Elevator traction system with large wrap angles

Abstract

The invention discloses an elevator traction system with large wrap angles.The elevator traction system comprises a traction wheel, a guide wheel and a steel wire rope.The traction wheel is in drive connection with a traction machine, and the traction machine is installed at the upper end of a bearing girder of the traction machine.The guide wheel is installed on the bearing girder of the traction machine, and the guide wheel and the traction wheel are located in the same plane.The steel wire rope strides over the upper portion of the traction wheel and the upper portion of the guide wheel at the same time, one end of the steel wire rope is connected with a counter weight, and the other end of the steel wire rope is connected with a car.A first synchronizing wheel is arranged on one side of the traction wheel, a second synchronizing wheel is arranged on the same side of the guide wheel, and the first synchronizing wheel and the second synchronizing wheel are synchronously connected.The traction wheel and the guide wheel are synchronously connected, so that the guide wheel also has power, the sum of the first wrap angle and the second wrap angle is 180 degrees, and therefore the overall wrap angle of a power system is increased, and the technical problem that a traction rope easily slips on the traction wheel and the guide wheel is solved.

Description

technical field [0001] The present invention relates to a hoisting system of an elevator, more specifically, the present invention relates to an elevator traction system with a large wrap angle. Background technique [0002] In the prior art, traction elevators mostly have a single guide wheel structure, and the single guide wheel single winding structure will cause the rope distance to be greatly increased when the counterweight of a heavy-duty deep car is placed behind or when the counterweight of a heavy-duty wide car is placed on the side. Increase, so that the wrap angle of the traction sheave is significantly reduced. The wrapping angle (first wrapping angle) of the wire rope passing on the traction wheel must be no less than 150°, otherwise it will slip. In general traction systems, the guide wheel has no power, that is, the second wrapping angle is useless. The effective wrap angle of the wire rope in the traction system is less than 150°, especially when the design...

AI Technical Summary

Problems solved by technology

[0004] 1. Increase the positive pressure between the wire rope and the traction sheave, including increasing the empty weight of the car, reducing the groove angle of the traction sheave, and increasing the undercut angle. In these methods, the safety of the traction rope will be increased due to the increase in the specific pressure. A significant reduction in the coefficient will lead to a substantial increase in cost, and the increase in traction is not obvious;

[0005] 2. Increase the compensation rate and increase the compensation chain or rope system, which will significantly increase the product cost, that is, in order to obtain a high compensation rate, the traction force still cannot meet the requirements under many high-speed and heavy-load requirements, and due to the increase in system weight, at the same time It also reduces the safety factor of the traction rope;

[0006] 3. To increase the wrap angle of the traction sheave, the main engine can be too high, and a higher main frame and steel wire rope rewinding structure can be used, but if it is too high, the increase in the wrap angle of the main engine is very limited, and it is generally not used, and the single guide wheel is rewound Structure Due to the double reverse bending of the traction rope, the service life of the traction rope will be greatly reduced. In addition, in the rewinding structure, the number of grooves on the traction wheel and the guide wheel will be doubled, resulting in a huge structure, which will cause damage to the product. The cost has increased significantly

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