Powder feeding device and powder-liquid mixing device

Abstract

The utility model discloses a powder feeding device and a powder-liquid mixing device, and belongs to the field of carbon fiber production, the powder feeding device comprises a first stock bin, a first valve and a first blanking assembly, the bottom of the first stock bin is provided with a first discharge port, the first valve is installed at the first discharge port, and the first valve is installed at the first discharge port. The first discharging assembly comprises a vibration device and a mounting structure, the mounting structure is welded or bonded to the outer wall of the first stock bin, the vibration device is detachably connected to the mounting structure, and powder is promoted to be smoothly discharged from the first stock bin through vibration force provided by the vibration device. The installation structure can be installed on the first stock bin through a welding or bonding means on the premise that the sealing performance of the first stock bin is not damaged.

Description

Technical Field

[0001] This utility model belongs to the field of carbon fiber production, specifically, it relates to a powder feeding device and a powder-liquid mixing device. Background Technology

[0002] Polyacrylonitrile (PAN)-based carbon fibers are widely used due to their high strength, high modulus, low density, high temperature resistance, friction resistance, good electrical conductivity, good thermal conductivity, and exceptional chemical corrosion resistance. One method for preparing PAN precursor fibers is a two-step process. First, PAN polymer powder is obtained through heterogeneous precipitation polymerization. Then, a suitable solvent is used to mix the powder in a certain proportion to dissolve the powder and prepare a spinning solution.

[0003] Chinese patent CN114606579A discloses an ammoniaation device for polyacrylonitrile spinning solution. The device includes several storage tanks arranged in layers from top to bottom according to gravity. The ammonia storage tank and the solvent storage tank are located on the top layer and connected to the mixed liquid storage tank located in the middle layer through a loss-in-weight weighing system. The mixed liquid storage tank and the polyacrylonitrile powder storage tank located in the middle layer are connected to the slurry tank located at the bottom layer through a loss-in-weight weighing system. The slurry tank is sequentially connected to the tubular heat exchanger and the degassing tank located at the bottom layer.

[0004] When the powder accumulates to an excessive thickness in the storage tank, the powder particles are tightly packed together, which significantly reduces the flowability of the powder in the storage tank. This can easily lead to problems where the powder cannot be smoothly discharged from the storage tank into the loss-in-weight weighing system. Utility Model Content

[0005] To address the problem of powder materials failing to be smoothly discharged from the storage tank into the loss-in-weight weighing system, this utility model provides a powder material dispensing device: including a first silo, a first valve, and a first dispensing assembly. The first silo has a first discharge port at its bottom, and the first valve is installed at the first discharge port. The first dispensing assembly includes a vibration device and an installation structure. The installation structure is welded or bonded to the outer wall of the first silo, and the vibration device is detachably connected to the installation structure.

[0006] The present invention is further configured such that: the installation structure includes a fixedly connected installation part and a connecting part; the connecting part matches the outer wall of the first silo, and the two are welded or bonded together at the shape matching point; the vibration device is detachably connected to the installation part.

[0007] The present invention is further configured such that: the mounting structure is provided with a mounting part and a plurality of connecting parts, the mounting part and the connecting parts are both plate-shaped structures, and all connecting parts are perpendicular to the mounting part.

[0008] The present invention is further configured to include a connecting structure for detachably connecting the vibration device to the mounting structure.

[0009] The present invention is further configured such that: the first feeding assembly further includes a first air duct and a second valve, the first air duct is inserted into the first hopper and is used to blow gas to the first discharge port; the second valve is installed at the air inlet end of the first air duct.

[0010] The present invention is further configured to include a material level detection device, which is installed on the first silo.

[0011] The present invention is further configured to include a second hopper, a third valve, and a second feeding assembly. The second hopper has a second feeding port at its bottom and a first feeding port at its top. The third valve is installed between the second feeding port and the first feeding port. The second feeding assembly is used to accelerate the feeding speed at the third valve by at least one of vibration and air supply.

[0012] The present invention is further configured such that: the first valve is a rotary valve, or the outlet of the first valve is connected to the rotary valve.

[0013] This utility model also provides a powder-liquid mixing device, which includes the above-mentioned powder feeding device and mixing device; the first discharge port of the powder feeding device is connected to the mixing device, and the mixing device is provided with a liquid feeding port.

[0014] The present invention is further configured to include a regulating valve, which is installed at the liquid inlet.

[0015] After adopting the above technical solution, this utility model has the following beneficial effects compared with the prior art: This utility model provides a powder feeding device and a powder-liquid mixing device, which promotes the smooth discharge of powder from the first silo through the vibration force provided by the vibration device. The mounting structure for installing the vibration device in this utility model can be installed on the first silo without damaging its sealing performance by welding or bonding. Furthermore, the mounting structure in this utility model matches the shape of the first silo, and its simple structure and light weight help improve the reliability of the connection between the mounting structure and the first silo. In addition, this utility model also includes a first air duct, which further promotes the smooth discharge of powder by blowing gas. This utility model is applicable to the two-step preparation of carbon fiber, as well as other related fields involving powder conveying and powder-liquid mixing.

[0016] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings. Attached Figure Description

[0017] The accompanying drawings, as part of this utility model, are used to provide a further understanding of the present utility model. The illustrative embodiments and descriptions of the present utility model are used to explain the present utility model, but do not constitute an undue limitation of the present utility model. Obviously, the drawings described below are merely some embodiments; those skilled in the art can obtain other drawings based on these drawings without creative effort. In the drawings:

[0018] Figure 1 To illustrate the structural diagram of the first silo;

[0019] Figure 2 for Figure 1 Enlarged view of region A in the middle;

[0020] Figure 3 To illustrate the structure of the second silo;

[0021] Figure 4 This is a simplified structural diagram of a powder-liquid mixing device (where the first and second silos are...). Figure 1 , 3 (As shown).

[0022] In the diagram: 1. First silo; 2. First air duct; 3. Vibration device; 4. Installation structure; 41. Installation part; 42. Connection part; 5. Second valve; 6. First valve; 7. Connecting pipe; 8. Fourth valve; 9. Mixing device; 10. Loss-in-weight weighing system; 11. Feeding device; 12. Second silo; 13. Third valve; 14. First vent pipe; 15. Second vent pipe; 16. Regulating valve; 17. Bolt; 18. Nut; 19. Second air duct; 191. Air outlet; 20. Fifth valve.

[0023] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the present invention in any way, but rather to illustrate the concept of the present invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0025] In the description of this utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and 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 this utility model.

[0026] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0027] Example

[0028] like Figure 1-4 As shown in the preferred embodiment of this utility model, this embodiment provides a powder dispensing device, which includes a first hopper 1, a first valve 6, and a first feeding assembly. The first hopper 1 is used to store powder, and a first inlet for dispensing powder is provided at the top of the first hopper 1 (not shown in the figure). The inner bottom surface of the first hopper 1 is a downwardly convex arc surface or an inverted cone surface, and a first outlet is provided at the lowest point of the inner bottom surface. The first valve 6 is installed at the first outlet to control the flow and stop of powder at the first outlet. When the first valve 6 is open, the powder in the first hopper 1 will flow towards the first outlet under the guidance of the inner bottom surface of the first hopper 1. The first feeding assembly includes a vibration device 3 and a mounting structure 4. The mounting structure 4 is welded or bonded to the outer wall of the first hopper 1 to prevent the installation of the mounting structure 4 on the first hopper 1 from damaging the sealing of the first hopper 1. The vibration device 3 is detachably connected to the mounting structure 4 for maintenance. When the first valve 6 is opened, the vibration device 3 is activated to vibrate the first hopper 1, which can accelerate the falling speed of the powder in the first hopper 1.

[0029] Specifically, the vibration device 3 includes, but is not limited to, an eccentric wheel vibrator, a pneumatic vibrator, and a hydraulic vibrator.

[0030] Specifically, the first valve 6 is a manual valve or an electrically controlled valve, and the vibration device 3 is switched on and off manually or electrically. The opening and closing of the first valve 6 and the vibration device 3 are controlled manually or by a program.

[0031] In this embodiment, the first valve 6 and the vibration device 3 open and close together.

[0032] Specifically, the mounting structure 4 is installed at the bottom of the first hopper 1.

[0033] In this embodiment, multiple vibration devices 3 are provided, and all vibration devices 3 are distributed around the discharge port. Ideally, all vibration devices 3 should be evenly distributed around the discharge port.

[0034] Specifically, the sidewall of the first hopper 1 is preferably cylindrical, and the inner bottom surface of the first hopper 1 is preferably inverted conical. In this embodiment, the sidewall of the first hopper 1 is cylindrical, and the inner bottom surface of the first hopper 1 is inverted conical.

[0035] In this embodiment, the vibration device 3 corresponds one-to-one with the mounting structure 4, and all vibration devices 3 are detachably connected to their corresponding mounting structures 4. The detachable connection between the vibration device 3 and the mounting structure 4 includes, but is not limited to, connection and snap-fit ​​through additional connection structures.

[0036] Specifically, the mounting structure 4 includes a mounting part 41 and a connecting part 42 that are fixedly connected; the connecting part 42 matches the outer wall of the first hopper 1, and the two are welded or bonded at the shape matching point to improve the connection strength between them. The vibration device 3 is detachably connected to the mounting part 41.

[0037] Specifically, the mounting structure 4 is provided with a mounting part 41 and multiple connecting parts 42. Both the mounting part 41 and the connecting parts 42 are plate-shaped structures. All connecting parts 42 are perpendicular to and fixed to the mounting part 41. The side of all connecting parts 42 away from the mounting part 41 matches the shape of the outer wall of the first hopper 1 and is welded or bonded together. All connecting parts 42 are not coplanar.

[0038] Specifically, the surface of the connecting part 42 that matches the outer wall of the first hopper 1 is an arc surface, so as to increase the connection area between the connecting part 42 and the outer wall of the first hopper 1 and improve the connection strength between the two. At the same time, the vibration force transmitted by the vibration device 3 to the first hopper 1 through the connecting part 42 will also be concentrated towards the axis of the first hopper 1 under the guidance of the mating surface of the connecting part 42 and the first hopper 1, promoting the flow of powder towards the first discharge port.

[0039] Specifically, the mounting structure 4 is provided with two connecting parts 42, which are parallel to each other.

[0040] Specifically, the mounting structure 4 is an integrally molded structure to improve its structural strength.

[0041] The mounting structure 4 described in this embodiment is made by bending a long strip of plate, and each end of the mounting part 41 is bent into a connecting part 42.

[0042] Specifically, this embodiment includes a connection structure for mounting the vibration device 3 onto the mounting structure 4. The connection principle of the connection structure includes, but is not limited to, snap-fit ​​and threaded connection. In this embodiment, the connection structure includes bolts 17 and nuts 18. Each vibration device 3 is mounted on the mounting portion 41 of the mounting structure 4 via multiple connection structures. In this embodiment, one connection structure is provided on each side of each vibration device 3.

[0043] In this embodiment, the connecting part 42 is welded to the outer side of the first hopper 1. All bolts 17 pass through the mounting part 41 and the vibration device 3 from the side of the mounting part 41 near the connecting part 42, and are threadedly connected to the corresponding nuts 18. The nuts 18 are located on the side of the vibration device 3 away from the mounting structure 4, and are not obstructed by the mounting structure 4, which facilitates the tightening of the nuts 18 with tools such as wrenches.

[0044] Specifically, the first feeding assembly also includes a first air duct 2 and a second valve 5. The first air duct 2 is inserted into the first hopper 1 and is used to blow gas to the first discharge port. The second valve 5 is installed at the air inlet of the first air duct 2 to control the flow and stop of gas in the first air duct 2. When the first valve 6 is opened, the second valve 5 is opened, and the external air supply device blows gas to the first discharge port through the first air duct 2, further accelerating the falling speed of the powder at the first valve 6.

[0045] Specifically, the second valve 5 is a manual valve or an electrically controlled valve. The second valve 5 is controlled manually or by a program. In this embodiment, the first valve 6 and the second valve 5 open and close together.

[0046] The first air duct 2 is inserted into the first hopper 1 from the top. When the first hopper 1 contains a large amount of powder, the bottom end of the first air duct 2 is submerged in the powder. The connection between the first hopper 1 and the first air duct 2 is a detachable connection or a fixed connection. The connection methods between the first hopper 1 and the first air duct 2 include, but are not limited to, bonding, plugging, and connector connection.

[0047] In this embodiment, the bottom end of the first air duct 2 is lower than the highest point of the inner bottom surface and higher than the discharge port. Ideally, the bottom end of the first air duct 2 should be located directly above the discharge port.

[0048] Specifically, the powder dispensing device further includes a rigid connecting pipe 7. The first hopper 1 is provided with an installation hole for inserting the first air duct 2. The connecting pipe 7 is connected to the installation hole, and the first air duct 2 passes through the connecting pipe 7 and the installation hole and is inserted into the first hopper 1. The first air duct 2 is fixedly connected to the connecting pipe 7 to increase the connection strength between the first air duct 2 and the first hopper 1.

[0049] The connection between the connecting pipe 7 and the first silo 1 can be detachable or fixed. The connection method between the connecting pipe 7 and the first silo 1 includes, but is not limited to, welding or threaded connection. In this embodiment, the connection between the connecting pipe 7 and the first silo 1 is welding, so as to reduce the damage to the wall of the first silo 1 caused by the installation of the connecting pipe 7 and protect the structural strength of the wall of the first silo 1.

[0050] The connection between the first air duct 2 and the connecting pipe 7 is a detachable connection or a fixed connection. The connection between the first air duct 2 and the connecting pipe 7 includes, but is not limited to, gluing, snap-fitting, and connector connection.

[0051] Specifically, the first air duct 2 is sealed to the first hopper 1 to prevent a sudden increase in pressure inside the first hopper 1 when powder enters, which could cause air carrying powder to scatter outside the hopper 1 through the gap between the first air duct 2 and the first hopper 1, polluting the environment. In this embodiment, the first air duct 2 and the connecting pipe 7 are fixed together by wrapping with tape. The gap between the end of the connecting pipe 7 away from the first hopper 1 and the first air duct 2 is sealed with tape to reduce the possibility of air carrying powder escaping from the first hopper 1. The tape is also easy to remove, facilitating the replacement of the first air duct 2. The tape is not shown in the diagram.

[0052] Specifically, the first duct 2 is used to supply inert gas into the first silo 1. The inert gas is one that does not readily undergo oxidation-reduction reactions with the powder within the first silo 1, thereby reducing the impact of the gas supplied by the first duct 2 on the chemical properties of the powder. The inert gas includes, but is not limited to, nitrogen, argon, and helium. In this embodiment, the gas supplied by the external air supply device to the first duct 2 is nitrogen, which is relatively inexpensive.

[0053] In this embodiment, the vibration device 3 is a pneumatic vibrator. Its working principle involves introducing high-pressure gas through an air pipe into the inlet of the pneumatic vibrator. When the gas pushes the piston upwards inside the vibrator, the gas in the chamber on the piston is compressed, and the compressed gas is discharged through the exhaust port. When the piston reaches its endpoint, the gas flow direction is automatically switched through the slot and air passage, allowing gas to enter the chamber on the piston. The high-pressure gas pushes the piston downwards to the endpoint, ending the first cycle and starting the second cycle. This continuous reciprocating cycle causes the pneumatic vibrator to produce translational and oscillating motions, thereby generating vibration force.

[0054] The pneumatic vibrator contains no electric motor or complex mechanical parts, resulting in a lower failure rate, lower maintenance costs, a relatively longer service life and maintenance cycle, and lower noise. Furthermore, the pneumatic vibrator is lightweight, easy to install, and unlikely to affect the structural strength of the first hopper 1.

[0055] Specifically, this embodiment also includes a fourth valve 8, through which the air supply device for the pneumatic vibrator is connected to the air inlet of the pneumatic vibrator. The fourth valve 8 is used to control the gas flow rate entering the pneumatic vibrator. All pneumatic vibrators can share one fourth valve 8, or each pneumatic vibrator can be connected to the air supply device through its own fourth valve 8. In this embodiment, each pneumatic vibrator is connected to the air supply device through its own fourth valve 8. The fourth valve 8 can be a manual valve or an electrically controlled valve. The vibration frequency of the pneumatic vibrator can be adjusted by changing the opening degree of the fourth valve 8; a smaller opening degree results in a slower vibration frequency, while a larger opening degree results in a faster vibration frequency.

[0056] In this embodiment, the second valve 5, the first valve 6, and the fourth valve 8 are all electrically controlled valves, allowing operators to remotely control their opening and closing, as well as their degree of opening. In this embodiment, the second valve 5, the first valve 6, and all fourth valves 8 are connected to a control system, enabling operators to remotely control their opening, closing, and degree of opening through the control system. The opening degrees of all fourth valves 8 may be the same or different; in this embodiment, all fourth valves 8 open and close simultaneously, and all fourth valves 8 have the same opening degree. In this embodiment, the control system's control of the second valve 5, the first valve 6, and all fourth valves 8 is implemented by a program within the control system.

[0057] In this embodiment, the vertical height of the bottom end of the first air duct 2 from the first valve 6 is adjusted according to the powder flow rate at the first valve 6, ultimately maximizing the powder flow rate at the first valve 6. Specifically, in this embodiment, under the conditions of equal outlet opening and the vibration device 3 being closed, experiments were conducted with the vertical height of the bottom end of the first air duct 2 from the first valve 6 being 200mm, 300mm, and 400mm respectively. By observing the powder flow rate at the first valve 6, it was found that the powder flow rate at the first valve 6 was maximum when the vertical height of the bottom end of the first air duct 2 from the first valve 6 was 300mm. Based on this, the first air duct 2 was fixed so that the vertical height of the bottom end of the first air duct 2 from the first valve 6 was 300mm.

[0058] Specifically, in this embodiment, the first duct 2 is a flexible pipe with a certain degree of elasticity, which facilitates the above-mentioned experiment and allows for adjustment of the vertical height of the bottom end of the first duct 2 from the first valve 6. Simultaneously, the flexible first duct 2 can better adapt to changes in its internal airflow, reducing the pressure on the external air supply device.

[0059] The powder dispensing device further includes a second hopper 12, a third valve 13, and a second feeding assembly. A second feeding port is provided at the bottom of the second hopper 12. The third valve 13 is installed between the second feeding port and the first inlet to control the flow and cessation of powder from the second hopper 12 into the first hopper 1. The third valve 13 is a manual valve or an electrically controlled valve. The second feeding assembly is used to accelerate the feeding speed at the third valve 13 by at least one of vibration and air supply. The second hopper 12 is used to store powder. In this embodiment, the inner bottom surface of the second hopper 12 is a downwardly concave arc surface or an inverted cone shape. The second discharge port is located at the lowest point of the inner bottom surface of the second hopper 12.

[0060] Specifically, the side walls of the second hopper 12 are cylindrical, and the bottom wall of the second hopper 12 is inverted conical.

[0061] In this embodiment, the side wall of the second hopper 12 is cylindrical, and the bottom wall of the second hopper 12 is inverted conical.

[0062] In this embodiment, the third valve 13 is a butterfly valve, which has a fast opening and closing speed.

[0063] In this embodiment, the third valve 13 is an electrically controlled valve, which is connected to the control system. The opening and closing of the third valve 13 is controlled by the control system.

[0064] Specifically, the structure of the second feeding assembly may be partially or entirely the same as that of the first feeding assembly. In this embodiment, the second feeding assembly includes a second air duct 19 and a fifth valve 20. The second air duct 19 is inserted into the second hopper 12 and is used to blow gas to the second discharge port; the fifth valve 20 is installed at the air inlet end of the second air duct 19. In this embodiment, when the third valve 13 is open, the fifth valve 20 opens intermittently to form an impact airflow, accelerating the flow of powder in the second hopper 12 towards the second discharge port. The fifth valve 20 is a manual valve or an electrically controlled valve. In this embodiment, the fifth valve 20 is an electrically controlled valve, and its opening and closing are controlled by the control system through a program. In this embodiment, when the third valve 13 is open, the fifth valve 20 opens and closes intermittently.

[0065] Specifically, the second duct 19 is used to supply inert gas into the second silo 12. The inert gas is one that does not readily undergo oxidation-reduction reactions with the powder within the second silo 12, thereby reducing the impact of the gas supplied by the second duct 19 on the chemical properties of the powder. The inert gas includes, but is not limited to, nitrogen, argon, and helium. In this embodiment, the gas supplied to the second duct 19 by the external air supply device is nitrogen, which is relatively inexpensive.

[0066] In this embodiment, the air outlet of the second air duct 19 is located in the inverted conical part of the second silo 12.

[0067] Specifically, the second air duct 19 has multiple air outlets 191, and all air outlets 191 are distributed around the axis of the second silo 12.

[0068] In this embodiment, a material level detection device is installed on the first silo 1. This device detects the powder level within the silo 1 and is connected to a control system. The control system has a maximum and a minimum material level. When the material level detection device detects that the powder level in the first silo 1 is lower than the minimum level, it opens the third valve 13. The third valve 13 closes when the material level detection device detects that the powder level in the first silo 1 has reached the maximum level. The detection principle of the material level detection device includes, but is not limited to, ultrasonic ranging, radar ranging, laser ranging, and photoelectric sensors. The photoelectric sensor works by installing one at each of the maximum and minimum material levels in the first silo 1. The powder level blocks the light signal of the corresponding photoelectric sensor, indicating that the powder level has reached the height of that sensor. The material level detection device is not shown in the figure.

[0069] The powder dispensing device also includes a loss-in-weight weighing system 10. The first valve 6 is connected to the top of the loss-in-weight weighing system 10. A weighing sensor is installed inside the loss-in-weight weighing system 10 to detect the weight of the powder inside. A feeding device 11 is installed at the bottom of the loss-in-weight weighing system 10. The feeding device 11 is used to quantitatively discharge the powder from the loss-in-weight weighing system 10 through mechanical movements such as vibration, rotation, spiral blade pushing, and belt conveying. When the weight of the powder detected by the weighing sensor reaches the set amount of powder, the feeding device 11 is activated. The feeding device 11 can be manually controlled or electrically controlled.

[0070] In this embodiment, the opening and closing of the feeding device 11 is controlled by an electrical signal from the control system. The weighing sensor and the feeding device 11 are connected to the control system. The powder set amount is entered into the control system. The control system compares the powder weight detected by the weighing sensor with the powder set amount in real time to control the opening and closing of the feeding device 11.

[0071] The commonly used feeding device 11 uses spiral blades to push the powder. However, the powder has excessive fluidity, which can easily lead to slippage and cause large fluctuations in the powder flow rate delivered by the feeding device 11, making it difficult to deliver the powder to the mixing device 9 at a uniform speed. In this embodiment, the feeding device 11 is a rotary valve, also known as a centrifugal metering pump, which delivers a uniform and stable powder flow rate. The rotation speed of the rotor in the rotary valve is determined by the control system based on the powder set amount and the flow rate of the rotary valve, so as to accurately control the amount of powder delivered by the rotary valve to the mixing device 9 equal to the powder set amount.

[0072] Specifically, the first valve 6 is a rotary valve, or the outlet of the first valve 6 is connected to a rotary valve. In this embodiment, the first valve 6 is a butterfly valve, which has a fast opening and closing speed. The first valve 6 is connected to the rotary valve.

[0073] The powder dispensing device also includes first vent pipes 14. The top of the first silo 1 and the top of the loss-in-weight weighing system 10 are respectively connected to the bottom ends of the two first vent pipes 14. The axes of the two first vent pipes 14 are vertical or inclined. The first vent pipes 14 are used to discharge gas from the first silo 1 or the loss-in-weight weighing system 10. When powder enters the first silo 1 and the loss-in-weight weighing system 10, the gas carrying the powder will be squeezed into the first vent pipes 14 due to the increased internal pressure, so as to prevent the pressure in the first silo 1 or the loss-in-weight weighing system 10 from becoming too high. If the gas flow rate in the first vent pipe 14 gradually decreases to zero, the powder carried by the gas will fall back into the first silo 1 and the loss-in-weight weighing system 10 along the first vent pipe 14 under its own gravity.

[0074] In this embodiment, the axes of the two first vent pipes 14 are inclined. The powder feeding device in this embodiment also includes a second vent pipe 15, the axis of which is vertical or tends to be vertical. The top ends of both first vent pipes 14 are connected to the second vent pipe 15; the top end of the first vent pipe 14 connected to the top of the loss-in-weight weighing system 10 is connected to the bottom end of the second vent pipe 15. When powder enters the first hopper 1 and the loss-in-weight weighing system 10, the gas carrying the powder sequentially enters the first vent pipe 14 and the second vent pipe 15. The gas in the second vent pipe 15 is discharged to the high altitude from the top end of the second vent pipe 15. The gas velocity of the gas carrying the powder in the second vent pipe 15 gradually decreases to zero, so that the powder carried by the gas can fall back to the first hopper 1 and the loss-in-weight weighing system 10 along the second vent pipe 15 and the first vent pipe 14 under its own gravity, reducing the possibility of the powder being discharged from the top end of the second vent pipe 15.

[0075] like Figure 4 As shown, this utility model also provides a powder-liquid mixing device, which includes the aforementioned powder feeding device and a mixing device 9. A rotary valve in the powder feeding device is connected to the mixing device 9, and the mixing device 9 is provided with a liquid inlet. The mixing device 9 is used to mix the powder from the first hopper 1 and the liquid from the liquid inlet. The mixing principle of the mixing device 9 includes, but is not limited to, stirring, vibration mixing, and shaking. The internal structure of the mixing device 9 is omitted in the figure.

[0076] The powder-liquid mixing device further includes a regulating valve 16, which is installed at the liquid inlet. The regulating valve 16 controls the entry or stop of liquid raw materials into the mixing device 9. Compared with a gear pump delivering liquid raw materials into the mixing device 9, the regulating valve 16 has lower noise and more stable flow. The regulating valve 16 can be an electrically controlled valve or a manual valve. In this embodiment, the regulating valve 16 is an electrically controlled valve, and its opening and closing are controlled by the control system.

[0077] The working principle of this embodiment is described as follows:

[0078] The first silo 1 refilling process: The first valve 6 remains closed. When the level detection device detects that the powder level in the first silo 1 is below the minimum level, the control system opens the third valve 13. Powder is replenished to the first silo 1 through the second outlet. During this period, the fifth valve 20 opens intermittently, and the second air duct 19 intermittently supplies nitrogen gas with impact force to the second outlet, ensuring the powder flows smoothly out of the second outlet. When the level detection device detects that the powder level in the first silo 1 has reached the maximum level, the control system closes the third valve 13, ending the refilling process in the first silo 1. Simultaneously, the control system closes the fifth valve 20, and the second air duct 19 stops supplying nitrogen gas to the second outlet.

[0079] The loss-in-weight weighing system 10 weighs powder as follows: The rotary valve remains closed, and the control system compares the powder weight detected by the weighing sensor with the set powder amount in real time. When the powder weight detected by the weighing sensor is less than the set powder amount, the control system opens the first valve 6, the second valve 5, and the fourth valve 8. The powder is then replenished to the loss-in-weight weighing system 10 through the first valve 6. During this period, the first air duct 2 supplies nitrogen to the first discharge port, and the vibration device 3 vibrates the bottom of the first hopper 1 to ensure that the powder flows out smoothly from the first discharge port. When the powder weight detected by the weighing sensor reaches the set powder amount, the control system closes the first valve 6, and the feeding of the loss-in-weight weighing system 10 ends.

[0080] Feeding process of mixing device 9: The control system controls the rotary valve to open and controls the rotor speed of the rotary valve according to the set powder quantity and the flow rate of the rotary valve, feeding powder equal to the set powder quantity into mixing device 9. The control system controls the regulating valve 16 to open and controls the opening duration of the regulating valve 16 according to the set liquid raw material quantity and the flow rate of the regulating valve 16, feeding the set amount of liquid raw material into mixing device 9. The rotary valve and regulating valve 16 can open simultaneously without a specific order.

[0081] The weighing process of the loss-in-weight weighing system 10 must not be carried out simultaneously with the feeding process of the first silo 1 or the feeding process of the mixing device 9.

[0082] In summary, this embodiment provides a powder feeding device and a powder-liquid mixing device, which facilitates the smooth discharge of powder from the first silo 1 through the vibration force provided by the vibration device 3. In this embodiment, the mounting structure 4 for installing the vibration device 3 can be installed on the first silo 1 without compromising its sealing performance through welding or bonding. Furthermore, the mounting structure 4 in this embodiment matches the shape of the first silo 1, has a simple structure, and is lightweight, which helps improve the reliability of the connection between the mounting structure 4 and the first silo 1. In addition, this embodiment also includes a first air duct 2, which further facilitates the smooth discharge of powder by blowing gas. This embodiment is applicable to the two-step preparation of carbon fiber, as well as other related fields involving powder conveying and powder-liquid mixing.

[0083] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to preferred embodiments, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present utility model. The implementation schemes in the above embodiments can also be further combined or replaced. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A powder dispensing device, characterized by: The first bin (1) is provided with a first discharge port at the bottom, the first valve (6) is installed at the first discharge port, and the first discharging assembly comprises a vibrating device (3) and a mounting structure (4).

2. A powder dispensing device according to claim 1, characterised in that: The mounting structure (4) comprises a mounting portion (41) and a connecting portion (42) which are fixedly connected; the connecting portion (42) is matched with the outer wall of the first bin (1), and the two are welded or adhesively connected at the shape-matched position; and the vibrating device (3) is detachably connected with the mounting portion (41).

3. A powder dispensing device according to claim 2, wherein: The mounting structure (4) is provided with one mounting portion (41) and a plurality of connecting portions (42), and the mounting portion (41) and the connecting portions (42) are both plate-shaped structures, and all the connecting portions (42) are perpendicular to the mounting portion (41).

4. A powder dispensing device according to any one of claims 1 to 3, wherein: The connecting structure is used for detachably connecting the vibrating device (3) with the mounting structure (4).

5. A powder dispensing device according to any one of claims 1 to 3, wherein: The first discharging assembly further comprises a first air pipe (2) and a second valve (5), the first air pipe (2) is inserted into the first bin (1) and used for blowing gas to the first discharge port, and the second valve (5) is installed at the gas inlet end of the first air pipe (2).

6. A powder dispensing device according to any one of claims 1 to 3, wherein: The level detection device is installed on the first bin (1).

7. A powder dispensing device according to any one of claims 1 to 3, wherein: The second bin (12) is provided with a second discharge port at the bottom, the first bin (1) is provided with a first feeding port at the top, and the third valve (13) is installed between the second discharge port and the first feeding port; and the second discharging assembly is used for accelerating the discharging speed at the third valve (13) through at least one of vibration and air supply.

8. A powder dispensing device according to any one of claims 1 to 3, wherein: The first valve (6) is a rotary valve, or the outlet of the first valve (6) is communicated with a rotary valve.

9. A powder-liquid mixing device characterized by comprising: The powder feeding device comprises a mixing device (9), the first valve (6) in the powder feeding device is communicated with the mixing device (9), and the mixing device (9) is provided with a liquid feeding port.

10. The powder liquid mixing device according to claim 9, characterized in that: The adjusting valve (16) is installed at the liquid feeding port.

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