2.1 Particleboard production line
2.1.1 Comparison of advantages and disadvantages of single-layer large-format hot press and multi-layer hot press (1) Thickness tolerance of particleboard pressed by single-layer hot press is fine, the density distribution of the plate is uniform; and the thickness of the multi-layer hot press is not Prejudice is in the hot platen. During the working process, the thickness of the plate in the middle and out of the plate is easy to bond the wood chips, which affects the tolerance of the plate thickness. The density distribution of the finished plate is uneven after sanding with a sanding machine. In addition, the thickness gauge on the hot press plate of the multi-layer laminating machine is subjected to a large pressure at the end of the forming of the plate, especially in the case where the thickness of the paving slab is uneven, the force is greater, and the hot plate is deformed, and the pressed product is pressed. It is also deformed and shaped into an arc shape. If the thickness tolerance of the finished board is to be ensured, the amount of sanding is also increased. In addition, the plain board which is uneven in the density of the finished board is subjected to secondary veneer processing, which may cause internal stress in the board. Eventually, peeling occurs. Therefore, the quality of the multi-lamination machine is generally lower than that of the single laminating machine, and the price is only about half or two-thirds of the price of the single laminating machine. The price of the single laminating machine is close to the selling price of the medium density fiberboard product of the same thickness;
(2) The edge loss of the multi-layer hot press is larger than that of the single-layer hot press, and the material utilization rate is low. Because each multi-layer hot press machine needs to cut four sides, and the single laminating machine only cuts the whole large and four sides, generally with the output of the annual production of 50,000 cubic meters of production line, the multi-layer machine's trimming loss is single 3.5 times the laminating machine;
(3) The multi-layer hot press has a large opening, a long closing time and a long auxiliary time, and the board is closed in the middle of the hot plate for a long time, and the pre-cured layer is thick and the amount of sanding is large; and the single laminator has a small opening. The auxiliary time is short, the pre-cured layer is thin, and the amount of sanding is small. In terms of 16 mm thickness, the amount of sanding is only one third of that of a multi-layer laminator.
(4) The hydraulic rotating medium of the single laminator provided by Hewlett-Packard Co., Ltd. is a water-based emulsion, which is less than one-tenth of the cost of the transmission hydraulic oil for multi-lamination machines. Single laminator control is simple to operate, the operator only needs to pay attention to a slab; if a slab is not properly operated, it will inevitably affect the work cycle or produce waste. Coupled with the automatic detection of the single laminator, it is easy to meet the automated production under unmanned control;
(5) The single-layer hot press provided by Hewlett-Packard Co., Ltd. is the technology imported from Germany Bisong Company through technology introduction, and the application of new technology is improved, the production process is mature, the failure rate of hot press machine is low, no device Long life and low maintenance cost. All domestically produced 50,000 cubic meters single laminating machine production line is provided by Shenzhong Company. It is currently the only domestic manufacturer that can produce such design scale equipment;
(6) Since the single-layer hot press removes the medium as a water-based emulsion, the multi-layer hot press is prevented from using hydraulic oil as a medium. Due to maintenance and leakage, oil and wood chips remain on the high-temperature hot press, which may cause fires, etc. Unfavorable factors. Therefore, a single layer hot press can improve the safety of production;
(7) The products produced by the single laminating machine are large-format specifications, which can be cut into non-standard sizes and different specifications according to the needs of users, to meet the needs of users; and the multi-lamination machine product has a single specification;
(8) The slab of the single laminating machine is laid on the metal mesh belt, the transportation distance is short, and the pre-pressing machine is not used, and the slab and the mesh belt directly enter the hot press, and the symmetry of the thickness of the paving slab is not easily symmetrical. Bad, the finished board is invariant; while the multi-lamination machine has a long transport distance, it is necessary to switch a plurality of transport machines and perform hot press machine loading, etc., the slab multi-layer is twisted and pulled, and the slab thickness symmetry is laid. , easy to cause the finished board to warp and deform due to poor thickness symmetry;
(9) Because the single laminator has a large format, it has a large area, but since the pre-pressing machine and some transporters and plate loading machines are not required, the length of the entire paving is relatively small.
2.1.2 Large-scale single-layer hot press production line new technology application, equipment improvement and production practice application (1) Airflow paving machine · Change the original closed-loop airflow system to the external circulation airflow system, avoiding the inner circulation airflow to the air distribution pipe The blockage improves the reliability of the equipment and reduces the maintenance cost. · Improved the structure of the flat shaving vibrating screen in the paving room and re-determined the optimal position and improved the paving surface quality.
(2) The lifting and lowering of the moving beam of the hot press is controlled by the original pure synchronous cylinder to be synchronously controlled by the synchronous cylinder and the mechanical linkage;
(3) The original thickness detecting device of the hot press is controlled by the original dial contact type to the electronic rotating track encoder, which improves the control precision and can fully realize the automatic control;
(4) All hydraulic system seals adopt new foreign technology to ensure the reliability of the seal;
(5) The pilot valve of all liquid systems adopts new German technology to improve the reliability of use and reduce operating costs;
(6) In order to increase the output, the original auxiliary speed and the pressing feed rate are nearly doubled. Mainly to increase the motor power, and change the original mechanical adjustment to variable frequency speed regulation;
(7) Improve the rotation speed of the longitudinal saw blade, improve the sawing quality of the board, and change the sawing feed speed to variable frequency speed regulation to meet the requirements of different thicknesses;
(8) Improve the structure of the horizontal saw sawing feed plate so that the push plate does not affect the vertical saw sawing when the push plate is retracted, reducing the auxiliary time. Achieve the purpose of increasing production;
(9) The metering of the dried shavings after the improvement adopts the on-line measurement of the microcomputer control, that is, the original volume measurement is changed to the weight measurement;
(10) The glue supply system uses the weight loss method to measure the glue output, and the glue supply amount is accurate;
(11) Cooperating with the School of Mechanical Engineering and Automation of Northeastern University, the drying of shavings uses a three-channel drum dryer;
(12) Swedish firefly infrared temperature control spark detection and fire extinguishing system can be set on the drying pipeline.
2.2 MDF production line a, new non-standard large format (6'×16') pre-installed-----installation-----hot press unit;
b. Technical characteristics of the medium density fiberboard production line of the heavy machinery group.
(1) Large-format forming hot pressing (exporting Russian project), producing 6'×16' large-format finished board, which has wider application;
(2) The process of installing the board machine with pre-installed machine, the equipment structure is simple, the weight is light, and the board is stable and reliable. The auxiliary time is short. Overcome the "bottleneck" phenomenon of multi-lamination machine board, making the annual output stable and reliable, and breaking through 100,000 cubic meters (the original design capacity is 96,000 m3 / a);
(3) New vacuum negative pressure-----mechanical paving;
(4) The hydraulic system is carefully designed and configured to close the pressurization time: ensure that the pressurization process is completed within less than 20 seconds, and the installed power is low. The system adopts the international advanced pump valve system and optimized design of the integrated block and charge. The liquid valve is simple to install, easy to maintain and reliable to use.
(5) The hot grinding machine and sanding unit are equipped with internationally advanced models: the hot mill is the full-opening pressure type of Andritz in Austria;
The sander is Swiss Stenemann2+4 inclined roller type;
The fiber quality and the final surface quality of the product are ensured.
(6) Perfect on-line inspection is to fully automate the quality control of the production line and ensure the execution of process parameters, mainly installing the online density/water content detector;
(7) Carefully design the three-stage dust removal system to ensure the environmental protection requirements of the production line;
(8) The newly designed large-diameter low-mixing ratio low-temperature pipe dryer overcomes the shortcomings of pre-curing of the sizing part due to excessive temperature and ensures the stability of the production line;
(9) All motors and reducers adopt German SEW company products to ensure the stability of the production line;
(10) Designing the use of thermal energy centers, using bark, sanding powder, and waste water as fuel, and treating hot-milled wastewater and hot-pressed waste gas to carry out comprehensive environmental protection;
(11) The whole line electrical control system adopts PLC automatic control;
(12) The sizing quantity system adopts the new “weight loss method†to reduce the amount of measurement, which avoids the glue being adhered to the barrel wall after a long time of use, resulting in inaccurate measurement. (13) Adopt Swedish firefly infrared temperature detection fire extinguishing system to ensure safe and accurate operation.
2.1.1 Comparison of advantages and disadvantages of single-layer large-format hot press and multi-layer hot press (1) Thickness tolerance of particleboard pressed by single-layer hot press is fine, the density distribution of the plate is uniform; and the thickness of the multi-layer hot press is not Prejudice is in the hot platen. During the working process, the thickness of the plate in the middle and out of the plate is easy to bond the wood chips, which affects the tolerance of the plate thickness. The density distribution of the finished plate is uneven after sanding with a sanding machine. In addition, the thickness gauge on the hot press plate of the multi-layer laminating machine is subjected to a large pressure at the end of the forming of the plate, especially in the case where the thickness of the paving slab is uneven, the force is greater, and the hot plate is deformed, and the pressed product is pressed. It is also deformed and shaped into an arc shape. If the thickness tolerance of the finished board is to be ensured, the amount of sanding is also increased. In addition, the plain board which is uneven in the density of the finished board is subjected to secondary veneer processing, which may cause internal stress in the board. Eventually, peeling occurs. Therefore, the quality of the multi-lamination machine is generally lower than that of the single laminating machine, and the price is only about half or two-thirds of the price of the single laminating machine. The price of the single laminating machine is close to the selling price of the medium density fiberboard product of the same thickness;
(2) The edge loss of the multi-layer hot press is larger than that of the single-layer hot press, and the material utilization rate is low. Because each multi-layer hot press machine needs to cut four sides, and the single laminating machine only cuts the whole large and four sides, generally with the output of the annual production of 50,000 cubic meters of production line, the multi-layer machine's trimming loss is single 3.5 times the laminating machine;
(3) The multi-layer hot press has a large opening, a long closing time and a long auxiliary time, and the board is closed in the middle of the hot plate for a long time, and the pre-cured layer is thick and the amount of sanding is large; and the single laminator has a small opening. The auxiliary time is short, the pre-cured layer is thin, and the amount of sanding is small. In terms of 16 mm thickness, the amount of sanding is only one third of that of a multi-layer laminator.
(4) The hydraulic rotating medium of the single laminator provided by Hewlett-Packard Co., Ltd. is a water-based emulsion, which is less than one-tenth of the cost of the transmission hydraulic oil for multi-lamination machines. Single laminator control is simple to operate, the operator only needs to pay attention to a slab; if a slab is not properly operated, it will inevitably affect the work cycle or produce waste. Coupled with the automatic detection of the single laminator, it is easy to meet the automated production under unmanned control;
(5) The single-layer hot press provided by Hewlett-Packard Co., Ltd. is the technology imported from Germany Bisong Company through technology introduction, and the application of new technology is improved, the production process is mature, the failure rate of hot press machine is low, no device Long life and low maintenance cost. All domestically produced 50,000 cubic meters single laminating machine production line is provided by Shenzhong Company. It is currently the only domestic manufacturer that can produce such design scale equipment;
(6) Since the single-layer hot press removes the medium as a water-based emulsion, the multi-layer hot press is prevented from using hydraulic oil as a medium. Due to maintenance and leakage, oil and wood chips remain on the high-temperature hot press, which may cause fires, etc. Unfavorable factors. Therefore, a single layer hot press can improve the safety of production;
(7) The products produced by the single laminating machine are large-format specifications, which can be cut into non-standard sizes and different specifications according to the needs of users, to meet the needs of users; and the multi-lamination machine product has a single specification;
(8) The slab of the single laminating machine is laid on the metal mesh belt, the transportation distance is short, and the pre-pressing machine is not used, and the slab and the mesh belt directly enter the hot press, and the symmetry of the thickness of the paving slab is not easily symmetrical. Bad, the finished board is invariant; while the multi-lamination machine has a long transport distance, it is necessary to switch a plurality of transport machines and perform hot press machine loading, etc., the slab multi-layer is twisted and pulled, and the slab thickness symmetry is laid. , easy to cause the finished board to warp and deform due to poor thickness symmetry;
(9) Because the single laminator has a large format, it has a large area, but since the pre-pressing machine and some transporters and plate loading machines are not required, the length of the entire paving is relatively small.
2.1.2 Large-scale single-layer hot press production line new technology application, equipment improvement and production practice application (1) Airflow paving machine · Change the original closed-loop airflow system to the external circulation airflow system, avoiding the inner circulation airflow to the air distribution pipe The blockage improves the reliability of the equipment and reduces the maintenance cost. · Improved the structure of the flat shaving vibrating screen in the paving room and re-determined the optimal position and improved the paving surface quality.
(2) The lifting and lowering of the moving beam of the hot press is controlled by the original pure synchronous cylinder to be synchronously controlled by the synchronous cylinder and the mechanical linkage;
(3) The original thickness detecting device of the hot press is controlled by the original dial contact type to the electronic rotating track encoder, which improves the control precision and can fully realize the automatic control;
(4) All hydraulic system seals adopt new foreign technology to ensure the reliability of the seal;
(5) The pilot valve of all liquid systems adopts new German technology to improve the reliability of use and reduce operating costs;
(6) In order to increase the output, the original auxiliary speed and the pressing feed rate are nearly doubled. Mainly to increase the motor power, and change the original mechanical adjustment to variable frequency speed regulation;
(7) Improve the rotation speed of the longitudinal saw blade, improve the sawing quality of the board, and change the sawing feed speed to variable frequency speed regulation to meet the requirements of different thicknesses;
(8) Improve the structure of the horizontal saw sawing feed plate so that the push plate does not affect the vertical saw sawing when the push plate is retracted, reducing the auxiliary time. Achieve the purpose of increasing production;
(9) The metering of the dried shavings after the improvement adopts the on-line measurement of the microcomputer control, that is, the original volume measurement is changed to the weight measurement;
(10) The glue supply system uses the weight loss method to measure the glue output, and the glue supply amount is accurate;
(11) Cooperating with the School of Mechanical Engineering and Automation of Northeastern University, the drying of shavings uses a three-channel drum dryer;
(12) Swedish firefly infrared temperature control spark detection and fire extinguishing system can be set on the drying pipeline.
2.2 MDF production line a, new non-standard large format (6'×16') pre-installed-----installation-----hot press unit;
b. Technical characteristics of the medium density fiberboard production line of the heavy machinery group.
(1) Large-format forming hot pressing (exporting Russian project), producing 6'×16' large-format finished board, which has wider application;
(2) The process of installing the board machine with pre-installed machine, the equipment structure is simple, the weight is light, and the board is stable and reliable. The auxiliary time is short. Overcome the "bottleneck" phenomenon of multi-lamination machine board, making the annual output stable and reliable, and breaking through 100,000 cubic meters (the original design capacity is 96,000 m3 / a);
(3) New vacuum negative pressure-----mechanical paving;
(4) The hydraulic system is carefully designed and configured to close the pressurization time: ensure that the pressurization process is completed within less than 20 seconds, and the installed power is low. The system adopts the international advanced pump valve system and optimized design of the integrated block and charge. The liquid valve is simple to install, easy to maintain and reliable to use.
(5) The hot grinding machine and sanding unit are equipped with internationally advanced models: the hot mill is the full-opening pressure type of Andritz in Austria;
The sander is Swiss Stenemann2+4 inclined roller type;
The fiber quality and the final surface quality of the product are ensured.
(6) Perfect on-line inspection is to fully automate the quality control of the production line and ensure the execution of process parameters, mainly installing the online density/water content detector;
(7) Carefully design the three-stage dust removal system to ensure the environmental protection requirements of the production line;
(8) The newly designed large-diameter low-mixing ratio low-temperature pipe dryer overcomes the shortcomings of pre-curing of the sizing part due to excessive temperature and ensures the stability of the production line;
(9) All motors and reducers adopt German SEW company products to ensure the stability of the production line;
(10) Designing the use of thermal energy centers, using bark, sanding powder, and waste water as fuel, and treating hot-milled wastewater and hot-pressed waste gas to carry out comprehensive environmental protection;
(11) The whole line electrical control system adopts PLC automatic control;
(12) The sizing quantity system adopts the new “weight loss method†to reduce the amount of measurement, which avoids the glue being adhered to the barrel wall after a long time of use, resulting in inaccurate measurement. (13) Adopt Swedish firefly infrared temperature detection fire extinguishing system to ensure safe and accurate operation.
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