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1、英文翻译第 1 页 共 10 页英文原文1. General description of the SIEMAG disc brake unitThis brake unit is the electro-hydraulic control system of a gearless disc brake for winders. The brake unit operates on the exhaust principle, i.e. the braking force is generated by sets of disc springs and released by hydrauli
2、c pressure.The braking force generators with the brake shoes directly act axially on the brake disc. The braking force is generated by sets of disc springs and transmitted onto the brake shoes. The number of brake elements determines the respective braking force required.As soon as the brakes are be
3、ing released, the brake shoes are lifted form the brake disc with the aid of pressure oil. During the braking, the oil flows back into the tank and the brake shoes are being pressed against the brake disc.The braking force generators type BSFG 408 are s series product supplied by the Swedish firm AS
4、EA-Hagglunds. They have a maximum press-down force of 2X7906 kN.For reasons of better system availability, the hydraulic pressure is generated by two regulating pumps that are each driven by an electric motor. Both pumps are started when the system is being switched on. Any failure of a pump will be
5、 signaled.The oil filtration is undertaken by a pressure filter6.2provided in front of the braking force generators. Furthermore, two gear pumps that are directly coupled with the regulating pumps, maintain a permanent oil cooling and filtering circuit during system operation (filter6.1and cooler14)
6、. Both filters have an electrical contamination control. The mesh size of the filters is specified by the supplier to be 10m (see TAS No.3.9.6.4). The equipment includes a controlled electrical tank heating. The fluid level in the tank is monitored as well.The service braking is done with the aid of
7、 two electrically controlled proportional pressure relief valves43.1and43.2that are hydraulically connected in series.The safety braking is done with the aid of position-controlled 4/2-way electro valves53.1 、53.2 、 39.1 、 39.2 、 58.1 、 58.2 、 66.1 ，and66.2which are electrically actuated in closed-c
8、ircuit connection. In the event of a safety braking, the directional control valves39.1and39.2are switched off, separating thus the pump pressure from the remaining brake releasing system(hydraulic shunt).During the safety braking, the directional control valves6.1and66.2are acting as pilot valves f
9、or the 2/2-way valves65.1and 65.2which again release the pressure relief valves64.1and64.2.The electro valves53.1and53.2operate as outlet valves according to TAS No.3.9.5.9.The mechanically controlled pressure relief valves60.1and60.2are arranged in the outlet line of these valves. They determine th
10、e residual pressures in the course of safety braking. These residual pressures (pressure stages 1 and 2) are maintained by bladder-type accumulators.The gas pressure of the respective accumulator used is monitored.The march of pressure is adjusted with the aid of mechanical skids which are adapted t
11、o the braking process desired.A hand-operated pump48is provided for assembly purposes, when the controlled main 英文翻译第 2 页 共 10 页stop cocks46.1and46.2in the outlet line of the brake elements are locked.The position-controlled 4/2-way valves63and the pressure relief valves 25.1and25.2(residual pressur
12、e accumulator) are fed by a back-up power supply in open-circuit connection. The valves get open when the solenoids are energized.With the commandRELEASE BRAKE ，the two residual pressure accumulators are filled through the check valves87.1and87.2.The residual pressure accumulator24.1(pressure stage
13、1) is connected through the 4/2-way valve86. The residual pressure accumulator24.2(pressure stage 2) is automatically connected by a change-over of the 4/2-way valve86, when the hoisting load changes accordingly.2. Functional description of the electro-hydraulic control system corresponding to the h
14、ydraulic drawing No.0905216/12.1 Method of operation of the brake unitThe braking force is the sum of pressing forces per brake shoe, reduced by the forces being generated by the oil pressure in the cylinders of the brake element.The force required for the service braking is achieved by controlling
15、the oil pressure. Two pressure regulating valves43.1and43.2, each being fitted with separate control electronics and function control, are connected in series, permitting thus a stepless adjustment of the valves between a minimum and a maximum pressure. In the case of failure of one brake is applied
16、 when the spring forces press the brake shoes against the brake disc without counterpressure. The brake is released when the pressure oil in the cylinders of the brake elements reduces the spring forces to zero and the brake shoes are lifted the brake disc.The brake releasing pressure is generated through the pressure-controlled pumps1.1and1.2which are driven by electric motors3.1and3.2. The pressure reg
