Application requirements of veneer hot press

Application requirements of veneer hot press

1. Check and adjust during operation

1. Adjust the time of the time controller appropriately according to the thickness and quality required by the reconstituted board (notify the blank assembly process to adjust the blank assembly process if necessary);

2. Check the heat transfer oil pressure and hot plate temperature, whether there is oil leakage in the pipeline, and pay attention to the speed of temperature rise of hot plate after closing;

3. Check whether the pressure rise, pressure hold and pressure drop in each pressurization stage meet the pressure and duration required by the process, and adjust relevant institutions in time;

4. Check whether the lifting, pushing and pulling stroke of the loader is appropriate and whether the operation is stable;

5. Check the piston sealing ring and pipeline for oil leakage;

6. Check the operation coordination of each conveyor of the backing plate circulation system.

2. Shutdown procedure

1. When the plate loader sends the next batch of wet slab into the hot press, stop the plate loader and the plate feeding conveyor;

2. When the hot press unloads the next batch of plates, stop each oil pump motor and open the bypass circulating valve;

3. When the plate unloader has finished unloading the plate, stop the plate unloader and the backing plate conveyor, and turn off the main power switch.

3. Lubrication requirements

1. The rolling bearing adopts No. 4 calcium base grease, and the oil shall be cleaned and changed every 6 months;

2. The guide plate and No. rail shall be coated with composite calcium base grease once a week;

3. The oil pump adopts 46 anti-wear hydraulic oil, which is cleaned and changed every 6 months (the old oil can be filtered);

4. The pulley chain and other parts shall be filled with No. 30 engine oil every 24 hours.

4. Requirements before starting

1. Check whether the screws are loose and tighten them in time;

2. Check the oil level of the accumulator, the oil level of each oil tank and the lubrication of each lubricating part;

3. The temperature of the hot pressing plate meets the process requirements, the heat transfer oil has no leakage, and the nitrogen pressure of the accumulator is normal without air leakage;

4. The surface of the hot press shall not be stained with wood bundles and other dirt;

5. Requirements during operation

1. The piston of the press and loader shall rise and fall stably without shaking and crawling, and the piston sealing ring shall have no oil leakage when reaching high pressure;

2. Each oil pump shall be free from abnormal noise and vibration, and the temperature rise of pump and oil shall not exceed 65 ℃;

3. The load and temperature rise of each motor shall not exceed the provisions;

4. The positioning switch of loader is sensitive;

5. The opening and closing action of the unloader hook is correct and the response is sensitive;

6. There is no oil leakage at the joint of heat transfer oil hose;

7. The temperature of the hot press is basically the same as that of the return oil of the heat transfer oil, and the oil inlet and return valves operate normally;

8. During automatic pressure rise and fall, the response of unloading valve, solenoid valve and electrical components is correct and sensitive;

6. Regular maintenance

1. Check the whole machine every 6 months (according to the requirements of assembly and commissioning);

2. Wear and corrosion on the surface of large piston and loader piston, especially the section intended to seal the ring when it is placed high;

3. Whether all parts are consistent when the hot pressing plate is heated (whether the internal heat transfer oil channel is blocked);

4. Wear of large and small sealing rings of all hydraulic systems and wear of all valve cores, springs and valves;

5. Wear of gears, pulleys and guide rails;

6. Wear and sealing of internal parts of each oil pump;

7. Horizontal position and foundation of base and frame.

Keyword: veneer hot press

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