Replace the hand crank
1. Generally, lifting clothes drying racks have three sets of pulleys, which are divided into low pulleys (also called bases, with upper and lower wheels) and rear pulleys. (also called base, with only one wheel) and steering wheel (also called universal wheel, usually with four wheels).
2. Hold the two ends of the steel wire and pass it through the two wheel grooves of the steering wheel from bottom to top, and then pull the two ends of the steel wire to pass through the upper and lower sides of the front pulley on the same side. At this time, pay attention to the direction of the wheel groove. After passing the steel wire head, check whether the two steel wires cross (look at the position between the steering wheel and the front pulley). If the steel wires cross (they will not cross on the same plane), it means that they are threaded incorrectly. Exchange them up and down. That's it.
3. Then pass the steel wire through the wheel groove under the front pulley and directly connect it to the hanging ball. Pass the steel wire through the horizontal wheel groove of the front pulley and then pass through the rear pulley on the same side and then connect the hanging ball. ; Use the same method to solve the other steel wire; finally, the steel wire under the steering wheel is of course the hand crank.
Extended information:
Classification
Steel wire ropes can be classified according to rope-making wire material, surface condition, twisting method and wire rope usage.
Classification according to material
1. Carbon steel wire rope is twisted from high-quality carbon structural steel wire.
2． Stainless steel wire rope, manufactured and twisted from stainless steel wire as raw material
Classified according to surface condition
1. Phosphated coated steel wire rope (Chinese patent), referred to as phosphated steel wire rope, rope making The weight of the steel wire phosphate film is 3-60 grams/square meter. After phosphating, the steel wire is not cold drawn before twisting. Strands, steel cores and steel wire ropes are directly twisted. The phosphate film can improve the wear resistance of the surface of the rope-making steel wire. , corrosion resistance, effectively inhibiting the occurrence of fretting fatigue. For the phosphating treatment of rope-making steel wires, manganese or zinc-manganese phosphating is preferred. No drawing processing is performed after the phosphating of the steel wires. The phosphated steel wires are used directly to twist the steel wire ropes. The phosphating coating makes the surface of the steel wire more wear-resistant. Moreover, the phosphate film is non-conductive and can simultaneously improve the corrosion resistance of the steel wire. The service life of the phosphated steel wire rope is 2-3 times that of the smooth steel wire rope, and the fatigue resistance of the steel wire rope is greatly improved. Phosphated steel wire rope is not only an ideal substitute for smooth steel wire rope, but also fully capable of replacing imported steel wire rope.
2. Galvanized steel wire rope, including hot-dip galvanizing and electro-galvanizing. The protection of the steel wire by the galvanized layer is anode protection. The thicker the galvanized layer, the stronger the anti-corrosion ability
3. Plastic-coated steel wire rope, the outer surface of the steel wire rope or the outer surface of the strand is coated with a certain thickness of plastic, including polyethylene, polypropylene, polyurethane, etc.
4. Smooth steel wire rope, which has been heat treated and surface The rope-making steel wire is obtained after cold drawing of the prepared raw materials (note: the phosphate film formed during the pretreatment process gradually falls off due to intense friction with the drawing die during the cold drawing process). The steel wire does not undergo any surface treatment and is directly twisted into a strand rope. Steel core and steel wire rope were produced abroad in 1834 and domestically in 1939 by Tianjin No. 1 Steel Wire Rope Factory.
Classified by twisting method
Single-strand rope
Also called single-twist rope, it is made of rope-making steel wires twisted around a central wire or hemp core , can twist one or more layers of steel wire.
Double-twisted rope
It is made of double-stranded ropes twisted around a rope core (steel core or fiber core). It can twist one or more layers of steel wire and is the most widely used Types of wire ropes.
Triple-twisted rope
Double-twisted rope is used as a strand and twisted around the rope core. It is mainly used for thick-sized steel wire ropes with a diameter of more than 60mm, such as offshore steel wire ropes.
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The method of marking the twisting method of the wire rope is as follows:
aRight alternate twist ZS: the rope is twisted to the right, the strand is twisted to the left, the twist direction of the strand rope is opposite to the twist direction of the steel wire in the strand, it is called cross twist
b Left alternate twisting SZ: The rope is twisted to the left, the strand is twisted to the right
c Right twisting in the same direction ZZ: The rope is twisted to the right, the strand is twisted to the right
d Same as the left Side twist: The rope is twisted to the left, the strands are twisted to the left
e Right mixed twist: The rope is twisted to the right, some strands are twisted to the left, and some strands are twisted to the right
f Left mixed twist: The rope is twisted to the left , some strands are twisted to the right, and some strands are twisted to the left
State classification
According to the contact state between adjacent layers of steel wires in the strand, it is divided into three types: point contact, line contact or surface contact. .
① Point-contact steel wire rope: The diameters of the steel wires in the strands are all the same, the twist angles between the steel wires in each layer are the same, and the lay distances are different, so the inner and outer wires cross each other and are in point contact.
②Line contact steel wire rope: The lay distance of each layer of steel wires in the strand is the same but the twist angle is different. The inner and outer steel wires are in contact with each other on a spiral line, showing a line contact state. Under the same conditions of use, the service life of line contact wire ropes is longer than that of point contact wire ropes.
③ Compacted steel wire rope, formerly known as surface contact steel wire rope. During the twisting process of the steel wire rope, after forging, drawing, etc., a contact surface is formed between the steel wires, including strand rope compaction and wire rope compaction. and double compaction of rope strands, etc.
④Sealed steel wire rope: The outer layer is made of special-shaped steel wire, including T-shaped, S-shaped, and Z-shaped cross-section steel wires. It has a smooth surface and good wear resistance. Compared with other types of steel wire ropes of the same diameter, it is more resistant to wear and tear. It has high tensile strength and can withstand lateral pressure, but has poor flexibility, complicated processes, and high manufacturing costs. It is often used as load-bearing cables, such as cables on cable cranes and aerial ropeways.
Reference materials:
Wire rope_Baidu Encyclopedia