Air compressor electrical joint control transformation

Xinjiang Nonferrous Metal Air Compressor Electrical Joint Control Reconstruction Liu Mingcai (Western Gold Yili Co., Ltd. Yining 835000) Axi Gold Mine Air Compressor Actual Operation in Zhuangzhuang 4 Air Compressors Simultaneously Start Up and Unloading Cannot Synchronize Leading Network The unstable pressure and the different measurement points of each air compressor pressure sensor will cause one of the air compressors to run at full load for a long time, which will easily reduce the service life of the equipment. To solve this problem, the four air compressors are jointly controlled. The transformation allowed four air compressors to unload at the same time to reach four air compressors and simultaneously operated to solve the problem. The long-time full-load operation of a single air compressor improved the service life of the air compressor.

1 Foreword The 4 screw air compressors currently used in our workshop can't realize the simultaneous loading and unloading function. The original working condition of 4 screw air compressors is as follows: 4 sets of machines will start at the same time. In the unloading state, the four machines started to work at one or several consecutive full loads. In order to improve the production efficiency and low cost of electricity in our workshop, it was decided to carry out the electronic control transformation of the four screw air compressors. The additional unloading relay of the fourth air compressor was used to control the other three air compressors to increase the unloading.

2 project improvement implementation program exchange 220 straight S24V power module DC 24V According to the PLC control method of 4 screw air compressors in the workshop, it is found that the increase and unloading of the screw air compressor depends on the pressure sensor of the air compressor. When the pressure sensor detects that the pressure is too high, it will give PLC an input signal. The i* air compressor is running at no load. At this time, the air compressor is in the unloading state and it is in the state of increasing load. Since 4 air compressors have 4 pressure sensors. The detection signals of the four sensors are installed in the exhaust ports of the respective air compressors, and the accuracy of the sensors is different. The air compressors that detect the low pressure are first detected to increase the load (full load operation) and the low pressure is detected. The air compressor start is in an unloaded state. Therefore, by extracting the sensor input signal of the air compressor, the four air compressors cannot be unloaded at the same time. The external circuit must control the unloading valve of the air compressor to increase the unloading of the air compressor at the same time. The specific design is as follows: 3 sets of air compressor tgm when power is increased, this Kis* èµƒ èµƒ èµƒ m m m m m éºŸ éºŸ2013This 2013201 is the output of three air compressor PLCs, which controls the load-increasing valve, so that the cylinder of the air compressor is continuously compressed, and the pressure of the pipe network is continuously improved. KA5 is the new intermediate relay and the fourth air compressor is added to the original line of the air compressor. The PLC output is increased to 5, so that the \5 intermediate relay is always open. "KA1 intermediate relay coil is energized" KA1 normally open The point closure controls the power supply of the other 3 air compressor load-up valves lSBDVBDVBDV, so that the three air compressors are also loaded. In this state, the No. 4 air compressor is used as the other three air compressors in the main chamber to simultaneously increase the unloading to achieve a short loading time and improve the service life of the equipment.

It can be seen that when the gas load is low, the sensors of the SB å…³ SB working mode can be used to detect the respective Htn pressures to the PLC input signals.

3 Conclusion In the above, the operating conditions of simultaneous unloading are achieved by selecting the PLC output of one air compressor to control the other three air compressors. Technically improved the problem that the detection signals of the four air compressor pressure sensors are not synchronized, avoiding the state that a certain air compressor is always fully loaded and holding the service life of the equipment, and also provides a reliable supply for the production of our workshop. The gas pressure greatly improves the production efficiency. The cost of electricity has proved that the use effect is very good and worth promoting.

Gravity Casting Parts

"Gravity Die Casting. A permanent mould casting process, where the molten metal is poured from a vessle of ladle into the mould, and cavity fills with no force other than gravity, in a similar manner to the production of sand castings, although filling cn be controlled by tilting the die."

Gravity Die Casting

Sometimes referred to as Permanent Mould, GDC is a repeatable casting process used for non-ferrous alloy parts, typically aluminium, Zinc and Copper Base alloys.

The process differs from HPDC in that Gravity- rather than high pressure- is used to fill the mould with the liquid alloy.

GDC is suited to medium to high volumes products and typically parts are of a heavier sections than HPDC, but thinner sections than sand casting.

There are three key stages in the process.

The heated mould [Die or Tool] is coated with a die release agent. The release agent spray also has a secondary function in that it aids cooling of the mould face after the previous part has been removed from the die.
Molten metal is poured into channels in the tool to allow the material to fill all the extremities of the mould cavity. The metal is either hand poured using steel ladles or dosed using mechanical methods. Typically, there is a mould [down sprue" that allows the alloy to enter the mould cavity from the lower part of the die, reducing the formation of turbulence and subsequent porosity and inclusions in the finished part.
Once the part has cooled sufficiently, the die is opened, either manually or utilising mechanical methods.

Advantages

Good dimensional accuracy
Smoother cast surface finish than sand casting
Improved mechanical properties compared to sand casting
Thinner walls can be cast compared to sand casting
Reverse draft internal pockets and forms can be cast in using preformed sand core inserts
Steel pins and inserts can be cast in to the part
Faster production times compared to other processes.
Once the tolling is proven, the product quality is very repeatable.
Outsourced Tooling setup costs can be lower than sand casting.

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