Improvement of Energy Saving Efficiency of Air-fan of Glass Washing and Drying Machine
1. The working principle of glass washing and drying machine
The washing process of the glass washing machine seems simple, but its working principle is very complicated. The horizontal flat glass washing machine is what we usually call a special glass washing and drying machine. It is generally cleaned by the method of pre-washing-washing-drying.
First of all, it puts the glass on the conveyor table in front of the washing machine, first passes through a pre-washing spray, and then automatically transfers to the brushing room.
Secondly, scrub with a brush that is automatically sprayed with water. After that, enter the flushing room for flushing. This is a deep washing of the glass and usually requires R0 water for rinsing. The last is the air-drying process. The air path system is composed of the compressed air from the blower and sent to the upper and lower cold air knives and the upper and lower hot air knives respectively through the air distributor. The distance between the upwind knife and the glass plane can be adjusted. When changing the thickness of the glass, you must pay attention to adjusting this distance. When air-drying, pay attention to the conveying speed of the radial channel of the cleaning machine, and adjust different speeds according to different glasses to ensure the cleaning effect of the glass surface.
For this key equipment, improve its energy-saving effect to reduce the overall energy consumption loss of the glass washer. Since the main energy consumption of the glass washer is at the fan, if the washer is running without glass washing, it can reduce its operation. Energy saving can be achieved.
2. The energy-saving improvement plan of glass washing and drying machine
2.1 Improvement of air duct mechanical control
After the glass is cleaned, it must be dried quickly. If the air duct valve is redesigned on the original air outlet line to control the blowing time and reduce the energy consumption of the fan, the overall energy consumption of the glass washing and drying machine can be reduced to achieve the best energy-saving effect.
2.1.1 New control air duct valve
The newly added control air duct valve is shown in Figure 1. Pay attention to making its size consistent with the size of the equipment air duct for easy connection. It is mainly composed of 9 components, which is also an important mechanical control link in this design scheme.
Note:
① Cylinder mount,
② Cylinder,
③ Connector,
④ Transmission turning shaft,
⑤ Duct.
⑥ Install the support frame,
⑦ Flip the valve,
⑧ Bearing seat,
⑨ Solenoid valve YV.
Figure 1 Newly added control air duct valve
2.1.2 Simple control method of the mechanical part
The control method is to control the lifting and shrinking of the cylinder structure by the solenoid valve YV, to control the opening and closing of the valve. Its action directly affects the blowing effect of the fan. It is necessary to ensure that the valve is fully opened and the air output reaches the blowing capacity when the mechanical part is not installed. The simulation action is shown in Figure 2. When the solenoid valve YV is powered on, the cylinder is closed and the valve is closed; when the solenoid valve YV is powered off, the cylinder is opened and the valve is opened.
Figure 2 Control Mode
2.2 Improvement of air duct electrical control
The traditional electrical control is mainly the relay contact type, which has the advantages of simple structure, low price, easy maintenance, and strong anti-interference ability. This article is going to introduce is to control the opening and closing of the air duct valve through a simple electrical control circuit.
2.2.1 Electrical Control Arrangements
After the design of the mechanical valve is completed, it is necessary to use an electrical circuit to control the opening and closing of the valve. It is necessary to use a combination of electrical components to meet the automatic control of the mechanical valve and design the control mode of the components according to the direction of the glass cleaning operation. The plane layout is shown in Figure 3.
Note: The photoelectric switch SQ1 is the inlet electric eye, the photoelectric switch SQ2 is the outlet electric eye, and YV is the electromagnetic switch of the air duct valve.
Figure 3 Electrical control layout
It should be noted that there is a pre-spray device in the transition section of the upper part of the washing machine, and water splashes will splash out when the glass is pre-sprayed. Therefore, waterproof measures must be taken for the entrance photoelectric switch SQ1 to prevent electrical components from being damaged by contact with water.
2.2.2 Electric control circuit
According to the relationship between SQ1, SQ2, and YV in Figure 3, to achieve the purpose of automatic control, the intermediate relays KAI and KA2 are used as the control points, and the time delay device KT is used to control the opening and closing of the mechanical valve.
Duct valve delayer inlet electric eye outlet electric eye
Note: The photoelectric switch SQ1 is the inlet electric eye, the photoelectric switch SQ2 is the outlet electric eye, YV is the electromagnetic switch of the air duct valve, KT is the time delay device, KA1, and KA2 are the intermediate relays, and AC/DC is the 24V switching power supply.
Figure 4 Electrical control circuit
2.2.3 Action description of the control loop
The basic description of the electrical control is as follows. Firstly, the AC voltage 220V is converted to 24V DC control voltage through the AC/DC switch. When SQ1 and SQ2 are not in action, the time delay device KT is energized, making a group of normally open contacts (6, 8) act and pull in, the solenoid valve YV is energized, the valve is closed, and the damper is closed without blowing air; When the timer KT loses power, its normally open contact (6, 8) does not act, the solenoid valve YV loses power, the valve opens, and the damper starts to blow air. After the glass is released from the entrance sensor SQ1, the time delay device KT starts with a delay (the delay setting time is determined according to the actual glass production speed and size), the damper continues to be kept open, and the glass continues to be conveyed. , so that its normally open contact (6, 8) does not act, the solenoid valve YV loses power, the valve continues to open, the damper starts to blow air normally until the glass is disengaged from the outlet electric eye SQ2, the damper is closed, the glass transmission is completed, and the glass cleaning process completes the glass cleaning task.
3. The purpose and benefit of fan energy saving effect
During normal glass cleaning, the sheets are fed continuously. During this period, the fan is continuously charged and works normally. The fan energy-saving improvement plan is to reduce the energy consumption of the no-load operation of the washing and drying machine when there is no glass passing by.
During this process, the reduction of energy consumption mainly depends on the glass edging speed and the time between the glass entering the electric eye SQ1 at the entrance of the washing machine. The longer the standby time, the less wasted energy consumption, the less power loss is generated, and the overall wear rate of the equipment is also reduced.
4. Epilogue
With the rapid development of science and technology, LIJIANG Glass always pays attention to improving the preparation process of obsolete production equipment, perfecting the production process, and developing a superior production mode. In the process of equipment production, we should actively observe and discover energy-saving efficiency points, and then take corresponding solutions to improve the energy-saving efficiency of equipment.
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