The fixed principle of expansion bolt elevator expansion bolt is the same. The main differences are as follows:

1. The wall thickness of the expansion pipe of the elevator expansion bolt is greater than that of the general expansion bolt of the same standard;

2. Several knurled grooves are added to the expansion pipe of the elevator expansion bolt to increase the tensile strength;

3. The screw head standard of elevator expansion bolt is larger than that of general expansion bolt head standard;

4. Enlarged flat washer (GB / t96) is used for elevator expansion bolt, general flat washer (GB / T95) is used for general expansion bolt. Application scale of elevator expansion bolt: This product is most suitable for the fastener of elevator other heavy objects. It is made of high-quality steel, has strong anti-seismic tension grip force. Generally, the pressure of reinforced concrete is less than 25MPa. The operation of the equipment is the same as that of the expansion bolt. The raw material of the expansion pipe of elevator is good, which can ensure the standard of tension shear resistance expansion pipe the wall thickness. The milling groove on the expansion pipe can be processed in strict accordance with the standard standard. Only by increasing the resistance tension can the screw thread have high precision good cooperation performance with nuts.

Elevator expansion bolt

How much weight can the expansion bolt bear

Suppose that the hook is strong welded can bear a moving object weighing 100 kg. But the minimum bearing capacity is at least 300 kg. Allowable tensile force of steel expansion bolt (suspension condition): M6 = 1667 (n), M8 = 2354 (n), M10 = 4315 (n), M12 = 6865 (n)

Expansion screw is generally said to be metal expansion screw, expansion screw fixation is the use of wedge slope to promote swelling to conflict with the grip force, to achieve the fixed role. The screw is threaded at one end tapered at the other. The steel tube is covered with a sheet of iron (some of which are steel pipes). Half of the iron cylinder (steel pipe) is blocked, then they are put into the holes made on the wall together. Then, the nuts pull the screws outward, the taper is pulled into the iron cylinder. The iron cylinder is expanded, so it is firmly fixed on the wall. It is generally used for fastening the protective fence, awning, air conditioner other materials on cement brick. However, its fixation is very reliable, assuming that the load has a great sensation may loosen, so it is recommended for equipment ceiling fans.

The expansion screw is composed of screw expanding tube. The tail of screw is conical, the inner diameter of cone is larger than that of expansion pipe. When the nut is tightened, the screw rod moves outward, the conical part moves through the axial movement of the screw thread, thus forming a large positive pressure on the peripheral surface of the expansion pipe. In addition, the view point of the cone is very small, so that the wall, the expanded pipe the cone form a self-locking collision, so as to achieve the fixed function. The spring washer on the expanding screw is a standard part, because its opening is staggered has elasticity, so it is called spring washer. The function of spring washer is to use the sharp angle of staggered mouth to pierce into the flat cushion of nut to prevent the nut loosening. Flat gasket is also a standard part, its function is to evenly distribute the nut pressure on the connected parts.