Safety device of construction lifter has damping type rope protection device, hand braking, door hook block, door safety interlock switch, broken rope switch, upper and lower limit switch, upper and lower limit switch, and at the base of the spring buffer device. Damping type rope protection device when the driving rope hoisting cage relaxation or fracture, non-metallic friction materials of brake with inclined block in the spring under the action of upward lift, brake, friction with the guide frame and implement will stop hanging cage on the guide frame. When the wire rope of the driving cage is tensioned and pulled upward, the pressure of the brake diagonal block to the guide rail is eliminated, and then it is back in place. Between the brake slant and the guide rail seamless steel tube should keep the gap, ensure that the cage can be up and down free movement. The brake inclined block and the slide should be lubricated periodically to prevent rust and ensure the flexibility of the movement.
A hand brake is installed on the cage. When the brake handle is pulled, the brake slant is lifted and frictional force is generated between the seamless steel tube of the guide frame to realize the brake. Hand brake braking is used to ensure safety when the hoisting cage stops on the guide rail, and the installation personnel are connected to the rail frame for height or demolition.
The door hook safety insert is equipped with a safety plug mechanism on the cage. When the cage door is opened, the insert is automatically inserted into the guide rail to ensure that the cage can be stopped on the guide rail when the wire rope is slack or broken. When the cage door is closed and the door hook is locked, the block is returned and the cage is free to move up and down. The device can be used to stabilize the cage on the guide rail to ensure the safety of the loading and unloading personnel. The cage door interlock switch is equipped with the cage door interlock switch in the cage, which can not start the cage when the cage door is open. When breaking the rope, the switch immediately cuts off the control circuit, the brake holds the brake and the hoist stops turning.
The upper and lower limit switches are installed on the guide rail frame and the cage, for automatic reset type. When the cage is rising, a ceiling switch is installed in order to prevent accidental operation of the cage. When the wrong operation occurs, the slanting ruler first collides the travel switch, and the control circuit is cut off so that the hoist stops turning. When the cage is lowered, a lower limit switch is provided to prevent the misoperation of the hoist. When the wrong operation occurs, the cage slope is first to hit the lower limit switch, and the control circuit is cut off so that the winch will stop running automatically. Thus, the wire rope will not be slack, and the steel wire rope of the winder will always be in order.
The limit switch is set in the upper and lower limit switch type construction lift. The function is that the limit switch will cut off the total power supply when the cage is running beyond the limit switch and the longer range. The limit switch is non-automatic reset type, and can only be restarted by manual reset. The limit switch is mounted on the guide rail and the cage.
The upper limit switch is in normal working condition, the distance between upper limit switch and upper limit switch is. If the limit switch control system failure, after the process of distance, hanging cage limit switch on the bevel collision, the elevator always power cut, hoist to stop working, and ensure the safety of the elevator work. The lower limit switch is in normal working condition. Before the cage touches the buffer, the lower limit switch first moves, that is, the installation position of the lower limit switch is between the lower limit switch and the buffer. If the lower limit switch control system failure, after a more routine distance, bevel hoisting cage collision under the limit switch, cut off the main supply the whole elevator, hoist to stop working, and ensure the wire rope is not went into a state of relaxation. A spring buffer is a device mounted on a lift base to mitigate the impact. When the current limit switch fails to operate, it can absorb the impact kinetic energy of the cage. In normal working conditions, the spring buffer is not working.
At present, some manufacturers do not pay much attention to the role of safety devices in construction elevators. When the product is made, it lacks the safety devices such as cage door interlock switch, broken cord switch and upper and lower limit switch. Some construction unit because of a lack of understanding the action of the type of safety device of construction hoist or safety consciousness, does not pay attention to when using various security equipment maintenance and maintenance, make some safety equipment damaged, lost or not working. All in all, both in production factory and construction units to improve safety awareness, correctly understand the role of construction lifter various safety devices, to ensure that products in the factory and the use of safety device ready and in good condition, can guarantee the safety of construction lifter.
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