Flexible and efficient wood chip screening device

Abstract

The utility model discloses a flexible and efficient wood chip screening device which comprises a storage box, a two-way conveying auger, a feeder, a first screening machine and a second screening machine. A feeding hole is formed in the top of the two-way conveying auger and is communicated with the discharging hole of the storage box; a first discharge port and a second discharge port are formed in the bottom of the two-way conveying auger; the first discharge hole, the feeder and the first screening machine are communicated with one another; the second discharge hole is communicated with the second screening machine; one first discharge port, one feeder and one first screening machine form a group of first screening components, and at least two groups of first screening components are arranged; and one second discharging opening and one second screening machine form a group of second screening assemblies, and the number of the second screening assemblies is at least two. The flexible and efficient wood chip screening device is small in occupied area and high in efficiency, the number of the working screening machines can be selected according to actual needs, and flexibility is high.

Description

Technical Field

[0001] The utility model relates to the technical field of screening equipment, in particular to a flexible and efficient wood chip screening device. Background Art

[0002] Wood chips are fragments or slices produced during wood processing, mainly obtained by sawing, cutting or planing logs / other wood materials. Depending on the type of wood and the processing method, the size, shape and texture of the wood chips obtained are also different.

[0003] Wood chips are widely used in many fields. In the papermaking industry, wood chips are an important raw material for making paper. After specific chemical and mechanical treatment, they can be converted into pulp and then made into paper. In the field of biomass energy, wood chips can be used as fuel to generate heat or electricity through combustion. In addition, wood chips can also be used to make furniture, decorative materials and wooden crafts.

[0004] Since wood chips may be of different sizes and shapes, they usually need to be screened before use. The main purpose of screening is to classify wood chips according to size so that they can better meet the needs of specific applications. The wood chip screening device is a key equipment to achieve this process. Through vibration and screening technology, wood chips can be effectively separated into different size grades.

[0005] In order to improve the screening efficiency, the existing wood chip screening device usually includes a storage box, a two-way conveying auger and two screening machines arranged in sequence from top to bottom, wherein the first discharge port of the storage box is interconnected with the feed port at the top of the two-way conveying auger, and the feed ports of the two screening machines are respectively interconnected with the two discharge ports at the bottom of the two-way conveying auger. That is, the existing screening device generally has only two screening machines working, resulting in low screening efficiency. When multiple screening machines are required to work, multiple wood chip screening devices need to be set up, resulting in a large footprint. At the same time, since a two-way conveying auger is only connected to two screening machines, the two screening machines must be started or shut down at the same time, that is, one of the screening machines cannot be made to work, and the flexibility is poor. Utility Model Content

[0006] The purpose of the utility model is to provide a flexible and efficient wood chip screening device, which has a small footprint, high efficiency, and can select the number of working screening machines according to actual needs, with high flexibility, so as to overcome the shortcomings of the prior art.

[0007] To achieve this purpose, the utility model adopts the following technical solutions:

[0008] A flexible and efficient wood chip screening device comprises a storage box, a two-way conveying auger, a feeder, a first screening machine and a second screening machine, wherein the storage box, the two-way conveying auger and the feeder are sequentially connected from top to bottom, and the first screening machine and the second screening machine are arranged in parallel below the feeder; the storage box is used to store wood chips;

[0009] A feed inlet is provided on the top of the bidirectional conveying auger, and the feed inlet is connected to the discharge port of the storage box;

[0010] The bottom of the bidirectional conveying auger is provided with a first discharge port and a second discharge port; the first discharge port, the feeder and the first screening machine are interconnected; the second discharge port and the second screening machine are interconnected;

[0011] The first discharge port, the feeder and the first screening machine form a group of first screening components, and the number of the first screening components is at least two, and the two groups of the first screening components are symmetrically distributed on both sides of the bottom of the bidirectional conveying auger;

[0012] One of the second discharge ports and one of the second screening machines constitutes a group of second screening components, and at least two groups of the second screening components are provided, and the two groups of the second screening components are symmetrically distributed at the two ends of the bottom of the bidirectional conveying auger.

[0013] Further, it also includes a bypass pipe and a gate valve;

[0014] The bypass pipe is located below the bidirectional conveying auger, and the bypass pipe is located between the first screening machine and the second screening machine; the gate valve is installed on the inner top of the bypass pipe;

[0015] A third discharge port is also provided at the bottom of the bidirectional conveying auger, and the third discharge port is communicated with the feed port of the bypass pipe.

[0016] Furthermore, the third discharge port, the bypass pipe and the gate valve form a group of bypass components, and there are at least two groups of the bypass components, and the two groups of the bypass components are symmetrically distributed on both sides of the bottom of the bidirectional conveying auger.

[0017] Furthermore, it also includes a conveying pipe, wherein the feed port of the conveying pipe is connected to the second discharge port, and the discharge port of the conveying pipe is connected to the feed port of the screening machine;

[0018] The cross-sectional shape of the conveying pipe is a trapezoid, and the width of the feed inlet of the conveying pipe is smaller than the width of the discharge outlet of the conveying pipe.

[0019] Furthermore, the first screening machine and the second screening machine have the same structure, and the first screening machine and the second screening machine are located on the same horizontal plane.

[0020] Furthermore, the bidirectional conveying auger comprises a variable speed motor, a conveying pipeline, a rotating shaft and a spiral blade group; the variable speed motor is installed at one end of the conveying pipeline;

[0021] The rotating shaft is rotatably mounted inside the conveying pipe, and the rotating shaft is connected to the output shaft of the variable speed motor, and the variable speed motor is used to drive the rotation of the rotating shaft;

[0022] The spiral blade group is installed outside the rotating shaft, and the spiral blade group conveys wood chips outward, and the feeding direction of the spiral blade group located on the left side of the rotating shaft is opposite to the feeding direction of the spiral blade group located on the right side of the rotating shaft;

[0023] The top of the conveying pipeline is provided with a feed port of the bidirectional conveying auger, and the bottom of the conveying pipeline is provided with a first discharge port, a second discharge port and a third discharge port of the bidirectional conveying auger.

[0024] Furthermore, the feed port of the bidirectional conveying auger is located at the top center of the conveying pipeline;

[0025] The spiral blade group includes a first spiral blade and a second spiral blade, and the first spiral blade and the second spiral blade are symmetrical about the rotation axis.

[0026] Furthermore, the bidirectional conveying auger also includes a conversion member, which is arranged between the variable speed motor and the rotating shaft, and the rotating shaft is detachably mounted on the variable speed motor through the conversion member.

[0027] Furthermore, the first discharge port of the bidirectional conveying auger is arranged close to the storage box 1 , and the second discharge port of the bidirectional conveying auger is arranged away from the storage box 1 .

[0028] Furthermore, the feeder is a star-shaped feeder.

[0029] The technical solution provided by the embodiment of the present application may include the following beneficial effects: the technical solution proposes a flexible and efficient wood chip screening device, which only needs one bidirectional conveying auger to realize the conveying of wood chips to four screening machines, and occupies a small area, thus solving the technical problem in the prior art that when multiple screening machines (referring to three or four screening machines) are needed to work, multiple wood chip screening devices need to be set up, resulting in a large area; at the same time, the number of working screening machines can be selected according to actual needs, which is highly flexible. In addition, in the technical solution, four screening machines can also work at the same time, which greatly improves work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the overall structure of a flexible and efficient wood chip screening device of the utility model.

[0031] Among them: a material storage box 1, a two-way conveying auger 2, a variable speed motor 21, a conveying pipeline 22, a rotating shaft 23 and a spiral blade group 24, a first spiral blade 241, a second spiral blade 242, a feeder 3, a first screening machine 4, a second screening machine 5, a bypass pipe 6, a gate valve 7, and a conveying pipe 8. DETAILED DESCRIPTION

[0032] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0033] The technical solution provides a flexible and efficient wood chip screening device, comprising a storage box 1, a two-way conveying auger 2, a feeder 3, a first screener 4 and a second screener 5, wherein the storage box 1, the two-way conveying auger 2 and the feeder 3 are sequentially connected from top to bottom, and the first screener 4 and the second screener 5 are arranged in parallel below the feeder 3; the storage box 1 is used to store wood chips;

[0034] A feed inlet is provided at the top of the bidirectional conveying auger 2, and the feed inlet is connected to the discharge port of the storage box 1;

[0035] The bottom of the bidirectional conveying auger 2 is provided with a first discharge port and a second discharge port; the first discharge port, the feeder 3 and the first screening machine 4 are interconnected; the second discharge port and the second screening machine 5 are interconnected;

[0036] The first discharge port, the feeder 3 and the first screening machine 4 form a group of first screening components, and the number of the first screening components is at least two, and the two groups of the first screening components are symmetrically distributed on both sides of the bottom of the bidirectional conveying auger 2;

[0037] One of the second discharge ports and one of the second screening machines 5 constitutes a group of second screening components. There are at least two groups of the second screening components, and the two groups of the second screening components are symmetrically distributed at the two ends of the bottom of the bidirectional conveying auger 2 .

[0038] In order to overcome the technical problems of large footprint, low efficiency and poor flexibility of the wood chip screening device in the prior art, the present technical solution proposes a flexible and efficient wood chip screening device, such as Figure 1As shown, it includes a storage box 1, a two-way conveying auger 2, a feeder 3, a first screener 4 and a second screener 5. The storage box 1, the two-way conveying auger 2 and the feeder 3, the first screener 4 and the second screener 5 are arranged in parallel below the feeder 3; the storage box 1 is used to store wood chips, and a feed port is provided on the top of the two-way conveying auger 2, and the feed port is connected with the first discharge port of the storage box 1. The wood chips are transported to the two-way conveying auger 2 through the storage box 1, which is simple and convenient.

[0039] Specifically, the bottom of the bidirectional conveying auger 2 is provided with a first discharge port and a second discharge port; the first discharge port, the feeder 3 and the first screening machine 4 are interconnected; the second discharge port and the second screening machine 5 are interconnected; a first discharge port, a feeder 3 and a first screening machine 4 are a group of first screening components, and the number of first screening components is at least two groups; a second discharge port and a second screening machine 5 are a group of second screening components, and the number of second screening components is at least two groups. The specific working process of the wood chip screening device in this technical solution is as follows: the wood in the storage box 1 enters the bidirectional conveying auger 2, and the bidirectional conveying auger 2 transports the wood chips in two opposite directions at the same time, so that the wood chips enter the feeder 3 through the first discharge port, and then enter the first screening machine 4 through the feeder 3, and the wood chips can also enter the second screening machine 5 through the second discharge port, so that the wood chips are screened by two first screening machines 4 and two second screening machines 5, that is, the wood chips are screened by four screening machines, which is efficient and fast. And in this process, when only two screening machines are needed to meet the actual use needs, the two feeders 3 can be closed, so that the two feeders 3 stop conveying wood chips to the corresponding two first screening machines 4, and the wood chips enter the other two second screening machines 5, so that only two screening machines are working; when only three screening machines are needed to meet the actual use needs, one of the feeders 3 can be closed, so that the closed feeder 3 stops conveying wood chips to one of the first screening machines 4, and the wood chips enter the other first screening machine 4 and the other two second screening machines 5, so that only three screening machines are working, which has high flexibility.

[0040] The technical solution proposes a flexible and efficient wood chip screening device. Since only one bidirectional conveying auger 2 is needed to convey wood chips to four screening machines, it occupies a small area. This solves the technical problem in the prior art that when multiple screening machines (referring to three or four screening machines) are needed to work, multiple wood chip screening devices need to be set up, resulting in a large area. At the same time, the number of working screening machines can be selected according to actual needs, which is highly flexible. In addition, in the technical solution, four screening machines can also work at the same time, which greatly improves work efficiency.

[0041] It should be noted that the first screening machine 4 and the second screening machine 5 are both common screening machines in the prior art, and their structures are not described in detail here.

[0042] Further explanation, it also includes a bypass pipe 6 and a gate valve 7;

[0043] The bypass pipe 6 is located below the bidirectional conveying auger 2, and the bypass pipe 6 is located between the first screening machine 4 and the second screening machine 5; the gate valve 7 is installed on the inner top of the bypass pipe 6;

[0044] A third discharge port is also provided at the bottom of the bidirectional conveying auger 2 , and the third discharge port is communicated with the feed port of the bypass pipe 6 .

[0045] In a preferred embodiment of the present technical solution, by providing a bypass pipe 6, a gate valve 7 and a third discharge port, when only one screening machine is required to work, the two feeders 3 are closed, the gate valve 7 is opened, and the wood chips passing through the gate valve 7 fall into the bypass pipe 6, so that the wood chips only enter one of the second screening machines 5 through the second discharge port on the other side opposite to the gate valve 7, thereby realizing that only one screening machine is working; when two screening machines are required to work, the gate valve 7 can be opened, one of the feeders can be closed, and the wood chips can pass through the other one. The wood chips enter the first screening machine 4 through the feeder 3 and enter one of the second screening machines 5 through the second discharge port on the other side opposite to the gate valve 7, so that only two screening machines are working; at the same time, the two feeders 3 can be closed, and the gate valve 7 can be closed to stop the two feeders 3 from conveying wood chips to the corresponding two first screening machines 4, and the wood chips enter the two second screening machines 5, so that only two screening machines are working; when three screening machines 4 or four screening machines 4 are needed to work, the same can be done accordingly, thereby improving the flexibility of the device.

[0046] To further explain, the third discharge port, the bypass pipe 6 and the gate valve 7 form a bypass component, and there are at least two groups of the bypass components, and the two groups of the bypass components are symmetrically distributed on both sides of the bottom of the bidirectional conveying auger 2.

[0047] In a preferred embodiment of the present technical solution, by setting two sets of bypass components, when only one screening machine is needed to work, the two sets of bypass components can be opened, one feeder 3 can be closed, and the wood chips can enter the first screening machine 4 through the other feeder 3, so that only one screening machine can work; or one set of bypass components can be opened, and the two feeders 3 can be closed, so that the wood chips can enter the second screening machine 5 on the side where the bypass components are not opened through the second discharge port, so that only one screening machine can work; when two screening machines are needed to work, Open two sets of bypass components, open two feeders 3, so that the wood chips enter the corresponding first screening machines 4 through the two feeders 3, so that only two screening machines are working; you can also close the two feeders 3, so that the two feeders 3 stop conveying wood chips to the corresponding two first screening machines 4, and the wood chips enter the two second screening machines 5 through the second discharge port, so that only two screening machines are working; when three screening machines 4 or four screening machines 4 are needed to work, it can be deduced in the same way, so as to further improve the flexibility of the device. At the same time, when any one of the first screening machines 4 or any one of the second screening machines 5 is damaged or needs maintenance, the other first screening machines 4 and second screening machines 5 can also be opened or closed according to actual needs, which has little impact on production capacity.

[0048] Further explanation, it also includes a conveying pipe 8, the feed port of the conveying pipe 8 is connected to the second discharge port, and the discharge port of the conveying pipe 8 is connected to the feed port of the screening machine 4;

[0049] The cross-sectional shape of the conveying pipe 8 is a trapezoid, and the width of the feed port of the conveying pipe 8 is smaller than the width of the discharge port of the conveying pipe 8 .

[0050] In a preferred embodiment of the present technical solution, a conveying pipe 8 is provided to play a role of buffering and regulating to ensure the stability of the device operation. At the same time, the shape of the conveying pipe 8 is limited to a trapezoidal shape, which is conducive to reducing the resistance of the sheet flowing in the pipeline, making the sheet conveying smoother, thereby reducing energy consumption.

[0051] It is further explained that the first screening machine 4 and the second screening machine 5 have the same structure, and the first screening machine 4 and the second screening machine 5 are located on the same horizontal plane.

[0052] In a preferred embodiment of the present technical solution, by limiting the structure of the first screening machine 4 and the second screening machine 5, the following effects are achieved: first, it allows operators to more easily master their operating principles and operation methods, reducing the risk of misoperation caused by operating different equipment. At the same time, when performing equipment maintenance and overhaul, maintenance personnel do not need to perform different operations for different structures, thereby improving work efficiency; second, when it is necessary to replace or upgrade the first screening machine 4 and the second screening machine 5, due to the same structure, replacement or upgrading work can be carried out more easily, reducing the extra workload caused by structural differences; third, the first screening machine 4 and the second screening machine 5 with the same structure will also perform more consistently in terms of screening efficiency, processing capacity, screening accuracy, etc., which helps to ensure the stability and reliability of the entire screening device.

[0053] Furthermore, the first screening machine 4 and the second screening machine 5 are located on the same horizontal plane, which has the following effects: First, when the first screening machine 4 and the second screening machine 5 are located at the same height, the operator can observe, monitor and operate more easily without frequently adjusting the viewing angle or changing the position, thereby reducing the difficulty of operation and improving work efficiency; Second, the first screening machine 4 and the second screening machine 5 are located at the same height, which makes the layout of the entire screening device more compact and reasonable, which is conducive to saving space and reducing the floor area, and is also convenient for the installation, commissioning and maintenance of the equipment; Third, the first screening machine 4 and the second screening machine 5 located at the same height can reduce the safety risks such as falling that may occur when the operator moves between equipment at different heights, and is also convenient for setting up unified safety protection facilities to improve the safety of the entire screening device.

[0054] Further, the bidirectional conveying auger 2 includes a variable speed motor 21, a conveying pipe 22, a rotating shaft 23 and a spiral blade group 24; the variable speed motor 21 is installed at one end of the conveying pipe 22;

[0055] The rotating shaft 23 is rotatably installed inside the conveying pipe 22, and the rotating shaft 23 is connected to the output shaft of the variable speed motor 21, and the variable speed motor 21 is used to drive the rotating shaft 23 to rotate;

[0056] The spiral blade group 24 is installed outside the rotating shaft 23, and the spiral blade group 24 conveys wood chips outward, and the feeding direction of the spiral blade group 24 located on the left side of the rotating shaft 23 is opposite to the feeding direction of the spiral blade group 24 located on the right side of the rotating shaft 23;

[0057] The top of the conveying pipeline 22 is provided with a feed port of the bidirectional conveying auger 2 , and the bottom of the conveying pipeline 22 is provided with a first discharge port, a second discharge port and a third discharge port of the bidirectional conveying auger 2 .

[0058] In a preferred embodiment of the present technical solution, a variable speed motor 21, a conveying pipe 22, a rotating shaft 23 and a spiral blade group 24 are arranged, and the variable speed motor 21 drives the rotating shaft 23 to rotate, and the rotating shaft 23 drives the rotating spiral blade group 24 to rotate, so that the wood chips are pushed from the feed port to the first discharge port, the second discharge port and the third discharge port, and the feeding direction of the spiral blade group 24 located on the left side of the rotating shaft 23 is opposite to the feeding direction of the spiral blade group 24 located on the right side of the rotating shaft 23, which is conducive to the bidirectional conveying auger 2 to realize the conveying of wood chips in two opposite directions, thereby greatly improving the conveying efficiency.

[0059] It is further explained that the feed port of the bidirectional conveying auger 2 is located at the top center of the conveying pipeline 22;

[0060] The spiral blade set 24 includes a first spiral blade 241 and a second spiral blade 242 . The first spiral blade 241 and the second spiral blade 242 are symmetrical with respect to the rotation shaft 23 .

[0061] By setting the first spiral blade 241 and the second spiral blade 242, it is possible to transport wood chips in two opposite directions, which greatly improves the transportation efficiency. At the same time, the feed port of the two-way conveying auger 2 is located at the top center of the conveying pipe 22, and the first spiral blade 241 and the second spiral blade 242 are symmetrical about the rotating shaft 23, so that the conveying amount of wood chips on the left and right sides of the two-way conveying auger 2 is the same, which is beneficial to improving the operating stability of the device.

[0062] Further, the bidirectional conveying auger 2 further includes a conversion member, which is arranged between the variable speed motor 21 and the rotating shaft 23, and the rotating shaft 23 is detachably mounted on the variable speed motor 21 through the conversion member.

[0063] In a preferred embodiment of the present technical solution, a conversion member (not shown in the figure) is provided so that the variable speed motor 21 and the rotating shaft 23 are detachably connected to facilitate maintenance and installation.

[0064] It should be noted that the conversion member can be a coupling, which is not limited here.

[0065] It is further explained that the first discharge port of the bidirectional conveying auger 2 is arranged close to the storage box 1, and the second discharge port of the bidirectional conveying auger 2 is arranged away from the storage box 1.

[0066] In a preferred embodiment of the present technical solution, the first discharge port close to the storage box 1 can realize efficient and rapid transmission of wood chips, save transmission energy consumption, and help reduce production costs; the second outlet originally from the storage box 1 can be used as a buffer station to help balance the wood chip flow of the entire screening device and prevent wood chip blockage or shortage. The mutual coordination of the first discharge port and the second discharge port setting positions of the two-way conveying auger 2 is conducive to improving the advantages of the two-way conveying auger 2 with both efficient feeding and flexible layout, and can be adjusted and optimized according to the specific needs of the production line.

[0067] It is further explained that the feeder 3 is a star-shaped feeder.

[0068] Compared with other feeders, the star-shaped feeder has the characteristics of compact structure, beautiful appearance, safe and reliable use, light weight, large capacity, low power consumption, etc. In addition, since the star-shaped feeder adopts the chamber-stopped air pulse jet cleaning technology, the cleaning cycle is extended, the cleaning energy consumption is reduced, and the life of the equipment is increased. Therefore, in a preferred embodiment of the present technical solution, the feeder 3 is preferably a star-shaped feeder, which increases the service life of the equipment, reduces energy consumption, and thus saves production costs.

[0069] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0070] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps described in these embodiments do not limit the scope of the utility model. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0071] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present utility model; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0072] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0073] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.

[0074] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0075] The technical principle of the present invention is described above in combination with specific embodiments. These descriptions are only for explaining the principle of the present invention and cannot be interpreted as limiting the protection scope of the present invention in any way. Based on the explanations here, technicians in this field can think of other specific implementation methods of the present invention without creative work, and these methods will fall within the protection scope of the present invention.

Claims

1. A flexible and efficient wood chip screening device, characterized by: It comprises a storage box, a two-way conveying auger, a feeder, a first screener and a second screener, wherein the storage box, the two-way conveying auger and the feeder are sequentially connected from top to bottom, and the first screener and the second screener are arranged in parallel below the feeder; the storage box is used to store wood chips; A feed inlet is provided on the top of the bidirectional conveying auger, and the feed inlet is connected to the discharge port of the storage box; The bottom of the bidirectional conveying auger is provided with a first discharge port and a second discharge port; the first discharge port, the feeder and the first screening machine are interconnected; the second discharge port and the second screening machine are interconnected; The first discharge port, the feeder and the first screening machine form a group of first screening components, and the number of the first screening components is at least two, and the two groups of the first screening components are symmetrically distributed on both sides of the bottom of the bidirectional conveying auger; One of the second discharge ports and one of the second screening machines constitutes a group of second screening components, and at least two groups of the second screening components are provided, and the two groups of the second screening components are symmetrically distributed at the two ends of the bottom of the bidirectional conveying auger.

2. A flexible and efficient wood chip screening device according to claim 1, characterized in that: Also includes bypass pipe and gate valve; The bypass pipe is located below the bidirectional conveying auger, and the bypass pipe is located between the first screening machine and the second screening machine; the gate valve is installed on the inner top of the bypass pipe; A third discharge port is also provided at the bottom of the bidirectional conveying auger, and the third discharge port is communicated with the feed port of the bypass pipe.

3. A flexible and efficient wood chip screening device according to claim 2, characterized in that: The third discharge port, the bypass pipe and the gate valve form a bypass component. There are at least two groups of bypass components, and the two groups of bypass components are symmetrically distributed on both sides of the bottom of the bidirectional conveying auger.

4. A flexible and efficient wood chip screening device according to claim 1, characterized in that: It also includes a conveying pipe, wherein the feed port of the conveying pipe is connected to the second discharge port, and the discharge port of the conveying pipe is connected to the feed port of the screening machine; The cross-sectional shape of the conveying pipe is a trapezoid, and the width of the feed inlet of the conveying pipe is smaller than the width of the discharge outlet of the conveying pipe.

5. A flexible and efficient wood chip screening device according to claim 4, characterized in that: The first screening machine and the second screening machine have the same structure, and the first screening machine and the second screening machine are located on the same horizontal plane.

6. A flexible and efficient wood chip screening device according to claim 1, characterized in that: The bidirectional conveying auger comprises a variable speed motor, a conveying pipeline, a rotating shaft and a spiral blade group; the variable speed motor is installed at one end of the conveying pipeline; The rotating shaft is rotatably mounted inside the conveying pipe, and the rotating shaft is connected to the output shaft of the variable speed motor, and the variable speed motor is used to drive the rotation of the rotating shaft; The spiral blade group is installed outside the rotating shaft, and the spiral blade group conveys wood chips outward, and the feeding direction of the spiral blade group located on the left side of the rotating shaft is opposite to the feeding direction of the spiral blade group located on the right side of the rotating shaft; The top of the conveying pipeline is provided with a feed port of the bidirectional conveying auger, and the bottom of the conveying pipeline is provided with a first discharge port, a second discharge port and a third discharge port of the bidirectional conveying auger.

7. A flexible and efficient wood chip screening device according to claim 6, characterized in that: The feed port of the bidirectional conveying auger is located at the top center of the conveying pipeline; The spiral blade group includes a first spiral blade and a second spiral blade, and the first spiral blade and the second spiral blade are symmetrical about the rotation axis.

8. A flexible and efficient wood chip screening device according to claim 7, characterized in that: The bidirectional conveying auger further comprises a conversion member, wherein the conversion member is arranged between the variable speed motor and the rotating shaft, and the rotating shaft is detachably mounted on the variable speed motor through the conversion member.

9. A flexible and efficient wood chip screening device according to claim 1, characterized in that: The first discharge port of the bidirectional conveying auger is arranged close to the material storage box (1), and the second discharge port of the bidirectional conveying auger is arranged away from the material storage box (1).

10. A flexible and efficient wood chip screening device according to claim 1, characterized in that: The feeder is a star-shaped feeder.

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