Pull-cord switch control box

Abstract

The utility model discloses a pull cord switch control box, which comprises a bottom plate and a travel switch fixedly connected above the bottom plate, the travel switch is detachably connected with a heating element, one side close to a contact of the travel switch is provided with a large-elasticity torsion spring, one end of the large-elasticity torsion spring is mounted on the bottom plate, and the other end of the large-elasticity torsion spring is mounted on a pull rod. The first bolt is sleeved with the large-elasticity torsional spring and the upper end of the pull rod, the lower end of the pull rod is connected with the pull rope, and the other end of the pull rope is steered through the steering structure and extends downwards. According to the utility model, the large-elasticity torsional spring is adopted, the elasticity of the large-elasticity torsional spring is increased from 2N to 35N, and the pull rod can be pushed by virtue of the strong elasticity, so that the travel switch can be timely and stably rebounded to an initial state; through the arrangement of the heating element, the heating element continuously works to generate heat in a severe environment with high moisture and low temperature, such as a refrigeration house, so that the key position of the travel switch is effectively prevented from being frozen, and the problem of rebound failure caused by freezing is avoided.

Description

Technical Field

[0001] This utility model relates to the field of switch technology, specifically a pull cord switch control box. Background Technology

[0002] In industrial production and related applications, pull-cord switches play a crucial role as important control components. Currently, the most common pull-cord switches on the market are of two types: domestically produced and imported. However, both have revealed significant problems in actual use.

[0003] Existing domestic limit switches have insufficient rebound force. When the installation height is too high, the length of the bottom suspension rope is too long, or moisture and water ingress increase the weight, which can cause rebound failure. Existing imported pull ring limit switches, although they have sufficient rebound force, lack heating function. In environments with high humidity and low temperature, such as cold storage, the critical parts of the limit switch will freeze after long-term operation, causing rebound failure. Utility Model Content

[0004] The purpose of this utility model is to provide a pull-cord switch control box to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A pull-cord switch control box includes a base plate and a limit switch fixedly connected thereto. A heating element is detachably connected to the limit switch. A large-elasticity torsion spring is provided on the side near the limit switch contacts. One end of the large-elasticity torsion spring is mounted on the base plate, and the other end is mounted on a pull rod. The upper ends of the large-elasticity torsion spring and the pull rod are sleeved on a first bolt. The lower end of the pull rod is connected to a pull cord. The other end of the pull cord is turned and extends downward through a steering structure. The steering structure is located on the side of the pull rod near the limit switch. By pulling the pull cord, the pull rod is moved toward the limit switch. The pull rod presses the contacts to control the opening and closing of the limit switch.

[0007] As a further embodiment of this utility model: multiple mounting holes are provided on the base plate, and a snap-fit ​​groove is provided on the side of the pull rod near the limit switch. One end of the large-elasticity torsion spring is inserted into the mounting hole, and the other end is snapped into the snap-fit ​​groove.

[0008] As a further aspect of this utility model, the elastic force of the high-elasticity torsion spring is 35N.

[0009] As a further embodiment of this utility model: a limiting groove is provided on the outside of the pull rod, the pull rod is slidably connected to the limiting groove, and the limiting groove is fixedly connected to the base plate.

[0010] As a further embodiment of this utility model: the steering structure includes a mounting plate, a second bolt, a second nut and a roller bushing. The mounting plate is fixedly connected to the base plate. The second bolt passes through the base plate and the mounting plate and is threadedly connected to the second nut. The roller bushing is fitted on the second bolt.

[0011] As a further embodiment of this utility model, it also includes a cover structure mounted on the base plate. The cover structure consists of a cover plate, a waterproof connector, a gasket, and a sealing coil. An installation hole is provided on the side wall of the cover plate, and a waterproof connector is detachably connected to the installation hole on the side wall. The waterproof connector allows the power cords of the limit switch and the heating element to pass through. An installation hole is provided on the bottom wall of the cover plate, and a gasket is fixedly connected to the inside of the installation hole on the bottom wall. A sealing coil is snapped into the installation hole on the bottom wall, and the sealing coil allows the pull rope to pass through.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: A pull-cord switch control box adopts a high-elasticity torsion spring, whose elasticity is increased from the traditional 2N to 35N. Even when the installation height is high, the pull cord is too long, or the pull cord becomes heavier due to moisture, it can still push the pull rod with strong elasticity to ensure that the limit switch rebounds to the initial state in a timely and stable manner. Through the heating element, in harsh environments such as cold storage with high humidity and low temperature, the heating element continuously works to generate heat, effectively preventing the critical position of the limit switch from freezing and avoiding the problem of rebound failure caused by freezing. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of a pull-cord switch control box.

[0014] Figure 2 This is a schematic diagram of the internal structure of a pull-cord switch control box.

[0015] Figure 3 This is a schematic diagram of the cover structure in a pull-cord switch control box.

[0016] In the diagram: Base plate 1, Mounting hole 11, Limit switch 2, Contact 21, Heating element 3, High-elasticity torsion spring 4, Pull rod 5, Snap-fit ​​groove 51, First bolt 6, Pull rope 7, Steering structure 8, Mounting plate 81, Second bolt 82, Second nut 83, Roller bushing 84, Limiting groove 9, Cover structure 10, Cover plate 101, Waterproof connector 102, Pad plate 103, Sealing coil 104. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Please see Figures 1-3 In this embodiment of the invention, a pull-cord switch control box includes a base plate 1 and a limit switch 2 fixedly connected to it. A heating element 3 is detachably connected to the limit switch 2. A large-elasticity torsion spring 4 is provided near the contact 21 of the limit switch 2. One end of the large-elasticity torsion spring 4 is mounted on the base plate 1, and the other end is mounted on a pull rod 5. The upper ends of the large-elasticity torsion spring 4 and the pull rod 5 are sleeved on a first bolt 6. The lower end of the pull rod 5 is connected to a pull cord 7. The other end of the pull cord 7 is turned and extends downward via a steering structure 8. The steering structure 8 is located on the side of the pull rod 5 near the limit switch 2. By pulling the pull cord 7, the pull rod 5 moves towards the limit switch 2, and the pull rod 5 presses the contact 21 to control the opening and closing of the limit switch 2. By installing a heating element 3 on the limit switch 2, the problem of the limit switch freezing at critical positions after long-term use in environments with high humidity and low temperature, such as cold storage, is avoided, which could lead to rebound failure.

[0019] Specifically, the base plate 1 has multiple mounting holes 11, and the pull rod 5 has a snap-fit ​​groove 51 on the side near the limit switch 2. One end of the high-elasticity torsion spring 4 is inserted into the mounting hole 11, and the other end is snapped into the snap-fit ​​groove 51. To avoid the problem of insufficient spring force and rebound failure in the prior art, this utility model adopts a high-elasticity torsion spring 4. The spring force of the high-elasticity torsion spring 4 is increased from 2N in the prior art to 35N, which greatly improves the rebound effect.

[0020] The pull rod 5 is provided with a limiting groove 9, and the pull rod 5 is slidably connected to the limiting groove 9. The limiting groove 9 is fixedly connected to the base plate 1.

[0021] The steering structure 8 includes a mounting plate 81, a second bolt 82, a second nut 83, and a roller bushing 84. The mounting plate 81 is fixedly connected to the base plate 1. The second bolt 82 passes through the base plate 1 and the mounting plate 81 and is threadedly connected to the second nut 83. The roller bushing 84 is fitted on the second bolt 82.

[0022] A pull-cord switch control box further includes a cover structure 10 mounted on a base plate 1. The cover structure 10 consists of a cover plate 101, a waterproof connector 102, a pad 103, and a sealing coil 104. A mounting hole is provided on the side wall of the cover plate 101, and the waterproof connector 102 is detachably connected to the mounting hole. The waterproof connector 102 allows the power lines of the limit switch 2 and the heating element 3 to pass through. A mounting hole is provided on the bottom wall of the cover plate 101, and the pad 103 is fixedly connected to the inside of the mounting hole. The sealing coil 104 is snapped into the mounting hole, and the sealing coil 104 allows the pull cord 7 to pass through.

[0023] The working principle of this utility model is as follows: When the pull cord switch control box is working, pulling the pull cord 7 causes the pull cord 7 to change direction via the steering structure 8, driving the connected pull rod 5 to move towards the limit switch 2. During this process, the large-elasticity torsion spring 4 is compressed. When the pull rod 5 touches the contact 21 of the limit switch 2, the state of the limit switch 2 changes, realizing the circuit switching to control the operation of related equipment. After the pull cord 7 is released, the large-elasticity torsion spring 4 pushes the pull rod 5 to move in the opposite direction with its strong elasticity, so that the limit switch 2 returns to its initial state. During the movement, the pull rod 5 is constrained by the limiting slide groove 9 to ensure stable and accurate movement. At the same time, the waterproof connector 102 of the box cover structure 10 protects the power cords of the limit switch 2 and the heating element 3, and the sealing coil 104 prevents moisture, dust and other impurities from entering the control box through the pull cord 7, ensuring the normal working environment of the internal electronic components. In low-temperature and high-humidity environments such as cold storage, the heating element 3 generates heat during operation, preventing the critical position of the limit switch 2 from freezing.

[0024] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A pull-cord switch control box, comprising a base plate (1) and a limit switch (2) fixedly connected thereto, characterized in that, A heating element (3) is detachably connected to the limit switch (2). A large elastic torsion spring (4) is provided on the side near the contact (21) of the limit switch (2). One end of the large elastic torsion spring (4) is installed on the base plate (1), and the other end is installed on the pull rod (5). The upper ends of the large elastic torsion spring (4) and the pull rod (5) are sleeved on the first bolt (6). The lower end of the pull rod (5) is connected to the pull rope (7). The other end of the pull rope (7) is turned by the steering structure (8) and extends downward. The steering structure (8) is located on the side of the pull rod (5) near the limit switch (2). By pulling the pull rope (7), the pull rod (5) is driven to move towards the limit switch (2). The pull rod (5) presses the contact (21) to control the opening and closing of the limit switch (2).

2. The pull-cord switch control box according to claim 1, characterized in that, The base plate (1) has multiple mounting holes (11), and the pull rod (5) has a snap-fit ​​groove (51) on the side near the limit switch (2). One end of the large elastic torsion spring (4) is inserted into the mounting hole (11), and the other end is snapped into the snap-fit ​​groove (51).

3. A pull-cord switch control box according to claim 2, characterized in that, The elastic force of the high-elasticity torsion spring (4) is 35N.

4. A pull-cord switch control box according to claim 3, characterized in that, The pull rod (5) is provided with a limiting groove (9), and the pull rod (5) is slidably connected to the limiting groove (9). The limiting groove (9) is fixedly connected to the base plate (1).

5. A pull-cord switch control box according to claim 4, characterized in that, The steering structure (8) includes a mounting plate (81), a second bolt (82), a second nut (83), and a roller bushing (84). The mounting plate (81) is fixedly connected to the base plate (1). The second bolt (82) passes through the base plate (1) and the mounting plate (81) and is threaded with the second nut (83). The roller bushing (84) is fitted on the second bolt (82).

6. A pull-cord switch control box according to claim 1, characterized in that, It also includes a cover structure (10) installed on the base plate (1). The cover structure (10) consists of a cover plate (101), a waterproof connector (102), a pad (103), and a sealing coil (104). A mounting hole is provided on the side wall of the cover plate (101). A waterproof connector (102) is detachably connected to the mounting hole on the side wall. The waterproof connector (102) allows the power cords of the limit switch (2) and the heating element (3) to pass through. A mounting hole is provided on the bottom wall of the cover plate (101). A pad (103) is fixedly connected to the inside of the mounting hole on the bottom wall. A sealing coil (104) is snapped into the mounting hole on the bottom wall. The sealing coil (104) allows the pull rope (7) to pass through.

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