Spiral automatic quantitative powder feeding device

Abstract

The invention discloses a spiral automatic quantitative powder feeding device, and relates to the technical field of powder material conveying and metering, the spiral automatic quantitative powder feeding device comprises a rack, and a storage bin, a spiral feeder and a filling cover mechanism which are mounted on the rack, and further comprises a multi-stage dust removal unit, an air inlet of the multi-stage dust removal unit is communicated with a dust raising point of the filling cover mechanism through a first pipeline; and an inlet of the material returning mechanism is connected with the dust collecting outlet of the multi-stage dust removal unit, an outlet of the material returning mechanism is communicated with the feeding section of the storage bin through a second pipeline, and the material returning mechanism is used for returning the collected dust back to the feeding system. By arranging the multiple stages of dust removal units, the problems that a single dust removal mode is low in efficiency, and tiny dust escapes to cause environmental pollution are solved; and the material returning mechanism is additionally arranged and is communicated with the material storage bin, so that captured dust is completely recycled, and the problem of high loss of raw materials is solved. The two modes are combined to form a dust removal and recovery closed loop, and meanwhile the core benefits of environment cleaning and resource saving are achieved.

Description

Technical Field

[0001] This invention relates to the field of powder material conveying and metering technology, and in particular to an automatic screw-type quantitative powder feeding device. Background Technology

[0002] In industries such as food, pharmaceuticals, and chemicals, the efficient and precise packaging of powdered raw materials into individual packages is a crucial process. This is akin to weighing and packing fine powders, requiring both speed and accuracy. The screw-type automatic quantitative powder feeder is the core equipment for accomplishing this task, utilizing a rotating screw to achieve stable material transport and precise metering.

[0003] Currently, to achieve clean production, such devices are typically equipped with dust removal systems. During the spiral propulsion and descent of powder, a large amount of suspended dust is inevitably generated by compressing and disturbing the air. If this dust is not controlled, it will seriously affect metering accuracy, equipment reliability, and the production environment. Therefore, a typical existing technical solution is to install a cyclone dust collector at the dust-generating point of the feeding device, connected via a pipeline. Its core purpose is to utilize the stable negative pressure generated by the dust collector during operation to actively suck up and capture the suspended dust flow, thereby forming a directional airflow within the equipment cavity that inhibits dust diffusion, maintaining internal air pressure balance, and thus basically meeting the cleanliness requirements of the production site.

[0004] However, the existing structure described above has significant shortcomings. First, a single dust removal method, such as using only a cyclone dust collector, has limited efficiency in capturing extremely fine dust particles, easily leading to environmental pollution in the workshop. Second, and more importantly, the collected dust is usually treated as waste and directly discharged, resulting in the continuous loss of high-value raw materials, which does not meet the requirements of modern production for cost control and resource recycling. Summary of the Invention

[0005] The purpose of this invention is to solve the problems mentioned in the background art, such as incomplete dust collection leading to environmental pollution and the waste of raw materials caused by the discharge of collected dust as waste.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: An automatic screw-feeding powder device includes a frame, a storage hopper, a screw feeder, and a filling hood mechanism mounted on the frame, and further includes: The multi-stage dust removal unit has its air inlet connected to the dust-generating point of the filling hood mechanism through a first pipeline, and is used to classify and purify the dust-laden gas generated during the powder feeding process. The return material mechanism has its inlet connected to the dust collection outlet of the multi-stage dust removal unit, and its outlet connected to the feeding section of the storage silo via a second pipeline, for sending the collected dust back to the feeding system.

[0007] Preferably, the multi-stage dust removal unit includes a primary separator and a secondary fine filter connected in series. A buffer chamber is provided between the primary separator and the secondary fine filter to stabilize the airflow and settle any escaping coarse particles. The primary separator is a cyclone separator. The air inlet of the primary separator is connected to the inside of a screw feeder through a dust discharge interface to centrally send the separated dust to the material system for recycling. The air inlet of the secondary fine filter is connected to the clean gas outlet of the primary separator, and its outlet is connected to an induced draft fan.

[0008] Preferably, the secondary fine filter includes a sealed housing, and at least one filter cartridge for filtering fine dust is provided inside the sealed housing. One side of the sealed housing is provided with an airflow interface that communicates with the clean gas outlet of the primary separator, and the upper part of the other side is provided with an airflow outlet that communicates with the induced draft fan. The bottom is provided with a dust collection hopper, and the outlet of the dust collection hopper is connected to the inlet of the return material mechanism.

[0009] Preferably, the return material mechanism includes a collection hopper, an airlock, and a return material screw conveyor mechanism. The top inlet of the airlock is connected to the bottom outlet of the ash collection hopper, and the bottom outlet of the airlock is connected to the top inlet of the collection hopper. The inlet of the second pipeline is connected to the outlet of the collection hopper, and the outlet of the second pipeline is connected to a recycling interface installed on the side wall of the storage silo. The return material screw conveyor mechanism is installed on the collection hopper and is driven by a servo motor to drive a screw located inside the second pipeline to complete the feeding.

[0010] Preferably, the inlet of the hopper is provided with a detachable permanent magnet grid assembly, which consists of multiple parallel permanent magnet rods for adsorbing and intercepting ferromagnetic impurities in the dust.

[0011] Preferably, one end of the collecting hopper is provided with an integrated guide wall arranged at an angle, the position of which corresponds to the material discharge area, the other end of the collecting hopper is connected to the return screw conveyor mechanism, and the internal discharge channel of the collecting hopper is connected to the inlet of the return screw conveyor mechanism.

[0012] Preferably, the recycling interface is provided with an anti-clogging air cushion.

[0013] Preferably, the filling hood mechanism includes a sealed filling hood at one end of the screw feeder and a quantitative outlet at the other end. The sealed filling hood is provided with a negative pressure dust suction port, which is connected to the inlet of the multi-stage dust removal unit through the first pipeline. The first pipeline is provided with an air volume regulating valve, and the quantitative outlet is provided with a quantitative pushing mechanism to achieve precise quantitative powder feeding.

[0014] Preferably, it also includes a central controller, which is connected to the control system of the screw feeder, the control system of the quantitative pushing mechanism, the return mechanism, and the air volume regulating valve on the first pipeline for coordinating feeding, dust removal and return operations.

[0015] Compared with the prior art, the present invention has the following beneficial effects: This invention, through its multi-stage purification and closed-loop dust recycling dual design, not only solves the dust pollution problem at the production site but also achieves near-zero loss of raw materials, transforming traditional end-of-pipe treatment into internal resource recycling, while improving both environmental and economic benefits, in line with the concept of green manufacturing.

[0016] By employing a series of multi-stage dust removal systems—primary mechanical separation and secondary fine filtration—and stabilizing and buffering the airflow, the system effectively captures dust particles ranging from coarse to submicron sizes. The resulting exhaust gas exhibits high cleanliness, significantly improving the working environment and protecting operator health. A dual-path dust recovery mechanism—with coarse particles directly returned to the material flow and fine dust centrally returned to the storage area—achieves almost complete recovery and reuse of dust emitted during production, significantly reducing waste of high-value raw materials and directly lowering production costs. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

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

[0019] Figure 2 This is a schematic diagram of the rear view structure of the present invention.

[0020] Figure 3 This is a partial schematic diagram of the primary separator of the present invention.

[0021] Figure 4 This is a partial schematic diagram of the secondary fine filter and the return material mechanism of the present invention.

[0022] Figure 5 For the present invention Figure 4 Diagram of the split structure; Figure 6 This is a cross-sectional structural diagram of the present invention.

[0023] Figure 7 This is a schematic cross-sectional view of the secondary fine filter of the present invention.

[0024] Figure 8 This is a partial structural diagram of the recycling interface of the present invention.

[0025] Figure 9 This is a schematic diagram of the return material screw conveyor mechanism of the present invention.

[0026] Drawing Nomenclature: 1. Frame; 2. Storage Bin; 21. Recycling Interface; 211. Anti-clogging Air Cushion; 3. Screw Feeder; 4. Filling Hood Mechanism; 41. Sealed Filling Hood; 42. Quantitative Outlet; 43. Negative Pressure Dust Suction Port; 5. Multi-stage Dust Removal Unit; 51. Primary Separator; 511. Ash Discharge Interface; 52. Secondary Fine Filter; 520. Sealed Housing; 521. Filter Cartridge; 522. Airflow Interface; 523. Airflow Outlet; 524. Ash Collection Hopper; 53. Exhaust Fan; 54. Buffer Chamber; 6. First Pipeline; 61. Airflow Regulating Valve; 7. Return Material Mechanism; 71. Collection Hopper; 711. Permanent Magnet Grille Assembly; 72. Airlock; 73. Return Material Screw Conveying Mechanism; 74. Guide Wall; 8. Second Pipeline. Detailed Implementation

[0027] The present invention will now be described in further detail with reference to the accompanying drawings.

[0028] The following description is intended to disclose the invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious modifications will be apparent to those skilled in the art. The basic principles of the invention defined in the following description can be used in other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the invention.

[0029] Those skilled in the art should understand that, in the disclosure of this invention, the terms "longitudinal," "lateral," "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or position based on the orientation or positional relationship shown in the accompanying drawings. They are merely simplified descriptions for the convenience of describing this invention and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limitations on this invention.

[0030] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.

[0031] Please see Figure 1 - Figure 9An automatic screw-feeding device includes a frame 1, a storage bin 2, a screw feeder 3, and a filling hood mechanism 4 installed on the frame 1. It also includes a multi-stage dust removal unit 5, whose air inlet is connected to the dust emission point of the filling hood mechanism 4 through a first pipeline 6, for classifying and purifying the dust-laden gas generated during the powder feeding process; and a return material mechanism 7, whose inlet is connected to the dust collection outlet of the multi-stage dust removal unit 5, and whose outlet is connected to the feeding section of the storage bin 2 through a second pipeline 8, for sending the collected dust back to the feeding system.

[0032] The automatic screw-type quantitative powder feeding device of this application mainly consists of a frame 1, a storage bin 2, a screw feeder 3, a filling hood mechanism 4, a multi-stage dust removal unit 5, a first pipeline 6, a return material mechanism 7, a second pipeline 8, and a central controller (not shown). The frame 1 provides a stable supporting foundation for the entire device.

[0033] Storage silo 2 is used to store powder raw materials to be packaged, and its bottom outlet is connected to the feed section of screw feeder 3. Screw feeder 3, as the core quantitative conveying component, has a screw with a fixed pitch inside. By precisely controlling the speed and angle of the screw, the quantitative delivery of material volume can be achieved, which is the basis for accurate metering.

[0034] A filling hood mechanism 4 is located at the end of the screw feeder 3, used to receive a fixed amount of material and guide it into the packaging container, while simultaneously sealing off and capturing the dust generated during the process. This mechanism mainly includes a sealed filling hood 41 that seals with the workstation, and a metering outlet 42 located at the other end of the screw feeder 3. A negative pressure dust suction port 43 is provided on the sealed filling hood 41, which is connected to the air inlet of the multi-stage dust removal unit 5 via a first pipe 6. To precisely control the dust removal airflow, an airflow regulating valve 61 is installed on the first pipe 6. In addition, a pneumatic control valve (not shown in the figure), controlled by a central controller, is also provided at the negative pressure dust suction port 43, used to open and close the dust removal airflow during the filling cycle. A metering pushing mechanism, such as a cutting gate or rotary valve driven by a precision stepper motor, is provided at the metering outlet 42 to achieve the final precise release of material, completing the powder feeding.

[0035] The multi-stage dust removal unit 5 is used to deeply purify high-concentration dust-laden gas from the sealed filling hood 41. This unit adopts a two-stage series purification strategy, specifically including a primary separator 51, a secondary fine filter 52, and a buffer chamber 54 connecting the two.

[0036] The primary separator 51 is preferably a high-efficiency cyclone separator. Its air inlet is connected to the negative pressure dust suction port 43 of the filling hood mechanism 4 through the first pipe 6. Its unique design features a dust discharge port 511 at the bottom. This port is not a simple dust discharge port, but is directly connected to the internal conveying channel of the screw feeder 3 through a flange. The dust discharge port is inverted conical in shape. After the dust-laden gas enters the primary separator 51 tangentially, it rotates at high speed. Most of the coarse particles, usually with a particle size of 5 micrometers or larger, are separated under the action of strong centrifugal force. After settling, they are directly sent back to the screw feeder 3 of the main material system through the dust discharge port 511 for recycling, realizing the in-situ and immediate recovery of coarse dust particles.

[0037] After primary separation, the gas exits from the clean gas outlet at the top of the primary separator 51 and enters the buffer chamber 54. The buffer chamber 54 is a cavity with a volume larger than the connecting pipe. The inlet of the buffer chamber 54 is connected to the clean gas outlet at the top of the separator 51, and the outlet is connected to the secondary fine filter 52. Its main function is to stabilize the pulsating airflow from the cyclone separator and allow a small number of coarser particles that escape from the primary separator to have a secondary natural settling opportunity, thereby significantly reducing the load on the subsequent fine filter unit.

[0038] The gas then enters the secondary fine filter 52 for final filtration. For example... Figure 4 , Figure 5 and Figure 7 As shown, the secondary fine filter 52 includes a sealed housing 520, with an airflow interface 522 on one side communicating with the buffer chamber 54. Multiple high-efficiency filter cartridges 521, each coated with a microporous filter membrane, are vertically arranged inside the sealed housing 520. When gas passes through the filter cartridges 521, fine dust particles with a diameter in the sub-micron range are efficiently trapped. The purified clean gas is discharged from the airflow outlet 523 at the upper part of the other side of the sealed housing 520 and is then drawn into the atmosphere by the induced draft fan 53. The fine dust captured by the filter cartridges 521 falls off during backflushing cleaning, such as pulse jet cleaning, and settles in the dust collection hopper 524 at the bottom of the sealed housing 520. The outlet of the dust collection hopper 524 is the dust collection outlet of the secondary fine filter 52.

[0039] The return material mechanism 7 is responsible for handling the fine dust from the ash hopper 524 of the secondary fine filter 52, forming the second path of closed-loop recycling. For example... Figure 4 and Figure 5As shown, this unit mainly includes a collection hopper 71, an airlock 72, and a return material screw conveyor mechanism 73. The top inlet of the airlock 72 is connected to the bottom outlet of the dust collection hopper 524, and the bottom outlet of the airlock 72 is connected to the top inlet of the collection hopper 71. At the inlet of the collection hopper 71, a detachable permanent magnet grid assembly 711 is installed. This assembly consists of multiple parallel-arranged high-strength permanent magnet rods, used to adsorb and intercept ferromagnetic metal impurities that may be mixed in the dust, ensuring the purity of the returned material. The inlet of the second pipeline 8 is connected to the outlet of the collection hopper 71, and the outlet of the second pipeline 8 is connected to the recovery interface 21 installed on the side wall of the storage silo 2. The return material screw conveyor mechanism 73 is installed on the collection hopper 71, and it completes the feeding by driving the screw located inside the second pipeline 8 through a servo motor. The second pipeline 8 is not shown in the figure. Rotating the airlock 72 discharge valve effectively isolates the air pressure inside the dust collection hopper 524 from the external environment while continuously discharging material, preventing damage to the negative pressure of the dust removal system. The recovered fine dust falls through the airlock 72 into the return screw conveyor 73 set on the collection hopper 71, so that the recovered material is transported through the second pipeline 8 to the inside of the recovery interface 21, and finally reaches the storage bin 2 for recycling.

[0040] It should also be noted that one end of the collecting hopper 71 is provided with an integrated guide wall 74 arranged at an angle. The position of the guide wall 74 corresponds to the material discharge area, and the upper end of its angled extension trajectory connects to the material discharge end of the material discharge area, so that the material output from the material discharge area can slide along the angled inner wall surface of the guide wall 74 into the receiving cavity of the collecting hopper 71, avoiding material accumulation at the receiving point. The other end of the collecting hopper 71 is connected to the return screw conveyor mechanism 73, and the internal discharge channel of the collecting hopper 71 is connected to the inlet of the return screw conveyor mechanism 73, so that the material temporarily stored in the collecting hopper 71 can be directly introduced into the return screw conveyor mechanism 73 of the second pipeline 8, completing the material flow connection.

[0041] To prevent powder from bridging and clogging at the interface due to moisture, static electricity, or other reasons, an anti-clogging air cushion 211 is integrated inside the recycling interface 21. This air cushion 211 is controlled by a central controller program (not shown in the figure) and can intermittently spray a small amount of dry compressed air at the interface to locally fluidize the deposited powder, thereby ensuring the long-term unobstructed return path.

[0042] The central controller, such as a PLC (not shown in the figure), is connected to the drive motor of the screw feeder 3, the quantitative pushing mechanism, the airlock 72 of the return mechanism 7, the return screw motor, and the airflow regulating valve 61 on the first pipeline 6. It intelligently coordinates the entire process of feeding, filling, dust removal, and return according to the set formula and rhythm. For example, it can dynamically adjust the opening of the airflow regulating valve 61 according to the filling frequency to achieve on-demand supply of dust removal airflow, thus achieving energy saving. It can also receive signals from the differential pressure sensor on the secondary fine filter 52 (not shown in the figure) and automatically execute the filter cartridge 521 dust removal procedure.

[0043] Working principle During quantitative feeding and filling, the central controller is activated, and the power unit drives the screw of the screw feeder 3 to rotate according to the set parameters, quantitatively pushing the powder in the storage bin 2 to the filling hood mechanism 4. When the material reaches the quantitative outlet 42, the quantitative pushing mechanism is activated, accurately releasing the material into the packaging container below. At the same time, the sealed filling hood 41 opens. Dust generated during the material pushing, falling, and filling process is confined within the sealed filling hood 41. The induced draft fan 53 continues to work, creating a stable negative pressure within the multi-stage dust removal unit 5, the first pipeline 6, and the sealed filling hood 41, drawing the dust-laden gas out from the negative pressure suction port 43.

[0044] The dust-laden gas first enters the primary separator 51, also known as the cyclone separator, where most of the coarse dust particles are centrifugally separated and immediately returned to the material flow of the screw feeder 3 through the ash discharge port 511, achieving immediate recovery in the first path. After being stabilized by the buffer chamber 54, the preliminarily purified gas enters the secondary fine filter 52, where fine dust is efficiently trapped by the filter cartridge 521. The fine dust accumulated in the ash collection hopper 524 of the secondary fine filter 52 is sent to the return material mechanism 7. After airtight unloading by the airlock 72, the permanent magnet grid assembly 711 removes impurities, and the return material is smoothly returned to the storage silo 2 via the second pipeline 8 and the anti-clogging air cushion 211 by the return screw conveyor mechanism 73, achieving centralized recovery in the second path. Thus, almost all the dust generated during the production process is recycled. The central controller monitors the entire process and dynamically adjusts the operating parameters of each component to ensure efficient, energy-saving, and coordinated operation of the system.

[0045] In summary, this invention, through its dual design of multi-stage purification and closed-loop dust recycling, not only completely solves the dust pollution problem in the production environment but also achieves near-zero loss of raw materials, significantly improving both economic and environmental benefits, and aligning with the green, intelligent, and sustainable development direction of modern industry.

[0046] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention. The objectives of the present invention have been fully and effectively achieved. The functions and structural principles of the present invention have been shown and explained in the embodiments, and any modifications or variations of the embodiments of the present invention may be made without departing from the stated principles.

Claims

1. A spiral automatic dosing device, comprising a frame (1), and a storage bin (2), a spiral feeder (3) and a filling cover mechanism (4) installed on the frame (1), characterized in that, Also include: Multi-stage dust removal unit (5), its air inlet through the first pipeline (6) and the dust point of the filling cover mechanism (4) communication, for the dust gas generated in the process of giving powder grading purification; Return material mechanism (7), its inlet and the dust collection outlet of the multi-stage dust removal unit (5) are connected, and its outlet is connected with the feeding section of the storage bin (2) through the second pipeline (8), which is used for sending the collected dust back to the feeding system.

2. A screw type automatic dosing device according to claim 1, characterized in that: The multi-stage dust removal unit (5) comprises a primary separator (51) and a secondary filter (52) connected in series, a buffer cavity (54) is arranged between the primary separator (51) and the secondary filter (52) for stabilizing airflow and settling escaped coarse particles, the primary separator (51) is a cyclone separator, the air inlet of the primary separator (51) is communicated with the inside of the screw feeder (3) through a dust removal interface (511), so that the separated dust is concentrated and sent to the material system for recycling, and the air inlet of the secondary filter (52) is connected with the clean gas outlet of the primary separator (51), and the air outlet is connected with an induced draft fan (53).

3. A screw type automatic dosing device according to claim 2, characterized in that: The secondary filter (52) comprises a sealed box body (520), at least one filter cartridge (521) for filtering fine dust is arranged in the sealed box body (520), one side of the sealed box body (520) is provided with an airflow interface (522) communicated with the clean gas outlet of the primary separator (51), the other side is provided with an airflow outlet (523) communicated with the induced draft fan (53) at the upper portion, and a dust hopper (524) is arranged at the bottom.

4. A screw type automatic dosing device according to claim 2, characterized in that: The return material mechanism (7) comprises a material collecting hopper (71), an air lock (72) and a return spiral conveying mechanism (73), the top inlet of the air lock (72) is connected with the bottom outlet of the dust hopper (524), the bottom outlet of the air lock (72) is connected with the top inlet of the material collecting hopper (71), the inlet of the second pipeline (8) is connected with the outlet of the material collecting hopper (71), the outlet of the second pipeline (8) is connected with a recovery interface (21) mounted on the side wall of the storage bin (2), and the return spiral conveying mechanism (73) is mounted on the material collecting hopper (71) and driven by a servo motor to complete feeding through a screw rod located in the second pipeline (8).

5. A screw type automatic dosing device according to claim 4, characterized in that: A detachable permanent magnetic grid assembly (711) is arranged at the inlet of the material collecting hopper (71), the permanent magnetic grid assembly (711) is composed of a plurality of parallel arranged permanent magnetic rods, and is used for absorbing and intercepting ferromagnetic impurities in the recycled dust.

6. A screw type automatic dosing device according to claim 4, characterized in that: One end of the material collecting hopper (71) is provided with an integrated guide wall (74) arranged obliquely, the position of the guide wall (74) corresponds to a discharging area, the other end of the material collecting hopper (71) is connected with the return spiral conveying mechanism (73), and the internal discharging channel of the material collecting hopper (71) is communicated with the feeding inlet of the return spiral conveying mechanism (73).

7. A screw type automatic dosing device according to claim 4, characterized in that: The recovery interface (21) is internally provided with an anti-blocking air cushion (211).

8. A screw type automatic dosing device according to claim 1, characterized in that: The filling cover mechanism (4) comprises a closed filling cover (41) at one end of the screw feeder (3) and a quantitative outlet (42) at the other end, the closed filling cover (41) is provided with a negative pressure dust suction port (43), the negative pressure dust suction port (43) is connected with the inlet of the multi-stage dust removal unit (5) through the first pipeline (6), the first pipeline (6) is provided with an air volume adjusting valve (61), and the quantitative outlet (42) is provided with a quantitative pushing mechanism to realize accurate quantitative powder feeding.

9. A screw type automatic dosing device according to claim 1, characterized in that: A central controller is further included, which is signal connected with the control system of the screw feeder (3), the control system of the quantitative pushing mechanism, the return material mechanism (7) and the air volume adjusting valve (61) arranged on the first pipeline (6), and is used for coordinating the feeding, dust removal and return material operations.

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