Elevator emergency rescue device - Solutions - Huaqiang Electronic Network

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The elevator stops running due to sudden power failure or malfunction. If the car stops between the two layers with a large interval or the bottom of the floor, the passenger will be trapped in the car. In order to rescue passengers, the elevators are equipped with emergency operating devices, which can make the car move slowly, so as to rescue the trapped passengers.

There are two kinds of emergency operation devices. One is the manual manual emergency operation device, that is, the disk driver, when the operation speed required for the traction type reducer or the moving car with the rated load is not more than 400N. Wheel and brake wrench; the other is an electric operating device for emergency electric operation when the elevator without a reducer or the operating force required to move the car with the rated load is greater than 400N.

1 manual emergency operating device

The wheel hand wheel is a wheel tool for rotating the traction motor shaft, for which GB/T7024-1 997 <elevator. escalator. In the terminology of the moving walkway, the definition of the hand wheel is: "a special hand wheel that turns the traction wheel by manpower." The "wheel" should be round, and a non-circular one cannot be called a "wheel." In China, the handwheels that are equipped with elevators have a "one" shape. "Herringbone. "Ten" shape and circle and so on (as shown on the right). GB7588-2003 (Safety Code for Elevator Manufacturing and Installation) puts new requirements on the handwheel of the disc. The difference between GB7588-2003, Article 15.1 and GB7588-1995 is that it can be used to borrow a smooth disk handwheel to move the car to a landing. The wheel can move the car to a landing." It is clearly stated in GB7588-2003 that the handwheel should be spokeless. It can be seen that the "one" shape and the "ten" shape. "人" shaped wheel handle wheel It does not meet the requirements of the standard. In practical applications, the "one-shaped", "ten"-shaped, "human"-shaped hand wheel is not convenient to use, and it is easy to hurt the operator, which itself has insecure factors. The round spokeless wheel hand wheel is easy to use and safe to operate. Article 12.5.1.1 of GB7588-2003 adds more content to the detachable disc hand wheel than GB7588-1 995: · An electrical safety device complying with the provisions of 14.1.2 shall be equipped with an electromagnetic drive host at the latest at the disc driver's wheel. "It is acted upon." This electrical safety device is called "Checking the position of the detachable disc hand wheel" in the Appendix A of the GB7588-2003 standard "Electrical Safety Equipment List". In China, there is no such device in the elevator. According to the above provisions of GB7588-2003, the new elevator product must be equipped with the electrical safety device. The function of this device is to prevent the main engine from starting to damage the car during the car driving process. people. In the past, there was an accident in which the driver was forgotten to turn off the power switch and the elevator suddenly started to cause the driver to be injured. Therefore, it is very necessary to install the electrical safety device in the elevator.

A solution for installing an electrical safety switch in conjunction with a shaft safety cover (in the case of an elevator equipped with a traction motor outreach shaft safety protection device, ie a shaft safety cover), this switch is "checking the position of the detachable disk hand wheel" Safety device. When the traction system is working normally, the electrical safety switch mounted on the shaft safety cover is in a steady state. When loading the hand wheel, the shaft safety cover must be removed first. At this time, the electrical safety switch changes from the original steady state. In another steady state, the traction system cannot work, so as to achieve the purpose of turning the car while disconnecting the drive host. To set up this device, it should be considered that the electric hand wheel should not be touched by the above-mentioned electric switch.

Another solution is to install an electrical safety switch on the traction motor end cover. In the normal state, the switch is in a closed state to close the circuit. When the wheel hand wheel is installed to verify the position switch, the contacts must always be in a reliable disconnected state.

2 Electrical operating device for emergency electric operation

The electrical operation device of the emergency electric operation is similar to the structure of the machine room maintenance device in the machine room, and is also controlled by continuously pressing the button. However, the main difference is that the inspection operation is performed under normal conditions of the safety loop. The emergency electric operation can be carried out under the condition that the safety circuit is partially broken, such as the speed limiter and the safety clamp switch action.

Nowadays, the elevator adopts a toothless traction machine, and the force of moving the car mostly exceeds 400N. However, the emergency electric running electrical operating device equipped with this kind of elevator can only operate under the condition of shorting the speed limiter and safety clamp switch, but when the car is in the counterweight, the bottom is in the middle or the middle item, the emergency electric running operation Can not run, affecting the efficiency of emergency rescue.

The machine room-less elevators are popular among users because of their small footprint. However, the current emergency operation devices for machine-room elevators generally use manual release brakes, which are moved by the effect of the car on the unbalanced moment. However, when the weight of the two is equal and the difference in unbalance torque is small, it is more difficult to evacuate passengers. Due to the small space at the top of the hoistway, manual manual turning is not possible. It is recommended that the machine room-less elevator should be equipped with an electric operating device for emergency electric operation.

The emergency operating device of the elevator seems to be a simple accessory on the elevator. However, it is an important embodiment of the elevator-oriented equipment, which should cause the elevator design, manufacture and installation. The use and inspection of the inspection unit's high priority to ensure that the elevator power failure or failure to rescue passengers play an important role.