CN111015890A - Straw board hot press system - Google Patents
Straw board hot press system Download PDFInfo
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- CN111015890A CN111015890A CN201911359973.3A CN201911359973A CN111015890A CN 111015890 A CN111015890 A CN 111015890A CN 201911359973 A CN201911359973 A CN 201911359973A CN 111015890 A CN111015890 A CN 111015890A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
- B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
- B27N3/08—Moulding or pressing
- B27N3/20—Moulding or pressing characterised by using platen-presses
- B27N3/203—Moulding or pressing characterised by using platen-presses with heating or cooling means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
- B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
- B27N3/04—Manufacture of substantially flat articles, e.g. boards, from particles or fibres from fibres
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
- B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
- B27N3/08—Moulding or pressing
- B27N3/18—Auxiliary operations, e.g. preheating, humidifying, cutting-off
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D11/00—Feed-water supply not provided for in other main groups
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D11/00—Feed-water supply not provided for in other main groups
- F22D11/02—Arrangements of feed-water pumps
- F22D11/06—Arrangements of feed-water pumps for returning condensate to boiler
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- Life Sciences & Earth Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Water Supply & Treatment (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Veneer Processing And Manufacture Of Plywood (AREA)
Abstract
The invention relates to a straw board hot press system, which comprises a straw board hot press, a steam heating device, a cold water cooling device and a control device, wherein two channels are arranged in a hot press plate, one channel is used for steam, and the other channel is used for cold water. Through controlling means, the steam flow that steam among the control steam heating device entered into every layer of hot pressboard makes and gets into the steam flow on the both sides layer of multilayer hot pressboard is greater than the steam flow in intermediate level to realize rapid heating up and the process of heat preservation pressurize, the inhomogeneous phenomenon of temperature when this system has overcome hot pressing multilayer straw panel, when guaranteeing multilayer panel hot pressing, each layer temperature is even unanimous, prevents to explode the production of defects such as board, deformation, guarantees the quality of panel. Meanwhile, the control device also controls the on-off of the cold water cooling device, so that the temperature of the plate is quickly reduced, the quality of the plate is guaranteed, and the production efficiency of the hot-pressed plate is greatly improved.
Description
Technical Field
The invention relates to the technical field of hot pressing, in particular to a straw plate hot press system.
Background
The production of the board consumes a large amount of wood every year, and the production of the board by using the straw to replace the wood board becomes a technology which is rapidly developed in recent years in order to reduce the pressure of forest resources. At present, when straw boards are produced in China, an inorganic cementing material is mainly used as an adhesive, and the method has the advantages of low cost and no pollution. In order to improve the processing efficiency of the straw board, a production process of pressurizing and heating-pressure maintaining-cooling-pressure relief is adopted, but the production process is different from the process of solidifying and forming the wood board only with short hot pressing time, the straw board needs to maintain pressure at the high temperature of 160 plus 220 ℃, the solidifying speed of the cementing material is accelerated, but the pressure maintaining time is still several times longer than that of the wood board, so that the stability of the temperature of each layer of hot-pressed board in a long time is ensured, and the key of the forming quality of the straw board is realized. In the hot press with the multiple layers of hot pressing plates, because the positions are different and the influence of heat transfer is avoided, the temperatures of the hot pressing plates at different positions are different, so that the plates are heated unevenly, the defects of plate explosion, deformation and the like are further caused, and the yield of the straw plates is reduced. In addition, the pressure can be released only by cooling to a certain temperature, for example, below 90 ℃ under the pressure, so that the defects of plate explosion, deformation and the like existing in the process of pressure reduction at high temperature are overcome.
In addition, the longer pressure maintaining time enables the forming efficiency of the straw board to be lower, and the cooling time of the straw board is accelerated as much as possible, which is the key for improving the production efficiency of the straw board. If adopt the mode of conduction oil heating, there is the slow problem of cooling, has prolonged the time of panel in the hot press greatly, leads to inefficiency, compares with traditional wooden board processing, does not have the advantage.
Disclosure of Invention
The invention mainly aims to provide a hot pressing system according to a high-temperature pressurizing production process of straw plates, solve the problems of plate explosion, deformation and the like caused by inconsistent temperatures of the plates at different positions, ensure the quality of the plates, and simultaneously reduce the temperature at a higher speed and improve the production efficiency of the plates.
The purpose of the invention and the technical problem to be solved are realized by adopting the following technical scheme. The straw plate hot press system comprises a straw plate hot press, wherein the straw plate hot press comprises a rack and a plurality of layers of hot press plates arranged on the rack; each layer of hot pressing plate is respectively provided with a steam pipeline and a cold water pipeline;
the straw panel hot press system further comprises:
the steam heating device is respectively connected with the inlet of the steam pipeline of each layer of hot pressing plate, and provides required steam for the straw board hot press so that each layer of hot pressing plate is heated to the required temperature;
the cold water cooling device is respectively connected with the inlet of the cold water pipeline of each layer of hot pressing plate and used for providing required cold water for the straw board hot press so as to reduce the temperature of each layer of hot pressing plate to the required temperature;
and the control device comprises a steam controller, the steam controller is connected with the steam pipeline and is used for controlling the steam flow of the steam in the steam heating device entering each layer of hot pressing plate, so that the steam flow entering the two side layers of the multilayer hot pressing plates is larger than the steam flow in the middle layer.
The object of the present invention and the technical problems solved thereby can be further achieved by the following technical measures.
Preferably, in the straw board hot press system, the steam flow entering the middle layer hot press plate is 70-100% of the steam flow entering the two side layer hot press plates.
Preferably, in the straw board hot press system, the steam flow entering the middle layer hot press plate is 80-90% of the steam flow entering the two side layer hot press plates.
Preferably, in the straw board hot press system, the steam flow entering the middle layer hot press plate is 85% of the steam flow entering the two side layer hot press plates.
Preferably, the straw board hot press system further comprises:
the circulating recovery device is respectively connected with the outlet of the steam pipeline of each layer of hot pressing plate and the outlet of the cold water pipeline and is used for recovering steam condensate water in the steam pipeline and cold water after heat exchange in the cold water pipeline; the circulation recovery device is also connected with the steam heating device and provides a water source for the steam heating device.
Preferably, the straw board hot press system further comprises a temperature detection element arranged on the plurality of layers of hot press boards and used for detecting the temperature of each layer of hot press boards.
Preferably, in the straw board hot press system, a steam flow control valve is respectively arranged at an inlet of a steam pipeline of each layer of hot press board, the steam flow control valve is connected with the steam controller, and the steam controller adjusts the steam flow control valve by receiving temperature feedback of the temperature detection element so as to adjust the steam flow of the steam entering the steam pipeline of each layer of hot press board.
Preferably, in the straw board hot press system, a flow meter is respectively arranged at an inlet of the steam pipeline of each layer of hot press board to measure the steam flow entering each layer of hot press board.
Preferably, in the straw board hot press system, the cold water cooling device is provided with a cold water control valve, and the cold water control valve is arranged in front of an inlet of a cold water pipeline of each layer of hot press board;
the control device further comprises a cold water controller, and the cold water controller is connected with the cold water control valve and controls the on-off of the cold water control valve.
Preferably, in the straw board hot press system, the steam pipeline and the cold water pipeline are arranged in parallel on each layer of hot press board, and the steam flow direction in the steam pipeline is opposite to the cold water flow direction in the cold water pipeline.
By means of the technical scheme, the straw plate hot press system provided by the invention at least has the following advantages:
1. the system of the straw board hot press comprises the straw board hot press, a steam heating device, a cold water cooling device and a control device, wherein two channels are arranged in a hot press plate, one channel is used for steam, and the other channel is used for cold water. Through controlling means, the steam flow that steam among the control steam heating device entered into every layer of hot pressboard makes and gets into the steam flow on the both sides layer of multilayer hot pressboard is greater than the steam flow in intermediate level to realize rapid heating up and the process of heat preservation pressurize, the inhomogeneous phenomenon of temperature when this system has overcome hot pressing multilayer straw panel, when guaranteeing multilayer panel hot pressing, each layer temperature is even unanimous, prevents to explode the production of defects such as board, deformation, guarantees the quality of panel. Meanwhile, the control device also controls the on-off of the cold water cooling device, so that the aims of quickly reducing the temperature of the plate and improving the pressing efficiency of the plate are fulfilled.
2. The system of the invention aims at the production characteristics of the straw board, controls the steam flow of the steam in the steam heating device entering each layer of hot pressing plate through the controller, achieves the purpose of distributing the steam according to the requirement, so as to ensure the temperature balance of the straw board in the long-time high-temperature pressure maintaining process, cuts off the steam supplied to the hot pressing plate after the pressure maintaining process of the straw board is finished, and leads cold water through the cold water cooling device and the cold water pipeline arranged in each layer of hot pressing plate, and the cold water is pumped in by the water pump to rapidly cool, thereby overcoming the problem of slow cooling speed of the hot pressing plate, obviously shortening the retention time of the straw board in the hot press, and greatly improving the production efficiency of the hot pressing straw board while ensuring the quality of the straw board.
3. The circulating hot water formed by cooling the cold water cooling device and the high-temperature steam condensate water formed by the steam heating device are recovered through the circulating recovery device, and the warm water in the circulating recovery device can be supplied to the steam heating device. The energy utilization efficiency is improved by recycling the circulating hot water and the steam condensate water in the hot pressing plate.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.
Drawings
FIG. 1 is a schematic view of a straw board hot press system according to one embodiment of the present invention;
fig. 2 is a schematic diagram illustrating the arrangement of steam pipes and cold water pipes on each hot pressing plate in the straw board hot press system according to an embodiment of the present invention.
Detailed Description
To further illustrate the technical means and effects of the present invention, the following detailed description will be given to the specific embodiments, structures, features and effects of the straw board hot press system according to the present invention with reference to the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "an embodiment" refers to not necessarily the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
As shown in fig. 1, a straw board hot press system according to an embodiment of the present invention includes a straw board hot press 1, where the straw board hot press includes a frame 11 and a plurality of layers of hot press boards 12 disposed on the frame; each layer of hot pressing plate is respectively provided with a steam pipeline and a cold water pipeline, as shown in figure 2;
the straw panel hot press system further comprises:
the steam heating device 3 is respectively connected with the inlet of the steam pipeline of each layer of hot pressing plate, and provides required steam for the straw board hot press 1 to ensure that each layer of hot pressing plate is heated to the required temperature;
the cold water cooling device 4 is respectively connected with the inlet of the cold water pipeline of each layer of hot pressing plate and is used for providing required cold water for the straw board hot press 1 so as to reduce the temperature of each layer of hot pressing plate to the required temperature;
the control device 2 comprises a steam controller 22, wherein the steam controller 22 is connected with the steam pipeline and used for controlling the steam flow of the steam in the steam heating device 3 entering each layer of hot-pressing plate, so that the steam flow entering the hot-pressing plates on the two side layers of the multilayer hot-pressing plate 12 is larger than the steam flow of the hot-pressing plate in the middle layer.
The present embodiment does not specifically limit the structure of the straw board, and the straw board hot press described herein is a modification of a conventional straw board hot press. Specifically, the straw board hot press comprises an upper base and a lower base, wherein hydraulic cylinders are respectively mounted on the upper base and the lower base, and piston rods of the hydraulic cylinders respectively prop against the hot pressing plate; the hot pressing device is characterized in that a plurality of layers of hot pressing plates are arranged between the upper pressing plate and the lower pressing plate, and the plurality of layers of hot pressing plates are vertically stacked and are mutually parallel.
The hot press plates in contact with the upper and lower press plates are hot press plates on both sides, and the hot press plate sandwiched between the hot press plates on both sides is a hot press plate in the middle.
As shown in fig. 2, each layer of hot press plate is respectively provided with a steam inlet, a steam outlet, a cold water inlet and a cold water outlet; the steam inlet, the steam outlet, the cold water inlet and the cold water outlet of the multilayer hot-pressing plate are respectively connected with the steam input pipeline 31, the steam output pipeline 32, the cold water input pipeline 41 and the cold water output pipeline 42. As shown in fig. 1 and 2, a pipe before a steam inlet of the steam pipe is a steam input pipe 31, a pipe after a steam outlet of the steam pipe is a steam output pipe 32, a pipe before a cold water inlet of the cold water pipe is a cold water input pipe 41, and a pipe after a cold water outlet of the cold water pipe is a cold water output pipe 42.
The system of the invention aims at the production characteristics of the straw board, controls the steam flow of the steam in the steam heating device entering each layer of hot pressing plate through the controller, achieves the purpose of distributing the steam according to the requirement, so as to ensure the temperature balance of the straw board in the long-time high-temperature pressure maintaining process, cuts off the steam supplied to the hot pressing plate after the pressure maintaining process of the straw board is finished, and leads cold water through the cold water cooling device and the cold water pipeline arranged in each layer of hot pressing plate, and the cold water is pumped in by the water pump to rapidly cool, thereby overcoming the problem of slow cooling speed of the hot pressing plate, obviously shortening the retention time of the straw board in the hot press, and greatly improving the production efficiency of the hot pressing straw board while ensuring the quality of the straw board.
In a preferred embodiment, the steam flow rate entering the middle layer hot press plate is 70-100% of the steam flow rate entering the two side layer hot press plates.
In the straw board hot press with the multiple layers of hot pressing boards, because the positions are different and the influence of heat transfer is influenced, the middle hot pressing board has the characteristics of quick temperature rise and slow temperature reduction, and the hot pressing boards on the edges have the characteristics of slow temperature rise and fast temperature reduction due to quick heat dissipation, so that the temperature of boards at different positions is unbalanced, the defects of board explosion, deformation and the like are caused, and the yield of the straw boards is reduced.
In order to heat the plates uniformly in the hot press plates, more heat sources are required to be provided at two sides to ensure that the temperature of each layer of hot press plate is the same, so that the two sides of the plates between the hot press plates are heated uniformly, and the obtained plates in the same batch have the same quality.
In a preferred embodiment, the steam flow rate entering the middle layer hot press plate is 80-90% of the steam flow rate entering the two side layer hot press plates.
In a preferred embodiment, the steam flow rate into the middle layer hot press plate is 85% of the steam flow rate into the two side layer hot press plates.
As a preferred embodiment, the straw board hot press system further comprises:
the circulating recovery device 5 is respectively connected with the outlet of the steam pipeline of each layer of hot pressing plate and the outlet of the cold water pipeline and is used for recovering steam condensate water in the steam pipeline and cold water after heat exchange in the cold water pipeline; the recycling device 5 is also connected with the steam heating device 3 and provides water source for the steam heating device 3.
Steam is because the comdenstion water that the cooling of cold water formed in the steam conduit of every layer of hot pressboard, and cold water in the cold water pipeline, after carrying out the heat exchange with steam in the steam conduit, absorbs the heat in the steam, heats cold water into the warm water, and the warm water passes through water pump 53 and pipeline 51, enters into once more in the steam heating device 3, the comdenstion water of steam and the cold water after the heat exchange all have certain temperature, heat this warm water into steam, can reduce the waste of the heating energy.
The circulating hot water formed by cooling the cold water cooling device and the high-temperature steam condensate water formed by the steam heating device are recovered through the circulating recovery device, and the warm water in the circulating recovery device can be supplied to the steam heating device. The energy utilization efficiency is improved by recycling the circulating hot water and the steam condensate water in the hot pressing plate.
As a preferred embodiment, the straw board hot press system further includes a temperature detecting element 211, which is disposed on the multiple layers of hot press boards 12 and is used for detecting the temperature in each layer of hot press boards.
The temperature detection element 211 is also connected to the control device 2 through a signal line 21, and the signal line 21 feeds back the temperature detected by the temperature detection element 211 to the control device 2.
As a preferred embodiment, a steam flow control valve 23 is respectively arranged at the inlet of the steam pipeline of each layer of hot pressing plate, the steam flow control valve 23 is connected with the steam controller 22, and the steam controller adjusts the steam flow control valve 23 by receiving the temperature feedback of the temperature detection element 211, so as to adjust the steam flow of the steam entering the steam pipeline of each layer of hot pressing plate.
The opening of the steam flow valve 23 is controlled, so that the temperature of the straw board 13 is rapidly raised after pressurization, after the board pressurization, the temperature of each layer of hot pressing board is collected by being connected with the temperature measuring element 211 on each layer of hot pressing board, and the flow of the steam flow valve 23 is adjusted through the steam controller 22 by a distribution control system, such as a Programmable Logic Controller (PLC), according to the temperature of each layer of hot pressing board, so that the steam flow passing through the hot pressing board in the inner layer is lower than the steam flow of the upper layer and the lower layer, and the problems of board explosion and deformation of the straw board caused by unbalanced temperature of the hot pressing board due to different heat dissipation conditions in the pressure maintaining process are solved.
As a preferred embodiment, a flow meter is respectively arranged at the inlet of the steam pipeline of each layer of hot pressing plate, and the flow of the steam entering each layer of hot pressing plate is measured.
As a preferred embodiment, a cold water control valve is arranged on the cold water cooling device 4 and is arranged in front of an inlet of a cold water pipeline of each layer of hot pressing plate;
the control device 2 further comprises a cold water controller 24, wherein the cold water controller 24 is connected with the cold water pump 43 to control the start and stop of the cold water pump 43.
After the pressure maintaining process of the straw board is finished, steam supplied to the hot pressing board is cut off, the cold water pump is connected with the cold water pipe on each layer of hot pressing board, the cold water pipe is arranged in each layer of hot pressing board and parallel to the steam pipe, the temperature is rapidly reduced, the problem that the temperature reduction speed of the hot pressing board is slow is solved, the pressure relief temperature of the straw board is rapidly reached, the stay time of the straw board in the hot press is obviously shortened, and the efficiency of the hot pressing straw board is greatly improved.
As a preferred embodiment, as shown in fig. 2, on each layer of hot press plates, the steam pipe and the cold water pipe are arranged in parallel, and the steam flow direction in the steam pipe is opposite to the cold water flow direction in the cold water pipe.
Two pipelines are arranged in each layer of hot pressing plate, one pipeline is a steam circulating pipeline and is connected with a steam inlet pipeline, and the other pipeline is a cold water circulating pipeline and is arranged in parallel with the steam circulating pipeline and is connected with a cold water inlet pipeline. When the straw board is heated and heated, hot steam is introduced into the board, the hot pressboard is rapidly heated, when the pressure maintaining time is over, the steam is cut off by the steam distribution device, cold water is introduced into the hot pressboard, and the hot pressboard is rapidly cooled, so that the aims of shortening the board pressurizing time and remarkably improving the board production efficiency are fulfilled.
The straw board hot press system adopts a heating mode of a multilayer steam hot press plate, utilizes the characteristic that high-temperature steam is fast in temperature reduction, heats the multilayer overlapped hot press plates through the high-temperature steam, cuts off the steam supplied to the hot press plates through the flow control valve after the pressure maintaining process of the straw board is finished, starts the cold water pump of the cold water cooling device, and leads cold water into a pipeline parallel to a steam pipeline in the hot press plates, so that the temperature reduction speed is fast, the problem of slow temperature reduction speed when heat conduction oil and the hot press plates are cooled together is solved, the retention time of the straw board in the hot press is obviously shortened, and the efficiency of hot pressing the straw board is greatly improved while the quality of the board is ensured.
The steam input pipeline and the steam output pipeline are not specifically limited in position in the embodiment, and can be arranged at the same end of the hot pressing plate or at two ends of the hot pressing plate respectively according to actual needs.
According to the embodiment of the invention, the steam flow distributed to the steam input pipeline of each layer of hot pressing plate is adjusted by the control device according to the temperature fed back by the temperature measuring element on the hot pressing plate, so that the heat exchange rate of each layer of hot pressing plate is different, the uniform temperature is ensured and the quality of the straw board is ensured when the hot pressing plate is maintained at high temperature, and meanwhile, the temperature is quickly reduced by the cold water cooling device, so that the production efficiency of the straw board is improved. For example, when the straw board is located at different positions of the multilayer board, the steam controller enables the hot pressing boards located in the middle layer to distribute less steam, and the hot pressing boards located in the two side layers to distribute more steam, so that the straw board in the middle layer and the straw board in the two side layers are in a uniform speed when being heated and cooled, the temperature is uniform when the pressure is maintained at a high temperature, and the better quality of the straw board is achieved.
The controller can also be used for controlling the input and output time of high-temperature steam and cold water cooling decoration entering the hot pressing plate and the opening-cutting cycle process, and completing the cycle processes of temperature rise, pressure maintaining, heat preservation and rapid cooling.
The steam in the steam heating equipment can be self-produced, for example, a steam heating boiler is used for providing hot steam, an external heating station can also be adopted, and the temperature of the steam entering the straw plate hot press is 160-220 ℃.
As shown in fig. 1, when using the straw board hot press system, pre-pressing the straw board 13, respectively stacking a layer of pre-pressed straw board 13 between two hot press boards 12, respectively, the control device 2 distributing the steam in the steam heating device 3 to the steam input pipeline 31 of each layer of hot press board, the steam in the steam input pipeline 31 of each layer of hot press board enters into the corresponding hot press board 12, inputting high temperature steam to each layer of hot press board 12, introducing high temperature steam first to heat the hot press board 12, maintaining the pressure after the straw board hot press 1 is pressurized to a certain pressure, controlling the steam flow valve 23 on the steam input pipeline 31 by the control device 2 according to the feedback of the temperature measuring element 211 on the hot press board, distributing steam with different flow rates, keeping the hot press board 12 at a certain high temperature and maintaining the pressure, and accelerating the curing reaction process of the cementing material in the straw board, after the pressure maintaining time reaches the set time, under the condition of maintaining the pressure, the steam controller 22 controls the steam flow control valve 23 to cut off steam supply, and simultaneously controls the cold water pump 43 on the cold water cooling device 4 to feed cold water into the pipeline of the hot pressing plate through the cold water pipeline 41, so that the cooling process of the hot pressing plate 12 and the overlapped straw plate 13 is accelerated, the plate explosion and deformation of the straw plate after the pressure is released in the high-temperature process are prevented, and after the pressure is reduced to a certain temperature, if the temperature is lower than 90 ℃, the pressure is released by the straw plate hot press 1, the straw plate 13 is turned out to other positions for curing, and one-time plate making process circulation is completed.
When the straw board 13 is pressed, the control device 2 controls the input and output time of high-temperature steam and cold water entering the hot pressing plate 12 and the circulation processes of opening and cutting off, and the circulation processes of temperature rise, pressure maintaining and heat preservation and rapid temperature reduction are completed.
Meanwhile, when the cold water of the cold water cooling device 4 circulates in the hot pressing plate, the heat of the high-temperature steam is absorbed through heat exchange to become warm water, the warm water flows out of the hot pressing plate and enters the circulation recovery device 5 through the warm water pipeline 42, the hot steam is cooled and condensed through the cold water and also flows into the circulation recovery device 5 through the output pipeline 32, and is supplied to the steam heating device 3 through the water pump 53 and the water supply pipeline 51, so that the heat in the warm water is fully utilized, and the energy consumption is reduced.
In the description of the present invention, it should be noted that the terms "upper", "lower", "horizontal", "vertical", and the like indicate orientations or positional relationships based on methods or positional relationships shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In addition, in the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
It will be appreciated that the relevant features of the devices described above may be referred to one another. In addition, "first", "second", and the like in the above embodiments are for distinguishing the embodiments, and do not represent merits of the embodiments.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any simple modification, equivalent change and modification made to the above embodiment according to the technical spirit of the present invention are still within the scope of the technical solution of the present invention.
Claims (10)
1. A straw board hot press system comprises a straw board hot press, wherein the straw board hot press comprises a rack and a plurality of layers of hot press boards arranged on the rack; it is characterized in that each layer of hot pressing plate is respectively provided with a steam pipeline and a cold water pipeline;
the straw panel hot press system further comprises:
the steam heating device is respectively connected with the inlet of the steam pipeline of each layer of hot pressing plate, and provides required steam for the straw board hot press so that each layer of hot pressing plate is heated to the required temperature;
the cold water cooling device is respectively connected with the inlet of the cold water pipeline of each layer of hot pressing plate and used for providing required cold water for the straw board hot press so as to reduce the temperature of each layer of hot pressing plate to the required temperature;
and the control device comprises a steam controller, the steam controller is connected with the steam pipeline and is used for controlling the steam flow of the steam in the steam heating device entering each layer of hot pressing plate, so that the steam flow entering the two side layers of the multilayer hot pressing plates is larger than the steam flow in the middle layer.
2. The straw board hot press system of claim 1, wherein the flow rate of steam entering the middle layer hot press board is 70-100% of the flow rate of steam entering the two side layer hot press boards.
3. The straw board hot press system of claim 1, wherein the flow rate of steam entering the middle layer hot press board is 80-90% of the flow rate of steam entering the two side layer hot press boards.
4. The straw board hot press system of claim 1, wherein the steam flow entering the middle layer hot press board is 85% of the steam flow entering the two side layer hot press boards.
5. The straw board hot press system of claim 1, further comprising:
the circulating recovery device is respectively connected with the outlet of the steam pipeline of each layer of hot pressing plate and the outlet of the cold water pipeline and is used for recovering steam condensate water in the steam pipeline and cold water after heat exchange in the cold water pipeline; the circulation recovery device is also connected with the steam heating device and provides a water source for the steam heating device.
6. The straw panel hot press system of claim 1, further comprising a temperature sensing element disposed on the plurality of layers of hot press plates for sensing a temperature in each layer of hot press plates.
7. The straw board hot press system according to claim 6, wherein a steam flow control valve is respectively arranged at an inlet of the steam pipeline of each layer of hot press board, the steam flow control valve is connected with the steam controller, and the steam controller adjusts the steam flow control valve through temperature feedback received from the temperature detection element so as to adjust the steam flow of the steam entering the steam pipeline of each layer of hot press board.
8. The straw board hot press system according to claim 7, wherein a flow meter is provided at an inlet of the steam pipeline of each hot press plate to measure a flow rate of steam entering each hot press plate.
9. The straw board hot press system of claim 1,
the cold water cooling device is provided with a cold water control valve which is arranged in front of the inlet of the cold water pipeline of each layer of hot pressing plate;
the control device further comprises a cold water controller, and the cold water controller is connected with the cold water control valve and controls the on-off of the cold water control valve.
10. The straw board hot press system of claim 1, wherein the steam conduit and the cold water conduit are arranged in parallel on each hot platen, and the steam flow direction in the steam conduit is opposite to the cold water flow direction in the cold water conduit.
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| CN201911359973.3A CN111015890A (en) | 2019-12-25 | 2019-12-25 | Straw board hot press system |
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| CN201911359973.3A CN111015890A (en) | 2019-12-25 | 2019-12-25 | Straw board hot press system |
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| CN111015890A true CN111015890A (en) | 2020-04-17 |
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| CN101670606A (en) * | 2008-09-08 | 2010-03-17 | 富朗投资管理集团(香港)有限公司 | Hot-pressing system for manufacturing board by utilizing crop straws |
| CN102320068A (en) * | 2011-09-21 | 2012-01-18 | 南京林业大学 | A kind of bamboo of improved high-frequency heating/wood reconstituted material manufacturing approach |
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| US20160361833A1 (en) * | 2015-06-15 | 2016-12-15 | Fpinnovations | Radio-frequency methods for engineered wood products |
| CN108189195A (en) * | 2018-03-23 | 2018-06-22 | 阜阳市宏桥建材有限公司 | A kind of straw board hot press |
| CN209831952U (en) * | 2019-03-18 | 2019-12-24 | 湖南雪峰山竹业有限公司 | Water-saving and energy-saving device of multilayer hot press |
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2019
- 2019-12-25 CN CN201911359973.3A patent/CN111015890A/en not_active Withdrawn
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101670606A (en) * | 2008-09-08 | 2010-03-17 | 富朗投资管理集团(香港)有限公司 | Hot-pressing system for manufacturing board by utilizing crop straws |
| CN102320068A (en) * | 2011-09-21 | 2012-01-18 | 南京林业大学 | A kind of bamboo of improved high-frequency heating/wood reconstituted material manufacturing approach |
| CN203611323U (en) * | 2013-10-09 | 2014-05-28 | 陈军强 | Wood-based panel hot press |
| US20160361833A1 (en) * | 2015-06-15 | 2016-12-15 | Fpinnovations | Radio-frequency methods for engineered wood products |
| CN108189195A (en) * | 2018-03-23 | 2018-06-22 | 阜阳市宏桥建材有限公司 | A kind of straw board hot press |
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Application publication date: 20200417 |