Brake-released wrench used for calibrating drum brake spring

Abstract

The invention provides a brake-released wrench used for calibrating a drum brake spring. The brake release wrench comprises a pitch adjusting component, a pressure sensor, a pair of plier heads, a pair of wrench handles and a distance component, wherein the pair of plier heads are movably hinged to each other through a plier head hinge pin, the tops of the pair of plier heads are connected with pressing parts, one side perpendicular to the top surfaces of the pair of pressing parts is internally provided with an annular cavity, the inner side of the annular cavity is provided with an opening, and the surface of the cavity is provided with an internal thread; the pitch adjusting component consists of an in-sleeve screw rod provided with an internal thread hole and a regulating head with an adjustable raised height, and the in-sleeve screw rod and the pressure sensor are arranged in the annular cavity; the distance component consists of a ruler provided with a strip-shaped groove, and fasteners; the tail parts of the pair of wrench handles are provided with through holes, the ruler is arranged at the tail parts of the pair of wrench handles through the fasteners, and the space between the tail parts of the wrench handles is fixed by adjusting the tightness of the fasteners.

Description

technical field [0001] The present invention relates to an elevator checking tool, more particularly, relates to a brake release wrench used for checking and adjusting drum brake springs. Background technique [0002] The brake is a very important safety component of the elevator. Once it fails, it may cause the car to squat, jump to the top, and run with the door open, resulting in serious consequences such as shearing injuries to personnel. Therefore, in addition to the electric brake, the brake system of the elevator should also have an electromechanical friction brake, which has the functions of parking brake and service brake. [0003] The main types of elevator brakes are drum and disc. Drum brakes are widely used in asynchronous motor traction machines and a considerable part of synchronous motor traction machines due to their simple structure and low cost, including most freight elevators. And a considerable number of passenger elevators use this type of brake. Amo...

AI Technical Summary

Problems solved by technology

[0014] However, in the process of use, this manual brake release wrench has the following disadvantages: it cannot be used to measure the spring pressing force of the brake, and the distance between the brake arm and the coil end cover is also different due to the difference in the elevator brand and model specifications. Different, because the adjustable travel of the adjusting screw is very limited, in order to adapt to the brakes with different spacing, it is necessary to equip the adjusting screw of the corresponding size, which requires carrying a lot of adjusting screws, which brings inconvenience to the inspection and testing work

This method has the following defects: 1. It is difficult to directly obtain the value of the spring pressure, and the spring pressure depends on the data provided by the brake manufacturer, especially the difference of the spring manufacturer or production batch, which makes it difficult to control the actual pressure of the brake spring; 2. The brake After the spring pressure changes due to aging or replacement during use, this adjustment method will produce large errors; 3. Due to the lack of materials and accessories for some old elevators, the spring pressure is usually adjusted based on experience; 4 .Unable to provide corresponding data when evaluating elevator brakes

[0017] In some other cases, due to the limitation of the structure of the main engine of the elevator, it is difficult to directly measure the brake spring force measurement point at the spring installation position, and special measurement tools are required

[0018] It can be seen that due to the lack of feasible on-site inspection devices, the compression force of the compression spring of this type of widely used elevator drum brake has not been detected, thereby leaving potential safety hazards and shortcomings for elevator operation.

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