Safety braking device clamped on traction wheel of traction machine

Abstract

The invention discloses a safety braking device clamped on a traction wheel of a traction machine, belonging to the technical field of an elevator safety device. The traction machine comprises the traction wheel. The safety braking device is characterized by comprising a connecting seat assembly, a support seat, a first pincers body, a second pincers body, a limiter, a tension spring, a safety switch, a first reset spring and a second reset spring, wherein the connecting seat assembly is arranged on the traction machine, the support seat is arranged on the connecting seat assembly in a sliding way and is limited by a first reset member and a second reset member, the first pincers body and the second pincers body are respectively arranged at the two ends of the support seat in a length direction and are used for clamping the traction wheel in two-side manner from a width direction of the traction wheel, the tension spring is connected between a sliding block and the support seat, and the limiter and the safety switch are respectively arranged on the support seat or a guide member. The safety braking device has the advantages that the outer surface of a steel wire rope or the traction wheel is prevented from being damaged, and the safety braking device has large effective braking area and a good braking effect, has small volume, and is simple in structure, safety in running, lowin manufacturing cost, high in safety performance and wide in application range.

Description

technical field [0001] The invention belongs to the technical field of elevator safety devices, and in particular relates to a safety braking device clamped on a traction sheave of a traction machine for upward overspeed protection of a car. Background technique [0002] The "Safety Code for Elevator Manufacturing and Installation" stipulates that the car's upward overspeed protection device must be installed when the elevator is arranged. This device is used to quickly stop the traction sheave or wire rope or counterweight to stop the elevator car in an emergency. Or directly stop the car. The upward overspeed protection device of elevator bridge car on the market has the rope gripper of clamping wire rope and the safety gear of clamping guide rail. The structure of the rope clamp is complex and heavy, and the steel wire rope is easily damaged during the braking process, and a certain installation space is required. The safety gear is installed on the elevator car or the ...

AI Technical Summary

Problems solved by technology

But above-mentioned structure still has following defect in actual use: first, the brake shoe of this device is to brake on the outer surface of traction sheave, because there is rope groove on the outer surface of traction sheave, the effective area of ​​braking is very little , after many times of braking, the outer surface of the traction sheave is easy to be worn, the outer diameter is reduced, the braking effect will gradually become worse, and even the braking will not be possible; secondly, when installing this device, installation such as a rack is required The seat is connected with the positioning plate, which requires a certain installation space, and the structure is complex, difficult to install and debug, and difficult to process and manufacture, resulting in relatively high cost

[0004]For another example, the authorization announcement number proposed by the applicant unit is CN201567126U, and the name is "a safety brake device acting on the traction wheel of the traction machine "The utility model patent, the friction plate on the brake shoe is attached to the inner surface of the outer circular column of the traction sheave, and the traction sheave is stopped from the inside of the traction sheave. When the width of the traction sheave is small, The width of the friction plate on the brake shoe will also be reduced, and the braking area will be reduced. Even if the length of the friction plate is increased, the strength of the brake shoe and its friction plate will be reduced, which will pose a safety hazard. Therefore, the safety brake device It can only be installed on the traction machine with large traction wheel width, and the scope of application is narrow

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