CN211517840U - Plate blank preheating device - Google Patents
Plate blank preheating device Download PDFInfo
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- CN211517840U CN211517840U CN201921697415.3U CN201921697415U CN211517840U CN 211517840 U CN211517840 U CN 211517840U CN 201921697415 U CN201921697415 U CN 201921697415U CN 211517840 U CN211517840 U CN 211517840U
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- air
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- mesh belt
- pipeline
- preheating
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Abstract
The utility model discloses a slab preheating device, which comprises an upper frame, a lower frame, an upper mesh belt conveying mechanism and a lower mesh belt conveying mechanism, wherein the upper mesh belt conveying mechanism and the lower mesh belt conveying mechanism are arranged in the upper frame and the lower frame, a slab passes between the upper mesh belt and the lower mesh belt and is preheated by a preheating mechanism, the preheating mechanism comprises an air supply fan, an air heater, a steam mixer group and an air supply pipeline, the outlet of the air supply fan is connected with the inlet of the air heater through the air supply pipeline, the outlet of the air heater is connected with the hot air inlet of the mixer on the steam mixer through a hot air conveying pipeline, the saturated steam inlet on the steam mixer is connected with a saturated steam source through a saturated steam regulating valve and a saturated steam conveying pipeline, the dry and wet air outlet on the steam mixer is connected with the air supply pipeline through the dry and wet air conveying pipeline, a plurality, and dry and wet air blown out from an air outlet of the air supply pipeline is blown to the slab through the upper mesh belt or/and the lower mesh belt to preheat the slab.
Description
Technical Field
The utility model relates to an wood-based plate processing equipment technical field, in particular to slab preheating device.
Background
In the field of the production of wood-based panels, which is now increasingly competitive, products of good quality and low production cost are required in order to make the produced wood-based panels (MDF, PB) competitive in the market.
The quality of raw materials used by many users is very poor at present, after fiber separation is carried out by a defibrator, the dust content in the obtained fiber is high, the pre-pressed plate blank can generate outward airflow after entering a continuous press, the airflow generated when a certain speed is reached can damage the fiber shape of the surface of the plate blank, and dust spots are generated on the surface after the plate blank is pressed, so that the improvement of the surface quality and the yield of the product is influenced.
In the production process of the artificial board, slab hot pressing is a key process influencing the quality of the artificial board, and various hot pressing defects, such as slab surface solidification, delamination and the like, are often caused due to uneven heating, unstable temperature rise and the like in the slab hot pressing process. If the plate blank is preheated, namely the plate blank is heated to a certain temperature before entering the press, the heat transfer in the hot pressing process of the artificial board can be improved, so that the reasonable preheating process and heating equipment can provide the uniformity of heat transfer during the hot pressing of the plate blank, the temperature rise time is reduced, the production efficiency is improved, the energy is saved, and the production cost is reduced.
In the existing artificial board continuous production line, a platen blank preheating device 3 is added between a forming belt conveyor 1 and a board feeding conveyor 2, a board blank is paved by a paving machine 4 and is pre-pressed by a pre-pressing machine 5, then is conveyed to the platen blank preheating device 3 and the board feeding conveyor 2 by the forming belt conveyor, and then enters a continuous press 6 for pressing, and the installation position is shown in fig. 1. The slab preheating device 3 can compress the slab by a certain amount while improving the slab temperature by 30-50 ℃ by utilizing a hot air heating principle, and can reduce the exhaust volume generated during slab compression when entering the continuous press 6, thereby solving the problem of dust spots. In the case of a continuous press 6 with constant heating, the slab must be pressed at an increased line speed, thereby increasing the production capacity of the line.
However, in the prior slab preheating device for preheating the slab by using hot air, the preheating temperature of the slab is lower, and meanwhile, condensed water is formed on the surface of the slab.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that the preheating temperature ratio that exists to the present slab preheating device that adopts the hot-air to preheat the slab will form the comdenstion water problem on the slab surface simultaneously and provide a slab preheating device.
The utility model discloses the technical problem that will solve can realize through following technical scheme:
the plate blank preheating device comprises an upper frame, a lower frame, an upper mesh belt conveying mechanism arranged in the upper frame and a lower mesh belt conveying mechanism arranged in the lower frame, wherein a plate blank passes through a space between an upper mesh belt in the upper mesh belt conveying mechanism and a lower mesh belt in the lower mesh belt conveying mechanism and is preheated by a preheating mechanism, the plate blank preheating device is characterized in that the preheating mechanism comprises an air supply fan, an air heater, a steam mixer group and an air supply pipeline, an outlet of the air supply fan is connected with an inlet of the air heater through the air conveying pipeline, an outlet of the air heater is connected with a hot air inlet on the steam mixer through the hot air conveying pipeline, a saturated steam inlet on the steam mixer is connected with a saturated steam source through a saturated steam regulating valve and the saturated steam conveying pipeline, and a dry and wet air outlet on the steam mixer is connected with the air supply pipeline through a dry and wet air conveying pipeline, the air supply pipeline is provided with a plurality of air outlets, the air outlets face the upper net belt or/and the lower net belt, and dry and wet air blown out from the air outlets of the air supply pipeline is blown to the slab through the upper net belt or/and the lower net belt to preheat the slab.
The utility model discloses a preferred embodiment still includes a negative pressure forming device, negative pressure forming device includes an exhaust fan and suction line, exhaust fan's air intake passes through the exhaust line and is connected with the air outlet of suction line, the last a plurality of suction openings that have of suction line, the air outlet face go up the guipure or/and lower guipure, with the air outlet one-to-one of supply air duct.
In a preferred embodiment of the present invention, the upper and lower mesh belt conveying mechanisms further comprise at least an upper and a lower pressing plates and an upper and a lower heating mesh boxes, wherein the upper pressing plate and the upper heating mesh box are connected to the upper frame together by bolts, the upper mesh belt passes through the bottom of the upper heating mesh box, a separate upper frame lifting mechanism drives the upper frame, the upper pressing plate and the upper heating mesh box to lift together, and a downward positive pressure is applied to the slab through the upper mesh belt by means of its own gravity; the lower pressurizing pressure plate and the lower heating net cage are connected with the lower rack through bolts, and the lower net belt passes through the top of the lower heating net cage.
In a preferred embodiment of the present invention, the upper pressing plate and the upper heating net box are heated together, and the lower pressing plate and the lower heating net box are heated together by using separate heating devices.
In a preferred embodiment of the utility model, still include a slab preheating temperature detection device, slab preheating temperature detection device is used for detecting slab preheating temperature to carry the slab preheating temperature that detects to a slab preheating controlling means, slab preheating controlling means with air heater, saturated steam governing valve control connection.
Since the technical scheme as above is used, the utility model discloses a humid air that hot-air and saturated steam mix preheats the slab, and it can not produce the comdenstion water on the surface of slab again when improving slab preheating temperature.
Drawings
Fig. 1 is a schematic composition diagram of a conventional artificial board continuous production line.
Fig. 2 is a schematic diagram of the plate blank preheating device of the present invention.
Fig. 3 is a schematic diagram of the principle of the air heating, the upper and lower pressing plates, and the upper and lower heating net cages of the present invention.
Detailed Description
The invention is further described with reference to the accompanying drawings and the detailed description
Referring to fig. 2, the slab preheating apparatus shown in the figure includes an upper frame 100, a lower frame 200, an upper belt conveyor 300 disposed in the upper frame 100, and a lower belt conveyor 400 disposed in the lower frame 200.
The upper mesh belt conveying mechanism 300 comprises an upper mesh belt driving roller 310, an upper mesh belt tensioning roller 320, an upper mesh belt deviation rectifying mechanism 330, an upper pressurizing pressure plate 340, an upper heating mesh box 350 and an upper mesh belt 360, wherein the upper mesh belt driving roller 310, the upper mesh belt tensioning roller 320 and the upper mesh belt deviation rectifying mechanism 330 are installed in the upper rack 100, and the upper mesh belt 360 surrounds the upper mesh belt driving roller 310, the upper mesh belt tensioning roller 320 and the upper mesh belt deviation rectifying mechanism 330. The upper pressurizing platen 340 and the upper heating net cage 350 are connected together to the upper frame 100 by bolts. The upper mesh belt 360 passes through the bottom of the upper heating net cage 350. The upper frame 100, the upper pressurizing press plate 340 and the upper heating net cage 350 are driven to lift by a single upper frame lifting mechanism, and downward positive pressure is applied to the slab 500 through the upper net belt 360 by means of the self gravity;
the lower mesh belt conveying mechanism 400 comprises a lower mesh belt driving roller 410, a lower mesh belt tensioning roller 420, a lower mesh belt deviation rectifying mechanism 430, a lower pressurizing pressing plate 440, a lower heating mesh box 450 and a lower mesh belt 460, wherein the lower mesh belt driving roller 410, the lower mesh belt tensioning roller 420 and the lower mesh belt deviation rectifying mechanism 430 are installed in the lower rack 200, and the lower mesh belt 460 surrounds the lower mesh belt driving roller 410, the lower mesh belt tensioning roller 420 and the lower mesh belt deviation rectifying mechanism 430. The lower pressurizing platen 440 and the lower heating net cage 450 are coupled together with the lower frame 200 by bolts. The lower mesh belt 360 passes over the top of the lower heated box 350.
The slab 500 passes between the upper mesh belt 360 and the lower mesh belt 460 and is preheated by a preheating mechanism. During the preheating process, a separate upper frame lifting mechanism (not shown) controls the upper pressing platen 340, the upper heating net cage 350 and the upper frame 100 to be lifted together, and a downward positive pressure is applied to the slab 500 through the upper net belt 360 while the thickness of the preheated slab 500 is controlled.
Referring to fig. 3, the upper pressurizing pressure plate 340, the upper heating net cage 350, the lower pressurizing pressure plate 440 and the lower heating net cage 450 are heated by independent heating systems, which may be heat-conducting oil, and these independent heating systems are composed of some pipelines and valves, and are connected to a heat-conducting oil boiler, and how to form the heating system is realized by those skilled in the art without creative labor, and are not described herein. This prevents the wet air mixed with the saturated steam from generating condensed water in the upper pressurizing platen 340, the upper heating net cage 350, the lower pressurizing platen 440, and the lower heating net cage 450.
The utility model discloses a preheat mechanism includes air supply fan 610, air heater 620, steam mixer group 630 and supply air duct 640, air supply fan 610's export is passed through air conveying pipeline and air heater 620's entry linkage, air heater 620's export is passed through the hot-air inlet on hot-air line and the steam mixer 630 and is connected, saturated steam entry on the steam mixer group 630 is passed through saturated steam governing valve 631 and saturated steam line and is connected with the saturated steam source, the export of the dry humid air on the steam mixer group 630 is connected with supply air duct 640 through dry humid air line.
The heating medium of the air heater 620 is heat conducting oil, referring to fig. 3, the air heater 620 is connected with the heat conducting oil boiler through some pipelines and valves, and it is possible for those skilled in the art to realize the connection without creative labor, and details are not described herein. Thus, the air heater 620 is heated by an independent heating device, so that the heating temperature of the hot air can be controlled conveniently.
The air supply duct 640 has three sets of air outlets 641, 642, 643, the two sets of air outlets 641, 643 facing the upper net belt 360 and located at two ends of the upper pressing plate 340 and the upper heating net cage 350, and the air outlet 642 facing the lower net belt 460 and located at the middle position of the lower pressing plate 440 and the lower heating net cage 450. The wet and dry air from the outlets 641, 643 of the supply duct 640 is blown through the upper mesh belt 360 toward the mat 500 to preheat the mat 500. The wet and dry air blown out from the air outlet 642 of the air supply duct 640 is blown toward the mat 500 through the lower mesh belt 460 to preheat the mat 500.
In order to facilitate the dry and wet air flow to penetrate through the slab 500, the utility model also comprises a negative pressure forming device 700, the negative pressure forming device 700 comprises an air draft fan 710 and an air draft pipeline 720, the air inlet of the air draft fan 710 is connected with the air outlet of the air draft pipeline 720 through an air draft pipeline, three groups of air draft openings 721, 722 and 723 are arranged on the air draft pipeline 720, the air outlets of the two groups of air draft openings 721 and 723 face the lower mesh belt 460 and are positioned at the two ends of the lower pressure pressing plate 440 and the lower heating mesh box 450, and are simultaneously opposite to the two groups of air outlets 641 and 643 one by one; the air suction opening 722 faces the upper mesh belt 460 and is located at a position intermediate the upper pressing platen 340 and the lower heating mesh cage 350, opposite to the air outlet 612.
The utility model discloses an air supply duct 640 and exhaust duct 720 adopt above-mentioned mode to arrange, can make slab 500's preheating temperature even.
The utility model discloses still include a slab preheating temperature detection device 800, slab preheating temperature detection device 800 is used for detecting slab preheating temperature to carry the slab preheating temperature that detects to a slab preheating controlling means electrical control system (not shown in the figure), slab preheating controlling means electrical control system and air heater 620, saturated steam governing valve 631 control connection.
The slab preheating temperature detection device 800 is arranged at the inlet and the outlet of the slab preheating device, the dew point temperature in the humid air is set according to the surface temperature requirement of the slab 500 at the outlet, and the supply amount of the saturated steam can be automatically adjusted through the saturated steam adjusting valve 631 according to the set dew point temperature of the humid air.
A slab preheating method for raising slab temperature is characterized by that firstly, the air is heated to above 100 deg.C, then mixed with saturated steam whose temperature is above 130 deg.C so as to form wet air containing more heat quantity; the moist air containing more heat is then fed into the mat 500 through the three sets of outlets 641, 642, 643 of the supply duct 640 and the upper and lower wire belts 360, 460 to preheat the mat 500. Because the three groups of air suction openings 721, 722 and 723 are arranged on the air suction pipeline 720 and are opposite to the three groups of air outlet openings 641, 642 and 643 of the air supply pipeline 640 one by one, negative pressure is generated by the air suction fan 710, so that the wet air flow blown out by the three groups of air outlet openings 641, 642 and 643 of the air supply pipeline 640 can penetrate through the slab 500.
The temperature and humidity of the moist air, which contains more heat, determines its dew point temperature, and when the temperature of the moist air drops below its dew point, the moisture in the moist air changes from a gaseous state to a liquid state, which releases heat, thereby raising the temperature of the mat 500.
In order to prevent the wet air from generating condensed water in the conveying process, the air must be heated to more than 100 ℃, the heated air heats the air supply pipeline 640, the upper pressurizing pressing plate 340, the upper heating net cage 350, the lower pressurizing pressing plate 440, the lower heating net cage 450, the upper net belt 360 and the lower net belt 460, and the heating temperature is far higher than the dew point temperature of the wet air so that the saturated steam can be mixed to form the wet air to heat the plate blank 500.
In order to prevent the high-temperature wet air from overflowing, the upper mesh belt 360 and the lower mesh belt 460 must contact the slab 500 and generate a certain positive pressure when heating, and since the upper and lower positions of the lower frame 200, the lower pressing platen 440, the lower heating mesh net 450, and the lower mesh belt 460 are fixed, a separate upper frame lifting mechanism (not shown) controls the upper frame 100, the upper pressing platen 340, the upper heating mesh net 350, and the upper mesh belt 360 to lift, and during the lowering process, the slab 500 is applied with a downward positive pressure through the upper mesh belt 360.
Claims (5)
1. The plate blank preheating device comprises an upper frame, a lower frame, an upper mesh belt conveying mechanism arranged in the upper frame and a lower mesh belt conveying mechanism arranged in the lower frame, wherein a plate blank passes through a space between an upper mesh belt in the upper mesh belt conveying mechanism and a lower mesh belt in the lower mesh belt conveying mechanism and is preheated by a preheating mechanism, the plate blank preheating device is characterized in that the preheating mechanism comprises an air supply fan, an air heater, a steam mixer group and an air supply pipeline, an outlet of the air supply fan is connected with an inlet of the air heater through the air conveying pipeline, an outlet of the air heater is connected with a hot air inlet on the steam mixer through the hot air conveying pipeline, a saturated steam inlet on the steam mixer is connected with a saturated steam source through a saturated steam regulating valve and the saturated steam conveying pipeline, and a dry and wet air outlet on the steam mixer is connected with the air supply pipeline through a dry and wet air conveying pipeline, the air supply pipeline is provided with a plurality of air outlets, the air outlets face the upper net belt or/and the lower net belt, and dry and wet air blown out from the air outlets of the air supply pipeline is blown to the slab through the upper net belt or/and the lower net belt to preheat the slab.
2. The slab preheating device according to claim 1, further comprising a negative pressure forming device, wherein the negative pressure forming device comprises an air draft fan and an air draft pipeline, an air inlet of the air draft fan is connected with an air outlet of the air draft pipeline through an air draft pipeline, a plurality of air draft openings are formed in the air draft pipeline, and the air outlet faces the upper mesh belt or/and the lower mesh belt and is opposite to an air outlet of the air supply pipeline one by one.
3. A slab preheating device according to claim 1, wherein the upper and lower mesh belt conveying mechanisms further comprise at least upper and lower pressing plates and upper and lower heating mesh boxes, wherein the upper pressing plate and the upper heating mesh box are connected together with the upper frame by bolts, the upper mesh belt passes through the bottom of the upper heating mesh box, a separate upper frame lifting mechanism drives the upper frame, the upper pressing plate and the upper heating mesh box to lift together, and downward positive pressure is applied to the slab through the upper mesh belt by means of its own gravity; the lower pressurizing pressure plate and the lower heating net cage are connected with the lower rack through bolts, and the lower net belt passes through the top of the lower heating net cage.
4. A slab preheating device as claimed in claim 1, wherein the upper press platen is heated together with the upper heating net cage, and the lower press platen and the lower heating net cage are heated together by separate heating means.
5. The slab preheating device according to any one of claims 1 to 4, further comprising a slab preheating temperature detection device for detecting the slab preheating temperature and supplying the detected slab preheating temperature to a slab preheating control device, wherein the slab preheating control device is in control connection with the air heater and the saturated steam regulating valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921697415.3U CN211517840U (en) | 2019-10-11 | 2019-10-11 | Plate blank preheating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921697415.3U CN211517840U (en) | 2019-10-11 | 2019-10-11 | Plate blank preheating device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211517840U true CN211517840U (en) | 2020-09-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921697415.3U Active CN211517840U (en) | 2019-10-11 | 2019-10-11 | Plate blank preheating device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211517840U (en) |
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2019
- 2019-10-11 CN CN201921697415.3U patent/CN211517840U/en active Active
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