Winnowing equipment for wood shaving particles

Abstract

The utility model provides a wood particle winnowing device which comprises a body, a winnowing cavity is limited in the body, a feeding port is formed in the upper portion of the winnowing cavity, a discharging port is formed in the lower portion of the winnowing cavity, and airflow input in the horizontal direction is arranged on the portion, located between the feeding port and the discharging port, of the winnowing cavity. Wood shaving particles with different particle sizes are blown into the discharging opening or the position outside the discharging opening under the action of the air flow; the conveying mechanism is arranged below the feeding port and comprises a plurality of licker-in rollers arranged at intervals, the licker-in rollers are constructed to have the same rotating direction so as to receive wood shaving particles falling from the feeding port, and at least one part of wood shaving particles with small particle sizes fall between every two adjacent licker-in rollers in the conveying process; the wood shaving particles with large particle sizes fall off from the output end, close to the airflow input position, of the conveying mechanism; a slag discharging opening communicated with the external environment is further formed in the position, located in front of the discharging opening, of the lower portion of the winnowing cavity.

Description

Technical Field

[0001] At least one embodiment of the utility model relates to the technical field of particleboard manufacturing, and more specifically, to an air separation device for particleboard particles. Background Art

[0002] Particleboard (including Grainwood) is mainly made of shavings formed by shavings of crop straw, wood, bamboo and other materials. Before making the board, the above-mentioned shavings need to be evenly mixed to form a uniform and dense core layer in the subsequent paving process. Due to individual differences in raw materials (such as the length of straw, the diameter of wood, the shape of bamboo pieces, etc.) and different characteristics of the materials, shavings of various lengths, shapes and qualities will be produced during the shaving process. Therefore, the shavings need to be sorted to remove at least a portion of the shavings with too small a particle size (such as debris formed by cutting wood) and too large a particle size (such as unbroken straw, wood blocks and bamboo blocks).

[0003] Among them, air separation is a more commonly used sorting method. At present, the air separation equipment used includes a main body with an air separation chamber formed inside, a feed port is provided above the main body, a discharge port is provided at the lower part, and an air flow arranged in the horizontal direction is arranged between the feed port and the discharge port to perform air separation during the falling process of the wood shavings. Particles with suitable particle sizes and particles with too large particle sizes and / or small particle sizes are blown to different positions in the air separation chamber, and finally particles with suitable particle sizes are discharged from the discharge port. On this basis, in order to improve the effect of air separation, a conveying mechanism can also be arranged below the feed port so that the wood shavings input from the feed port can pass through the air separation position where the air flow is formed more evenly.

[0004] However, in actual usage scenarios, the configured conveying mechanisms are mostly conveying mechanisms with continuous conveying surfaces (such as conveyor belts, etc.). Since wood shavings have relatively long fibers (such as straw, etc.), they are easily entangled and clumped into fiber balls during the process of input from the feed port and conveying by the conveying mechanism. This not only leads to uneven transmission, but also causes the entire ball to be blown away when facing airflow, making effective air separation impossible.

[0005] Therefore, how to effectively select wood shavings according to particle size has become a technical problem that needs to be solved urgently. Utility Model Content

[0006] In order to solve at least one technical problem in the prior art and other aspects, the utility model provides an air separation device for wood shavings particles, which limits the conveying direction by a plurality of licker-in rollers arranged at intervals to receive the wood shavings particles, and in the process of conveying the wood shavings particles, the thorns of the licker-in rollers catch the fiber clusters to separate the wood shavings particles in the fiber clusters, and the particles with smaller particle sizes wrapped in the fiber clusters are separated from the fiber clusters, so that the wood shavings particles can be evenly and effectively air separated in the air separation chamber.

[0007] The utility model provides an air selection device for wood shaving particles, comprising: a body, an air selection chamber is defined in the body, a feed port is arranged at the upper part of the air selection chamber, a discharge port is arranged at the lower part of the air selection chamber, and a part of the air selection chamber located between the feed port and the discharge port is provided with an air flow input in a horizontal direction, so that wood shaving particles of different particle sizes are blown down to a position in the discharge port or outside the discharge port under the action of the air flow; a conveying mechanism is arranged below the feed port, comprising a plurality of licker-in rollers arranged at intervals, and the plurality of licker-in rollers are constructed to have the same of rotation direction to receive the above-mentioned shavings particles falling from the above-mentioned feed port, and in the process of conveying, at least a part of the above-mentioned shavings particles with smaller particle size fall from between the two adjacent above-mentioned licker-in rollers, and the above-mentioned shavings particles with larger particle size fall from the output end of the above-mentioned conveying mechanism close to the input position of the airflow; wherein, a slag discharge port connected to the external environment is also provided at the lower part of the above-mentioned air selection chamber at a position before the above-mentioned discharge port, and the above-mentioned slag discharge port is arranged below the output end of the above-mentioned conveying mechanism to accommodate the above-mentioned shavings particles with larger particle size to pass through and be discharged from the above-mentioned air selection chamber.

[0008] According to an embodiment of the present invention, the plurality of licker-in rollers define a conveying direction that is opposite to the flow direction of the airflow.

[0009] According to an embodiment of the utility model, the licker-in roller near the feed inlet is configured to be higher than the licker-in roller away from the feed inlet, so that the plurality of licker-in rollers are limited to a conveying direction inclined downward.

[0010] According to an embodiment of the utility model, the air selection equipment further comprises a negative pressure mechanism, a negative pressure chamber is defined within the negative pressure mechanism, the negative pressure chamber is communicated with the air selection chamber, and the negative pressure chamber is arranged downstream of the discharge port.

[0011] According to an embodiment of the utility model, the above-mentioned negative pressure mechanism is arranged on the outer wall of the above-mentioned main body facing the flow direction of the airflow, and is connected with the above-mentioned air selection chamber through the air channel formed on the above-mentioned main body; wherein, the lower part of the above-mentioned negative pressure mechanism is provided with a platform suitable for receiving the above-mentioned wood shavings particles with smaller particle size, and the upper part of the above-mentioned negative pressure mechanism is provided with an exhaust pipe connected with an external exhaust mechanism, so as to suck at least a part of the above-mentioned wood shavings particles located in the above-mentioned negative pressure chamber to the outside of the above-mentioned negative pressure chamber.

[0012] According to an embodiment of the utility model, one end of the platform close to the air selection chamber is constructed to be higher than the other end away from the air selection chamber.

[0013] According to an embodiment of the utility model, a window is provided on the main body and / or the negative pressure mechanism.

[0014] According to an embodiment of the utility model, a rotatable flap is provided in the slag discharge port to open or close the slag discharge port.

[0015] According to an embodiment of the utility model, the flap is provided with a locking portion, which is suitable for keeping the flap at an opening angle to maintain the opening of the slag discharge port.

[0016] According to an embodiment of the utility model, the air selection device further comprises an air blowing mechanism arranged on the outer wall of the above-mentioned main body, which is suitable for inputting an airflow with adjustable wind speed into the above-mentioned air selection chamber.

[0017] According to the wind selection equipment for wood shavings provided by the utility model, the conveying direction is limited by a plurality of licker-in rollers arranged at intervals to receive the wood shavings, and in the process of conveying the wood shavings, different positions of the fiber clusters are hung on the thorns of different licker-in rollers, and in the process of relative rotation of adjacent licker-in rollers, the fiber clusters are stretched along the circumference of the licker-in rollers to separate into different wood shavings; and in the process of stretching the fiber clusters, the wood shavings with smaller particle sizes entrained in the fiber clusters are separated from the fiber clusters, and fall to the position with airflow through the gaps formed on the licker-in rollers before the conveying of the conveying mechanism for wind selection. In this way, the conveying of the wood shavings is made more uniform, and the wind selection of the wood shavings is made more effective. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural diagram of a wind selection device for wood shaving particles according to an exemplary embodiment of the utility model;

[0019] Figure 2 yes Figure 1 The schematic diagram of the flower particles of the exemplary embodiment shown is a schematic diagram of the air selection device for air selection; and

[0020] Figure 3 yes Figure 1 A stereoscopic view of the flap portion of the flower particle air selection device of the schematic embodiment shown.

[0021] In the accompanying drawings, the meanings of the reference numerals are as follows:

[0022] 1. Ontology;

[0023] 11. Discharge port;

[0024] 12. Feed inlet;

[0025] 13. Air inlet;

[0026] 14. Slag discharge port;

[0027] 15. Airway;

[0028] 2. Transmission mechanism;

[0029] 21. Motor;

[0030] 22. Licker-in;

[0031] 3. Blowing mechanism;

[0032] 4. Locking part;

[0033] 41. Flip board;

[0034] 42. Slide rail;

[0035] 43. Bracket;

[0036] 44. Axis;

[0037] 45. Hand wheel;

[0038] 5. Window;

[0039] 6. Negative pressure mechanism;

[0040] 61. Platform;

[0041] 62. Air extraction pipe;

[0042] 7. Wood shavings particles;

[0043] 71. First wood shavings particles;

[0044] 72. a second wood shaving particle; and

[0045] 73. The third wood shavings particles. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0047] The terms used herein are only for describing specific embodiments and are not intended to limit the present invention. The terms "include", "comprises", etc. used herein indicate the existence of features, steps, operations and / or components, but do not exclude the existence or addition of one or more other features, steps, operations or components.

[0048] All terms used herein, including technical and scientific terms, have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein should be interpreted as having a meaning consistent with the context of this specification, and should not be interpreted in an idealized or overly rigid manner.

[0049] When using expressions such as "at least one of A, B and C", it should generally be interpreted according to the meaning of the expression commonly understood by technical personnel in this field. For example, "a system having at least one of A, B and C" should include but is not limited to a system having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, C, etc.

[0050] Figure 1 It is a structural diagram of a wind selection device for wood shaving particles according to an illustrative embodiment of the utility model.

[0051] According to an embodiment of the utility model, a wind separation device for wood shavings particles is provided, such as Figure 1 As shown, it includes a body 1 and a conveying mechanism 2. An air selection chamber is defined in the body 1, a feed port 12 is provided at the upper part of the air selection chamber, and a discharge port 11 is provided at the lower part of the air selection chamber. The portion of the air selection chamber located between the feed port 12 and the discharge port 11 is provided with an air flow input in the horizontal direction, so that wood shavings 7 of different particle sizes are blown down to a position inside or outside the discharge port 11 under the action of the air flow. The conveying mechanism 2 is arranged below the feed port 12, and includes a plurality of licker-in rollers 22 arranged at intervals. The plurality of licker-in rollers 22 are configured to have the same rotation direction to receive the wood shavings 7 dropped from the feed port 12, and during the conveying process, at least a portion of the wood shavings 7 with a smaller particle size are dropped from between two adjacent licker-in rollers 22, and the wood shavings 7 with a larger particle size are dropped from the output end of the conveying mechanism 2 close to the input position of the air flow. A slag discharge port 14 connected to the external environment is also provided at the lower part of the air selection chamber before the discharge port 11. The slag discharge port 14 is arranged below the output end of the conveying mechanism 2 to accommodate wood shavings 7 with larger particle sizes to pass through and be discharged from the air selection chamber.

[0052] According to the embodiments of the present utility model, Figure 1 As shown, the air separation device for wood shaving particles further comprises an air blowing mechanism 3 arranged on the outer wall of the body 1, which is suitable for inputting an air flow with adjustable wind speed into the air separation chamber.

[0053] In an illustrative embodiment, Figure 1 As shown, the air blowing mechanism 3 includes but is not limited to a fan. Figure 1The upper wall shown in FIG. 1 is provided with an air inlet 13, and the exhaust end of the fan is arranged facing the air inlet 13, so that the portion between the feed inlet 12 and the discharge outlet 11 provided on the body forms an air flow (the air flow direction is configured as shown in FIG. Figure 1 The fan is arranged in a manner such that the wood shavings passing through the air selection chamber are selected by air flow. Furthermore, the power of the fan can be adjusted (such as by using a variable frequency control method) so that the air volume and wind speed of the fan can be adjusted to meet the requirements of wood shavings with different particle sizes.

[0054] Figure 2 yes Figure 1 The schematic diagram of the embodiment shown is a principle diagram of air separation of flower particles using an air separation device.

[0055] According to the embodiments of the present utility model, Figure 1 and Figure 2 As shown, the plurality of licker-in rollers 22 define a conveying direction that conveys in a direction opposite to the flow direction of the air flow.

[0056] According to the embodiments of the present utility model, Figure 1 and Figure 2 As shown, the licker-in rollers 22 on the side close to the feed inlet 12 are configured to be higher than the licker-in rollers 22 on the side away from the feed inlet 12, so that the plurality of licker-in rollers 22 are defined to be conveyed in an inclined downward direction.

[0057] According to the embodiments of the present utility model, Figure 1 and Figure 2 As shown, the air separation device for wood shaving particles further includes a negative pressure mechanism 6 , in which a negative pressure chamber is defined. The negative pressure chamber is communicated with the air separation chamber and is arranged downstream of the discharge port 11 .

[0058] In an illustrative embodiment, Figure 1 and Figure 2 As shown, the transmission mechanism 2 includes but is not limited to being configured with three licker-in rollers 22. In detail, one axial end of the three licker-in rollers 22 is connected to the output end of the motor 21 (including but not limited to using a belt, a pulley, or a gear, a chain), so that the torque output by the motor 21 drives the three licker-in rollers 22 to rotate in the same direction.

[0059] In an illustrative embodiment, Figure 2 As shown, at least one licker-in roller 22 (such as Figure 2 The licker-in roller 22 is arranged on the left side as shown in the figure, and the projection of the licker-in roller 22 along the vertical direction at least partially overlaps with the discharge port 12 to receive the wood shavings 7 dropped from the discharge port 12. Figure 2 left side as shown) to the other side (as shown Figure 2 The right side shown in the figure is gradually lowered so that the wood shavings falling from the feed port 12 are moved along the Figure 2As shown, it is transmitted in the downward right direction.

[0060] In such an implementation, Figure 2 As shown, the wood shavings 7 input from the feed port 12 fall onto the licker-in roller located on the left side under the action of their own weight, and the radially extending thorns arranged in the circumference of the licker-in roller are hung with the wood shavings 7 and / or the fiber clusters formed by the wood shavings 7 to convey the wood shavings 7 to the lower right direction; when the fiber clusters are simultaneously hung on two adjacent licker-in rollers 22, in response to the circumferential rotation of the licker-in rollers 22, the fiber clusters (including the wood shavings 7) are stretched and unfolded along the circumferential surface of the licker-in rollers 22, during which the first wood shavings 71 with a larger particle size (including those with a longer limit) continue to be conveyed downward, while a portion of the second wood shavings 72 and the third wood shavings 73 with a smaller particle size are exposed to the outside of the fiber cluster in response to the stretching of the fiber cluster, so as to fall through the gap between the two adjacent licker-in rollers 22 during the conveying process to the position with airflow below the conveying mechanism 2 for air selection, while the first wood shavings 71 are separated by air at the output end of the conveying mechanism (such as Figure 2 The right end shown in the figure falls between the inner wall of the main body 1 to a position with air flow for air separation.

[0061] Furthermore, the second shavings 72 and / or the third shavings 73 carried by the first shavings 71 are separated again under the action of the airflow; the third shavings 73 carried by the second shavings 72 are separated again under the action of the airflow, and are blown to different positions in the air selection chamber respectively, so that the shavings with suitable particle sizes are discharged through the discharge port 11, the shavings with too large particle sizes are discharged through the slag discharge port 14, and the shavings with too small particle sizes are blown to the downstream position of the discharge port 11. In this way, the transmission of the shavings is more uniform, and the air selection of the shavings is more effective.

[0062] refer to Figure 2 As shown, it should be understood that the wood shavings 7 of different particle sizes cannot be completely separated due to the characteristics of air separation. Therefore, the first wood shavings 71 (cross-section line portion), the second wood shavings 72 (inclined planing line portion) and the third wood shavings 73 (pointed planing line portion) shown in the figure are only schematic illustrations of the particle size types of the main wood shavings in the corresponding portion, and do not mean that the portion contains only one type of wood shavings (i.e., the cross-section line portion, the inclined planing line portion and the point planing line portion may contain wood shavings of three particle sizes).

[0063] According to the embodiments of the present utility model, Figure 1As shown, the negative pressure mechanism 6 is arranged on the outer wall of the body 1 facing the flow direction of the airflow, and is connected to the air selection chamber through the air channel 15 formed on the body 1. The lower part of the negative pressure mechanism 6 is provided with a platform 61 suitable for receiving wood shavings 7 with a smaller particle size, and the upper part of the negative pressure mechanism 6 is provided with an exhaust pipe 62 connected to an external exhaust mechanism to suck at least a part of the wood shavings 7 located in the negative pressure chamber to the outside of the negative pressure chamber.

[0064] In an illustrative embodiment, Figure 2 As shown, the upper part of the negative pressure mechanism 6 is constructed as a hood-shaped structure. In detail, the lower part of the hood-shaped structure is arranged to be open, and the upper part of the hood-shaped structure is arranged to be a narrow mouth with a cross-sectional size smaller than the open mouth. Further, the exhaust pipe 62 is arranged to be connected to the narrow mouth and the external exhaust mechanism (not shown in the figure). Among them, the exhaust mechanism (not shown in the figure) includes but is not limited to a negative pressure fan. Furthermore, the exhaust mechanism (not shown in the figure) is also equipped with a corresponding collection mechanism, such as a dust bag, etc., to collect the third wood shavings particles 73 with too small a particle size for reuse (such as for granulation, combustion or any other purpose).

[0065] It should be noted here that the vacuum mechanism is not the key point of protection of the present utility model. Any mechanism in the art that can be used to suck debris, powder or particles can be selected and applied, and no further details will be given.

[0066] According to the embodiments of the present utility model, Figure 2 As shown, one end of the platform 61 close to the air selection chamber is constructed to be higher than the other end away from the air selection chamber.

[0067] In an illustrative embodiment, Figure 2 As shown, the right end of the platform 61 is higher than the left end, so that at least a portion of the third wood shavings particles 73 can be accumulated in the negative pressure mechanism 6, so as to prevent the third wood shavings particles 73 with too small a particle size from being unable to be sucked out by the exhaust pipe 62 at one time due to the excessive concentration of the output of the third wood shavings particles 73; and when the operating state of the blowing mechanism (such as running or stopping) and the air volume and / or wind speed are adjusted, the third wood shavings particles 73 can also be prevented from falling into the discharge port 11.

[0068] According to the embodiments of the present utility model, Figure 1 As shown, a window 5 is provided on the body 1 and / or the negative pressure mechanism 6 .

[0069] In an illustrative embodiment, Figure 1As shown, an opening is formed at a position near the negative pressure mechanism 6 on the side wall of the main body 1, and a viewing window is installed in the opening. In detail, the viewing window 5 includes but is not limited to being made of acrylic, glass, tempered glass or any other transparent material, so that the operator can observe the air separation situation outside the air separation device for wood shavings. Furthermore, an inner frame is provided in the opening formed by the main body 1, and the viewing window 5 is mounted on the inner frame by a hinge so that the viewing window has an open state and a closed state. When the viewing window 5 is in the open state, the operator can enter the air separation chamber and / or the negative pressure chamber through the viewing window to clean and / or repair the air separation device for wood shavings (such as cleaning the wood shavings on the platform 61).

[0070] Figure 3 yes Figure 1 A stereoscopic view of the flap portion of the flower particle air selection device of the schematic embodiment shown.

[0071] According to the embodiments of the present utility model, Figure 1 and Figure 3 As shown, a rotatable flap 41 is provided in the slag discharge port 14 to open or close the slag discharge port 14 .

[0072] According to the embodiments of the present utility model, Figure 1 and Figure 3 As shown, the flap 41 is provided with a locking portion 4 , which is suitable for keeping the flap 41 at an open angle to maintain the opening of the slag discharge port 14 .

[0073] In an illustrative embodiment, Figure 3 As shown, one side of the flap 41 (such as Figure 3 The lower side of the main body 1 is connected to the shaft 44 and is configured to rotate around the axis with the shaft 44. Further, the two axial ends of the shaft 44 (the left end is shown in the figure) are passed through the bracket 43 and fixed to the two facing side walls of the main body 1 through the bracket 43. Furthermore, at least one end of the shaft 44 is equipped with a hand wheel 45 suitable for the operator to hold.

[0074] In an illustrative embodiment, Figure 3 As shown, an arc-shaped slide rail 42 is installed on the upper part of the bracket 43. In detail, a slideway extending in the extension direction of the slide rail 42 is provided on the slide rail 42. Furthermore, a through hole is provided at the position of the hand wheel 45 facing the slideway, and a bolt is detachably installed in the through hole to serve as a locking portion 4. Among them, when the bolt is sequentially inserted into the through hole and the slideway, a nut is sleeved on the screw part of the bolt so that the hand wheel and the slide rail are tightly pressed by the bolt and the nut, so that the position of the flap 41 relative to the slag discharge port 14 is locked, thereby maintaining the opening of the slag discharge port 14. Among them, the length of the flap 41 (such as Figure 3The distance between the two ends from the bottom right to the top shown in the figure) can be configured to be larger than the distance between the axis of the shaft 44 and the inner wall facing the slag discharge port 14. In this way, the shaft 44 (including the flap 41) can be rotated at a small angle to open or close the slag discharge port 14 (that is, the flap is at an angle with the horizontal plane in the closed state).

[0075] It should also be noted that the directional terms mentioned in the embodiments, such as "upper", "lower", "front", "back", "left", "right", etc., are only reference directions of the drawings and are not intended to limit the scope of protection of the present invention. Throughout the drawings, the same elements are represented by the same or similar reference numerals. Conventional structures or configurations will be omitted when they may cause confusion in the understanding of the present invention.

[0076] The embodiments of the present invention are described above. However, these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. Although the embodiments are described above separately, this does not mean that the measures in the various embodiments cannot be used in combination to advantage. The scope of the present invention is defined by the attached claims and their equivalents. Without departing from the scope of the present invention, a person skilled in the art may make a variety of substitutions and modifications, which should all fall within the scope of the present invention.

Claims

1. A wind selection device for wood shavings, characterized in that: include: A body (1), wherein a pneumatic chamber is defined in the body (1), a feed port (12) is arranged at the upper portion of the pneumatic chamber, a discharge port (11) is arranged at the lower portion of the pneumatic chamber, and a portion of the pneumatic chamber located between the feed port (12) and the discharge port (11) is provided with an airflow input in a horizontal direction, so that wood shavings (7) of different particle sizes are blown into the discharge port (11) or outside the discharge port (11) under the action of the airflow; and A conveying mechanism (2) is arranged below the feed port (12), and comprises a plurality of licker-in rollers (22) arranged at intervals, wherein the plurality of licker-in rollers (22) are configured to have the same rotation direction, so as to receive the wood shavings (7) dropped from the feed port (12), and during the conveying process, at least a portion of the wood shavings (7) with a smaller particle size drops from between two adjacent licker-in rollers (22), and the wood shavings (7) with a larger particle size drops from the output end of the conveying mechanism (2) close to the input position of the airflow; A slag discharge port (14) connected to the external environment is also provided at the lower part of the air selection chamber and in front of the discharge port (11). The slag discharge port (14) is arranged below the output end of the conveying mechanism (2) to accommodate the wood shavings (7) with larger particle size to pass through and be discharged from the air selection chamber.

2. The device according to claim 1, characterized in that The plurality of licker-in rollers (22) define a conveying direction in a direction facing the flow direction of the airflow.

3. The device according to claim 1, characterized in that The licker-in roller (22) on the side close to the feed inlet (12) is configured to be higher than the licker-in roller (22) on the side away from the feed inlet (12), so that the plurality of licker-in rollers (22) are limited to a conveying direction inclined downward.

4. The device according to any one of claims 1 to 3, characterized in that It also includes a negative pressure mechanism (6), wherein a negative pressure chamber is defined inside the negative pressure mechanism (6), the negative pressure chamber is communicated with the air selection chamber, and is arranged at a downstream position of the discharge port (11).

5. The device according to claim 4, characterized in that The negative pressure mechanism (6) is arranged on the outer wall of the body (1) facing the flow direction of the airflow, and is connected to the air selection chamber through an air passage (15) formed on the body (1); The lower part of the negative pressure mechanism (6) is provided with a platform (61) suitable for receiving the wood shavings (7) with a smaller particle size, and the upper part of the negative pressure mechanism (6) is provided with an exhaust pipe (62) connected to an external exhaust mechanism so as to suck at least a part of the wood shavings (7) located in the negative pressure chamber to the outside of the negative pressure chamber.

6. The device according to claim 5, characterized in that One end of the platform (61) close to the air selection chamber is constructed to be higher than the other end away from the air selection chamber.

7. The device according to claim 6, characterized in that A window (5) is provided on the main body (1) and / or the negative pressure mechanism (6).

8. The device according to any one of claims 1 to 3, characterized in that A rotatable flap (41) is provided in the slag discharge opening (14) to open or close the slag discharge opening (14).

9. The device according to claim 8, characterized in that The flap (41) is provided with a locking portion (4) adapted to keep the flap (41) at an opening angle so as to maintain the opening of the slag discharge port (14).

10. The device according to any one of claims 1 to 3, characterized in that It also includes an air blowing mechanism (3) arranged on the outer wall of the main body (1), which is suitable for inputting an air flow with adjustable wind speed into the air selection chamber.

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