A veneer drying system

Abstract

The present invention discloses a single board drying system, which includes: a heat exchange device, which utilizes a heat source to heat cold drying gas; an air intake chamber, which utilizes an air induction device to introduce the drying gas heated by the heat exchange device from the heat exchange device into a plate frame group; a plate frame group, which is formed by N single boards and N+1 spacers stacked at intervals, and a gap ventilation duct is formed between two adjacent single boards through the spacers, and the drying gas is passed into the gap ventilation duct to dry the single board; an exhaust chamber, which discharges the hot and humid drying gas passed from the plate frame group. The single board drying system of the present invention can effectively achieve the advantages of uniform air flow, small wind resistance, high drying efficiency, low energy consumption, and no deformation during the drying process, etc. Compared with traditional single board drying equipment, its production volume under the same volume can be increased by more than 100 times.

Description

Technical Field

[0001] The invention relates to the technical field of wood drying, in particular to a veneer drying system. Background Art

[0002] Multilayer boards have many advantages such as small deformation, high structural strength, and high environmental protection level. The production of multilayer boards has low requirements for raw materials, sufficient supply of raw materials, and low production costs. Therefore, they enjoy a large market share in domestic wooden panels.

[0003] Veneer drying is an important process for making multi-layer boards and templates. Veneer is a thin plate with a thickness of 1.5-2.2mm peeled from wood. The moisture content of veneer is very high, usually between 30-80%. The moisture content of some wood is even as high as 80% or more, so it must be dried before pressing. However, due to the high moisture content of veneer, it is difficult to dry and is prone to deformation after being heated. The faster the drying speed, the more serious the deformation. At present, the more common veneer drying method on the market is to press the veneer up and down through a tunnel-type roller, and then blow hot air from the top and bottom to the veneer. The roller conveys the veneer forward until it is sent out from the other end of the tunnel after drying. The main disadvantages of this drying method are: large footprint and low drying efficiency.

[0004] The applicant has tried to put the veneers upright, separate each veneer with a screen to maintain ventilation, and then blow hot strong air to dry them. Although the volume can be greatly reduced, the crisscrossing of the longitude and latitude of the screen greatly affects the air volume, resulting in poor drying effect due to excessive resistance. However, the screen has a certain effect on fixing the veneer without deformation. Therefore, most of them still use the method of laying the veneer flat up and down to blow against each other for drying, which not only occupies 100 times more space, but also has high energy consumption, and the thermal efficiency is only about 15%, which wastes energy seriously and has low production speed. Summary of the invention

[0005] In order to solve the above technical problems, the purpose of the present invention is to provide a single board drying system. By improving the structure of the screen, a spacing device is designed, and the single board is upright and relatively fixed through the above spacing device, which can effectively achieve the advantages of uniform air flow, small wind resistance, high drying efficiency, low energy consumption, and no deformation during the drying process.

[0006] In view of the above problems, a technical solution adopted by the present invention is to provide a veneer drying system, characterized in that the veneer drying system comprises:

[0007] A heat exchange device that utilizes a heat source to heat the cold drying gas;

[0008] An air inlet chamber, which uses an air induction device to introduce the drying gas heated by the heat exchange device into the plate frame assembly from the heat exchange device;

[0009] A plate-frame group is formed by stacking N single plates and N+1 spacers, wherein a gap ventilation channel is formed between two adjacent single plates through the spacers, and the drying gas is passed through the gap ventilation channel to dry the single plates;

[0010] The exhaust chamber discharges the hot and humid drying gas from the plate frame assembly. The integral plate frame assembly forms a slit ventilation channel. The stacked single board assembly is placed vertically or horizontally between the air inlet chamber and the exhaust chamber. The hot air heated by the heat exchanger passes through the air inlet chamber, the plate frame assembly, and then enters the exhaust chamber to dry the single board. The plate frame assembly can effectively prevent the single board from deforming during the drying process, and can greatly improve production efficiency. One clamping can achieve the drying of N single boards.

[0011] Furthermore, the heat source of the heat exchange device is the hot and humid drying gas discharged from the exhaust chamber. Through the above arrangement, the drying gas is circulated and utilized in a gradient manner, which greatly reduces the energy consumption of the system and the production cost.

[0012] Furthermore, the spacer device includes a plurality of high temperature resistant spacers arranged at intervals along the airflow direction, the spacers are in close contact with the veneer, an airflow channel is formed between two adjacent spacers, and the sandwich air passage is composed of a plurality of the airflow channels. The spacers are effectively compacted on the vertical and horizontal grains on both sides of the veneer, and as long as the density is appropriate, the deformation of the wood is controlled to the maximum extent.

[0013] Furthermore, the spacer includes a filament or strip body arranged in a serpentine, S-shaped or zigzag shape, and the thickness of the spacer is equal to the thickness of the single board + 0.8 to 3.5 mm. Through the above arrangement, the cross-sectional area of ​​the slit ventilation channel is larger than the cross-sectional area of ​​the single board, thereby ensuring that a sufficient amount of hot air can pass through the slit ventilation channel, ensuring the drying efficiency; at the same time, the spacer with a curved structure can increase the residence time of the drying gas in the plate frame group, further improving the drying efficiency.

[0014] Furthermore, two ends of the spacer support transverse frames, two ends of the transverse frames support longitudinal frames, and the interiors of the transverse frames and the longitudinal frames form a rectangular space for accommodating the single board.

[0015] Furthermore, two adjacent spacers are connected by the longitudinal frame, and a plurality of the longitudinal frames are stacked to form a sealed side wall of the slit ventilation channel. The sealed side wall allows the hot drying gas to flow in a closed manner within the plate frame assembly, effectively passing through the heated single plate without overflowing.

[0016] Furthermore, the spacer comprises a high temperature resistant metal wire, and the diameter of the metal wire = the thickness of the single board + 1.5 to 2.8 mm.

[0017] Furthermore, two adjacent longitudinal frames are sealed by a silicone strip.

[0018] Furthermore, the distance between two adjacent spacers is set to 5-50 mm to ensure a suitable density of the spacers, thereby controlling the deformation of the single board to the greatest extent.

[0019] The beneficial effects of the present invention are: the volume of the equipment is significantly reduced, saving a large amount of equipment and material investment, which is 1 / 100 of the traditional drying equipment, or 100 times the production volume of the same volume; and this combination is not easy to cause single board deformation, because the air intake and exhaust are orderly, and the hot air can be recycled or used in a gradient, thereby avoiding the problem that the flat-type drying equipment is very large in size, the heat dissipation is too large, and the waste hot air is difficult to recover or use in a gradient. In addition, the equipment is small and the power energy consumption is low. Automation and orderly recycling of hot air can be achieved through the continuous entry and exit of the single board frame group. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a structural schematic diagram of a single board drying system according to an embodiment of the present invention;

[0021] Figure 2 is a schematic structural diagram of a single spacer device in an embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of a structure in which a single spacer device and a single board are stacked in an embodiment of the present invention;

[0023] Figure 4 2 is a schematic diagram of a structure in which two spacers and two single boards are stacked in an embodiment of the present invention;

[0024] Figure 5 Schematic diagram of the structure of the plate frame assembly in an embodiment of the present invention.

[0025] Description of reference numerals:

[0026] a Plate and frame set

[0027] b Exhaust chamber

[0028] c. Heat exchanger

[0029] d Intake chamber

[0030] 1 Airflow channel

[0031] 2 Metal Wire

[0032] 3 Horizontal frame

[0033] 4 Vertical frame

[0034] 5 Single board

[0035] 6 Sidewall

[0036] A Drying gas DETAILED DESCRIPTION

[0037] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more specific definition of the protection scope of the present invention. The veneer drying system of this embodiment is a device for drying veneer sheets peeled off from wood.

[0038] See also Figure 1 The veneer drying system of this embodiment comprises: a plate frame group a, which is composed of a plurality of veneers 5 and spacers stacked at intervals, a spacer is arranged between two adjacent veneers 5, a gap ventilation duct is formed between the veneers 5 and the spacer, and the drying gas A passes through the gap ventilation duct to dry the veneers 5; an exhaust chamber b, which is used to lead the drying gas A containing humidity out of the plate frame group a; a heat exchanger b, which uses the humid drying gas A passed from the exhaust chamber b to heat the cold drying gas A; an air inlet chamber d, which uses a blower to blow the heated drying gas A into the air inlet chamber d; and a heat exchanger b, which uses the humid drying gas A passed from the exhaust chamber b to heat the cold drying gas A. The dried gas A is sent into the plate frame group a. The stacked single plate group with slit ventilation formed by the entire plate frame group a is placed vertically or horizontally between the above-mentioned air inlet chamber d and the exhaust chamber d. The hot air of the drying gas A heated by the heat exchanger b is sent into the air inlet chamber d through the plate frame group a and then into the exhaust chamber b (the circulation direction of the drying gas A can be seen in the arrow direction in the figure). The cycle continues, and the excess moist and hot air can be partially discharged or sent to other plate frame groups for reuse. This can not only ensure that the single plate is not deformed, but also greatly save the equipment area, increase production, and facilitate the docking of energy-saving equipment.

[0039] See also Figure 2 It is a structural schematic diagram of a single spacing device, comprising: a plurality of high-temperature resistant metal wires 2 arranged at intervals along the airflow direction of the drying gas A, the metal wires 2 are in a serpentine structure, the two ends of the metal wires 2 support a transverse frame 2 of the metal structure, and the two ends of the transverse frame 2 support a longitudinal frame 4.

[0040] See also Figures 2 to 4 When multiple spacer devices are superimposed, the serpentine metal wire 2 is tightly squeezed against the single board 5, and a serpentine airflow channel 1 is formed between two adjacent metal wires 2. The multiple airflow channels 1 form a gap ventilation duct for the drying gas A to pass through.

[0041] The thickness of the longitudinal frame 4 can be compressed, for example, by attaching silicone strips on both sides of the longitudinal frame 4. When multiple spacers are stacked together, the single board 5 and the metal wire 2 can be tightly pressed and contacted, thereby forming a slit ventilation channel between two adjacent single boards 5, and the longitudinal frames 4 squeezed together form the above-mentioned slit ventilation channel sealing side walls 6 (see Figure 4 ), thereby ensuring that the drying gas completely enters the above-mentioned slit ventilation duct after passing through the air inlet chamber d, and dries multiple single boards 5 at the same time.

[0042] The lateral frame 3 and the longitudinal frame 4 form a space for accommodating the single board 5. Since the serpentine metal wire 2 forms a lot of serpentine airflow channels 1, the serpentine airflow channels 1 on both sides of each single board 5 form a large number of combined channels through which the drying gas A can pass evenly, and the cross-sectional area through which the drying gas A can pass is the sum of the overall cross-sectional area minus the cross-sectional area of ​​the single board 5. The thickness of the single board 5 is usually between 1.5-2.2 mm, and the diameter of the metal wire 2 of this embodiment is designed to be between 3.0-5.0 mm. Therefore, the cross-sectional area of ​​the combined channel passing through is larger than the cross-sectional area of ​​the single board 5, so a large amount of hot air of the drying gas A can pass through the channel, thereby effectively drying the moisture in the single board 5. At the same time, the airflow channel 1 with a serpentine structure can increase the residence time of the drying gas A inside the plate frame group a without generating too much wind resistance, thereby improving the drying efficiency.

[0043] In addition, the serpentine wire 2 is effectively pressed against the horizontal and vertical grains of the veneer 5. As long as the density is appropriate, the deformation of the veneer 5 is controlled to the maximum extent.

[0044] In another embodiment of the present invention, the metal wire 2 may also be designed as an S-shaped, zigzag-shaped or other flow-disturbing structure, or the metal wire 2 may also be changed to a strip structure without affecting the realization of the technical effect of the present invention.

[0045] Compared with the tunnel-type roller drying structure of the prior art, the single board drying system of the present invention has a greatly reduced equipment volume, which can save a lot of equipment and material investment costs, and at the same time can greatly improve production efficiency. Multiple single boards 5 can be dried in one clamping. The applicant's experiments have proved that under the same volume, the production volume of the present invention can be more than 100 times that of traditional tunnel-type roller drying equipment; in addition, the plate and frame combination structure of the present invention can effectively avoid the deformation of the single board 5, and the hot air of the drying gas A can be circulated or gradient-applied, thereby effectively reducing the energy consumption of the system, improving the heat utilization efficiency, and reducing costs; at the same time, the present invention also has the advantages of simple structure, easy installation, simple process, etc., and can be suitable for industrial promotion and application.

[0046] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A veneer drying system, characterized in that: The veneer drying system comprises: A heat exchange device that utilizes a heat source to heat the cold drying gas; An air inlet chamber, which uses an air induction device to introduce the drying gas heated by the heat exchange device into the plate frame assembly from the heat exchange device; A plate frame group is formed by stacking N single plates and N+1 spacers at intervals, wherein a gap ventilation channel is formed between two adjacent single plates through the spacers, and the drying gas is passed into the gap ventilation channel to dry the single plates; when multiple spacers are stacked together, the single plates and the metal wires are closely squeezed and contacted, thereby forming a gap ventilation channel between two adjacent single plates; An exhaust chamber for exhausting the hot and humid drying gas from the plate and frame assembly; The spacer device comprises a plurality of high temperature resistant spacers arranged at intervals along the airflow direction, the spacers are in close contact with the single board, an airflow channel is formed between two adjacent spacers, and the slotted ventilation channel is composed of a plurality of the airflow channels; The spacer includes a filament or strip body arranged in an S-shape or a zigzag shape, and the thickness of the spacer is equal to the thickness of the single board + 0.8 to 3.5 mm; both ends of the spacer support transverse frames, and both ends of the transverse frames support longitudinal frames, and the interior of the transverse frames and the longitudinal frames form a rectangular space for accommodating the single board; two adjacent spacer devices are connected by the longitudinal frames, and a plurality of the longitudinal frames are superimposed to form a sealed side wall of the gap ventilation duct; the spacer includes a high-temperature resistant metal wire, and the diameter of the metal wire is equal to the thickness of the single board + 1.5 to 2.8 mm; two adjacent longitudinal frames are sealed by a silicone strip.

2. A veneer drying system according to claim 1, characterized in that: The heat source of the heat exchange device is the hot and humid drying gas discharged from the exhaust chamber.

3. A veneer drying system according to claim 1, characterized in that: The distance between two adjacent spacers is set to 5-50 mm.

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