Engineering machine and high-voltage safety protection system of engineering machine

Abstract

The invention discloses a high-voltage safety protection system of an engineering machine. The high-voltage safety protection system comprises a plurality of high-voltage modules, wherein each high-voltage module is provided with a protective cover; one high-voltage module is a power distribution box, and another high-voltage module is a supercapacitor; the power distribution box is connected with the other high-voltage modules; all high-voltage module are respectively provided with at least one protection switch; when the protective cover is opened, the protection switch is switched off so as to disconnect the supercapacitor and the power distribution box. The high-voltage safety protection system disclosed by the invention has the advantages that when a worker opens the protective cover of the high-voltage module for maintenance or other operations, the protection switch is in a switched-off state, simultaneously the supercapacitor and the power distribution are disconnected, so that the high-voltage energy is blocked, the safety of the worker and equipment is ensured and the safety coefficient is higher; and when the protective cover is opened, and the supercapacitor and the power distribution are disconnected instantaneously, so that the response speed is fast. The invention also discloses the engineering machine comprising the high-voltage safety protection system.

Description

technical field [0001] The invention relates to the technical field of engineering machinery, in particular to an engineering machinery and a high-voltage safety protection system thereof. Background technique [0002] With the continuous development and progress of construction machinery, hybrid machinery has gradually become a model of energy conservation and environmental protection in the new era. Taking a hybrid bulldozer as an example, its power transmission uses an engine to drive a generator. The voltage of the generator is rectified to DC high voltage, and the DC high voltage is inverted to a controllable three-phase AC voltage to drive the motor. The motor is connected to the final drive to output torque to drive the bulldozer. [0003] The high-voltage module of the electric drive bulldozer includes a generator module, a drive motor module, a super capacitor, an auxiliary power supply, and a distribution box, etc. All high-voltage modules have a safety protection...

AI Technical Summary

Problems solved by technology

This method solves the problem of inconvenient maintenance and replacement of fuses. However, this method has poor anti-interference ability, is prone to misoperation, and lacks flexibility. At the same time, the relay has a certain response time and has a certain hysteresis.

[0006] After the relay of the safety system is activated, if the supercapacitor is not disconnected from the main circuit, the supercapacitor will discharge, so that there is still current in the main circuit, which poses a safety hazard

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