A wood raw material screening device

Abstract

A kind of timber raw material screening device, belong to density board processing technical field, including water selection groove, its inside is fixedly provided with partition, the inside of water selection groove is divided into upper space intercommunication sedimentation zone and conveying area, and the top end height of partition is lower than the groove wall height of water selection groove;Sedimentation zone is horizontally provided with convex strip corresponding to water selection groove inner wall periphery, and detachably provided with grid plate on convex strip;Sedimentation zone is filled with clean water for washing wood chip, and the water level of clean water is higher than grid plate and is flush with the top end height of partition;Conveying area is provided with grid conveyor belt along material conveying direction, and grid conveyor belt is movably installed in the water selection groove inner wall of conveying area by pivot, and one end of grid conveyor belt is close to partition setting, and the belt surface height is lower than the top end height of partition, and the other end of conveyor belt extends to water selection groove discharge port place.This device can improve the separation efficiency of light, heavy impurities, reduce wood chip conveying process jamming problem.

Description

Technical Field

[0001] This utility model relates to the field of MDF processing technology, specifically to a wood raw material screening device. Background Technology

[0002] In the production process of MDF, logs are crushed into wood chips of varying sizes. Then, heavy impurities, light impurities, and substandard wood chips are removed through screening to ensure the safety of equipment and the quality of the boards in subsequent hot grinding and pressing processes.

[0003] In actual production, wood raw material screening often suffers from incomplete impurity separation. Traditional screening devices rely heavily on single air separation or simple sieving, making it difficult to simultaneously process bark and softwood chips with small density differences, as well as metal fragments similar in size to wood chips. This results in a high impurity residue rate, which not only easily scratches the blades of the hot grinding mill and causes equipment failure, but also reduces the bonding strength and surface smoothness of the MDF. Furthermore, wood chip conveying is prone to jamming, and wood chips tend to stick together and accumulate in corners during transfer, requiring frequent cleaning, interfering with the continuous operation of the production line, and reducing the screening efficiency of wood raw materials. Utility Model Content

[0004] In view of the above situation and to overcome the defects of the prior art, the present invention provides a wood raw material screening device, which at least partially solves the problems mentioned in the background art.

[0005] The technical solution adopted by this utility model is as follows: A wood raw material screening device, comprising: A water separation tank is provided with an inlet at one end and an outlet at the other end. A partition is fixedly installed inside the water separation tank, which is arranged along the width of the water separation tank and divides the interior of the water separation tank into a sedimentation zone and a conveying zone that are interconnected in the upper space. The sedimentation zone is located near the inlet, and the conveying zone is located near the outlet. The top of the partition is lower than the height of the tank wall to allow water and materials in the sedimentation zone to flow into the conveying zone.

[0006] The sedimentation zone is provided with horizontal protrusions on the inner wall of the water selection tank, and a grid plate is detachably provided on the protrusions; the sedimentation zone is filled with clean water for washing wood chips, and the water level is higher than the grid plate and level with the top of the partition, so that the washed wood chips in the sedimentation zone can be pushed to the conveying zone by the water flow. A mesh conveyor belt is provided in the conveying area along the material conveying direction. The mesh conveyor belt is movably installed on the inner wall of the water separation tank in the conveying area via a rotating shaft. One end of the mesh conveyor belt is set close to the partition, and its belt surface height is lower than the top height of the partition, which is used to receive wood chips and water flowing in from the sedimentation area. The other end of the conveyor belt extends to the outlet of the water separation tank. The discharge port is semi-open, and its bottom surface is adapted to the height of the mesh conveyor belt.

[0007] In a further embodiment, a filter plate is provided in the conveying area of ​​the water separation tank, the filter plate is located directly below the mesh conveyor belt, and the filter plate is provided with a fine filter screen.

[0008] In a further embodiment, a linear insertion hole extending along the width of the water separation tank is provided below the discharge port. The width of the linear insertion hole is adapted to the thickness of the filter plate, and the filter plate is detachably and slidably connected in the linear insertion hole.

[0009] In a further embodiment, a water pump is installed on the outer wall of the water separation tank in the conveying area. The water inlet of the water pump passes through the water separation tank and is located below the filter plate in the conveying area. The water outlet of the water pump is connected to two corners of the sedimentation area near the feed inlet via pipelines.

[0010] In a further embodiment, a sealing plate is provided on the side wall of the sedimentation zone of the water separation tank and at the bottom of the sedimentation zone. The upper end of the sealing plate is hinged to the side wall of the water separation tank, and a locking device is provided on the lower edge of the sealing plate. The locking device includes a snap-locking structure.

[0011] In a further embodiment, a sealing strip is fixedly provided on the circumferential edge of the sealing plate, the sealing strip comprising a rubber strip.

[0012] In a further embodiment, a filter tank is provided below the sealing plate, and the top opening area of ​​the filter tank is not less than the area of ​​the sealing plate.

[0013] In a further embodiment, the top of the partition is provided with a semi-circular top surface.

[0014] The beneficial effects of this utility model by adopting the above structure are as follows: The sedimentation zone uses a grid plate to block wood chips and allows heavy impurities to settle. The conveying zone uses a mesh conveyor belt to trap qualified wood chips and allow light impurities to fall. Then, the wood chips are filtered a second time through a fine filter plate, forming a three-stage separation system of heavy impurity sedimentation, qualified wood chip trapping, and light impurity filtration. The total impurity removal rate is significantly improved, effectively avoiding equipment damage in subsequent hot grinding processes and ensuring the purity of raw materials for MDF processing.

[0015] The semi-circular top surface design of the partition allows the wood chips to transition smoothly along the arc surface to the conveying area under the push of water flow, solving the problems of wood chip tangling and accumulation that are prone to occur with traditional flat partitions. At the same time, the water pump delivers the filtered clean water from the conveying area to the corner of the feed inlet in the sedimentation area, forming a directional water flow to push the accumulated wood chips, which can avoid material retention, greatly improve the continuity of wood chip conveying, and reduce the frequency of downtime for cleaning.

[0016] The pump-driven clean water circulation system improves water resource utilization and reduces fresh water consumption; the sealing plate with sealing strip prevents leakage and can be opened and closed by hinge to discharge heavy impurities into the lower filter tank; the filter plate can be disassembled through linear insertion holes, and impurities can be cleaned without emptying the water selection tank, shortening maintenance time and reducing labor and energy costs. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the wood raw material screening device proposed in an embodiment of the present utility model; Figure 2 This is a top view of the wood raw material screening device proposed in an embodiment of this utility model; Figure 3 This is a schematic diagram of the internal structure of the wood raw material screening device proposed in an embodiment of this utility model.

[0018] Among them, 1. Water separation tank, 2. Feed inlet, 3. Discharge outlet, 4. Baffle, 5. Sedimentation zone, 6. Conveying zone, 7. Raised bar, 8. Grating plate, 9. Mesh conveyor belt, 10. Filter plate, 11. Linear insertion hole, 12. Water pump, 13. Water inlet end, 14. Water outlet end, 15. Sealing plate, 16. Locking device, 17. Sealing strip, 18. Filter tank.

[0019] The accompanying drawings are provided to further understand the embodiments and form part of the specification. They are used together with the embodiments for explanation and do not constitute a limitation on the embodiments. Detailed Implementation

[0020] The technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection.

[0021] In the description of the embodiments, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments.

[0022] In actual production, wood raw material screening often suffers from incomplete impurity separation. Traditional screening devices rely heavily on single air separation or simple sieving, making it difficult to simultaneously process bark and softwood chips with small density differences, as well as metal fragments similar in size to wood chips. This results in a high impurity residue rate, which not only easily scratches the blades of the hot grinding mill and causes equipment failure, but also reduces the bonding strength and surface smoothness of the MDF. Furthermore, wood chip conveying is prone to jamming, and wood chips tend to stick together and accumulate in corners during transfer, requiring frequent cleaning, interfering with the continuous operation of the production line, and reducing the screening efficiency of wood raw materials.

[0023] Recognizing the above problems, this application proposes and discloses a wood raw material screening device that can improve the separation efficiency of light and heavy impurities and reduce the problem of jamming and accumulation during the wood chip transportation process.

[0024] like Figure 1 , Figure 2 and Figure 3 As shown, this disclosure provides a wood raw material screening device, including: Water separation tank 1, with a feed inlet 2 at one end and a discharge outlet 3 at the other end; A partition 4 is fixedly installed inside the water separation tank 1. The partition 4 is set along the width direction of the water separation tank 1 and divides the interior of the water separation tank 1 into a sedimentation zone 5 and a conveying zone 6 that are interconnected in the upper space. The sedimentation zone 5 is set near the feed inlet 2 and the conveying zone 6 is set near the discharge outlet 3. The top height of the partition 4 is lower than the height of the tank wall of the water separation tank 1 so as to allow the water and materials in the sedimentation zone 5 to flow into the conveying zone 6.

[0025] The sedimentation zone 5 is provided with a horizontal ridge 7 on the inner wall of the water separation tank 1, and a grating plate 8 is detachably provided on the ridge 7. The sedimentation zone 5 is filled with clean water for washing wood chips, and the water level is higher than the grating plate 8 and level with the top of the partition plate 4, so that the washed wood chips in the sedimentation zone 5 can be pushed to the conveying zone 6 by the water flow.

[0026] In this embodiment, the mesh size of the grating plate 8 is smaller than the minimum size of the wood chips to be screened and larger than the maximum size of the heavy impurities, which is used to prevent the wood chips from falling into the bottom of the water separation tank 1, while allowing the heavy impurities to pass through the mesh and settle to the bottom of the sedimentation zone 5.

[0027] A mesh conveyor belt 9 is installed in the conveying area 6 along the material conveying direction. The mesh conveyor belt 9 is movably installed on the inner wall of the water separation tank 1 in the conveying area 6 via a rotating shaft. One end of the mesh conveyor belt 9 is set close to the partition 4, and its belt surface height is lower than the top height of the partition 4, which is used to receive wood chips and water flowing in from the sedimentation area 5. The other end of the conveyor belt extends to the outlet 3 of the water separation tank 1. The outlet 3 is semi-open, and its bottom surface is adapted to the belt surface height of the mesh conveyor belt 9.

[0028] In this embodiment, the semi-open discharge port 3 allows qualified wood chips on the mesh conveyor belt 9 to be smoothly discharged, while preventing water in the conveying area 6 from overflowing from the discharge port 3 in large quantities. The mesh hole size of the mesh conveyor belt 9 is smaller than the minimum size of qualified wood chips and larger than the maximum size of light impurities. It is used to allow light impurities and water to fall through the mesh holes during the conveyor belt process, while intercepting qualified wood chips and conveying them to the discharge port 3 so that the qualified wood chips can enter the next processing stage.

[0029] like Figure 1 and Figure 3 As shown, a filter plate 10 is provided in the conveying area 6 of the water separation tank 1. The filter plate 10 is located directly below the mesh conveyor belt 9 and is equipped with a fine filter screen.

[0030] In this embodiment, during the process of conveying wood chips by the mesh conveyor belt 9, lightweight impurities such as bark chips, fine wood chips, and floating matter that fall through the mesh of the mesh conveyor belt 9 with the water will be intercepted by the fine filter and adhere to the surface of the filter. The filtered water then falls through the fine filter to the bottom of the conveying area 6, thereby achieving the separation of lightweight impurities from the water.

[0031] like Figure 3 As shown, a linear insertion hole 11 extending along the width direction of the water separation tank 1 is provided below the discharge port 3. The width of the linear insertion hole 11 is adapted to the thickness of the filter plate 10, and the filter plate 10 is detachably and slidably connected in the linear insertion hole 11.

[0032] In this embodiment, when it is necessary to clean the light impurities on the filter plate 10, the filter plate 10 can be pulled outward along the extension direction of the linear insertion hole 11. After cleaning, the filter plate 10 can be pushed back to its original position along the insertion hole, so as to realize the quick disassembly and assembly of the filter plate 10 and the cleaning of impurities.

[0033] like Figure 1 , Figure 2 and Figure 3 As shown, a water pump 12 is installed on the outer wall of the water separation tank 1 in the conveying zone 6. The water inlet 13 of the water pump 12 passes through the water separation tank 1 and is located below the filter plate 10 in the conveying zone 6. The water outlet 14 of the water pump 12 is connected to two corners of the sedimentation zone 5 near the feed inlet 2 through a pipeline.

[0034] During operation, the water in sedimentation zone 5, carrying wood chips, flows over the partition 4 into the conveying zone 6. The water then falls onto the filter plate 10 via the mesh conveyor belt 9, where it is filtered by a fine mesh to remove light impurities, forming clean water that collects at the bottom of the conveying zone 6. The water pump 12 draws the filtered clean water through the inlet end 13 and then transports it through pipelines to the outlet end 14 at the two corners of sedimentation zone 5. From the outlet end 14, water is sprayed into the sedimentation zone 5, achieving the recycling of clean water between sedimentation zone 5 and conveying zone 6. Wood chips tend to accumulate at the two corners of sedimentation zone 5 away from the partition 4 during feeding. The water sprayed from the outlet end 14 creates a directional thrust, pushing the accumulated wood chips towards the direction of the partition 4 in sedimentation zone 5, ultimately guiding the wood chips over the partition 4 into the conveying zone 6, preventing the wood chips from accumulating at the corners of sedimentation zone 5.

[0035] like Figure 1 As shown, a sealing plate 15 is provided on the side wall of the sedimentation zone 5 of the water separation tank 1 and at the bottom of the sedimentation zone 5. The upper end of the sealing plate 15 is hinged to the side wall of the water separation tank 1, and a locking device 16 is provided on the lower edge of the sealing plate 15. The locking device 16 includes a snap-locking structure. The sealing plate 15 can be tightly fitted to the opening of the sedimentation zone 5 through the locking device 16 to achieve the sealing of the side wall of the sedimentation zone 5.

[0036] like Figure 1 As shown, a sealing strip 17 is fixedly provided on the circumferential edge of the sealing plate 15. The sealing strip 17 includes a rubber strip. When the sealing plate 15 is closed by the locking device 16, the sealing strip 17 can squeeze and fill the gap between the sealing plate 15 and the tank wall to prevent water in the sedimentation zone 5 from overflowing from the gap.

[0037] like Figure 1 and Figure 2 As shown, a filter tank 18 is provided below the sealing plate 15, and the top opening area of ​​the filter tank 18 is not less than the area of ​​the sealing plate 15.

[0038] When the amount of heavy impurities deposited at the bottom of sedimentation zone 5 reaches a certain level, turn off water pump 12 to stop water circulation, then open the locking device 16 of sealing plate 15 and rotate it around the hinge shaft to open sealing plate 15. At this time, the heavy impurities at the bottom of sedimentation zone 5 fall directly into the filter tank 18 below under the action of gravity. The heavy impurities are collected by the filter basket in the filter tank 18. After the impurities are cleaned, close sealing plate 15 and lock it with locking device 16 to restore normal operation of sedimentation zone 5.

[0039] In this embodiment, the top of the partition 4 is set in the form of a semi-circular top surface.

[0040] Under the thrust of the water flow, the wood chips in the sedimentation zone 5 move towards the baffle 4. The wood chips will slide smoothly upward along the arc surface of the semi-circular top surface and pass over the top of the baffle 4, avoiding the wood chips from getting stuck, accumulating or jamming at the top of the baffle 4. This significantly improves the smoothness of the transition of the wood chips from the sedimentation zone 5 to the conveying zone 6 and ensures the efficiency of material conveying.

[0041] It should be noted that, in this document, relational terms such as “first” and “second” are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0042] Although embodiments have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit, the scope of which is defined by the appended claims and their equivalents.

[0043] The embodiments have been described above, and such description is not restrictive. The figures shown are only one embodiment, and the actual structure is not limited to this. In short, if a person skilled in the art is inspired by this description and designs a similar structure and embodiment without departing from the inventive spirit, such design should fall within the scope of protection.

Claims

1. A wood raw material screening device, characterized in that, include: A water separation tank (1) is provided with an inlet (2) at one end and an outlet (3) at the other end. A partition (4) is fixedly provided inside the water separation tank (1). The partition (4) is arranged along the width direction of the water separation tank (1) and divides the interior of the water separation tank (1) into a sedimentation zone (5) and a conveying zone (6) that are interconnected in the upper space. The sedimentation zone (5) is located near the inlet (2) and the conveying zone (6) is located near the outlet. The feed inlet (3) is provided, and the top height of the partition (4) is lower than the height of the tank wall of the water separation tank (1) so as to allow the water and materials in the sedimentation zone (5) to flow into the conveying zone (6). The sedimentation zone (5) is provided with a horizontal convex strip (7) on the inner wall of the water separation tank (1), and a grid plate (8) is detachably provided on the convex strip (7). The sedimentation zone (5) is filled with clean water for cleaning wood chips, and the water level line is higher than the grid plate (8) and flush with the top height of the partition (4). The conveying area (6) is provided with a grid conveyor belt (9) along the material conveying direction. The grid conveyor belt (9) is movably installed on the inner wall of the water separation tank (1) of the conveying area (6) through a rotating shaft. One end of the grid conveyor belt (9) is set close to the partition (4), and its belt surface height is lower than the top height of the partition (4). The other end of the conveyor belt extends to the outlet (3) of the water separation tank (1). The discharge port (3) is semi-open, and its bottom surface is adapted to the height of the mesh conveyor belt (9).

2. The wood raw material screening device according to claim 1, characterized in that, The water selection tank (1) has a filter plate (10) in the conveying area (6). The filter plate (10) is located directly below the mesh conveyor belt (9). The filter plate (10) is equipped with a fine filter screen.

3. The wood raw material screening device according to claim 2, characterized in that, Below the discharge port (3) is a linear insertion hole (11) extending along the width direction of the water selection tank (1). The width of the linear insertion hole (11) is adapted to the thickness of the filter plate (10). The filter plate (10) is detachably and slidably connected in the linear insertion hole (11).

4. The wood raw material screening device according to claim 2, characterized in that, A water pump (12) is installed on the outer wall of the water selection tank (1) in the conveying area (6). The water inlet (13) of the water pump (12) passes through the water selection tank (1) and is located below the filter plate (10) in the conveying area (6). The water outlet (14) of the water pump (12) is connected to two corners of the sedimentation area (5) near the feed inlet (2) through a pipeline.

5. The wood raw material screening device according to claim 1, characterized in that, A sealing plate (15) is provided on the side wall of the sedimentation zone (5) of the water selection tank (1) and at the bottom of the sedimentation zone (5). The upper end of the sealing plate (15) is hinged to the side wall of the water selection tank (1). A locking device (16) is provided on the lower edge of the sealing plate (15). The locking device (16) includes a snap-locking structure.

6. The wood raw material screening device according to claim 5, characterized in that, The sealing plate (15) is fixedly provided with a sealing strip (17) on its circumferential edge, and the sealing strip (17) includes a rubber strip.

7. The wood raw material screening device according to claim 5, characterized in that, A filter pool (18) is provided below the sealing plate (15), and the top opening area of ​​the filter pool (18) is not less than the area of ​​the sealing plate (15).

8. The wood raw material screening device according to claim 1, characterized in that, The top of the partition (4) is set in a semi-circular shape.

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