Limit switch for elevator

Abstract

The utility model discloses a kind of limit switches for elevator, it is characterized by, including: a switch box body, limit block is set in one side in the switch box body, the rocker structure being installed in switch box body through bushing is set on the limit block top;Rubber wheel that is contacted by the collision of the movement of stop block is swung or slid by swing arm and main shaft and drives the rocker structure;The swing or sliding amplitude of the rocker structure is limited by the limit block;The rocker structure swing or sliding is further transmitted to the electrical triggering mechanism in switch box body, and circuit conduction is realized by the mode of triggering electrical signal;The electrical triggering mechanism includes plate spring installed on the support structure of the rocker structure;Moving contact piece is contacted or separated on fixed contact of fixed contact piece by plate spring drive and realizes. A kind of limit switch for elevator of the utility model is simplified by optimizing structure design significantly and improves operating stability.

Description

Technical Field

[0001] This utility model relates to the field of elevator parts manufacturing, specifically to a limit switch for elevators. Background Technology

[0002] To address the limitations of traditional switch boxes in terms of manufacturing process, this invention eliminates the need for an additional brake on the original box, directly removing the brake component. Simultaneously, by designing and employing a limiting block, it achieves a more precise fit with the internal transmission mechanism of the switch.

[0003] This improvement avoids the complex procedures involved in brake installation (such as fastener assembly and debugging), and enhances the mechanical transmission efficiency of the triggering mechanism by optimizing the position of the limit block, reducing the risk of malfunctions caused by loose components or misalignment. Compared to traditional structures, this invention effectively ensures the long-term stability and reliability of the limit switch during elevator operation while reducing production difficulty. Utility Model Content

[0004] To overcome the aforementioned shortcomings of the prior art, the purpose of this utility model is to provide a limit switch for elevators. This utility model significantly simplifies the manufacturing process and improves operational stability through optimized structural design.

[0005] To achieve the purpose of this utility model, the technical solution adopted is as follows:

[0006] An elevator limit switch includes:

[0007] A switch box body, wherein a limit block is provided on one side of the switch box body, and a rocker structure is provided above the limit block body and installed in the switch box body through a bushing;

[0008] The rubber wheel that collides with the stop block's movement drives the rocker structure to swing or slide via the swing arm and main shaft;

[0009] The swing or sliding amplitude of the rocker structure is limited by the limiting block;

[0010] The rocker arm structure swings or slides, and the transmission is further sent to the electrical triggering mechanism inside the switch box to realize circuit conduction by triggering an electrical signal.

[0011] The electrical triggering mechanism includes a leaf spring and a return spring mounted on the support structure of the rocker structure;

[0012] A moving contact that is driven by a leaf spring to make or separate from a fixed contact on a fixed contact plate.

[0013] In a preferred embodiment of this utility model, a plurality of silver contacts made of silver material are provided on the contact surface of the moving contact piece.

[0014] In a preferred embodiment of this utility model, one end of the moving contact is disposed in the switch box body by a moving contact fixing screw.

[0015] In a preferred embodiment of this utility model, the end of the leaf spring is disposed in the switch box body by a leaf spring fixing screw.

[0016] In a preferred embodiment of this utility model, one end of the fixed contact is disposed in the switch box body by a fixed contact fixing screw.

[0017] In a preferred embodiment of this utility model, a terminal block is provided at the bottom of the switch box, through which the circuit of the electrical triggering mechanism is connected to the outside via the wire inside the terminal block.

[0018] In a preferred embodiment of this utility model, the upper part of the switch box is provided with an openable and closable transparent cover by cover fixing screws.

[0019] In a preferred embodiment of the present invention, the rubber wheel is disposed at one end of the swing arm via an axle, a hub, and a matching buckle, and the other end of the swing arm is connected to the main shaft.

[0020] The beneficial effects of this utility model are as follows:

[0021] This utility model discloses an elevator limit switch that significantly simplifies the manufacturing process and improves operational stability through optimized structural design. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the present invention. Figure 1 .

[0023] Figure 2 This is a schematic diagram of the structure of the present invention. Figure 2 .

[0024] Figure 3 This is a schematic diagram of the structure of the present invention. Figure 3 .

[0025] Figure 4 This is a schematic diagram of the structure of the present invention. Figure 4 . Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit its scope. Furthermore, in the following descriptions, well-known structures and technologies have been omitted to avoid unnecessary confusion regarding the concept of this utility model.

[0027] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, terms such as "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] like Figure 1-4 The elevator limit switch shown includes a switch box 1, and a limit block 22 is provided on one side inside the switch box 1. Multiple limit blocks 22 can be provided as needed.

[0029] A rocker structure 18 is provided above the limit block 22 and installed in the switch box 1 through a bushing 17.

[0030] The rubber wheel 7, which is in contact with the external stop (not shown in the figure) due to the movement of the external stop, swings or slides through the rocker arm 3 and the main shaft 4, which drives the rocker arm structure 18.

[0031] Specifically, the rubber wheel 7 is set at one end of the swing arm 3 via the wheel axle 5, the wheel hub 6 and the matching buckle 16, and the other end of the swing arm 3 is connected to the main shaft 4.

[0032] If the rocker arm structure 18 swings or slides, the limit block 22 will limit the range of motion. The limit block 22 can prevent the rocker arm structure 18 from being damaged due to excessive displacement (such as excessive impact of the stop block when the elevator is going to the top or bottom).

[0033] The rocker arm structure 18 swings or slides, and the signal is further transmitted to the electrical triggering mechanism inside the switch box 1 to activate the circuit by triggering an electrical signal.

[0034] The electrical triggering mechanism includes a leaf spring 10 and a return spring 9 mounted on the support structure of the rocker structure 18, and a moving contact 14 driven by the leaf spring 10 to make contact or separate from the fixed contact on the fixed contact 15.

[0035] The end of the leaf spring 10 is mounted inside the switch box 1 by leaf spring fixing screws 11 and 13.

[0036] One end of the fixed contact 15 is mounted inside the switch box 1 by a fixed contact fixing screw 19.

[0037] The function of the reset spring 9 is to work with the elastic restoring force of the leaf spring 10 to make the moving contact 14 move in the opposite direction after the triggering is completed, returning it to the initial position.

[0038] The contact surface of the moving contact 14 is provided with several silver contacts 20 made of silver material. The silver contacts 20 are made into close contact with the fixed contacts on the fixed contact 15 by mechanical pressure (such as the preload provided by the leaf spring 10), thereby reducing contact resistance fluctuations.

[0039] One end of the moving contact 14 is mounted inside the switch box 1 by the moving contact fixing screw 12.

[0040] A terminal block 8 is provided at the bottom of the switch box 1, through which the circuit of the electrical triggering mechanism is connected to the outside via the wires inside the terminal block 8.

[0041] The upper part of the switch box 1 is provided with an openable transparent cover 2 by cover fixing screws 21.

[0042] Because of the above structure, the working principle of this utility model is as follows:

[0043] When the elevator car reaches its limit position, the stop (bumper) first contacts the rubber wheel rather than directly impacting the rigid rocker structure.

[0044] The rubber wheel absorbs some of the impact force through elastic deformation, reducing the mechanical stress on the rocker arm structure and switch.

[0045] The stop block pushes the rubber wheel, which in turn causes the rocker arm structure to swing or slide.

[0046] The rocker arm structure further transmits the thrust from the rubber wheel to the electrical triggering mechanism, which then activates the circuit by triggering an electrical signal.

[0047] The displacement of the rocker structure drives the electrical triggering mechanism, causing the moving contact to contact or separate from the fixed contact, thus completing the circuit switching.

[0048] When the moving contact separates from the fixed contact, the leaf spring is in its natural or pre-compressed state, applying an initial elastic force to the moving contact.

[0049] The moving contact piece maintains a preset contact state with the fixed contact piece under the action of the leaf spring.

[0050] When the spring reaches its limit position, the deformation force of the leaf spring is transmitted to the moving contact, causing it to overcome the elastic force and displace to contact the fixed contact.

[0051] When the elevator leaves the limit position, the elastic restoring force of the return spring and the leaf spring causes the moving contact 14 to move in the opposite direction after completing the trigger conduction, returning to the initial position. The moving contact separates from the fixed contact, and the circuit is broken.

[0052] The above shows and describes the basic principles, main features, and advantages of this utility model.

[0053] Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope. All such changes and modifications fall within the scope of this utility model as defined by the appended claims and their equivalents.

Claims

1. A limit switch for elevators, characterized in that, include: A switch box body, wherein a limit block is provided on one side of the switch box body, and a rocker structure is provided above the limit block body and installed in the switch box body through a bushing; The rubber wheel that collides with the stop block's movement drives the rocker structure to swing or slide via the swing arm and main shaft; The swing or sliding amplitude of the rocker structure is limited by the limiting block; The rocker arm structure swings or slides, and the transmission is further sent to the electrical triggering mechanism inside the switch box to realize circuit conduction by triggering an electrical signal. The electrical triggering mechanism includes a leaf spring mounted on the support structure of the rocker structure; A movable contact piece, driven by a leaf spring, makes contact or separate from a fixed contact on a fixed contact piece; the contact surface of the movable contact piece is provided with a plurality of silver contacts made of silver material; one end of the movable contact piece is fixed in the switch box body by a movable contact piece fixing screw; the end of the leaf spring is fixed in the switch box body by a leaf spring fixing screw; one end of the fixed contact piece is fixed in the switch box body by a fixed contact piece fixing screw; a rubber wheel is fixed to one end of a swing arm by a wheel axle, a wheel hub, and a matching buckle, and the other end of the swing arm is connected to the main shaft.

2. The limit switch for elevators as described in claim 1, characterized in that, A terminal block is provided at the bottom of the switch box, through which the circuit of the electrical triggering mechanism is connected to the outside via the wires inside the terminal block.

3. The limit switch for elevators as described in claim 1, characterized in that, The upper part of the switch box is equipped with an openable transparent cover by cover fixing screws.

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