Patent ID: 8602178

Claim:
A constant strain spring compensation device, comprising a grooved pulley, a compensation cable, a left end plate, a spindle, an oil seal, a bearing, a right end plate, a contact flat spiral spring, a housing, a fastening angle steel, a mounting base, a pin, and a wire-breaking arresting device; said grooved pulley being fixed on the spindle, said compensation cable being wound and one of its ends being fixed on the grooved pulley, and the other end being connected to exterior overhead contact lines, said spindle being supported on the left end plate and the right end plate by using the oil seal and bearing; said left end plate, right end plate, housing, fastening angle steel, and mounting base forming a closed box base, said pin being connected to the side of the mounting base remote from said box base; said contact flat spiral spring being assembled within said box base, with an inner end hook being connected to the spindle and an outer end hook being connected to the fastening angle steel of the box base; said wire-breaking arresting device being installed on the left end plate, the right end plate, or a combination thereof, the wire-breaking arresting device being cooperatively assembled with the grooved pulley and the left end plate, right end plate, or a combination thereof in order to stop the grooved pulley to a stationary status by means of friction in the case of breakage of the overhead contact lines or the compensation cable, so that the contact flat spiral spring does not produce a relatively large rebound force, ensuring the safe operation of the constant strain spring compensation device.