Heat flux density improved method for safety tongs of explosion-proof elevator

A heat flux density, safety gear technology, applied in electrical digital data processing, special data processing applications, instruments, etc., can solve problems such as unreported, and achieve accurate and credible measurement results.

Active Publication Date: 2012-04-25
SHANGHAI INST OF SPECIAL EQUIP INSPECTION & TECHN RES +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, as far as we know, the thermal-mechanical coupling finite element an

Method used

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  • Heat flux density improved method for safety tongs of explosion-proof elevator
  • Heat flux density improved method for safety tongs of explosion-proof elevator
  • Heat flux density improved method for safety tongs of explosion-proof elevator

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Embodiment Construction

[0032] Further illustrating the present invention, techniques for the manufacture of such devices will be readily apparent to those skilled in the art.

[0033] The finite element model is established by ABAQUS as follows,

[0034] Heat flux model:

[0035] Estimation of instantaneous heat flux:

[0036] During the braking process of the safety gear, within the time t when the automatic action starts, the gravitational potential energy and kinetic energy of the system are converted into frictional energy for the temperature rise of the entire system.

[0037] Among them, the gravitational potential energy is changed to:

[0038] W 1 = mgh (1)

[0039] in h = v 0 t - 1 2 at 2 .

[0040] The change in kinetic energy is:

[0041] W 2 = 1 2 ...

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Abstract

The invention relates to the design technology of safety tongs of an explosion-proof elevator, and in particular relates to a heat flux density improved method for safety tongs of the explosion-proof elevator. In the method, time average effect is taken out, and the spatial average effect still exists at the same time so as to obtain a conservative temperature rise evaluation; analysis is performed from the point of view of contact mechanics, a complete finite element numerical model is established for stopping the safety tongs, the lift car mass is equivalent to the safety tongs block body material with extra-high density, the working pressure and initial stopping speed same as the actual working condition are applied, finite element simulation is carried out aiming at the stopping process of the safety tongs, the influences from the friction coefficient, stopping working pressure, initial stopping speed, safety tongs block material and plastic deformation of safety tongs blocks in the stopping process on the maximum stopping temperature rise can be researched by simulation analysis, the above research result is verified through a drop stopping test and is compared with a simulation result so as to ensure the measurement result to be more accurate and credible.

Description

[technical field] [0001] The invention relates to the design technology of explosion-proof elevator safety gear, in particular to an improved heat flux density method for explosion-proof elevator safety gear. [Background technique] [0002] The tribological properties of the elevator safety gear are very important: On the one hand, under the worst working conditions, such as when the suspension device breaks, the friction between the safety gear clamp block and the guide rail should be strong enough to lock the car on the guide rail superior [1] ; On the other hand, for some special types of ladders, such as explosion-proof elevators widely used in the petrochemical industry, the friction temperature rise between the clamp block and the rail should also be limited to a safe range [2] . [0003] There are two main types of safety gear: instantaneous and progressive. The feature of the instantaneous safety gear is that the braking distance is short, and the car is subjected...

Claims

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Application Information

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IPC IPC(8): G06F19/00
Inventor 薛季爱江浩姚俊史熙朱昌明张鹏徐国强丁惠嘉
Owner SHANGHAI INST OF SPECIAL EQUIP INSPECTION & TECHN RES
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