Crushing device and crushing method for recycling wood waste

Abstract

A crushing device and a crushing method for recycling wood waste, comprising a casing and a crushing grinding disc, wherein the crushing grinding disc is arranged in the casing and is used for crushing materials in the casing, the crushing grinding disc comprises a movable grinding disc and a fixed grinding disc arranged coaxially, the gap between the movable grinding disc and the fixed grinding disc is arranged as a crushing channel, and grinding teeth are fixedly arranged on the surfaces of the movable grinding disc and the fixed grinding disc facing the crushing channel, and the spacing between the two groups of grinding teeth gradually decreases along the radial direction, so that the materials in the crushing channel are crushed step by step from large to small along the radial direction, so that only one group of crushing grinding discs needs to be arranged to realize the unified crushing of wood materials of different sizes into wood chips of target sizes, and compared with the arrangement of a multi-stage crushing mechanism, it has the advantages of simple and compact structure, small number of mechanisms, and not easy to be damaged.

Description

Technical Field

[0001] The invention belongs to the technical field of wood crushing and processing, and specifically refers to a crushing device and a crushing method for recycling wood waste. Background Art

[0002] Wood waste includes offcuts, scraps, board edges, etc. During the wood processing process, some materials are cut off because their size does not meet the requirements or their shapes are irregular. The above waste can be made into biomass combustion pellets after crushing. As the raw material of biomass energy, it can also be used as the raw material of organic fertilizer, raw material of building boards, etc. It has multiple uses and potential value.

[0003] Since wood waste has different sizes, the current wood waste crushing device needs to be equipped with a multi-stage crushing mechanism, such as multiple sets of crushing rollers or grinding discs. Although the crushing effect required for use can be achieved in the end, the setting of the multi-stage crushing mechanism causes the overall volume and weight of the device to be large, making the device difficult to transport and assemble, and there are relatively many internal transmission mechanisms, which increases the probability of machine failure. Therefore, there is an urgent need for a crushing device with a simple and compact structure and a multi-stage crushing function. Summary of the invention

[0004] In view of the above situation, in order to overcome the defects of the prior art, the present invention creatively adopts a crushing device and a crushing method for recycling wood waste to at least partially solve the problems raised in the above background technology.

[0005] The technical solution adopted is as follows: The embodiment of the present invention proposes a crushing device for recycling wood waste, comprising:

[0006] The working chamber is used to place the material to be crushed;

[0007] A crushing grinding disc is arranged in the working chamber and is used to crush the material in the working chamber;

[0008] A driver, drivingly connected to the crushing millstone, for driving the crushing millstone;

[0009] The crushing grinding disc comprises a coaxially arranged movable grinding disc and a fixed grinding disc, the gap between the movable grinding disc and the fixed grinding disc is set as a crushing channel, the fixed grinding disc is fixed in the working chamber, the movable grinding disc is driven to rotate by the driver, and a discharge port is opened at the axial center position of the fixed grinding disc;

[0010] The surfaces of the movable grinding disc and the fixed grinding disc facing the crushing channel are both fixedly provided with grinding teeth, and the spacing between the two groups of grinding teeth gradually decreases from the outside to the inside along the radial direction, so that the materials in the crushing channel are crushed step by step from large to small along the radial direction;

[0011] The surface of the crushing grinding disc facing the crushing channel is set as the first surface, and the other side surface is set as the second surface. The first surface is provided with a first tooth area, a second tooth area and a third tooth area from the outside to the inside in the radial direction. The first tooth area is provided with a first grinding rack and a second grinding rack distributed in the circumferential direction. The second tooth area is provided with a third grinding rack and a fourth grinding rack distributed in the circumferential direction. The third tooth area is provided with a third grinding tooth.

[0012] The first grinding rack comprises a first grinding section and a reinforcement section distributed on the side of the first grinding section, wherein the reinforcement section is perpendicular to the first grinding section; the second grinding rack comprises a first transition section and a second grinding section continuously distributed from outside to inside in a radial direction, wherein an angle between an end face of the first transition section and an end face of the crushing grinding disc is 45° to 60°; the third grinding rack comprises a second transition section and a third grinding section continuously distributed from outside to inside in a radial direction, wherein an angle between an end face of the second transition section and an end face of the crushing grinding disc is 45° to 60°;

[0013] Among them, the grinding surface of the second grinding section and the grinding surface of the fourth grinding rack are located in the same plane, the grinding surface of the third grinding section and the grinding surface of the third grinding tooth are located in the same plane, the grinding surface height of the third grinding tooth is greater than the grinding surface height of the fourth grinding rack and the grinding surface height of the first grinding rack, the first grinding rack and the third grinding rack are distributed intermittently, and the second grinding rack, the fourth grinding rack and the third grinding tooth are distributed continuously.

[0014] Furthermore, it also includes a casing and a discharge pipe, the casing surface is provided with a feed port connected to the working chamber, the discharge pipe is fixedly arranged on the casing and connected to an external negative pressure device, the suction end of the discharge pipe is connected to the discharge port, and an air flow channel is provided between two adjacent grinding teeth.

[0015] Furthermore, the first surface is set as a stepped table or a conical surface, the second surface is set as a plane, the grinding teeth are set as bar teeth distributed in the radial direction, the surface of the grinding teeth facing the crushing channel is set as a plane or a toothed surface, the angle between the end surface of the grinding tooth away from the axis of the crushing grinding disc and the second surface is configured as an acute angle or a right angle, and the size of the grinding teeth along the radial direction is configured to be equal or gradually increase from the outside to the inside.

[0016] Furthermore, the widths of the crushing channels along the circumferential direction are the same or cyclically distributed from large to small.

[0017] Furthermore, two symmetrically distributed fixed grinding discs are provided in the middle position of the working chamber, a positioning frame is fixedly provided between the two fixed grinding discs and fixed to the inside of the casing through the positioning frame, and a sealing ring is fixedly installed on the circumference of the fixed grinding disc to form a closed air cavity between the two fixed grinding discs, and the discharge pipe extends into the air cavity and is connected to the discharge port.

[0018] Furthermore, it also includes an air guide pipe group, the air guide pipe group includes an air inlet pipe and an exhaust pipe fixedly arranged on the housing, the input end of the air inlet pipe is connected to the external hot air device, and the output end of the air inlet pipe is connected to the lower end of the air cavity and the lower end of the working cavity, and the input end of the exhaust pipe is connected to the upper end of the air cavity;

[0019] The fixed grinding disc is provided with air holes, the air holes are connected to the air cavity and then the crushing channel, and the air holes are located between the grinding teeth.

[0020] Furthermore, a movable grinding disc is provided on both sides of the fixed grinding disc, and the driver includes a motor, a driving wheel, a transmission belt and a driven wheel. The driven wheel is fixedly connected to the movable grinding disc through an axis passing through the casing, and the output shafts on both sides of the motor are fixedly connected to the driving wheel. The transmission belt is installed between the driving wheel and the driven wheel, so that the motor can drive the two groups of movable grinding discs to rotate.

[0021] Furthermore, a guide cone is provided at the middle position of the movable grinding disc, the guide cone is coaxially distributed with the discharge port, and the cone tip of the guide cone is located in the discharge port.

[0022] The embodiment of the present invention provides a method for crushing wood waste for recycling, using the above-mentioned crushing device for recycling wood waste, comprising the following steps:

[0023] Feeding: waste materials of different sizes are uniformly fed into the casing through the feed inlet;

[0024] Crushing: The waste will pass through the crushing channel from outside to inside one by one, and will be ground and crushed by the corresponding grinding teeth during the movement;

[0025] Discharging: Negative pressure is generated by an external negative pressure device, and the crushed waste chips are sucked and discharged from the discharge port through the discharge pipe;

[0026] In the crushing step, whether the air duct group is connected to an external hot air device is selected according to the humidity of the waste, and when the humidity of the waste exceeds a set value, gas of a set temperature is introduced into the air cavity through the air duct group to dry the waste during the crushing process.

[0027] The beneficial effects achieved by the present invention using the above structure are as follows:

[0028] By fixing grinding teeth on the surface of the grinding disc, and the spacing between the two sets of grinding teeth gradually decreases along the radial direction, the materials between the grinding discs are crushed step by step from large to small along the radial direction. In this way, only one set of crushing grinding discs is needed to uniformly crush wood of various sizes into wood chips of target size. Compared with the setting of multi-stage crushing mechanism, it has the advantages of simple and compact structure, small number of mechanisms, and not easy to be damaged. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic diagram of the three-dimensional structure of a wood waste recycling crushing device proposed in an embodiment of the present invention;

[0030] Figure 2 A schematic diagram of the internal structure of a wood waste recycling crushing device proposed in an embodiment of the present invention;

[0031] Figure 3 for Figure 2 Schematic diagram of the cross-sectional structure along the AA direction;

[0032] Figure 4 for Figure 2 Schematic diagram of the cross-sectional structure along the BB direction;

[0033] Figure 5 A schematic diagram of the three-dimensional structure of a movable grinding disc proposed in an embodiment of the present invention;

[0034] Figure 6 A schematic side view of the structure of a movable grinding disc proposed in an embodiment of the present invention;

[0035] Figure 7 This is a schematic diagram of the local distribution structure of the grinding teeth proposed in an embodiment of the present invention.

[0036] Among them, 10, housing; 11, bracket; 101, feed port; 102, working chamber; 20, crushing grinding disc; 200, crushing channel; 201, discharge port; 20A, first tooth area; 20B, second tooth area; 20C, third tooth area; 2a, movable grinding disc; 2a1, guide cone; 2b, fixed grinding disc; 2b0, air cavity; 2b01, air hole; 2b1, positioning frame; 2b2, sealing ring; 2c, grinding teeth; 2c0, air flow channel; 2cA, first grinding teeth; 2cA1, first grinding rack; 2cA11, reinforcement section ; 2cA12, first grinding section; 2cA2, second grinding rack; 2cA21, first transition section; 2cA22, second grinding section; 2cB, second grinding tooth; 2cB1, third grinding rack; 2cB11, second transition section; 2cB12, third grinding section; 2cB2, fourth grinding rack; 2cC, third grinding tooth; 30, discharge pipe; 301, tube cavity; 40, air guide pipe group; 41, intake pipe; 42, exhaust pipe; 50, driver; 51, motor; 52, driving wheel; 53, transmission belt; 54, driven wheel.

[0037] 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

[0038] 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.

[0039] 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.

[0040] like Figure 1 and Figure 2 As shown, in an embodiment of the present invention, a crushing device for recycling wood waste is provided, including a casing 10, a crushing grinding disc 20, a discharge pipe 30 and a driver 50, wherein the casing 10 is welded with stainless steel to form a cylindrical structure, a bracket 11 is arranged at the bottom of the casing 10 for supporting the casing 10 to remain stable during operation, a working chamber 102 is arranged inside the casing 10, and a feed port 101 connected to the working chamber 102 is arranged on the surface.

[0041] Furthermore, the crushing grinding disc 20 is arranged in the working chamber 102 and is used to crush the material in the working chamber 102. The discharge pipe 30 is fixedly arranged on the casing 10 and connected to the external negative pressure device. The driver 50 is arranged on the casing 10 and is used to drive the crushing grinding disc 20.

[0042] In some embodiments, the crushing grinding disc 20 includes a coaxially arranged movable grinding disc 2a and a fixed grinding disc 2b, the gap between the movable grinding disc 2a and the fixed grinding disc 2b is set as a crushing channel 200, the fixed grinding disc 2b is fixed in the working chamber 102, the movable grinding disc 2a is driven to rotate by the driver 50, a discharge port 201 is opened at the axial position of the fixed grinding disc 2b, and the suction end of the discharge pipe 30 is connected to the discharge port 201, so that the movable grinding disc 2a is driven to rotate by the driver 50 during operation, and the waste material between the movable grinding disc 2a and the fixed grinding disc 2b is ground and crushed by the relative rotation between the movable grinding disc 2a and the fixed grinding disc 2b, and under the action of the negative pressure device, the crushed wood chips will flow along the airflow to the discharge port 201 and be discharged.

[0043] Furthermore, grinding teeth 2c are fixedly provided on the surfaces of the movable grinding disc 2a and the fixed grinding disc 2b facing the crushing channel 200, and the spacing between the two groups of grinding teeth 2c gradually decreases along the radial direction, so that the material in the crushing channel 200 is crushed step by step from large to small along the radial direction. In this way, the entire device only needs to be equipped with at least one group of crushing grinding discs 20, so as to realize the uniform crushing of wood of various sizes into wood chips of target size. Compared with the setting of multi-stage crushing mechanism, it has the advantages of simple and compact structure, small number of mechanisms, and not easy to be damaged.

[0044] like Figure 5 As shown, the surface of the crushing grinding disc 20 facing the crushing channel 200 is set as the first surface, and the other side surface is set as the second surface.

[0045] The first surface is provided with a plurality of annular tooth areas along the radial direction, each annular tooth area includes a plurality of sector-shaped tooth areas distributed in a centrally symmetrical ring, and the angles of the plurality of sector-shaped tooth areas distributed along the same radial direction are the same, such as Figure 7 As shown, in some embodiments, the first surface is provided with a first tooth area 20A, a second tooth area 20B and a third tooth area 20C along the radial direction from the outside to the inside. It should be understood that the number of annular tooth areas is set according to usage requirements and is not limited to three, but can also be five, ten or more.

[0046] Furthermore, each sector-shaped tooth area is provided with more than one group of grinding teeth 2c, and along the circumferential direction, an air flow channel 2c0 is provided between two adjacent grinding teeth 2c in the same annular tooth area.

[0047] like Figure 7As shown, in some embodiments, the first tooth area 20A is provided with a first grinding tooth 2cA, the second tooth area 20B is provided with a second grinding tooth 2cB, and the third tooth area 20C is provided with a third grinding tooth 2cC, wherein the first grinding tooth 2cA includes a first grinding rack 2cA1 and a second grinding rack 2cA2 distributed in the circumferential direction, and an air flow channel 2c0 is provided between the first grinding rack 2cA1 and the second grinding rack 2cA2, which is conducive to the wood chips crushed by the first grinding tooth 2cA from the third tooth area 20C under the action of the air flow. The first tooth area 20A flows to the second tooth area 20B. The second grinding tooth 2cB includes a third grinding rack 2cB1 and a fourth grinding rack 2cB2 distributed in the circumferential direction. There is also an airflow channel 2c0 between the third grinding rack 2cB1 and the fourth grinding rack 2cB2. Under the action of the airflow, the wood chips crushed by the second grinding tooth 2cB flow from the second tooth area 20B to the third grinding tooth 2cC, so that the wood chips are crushed step by step and flow to the middle step by step, realizing multi-stage crushing and finally being discharged.

[0048] It should be understood that since the strength of the grinding teeth 2c is higher than that of the wood, although the grinding teeth 2c arranged on the outside are wider than the grinding teeth 2c arranged on the inside, the width of the grinding teeth 2c does not need to be increased after a certain value (5~8mm), which is sufficient to crush large pieces of wood. Therefore, the first grinding teeth 2cA can be set not only to two, but also to three, five or even more according to the area of ​​the first tooth area 20A.

[0049] Along the same radial direction, the grinding teeth 2c in two adjacent annular tooth areas are distributed continuously and / or discontinuously, such as Figure 7 As shown, in some embodiments, the first grinding rack 2cA1 and the third grinding rack 2cB1 are intermittently distributed, and the second grinding rack 2cA2, the fourth grinding rack 2cB2 and the third grinding rack 2cC are continuously distributed. In this way, the plurality of radially distributed airflow channels 2c0 also have gaps in the circumferential direction, so that the airflow can flow circumferentially to the airflow channels 2c0 on the side, promoting the flow of wood chips to the discharge port 201. It should be understood that the grinding teeth 2c in two adjacent annular tooth areas are continuous and / or intermittent and are not limited to Figure 7 As shown in the example, a relatively thin grinding tooth 2c, such as the third grinding tooth 2cC, can be connected to the adjacent third grinding rack 2cB1 or the fourth grinding rack 2cB2 to play a reinforcing role.

[0050] like Figure 7As shown, the first grinding rack 2cA1 includes a first grinding segment 2cA12 and a reinforcement segment 2cA11 distributed on the side of the first grinding segment 2cA12. The reinforcement segment 2cA11 is perpendicular to the first grinding segment 2cA12. The reinforcement segment 2cA11 can be distributed on one side or both sides of the first grinding segment 2cA12 to strengthen the structure of the first grinding segment 2cA12 and prevent the first grinding segment 2cA12 from deforming during contact with wood.

[0051] Furthermore, the second grinding rack 2cA2 includes a first transition section 2cA21 and a second grinding section 2cA22 which are continuously distributed from the outside to the inside in the radial direction, and the angle between the end face of the first transition section 2cA21 and the end face of the crushing grinding disc 20 is 45°~60°. The third grinding rack 2cB1 includes a second transition section 2cB11 and a third grinding section 2cB12 which are continuously distributed from the outside to the inside in the radial direction, and the angle between the end face of the second transition section 2cB11 and the end face of the crushing grinding disc 20 is 45°~60°.

[0052] In some embodiments, the grinding surface of the second grinding segment 2cA22 and the grinding surface of the fourth grinding rack 2cB2 are located in the same plane, the grinding surface of the third grinding segment 2cB12 and the grinding surface of the third grinding tooth 2cC are located in the same plane, the grinding surface height of the third grinding tooth 2cC>the grinding surface height of the fourth grinding rack 2cB2>the grinding surface height of the first grinding rack 2cA1, the wood is first ground by the first grinding rack 2cA1 in the first tooth area 20A at the outermost side, and then contacts the second grinding rack 2cA2 in the first tooth area 20A, so that the wood is ground and crushed by the second grinding rack 2cA2 on the basis of the initial crushing, and then enters the second tooth area 20B, is ground and crushed by the third grinding rack 2cB1 and the fourth grinding rack 2cB2, and finally enters the third tooth area 20C and is ground and crushed by the third grinding tooth 2cC.

[0053] The second grinding rack 2cA2 and the third grinding rack 2cB1 play a transition role, which can smoothly transition the wood between teeth of different crushing levels.

[0054] In some embodiments, at least one grinding rack or transition rack is provided in the same sector-shaped tooth area. In the case of including grinding racks and transition racks, the number of grinding racks is greater than or equal to the number of transition racks.

[0055] like Figure 2 As shown, the first surface is set as a stepped table top or a conical surface. Since the spacing between the grinding teeth 2c gradually decreases from the outside to the inside in the radial direction, when the first surface is set as a stepped table top or a conical surface, the height difference of the grinding teeth 2c will become smaller, thereby avoiding the reduction in strength caused by the gradual increase in the height of the grinding teeth 2c from the outside to the inside in the radial direction. The second surface is set as a plane, which can facilitate the installation of the crushing grinding disc 20.

[0056] Further, such as Figure 5 , Figure 6 and Figure 7 As shown, the grinding teeth 2c are configured as bar teeth distributed in the radial direction, and the surface of the grinding teeth 2c facing the crushing channel 200 is configured as a plane or a toothed surface. In particular, when the surface of the grinding teeth 2c is configured as a toothed surface, the crushing effect on the wood is better. The angle between the end face of the grinding tooth 2c away from the axis of the crushing grinding disc 20 and the second face is configured as an acute angle or a right angle. For example, the end face angles of the second grinding rack 2cA2 and the third grinding rack 2cB1 are both acute angles, which is conducive to the movement of the wood toward the center.

[0057] Furthermore, in the multiple annular tooth areas distributed along the same radial direction, the size of the grinding teeth 2c in the radial direction is configured to be equal or gradually increase from the outside to the inside, and the size of the grinding teeth 2c in the circumferential direction is configured to be equal or gradually decrease from the outside to the inside, that is, the length size of the grinding teeth 2c gradually increases from the outside to the inside or is set equally. During the crushing process, relatively small wood is not easy to directly contact the grinding teeth 2c. Therefore, the longer the length, the greater the probability of crushing small-sized wood. As the size of the wood becomes smaller and smaller, the size of the grinding teeth 2c also decreases accordingly. Therefore, the width size of the grinding teeth 2c gradually decreases from the outside to the inside or is set equally.

[0058] In some embodiments, within multiple sector-shaped tooth areas of the same group, the width of the crushing channel 200 along the circumferential direction is the same or cyclically distributed from large to small. In this way, wood of different sizes can be easily sheared and crushed in the crushing channel 200. For example, relatively large-sized wood enters the crushing channel 200 when the width of the crushing channel 200 is large. As the movable grinding disc 2a rotates, the width of the crushing channel 200 gradually decreases, and the wood is crushed.

[0059] like Figure 2 As shown, in some embodiments, two symmetrically distributed fixed grinding discs 2b are provided in the middle position of the working chamber 102, a positioning frame 2b1 is fixedly provided between the two fixed grinding discs 2b, and fixed to the inside of the casing 10 through the positioning frame 2b1, and a sealing ring 2b2 is fixedly installed on the circumferential side of the fixed grinding disc 2b, so that a closed air cavity 2b0 is formed between the two fixed grinding discs 2b, the discharge pipe 30 extends into the air cavity 2b0 and is connected to the discharge port 201, and a movable grinding disc 2a is provided on both sides of the fixed grinding disc 2b, the driver 50 includes a motor 51, a driving wheel 52, a transmission belt 53 and a driven wheel 54, the driven wheel 54 is fixedly connected to the movable grinding disc 2a through an axis passing through the casing 10, the output shafts on both sides of the motor 51 are fixedly connected to the driving wheel 52, and a transmission belt 53 is installed between the driving wheel 52 and the driven wheel 54, so that the motor 51 can drive the two groups of movable grinding discs 2a to rotate.

[0060] During operation, the double-axis motor 51 drives the two movable grinding discs 2a to rotate through the pulley transmission mechanism composed of the driving wheel 52, the transmission belt 53 and the driven wheel 54. The two groups of movable grinding discs 2a and the two groups of fixed grinding discs 2b respectively form two crushing channels 200, so that more wood can be crushed at the same time.

[0061] Further, such as Figure 3 and Figure 4 As shown, the device also includes an air duct group 40, which includes an air intake pipe 41 and an exhaust pipe 42 fixedly arranged on the casing 10, the input end of the air intake pipe 41 is connected to the external hot air device, and the output end of the air intake pipe 41 is connected to the lower end of the air cavity 2b0 and the lower end of the working cavity 102, the input end of the exhaust pipe 42 is connected to the upper end of the air cavity 2b0, and an air hole 2b01 is opened on the fixed grinding disc 2b, the air hole 2b01 is connected to the air cavity 2b0 and then to the crushing channel 200, and the air hole 2b01 is located between the grinding teeth 2c.

[0062] Whether to connect the air duct group 40 to the external hot air device is selected according to the humidity of the waste. When the humidity of the waste exceeds the set value (the moisture content must be lower than 40%), the gas of the set temperature (40°C~70°C) is introduced into the air cavity 2b0 through the air duct group 40. The hot air flow gathers in the ventilation cavity 2b0 and heats the fixed grinding disc 2b. The hot air flow can flow from the air hole 2b01 to the crushing channel 200 and contact the wood, so that the waste is dried during the crushing process.

[0063] like Figure 2 , Figure 5 and Figure 6 As shown, a guide cone 2a1 is provided at the middle position of the movable grinding disc 2a, and the guide cone 2a1 is coaxially distributed with the discharge port 201, and the cone tip of the guide cone 2a1 is in the discharge port 201. Under the action of the guide cone 2a1, the airflow will guide the wood chips toward the discharge port 201, so that the crushed wood chips enter the tube cavity 301 of the discharge pipe 30 from the discharge port 201 and are discharged.

[0064] The embodiment of the present invention provides a wood waste recycling crushing method, which uses the above-mentioned wood waste recycling crushing device, including the following steps:

[0065] Feeding: waste materials of different sizes are uniformly fed into the housing 10 from the feed port 101. After being fed, the waste materials will flow into the crushing channel 200 of different sizes according to their sizes and be crushed by the grinding teeth 2c in different areas.

[0066] Crushing: The waste will pass through the crushing channel 200 from the outside to the inside one by one, and will be ground and crushed by the corresponding grinding teeth 2c during the movement, so that when the waste finally reaches the discharge port 201, the degree of crushing of the waste can reach the set particle size. During operation, the driver 50 drives the movable grinding disc 2a to rotate, and the waste between the movable grinding disc 2a and the fixed grinding disc 2b is ground and crushed by the relative rotation between the movable grinding disc 2a and the fixed grinding disc 2b. Under the action of the negative pressure device, the crushed wood chips will flow along the air flow to the discharge port 201 and be discharged. The entire device only needs to be equipped with at least one set of crushing grinding discs 20, so as to realize the unified crushing of wood of different sizes into wood chips of target size. Compared with the setting of multi-stage crushing mechanism, it has the advantages of simple and compact structure, small number of mechanisms, and not easy to be damaged.

[0067] Discharge: Negative pressure is generated by an external negative pressure device, and the crushed waste chips are sucked and discharged from the discharge port 201 through the discharge pipe 30. Under the suction of negative pressure, air flow will continue to enter from the discharge port 201, and the air flow will promote the movement of wood to the center, which is beneficial to the step-by-step crushing of the wood.

[0068] In the crushing step, whether to connect the air duct group 40 to the external hot air device is selected according to the humidity of the waste. When the humidity of the waste exceeds the set value (the moisture content must be lower than 40%), the gas of the set temperature (40°C~70°C) is introduced into the air cavity 2b0 through the air duct group 40. The hot air flow gathers in the ventilation cavity 2b0 and heats the fixed grinding disc 2b. The hot air flow can flow from the air hole 2b01 to the crushing channel 200 and contact the wood, so that the waste is dried during the crushing process.

[0069] 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.

[0070] 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.

[0071] 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 crushing device for recycling wood waste, characterized in that: include: A working chamber (102) for placing materials to be crushed; A crushing grinding disc (20), arranged in the working chamber (102) and used for crushing materials in the working chamber (102); A driver (50) is drivingly connected to the crushing grinding disc (20) and is used to drive the crushing grinding disc (20); The crushing grinding disc (20) comprises a movable grinding disc (2a) and a fixed grinding disc (2b) which are coaxially arranged, the gap between the movable grinding disc (2a) and the fixed grinding disc (2b) being arranged as a crushing channel (200), the fixed grinding disc (2b) being fixed in the working chamber (102), the movable grinding disc (2a) being driven to rotate by the driver (50), and a discharge port (201) being arranged at the axis center of the fixed grinding disc (2b); Grinding teeth (2c) are fixedly provided on the surfaces of the movable grinding disc (2a) and the fixed grinding disc (2b) facing the crushing channel (200), and the spacing between the two groups of grinding teeth (2c) gradually decreases from outside to inside in the radial direction, so that the material in the crushing channel (200) is crushed step by step from large to small in the radial direction; The surface of the crushing grinding disc (20) facing the crushing channel (200) is set as a first surface, and the other side surface is set as a second surface. The first surface is provided with a first tooth area (20A), a second tooth area (20B) and a third tooth area (20C) from the outside to the inside in the radial direction. The first tooth area (20A) is provided with a first grinding rack (2cA1) and a second grinding rack (2cA2) distributed in the circumferential direction. The second tooth area (20B) is provided with a third grinding rack (2cB1) and a fourth grinding rack (2cB2) distributed in the circumferential direction. The third tooth area (20C) is provided with a third grinding tooth (2cC); The first grinding rack (2cA1) comprises a first grinding section (2cA12) and a reinforcement section (2cA11) distributed on the side of the first grinding section (2cA12), wherein the reinforcement section (2cA11) is perpendicular to the first grinding section (2cA12); the second grinding rack (2cA2) comprises a first transition section (2cA21) and a second grinding section (2cA22) which are continuously distributed from outside to inside in a radial direction, wherein an angle between an end face of the first transition section (2cA21) and an end face of the crushing grinding disc (20) is 45° to 60°; the third grinding rack (2cB1) comprises a second transition section (2cB11) and a third grinding section (2cB12) which are continuously distributed from outside to inside in a radial direction, wherein an angle between an end face of the second transition section (2cB11) and an end face of the crushing grinding disc (20) is 45° to 60°; The grinding surface of the second grinding section (2cA22) and the grinding surface of the fourth grinding rack (2cB2) are located in the same plane, the grinding surface of the third grinding section (2cB12) and the grinding surface of the third grinding tooth (2cC) are located in the same plane, the grinding surface height of the third grinding tooth (2cC) is greater than the grinding surface height of the fourth grinding rack (2cB2) and greater than the grinding surface height of the first grinding rack (2cA1), the first grinding rack (2cA1) and the third grinding rack (2cB1) are distributed intermittently, and the second grinding rack (2cA2), the fourth grinding rack (2cB2) and the third grinding tooth (2cC) are distributed continuously.

2. The wood waste recycling crushing device according to claim 1, characterized in that: It also includes a casing (10) and a discharge pipe (30); a feed port (101) communicating with the working chamber (102) is provided on the surface of the casing (10); the discharge pipe (30) is fixedly arranged on the casing (10) and connected to an external negative pressure device; a suction end of the discharge pipe (30) is communicated with the discharge port (201); and an air flow channel (2c0) is provided between two adjacent grinding teeth (2c).

3. The wood waste recycling crushing device according to claim 2, characterized in that: The first surface is configured as a stepped table surface or a conical surface, the second surface is configured as a plane, the grinding teeth (2c) are configured as strip teeth distributed in a radial direction, the surface of the grinding teeth (2c) facing the crushing channel (200) is configured as a plane or a tooth-shaped surface, the angle between the end surface of the grinding teeth (2c) away from the axis of the crushing grinding disc (20) and the second surface is configured as an acute angle or a right angle, and the size of the grinding teeth (2c) in the radial direction is configured to be equal or gradually increase from the outside to the inside.

4. The crushing device for recycling wood waste according to claim 2, characterized in that; The width of the crushing channels (200) along the circumferential direction is the same or cyclically distributed from large to small.

5. The wood waste recycling crushing device according to claim 2, characterized in that: Two symmetrically distributed fixed grinding discs (2b) are provided in the middle of the working chamber (102); a positioning frame (2b1) is fixedly provided between the two fixed grinding discs (2b) and is fixed inside the housing (10) via the positioning frame (2b1); and a sealing ring (2b2) ​​is fixedly installed on the circumference of the fixed grinding disc (2b), so that a closed air cavity (2b0) is formed between the two fixed grinding discs (2b); the discharge pipe (30) extends into the air cavity (2b0) and is connected to the discharge port (201).

6. The wood waste recycling crushing device according to claim 5, characterized in that: It also comprises an air guide pipe group (40), the air guide pipe group (40) comprising an air intake pipe (41) and an air exhaust pipe (42) fixedly arranged on the housing (10), the input end of the air intake pipe (41) being connected to an external hot air device, and the output end of the air intake pipe (41) being connected to the lower end of the air cavity (2b0) and the lower end of the working cavity (102), and the input end of the air exhaust pipe (42) being connected to the upper end of the air cavity (2b0); The fixed grinding disc (2b) is provided with an air hole (2b01), the air hole (2b01) is connected to the air cavity (2b0) and further to the crushing channel (200), and the air hole (2b01) is located between the grinding teeth (2c).

7. The wood waste recycling crushing device according to claim 6, characterized in that: A movable grinding disc (2a) is provided on both sides of the fixed grinding disc (2b); the driver (50) comprises a motor (51), a driving wheel (52), a transmission belt (53) and a driven wheel (54); the driven wheel (54) is fixedly connected to the movable grinding disc (2a) via a shaft passing through the housing (10); output shafts on both sides of the motor (51) are fixedly connected to the driving wheel (52); the transmission belt (53) is installed between the driving wheel (52) and the driven wheel (54), so that the motor (51) can drive the two sets of movable grinding discs (2a) to rotate.

8. The wood waste recycling crushing device according to claim 1, characterized in that: A guide cone (2a1) is provided at the middle position of the movable grinding disc (2a), the guide cone (2a1) is coaxially distributed with the discharge port (201), and the cone tip of the guide cone (2a1) is located in the discharge port (201).

9. A method for crushing wood waste for recycling, characterized in that: The crushing device for recycling wood waste according to claim 6 comprises the following steps: Feeding: uniformly feeding waste materials of different sizes into the casing (10) through the feed inlet (101); Crushing: waste materials will pass through the crushing channel (200) from the outside to the inside one by one, and will be ground and crushed by the corresponding grinding teeth (2c) during the movement; Discharging: negative pressure is generated by an external negative pressure device, and the crushed waste chips are sucked and discharged from the discharge port (201) through the discharge pipe (30); In the crushing step, whether the air guide pipe group (40) is connected to an external hot air device is selected according to the humidity of the waste, and when the humidity of the waste exceeds a set value, gas at a set temperature is introduced into the air cavity (2b0) through the air guide pipe group (40), so that the waste is dried during the crushing process.

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