Wire rope electric hoist practical knowledge

Motors generally use a cone-type motor, which automatically locks the brake when it is stopped, and its associated steel wire ropes include phosphated steel wire ropes, galvanized steel wire ropes, and smooth steel wire ropes.

Wire rope electric hoist belongs to the special lifting equipment, which has the advantages of compact structure, light weight, small size, strong universal parts, and easy operation. It can be installed separately on the I-beam, but it can also be installed on electric or manual single beam, double beam, cantilever, gantry and other cranes.

Application of wire rope electric hoist

Mainly used for various lifting, relocation, loading and unloading of heavy objects, flipping and welding of oil tanks, such as installation and movement of large and medium-sized concrete, steel structures and mechanical equipment. It is applicable to construction and installation companies, civil engineering works and bridges of factories and mines, and bridges. Construction, power, shipbuilding, automobile manufacturing, construction, roads, bridges, metallurgy, mining, slope tunnels, wells and other infrastructure construction and protection of mechanical equipment.

Wire rope hoist parameter model

The tonnage of the electric wire rope hoist is 0.5T/1T/2T/3T/5T/10T/16T/20T. Its standard wire rope is 6M/9M/12M/18M/24M/30M. It is also divided into CD1 (single speed type) and MD1 (double speed type),

The following is the operating speed of wire rope electric hoist:

0.5T-5T 10T 16T-20T

Single Speed: 8M/MIN Single Speed: 7M/MIN Single Speed: 3.5M/MIN

Two-speed: 8M/MIN, 0.8M/MIN, two-speed: 7M/MIN, 0.7M/MIN Two-speed: 3.5M/MIN, 0.35M/MIN

Structural features

The components of the wire rope electric hoist are: motor, transmission mechanism, reel and wire rope. The motor and reel can be roughly divided into four types depending on their position.

(1) The electric hoist with the axis of the motor perpendicular to the axis of the drum adopts a worm gear. The width is large in size, the structure is heavy, the mechanical efficiency is low, and machining is difficult. There are no manufacturers to produce this type of structure.

(2) The electric hoist with the axis of the motor parallel to the axis of the drum has the advantage of a small height and length. The disadvantages are large width dimensions, grouping, and complex manufacturing and assembly. Large turning radius.

(3) The electric hoist mounted on the inside of the drum has the advantages of small length and compact structure. Its main disadvantages are poor thermal conditions of the motor, poor grouping performance, inconvenience in checking, installing, and maintaining the motor, and complex power supply devices.

(4) The electric hoist mounted on the outside of the drum has the advantages of good grouping, high degree of generalization, easy change of height, easy installation and overhaul. The disadvantages are: large size.

Component parts

The composition of wire rope electric hoist can be roughly divided into:

1. Reducer 2. Reel unit 3. Lift motor 4. Electric carriage 5. Cone brake 6. Adjustment nut 7. Rope guide 8. Coupling 9. Hook device 10. Control button 11. Hollow shaft 12. Box 13. Seal ring 14.09 Gear 15.06 Gear shaft 16.05 Gear shaft 17.04 Gear shaft 18. Ball bearing 19. Needle roller bearing 20. Box cover 21. Vent plug

The role and function of each part are as follows:

Reducer: It is a three-stage fixed-shaft helical gear transmission mechanism. The gears and gear shafts are all made of heat-treated alloy steel. The box and lid are made of high-quality cast iron with tight assembly and good sealing.

Control box: It adopts a device that can cut off the main circuit in case of emergency and has a fire protection stopper for the up and down stroke protection section.

Wire Rope: It is a type of hoisting wire rope that guarantees durability. Cone motor: The hoist motor uses a large torque cone motor to brake the asynchronous motor without the need for external brakes.

Push button switch: hand-operated, lightweight and flexible, sub-rope control and cordless remote control in two ways.

Use caution

1. For the first installation or reassembled wire rope electric hoist, you should perform the no-load operation first, but make sure that the components are installed and do not have electricity.

2. Before the normal use, it shall be carried out with 125% of the rated load, lifting about 100 mm off the ground, 10 minutes of static load test, and check whether it is normal.

3, dynamic load test is the rated load weight, for repeated lifting and left and right movement test, after the test to check the mechanical transmission part, electrical parts and connecting parts are normal and reliable.

4. In use, it is absolutely forbidden to use in the environment that is not allowed, and when the rated load and the number of closing times per hour (120 times) are exceeded.

5, installation and commissioning and maintenance, must strictly check whether the limit device is flexible and reliable, when the hook rises to the upper limit position, the distance from the hook shell to the drum shell must be greater than 50mm (10t, 16t, 20t must be greater than 120mm). When the hook is lowered to the lower limit position, the safety wire rope should be secured on the drum. The effective safety ring must be more than 2 turns.

6. It is not allowed to simultaneously press two flashlight door buttons that make the electric hoist move in the opposite direction.

7. After the work is completed, the main gate of the power supply must be pulled open to cut off the power supply.

8, electric hoist should be manipulated by a person, the operator should fully grasp the safety operation regulations, is strictly prohibited oblique pull.

9. During the use, electric hoists must be regularly checked by special personnel and faults must be promptly taken and carefully recorded.

10. When adjusting the braking drop of the electric hoist, it should be ensured that under the rated load, the braking slip amount S ≤ V/100 (V is the distance of stable lifting of the load within the next minute).

11. Standards for scrapping steel wire ropes: Inspection and scrapping standards for steel wire ropes shall be implemented in accordance with CB/T5972-1986 "Practical Code for Inspection and Disposal of Wire Ropes Used in Hoisting Machinery".

12. The electric hoist must maintain enough lubricating oil and keep the lubricating oil clean. It should not contain impurities and dirt.

13. When using steel wire rope for oiling, use a bristle brush or a wooden piece, it is forbidden to use the hand directly to oil the working steel wire rope.

14. When the electric hoist is not working, it is not allowed to suspend heavy objects in the air to prevent permanent deformation of the parts.

15. In the course of use, if a fault is found, the main power should be cut off immediately.

16, use special attention should be paid to the situation of wearing parts.

17, 10 - 20 tons of hoist in a long period of continuous operation, there may be automatic power-off phenomenon, which belongs to the motor overheating protection function, this time can be down, after a period of time, the motor can continue to work after cooling down.

18, use and management in accordance with JB9009-1999 "wire rope electric hoist Safety Regulations" in Article 4 implementation.

19. Inspection and maintenance shall be carried out in accordance with Article 5 of JB9009-1999 "Safety Regulations for Wire Rope Electric Hoists".