Low-energy-consumption and high-efficiency shaving drying method and drying equipment thereof

Abstract

The present application relates to the technical field of shaving drying, and discloses a low-energy-consumption high-efficiency shaving drying method and drying equipment, wherein the thickness of the shaving is 0.03-0.30 mm, and the initial moisture content is 50-90%; the bottom surface of the shaving tends to be flat under the suction force; and the top surface of the shaving is heated by a heat source with a certain distance from the shaving.The technical scheme of the present application can be applied to the drying of thin shaving, and has the advantages of high efficiency and low energy consumption.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of shaving drying, and more particularly to a low-energy-consumption and high-efficiency shaving drying method; the present application also relates to a device suitable for implementing the low-energy-consumption and high-efficiency shaving drying method. BACKGROUND

[0002] Shavings are the main raw material for manufacturing shaving boards, and shaving boards are prepared after drying, gluing, assembling, and pressing. The drying quality of shavings, including the final moisture content, moisture content uniformity, and the shape of shavings after drying, can affect the uniformity of gluing, the amount of gluing, and the processing quality of subsequent processes, as well as the density, mechanical strength, and gluing performance of finished shaving boards.

[0003] The existing technology of shaving drying mostly uses single-channel or multi-channel drum dryers. For example, the patent for invention with the publication number CN110108101A and the name of "a wet shaving drying system and its drying process" discloses a technical solution for shaving drying using a single-channel or multi-channel drum dryer. However, this technical solution has a relatively high drying efficiency, but the drying temperature is relatively high, so the drying energy consumption is relatively large, and the shavings are prone to breakage during the high-temperature and tumbling process, affecting the shape of the shavings.

[0004] Another way of shaving drying is kiln drying. For example, the patent for invention with the publication number CN109556354A and the name of "a drying system for raw wood shavings" discloses a technical solution for shaving drying using a drying box similar to a drying kiln. This technical solution can relatively well avoid the breakage of shavings, but it has the problems of poor shaving drying uniformity and low drying efficiency.

[0005] In summary, there is a lack of a high-efficiency and low-energy-consumption shaving drying method in the existing technology. SUMMARY

[0006] The present application provides a low-energy-consumption and high-efficiency shaving drying method and its drying device.

[0007] In the first aspect of the present application, a low-energy-consumption and high-efficiency shaving drying method is provided, the thickness of the shavings is 0.03-0.30mm, the initial moisture content is 50-90%, the bottom surface of the shavings tends to spread flat under the suction force, and the top surface of the shavings is heated by a heat source at a certain distance.

[0008] The drying efficiency of the shavings is inversely proportional to the thickness of the shavings, and the drying energy consumption is proportional to the thickness of the shavings, so when the thickness of the shavings is relatively thin, the drying efficiency can be improved to a certain extent, and the drying energy consumption can be reduced. As a result, the shavings board obtained by thin shavings has the advantages of low density and high strength. Those skilled in the art know that although thin shavings with a thickness of 0.03-0.30 mm are easy to dry, they are prone to breakage during the drying process due to the C-shaped curling of the shavings, and it is difficult to obtain intact shavings. In order to maintain the shape of the intact shavings, a longer drying period is required. In addition, the concave surface of the curled shavings is not easy to glue during gluing, so the gluing strength of the shavings board is affected. Therefore, the application of thin shavings is rarely seen in the prior art.

[0009] In the technical scheme of the present application, by the above method, the suction force provided by the bottom surface of the shavings makes the shavings have a tendency to spread flat in the form of mechanical force, and at the same time, by forming a certain steam environment by keeping a distance between the heat source and the shavings, the shavings can be dried while maintaining the shape of the shavings under the protection of steam, and the shavings can be spread flat by the synergistic effect of the heat source, steam and suction force. Therefore, the technical scheme of the present application can be applied to the drying of thin shavings, and has the advantages of high efficiency and low energy consumption.

[0010] In some embodiments, the temperature of the heat source gradually decreases along the direction of movement of the shavings in the x-axis.

[0011] In some embodiments, the distance between the top surface of the shavings and the heat source gradually decreases along the direction of movement of the shavings in the x-axis.

[0012] In some embodiments, the suction force acting on the bottom surface of the shavings is a vacuum suction force, and the suction force can cause the shavings to deform by 20-50% of the height of the curling.

[0013] In some embodiments, the temperature of the heat source is 50-80℃.

[0014] In a second aspect of the present application, a drying equipment suitable for implementing the low-energy and high-efficiency shavings drying method of claim 1 is provided, comprising:

[0015] a rack extending in the x-axis direction;

[0016] a conveying mechanism mounted by the rack and capable of conveying in the x-axis direction;

[0017] A vacuum suction mechanism, comprising a main vacuum pipe fixedly installed through the frame and connected with a vacuum source pipe, a plurality of vacuum suction blocks respectively communicated with the main vacuum pipe, the vacuum suction blocks being capable of conveying the shavings along the x-axis direction under the driving of the conveying mechanism and providing suction force from the bottom surface of the shavings.

[0018] A continuous hot plate extending along the x-axis direction and adapted to provide heat source from the top surface of the shavings, the bottom surface of the continuous hot plate having a spacing with the top surface of the vacuum suction block, the spacing allowing the bottom surface of the continuous hot plate to have a distance with the top surface of the shavings.

[0019] In some embodiments, the main vacuum pipe comprises a main vacuum pipe cavity, a communication port arranged at the bottom surface or side surface of the main vacuum pipe cavity, and a first communication groove arranged at the top surface of the main vacuum pipe cavity, the vacuum suction block comprises a suction block cavity, a second communication groove arranged at the bottom surface of the suction block cavity, and a suction port arranged at the top surface of the suction block cavity, the first communication groove and the second communication groove corresponding to each other when the vacuum suction block moves relative to the main vacuum pipe so as to communicate the vacuum suction block with the main vacuum pipe.

[0020] In some embodiments, the main vacuum pipe comprises a plurality of.

[0021] In some embodiments, the conveying mechanism comprises a pair of narrow belt conveying systems arranged at both sides of the frame, a pair of fixed blocks fixedly arranged at both sides of the vacuum suction block, and a connecting rod penetrating through the narrow belt and connecting the pair of fixed blocks.

[0022] In some embodiments, the continuous hot plate sequentially comprises a first flat plate segment, a second flat plate segment, and a third flat plate segment, the first flat plate segment and the second flat plate segment being connected through a first slope segment, the second flat plate segment and the third flat plate segment being connected through a second slope segment, and the spacing between the first flat plate segment, the second flat plate segment, the third flat plate segment, and the top surface of the vacuum suction block being 20-40 mm, 13-30 mm, and 8-15 mm, respectively.

[0023] In summary, the low-energy-consumption and high-efficiency shaving drying method and the drying equipment thereof can be applied to the drying of thin shavings, and have the advantages of high efficiency and low energy consumption. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings described below are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0025] Figure 1 A structural schematic diagram of a low-energy-consumption and high-efficiency shaving drying equipment according to an embodiment of the present application.

[0026] Figure 2 A structural schematic diagram of a rack and conveying mechanism according to an embodiment of the present application.

[0027] Figure 3 A structural schematic diagram of a vacuum adsorption mechanism according to an embodiment of the present application.

[0028] Figure 4 A structural schematic diagram of a main vacuum pipeline according to an embodiment of the present application.

[0029] Figure 5 A front view schematic diagram of a low-energy-consumption and high-efficiency shaving drying equipment according to an embodiment of the present application.

[0030] In the drawings: 100, rack, 200, conveying mechanism, 300, vacuum adsorption mechanism, 400, continuous hot plate, 110, return guide section, 120, turning guide section, 130, interval linking section, 210, mounting shaft, 220, narrow transmission roller, 230, narrow belt, 240, perforation, 310, main vacuum pipeline, 320, vacuum adsorption block, 330, fixed block, 340, connecting rod, 311, main vacuum pipeline cavity, 312, communication port, 313, first communication groove, 321, adsorption block cavity, 322, second communication groove, 323, adsorption port, 410, first flat section, 420, first slope section, 430, second flat section, 440, second slope section, 450, third flat section. DETAILED DESCRIPTION

[0031] In order to make the person skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should be within the scope of protection of the present application.

[0032] EMBODIMENT

[0033] REFERENCE Figure 1The illustrated low-energy-consumption and high-efficiency shaving drying equipment is suitable for drying ultra-thin shavings with a thickness of 0.03-0.30 mm and an initial moisture content of 50-90%. The shaving drying equipment comprises a rack 100, a conveying mechanism 200, a vacuum adsorption mechanism 300, and a continuous hot plate 400.

[0034] Reference Figure 2 As shown, the rack 100 is any one of the existing tunnel structures, extending along the x-axis direction, and suitable for providing installation spaces and supports for the mechanism components of the drying equipment. The rack 100 of the present embodiment comprises at least a support frame (not shown in the figure), a return guide section 110 fixedly installed through screwing or welding on the support frame, a turning guide section 120 fixedly installed through screwing or welding on both ends of the length direction of the return guide section 110, and a spacing connection section 130 fixedly installed through screwing or welding on the other end of the circular arc of the turning guide section 120. Optionally, the rack 100 further comprises a tunnel (not shown in the figure) fixedly installed through screwing or welding on the support frame and extending along the x-axis direction, and at least the outgoing section of the conveying mechanism 200, the vacuum adsorption mechanism 300, and the continuous hot plate 400 are arranged in the tunnel, so as to provide a relatively independent drying environment.

[0035] The conveying mechanism 200 is installed through the rack and can be conveyed along the x-axis direction. The conveying mechanism 200 comprises a pair of narrow-belt conveying systems arranged on both sides of the rack 100, and the conveying from the feeding end A to the discharging end B is the outgoing section of the narrow-belt conveying system, and the conveying from the discharging end B to the feeding end A is the return section of the narrow-belt conveying system. The narrow-belt conveying system is the existing technology, for example, comprising a pair of installation shafts 210, a pair of narrow transmission rollers 220 installed through the pair of installation shafts 210, a driving motor (not shown in the figure) driving the narrow transmission rollers 220, and a narrow belt 230 sleeved on the pair of narrow transmission rollers 220, wherein a plurality of perforations 240 are arranged on the narrow belt 230 in an interval. The narrow transmission rollers 220 of the pair of narrow-belt conveying systems are coaxially installed and synchronously rotated by the same driving motor. The surface of the narrow transmission roller 220 is provided with a ring-shaped groove.

[0036] Reference Figure 1 , Figure 3 and Figure 4, the vacuum suction mechanism 300 comprises a main vacuum pipeline 310 fixedly installed by screwing or welding through the frame 100 and connected with a vacuum source (not shown in the figure) pipeline, and a plurality of vacuum suction blocks 320 respectively communicated with the main vacuum pipeline 310. The vacuum source can be any one of the prior art. The main vacuum pipeline 310 is arranged between the outgoing sections of the pair of narrow belt conveying systems, and the main vacuum pipeline 310 comprises a main vacuum cavity 311 extending along the x-axis direction, a communication port 312 opened in the bottom surface or side surface of the main vacuum cavity 311, and a first communication groove 313 opened in the top surface of the main vacuum cavity 311. In the embodiment, the communication port 312 is opened in the bottom surface of the main vacuum cavity 311. The communication port 312 is a circular port for connecting the main vacuum cavity 311 with the vacuum source through the pipeline. The first communication groove 313 is a long groove arranged almost through the length direction of the main vacuum cavity 311. In the embodiment, the first communication groove 313 does not pass through the length direction of the main vacuum cavity 311, but stops at a distance of 0.5 cm from the end of the main vacuum cavity 311.

[0037] A pair of fixed blocks 330 are fixedly arranged on both sides of the vacuum suction block 320 by screwing or welding, and a connecting rod 340 is a screw rod group connected with the pair of fixed blocks 330 after passing through the perforation 240 of the narrow belt 230, so that the vacuum suction block 320 can reciprocate with the circulation of the narrow belt 230. The vacuum suction block 320 comprises a suction block cavity 321, a second communication groove 322 opened in the bottom surface of the suction block cavity 321, and a suction port 323 arranged on the top surface of the suction block cavity 321. The second communication groove 322 corresponds to the first communication groove 313 to communicate the suction block cavity 321 with the main vacuum cavity 311, and since the first communication groove 313 almost passes through the length of the main vacuum cavity 311, the suction block cavity 321 is always communicated with the main vacuum cavity 311 when the vacuum suction block 320 passes through the outgoing section during reciprocation.

[0038] The number of the vacuum suction blocks 320 can be determined according to the needs. In the embodiment, the number of the vacuum suction blocks 320 can satisfy that the side walls of the adjacent vacuum suction blocks 320 can abut against each other at least in the outgoing section of the conveying mechanism 200, so that the top surfaces of the plurality of vacuum suction blocks 320 can form a continuous conveying plane.

[0039] As a preferred embodiment, referring to FIG. 2, Figure 4 As shown in the figure, the main vacuum pipeline 310 comprises a plurality of, and in the embodiment, the main vacuum pipeline 310 comprises three. The three main vacuum pipelines 310 are independent and not communicated with each other, and are connected in parallel into the vacuum source, or are respectively communicated with three vacuum sources. In this scheme, the uniformity of the vacuum suction force can be ensured.

[0040] Referring to FIG. 2, Figure 5As shown, the continuous hot plate 400 is arranged above the vacuum suction block 320 and extends along the x-axis direction. The continuous hot plate 400 is a plate-type oil hot heat source in the prior art, which is in communication with an external hydraulic oil heat source and can supply heat above the vacuum suction block 320 towards the vacuum suction block 320. Along the feeding direction of the shavings, the continuous hot plate 400 sequentially includes a first flat plate section 410, a second flat plate section 430 and a third flat plate section 450, the first flat plate section 410 and the second flat plate section 430 are connected by a first slope section 420, and the second flat plate section 430 and the third flat plate section 450 are connected by a second slope section 440.

[0041] The spacing between the first flat plate section 410, the second flat plate section 430, the third flat plate section 450 and the top surface of the vacuum suction block 320 is 20-40 mm, 13-30 mm and 8-15 mm, respectively. The spacing between the continuous hot plate 400 and the top surface of the vacuum suction block 320 is to avoid the continuous hot plate 400 contacting the shavings conveyed on the surface of the vacuum suction block 320, so as to avoid the continuous hot plate 400 damaging the shape of the shavings, and at the same time, to form high-temperature steam between the continuous hot plate 400 and the shavings, so as to promote the shavings to be spread flat. Therefore, the actual distance between the continuous hot plate 400 and the top surface of the vacuum suction block 320 is determined according to the specifications of the shavings to be processed, mainly the length of the shavings.

[0042] For example, when the length of the batch of shavings is 35-50 mm and the thickness is 0.3-1.0 mm, the natural curling height of the shavings is 10-20 mm. By controlling the vacuum suction force, the vacuum suction block 320 causes the shavings to be flattened by 30-50% of the curling height by suction, and the actual curling height is 5-14 mm. In order to avoid the shavings with the maximum curling height from contacting the first flat section 410, the distance between the first flat section 410 and the top surface of the vacuum suction block 320 is preferably set to 20-29 mm. The shavings are heated so that the moisture in the shavings evaporates and forms a steam environment between the tunnel or the first flat section 410 and the vacuum suction block 320. Under the action of the steam, the first flat section 410 as a heat source, and suction, the moisture content of the shavings is reduced and is further flattened. When the shavings leave the first flat section 410 and enter the first slope section 420, the actual curling height of the shavings is 3-10 mm. In order to avoid the shavings with the maximum curling height from contacting the second flat section 430, the distance between the second flat section 430 and the top surface of the vacuum suction block 320 is preferably set to 13-20 mm. As the shavings are further flattened under the action of the steam and the heat source, when the shavings leave the second flat section 430 and enter the second slope section 440, the actual curling height of the shavings is 2-6 mm. In order to avoid the shavings with the maximum curling height from contacting the third flat section 450, the distance between the third flat section 450 and the top surface of the vacuum suction block 320 is preferably set to 8-12 mm. Accordingly, the temperature of the first flat section 410 is 70°C, the temperature of the first slope section 420 is 67°C, the temperature of the second flat section 430 is 65°C, the temperature of the second slope section 440 is 62°C, and the temperature of the third flat section 450 is 60°C, which are optional. 3 The energy consumption required for drying the shavings is about 75 degrees of electricity, which is 17% less than the energy consumption of 90 degrees of electricity in the prior art. After drying, the hemicellulose loss rate of the shavings is not more than 5%, and the cellulose loss rate is not more than 2%. The average length-to-diameter ratio is reduced by not more than 1.5%.

[0043] For example, when the length of the batch of shavings is 50-80 mm and the thickness is 1.0-3.0 mm, the natural curling height of the shavings is 16-30 mm. By controlling the vacuum suction force, the vacuum suction block 320 causes the shavings to be deformed by 20-35% of the curling height by suction, and the actual curling height is 10-24 mm, so the distance between the first flat section 410 and the top surface of the vacuum suction block 320 is preferably set to 25-40 mm. When the shavings leave the first flat section 410 and enter the first slope section 420, the actual curling height of the shavings is 12-20 mm, so the distance between the second flat section 430 and the top surface of the vacuum suction block 320 is preferably set to 22-30 mm. When the shavings leave the second flat section 430 and enter the second slope section 440, the actual curling height of the shavings is 5-12 mm, so the distance between the third flat section 450 and the top surface of the vacuum suction block 320 is preferably set to 10-15 mm. Accordingly, the temperature of the first flat section 410 is 80°C, the temperature of the first slope section 420 is 75°C, the temperature of the second flat section 430 is 70°C, the temperature of the second slope section 440 is 60°C, and the temperature of the third flat section 450 is 50°C. 3 The energy consumption for drying the shavings is about 80 degrees of electricity, which is 11% less than the energy consumption of 90 degrees of electricity in the prior art. After drying, the hemicellulose loss rate of the shavings is not more than 6%, and the cellulose loss rate is not more than 3%. The average length-to-thickness ratio is reduced by not more than 2%.

[0044] The first slope section 420 and the second slope section 440 are transition sections that connect the first flat section 410 and the second flat section 430, and the second flat section 430 and the third flat section 450, respectively, so the first slope section 420 and the second slope section 440 are both inclined. Preferably, the first slope section 420 and the second slope section 440 are curved transition surfaces.

[0045] The working principle of the low-energy high-efficiency shaving drying equipment of the embodiment is as follows: the shavings enter the conveying surface formed by the surfaces of the plurality of continuous vacuum suction blocks 320 from the feeding end A, and are deformed to flatten under the action of the suction force of the vacuum suction blocks 320. At this time, the suction force provided by the vacuum suction blocks 320 should be controlled to be within the acceptable range of the toughness of the wet shavings, so as to avoid damage to the shavings caused by excessive suction force. Then, the shavings are heated by the continuous hot plate 400 as a heat source, and the moisture evaporates to form a steam environment between the continuous hot plate 400 and the vacuum suction block 320. Under the action of the continuous hot plate 400 and the protection of the steam, the moisture content of the shavings is reduced and gradually flattened until they leave through the discharging end B.

[0046] The foregoing description is provided for purposes of illustration and is not intended to be limiting. Numerous implementations and many embodiments, in addition to those described herein, will be apparent to those skilled in the art from this detailed description, which shows and describes only certain embodiments. Thus, the scope of the present teachings should not be determined from the above description, but should be determined from the appended claims and their full scope, including equivalents to which they are entitled. The disclosures of all articles and references, including patent applications and publications, are incorporated by reference for all purposes in the present document. The omission in the foregoing description of any aspect of the subject matter disclosed herein is not a disclaimer of such subject matter, nor should it be construed as a disavowal of such subject matter.

Claims

1. A drying equipment, characterized in that, include: A frame that extends along the x-axis; A conveying mechanism, which is mounted on the frame and is capable of conveying along the x-axis; A vacuum adsorption mechanism includes a main vacuum pipeline fixedly installed on the frame and connected to a vacuum source pipeline, and multiple vacuum adsorption blocks respectively connected to the main vacuum pipeline. The vacuum adsorption blocks can convey wood shavings along the x-axis direction under the drive of the conveying mechanism and provide suction from the bottom surface of the wood shavings. A continuous hot plate, extending along the x-axis, is adapted to provide a heat source from the top surface of the wood shavings. A gap exists between the bottom surface of the continuous hot plate and the top surface of the vacuum adsorption block, such that there is a distance between the bottom surface of the continuous hot plate and the top surface of the wood shavings. The thickness of the wood shavings is 0.03-0.30mm, the initial moisture content is 50-90%, the bottom surface of the wood shavings tends to unfold and flatten under suction, and the top surface of the wood shavings is heated by the heat source at a certain distance from it. As the wood shavings move along the x-axis, the temperature of the heat source gradually decreases, and the distance between the top surface of the wood shavings and the heat source gradually decreases.

2. The drying equipment according to claim 1, characterized in that, The main vacuum pipeline includes a main vacuum tube cavity, a communication port disposed on the bottom or side of the main vacuum tube cavity, and a first communication groove disposed on the top surface of the main vacuum tube cavity. The vacuum adsorption block includes an adsorption block cavity, a second communication groove disposed on the bottom surface of the adsorption block cavity, and an adsorption port disposed on the top surface of the adsorption block cavity. When the vacuum adsorption block moves relative to the main vacuum pipeline, the first communication groove and the second communication groove correspond to each other so that the vacuum adsorption block is connected to the main vacuum pipeline.

3. The drying equipment according to claim 2, characterized in that, The main vacuum pipeline includes multiple sections.

4. The drying equipment according to claim 1, characterized in that, The conveying mechanism includes a pair of narrow belt conveying systems disposed on both sides of the frame, and a pair of fixed blocks are fixedly disposed on both sides of the vacuum adsorption block, with a connecting rod passing through the narrow belt and connecting to the pair of fixed blocks.

5. The drying equipment according to claim 1, characterized in that, The continuous hot plate sequentially includes a first plate segment, a second plate segment, and a third plate segment. The first plate segment and the second plate segment are connected by a first slope segment, and the second plate segment and the third plate segment are connected by a second slope segment. The distances between the first plate segment, the second plate segment, the third plate segment and the top surface of the vacuum adsorption block are 20-40mm, 13-30mm, and 8-15mm, respectively.

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