Screw screening device

Abstract

The utility model belongs to the technical field of object separation treatment, and particularly relates to a screw screening device which comprises a rack used for achieving supporting. The rack has a first direction and a second direction which are horizontal and perpendicular to each other; the screening bin is supported through the rack, a feeding port is formed in the upper end of the screening bin, an opening penetrating through the screening bin is formed in the end, in the first direction, of the screening bin, a first discharging port is formed in the opening, and a second discharging port penetrating through the screening bin is formed in the bottom wall of the screening bin. The multiple screws are sequentially arranged side by side, the axial direction of the screws is parallel to the first direction, spiral blades are arranged on the outer circle faces of the screws in a surrounding mode, and the screws are arranged in an inner cavity of the screening bin. The heights of the multiple screws are gradually reduced along the center, close to the screening bin, in the second direction; the screening bin is provided with a reference surface passing through the center of the screening bin in the second direction, the reference surface is perpendicular to the second direction, the screws on the two sides of the reference surface are the first screw and the second screw respectively, and the first screw and the second screw are opposite in rotating direction.

Description

Technical Field

[0001] The utility model relates to the technical field of object separation, and more specifically to a screw screening device. Background Art

[0002] Size-based screening is a prerequisite for waste disposal and other material handling processes. For example, after waste is screened, it must be sorted into light and heavy materials, and recyclable and non-recyclable materials.

[0003] Related technical solutions use screw screening to achieve waste size screening. Specifically, multiple screws are arranged side by side horizontally in a screening chamber. The gap size between adjacent screws controls the size of the waste screened. That is, waste larger than the gap size is discharged along the screw's axial direction as the screw rotates, while waste smaller than the gap size falls through the gap between the two screws and is discharged through the discharge port.

[0004] In the above technical solution, the garbage is scattered and carried on top of multiple screws, resulting in the small-sized garbage falling to a relatively scattered point, which is difficult to collect in a centralized manner. A relatively large discharge port needs to be set up below for cooperation, and further collection of small-sized garbage is required in the future.

[0005] In addition, the technical solution is prone to the problem that the garbage is deflected toward one side due to the spiral direction of the screw, causing the screening bin or garbage to accumulate on one side, which in turn easily causes the garbage to be blocked in a local position of the screening bin. Utility Model Content

[0006] The purpose of the present invention is to overcome or at least alleviate the deficiencies of the above-mentioned prior art and to solve at least one of the above-mentioned technical problems.

[0007] To achieve the above objectives, the present invention provides a screw screening device comprising a frame, a screening chamber, and a plurality of screws arranged in a sequentially arranged parallel configuration. The frame is used for support and has a first direction and a second direction that are horizontal and mutually perpendicular. The screening chamber is supported by the frame. The upper end of the screening chamber has a feed opening. One end of the screening chamber along the first direction has an opening extending through the chamber, forming a first discharge opening at the opening. The bottom wall of the screening chamber is provided with a second discharge opening extending through the chamber.

[0008] The screws are axially parallel to the first direction, and are surrounded by spiral blades on their outer circumference. The screws are positioned within the inner cavity of the screening chamber. The height of the multiple screws gradually decreases as they approach the center of the screening chamber along the second direction. The screening chamber has a reference plane passing through its center along the second direction, which is perpendicular to the second direction. The multiple screws are symmetrical about the second direction. The screws on either side of the reference plane are the first and second screws, respectively, and the first and second screws rotate in opposite directions.

[0009] The beneficial effects of one or more of the above technical solutions are:

[0010] In this solution, a first discharge port is provided at one end of the screening bin along a first direction, a second discharge port is provided on the bottom wall of the screening bin, and multiple screws are arranged side by side in the screening bin, with the screw axes parallel to the first direction. This arrangement facilitates the use of the screws to convey garbage along the first direction, and during the process of the screws conveying garbage along the first direction, smaller garbage falls through the gaps between adjacent screws, thereby facilitating the discharge of garbage according to size from the first and second discharge ports.

[0011] In this solution, the heights of the multiple screws gradually decrease as they approach the center of the screening bin along the second direction. This arrangement makes it easier for the garbage above the screws to converge along the second direction toward the center of the screening bin, thereby making the landing point of the garbage relatively more concentrated and facilitating the collection of garbage that falls through the gaps between adjacent screws. In this solution, the screening bin has a reference plane passing through its own center along the second direction, the reference plane is perpendicular to the second direction, the first screw and the second screw on both sides of the reference are symmetrically arranged, and the rotation directions of the first screw and the second screw are opposite. This arrangement can prevent the garbage from converging toward one side of the screening bin along the first direction due to the same rotation direction of multiple screws, and prevent the garbage from converging in a local position in the screening bin and blocking the gap. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is an axonometric diagram of the overall structure of an embodiment of the present utility model;

[0013] Figure 2 This is an axonometric diagram of the overall structure in the second viewing direction in an embodiment of the present utility model;

[0014] Figure 3 This is an axonometric diagram of the overall structure in the third viewing direction in an embodiment of the present utility model;

[0015] Figure 4 It is a schematic front view of the overall structure in an embodiment of the present utility model.

[0016] Figure numerals: 1, frame; 2, first reduction motor; 3, second reduction motor; 4, screening bin; 5, second screw; 6, first screw; 7, sprocket; 41, first discharge port; 42, second discharge port; 43, vertical plate; 44, end plate; 46, side plate; 47, inclined wall; 48, flat plate. DETAILED DESCRIPTION

[0017] The following describes exemplary embodiments of the present invention with reference to the accompanying drawings. It should be understood that these specific descriptions are only used to teach those skilled in the art how to implement the present invention, and are not intended to exhaust all possible embodiments of the present invention, nor to limit the scope of the present invention.

[0018] Reference Figures 1-4 One or more embodiments of the present invention provide a screw screening device, comprising a frame 1, a screening bin 4, and a plurality of screws arranged side by side in sequence. The frame 1 is used to achieve support, and the frame 1 has a first direction and a second direction that are horizontal and perpendicular to each other. The screening bin 4 is supported by the frame 1, and the upper end of the screening bin 4 has a feed port, and one end of the screening bin 4 along the first direction has an opening that passes through itself, and a first discharge port 41 is formed at the opening, and the bottom wall of the screening bin 4 is provided with a second discharge port 42 that passes through itself. The axial direction of the screw is parallel to the first direction, and the outer circumferential surface of the screw is surrounded by a spiral blade, and the screw is arranged in the inner cavity of the screening bin 4. As it approaches the center of the screening bin 4 along the second direction, the height of the plurality of screws gradually decreases. The screening bin 4 has a reference plane passing through the center of itself along the second direction, and the reference plane is perpendicular to the second direction. The plurality of screws are symmetrical about the second direction. The screws on both sides of the reference plane are the first screw 6 and the second screw 5, respectively, and the first screw 6 and the second screw 5 have opposite rotation directions.

[0019] Specifically, the frame 1 is formed by a combination of multiple beams, wherein the beams include vertical beams, longitudinal beams along a first direction, and transverse beams along a second direction. The vertical beams, longitudinal beams, and transverse beams are connected in pairs.

[0020] In this embodiment, a first rotating power member and a second rotating power member are provided on the frame 1. The first rotating power member is used to cooperate with the first transmission mechanism to drive multiple first screws 6 to rotate synchronously, and the second rotating power member is used to cooperate with the second transmission mechanism to drive multiple second screws 5 to rotate synchronously.

[0021] In this embodiment, the first rotating power member and the second rotating power member are reduction motors, and the first transmission mechanism and the second transmission mechanism are sprocket 7 chain mechanisms.

[0022] Specifically, the two reduction motors are the first reduction motor 2 and the second reduction motor 3, and each screw rod passing through the screening bin 4 has a sprocket 7 coaxially fixed to one end. The sprockets 7 of all the first screw rods 6 are connected by a first chain (not shown in the figure), and the sprockets 7 of all the second screw rods 5 are connected by a second chain (not shown in the figure). One of the first screw rods 6 is directly coaxially fixed to the output shaft of the first reduction motor 2, and one of the second screw rods 5 is directly coaxially fixed to the output shaft of the second reduction motor 3.

[0023] In this embodiment, the screening bin 4 has an end plate 44 at one end away from the first discharge port 41 along the first direction, the screw is rotatably connected to the mounting hole on the end plate 44 through a bearing, and one end of the screw passes through the screening bin 4 from the end plate 44.

[0024] In this embodiment, a plurality of vertical plates 43 are arranged in sequence along the second direction on the end plate 44. Specifically, the height of the lower end of the vertical plate 43 is not lower than the height of the upper end of the screw.

[0025] Specifically, the vertical plate 43 is a triangular plate, one of the right-angled sides of the triangular plate is vertically arranged and fixed to the end plate 44, and the other right-angled side is horizontally arranged and extends toward the inner cavity of the screening bin 4. The vertical plate 43 and the end plate 44 are arranged perpendicularly.

[0026] In this embodiment, the rotation direction of the spiral blades on the first screw 6 and the second screw 5 is set to be able to provide a driving force to the material in the screening bin 4 in an inclined upward direction away from the second discharge port 42.

[0027] In this embodiment, the second discharge port 42 is symmetrically arranged with respect to the reference plane. Specifically, the second discharge port 42 is a square port. In other structural arrangements, the second discharge port 42 can be a circular port, an elliptical port, or other shapes, which can be configured by those skilled in the art.

[0028] In this embodiment, folding edges are respectively provided at both ends of the screening bin 4 along the second direction, and the folding edges are inclined downward from the upper end of the screening bin 4 and folded toward the inner side of the screening bin 4 .

[0029] In this embodiment, the cross-sectional size of the inner cavity of the screening bin 4 gradually decreases from top to bottom.

[0030] Specifically, the screening bin 4 has two inclined walls 47 symmetrical with respect to the reference plane, and the distance between the two inclined walls 47 decreases from top to bottom.

[0031] More specifically, the screening bin 4 in this embodiment includes the above-mentioned end plate 44 perpendicular to the first direction, and also includes two side plates 46 perpendicular to the second direction, and the two side plates 46 are connected by a bottom wall. The bottom wall includes a flat plate portion 48 at the lowest end and inclined walls 47 connected to the two ends of the flat plate portion 48 along the second direction, and the upper ends of the inclined walls 47 are connected to the lower ends of the side plates 46.

[0032] In order to increase the structural strength of the screening bin 4 , a structural beam spanning the inner cavity of the screening bin 4 is provided at the upper end of the screening bin, and both ends of the structural beam are fixed to the two side plates 46 respectively.

[0033] Working Principle: When this device is used, the reduction motor starts. Waste is released from the upper side of the screening bin 4, near the end plate 44. Driven by the screw, the waste moves toward the first discharge port 41. During this movement toward the first discharge port 41, some small-sized waste falls through the gaps between adjacent screws onto the bottom wall of the screening bin 4 below, and is discharged from the second discharge port 42. Larger waste is discharged from the first discharge port 41 along the axial direction of the screw.

[0034] The first screw 6 and the second screw 5 rotate in different directions, respectively causing the garbage to have a tendency to tilt upward and move away from the center of the screening bin 4 along the second direction, thereby reducing the probability of the garbage being blocked in the middle of the screening bin 4.

[0035] Of course, the present invention is not limited to the above embodiments. Those skilled in the art can make various combinations and modifications to the above embodiments of the present invention under the guidance of the present invention without departing from the scope of the present invention.

Claims

1. A screw screening device, characterized in that: include: A frame, which is used to achieve support; the frame has a first direction and a second direction that are horizontal and perpendicular to each other; A screening bin is supported by a frame, wherein the upper end of the screening bin has a feed port, one end of the screening bin along the first direction has an opening extending through the bin, and the opening forms a first discharge port, and the bottom wall of the screening bin is provided with a second discharge port extending through the bin; A plurality of screws are arranged in sequence side by side, with their axes parallel to the first direction, and spiral blades are arranged around the outer circumference of the screws. The screws are arranged in the inner cavity of the screening bin; the heights of the plurality of screws gradually decrease as they approach the center of the screening bin along the second direction; The screening bin has a reference plane passing through its center along the second direction, the reference plane is perpendicular to the second direction, the multiple screws are symmetrical about the second direction, the screws on both sides of the reference plane are the first screw and the second screw respectively, and the first screw and the second screw have opposite rotation directions.

2. The screw screening device according to claim 1, characterized in that: The frame is provided with a first rotating power member and a second rotating power member, the first rotating power member is used to cooperate with the first transmission mechanism to drive multiple first screws to rotate synchronously, and the second rotating power member is used to cooperate with the second transmission mechanism to drive multiple second screws to rotate synchronously.

3. The screw screening device according to claim 2, characterized in that: The first rotating power member and the second rotating power member are reduction motors, and the first transmission mechanism and the second transmission mechanism are sprocket chain mechanisms.

4. The screw screening device according to claim 1, characterized in that: The screening bin has an end plate at one end away from the first discharge port along the first direction, the screw is rotatably connected to the mounting hole on the end plate through a bearing, and one end of the screw passes through the screening bin from the end plate.

5. The screw screening device according to claim 4, characterized in that: The end plate is provided with a plurality of vertical plates sequentially arranged along the second direction.

6. The screw screening device according to claim 1, characterized in that: The rotation direction of the spiral blades on the first screw and the second screw is set to: be able to provide a driving force to the material in the screening bin in an inclined upward direction away from the second discharge port.

7. The screw screening device according to claim 1, characterized in that: The second discharge port is symmetrically arranged with respect to the reference plane.

8. The screw screening device according to claim 1, characterized in that: Folding edges are respectively provided at both ends of the screening bin along the second direction, and the folding edges are inclined downward from the upper end of the screening bin and folded toward the inner side of the screening bin.

9. The screw screening device according to claim 1, characterized in that: From top to bottom, the cross-sectional size of the inner cavity of the screening bin gradually decreases.

10. The screw screening device according to claim 9, characterized in that: The screening bin has two inclined walls that are symmetrical with respect to a reference plane, and a distance component between the two inclined walls decreases from top to bottom.

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