 12 pulls the pull rod B 6 to a certain stroke, the second group of control circuits is connected, and the switching of the two groups of circuits is realized.

[0032] The working principle of the embodiment is as follows: in the initial state, the conductive part A 7 is in contact with the contact spring 18 group, the first group of circuits is in a communication state, the pull rod A 12 is pulled to move the pull rod B 6, the initial elastic force of the compression spring A 13 is greater than that of the compression spring B 11, the compression spring B 11 is compressed, the conductive part A 7 is disengaged from the contact spring 18 group, and the conductive part A 7 is disconnected from the contact spring 18 group. Continue to pull the pull rod A 12, so that the elastic force of the compression spring B 11 gradually increases, when the elastic force of the compression spring B 11 is greater than the initial elastic force of the compression spring A 13, the compression spring A 13 is compressed, the pull rod A 12 is stretched out of the shell body 1, so that the contact spring 18 group is in contact with the conductive part B 8, the second group of circuits is in a communication state, the pull rod A 12 is released, and the pull rod A 12 and the pull rod B 6 are pushed to the original position under the combined action of the compression spring A 13 and the compression spring B 11, returning to the initial state, the first group of circuits is connected, realizing the conversion process of circuit on-off-on, prolonging the range of the travel switch, the overall structure is small, the stretching stroke is long, and the internal sealing function is also provided, guaranteeing the use performance of the switch, so that the switch can be applied to a wider range and has better environmental adaptability.

[0033] The above is only the preferred embodiment of the utility model, and does not limit the patent range of the utility model, and any equivalent structural transformation, direct / indirect application in other related technical fields under the concept of the utility model, and the contents of the utility model specification and drawings are included in the patent protection range of the utility model.

Claims

1. A stretch-type limit switch, characterized in that: Includes an outer shell (1), which is through-hole, and a base (2) is provided at the bottom inside the outer shell (1). A positioning frame (3) is also fixedly provided inside the outer shell (1). A wire (4) is provided on the positioning frame (3). The wire (4) is introduced into the base (2) and connected to a cable (5). A contact spring assembly is fixedly installed on the positioning frame (3), and the contact spring assembly is electrically connected to the wire (4); A pull rod (6) is slidably disposed inside the positioning frame (3). The pull rod (6) consists of a contact part (61) and a tension part (62). The contact part (61) is slidably disposed in the positioning frame (3). Conductive component A (7) and conductive component B (8) are respectively disposed at both ends of the contact part (61). The end of the tension part (62) away from the contact part (61) is slidably disposed through the opening end of the outer shell (1). A tensioning component is disposed inside the tension part (62) for pulling the pull rod (6) to realize circuit switching. An elastic component is also disposed on the outside of the tension part (62) and inside the outer shell (1) for cooperating with the pull rod (6) to realize circuit switching.

2. A stretch-type limit switch as described in claim 1, characterized in that: The elastic component includes a first limiting boss (9), a metal bushing (10), and a compression spring (11). The first limiting boss (9) is integrally connected to the end of the tension part (62) near the contact part (61). The metal bushing (10) is fixedly installed inside the outer shell (1) near the opening end. One end of the compression spring (11) is connected to the first limiting boss (9), and the other end is connected to the metal bushing (10). At the same time, the compression spring (11) is also sleeved on the pull rod (6).

3. A stretch-type limit switch as described in claim 1, characterized in that: The tensioning assembly includes a pull rod A (12), which has a receiving groove (16) at the end near the opening of the outer shell. The opening of the receiving groove (16) is provided with a limiting block (14). One end of the pull rod A (12) is slidably disposed in the receiving groove (16), and the other end is placed outside the receiving groove (16). A compression spring A (13) is sleeved on the pull rod A (12). One end of the pull rod A (12) near the bottom of the receiving groove (16) is fixedly connected to the compression spring A (13), and the other end of the compression spring A (13) is fixedly connected to the limiting block (14). The elastic force of the compression spring A (13) is greater than the elastic force of the compression spring B (11).

4. A stretch-type limit switch as described in claim 2, characterized in that: The inside of the opening end of the outer shell (1) is provided with a fluoroplastic bushing (17), which abuts against the metal bushing (10).

5. A stretch-type limit switch as described in claim 1, characterized in that: The contact spring group consists of multiple contact springs (18), which are distributed circumferentially along the inner wall of the positioning frame (3).

6. A stretch-type limit switch as described in claim 5, characterized in that: The contact spring (18) is designed with a spatial curved surface, and the convex surface of the contact spring (18) faces the outer periphery of the contact part (61).

7. A stretch-type limit switch as described in claim 1, characterized in that: An epoxy resin adhesive layer (19) is provided inside the base (2).

8. A stretch-type limit switch as described in claim 1, characterized in that: An E-type snap ring (20) is provided on the tie rod (6).

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