Wood scrap grinding device and grinding method

Abstract

A wood scrap grinding device and grinding method, comprising a coarse grinding cylinder and a fine grinding cylinder. Along the direction from the coarse grinding cylinder to the fine grinding cylinder, the grinding gaps of the fine grinding mechanisms in the multiple fine grinding cylinders are gradually reduced, so that debris of different particle sizes are distributed in the multiple fine grinding cylinders and crushed by the fine grinding mechanisms with corresponding grinding precisions. Multiple fine grinding cylinders with different grinding precisions are arranged on the output side of the coarse grinding cylinder, and a screen with a set precision is arranged between every two adjacent fine grinding cylinders. The grinding precision of the fine grinding cylinders increases step by step, and the screening precision of the screen increases step by step, so that the wood after the initial screening can be quickly diffused into the fine grinding cylinder of the corresponding precision, and after being ground to the set precision in each fine grinding cylinder, it will automatically enter the fine grinding cylinder of the next precision. Grinding wood of different particle sizes with independent grinding chambers of multiple precisions can accelerate the grinding process of the wood and improve the overall efficiency of the fine grinding cylinder in grinding wood.

Description

Technical Field

[0001] The invention belongs to the technical field of wood grinding, and in particular relates to a wood scrap grinding device and a grinding method. Background Art

[0002] Wood scraps are the product of wood processing. In the production process of furniture and wooden products, such as cutting, drying, boarding, mechanical processing, etc., a large amount of wood chips, sawdust and other scraps will be generated. If these scraps are used and innovated reasonably, they can be transformed into a variety of valuable products, which not only reduces resource waste, but also creates economic benefits for enterprises.

[0003] The recycling of wood scraps requires grinding, that is, grinding and crushing them before secondary processing. The grinding and crushing of wood scraps is generally carried out in a wood crusher, which mainly relies on multiple side-by-side grinding knives to crush the wood, and the efficiency of wood crushing depends on the design of the grinding knives.

[0004] At present, wood scraps are usually ground into chips in only one grinding chamber. Due to the hardness, moisture content and position of the wood materials entering the grinder, the speed at which the same batch of materials enters the grinder varies. When multiple materials are ground in the same grinding chamber, some materials cannot be discharged in time and are over-ground, resulting in a decrease in the overall efficiency of the machine. Therefore, an efficient grinding device is urgently needed. Summary of the invention

[0005] In view of the above situation, in order to overcome the defects of the prior art, the present invention creatively adopts a wood scrap grinding device and a grinding method to partially solve the problems raised in the above background technology.

[0006] The technical solution adopted is as follows: The embodiment of the present invention proposes a wood scrap grinding device, comprising:

[0007] A coarse grinding cylinder, wherein a coarse grinding mechanism is provided inside the coarse grinding cylinder;

[0008] A plurality of fine grinding cylinders, each of which is provided with a fine grinding mechanism;

[0009] A driver is provided for driving the rough grinding mechanism and the fine grinding mechanism.

[0010] Among them, multiple fine grinding cylinders and coarse grinding cylinders are coaxially arranged, and the input and output ends are connected in sequence. A screen is provided between any two adjacent fine grinding cylinders. Along the direction from the coarse grinding cylinder to the fine grinding cylinder, the grinding gap of the fine grinding mechanism in the multiple fine grinding cylinders is gradually reduced, and the aperture of the screen is gradually reduced, so that debris of different particle sizes are distributed in the multiple fine grinding cylinders and crushed by the corresponding fine grinding mechanism.

[0011] Further, the fine grinding cylinder is provided with a first side wall and a second side wall in the axial direction, a fine grinding feed port is provided on the first side wall, and a fine grinding discharge port is provided on the second side wall, and fixed grinding discs equidistantly distributed are fixedly provided inside the fine grinding cylinder in the axial direction, and a fine grinding cavity is provided between any two adjacent fixed grinding discs and between the fixed grinding disc and the first side wall and the second side wall, and a movable grinding disc is rotatably installed inside the fine grinding cavity, and the movable grinding disc is coaxially arranged with the fixed grinding disc and can be driven to rotate by the driver;

[0012] The movable grinding disc, the fixed grinding disc and / or the first side wall are all provided with a grinding tooth group for grinding the wood chips entering the fine grinding chamber;

[0013] Along the direction from the rough grinding cylinder to the fine grinding cylinder, the gap between the movable grinding disc and the fixed grinding disc decreases gradually.

[0014] Furthermore, except for the movable grinding disc near the fine grinding discharge port, the remaining movable grinding discs and fixed grinding discs in the fine grinding cylinder are all provided with dividing windows, and the multiple dividing windows are coaxially distributed along the rotation axis of the movable grinding disc, and the size decreases gradually along the direction from the fine grinding feed port to the fine grinding discharge port.

[0015] Furthermore, an air duct is provided on the peripheral outer wall of the fine grinding cylinder, and the input end of the rough grinding cylinder and the air duct are both connected to an external hot air device, and hot air is introduced into the fine grinding chamber from the axial direction and the circumferential direction of the fine grinding cylinder, and the ground wood chips flow in the fine grinding chamber along the direction from the fine grinding feed port to the fine grinding discharge port;

[0016] The second side wall is provided with a guide tooth plate, and the guide tooth plate can guide the airflow in the fine grinding chamber from the circumferential direction to the fine grinding discharge port in an orderly manner. The screen is installed at the port of the fine grinding discharge port, and the ground wood chips can be discharged at the fine grinding discharge port through the screen.

[0017] Further, the grinding tooth group includes a plurality of first grinding tooth groups centrally symmetrically distributed around a rotation center and a plurality of second grinding tooth groups centrally symmetrically distributed around a rotation center, a plurality of the first grinding tooth groups distributed along a circumferential direction are set as a first grinding tooth region, and a plurality of the second grinding tooth groups distributed along a circumferential direction are set as a second grinding tooth region;

[0018] Among them, the strength of the first grinding tooth group is greater than the strength of the second grinding tooth group, and along the direction from the rough grinding cylinder to the fine grinding cylinder, the proportion of the first grinding tooth area decreases successively, and the proportion of the second grinding tooth area increases successively, and the proportion of the first grinding tooth area is set to 0%-60%, and the proportion of the second grinding tooth area is set to 40%-100%.

[0019] Furthermore, the first grinding tooth group includes three first grinding teeth distributed from inside to outside in the radial direction, and the three first grinding teeth are overlapped end to end in the radial direction and staggered in double rows in the circumferential direction;

[0020] The second grinding tooth group includes five second grinding teeth distributed from inside to outside in the radial direction, and the five second grinding teeth are arranged to overlap end to end in the radial direction and are staggered in double rows in the circumferential direction;

[0021] The width of the first grinding teeth is greater than that of the second grinding teeth, the first grinding teeth are configured as rectangular bars, and the second grinding teeth are configured as one or more of rectangular bars, arc bars, Y-shaped bars or triangular bars.

[0022] Furthermore, the coarse grinding cylinder is provided with a coarse grinding feed port and a coarse grinding discharge port along the axial direction, a grinding disc seat is fixedly provided inside the coarse grinding cylinder, a coarse grinding disc driven by the driver is provided on the inner side of the grinding disc seat, a coarse grinding cavity is provided between the grinding disc seat and the coarse grinding disc, and both ends of the coarse grinding cavity are respectively connected with the coarse grinding feed port and the coarse grinding discharge port.

[0023] Furthermore, a drive shaft is fixedly provided at the output end of the driver, and the drive shaft includes a first shaft section fixedly connected to the coarse grinding disc and a second shaft section fixedly connected to the movable grinding disc, and a reducer is installed between the second shaft section and the first shaft section so that the rotation speed of the second shaft section is higher than the rotation speed of the first shaft section.

[0024] Furthermore, the guide blades include first guide blades, second guide blades and third guide blades distributed from outside to inside in the radial direction, and the first guide blades, the second guide blades and the third guide blades are equal in number and are all centrally symmetrically distributed around the axis of the fine grinding discharge port;

[0025] Among them, the first guide tooth blade and the third guide tooth blade are located on the same arc line, and the second guide tooth blade is located between two adjacent first guide tooth blades in the circumferential direction. The arc line where the second guide tooth blade is located and the arc lines where the first guide tooth blade and the third guide tooth blade are located are centrally symmetrically distributed around the axis of the fine grinding discharge port.

[0026] The embodiment of the present invention provides a method for grinding wood scraps, using the above-mentioned wood scrap grinding device, comprising the following steps:

[0027] Step 1, coarse grinding: the wood scraps are introduced into the coarse grinding cylinder from the coarse grinding feed port together with the hot air flow, and are ground by the coarse grinding mechanism and heated and dried by the hot air flow;

[0028] Step 2, fine grinding: the material ground by the coarse grinding mechanism in the coarse grinding cylinder is discharged from the coarse grinding discharge port, and enters the fine grinding cylinder through the fine grinding feed port along with the hot air flow, and is discharged after being ground by the fine grinding mechanism;

[0029] In step 2, under the action of hot air flow, the coarsely ground material will pass through the dividing windows with gradually decreasing sizes in turn, and be distributed into the multiple fine grinding chambers, and be ground by the rotating movable grinding disc. During grinding, materials with relatively small particle sizes will pass through the screen and enter the lower or lower fine grinding cylinder, so that only materials with corresponding precision levels remain in the corresponding fine grinding cylinder, thereby improving the overall crushing efficiency of the fine grinding cylinder.

[0030] The beneficial effects achieved by the present invention using the above structure are as follows:

[0031] The present invention arranges a plurality of fine grinding cylinders with different grinding accuracies on the output side of the coarse grinding cylinder, and a screen with a set accuracy is arranged between every two adjacent fine grinding cylinders. The grinding accuracy of the fine grinding cylinder increases step by step, and the screening accuracy of the screen increases step by step, so that the wood after the initial screening can be quickly diffused into the fine grinding cylinder of the corresponding accuracy, and after each fine grinding cylinder is ground to the set accuracy, it will automatically enter the fine grinding cylinder of the next accuracy. By grinding wood of different particle sizes with independent grinding chambers of multiple precisions, the grinding process of the wood can be accelerated, and the overall efficiency of the fine grinding cylinder in grinding the wood can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A three-dimensional schematic diagram of a wood scrap grinding device proposed in an embodiment of the present invention;

[0033] Figure 2 A schematic diagram of a half-section structure of a wood scrap grinding device proposed in an embodiment of the present invention;

[0034] Figure 3 A schematic diagram of the internal structure of a rough grinding cylinder and a fine grinding cylinder according to an embodiment of the present invention;

[0035] Figure 4 for Figure 2 Schematic diagram of the internal structure;

[0036] Figure 5 A schematic diagram of the distribution structure of the guide blades provided in an embodiment of the present invention;

[0037] Figure 6A schematic structural diagram of a first movable grinding disc is provided for an embodiment of the present invention;

[0038] Figure 7 A schematic structural diagram of a second movable grinding disc is provided for an embodiment of the present invention;

[0039] Figure 8 A schematic structural diagram of a third movable grinding disc is provided for an embodiment of the present invention;

[0040] Fig. 9 A schematic diagram of the three-dimensional structure of a first movable grinding disc is provided for an embodiment of the present invention;

[0041] Fig.10 A schematic diagram of the three-dimensional structure of a second movable grinding disc is provided for an embodiment of the present invention;

[0042] Fig.11 A schematic diagram of the three-dimensional structure of a third movable grinding disc is provided for an embodiment of the present invention;

[0043] Fig.12 The present invention provides an internal schematic diagram of a reducer.

[0044] Among them, 10, coarse grinding cylinder, 100, coarse grinding feed port, 101, coarse grinding chamber, 102, coarse grinding discharge port; 11, grinding disc seat; 12, coarse grinding disc; 20, fine grinding cylinder, 2001, first fine grinding cylinder, 2002, second fine grinding cylinder, 2003, third fine grinding cylinder, 201, fine grinding feed port, 202, fine grinding chamber, 2021, first fine grinding chamber, 2022, second fine grinding chamber, 2023, third fine grinding chamber, 203, fine grinding discharge port, 204, material dividing window; 21, movable grinding disc, 2101, first movable grinding disc, 2102, second movable grinding disc, 2103, third movable grinding disc , 211, the first grinding tooth group, 212, the second grinding tooth group; 22, the fixed grinding disc; 23, the guide tooth plate, 231, the first guide tooth plate, 232, the second guide tooth plate, 233, the third guide tooth plate; 24, the screen; 30, the air guide pipe; 40, the driver; 401, the reducer; 41, the second shaft section, 4101, the first drive shaft, 4102, the second drive shaft, 4103, the third drive shaft, 410, the first shaft section; 42, the reducer, 421, the central gear, 422, the planetary gear, 423, the planetary carrier, 424, the ring gear, 425, the housing; 50, the discharge pipe.

[0045] The accompanying drawings are used to provide further understanding of the embodiments and constitute a part of the specification. They are used for explanation together with the embodiments and do not constitute a limitation of the embodiments. DETAILED DESCRIPTION

[0046] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection.

[0047] In the description of the embodiments, it should be understood that terms such as "up", "down", "front", "back", "left", "right", "top", "bottom", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the embodiments.

[0048] like Figure 1 As shown, an embodiment of the present invention provides a wood scrap grinding device, comprising a coarse grinding cylinder 10 , a fine grinding cylinder 20 and a driver 40 .

[0049] A coarse grinding mechanism is provided inside the coarse grinding cylinder 10, a plurality of fine grinding cylinders 20 are provided at the rear side of the coarse grinding cylinder 10, a fine grinding mechanism is provided inside the fine grinding cylinder 20, and a driver 40 is provided at the rear side of the coarse grinding cylinder 10 and the fine grinding cylinder 20, and is used to drive the coarse grinding mechanism and the fine grinding mechanism.

[0050] Further, such as Figure 2 and Figure 3 As shown, the coarse grinding cylinder 10 is provided with a coarse grinding feed port 100 and a coarse grinding discharge port 102 along the axial direction, a grinding disc seat 11 is fixedly provided inside the coarse grinding cylinder 10, a coarse grinding disc 12 which can be driven by a driver 40 is provided on the inner side of the grinding disc seat 11, a coarse grinding cavity 101 is defined between the grinding disc seat 11 and the coarse grinding disc 12, and two ends of the coarse grinding cavity 101 are respectively connected with the coarse grinding feed port 100 and the coarse grinding discharge port 102.

[0051] In some embodiments, the grinding wheel seat 11 is configured as an inverted cone structure, and the coarse grinding wheel 12 is configured as a cone structure that cooperates with the grinding wheel seat 11. When in use, the scraps are introduced into the coarse grinding cylinder 10 from the coarse grinding feed port 100 together with the hot air. In the coarse grinding chamber 101, the wood scraps are initially ground into coarse particles through the grinding of the grinding wheel seat 11 and the coarse grinding wheel 12. During the grinding process, the hot air will heat the coarse particles to further remove moisture from the wood, making it easier for the wood to form powder.

[0052] like Figure 1 , Figure 2 and Figure 4As shown, a plurality of fine grinding cylinders 20 and a coarse grinding cylinder 10 are coaxially arranged, and the input and output ends of the fine grinding cylinders 20 and the coarse grinding cylinders 10 are connected in sequence, and a screen 24 is provided between any two adjacent fine grinding cylinders 20. Along the direction from the coarse grinding cylinder 10 to the fine grinding cylinder 20, the grinding gaps of the fine grinding mechanisms in the plurality of fine grinding cylinders 20 are gradually reduced, and the apertures of the screen 24 are gradually reduced, so that debris of different particle sizes are distributed in the plurality of fine grinding cylinders 20 and crushed by the fine grinding mechanisms of corresponding grinding precision.

[0053] A plurality of fine grinding cylinders 20 with different grinding accuracies are arranged on the output side of the coarse grinding cylinder 10, and a screen 24 with a set accuracy is arranged between every two adjacent fine grinding cylinders 20. The grinding accuracy of the fine grinding cylinder 20 increases step by step, and the screening accuracy of the screen 24 increases step by step. In this way, the wood after the initial screening can be quickly diffused into the fine grinding cylinder 20 of the corresponding accuracy, and after each fine grinding cylinder 20 is ground to a suitable accuracy, it will automatically enter the fine grinding cylinder 20 of the next accuracy. Grinding wood of different particle sizes with independent grinding chambers of multiple accuracy can accelerate the grinding process of the wood and improve the overall efficiency of the fine grinding cylinder 20 in grinding wood.

[0054] In some embodiments, the fine grinding cylinder 20 includes a first fine grinding cylinder 2001, a second fine grinding cylinder 2002 and a third fine grinding cylinder 2003, wherein the first fine grinding cylinder 2001, the second fine grinding cylinder 2002 and the third fine grinding cylinder 2003 are distributed in sequence along the material conveying direction, and the grinding accuracy of the first fine grinding cylinder 2001, the second fine grinding cylinder 2002 and the third fine grinding cylinder 2003 is gradually improved, and a discharge pipe 50 is provided at the tail end of the third fine grinding cylinder 2003, and the discharge pipe 50 is connected to an external negative pressure device, which can suck and discharge the wood chips ground to a set particle size.

[0055] Furthermore, the fine grinding cylinder 20 is provided with a first side wall and a second side wall along the axial direction, the first side wall is provided with a fine grinding feed port 201, and the second side wall is provided with a fine grinding discharge port 203. After the coarsely ground material in the coarse grinding cylinder 10 is discharged from the coarse grinding discharge port 102, it enters the fine grinding cylinder 20 through the fine grinding feed port 201.

[0056] like Figure 3 and Figure 4 As shown, the interior of the fine grinding cylinder 20 is fixedly provided with equidistantly distributed fixed grinding discs 22 along the axial direction, and a fine grinding cavity 202 is provided between any two adjacent fixed grinding discs 22 and between the fixed grinding disc 22 and the first side wall and the second side wall. A movable grinding disc 21 is rotatably installed inside the fine grinding cavity 202. The movable grinding disc 21 is coaxially arranged with the fixed grinding disc 22 and can be driven to rotate by the driver 40. In this way, the material entering the fine grinding cylinder 20 will be filled in the fine grinding cavity 202 and ground into powder between the movable grinding disc 21 and the fixed grinding disc 22.

[0057] Furthermore, along the direction from the coarse grinding cylinder 10 to the fine grinding cylinder 20, the gap between the movable grinding disc 21 and the fixed grinding disc 22 is gradually reduced, that is, the gap between the movable grinding disc 21 and the fixed grinding disc 22 arranged in the first fine grinding cylinder 2001, the second fine grinding cylinder 2002 and the third fine grinding cylinder 2003 is gradually reduced, so that the grinding accuracy of the first fine grinding cylinder 2001, the second fine grinding cylinder 2002 and the third fine grinding cylinder 2003 is gradually improved.

[0058] Furthermore, the movable grinding disc 21 , the fixed grinding disc 22 and / or the first side wall are all provided with a grinding tooth set for grinding the wood chips entering the fine grinding chamber 202 .

[0059] like Figure 6 , Figure 7 , Figure 8 , Fig. 9 , Fig.10 and Fig.11 As shown, the grinding tooth group includes multiple groups of first grinding tooth groups 211 distributed centrally and symmetrically around the rotation center and multiple groups of second grinding tooth groups 212 distributed centrally and symmetrically around the rotation center. The multiple first grinding tooth groups 211 distributed along the circumferential direction are set as the first grinding tooth area, and the multiple second grinding tooth groups 212 distributed along the circumferential direction are set as the second grinding tooth area.

[0060] Among them, the strength of the first grinding tooth group 211 is greater than the strength of the second grinding tooth group 212. Since a stronger shear force is required when grinding wood with relatively large particle size, grinding teeth with higher strength are required. Along the direction from the coarse grinding cylinder 10 to the fine grinding cylinder 20, the proportion of the first grinding tooth area decreases successively, and the proportion of the second grinding tooth area increases successively.

[0061] In some embodiments, the proportion of the first grinding tooth area is set to 0%-60%, and the proportion of the second grinding tooth area is set to 40%-100%. Take the first movable grinding disc 2101, the second movable grinding disc 2102 and the third movable grinding disc 2103 as examples, wherein the proportion of the first grinding tooth area on the first movable grinding disc 2101 is 60%, and the proportion of the second grinding tooth area is set to 40%, the proportion of the first grinding tooth area on the second movable grinding disc 2102 is 30%, and the proportion of the second grinding tooth area is set to 70%, and the proportion of the first grinding tooth area on the third movable grinding disc 2103 is 0%, and the proportion of the second grinding tooth area is set to 100%. Such a setting enables the first movable grinding disc 2101 to have a strong shear resistance, which is suitable for shearing large-sized wood particles, and the grinding teeth on the corresponding third movable grinding disc 2103 are densely distributed, making it easier to grind fine wood chips.

[0062] Furthermore, the first grinding tooth group 211 includes three first grinding teeth distributed from the inside to the outside in the radial direction, and the three first grinding teeth are overlapped end to end in the radial direction and are staggered in double rows in the circumferential direction. The second grinding tooth group 212 includes five second grinding teeth distributed from the inside to the outside in the radial direction, and the five second grinding teeth are overlapped end to end in the radial direction and are staggered in double rows in the circumferential direction, wherein the width of the first grinding tooth is greater than the width of the second grinding tooth, the first grinding tooth is set as a rectangular bar, and the second grinding tooth is set as one or more of a rectangular bar, an arc bar, a Y-shaped bar or a triangular bar.

[0063] In this way, the first grinding teeth are longer and wider than the second grinding teeth as a whole, and have relatively higher strength, which is suitable for crushing wood with large particle size. The space between the first grinding teeth of the same group is relatively small, while the space between the first grinding teeth of adjacent groups is relatively large, so that the wood chips are easily placed between the two groups of first grinding teeth, and when the grinding disc rotates, the wood chips between the grinding teeth are easily crushed. The shape of the second grinding teeth is relatively narrow, and the gaps between the second grinding teeth are relatively large, so that the wood chips and powder are easily placed between the second grinding teeth. When the second grinding teeth rotate at high speed, the wood chips are easily ground into powder.

[0064] like Figure 3 As shown, in some embodiments, the number of fixed grinding discs 22 is set to two, and the number of fine grinding chambers 202 is three. Along the direction from the fine grinding feed inlet 201 to the fine grinding discharge port 203, there are the first fine grinding chamber 2021, the second fine grinding chamber 2022, and the third fine grinding chamber 2023; the number of corresponding movable grinding discs 21 is set to three, except for the movable grinding disc 21 close to the fine grinding discharge port 203, the remaining movable grinding discs 21 and the fixed grinding discs 22 in the fine grinding cylinder 20 are all provided with dividing windows 204, and the multiple dividing windows 204 are coaxially distributed along the rotation axis of the movable grinding disc 21, and the size is gradually reduced along the direction from the fine grinding feed inlet 201 to the fine grinding discharge port 203.

[0065] In this way, due to the presence of the conically distributed dividing window 204, the material entering from the fine grinding feed port 201 will enter the first fine grinding chamber 2021, the second fine grinding chamber 2022, and the third fine grinding chamber 2023 in turn, and will be ground between the three groups of movable grinding discs 21 and the fixed grinding disc 22 respectively, which can increase the grinding area of ​​the wood and thus improve the grinding efficiency; under the action of the hot air flow, the material will flow to the rear side with the air flow, and during the grinding process, the material smaller than the aperture of the screen 24 will be discharged from the fine grinding discharge port 203 to the next fine grinding cylinder 20 for grinding of the next precision level; if the discharge requirements are not met, it will continue to be ground in the third fine grinding chamber 2023 until the particle size meets the requirements and is discharged from the fine grinding discharge port 203 through the screen 24.

[0066] Furthermore, an air duct 30 is provided on the peripheral outer wall of the fine grinding cylinder 20, and the number of the air duct 30 corresponds to the number of the fine grinding chambers 202. The input end of the rough grinding cylinder 10 and the air duct 30 are both connected to an external hot air device. The hot air entering from the air duct 30 can be introduced into the fine grinding chamber 202 from the circumferential direction of the fine grinding cylinder 20, and the hot air entering from the fine grinding feed port 201 can be introduced into the fine grinding chamber 202 from the axial direction, and the ground wood chips flow in the fine grinding chamber 202 along the direction from the fine grinding feed port 201 to the fine grinding discharge port 203.

[0067] Furthermore, the second side wall is provided with a guide tooth piece 23, which can guide the airflow in the fine grinding chamber 202 in an orderly manner from the circumferential direction to the direction of the fine grinding discharge port 203, and the screen 24 is installed at the port of the fine grinding discharge port 203, and the ground wood chips can be discharged from the fine grinding discharge port 203 through the screen 24. In this way, the wood chips ground in the fine grinding chamber 202 will gather on the second side wall surface under the action of the hot air, and under the action of the guide tooth piece 23 on the second side wall surface, the wood chips are gathered in the direction of the screen 24, so that the wood chips that meet the precision grade are discharged from the fine grinding discharge port 203 through the screen 24, and the remaining wood chips that do not meet the precision grade are ground by the guide tooth piece 23 and the movable grinding disc 21, and after reaching the precision grade, they are discharged from the fine grinding discharge port 203 through the screen 24.

[0068] like Figure 5 As shown, in some embodiments, the guide tooth blade 23 includes a first guide tooth blade 231, a second guide tooth blade 232 and a third guide tooth blade 233 distributed from the outside to the inside along the radial direction, and the number of the first guide tooth blade 231, the second guide tooth blade 232 and the third guide tooth blade 233 is equal, and they are all centrally symmetrically distributed around the axis of the fine grinding discharge port 203.

[0069] Among them, the first guide tooth blade 231 and the third guide tooth blade 233 are located on the same arc line, and the second guide tooth blade 232 is located between two adjacent first guide tooth blades 231 along the circumferential direction. The arc line where the second guide tooth blade 232 is located and the arc lines where the first guide tooth blade 231 and the third guide tooth blade 233 are located are centrally symmetrically distributed around the axis of the fine grinding discharge port 203.

[0070] During operation, due to the action of hot air, the wood chips will first gather at the edge of the second side wall, and the first guide tooth plate 231 distributed on the outermost side will gather the wood chips accumulated at the edge to the second guide tooth plate 232. Since the hot air flows in the air duct between the first guide tooth plate 231, the second guide tooth plate 232 and the third guide tooth plate 233, the wood chips will continue to be guided from the second guide tooth plate 232 to the third guide tooth plate 233, so that the wood chips will finally pass through the screen 24 and be discharged from the fine grinding discharge port 203.

[0071] like Figure 4As shown, the output end of the driver 40 is fixedly provided with a drive shaft through a reducer 401, and the drive shaft includes a first shaft section 410 fixedly connected to the coarse grinding disc 12 and a second shaft section 41 fixedly connected to the movable grinding disc 21, and a reducer 42 is installed between the second shaft section 41 and the first shaft section 410, so that the rotation speed of the second shaft section 41 is higher than the rotation speed of the first shaft section 410.

[0072] In some embodiments, the second shaft section 41 is respectively provided as the first drive shaft 4101, the second drive shaft 4102 and the third drive shaft 4103 in the first fine grinding cylinder 2001, the second fine grinding cylinder 2002 and the third fine grinding cylinder 2003, and a reducer 42 is provided between the first drive shaft 4101 and the second drive shaft 4102 and between the second drive shaft 4102 and the third drive shaft 4103. Fig.12 As shown, the reducer 42 is made of a reduction gear set, and the reducer 42 includes a central gear 421 connected to the power input shaft and a planetary carrier 423 connected to the power output shaft. The planetary carrier 423 is rotatably connected to three planetary gears 422 distributed on the outside of the central gear 421 and meshing with the central gear 421 for transmission. A gear ring 424 is also provided on the outside of the planetary gear 422, and a housing 425 is fixedly provided on the outside of the gear ring 424 to form a planetary reduction gear set; wherein the power input shaft passes through the central gear 421 and the planetary gear 422 is meshed with the central gear 421. After the transmission of the wheel 421, the planetary gear 422, the gear ring 424 and the planetary carrier 423, the power output shaft is decelerated and output, the housing 425 is fixed in the channel of the fine grinding discharge port 203 through a cross-shaped or Y-shaped bracket, and the wood chips are discharged step by step into the next fine grinding cylinder 20 through the channel between the housing of the reducer 42 and the inner wall of the fine grinding discharge port 203. Multiple reducers 42 are arranged between the first drive shaft 4101, the second drive shaft 4102 and the third drive shaft 4103 to achieve a step-by-step deceleration effect. In this way, under the step-by-step deceleration of the reducer 42, the rotation speed of the third drive shaft 4103 is the highest, and the rotation speeds of the second drive shaft 4102, the first drive shaft 4101 and the first shaft section 410 are gradually reduced. The highest rotation speed is suitable for grinding finer wood chips, while the coarse grinding cylinder 10 with a low rotation speed and relatively large torque is suitable for preliminary grinding of larger particles of scraps.

[0073] The embodiment of the present invention provides a method for grinding wood scraps, using the above-mentioned wood scrap grinding device, comprising the following steps:

[0074] Step 1, coarse grinding: The wood scraps are introduced into the coarse grinding cylinder 10 from the coarse grinding feed port 100 along with the hot air flow. While being ground by the coarse grinding mechanism, they are also heated and dried by the hot air flow. When in use, the scraps are introduced into the coarse grinding cylinder 10 from the coarse grinding feed port 100 along with the hot air. In the coarse grinding chamber 101, the wood scraps are initially ground into coarse particles through the grinding of the grinding disc seat 11 and the coarse grinding disc 12. During the grinding process, the hot air will heat the coarse particles to further remove moisture from the wood, making it easier for the wood to form powder.

[0075] Step 2, fine grinding: the material ground by the rough grinding mechanism in the rough grinding cylinder 10 is discharged from the rough grinding discharge port 102, and enters the fine grinding cylinder 20 through the fine grinding feed port 201 along with the hot air flow, and is discharged after being ground by the fine grinding mechanism. Among them, the material entering from the fine grinding feed port 201 will enter the first fine grinding chamber 2021, the second fine grinding chamber 2022, and the third fine grinding chamber 2023 in sequence, and be ground between the three groups of movable grinding discs 21 and the fixed grinding disc 22 respectively, which can increase the grinding area of ​​the wood, thereby improving the grinding efficiency; under the action of the hot air flow, the material will flow to the rear side with the air flow, and the material smaller than the aperture of the screen 24 during the grinding process will be discharged from the fine grinding discharge port 203 to the next fine grinding cylinder 20 for grinding of the next precision level. If the discharge requirement is not met, it will continue to be ground in the third fine grinding chamber 2023 until the particle size meets the requirement and is discharged from the fine grinding discharge port 203 through the screen 24.

[0076] In step 2, under the action of hot air flow, the coarsely ground materials will pass through the dividing windows 204 with gradually decreasing sizes in turn, and be distributed into multiple fine grinding chambers 202, and ground by the rotating movable grinding disc 21. During grinding, materials with relatively small particle sizes will pass through the screen 24 and enter the lower or lower fine grinding cylinder 20, so that only materials of corresponding precision levels will remain in the corresponding fine grinding cylinder 20, thereby improving the overall crushing efficiency of the fine grinding cylinder 20.

[0077] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0078] Although embodiments have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations may be made to the embodiments without departing from the principles and spirit thereof, and the scope of the embodiments is defined by the appended claims and their equivalents.

[0079] The above description of the implementation mode is not restrictive, and the drawings show only one of the implementation modes, and the actual structure is not limited thereto. In short, if ordinary technicians in the field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the invention, they should all fall within the scope of protection.

Claims

1. A wood scrap grinding device, characterized in that: include: A coarse grinding cylinder (10), wherein a coarse grinding mechanism is provided inside the coarse grinding cylinder (10); A plurality of fine grinding cylinders (20), wherein a fine grinding mechanism is provided inside the fine grinding cylinders (20); A driver (40) configured to drive the rough grinding mechanism and the fine grinding mechanism; The plurality of fine grinding cylinders (20) and the rough grinding cylinder (10) are coaxially arranged, and the input and output ends are connected in sequence; a screen (24) is provided between any two adjacent fine grinding cylinders (20); along the direction from the rough grinding cylinder (10) to the fine grinding cylinder (20), the grinding gaps of the fine grinding mechanisms in the plurality of fine grinding cylinders (20) are gradually reduced, and the apertures of the screen (24) are gradually reduced, so that debris of different particle sizes are distributed in the plurality of fine grinding cylinders (20) and crushed by the corresponding fine grinding mechanisms; The fine grinding cylinder (20) is provided with a first side wall and a second side wall in the axial direction, the first side wall is provided with a fine grinding feed port (201), and the second side wall is provided with a fine grinding discharge port (203), the interior of the fine grinding cylinder (20) is fixedly provided with fixed grinding discs (22) distributed equidistantly in the axial direction, a fine grinding cavity (202) is provided between any two adjacent fixed grinding discs (22) and between the fixed grinding disc (22) and the first side wall and the second side wall, a movable grinding disc (21) is rotatably installed in the interior of the fine grinding cavity (202), the movable grinding disc (21) is coaxially arranged with the fixed grinding disc (22), and can be driven to rotate by the driver (40); The movable grinding disc (21), the fixed grinding disc (22) and / or the first side wall are all provided with a grinding tooth group for grinding the wood chips entering the fine grinding chamber (202); Along the direction from the rough grinding cylinder (10) to the fine grinding cylinder (20), the gap between the movable grinding disc (21) and the fixed grinding disc (22) gradually decreases; The grinding tooth group comprises a plurality of first grinding tooth groups (211) distributed centrally and symmetrically around a rotation center and a plurality of second grinding tooth groups (212) distributed centrally and symmetrically around a rotation center, a plurality of the first grinding tooth groups (211) distributed along a circumferential direction are arranged as a first grinding tooth region, and a plurality of the second grinding tooth groups (212) distributed along a circumferential direction are arranged as a second grinding tooth region; The strength of the first grinding tooth group (211) is greater than the strength of the second grinding tooth group (212); along the direction from the rough grinding cylinder (10) to the fine grinding cylinder (20), the proportion of the first grinding tooth area decreases gradually, and the proportion of the second grinding tooth area increases gradually; the proportion of the first grinding tooth area is set to 0%-60%, and the proportion of the second grinding tooth area is set to 40%-100%.

2. The wood scrap grinding device according to claim 1, characterized in that: Except for the movable grinding disc (21) near the fine grinding discharge port (203), the remaining movable grinding discs (21) and fixed grinding discs (22) in the fine grinding cylinder (20) are all provided with dividing windows (204), and the plurality of dividing windows (204) are coaxially distributed along the rotation axis of the movable grinding disc (21), and the sizes thereof gradually decrease along the direction from the fine grinding feed port (201) to the fine grinding discharge port (203).

3. The wood scrap grinding device according to claim 2, characterized in that: An air guide pipe (30) is provided on the peripheral outer wall of the fine grinding cylinder (20); the input end of the rough grinding cylinder (10) and the air guide pipe (30) are both connected to an external hot air device, and hot air is introduced into the fine grinding chamber (202) from the axial direction and the circumferential direction of the fine grinding cylinder (20), and the ground wood chips flow in the fine grinding chamber (202) along the direction from the fine grinding feed port (201) to the fine grinding discharge port (203); The second side wall is provided with a guide tooth plate (23), and the guide tooth plate (23) can guide the airflow in the fine grinding chamber (202) in an orderly manner from the circumferential direction to the direction of the fine grinding discharge port (203). The screen (24) is installed at the port of the fine grinding discharge port (203), so as to enable the ground wood chips to pass through the screen (24) and be discharged at the fine grinding discharge port (203).

4. The wood scrap grinding device according to claim 1, characterized in that: The first grinding tooth group (211) comprises three first grinding teeth distributed from inside to outside in the radial direction, the three first grinding teeth being arranged end to end overlapping in the radial direction and being distributed in double rows in a staggered manner in the circumferential direction; The second grinding tooth group (212) comprises five second grinding teeth distributed from inside to outside in the radial direction, the five second grinding teeth being arranged end to end overlapping in the radial direction and being distributed in double rows in a staggered manner in the circumferential direction; The width of the first grinding teeth is greater than that of the second grinding teeth, the first grinding teeth are configured as rectangular bars, and the second grinding teeth are configured as one or more of rectangular bars, arc bars, Y-shaped bars or triangular bars.

5. The wood scrap grinding device according to claim 3, characterized in that: The coarse grinding cylinder (10) is provided with a coarse grinding feed inlet (100) and a coarse grinding discharge outlet (102) along the axial direction; a grinding disc seat (11) is fixedly provided inside the coarse grinding cylinder (10); a coarse grinding disc (12) which can be driven by the driver (40) is provided on the inner side of the grinding disc seat (11); a coarse grinding cavity (101) is provided between the grinding disc seat (11) and the coarse grinding disc (12); and two ends of the coarse grinding cavity (101) are respectively connected to the coarse grinding feed inlet (100) and the coarse grinding discharge outlet (102).

6. The wood scrap grinding device according to claim 5, characterized in that: A drive shaft is fixedly provided at the output end of the driver (40), the drive shaft comprising a first shaft section (410) fixedly connected to the coarse grinding disc (12) and a second shaft section (41) fixedly connected to the movable grinding disc (21), a reducer (42) being installed between the second shaft section (41) and the first shaft section (410), so that the rotation speed of the second shaft section (41) is higher than the rotation speed of the first shaft section (410).

7. The wood scrap grinding device according to claim 6, characterized in that: The guide blades (23) comprise a first guide blade (231), a second guide blade (232) and a third guide blade (233) which are distributed from outside to inside in a radial direction, wherein the first guide blades (231), the second guide blades (232) and the third guide blades (233) are equal in number and are all centrally symmetrically distributed around the axis of the fine grinding discharge port (203); The first guide tooth blade (231) and the third guide tooth blade (233) are located on the same arc line, the second guide tooth blade (232) is located between two adjacent first guide tooth blades (231) in the circumferential direction, and the arc line where the second guide tooth blade (232) is located and the arc lines where the first guide tooth blade (231) and the third guide tooth blade (233) are located are centrally symmetrically distributed around the axis of the fine grinding discharge port (203).

8. A method for grinding wood scraps, characterized in that: The use of the wood scrap grinding device according to claim 7 comprises the following steps: Step 1, coarse grinding: the wood scraps are introduced into the coarse grinding cylinder (10) along with the hot air flow from the coarse grinding feed port (100), and are ground by the coarse grinding mechanism while being heated and dried by the hot air flow; Step 2, fine grinding: the material ground by the coarse grinding mechanism in the coarse grinding cylinder (10) is discharged from the coarse grinding discharge port (102), and enters the fine grinding cylinder (20) along with the hot air flow through the fine grinding feed port (201), and is ground by the fine grinding mechanism before being discharged; In step 2, under the action of the hot air flow, the coarsely ground material will pass through the material distribution windows (204) of gradually decreasing sizes in turn, and be distributed into the plurality of fine grinding chambers (202), and be ground by the rotating movable grinding disc (21). During grinding, the material with a relatively small particle size will pass through the screen (24) and enter the fine grinding cylinder (20) of the lower or lower level, so that only the material of the corresponding precision level will remain in the corresponding fine grinding cylinder (20), thereby improving the overall crushing efficiency of the fine grinding cylinder (20).

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