Feeding system of an automated veneer drying device
Through the feeding system of the automated wood vase drying device, the problems of large labor demand, serious damage and weather dependence during the wood vase drying process are solved, and fast and accurate wood vase transport and drying are achieved, which improves production efficiency and reduces costs.
Patent Information
- Application Number
- CN202011010682.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2020-09-23
- Publication Date
- 2025-08-01
- Estimated Expiration
- 2040-09-23
AI Technical Summary
The existing wood vase requires a lot of labor during drying, which can easily damage the wood vase, cover a large area, low production efficiency, and are greatly affected by the weather, resulting in high production costs.
The feeding system of an automated wooden vase drying device is adopted. Through the cooperation of adsorption components and guide frames, the automatic separation of the wooden vase and feeding it into the drying unit is achieved, thereby reducing the clamping of the wooden vase, and the vacuum device and transmission roller are used to achieve fast and accurate conveying.
Automatic drying of soft and thin wood vase is achieved, reducing labor costs, reducing damage to wood vase, reducing site occupation, improving production efficiency and drying rate, and reducing production costs.
Smart Images
Figure CN112082358B_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a feeding system of a drying device used in the case of product drying. More specifically, the present invention relates to a feeding system of an automated veneer drying device used in the case of veneer processing. Background Art
[0002] Veneer, commonly known as middle skin, is formed by rotary cutting after wet miscellaneous wood is cut to a fixed length. Its main uses are as the main raw materials for multi-layer boards, wood templates, blockboards, and composite ecological boards, and the market demand is large.
[0003] After the product is processed and formed, it has characteristics such as high water content, thinness, and easy tearing. Generally speaking, the specifications required by the market for it are generally: 1300mm * 800mm, with a thickness of 0.6mm - 2mm. When this veneer is processed by turning, in order to ensure the turning effect and stability, the usual practice is to perform the processing operation when the log in sections has moisture. Therefore, the veneer after turning has a heavy water content and is prone to adhesion. When the veneer is formed into a finished product for factory shipment, its moisture content needs to be controlled to be less than 90%. Therefore, the usual practice in the prior art is to manually separate the stacked veneer after turning, and then use a matching drying rack to longitudinally arrange the separated veneer on the drying ground, and dry it until the moisture content is less than about 90% and then collect it as a finished product.
[0004] However, the problems existing in the existing operation method are as follows: First, a large amount of labor is required, and the veneer separated manually is prone to tearing damage, resulting in it becoming an unqualified product and unable to be used, affecting its finished product rate and causing waste; Second, the drying ground occupies a large area, and the drying effect and drying cycle are greatly affected by the weather. In case of rainy weather or weather changes, the dried veneer needs to be collected, resulting in a large labor cost, and if the temperature is too high, the veneer is prone to warping or curling; One mu of drying ground can only dry 3m3 of veneer in one day under good weather conditions such as 25 degrees to 28 degrees; If the environmental temperature is too low or the humidity is too high, the drying days will be extended, resulting in a significant reduction in the production capacity of the veneer, thereby increasing the production cost and lowering the production efficiency.
[0005] The patent with the publication number CN110595189A discloses an automated veneer drying device, which is characterized by including: multiple feeding units; a drying unit, on which multiple drying zones are set according to different drying temperatures; a feeding unit that cooperates with each group of feeding units to separate the veneers stacked on the feeding units and respectively convey them to the feeding unit of the drying unit; wherein, each separated veneer is vertically arranged in the drying zone through a clamping unit arranged on the drying unit to realize an automated drying operation. The defect of this technical solution is that the upper end of the veneer needs to be clamped during feeding, and the distance between the veneers needs to be controlled by a fixture. The device is complex, and it is difficult to position soft and thin veneers, resulting in great damage to the veneers. Summary of the Invention
[0006] The purpose of the present invention is to provide a feeding system for an automated veneer drying device, which can adsorb soft and thin veneers and quickly and accurately send them into each horizontal drying layer of the drying unit.
[0007] The technical solution adopted by the present invention is as follows.
[0008] A feeding system for an automated veneer drying device, the automated veneer drying device includes a drying unit, the drying unit is provided with a plurality of horizontal drying layers, and a plurality of horizontal drying layer longitudinal driving rollers with the same top surface are arranged on each horizontal drying layer. Each horizontal drying layer longitudinal driving roller is connected to a horizontal drying layer longitudinal driving roller driving device; the feeding system includes a transition guide frame, a feeding unit, and a feeding unit.
[0009] The transition guide frame includes a transition guide frame body, and a plurality of frame plates with the same number as the feeding ends of the horizontal drying layers of the drying unit are arranged on the transition guide frame body. The near-feeding-unit ends of each frame plate respectively correspond to the feeding ends of a horizontal drying layer, the far-feeding-unit ends of each frame plate are close to each other, and the height of the far-feeding-unit ends of each frame plate is not lower than its near-feeding-unit end; a plurality of frame plate longitudinal driving rollers with the same top surface are arranged on each frame plate.
[0010] The feeding unit includes a feeding unit body, a guide plate frame arranged on the feeding unit body, an adsorption assembly, and an adsorption assembly position adjustment device; longitudinal extrusion roller pairs composed of two longitudinally arranged extrusion rollers with a gap of one veneer thickness are arranged at both ends of the guide plate frame; at least one longitudinal extrusion roller of each longitudinal extrusion roller pair is connected to a longitudinal extrusion roller driving motor.
[0011] The far-transition-guide-frame end of the guide plate frame is hinged to the feeding unit body, and the near-transition-guide-frame end of the guide plate frame is hinged to the feeding unit body through a first linear telescopic device. By the telescopic movement of the first linear telescopic device, the near-transition-guide-frame end of the guide plate frame is docked with the far-drying-unit ends of each frame plate.
[0012] The feeding unit is arranged below the adsorption component.
[0013] As a preferred technical solution, the adsorption component includes a vertical plate, a vacuum pumping device, a plurality of suction cups installed on the vertical plate through vertically arranged second linear telescopic devices, and hoses having the same number as the suction cups;
[0014] The adsorption component position adjusting device includes two swing frames symmetrically arranged front and rear, and a swing frame driving device; the vacuum pumping device is arranged at the top end of the feeding unit frame; each suction cup is connected to the vacuum pumping device through a hose; each swing frame includes two pulling plates having the same length, perpendicular to the vertical plate and parallel to each other, the bottom ends of the two pulling plates are respectively hinged to a cross plate; the front and rear ends of the vertical plate are respectively hinged to the cross plate; the top ends of the two pulling plates are respectively hinged to the feeding unit frame;
[0015] The swing frame driving device includes a swing driving motor installed on the vertical plate, a driving shaft is longitudinally arranged on the swing driving motor, the front and rear ends of the driving shaft are symmetrically connected with turning plates having the same length and perpendicular to the driving shaft, the end of each turning plate away from the driving shaft is hinged with inclined plates having the same length and symmetrically arranged front and rear and perpendicular to the driving shaft, each inclined plate is hinged to the swing frame, and the swing of the swing frame is realized by the rotation of the driving shaft.
[0016] As a preferred technical solution, the feeding unit is provided with a veneer conveying device.
[0017] As a preferred technical solution, the veneer conveying device includes veneer conveyor belts longitudinally arranged on the left and right sides at the top end of the feeding unit.
[0018] As a preferred technical solution, the feeding unit includes an inner part located within the feeding unit frame and an outer part located outside the feeding unit frame, and the inner part of the feeding unit located within the feeding unit frame is located below the adsorption component.
[0019] As a preferred technical solution, a tray is placed on the veneer conveying device; a tray lifting device is arranged below the veneer conveyor belt of the feeding unit located within the feeding unit frame. The provision of the tray lifting device can reduce the stroke of the second linear telescopic device. The second linear telescopic device is a hydraulic cylinder or an electric push rod.
[0020] As a preferred technical solution, the tray lifting device is a scissor lift.
[0021] As a preferred technical solution, a plurality of through holes are vertically arranged on the vertical plate, and each through hole passes through a conduit; the bottom end of each conduit is connected to a suction cup, and the top end of each conduit is connected to a hose.
[0022] As a preferred technical solution, a plurality of suction cups are arranged at the front and rear ends of the vertical plate respectively.
[0023] As a preferred technical solution, the hose is a corrugated pipe.
[0024] As a preferred technical solution, the vacuum pumping device includes vacuum pumping fans respectively located at the front and rear ends of the top of the loading unit frame, a longitudinally arranged connecting pipe, the two vacuum pumping fans are connected to the connecting pipe, and the connecting pipe is connected to each hose.
[0025] The feeding process includes the following steps:
[0026] Step 1: The feeding unit transports a stack of veneers into the loading unit;
[0027] The second linear telescopic device controls the suction cup to move to the top surface of the stack of veneers, and the suction cup adsorbs a veneer;
[0028] Step 2: The adsorption component position adjustment device drives the suction cup to move upward in an arc, and transports the veneer to between the two longitudinal pressing rollers of the longitudinal pressing roller pair of the guide plate frame far from the feeding unit. The two longitudinal pressing rollers rotate to transport the veneer into the two longitudinal pressing rollers at the end of the guide plate frame close to the feeding unit;
[0029] Step 3: The first linear telescopic device controls the guide plate frame to rotate along the end far from the transition guide frame, so that the end of the guide plate frame close to the transition guide frame is butted against a frame plate of the transition guide frame; the two longitudinal pressing rollers at the end of the guide plate frame close to the feeding unit rotate to send the veneer into the frame plate of the transition guide frame, and the longitudinal driving roller of the frame plate rotates to send the veneer into the horizontal drying layer of the drying unit flush with the frame plate;
[0030] Repeat in this way to achieve the feeding action.
[0031] The beneficial effects of the present invention are: it can adsorb soft and thin veneers and accurately send them into each horizontal drying layer of the drying unit without clamping the soft and thin veneers. The veneer is transported quickly and accurately without using jigs, and the damage to the veneer is small. By setting the cooperating feeding unit, loading unit, transition guide frame, and drying unit, the present invention realizes the automatic separation, automatic feeding, and automatic drying of veneers, has low requirements for the site area, is not dependent on the weather at the same time, has an effective drying rate of the product, reduces the labor cost, thereby reducing the production cost, and the production efficiency meets the production requirements. Brief Description of the Drawings
[0032] Figure 1 is a schematic three-dimensional structure diagram of a preferred embodiment of the feeding system of the automatic veneer drying device of the present invention.
[0033] Figure 2 is [[ID=Q3]] Figure 1 a partial enlarged view of part A of [[ID=3S]]
[0034] Figure 3 is Figure 1 a partial enlarged view of part B of
[0035] Figure 4 is Figure 1 The right view of the feeding system of the automatic veneer drying device shown in
[0036] Figure 5 is Figure 4 The partial enlarged view of part C of
[0037] Figure 6 is Figure 1 The front view of the feeding system of the automatic veneer drying device shown in
[0038] Figure 7 is Figure 6 The partial enlarged view of part D of
[0039] Figure 8 is Figure 6 The partial enlarged view of part E of
[0040] Figure 9 is Figure 1 The top view of the feeding system of the automatic veneer drying device shown in
[0041] Figure 10 is Figure 9 The partial enlarged view of part F of
[0042] Figure 11 is Figure 9 The sectional view along G-G’ of
[0043] Figure 12 is Figure 11 The partial enlarged view of part H of
[0044] Figure 13 is Figure 11 The partial enlarged view of part I of
[0045] Figure 14 It is a schematic diagram of a use state of the feeding system of the automatic veneer drying device of the present invention.
[0046] Figure 15 is Figure 14 The partial enlarged view of part J of
[0047] Figure 16 It is a schematic diagram of a use state of the feeding system of the automatic veneer drying device of the present invention.
[0048] Figure 17 is Figure 16 The partial enlarged view of part K of
[0049] Figure 18 It is a three-dimensional structural schematic diagram of the adsorption component position adjustment device.
[0050] Figure 19 is Figure 18 a partial enlarged view of the L part of
[0051] Figure 20 is Figure 18 a partial enlarged view of the M part of
[0052] Figure 21 a schematic diagram of a preferred embodiment of the feeding system of the automatic veneer drying device of the present invention.
[0053] Wherein: drying unit - 1; horizontal drying layer - 11; horizontal drying layer longitudinal driving roller - 12; horizontal drying layer longitudinal driving roller driving device - 13;
[0054] transition guide frame - 2; transition guide frame body - 21; frame plate - 22; frame plate longitudinal driving roller - 23;
[0055] feeding unit - 3; feeding unit body - 31; guide plate frame - 32; adsorption component position adjusting device - 33; adsorption component - 34; first linear telescopic device - 35; longitudinal extrusion roller - 36; longitudinal plate - 37; vacuum pumping device - 38; second linear telescopic device - 39; suction cup - 310; pulling plate - 311; cross plate - 312; swing driving motor - 313; driving shaft - 314; rotating plate - 315; inclined plate - 316; hose - 317; vacuum pumping fan - 318; connecting pipe - 319; longitudinal extrusion roller driving motor - 320; conduit - 321;
[0056] feeding unit - 4; the part located inside the feeding unit body - 41; the part located outside the feeding unit body - 42; veneer conveyor belt - 43; tray - 44; tray lifting device - 45.
[0057] Veneer - 5. Detailed implementation manners
[0058] The following further describes the present invention in detail with reference to the accompanying drawings, so that those skilled in the art can implement it according to the description in the specification.
[0059] Embodiment 1. As Figure 1-17 shown, a feeding system of an automatic veneer drying device, the automatic veneer drying device includes a drying unit 1, the drying unit 1 is provided with a plurality of horizontal drying layers 11, each horizontal drying layer 11 is provided with a plurality of horizontal drying layer longitudinal driving rollers 12 with flush top surfaces, and each horizontal drying layer longitudinal driving roller 12 is connected to a horizontal drying layer longitudinal driving roller driving device 13; the feeding system includes a transition guide frame 2, a feeding unit 3, and a feeding unit 4;
[0060] The transition guide frame 2 includes a transition guide frame body 21. On the transition guide frame body 21, there are frame plates 22 with the same number as the feeding ends of the horizontal drying layers 11 of the drying unit 1. The ends of each frame plate 22 close to the feeding unit 4 correspond to the feeding ends of a horizontal drying layer 11 respectively. The ends of each frame plate 22 far from the feeding unit 4 are close to each other, and the height of the ends of each frame plate 22 far from the feeding unit 4 is not lower than the height of the ends of each frame plate 22 close to the feeding unit 4. On each frame plate 22, there are frame plate longitudinal driving rollers 23 with their top surfaces on the same plane.
[0061] The feeding unit 3 includes a feeding unit frame body 31, a guide plate frame 32 arranged on the feeding unit frame body 31, an adsorption assembly 34, and an adsorption assembly position adjustment device 33. At both ends of the guide plate frame 32, there are longitudinal extrusion roller pairs each composed of two longitudinal extrusion rollers 36 arranged vertically with a gap of the thickness of a veneer. At least one longitudinal extrusion roller 36 of each longitudinal extrusion roller pair is connected to a longitudinal extrusion roller driving motor 320.
[0062] The end of the guide plate frame 32 far from the transition guide frame 2 is hinged to the feeding unit frame body 31, and the end of the guide plate frame 32 close to the transition guide frame 2 is hinged to the feeding unit frame body 31 through a first linear expansion device 35. Through the expansion and contraction of the first linear expansion device 35, the end of the guide plate frame 32 close to the transition guide frame 2 is docked with the ends of each frame plate 22 far from the drying unit 1. The first linear expansion device 35 is a hydraulic cylinder or an electric push rod.
[0063] The feeding unit 4 is arranged below the adsorption assembly 34.
[0064] The adsorption assembly 34 includes a longitudinal plate 37, a vacuum pumping device 38, a plurality of suction cups 310 installed on the longitudinal plate 37 through vertically arranged second linear expansion devices 39, and hoses 317 with the same number as the suction cups 310.
[0065] As Figure 18-20 shown, the adsorption assembly position adjustment device includes two swing frames symmetrically arranged front and back and a swing frame driving device. The vacuum pumping device 38 is arranged at the top of the feeding unit frame body 31. Each suction cup 310 is connected to the vacuum pumping device 38 through a hose 317. Each swing frame includes two pull plates 311 with the same length, perpendicular to the longitudinal plate 37 and parallel to each other. The bottom ends of the two pull plates 311 are respectively hinged to a cross plate 312. The front and rear ends of the longitudinal plate 37 are respectively hinged to the cross plate 312. The top ends of the two pull plates 311 are respectively hinged to the feeding unit frame body 31.
[0066] The swing frame driving device includes a swing driving motor 313 installed on the longitudinal plate 37. A driving shaft 314 is longitudinally arranged on the swing driving motor 313. The front and rear ends of the driving shaft 314 are symmetrically connected with rotating plates 315 of the same length perpendicular to the driving shaft 314. The ends of each rotating plate 315 far from the driving shaft 314 are hinged with inclined plates 316 of the same length and symmetrically arranged front and rear perpendicular to the driving shaft 314. Each inclined plate 316 is hinged with the swing frame. The swing of the swing frame is realized by the rotation of the driving shaft 314.
[0067] A veneer conveying device is provided on the feeding unit 4.
[0068] The veneer conveying device includes veneer conveyor belts 43 longitudinally arranged on the left and right sides at the top of the feeding unit 4.
[0069] The feeding unit 4 includes an inner part 41 of the feeding unit frame and an outer part 42 of the feeding unit frame. The inner part 41 of the feeding unit 4 located inside the feeding unit frame is located below the adsorption assembly 34.
[0070] A tray 44 is placed on the veneer conveying device; a tray lifting device 45 is provided below the veneer conveyor belt 43 of the feeding unit 4 located inside the feeding unit frame 31. The provision of the tray lifting device 45 can reduce the stroke of the second linear telescopic device 39. The second linear telescopic device 39 is a hydraulic cylinder or an electric push rod.
[0071] As a preferred technical solution, the tray lifting device 45 is a scissor lift.
[0072] As a preferred technical solution, a number of through holes are vertically provided on the longitudinal plate 37, and each through hole passes through a conduit 321; the bottom end of each conduit 321 is connected to a suction cup 310, and the top end of each conduit 321 is connected to a hose 317.
[0073] As a preferred technical solution, the hose 317 is a corrugated pipe.
[0074] As a preferred technical solution, the vacuum pumping device 38 includes two vacuum pumping fans 318 respectively located at the front and rear ends of the top of the feeding unit frame 31, a longitudinally arranged connecting pipe 319. The two vacuum pumping fans 318 are connected to the connecting pipe 319, and the connecting pipe 319 is connected to each hose 317.
[0075] The feeding process includes the following steps:
[0076] Step 1: The feeding unit transports a stack of veneers into the feeding unit 3;
[0077] The second linear telescopic device 39 controls the suction cup 310 to move to the top surface of the stack of veneers, and the suction cup adsorbs a veneer;
[0078] Step 2: The adsorption component position adjustment device 33 drives the suction cup 310 to move in an arc upward, conveying the veneer to between the two longitudinal extrusion rollers 36 of the guide plate frame 32 that are away from the longitudinal extrusion roller pair of the feeding unit 4. The two longitudinal extrusion rollers 36 rotate to convey the veneer into the two longitudinal extrusion rollers 36 at the end of the guide plate frame 32 close to the feeding unit 4;
[0079] Step 3: The first linear telescopic device 35 controls the guide plate frame 32 to rotate along the end away from the transition guide frame 2, so that the end of the guide plate frame 32 close to the transition guide frame 2 is docked with a frame plate 22; the two longitudinal extrusion rollers 36 at the end of the guide plate frame 32 close to the feeding unit 4 rotate to send the veneer into the frame plate 22 of the transition guide frame 2, and the frame plate longitudinal transmission roller 23 of the frame plate 22 rotates to send the veneer into the horizontal drying layer 11 of the drying unit 1 flush with the frame plate 22;
[0080] Repeat this way to achieve the feeding action.
[0081] Embodiment 2. As Figure 21 shown, the difference between this embodiment and Embodiment 1 is that there is no tray lifting device 45 under the veneer conveyor belt 43 of the feeding unit 4 located inside the feeding unit frame 31.
Claims
1. A feeding system for an automatic veneer drying device, the automatic veneer drying device comprising a drying unit provided with a plurality of horizontal drying layers, each horizontal drying layer being provided with a plurality of longitudinally driving rollers for the horizontal drying layer with flush tops, and each longitudinally driving roller for the horizontal drying layer being connected to a driving device for the longitudinally driving roller of the horizontal drying layer, characterized in that: The feeding system comprises a transition guide frame, a feeding unit and a material supply unit; The transition guide frame comprises a transition guide frame body, and the transition guide frame body is provided with a number of frame plates equal to the number of feeding ends of the horizontal drying layers of the drying unit. The end of each frame plate close to the material supply unit corresponds to the feeding end of a horizontal drying layer respectively, the ends of each frame plate far from the material supply unit are close to each other and the height of the end of each frame plate far from the material supply unit is not lower than the end thereof close to the material supply unit; each frame plate is provided with longitudinally driving rollers for the frame plate with tops in the same plane; The feeding unit comprises a feeding unit frame body, a guide plate frame arranged on the feeding unit frame body, an adsorption assembly and an adsorption assembly position adjusting device; at both ends of the guide plate frame, there are respectively arranged pairs of longitudinally pressing rollers composed of two vertically arranged longitudinally pressing rollers with a gap equal to the thickness of one veneer; at least one longitudinally pressing roller in each pair of longitudinally pressing rollers is connected to a longitudinally pressing roller driving motor; The end of the guide plate frame far from the transition guide frame is hinged to the feeding unit frame body, and the end of the guide plate frame close to the transition guide frame is hinged to the feeding unit frame body through a first linear expansion device. By the expansion and contraction of the first linear expansion device, the end of the guide plate frame close to the transition guide frame is docked with the end of each frame plate far from the drying unit; The material supply unit is arranged below the adsorption assembly; The material supply unit is provided with a veneer conveying device; The veneer conveying device comprises veneer conveyor belts longitudinally arranged on the left and right sides at the top end of the material supply unit; The adsorption assembly comprises a longitudinal plate, a vacuum pumping device, a plurality of suction cups installed on the longitudinal plate through vertically arranged second linear expansion devices, and hoses equal in number to the suction cups; The adsorption assembly position adjusting device comprises two swing frames symmetrically arranged front and back and a swing frame driving device; the vacuum pumping device is arranged at the top end of the feeding unit frame body; each suction cup is connected to the vacuum pumping device through a hose; each swing frame comprises two pull plates of the same length perpendicular to the longitudinal plate and parallel to each other, and the bottom ends of the two pull plates are respectively hinged to a cross plate; the front and rear ends of the longitudinal plate are respectively hinged to the cross plate; the top ends of the two pull plates are respectively hinged to the feeding unit frame body.
2. The feeding system for an automatic veneer drying device according to claim 1, characterized in that: The swing frame driving device comprises a swing driving motor installed on the longitudinal plate, a driving shaft longitudinally arranged on the swing driving motor, and at the front and rear ends of the driving shaft, there are symmetrically connected rotating plates of the same length perpendicular to the driving shaft. The end of each rotating plate far from the driving shaft is hinged to an inclined plate of the same length and symmetrically arranged front and back perpendicular to the driving shaft, and each inclined plate is hinged to the swing frame. By the rotation of the driving shaft, the swing of the swing frame is realized.
3. The feeding system of an automatic veneer drying device as described in claim 1, characterized in that: The material supply unit comprises a part inside the feeding unit frame body and a part outside the feeding unit frame body, and the part of the material supply unit inside the feeding unit frame body is arranged below the adsorption assembly.
4. The feeding system of an automatic veneer drying device according to claim 3, characterized in that: A tray is placed on the veneer conveying device; a tray lifting device is provided below the veneer conveyor belt of the feeding unit located inside the feeding unit frame.
5. The feeding system of an automatic veneer drying device according to claim 4, characterized in that: The tray lifting device is a scissor lift.
6. The feeding system of an automated veneer drying device according to claim 1, characterized in that: A number of through holes are vertically provided on the longitudinal plate, and each through hole passes through a conduit; the bottom end of each conduit is connected to a suction cup (310), and the top end of each conduit is connected to a hose.
7. The feeding system of an automated veneer drying device as described in claim 6, characterized in that: The hose is a corrugated pipe.
8. The feeding system of an automatic veneer drying device according to claim 1, characterized in that: The vacuum pumping device includes two vacuum pumping fans respectively located at the front and rear ends of the top of the feeding unit frame, a longitudinally arranged connecting pipe, the two vacuum pumping fans are connected to the connecting pipe, and the connecting pipe is connected to each hose.
Citation Information
Patent Citations
Automatic veneer drying device
CN110595189A
Feeding system of automatic veneer drying device
CN213454759U