Wood powder recycling and granulating system

Abstract

The invention discloses a wood powder recycling and granulating system which comprises a screw feeder, a preheating cooking pot, a double-roller type grinding machine, a conveying stirring cage, a granulator and a cyclone dust collector, the screw feeder is arranged on the upper portion of the preheating cooking pot, and the preheating cooking pot is connected with the double-roller type grinding machine through a first discharging valve; the double-roller type grinding machine is connected with a conveying stirring cage through a second discharging valve, and an outlet of the conveying stirring cage is connected with a granulating machine; a first steam inlet pipe is arranged at the lower part of the preheating cooking pot, and a first steam exhaust pipe is arranged at the top; a second steam inlet pipe is arranged on the lower portion of the double-roller type grinding machine, a second steam exhaust pipe is arranged on the top of the double-roller type grinding machine, the first steam exhaust pipe and the second steam exhaust pipe are connected with a cyclone dust collector, the cyclone dust collector is connected with a fan through an air inducing pipe, and an outlet of the fan is connected with a diffusing pipe. The wood chip recycling device is short in production process, simple in process, small in equipment investment and capable of effectively utilizing waste wood chips generated by wood processing and creating better economic benefits for enterprises.

Description

Technical Field

[0001] The present invention relates to the technical field of wood chip recycling, and more specifically, it relates to a wood powder recycling and granulating system. Background Art

[0002] During the floor processing, a lot of wood chips are generated. These wood chips accumulate in the workshop, occupying space and affecting the environment. Therefore, most enterprises sell these wood chips at a low price to downstream enterprises and rarely recycle them by themselves. Although this solves the problems of site stacking and environmental pollution, it does not form a good circular development model and reduces the economic benefits of the enterprises. Some enterprises use these wood chips to make organic fertilizers, artificial boards and feeds. Although these can increase the enterprise benefits, the equipment investment is large, the production process is long, and the technology is complex, which also discourages many enterprises. Therefore, it is necessary to develop a wood chip recycling device with a short production process, simple technology, small equipment investment, compact structure, small volume, small floor area, quick results, and can effectively utilize the waste wood chips generated by floor processing to create better economic benefits for enterprises. Summary of the Invention

[0003] Aiming at the deficiencies of the existing technology, the purpose of the present invention is to provide a wood chip recycling device with a short production process, simple technology, small equipment investment, compact structure, small volume, small floor area, quick results, and can effectively utilize the waste wood chips generated by wood processing to create better economic benefits for enterprises.

[0004] The above technical purpose of the present invention is achieved through the following technical solutions: A wood powder recycling and granulating system, characterized in that: it includes a screw feeder, a preheating and cooking tank, a pair-roll grinder, a conveying auger, a granulator and a cyclone dust collector. The screw feeder is arranged on the upper part of the preheating and cooking tank. A first discharge valve is arranged at the bottom of the preheating and cooking tank. A second discharge valve is arranged at the bottom of the pair-roll grinder. The preheating and cooking tank is connected to the pair-roll grinder through the first discharge valve. The pair-roll grinder is connected to the conveying auger through the second discharge valve. The outlet of the conveying auger is connected to the granulator; It also includes a material receiving device. The material receiving device includes a collecting pipe and a frame. One end of the collecting pipe extends above the wood processing equipment for sucking the wood chips and then sending the wood chips into the screw feeder. The frame is fixed on the wall or the roof of the house, and the collecting pipe is arranged on the frame.

[0005] The present invention is further arranged as: The granulator includes an outer cylinder. An inner cylinder is arranged inside the outer cylinder. A feeding port is arranged on the inner cylinder close to the side of the conveying auger. The feeding port passes through the outer cylinder and is connected to the outlet of the conveying auger. An outlet is arranged on one side of the bottom of the outer cylinder. A horizontal shaft passes through the middle of the inner cylinder. Both ends of the horizontal shaft are rotationally connected to the outer cylinder through bearings. The right end of the horizontal shaft passes through the outer cylinder and is connected to a driving motor. A spiral blade is arranged in the middle of the horizontal shaft.

[0006] The present invention is further configured as follows: a first steam inlet pipe is provided at the lower conical pipe section of the preheating and cooking tank, and a first exhaust pipe is provided at the top; a second steam inlet pipe is provided at the conical pipe section of the pair-roll grinder, and a second exhaust pipe is provided at the top. The first exhaust pipe and the second exhaust pipe are connected to a cyclone dust collector. The outlet of the cyclone dust collector is connected to a fan through an air draft pipe, and the outlet of the fan is connected to a blow-off pipe. On the circumferential surface of the two rollers of the pair-roll grinder, teeth that mesh with each other are evenly arranged. The cross-sectional shape of the teeth is trapezoidal, and the teeth are made of wear-resistant stainless steel plates.

[0007] The present invention is further configured as follows: a material guiding plate and a plurality of material guiding cones are provided in the preheating and cooking tank, and safety valves are provided at the tops of both the preheating and cooking tank and the pair-roll grinder.

[0008] The present invention is further configured as follows: the left half of the inner cylinder is a closed cylinder body, openings are provided on the barrel wall of the right half and the bottom plate of the inner cylinder, a circumferential cutting knife is provided outside the barrel wall of the right half, a bottom cutting knife is provided on the right side of the bottom plate of the inner cylinder, and both the circumferential cutting knife and the bottom cutting knife are fixedly installed on a horizontal shaft through a tool rest.

[0009] The present invention is further configured as follows: it further includes a base and a sawdust collection box and a cylindrical sawdust compression box arranged side by side on the base; the sawdust collection box is connected to the rear end of the air draft channel.

[0010] The present invention is further configured as follows: the inlet at the upper part of the sawdust compression box is connected to the outlet at the bottom of the sawdust collection box; a driving motor is installed above the sawdust compression box, and a rotating shaft fixed on the driving shaft of the driving motor extends into the sawdust compression box; a sector-shaped pressing plate is horizontally fixed at the bottom end of the rotating shaft; a hydraulic cylinder is installed on the base on one side of the sawdust compression box, and the piston rod of the hydraulic cylinder is fixedly connected to the mounting bracket of the driving motor.

[0011] The present invention is further configured as follows: a "convex"-shaped connecting pipe that rotates counterclockwise by [specific degrees] is also connected between the air draft channel and the sawdust compression box. The upper port of the connecting pipe is an air exhaust port, and its lower port is connected to the sawdust collection box.

[0012] The present invention is further configured as follows: the sawdust compression box extends into the interior of the base, and a horizontal channel communicating with the inner bottom of the sawdust compression box is provided in the base; two push-pull plates are provided at both ends of the sawdust compression box in the channel, and a push plate is fixedly extended upward from the front side surface in the rotating direction of the pressing plate.

[0013] In summary, the present invention has the following beneficial effects: Through the preheating cooking tank, the pair-roll grinder and the granulator, the waste wood chips generated by wood processing are conveyed into the preheating cooking tank through the screw feeder, and then steam is introduced into the tank. The high-temperature and high-pressure steam softens the wood chips, and then enters the pair-roll grinder. The softened raw materials are compressed, stretched, sheared, twisted, impacted, ground and hydrolyzed by the mutually meshing rollers to separate the fibers, and then enter the granulator for granulation to form bio-pellet fuels. These fuels are then returned to the boiler for use or sold; the production process of the present invention is short, the process is simple, the equipment investment is small, the structure is compact, the volume is small, the floor area is small, the effect is quick, and it can make full use of the waste wood chips generated by wood processing, make bio-pellet fuels and then reuse them, creating good economic benefits for the enterprise. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic diagram of the overall structure of the present invention; Figure 2 is a schematic diagram of the main structure of the equipment of the present invention; Figure 3 is a system flow chart of the present invention.

[0015] In the figure: 1, granulator; 11, discharge port; 12, outer cylinder; 13, blanking port; 14, inner cylinder; 15, circumferential cutting knife; 16, bottom cutting knife; 17, cylinder bottom plate; 18, horizontal axis; 19, spiral blade; 110, drive motor; 111, tool holder; 2, conveying auger; 3, collecting pipe; 31, second discharge valve; 32, first discharge valve; 4, pair-roll grinder; 41, roller; 51, first steam inlet pipe; 52, second steam inlet pipe; 6, preheating cooking tank; 61, material guiding cone; 62, material guiding plate; 63, safety valve; 7, screw feeder; 81, second exhaust pipe; 82, first exhaust pipe; 83, cyclone dust collector; 84, induced air pipe; 85, relief pipe; 86, fan. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] The present invention will be described in detail below with reference to the drawings and embodiments.

[0017] As Figure 1As shown in the figure, the present invention provides a technical solution: a wood powder recycling granulation system, including a screw feeder 7, a preheating and cooking tank 6, a pair-roll grinder 4, a conveying auger 2, a granulator 1 and a cyclone dust collector 83. The screw feeder 7 is arranged on the upper part of the preheating and cooking tank 6. A first discharge valve 32 is arranged at the bottom of the preheating and cooking tank 6. A second discharge valve 31 is arranged at the bottom of the pair-roll grinder 4. The preheating and cooking tank 6 is connected to the pair-roll grinder 4 through the first discharge valve 32. The pair-roll grinder 4 is connected to the conveying auger 2 through the second discharge valve 31. The outlet of the conveying auger 2 is connected to the granulator 1. A first steam inlet pipe 51 is arranged on the lower conical pipe section of the preheating and cooking tank 6, and a first exhaust pipe 82 is arranged at the top. A second steam inlet pipe 52 is arranged on the conical pipe section of the pair-roll grinder 4, and a second exhaust pipe 81 is arranged at the top. The first exhaust pipe 82 and the second exhaust pipe 81 are connected to the cyclone dust collector 83. The outlet of the cyclone dust collector 83 is connected to a blower 86 through an air draft pipe 84, and the outlet of the blower 86 is connected to a blow-off pipe 85.

[0018] As Figure 1 shown in the figure, the granulator 1 includes an outer cylinder 12. An inner cylinder 14 is arranged inside the outer cylinder 12. A feeding port 13 is arranged on the side of the inner cylinder 14 close to the conveying auger 2. The feeding port 13 passes through the outer cylinder 12 and is connected to the outlet of the conveying auger 2. An outlet 11 is arranged on one side of the bottom of the outer cylinder 12. A transverse shaft 18 penetrates through the middle of the inner cylinder 14. Both ends of the transverse shaft 18 are rotationally connected to the outer cylinder 12 through bearings. The right end of the transverse shaft 18 passes through the outer cylinder 12 and is connected to a driving motor 110. A spiral blade 19 is arranged in the middle of the transverse shaft 18. The left half of the inner cylinder 14 is a sealed cylinder body. Openings are provided on the barrel wall of the right half and the barrel bottom plate 17 of the inner cylinder 14. A circumferential cutter 15 is arranged outside the barrel wall of the right half. A bottom cutter 16 is arranged on the right side of the barrel bottom plate 17 of the inner cylinder 14. Both the circumferential cutter 15 and the bottom cutter 16 are fixedly installed on the transverse shaft 18 through a tool rest 111.

[0019] As Figure 1As shown, on the circumferences of the surfaces of the two rollers 41 of the pair-roller grinder 4, teeth that mesh with each other are evenly arranged in the circumferential direction. The cross-sectional shape of the teeth is trapezoidal, and the teeth are made of wear-resistant stainless steel plates. The teeth are made into a trapezoidal structure with a large surface at the root, which can increase the welding strength with the roller 41. The teeth can ensure that the incoming material can be fully compressed, stretched, sheared, twisted, impacted, and ground; the teeth made of wear-resistant stainless steel plates improve their wear resistance and increase the service life of the teeth; a material guide plate 62 and a plurality of material guide cones 61 are arranged in the preheating and cooking tank 6. The material guide plate 62 can enable the material coming in from the screw feeder 7 to centrally fall on the center of the material guide cone 61, preventing material deviation or blockage; the material guide cone 61 has the function of lifting the material, which can disperse the wood chips and reduce the resistance of steam entering the wood chip pile, making the cooking effect better; safety valves 63 are arranged at the tops of both the preheating and cooking tank 6 and the pair-roller grinder 4. When the pressure in the tank exceeds the set value, the safety valve 63 automatically relieves the pressure, which is beneficial to ensuring the safety of personnel and equipment.

[0020] As Figure 1 shown, in another embodiment of the present invention, the device includes a base 10, a wood chip collection box and a cylindrical wood chip compression box arranged side by side on the base 10; the wood chip collection box is connected to the rear end of the air guiding channel; the inlet at the upper part of the wood chip compression box is connected to the outlet at the bottom of the wood chip collection box; a driving motor 110 is installed above the wood chip compression box, and a rotating shaft fixed on the driving shaft of the driving motor 110 extends into the wood chip compression box; a sector-shaped pressing plate is horizontally fixed at the bottom end of the rotating shaft; a hydraulic cylinder is installed on one side of the wood chip compression box on the base 10, and the piston rod of the hydraulic cylinder is fixedly connected to the mounting bracket of the driving motor 110. A "convex"-shaped connecting pipe that rotates counterclockwise by a certain degree is also connected between the air guiding channel and the wood chip compression box. The upper port of the connecting pipe is an air outlet, and its lower port is connected to the wood chip collection box. A push plate is fixedly extended upward from the front side surface in the rotating direction of the pressing plate. A vibration motor 100 is also installed on the base 10. The wood chip compression box extends into the interior of the base 10, and a horizontal channel communicating with the inner bottom of the wood chip compression box is opened in the base 10; two push-pull plates are arranged at both ends of the wood chip compression box in the channel.

[0021] When the present invention works, first, wood chips are collected through the collecting pipe 3 of the material receiving device. The wood chips are transported along with the collecting pipe 3 to the screw feeder 7, and then transported by the screw feeder 7. Guided by the guide plate 62 and the guide cone 61, they enter the preheating and cooking tank 6. During the falling process, they continuously exchange heat with the steam entering from the first steam inlet pipe 51. After the steam conducts heat to the wood chips, it continues to rise and is discharged from the first exhaust pipe 82 into the cyclone dust collector 83; while the heated material falls to the bottom of the preheating and cooking tank 6 for further cooking. After the cooking reaches the specified time, it is discharged to the pair-roller grinder 4 by the first discharge valve 32. After the material enters the pair-roller grinder 4, it is compressed, stretched, sheared, twisted, impacted, and ground by the meshing teeth on the roller 41 to separate the material fibers. Then the fiberized material is sent to the inner cylinder 14 of the granulator 1 by the conveying auger 2. Under the continuous stirring and conveying of the spiral blade 19, the material enters the right half of the inner cylinder 14 and one side of the cylinder bottom plate 17. After being continuously extruded by the spiral blade 19, the compacted material is extruded from the opening. Then the strip-shaped material coming out of the cylinder bottom plate 17 is cut off by the bottom cutting knife installed on the right side of the cross shaft 18, and the strip-shaped material in the right half of the inner cylinder 14 is cut off by the circumferential cutting knife 15. The cut material falls to the bottom of the outer cylinder 12 and is finally discharged from the discharge port 11. This device has the advantages of compact structure, small volume, small floor area, short process flow, and quick effect.

[0022] The above is only the preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions falling within the idea of the present invention belong to the protection scope of the present invention. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present invention, several improvements and refinements should also be regarded as within the protection scope of the present invention.

Claims

1. A wood powder recycling and granulation system, characterized in that: It includes a spiral feeder (7), a preheating and cooking tank (6), a pair-roll grinder (4), a conveying auger (2), a granulator (1) and a cyclone dust collector (83). The spiral feeder (7) is arranged at the upper part of the preheating and cooking tank (6). A first discharge valve (32) is arranged at the bottom of the preheating and cooking tank (6). A second discharge valve (31) is arranged at the bottom of the pair-roll grinder (4). The preheating and cooking tank (6) is connected to the pair-roll grinder (4) through the first discharge valve (32). The pair-roll grinder (4) is connected to the conveying auger (2) through the second discharge valve (31). The outlet of the conveying auger (2) is connected to the granulator (1). It also includes a material receiving device. The material receiving device includes a collecting pipe (3) and a frame body. One end of the collecting pipe (3) extends above the wood processing equipment for sucking sawdust and then sending the sawdust into the spiral feeder (7). The frame body is fixed on the wall or the roof. The collecting pipe (3) is arranged on the frame body.

2. The wood powder recycling and granulation system according to claim 1, wherein: The granulator (1) includes an outer cylinder (12). An inner cylinder (14) is arranged inside the outer cylinder (12). A feeding port (13) is arranged on the side of the inner cylinder (14) close to the conveying auger (2). The feeding port (13) passes through the outer cylinder (12) and is connected to the outlet of the conveying auger (2). An outlet (11) is arranged on one side of the bottom of the outer cylinder (12). A horizontal shaft (18) runs through the middle of the inner cylinder (14). Both ends of the horizontal shaft (18) are rotationally connected to the outer cylinder (12) through bearings. The right end of the horizontal shaft (18) passes through the outer cylinder (12) and is connected to a driving motor (110). A spiral blade (19) is arranged in the middle of the horizontal shaft (18).

3. The wood powder recovery and granulation system according to claim 2, wherein: A first steam inlet pipe (51) is arranged in the lower conical pipe section of the preheating and cooking tank (6), and a first exhaust pipe (82) is arranged at the top. A second steam inlet pipe (52) is arranged in the conical pipe section of the pair-roll grinder (4), and a second exhaust pipe (81) is arranged at the top. The first exhaust pipe (82) and the second exhaust pipe (81) are connected to the cyclone dust collector (83). The outlet of the cyclone dust collector (83) is connected to a fan (86) through a draft tube (84). The outlet of the fan (86) is connected to a discharge pipe (85). Teeth that mesh with each other are evenly arranged circumferentially on the surfaces of the two rollers (41) of the pair-roll grinder (4). The cross-sectional shape of the teeth is trapezoidal, and the teeth are made of wear-resistant stainless steel plates.

4. A wood powder recycling and granulation system according to claim 3, characterized in that: A guide plate (62) and a plurality of guide cones (61) are arranged in the preheating and cooking tank (6). Safety valves (63) are arranged at the tops of both the preheating and cooking tank (6) and the pair-roll grinder (4).

5. A wood powder recycling and granulation system according to claim 4, characterized in that: The left half of the inner cylinder (14) is a closed cylinder body. Openings are provided on the barrel wall of the right half and the bottom plate (17) of the inner cylinder (14). A circumferential cutting knife (15) is arranged outside the barrel wall of the right half. A bottom cutting knife (16) is arranged on the right side of the bottom plate (17) of the inner cylinder (14). Both the circumferential cutting knife (15) and the bottom cutting knife (16) are fixedly installed on the horizontal shaft (18) through a tool rest (111).

6. The wood powder recycling and granulation system according to claim 5, characterized in that: It also includes a base (10), a sawdust collection box and a cylindrical sawdust compression box which are arranged side by side on the base (10); the sawdust collection box is connected to the rear end of the air guiding channel.

7. A wood powder recycling and granulation system according to claim 6, characterized in that: The inlet at the upper part of the sawdust compression box is connected to the outlet at the bottom of the sawdust collection box; a driving motor (110) is installed above the sawdust compression box, and a rotating shaft fixed on the driving shaft of the driving motor (110) extends into the sawdust compression box; a sector pressing plate is horizontally fixed at the bottom end of the rotating shaft; a hydraulic cylinder is installed on one side of the sawdust compression box on the base (10), and the piston rod of the hydraulic cylinder is fixedly connected to the mounting bracket of the driving motor (110).

8. A wood powder recycling and granulation system according to claim 7, characterized in that: A "convex" type connecting pipe which rotates counterclockwise by [degree] is also connected between the air guiding channel and the sawdust compression box. The upper port of the connecting pipe is an air outlet, and its lower port is connected to the sawdust collection box.

9. The wood powder recycling and granulation system according to claim 8, wherein: The sawdust compression box extends into the interior of the base (10), and a horizontal channel communicating with the inner bottom of the sawdust compression box is opened in the base (10); two push-pull plates are arranged at both ends of the sawdust compression box in the channel, and a push plate is fixedly extended upward from the front side surface in the rotating direction of the pressing plate.

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