Technical installation points for construction elevators

I. Introduction

The construction elevator is a highly efficient vertical transportation construction machine which adopts the gear meshing method or the steel wire rope hoisting method to make the cage vertical or inclined to transport personnel and materials in layers. Because the structure is light and stable, the stable performance is easy to assemble and disassemble. It is widely used for construction and maintenance of buildings because of its characteristics of flexible handling, high lifting capacity, and high carrying capacity.

The installation and construction of the construction elevator is a dangerous operation at high altitude. The installation quality directly affects the safety and progress of the construction. The installation manual is too simple to use. The author uses the SCD200/200J construction elevator installation work on the construction site. The main points of safety technology are elaborated.

Second, the installation of safety technology points

1, the installation environment

As a lift for people and goods, lifts must be provided by a professional team that obtains the disassembly and assembly qualification certificates issued by the construction administrative department. Various safety precautions must be taken at the installation site. Construction lifts must be used for moving parts and building construction equipment. The distance between them is ≥0.25m.

2. Installation of main parts

(1) The height of the basic enclosure shall not be less than 1.5m, and shall be equipped with interlocking devices. The mechanical interlock shall be such that when the cage is only in the position specified at the bottom, the foundation fence door can be opened, and the electrical interlock should be protected After the fence door is opened, the cage is stopped and cannot be started. The main power source is not completely cut off. No one can prevent the unsafe area on the top of the fence or on the fence, and in the guide column and the wall bracket in the lift channel. Internal activities.

(2) The standard section of the pillar joint face should be straight, the misalignment of the formation of the difference ≤ 0.8mm standard section of the rack connection should be solid, butt flat and accurate, the tooth height difference ≤ 0.3mm, tooth period error ≤ 0.6mm guide rail axis line height to the base horizontal reference plane installation verticality tolerance ≤ installation height 1/1000.

(3) When the installation and maintenance work is required on the top of the cage, the guard railings with a height of not less than 1.05m must be installed around the top of the cage when working with the installation boom installed on the top of the cage. Large lifting capacity is 200kg, overload is not allowed, and the load of the lifting cage is also not allowed to exceed the rated installation loading capacity. When there is hanging material on the mounting boom, the lifting cage cannot be started until all the connection bolts are fully tightened and the lifting spreader is After dismantling from the just-installed standard section, it is necessary to move the operation box to the top of the cage when driving the cage to drive the cage. It is not allowed to operate in the cage. When the cage is running, the human body and the transported objects are not Quasily beyond the cage rails, while the cage should have a good vision and sufficient clearance, the net height should be ≥ 2m, the top of the shed to bear the role of 500W load at any point.

(4) Measures shall be taken on the guide rails to prevent counterweights from moving. Applying two or more tie rods will fix the counterweight. The counterweight guide rails shall be straight. The guide rails shall have a deviation of ≤ 3 mm. The counterweight guide rails shall be firm and can withstand corresponding conditions. With additional stress, the free travel above the counterweight must not be less than 0.5 when the cage is parked on a fully compressed buffer.

(5) Stopping rails shall be provided with parking barriers. The parking barriers shall not protrude to the lifting channel of the cage. The switches of the parking barriers may be manually operated, but they shall not be directly controlled by the movement of the cage.

(6)Electrical equipment shall prevent outside interference and impact of rain and snow concrete mortar dust and other substances. Drain holes shall be provided in places where drainage is required. Cables shall be free to be dragged and unhindered in the operation of the cage, and the motor of the elevator structure motor and electrical equipment shall be free. The shell should be grounded and the grounding resistance should not exceed 4

(7) The safety device shall ensure that the elevator cage is braked in a timely and abnormally fast manner. The safety hook shall be prevented from being disengaged from the guide rail frame or the output gear of the safety gear from the rack, and the safety device shall be lifted. The safety switch on the safety device shall disconnect the motor circuit when the safety of the safety device is engaged and disassembled. The brake safety device can only be used during the effective calibration period, and the effective calibration period of the safety device. Not more than two years, the speed control part of the safety device should have an effective seal. Safety switch Limit switch Limit switch Relaxation (break) Rope switch should be sensitive and reliable

(8) The installation position and safety protection of the transmission system should take into account personal safety, its parts and components should have safety protection facilities, transmission parts should prevent rain and snow, mortar, concrete dust and other substances from intruding, transmission system does not allow oil leakage, transmission system The length of the contact between the output gear of the safety gear and the rack gear shall not be less than 40% along the tooth height, not less than 50% along the tooth length, and 0.2 to 0.5 mm as the backlash of the tooth surface.

(9) When carrying out the load test and falling safety device fall test, no man is allowed in the cage and in the fence. Ground control shall be used. Before the drop test, the motor brake is in good condition and the cage must be raised to a safe height. Ensure that the cage does not hit the bumper during the test. After each test, the anti-falling safety device must be properly and timely reset.

Third, the conclusion

Through the description of the safety technical requirements during the installation of the rack and pinion meshing construction elevators, the construction safety is ensured, and the installation quality meets the technical requirements of the construction elevator supervision and inspection regulations.

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