Opposite-pressing continuous dryer for wood veneers

Abstract

The utility model provides a counter-pressing continuous dryer for wood veneers. The counter-pressing continuous dryer comprises a drying box and a counter-pressing conveying device. The opposite-pressing type conveying device comprises a plurality of layers of conveying devices, each conveying device comprises a driving chain wheel shaft and a driven chain wheel shaft, driving chain wheels are fixedly installed at the two ends of each driving chain wheel shaft respectively, driven chain wheels are fixedly installed at the two ends of each driven chain wheel shaft respectively, and chains are installed between the driving chain wheels and the driven chain wheels. A plurality of supporting cross rods are fixedly installed between the chains, an annular breathable flexible mesh belt is fixedly installed outside the supporting cross rods, a plurality of breathable holes are formed in the breathable flexible mesh belt, supporting rods used for supporting the chains are installed below the chains, and a plurality of protrusions at intervals are fixed to the upper surfaces of the supporting rods. And a plurality of first ventilation through holes leading to the ventilation flexible mesh belt are formed in the supporting cross rod. The continuous drying device can realize continuous drying, and is high in production efficiency, high in productivity, low in failure rate, uniform in heating and good in dried plate shape.

Description

Technical Field

[0001] This utility model relates to drying equipment, and more particularly to a continuous pressure dryer for wood veneer. Background Technology

[0002] Wood veneer is made by cutting trees into segments and then rotary-slicing them into thin strips of a specified thickness along the circular surface of the segments. Wood veneer is generally quite thin, typically between 0.5 and 3.2 mm thick. Freshly rotary-cut wood veneer is quite damp and needs to be dried.

[0003] For example, the utility model patent with publication number CN 114485122A discloses a tunnel-type wood veneer drying production line. During the drying process, the wood veneers need to be inserted one by one into the clamps on the chain and then sent to the dryer for drying. This method is inefficient and has low production capacity.

[0004] Some drying equipment uses symmetrically arranged rollers to convey wood veneer into the dryer. On the one hand, the rollers are in close contact with the surface of the wood veneer, affecting the drying process. On the other hand, the rollers are rigid and can easily damage the wood veneer. Furthermore, wood veneer expands and contracts during heating, while the rigid rollers cannot deform, so using rollers can also damage the wood veneer. Utility Model Content

[0005] To address the problems in the background technology, this utility model proposes a high-efficiency, low-energy-consumption continuous pressure dryer for wood veneer, which has high production efficiency and low energy consumption.

[0006] The technical solution of this utility model is implemented as follows:

[0007] A continuous pressure dryer for wood veneer includes a drying chamber and a pressure conveying device. The drying chamber is divided into several sub-drying chambers along the feeding direction. Each sub-drying chamber is further divided into a lower drying chamber and an upper circulating air chamber. A circulating fan blowing horizontally from one end of the lower drying chamber to the other end is installed. A heat exchanger is installed at the outlet of the circulating fan. Circulating air vents leading to the upper circulating air chamber are opened at both ends of the lower drying chamber. The lower drying chambers of the sub-drying chambers are connected along the feeding direction. The pressure conveying device passes horizontally through the lower drying chamber of the drying chamber along the feeding direction. The pressure conveying device includes several layers of conveying devices from top to bottom. Each conveying device includes a drive sprocket shaft and a driven sprocket respectively located at the feed end and discharge end of the drying chamber. The shaft has a drive sprocket shaft with drive sprockets fixedly installed at both ends, and a driven sprocket shaft with driven sprockets fixedly installed at both ends. A chain is installed between the drive sprockets and the driven sprockets. Several support crossbars are fixedly installed between the chains. An annular breathable flexible mesh belt is fixedly installed outside the support crossbars. Several air holes are opened on the breathable flexible mesh belt. A feeding channel is formed between the lower surface of the upper layer of breathable flexible mesh belt and the upper surface of the lower layer of breathable flexible mesh belt. A support rod for supporting the chain is installed below the chain. The support rod is fixed on the drying box. Several spaced protrusions are fixed on the upper surface of the support rod at the bottom of the breathable flexible mesh belt. Several first air holes leading to the breathable flexible mesh belt are opened on the support crossbars.

[0008] The inner side of the chain is rotatably connected with several limiting devices at intervals. The limiting devices include a vertical rotating shaft, the upper end of which is fixed on the inner side of the chain. A bearing or roller is connected to the rotating shaft, and the circumferential side of the bearing or roller contacts the inner side of the support rod.

[0009] Preferably, one end of the drive sprocket shaft is connected to a drive device.

[0010] Preferably, the drive device includes a geared motor, and the output shaft of the geared motor is connected to the end of the drive sprocket shaft via a coupling.

[0011] Preferably, the support rod has several horizontal ventilation holes, which are parallel to the support crossbar.

[0012] Preferably, the protrusion is an arc-shaped protrusion.

[0013] Preferably, the breathable flexible mesh belt is fixed to the support crossbar by screws, and both ends of the support crossbar are provided with screw holes that cooperate with the screws.

[0014] Preferably, the chains of the upper and lower conveying devices are arranged horizontally and staggered, and the circulating fans in the adjacent lower drying chambers are arranged alternately.

[0015] Preferably, an L-shaped chain plate is installed on the inner side of the chain, and a second horizontal ventilation opening is provided on the L-shaped chain plate. The two ends of the support crossbar are fixed to the L-shaped chain plate by second screws. A connecting plate is fixed to the top of the rotating shaft, and the connecting plate is fixed to the bottom of the L-shaped chain plate. A limit end is fixedly connected to the bottom of the rotating shaft.

[0016] Preferably, the feeding end of the drying box is equipped with a feeding auxiliary device, which includes side plates symmetrically installed on both sides of the drying box, and a number of auxiliary guide rollers rotatably connected between the side plates.

[0017] Preferably, the upper surface of the upper circulating air chamber is provided with a dehumidification port, and a dehumidification port control door for dehumidification is installed on the dehumidification port; the side of the lower drying chamber is provided with an air inlet that cooperates with the circulating fan, and an air inlet control door for controlling the air intake is installed on the air inlet; the inner surface of the drying box is fixed with a heat insulation layer, and the heat exchanger includes a heat medium inlet and an outlet.

[0018] The beneficial effects of this utility model are:

[0019] 1. This utility model does not require additional specific feeding equipment. The wood veneer is directly fed into the drying box for drying through a pressure conveyor device, which can realize continuous drying, high production efficiency and high capacity.

[0020] 2. The pressure conveying device of this utility model uses a breathable flexible mesh belt to press the wood veneer from the top and bottom for drying, which can make the dried wood veneer form a relatively flat board surface, unlike traditional equipment which will cause large deformation after drying and loss of moisture, resulting in a very uneven board surface.

[0021] 3. The breathable flexible mesh belt of this utility model has good air permeability. Hot air can dry the wood veneer from all directions through the breathable flexible mesh belt. The drying is uniform and effective, with high drying efficiency. In addition, it has good softness and better protects the wood veneer from being crushed.

[0022] 4. Several first ventilation holes leading to the breathable flexible mesh belt are opened on the support crossbar, and several horizontal ventilation holes are opened on the support rod. This can reduce the obstruction of hot air by the support crossbar and support rod, so that the hot air can be blown to the upper and lower surfaces and both sides of the wood veneer in the largest possible way.

[0023] 5. The upper surface of the support rod is fixed with several spaced protrusions. The protrusions can increase the distance between the upper and lower chains at this position, thereby increasing the distance between the upper and lower breathable flexible mesh belts at this position, increasing the feeding channel at this position, giving the wood veneer more space, so that the wood veneer is not always in a tight state, preventing the wood veneer from being crushed, and at the same time, there is more space for hot air to enter from the side for drying.

[0024] 6. This utility model has a reasonable design, high reliability, and low failure rate. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the structure of this utility model;

[0027] Figure 2 This is a schematic diagram of the internal structure of the present invention;

[0028] Figure 3 This is a schematic diagram of the internal structure of the present invention from another angle;

[0029] Figure 4 This is a partial structural diagram of the feed end of this utility model;

[0030] Figure 5 This is a partial structural diagram of the feed end of this utility model from another angle;

[0031] Figure 6 This is a partial structural diagram of the feed end of a pressure conveyor.

[0032] Figure 7 This is a partial structural diagram of the discharge end of a counter-pressure conveyor.

[0033] Figure 8 for Figure 6 A magnified view of part A in the middle;

[0034] Figure 9 This is a partial enlarged view of the limiting device;

[0035] Figure 10 This is a magnified view of the connection between the chain and the support crossbar.

[0036] Figure 11 This is a diagram showing the arrangement of the chain and support rods;

[0037] Figure 12 This is a schematic diagram of the structure of the dehumidification outlet control door.

[0038] In the picture:

[0039] Drying oven 1;

[0040] The unit includes a drying chamber 11, a lower drying chamber 111, an upper circulating air chamber 112, a circulating fan 113, a heat exchanger 114, a circulating air outlet 115, and a bearing housing 116.

[0041] Feeding auxiliary device 12, side plate 121, auxiliary guide roller 122;

[0042] 13 exhaust vents;

[0043] Exhaust port control door 14, flap 141, flap shaft 142, push rod 143, flap opening and closing cylinder 144;

[0044] Counter-pressure conveying device 2;

[0045] Conveying device 21, drive sprocket shaft 211, driven sprocket shaft 212, drive sprocket 213, driven sprocket 214, chain 215, L-shaped chain plate 2151, second ventilation port 2152, support crossbar 216, first ventilation hole 2161, screw hole 2162, breathable flexible mesh belt 217, support rod 218, ventilation hole 2181, protrusion 219;

[0046] Gear motor 22;

[0047] Limit bearing 231, connecting plate 232, limit end 233. Detailed Implementation

[0048] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0049] Reference Figure 1-12A continuous pressure dryer for wood veneer includes a drying chamber 1 and a pressure conveying device 2. The drying chamber 1 is divided into several sub-drying chambers 11 along the feeding direction. Each sub-drying chamber 11 is further divided into a lower drying chamber 111 and an upper circulating air chamber 112. A circulating fan 113 that blows air horizontally from one end of the lower drying chamber 111 to the other end is installed. A heat exchanger 114 is installed at the outlet of the circulating fan 113. Circulating air vents 115 leading to the upper circulating air chamber 112 are respectively opened at both ends of the lower drying chamber 111. The lower drying chamber 111 is located between the sub-drying chambers 11. 111 is connected along the feeding direction; the counter-pressure conveyor 2 passes horizontally through the lower drying chamber 111 of the drying box 1 along the feeding direction. The counter-pressure conveyor 2 includes several layers of conveyor devices 21 from top to bottom. The conveyor device 21 includes a drive sprocket shaft 211 and a driven sprocket shaft 212 respectively installed at the feeding end and the discharge end of the drying box 11. Drive sprockets 213 are fixedly installed at both ends of the drive sprocket shaft 211, and driven sprockets 214 are fixedly installed at both ends of the driven sprocket shaft 212. The drive sprockets 213 and driven sprockets 214 are connected. Chains 215 are installed between the chains 215, and several support crossbars 216 are fixedly installed between the chains 215. A ring-shaped, breathable flexible mesh belt 217 is fixedly installed outside the support crossbars 216. The breathable flexible mesh belt 217 has several ventilation holes. A feeding channel is formed between the lower surface of the upper layer of the breathable flexible mesh belt 217 and the upper surface of the lower layer of the breathable flexible mesh belt 217. Support rods 218 for supporting the chains are installed below the chains 215 and are fixed to the drying chamber 1. The upper part of the support rods 218 at the bottom of the breathable flexible mesh belt 217... The surface is fixed with several spaced protrusions (the upper surface of the support rod 218 in the middle of the breathable flexible mesh belt 217 has no protrusions), and the support crossbar 216 is provided with several first ventilation holes 2161 leading to the breathable flexible mesh belt 217; the inner side of the chain 215 is rotatably connected with several limiting devices at intervals. The limiting devices include a vertical rotating shaft, the upper end of which is fixed on the inner side of the chain 215. A limiting bearing 231 or a roller is connected to the rotating shaft, and the circumferential side of the limiting bearing 231 or the roller contacts the inner side of the support rod 218.

[0050] In another preferred embodiment, a drive device is connected to one end of the drive sprocket shaft 211. Specifically, the drive device includes a geared motor 22, and the output shaft of the geared motor 22 is connected to the end of the drive sprocket shaft 213 via a coupling. Bearings are connected to both ends of the drive sprocket shaft 211 and the driven sprocket shaft 212, and the bearings are installed in bearing housings 116, which are fixed to the drying oven 1.

[0051] As another preferred embodiment, the support rod 218 is provided with a plurality of horizontal ventilation holes 2181, which are parallel to the support crossbar 216.

[0052] The protrusion 219 is an arc-shaped protrusion, which allows for a smoother transition. The breathable flexible mesh belt 217 can be a breathable flexible mesh fabric, and the ventilation holes on the breathable flexible mesh belt 217 can be circular or square, etc.

[0053] The breathable flexible mesh belt 217 is fixed to the support crossbar 216 by screws (not shown), and both ends of the support crossbar 216 are provided with screw holes 2162 that cooperate with the screws.

[0054] The chains 215 of the upper and lower conveyor devices 2 are arranged horizontally and staggered to prevent interference between the support rods 218 of the upper and lower layers. The circulating fans 113 in the adjacent lower drying chambers 111 are arranged in an alternating manner so that hot air can be blown onto the wood veneer from both sides, resulting in more uniform heating.

[0055] An L-shaped chain plate 2151 is installed on the inner side of the chain 215. A second horizontal ventilation opening 2152 is provided on the L-shaped chain plate. The two ends of the support crossbar 216 are fixed to the L-shaped chain plate 2151 by second screws (not shown). A connecting plate 232 is fixed to the top of the shaft. The connecting plate 232 is fixed to the bottom of the L-shaped chain plate. A limit end 233 is fixedly connected to the bottom of the shaft.

[0056] As another preferred embodiment, the feeding end of the drying box 1 is equipped with a feeding auxiliary device 12, which includes side plates 121 symmetrically installed on both sides of the drying box, and auxiliary guide rollers 122 at intervals are rotatably connected between the side plates 121.

[0057] The upper surface of the upper circulating air chamber 112 is provided with a dehumidification port 13, and a dehumidification port control door 14 for dehumidification is installed on the dehumidification port 13. The side of the lower drying chamber 111 is provided with an air inlet (not shown) that cooperates with the circulating fan, and an air inlet control door (not shown) for controlling the air intake is installed on the air inlet. The inner surface of the drying box 1 is fixed with a heat insulation layer (not shown). The heat exchanger 114 includes a heat medium inlet and an outlet. The dehumidification port control door 14 includes a flap 141, and a flap shaft 142 is fixedly connected to the flap 141. The two ends of the flap shaft 142 are rotatably connected to the dehumidification port 13. A push rod 143 is vertically fixedly connected to one or both ends of the flap shaft 142, and the other end of the push rod is connected to a flap opening and closing cylinder 144.

[0058] In operation, the wood veneer enters through the feeding channel. The upper and lower surfaces of the veneer are pressed down by the breathable flexible mesh belt 217, making the surface smoother and ensuring more even drying. The veneer is conveyed forward by the breathable flexible mesh belt 217, and the circulating fan 113 blows air. The blown air is heated into hot air by the heat exchanger 114 (the heat exchanger's inlet is connected to hot water or steam, etc.), and blown in from the side of the lower drying chamber 111. This air then passes over the wood veneer, causing it to dry evenly. The side heating of the wood veneer is also achieved by blowing air onto the upper and lower surfaces of the wood veneer through the breathable flexible mesh 217 belt. The hot air passes through the wood veneer and then enters the upper circulating air chamber 112 through the circulating air vent 115. It then enters the lower drying chamber 111 through another circulating air vent 115. After passing through the circulating fan 113 and the heat exchanger 114, the wood veneer is continuously circulated and dried. The dried wood veneer exits from the discharge port at the other end of the drying box 1 and enters the next process.

[0059] This invention does not require additional specific feeding equipment. The wood veneer is directly fed into the drying box for drying through a pressure conveyor device, which can achieve continuous drying, high production efficiency, and high capacity.

[0060] The pressure conveyor device of this utility model uses a breathable flexible mesh belt 217 to press the wood veneer from the top and bottom for drying, which can make the dried wood veneer form a relatively flat board surface, unlike traditional equipment which will cause large deformation after the wood loses moisture and the board surface is very uneven.

[0061] The breathable flexible mesh belt 217 of this utility model has good air permeability. Hot air can be used to dry the wood veneer from all directions through the breathable flexible mesh belt 217. The drying is uniform and effective, and the drying efficiency is also high. In addition, the breathable flexible mesh belt 217 has good softness, which better protects the wood veneer from being crushed.

[0062] The support crossbar 216 has several first ventilation holes 2161 leading to the breathable flexible mesh belt 217, and the support rod 218 has several horizontal ventilation holes 2181. This can reduce the obstruction of hot air by the support crossbar 216 and the support rod 218, so that the hot air can be blown to the upper and lower surfaces and both sides of the wood veneer in the largest possible way.

[0063] The upper surface of the support rod 218 is fixed with several spaced protrusions 219. The protrusions 219 can increase the distance between the upper and lower chains 215 at this position, thereby increasing the distance between the upper and lower breathable flexible mesh belts 217 at this position, increasing the feeding channel at this position, giving the wood veneer more space, so that the wood veneer will not be in a tight state all the time, preventing the wood veneer from being crushed, and at the same time, there is more space for hot air to enter from the side for drying.

[0064] This utility model has a reasonable design, high reliability, and low failure rate.

[0065] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A press-through continuous dryer for wood veneers, characterized in that: The application relates to a drying box and a pair of pressing conveying devices. The drying box is divided into a plurality of sub-drying boxes along a feeding direction, and each sub-drying box is divided into a lower drying chamber and an upper circulating air chamber; a circulating fan is arranged at one end of the lower drying chamber and blows air to the other end horizontally; a heat exchanger is arranged at an air outlet of the circulating fan; circulating air inlets are arranged at both ends of the lower drying chamber and lead to the upper circulating air chamber; and the lower drying chambers of the sub-drying boxes are communicated along the feeding direction. The pair of pressing conveying devices horizontally pass through the lower drying chambers of the drying box along the feeding direction and include a plurality of layers of conveying devices from top to bottom; each conveying device comprises a driving sprocket shaft and a driven sprocket shaft arranged at a feeding end and a discharging end of the drying box respectively; driving sprockets are fixedly arranged at both ends of the driving sprocket shaft; driven sprockets are fixedly arranged at both ends of the driven sprocket shaft; chains are arranged between the driving sprockets and the driven sprockets; a plurality of supporting cross bars are fixedly arranged between the chains; air-permeable flexible mesh belts are fixedly arranged outside the supporting cross bars in a ring shape; a plurality of air-permeable holes are arranged on the air-permeable flexible mesh belts; feeding channels are formed between lower surfaces of upper air-permeable flexible mesh belts and upper surfaces of lower air-permeable flexible mesh belts; supporting rods are arranged below the chains and are used for supporting the chains; the supporting rods are fixed to the drying box; a plurality of spaced protrusions are fixed to upper surfaces of the supporting rods at bottoms of the air-permeable flexible mesh belts; a plurality of first air venting holes are arranged on the supporting cross bars and lead to the air-permeable flexible mesh belts. A plurality of limiting devices are rotatably connected to inner sides of the chains at intervals; each limiting device comprises a vertical rotating shaft; an upper end of the rotating shaft is fixed to the inner side of the chain; a bearing or a roller is connected to the rotating shaft; and a circumferential side of the bearing or the roller is in contact with an inner side of the supporting rod.

2. The press-through continuous dryer for wood veneers as claimed in claim 1, characterized in that: One end of the driving sprocket shaft is drivingly connected to a driving device.

3. The press-through continuous dryer for wood veneers according to claim 2, characterized in that: The driving device comprises a speed reducer motor; an output rotating shaft of the speed reducer motor is connected to an end of the driving sprocket shaft through a shaft coupling.

4. The press-through continuous dryer for wood veneers as claimed in claim 1, characterized in that: A plurality of horizontal air venting holes are arranged on the supporting rod and are parallel to the supporting cross bars.

5. The press-through continuous dryer for wood veneers as claimed in claim 1, characterized in that: The protrusions are arc-shaped protrusions.

6. The press-through continuous dryer for wood veneers as claimed in claim 1, characterized in that: The air-permeable flexible mesh belts are fixed to the supporting cross bars through screws; and screw holes matched with the screws are arranged at both ends of the supporting cross bars.

7. The press-through continuous dryer for wood veneers as claimed in claim 1, characterized in that: The chains of upper and lower conveying devices are arranged horizontally at intervals; and the circulating fans in adjacent lower drying chambers are arranged at intervals.

8. The press-through continuous dryer for wood veneers as claimed in claim 1, characterized in that: L-shaped chain plates are arranged on the inner sides of the chains; horizontal second air venting holes are arranged on the L-shaped chain plates; the supporting cross bars are fixed to the L-shaped chain plates through second screws at both ends; a connecting plate is fixed to a top of the rotating shaft and is fixed to a bottom of the L-shaped chain plate; and a limiting end is fixed to a bottom of the rotating shaft.

9. The press-through continuous dryer for wood veneers as claimed in claim 1, characterized in that: A feeding auxiliary device is arranged at the feeding end of the drying box; the feeding auxiliary device comprises side plates symmetrically arranged at both sides of the drying box; and a plurality of spaced auxiliary guide rollers are rotatably connected between the side plates.

10. The press-through continuous dryer for wood veneers as claimed in claim 1, characterized in that: An upper surface of the upper circulating air chamber is provided with a moisture discharging port; a moisture discharging port control door for discharging moisture is arranged on the moisture discharging port; a side surface of the lower drying chamber is provided with an air inlet matched with the circulating fan; and an air inlet control door for controlling air inlet is arranged on the air inlet.

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