Airflow laying device with sieve roller

Abstract

The application relates to the technical field of airflow paving, and discloses an airflow paving equipment with a sieve roller, which comprises a paving chamber formed by a conveying belt provided with a discharge port, a blowing device, a leading-out air device and a bottom, and at least one cylindrical rotary body with a surface capable of allowing airflow to pass through is arranged in the paving chamber. Through the technical scheme, the problems of low paving precision and unstable material dispersion after the paving output is improved in the prior art are solved.

Description

Technical Field

[0001] This invention relates to the field of airflow paving technology, and more specifically, to an airflow paving device with a screen roller. Background Technology

[0002] In the particleboard production industry, the laying of wood chips refers to the process of evenly and continuously spreading metered and glued wood chips into particleboard blanks before hot pressing, which determines the final performance and performance fluctuations of the board.

[0003] The requirements for the paving system depend on: (1) the type of raw material (material type, particle shape and weight); (2) the final product requirements (board structure, thickness and surface smoothness); and (3) the production capacity of the production line. This determines the working principle and number of paving heads.

[0004] The materials that make up the board blank are wood shavings, or uneven particles such as fibers, and dust, that is, they are composed of wood shavings of different sizes and shapes. For recycled wood raw materials, they may even contain high-density sand and gravel components. In order to achieve a smooth transition of wood shaving size in the thickness direction of the board blank and obtain a uniform and delicate surface, the wood shavings must be properly graded.

[0005] EP2626179B1 provides a composite surface layering head that combines a roller-type layering head and an air-flow layering head for recycled wood raw materials containing a large amount of impurities. The outstanding advantage of this combined layering head is that the airflow above the roller bed blows fine wood shavings onto the fine rollers suitable for grading fine wood shavings, which then form the outermost layer of the board blank. Heavier wood shavings such as particle wood shavings and mineral gravel are blown onto the coarse roller bed. At the same time, light, flaky wood shavings are also caught on the coarse roller bed by a screen arranged above the roller bed and separated into the board blank deeper from the board surface by the coarse rollers, thereby obtaining better board surface quality and edge performance.

[0006] However, in actual production, it has been proven that the material distributed by this type of paving device (shavings dispersing device) is not stable enough in the transverse direction of production. It is only suitable for small material quantities and laminar flow conditions where the airflow is relatively stable. When the material characteristics change, especially after the output increases, the airflow for dispersing the material also needs to be increased. The increased airflow velocity leads to the occurrence of turbulence. This turbulence is uncontrollable and causes the mixture to move around, resulting in fluctuations in the distribution of the slab (or material pad). Summary of the Invention

[0007] This invention proposes an airflow paving device with a screen roller, which solves the problems of low paving accuracy and unstable material dispersion in the prior art after increasing the paving output.

[0008] The technical solution of the present invention is as follows:

[0009] An airflow paving device with a screen roller includes a paving chamber consisting of a feed inlet, a blowing device, an exhaust device and a conveyor belt at the bottom, wherein at least one cylindrical rotating body with a surface permeable to airflow is provided in the paving chamber.

[0010] As a further technical solution, the surface of the cylindrical rotating body can be covered with a metal or non-metal screen.

[0011] As a further technical solution, the interior of the cylindrical rotating body is provided with several partitions at a certain distance, perpendicular to the central rotation axis.

[0012] As a further technical solution, a small hammer is provided inside the cylindrical rotating body. The small hammer is connected to the central rotation axis of the cylindrical rotating body through a rope, and the small hammer rotates with the central rotation axis of the cylindrical rotating body through the rope.

[0013] As a further technical solution, there are several small hammers, and the several small hammers are respectively arranged between adjacent partitions.

[0014] The working principle and beneficial effects of this invention are as follows:

[0015] In this invention, to solve the aforementioned technical problems, the proposed solution is to replace the vibrating screen with a cylindrical rotating body outside the damper grille. This cylindrical rotating body has baffles corresponding to the damper grille. During installation, the cylindrical rotating body not only stabilizes the airflow like a screen, but also reduces lateral material movement caused by unstable airflow within its range due to the baffles inside. Specifically, when the airflow carries material out of the damper grille, some material will move laterally with the unstable airflow. Before adding the roller screen, this lateral movement extends throughout the entire box; with the cylindrical rotating body, the lateral movement is confined to the baffles, significantly reducing lateral material movement within a limited area. Simultaneously, the cylindrical rotating body continuously rotates during normal operation, and a cleaning device continuously cleans the screen surface during its rotation, making it less prone to material adhesion compared to a conventional vibrating screen.

[0016] The cylindrical rotating body of this solution has multiple horizontally arranged partitions inside and a screen wrapped around its outer circumference. The cleaning device of this solution can be of various types, such as: several small hammers with wires are arranged along the axial direction of the cylindrical rotating body shaft inside the cylindrical rotating body (or each small hammer with wires corresponds to a partition space, and the small hammers with wires at different axial positions are evenly arranged along the circumference of the cylindrical rotating body shaft). During the rotation of the cylindrical rotating body, the wires of the small hammers are coiled up by the cylindrical rotating body shaft and tightened along with the hammers. Then, they are released in an instant, and the small hammers strike the screen surface due to gravity, realizing simultaneous rotation and vibration, causing the material adhering to the screen surface to fall off during the vibration. Attached Figure Description

[0017] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0018] Figure 1 This is a schematic diagram of the structure of the present invention;

[0019] Figure 2 This is a top view of the structure of the present invention;

[0020] Figure 3 This is a schematic diagram of the cylindrical rotating body structure with a screen according to the present invention;

[0021] Figure 4 This is a schematic diagram of the internal structure of the cylindrical rotating body of the present invention;

[0022] In the diagram: 1. Feed inlet, 2. Blowing device, 3. Exhaust device, 4. Conveyor belt, 5. Paving chamber, 6. Cylindrical rotating body, 7. Partition plate, 8. Small hammer, 9. Rope. Detailed Implementation

[0023] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0024] Example 1

[0025] like Figures 1-4 As shown, this embodiment proposes an airflow paving device with a cylindrical rotating body 6, including a paving chamber 5 consisting of a feed inlet 1, a blowing device 2, an exhaust device 3 and a conveyor belt 4 at the bottom. At least one cylindrical rotating body 6 with a surface that can be permeated by airflow is provided in the paving chamber 5.

[0026] The surface of the cylindrical rotating body 6 can be covered with a metal or non-metal screen.

[0027] The cylindrical rotating body 6 has several partitions 7 arranged at certain intervals and perpendicular to the central rotation axis.

[0028] In this embodiment, to solve the aforementioned technical problems, the proposed solution is to replace the vibrating screen with a cylindrical rotating body 6 outside the damper grille. The cylindrical rotating body 6 has baffles 7 corresponding to the damper grille. During installation, the cylindrical rotating body 6 not only stabilizes the airflow like a screen, but also reduces lateral material movement caused by unstable airflow within its range due to the baffles 7. Specifically, when the airflow carries material out of the damper grille, some material moves laterally with the unstable airflow. Before adding the roller screen, this lateral movement extends throughout the entire box; with the cylindrical rotating body 6, the lateral movement is confined to the baffles 7, significantly reducing lateral material movement within a limited area. Simultaneously, the cylindrical rotating body 6 rotates continuously during normal operation, and a cleaning device continuously cleans the screen surface during its rotation, making it less prone to material adhesion compared to a conventional vibrating screen.

[0029] The cylindrical rotating body 6 of this scheme has multiple horizontally arranged partitions 7 inside the cylindrical rotating body 6, and a layer of screen is wrapped around the outside along the circumference to form the cylindrical rotating body 6. The cleaning device of this scheme can be of various types, for example: several small hammers 8 with wires are arranged along the axial direction of the cylindrical rotating body 6 inside the cylindrical rotating body 6 (or each small hammer with wires 8 corresponds to a space in a partition 7, and the small hammers with wires 8 at different axial positions are evenly arranged along the circumference of the cylindrical rotating body 6, as shown in the figure). During the rotation of the cylindrical rotating body 6, the wire of the small hammers 8 is coiled up by the shaft of the cylindrical rotating body 6 and tightened along with the small hammers 8. Then, it is released for a moment, and the small hammers 8 strike the screen surface due to gravity, realizing rotation and vibration at the same time, so that the material adhering to the screen surface is dislodged in the vibration.

[0030] Example 2

[0031] Further, based on Embodiment 1, a small hammer 8 is provided inside the cylindrical rotating body 6. The small hammer 8 is connected to the central rotation axis of the cylindrical rotating body 6 through a rope 9, and the small hammer 8 rotates with the central rotation axis of the cylindrical rotating body 6 through the rope 9.

[0032] There are several small hammers 8, and the several small hammers 8 are respectively arranged between adjacent partitions 7.

[0033] In this embodiment, several small hammers 8 with wires are arranged along the axial direction of the cylindrical rotating body 6 inside the cylindrical rotating body 6 (or each small hammer 8 corresponds to a partition 7 space, and the small hammers 8 with wires arranged in different partition 7 spaces are evenly arranged along the circumference of the cylindrical rotating body 6). During the rotation of the cylindrical rotating body 6, the wire of the small hammer 8 is coiled up by the cylindrical rotating body 6 and tightened along with the small hammer 8. Then, it is released in an instant, and the small hammer 8 strikes the screen surface due to gravity. (Considering the phenomenon of the small hammer 8 tangling due to the length of the wire, this cleaning example needs to ensure that the length of the small hammer 8 with wires is greater than the distance from the cylindrical rotating body 6 axis to the screen surface of the cylindrical rotating body 6, and less than the circumference of the cylindrical rotating body 6 axis. This ensures that the screen of the cylindrical rotating body 6 can be struck, and since the length of the small hammer 8 with wires is less than the circumference of the cylindrical rotating body 6 axis, it will not tangle all the way around, thus avoiding the tangling phenomenon of the wire). Meanwhile, the small hammers 8 with wires are set in different positions on the circumference of the cylindrical rotating body 6 at different partition 7 positions. After the cylindrical rotating body 6 rotates once, multiple small hammers 8 with wires will strike the screen surface one by one to achieve rotation and vibration at the same time, causing the material stuck to the screen surface to fall off during vibration.

[0034] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An air-laying apparatus with a screen roll, comprising a laying chamber (5) with an inlet (1), a blowing device (2), an outlet air device (3) and a transport belt (4) at the bottom, characterized in that At least one cylindrical rotary body (6) is arranged in the paving chamber (5) and has a surface that can transmit airflow; A plurality of partitions (7) are arranged in the cylindrical rotary body (6) and are perpendicular to the central rotation axis of the cylindrical rotary body (6) at a certain interval; A small hammer (8) is arranged in the cylindrical rotary body (6), the small hammer (8) is connected to the central rotation axis of the cylindrical rotary body (6) through a rope (9), and the small hammer (8) rotates with the central rotation axis of the cylindrical rotary body (6) through the rope (9); The surface of the cylindrical rotary body (6) is covered with a metal or non-metal mesh.

2. An air-laid laying apparatus having a sifting roller according to claim 1, characterized in that A plurality of small hammers (8) are arranged between adjacent partitions (7).

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