Powder dosing device

Abstract

The application discloses a kind of powder ration feeding equipment, including feeding pipe, material moving assembly and arch breaking and purging mechanism.Feeding pipe is equipped with axial misalignment inlet and outlet, material moving assembly can reciprocate in feeding pipe, it is equipped with at least one along vertical to the axial through setting material moving channel;Arch breaking and purging mechanism includes with each material moving channel communication gas transmission passage.Material moving assembly is in first position, each material moving channel is communicated with inlet and is misaligned with outlet, and arch breaking and purging mechanism blows gas to material moving channel through gas transmission passage;Material moving assembly is in second position, each material moving channel is misaligned with inlet and is communicated with outlet, and arch breaking and purging mechanism blows gas to material moving channel through gas transmission passage.The technical scheme is through the constant-volume characteristics of material moving channel, combined with the gas auxiliary action of arch breaking and purging mechanism, effectively avoids the deviation of feeding amount caused by powder bridging and residual, improves the precision and stability of powder ration feeding.

Description

Technical Field

[0001] This application relates to the field of powder conveying technology, and in particular to a powder quantitative feeding device. Background Technology

[0002] Traditional powder feeding equipment often uses screw feeders. Their basic working principle involves rotating screw blades propelling the powder forward within a closed trough, with the discharge rate controlled by the screw's rotational speed and filling rate. However, in screw feeders, the powder is easily subjected to bridging and clogging at the inlet or between the screw blades due to compression, friction, and interparticle cohesion. This results in the powder not falling evenly and continuously, leading to a significant deviation between the actual discharge rate and the actual feed rate. Summary of the Invention

[0003] This invention proposes a powder quantitative feeding device, which aims to solve the problem that the actual output amount and the set feed amount are greatly deviated due to bridging and blockage caused by powder extrusion and friction in traditional screw feeders, thereby improving the quantitative accuracy of powder feeding.

[0004] A powder metering feeding device according to an embodiment of this application includes a feeding pipe, a material transfer assembly, and an arch-breaking and purging mechanism. The feeding pipe has a feeding cavity and is provided with an inlet and an outlet communicating with the feeding cavity. The inlet and the outlet are offset along the axial direction of the feeding pipe. The material transfer assembly is configured to reciprocate axially within the feeding cavity and is provided with at least one material transfer channel, which is axially perpendicular to the feeding pipe. The arch-breaking and purging mechanism includes an air supply passage, which communicates with each of the material transfer channels. The material transfer assembly has a first position and a second position. When the material transfer assembly is in the first position, each of the material transfer channels is connected to the inlet and misaligned with the outlet, and the arch-breaking and purging mechanism blows air into the material transfer channel through the air supply passage. When the material transfer assembly is in the second position, each of the material transfer channels is misaligned with the inlet and connected to the outlet, and the arch-breaking and purging mechanism blows air into the material transfer channel through the air supply passage.

[0005] The powder quantitative feeding device according to the embodiments of this application has at least the following beneficial effects: This powder quantitative feeding device, by setting a transfer component that can reciprocate within the feeding pipe cavity, utilizes the fixed volume of the transfer channel to achieve quantitative transport of powder. Simultaneously, when the transfer component is in the first position, an anti-bridging and purging mechanism blows air into the transfer channel through the air supply passage to break up the powder in the inlet, ensuring that the transfer channel is fully filled with powder. When the transfer component is in the second position, the anti-bridging and purging mechanism again blows air into the transfer channel through the air supply passage to purge the powder within the transfer channel, ensuring that no powder residue remains in the transfer channel. Through the fixed volume characteristic of the transfer channel, combined with the gas-assisted action of the anti-bridging and purging mechanism, the feeding deviation caused by powder bridging and residue is effectively avoided, improving the accuracy and stability of powder quantitative feeding.

[0006] According to some embodiments of this application, the powder metering feeding device further includes a driving mechanism, which includes a protective cover, a driving component, and a transmission shaft. The protective cover is disposed outside the feeding pipe cavity, the driving component is disposed inside the protective cover, and the transmission shaft extends axially along the feeding pipe. One end of the transmission shaft is inserted into the feeding pipe cavity and connected to the material transfer assembly, and the other end of the transmission shaft is inserted into the protective cover and connected to the driving component. The transmission shaft drives the material transfer assembly to reciprocate under the drive of the driving component.

[0007] According to some embodiments of this application, the arch-breaking and purging mechanism further includes a controller, a control valve, and a stroke sensing component. The control valve is connected to the air supply passage, and the stroke sensing component is at least partially connected to the drive shaft. The control valve and the stroke sensing component are electrically connected to the controller. The stroke sensing component is used to detect whether the material transfer component is in the first position or the second position. When the stroke sensing component detects that the material transfer component is in the first position, the controller controls the control valve to open; when the stroke sensing component detects that the material transfer component is in the second position, the controller controls the control valve to open.

[0008] According to some embodiments of this application, the travel sensing component includes a first trigger component and a second trigger component. The first trigger component includes a first stationary contact switch and a first movable contact switch. The first stationary contact switch is connected to the protective cover, and the first movable contact switch is connected to the drive shaft and disposed opposite to the first stationary contact switch. The second trigger component includes a second stationary contact switch and a second movable contact switch. The second stationary contact switch is connected to the protective cover, and the second movable contact switch is connected to the drive shaft and disposed opposite to the second stationary contact switch. The second movable contact switch and the first movable contact switch are spaced apart along the axial direction of the drive shaft. The first stationary contact switch and the second stationary contact switch are electrically connected to the controller. When the material transfer component moves to the first position, the first stationary contact switch contacts the first movable contact switch, and the controller receives a trigger signal from the first stationary contact switch to control the control valve to open. When the material transfer component moves to the second position, the second stationary contact switch contacts the second movable contact switch, and the controller receives a trigger signal from the second stationary contact switch to control the control valve to open.

[0009] According to some embodiments of this application, the material transfer assembly includes a first end assembly and a second end assembly. The second end assembly is connected to the side of the first end assembly facing the drive shaft. The material transfer channel is disposed in the first end assembly. The drive shaft is inserted into the feeding tube and connected to the second end assembly. When the material transfer assembly is in the second position, the first end assembly is positioned opposite the discharge port, and the second end assembly is at least partially positioned opposite the inlet and blocks the discharge port.

[0010] According to some embodiments of this application, the first end assembly includes a transfer tube and a sealing diaphragm. The transfer tube is movably disposed within the feeding tube cavity, and the axial direction of the transfer tube is perpendicular to the axial direction of the feeding pipe. The hollow channel of the transfer tube serves as the transfer channel. The sealing diaphragm is disposed on both sides of the transfer tube along the axial direction of the transfer tube, and the two ends of the sealing diaphragm are in contact with and sealed to the inner wall surface of the feeding pipe.

[0011] According to some embodiments of this application, the second end assembly includes a first connecting plate, a second connecting plate, and a baffle plate. The first connecting plate and the second connecting plate are arranged at intervals along the axial direction of the feeding pipe. The first connecting plate is connected to the side of the first end assembly facing the drive shaft. The baffle plate is connected between the first connecting plate and the second connecting plate, and the baffle plate slides in contact with the inner wall surface of the feeding pipe. The size of the baffle plate is larger than the size of the feed inlet. The drive shaft is inserted into the feeding pipe cavity and is connected to the second connecting plate.

[0012] According to some embodiments of this application, the gas supply passage includes a first gas passage, a second gas passage, and a third gas passage. The first gas passage is located at the first end assembly and communicates with the material transfer channel. The third gas passage is partially located at the drive shaft and is used to communicate with a gas source. The second gas passage is located at the second end assembly, and the two ends of the second gas passage are respectively connected to the first gas passage and the third gas passage. The control valve is connected to the third gas passage.

[0013] According to some embodiments of this application, the first air passage includes an internal air delivery section and an external air delivery section. The internal air delivery section includes a main air delivery path and a branch air delivery path. The main air delivery path is disposed on the side wall of the material transfer channel and extends axially along the feeding pipe. The branch air delivery path is disposed on the side wall of the material transfer channel and is perpendicular to the main air delivery path. The two ends of the branch air delivery path are respectively connected to the main air delivery path and the material transfer channel. The external air delivery section is disposed outside the first end assembly, and the two ends of the external air delivery section are respectively connected to the internal air delivery section and the second air passage.

[0014] According to some embodiments of this application, the feeding pipe includes a pipe body, a first end plate and a second end plate, the feeding cavity is formed in the pipe body, the inlet and the outlet are disposed on the side wall of the pipe body, the pipe body has a first end and a second end opposite to each other, the first end plate is fixedly connected to the first end to block the first end, the second end plate is detachably connected to the second end, and the drive shaft passes through the second end plate and is connected to the material transfer assembly.

[0015] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0017] Figure 1 This is a side view of a powder metering feeding device according to an embodiment of this application; Figure 2 This is a schematic diagram of the structure of a powder metering feeding device according to an embodiment of the present application, showing the material transfer component in the first position; Figure 3 for Figure 2 A magnified view of a portion of the image; Figure 4 for Figure 2 Another enlarged view of a portion; Figure 5 This is a schematic diagram of the structure of a powder quantitative feeding device according to an embodiment of the present application, showing the material transfer component in the second position; Figure 6 for Figure 5 A magnified view of a portion of the image; Figure 7 for Figure 5 Another enlarged view of a portion; Figure 8 This is a cross-sectional view of the material transfer component in a powder quantitative feeding device according to an embodiment of this application.

[0018] Explanation of icon numbers: 100. Powder metering feeder; 10. Feeding pipe; 11. Pipe body; 111. Feeding cavity; 112. Inlet; 113. Outlet; 12. First end plate; 13. Second end plate; 20. Transfer assembly; 21. First end assembly; 211. Transfer pipe; 2111. Transfer channel; 212. Sealing diaphragm; 22. Second end assembly; 221. First connecting plate; 222. Second connecting plate; 223. Baffle plate; 31. Air supply passage; 311. First air passage; 3111. Internal air supply section; 3111a. Main air supply passage; 311 1b. Gas supply branch; 3112. External gas supply section; 312. Second gas passage; 313. Third gas passage; 32. Control valve; 33. First trigger assembly; 331. First stationary contact switch; 332. First moving contact switch; 34. Second trigger assembly; 341. Second stationary contact switch; 342. Second moving contact switch; 40. Drive mechanism; 41. Protective cover; 42. Drive component; 43. Transmission shaft; 50. Feed bin; 51. First straight section; 52. First diameter changing section; 60. Discharge bin; 61. Second straight section; 62. Second diameter changing section; 70. Gas source.

[0019] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0020] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0021] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application. Furthermore, features defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0022] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" 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; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0023] Traditional powder feeding equipment often uses screw feeders. Their basic working principle involves rotating screw blades propelling the powder forward within a closed trough, with the discharge rate controlled by the screw's rotational speed and filling rate. However, in screw feeders, the powder is easily subjected to bridging and clogging at the inlet or between the screw blades due to compression, friction, and interparticle cohesion. This results in the powder not falling evenly and continuously, leading to a significant deviation between the actual discharge rate and the actual feed rate.

[0024] Based on the above-mentioned technical problems, this application proposes a powder quantitative feeding device.

[0025] Reference Figures 1 to 8 The powder quantitative feeding device 100 includes a feeding pipe 10, a material transfer assembly 20, and an arch-breaking and purging mechanism. The feeding pipe 10 has a feeding cavity 111, and the feeding pipe 10 is provided with an inlet 112 and an outlet 113 connected to the feeding cavity 111. The inlet 112 and the outlet 113 are offset along the axial direction of the feeding pipe 10. The material transfer assembly 20 is configured to reciprocate along the axial direction within the feeding cavity 111. The material transfer assembly 20 is provided with at least one material transfer channel 2111, which is arranged through the material transfer channel 2111 along an axial direction perpendicular to the feeding pipe 10. The arch-breaking and purging mechanism includes an air supply passage 31, which is connected to each material transfer channel 2111.

[0026] The feeding cavity 111 extends axially along the feeding pipe 10, providing space for the conveying of powder and the movement of the material transfer assembly 20. The feeding pipe 10 has an inlet 112 and an outlet 113, both of which are connected to the feeding cavity 111. The inlet 112 and outlet 113 are offset axially along the feeding pipe 10, located at different positions along the length of the feeding pipe 10, and are not directly opposite each other.

[0027] The powder metering feeding device 100 also includes a feed hopper 50 and a discharge hopper 60. The feed hopper 50 is connected to the feed inlet 112 of the feeding pipe 10 and is used to temporarily store the powder to be fed and to supply it to the feeding pipe cavity 111. Specifically, the feed hopper 50 includes a first straight cylindrical section 51 and a first variable diameter section 52. The first straight cylindrical section 51 has a uniform cross-section cylindrical structure. The first variable diameter section 52 is connected between the lower end of the first straight cylindrical section 51 and the feed inlet 112. The cross-sectional area of ​​the first variable diameter section 52 gradually decreases from top to bottom, that is, the first variable diameter section 52 has a conical or funnel-shaped structure with a larger upper section and a smaller lower section. The lower opening of the first variable diameter section 52 is connected to the feed inlet 112. The discharge hopper 60 is connected to the discharge outlet 113 of the feeding pipe 10 and is used to receive the metered powder discharged from the discharge outlet 113 and guide it to downstream equipment. Similarly, the discharge bin 60 includes a second variable diameter section 62 and a second straight cylindrical section 61. The cross-sectional area of ​​the second variable diameter section 62 gradually increases from top to bottom. That is, the second variable diameter section 62 has a conical or inverted funnel-shaped structure with a smaller top and a larger bottom. The upper opening of the second variable diameter section 62 is connected to the discharge port 113, and the lower opening of the second variable diameter section 62 is connected to the upper opening of the second straight cylindrical section 61.

[0028] A material transfer assembly 20 that can move axially is provided in the feeding pipe cavity 111, and the material transfer assembly 20 is provided with a material transfer channel 2111. The material transfer channel 2111 is arranged to pass through the feeding pipe 10 along an axial direction perpendicular to it. The material transfer channel 2111 is used to receive the powder falling from the feed port 112 and transport the powder to the discharge port 113 during the movement.

[0029] The powder metering feeder 100 also includes a drive mechanism 40, which is connected to the material transfer assembly 20 for driving the material transfer assembly 20 to reciprocate axially along the feeding pipe 10. (Refer to...) Figure 2In a specific application, the drive mechanism 40 may include a protective cover 41, a drive component 42, and a transmission shaft 43. The protective cover 41 is disposed outside the feeding pipe cavity 111, and the drive component 42 (which may be a cylinder, hydraulic cylinder, or motor screw assembly, etc.) is disposed inside the protective cover 41. The transmission shaft 43 extends axially along the feeding pipe 10. One end of the transmission shaft 43 is inserted into the feeding pipe cavity 111 and connected to the material transfer assembly 20, while the other end of the transmission shaft 43 is inserted into the protective cover 41 and connected to the drive component 42. Driven by the drive component 42, the transmission shaft 43 drives the material transfer assembly 20 to reciprocate, thereby achieving the switching between the first position and the second position. The protective cover 41 covers the drive component 42 to protect it and serves as the mounting base for the static contact switch described below.

[0030] The material transfer assembly 20 has two extreme working positions within the feeding tube 111: a first position and a second position. One reciprocating movement of the material transfer assembly 20 between the first and second positions completes one full quantitative feeding cycle.

[0031] However, during the reciprocating motion of the transfer assembly 20, the powder at the feed inlet 112 is prone to bridging due to compression and friction, resulting in the transfer channel 2111 not being completely filled with powder, affecting the quantitative accuracy. Simultaneously, the powder in the transfer channel 2111 is difficult to completely empty on its own under gravity, causing residue and feed rate reduction. To simultaneously solve the problems of poor feeding and incomplete discharge, this powder quantitative feeding device 100 also includes an anti-bridging and purging mechanism. Specifically, the anti-bridging and purging mechanism includes an air supply passage 31, one end of which is connected to each transfer channel 2111, and the other end is connected to an air source 70. The air source 70 can be an air pump or air tank storing compressed air. The air source 70 can be located inside the protective cover 41, and the air supply passage 31 extends out from inside the protective cover 41.

[0032] In practical applications, only one material transfer channel 2111 can be set up. This is to avoid the material transfer channel 2111 from being partially connected to the inlet 112 and the outlet 113 at the same time during the movement, which would cause material to be fed and discharged at the same time, resulting in loss of control over the feeding amount.

[0033] Alternatively, two or more transfer channels 2111 can be provided, arranged sequentially along the axial direction of the feeding pipe 10. Taking three transfer channels 2111 as an example, these three transfer channels 2111 are defined as the first transfer channel 2111, the second transfer channel 2111, and the third transfer channel 2111. In this case, the axial misalignment distance between the inlet 112 and the outlet 113 is also greater than the axial length of a single transfer channel 2111, ensuring that during the movement of the transfer assembly 20, the same transfer channel 2111 will not simultaneously connect with both the inlet 112 and the outlet 113.

[0034] During the movement of the material transfer assembly 20 from the first position to the second position, the communication states of each material transfer channel 2111 with the inlet 112 and the outlet 113 are switched sequentially. When the material transfer assembly 20 is in the first position, the first material transfer channel 2111, the second material transfer channel 2111, and the third material transfer channel 2111 are all directly connected to the inlet 112 and are all offset from the outlet 113. Under the action of gravity, the powder fills the three material transfer channels 2111 simultaneously.

[0035] As the material transfer component 20 moves toward the second position, the first material transfer channel 2111 first leaves the area of ​​the inlet 112 and moves to the misaligned area between the inlet 112 and the outlet 113. At this time, the first material transfer channel 2111 is not connected to either the inlet 112 or the outlet 113, and the powder inside is sealed in the channel. The second material transfer channel 2111 and the third material transfer channel 2111 remain connected to the inlet 112 and continue to receive the powder.

[0036] The material transfer assembly 20 continues to move, and the first material transfer channel 2111 reaches the area of ​​the discharge port 113 and connects with the discharge port 113. The powder stored inside is discharged from the discharge port 113 under the action of gravity. At the same time, the second material transfer channel 2111 moves to the misaligned area between the inlet 112 and the discharge port 113, while the third material transfer channel 2111 remains connected to the inlet 112.

[0037] The material transfer assembly 20 continues to move to the second position, and the first material transfer channel 2111 and the second material transfer channel 2111 are connected to the discharge port 113 in turn, and the powder in the corresponding channel is discharged from the discharge port 113 in sequence. The third material transfer channel 2111 then moves to the misaligned area between the inlet 112 and the outlet 113.

[0038] When the material transfer assembly 20 moves to the second position, the first material transfer channel 2111, the second material transfer channel 2111 and the third material transfer channel 2111 are all misaligned with the inlet 112 and are all connected to the outlet 113. The powder in the third material transfer channel 2111 is discharged from the outlet 113.

[0039] At this point, the powder in the three transfer channels 2111 is discharged from the outlet 113 in sequence as the transfer component 20 moves from the first position to the second position, completing a complete quantitative feeding cycle.

[0040] In short, regardless of whether the transfer channel 2111 is configured as a single channel or multiple channels, the transfer assembly 20 has two extreme working positions: a first position and a second position. When the transfer assembly 20 is in the first position, such as... Figure 2 and Figure 3 As shown, each material transfer channel 2111 is connected to the feed inlet 112 and offset from the discharge outlet 113. At this time, the powder falls from the feed inlet 112 into each material transfer channel 2111 under the action of gravity. During this process, the arch-breaking and purging mechanism blows air into the material transfer channel 2111 through the air supply passage 31. The gas flows towards the feed inlet 112 and applies an impact force to the powder at the feed inlet 112 to break the bridging structure formed between the powder particles due to compression, friction and cohesion, so that the powder at the feed inlet 112 can regain its fluidity and ensure that each material transfer channel 2111 can be fully filled with powder.

[0041] After each transfer channel 2111 is filled with powder, the transfer assembly 20 moves from the first position to the second position under the drive of the drive mechanism 40. During the movement, the powder in the transfer channel 2111 moves together with the transfer assembly 20 and is enclosed within the transfer channel 2111, preventing leakage into the feeding pipe 111. When the transfer assembly 20 moves to the second position, as... Figure 5 and Figure 6 As shown, each material transfer channel 2111 is misaligned with the inlet 112 and connected to the outlet 113. At this time, the arch-breaking and purging mechanism blows air into the material transfer channel 2111 again through the air supply passage 31. The gas flows towards the outlet 113, applying a purging force to the powder in the material transfer channel 2111, pushing the powder adhering to the inner wall of the material transfer channel 2111 and the powder remaining in the material transfer channel 2111 towards the outlet 113 and discharged, ensuring that there is no powder residue in the material transfer channel 2111.

[0042] In summary, this powder quantitative feeding device 100 utilizes a transfer component 20 that reciprocates within the feeding chamber 111 to achieve quantitative powder transport using the fixed volume of the transfer channel 2111. Simultaneously, when the transfer component 20 is in the first position, an anti-bridging and purging mechanism blows air into the transfer channel 2111 through the air supply passage 31 to break up the powder in the feed inlet 112, ensuring the transfer channel 2111 is fully filled with powder. When the transfer component 20 is in the second position, the anti-bridging and purging mechanism again blows air into the transfer channel 2111 through the air supply passage 31 to purge the powder within the transfer channel 2111, ensuring no powder residue remains. By leveraging the fixed volume characteristic of the transfer channel 2111, combined with the gas-assisted action of the anti-bridging and purging mechanism, feed deviations caused by powder bridging and residue are effectively avoided, improving the accuracy and stability of quantitative powder feeding.

[0043] In some embodiments, the arch-breaking and purging mechanism further includes a controller, a control valve 32, and a stroke sensing component. The control valve 32 is connected to the gas supply passage 31 and is used to control the opening and closing of the gas supply passage 31. When the control valve 32 receives an opening signal, it opens the gas supply passage 31, allowing gas to flow from the gas source 70 to the material transfer channel 2111; when the control valve 32 receives a closing signal, it cuts off the gas supply passage 31, stopping the gas supply. The stroke sensing component is at least partially connected to the drive shaft 43. The control valve 32 and the stroke sensing component are electrically connected to the controller. The stroke sensing component is used to detect whether the material transfer component 20 is in a first position or a second position. When the stroke sensing component detects that the material transfer component 20 is in the first position, the controller controls the control valve 32 to open; when the stroke sensing component detects that the material transfer component 20 is in the second position, the controller controls the control valve 32 to open.

[0044] Reference Figure 4 and Figure 7 In some embodiments, the travel sensing component includes a first trigger component 33 and a second trigger component 34. The first trigger component 33 includes a first stationary switch 331 and a first movable switch 332. The first stationary switch 331 is connected to the protective cover 41, and the first movable switch 332 is connected to the drive shaft 43 and is disposed opposite to the first stationary switch 331. The second trigger component 34 includes a second stationary switch 341 and a second movable switch 342. The second stationary switch 341 is connected to the protective cover 41, and the second movable switch 342 is connected to the drive shaft 43 and is disposed opposite to the second stationary switch 341. The second movable switch 342 and the first movable switch 332 are spaced apart along the axial direction of the drive shaft 43.

[0045] The first stationary contact switch 331 and the second stationary contact switch 341 are electrically connected to the controller. When the material transfer assembly 20 moves to the first position, the first stationary contact switch 331 contacts the first moving contact switch 332, and the controller receives the trigger signal from the first stationary contact switch 331, thereby controlling the control valve 32 to open. When the material transfer assembly 20 moves to the second position, the second stationary contact switch 341 contacts the second moving contact switch 342, and the controller receives the trigger signal from the second stationary contact switch 341, thereby controlling the control valve 32 to open.

[0046] The stationary and moving switches can be contact-type limit switches, a combination of Hall effect switches and magnetic components, or a combination of photoelectric switches and light-shielding plates. They only need to generate a corresponding trigger signal when the material transfer assembly 20 reaches the first or second position; no limitation is made here. In this embodiment, by setting a first trigger assembly 33 and a second trigger assembly 34, the reciprocating motion of the material transfer assembly 20 drives the moving switch to move. Thus, when the material transfer assembly 20 reaches the first or second position, the corresponding stationary and moving switches contact each other and generate a trigger signal. The controller automatically controls the control valve 32 to open based on this trigger signal, achieving linkage between the arch-breaking and purging mechanism and the position of the material transfer assembly 20. This ensures that gas is only injected when the material transfer assembly 20 is in the feeding and discharging positions, avoiding gas waste and guaranteeing the accurate execution of the arch-breaking and purging functions. This embodiment achieves self-starting of arch-breaking and purging without the need for additional position sensors or complex timing control logic.

[0047] It should be noted that when the material transfer assembly 20 is in the first position, the control valve 32 is opened only briefly. Brief opening means that the control valve 32 opens for a very short time (e.g., 0.5 to 2 seconds) after the material transfer assembly 20 reaches the first position, and then closes immediately. After the anti-bridging gas is injected into the material transfer channels 2111, the powder bridging structure is broken and its fluidity is restored. The powder naturally falls into the material transfer channels 2111 under gravity and fills each channel. If the control valve 32 remains open for a long time, the continuously injected gas will instead form an upward air cushion or airflow disturbance within the material transfer channels 2111, hindering the smooth descent of the powder and affecting the filling rate of the material transfer channels 2111. Therefore, brief opening only applies impact force at the moment of anti-bridging, and the gas supply stops after anti-bridging is completed, allowing the powder to fall freely under gravity without gas interference, ensuring that the material transfer channels 2111 are fully filled.

[0048] When the transfer assembly 20 is in the second position, the control valve 32 is in a long-term open state. Long-term open means that the control valve 32 remains open after the transfer assembly 20 reaches the second position until the powder in the transfer channel 2111 is completely emptied. Purge gas is continuously injected from the side wall of the transfer channel 2111, applying a continuous purging force to the powder in the channel, pushing the powder adhering to the inner wall of the channel and any remaining powder towards the outlet 113, ensuring complete discharge without residue. After the preset purging time has elapsed, the control valve 32 closes, and the drive mechanism 40 then controls the transfer assembly 20 to reset to the first position, or to an intermediate position between the first and second positions, to await the next feeding cycle. Long-term open ensures thorough purging, preventing powder accumulation and residue in the transfer channel 2111, thus ensuring accurate and consistent feeding amounts each time.

[0049] Reference Figure 3 In some embodiments, the material transfer assembly 20 includes a first end assembly 21 and a second end assembly 22. The second end assembly 22 is connected to the side of the first end assembly 21 facing the drive shaft 43. The material transfer channel 2111 is disposed in the first end assembly 21. The drive shaft 43 is inserted into the feeding tube 111 and connected to the second end assembly 22. When the material transfer assembly 20 is in the second position, the first end assembly 21 is positioned opposite the discharge port 113, and the second end assembly 22 is at least partially opposite the inlet 112 and blocks the discharge port 113.

[0050] The transfer channel 2111 is located at the first end component 21, which performs the quantitative transport function of the powder. The first end component 21 and the second end component 22 can be fixedly connected by bolts, clips, or welding. When the transfer component 20 is in the second position, the first end component 21 is directly opposite the discharge port 113, that is, the first end component 21 is exactly above the discharge port 113. At this time, the transfer channel 2111 in the first end component 21 is connected to the discharge port 113, and the powder in the transfer channel 2111 can be smoothly discharged from the discharge port 113 under the combined action of gravity and purging gas. At the same time, the second end component 22 is at least partially opposite the inlet 112, that is, the second end component 22 blocks the bottom of the inlet 112, and the second end component 22 blocks the discharge port 113, so that the discharge port 113 and the feeding tube 111 are separated by the second end component 22, and the powder cannot be discharged from the discharge port 113. The first end component 21 ensures the quantitative transport and smooth discharge of powder, while the second end component 22 ensures the reliable sealing of the inlet 112 during the discharge process, preventing the powder from continuing to fall and block the feeding tube 111 during the discharge stage.

[0051] Continue to refer to Figure 3The first end component 21 may include a transfer tube 211 and a sealing diaphragm 212. The transfer tube 211 is movably disposed in the feeding tube cavity 111. The axial direction of the transfer tube 211 is perpendicular to the axial direction of the feeding pipe 10. The hollow channel of the transfer tube 211 serves as the transfer channel 2111. The sealing diaphragm 212 is disposed on both sides of the transfer tube 211 along the axial direction of the transfer tube 211. The two ends of the sealing diaphragm 212 are in contact with and sealed to the inner wall surface of the feeding pipe 10.

[0052] A sealing diaphragm 212 is disposed on both sides of the transfer tube 211 along the axial direction of the transfer tube 211 to seal the gap between the transfer tube 211 and the inner wall of the feeding pipe 10. The sealing diaphragm 212 can be made of flexible elastic materials such as rubber, silicone, or polyurethane, possessing appropriate elasticity and wear resistance. The sealing diaphragm 212 can be fixedly connected to the outer wall of the transfer tube 211 by means of bolting, bonding, or vulcanization. When the transfer tube 211 reciprocates within the feeding pipe cavity 111, the sealing diaphragm 212 moves together with the transfer tube 211, and both ends of the sealing diaphragm 212 always remain in contact with the inner wall of the feeding pipe 10, thereby achieving dynamic sealing. In this embodiment, the first end component 21 is provided with a transfer tube 211 and a sealing diaphragm 212. The hollow channel of the transfer tube 211 serves as the transfer channel 2111 to quantitatively contain the powder. The sealing diaphragm 212 is arranged on both sides of the transfer tube 211 along the axial direction and is in contact with the inner wall of the feeding pipe 10 to seal it. This effectively prevents the powder from leaking from the gap between the outer wall of the transfer tube 211 and the inner wall of the feeding pipe 10 to other areas of the feeding pipe cavity 111, ensuring that the powder is always confined within the transfer channel 2111 during the entire conveying process, and avoiding the loss of feed volume caused by powder leakage.

[0053] Reference Figure 6 The second end assembly 22 may include a first connecting plate 221, a second connecting plate 222, and a baffle plate 223. The first connecting plate 221 and the second connecting plate 222 are arranged at intervals along the axial direction of the feeding pipe 10. The first connecting plate 221 is connected to the side of the first end assembly 21 facing the drive shaft 43. The baffle plate 223 is connected between the first connecting plate 221 and the second connecting plate 222, and the baffle plate 223 slides in contact with the inner wall surface of the feeding pipe 10. The size of the baffle plate 223 is larger than the size of the inlet 112. The drive shaft 43 is inserted into the feeding pipe cavity 111 and is connected to the second connecting plate 222.

[0054] The connection between the first connecting plate 221 and the first end assembly 21 can be achieved by bolting, screwing, or bonding. The first connecting plate 221 and the second connecting plate 222 are arranged axially along the feeding pipe 10, forming a certain gap between them. A baffle plate 223 is connected between the first connecting plate 221 and the second connecting plate 222, meaning that both ends of the baffle plate 223 are fixedly connected to the first connecting plate 221 and the second connecting plate 222, respectively. The outer surface of the baffle plate 223 contacts and slides against the inner wall of the feeding pipe 10, maintaining surface contact and relative sliding capability. The size of the baffle plate 223 is larger than the size of the outlet 113; specifically, the width and length of the baffle plate 223 are both larger than the opening size of the outlet 113, allowing the baffle plate 223 to completely cover the outlet 113, forming a reliable seal. The second connecting plate 222 is provided with an insertion interface, into which the drive shaft 43 is inserted and fixedly connected to the second connecting plate 222.

[0055] In this embodiment, the first connecting plate 221 ensures the fixed connection between the second end component 22 and the first end component 21, enabling them to move synchronously; the second connecting plate 222 is fixedly connected to the drive shaft 43, realizing the reliable transmission of driving force; the baffle plate 223 slides in contact with the inner wall of the feeding pipe 10, and its size is larger than that of the outlet 113, which can ensure that when the material transfer component 20 is in the second position, the baffle plate 223 forms a reliable shield and blockage of the outlet 113, preventing the powder from continuing to fall and block the feeding pipe cavity 111 during the discharge stage.

[0056] Reference Figure 8 In some embodiments, the gas supply passage 31 includes a first gas passage 311, a second gas passage 312, and a third gas passage 313. The first gas passage 311 is located on the first end assembly 21 and is connected to the material transfer channel 2111. The third gas passage 313 is partially located on the drive shaft 43 and is used to connect to the gas source 70. The second gas passage 312 is located on the second end assembly 22, and the two ends of the second gas passage 312 are respectively connected to the first gas passage 311 and the third gas passage 313. The control valve 32 is connected to the third gas passage 313.

[0057] The first air passage 311, the second air passage 312, and the third air passage 313 are connected in series to form a complete gas delivery path from the air source 70 to the transfer channel 2111. Specifically, the sidewall of the transfer tube 211 has a certain thickness. The first air passage 311 is located on the sidewall of the transfer tube 211, and its specific form can be a channel formed in the sidewall of the transfer tube 211, or a pipe embedded in the sidewall of the transfer tube 211. The location of the first air passage 311 on the sidewall of the transfer tube 211 avoids it occupying space in the transfer channel 2111, ensuring that the transfer channel 2111 has a complete volume to accommodate the powder and does not affect the quantitative accuracy of the transfer channel 2111. The second air passage 312 is located at the second end assembly 22 and is used to connect the first air passage 311 and the third air passage 313. The second air passage 312 can be an external flexible hose, one end of which is connected to the air inlet connector of the first air passage 311, and the other end is connected to the air outlet connector of the third air passage 313. Because the hose has a certain degree of flexibility and bending ability, it can adapt to the small displacements and vibrations generated during the reciprocating motion of the material transfer assembly 20, ensuring the reliability of the air passage connection. The drive shaft 43 can be hollow, with an axially extending hollow channel inside. This hollow channel serves as part of the passage for the third air passage 313, thus eliminating the need for additional piping on the drive shaft 43. The control valve 32 is connected to the third air passage 313. When the control valve 32 receives an opening signal, it opens the third air passage 313, allowing the gas from the air source 70 to flow sequentially through the third air passage 313, the second air passage 312, and the first air passage 311, ultimately being injected into the material transfer channel 2111. When the control valve 32 receives a closing signal, it cuts off the third air passage 313, stopping the air supply.

[0058] The air source 70 can be set inside the protective cover 41, and the third air passage 313 is led out from inside the protective cover 41. The control valve 32 can be connected to the section of the third air passage 313 located inside the protective cover 41, so that the control valve 32 is physically protected by the protective cover 41 and is protected from external dust pollution and accidental collisions.

[0059] Further, the first air passage 311 includes an internal air conveying section 3111 and an external air conveying section 3112. The internal air conveying section 3111 includes a main air conveying section 3111a and a branch air conveying section 3111b. The main air conveying section 3111a is disposed on the side wall of the material transfer channel 2111 and extends axially along the feeding pipe 10. The branch air conveying section 3111b is disposed on the side wall of the material transfer channel 2111 and is perpendicular to the main air conveying section 3111a. The two ends of the branch air conveying section 3111b are respectively connected to the main air conveying section 3111a and the material transfer channel 2111. The external air conveying section 3112 is disposed outside the first end assembly 21. The two ends of the external air conveying section 3112 are respectively connected to the internal air conveying section 3111 and the second air passage 312.

[0060] After the gas flows in from the main gas conveying channel 3111a, it turns 90° through the branch gas conveying channel 3111b and is vertically injected into the interior of the material transfer channel 2111 from the side wall. This vertical injection method allows the gas to directly impact the powder in the material transfer channel 2111, resulting in better purging and stronger arch breaking effect.

[0061] Multiple gas transmission branches 3111b can be set along the extension direction of the main gas transmission line 3111a. The multiple gas transmission branches 3111b are arranged at intervals along the axial direction of the material transfer channel 2111, so that air is sprayed at multiple axial positions in the material transfer channel 2111 at the same time, thereby improving the coverage and uniformity of the purging.

[0062] Furthermore, there may be two main gas supply lines 3111a, defined as a first main gas supply line 3111a and a second main gas supply line 3111a, which are respectively arranged opposite to each other on both sides of the material transfer channel 2111. Each material transfer channel 2111 is connected to at least two branch gas supply lines 3111b. In each material transfer channel 2111, at least one branch gas supply line 3111b is connected to the first main gas supply line 3111a, and at least one branch gas supply line 3111b is connected to the second main gas supply line 3111a.

[0063] The material transfer channel 2111 has a circular or rectangular cross-section. A first main air supply channel 3111a is located in one side wall of the material transfer channel 2111, and a second main air supply channel 3111a is located in the opposite side wall of the material transfer channel 2111. The two are arranged opposite each other, separated by a hollow area of ​​the material transfer channel 2111. The two main air supply channels 3111a and 3111a can be interconnected at both ends, or they can be independently closed, simply by connecting to their respective corresponding air supply branches 3111b. The first and second main air supply channels 3111a can be connected to the second air passage 312 via their respective external air supply parts 3112, or simultaneously via a three-way connector. Each material transfer channel 2111 is connected to at least two air supply branches 3111b. Of these at least two gas delivery branches 3111b, at least one gas delivery branch 3111b is connected to the first main gas delivery route 3111a, and at least one gas delivery branch 3111b is connected to the second main gas delivery route 3111a. In other words, gas delivery branches 3111b are provided on both sides of the material transfer channel 2111, and gas can be injected simultaneously from both sides of the material transfer channel 2111.

[0064] In this embodiment, a first main gas supply path 3111a and a second main gas supply path 3111a are respectively set on opposite sides of the material transfer channel 2111. Each material transfer channel 2111 is connected to at least one branch gas supply path 3111b connected to the first main gas supply path 3111a and one branch gas supply path 3111b connected to the second main gas supply path 3111a, allowing gas to be injected simultaneously from both sides of the material transfer channel 2111. Simultaneous gas injection from both sides can create convection or vortex effects within the material transfer channel 2111, resulting in a stronger stripping and purging effect on the powder on the inner wall of the channel, improving the thoroughness of purging. At the same time, when used for arch breaking, the gas injected from both sides can simultaneously apply impact force to the powder at the feed inlet 112 from two directions, resulting in better arch breaking effect, especially suitable for powder materials with extremely poor flowability and easy bridging.

[0065] Reference Figure 3 The feeding pipe 10 includes a pipe body 11, a first end plate 12 and a second end plate 13. The feeding cavity 111 is formed in the pipe body 11. The pipe body 11 has a first end and a second end opposite to each other. The first end plate 12 is fixedly connected to the first end to block the first end. The second end plate 13 is detachably connected to the second end. The drive shaft 43 passes through the second end plate 13 and is connected to the material transfer assembly 20.

[0066] The pipe body 11 is the main part of the feeding pipe 10, and its interior is hollow to form a feeding cavity 111. Both ends of the pipe body 11 are open. A first end plate 12 is fixedly connected to the first end of the pipe body 11, thereby sealing the opening at the first end. A second end plate 13 is detachably connected to the second end of the pipe body 11, that is, the second end plate 13 and the pipe body 11 are detachably connected and can be fixed by bolts, clips, or quick clamps. A sealing gasket can be provided between the second end plate 13 and the pipe body 11 to ensure the airtightness of the connection and prevent powder leakage from the connection. A through hole is provided on the second end plate 13 for the drive shaft 43 to pass through. One end of the drive shaft 43 passes through the through hole and extends into the feeding cavity 111, and is fixedly connected to the material transfer assembly 20. A linear bearing or sliding bushing can be provided between the drive shaft 43 and the second end plate 13 to reduce the frictional resistance of the drive shaft 43 during reciprocating motion and to ensure the linearity of the drive shaft 43's movement. A seal may also be provided between the drive shaft 43 and the second end plate 13 to prevent powder in the feeding chamber 111 from leaking to the outside through the gap between the drive shaft 43 and the second end plate 13. The second end plate 13 is detachably connected to the second end of the pipe body 11, allowing the operator to easily remove the second end plate 13 from the pipe body 11, thereby opening the second end opening of the pipe body 11 to install, disassemble, inspect, or replace the material transfer assembly 20 inside the feeding chamber 111. At the same time, the second end plate 13 also guides and supports the drive shaft 43, ensuring the stability of the reciprocating motion of the drive shaft 43.

[0067] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

[0068] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0069] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A powder quantitative feeding device, characterized in that, include: A feeding pipe having a feeding cavity, the feeding pipe having an inlet and an outlet connected to the feeding cavity, the inlet and the outlet being offset along the axial direction of the feeding pipe; A material transfer assembly is configured to reciprocate axially within the feeding tube cavity, and the material transfer assembly is provided with at least one material transfer channel, which is arranged axially perpendicular to the feeding tube. An arch-breaking and purging mechanism, the arch-breaking and purging mechanism including an air supply passage, the air supply passage being connected to each of the material transfer channels; The material transfer assembly has a first position and a second position. When the material transfer assembly is in the first position, each of the material transfer channels is connected to the inlet and misaligned with the outlet, and the arch-breaking and purging mechanism blows air into the material transfer channel through the air supply passage. When the material transfer assembly is in the second position, each of the material transfer channels is misaligned with the inlet and connected to the outlet, and the arch-breaking and purging mechanism blows air into the material transfer channel through the air supply passage.

2. The powder quantitative feeding device according to claim 1, characterized in that, The powder metering feeding device further includes a drive mechanism, which comprises: A protective cover is disposed outside the feeding tube cavity; A driving component, wherein the driving component is disposed inside the protective cover; A drive shaft extends axially along the feeding pipe. One end of the drive shaft is inserted into the feeding pipe cavity and connected to the material transfer assembly. The other end of the drive shaft is inserted into the protective cover and connected to the driving component. The drive shaft drives the material transfer assembly to reciprocate under the drive of the driving component.

3. The powder quantitative feeding device according to claim 2, characterized in that, The arch-breaking and purging mechanism further includes a controller, a control valve, and a stroke sensing component. The control valve is connected to the air supply passage, and the stroke sensing component is at least partially connected to the drive shaft. The control valve and the stroke sensing component are electrically connected to the controller, and the stroke sensing component is used to detect whether the material transfer component is in the first position or the second position. When the stroke sensing component detects that the material transfer component is in the first position, the controller controls the control valve to open; When the stroke sensing component detects that the material transfer component is in the second position, the controller controls the control valve to open.

4. The powder quantitative feeding device according to claim 3, characterized in that, The travel sensing component includes: A first triggering component, comprising a first stationary contact switch and a first movable contact switch, wherein the first stationary contact switch is connected to the protective cover, and the first movable contact switch is connected to the drive shaft and is disposed opposite to the first stationary contact switch; The second triggering component includes a second stationary contact switch and a second movable contact switch. The second stationary contact switch is connected to the protective cover, and the second movable contact switch is connected to the drive shaft and is disposed opposite to the second stationary contact switch. The second movable contact switch and the first movable contact switch are spaced apart along the axial direction of the drive shaft. The first stationary contact switch and the second stationary contact switch are electrically connected to the controller. When the material transfer component moves to the first position, the first stationary contact switch contacts the first moving contact switch, and the controller receives the trigger signal from the first stationary contact switch to control the control valve to open. When the material transfer component moves to the second position, the second stationary contact switch contacts the second moving contact switch, and the controller receives the trigger signal from the second stationary contact switch to control the control valve to open.

5. The powder quantitative feeding device according to claim 3, characterized in that, The material transfer assembly includes a first end assembly and a second end assembly. The second end assembly is connected to the side of the first end assembly facing the drive shaft. The material transfer channel is disposed in the first end assembly. The drive shaft is inserted into the feeding tube and connected to the second end assembly. When the material transfer component is in the second position, the first end component is positioned directly opposite the outlet, and the second end component is at least partially positioned directly opposite the inlet and blocks the outlet.

6. The powder quantitative feeding device according to claim 5, characterized in that, The first end component includes: A transfer tube is movably disposed within the feeding tube cavity, the axial direction of the transfer tube is perpendicular to the axial direction of the feeding tube, and the hollow channel of the transfer tube serves as the transfer channel. A sealing diaphragm is provided on both sides of the transfer tube along the axial direction of the transfer tube, and the two ends of the sealing diaphragm are in contact with and sealed to the inner wall surface of the feed tube.

7. The powder quantitative feeding device according to claim 5, characterized in that, The second end assembly includes a first connecting plate, a second connecting plate, and a baffle plate. The first connecting plate and the second connecting plate are arranged at intervals along the axial direction of the feeding pipe. The first connecting plate is connected to the side of the first end assembly facing the drive shaft. The baffle plate is connected between the first connecting plate and the second connecting plate, and the baffle plate slides in contact with the inner wall surface of the feeding pipe. The size of the baffle plate is larger than the size of the feed inlet. The drive shaft is inserted into the feeding pipe cavity and is connected to the second connecting plate.

8. The powder quantitative feeding device according to claim 5, characterized in that, The gas supply passage includes a first gas path, a second gas path, and a third gas path. The first gas path is located at the first end assembly and is connected to the material transfer channel. The third gas path is partially located at the drive shaft and is used to connect to a gas source. The second gas path is located at the second end assembly, and its two ends are respectively connected to the first gas path and the third gas path. The control valve is connected to the third gas path.

9. The powder quantitative feeding device according to claim 8, characterized in that, The first air path includes: An internal air conveying section includes a main air conveying line and a branch air conveying line. The main air conveying line is disposed on the side wall of the material transfer channel and extends along the axial direction of the material feeding pipe. The branch air conveying line is disposed on the side wall of the material transfer channel and is perpendicular to the main air conveying line. The two ends of the branch air conveying line are respectively connected to the main air conveying line and the material transfer channel. An external gas delivery section is disposed outside the first end assembly, and the two ends of the external gas delivery section are respectively connected to the internal gas delivery section and the second gas passage.

10. The powder quantitative feeding device according to claim 2, characterized in that, The feeding pipe includes a pipe body, a first end plate, and a second end plate. The feeding cavity is formed in the pipe body. The inlet and outlet are located on the side wall of the pipe body. The pipe body has a first end and a second end opposite to each other. The first end plate is fixedly connected to the first end to block the first end. The second end plate is detachably connected to the second end. The drive shaft passes through the second end plate and is connected to the material transfer assembly.

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