Control of flow and pressure of overflow dyeing machine
Jun 04, 2021
Flow rate and pressure are two important parameters of the overflow dyeing machine, which are determined by the main circulating pump. The flow is necessary to ensure the dyeing exchange between the dye and the fabric, and it must be large enough. In a specific dyeing process, the change should be as small as possible. It is completely controlled by the main pump. For the overflow jet dyeing machine, the pressure refers to the pressure generated by the nozzle; for the cheese dyeing machine, it refers to the pressure difference between the inside and outside of the cheese, but the total pressure is still provided by the head of the main pump.
In the dyeing process, flow and pressure play a very important role. Different fabrics and processes have different dye flow and pressure (jet force or pressure difference). For example, comparing high-count fabrics with large surfaces and fast dyeing processes, the flow rate requirements are large; for light fabrics and fabrics with delicate surfaces, small jetting force is required; and for fabrics with a large weight, it is required to have sufficient The flow rate, but also have a strong jet force. Therefore, the flow rate and pressure should vary according to different fabrics and processes.
The traditional overflow dyeing machine, in order to meet the changes in flow and pressure, is controlled by the shut-off adjustment of the outlet of the main pump. Because this control method is affected by human factors, it is not accurate enough; at the same time, the main circulating pump does not work at the optimal working conditions, and the efficiency is reduced. According to the characteristic curve of the main pump, within a certain speed adjustment range, the rotation speed of the main pump is changed through AC frequency conversion to achieve changes in flow and head to meet the requirements of different dyeing processes, so as to ensure that the main pump is always at the optimal flow rate and curve. Work on the best working conditions to save energy.
As for the specific determination of flow and pressure, you can set flow or pressure detection, and realize automatic control through PLC processing. Set in the PLC, users only need to select the corresponding parameter menu according to the fabric they dyed.