An energy-saving bamboo board hot pressing machine and energy-saving method

Abstract

This invention discloses an energy-saving bamboo board hot pressing molding machine and energy-saving method, including a frame-shaped body, a steam distribution tank, a cold water tank, a water pump, a PLC controller, multiple control valves, a multi-layer hot pressing plate driven by a hydraulic cylinder on the frame-shaped body that can be opened and closed vertically, a temperature sensor A on the multi-layer hot pressing plate, and A combination pipes B, C combination pipes, and D combination pipes on both sides of the multi-layer hot pressing plate for distributing water vapor into and out of each layer of hot pressing plate; it also includes a high-temperature water storage tank, a hot water tank, a temperature sensor B on the hot water tank, a single-suction hot water pump, and a water pumping device, and through the corresponding pipeline connections and reasonable arrangement of the operation process, the production efficiency is higher and the energy consumption is lower.

Description

Technical Field

[0001] This invention belongs to the field of energy-saving technology and relates to an energy-saving bamboo board hot pressing machine and energy-saving method. Background Technology

[0002] The bamboo board hot press forming machine is the main equipment for processing reconstituted bamboo materials. Although the specific structures of existing bamboo board hot press forming machines vary, they generally consist of multiple layers of hot press plates that can be opened and closed vertically, driven by hydraulic cylinders and mounted on a frame; water and steam pipelines; control valves and auxiliary valves on the water and steam pipelines; temperature sensors; a water tank; a steam distribution tank; a water pump; and a PLC controller. Each layer of the hot press plate has a disc-shaped water and steam common channel for heating or cooling. The inlet and outlet of the water and steam common channel on the hot press plate are connected to corresponding combination pipes through corresponding hose assemblies. The combination pipes have a main channel for water and steam inflow and outflow, as well as distribution channels corresponding to each layer of the hot press plate and corresponding pneumatic switches.

[0003] After the bamboo strips are glued and the panels are aligned, they are fed into the joint of the hot press plate. After the multi-layer hot press plate is pressed together, steam is introduced to heat it to the set temperature and it is kept at the set temperature to set the shape. Then, cooling water is introduced to cool it down to the set temperature before it can be discharged.

[0004] The typical structure of existing bamboo board hot pressing machines is as follows: Figure 1 As shown, it includes a frame-like structure, a steam distribution tank 2, a cold water pool 3, a water pump 4, a PLC controller 5, multiple control valves, a multi-layer hot press plate 1 driven by a hydraulic cylinder and capable of opening and closing vertically on the frame-like structure, a temperature sensor W1 on the multi-layer hot press plate 1, and a combination pipe J1, a combination pipe J2, a combination pipe J3, and a combination pipe J4 on both sides of the multi-layer hot press plate 1 for distributing the water vapor in and out of each layer of the hot press plate 1.

[0005] The upper end of combined pipe J1 is equipped with a common water-vapor pipe GA, and the lower end is equipped with a condensate pipe M1; the upper end of combined pipe J4 is equipped with a common water-vapor pipe GB, and the lower end is equipped with a condensate pipe M2; the lower end of combined pipe J2 is equipped with a return water pipe N1, and the lower end of combined pipe J3 is equipped with a return water pipe N2; the upper ends of the common water-vapor pipe GA and the common water-vapor pipe GB are respectively connected to the body of the second connecting pipe G2 through corresponding tee joints; the two ends of the second connecting pipe G2 are respectively equipped with a first check valve Z1 and a second check valve Z2.

[0006] The cold water tank 3 is connected to the outer end of the first check valve Z1 via the water pump 4 and the first connecting pipe G1; a fifth control valve V5 and a corresponding filter valve L are connected in series on the first connecting pipe G1; the steam separator 2 is connected to the outer end of the second check valve Z2 via the third connecting pipe G3; a second control valve V2 and a corresponding filter valve L are connected in series on the third connecting pipe G3; a first control valve V1 and a corresponding shut-off valve K are connected in parallel on the second control valve V2;

[0007] Combination pipe J1 (A) is connected to the inlet of multi-layer hot press plate 1 through flexible hose group g1 (A); combination pipe J2 (B) is connected to the outlet of multi-layer hot press plate 1 through flexible hose group g2 (B); combination pipe J3 (C) is connected to the outlet of multi-layer hot press plate 1 through flexible hose group g3 (C); and combination pipe J4 (D) is connected to the inlet of multi-layer hot press plate 1 through flexible hose group g4 (D). The number of hoses in each hose group corresponds to the number of layers in multi-layer hot press plate 1.

[0008] The outlet end of condensate pipe M1 is connected in parallel with the outlet end of condensate pipe M2 and then connected to the cold water tank 3 through a connecting pipe. A fourth control valve V4 and a corresponding filter valve are connected in series on the connecting pipe. A corresponding steam trap S and a corresponding shut-off valve K are connected in parallel on the fourth control valve V4.

[0009] The outlet end of return water pipe N1 is connected in parallel with the outlet end of return water pipe N2 and then connected to cold water tank 3 through a connecting pipe. A third control valve V3 and a corresponding filter valve L are connected in series on the connecting pipe.

[0010] The workflow of the existing hot press molding machine includes the following steps:

[0011] A. Gate valve K setting: All gate valves K are set to normally closed throughout the entire process.

[0012] B. Steam heating and heat preservation: After the previous batch of shaped plates is discharged, the current batch of plates is loaded. After the hydraulic cylinder drives the multi-layer hot press plate 1 to press, the first control valve V1, the second control valve V2, and the fourth control valve V4 are opened, and the remaining control valves are closed. The steam in the steam distribution tank 2 is used to heat the multi-layer hot press plate 1 and the corresponding pipeline to the temperature required by the process and to keep it warm for the required time. The steam condensate is returned to the cold water tank 3 through the steam trap S.

[0013] C. After cooling, steam heating and heat preservation are completed, the third control valve V3 and the fifth control valve V5 are opened, and the remaining control valves are closed; the water pump 4 cools the cold water in the cold water tank 3 into the multi-layer hot press plate 1 and the corresponding pipeline to the set temperature of temperature sensor W1.

[0014] D. Repeat steps B to C to begin the next batch of production.

[0015] A hot-press forming machine for bamboo boards using this technology can certainly be used, but it has the following drawbacks:

[0016] A. The energy consumption is relatively high. During heating, steam is used to heat the cold water in the pipeline formed in the previous cooling process to the process temperature. During cooling, cold water is used to cool the pipeline in the previous heating process to the process temperature, requiring a large amount of cold water. The return water to the cold water tank 3 will also cause the water temperature in the cold water tank 3 to rise, and it must be cooled down before it can be used later. The hot platen 1 of the hot press forming machine reaches a temperature of about 130 degrees Celsius when heated and kept warm by steam. The corresponding high-temperature hot water is about 85-100 degrees Celsius. If the high-temperature hot water is directly recycled as cold water, and the heated cold water needs to be cooled down before it can be used, the energy consumption is too high. This part of the energy consumption accounts for about 30% of the total energy consumption of the process.

[0017] B. Due to the relatively long time interval required for switching between heating and cooling, the production efficiency is not high enough.

[0018] In conclusion, the performance of existing bamboo board hot pressing machines is not yet ideal. Summary of the Invention

[0019] To overcome the shortcomings of existing technologies, this invention provides an energy-saving bamboo board hot pressing machine and energy-saving method with higher production efficiency and lower energy consumption.

[0020] The technical solution adopted by the present invention to achieve the above-mentioned technical objectives is: an energy-saving bamboo board hot pressing molding machine, including a frame-shaped frame, a steam distribution tank, a cold water pool, a water pump, a PLC controller, multiple control valves, a multi-layer hot pressing plate driven by a hydraulic cylinder on the frame-shaped frame that can be opened and closed vertically, a temperature sensor A on the multi-layer hot pressing plate, and A combined pipe, B combined pipe, C combined pipe and D combined pipe on both sides of the multi-layer hot pressing plate for distributing the water vapor of each layer of hot pressing plate into and out;

[0021] The upper end of pipe A is equipped with a water-vapor common pipe and the lower end with a condensate pipe; the upper end of pipe D is equipped with a water-vapor common pipe and the lower end with a condensate pipe; the lower end of pipe B is equipped with a return water pipe, and the lower end of pipe C is equipped with a return water pipe; the upper ends of pipe A and pipe B are respectively connected to the body of the second connecting pipe through corresponding tee fittings; the two ends of the second connecting pipe are respectively equipped with a first check valve and a second check valve;

[0022] The cold water tank is connected to the outer end of the first check valve via a water pump and a first connecting pipe; a fifth control valve and a corresponding filter valve are connected in series on the first connecting pipe; the steam separator is connected to the outer end of the second check valve via a third connecting pipe; a second control valve and a corresponding filter valve are connected in series on the third connecting pipe; a first control valve and a corresponding shut-off valve are connected in parallel on the second control valve.

[0023] Combination pipe A is connected to inlet A on the multi-layer hot press plate through hose group A; combination pipe B is connected to outlet A on the multi-layer hot press plate through hose group B; combination pipe C is connected to outlet B on the multi-layer hot press plate through hose group C; and combination pipe D is connected to inlet B on the multi-layer hot press plate through hose group D. The number of hoses in each hose group corresponds to the number of layers in the multi-layer hot press plate.

[0024] The outlet end of condensate pipe A is connected in parallel with the outlet end of condensate pipe B and then connected to the cold water tank through a connecting pipe. A fourth control valve and a corresponding filter valve are connected in series on the connecting pipe; a corresponding steam trap and a corresponding shut-off valve are connected in parallel on the fourth control valve.

[0025] The outlet end of return water pipe A is connected in parallel with the outlet end of return water pipe B, and then connected to the cold water tank through a connecting pipe. A third control valve and a corresponding filter valve are connected in series on the connecting pipe.

[0026] It also includes a high-temperature water storage tank, a hot water pool, a temperature sensor B installed on the hot water pool, a single-suction hot water pump, a pumping device, a fourth connecting pipe, a fifth connecting pipe, a sixth connecting pipe, a sixth control valve, a seventh control valve, an eighth control valve, a ninth control valve, a tenth control valve, an eleventh control valve, a twelfth control valve, a thirteenth control valve, a fourteenth control valve, a third check valve, a fourth check valve, a fifth check valve, a sixth check valve, and a seventh check valve;

[0027] The bottom of the high-temperature water storage tank is connected to the middle section of the second connecting pipe through the fifth connecting pipe; the fifth connecting pipe is connected in series with a corresponding shut-off valve, a seventh control valve, a single-suction hot water pump, a filter valve, an eighth control valve, and a third check valve; the middle section of the second connecting pipe is also connected to a fourth connecting pipe, the end of the fourth connecting pipe is open to the air, and the middle section of the fourth connecting pipe is equipped with a sixth control valve.

[0028] The top of the high-temperature water storage tank is equipped with a sixth connecting pipe, and the end of the sixth connecting pipe is connected to two pipelines via a tee connector; one pipeline is connected to the outlet end of the return water pipe A and the outlet end of the return water pipe B, and a fourth check valve, a ninth control valve, and a corresponding filter valve are connected in series on this pipeline; the other pipeline is connected to the cold water pool after being connected in series with a fifth check valve, a tenth control valve, a thirteenth control valve, and a seventh check valve.

[0029] The parallel outlet ends of return water pipes A and B are connected in series with corresponding shut-off valves, eleventh control valve, and sixth check valve via connecting pipes, and then connected to the inlet end of the pumping device.

[0030] The hot water tank is equipped with three pipelines; the first pipeline is connected to the inlet of the pumping device through a filter valve and a twelfth control valve connected in series; the second pipeline is connected to the outlet of the fourth control valve; the third pipeline is connected to the cold water tank through a fourteenth control valve, a corresponding filter valve, and a third control valve connected in series, with a corresponding drain valve and a corresponding shut-off valve connected in parallel on the fourteenth control valve.

[0031] The water pumping device is an air pump type; when pumping water, the inlet of the pumping cylinder is open and the outlet is closed; when discharging water, the inlet of the pumping cylinder is closed and the outlet is open; the push-pull handle of the water pumping device is driven by a corresponding hydraulic cylinder.

[0032] The corresponding input terminals of the PLC controller are respectively connected to the output signals of temperature sensor A and temperature sensor B; the corresponding output terminals of the PLC controller are respectively connected to the input signals of the water pump, single-suction hot water pump, water pumping device, hydraulic cylinder, first control valve, second control valve, third control valve, fourth control valve, fifth control valve, sixth control valve, seventh control valve, eighth control valve, ninth control valve, tenth control valve, eleventh control valve, twelfth control valve, thirteenth control valve, and fourteenth control valve.

[0033] An energy-saving method for an energy-saving bamboo board hot press forming machine, the working process of the hot press forming machine includes the following steps:

[0034] A. The shut-off valve settings: The shut-off valves in the pipeline where the eleventh control valve is located and the shut-off valve connected to the bottom of the high-temperature water storage tank are all set to normally open throughout the entire process, while other shut-off valves are set to normally closed throughout the entire process.

[0035] B. First drying: After the previous batch of shaped boards is discharged, the current batch of boards is loaded. After the hydraulic cylinder drives the multi-layer hot press plate to press tightly, the sixth, eleventh, and thirteenth control valves are opened, and the remaining control valves are closed. The water pumping device is activated to pump the residual cold water in the multi-layer hot press plate and the corresponding pipeline to the cold water tank.

[0036] C. Preheating: After the first drying is completed, the seventh, eighth, and ninth control valves are opened, and the remaining control valves are closed; the single-suction hot water pump is activated, and the hot water in the high-temperature storage tank is used to preheat the multi-layer hot press plate and corresponding pipelines. After the temperature of temperature sensor A reaches the corresponding temperature set in the process, the preheating is completed.

[0037] D. After the second pumping and preheating, the sixth, eleventh, and thirteenth control valves are opened, and the remaining control valves are closed. The pumping device is activated to pump the residual water in the multi-layer hot press plate and the corresponding pipeline that has not reached the high temperature value set by temperature sensor B to the cold water tank.

[0038] E. Steam heating and heat preservation: After the second drying is completed, the first control valve, the second control valve, the tenth control valve, and the eleventh control valve are opened, and the remaining control valves are closed. The steam in the steam distribution tank is used to heat the multi-layer hot press plate and the corresponding pipeline to the temperature required by the process and to keep it warm for the required duration. The water pumping device is activated to send the high-temperature hot water condensed in the multi-layer hot press plate to the high-temperature water storage tank to maintain the temperature of the hot water in the tank at a high temperature. When the temperature sensor A reaches the corresponding temperature set by the process and the heat preservation time is sufficient, the steam heating and heat preservation are completed.

[0039] F. After the high-temperature water recovery, steam heating, and insulation are completed, when the temperature value of temperature sensor B is higher than the high-temperature water temperature value defined by the process, the fourth, sixth, tenth, eleventh, and twelfth control valves open, and the remaining control valves close; the pumping device operates to recover the high-temperature water from the hot water tank, the multi-layer hot press plate, and the corresponding pipelines to the high-temperature water storage tank; when the temperature value of temperature sensor B is lower than the high-temperature water temperature value defined by the process, the fourth, sixth, eleventh, twelfth, and thirteenth control valves open, and the remaining control valves close; the pumping device operates to recover the medium-temperature water from the hot water tank, the multi-layer hot press plate, and the corresponding pipelines to the cold water tank;

[0040] G. After cooling and high-temperature water recovery are completed, the third and fifth control valves are opened, and the remaining control valves are closed. The water pump uses cold water from the cold water tank to cool the multi-layer hot press plate and corresponding pipelines until the temperature value of temperature sensor A reaches the corresponding temperature set by the process before discharging.

[0041] H. Repeat steps B to G to begin the next batch of production.

[0042] The beneficial effects of this invention are:

[0043] Thanks to the adoption of the above technical solutions, and the installation of a high-temperature water storage tank 6, a single-suction hot water pump 7, a water pumping device 8, and matching valves and fittings, and through the rational arrangement of the process, high-temperature water at 85-100 degrees Celsius is fully recovered. By preheating the high-temperature water and pumping it dry twice, steam is saved, energy is saved by about 30%, production efficiency is higher, energy consumption is lower, and the effect is more ideal. Attached Figure Description

[0044] The present invention will be further described below with reference to the accompanying drawings and embodiments. Wherein:

[0045] Figure 1 This is a schematic diagram of existing technology;

[0046] Figure 2 This is a schematic diagram of the present invention.

[0047] The markings and numbers in the attached diagram are explained as follows: 1. Hot press plate; 2. Steam separator; 3. Cold water tank; 4. Water pump; 5. PLC controller; 6. High-temperature water storage tank; 7. Single-suction hot water pump; 8. Pumping device; 9. Hot water tank; 1. Combined pipe A (J1); 2. Combined pipe B (J2); 3. Combined pipe C (J3); 4. Combined pipe D (J4); 1. First control valve V1; 2. Second control valve V2; 3. Third control valve V3; 4. Fourth control valve V4; 5. Fifth control valve V5; 6. Sixth control valve V6; 7. Seventh control valve V7; 8. Eighth control valve V8; 9. Ninth control valve V9; 10. Tenth control valve V10; 11. Eleventh control valve V11; 12. Twelfth control valve V12; 13. Thirteenth control valve V13; 14. Fourteenth control valve V14. 4. First check valve Z1, Second check valve Z2, Third check valve Z3, Fourth check valve Z4, Fifth check valve Z5, Sixth check valve Z6, Seventh check valve Z7, First connecting pipe G1, Second connecting pipe G2, Third connecting pipe G3, Fourth connecting pipe G4, Fifth connecting pipe G5, Sixth connecting pipe G6, A water-vapor common pipe GA, B water-vapor common pipe GB, A condensate pipe M1, B condensate pipe M2, A return water pipe N1, B return water pipe N2, A hose group g1, B hose group g2, C hose group g3, D hose group g4, A temperature sensor W1, B temperature sensor W2, Filter valve L, Steam trap S, Shut-off valve K Detailed Implementation

[0048] Embodiments of the present invention, such as Figure 2 As shown, an energy-saving bamboo board hot pressing molding machine includes a frame-shaped frame, a steam distribution tank 2, a cold water tank 3, a water pump 4, a PLC controller 5, multiple control valves, a multi-layer hot pressing plate 1 driven by a hydraulic cylinder and capable of opening and closing vertically on the frame-shaped frame, a temperature sensor W1 on the multi-layer hot pressing plate 1, and a combination pipe J1, a combination pipe J2, a combination pipe J3, and a combination pipe J4 on both sides of the multi-layer hot pressing plate 1 for distributing water vapor into and out of each layer of the hot pressing plate 1.

[0049] The upper end of combined pipe J1 is equipped with a common water-vapor pipe GA, and the lower end is equipped with a condensate pipe M1; the upper end of combined pipe J4 is equipped with a common water-vapor pipe GB, and the lower end is equipped with a condensate pipe M2; the lower end of combined pipe J2 is equipped with a return water pipe N1, and the lower end of combined pipe J3 is equipped with a return water pipe N2; the upper ends of the common water-vapor pipe GA and the common water-vapor pipe GB are respectively connected to the body of the second connecting pipe G2 through corresponding tee joints; the two ends of the second connecting pipe G2 are respectively equipped with a first check valve Z1 and a second check valve Z2.

[0050] The cold water tank 3 is connected to the outer end of the first check valve Z1 via the water pump 4 and the first connecting pipe G1; a fifth control valve V5 and a corresponding filter valve L are connected in series on the first connecting pipe G1; the steam separator 2 is connected to the outer end of the second check valve Z2 via the third connecting pipe G3; a second control valve V2 and a corresponding filter valve L are connected in series on the third connecting pipe G3; a first control valve V1 and a corresponding shut-off valve K are connected in parallel on the second control valve V2;

[0051] Combination pipe J1 (A) is connected to inlet A on multi-layer hot press plate 1 via hose group g1 (A); combination pipe J2 (B) is connected to outlet A on multi-layer hot press plate 1 via hose group g2 (B); combination pipe J3 (C) is connected to outlet B on multi-layer hot press plate 1 via hose group g3 (C); and combination pipe J4 (D) is connected to inlet B on multi-layer hot press plate 1 via hose group g4 (D). The number of hoses in each hose group corresponds to the number of layers in multi-layer hot press plate 1.

[0052] The outlet end of condensate pipe M1 is connected in parallel with the outlet end of condensate pipe M2 and then connected to the cold water tank 3 through a connecting pipe. A fourth control valve V4 and a corresponding filter valve are connected in series on the connecting pipe. A corresponding steam trap S and a corresponding shut-off valve K are connected in parallel on the fourth control valve V4.

[0053] The outlet end of return water pipe N1 is connected in parallel with the outlet end of return water pipe N2 and then connected to cold water tank 3 through a connecting pipe. A third control valve V3 and a corresponding filter valve L are connected in series on the connecting pipe.

[0054] It also includes a high-temperature water storage tank 6, a hot water pool 9, a temperature sensor W2 installed on the hot water pool 9, a single-suction hot water pump 7, a water pumping device 8, a fourth connecting pipe G4, a fifth connecting pipe G5, a sixth connecting pipe G6, a sixth control valve V6, a seventh control valve V7, an eighth control valve V8, a ninth control valve V9, a tenth control valve V10, an eleventh control valve V11, a twelfth control valve V12, a thirteenth control valve V13, a fourteenth control valve V14, a third check valve Z3, a fourth check valve Z4, a fifth check valve Z5, a sixth check valve Z6, and a seventh check valve Z7;

[0055] The bottom of the high-temperature water storage tank 6 is connected to the middle section of the second connecting pipe G2 via the fifth connecting pipe G5; the fifth connecting pipe G5 is sequentially connected with a corresponding shut-off valve K, a seventh control valve V7, a single-suction hot water pump 7, a filter valve L, an eighth control valve V8, and a third check valve Z3; the middle section of the second connecting pipe G2 is also connected to a fourth connecting pipe G4, the end of the fourth connecting pipe G4 is open to the air, and the middle section of the fourth connecting pipe G4 is equipped with a sixth control valve V6;

[0056] The top of the high-temperature water storage tank 6 is equipped with a sixth connecting pipe G6. The end of the sixth connecting pipe G6 is connected to two pipes via a tee connector. One pipe is connected to the outlet of the return water pipe N1 and the outlet of the return water pipe N2. The fourth check valve Z4, the ninth control valve V9, and the corresponding filter valve L are connected in series on this pipe. The other pipe is connected to the cold water pool 3 after being connected in series with the fifth check valve Z5, the tenth control valve V10, the thirteenth control valve V13, and the seventh check valve Z7.

[0057] The parallel outlet ends of return water pipe N1 and return water pipe N2 are connected in series with corresponding shut-off valve K, eleventh control valve V11, and sixth check valve Z6 through connecting pipes, and then connected to the inlet end of pumping device 8.

[0058] The hot water tank 9 is equipped with three pipelines; the first pipeline is connected to the inlet of the pumping device 8 through the filter valve L and the twelfth control valve V12 connected in series; the second pipeline is connected to the outlet of the fourth control valve V4; the third pipeline is connected to the cold water tank 3 through the fourteenth control valve V14, the corresponding filter valve L, and the third control valve V3 connected in series. The fourteenth control valve V14 is equipped with a corresponding drain valve S and a corresponding shut-off valve K connected in parallel.

[0059] The water pumping device 8 is an air pump type water pumping device 8; when pumping water, the water inlet of the water pumping cylinder is open and the water outlet is closed; when discharging water, the water inlet of the water pumping cylinder is closed and the water outlet is open; the push-pull handle of the water pumping device 8 is driven by a corresponding hydraulic cylinder.

[0060] The corresponding input terminals of the PLC controller 5 are respectively connected to the output terminals of temperature sensor W1 and temperature sensor W2; the corresponding output terminals of the PLC controller 5 are respectively connected to the input terminals of water pump 4, single-suction hot water pump 7, water pumping device 8, hydraulic cylinder, first control valve V1, second control valve V2, third control valve V3, fourth control valve V4, fifth control valve V5, sixth control valve V6, seventh control valve V7, eighth control valve V8, ninth control valve V9, tenth control valve V10, eleventh control valve V11, twelfth control valve V12, thirteenth control valve V13, and fourteenth control valve V14.

[0061] An energy-saving method for an energy-saving bamboo board hot press forming machine, the working process of the hot press forming machine includes the following steps:

[0062] A. The setting of the shut-off valve K: The shut-off valve K in the pipeline where the eleventh control valve V11 is located and the shut-off valve K connected to the bottom of the high-temperature water storage tank 6 are set to normally open throughout the entire process, while other shut-off valves K are set to normally closed throughout the entire process.

[0063] B. First drying: After the previous batch of shaped boards is discharged, the current batch of boards is loaded. After the hydraulic cylinder drives the multi-layer hot press plate 1 to press, the sixth control valve V6, the eleventh control valve V11, and the thirteenth control valve V13 are opened, and the remaining control valves are closed. The water pumping device 8 is activated to pump the residual cold water in the multi-layer hot press plate 1 and the corresponding pipeline to the cold water tank 3.

[0064] C. Preheating: After the first drying is completed, the seventh control valve V7, the eighth control valve V8, and the ninth control valve V9 are opened, and the remaining control valves are closed. The single-suction hot water pump 7 is activated to preheat the multi-layer hot press plate 1 and the corresponding pipeline with hot water in the high-temperature water storage tank 6. After the temperature of temperature sensor W1 reaches the corresponding temperature set in the process, the preheating is completed.

[0065] D. After the second pumping and preheating, the sixth control valve V6, the eleventh control valve V11, and the thirteenth control valve V13 are opened, and the remaining control valves are closed; the pumping device 8 is activated to pump the residual water in the multi-layer hot press plate 1 and the corresponding pipeline that has not reached the high temperature value set by temperature sensor W2 to the cold water tank 3.

[0066] E. Steam heating and heat preservation: After the second drying is completed, the first control valve V1, the second control valve V2, the tenth control valve V10, and the eleventh control valve V11 are opened, and the remaining control valves are closed. The steam in the steam distribution tank 2 is used to heat the multi-layer hot press plate 1 and the corresponding pipeline to the temperature required by the process and to keep it warm for the required time. The water pumping device 8 is activated to send the high-temperature hot water condensed in the multi-layer hot press plate 1 to the high-temperature water storage tank 6 to maintain the temperature of the hot water in the tank at a high temperature. When the temperature sensor W1 reaches the corresponding temperature set by the process and the heat preservation time is sufficient, the steam heating and heat preservation are completed.

[0067] F. After the high and medium temperature water recovery, steam heating, and heat preservation are completed, when the temperature value of temperature sensor W2 is higher than the high temperature water temperature value defined by the process, the fourth control valve V4, the sixth control valve V6, the tenth control valve V10, the eleventh control valve V11, and the twelfth control valve V12 are opened, and the remaining control valves are closed; the pumping device 8 is activated to recover the high temperature water in the hot water tank 9, the multi-layer hot press plate 1, and the corresponding pipelines to the high temperature water storage tank 6; when the temperature value of temperature sensor W2 is lower than the high temperature water temperature value defined by the process, the fourth control valve V4, the sixth control valve V6, the eleventh control valve V11, the twelfth control valve V12, and the thirteenth control valve V13 are opened, and the remaining control valves are closed; the pumping device 8 is activated to recover the medium temperature water in the hot water tank 9, the multi-layer hot press plate 1, and the corresponding pipelines to the cold water tank 3;

[0068] G. After cooling and high-temperature water recovery are completed, the third control valve V3 and the fifth control valve V5 are opened, and the remaining control valves are closed. The water pump 4 uses the cold water from the cold water tank 3 to cool the multi-layer hot press plate 1 and the corresponding pipeline until the temperature value of temperature sensor W1 reaches the corresponding temperature set by the process, and then the material is discharged.

[0069] H. Repeat steps B to G to begin the next batch of production.

[0070] Further explanation of the present invention: Obviously, the technology of the present invention is not limited to the bamboo board as described in the patent title, but can also be widely applied to the production of various bamboo and wood engineered boards such as bamboo-wood composite container flooring, reconstituted bamboo board, OSB wood shavings and bamboo radial strip composite board.

Claims

1. An energy-saving bamboo board hot pressing molding machine, comprising a frame-shaped frame, a steam distribution tank, a cold water tank, a water pump, a PLC controller, multiple control valves, a multi-layer hot pressing plate driven by a hydraulic cylinder and capable of opening and closing vertically on the frame-shaped frame, a temperature sensor A on the multi-layer hot pressing plate, and A combined pipe, B combined pipe, C combined pipe and D combined pipe on both sides of the multi-layer hot pressing plate for distributing the water vapor in and out of each layer of hot pressing plate; The upper end of pipe A is equipped with a water-vapor common pipe and the lower end with a condensate pipe; the upper end of pipe D is equipped with a water-vapor common pipe and the lower end with a condensate pipe; the lower end of pipe B is equipped with a return water pipe, and the lower end of pipe C is equipped with a return water pipe; the upper ends of pipe A and pipe B are respectively connected to the body of the second connecting pipe through corresponding tee fittings; the two ends of the second connecting pipe are respectively equipped with a first check valve and a second check valve; The cold water tank is connected to the outer end of the first check valve via a water pump and a first connecting pipe; a fifth control valve and a corresponding filter valve are connected in series on the first connecting pipe; the steam separator is connected to the outer end of the second check valve via a third connecting pipe; a second control valve and a corresponding filter valve are connected in series on the third connecting pipe; a first control valve and a corresponding shut-off valve are connected in parallel on the second control valve. Combination pipe A is connected to inlet A on the multi-layer hot press plate through hose group A; combination pipe B is connected to outlet A on the multi-layer hot press plate through hose group B; combination pipe C is connected to outlet B on the multi-layer hot press plate through hose group C; and combination pipe D is connected to inlet B on the multi-layer hot press plate through hose group D. The number of hoses in each hose group corresponds to the number of layers in the multi-layer hot press plate. The outlet end of condensate pipe A is connected in parallel with the outlet end of condensate pipe B and then connected to the cold water tank through a connecting pipe. A fourth control valve and a corresponding filter valve are connected in series on the connecting pipe; a corresponding steam trap and a corresponding shut-off valve are connected in parallel on the fourth control valve. The outlet end of return water pipe A is connected in parallel with the outlet end of return water pipe B, and then connected to the cold water tank through a connecting pipe. A third control valve and a corresponding filter valve are connected in series on the connecting pipe. Its features are: It also includes a high-temperature water storage tank, a hot water pool, a temperature sensor B installed on the hot water pool, a single-suction hot water pump, a pumping device, a fourth connecting pipe, a fifth connecting pipe, a sixth connecting pipe, a sixth control valve, a seventh control valve, an eighth control valve, a ninth control valve, a tenth control valve, an eleventh control valve, a twelfth control valve, a thirteenth control valve, a fourteenth control valve, a third check valve, a fourth check valve, a fifth check valve, a sixth check valve, and a seventh check valve; The bottom of the high-temperature water storage tank is connected to the middle section of the second connecting pipe through the fifth connecting pipe; the fifth connecting pipe is connected in series with a corresponding shut-off valve, a seventh control valve, a single-suction hot water pump, a filter valve, an eighth control valve, and a third check valve; the middle section of the second connecting pipe is also connected to a fourth connecting pipe, the end of the fourth connecting pipe is open to the air, and the middle section of the fourth connecting pipe is equipped with a sixth control valve. The top of the high-temperature water storage tank is equipped with a sixth connecting pipe, and the end of the sixth connecting pipe is connected to two pipelines via a tee connector; one pipeline is connected to the outlet end of the return water pipe A and the outlet end of the return water pipe B, and a fourth check valve, a ninth control valve, and a corresponding filter valve are connected in series on this pipeline; the other pipeline is connected to the cold water pool after being connected in series with a fifth check valve, a tenth control valve, a thirteenth control valve, and a seventh check valve. The parallel outlet ends of return water pipes A and B are connected in series with corresponding shut-off valves, eleventh control valve, and sixth check valve via connecting pipes, and then connected to the inlet end of the pumping device. The hot water tank is equipped with three pipelines; the first pipeline is connected to the inlet of the pumping device through a filter valve and a twelfth control valve connected in series; the second pipeline is connected to the outlet of the fourth control valve; the third pipeline is connected to the cold water tank through a fourteenth control valve, a corresponding filter valve, and a third control valve connected in series, with a corresponding drain valve and a corresponding shut-off valve connected in parallel on the fourteenth control valve.

2. The energy-saving bamboo board hot pressing machine according to claim 1, characterized in that: The water pumping device is an air pump type; when pumping water, the inlet of the pumping cylinder is open and the outlet is closed; when discharging water, the inlet of the pumping cylinder is closed and the outlet is open; the push-pull handle of the water pumping device is driven by a corresponding hydraulic cylinder.

3. The energy-saving bamboo board hot pressing machine according to claim 2, characterized in that: The corresponding input terminals of the PLC controller are respectively connected to the output signals of temperature sensor A and temperature sensor B; the corresponding output terminals of the PLC controller are respectively connected to the input signals of the water pump, single-suction hot water pump, water pumping device, hydraulic cylinder, first control valve, second control valve, third control valve, fourth control valve, fifth control valve, sixth control valve, seventh control valve, eighth control valve, ninth control valve, tenth control valve, eleventh control valve, twelfth control valve, thirteenth control valve, and fourteenth control valve.

4. An energy-saving method for an energy-saving bamboo board hot pressing machine, characterized in that: Working process of hot press molding machine Includes the following steps: A. The shut-off valve settings: The shut-off valves in the pipeline where the eleventh control valve is located and the shut-off valve connected to the bottom of the high-temperature water storage tank are all set to normally open throughout the entire process, while other shut-off valves are set to normally closed throughout the entire process. B. First drying: After the previous batch of shaped boards is discharged, the current batch of boards is loaded. After the hydraulic cylinder drives the multi-layer hot press plate to press tightly, the sixth, eleventh, and thirteenth control valves are opened, and the remaining control valves are closed. The water pumping device is activated to pump the residual cold water in the multi-layer hot press plate and the corresponding pipeline to the cold water tank. C. Preheating: After the first drying is completed, the seventh, eighth, and ninth control valves are opened, and the remaining control valves are closed; the single-suction hot water pump is activated, and the hot water in the high-temperature storage tank is used to preheat the multi-layer hot press plate and corresponding pipelines. After the temperature of temperature sensor A reaches the corresponding temperature set in the process, the preheating is completed. D. After the second pumping and preheating, the sixth, eleventh, and thirteenth control valves are opened, and the remaining control valves are closed. The pumping device is activated to pump the residual water in the multi-layer hot press plate and the corresponding pipeline that has not reached the high temperature value set by temperature sensor B to the cold water tank. E. Steam heating and heat preservation: After the second drying is completed, the first control valve, the second control valve, the tenth control valve, and the eleventh control valve are opened, and the remaining control valves are closed. The steam in the steam distribution tank is used to heat the multi-layer hot press plate and the corresponding pipeline to the temperature required by the process and to keep it warm for the required duration. The water pumping device is activated to send the high-temperature hot water condensed in the multi-layer hot press plate to the high-temperature water storage tank to maintain the temperature of the hot water in the tank at a high temperature. When the temperature sensor A reaches the corresponding temperature set by the process and the heat preservation time is sufficient, the steam heating and heat preservation are completed. F. After the high-temperature water recovery, steam heating, and insulation are completed, when the temperature value of temperature sensor B is higher than the high-temperature water temperature value defined by the process, the fourth, sixth, tenth, eleventh, and twelfth control valves open, and the remaining control valves close; the pumping device operates to recover the high-temperature water from the hot water tank, the multi-layer hot press plate, and the corresponding pipelines to the high-temperature water storage tank; when the temperature value of temperature sensor B is lower than the high-temperature water temperature value defined by the process, the fourth, sixth, eleventh, twelfth, and thirteenth control valves open, and the remaining control valves close; the pumping device operates to recover the medium-temperature water from the hot water tank, the multi-layer hot press plate, and the corresponding pipelines to the cold water tank; G. After cooling and high-temperature water recovery are completed, the third and fifth control valves are opened, and the remaining control valves are closed. The water pump uses cold water from the cold water tank to cool the multi-layer hot press plate and corresponding pipelines until the temperature value of temperature sensor A reaches the corresponding temperature set by the process before discharging. H. Repeat steps B to G to begin the next batch of production.

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