Slip shaft/differential shaft
The slip shaft consists of main shaft, air expansion unit, expansion plate, spring, cross coupling and other parts. Also called friction shaft. The slip shaft is an important part of the lithium battery slitter (slitter). It is used to obtain the winding shaft of the slitter, and also used to unwind the winding shaft in special occasions. The purpose is to use the slip principle of each slip ring on the slip shaft to make multiple reels on the shaft, and always keep the constant tension for unwinding and unwinding. Its main purpose is to control the tension adjustment of materials in the winding process. By maintaining the proper tension of all coils during the operation of the winding shaft, the application of slip shaft winding for precious metal foil (copper foil, aluminum foil, etc.) has greatly improved the yield, reduced the production cost, and is a truly high efficiency product.
- Center air pressure slip shaft
It is a tension adjusted slip shaft, and the slip ring slips independently. Controlled by the tension system, compressed air with a certain pressure is sent to the shaft core to make the shaft core generate friction torque between the friction parts and slip ring, so as to achieve constant tension coiling. It can be applied to the range from very low tension to high tension. It is applicable to the requirements of 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 axis central coiling slitter.
The central pneumatic slip shaft is divided into pneumatic locking type and mechanical locking type. The central pneumatic slip shaft is composed of mandrel, slip ring, air bag, friction parts, sealing ring, etc.
1、 Start the locking type central air pressure slip shaft, which is a high-performance slip shaft. It can lock the core coil and generate friction torque at the same time of ventilation. It can realize full automatic unwinding, positive and reverse coiling, and no film breaking or unwinding during coiling.
Representative products: Japan Dongzhan slip shaft, Nishimura slip shaft. Its control accuracy is high and the cost is relatively high.
2、 Mechanical locking type central pneumatic slip shaft. Friction torque is generated by air pressure, and core locking is completed by mechanical eccentricity.
Representative products: ball type differential slip shaft, slice type differential slip shaft, Ba’er Iron type differential slip shaft, key type differential slip shaft, tooth type differential slip shaft. Germany, Britain, Italy and other European countries mostly adopt this structure, while some manufacturers in Taiwan and Japan also adopt this structure.
Features: stable performance, strong adaptability, durability, and relatively low cost.
- Pneumatic side pressure differential shaft
The principle and structure of the pneumatic side pressure slip shaft are basically similar to the mechanical side pressure slip winding. The difference is that the compression spring is changed to the cylinder compression, and the compression pressure can be adjusted digitally. With an electro pneumatic converter, the constant tension error is large. If a slip ring fails in the middle, the tension of the rear slip ring will be uncontrollable.
The advantage is that large air pressure can be applied by pressing the cylinder, so as to achieve high torque and high friction tension coiling.
- Mechanical side pressure slip ring
The mechanical side differential pressure shaft is mainly composed of a mandrel and a plurality of slip rings sleeved on the mandrel. The two ends of the slip ring are friction materials. A metal spacer ring is installed between the rings. The slip ring is closely attached to the end face of the spindle by the end face compression spring. The spindle rotates under the drive of the motor. Under the action of the end face friction, the slip ring rotates in turn to drive the core of the take-up cylinder and the coil fixed on the slip ring to rotate, completing the multi winding function. In order to control the tension and friction heat generation, there is a diameter detection device, which makes the take-up mandrel drive the linear speed of the coil surface to rotate at a speed 510% faster than the speed of the host machine. Under the effect of the slip ring, the material is coiled on the take-up shaft at the set tension value. The reeling applicability of this method is greatly improved compared with that of the air expansion shaft, and it is suitable for reeling materials with low speed (200M/MIN), certain thickness error, less reels and moderate tension. The disadvantage is that only constant torque control can be achieved, the tension error is large, and it can not adapt to high speed. The tension consistency is poor when multi winding. The biggest disadvantage is that tension adjustment can not be achieved during winding.
- Inflatable shaft
The air expansion shaft reeling is to fix the multi winding material cylinder core on one air expansion shaft, drive the reeling shaft with a torque motor or drive the reeling shaft with a combination of motor and magnetic particle clutch, so that the linear speed of the material surface on the reeling shaft is synchronized with the host machine to complete the multi winding function. This method has the advantages of simple structure, low cost and convenient unloading. It is suitable for coiling materials with smaller thickness error, fewer coils and larger tension, while it is not suitable for materials with larger thickness error, more coils and smaller tension. In serious cases, it cannot be coiled.