Multi-contact travel switch

Abstract

The utility model relates to a kind of multi-contact travel switch, it is mainly constituted by switch body and driving end.The rotary motion of driving end is changed by the position of terminal lug in switch body, realizes the switching function of connector.Driving end is connected with the equipment to be detected by swing arm, the movement state of swing arm can be instantly transmitted to driving end, ensure real-time feedback.In addition, the driving end of the device is designed as a cavity structure, effectively reduce the weight of device, and provide flexibility for the layout of internal components.Driving end's through slot design allows swing arm to move up and down linearly, to realize the accurate control of contact wheel height.The device also includes a spring piece and cam, they act on swing arm together, to control the height of swing arm and ensure that contact wheel always remains in the expected position.

Description

Technical Field

[0001] This utility model relates to the field of limit switch technology, and in particular to a multi-contact limit switch. Background Technology

[0002] A position switch, also known as a limit switch, is a type of travel switch and belongs to the category of low-current control electrical appliances widely used in industrial control. A travel switch uses the impact of moving mechanical parts to activate contacts, thereby connecting or disconnecting the control circuit to achieve a specific control objective.

[0003] In current technology, limit switches typically consist of a switch body (containing a core), a drive terminal, and a rocker arm. The rocker arm is responsible for adjusting the contact position to ensure it matches the device under test; the drive terminal drives the connecting pieces inside the core to move, thereby changing the position of the connecting pieces to switch between normally open and normally closed contacts.

[0004] In current technical devices, the end of the drive end furthest from the switch body typically has a through slot running vertically through it. A sealing plate is installed within the slot, and a swing arm is installed between the sealing plate and the inner wall of the drive end. Therefore, in current technical devices, both the sealing plate and the swing arm have through holes. Bolts are inserted into the through holes and connected to the drive end via threads, thereby fixing the position of the drive end.

[0005] Therefore, in practical applications, if the height of the swing arm needs to be adjusted, the bolts must be removed. This process is not only time-consuming, but also usually requires the use of specific tools.

[0006] In view of the above problems, this study proposes a new type of multi-contact limit switch, which is designed to enable convenient adjustment of the swing arm height without the need for professional tools. Utility Model Content

[0007] To address the shortcomings of existing technologies, this invention proposes a multi-contact limit switch. This switch features a unique design, requires no external tools, and is simple and quick to operate, successfully solving the problems of time-consuming disassembly and the need for specialized tools in existing technologies.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] A multi-contact limit switch includes a switch body, a drive end rotatably connected to one side of the switch, the drive end having a hollow internal structure, and a through slot being provided at each of the upper and lower ends of the drive end, with a swing arm inserted into both through slots. A contact wheel is rotatably connected to the upper end of the swing arm, and an elastic plate is fixedly connected inside the drive end. A cam is provided on one side of the elastic plate, and the cam is rotatably connected to the drive end. When the larger diameter portion of the cam abuts against the elastic plate, there is an interference fit between the elastic plate and the swing arm.

[0010] Preferably, a ball is fixedly connected to one end of the elastic plate near the cam, and a limiting groove is formed on the larger diameter portion of the cam for the ball. When the ball is embedded in the limiting groove, there is an interference fit between the elastic plate and the rocker arm.

[0011] Preferably, a damping pad is fixedly connected to one end of the elastic sheet near the swing arm, and the deformation amplitude of the damping pad is not less than the depth of the limiting groove.

[0012] Preferably, a limiting pad is fixedly connected to the side of the swing arm near the damping pad, and both the limiting pad and the damping pad are provided with transverse anti-slip grooves.

[0013] Preferably, the elastic plate has multiple synchronous shafts at the end away from the swing arm, the multiple synchronous shafts are arranged at equal intervals from top to bottom, and the synchronous shafts are rotatably connected to the inner wall of the drive end. Each synchronous shaft has multiple cams keyed to its outer side, the multiple cams are arranged in a rectangular array, and the elastic plate has multiple spheres arranged in relation to the rectangular array of multiple cams.

[0014] Preferably, each of the synchronous shafts is keyed to a driven gear on its outer side, and the multiple driven gears are meshed and connected to each other for transmission.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] This invention utilizes a cam to apply a clamping action to the elastic plate, ensuring that the elastic plate exerts significant clamping force and frictional resistance on the swing arm. This design guarantees high stability of the swing arm during actual operation, keeping it always in the predetermined position. Compared with existing technologies, this device can complete the disassembly of the sealing plate without the need for external equipment in practical applications. The operator can easily lock and unlock the swing arm position by simply rotating it with one hand. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0018] Figure 2 This is a schematic diagram showing the relationship between the drive end and the swing arm of this utility model.

[0019] Figure 3 This is a schematic diagram of the internal structure of the drive end of this utility model.

[0020] Figure 4 This is a schematic diagram showing the fit between the cam and the ball in this utility model.

[0021] Figure 5 This is a schematic diagram of the meshing relationship of the driven gear in this utility model.

[0022] In the diagram: 1. Switch body; 2. Drive end; 3. Swing arm; 4. Contact wheel; 5. Limiting pad; 6. Lateral anti-slip groove; 7. Elastic sheet; 8. Damping pad; 9. Limiting groove; 10. Cam; 11. Synchronous shaft; 12. Ball; 13. Driven gear. Detailed Implementation

[0023] 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.

[0024] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0025] Please see Figure 1 A multi-contact limit switch is described, with a structure consistent with existing technology. This switching device includes a switch body 1, one side of which is rotatably connected to a drive end 2. In practical applications, rotation of the drive end 2 can cause the position of the internal wiring contacts of the switch body 1 to change, thereby switching between normally open and normally closed contacts.

[0026] It is worth noting that the drive end 2 is usually equipped with a corresponding swing arm 3. The position of the swing arm 3 is matched with that of the device under test, so as to ensure that the motion state of the device under test can be fed back to the drive end 2 through the swing arm 3, thereby realizing the rotation of the drive end 2.

[0027] Furthermore, in existing devices, the upper end of the swing arm 3 is typically rotatably connected to the contact wheel 4 via a bearing, ensuring that the position of the contact wheel 4 is precisely aligned with the device to be tested. This design utilizes the rotatable connection of the contact wheel 4 to avoid hard dynamic friction between the testing device and the device, thereby reducing the damage rate of the device.

[0028] Please see Figure 1 , Figure 2 , Figure 3 Unlike existing devices, the drive end 2 of this device has a hollow cavity structure. This design effectively reduces the weight of the device and greatly improves the flexibility of the internal component layout.

[0029] Meanwhile, a through slot is provided at the upper and lower ends of the drive end 2, so that the swing arm 3 can be inserted into the through slot. The constraint effect of the through slot on the swing arm 3 allows the swing arm 3 to move vertically, thereby realizing the control of the height of the contact wheel 4 and ensuring that the device can be fully matched with the position of the device to be tested.

[0030] Therefore, as Figure 3 , Figure 4 As shown, in order to control the height of the swing arm 3 and ensure that the contact wheel 4 is always in the expected position, an elastic plate 7 is provided inside the drive end 2 of this device, and the elastic plate 7 abuts against the swing arm 3. The design of the elastic plate 7 gives the swing arm 3 a certain elastic buffer, so that it can effectively reduce the impact when subjected to external force.

[0031] In addition, a cam 10 is provided on the side of the elastic plate 7 away from the swing arm 3. The cam 10 is rotated and connected to the drive end 2, so that the device can press the elastic plate 7 by rotating the cam 10, thereby achieving an interference fit between the elastic plate 7 and the swing arm 3, and thus fully limiting the height change of the swing arm 3 by using friction and clamping force.

[0032] It is worth noting that the cam 10 is a structure in which the side end and the central axis change. Therefore, by rotating the cam 10, the part with the smaller radius will contact the elastic plate 7, thereby releasing the interference between the elastic plate 7 and the rocker arm 3, allowing the rocker arm 3 to move freely up and down.

[0033] Furthermore, in order to increase the contact area between the cam 10 and the elastic plate 7, and to ensure that the limiting effect is not affected by the small contact area when the device constrains the position of the elastic plate 7 by the cam 10, a ball 12 is fixedly installed at the end of the elastic plate 7 near the cam 10.

[0034] Meanwhile, this device features a limiting groove 9 for the ball 12 in the larger diameter portion of the cam 10. Therefore, after the ball 12 is inserted into the limiting groove 9, the interference fit between the elastic plate 7 and the rocker arm 3 is restored. This design effectively increases the contact area between the elastic plate 7 and the cam 10 through the tight fit between the limiting groove 9 and the ball 12. Furthermore, utilizing the structural characteristics of the ball 12, when the ball 12 is inserted into the limiting groove 9, the limiting groove 9 can create a wrapping effect on the ball 12, thus requiring the cam 10 to withstand a larger rotational force to dislodge the ball 12 from the limiting groove 9.

[0035] Furthermore, such as Figure 4 , Figure 5As shown, in order to increase the contact area between the elastic plate 7 and the swing arm 3 and ensure that the swing arm 3 can withstand sufficient clamping force and friction, this device has multiple synchronous shafts 11 at the end of the elastic plate 7 away from the swing arm 3. These synchronous shafts 11 are evenly distributed from top to bottom and are rotatably connected to the inner wall of the drive end 2. Therefore, multiple cams 10 are keyed to the outer side of each synchronous shaft 11, and these cams 10 are arranged in a rectangular array.

[0036] Correspondingly, the elastic plate 7 is provided with multiple spheres 12 in a rectangular array for multiple cams 10. The contact design between the spheres 12 and the cams 10 can significantly improve the friction between the elastic plate 7 and the swing arm 3, thereby enhancing the stability and reliability of the device.

[0037] Furthermore, to ensure ease of operation, the device is equipped with a driven gear 13 connected to the outside of the synchronous shaft 11. The meshing transmission design of multiple driven gears 13 ensures that the operator only needs to rotate a single synchronous shaft 11 to easily achieve effective contact between the large-area elastic plate 7 and the swing arm 3, thus improving ease of operation.

[0038] It is worth noting that in practical applications, since the device fixes the position of the swing arm 3 by the interference fit between the elastic plate 7 and the swing arm 3, in order to prevent the elastic plate 7 and the swing arm 3 from being damaged by hard compression, the device fixes a damping pad 8 at the end of the elastic plate 7 near the swing arm 3. By utilizing the deformability of rubber, the deformation amplitude of the damping pad 8 is controlled to be no less than the depth of the limiting groove 9, which effectively avoids hard friction between the two.

[0039] Furthermore, in order to ensure that the swing arm 3 can be fully constrained by the elastic plate 7 and to avoid insufficient constraint due to the small friction caused by the smooth surface between the elastic plate 7 and the swing arm 3, this device fixes a limiting pad 5 on the side of the swing arm 3 near the damping pad 8. The limiting pad 5 can also be made of rubber, so as to give full play to the characteristic of rubber having a large static friction coefficient.

[0040] Meanwhile, the presence of the limiting pad 5 can further prevent hard compression between the elastic plate 7 and the swing arm 3, ensuring that the elastic plate 7 and the swing arm 3 will not be damaged.

[0041] Furthermore, this device features transverse anti-slip grooves 6 extending through both the limiting pad 5 and the damping pad 8. Therefore, the transverse anti-slip grooves 6 of the limiting pad 5 and the damping pad 8 can interlock, effectively enhancing the stability of the swing arm 3's height. This design not only improves the device's durability but also effectively prevents unexpected changes in the position of the swing arm 3 during long-term use, ensuring the accuracy and reliability of the equipment.

[0042] In practical use, this utility model:

[0043] This invention achieves dynamic adjustment of the switch terminal block position by synchronizing the movement of the swing arm 3 with the movement of the device under test. The innovation of this device lies in the cavity structure and through-slot design inside the drive end 2, as well as the application of the elastic plate 7 and cam 10. These designs not only significantly reduce weight but also improve the flexibility of the internal component layout, ensuring precise control of the swing arm 3's height and accurate docking with the device under test. Furthermore, the device integrates elements such as the synchronous shaft 11, a rectangular array of cams 10, damping pads 8, and limiting pads 5 to enhance the device's stability and reliability.

[0044] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A multi-contact limit switch, comprising a switch body (1), and a drive end (2) rotatably connected to one side of the switch, characterized in that: The drive end (2) has a hollow structure inside. A through slot is opened at the upper and lower ends of the drive end (2). A swing arm (3) is inserted into the two through slots. A contact wheel (4) is rotatably connected to the upper end of the swing arm (3). An elastic plate (7) is fixedly connected inside the drive end (2). A cam (10) is provided on one side of the elastic plate (7). The cam (10) is rotatably connected to the drive end (2). When the larger part of the diameter of the cam (10) abuts against the elastic plate (7), the elastic plate (7) and the swing arm (3) are interference-fitted.

2. A multi-contact limit switch according to claim 1, characterized in that: The elastic sheet (7) is fixedly connected to a ball (12) near the end of the cam (10). The larger diameter portion of the cam (10) has a limiting groove (9) for the ball (12). When the ball (12) is embedded in the limiting groove (9), the elastic sheet (7) and the rocker arm (3) are interference-fitted.

3. A multi-contact limit switch according to claim 2, characterized in that: The elastic sheet (7) is fixedly connected to a damping pad (8) at one end near the swing arm (3), and the deformation amplitude of the damping pad (8) is not less than the depth of the limiting groove (9).

4. A multi-contact limit switch according to claim 3, characterized in that: The swing arm (3) is fixedly connected to a limiting pad (5) on the side near the damping pad (8). Both the limiting pad (5) and the damping pad (8) are provided with transverse anti-slip grooves (6).

5. A multi-contact limit switch according to claim 1, characterized in that: The elastic sheet (7) is provided with multiple synchronous shafts (11) at the end away from the swing arm (3). The multiple synchronous shafts (11) are arranged at equal intervals from top to bottom, and the synchronous shafts (11) are rotatably connected to the inner wall of the drive end (2). Each of the synchronous shafts (11) is keyed to the outside of multiple cams (10), which are arranged in a rectangular array. Furthermore, the elastic sheet (7) is provided with multiple spheres (12) for the rectangular array of multiple cams (10).

6. A multi-contact limit switch according to claim 5, characterized in that: Each of the synchronous shafts (11) is keyed to the outside of a driven gear (13), and the multiple driven gears (13) mesh with each other for transmission.

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