Cellulose powder filling dust-free device

Abstract

The invention relates to the technical field of filling machines, in particular to a dust-free cellulose powder filling device which comprises a spiral feeding unit, a weighing unit, a dust removal unit and a clamping and separating mechanism, the weighing unit is located on the upper end face of the clamping and separating mechanism and used for monitoring the mass of materials in a packaging bag in real time and controlling starting and stopping of the spiral feeding unit, and the dust removal unit is located on the lower end face of the clamping and separating mechanism. The dust removal unit is used for recycling residual powder on the top of the packaging bag, and the clamping and separating mechanism is used for hanging the packaging bag and clamping the joint of a feeding port of the packaging bag and a discharging port of the spiral feeding unit. A discharging port of the hopper is communicated with a feeding port of the first spiral feeder, a feeding port of the second spiral feeder is communicated with the first spiral feeder through the storage bin, and discharging ports of the first spiral feeder and the second spiral feeder are both communicated with the packaging bag. The distance and the diameter of spiral bodies in the first spiral feeder are larger than those of the second spiral feeder. The dust-free cellulose powder filling device aims at solving the problems that the feeding speed and precision of cellulose powder are difficult to consider at the same time, and dust pollution is caused.

Description

Technical Field

[0001] This invention relates to the field of filling machine technology, and specifically to a dust-free device for filling cellulose powder. Background Technology

[0002] Industrial cellulose, as an important natural polymer material, is mainly used in construction, papermaking, food, textiles, and oil extraction. Its derivatives, through functional modification, can meet the needs of different industrial scenarios, primarily in the form of cellulose powder for filling and storage. Powder filling machines are automated packaging machines specifically designed for powdery materials, achieving accurate metering and efficient filling through a precision control system. However, traditional powder filling machines still have the following drawbacks when filling cellulose powder: 1. It is difficult to balance feeding speed and accuracy, which can easily lead to overfeeding or underfeeding, requiring manual adjustment and re-weighing. 2. When the packaging bag is detached after filling, dust flies out, polluting the environment and wasting materials.

[0003] Therefore, the inventors have provided a dust-free device for filling cellulose powder. Summary of the Invention

[0004] (1) Technical problems to be solved This invention provides a dust-free filling device for cellulose powder, which solves the technical problems of difficulty in balancing the feeding speed and accuracy of cellulose powder and dust pollution.

[0005] (2) Technical solution This invention provides a dust-free filling device for cellulose powder, comprising a screw feeding unit, a weighing unit, a dust removal unit, and a clamping and releasing mechanism. The weighing unit is located on the upper surface of the clamping and releasing mechanism and is used to monitor the material quality inside the packaging bag in real time and control the start and stop of the screw feeding unit. The dust removal unit is used to recover residual powder at the top of the packaging bag. The clamping and releasing mechanism is used to suspend the packaging bag and clamp the connection between the inlet of the packaging bag and the outlet of the screw feeding unit. The spiral feeding unit includes a hopper, a first spiral feeder, a second spiral feeder, and a storage bin. The outlet of the hopper is connected to the inlet of the first spiral feeder. The inlet of the second spiral feeder is connected to the first spiral feeder through the storage bin. The outlets of both the first and second spiral feeders are connected to the packaging bag. The spacing and diameter of the first spiral bodies in the first spiral feeder are greater than the spacing and diameter of the second spiral bodies in the second spiral feeder.

[0006] Furthermore, the spacing and diameter of the first spiral are 2 to 5 times that of the spacing and diameter of the second spiral.

[0007] Furthermore, the inlet and outlet ends of the storage bin are respectively detached and connected to the corresponding first screw feeder and second screw feeder.

[0008] Furthermore, the bottom outlet of the storage silo is provided with a cover plate. The cover plate includes a first sub-cover plate, a second sub-cover plate, a first support rod, a second support rod, a first drive mechanism, and a second drive mechanism that are connected to each other. The first end of the first sub-cover plate is hinged to the inner wall of the storage silo, the first end of the second sub-cover plate is hinged to the inner wall of the storage silo, and the second end of the first sub-cover plate and the second end of the second sub-cover plate are sealed together. The first support rod is connected to the first sub-cover plate and the first drive mechanism at both ends, and the first sub-cover plate swings under the drive of the first drive mechanism. The second support rod is connected to the second sub-cover plate and the second drive mechanism at both ends, and the second sub-cover plate swings under the drive of the second drive mechanism.

[0009] Furthermore, the storage bin also includes a first angle sensor, a second angle sensor, and a controller. The first angle sensor and the second angle sensor are used to monitor the rotation angle of the first drive mechanism and the second drive mechanism, respectively, and send the acquired first angle information to the controller. The controller is electrically connected to the first drive mechanism and the second drive mechanism and is used to control the synchronous start / stop of the first drive mechanism and the second drive mechanism.

[0010] Furthermore, the storage bin also includes a third angle sensor, which is used to monitor the rotation angle of the second spiral. The controller is electrically connected to the third angle sensor and controls the synchronous start / stop of the first drive mechanism and the second drive mechanism according to the acquired second angle information.

[0011] Furthermore, the second end of the first sub-cover plate and the second end of the second sub-cover plate are respectively provided with a first magnetic attraction part and a second magnetic attraction part that attract each other.

[0012] Furthermore, the clamping and releasing mechanism includes a bracket, a clamp, a hook, and a cylinder. The bracket includes a horizontally placed cross plate and vertical plates connected vertically to both ends of the cross plate. The weighing unit is installed on the upper end face of the cross plate. The clamp is installed on the lower end face of the cross plate and is used to clamp the connection between the inlet of the packaging bag and the outlet of the spiral feeding unit. The hook is installed on the lower end face of the cross plate and is used to suspend the packaging bag. The cylinder is connected to the clamp and is used to provide driving force to the clamp.

[0013] Furthermore, the cellulose powder filling dust-free device also includes a switching valve, which is installed via a flange on the connecting pipeline between the dust removal unit and the filling port of the packaging bag.

[0014] Furthermore, the cellulose powder filling dust-free device also includes a connecting pipe, a first negative pressure suction device, a second negative pressure suction device, and an installation sleeve. The installation sleeve is fitted onto the upper outer wall of the connecting pipe, which is a flexible hose. The first and second negative pressure suction devices are respectively installed on the installation sleeve at positions corresponding to the discharge ports of the first and second screw feeders. The discharge ports of the first and second screw feeders are both connected to the inlet end of the connecting pipe through the mounting sleeve, and the discharge end of the connecting pipe is connected to the packaging bag.

[0015] (3) Beneficial effects In summary, this invention achieves dynamic control of "rapid filling + precise replenishment" through a double spiral feeder (a first spiral feeder and a second spiral feeder with different diameters). The first spiral feeder completes the rapid filling of powder, while the second spiral feeder provides precise replenishment of powder. At the same time, the dust removal unit and the clamping and disengaging mechanism are linked in sequence to completely solve the dust pollution problem. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments of the present invention 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.

[0017] Figure 1 This is a schematic diagram of the structure of a dust-free filling device for cellulose powder provided in an embodiment of the present invention; Figure 2 yes Figure 1 Enlarged view of the structure at point A in the image; Figure 3 This is a schematic diagram of the storage silo of a dust-free filling device for cellulose powder provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of another dust-free filling device for cellulose powder provided in an embodiment of the present invention.

[0018] In the picture: 1-Screw feed unit; 11-Hopper; 12-First screw feeder; 13-Second screw feeder; 14-Storage bin; 1401-First sub-cover plate; 1402-Second sub-cover plate; 1403-First support rod; 1404-Second support rod; 1405-First drive mechanism; 1406-Second drive mechanism; 1407-First angle sensor; 1408-Second angle sensor; 1409-Controller; 1410- 1-Third angle sensor; 2-Weighing unit; 3-Dust removal unit; 4-Clamping and releasing mechanism; 41-Bracket; 42-Clamp; 43-Hook; 44-Cylinder; 45-Moving plate; 5-Switching valve; 6-Connecting pipe; 701-First negative pressure suction device; 702-Second negative pressure suction device; 801-First sealing plate; 802-Second sealing plate; 901-First cylinder; 902-Second cylinder; 10-Installation sleeve; 100-Packaging bag. Detailed Implementation

[0019] The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are used to illustrate the principles of the present invention by way of example, but should not be used to limit the scope of the present invention. That is, the present invention is not limited to the described embodiments, and any modifications, substitutions and improvements to the parts, components and connection methods are covered without departing from the spirit of the present invention.

[0020] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0021] In the description of this invention, it should be understood that the terms "upper," "lower," "front," "rear," 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 of this invention is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of this invention and to simplify the description, and are not intended to 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 this invention.

[0022] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set" and "install" 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 direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0023] Figure 1 This is a schematic diagram of a dust-free filling device for cellulose powder provided in an embodiment of the present invention. See also... Figure 1 The device may include a screw feeding unit 1, a weighing unit 2, a dust removal unit 3, and a clamping and releasing mechanism 4. The weighing unit 2 is located on the upper end face of the clamping and releasing mechanism 4 and is used to monitor the material quality inside the packaging bag 100 in real time and control the start and stop of the screw feeding unit 1. The dust removal unit 3 is used to recover the residual powder at the top of the packaging bag 100. The clamping and releasing mechanism 4 is used to suspend the packaging bag 100 and clamp the connection between the inlet of the packaging bag 100 and the outlet of the screw feeding unit 1. The spiral feeding unit 1 includes a hopper 11, a first spiral feeder 12, a second spiral feeder 13, and a storage bin 14. The discharge port of the hopper 11 is connected to the inlet of the first spiral feeder 12. The inlet of the second spiral feeder 13 is connected to the first spiral feeder 12 through the storage bin 14. The discharge ports of both the first spiral feeder 12 and the second spiral feeder 13 are connected to the packaging bag 100. The spacing and diameter of the first spiral bodies in the first spiral feeder 12 are larger than the spacing and diameter of the second spiral bodies in the second spiral feeder 13.

[0024] In the above embodiment, a first spiral feeder 12 with a large diameter and large spiral pitch is used for rapid material filling; simultaneously, a second spiral feeder 13 with a small diameter and small spiral pitch is used in conjunction with the first spiral feeder 12. When the material approaches the target weight, it switches to a micro-feeding mode to achieve precise material replenishment. Specifically, the spiral spacing and diameter of the first spiral feeder 12 are 200mm, and the spiral spacing and diameter of the second spiral feeder 13 are 100mm. The weighing unit 2 can be a weighing sensor (since the weighing sensor is a conventional sensor, its specific structure and working principle will not be described in detail here) for real-time monitoring of material quality. The start and stop of the first spiral feeder 12 and the second spiral feeder 13 are controlled by a PLC (Programmable Logic Controller); at the same time, the weighing unit 2 can preset a weight threshold and automatically stop feeding when the target value is reached. The dust removal unit 3 is used to automatically start for 5-10 seconds (the time parameter can be stopped and adjusted) after the control system determines that the weighing is completed, and to recover the fine powder remaining at the top of the packaging bag 100 through negative pressure. The pneumatic clamp of the clamping and releasing mechanism 4 uses elastic buckles to clamp the connection between the inlet of the packaging bag 100 and the outlet of the spiral feeding unit 1, thus providing a certain degree of sealing; at the same time, it can also suspend the packaging bag 100.

[0025] In a specific application scenario, the working process of this filling cleanroom device is as follows: 1) Start the system, and the packaging bag 100 is fixed to the filling port by the clamp of the clamping and releasing mechanism 4; 2) The first screw feeder 12 rotates at high speed, quickly filling the material to 98% of the target weight; 3) Switch to the second screw feeder 13 and replenish material at low speed to the target value; 4) Weighing unit 2 triggers dust removal unit 3 to start via a completion signal, which lasts for 10 seconds.

[0026] As an optional implementation, the spacing and diameter of the first spiral are 2 to 5 times that of the second spiral. Specifically, using a first spiral with a large spacing and a large diameter can meet the requirement of rapid filling of material particles by the first spiral feeder 12; using a second spiral with a small spacing and a small diameter can meet the requirement of precise replenishment of material particles by the second spiral feeder 13.

[0027] As an optional implementation, the inlet and outlet ends of the storage hopper 14 are detachably connected to the corresponding first screw feeder 12 and second screw feeder 13, respectively. Specifically, the detachable connection method ensures that the storage hopper 14 can be disassembled and replaced in a timely manner, so that the material particles in the first screw feeder 12 are stored in the storage hopper 14 while entering the packaging bag 100, and the material particles in the storage hopper 14 are transported to the packaging bag 100 by the second screw feeder 13.

[0028] As an optional implementation method, such as Figure 3 As shown, the bottom outlet of the storage silo 14 is equipped with a cover plate. The cover plate includes a first sub-cover plate 1401, a second sub-cover plate 1402, a first support rod 1403, a second support rod 1404, a first drive mechanism 1405, and a second drive mechanism 1406 connected to each other. The first end of the first sub-cover plate 1401 is hinged to the inner wall of the storage silo 14, and the first end of the second sub-cover plate 1402 is hinged to the inner wall of the storage silo 14. The second end of the first sub-cover plate 1401 and the second end of the second sub-cover plate 1402 are sealed together. The two ends of the first support rod 1403 are respectively connected to the first sub-cover plate 1401 and the first drive mechanism 1405, and the first sub-cover plate 1401 swings under the drive of the first drive mechanism 1405. The two ends of the second support rod 1404 are respectively connected to the second sub-cover plate 1402 and the second drive mechanism 1406, and the second sub-cover plate 1402 swings under the drive of the second drive mechanism 1406. Specifically, the first drive mechanism 1405 and the second drive mechanism 1406 can be servo motors. The output shafts of the motors are connected to the first support rod 1403 and the second support rod 1404, and can drive the first support rod 1403 and the second support rod 1404 to rotate. It should be noted that the first support rod 1403 and the second support rod 1404 rotate synchronously but in opposite directions. Figure 3 For example, the first support rod 1403 swings counterclockwise while the second support rod 1404 swings clockwise, thus opening the cover. Similarly, when the first support rod 1403 swings clockwise and the second support rod 1404 swings counterclockwise, the cover is closed.

[0029] As an optional implementation method, such as Figure 3 As shown, the storage bin 14 also includes a first angle sensor 1407, a second angle sensor 1408, and a controller 1409. The first angle sensor 1407 and the second angle sensor 1408 are used to monitor the rotation angles of the first drive mechanism 1405 and the second drive mechanism 1406, respectively, and send the acquired first angle information (generally 30° to 60°) to the controller 1409. The controller 1409 is electrically connected to the first drive mechanism 1405 and the second drive mechanism 1406 and is used to control the synchronous start / stop of the first drive mechanism 1405 and the second drive mechanism 1406. In a specific application scenario, when the first angle sensor 1407 and the second angle sensor 1408 detect that the rotation angle of the first drive mechanism 1405 and the second drive mechanism 1406 is 45°, the controller 1409 will control the synchronous shut-off of the first drive mechanism 1405 and the second drive mechanism 1406, thereby stopping the swing of the first support rod 1403 and the second support rod 1404. The controller 1409 can be a PLC.

[0030] As an optional implementation method, such as Figure 3 As shown, the storage bin 14 also includes a third angle sensor 1410, which is used to monitor the rotation angle of the second spiral. The controller 1409 is electrically connected to the third angle sensor 1410 and controls the synchronous start / stop of the first drive mechanism 1405 and the second drive mechanism 1406 according to the acquired second angle information to realize the opening / closing of the cover.

[0031] In a specific application scenario, when the third angle sensor 1410 detects that the rotation angle of the second spiral is greater than zero (i.e., the second spiral feeder 13 starts feeding), the controller 1409 will control the synchronous start of the first drive mechanism 1405 and the second drive mechanism 1406 (e.g., Figure 3 The motor output shaft swings counterclockwise and clockwise (as shown), thereby opening the cover to complete the unloading of the storage bin 14; when the third angle sensor 1410 detects that the rotation angle of the second spiral is equal to zero (that is, the second spiral feeder 13 stops feeding), the controller 1409 will control the synchronous start of the first drive mechanism 1405 and the second drive mechanism 1406 (e.g., Figure 3 The clockwise and counterclockwise rotation of the motor output shaft (as shown) closes the cover plate.

[0032] Furthermore, the second ends of the first sub-cover plate 1401 and the second sub-cover plate 1402 are respectively provided with a first magnetic attraction part and a second magnetic attraction part that attract each other. The provision of the first magnetic attraction part and the second magnetic attraction part can make the first sub-cover plate 1401 and the second sub-cover plate 1402 more stable in the closed state.

[0033] The first spiral body is spirally distributed along the outer circumferential wall of the first rotation axis, and the second spiral body is spirally distributed along the outer circumferential wall of the second rotation axis. In this embodiment, the cooperation of the first sub-cover plate 1401 and the second sub-cover plate 1402 allows the material particles in the storage bin 14 to be temporarily stored in the storage bin 14 without entering the second spiral feeder 13, thus avoiding blockage of the second spiral feeder 13 and affecting subsequent feeding. Meanwhile, when the second screw feeder 13 starts working, the first support rod 1403 and the second support rod 1404 will swing under the action of the corresponding first drive mechanism 1405 and the second drive mechanism 1406 to generate corresponding thrust on the first sub-cover plate 1401 and the second sub-cover plate 1402, thereby causing the first sub-cover plate 1401 and the second sub-cover plate 1402 to swing, and the sealing state between them will change, which is equivalent to the cover plate being partially or completely opened. The material particles in this storage bin 14 will enter the interior of the second screw feeder 13 through the open gap, and will be transported into the packaging bag 100 to complete the filling of cellulose powder.

[0034] As an optional implementation, the second ends of the first sub-cover plate 1401 and the second sub-cover plate 1402 are respectively provided with a first magnetic attraction part and a second magnetic attraction part (not shown in the figure) that attract each other. Through the magnetic attraction of the first magnetic attraction part and the second magnetic attraction part, the sealing closure between the first sub-cover plate 1401 and the second sub-cover plate 1402 can be achieved, preventing material particles in the storage bin 14 from falling into the second screw feeder 13 and affecting its normal operation.

[0035] As an optional implementation method, such as Figure 1 As shown, the clamping and releasing mechanism 4 includes a bracket 41, a clamp 42, a hook 43, and a cylinder 44. The bracket 41 includes a horizontally placed horizontal plate and vertical plates connected vertically to both ends of the horizontal plate. The weighing unit 2 is installed on the upper end face of the horizontal plate. The clamp 42 is installed on the lower end face of the horizontal plate and is used to clamp the connection between the inlet of the packaging bag 100 and the outlet of the spiral feeding unit 1. The hook 43 is installed on the lower end face of the horizontal plate and is used to suspend the packaging bag 100. The cylinder 44 is connected to the clamp 42 and is used to provide driving force to the clamp 42. Specifically, both the clamp 42 and the cylinder 44 are installed on the lower end face of the horizontal plate. During filling, the clamp 42 is controlled by the cylinder 44 to tighten the inlet of the packaging bag 100 to prevent floating and overflow. More preferably, see Figure 4The clamping and releasing mechanism 4 also includes a movable plate 45. A hook 43 is installed on the lower end face of the movable plate 45. The movable plate 45 is slidably connected to the lower end face of the horizontal plate. After filling and dust collection are completed, the clamp 42 is released from the inlet of the packaging bag 100 by the control of the cylinder 44. Then, the movable plate 45 is pushed (manually or driven by a motor / cylinder) to smoothly move the packaging bag 100 away from the filling port (the outlet of the spiral feeding unit 1), thereby preventing dust from being stirred up. Specifically, a dovetail slide rail is provided on the lower end face of the horizontal plate, and a protrusion adapted to the dovetail rail is provided on the upper end face of the movable plate 45, so that the movable plate 45 can slide along the length direction of the horizontal plate to move closer to / away from the filling port. It should be noted that the filling port can be the direct outlet of the spiral feeding unit 1, or it can be a connecting pipe connected to the spiral feeding unit 1. That is, the inlet of the packaging bag 100 and the outlet of the spiral feeding unit 1 can be directly or indirectly connected.

[0036] As an optional implementation method, such as Figure 1 As shown, the cellulose powder filling dust-free device also includes a switching valve 5, which is connected to the dust removal unit 3 and the filling port of the packaging bag 100 via a flange. The switching valve 5 is automatically interlocked with the weighing unit 2. After weighing is completed and the clamp 42 is released, before the packaging bag 100 falls off, the switching valve 5 automatically opens for 5-10 seconds (the time is adjustable). The fan in the dust removal unit 3 generates negative pressure in the pipeline to recover residual fine powder, preventing the ultrafine dust particles in the packaging bag 100 from overflowing. This achieves dust-free operation, is more environmentally friendly, and thus achieves cleanliness and avoids material waste.

[0037] As an optional implementation method, such as Figure 1 As shown, the dust-free filling device for cellulose powder also includes a connecting pipe 6, a first negative pressure suction device 701, a second negative pressure suction device 702, and an installation sleeve 10. The installation sleeve 10 is fitted onto the outer wall of the connecting pipe 6, which is a flexible hose. The first negative pressure suction device 701 and the second negative pressure suction device 702 are respectively installed on the installation sleeve 10 at positions corresponding to the discharge ports of the first screw feeder 12 and the second screw feeder 13. The discharge ports of the first screw feeder 12 and the second screw feeder 13 are both connected to the inlet end of the connecting pipe 6 through the installation sleeve 10, and the discharge end (filling port) of the connecting pipe 6 is connected to the packaging bag 100. The flexible connection design of the hose avoids interference with weighing. The first negative pressure suction device 701 and the second negative pressure suction device 702 are designed to effectively collect the residual cellulose powder in the corresponding first spiral feeder 12 and second spiral feeder 13. This allows the residual cellulose powder to be more thoroughly attracted to the outlet of the first spiral feeder 12 and the outlet of the second spiral feeder 13 and fall into the connecting pipe 6. This structural design ensures the accuracy of metering while also preventing waste of cellulose powder.

[0038] Specifically, the specific structural forms of the first negative pressure suction device 701 and the second negative pressure suction device 702 are not limited, as long as they can generate negative pressure suction to draw the residual light powder in the corresponding first spiral feeder 12 and second spiral feeder 13 to the outlet and fall into the connecting pipe 6. Preferably, the negative pressure suction device can be a negative pressure fan, and its opening / closing is controlled by a corresponding controller (not shown in the figure). The control logic is as follows: when the fourth angle sensor (not shown in the figure) detects that the rotation angle of the first spiral in the first spiral feeder 12 is zero, the relevant data is transmitted to the controller, and the controller controls the first negative pressure suction device 701 to open and automatically close after running for a set time (generally 5 to 10 seconds); when the third angle sensor 1410 detects that the rotation angle of the second spiral in the second spiral feeder 13 is greater than zero, the relevant data is transmitted to the controller, and the controller controls the second negative pressure suction device 702 to open and automatically close after running for a set time (based on the real-time weight detection data of the weighing unit 2). Meanwhile, in order to prevent the first negative pressure suction device 701 and the second negative pressure suction device 702 from sucking in light powder, the suction force can be adjusted to a smaller value by reducing the rotation speed. Furthermore, corresponding first and second openings can be opened at the lower end of the housing of the first negative pressure suction device 701 and the second negative pressure suction device 702 to allow the light powder attracted into the suction device to fall smoothly into the connecting pipe 6 under the action of gravity.

[0039] As an optional implementation method, such as Figure 2As shown, the dust-free filling device for cellulose powder also includes a first sealing plate 801, a second sealing plate 802, a first cylinder 901, and a second cylinder 902. The first cylinder 901 and the second cylinder 902 are both fixed on the mounting sleeve 10. The piston rods of the first cylinder 901 and the second cylinder 902 pass through the mounting sleeve 10, the connecting pipe 6, and are connected to the corresponding first sealing plate 801 and the second sealing plate 802, and drive the first sealing plate 801 and the second sealing plate 802 to perform linear reciprocating motion along the axial direction. After the first screw feeder 12 and the second screw feeder 13 have finished feeding material in sequence, they will block their respective outlets through the corresponding first sealing plate 801 and the second sealing plate 802 to prevent material from falling and affecting accurate material replenishment. Furthermore, the first negative pressure suction device 701 and the first sealing plate 801 are coaxially arranged and connected to the piston rod of the first cylinder 901. Both can perform linear reciprocating motion under the drive of the first cylinder 901. The second negative pressure suction device 702 and the second sealing plate 802 are coaxially arranged and connected to the piston rod of the second cylinder 902. Both can perform linear reciprocating motion under the drive of the second cylinder 902. The opening / closing of each is controlled by a corresponding controller (not shown in the figure). The control logic is as follows: when the first negative pressure suction device 701 stops (an angle sensor can be set on the negative pressure fan to monitor the change of its rotation angle in real time), the controller controls the first cylinder 901 to open, thereby pushing the first sealing plate 801 to move to the left. Figure 2 (as shown in the direction) thereby blocking the outlet of the first spiral feeder 12; when the monitoring (an angle sensor can be set on the negative pressure fan to monitor the change of its rotation angle in real time) reaches the point where the second negative pressure suction device 702 stops, the controller controls the second cylinder 902 to open, thereby pushing the second sealing plate 802 to move to the left ( Figure 2 (as shown in the direction) thereby blocking the outlet of the second screw feeder 13. The shapes of the first sealing plate 801 and the second sealing plate 802 are adapted to the outlets of the first screw feeder 12 and the second screw feeder 13, and a sealing ring can be provided around the circumference of the first sealing plate 801 and the second sealing plate 802 to further improve their sealing performance.

[0040] It should be noted that the various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. The present invention is not limited to the specific steps and structures described above and shown in the figures. Furthermore, for the sake of brevity, detailed descriptions of known methods and techniques are omitted here.

[0041] The above are merely embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art without departing from the scope of the invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this application should be included within the scope of the claims of this application.

Claims

1. A dust-free device for filling cellulose powder, characterized in that, The system includes a screw feeding unit (1), a weighing unit (2), a dust removal unit (3), and a clamping and releasing mechanism (4). The weighing unit (2) is located on the upper surface of the clamping and releasing mechanism (4) and is used to monitor the material quality inside the packaging bag (100) in real time and control the start and stop of the screw feeding unit (1). The dust removal unit (3) is used to recover the residual powder at the top of the packaging bag (100). The clamping and releasing mechanism (4) is used to suspend the packaging bag (100) and clamp the connection between the inlet of the packaging bag (100) and the outlet of the screw feeding unit (1). The spiral feeding unit (1) includes a hopper (11), a first spiral feeder (12), a second spiral feeder (13), and a storage bin (14). The outlet of the hopper (11) is connected to the inlet of the first spiral feeder (12). The inlet of the second spiral feeder (13) is connected to the first spiral feeder (12) through the storage bin (14). The outlets of the first spiral feeder (12) and the second spiral feeder (13) are both connected to the packaging bag (100). The spacing and diameter of the first spiral body in the first spiral feeder (12) are both greater than the spacing and diameter of the second spiral body in the second spiral feeder (13).

2. The dust-free filling device for cellulose powder according to claim 1, characterized in that, The spacing and diameter of the first spiral are 2 to 5 times that of the spacing and diameter of the second spiral.

3. The dust-free filling device for cellulose powder according to claim 1, characterized in that, The inlet and outlet of the storage bin (14) are respectively detached and connected to the corresponding first screw feeder (12) and second screw feeder (13).

4. The dust-free filling device for cellulose powder according to claim 1 or 3, characterized in that, The bottom outlet of the storage silo (14) is provided with a cover plate. The cover plate includes a first sub-cover plate (1401), a second sub-cover plate (1402), a first support rod (1403), a second support rod (1404), a first drive mechanism (1405), and a second drive mechanism (1406) connected to each other. The first end of the first sub-cover plate (1401) is hinged to the inner wall of the storage silo (14), and the first end of the second sub-cover plate (1402) is hinged to the inner wall of the storage silo (14). The second end of the first sub-cover plate (1401) and the second end of the second sub-cover plate (1402) are sealed together. The first support rod (1403) is connected to the first sub-cover plate (1401) and the first drive mechanism (1405) at both ends respectively, and the first sub-cover plate (1401) swings under the drive of the first drive mechanism (1405). The second support rod (1404) is connected to the second sub-cover plate (1402) and the second drive mechanism (1406) at both ends respectively, and the second sub-cover plate (1402) swings under the drive of the second drive mechanism (1406).

5. The dust-free filling device for cellulose powder according to claim 4, characterized in that, The storage bin (14) further includes a first angle sensor (1407), a second angle sensor (1408), and a controller (1409). The first angle sensor (1407) and the second angle sensor (1408) are used to monitor the rotation angle of the first drive mechanism (1405) and the second drive mechanism (1406), respectively, and send the acquired first angle information to the controller (1409). The controller (1409) is electrically connected to the first drive mechanism (1405) and the second drive mechanism (1406) and is used to control the synchronous start / stop of the first drive mechanism (1405) and the second drive mechanism (1406).

6. The dust-free filling device for cellulose powder according to claim 5, characterized in that, The storage bin (14) also includes a third angle sensor (1410), which is used to monitor the rotation angle of the second spiral. The controller (1409) is electrically connected to the third angle sensor (1410) and controls the synchronous start / stop of the first drive mechanism (1405) and the second drive mechanism (1406) according to the acquired second angle information.

7. The dust-free filling device for cellulose powder according to claim 4, characterized in that, The second end of the first sub-cover plate (1401) and the second end of the second sub-cover plate (1402) are respectively provided with a first magnetic attraction part and a second magnetic attraction part that attract each other.

8. The dust-free filling device for cellulose powder according to claim 1, characterized in that, The clamping release mechanism (4) includes a bracket (41), a clamp (42), a hook (43), and a cylinder (44). The bracket (41) includes a horizontally placed horizontal plate and vertical plates connected vertically to both ends of the horizontal plate. The weighing unit (2) is installed on the upper end of the horizontal plate. The clamp (42) is installed on the lower end of the horizontal plate and is used to clamp the connection between the inlet of the packaging bag (100) and the outlet of the spiral feeding unit (1). The hook (43) is installed on the lower end of the horizontal plate and is used to suspend the packaging bag (100). The cylinder (44) is connected to the clamp (42) and is used to provide driving force to the clamp (42).

9. The dust-free filling device for cellulose powder according to claim 1, characterized in that, It also includes a switching valve (5), which is installed via a flange in the connecting pipeline between the dust removal unit (3) and the filling port of the packaging bag (100).

10. The dust-free filling device for cellulose powder according to claim 1, characterized in that, It also includes a connecting pipe (6), a first negative pressure suction device (701), a second negative pressure suction device (702), and an installation sleeve (10). The installation sleeve (10) is fitted onto the upper outer wall of the connecting pipe (6). The connecting pipe (6) is a flexible hose. The first negative pressure suction device (701) and the second negative pressure suction device (702) are respectively installed on the installation sleeve (10) at positions corresponding to the discharge ports of the first screw feeder (12) and the second screw feeder (13). The discharge port of the first screw feeder (12) and the discharge port of the second screw feeder (13) are both connected to the feed end of the connecting pipe (6) through the mounting sleeve (10), and the discharge end of the connecting pipe (6) is connected to the packaging bag (100).

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