A high-efficiency hot air drying device for wood chips

Abstract

The present application relates to the technical field of artificial board preparation, and specifically discloses a wood chip efficient hot air drying device, which comprises a drying cylinder and a hot air source, the center of the end surface of the drying cylinder is provided with a disc, a hot air duct connected with the hot air source is arranged through the drying cylinder, a hollow rotating pipe is rotatably arranged on the outer wall of the hot air duct, a plurality of material scraping plates are uniformly arranged on the hollow rotating pipe, a material dropping port is formed on one end of the material scraping plate close to the hollow rotating pipe, and a material scattering plate sealing the lower end of the material dropping port is rotatably connected to one end of the lower end of the material dropping port close to the hollow rotating pipe; the wood chip efficient hot air drying device changes the internal structure of the traditional drum dryer, so that the wood chips can be dried faster, the drying uniformity of all wood chips can be improved, the drying effect of all wood chips is ensured, compared with directly passing in the axial hot air, the contact time of the hot air and the wood chips can be prolonged, and the heat energy loss in the hot air drying process can be reduced.

Description

Technical Field

[0001] This invention relates to the field of engineered wood panel manufacturing technology, and specifically discloses a high-efficiency hot air drying device for wood chips. Background Technology

[0002] In the production of engineered wood panels, the wood chips processed from the chip processing need to be dried before mixing with glue to control the moisture content of the wood chips and ensure the quality of the panels after subsequent hot pressing. Existing wood chip drying equipment is mainly a drum-type hot air dryer. During operation, wood chips are fed from one end of the drum. As the drum rotates, the wood chips are lifted by a feeding plate on the inner wall and then slide off the feeding plate. During the sliding and falling process, the wood chips come into contact with the axially fed hot air to complete the drying process.

[0003] For example, utility model patent application number 201220543837.7 discloses a drum dryer, which includes a hopper, a conveyor, an upper box, a lower box, a drum, a discharge end hood, and a main motor. The conveyor is fixed below the hopper, the drum is located between the upper and lower boxes, and the discharge end hood is located outside the discharge end of the drum. The drum is composed of an inlet drum, a middle drum, a discharge drum, a No. 1 support cylinder, a No. 2 support cylinder, and an inner end cover. In the process of drying wood chips, the drum dryer disclosed in this patent can lift and throw the wood chips down through the action of the material-pushing plate on the inner wall of the drum, and then use axial hot air for drying. Although the entire dryer achieves continuous drying of wood chips, the axially introduced hot air cannot make uniform contact with the wood chips from all directions, resulting in a slow drying speed and failing to guarantee the uniformity of drying of the wood chips. Meanwhile, the axially introduced hot air cannot circulate inside the drum for an extended period; it enters from one end and quickly exits from the other, resulting in significant heat loss during the wood chip drying process. Furthermore, the wood chips produced from the chip processing vary in size. Using the same drying method and time will lead to over-drying of smaller chips and incomplete drying of larger chips, making it impossible to accurately determine the moisture content of the dried wood chips and consequently affecting the quality of the final engineered wood product. Therefore, to address the technical problems and shortcomings of existing drum dryers in the wood chip drying process, this application proposes a newly designed high-efficiency hot air drying device for wood chips to solve the aforementioned issues. Summary of the Invention

[0004] The present invention aims to provide a high-efficiency hot air drying device for wood chips, so as to solve the problems of existing drum dryers being unable to fully contact the wood chips during the hot air drying process, resulting in low drying efficiency, poor drying uniformity, and serious heat loss during the drying process.

[0005] This invention is achieved through the following technical solution: A high-efficiency hot air drying device for wood chips includes a drying cylinder and a hot air source. The drying cylinder is horizontally fixed and has a discharge mechanism at the lower end, an exhaust pipe at the upper end, and a feeding mechanism at the rear end. A disc is provided at the center of both ends of the drying cylinder. A hot air duct connected to a hot air source is installed through the drying cylinder. A hollow rotating tube extending out of the disc is rotatably installed on the outer wall of the hot air duct. A rotating component is connected to the outer end of the hollow rotating tube. Several scraper plates are evenly arranged on the hollow rotating tube. A material discharge port is opened at the end of the scraper plate near the hollow rotating tube. A material spreading plate that seals the lower end of the material discharge port is rotatably connected to the lower end of the material discharge port near the hollow rotating tube by a pin. A swing bar is connected to the end of the pin, and a convex shaft facing the disc is connected to the end of the swing bar. The disc has a guide closed-loop groove that interacts with the convex shaft. The guide closed-loop groove is composed of an arc segment, a transition segment and a wave segment connected in sequence. Multiple arc-shaped air outlets are spaced apart along the axial direction on the hollow rotating tube between two adjacent scraper plates. The lower half of the hot air duct has a strip-shaped air outlet that is aligned with the arc-shaped air outlets.

[0006] During operation, the wood chip high-efficiency hot air drying equipment disclosed in this invention delivers the wood chips to be dried to the bottom of the drying cylinder by the feeding mechanism, and then starts the rotating component to make the hollow rotating tube rotate around the hot air duct inside the drying cylinder, while high-temperature air is continuously introduced into the hot air duct by the hot air source.

[0007] During the rotation of the hollow rotary tube, multiple scraper blades evenly arranged circumferentially scrape up the wood chips from the bottom of the drying cylinder. When the scraper blades reach a point beyond the horizontal (i.e., after rotating 90° clockwise from the bottom), the wood chips slide along the upper surface of the scraper blades towards the discharge port due to gravity. As rotation continues, the convex shaft, which initially interacts with the arc segment, enters the transition section. Through the action of the oscillating bars, the spreading plate rotates downwards, opening the discharge port and allowing the wood chips to fall onto it. Subsequently, the convex shaft enters the wave segment. Here, the wave segment guides the convex shaft, and combined with the action of the oscillating bars, the spreading plate oscillates up and down, evenly scattering the wood chips from various points.

[0008] At the same time, the arc-shaped air outlet on the hollow rotating pipe rotates to align with the strip-shaped air outlet, allowing the high-temperature air in the hot air duct to be discharged through the arc-shaped and strip-shaped air outlets. As it flows upward, it comes into full and even contact with the evenly scattered wood chips, allowing the wood chips to dry quickly under the action of the high-temperature air.

[0009] After repeating the scraping, even spreading, and hot air drying processes multiple times, the moisture in the wood chips will evaporate and be discharged from the drying cylinder through the exhaust pipe along with the hot air. Once the wood chips are dried to the set degree, the discharge mechanism is opened to discharge them, and then a new batch of wood chips to be dried is loaded and the above process is repeated.

[0010] As a further provision of the above scheme, the wave segment is radially convex and positioned horizontally within a range of 15 to 60° along the clockwise rotation direction, and the strip-shaped air outlet is axially positioned horizontally within a range of 30 to 45° along the counterclockwise rotation direction.

[0011] The design of the wave-shaped section and the position of the strip-shaped air outlet ensures that the spreading plate only rotates downwards as the wood chips on the scraper begin to slide down, and then the spreading plate swings up and down to smoothly complete the spreading action of the wood chips. At the same time, the strip-shaped air outlet can be aligned with the arc-shaped air outlet, allowing the high-temperature air in the hot air duct to be discharged during the material spreading process, ensuring that the hot air can have full and complete contact with the material during the spreading process, thereby improving the drying effect.

[0012] As a further provision of the above scheme, multiple material discharge ports are arranged side by side along the axial direction, and a receiving groove is provided on the lower surface of the scraper plate, which is aligned with the material discharge ports. The material spreading plate is rotatably disposed in the receiving groove.

[0013] As a further provision of the above scheme, the hot air duct is arranged through the disc, and the outer end of the hot air duct is fixed by connecting with the upright. The hot air duct is rotatably sleeved on the hot air duct and rotatably connected to the bearing on the disc.

[0014] As a further provision of the above scheme, the rotating assembly includes a motor, and a transmission component is provided between the motor and the outer end of the hollow rotating tube. The transmission component is one of a gear, a transmission belt, or a chain.

[0015] As a further feature of the above solution, the discharge mechanism includes a discharge port located at the lower end of the drying cylinder, an arc-shaped sealing plate rotatably connected to the discharge port, and a telescopic drive component connected to the arc-shaped sealing plate.

[0016] As a further provision of the above scheme, the feeding mechanism includes a hopper connected to the rear end of the drying cylinder, and the lower end of the inner cavity of the hopper is connected to the drying cylinder. An arc-shaped gate is attached to the outer wall of the drying cylinder, and a driving component is provided on the hopper to drive the arc-shaped gate to rotate against the outer wall of the drying cylinder and close the connection between the hopper and the drying cylinder.

[0017] As a further provision of the above scheme, two drying cylinders are arranged side by side, and the hot air ducts in the two drying cylinders are connected, the hollow rotating pipes in the two drying cylinders are connected to each other, and a feeding device is provided above the rear side of the two drying cylinders.

[0018] As a further provision of the above scheme, the feeding device includes a conveying cylinder and a screen cylinder arranged concentrically. The screen cylinder is located inside the conveying cylinder and one end of the screen cylinder is connected to a discharge part. The other end of the screen cylinder is connected to a feeding hopper. The conveying cylinder is provided with two feeding channels that are respectively connected to the corresponding hoppers. The conveying cylinder above the two feeding channels is provided with two sets of screen holes with different apertures. The conveying cylinder is provided with an auger conveyor blade, and the end of the auger conveyor blade is connected to a second motor.

[0019] This invention, through an improved design of the above-mentioned technical solution, uses a feeding device to screen the wood chips according to their size during the conveying process, allowing wood chips of different sizes to enter two drying cylinders for hot air drying. Furthermore, the switching time between the corresponding drying cylinders is controlled according to the drying speed of the corresponding wood chips, so that larger wood chips can have a longer drying time to ensure complete drying, while smaller wood chips can have a shorter drying time to avoid over-drying, ensuring that all wood chips are dried to the preset degree.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows: The high-efficiency hot air drying equipment for wood chips disclosed in this invention changes the internal structure of traditional drum dryers. During operation, the wood chips are first scraped up and then slide down the scraper to the spreading plate. The wood chips are then evenly spread from different positions by the reciprocating oscillation of the spreading plate. During the process of spreading the wood chips, they come into full contact with the high-temperature air discharged from the circumference. This not only allows the wood chips to dry faster, but also improves the drying uniformity of all wood chips, ensuring the drying effect of all wood chips.

[0021] The drying equipment disclosed in this invention is confined to a fan-shaped area between two adjacent scraper blades after hot air is discharged, and then comes into contact with the scattered wood chips for a longer period of time. Finally, when the hot air rotates to the upper end of the inner cavity of the drying cylinder in the fan-shaped area, it is connected to the exhaust pipe to realize the discharge of hot and humid gas. Compared with directly introducing axial hot air, it can prolong the contact time between hot air and wood chips, improve the hot air drying effect, and reduce the heat energy loss during the hot air drying process.

[0022] The present invention further includes two drying cylinders, and then a feeding device with a screening function is used to transport the wood chip raw materials. During the transportation process, the wood chips are screened according to their size, so that wood chips of different sizes enter the two drying cylinders for hot air drying of appropriate duration. This solves the problem that existing dryers use the same hot air drying time, which leads to over-drying of small-sized wood chips and incomplete drying of large-sized wood chips. This allows the moisture content of the dried wood chips to be effectively controlled, ensuring the drying effect of the wood chips. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a three-dimensional structural diagram of the present invention from a first angle; Figure 2 This is a schematic diagram of the second-angle three-dimensional structure of the present invention; Figure 3 This is a three-dimensional structural diagram of the drying cylinder, hopper, drive assembly, etc. in this invention; Figure 4 This is a three-dimensional structural diagram of the interior of the drying cylinder in this invention; Figure 5 This is a schematic diagram of the internal planar structure of the drying cylinder in this invention; Figure 6 This is a three-dimensional structural diagram of the hot air duct, hollow rotary tube, scraper, etc. in this invention; Figure 7 For the present invention Figure 5 Enlarged structural diagram at point A; Figure 8 This is a schematic diagram of the internal planar structure in Embodiment 2 of the present invention; Figure 9 This is a three-dimensional structural diagram of the feeding device in this invention. Detailed Implementation

[0025] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0026] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The following will refer to the appendix... Figures 1-9 This application will be described in detail with reference to the embodiments. Example 1

[0027] Example 1 discloses a high-efficiency hot air drying device for wood chips, as shown in the attached figure. Figure 1 Appendix Figure 3 and attached Figure 4 The system includes a horizontally positioned drying cylinder 1, the lower end of which is fixedly mounted on the upper surface of a base plate 3 via support legs 2. A discharge port is provided at the lower end of the drying cylinder 1, and an arc-shaped sealing plate 4 is rotatably connected to the discharge port. The arc-shaped sealing plate 4 is opened and closed by a telescopic drive component 5 mounted on the base plate 3. An exhaust pipe 6 is connected to the upper end of the drying cylinder 1, allowing the hot and humid air generated during the wood chip drying process to be directionally discharged through the exhaust pipe 6.

[0028] A hopper 7 is provided at the rear end of the drying cylinder 1, and the lower end of the inner cavity of the hopper 7 is connected to the drying cylinder 1. An arc-shaped gate 8 is attached to the outer wall of the drying cylinder 1, and a drive assembly 9 is provided on the hopper 7 to drive the arc-shaped gate 8 to rotate against the outer wall of the drying cylinder 1. Specifically, the drive assembly 9 includes a rotating shaft 901 rotatably mounted on the upper end of the hopper 7, one end of which is connected to a first motor 902. A gear 903 is provided on the rotating shaft 901, and an arc-shaped rack 904 that meshes with the gear 903 is provided on the outer surface of the arc-shaped gate 8. Under the action of the drive assembly 9, the connection between the hopper 7 and the drying cylinder 1 can be opened to complete the feeding action.

[0029] Reference Appendix Figure 4 Appendix Figure 5 Appendix Figure 6 and attached Figure 7 A disc body 10 is provided at the center of each end face of the drying cylinder 1, and a hot air duct 11 is provided between the two disc bodies 10 along the central axis. One end of the hot air duct 11 is sealed, and the other end is connected to a hot air blower 13 through an air supply pipe 12. At the same time, the end of the hot air duct 11 extending out of the drying cylinder 1 is fixedly connected to the upright frame 14 on the base plate 3, so that the hot air duct 11 remains relatively fixed after passing through the drying cylinder 1. A hollow rotating tube 15 is rotatably attached to the outer surface of the hot air duct 11. Both ends of the hollow rotating tube 15 are rotatably connected to the bearings at the center of the disc body 10. Then, a rotating component 16 is connected to the end of the hollow rotating tube 15 extending out of the disc body 10. The rotating component can be a motor + gear, a motor + transmission belt, or a motor + chain, etc. In this figure, the rotating component 16 is a motor + transmission belt, so that the hollow rotating tube 15 can rotate clockwise against the outer wall of the hot air duct 11 under the action of the rotating component 16.

[0030] Two to four scraper blades 17 are evenly connected circumferentially to the outer wall of the hollow rotating tube 15, and the radial distance between the end of the scraper blade 17 and the inner wall of the drying cylinder 1 does not exceed 3mm, so that the scraper blade 17 can scrape up the wood chips at the bottom of the drying cylinder 1 during rotation. Multiple dropping ports 171 are axially spaced at one end of the scraper blade 17 near the hollow rotating tube 15, and a collection groove 172 is formed on the lower surface of the scraper blade 17 at the corresponding dropping port 171 position. Then, a spreading plate 173 is rotatably connected to the collection groove 172 near the hollow rotating tube 15 by a pin, and when the spreading plate 173 is closed in the collection groove 172, it can completely seal the bottom of all dropping ports 171.

[0031] A swing bar 174 is fixedly connected to the outer end of a pin on the spreading plate 173, and a convex shaft 175 facing the disc body 10 is connected to the end of the swing bar 174. A guide closed-loop groove 20 is formed on the disc body 10, which interacts with the convex shaft 175. The guide closed-loop groove 20 is composed of an arc segment 201, a radially convex wave segment 202, and a transition segment 203, and the arc segment 201 and the wave segment 202 are connected by the transition segment 203. Furthermore, when designing the position of the guide closed-loop groove 20, the wave segment 202 should be located horizontally and between 15° and 60° in the clockwise rotation direction. When the convex shaft 175 is located in the arc section 201, the oscillating bar 174 allows the spreading plate 173 to be closed in the receiving groove 172; when the convex shaft 175 is located in the transition section 203, the oscillating bar 174 allows the spreading plate 173 to rotate out of the receiving groove 172; when the convex shaft 175 is located in the wave section 202, the oscillating bar 174 not only allows the spreading plate 173 to rotate out of the receiving groove 172, but also allows the spreading plate 173 to swing up and down around the pin shaft, thereby evenly spreading the wood chips on the upper surface of the spreading plate 173 along different trajectories.

[0032] Reference Appendix Figure 6 Multiple arc-shaped air outlets 151 are spaced axially on the hollow rotating pipe 15 between each pair of adjacent scraper blades 17, and strip-shaped air outlets 111 corresponding to the arc-shaped air outlets 151 are also provided on the hot air duct 11. Specifically, the strip-shaped air outlets 111 are arranged along the axial direction of the hot air duct 11 and are opened at a horizontal angle between -30° and -45° in the clockwise rotation direction.

[0033] In the operation of the high-efficiency hot air drying equipment for wood chips disclosed in Embodiment 1, the arc-shaped gate 8 is opened so that all the wood chips to be dried in the hopper 7 slide down to the lower end of the inner cavity of the drying cylinder 1, and then the arc-shaped gate 8 is closed.

[0034] Next, the hot air blower 13 is started to introduce hot air into the hot air duct 11, and the rotating component 16 is started to make the hollow rotating tube 15 fit against the outer wall of the hot air duct 11 and rotate clockwise. During the rotation of the hollow rotating tube 15, the scraper 17 rotates synchronously. When the scraper 17 passes the bottom of the drying cylinder 1, it can scrape up all the wood chips. Then, after the scraper 17 continues to rotate more than 90°, the wood chips on the scraper 17 begin to slide to one side of the hollow rotating tube 15 due to gravity. Then, when the convex shaft 175 corresponding to the scraper 17 starts to act with the transition section 203 in the guide closed loop groove 20, the spreading plate 173 rotates out from the receiving groove 172, and then the wood chips fall onto the upper surface of the spreading plate 173 through the drop port 171. Subsequently, when the convex shaft 175 acts with the wave section 202, the spreading plate 173 begins to swing up and down, thereby evenly scattering the wood chips from different positions on the upper surface of the spreading plate 173.

[0035] Meanwhile, the arc-shaped air outlet 151 below the scraper 17 begins to align with the strip-shaped air outlet 111, forming a row of uniformly spaced air outlets. High-temperature air from the hot air duct 11 is discharged from these outlets and directly acts on the wood chips during the uniform spreading process, ensuring effective and comprehensive contact with all wood chips and improving drying efficiency. After running for a period of time, once the wood chips have dried to the set moisture content, the telescopic drive 5 controls the arc-shaped sealing plate 4 to open, allowing the dried wood chips to be discharged from the outlet at the bottom of the drying cylinder 1. Example 2

[0036] Example 2 discloses a high-efficiency hot air drying device for wood chips that is further improved based on the technical solution in Example 1. The similarities between it and Example 1 will not be described again.

[0037] Reference Appendix Figure 1 Appendix Figure 2 Appendix Figure 8 and attached Figure 9 In this embodiment 2, there are two drying cylinders 1 arranged side by side. The hot air duct 11 and the hollow rotating tube 15 both pass through the two drying cylinders 1 and are driven by a rotating component 16. Then, a set of scraper 17 and corresponding matching parts are provided on the hollow rotating tube 15 in each drying cylinder 1.

[0038] Meanwhile, a feeding device 18 is provided above the rear side of the two drying cylinders 1. The feeding device 18 includes a conveying cylinder 181 arranged parallel to the drying cylinder 1, and a screen cylinder 182 with one end extending out is concentrically installed inside the conveying cylinder 181. A feeding hopper 183 connected to one end of the screen cylinder is provided at the upper end of the conveying cylinder 181, and a discharge part 184 is provided on the lower surface of the other end of the screen cylinder 182 extending out of the conveying cylinder 181. The lower surface of the conveying cylinder 181 has two discharge channels 185 at both ends, which are respectively connected to the two hoppers 7. Screen holes 186 with different diameters are opened on the screen cylinder 182 at the positions corresponding to the two discharge channels 185. Among them, the screen hole 186 near the feeding hopper 183 has a small diameter, and the other end has a large diameter. Finally, an auger conveyor blade 187 is also provided inside the screen cylinder 182, and a second motor 188 is connected to the end of the auger conveyor blade 187.

[0039] In this embodiment 2, the feeding device 18 is used to transport the wood chips to be dried, and during the transport process, the chips are screened according to size, so that they enter different drying cylinders 1 for hot air drying. The unscreened wood chips, due to their larger size, need to undergo secondary crushing after discharge. After the wood chips are screened, they enter two different drying cylinders 1. The material exchange time of the two drying cylinders 1 can be set according to the size of the wood chips, so that smaller wood chips can be discharged after a shorter running time, while larger wood chips need to be discharged after a longer running time, ensuring the drying effect.

[0040] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-efficiency hot air drying device for wood chips, comprising a drying drum and a hot air source, characterized in that, The drying cylinder is fixed horizontally, and a discharge mechanism is provided at the lower end of the drying cylinder, an exhaust pipe is provided at the upper end, and a feeding mechanism is provided at the rear end. A disc is provided at the center of both ends of the drying cylinder. A hot air duct connected to a hot air source is installed through the drying cylinder. A hollow rotating tube extending out of the disc is rotatably installed on the outer wall of the hot air duct. A rotating component is connected to the outer end of the hollow rotating tube. Several scraper plates are evenly arranged on the hollow rotating tube. A material discharge port is opened at the end of the scraper plate near the hollow rotating tube. A material spreading plate that seals the lower end of the material discharge port is rotatably connected to the lower end of the material discharge port near the hollow rotating tube by a pin. A swing bar is connected to the end of the pin, and a convex shaft facing the disc is connected to the end of the swing bar. The disc has a guide closed-loop groove that interacts with the convex shaft. The guide closed-loop groove is composed of an arc segment, a transition segment and a wave segment connected in sequence. Multiple arc-shaped air outlets are spaced apart along the axial direction on the hollow rotating tube between two adjacent scraper plates. The lower half of the hot air duct has a strip-shaped air outlet that is aligned with the arc-shaped air outlets.

2. The high-efficiency hot air drying equipment for wood chips according to claim 1, characterized in that, The wave segment is radially convex and positioned horizontally within a 15-60° range along the clockwise rotation direction. The strip-shaped air outlet is axially positioned horizontally within a 30-45° range along the counterclockwise rotation direction.

3. The high-efficiency hot air drying equipment for wood chips according to claim 1, characterized in that, The material discharge port is provided in a plurality of parallel openings along the axial direction, and the lower surface of the scraper is provided with a receiving groove aligned with the material discharge port. The material spreading plate is rotatably disposed in the receiving groove.

4. The high-efficiency hot air drying equipment for wood chips according to claim 1, characterized in that, The hot air duct is installed through the disc, and the outer end of the hot air duct is fixed by connecting to the upright. The hot air duct is rotatably sleeved on the hot air duct and rotatably connected to the bearing on the disc.

5. The high-efficiency hot air drying equipment for wood chips according to claim 4, characterized in that, The rotating assembly includes a motor, and a transmission component is provided between the motor and the outer end of the hollow rotating tube. The transmission component is one of a gear, a transmission belt, or a chain.

6. The high-efficiency hot air drying equipment for wood chips according to claim 1, characterized in that, The discharge mechanism includes a discharge port located at the lower end of the drying cylinder, an arc-shaped sealing plate rotatably connected to the discharge port, and a telescopic drive component connected to the arc-shaped sealing plate.

7. The high-efficiency hot air drying equipment for wood chips according to claim 1, characterized in that, The feeding mechanism includes a hopper connected to the rear end of the drying cylinder, and the lower end of the inner cavity of the hopper is connected to the drying cylinder. An arc-shaped gate is attached to the outer wall of the drying cylinder, and a drive component is provided on the hopper to drive the arc-shaped gate to rotate against the outer wall of the drying cylinder and close the connection between the hopper and the drying cylinder.

8. The high-efficiency hot air drying equipment for wood chips according to claim 7, characterized in that, Two drying cylinders are arranged side by side, and the hot air ducts in the two drying cylinders are connected. The hollow rotating pipes in the two drying cylinders are connected to each other, and a feeding device is provided above the rear side of the two drying cylinders.

9. The high-efficiency hot air drying equipment for wood chips according to claim 8, characterized in that, The feeding device includes a concentrically arranged conveying cylinder and a screen cylinder. The screen cylinder is located inside the conveying cylinder and one end of the screen cylinder is connected to a discharge section. The other end of the screen cylinder is connected to a feeding hopper. The conveying cylinder is provided with two feeding channels that are respectively connected to the corresponding hoppers. The conveying cylinder above the two feeding channels is provided with two sets of screen holes with different apertures. The conveying cylinder is provided with an auger conveyor blade, and the end of the auger conveyor blade is connected to a second motor.

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