CN115638615A - Drying equipment for high-vacuum drying processing of wood and drying method thereof - Google Patents
Drying equipment for high-vacuum drying processing of wood and drying method thereof Download PDFInfo
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- CN115638615A CN115638615A CN202211389120.6A CN202211389120A CN115638615A CN 115638615 A CN115638615 A CN 115638615A CN 202211389120 A CN202211389120 A CN 202211389120A CN 115638615 A CN115638615 A CN 115638615A
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- 238000005265 energy consumption Methods 0.000 description 8
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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Abstract
The invention discloses a drying device for high-vacuum drying processing of wood, which comprises: the drying device comprises a drying shell, and a vacuum assembly, a high-frequency drying assembly and a magnetic transmission fan which are connected with the drying shell; vacuumizing the drying cavity, drying the wood stack by using a high-frequency drying assembly by using an electric frequency heating electric field generated after the vacuum degree reaches the drying requirement, and evaporating when the temperature in the drying cavity reaches the water boiling point of the wood under the vacuum condition; meanwhile, the magnetic transmission fan can continuously supply air to the drying cavity, and the moisture on the surface of the wood is guaranteed to separate from the wood. The invention forms a magnetic field through the current of the motor and generates suction force, thereby realizing the suspension of rotating shafts at the inner side and the outer side of the equipment without punching on the shell, realizing the non-contact transmission of torque, further leading the dynamic seal to be static seal, thoroughly solving the defect that the original high-speed fan cannot be completely sealed, and realizing the vacuum drying of the wood with high dehydration vacuum degree, high drying quality, energy conservation, high efficiency and safety.
Description
Technical Field
The invention relates to the technical field of wood drying processing, in particular to drying equipment for high-vacuum drying processing of wood and a drying method thereof.
Background
The rare hardwoods such as the national standard redwood and the like are high in price and high in drying difficulty, and drying defects such as surface cracks, internal cracks, color change and the like can occur at a slightly high drying temperature, so that great resource waste is caused. Therefore, it is usually necessary to produce high vacuum conditions in the drying equipment to lower the boiling point of water in the wood, thereby lowering the temperature of the drying process and reducing quality defects in the drying process.
At present, the equipment for vacuum drying of wood mainly adopts a common fan with a transmission shaft penetrating through a shell to realize gas circulation in a box, and then adopts a mechanical sealing or packing sealing mode and the like to carry out sealing. The drying box of the traditional fan has the defects of difficult installation, poor sealing property, high failure rate, large energy consumption and the like. In addition, high-temperature and high-humidity gas and harmful gas in the drying equipment enter the fan, possibly leak at the motor shaft to pollute the surrounding environment, and easily cause the vacuum degree in the drying process to be insufficient to influence the quality of dried products.
The high-frequency vacuum drying is a drying mode combining high-frequency medium heating and vacuum low-temperature drying, and is particularly suitable for drying hardwood or heavy wood. High-frequency vacuum drying in the prior art has the problem that uneven field intensity leads to drying quality to descend and energy consumption to promote in the high-frequency field.
Therefore, in order to overcome the defects, a high-vacuum drying device for drying high-end rosewood needs to be designed.
Disclosure of Invention
The invention overcomes the defects of the prior art, provides drying equipment for high-vacuum drying processing of wood and a drying method thereof, and aims to solve the problems of insufficient sealing, insufficient vacuum degree and low drying quality of the drying equipment in the prior art.
In order to achieve the purpose, the invention adopts the technical scheme that: drying apparatus for high vacuum drying of wood, comprising: the drying device comprises a drying shell, and a vacuum assembly, a high-frequency drying assembly and a magnetic transmission fan which are connected with the drying shell;
the drying case includes: the drying device comprises a drying cavity and a drying rack arranged in the drying cavity and used for restricting the circumferential direction of wood;
the high-frequency drying assembly includes: a positive plate arranged at one end of the wood pile, a negative plate arranged at the other end of the wood pile, a metal plate arranged between adjacent woods, the copper sheet is connected with the positive plate and the metal polar plates, and the high-frequency generator is connected with the copper sheet; the positive plate and the negative plate are arranged in parallel;
the vacuum assembly is connected with the drying cavity and is used for forming vacuum degree for the drying cavity;
the magnetic transmission fan comprises: a motor and a fan arranged at two sides of the drying shell; the output shaft of the motor is connected with an outer magnet, the outer magnet is connected with an active coupling magnetic plate, a driven shaft of the fan is connected with an inner magnet, the inner magnet is connected with a passive coupling magnetic plate, and isolating sleeves are arranged between the active coupling magnetic plate and the drying shell, and between the passive coupling magnetic plate and the drying shell.
In a preferred embodiment of the present invention, the driven shaft and the driving shaft are on the same straight line.
In a preferred embodiment of the present invention, the bottom of the drying casing is provided with a guide rail for driving the material carrying vehicle to move horizontally.
In a preferred embodiment of the invention, the positive plate and the negative plate are both parallel to the plane of the wood board, the positive plate is fixed at the top of the drying cavity, and the negative plate is arranged on the surface of the material carrying vehicle.
In a preferred embodiment of the invention, the positive plate and the negative plate are arranged at two ends perpendicular to the plane of the wood board, and the positive plate and the negative plate are connected with the drying cavity in a sliding manner and used for changing the distance between the positive plate and the wood board stack; the positive electrode plate and the negative electrode plate are parallel to the length direction of the guide rail.
In a preferred embodiment of the present invention, a compressing unit is disposed in the drying chamber, and the compressing unit compresses the wood in a thickness direction of the wood stack to compress the wood and the metal plate.
In a preferred embodiment of the present invention, the size of the positive electrode plate is larger than that of the negative electrode plate.
In a preferred embodiment of the invention, the two ends of the positive plate are respectively and symmetrically bent at an angle of 30-40 degrees, and the bending length is 15-25% of the width of the positive plate.
In a preferred embodiment of the invention, the drying chamber is internally provided with a conductive heating wire, a dry-wet bulb temperature meter and a moisture content meter.
In a preferred embodiment of the invention, the outer magnet is a permanent magnet outer magnet steel, and the inner magnet is a permanent magnet inner magnet steel.
The invention provides a drying method of drying equipment for high-vacuum drying processing of wood, which comprises the following steps:
s1, wood is stacked and then placed in a drying cavity, wherein a metal polar plate is laid between adjacent wood;
s2, fixing the wood stack through a drying rack, connecting the anode of a high-frequency generator with a metal polar plate and a positive polar plate in a contact manner through a copper sheet, and grounding the cathode and the negative polar plate of the high-frequency generator; a heating capacitor is formed among the positive plate, the metal plate and the negative plate, so that the drying of the wood is realized;
s3, opening a vacuum assembly to discharge air in the drying cavity, ensuring that the vacuum degree in the drying cavity reaches the drying requirement, and continuing to open the high-frequency drying assembly to be combined with the vacuum state after the vacuum degree reaches the drying requirement, so that the temperature in the drying cavity reaches the wood moisture boiling point and evaporation begins; simultaneously, open magnetic drive fan for continuously will dry the intracavity air supply, ensure timber surface moisture separates timber.
In a preferred embodiment of the invention, in the step S1, the wood and the timber are stacked on the material loading vehicle in a dense arrangement mode without leaving gaps, and the height of each layer is 50-100 cm.
In a preferred embodiment of the present invention, four corners of the positive plate have arc transitions.
The invention solves the defects in the background technology, and has the following beneficial effects:
(1) The invention provides drying equipment for high-vacuum drying processing of wood, which is integrated with a vacuum assembly, a high-frequency drying assembly and a magnetic transmission fan; vacuumizing the drying cavity, drying the wood stack by using a high-frequency drying assembly by using an electric frequency heating electric field generated after the vacuum degree reaches the drying requirement, and evaporating when the temperature in the drying cavity reaches the water boiling point of the wood under the vacuum condition; meanwhile, the magnetic transmission fan can continuously supply air in the drying cavity, so that the moisture on the surface of the wood is guaranteed to be separated from the wood, and the vacuum drying of the wood with high dehydration vacuum degree, high drying quality, energy conservation, high efficiency and safety is realized.
(2) The invention utilizes the principle of magnetic coupling of a magnetic transmission device, forms a magnetic field through the current of a motor and generates suction force, thereby realizing the suspension of rotating shafts at the inner side and the outer side of the equipment without punching on a shell, realizing the non-contact transmission of torque, leading the dynamic seal to be static seal, thoroughly solving the defect that the original high-speed fan cannot be completely sealed, ensuring the sealing property of the equipment, hardly influencing the vacuum in the drying equipment, reaching zero leakage, ensuring the operation safety, improving the working efficiency and reducing the energy consumption.
(3) The compressing unit is compacted downwards from the top of the wood pile in the drying process, so that the wood is ensured to be in contact with the high-frequency polar plate to realize uniform drying, and excessive drying shrinkage and warping deformation are prevented in the wood drying process.
(4) The invention provides a structure with adjustable space, which can change the size of an electric frequency heating electric field between a positive plate or a metal pole piece and a negative plate and overcome the problem of uneven drying in the drying process.
(5) In this embodiment, through changing the direction of positive plate, changed the electromagnetic field distribution between the polar plate for the difference in temperature of wood heap center and both sides reduces, makes the field intensity of high frequency field more even, realizes improving ligneous drying efficiency and reduces the energy consumption.
(6) The invention adopts the magnetic transmission fan in the drying process to continuously supply air in the drying cavity, thereby ensuring that the moisture on the surface of the wood is separated from the wood, simultaneously ensuring the extremely high vacuum state because the magnetic transmission fan does not need to open holes on the shell, ensuring that the wood is dried at lower temperature because the boiling point of the moisture in the wood is lower in the vacuum state, and being particularly suitable for drying hardwoods and rare woods.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts;
fig. 1 is a schematic perspective view of a drying apparatus for high vacuum drying of wood in embodiment 1 of the present invention;
fig. 2 is a schematic structural view of a positive electrode plate, a negative electrode plate and wood in example 1 of the present invention;
fig. 3 is a schematic structural view of a magnetic force transmission fan in embodiment 1 of the present invention;
FIG. 4 is a schematic view of the structure at A in FIG. 3 in embodiment 1 of the present invention;
fig. 5 is a schematic structural view of a positive electrode plate, a negative electrode plate and wood in example 3 of the present invention;
in the figure: 1. drying the shell; 11. a guide rail; 12. a material carrying vehicle; 13. a slide rail; 2. a vacuum assembly; 3. a high frequency drying assembly; 31. a positive plate; 32. a negative plate; 4. a magnetic transmission fan; 41. a motor; 42. an output shaft; 43. a fan; 44. an outer magnet; 45. an actively coupled magnetic plate; 46. an inner magnet; 47. a passively coupled magnetic plate; 48. an isolation sleeve; 5. wood; 6. and a pressing unit.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be considered limiting of the scope of the present application. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the invention, the meaning of "a plurality" is two or more unless otherwise specified.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; 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 meaning of the above terms in the present application can be understood by those of ordinary skill in the art through specific situations.
Example 1
As shown in fig. 1, this embodiment provides a schematic perspective structure of a drying apparatus for high vacuum drying of wood. The wood 5 in this embodiment includes but is not limited to rare hardwoods such as national standard redwood, and needs to be surface-leveled, and the thickness of each layer is 50-100 cm.
The drying apparatus includes: a drying shell 1, and a vacuum component 2, a high-frequency drying component 3 and a magnetic transmission fan 4 which are connected with the drying shell 1.
The drying case 1 in this embodiment includes: the stoving chamber to and set up the stoving frame that is used for retraining timber 5 circumference in the stoving chamber. The drying cavity is the inside of the drying shell 1 and comprises a resistance heating wire, a guide rail 11, a dry-wet ball temperature instrument, a water content tester and the like.
In the present embodiment, the bottom of the drying casing 1 is provided with a guide rail 11 for driving the horizontal movement of the material carrying vehicle 12.
As shown in fig. 2, a schematic view of the structures of the positive electrode plate 31, the negative electrode plate 32, and the wood 5 in the present embodiment is shown. The high frequency drying assembly 3 in this embodiment comprises: the wood-made composite board comprises a positive plate 31 arranged at one end of a wood 5 stack, a negative plate 32 arranged at the other end of the wood 5 stack, metal plates arranged between adjacent woods 5, copper sheets connected with the positive plate 31 and a plurality of metal plates, and a high-frequency generator connected with the copper sheets. The positive electrode plate 31 and the negative electrode plate 32 are arranged in parallel. The positive plate 31 and the negative plate 32 are parallel to the plane of the wood board, the positive plate 31 is fixed at the top of the drying cavity, and the negative plate 32 is arranged on the surface of the material carrying vehicle 12.
The high-frequency generator in the embodiment can be used for electrifying, boosting and rectifying a certain voltage power supply, converting the certain voltage power supply into a high-frequency electric field through the electronic tube and the oscillating circuit, outputting the high-frequency electric field to a load, polarizing water molecules in the load instantly under the high frequency, and generating heat through the polarized water molecules moving at a high speed along with the change of the electric field and friction, so that the aim of drying the wood 5 is fulfilled. Different substances have different dielectric loss coefficients and different absorbed electric field energy. Therefore, a certain substance in the electric field can be heated in a targeted manner to improve the efficiency and reduce the energy consumption.
In this embodiment, the anode of the high frequency generator is connected to the metal plate and the positive plate 31 through a copper sheet, and the cathode of the high frequency generator and the negative plate 32 are grounded. By applying voltage to the anode of the high-frequency generator, the positive and negative plates 32 connected with the two ends of the timber 5 material pile form a complete connecting loop to form a high-frequency magnetic field, so that the moisture in the timber 5 is quickly heated under the action of the high-frequency magnetic field to reach a boiling point so as to be evaporated.
The metal plate electrode in the present embodiment corresponds to the positive electrode plate 31, and can generate an electric field for electric frequency heating with the negative electrode plate 32.
The angle of the two ends of the positive plate 31 are respectively and symmetrically bent is 30-40 degrees. The length of the bend is 15% -25% of the width of the positive plate 31. In this embodiment, by changing the direction of the positive plate 31, the electromagnetic field distribution between the positive plates is changed, so that the temperature difference between the center and both sides of the pile of wood 5 is reduced, the field intensity of the high-frequency field is more uniform, and the drying efficiency of the wood 5 is improved and the energy consumption is reduced.
In an alternative embodiment, the four corners of the positive plate 31 have rounded transitions, preventing the concentration of energy at the four corners and preventing local over-drying of the edge positions of the wood 5.
The size of the positive electrode plate 31 is larger than that of the negative electrode plate 32 in this embodiment. Since the size of the electric frequency heating electric field is in direct proportion to the area of the polar plate, the size of the positive plate 31 is at least larger than that of the wood 5, so that high-frequency current generated between the positive plate 31 and the negative plate 32 can act on the peripheral edge of the wood 5, and the periphery and the inside of the wood board can be synchronously dried.
In an alternative embodiment, the shapes of the positive electrode plate 31, the metal electrode plate, and the negative electrode plate 32 are not limited to a rectangular, square, or other planar shape.
In an alternative embodiment, the positive plate 31 of the present embodiment can achieve height adjustment. The driving mode of the height adjustment is not limited to the use of pneumatic, hydraulic or electric push rods.
When the wood 5 and the metal plate are attached, a gap may exist between the wood 5 and the metal plate due to the uneven surface of the wood plate, which may cause a difference in the electric power supplied to the wood 5 by the high-frequency current, and may cause an excessively high temperature at a local position where the metal plate contacts the wood 5, which may cause uneven drying. Therefore, in the process of stacking the wood boards, a dense arrangement mode without leaving pores is required, the wood 5 is selected to be smooth in surface, and the thickness of each layer of the wood board is 50 cm-100 cm.
In this embodiment, the drying chamber is provided with a compressing unit 6, and the compressing unit 6 compresses along the thickness direction of the wood 5 pile for compressing the wood 5 and the metal pole plate. The compressing unit 6 in the embodiment compacts the wood 5 downwards from the top of the pile in the drying process, so that the wood 5 is ensured to be in contact with a high-frequency polar plate to realize uniform drying on one hand, and excessive drying shrinkage and warping deformation are prevented from occurring in the drying process of the wood 5 on the other hand.
In the embodiment, the magnetic transmission fan 4 is arranged on one side of the drying shell 1 and is used for forming a circulating air field for the inner side of the drying cavity.
As shown in fig. 3 and 4, a schematic structural diagram of the magnetic force transmission fan in the present embodiment is shown. The magnetic force transmission fan 4 in this embodiment includes: a motor 41 and a fan 43 provided at both sides of the drying case 1; an output shaft 42 of the motor 41 is connected with an outer magnet 44, the outer magnet 44 is connected with an active coupling magnetic plate 45, a driven shaft of the fan 43 is connected with an inner magnet 46, the inner magnet 46 is connected with a passive coupling magnetic plate 47, and an isolation sleeve 48 is arranged between the active coupling magnetic plate 45 and the passive coupling magnetic plate 47 and the drying shell 1. The driven shaft and the driving shaft are on the same straight line. In this embodiment, the outer magnet 44 is a permanent magnet outer magnet steel and the inner magnet 46 is a permanent magnet inner magnet steel.
In the drying process, adopt magnetic drive fan 4, continuously supply air with the drying chamber intracavity, ensure 5 surperficial moisture in timber and separate timber 5, simultaneously because magnetic drive fan 4 need not trompil on the casing and guaranteed high vacuum state, and the boiling point vacuum state of the moisture in timber 5 is lower down, can guarantee that timber 5 is dried under the lower temperature, is particularly suitable for hardwood and rare timber 5's drying.
The magnetic coupling principle of the magnetic transmission device is adopted in the embodiment, the current of the motor 41 forms a magnetic field and generates suction, so that the suspension of rotating shafts on the inner side and the outer side of the equipment can be realized without punching on the shell, the torque contactless transmission is realized, the dynamic seal is static seal, the defects of difficult installation, poor sealing property, high failure rate, high energy consumption and the like of the original high-speed fan are thoroughly overcome, the sealing property of the equipment is ensured, the vacuum in the drying equipment is hardly influenced, zero leakage can be achieved, the operation safety is ensured, the work efficiency is improved, and the energy consumption is reduced.
In the embodiment, the wood 5 inspection plate and the experimental plate are selected and punched, and the temperature probe and the moisture content probe of the side wall of the drying rack are respectively inserted for dynamically monitoring the moisture content and the temperature in the drying process. In an alternative embodiment, the surface of the drying casing 1 is provided with a control panel, and the control panel is connected with the vacuum assembly 2, the high-frequency drying assembly 3 and the magnetic force transmission fan 4 through a control unit. The control panel displays the temperature difference between the central measuring point of the wood 5 inspection board and the central measuring point of the experimental board and the temperature of the measuring points in the length direction, the width direction and the thickness direction, a time curve of the temperature and the like, so that an operator can adjust the power of the high-frequency generator.
The embodiment also provides a drying method for high-vacuum drying processing of wood 5, which is based on the drying equipment and comprises the following steps:
s1, stacking the wood 5 and the wood 5 on a material carrying vehicle 12 in a dense arrangement mode without gaps, wherein the height of each layer is 50-100 cm, and a metal polar plate is laid between every two adjacent woods 5;
s2, pushing the material carrying trolley 12 into a drying rack through a guide rail 11 and fixing the material carrying trolley so that the positive plate 31 and the negative plate 32 are opposite, connecting the anode of the high-frequency generator with the metal plate and the positive plate 31 in a contact manner through a copper sheet, and grounding the cathode of the high-frequency generator and the negative plate 32; a heating capacitor is formed between the positive plate 31 and the metal plate and the negative plate 32, so that the wood 5 is dried;
s3, opening the vacuum assembly 2 to discharge air in the drying cavity, ensuring that the vacuum degree in the drying cavity reaches the drying requirement, and continuing to open the high-frequency drying assembly 3 to be combined with the vacuum state after the vacuum degree reaches the drying requirement, so that the temperature in the drying cavity reaches the water boiling point of the wood 5 and evaporation begins; simultaneously, open magnetic drive fan 4 for continuously will dry the intracavity air supply, ensure 5 surface moisture of timber and separate timber 5.
Example 2
The embodiment is improved on the basis of embodiment 1, a metal pole piece is arranged between adjacent wood 5, and as the size of the electrical frequency heating electric field is inversely proportional to the distance between the positive plate 31 or the metal pole piece and the negative plate 32, the electrical frequency heating electric field is gradually reduced along with the increase of the distance. The size of the metal pole piece in the embodiment is reduced from top to bottom in sequence, so that the size of the electric frequency heating electric field is reduced from top to bottom in sequence, and the drying speed of each layer of wood 5 is basically consistent.
Example 3
This embodiment is an improvement over embodiment 1 or embodiment 2. As shown in fig. 5, the arrangement of the wood 5 piles in the present embodiment is: the plane of the timber 5 is arranged perpendicular to the surface of the carriage 12. And a metal polar plate is laid between the adjacent wood 5.
The present embodiment is provided with a pair of symmetrically arranged slide rails 13 on both sides of the guide rail 11, the slide rails 13 are arranged perpendicular to the guide rail 11, the slide rails 13 are used for mounting the positive electrode plates 31 and the negative electrode plates 32, and the positive electrode plates 31 and the negative electrode plates 32 are arranged in a positive-facing manner. The positive plates 31 and the negative plates 32 slide on the slide rails 13, the positive plates 31 and the negative plates 32 are parallel to the length direction of the guide rails 11, the positive plates 31 and the negative plates 32 are arranged at two ends perpendicular to the plane of the wood boards, and the positive plates 31 and the negative plates 32 are connected with the drying cavity in a sliding mode and used for changing the distance between the positive plates 31 and the wood board stack.
The relative movement of the positive and negative plates 31 and 32 in this embodiment may be driven by a screw slider. Taking the positive plate 31 as an example, the positive plate 31 is disposed on the support, the positive plate 31 and the support may be connected by a screw, a screw is disposed in the middle of the slide rail 13, the screw is disposed on the screw seat, the screw is connected to the support through a connecting block, the connecting block is connected to the screw by a screw thread, and the connecting block is fixedly connected to the bottom of the support. Through the normal position rotation of threaded rod on the screw thread seat for the connecting block relative motion for the threaded rod, and the motion of connecting block can drive the support and slide on slide rail 13. In this embodiment, the positive electrode plate 31 and the negative electrode plate 32 move in the same manner, and are not described again.
The compressing unit 6 in this embodiment compresses along the thickness direction of the wood 5 stack for compressing the wood 5 and the metal pole plate, ensuring the wood 5 to contact with the high-frequency pole plate, realizing uniform drying, and preventing excessive drying shrinkage and warping deformation from occurring in the drying process of the wood 5.
Because the size of the electrical frequency heating electric field is inversely proportional to the distance between the positive plate 31 or the metal pole piece and the negative plate 32, the distance between different metal pole pieces and the distance between the positive plate 31 and the negative plate 32 and the distance between the positive plate 31 or the metal pole piece and the negative plate 32 can be realized only by controlling the sliding distance between the positive plate 31 and the negative plate 32 on the slide rail 13, and then the size of the electrical frequency heating electric field between the positive plate 31 or the metal pole piece and the negative plate 32 is changed.
The embodiment provides a drying method of drying equipment for high-vacuum drying processing of wood 5, which comprises the following steps:
s1, stacking the woods 5 and the woods 5 on a material carrying vehicle 12 in a dense arrangement mode without gaps, wherein the height of each layer is 50-100 cm, metal polar plates are laid between every two adjacent woods 5, and the planes of the woods 5 are vertical to the surface of the material carrying vehicle 12;
s2, fixing the wood 5 stack through a drying rack, connecting the anode of a high-frequency generator with a metal pole plate and a positive pole plate 31 in a contact manner through a copper sheet, and grounding the cathode of the high-frequency generator and a negative pole plate 32; a heating capacitor is formed between the positive plate 31 and the metal plate and the negative plate 32, so that the wood 5 is dried;
s3, opening the vacuum component 2 to discharge air in the drying cavity, ensuring that the vacuum degree in the drying cavity meets the drying requirement, and continuing to open the high-frequency drying component 3 to be combined with the vacuum state after the vacuum degree meets the drying requirement, so that the temperature in the drying cavity reaches the water boiling point of the wood 5 and evaporation begins; meanwhile, the magnetic transmission fan 4 is started to continuously supply air into the drying cavity, so that the moisture on the surface of the wood 5 is ensured to be separated from the wood 5;
s4, 5 inspection boards of timber and laboratory panel punch, insert the temperature probe of box lateral wall, moisture content probe respectively for moisture content and temperature dynamic monitoring in the drying process, when the drying of detection timber 5 is inhomogeneous, through the position of adjusting positive plate 31 and negative plate 32 on 11 both sides slide rails 13 of guide rail, change the size of electric frequency heating electric field.
In light of the foregoing description of the preferred embodiment of the present invention, it is to be understood that various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (10)
1. Drying equipment for high-vacuum drying processing of wood is characterized by comprising the following components: the drying device comprises a drying shell, and a vacuum assembly, a high-frequency drying assembly and a magnetic transmission fan which are connected with the drying shell;
the drying case includes: the drying device comprises a drying cavity and a drying rack arranged in the drying cavity and used for restricting the circumferential direction of wood;
the high-frequency drying assembly includes: a positive plate arranged at one end of the wood pile, a negative plate arranged at the other end of the wood pile, a metal plate arranged between adjacent woods, the copper sheet is connected with the positive plate and the metal polar plates, and the high-frequency generator is connected with the copper sheet; the positive plate and the negative plate are arranged in parallel;
the vacuum assembly is connected with the drying cavity and is used for forming vacuum degree for the drying cavity;
the magnetic force transmission fan comprises: the motor and the fan are arranged on two sides of the drying shell; the output shaft of the motor is connected with an outer magnet, the outer magnet is connected with an active coupling magnetic plate, a driven shaft of the fan is connected with an inner magnet, the inner magnet is connected with a passive coupling magnetic plate, and isolating sleeves are arranged between the active coupling magnetic plate and the drying shell, and between the passive coupling magnetic plate and the drying shell.
2. A drying apparatus for high vacuum drying process of wood according to claim 1, wherein: the driven shaft and the driving shaft are on the same straight line.
3. A drying apparatus for high vacuum drying process of wood according to claim 2, characterized in that: and the bottom of the drying shell is provided with a guide rail for driving the material carrying vehicle to horizontally move.
4. A drying apparatus for high vacuum drying process of wood according to claim 3, wherein: the positive plate and the negative plate are parallel to the plane of the wood board, the positive plate is fixed to the top of the drying cavity, and the negative plate is arranged on the surface of the material carrying vehicle.
5. A drying apparatus for high vacuum drying process of wood according to claim 3, wherein: the positive plate and the negative plate are arranged at two ends perpendicular to the plane of the wood board, and are in sliding connection with the drying cavity and used for changing the distance between the positive plate and the wood board stack; the positive electrode plate and the negative electrode plate are parallel to the length direction of the guide rail.
6. Drying apparatus for high vacuum drying of wood according to claim 4 or 5, characterised in that: and a pressing unit is arranged in the drying cavity, and the pressing unit is compressed along the thickness direction of the wood pile and is used for pressing the wood and the metal polar plate.
7. Drying apparatus for high vacuum drying of wood according to claim 4 or 5, characterised in that: the size of the positive plate is larger than that of the negative plate.
8. A drying apparatus for high vacuum drying process of wood according to claim 1, wherein: the two ends of the positive plate are respectively bent symmetrically by an angle of 30-40 degrees.
9. A drying apparatus for high vacuum drying process of wood according to claim 1, wherein: and a conductive heating wire, a dry-wet bulb temperature instrument and a moisture content tester are arranged in the drying cavity.
10. A drying method of drying equipment for high-vacuum drying processing of wood is characterized by comprising the following steps:
s1, wood is stacked and then placed in a drying cavity, wherein a metal polar plate is laid between adjacent wood;
s2, fixing the wood stack through a drying rack, connecting the anode of a high-frequency generator with a metal polar plate and a positive polar plate in a contact manner through a copper sheet, and grounding the cathode and the negative polar plate of the high-frequency generator; a heating capacitor is formed among the positive plate, the metal plate and the negative plate, so that the drying of the wood is realized;
s3, opening a vacuum assembly to discharge air in the drying cavity, ensuring that the vacuum degree in the drying cavity reaches the drying requirement, and continuing to open the high-frequency drying assembly to be combined with the vacuum state after the vacuum degree reaches the drying requirement, so that the temperature in the drying cavity reaches the wood moisture boiling point and evaporation begins; simultaneously, open magnetic drive fan for continuously will dry the intracavity air supply, ensure timber surface moisture separates timber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211389120.6A CN115638615A (en) | 2022-11-08 | 2022-11-08 | Drying equipment for high-vacuum drying processing of wood and drying method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211389120.6A CN115638615A (en) | 2022-11-08 | 2022-11-08 | Drying equipment for high-vacuum drying processing of wood and drying method thereof |
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| CN115638615A true CN115638615A (en) | 2023-01-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202211389120.6A Pending CN115638615A (en) | 2022-11-08 | 2022-11-08 | Drying equipment for high-vacuum drying processing of wood and drying method thereof |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ATA233788A (en) * | 1988-09-22 | 1989-11-15 | Immuno Ag | DEVICE FOR THE STORAGE AND RECONSTITUTION OF LYOPHILIZED MEDICINAL PRODUCTS |
| CN2104419U (en) * | 1991-06-22 | 1992-05-13 | 梁穗玲 | Electric-field type timber desiccator |
| BRPI0704907A2 (en) * | 2007-05-11 | 2009-01-06 | Contreras Lionel Fernel Gamarra | Suitable method for drying magnetic fluids |
| CN204921412U (en) * | 2015-08-19 | 2015-12-30 | 惠州市欧瑞动力自动化科技有限公司 | Magnetic force actuation fan and enclosed cell drying equipment |
| CN212778238U (en) * | 2020-08-26 | 2021-03-23 | 东北林业大学 | Wood drying equipment |
| CN213811453U (en) * | 2020-09-21 | 2021-07-27 | 东阳市尚德电器机械有限公司 | Wood combined process drying integrated equipment |
| CN215571952U (en) * | 2021-08-20 | 2022-01-18 | 石家庄多田机械有限公司 | Continuous high-frequency heating drying equipment |
-
2022
- 2022-11-08 CN CN202211389120.6A patent/CN115638615A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ATA233788A (en) * | 1988-09-22 | 1989-11-15 | Immuno Ag | DEVICE FOR THE STORAGE AND RECONSTITUTION OF LYOPHILIZED MEDICINAL PRODUCTS |
| CN2104419U (en) * | 1991-06-22 | 1992-05-13 | 梁穗玲 | Electric-field type timber desiccator |
| BRPI0704907A2 (en) * | 2007-05-11 | 2009-01-06 | Contreras Lionel Fernel Gamarra | Suitable method for drying magnetic fluids |
| CN204921412U (en) * | 2015-08-19 | 2015-12-30 | 惠州市欧瑞动力自动化科技有限公司 | Magnetic force actuation fan and enclosed cell drying equipment |
| CN212778238U (en) * | 2020-08-26 | 2021-03-23 | 东北林业大学 | Wood drying equipment |
| CN213811453U (en) * | 2020-09-21 | 2021-07-27 | 东阳市尚德电器机械有限公司 | Wood combined process drying integrated equipment |
| CN215571952U (en) * | 2021-08-20 | 2022-01-18 | 石家庄多田机械有限公司 | Continuous high-frequency heating drying equipment |
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