A biomass bunker anti-arching device with multiple augers coupled with a front arching inhibitor

Abstract

The application discloses a biomass silo anti-arching device with multiple augers coupled with pre-arching, and belongs to the technical field of powder storage anti-blocking, which comprises a central auger, a side wall auger and a controller, which are all installed on a vertical storage silo, the helical blades of the central auger are vertically arranged in the vertical storage silo and correspond to the vertical position of a discharge port, multiple side wall augers are uniformly arranged in a circumferential direction with the discharge port as the center, the helical blades of the side wall augers are located in the vertical storage silo, and the axis of the helical blades of the side wall augers is arranged obliquely relative to the axis of the helical blades of the central auger. The central auger and the side wall auger are electrically connected with the controller. The application is different from the traditional passive unblocking mode, a multiple-auger coupled global active arching field is constructed, arching is prevented stably and does not recur, various biomass materials and general low-density powder storage working conditions can be adapted, the dynamic discharge repeated blocking problem is effectively solved, and the continuous operation stability and industrial adaptability of the powder feeding system are significantly improved.

Description

Technical Field

[0001] This invention relates to the field of powder storage anti-blocking technology, and in particular to a biomass silo anti-arching device with multi-auger coupling and pre-positioned arch suppression. Background Technology

[0002] Biomass pellets, powders, and various low-density powder materials generally have inherent physical characteristics such as low density, irregular particle shape, strong interlocking of fibers, unstable packing cohesion, and easy formation of static support on the silo wall. During the continuous unloading process of vertical storage silos, they are prone to spontaneous bridging, arching, and wall adhesion failures, resulting in material discharge interruption, fluctuations in production line conditions, and seriously affecting the continuity and stability of system operation.

[0003] Existing publicly available arch-breaking technologies are all passive fault-response solutions. Their core logic is: upon detecting an arching or blockage fault, they activate vibration, airflow, or agitation equipment to break up the formed arch. These solutions have fundamental technical flaws: First, passive arch breaking inherently lags, inevitably causing short-term material interruptions and operational fluctuations after a fault occurs, making them unsuitable for continuous industrial production. Second, vibration and airflow arch breaking only disturb the surface material, failing to disrupt the rigid stacking structure formed by interlocking biomass fibers, resulting in poor removal of deep arches and a very high recurrence rate. Third, traditional agitation / scraper structures only disturb localized materials; large-scale disturbances cause high resistance, jamming, or damage to the disturbance mechanism, making it difficult to address the persistent arching problem from the arching mechanism's perspective. Fourth, existing technologies do not provide continuous intervention during the unloading dynamic process, only offering post-event remedies, failing to prevent the industry-wide common problem of repeated arching during material unloading.

[0004] Therefore, how to provide a multi-auger coupled pre-mounted anti-arching device for biomass silos that can overcome the above-mentioned problems is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] To achieve the above objectives, the present invention provides a multi-auger coupled pre-embedded arch-suppressing biomass silo anti-arching device, installed on a vertically arranged vertical storage silo. The vertical storage silo has a funnel-shaped bottom, and a discharge port is provided at the small-diameter end of the bottom. The device includes: A central auger is installed on the vertical storage silo, and the spiral blades of the central auger are arranged vertically inside the vertical storage silo, with the spiral blades of the central auger corresponding to the vertical position of the discharge port. A plurality of sidewall augers are provided and installed on the vertical storage silo, and the plurality of sidewall augers are evenly arranged circumferentially around the discharge port; the spiral blades of the sidewall augers are located inside the vertical storage silo, and the axis of the spiral blades of the sidewall augers is inclined relative to the axis of the spiral blades of the central auger; the diameter of the circle defined at the upper end of the spiral blades of the sidewall augers with the axis of the spiral blades of the central auger as the center is larger than the diameter of the circle defined at the lower end of the spiral blades of the sidewall augers; The controller is electrically connected to both the central auger and the side wall augers.

[0006] Preferably, the material conveying direction of the spiral blades of the central auger is arranged vertically upward; the material conveying direction of the spiral blades of the side wall auger is arranged upward along its own axis.

[0007] Preferably, the drive motors of the central auger and the side wall augers are both fixed to the outside of the vertical storage silo and electrically connected to the controller; the spiral blades of the central auger are coaxially fixed with the central shaft, the central shaft is rotatably mounted on the vertical storage silo, and the central shaft is drive-connected to the drive motor of the central auger; the spiral blades of the side wall auger are coaxially fixed with the central shaft, the central shaft is rotatably mounted on the vertical storage silo, and the central shaft is drive-connected to the drive motor of the side wall auger.

[0008] Preferably, the centerline of the second central axis is parallel to the inner wall of the silo bottom; the centerline of the first central axis and the centerline of the second central axis together define a vertical plane.

[0009] Preferably, the rotational speed of the first central shaft is the same as that of the second central shaft, and the rotational speed of the first central shaft is 10 to 30 r / min.

[0010] Preferably, the helix angle of the spiral blades of the central auger is 18° to 30°; the helix angle of the spiral blades of the sidewall auger is 18° to 30°.

[0011] Preferably, the ratio of the pitch of the spiral blade of the central auger to its outer diameter D1 is 0.9 to 1.3; the ratio of the pitch of the spiral blade of the side wall auger to its outer diameter D2 is 0.9 to 1.3; 0.4 ≤ D1 / D0 ≤ 0.7.

[0012] Preferably, the outer diameter of the spiral blade of the sidewall auger is D2; the axis of the spiral blade of a single sidewall auger and the axis of the spiral blade of the central auger together define a vertical reference plane A; the horizontal section B of the hopper bottom coincides with the lower end of the spiral blade of the sidewall auger; along the direction perpendicular to the vertical reference plane A, there is a point E on the inner wall of the hopper bottom that is farthest from the vertical reference plane A, and point E is located on the horizontal section B; the minimum distance between point E and the vertical reference plane A is W, 0.25≤D2 / W≤0.45.

[0013] Preferably, the upper end of the spiral blade of the sidewall auger corresponds to the top of the bin bottom, and the vertical height of the lower end of the spiral blade of the sidewall auger from the discharge port is 1 / 4 to 1 / 3 of the total height of the bin bottom.

[0014] Preferably, a sensor for monitoring the material status is installed at the top of the vertical storage silo, and the sensor is electrically connected to the controller.

[0015] The advantages and positive effects of the multi-auger coupled pre-positioned arch-suppressing biomass silo anti-arching device described in this invention are as follows: 1. Unlike traditional arch-breaking logic: This invention abandons the industry-standard "fault detection-passive arch breaking" delayed mode and adopts a dynamic pre-arch suppression mechanism with synchronous unloading. Through the coupled and coordinated operation of the central auger and the side wall auger, the central auger and the side wall auger can continuously intervene and block the arching conditions during the arching process of the material in the vertical storage bin. This solves the common industry problem of repeated arching and blockage during dynamic unloading from the root, and there is no delay in arch breaking.

[0016] 2. Full-area coupling to suppress arching, with no dead corners in formation: Through the three-dimensional coupling structure of dynamic collapse and diversion of the central auger and upward lifting and unsupporting of the side wall auger, the two arching conditions of interlocking cohesion of material fibers and support of the inner side wall of the silo bottom are continuously destroyed, and the problem of material sticking to the wall is solved simultaneously. The blind spot defects of traditional single mechanism arch breaking are completely eliminated, and the arching is completely prevented and there is no recurrence.

[0017] 3. The parameter system is specifically adapted to biomass materials: The present invention is equipped with a spiral helix angle, a ratio of screw pitch to outer diameter, a dimensionless size ratio of auger and silo body, and a dedicated low-speed rotation range. All of these are designed around the arching characteristics of high-fiber, low-density biomass materials. Unlike general conveying auger equipment, it is not a simple superposition of existing conventional components, and can produce unexpected arch-suppressing technology effects.

[0018] 4. Strong adaptability and wide range of working conditions: It is compatible with the bottom structure of both circular funnel-shaped and polygonal funnel-shaped vertical storage silos, specifically addressing the problem of easy arching of high-fiber, low-density, and irregularly shaped biomass materials. It can also be extended to various lightweight powder storage scenarios, making it highly versatile.

[0019] 5. Adaptive and precise control, energy saving and high efficiency: It has dual modes of full-area synchronous arch suppression and local precise arch suppression. It can adaptively switch working modes according to the accumulation state of materials in the vertical storage silo, avoid ineffective operation, and significantly reduce equipment energy consumption and operation and maintenance costs.

[0020] 6. High degree of automation and continuity, suitable for industrial continuous production: The entire process is automated and synchronized with the unloading process, without the need for manual monitoring or shutdown for unblocking, and can ensure the continuous and stable operation of biomass combustion, pyrolysis, gasification and powder conveying production lines for a long time. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the present invention when the bottom of the silo is in the shape of a circular funnel; Figure 2 This is a partial axonometric sectional view of the bottom of the silo in this invention being in the shape of a circular funnel; Figure 3 This is a schematic diagram of the structure of the present invention when the bottom of the silo is in the shape of a polygonal funnel; Figure 4 This is a partial axonometric sectional view of the bottom of the silo in this invention, which is shaped like a polygonal funnel.

[0022] Figure Labels 1. Vertical storage silo; 2. Discharge port; 3. Spiral blades of the central auger; 4. Spiral blades of the side wall auger; 5. Drive motor of the central auger; 6. Drive motor of the side wall auger; 7. Central shaft one; 8. Central shaft two. Detailed Implementation

[0023] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. These terms are used only for the convenience of describing the invention and for 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 invention. In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0024] In this application, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. In case of any inconsistency, the meaning set forth in this specification or derived from the content described herein shall prevail. Furthermore, the terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit the scope of this application.

[0025] See appendix Figure 1-4 This is a schematic diagram of the overall and partial structure of the present invention. Specifically, the present invention discloses a multi-auger coupled pre-mounted anti-arching device for biomass silos. This device is installed on a vertically arranged storage silo 1. The storage silo 1 has a funnel-shaped bottom, with a discharge port 2 centrally located at the smaller diameter end of the bottom. The device includes: A central auger is installed on a vertical storage silo 1. The spiral blades 3 of the central auger are vertically arranged inside the silo 1, directly above the discharge port 2. The material conveying direction of the spiral blades 3 is vertically upward. The central auger is used to continuously lift and loosen the material in the central area of ​​the vertical storage silo 1 during the unloading process, dynamically breaking the accumulation stress of the material in the central area and maintaining the dynamic collapse and drainage state of the material in the central area.

[0026] Multiple sidewall augers are installed on the vertical storage silo 1, and are evenly arranged circumferentially around the discharge port 2. The spiral blades 4 of the sidewall augers are located inside the vertical storage silo 1, and their axes are inclined relative to the axis of the spiral blades 3 of the central auger. The upper diameter of the spiral blades 4 of the sidewall augers is larger than the lower diameter, with the axis of the central auger's spiral blades 3 as the center. The material conveying direction of the spiral blades 4 of the sidewall augers is upward along their own axis. The sidewall augers are used to lift and raise the material adhering to and accumulated on the inner wall of the silo bottom, breaking the static support structure of the inner wall for the material. Combined with the dynamic collapse of the material in the central area, this promotes the overall balanced and smooth downward flow of material within the vertical storage silo 1, eliminating the risk of material stagnation and adhesion to the inner wall of the silo bottom.

[0027] The controller connects electrically to the central and side-wall augers, controlling their start / stop and material conveying speed. It can independently control the central and side-wall augers, and can individually activate them to dynamically suppress arching based on the material accumulation trend within the vertical storage silo 1, achieving precise intervention in specific zones and reducing ineffective energy consumption. This design abandons traditional fault-triggered start logic, adopting a synchronous start / stop and dynamic disturbance mechanism throughout the unloading process. It intervenes in real-time during dynamic unloading and continuous accumulation of materials, suppressing arching conditions at the source rather than passively breaking up existing arches.

[0028] When the vertical storage silo 1 starts unloading, the central auger and the side wall auger can operate synchronously and continuously, and both stop at the same time after unloading is completed. Before the material forms an arch in the vertical storage silo 1, its accumulation state is continuously intervened, actively blocking the conditions for arch formation, which is different from the existing fault-triggered passive arch-breaking structure. The coupling of the central auger and the side wall auger creates a dynamic arch-suppressing field in the vertical storage silo 1, with dynamic collapse in the center and upward detachment of the side walls. This solves the problems of continuous arching, material sticking to the wall, and poor unloading caused by fiber interlocking and wall support of low-density irregular materials at the mechanism level.

[0029] The drive motor 5 of the central auger and the drive motor 6 of the side wall augers are both fixed to the outside of the vertical storage silo 1 and electrically connected to the controller. The spiral blade 3 of the central auger is coaxially fixed with the central shaft 7, which is rotatably mounted on the vertical storage silo 1 and is drive-connected to the drive motor 5 of the central auger. The spiral blade 4 of the side wall auger is coaxially fixed with the central shaft 8, which is rotatably mounted on the vertical storage silo 1 and is drive-connected to the drive motor 6 of the side wall auger.

[0030] The centerline of central axis 8 is parallel to the inner wall of the bin bottom, the spiral blades 4 of the side wall auger have a gap with the inner wall of the bin bottom, and the centerline of central axis 7 and the centerline of a single central axis 8 can jointly define a vertical plane.

[0031] The rotational speed of central shaft 7 is the same as that of central shaft 8, which is 10–30 r / min. Specifically, when the vertical storage silo 1 contains conventional dry biomass materials, the preferred rotational speed of central shaft 7 is 15–25 r / min; when the vertical storage silo 1 contains highly viscous and moist materials, the rotational speed of central shaft 7 is reduced to 10–18 r / min. This speed range provides a stable shearing and lifting force for the material, avoiding the problems of centrifugal idling and increased material compaction and arching caused by high speeds.

[0032] Both the central auger and the sidewall auger adopt a high-lift upward spiral structure. A high-lift upward spiral structure refers to a spiral blade structure with a large pitch that lifts the material from bottom to top during rotation. In this application, the spiral helix angle of the spiral blade 3 of the central auger is 18°–30°, and the spiral helix angle of the spiral blade 4 of the sidewall auger is 18°–30°. This design is suitable for low-density, irregularly shaped, and highly interwoven materials, and can cut the interlocking structure of fibers between materials, disrupting the material's packing cohesion.

[0033] The pitch-to-outer-diameter ratio of the spiral blades 3 of the central auger is 0.9–1.3; the pitch-to-outer-diameter ratio of the spiral blades 4 of the sidewall auger is also 0.9–1.3. This parameter range effectively severs the interlocking fiber structure of biomass materials, stabilizing the drainage channel in the central collapse.

[0034] The outer diameter of the spiral blade 3 of the central auger is D1, and the inner diameter of the discharge port 2 is D0, with 0.4 ≤ D1 / D0 ≤ 0.7. This ratio balances the central disturbance range and material flow space, preventing the annular arch and fiber entanglement from causing blockage. Throughout the discharge process, the central auger continuously lifts and loosens the material in the central area of ​​the vertical storage silo 1, breaking down the internal stress of the material accumulation and preventing the formation of a rigid central arch.

[0035] The outer diameter of the spiral blades of the sidewall auger is D2. The axis of the spiral blades of a single sidewall auger and the axis of the spiral blades of the central auger together define a vertical reference plane A. The horizontal section B of the silo bottom coincides with the lower end of the spiral blades of the sidewall auger. Along the direction perpendicular to the vertical reference plane A, there is a point E on the inner wall of the silo bottom that is farthest from the vertical reference plane A, and point E is located on the horizontal section B. The minimum distance between point E and the vertical reference plane A is W, 0.25≤D2 / W≤0.45. When the vertical storage silo 1 is large, additional sidewall augers can be added as appropriate to avoid the single sidewall auger becoming too large.

[0036] The upper end of the spiral blade 4 of the sidewall auger corresponds to the top of the silo bottom, and the lower end of the spiral blade 4 of the sidewall auger is 1 / 4 to 1 / 3 of the total height of the silo bottom at the vertical distance from the discharge port 2. The spiral blade 4 of the sidewall auger within this size range can completely cover the arched high-occurrence area of ​​the silo bottom, while reserving a safety gap to avoid interference between the lower end of the spiral blade 4 of the sidewall auger and the spiral blade 3 of the central auger.

[0037] Sensors for monitoring the material status are installed at the top of the vertical storage silo 1. The sensors are electrically connected to the controller. The sensors monitor the material accumulation status inside the vertical storage silo 1 in real time and control the operation of the central auger and the side wall augers.

[0038] The vertical storage silo 1 can be selectively compatible with a high-pressure pulse airflow arch-breaking mechanism and a vibration arch-breaking mechanism. The high-pressure pulse airflow arch-breaking mechanism and the vibration arch-breaking mechanism are only used as backups for extreme working conditions. Under normal unloading conditions, the entire process can be completed without material blockage by relying solely on the dynamic coupling of the central auger and the side wall auger to suppress arching.

[0039] When this multi-auger coupled pre-positioned anti-arching biomass silo anti-arching device is applied: S1. Synchronous Start-Stop Active Arch Suppression: When the vertical storage silo 1 starts unloading, the controller simultaneously starts the central auger and the side wall auger. The central auger and the side wall auger continuously disturb the material in the vertical storage silo 1 at a low speed. The unloading process is uninterrupted. After the unloading is completed, the central auger and the side wall auger stop synchronously.

[0040] S2. Dynamic Arch Formation Interception in the Entire Area: During the unloading process, the central auger continuously disturbs the material in the central area of ​​the vertical storage silo 1, destroying the central accumulation stress of the material and maintaining the central collapse drainage channel; the side wall auger continuously rises and lifts the material near the inner wall of the silo bottom, breaking the static support structure formed by the inner wall of the silo bottom on the material, avoiding the material from sticking to the wall and accumulating and arching locally. In coordination with the central collapse effect, it promotes the overall balanced downward movement of the material in the vertical storage silo 1, inhibiting the arching formation of the material from the root. S3, Zoned Precise Adaptive Control: Sensors monitor the material accumulation status in the vertical storage silo 1 in real time. When a local stagnation trend is detected, the controller can drive the corresponding side wall auger to enhance dynamic disturbance and achieve precise local arch suppression. In addition, under the working conditions of extremely viscous and dense materials, it can also link the high-pressure pulse airflow arch breaking mechanism and the vibration arch breaking mechanism to ensure stable unloading. S4. Cyclic steady-state operation: After the unloading operation is completed, the central auger and the side wall auger stop. The above process is repeated during the next unloading to maintain a continuous and stable unloading state throughout the unloading process of the vertical storage silo 1.

[0041] By dynamically and continuously intervening in the entire unloading process, a dynamic arch suppression field is constructed across the entire domain, characterized by central collapse and sidewall detachment coupling, thereby blocking the formation conditions for bridging and arching from a mechanistic perspective.

[0042] The bottom of the vertical storage silo 1 in this application has two forms: one is a circular funnel shape, and the other is a polygonal funnel shape.

[0043] Example of a silo bottom that is circular and funnel-shaped: In this example, the vertical storage silo 1 has a circular pipe section at the top and a circular funnel-shaped bottom. The inner diameter of the circular pipe section is 960mm, the height is 410mm, the bottom height is 500mm, and the discharge port 2 has a diameter of 150mm. A central auger is coaxially arranged inside the vertical storage silo 1, and side wall augers are evenly distributed at the bottom of the silo.

[0044] The outer diameter of the spiral blade 3 of the central auger is 100mm, the outer diameter of the hollow central shaft 7 is 25mm, and D1 / D0=0.67, satisfying 0.4≤D1 / D0≤0.7; the pitch of the spiral blade 3 of the central auger is 120mm, and the corresponding helix angle is 21°, which is within the preferred range of 18°~30°.

[0045] The total height of the silo bottom is 500mm. The distance between the lower end of the spiral blade 4 of the side wall auger and the discharge port 2 is 140mm. 140 / 500=0.28, which falls within the arrangement range of 1 / 4 to 1 / 3 of the total height of the silo bottom; W=330mm; the outer diameter of the spiral blade 4 of the side wall auger is D2=90mm, and the outer diameter of the hollow central shaft 8 is 20mm. D2 / W≈0.27, which meets the limit range of 0.25≤D2 / W≤0.45.

[0046] In this example, actual testing was conducted using dried wood chips with a length of 10-30 mm and wheat straw with a length of less than 5 mm, both with a moisture content below 5%. Before the test, the gate valve at discharge port 2 was closed, and the vertical storage silo 1 was filled with the test material. At the start of the test, the gate valve at discharge port 2 was opened to discharge the material, and the central auger and side wall auger were simultaneously activated. The operating speed of central shaft 7 and central shaft 8 was controlled at 20 r / min, and the timing was recorded. The material discharge situation in the vertical storage silo 1 was observed. The test showed that when the central auger and side wall auger simultaneously lifted and loosened the material, it effectively disrupted the continuous contraction, compaction, and bridging of the material at the bottom of the silo during descent. This created a dynamic pre-arch suppression mode of central collapse diversion and side wall detachment, blocking the arching conditions at the source and achieving continuous and stable unloading of the material in the vertical storage silo 1. Multiple tests showed that both dried wood chips and wheat straw could be unloaded continuously, stably, and completely, with no material residue in the vertical storage silo 1. The complete unloading of dried wood chips took about 40 seconds, while the complete unloading of wheat straw took about 50 seconds.

[0047] Comparative tests were also conducted on the vertical storage silo 1, with and without the central and side wall augers, and with the central and side wall augers installed but not used during unloading. Observation of the unloading situation revealed that wood chips, compared to straw, have poorer fluidity and are extremely prone to bridging and arching. Multiple vibrations of the vertical storage silo 1 and external force are required to break the arches and ensure complete unloading of the material. While straw has relatively better fluidity, its low density also poses a risk of bridging and arching, requiring appropriate vibration to ensure smooth unloading of all material. Overall, without the solution of this invention, the unloading process is time-consuming and labor-intensive, and arching is unpredictable. However, using the solution of this invention allows for rapid, continuous, stable, and complete unloading of material from the vertical storage silo 1, demonstrating significant advantages.

[0048] Examples of warehouse bottoms that are polygonal funnel-shaped: In this example, the vertical storage silo 1 has a rectangular tube section at the top and a quadrilateral funnel-shaped bottom. The rectangular tube section is 1200mm long, 900mm wide, and 500mm high, the bottom height is 1200mm, and the discharge port 2 is 230mm long and 160mm wide. A central auger is arranged on the central axis of the vertical storage silo 1, and two larger conical surfaces at the bottom of the silo are each equipped with a side wall auger.

[0049] The outer diameter of the spiral blade 3 of the central auger is 100mm, and the outer diameter of the hollow central shaft 7 is 25mm. D1 / D0=0.625, where D0 is calculated based on the smaller width of 160mm, satisfying 0.4≤D1 / D0≤0.7. The pitch of the spiral blade 3 of the central auger is 120mm, corresponding to a helix angle of 21°, which is within the preferred range of 18°~30°.

[0050] The total height of the silo bottom is 1200mm. The distance from the lower end of the spiral blade 4 of the side wall auger to the discharge port 2 is 350mm. 350 / 1200=0.29, which falls within the arrangement range of 1 / 4 to 1 / 3 of the total height of the silo bottom; W=256.5mm; the outer diameter of the spiral blade 4 of the side wall auger is D2=90mm, and the outer diameter of the hollow central shaft 8 is 20mm. D2 / W≈0.35, which meets the limit range of 0.25≤D2 / W≤0.45.

[0051] A practical test was conducted in this example, using the same dried wood chips and wheat straw as in the previous example. During the test, a screw conveyor was connected to the bottom of the vertical storage silo 1. First, the vertical storage silo 1 was filled with the material to be tested. At the start of the test, the central auger and the side wall auger were simultaneously activated, controlling the operating speed of central shaft 7 and central shaft 8 at 20 r / min, and the screw conveyor at the bottom of the vertical storage silo 1 was turned on. A similar continuous and stable material feeding situation as in the previous example was observed, and the discharge rate of the screw conveyor was also continuously stable. Based on the set conveying rate of the screw conveyor, the material in the vertical storage silo 1 could be basically emptied after a period of time. Only a small amount of material residue was found in a localized area at the bottom of the silo due to its special support structure, which did not affect the implementation effect of this application. The comparative test also found that when the central auger and the side wall auger were not installed or were not turned on, both materials had a serious bridging and arching phenomenon in the vertical storage bin 1. The problem was more serious with wood chips, and it was necessary to repeatedly and continuously vibrate the vertical storage bin 1 to completely empty it.

[0052] In addition to the two examples above, for biomass materials with high moisture content and high viscosity, a high-pressure pulse airflow arch-breaking mechanism and a vibration arch-breaking mechanism are used as the core, with the central auger and the side wall auger as the core, to deeply loosen the material. The above is only used as a backup compensation for extreme working conditions.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A multi-auger coupled pre-mounted anti-arching device for biomass silos, installed on a vertically arranged storage silo, wherein the storage silo has a funnel-shaped bottom, and a discharge port is provided at the small-diameter end of the bottom, characterized in that, include: A central auger is installed on the vertical storage silo, and the spiral blades of the central auger are arranged vertically inside the vertical storage silo, with the spiral blades of the central auger corresponding to the vertical position of the discharge port. A plurality of sidewall augers are provided and installed on the vertical storage silo, and the plurality of sidewall augers are evenly arranged circumferentially around the discharge port; the spiral blades of the sidewall augers are located inside the vertical storage silo, and the axis of the spiral blades of the sidewall augers is inclined relative to the axis of the spiral blades of the central auger; the diameter of the circle defined at the upper end of the spiral blades of the sidewall augers with the axis of the spiral blades of the central auger as the center is larger than the diameter of the circle defined at the lower end of the spiral blades of the sidewall augers; The controller is electrically connected to both the central auger and the side wall augers.

2. The biomass silo anti-arching device with multi-auger coupling and pre-positioned arch suppression according to claim 1, characterized in that, The material conveying direction of the spiral blades of the central auger is vertically upward; the material conveying direction of the spiral blades of the side wall auger is arranged upward along its own axis.

3. The biomass silo anti-arching device with multi-auger coupling and pre-positioned arch suppression according to claim 1, characterized in that, The drive motors of the central auger and the side wall augers are both fixed to the outside of the vertical storage silo and electrically connected to the controller; the spiral blades of the central auger are coaxially fixed with the central shaft, the central shaft is rotatably mounted on the vertical storage silo, and the central shaft is driven by the drive motor of the central auger; the spiral blades of the side wall auger are coaxially fixed with the central shaft, the central shaft is rotatably mounted on the vertical storage silo, and the central shaft is driven by the drive motor of the side wall auger.

4. The biomass silo anti-arching device with multi-auger coupling and pre-positioned arch suppression according to claim 3, characterized in that, The centerline of the second central axis is parallel to the inner wall of the silo bottom; the centerline of the first central axis and the centerline of the second central axis together define a vertical plane.

5. The biomass silo anti-arching device with multi-auger coupling and pre-positioned arch suppression according to claim 3, characterized in that, The rotational speed of the first central shaft is the same as that of the second central shaft, and the rotational speed of the first central shaft is 10 to 30 r / min.

6. The biomass silo anti-arching device with multi-auger coupling and pre-positioned arch suppression according to claim 1, characterized in that, The spiral helix angle of the central auger blades is 18° to 30°; the spiral helix angle of the sidewall auger blades is 18° to 30°.

7. The biomass silo anti-arching device with multi-auger coupling and pre-positioned arch suppression according to claim 1, characterized in that, The ratio of the pitch of the spiral blades of the central auger to its outer diameter D1 is 0.9 to 1.3; the ratio of the pitch of the spiral blades of the side wall auger to its outer diameter D2 is 0.9 to 1.3; 0.4 ≤ D1 / D0 ≤ 0.

7.

8. The biomass silo anti-arching device with multi-auger coupling and pre-positioned arch suppression according to claim 1, characterized in that, The outer diameter of the spiral blade of the sidewall auger is D2; the axis of the spiral blade of a single sidewall auger and the axis of the spiral blade of the central auger together define a vertical reference plane A; the horizontal section B of the bin bottom coincides with the lower end of the spiral blade of the sidewall auger; along the direction perpendicular to the vertical reference plane A, there is a point E on the inner wall of the bin bottom that is farthest from the vertical reference plane A, and point E is located on the horizontal section B; the minimum distance between point E and the vertical reference plane A is W, 0.25≤D2 / W≤0.

45.

9. The biomass silo anti-arching device with multi-auger coupling and pre-positioned arch suppression according to claim 1, characterized in that, The upper end of the spiral blade of the sidewall auger corresponds to the top of the bin bottom, and the vertical height of the lower end of the spiral blade of the sidewall auger from the discharge port is 1 / 4 to 1 / 3 of the total height of the bin bottom.

10. A multi-auger coupled pre-positioned arch-suppressing biomass silo anti-arching device according to claim 1, characterized in that, The vertical storage silo is equipped with a sensor at the top for monitoring the material status, and the sensor is electrically connected to the controller.

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