Opposite-pressing continuous dryer for wood veneers

Abstract

The invention 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 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] The invention relates to drying equipment, in particular to a counter-pressure continuous drying machine for wood veneers. Background Art

[0002] Wood veneer is made by cutting trees into segments, and then peeling them along the circular surface of the segments into strips of specified thickness. Wood veneer is generally thin, with a thickness of 0.5 to 3.2 mm. The freshly peeled wood veneer is relatively wet and needs to be dried.

[0003] For example, the invention patent with publication number CN 114485122A discloses a tunnel-type wood veneer drying production line. During drying, the wood veneers need to be inserted into the clips on the chain one by one and then sent to the dryer for drying, which has low efficiency and low production capacity.

[0004] Some drying equipment also uses rollers that are symmetrically arranged at the top and bottom to transport the veneers to the dryer for drying. On the one hand, the rollers are close to the surface of the veneers, which affects the drying of the veneers. On the other hand, the rollers are rigid and can easily damage the veneers. In addition, the veneers will expand and contract during heating, and the rollers are rigid and cannot be deformed, so using rollers will also damage the veneers. Summary of the invention

[0005] In order to solve the problems in the background technology, the present invention proposes a counter-pressure continuous drying machine for wood veneers with high production efficiency and low energy consumption, which has high production efficiency and low energy consumption.

[0006] The technical solution of the present invention is achieved in this way:

[0007] A counter-pressure continuous drying machine for wood veneers comprises a drying box and a counter-pressure conveying device; the drying box is divided into a plurality of sub-drying boxes along a feeding direction, the sub-drying boxes are divided into a lower drying chamber and an upper circulating air chamber, a circulating fan for blowing air horizontally toward the other end is installed at one end of the lower drying chamber, a heat exchanger is installed at the air outlet of the circulating fan, circulating air outlets leading to the upper circulating air chamber are respectively opened at both ends of the lower drying chamber, and the lower drying chambers between the sub-drying boxes are connected along the feeding direction; the counter-pressure conveying device horizontally passes through the lower drying chamber of the drying box along the feeding direction, the counter-pressure conveying device comprises a plurality of layers of conveying devices from top to bottom, and the conveying device comprises a driving sprocket shaft and a driven sprocket respectively arranged at the feeding end and the discharging end of the drying box. Axle, driving sprockets are fixedly installed at both ends of the driving sprocket shaft, and driven sprockets are fixedly installed at both ends of the driven sprocket shaft, a chain is installed between the driving sprocket and the driven sprocket, and a number of supporting cross bars are fixedly installed between the chains. An annular breathable flexible mesh belt is fixedly installed outside the supporting cross bar, and a number of breathable 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 supporting rod for supporting the chain is installed below the chain, and the supporting rod is fixed on the drying box. A number of spaced protrusions are fixed on the upper surface of the supporting rod at the bottom of the breathable flexible mesh belt, and a number of first ventilation holes leading to the breathable flexible mesh belt are opened on the supporting cross bar;

[0008] The inner side surface of the chain is connected to a plurality of limit devices for rotation at intervals. The limit devices include a vertical rotating shaft, the upper end of which is fixed on the inner side surface of the chain, and a bearing or a roller is connected to the rotating shaft. The circumferential side surface of the bearing or the roller contacts the inner side surface of the support rod.

[0009] Preferably, one end of the driving sprocket shaft is transmission-connected with a driving device.

[0010] Preferably, the driving device comprises a reduction motor, and the output shaft of the reduction motor is connected to the end of the driving sprocket shaft through a coupling.

[0011] Preferably, the support rod is provided with a plurality of horizontal ventilation holes, and the ventilation holes are parallel to the support cross bar.

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

[0013] Preferably, the breathable flexible mesh belt is fixed to the supporting cross bar by screws, and screw holes cooperating with the screws are provided at both ends of the supporting cross bar.

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

[0015] Preferably, an L-shaped chain plate is installed on the inner side of the chain, and a second horizontal transverse ventilation hole is opened on the L-shaped chain plate. The two ends of the supporting cross bar are fixed to the L-shaped chain plate by second screws. A connecting plate is fixed on the top of the rotating shaft, and the connecting plate is fixed to the bottom of the L-shaped chain plate. The bottom of the rotating shaft is fixedly connected to a limited end.

[0016] Preferably, a feeding auxiliary device is installed at the feeding end of the drying box, and the feeding auxiliary device includes side plates symmetrically installed on both sides of the drying box, and a plurality of auxiliary guide rollers spaced apart are rotatably connected between the side plates.

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

[0018] Beneficial effects of the present invention:

[0019] 1. The feeding method of the present invention does not require additional special feeding equipment. The wood veneer is directly fed into the drying box for drying through a pressure conveying device, which can realize continuous drying, high production efficiency and high capacity.

[0020] 2. The pressure conveying device of the present invention uses a breathable flexible mesh belt to press the wood veneer from top and bottom for drying, so that the dried wood veneer can form a relatively flat board surface, instead of causing large deformation and making the board surface very uneven after losing water due to drying like traditional equipment.

[0021] 3. The breathable flexible mesh belt of the present invention has good air permeability. Hot air can pass through the breathable flexible mesh belt to dry the wood veneer in all directions. The drying is uniform and effective. The drying efficiency is also high. In addition, the mesh belt has good softness, and the wood veneer is better protected from being crushed.

[0022] 4. The support crossbar is provided with a plurality of first ventilation holes leading to the breathable flexible mesh belt, and the support rod is provided with a plurality of horizontal ventilation holes, which can reduce the obstruction of the support crossbar and the support rod to the hot air, so that the hot air can be blown to the upper and lower surfaces and both sides of the wood veneer in the largest amount.

[0023] 5. Several spaced protrusions are fixed on the upper surface of the support rod. The protrusions can increase the distance between the upper and lower chains at that position, thereby increasing the distance between the upper and lower breathable flexible mesh belts at that position, increasing the feed channel at that position, giving the veneer more space, so that the veneer will not be in a tightly compressed state all the time, preventing the veneer from being crushed, and also allowing more space for hot air to enter from the side for drying.

[0024] 6. The present invention has reasonable design, high reliability and low failure rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 It is a structural schematic diagram of the present invention;

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

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

[0029] Figure 4 It is a partial structural schematic diagram of the feed end of the present invention;

[0030] Figure 5 It is a schematic diagram of the partial structure of the feed end of the present invention from another angle;

[0031] Figure 6 It is a schematic diagram of the partial structure of the feeding end of the pressure conveying device;

[0032] Figure 7 It is a partial structural schematic diagram of the discharge end of the pressure conveying device;

[0033] Figure 8 for Figure 6 A partial enlarged view of the portion shown in A;

[0034] Fig. 9 It is a partial enlarged view of the limiting device;

[0035] Fig.10 It is a partial enlarged view of the connection part between the chain and the supporting crossbar;

[0036] Fig.11 This is the arrangement diagram of the chain and support rod;

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

[0038] In the figure:

[0039] Drying box 1;

[0040] Sub-drying box 11, lower drying chamber 111, upper circulating air chamber 112, circulating fan 113, heat exchanger 114, circulating air outlet 115, bearing seat 116;

[0041] A feeding auxiliary device 12, a side plate 121, and an auxiliary guide roller 122;

[0042] Moisture discharge port 13;

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

[0044] Pressure conveying device 2;

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

[0046] Reducer motor 22;

[0047] Limit bearing 231 , connecting plate 232 , limit end 233 . DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] Reference Figure 1-12A counter-pressure continuous drying machine for wood veneers comprises a drying box 1 and a counter-pressure conveying device 2; the drying box 1 is divided into a plurality of sub-drying boxes 11 along the feeding direction, the sub-drying boxes 11 are divided into a lower drying chamber 111 and an upper circulating air chamber 112, one end of the lower drying chamber 111 is equipped with a circulating fan 113 for blowing air horizontally to the other end, the air outlet of the circulating fan 113 is equipped with a heat exchanger 114, and the two ends of the lower drying chamber 111 are respectively provided with circulating air ports 115 leading to the upper circulating air chamber 112, and the lower drying chamber between the sub-drying boxes 11 is provided with a plurality of sub-drying boxes 11; 111 is connected along the feeding direction; the pressure conveying device 2 passes horizontally through the lower drying chamber 111 of the drying box 1 along the feeding direction, and the pressure conveying device 2 includes a plurality of layers of conveying devices 21 from top to bottom, and the conveying device 21 includes a driving sprocket shaft 211 and a driven sprocket shaft 212 respectively arranged at the feeding end and the discharging end of the drying box 11, and the two ends of the driving sprocket shaft 211 are respectively fixedly installed with a driving sprocket 213, and the two ends of the driven sprocket shaft 212 are respectively fixedly installed with a driven sprocket 214, and the driving sprocket 213 and the driven sprocket 214 are respectively fixedly installed. A chain 215 is installed between the chains 215, and a plurality of support cross bars 216 are fixedly installed between the chains 215. An annular breathable flexible mesh belt 217 is fixedly installed outside the support cross bars 216. The breathable flexible mesh belt 217 is provided with a plurality of breathable holes. A feeding channel is formed between the lower surface of the upper breathable flexible mesh belt 217 and the upper surface of the lower breathable flexible mesh belt 217. A support rod 218 for supporting the chain is installed below the chain 215. The support rod 218 is fixed on the drying box 1. The upper surface of the support rod 218 at the bottom of the breathable flexible mesh belt 217 A plurality of spaced protrusions are fixed on the surface (there is no protrusion on the upper surface of a support rod 218 in the middle of the breathable flexible mesh belt 217), and a plurality of first ventilation holes 2161 leading to the breathable flexible mesh belt 217 are provided on the support cross bar 216; a plurality of limit devices are connected to the rotation at intervals on the inner side surface of the chain 215, and the limit device includes a vertical rotating shaft, the upper end of the rotating shaft is fixed on the inner side surface of the chain 215, and a limit bearing 231 or a roller is connected to the rotating shaft, and the circumferential side surface of the limit bearing 231 or the roller is in contact with the inner side surface of the support rod 218.

[0050] As another preferred embodiment, one end of the driving sprocket shaft 211 is connected to a driving device. Specifically, the driving device includes a reduction motor 22, and the output shaft of the reduction motor 22 is connected to the end of the driving sprocket shaft 213 through a coupling. Both ends of the driving sprocket shaft 211 and the driven sprocket shaft 212 are connected to bearings, which are installed in the bearing seat 116, and the bearing seat is fixed on the drying box 1.

[0051] As another preferred implementation, a plurality of horizontal ventilation holes 2181 are formed on the support rod 218 , and the ventilation holes 2181 are parallel to the support cross bar 216 .

[0052] The protrusion 219 is an arc-shaped protrusion, and the transition can be smoother. The breathable flexible mesh belt 217 can be a breathable flexible mesh cloth, and the air holes on the breathable flexible mesh belt 217 can be round or square.

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

[0054] The chains 215 of the upper and lower conveying devices 2 are arranged horizontally staggered to prevent interference between the upper and lower support rods 218. The circulating fans 113 in the adjacent lower drying chambers 111 are arranged staggered so that both sides can blow hot air to the wood veneer for more uniform heating.

[0055] An L-shaped chain plate 2151 is installed on the inner side of the chain 215, and a second horizontal vent 2152 is opened on the L-shaped chain plate. Both ends of the supporting cross bar 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 rotating shaft, and the connecting plate 232 is fixed to the bottom of the L-shaped chain plate. The bottom of the rotating shaft is fixedly connected to a limited end 233.

[0056] As another preferred embodiment, a feeding auxiliary device 12 is installed at the feeding end of the drying box 1. The feeding auxiliary device 12 includes side panels 121 symmetrically installed on both sides of the drying box, and a plurality of spaced auxiliary guide rollers 122 are rotatably connected between the side panels 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) cooperating with the circulating fan, and an air inlet control door (not shown) for controlling air intake is installed on the air inlet. A heat preservation layer (not shown) is fixed on the inner surface of the drying box 1, and the heat exchanger 114 includes a heat medium inlet and outlet. The dehumidification port control door 14 includes a flap 141, and a flap shaft 142 is fixedly connected to the flap 141. Both ends of the flap shaft 142 are rotatably connected to the dehumidification port 13. One end or both ends of the flap shaft 142 are vertically fixedly connected to a push rod 143, and the other end of the push rod is connected to a flap opening and closing cylinder 144.

[0058] When the present invention is working, the wood veneer enters from the feed channel, and the upper and lower surfaces of the wood veneer are pressed by the air-permeable flexible mesh belt 217, so that the board surface of the wood veneer is flatter and the subsequent drying is more uniform. The wood veneer is transported forward by the air-permeable flexible mesh belt 217, and the circulating fan 113 works to blow air. The blown air is heated into hot air by the heat exchanger 114 (the heat medium inlet of the heat exchanger is connected to hot water or steam and other heat media), and blown into from the side of the lower drying chamber 111, passing through the wood veneer, the wood The side of the veneer is heated and blown to the upper and lower surfaces of the wood veneer through the breathable flexible mesh 217 to heat the upper and lower surfaces of the wood veneer. After passing through the wood veneer, the hot air enters the upper circulation air chamber 112 through the circulation air outlet 115, and then enters the lower drying chamber 111 from another circulation air outlet 115, and then passes through the circulation fan 113 and the heat exchanger 114. The drying cycle is continuously repeated. The dried wood veneer goes out from the discharge port at the other end of the drying box 1 and enters the next process.

[0059] The feeding of the present invention does not require additional special feeding equipment, and the wood veneer is directly fed into the drying box for drying through the pressure-type conveying device, thereby realizing continuous drying, high production efficiency and high capacity.

[0060] The pressure conveying device of the present invention uses a breathable flexible mesh belt 217 to press the wood veneer from top and bottom for drying, so that the dried wood veneer can form a relatively flat board surface, instead of causing large deformation and making the board surface very uneven after losing water due to drying like traditional equipment.

[0061] The breathable flexible mesh belt 217 of the present invention has good air permeability, and hot air can pass through the breathable flexible mesh belt 217 to dry the wood veneer in all directions. 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 cross bar 216 is provided with a plurality of first ventilation holes 2161 leading to the breathable flexible mesh belt 217, and the support rod 218 is provided with a plurality of horizontal ventilation holes 2181, which can reduce the obstruction of the support cross bar 216 and the support rod 218 to the hot air, so that the hot air can be blown to the upper and lower surfaces and both sides of the wood veneer in the greatest amount.

[0063] A plurality of spaced protrusions 219 are fixed on the upper surface of the support rod 218. 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, thereby increasing the feed channel at this position, giving the wood veneer more space, so that the wood veneer will not be in a tightly compressed state all the time, preventing the wood veneer from being crushed, and also allowing more space for hot air to enter from the side for drying.

[0064] The invention has reasonable design, high reliability and low failure rate.

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

Claims

1. A continuous pressure drying machine for wood veneer, characterized in that: include A drying box, the drying box is divided into several sub-drying boxes along the feeding direction, the sub-drying boxes are divided into a lower drying chamber and an upper circulating air chamber, a circulating fan for blowing horizontally to the other end is installed at one end of the lower drying chamber, a heat exchanger is installed at the air outlet of the circulating fan, circulating air outlets leading to the upper circulating air chamber are respectively opened at both ends of the lower drying chamber, and the lower drying chambers between the sub-drying boxes are connected along the feeding direction; A counter-pressure conveying device, which passes horizontally through the lower drying chamber of the drying box along the feeding direction, comprises several layers of conveying devices from top to bottom, the conveying device comprises a driving sprocket shaft and a driven sprocket shaft which are respectively arranged at the feeding end and the discharging end of the drying box, the two ends of the driving sprocket shaft are respectively fixedly mounted with driving sprockets, the two ends of the driven sprocket shaft are respectively fixedly mounted with driven sprockets, a chain is installed between the driving sprocket and the driven sprocket, several supporting cross bars are fixedly installed between the chains, an annular breathable flexible mesh belt is fixedly installed outside the supporting cross bar, a plurality of air holes are provided 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 supporting rod for supporting the chain is installed below the chain, the supporting rod is fixed on the drying box, a plurality of spaced protrusions are fixed on the upper surface of the supporting rod at the bottom of the breathable flexible mesh belt, and a plurality of first ventilation holes leading to the breathable flexible mesh belt are provided on the supporting cross bar; The inner side surface of the chain is connected to a plurality of limit devices for rotation at intervals. The limit devices include a vertical rotating shaft, the upper end of which is fixed on the inner side surface of the chain, and a bearing or a roller is connected to the rotating shaft. The circumferential side surface of the bearing or the roller contacts the inner side surface of the support rod.

2. The continuous pressure drying machine for wood veneer according to claim 1, characterized in that: One end of the driving sprocket shaft is transmission-connected with a driving device.

3. The continuous pressure drying machine for wood veneer according to claim 2, characterized in that: The driving device comprises a reduction motor, and the output shaft of the reduction motor is connected to the end of the driving sprocket shaft through a coupling.

4. The continuous pressure drying machine for wood veneer according to claim 1, characterized in that: The support rod is provided with a plurality of horizontal ventilation holes, and the ventilation holes are parallel to the support cross bar.

5. The continuous pressure drying machine for wood veneer according to claim 1, characterized in that: The protrusion is an arc-shaped protrusion.

6. The continuous pressure drying machine for wood veneer according to claim 1, characterized in that: The breathable flexible mesh belt is fixed to the supporting crossbar by screws, and screw holes cooperating with the screws are provided at both ends of the supporting crossbar.

7. The continuous pressure drying machine for wood veneer according to claim 1, characterized in that: The chains of the conveying devices on the upper and lower layers are arranged horizontally in a staggered manner, and the circulating fans in the adjacent lower drying chambers are arranged in a staggered manner.

8. The continuous pressure drying machine for wood veneer according to claim 1, characterized in that: An L-shaped chain plate is installed on the inner side of the chain, and a second horizontal vent is opened on the L-shaped chain plate. The two ends of the supporting cross bar are fixed to the L-shaped chain plate by second screws. A connecting plate is fixed on the top of the rotating shaft, and the connecting plate is fixed to the bottom of the L-shaped chain plate. The bottom of the rotating shaft is fixedly connected to a limited end.

9. The continuous pressure drying machine for wood veneer according to claim 1, characterized in that: A feeding auxiliary device is installed at the feeding end of the drying box. The feeding auxiliary device includes side plates symmetrically installed on both sides of the drying box, and a plurality of spaced auxiliary guide rollers are rotatably connected between the side plates.

10. The counter-pressure continuous drying machine for wood veneer according to claim 1, characterized in that: The upper surface of the upper circulating air chamber is provided with a dehumidification port, on which a dehumidification port control door for dehumidifying air is installed; the side of the lower drying chamber is provided with an air inlet cooperating with the circulating fan, on which an air inlet control door for controlling air intake is installed.

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