Powder double-layer suction pipe matched with upper-opening storage barrel and method

Abstract

The invention discloses a powder double-layer suction pipe matched with an upper-opening storage barrel and a method, and relates to the technical field of uranium conversion related equipment. The device is used in cooperation with a storage barrel with an upper opening. The device comprises a double-layer pipe and a material gathering plate, the double-layer pipe comprises an outer pipe and an inner pipe coaxially arranged in the center of an inner hole of the outer pipe, an annular column area is formed between the inner pipe and the outer pipe, and a plurality of feeding holes are formed in the lower end of the inner pipe; the plurality of material gathering plates are annularly and uniformly distributed and fixedly connected to the outer circular surface of the lower end of the outer pipe; a feeding hole is formed in the excircle surface of the lower end of the outer pipe. A powder suction method matched with a storage barrel with an upper opening is used for being matched with a negative pressure system to suck powder materials in the storage barrel with the upper opening, and by being matched with an original eccentric rotation suction method, powder material residues are avoided, and the suction efficiency is improved. The invention provides a powder material suction structure and a powder material suction method which are adaptive to an upper-opening storage barrel based on a technical route of conveying powder materials through a gas path, and the powder material suction structure and the powder material suction method are particularly suitable for efficient and residue-free transfer of UO2 powder in the nuclear fuel preparation process.

Description

Technical Field

[0001] The present invention relates to the technical field of uranium conversion related equipment, in particular to a double-layer powder material suction pipe adapted for an upper opening material storage barrel and a method thereof. Background Art

[0002] The nuclear fuel production process involves two steps: uranium purification and uranium conversion. Purification involves converting uranium ore concentrate into refined UO2, while conversion involves converting refined UO2 into UF6. The UO2 powder produced in the purification step is stored in specialized tanks for future use. The conversion step involves transferring UO2 powder from multiple tanks into a transfer silo (referred to as the UO2 dosing operation).

[0003] Patent publication number CN116853823A discloses a "pneumatically conveyed radioactive powder feeding system" for the aforementioned UO2 feeding operation. The storage tank is removed from the first floor of the plant, and the UO2 powder is fed into a delivery pipeline. The negative pressure provided by a vacuum pump drives the UO2 powder through the pipeline, ultimately delivering it to a transfer tank on the third floor. Compared to transporting the powder along with the storage tank, this solution offers a simpler structure and streamlined process.

[0004] However, the storage tank in this solution has the problems of complex structure (embodied in that the lower end opening of the storage tank is a double-cover structure of an inner sealing cover + an outer protective cover, the inner sealing cover is opened or closed by an operating panel located at the upper end of the storage tank, and the outer protective cover is a complex mechanism assembled from multiple components), high manufacturing cost (embodied in the large number of components), difficulty in automated adaptation (embodied in that an automatic cover-opening mechanism for opening the inner sealing cover and an automatic cover-opening mechanism for opening the outer protective cover need to be designed separately, as well as a sealing docking mechanism for docking with the lower end opening of the storage tank, and multiple mechanisms need to coordinate with each other) and high probability of failure (embodied in that a screw-nut substructure is used between the inner sealing cover and the operating panel, and the powder inside the storage tank can easily enter the gap between the screw and the nut, making it difficult to twist the operating panel, and thus making it difficult to open or close the inner sealing cover).

[0005] Currently, due to the need for process improvement, relevant companies are preparing to phase out storage tanks with the above-mentioned structure and replace them with top-opening storage barrels (such as milk barrels) that are simple in structure, low in manufacturing cost, easy to automate, and stable and reliable. These top-opening storage barrels consist solely of a barrel body and a cover located at the upper end of the barrel body. Therefore, it is necessary to design a negative pressure suction structure and method for powder materials suitable for top-opening storage barrels based on the technical route of pneumatic conveying of powder materials. Summary of the Invention

[0006] The purpose of the present invention is to overcome the shortcomings of the existing technology and provide a double-layer powder material suction pipe and method adapted for an upper opening storage barrel. It is based on the technical route of pneumatically conveying powder materials and provides a powder material suction structure and method adapted for an upper opening storage barrel.

[0007] The technical solution of the present invention is: a double-layer powder material straw adapted for use with an upper-opening material storage barrel; the upper-opening material storage barrel comprises a barrel body with an opening at the center of the upper end and an upper cover with a movable cover mounted on the opening; the lower middle section of the barrel body is a straight cylindrical section, and the upper section of the barrel body is a reduced diameter section, so that the opening size of the barrel body is smaller than the cross-sectional size of the straight cylindrical section of the barrel body; A double-layer straw for powder material adapted for an upper open storage barrel comprises a double-layer tube and a material gathering plate; the double-layer tube comprises an outer tube and an inner tube coaxially and centrally arranged in the inner hole of the outer tube, a ring column area is formed between the inner tube and the outer tube, the inner tube and the outer tube are fixedly connected as one at the lower end face by a ring plate, the upper end of the inner tube extends from the upper end port of the outer tube, the upper end of the inner tube is provided with a plurality of connecting holes for connecting to the atmosphere, and the lower end of the inner tube is provided with a plurality of feed holes; a plurality of material gathering plates are evenly distributed in a ring shape and fixedly connected to the outer cylindrical surface of the lower end of the outer tube; a feed port is provided on the outer cylindrical surface of the lower end of the outer tube between any two adjacent material gathering plates.

[0008] A further technical solution of the present invention is: one end of the gathering plate is connected to the outer circumferential surface of the lower end of the outer tube, and the other end extends radially outward of the outer tube; the gathering plate is arranged obliquely relative to the axis of the outer tube.

[0009] A further technical solution of the present invention is: the feed holes on the inner tube are provided with multiple groups along the axial direction of the inner tube, each group includes multiple feed holes that surround the inner tube and are evenly distributed in a ring shape; the cross-sectional area of a single feed hole is 5%-15% of the cross-sectional area of a single feed port.

[0010] A further technical solution of the present invention is that all the aggregate plates are connected into a whole by a reinforcement ring, which is a rigid component and is connected to the radial outer edges of all the aggregate plates.

[0011] The technical solution of the present invention is: a method for sucking powder material adapted to an upper-opening storage barrel, based on the above-mentioned "double-layered straw for powder material adapted to an upper-opening storage barrel", and the "double-layered straw for powder material adapted to an upper-opening storage barrel" is subordinate to the "powder material sucking device for adapting to an upper-opening storage barrel"; A powder material suction device adapted for an upper opening storage barrel, comprising, in addition to a "double-layer powder material suction pipe adapted for an upper opening storage barrel," a barrel support device and a suction pipe moving device; The barrel support device includes a base and a rotating platform movably mounted on the upper end of the base, a barrel positioning area is provided on the upper end of the rotating platform, and a first driving mechanism for driving the rotating platform to move horizontally and linearly on the base is provided between the base and the rotating platform; The straw moving device includes a support frame, a second drive mechanism, and a third drive mechanism; the support frame is fixedly mounted on the base; the second drive mechanism is mounted on the upper end of the support frame and is provided with an actuator A for horizontal linear movement; the third drive mechanism is mounted on actuator A and is provided with an actuator B for vertical lifting movement; The connection relationship between the "double-layer powder material straw adapted for the upper-opening storage barrel" and the straw moving device is as follows: the upper end of the inner tube is directly or indirectly fixedly connected to the actuator B; the straw device is driven by the second drive mechanism to move horizontally and linearly, so that its vertical downward projection area faces or avoids the barrel positioning area of the rotating platform; and the straw device is driven by the third drive mechanism to move vertically up and down, so that it extends into or out of the barrel through the upper opening of the barrel. Before executing the method, the "powder material suction device for adapting to the upper opening storage barrel" is in an initial state. In the initial state, the suction tube mechanism is moved to the highest position of its lifting stroke by the vertical lifting action of the third driving mechanism; the upper end of the inner tube is connected to the external negative pressure source; Based on the above initial state, the method process is as follows: S01, hoisting the upper opening storage barrel: A. Control the first drive mechanisms in all the barrel support devices simultaneously or in no particular order, so that all the rotary platforms move to the operating range of the staggered straw devices, thereby facilitating the subsequent lifting of the upper open storage barrel; B. First, open the upper cover of the upper-opening storage barrel, and then use a crane to lift the upper-opening storage barrel filled with powder material into the barrel positioning area of the rotary platform. During the lifting and placement process, the lower end outer wall of the upper-opening storage barrel rolls with all the guide wheels, thereby being corrected and centered by all the guide wheels, and finally the upper-opening storage barrel falls in the center of the barrel positioning area; In this step, repeat step B and hoist and place an upper-opening storage barrel in the barrel positioning area of each barrel support device; S02, upper and lower alignment adjustment: A. The first driving mechanism in the target barrel support device is actuated to move the corresponding rotary platform and the target upper-opening storage barrel carried thereon into the operating range of the straw device; B. The second driving mechanism is activated to move the straw device to the position directly above the opening of the target upper opening storage barrel; S03, negative pressure suction operation: The third driving mechanism is activated to lower the suction device. When the lower end of the suction device enters the opening of the target upper-opening material storage barrel, the powder material suction operation is started. The suction operation includes a "central suction stage" and a "deflected suction stage" in sequence. The "Centered Suction Phase" operates as follows: A. Perform the following two tasks simultaneously: ①. The external negative pressure source is activated, so that the powder material in the inner cavity of the upper opening storage barrel enters the annular column interlayer through the feed port of the outer tube under the action of negative pressure, and then enters the inner hole of the inner tube through the feed hole of the inner tube. It flows along the airflow in the inner hole of the inner tube to the upper end of the inner tube and is finally discharged from the upper port of the inner tube; ② The third drive mechanism is activated, causing the suction device to descend at a speed that matches the amount of powder material sucked; B. When all the material collecting plates at the lower end of the suction pipe device enter the straight section from the reduced diameter section of the upper opening storage barrel, the "centering suction stage" ends; The "deflection suction phase" operates as follows: A. The second drive mechanism is activated to move the straw device radially outward from the inner cavity of the target upper-opening storage barrel until the minimum cylinder that can accommodate all the gathering plates is less than 10 mm from the inner wall of the straight section of the upper-opening storage barrel, and the straw device stops moving. At this time, the straw device is arranged eccentrically. B. Perform the following three tasks simultaneously: ①. The rotary platform starts, driving the target upper opening storage barrel placed on it to rotate; ② The third drive mechanism is activated, causing the suction device to descend at a speed that matches the amount of powder material sucked; ③. The external negative pressure source is activated, causing the powder material in the inner cavity of the upper opening storage barrel to enter the annular column interlayer through the feed port of the outer tube under the action of negative pressure, and then enter the inner hole of the inner tube through the feed hole of the inner tube. It flows along the airflow in the inner hole of the inner tube to the upper end of the inner tube and is finally discharged from the upper end of the inner tube; The three items in this step are executed simultaneously, so that the powder material at the inner cavity wall of the upper opening storage barrel is pushed by the gathering plate and moves toward the direction close to the outer tube feed port, so as to improve the suction effect of the powder material at the inner cavity wall of the upper opening storage barrel; and the suction straw device forms a spiral downward motion trajectory in the reduced diameter section of the inner cavity of the upper opening storage barrel, thereby achieving uniform and residue-free suction of the powder material.

[0012] A further technical solution of the present invention is: the detailed process of step S01 is as follows: A. Control the first drive mechanisms in all the barrel support devices simultaneously or in no particular order, so that all the rotary platforms move to the operating range of the staggered straw devices, thereby facilitating the subsequent lifting of the upper open storage barrel; B. First, open the upper cover of the upper-opening storage barrel, and then use a crane to lift the upper-opening storage barrel filled with powder material into the barrel positioning area of the rotary platform. During the lifting and placement process, the lower end outer wall of the upper-opening storage barrel rolls with all the guide wheels, thereby being corrected and centered by all the guide wheels, and finally the upper-opening storage barrel falls in the center of the barrel positioning area; In this step, repeat step B and hoist and place an upper-opening storage barrel in the barrel positioning area of each barrel support device.

[0013] A further technical solution of the present invention is: the detailed process of step S02 is as follows: A. The first driving mechanism in the target barrel support device is actuated to move the corresponding rotary platform and the target upper-opening storage barrel carried thereon into the operating range of the straw device; B. The second driving mechanism is activated to move the straw device to the position directly above the opening of the target upper opening storage barrel.

[0014] Compared with the prior art, the present invention has the following advantages: 1. Based on the technical route of pneumatically conveying powder materials, it provides a powder material suction structure and method adapted to the upper opening storage barrel, which is particularly suitable for the efficient and residue-free transfer of UO2 powder in the nuclear fuel preparation process.

[0015] 2. The gathering plate optimizes powder guidance: The inclined gathering plate pushes the powder material near the barrel wall to flow toward the outer tube feed port during the rotation of the upper opening storage barrel, solving the problem of high residual rate at the barrel wall of traditional suction devices. It is especially suitable for the reduced diameter structure of the upper opening storage barrel.

[0016] 3. Depth adaptability of the double-tube structure: Multiple groups of axially distributed feed holes are set at the lower end of the inner tube, so that the suction device can capture powder nearby when sucking at different depths (the upper holes suck surface powder, and the lower holes suck bottom powder), reducing the distance the powder falls.

[0017] 4. Anti-interference performance of the dual-tube structure: During the deflection suction stage, the powder in the barrel is unevenly distributed. The interlayer between the ring and the column acts as a "temporary powder storage area" to smooth the fluctuating powder flow and avoid pulse breakdown (powder back-spray) caused by sudden changes in the airflow in the inner tube.

[0018] 5. Anti-clogging performance of the double-tube structure: 5.1 Compared with the single-tube structure where the feed port is easily buried by powder close to the barrel wall, the double-tube structure uses a ring-column interlayer to buffer, effectively avoiding powder blockage and maintaining continuous suction capacity; 5.2 The interlayer between the ring and column serves as a "temporary powder storage area" to temporarily store high-concentration powder flow, preventing high-concentration powder flow from directly entering the inner tube and causing instantaneous blockage; 5.3 Based on the characteristic that the cross-sectional area of the feed port is greater than the cross-sectional area of the feed hole (ratio of 5%-15%), a flow velocity gradient is formed from the annular column sandwich to the inner tube (the flow velocity at the feed hole suddenly increases), and the high-speed airflow is used to cut the powder agglomerate to prevent bridging; 5.4 A connecting hole is set at the upper end of the inner tube to directly connect to the atmosphere to balance the pressure difference between the inner tube and the annular column sandwich, so as to prevent the powder from being adsorbed on the inner wall of the sandwich due to negative pressure.

[0019] The present invention is further described below with reference to the figures and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the present invention under the first viewing angle; Figure 2 Schematic diagram of the structure of the present invention under the second viewing angle; Figure 3 This is a schematic structural diagram of the upper device "powder material suction device adapted to the upper opening storage barrel" of the present invention; Figure 4 A schematic diagram of the structure of the barrel support device in the "powder material suction device for adapting to the upper opening storage barrel"; Figure 5 A schematic diagram of the "centering suction stage" in the suction method; Figure 6 Schematic diagram of the “deflection suction phase” in the suction method.

[0021] Legend: barrel body 11; base 21; rotating platform 22; barrel positioning area 221; guide wheel 222; slide rail 231; slider 232; lead screw 233; nut 234; motor X235; support frame 31; second drive mechanism 32; action actuator A321; third drive mechanism 33; action actuator B331; inner tube 41; connecting hole 411; feed hole 412; outer tube 42; feed port 421; annular plate 43; material gathering plate 44; ring column interlayer 45; reinforcement ring 46. DETAILED DESCRIPTION Example 1

[0022] like Figure 1-2 The double-layered powder feeding straw shown here is suitable for use with a top-opening storage barrel. The top-opening storage barrel comprises a barrel body 11 with an opening at the center of its upper end and an upper cover 12 that is removably mounted on the opening. The lower section of barrel body 11 is a straight cylindrical section, while the upper section of barrel body 11 is a reduced diameter section, making the opening of barrel body 11 smaller than the cross-sectional dimensions of the straight cylindrical section.

[0023] A double-layered straw for powder materials suitable for use in open-top storage barrels comprises a double-layered tube and a material collecting plate 44. The double-layered tube comprises an outer tube 42 and an inner tube 41 coaxially positioned centrally within the inner bore of the outer tube 42. An annular column sandwich 45 is formed between the inner and outer tubes 41 and 42. The inner and outer tubes 41 and 42 are integrally connected at their lower end faces by an annular plate 43. The upper end of the inner tube 41 extends from the upper end of the outer tube 42. Multiple communication holes 411 for atmospheric communication are defined at the upper end of the inner tube 41, while multiple feed holes 412 are defined at the lower end of the inner tube 41. Three material collecting plates 44 are evenly distributed in an annular pattern and fixedly attached to the outer circumferential surface of the lower end of the outer tube 42. A feed port 421 is defined between any two adjacent material collecting plates 44 on the outer circumferential surface of the lower end of the outer tube 42.

[0024] Preferably, one end of the material gathering plate 44 is connected to the outer circumferential surface of the lower end of the outer tube 42, and the other end extends radially outward of the outer tube 42. The material gathering plate 44 is arranged obliquely relative to the axis of the outer tube 42.

[0025] Preferably, the inner tube 41 is provided with multiple groups of feed holes 412 along the axial direction of the inner tube 41, each group including multiple feed holes 412 uniformly distributed in an annular pattern around the inner tube 41. The cross-sectional area of a single feed hole 412 is 5%-15% of the cross-sectional area of a single feed port 421.

[0026] Preferably, all the aggregate plates 44 are connected as a whole by a reinforcement ring 46. The reinforcement ring 46 is a rigid component. The reinforcement ring 46 is connected to the radial outer edges of all the aggregate plates 44, thereby increasing the structural strength of the single-piece aggregate plate 44 and reducing the probability of the aggregate plate 44 breaking during the process of pushing powder material.

[0027] Briefly describe the upper device structure of the present invention: like Figure 3-4 As shown, the aforementioned "double-layered powder material suction straw adapted for a top-opening storage barrel" is part of the "powder material suction device adapted for a top-opening storage barrel." In addition to the "double-layered powder material suction straw adapted for a top-opening storage barrel," the "powder material suction device adapted for a top-opening storage barrel" also includes a "barrel support device" and a "suction straw moving device."

[0028] The barrel support device includes a base 21 and a rotating platform 22 movably mounted on the upper end of the base 21. A barrel positioning area 221 is provided on the upper end of the rotating platform 22. A first drive mechanism is provided between the base 21 and the rotating platform 22 for driving the rotating platform 22 to move horizontally and linearly on the base 21. The first drive mechanism is a mobile drive structure based on a screw-nut pair; it includes a slide rail 231, a slider 232, a screw 233, a nut 234, and a motor X235. The slide rail is fixedly mounted on the upper end of the base; the slider is fixedly mounted on the lower end of the rotating platform and slidably engages with the slide rail; the screw is arranged parallel to the slide rail and rotatably mounted on the upper end of the base; the nut is threadedly engaged with the screw and fixedly connected to the lower end of the rotating platform; the shaft of the motor X is connected to one end of the screw via a coupling, and the motor X drives the screw to rotate, thereby driving the nut and the rotating platform 22 to move along the screw.

[0029] The straw moving device includes a support frame 31, a second drive mechanism 32, and a third drive mechanism 33. The support frame 31 is fixedly mounted on the base 21. The second drive mechanism 32 is mounted on the upper end of the support frame 31 and is equipped with an actuator A321 for horizontal linear movement. The third drive mechanism 33 is mounted on actuator A and is equipped with an actuator B331 for vertical lifting movement.

[0030] The connection relationship between the "double-layer straw for powder material adapted to the upper opening storage barrel" and the "straw moving device" is as follows: the upper end of the inner tube is directly or indirectly fixedly connected to the action actuator B; the straw device is driven by the second driving mechanism to move horizontally in a straight line, so that its vertical downward projection area faces or avoids the barrel positioning area of the rotating platform; the straw device is driven by the third driving mechanism to move vertically up and down, so that it extends into the barrel body or exits the barrel body through the opening at the upper end of the barrel body.

[0031] Preferably, there are multiple sets of barrel support devices, all of which are arranged in a line in a straight line, and all of which share the same base 21 .

[0032] Preferably, a turntable for supporting an upper-opening storage barrel is provided at the upper end of the rotating platform 22, and a plurality of guide wheels 222 are provided at the edge of the turntable for guiding the upper-opening storage barrel to be lowered and are evenly distributed in a ring shape. The circular area formed by all the guide wheels 222 on the upper surface of the turntable is the barrel positioning area 221.

[0033] Briefly describe the working process / principle of the present invention: The aforementioned "double-layered powder material suction tube for top-opening storage barrels" is part of the "powder material suction device for top-opening storage barrels." This device is designed to work with a negative pressure system to extract powder from the top-opening storage barrel. Its unique "eccentric rotation" suction method prevents residual powder from remaining in the barrel and improves suction efficiency.

[0034] The "powder material suction device for adapting to the upper opening storage barrel" is in the initial state before performing the suction operation. In the initial state: Ⅰ. The straw mechanism is moved to the highest position of its lifting stroke through the vertical lifting action of the third drive mechanism; Ⅱ. The upper end of the inner tube is connected to an external negative pressure source.

[0035] S01, hoisting the upper opening storage barrel: A. Control the first drive mechanisms in all the barrel support devices simultaneously or in no particular order, so that all the rotary platforms move to an operating range that is offset from the straw device (i.e., the rotary platforms are not directly aligned with the straw device), thereby facilitating the subsequent lifting of the upper open storage barrel; B. First open the upper cover of the upper-opening storage barrel, and then use a crane to lift the upper-opening storage barrel filled with powder material and place it in the barrel positioning area 221 of the rotary platform. During the lifting and placement process, the lower end outer wall of the upper-opening storage barrel rolls in contact with all the guide wheels 222, so that all the guide wheels 222 jointly correct the deviation and center the barrel, and then the upper-opening storage barrel finally falls at the center of the barrel positioning area 221.

[0036] In this step, step B is repeated to hoist and place an upper-opening material storage barrel in the barrel positioning area 221 of each set of barrel support devices.

[0037] S02, upper and lower alignment adjustment: A. The first drive mechanism in the target barrel support device is actuated to move the corresponding rotary platform and the target upper-opening storage barrel carried thereon into the operating range of the straw device (i.e., the vertical downward projection of the path swept by the straw device along the horizontal straight line); B. The second driving mechanism is activated to move the straw device to the position directly above the opening of the target upper-opening storage barrel (ie, the axis of the inner tube coincides with the center line of the opening of the upper-opening storage barrel).

[0038] S03, negative pressure suction operation: like Figure 5-6 As shown, the third driving mechanism is activated to lower the straw device. When the lower end of the straw device enters the opening of the target upper opening storage barrel, the powder material suction operation is started. The suction operation includes the "centering suction stage" and the "deflected suction stage" that follow one after another.

[0039] The "Centered Suction Phase" operates as follows: A. Perform the following two tasks simultaneously: ①. The external negative pressure source is activated, so that the powder material in the inner cavity of the upper opening storage barrel enters the annular column interlayer 45 through the feed port 421 of the outer tube 4 under the action of negative pressure, and then enters the inner hole of the inner tube 41 through the feed hole 412 of the inner tube 41, flows along the airflow in the inner hole of the inner tube 41 to the upper end of the inner tube 41, and finally discharged from the upper port of the inner tube 41; ② The third drive mechanism operates, causing the suction device to descend at a speed that matches the amount of powder material being aspirated (i.e., as the powder material is continuously aspirated, the upper surface of the powder material in the reduced diameter section of the upper-opening storage barrel also continuously descends, and the descending speed of the suction device matches the descending speed of the upper surface of the powder material); B. When all the material gathering plates at the lower end of the suction pipe device enter the straight section from the reduced diameter section of the upper opening storage barrel, the "center suction stage" ends.

[0040] The "deflection suction phase" operates as follows: A. The second drive mechanism is activated to move the straw device radially outward from the inner cavity of the target upper-opening storage barrel until the minimum cylinder that can accommodate all the gathering plates is less than 10 mm from the inner wall of the straight section of the upper-opening storage barrel, and the straw device stops moving. At this time, the straw device is arranged eccentrically. B. Perform the following three tasks simultaneously: ①. The rotary platform starts, driving the target upper opening storage barrel placed on it to rotate; ② The third drive mechanism operates, causing the suction device to descend at a speed that matches the amount of powder material being aspirated (i.e., as the powder material is continuously aspirated, the upper surface of the powder material in the reduced diameter section of the upper-opening storage barrel also continuously descends, and the descending speed of the suction device matches the descending speed of the upper surface of the powder material); ③. The external negative pressure source is activated, so that the powder material in the inner cavity of the upper opening storage barrel enters the annular column interlayer 45 through the feed port 421 of the outer tube 4 under the action of negative pressure, and then enters the inner hole of the inner tube 41 through the feed hole 412 of the inner tube 41. It flows along the airflow in the inner hole of the inner tube 41 toward the upper end of the inner tube 41 and is finally discharged from the upper end of the inner tube 41; The three items in this step are executed simultaneously, so that the powder material at the inner cavity wall of the upper opening storage barrel is pushed by the gathering plate and moves toward the direction close to the outer tube feed port, so as to improve the suction effect of the powder material at the inner cavity wall of the upper opening storage barrel; and the suction straw device forms a spiral downward motion trajectory in the reduced diameter section of the inner cavity of the upper opening storage barrel, thereby achieving uniform and residue-free suction of the powder material.

Claims

1. A double-layer powder feeding straw for use with a top-opening storage barrel. The top-opening storage barrel comprises a barrel body with an opening at the center of the upper end and an upper cover mounted on the opening. The barrel body has a straight lower section and a reduced diameter upper section, so that the opening of the barrel body is smaller than the cross-sectional dimension of the straight section of the barrel body. Its characteristics are: A double-layer straw for powder material adapted for an upper open storage barrel comprises a double-layer tube and a material gathering plate; the double-layer tube comprises an outer tube and an inner tube coaxially and centrally arranged in the inner hole of the outer tube, a ring column area is formed between the inner tube and the outer tube, the inner tube and the outer tube are fixedly connected as one at the lower end face by a ring plate, the upper end of the inner tube extends from the upper end port of the outer tube, the upper end of the inner tube is provided with a plurality of connecting holes for connecting to the atmosphere, and the lower end of the inner tube is provided with a plurality of feed holes; a plurality of material gathering plates are evenly distributed in a ring shape and fixedly connected to the outer cylindrical surface of the lower end of the outer tube; a feed port is provided on the outer cylindrical surface of the lower end of the outer tube between any two adjacent material gathering plates.

2. The double-layered straw for powder materials adapted for use with an upper opening storage barrel as claimed in claim 1, characterized in that: One end of the material gathering plate is connected to the outer circumferential surface of the lower end of the outer tube, and the other end extends radially outward of the outer tube; the material gathering plate is arranged obliquely relative to the axis of the outer tube.

3. The double-layered straw for powder materials adapted for use with an upper opening storage barrel as claimed in claim 2, characterized in that: The inner tube is provided with multiple groups of feed holes along the axial direction of the inner tube, and each group includes multiple feed holes that surround the inner tube and are evenly distributed in a ring shape; the cross-sectional area of a single feed hole is 5%-15% of the cross-sectional area of a single feed port.

4. The double-layered straw for powder materials adapted for use with an upper opening storage barrel as claimed in claim 3, characterized in that: All the aggregate plates are connected into a whole through a reinforcement ring. The reinforcement ring is a rigid component and is connected to the radial outer edges of all the aggregate plates.

5. A method for extracting powder material from a material storage barrel with an upper opening, based on the "double-layered powder material suction tube adapted for a material storage barrel with an upper opening" according to claim 4; characterized in that: "Double-layer powder material suction tube for upper-opening storage barrels" belongs to the category of "powder material suction device for upper-opening storage barrels"; A powder material suction device adapted for a top-opening storage barrel includes, in addition to a "double-layer powder material suction pipe adapted for the top-opening storage barrel," a barrel support device and a suction pipe moving device; The barrel support device includes a base and a rotating platform movably mounted on the upper end of the base, a barrel positioning area is provided on the upper end of the rotating platform, and a first driving mechanism for driving the rotating platform to move horizontally and linearly on the base is provided between the base and the rotating platform; The straw moving device includes a support frame, a second drive mechanism, and a third drive mechanism; the support frame is fixedly mounted on the base; the second drive mechanism is mounted on the upper end of the support frame and is provided with an actuator A for horizontal linear movement; the third drive mechanism is mounted on actuator A and is provided with an actuator B for vertical lifting movement; The connection between the "double-layer powder material suction tube adapted for the upper-opening storage barrel" and the suction tube moving device is as follows: the upper end of the inner tube is directly or indirectly fixedly connected to the actuator B; the suction tube device is driven by the second drive mechanism to move horizontally and linearly, so that its vertical downward projection area is aligned with or avoids the barrel positioning area of the rotating platform; The straw device is driven by the third driving mechanism to move vertically up and down, thereby extending into or out of the barrel through the upper opening of the barrel; Before executing the method, the "powder material suction device for adapting to the upper-opening storage barrel" is in an initial state. In the initial state, the suction tube mechanism is moved to the highest position of its lifting stroke by the vertical lifting action of the third driving mechanism; the upper end of the inner tube is connected to the external negative pressure source; Based on the above initial state, the method process is as follows: S01, hoisting the open storage barrel; S02, up and down alignment adjustment; S03, negative pressure suction operation: The third driving mechanism is activated to lower the suction device. When the lower end of the suction device enters the opening of the target upper-opening material storage barrel, the powder material suction operation is started. The suction operation includes the "centering suction stage" and the "deflected suction stage" in sequence. The "Center Suction Phase" operates as follows: A. Perform the following two tasks simultaneously: ①. The external negative pressure source is activated, so that the powder material in the inner cavity of the upper opening storage barrel enters the annular column interlayer through the feed port of the outer tube under the action of negative pressure, and then enters the inner hole of the inner tube through the feed hole of the inner tube. It flows along the airflow in the inner hole of the inner tube to the upper end of the inner tube and is finally discharged from the upper port of the inner tube; ② The third drive mechanism is activated, causing the suction device to descend at a speed that matches the amount of powder material sucked; B. When all the material collecting plates at the lower end of the suction pipe device enter the straight section from the reduced diameter section of the upper opening storage barrel, the "center suction stage" ends; The "Deflection Suction Phase" operates as follows: A. The second drive mechanism is activated to move the straw device radially outward from the inner cavity of the target upper-opening storage barrel until the minimum cylinder that can accommodate all the gathering plates is less than 10 mm from the inner wall of the straight section of the upper-opening storage barrel, and the straw device stops moving. At this time, the straw device is arranged eccentrically. B. Perform the following three tasks simultaneously: ①. The rotary platform starts, driving the target upper opening storage barrel placed on it to rotate; ② The third drive mechanism is activated, causing the suction device to descend at a speed that matches the amount of powder material sucked; ③. The external negative pressure source is activated, causing the powder material in the inner cavity of the upper opening storage barrel to enter the annular column interlayer through the feed port of the outer tube under the action of negative pressure, and then enter the inner hole of the inner tube through the feed hole of the inner tube. It flows along the airflow in the inner hole of the inner tube to the upper end of the inner tube and is finally discharged from the upper end of the inner tube; The three items in this step are executed simultaneously, so that the powder material at the inner cavity wall of the upper opening storage barrel is pushed by the gathering plate and moves toward the direction close to the outer tube feed port, so as to improve the suction effect of the powder material at the inner cavity wall of the upper opening storage barrel; and the suction straw device forms a spiral downward motion trajectory in the reduced diameter section of the inner cavity of the upper opening storage barrel, thereby achieving uniform and residue-free suction of the powder material.

6. The powder material suction method adapted for an upper opening storage barrel as claimed in claim 5, characterized in that: The detailed process of step S01 is as follows: A. Control the first drive mechanisms in all the barrel support devices simultaneously or in no particular order, so that all the rotary platforms move to the operating range of the staggered straw devices, thereby facilitating the subsequent lifting of the upper open storage barrel; B. First, open the upper cover of the upper-opening storage barrel, and then use a crane to lift the upper-opening storage barrel filled with powder material into the barrel positioning area of the rotary platform. During the lifting and placement process, the lower end outer wall of the upper-opening storage barrel rolls with all the guide wheels, thereby being corrected and centered by all the guide wheels, and finally the upper-opening storage barrel falls in the center of the barrel positioning area; In this step, repeat step B and hoist and place an upper-opening storage barrel in the barrel positioning area of each barrel support device.

7. The powder material suction method adapted for an upper opening storage barrel according to claim 6, characterized in that: The detailed process of step S02 is as follows: A. The first driving mechanism in the target barrel support device is actuated to move the corresponding rotary platform and the target upper-opening storage barrel carried thereon into the operating range of the straw device; B. The second driving mechanism is activated to move the straw device to the position directly above the opening of the target upper opening storage barrel.

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