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Nishimura slip shaft
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Model: West Village
Packing quantity: 1 / wooden box
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Slip shaft, also known as friction shaft. It is used in the winding shaft of slitting machine, and it is also used in unwinding shaft in special occasions.
Using the principle of slippage of each slip ring on the slip shaft, multiple reel materials on the shaft are always kept at a constant tension for unwinding and unwinding.
The slitting machine is a device that divides a roll of roll material into multiple rolls, which is widely used.
The function of the rewinding shaft is to divide the multi-reel material of various materials from the core to the outer layer uniformly, neatly, and wound on one or two shafts with constant tension. However, due to the uneven thickness of the material itself, there is a certain thickness error. After the coil is continuously coiled, the diameter of each coil produces a larger accumulated error. This leads to a greater difference in the winding speed of each strip and a greater difference in tension.
The coil material is uneven and the end surface is uneven. In severe cases, the material is damaged and scrapped due to excessive tension, especially the polyester film, which has a large thickness error and a large elongation rate, which is easy to stretch and deform and cause waste products.
The slip shaft has a special structure and is composed of multiple slip rings, which can overcome the above phenomenon. When working, the slip ring is controlled to slip with a certain slip torque value (torque), and the slip amount just compensates for the resulting speed difference, thereby accurately controlling the tension of each roll of material, enabling constant tension winding, ensuring winding. quality.
With the improvement of people's living standards and the development of science and technology, higher and higher requirements are placed on flexible packaging products, the elongation requirements of films are getting smaller and smaller, and the regularity of the winding end is getting higher and higher. Tension control puts forward higher requirements.
The tension control accuracy of the winding shaft directly determines the elongation of the slitted product and the uniformity of the end surface, so it is necessary to use a slip shaft.
The use of slip shafts, the speed of the slitter, the accuracy of winding, the degree of automation, the reduction of preparation time, and the humanization of the operation can be improved. In particular, a variety of cast polyester thin materials with poor tensile resistance and large thickness errors use slip shafts.
The difficulty of winding is reduced.
The use of slip shafts for winding up precious metal foils greatly increases the rate of genuine products and reduces production costs.
Special production costs. Special paper is the earliest application of this technology.
Slip shafts have been widely used in plastic films (including electronics, capacitors, battery films, cling films, packaging, composite films); metal foil (copper foil, aluminum foil, etc.); paper rolls; PVC sheet roll material slitting and rewinding . At present, it is continuously extended to other fields, other industries, and slitting and rewinding of other special materials.
The form of winding is center winding, surface winding, and surface center winding. The following focuses on the center winding take-up receiving shaft,
There are four main structural forms:
Central air pressure slip shaft,
Pneumatic side pressure slip shaft,
Mechanical side pressure slip shaft,
(1) Central air pressure slip shaft
It is a tension-adjustable slip shaft. The slip ring slips independently. Controlled by the tension system, the compressed air with a certain pressure is passed to the shaft core,
The shaft core generates friction torque between the friction member and the slip ring to achieve constant tension winding. It can be applied in the range from extremely low to the highest tension. It is suitable for high speed, large material thickness error, multi-section tension control, high tension control accuracy, and neat end winding.
It is most suitable for the use of double-shaft center winding type slitting machine.
The central air pressure slip shaft is divided into pneumatic locking type and mechanical locking type.
The central air pressure slip shaft is composed of core rolls, slip rings, air bags, friction parts, sealing rings, etc.
One, start the locking type central air pressure slip shaft,
It is the highest performance slip shaft. It can lock the core roll and generate friction torque while ventilating. It can realize automatic unwinding, forward and reverse winding, and the film is not unwound and not offset during the winding.
Japan's east extension slip axis, Nishimura slip axis. Its control precision is high and the cost is relatively high.
Second, mechanical locking type central air pressure slip shaft.
The friction torque is generated by air pressure, and the winding core is locked by mechanical eccentricity.
Representative products: ball slip slip shaft, Kataoka slip slip shaft, Fuji iron slip slip shaft, key slip slip shaft, tooth slip slip shaft
Poor shaft. Germany, Britain, Italy and other European countries mostly adopt this structure. Some factories in Taiwan and Japan
The family also adopted this structure.
Features: stable performance, strong adaptability, durability, and relatively low cost.
(2) Pneumatic side pressure slip shaft
Pneumatic side pressure slip shaft,
The principle and structure are basically the same as the mechanical side pressure slip type winding, the difference is that the compression spring is changed to the cylinder compression, the compression pressure can be digitally adjusted, and the electro-pneumatic converter can achieve a large constant tension error. If a slip ring fails in the middle,
It will lead to the defect that the tension of the rear slip ring cannot be controlled.
The advantage is that by pressing the cylinder, a larger air pressure is applied, thereby realizing a large torque and a large friction tension winding.
(3) Mechanical side pressure slip ring
The mechanical side pressure slip shaft is mainly composed of a mandrel and a plurality of slip rings sleeved on the mandrel.
The two sides of the slip ring are friction materials, and a metal spacer ring is installed between the rings. The slip ring is closely attached to the end surface of the mandrel by the end face compression spring.
The mandrel rotates under the drive of the motor, and sequentially drives the slip ring to rotate under the action of the end surface friction force, and drives the rotation of the core and the material roll fixed on the slip ring to complete the multi-roll rewinding function.
In order to control the tension and friction to generate heat, there is a diameter detection device, so that the linear speed of the material mandrel driving the surface of the material roll is faster than the speed of the host
5 ~ 10% speed rotation, under the action of slip ring, the material is wound on the take-up shaft with the set tension value.
The applicability of this method of rewinding has been greatly improved compared with the inflation shaft. It is suitable for low-speed (200M / MIN), with a certain thickness error, fewer coils, and moderate tension. The disadvantage is that it can only achieve constant torque control, the tension error is large, and it cannot adapt to high speed. The consistency of the tension is poor when multi-winding. The biggest disadvantage is that the tension cannot be adjusted during the winding process.
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