Powder conveying device with dynamic weighing structure

Abstract

The application provides a powder conveying device with a dynamic weighing structure and relates to the technical field of powder dynamic weighing devices.The powder conveying device comprises a weighing platform, the upper surface of the weighing platform is provided with a feeding assembly, the upper portion of the feeding assembly is provided with a suspended installation of a hopper, the bottom of the hopper is provided with a related air fan, the bottom of the air fan is connected with the feeding assembly through a soft connection component, and the outer side wall of one end of the feeding assembly is fixedly connected with a terminal pipe.The technical scheme has the purpose of switching to small-flow feeding in the middle of feeding powder, sliding the sealing plate to the discharging opening, opening the transition opening to transition the powder into the transition assembly, continuously feeding excess powder in the transition opening through the metering pipe, gradually refining the feeding into the auxiliary pipe through the rotation of the outer spiral blade in the transition assembly, and discharging, which can quickly respond to the switching adjustment of small-flow feeding, the discharging flow is stable, and the precision of small-flow feeding of the material can be improved.

Description

Technical Field

[0001] This invention relates to the field of dynamic weighing devices for powder materials, and more particularly to a powder conveying device with a dynamic weighing structure. Background Technology

[0002] During the feeding process of powder, the flow characteristics of the powder are affected by the bulk density of the material and the size, shape and viscosity of individual particles. Environmental humidity, temperature, vibration or the introduction of different powders can change the characteristics of the powder or powder mixture. When conveying and feeding different powders, the quantitative feeding of the powder is not easy to control due to the influence of the powder flow characteristics. The powder dynamic weighing device can be used to monitor the changes in powder quality in real time and guide the feeding, so as to facilitate the control of the powder feeding flow rate and uniform feeding.

[0003] Currently, when feeding powder via a powder conveying device under the real-time monitoring of a dynamic weighing device, the flow rate is reduced to a low flow rate midway through the feeding process. This is because the powder in the conveying pipe is excessive (the conveying pipe is filled with powder from the previous flow rate feeding stage). Therefore, it is necessary to achieve low flow rate feeding by transferring the powder at a low speed in the early stage of low flow rate feeding. However, the powder with poor flowability is prone to agglomeration and falling off at the powder outlet during the low-speed pushing process in the conveying pipe, resulting in an excessive amount of powder being fed. In subsequent feeding stages, it is necessary to reduce the amount of powder fed, causing significant fluctuations in the low flow rate feeding stage. Therefore, this invention proposes a powder conveying device with a dynamic weighing structure. Summary of the Invention

[0004] The purpose of this invention is to solve the shortcomings of existing technologies, such as the excessive amount of powder that easily falls into clumps during the low-speed feeding process when the powder dynamic weighing device is switched to low-flow feeding in the middle of the powder feeding process, and the large fluctuations that easily occur when feeding powder at low flow rates.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a powder conveying device with a dynamic weighing structure, comprising a weighing platform, a feeding component installed on the upper surface of the weighing platform, a suspended hopper provided above the feeding component, a shut-off fan installed at the bottom of the hopper, the bottom of the shut-off fan being connected to the feeding component via a flexible connecting component, a terminal conduit fixedly connected to the outer side wall of one end of the feeding component, and a transition component installed on the outer side wall of the feeding component;

[0006] The feeding assembly includes a metering conduit mounted on a weighing platform. One end of the metering conduit passes through the side wall of a fixedly connected terminal conduit. The metering conduit has a discharge port and a transition port that communicate with each other on its outer side wall inside the terminal conduit. The metering conduit can receive powder from the hopper and feed it into the terminal conduit through a flexible connection component. The feeding assembly is connected to the transition component through the transition port. A sealing plate is slidably connected to the inner side wall of the transition port.

[0007] The transition assembly includes an external transmission tube fixed to the outer wall of the metering conduit. One end of the external transmission tube is fixedly connected to the outer wall of the terminal conduit. The bottom of the other end of the external transmission tube is fixedly connected to the terminal conduit through a secondary tube. The external transmission tube is connected to the interior of the metering conduit through a transition port. Both ends of the inner wall of the external transmission tube are rotatably connected to a rotating ring. Several external spiral blades are fixed between two rotating rings. A driving component is provided between the rotating ring and the outer wall of the metering conduit.

[0008] Air compensators are installed on the outer wall of the metering conduit and on the top of the hopper, and a stirring device is installed inside the hopper.

[0009] In at least some embodiments, an inner auger is provided inside the metering conduit, and a geared motor is fixedly connected to one end of the inner auger. The geared motor is installed at one end of the metering conduit.

[0010] In at least some embodiments, the flexible connection component includes a double-layered pipe for connecting the airlock and the feeding assembly. A receiving pipe is fixedly connected to the outer wall of one end of the metering conduit. The double-layered pipe includes an outer skin and an inner skin. The outer skin is composed of several segments of skin connected at intervals with short metal woven fabrics. The inner skin is made of antistatic fiber cloth and is bonded to the outer skin. Both ends of the outer skin are movably connected to the airlock and the receiving pipe through sealing clamps. Both ends of the inner skin are equipped with docking inserts for insertion into the ports of the receiving pipe and the airlock.

[0011] In at least some embodiments, two isolation plates are fixedly connected to the outer wall of the metering conduit located in the terminal conduit. The isolation plates are used to separate the lower half of the metering conduit with the discharge port and the transition port from the upper half of the metering conduit. Guide rods are fixedly connected to both sides of the outer transmission pipe located inside the terminal conduit. Both sides of the sealing plate are slidably sleeved on the outer wall of the guide rod. A sealing tube is fixedly connected to the bottom of each isolation plate. One end of each sealing tube penetrates and is fixedly connected to the side wall of the terminal conduit. Cylinders are fixedly connected to both sides of the metering conduit. The output ends of each cylinder are slidably sealed inside the sealing tube. The output ends of each cylinder are fixedly connected to the sealing plate. The output ends of each cylinder are slidably sleeved on the outer wall of the guide rod.

[0012] In at least some embodiments, the driving component includes a transmission gear ring, which is rotatably sleeved on a rotating ring located away from the terminal conduit. A drive motor is fixed to the outer wall of the metering conduit, and a drive gear is mounted on the output end of the drive motor. The drive gear meshes with the transmission gear ring.

[0013] In at least some embodiments, a protective housing is provided on the outer side wall of the transmission gear ring, the drive gear is rotatably connected inside the protective housing, a plurality of the outer spiral blades are fixedly connected to each other by connecting blades, an inner support ring is rotatably connected on the inner side wall of the rotating ring located away from the terminal conduit, the inner support ring is fixedly connected to the outer side wall of the metering conduit, and one end of the outer transmission tube is fixedly connected to the inner support ring through the protective housing.

[0014] In at least some embodiments, the stirring device includes a stirring motor and a stirring support frame. The stirring support frame is installed on the top of the hopper, and the stirring motor is installed on the stirring support frame. The output end of the stirring motor is connected to a stirring rod via a coupling. The bottom end of the stirring rod extends into the interior of the hopper. The stirring rod is rotatably and sealed to the top of the hopper. Several stirring blades are fixed to the rod wall inside the hopper.

[0015] In at least some embodiments, the weighing platform includes a weighing bracket and a support base. A support frame adapted to the metering conduit is installed on the upper surface of the weighing bracket, and three support feet are provided at the bottom of the weighing bracket. A weighing sensor is installed between the bottom of each support foot and the support base.

[0016] In at least some embodiments, the air compensator includes a detachable connecting base, a mounting base fixed to the upper surface of the detachable connecting base, an outer cover movably connected to the top of the mounting base, and a filter provided inside the outer cover, the filter being movably connected to the top of the mounting base.

[0017] Compared with the prior art, the advantages and positive effects of the present invention are as follows:

[0018] 1. In this invention, by setting a transition component, when switching to a small flow rate for powder feeding midway, the sealing plate is slid to the discharge port, opening the transition port to transfer the powder into the transition component. The excess powder continuously fed into the transition port from the metering guide tube is gradually refined and fed into the secondary pipe for discharge through the rotation of the outer spiral blade in the transition component. This design can quickly respond to the switching adjustment of small flow rate supply, and the discharge flow rate is stable, which can improve the small flow rate feeding accuracy of powder conveying.

[0019] 2. In this invention, the silo continuously and quantitatively discharges material to the feeding component through a bottom-mounted airlock fan, replacing the loss-in-weight scale. The airlock fan and the feeding component are connected by a flexible connection component. The feeding component is installed on the weighing platform, and the silo is suspended above it. The two adopt an upper and lower level design, which can flexibly adjust the conveying direction.

[0020] 3. In this invention, the stirring structure continuously feeds the powder in the hopper during the feeding process, avoiding bridging, residue and clumping of the powder inside the hopper. During the feeding process, the air compensator compensates for the negative pressure inside the hopper, so that the air compressor can feed the powder stably and the feeding is smooth. Attached Figure Description

[0021] Figure 1 This invention provides an overall three-dimensional schematic diagram of a powder conveying device with a dynamic weighing structure.

[0022] Figure 2 This invention provides a schematic diagram of the internal structure of the metering conduit and the terminal conduit in a powder conveying device with a dynamic weighing structure.

[0023] Figure 3 This invention provides a schematic diagram of the internal structure of the outer transmission pipe in a powder conveying device with a dynamic weighing structure.

[0024] Figure 4 An exploded view of the transition component in a powder conveying device with a dynamic weighing structure is provided for this invention.

[0025] Figure 5 An exploded view of a flexible connection component in a powder conveying device with a dynamic weighing structure is provided for this invention.

[0026] Figure 6 This invention provides a schematic diagram of the stirring device in a powder conveying device with a dynamic weighing structure;

[0027] Figure 7 This invention provides a schematic diagram of the internal structure of an air compensator in a powder conveying device with a dynamic weighing structure.

[0028] Figure 8 This invention presents a schematic diagram of the sliding state of the sealing plate in the discharge port and the transition port of a powder conveying device with a dynamic weighing structure.

[0029] Legend: 1. Hopper;

[0030] 2. Mixing device; 21. Mixing motor; 22. Mixing support frame; 23. Mixing rod; 24. Mixing blades;

[0031] 3. Turn off the fan;

[0032] 4. Flexible connection components;

[0033] 41. Double-layer tube; 4101. Outer sheath; 4102. Inner sheath; 4103. Connecting cannula;

[0034] 42. Sealing clamps;

[0035] 5. Component delivery;

[0036] 51. Metering conduit; 5101. Inner auger; 5102. Gear motor;

[0037] 52. Material discharge port; 53. Transition port;

[0038] 54. Sealing plate; 5401. Isolation plate; 5402. Guide rod; 5403. Sealing tube; 5404. Cylinder;

[0039] 55. Compensating short pipe; 56. Material receiving pipe;

[0040] 6. Transition component; 61. Outer transmission tube; 62. Rotary ring; 63. Outer spiral blade; 64. Connecting blade; 65. Inner support ring;

[0041] 66. Drive components; 6601. Transmission gear ring; 6602. Drive motor; 6603. Drive gear; 6604. Protective housing;

[0042] 7. Terminal conduit; 71. Secondary conduit;

[0043] 8. Weighing platform; 81. Weighing bracket; 82. Support base;

[0044] 9. Air compensator; 91. Detachable connecting base; 92. Mounting base; 93. Filter; 94. Outer casing. Detailed Implementation

[0045] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0046] Numerous specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways than those described herein, and therefore the invention is not limited to the specific embodiments disclosed in the following specification.

[0047] Example

[0048] according to Figure 1 - Figure 8 ,like Figure 1As shown in the figure, an embodiment of the present invention provides a powder conveying device with a dynamic weighing structure, including a weighing platform 8, a feeding component 5 installed on the upper surface of the weighing platform 8, a suspended hopper 1 above the feeding component 5, a shut-off fan 3 installed at the bottom of the hopper 1, and the bottom of the shut-off fan 3 connected to the feeding component 5 through a flexible connection component 4. Through the flexible connection and the suspended installation of the hopper 1, the weighing of the feeding component 5 by the weighing platform 8 is not affected by the powder in the hopper 1. A terminal conduit 7 is fixedly connected to the outer wall of one end of the feeding component 5. The terminal conduit 7 is used to feed material to the output terminal. A transition component 6 is installed on the outer wall of the feeding component 5.

[0049] The feeding assembly 5 includes a metering conduit 51 mounted on a weighing platform 8. One end of the metering conduit 51 passes through and is fixedly connected to the side wall of the terminal conduit 7. The metering conduit 51 has a discharge port 52 and a transition port 53 connected to each other on the outer side wall inside the terminal conduit 7. The metering conduit 51 can receive powder from the hopper 1 and feed it into the terminal conduit 7 through a flexible connection component 4. The feeding assembly 5 is connected to the transition assembly 6 through the transition port 53. A sealing plate 54 is slidably connected to the inner side wall of the transition port 53. The sealing plate 54 is slidably disposed inside the terminal conduit 7. By controlling the movement of the sealing plate 54, the transition port 53 can be blocked (the sealing plate 54 moves in the discharge port 52 and the transition port 53), and materials can be selectively fed into the terminal conduit 7 and the transition assembly 6.

[0050] like Figure 2 In this process, the transition component 6 includes an outer transmission pipe 61 fixedly attached to the outer wall of the metering conduit 51. One end of the outer transmission pipe 61 is fixedly connected to the outer wall of the terminal conduit 7. The bottom of the other end of the outer transmission pipe 61 is fixedly connected to the terminal conduit 7 through a secondary pipe 71. The outer transmission pipe 61 is connected to the interior of the metering conduit 51 through a transition port 53. Both ends of the inner wall of the outer transmission pipe 61 are rotatably connected to a rotating ring 62. Several outer spiral blades 63 are fixedly connected between two rotating rings 62. A driving component 66 is provided between the rotating ring 62 and the outer wall of the metering conduit 51. The driving component 66 is used to drive the rotating ring 62 to drive the outer spiral blades 63 to rotate in order to transfer the powder inside the outer transmission pipe 61.

[0051] Air compensators 9 are installed on the outer wall of the metering conduit 51 in the terminal conduit 7 and on the top of the hopper 1. A stirring device 2 is installed inside the hopper 1.

[0052] like Figure 6In this process, the stirring device 2 includes a stirring motor 21 and a stirring support frame 22. The stirring support frame 22 is installed on the top of the hopper 1, and the stirring motor 21 is installed on the stirring support frame 22. The output end of the stirring motor 21 is connected to a stirring rod 23 through a coupling. The bottom end of the stirring rod 23 extends into the interior of the hopper 1. The stirring rod 23 is rotatably and sealed to the top of the hopper 1. Several stirring blades 24 are fixed to the rod wall inside the hopper 1. When the airlock 3 feeds the powder into the metering guide tube 51 at the bottom of the hopper 1, the stirring motor 21 drives the stirring blades 24 to rotate through the stirring rod 23, which can continuously stir the powder inside the hopper 1, prevent the powder from bridging, clumping, or cavitation, and make the feeding of the airlock 3 more stable.

[0053] like Figure 2 In the metering conduit 51, an inner auger 5101 is provided inside, and a reduction motor 5102 is fixedly connected to one end of the inner auger 5101. The reduction motor 5102 is installed at one end of the metering conduit 51.

[0054] like Figure 2 and Figure 4 In the terminal conduit 7, two isolation plates 5401 are fixed to the outer wall of the metering conduit 51. The isolation plates 5401 divide the terminal conduit 7 into two areas (separating the lower half of the terminal conduit 7 with the discharge port 52 and transition port 53 from the upper half of the terminal conduit 7), separating the active areas of the discharge port 52, transition port 53, and sealing plate 54 to prevent powder from rising and accumulating on the outer surface of the metering conduit 51 within the terminal conduit 7. Figure 2 In this configuration, guide rods 5402 are fixedly connected to both sides of one end of the external transmission pipe 61 located inside the terminal conduit 7. Both sides of the sealing plate 54 are slidably sleeved onto the outer walls of the guide rods 5402. Figure 4 In this configuration, a sealing tube 5403 is fixedly connected to the bottom of each isolation plate 5401. One end of each sealing tube 5403 passes through and is fixedly connected to the side wall of the terminal conduit 7. Cylinders 5404 are fixedly connected to both sides of each metering conduit 51. The output ends of each cylinder 5404 are slidably connected to the inside of the sealing tube 5403. The output ends of each cylinder 5404 are fixedly connected to the sealing plate 54. The output ends of each cylinder 5404 are slidably sleeved on the outer side wall of the guide rod 5402. By activating the cylinder 5404, its output end is controlled to retract, which can drive the sealing plate 54 to slide along the guide rod 5402, so that the port of the metering conduit 51 is connected to the external transmission pipe 61 through the transition port 53. Alternatively, the sealing plate 54 can be controlled to close the transition port 53, so that the metering conduit 51 can guide the material into the terminal conduit 7 through the discharge port 52 for a large flow of powder transmission.

[0055] like Figure 3 and Figure 4 In this process, the driving component 66 includes a transmission gear ring 6601, which is rotatably sleeved on a rotating ring 62 located away from the terminal conduit 7. A driving motor 6602 is fixedly connected to the outer wall of the metering conduit 51. A driving gear 6603 is installed on the output end of the driving motor 6602. The driving gear 6603 meshes with the transmission gear ring 6601. When the driving motor 6602 is started, it drives the driving gear 6603 to rotate through its output end, thereby starting the driving motor 6602 to rotate synchronously in the outer transmission pipe 61. This causes the rotating ring 62 to drive the outer spiral blade 63 to rotate between the outer transmission pipe 61 and the metering conduit 51, thus transferring the powder at the transition port 53 to the secondary pipe 71.

[0056] like Figure 3 and Figure 4 In this process, a protective housing 6604 is provided on the outer wall of the transmission gear ring 6601. The drive gear 6603 is rotatably connected inside the protective housing 6604. Several outer spiral blades 63 are fixedly connected to each other by connecting blades 64. An inner support ring 65 is rotatably connected to the inner wall of the rotating ring 62 located away from the terminal conduit 7. The inner support ring 65 is fixedly connected to the outer wall of the metering conduit 51 to enhance the stability of the rotating ring 62 when rotating. One end of the outer transmission pipe 61 is fixedly connected to the inner support ring 65 through the protective housing 6604 to enhance the stability of the connection between the outer transmission pipe 61 and the metering conduit 51, thereby enhancing the stability of the rotating ring 62 when the outer transmission pipe 61 rotates.

[0057] Speed ​​encoders are installed on one end of the inner auger 5101 and the output end of the drive motor 6602 to monitor the rotation speed of the inner auger 5101 and the rotation speed of the outer spiral blade 63 in real time.

[0058] like Figure 1 In the weighing platform 8, there are weighing brackets 81 and support bases 82. The upper surface of the weighing bracket 81 is equipped with a support frame that is adapted to the measuring guide tube 51. The bottom of the weighing bracket 81 is provided with three support feet. Weighing sensors are installed between the bottom of the support feet and the support base 82.

[0059] like Figure 7In this process, the air compensator 9 includes a detachable connecting base 91, and a mounting base 92 is fixedly connected to the upper surface of the detachable connecting base 91. An outer cover 94 is movably connected to the top of the mounting base 92. A filter 93 is provided inside the outer cover 94 and is movably connected to the top of the mounting base 92. When the air shut-off fan 3 continuously feeds powder into the metering conduit 51 at the bottom of the hopper 1, a negative pressure appears in the upper layer of powder inside the hopper 1. External air enters the interior through the upper air hole on the outer cover 94, is filtered by the filter 93, and then enters the hopper 1 through the mounting base 92 and the detachable connecting base 91 to compensate for the air in the hopper 1 and balance the internal air pressure of the hopper 1. Similarly, the air compensator 9 installed on the compensation short pipe 55 can compensate for the air in the metering conduit 51.

[0060] like Figure 1 and Figure 5 In the process, the flexible connection component 4 includes a double-layer pipe 41 for connecting the airlock 3 and the feeding assembly 5. A receiving pipe 56 is fixedly connected to the outer wall of one end of the metering conduit 51. The double-layer pipe 41 includes an outer skin 4101 and an inner skin 4102. The outer skin 4101 is composed of several segments of skin and short metal woven fabric connected at intervals, which stably supports the shape of the transmission pipe, ensures smooth flow of powder, and, as Figure 5 The inner skin is segmented and has a ring-shaped, hollow design. Each segment is connected by short metal woven fabric to prevent the airlock 3 from interfering with the quality monitoring data of the weighing platform 8 when it is connected to the receiving pipe 56 via the outer skin 4101. The inner skin 4102 is made of anti-static fiber cloth and has a smooth interior to reduce powder adhesion and residue. The inner skin 4102 is bonded to the outer skin 4101. Both ends of the outer skin 4101 are movably connected to the airlock 3 and the receiving pipe 56 via sealing clamps 42. Both ends of the inner skin 4102 are equipped with docking tubes 4103, which are used to connect to the openings of the receiving pipe 56 and the airlock 3 to prevent powder from entering the gap between the outer skin 4101 and the inner skin 4102.

[0061] In this embodiment, the feeding component 5 is placed on the weighing platform 8 to monitor the mass change. The powder inside the hopper 1 is quantitatively fed into the flexible connection component 4 by the airlock 3. The powder is fed into the metering conduit 51 through the flexible connection component 4 and the receiving pipe 56. The weight data is monitored in real time by the weighing sensor at the bottom of the weighing bracket 81. The flow rate of the inner auger 5101 fed into the terminal conduit 7 through the discharge port 52 is controlled. During the feeding process into the terminal conduit 7 according to the set feeding plan, the speed encoder installed at one end of the inner auger 5101 monitors the rotation speed of the inner auger 5101 in real time. The feeding flow rate can be adjusted by adjusting the feeding amount of the airlock 3 and the speed of the reduction motor 5102.

[0062] When switching to low-flow powder feeding during the feeding process, the control plate 54 slides into the discharge port 52, opening the transition port 53. The powder fed in the metering guide tube 51 enters the space between the metering guide tube 51 and the outer transmission tube 61 through the transition port 53. The drive component 66 controls the outer spiral blade 63 to rotate between the outer transmission tube 61 and the metering guide tube 51. Under the drive of the outer spiral blade 63, the powder is transferred to the auxiliary tube 71 connected to the bottom of the other end of the outer transmission tube 61. The powder in the transition port 53 is gradually transferred from the bottom layer, and the powder inside the metering guide tube 51 is transferred in portions. The speed encoder installed on the output shaft of the drive motor 6602 monitors the speed of the outer spiral blade 63 in real time to avoid frequent overfeeding and large feeding fluctuations, thus achieving stable low-flow feeding.

[0063] It is worth noting that in the initial stage of implementing the feeding plan, the transition port 53 can be opened in advance, and the powder can be filled into the external transmission pipe 61 in advance through the outer spiral blade 63 to the point close to the connection with the auxiliary pipe 71, which can further accelerate the response speed of small flow powder feeding.

[0064] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments that can be applied to other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A powder conveying device with a dynamic weighing structure, comprising a weighing platform (8), characterized in that: The upper surface of the weighing platform (8) is equipped with a feeding assembly (5), and a suspended hopper (1) is provided above the feeding assembly (5). A fan (3) is installed at the bottom of the hopper (1). The bottom of the fan (3) is connected to the feeding assembly (5) through a flexible connection component (4). A terminal conduit (7) is fixed to the outer wall of one end of the feeding assembly (5), and a transition component (6) is installed on the outer wall of the feeding assembly (5). The feeding assembly (5) includes a metering conduit (51) mounted on a weighing platform (8). One end of the metering conduit (51) passes through and is fixedly connected to the side wall of the terminal conduit (7). The metering conduit (51) has a discharge port (52) and a transition port (53) connected to each other on the outer side wall inside the terminal conduit (7). The metering conduit (51) can receive powder from the hopper (1) through a flexible connection component (4) and feed it into the terminal conduit (7). The feeding assembly (5) is connected to the transition assembly (6) through the transition port (53). A sealing plate (54) is slidably connected to the inner side wall of the transition port (53). The transition assembly (6) includes an external transmission tube (61) fixed to the outer wall of the metering conduit (51). One end of the external transmission tube (61) is fixedly connected to the outer wall of the terminal conduit (7). The bottom of the other end of the external transmission tube (61) is fixedly connected to the terminal conduit (7) through a secondary tube (71). The external transmission tube (61) is connected to the interior of the metering conduit (51) through a transition port (53). Both ends of the inner wall of the external transmission tube (61) are rotatably connected to a rotating ring (62). Several external spiral blades (63) are fixed between the two rotating rings (62). A driving component (66) is provided between the rotating ring (62) and the outer wall of the metering conduit (51). The metering conduit (51) is equipped with an air compensator (9) on the outer wall of the terminal conduit (7) and on the top of the hopper (1). The hopper (1) is equipped with a stirring device (2).

2. The powder conveying device with a dynamic weighing structure according to claim 1, characterized in that: The metering conduit (51) is provided with an inner auger (5101), and a geared motor (5102) is fixedly connected to one end of the inner auger (5101). The geared motor (5102) is installed at one end of the metering conduit (51).

3. The powder conveying device with a dynamic weighing structure according to claim 1, characterized in that: The flexible connection component (4) includes a double-layer pipe (41) for connecting the airlock (3) and the feeding component (5). A receiving pipe (56) is fixedly connected to the outer wall of one end of the metering conduit (51). The double-layer pipe (41) includes an outer skin (4101) and an inner skin (4102). The outer skin (4101) is composed of several sections of skin and short metal woven cloth connected at intervals. The inner skin (4102) is an antistatic fiber cloth. The inner skin (4102) is bonded to the outer skin (4101). The two ends of the outer skin (4101) are movably connected to the airlock (3) and the receiving pipe (56) through sealing clamps (42). Both ends of the inner skin (4102) are equipped with docking tubes (4103). The docking tubes (4103) are used to be inserted into the pipe openings of the receiving pipe (56) and the airlock (3).

4. The powder conveying device with a dynamic weighing structure according to claim 1, characterized in that: Two isolation plates (5401) are fixed to the outer wall of the metering conduit (51) in the terminal conduit (7). The isolation plates (5401) are used to separate the lower half of the metering conduit (51) with the discharge port (52) and the transition port (53) from the upper half of the metering conduit (51) in the terminal conduit (7). The outer transmission pipe (61) is fixed to both sides of one end inside the terminal conduit (7) with guide rods (5402). The sealing plate (54) is slidably sleeved on both sides of the outer wall of the guide rods (5402). The bottom of each isolation plate (5401) is fixedly connected to a sealing tube (5403). One end of each sealing tube (5403) passes through the side wall of the fixedly connected terminal conduit (7). Both sides of each metering conduit (51) are fixedly connected to a cylinder (5404). The output end of each cylinder (5404) is sealed and slidably connected to the inside of the sealing tube (5403). The output end of each cylinder (5404) is fixedly connected to the sealing plate (54). The output end of each cylinder (5404) is slidably sleeved on the outer side wall of the guide rod (5402).

5. A powder conveying device with a dynamic weighing structure according to claim 1, characterized in that: The drive component (66) includes a transmission gear ring (6601), which is rotatably sleeved on a rotating ring (62) located away from the terminal conduit (7). A drive motor (6602) is fixedly connected to the outer wall of the metering conduit (51). A drive gear (6603) is installed on the output end of the drive motor (6602), and the drive gear (6603) meshes with the transmission gear ring (6601).

6. A powder conveying device with a dynamic weighing structure according to claim 5, characterized in that: A protective housing (6604) is provided on the outer wall of the transmission gear ring (6601). The drive gear (6603) is rotatably connected inside the protective housing (6604). Several outer spiral blades (63) are fixedly connected to each other by connecting blades (64). An inner support ring (65) is rotatably connected to the inner wall of the rotating ring (62) located away from the terminal conduit (7). The inner support ring (65) is fixedly connected to the outer wall of the metering conduit (51). One end of the outer transmission tube (61) is fixedly connected to the inner support ring (65) through the protective housing (6604).

7. A powder conveying device with a dynamic weighing structure according to claim 1, characterized in that: The stirring device (2) includes a stirring motor (21) and a stirring support frame (22). The stirring support frame (22) is installed on the top of the hopper (1). The stirring motor (21) is installed on the stirring support frame (22). The output end of the stirring motor (21) is connected to a stirring rod (23) through a coupling. The bottom end of the stirring rod (23) extends into the interior of the hopper (1). The stirring rod (23) is sealed and rotatably connected to the top of the hopper (1). Several stirring blades (24) are fixedly attached to the rod wall inside the hopper (1).

8. A powder conveying device with a dynamic weighing structure according to claim 1, characterized in that: The weighing platform (8) includes a weighing bracket (81) and a support base (82). The upper surface of the weighing bracket (81) is equipped with a support frame that is adapted to the measuring conduit (51). The bottom of the weighing bracket (81) is provided with three support feet. Weighing sensors are installed between the bottom of the support feet and the support base (82).

9. A powder conveying device with a dynamic weighing structure according to claim 1, characterized in that: The air compensator (9) includes a detachable connecting base (91), and a mounting base (92) is fixedly connected to the upper surface of the detachable connecting base (91). An outer cover (94) is movably connected to the top of the mounting base (92). A filter (93) is provided inside the outer cover (94), and the filter (93) is movably connected to the top of the mounting base (92).

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