Control system loom transmission
Due to its simple weft insertion system and high strength of warp yarn raw materials, water-jet looms have high rotational speeds and high requirements for the main drive motor: high starting torque and fast braking reverse direction. torque, and at the same time, the frequent starting impulse current caused by frequent forward and reverse inching must be considered.
Due to the unique working environment (high humidity in the working environment), high insulation performance and sealing are required for the motor.
The water-jet loom motor must have a high starting torque to meet the initial beating force of the loom and avoid weft defects in the weaving fabric. In order to meet the rapid braking of the loom, the rotor of the motor must be able to withstand large torque.
There is a temperature switch inside the main drive motor to protect it from overheating.
The main drive motor must be lubricated regularly to ensure normal operation.
In order to ensure the normal startup and operation of the loom, the main drive motor shaft head is generally tapered. Different models have different tapers. During use or when replacing the pulley, be sure to ensure that there is sufficient contact surface between the pulley and the motor shaft.
In order to ensure sufficient starting torque and working torque of the water-jet loom, the main motor belt must have sufficient tension. A direct pressure tension meter is usually used for belt tension testing.
In order to ensure good fabric quality, water-jet looms must achieve precise positioning and braking. The braking of the water-jet loom includes the electromagnetic braking of the electromagnetic brake and the reverse braking of the main drive motor.
The water jet loom braking system must ensure that the beat-up axis stops within the range of 170°±20°, and must ensure that it stops at the weft after the weft breaking command is issued.
The braking system consists of electromagnetic brake, power supply and control circuit. As shown in Figure 3-38.
Water-jet looms generally use single-chip electromagnetic brakes (3-39). It consists of a moving plate (metal friction material) and a static plate (non-metallic friction material on the surface, with coils buried inside). Its structure is simple and easy to use. Electromagnetic brakes are divided into two forms: single coil and double coil according to the type of coil. The water-jet looms produced by Shenyang Hongda Textile Machinery Company (Shenyang Textile Machinery Factory) and Toyota Company (formerly Nissan Company) use single-coil electromagnetic brakes; the water-jet looms produced by Tsudakoma and Yinchun companies use double-coil type electromagnetic brakes. Electromagnetic brake, namely high voltage coil and low voltage coil.
The braking torque of the electromagnetic brake used in looms is generally between 160 and 350N m. When the speed of the loom is higher and the door width is wider, the braking torque required is greater.
When using the electromagnetic brake, the two base surfaces must be parallel, and the distance must be between 0.25 and 0.4mm. When using, be sure not to allow the two friction surfaces to be contaminated with oil and dust.
When the loom is in use, the brake clearance should be checked frequently and adjusted to ensure normal operation.
When the electromagnetic brake is in use, its lead cannot be grounded to avoid burning the output power tube. The ZW type water jet loom brake lead cannot be wired upside down, and its polarity cannot be changed.
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