CN211279936U - Powder feeding device - Google Patents
Powder feeding device Download PDFInfo
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- CN211279936U CN211279936U CN201922184278.XU CN201922184278U CN211279936U CN 211279936 U CN211279936 U CN 211279936U CN 201922184278 U CN201922184278 U CN 201922184278U CN 211279936 U CN211279936 U CN 211279936U
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Abstract
The utility model provides a powder feeding device, which comprises a quantitative cup, an adjusting cup, a conveying cup, a material guide pipe and a plugging device; the plugging device comprises a valve rod, a limiting block and a double-sided plug; the quantitative cup and the adjusting cup are in threaded connection, and the integral volumes of the quantitative cup and the adjusting cup are adjusted by controlling the depth of threaded connection, so that the effects of quantification, increment and decrement are achieved; the quantitative cup and the adjusting cup are respectively provided with a blocking device in a hanging mode, the conveying cup is movably sleeved on the quantitative cup and the adjusting cup, the conveying cup slides along the quantitative cup and the adjusting cup under the driving of the driving device and simultaneously drives the blocking devices to slide together, so that the double-sided plugs can respectively block a first pouring gate of the adjusting cup and a second pouring gate of the conveying cup, and quantitative powder transmission of powder of the quantitative cup and the adjusting cup and quantitative powder feeding of the conveying cup and the material guide pipe are completed.
Description
Technical Field
The utility model relates to a powder compression moulding equipment technical field, concretely relates to powder feeding device.
Background
Powder is automatically pressed and molded, the powder is firstly filled into a mold frame (a molding cylinder cavity), and then the powder in the mold frame is pressed into a blank body with the same shape in the mold frame through hydraulic pressure or isostatic pressure; the feeder is used for continuously and regularly filling quantitative powder into a press mold frame when powder is automatically pressed and molded, so that a press can finish continuous and automatic product pressing, various types and shapes of products produced by powder pressing and molding are solved, and the pressing and molding process is always applied in various industries; the existing powder feeder mostly adopts simple spiral and push plate feeding, has unstable powder quantification, complex and tedious adjustment, and the powder is easy to scatter on equipment and float in the air, thereby causing new pollution sources, influencing the service life of the equipment and the production environment and being difficult to clean subsequently; therefore, a novel powder feeding device is urgently needed in the industry.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a powder feeding device, which comprises a quantitative cup, an adjusting cup, a conveying cup, a material guide pipe and a plugging device; one end of the quantitative cup is provided with a feed inlet, the feed inlet is provided with a valve device, and the valve device is used for controlling the opening and closing of the feed inlet; the other end of the quantifying cup is in threaded connection with the adjusting cup, a first sprue is arranged at the free end of the adjusting cup, the conveying cup is movably sleeved on the quantifying cup and the adjusting cup, a second sprue is arranged at one end of the conveying cup, the second sprue end of the conveying cup is connected with a material guide pipe, and the material guide pipe is used for feeding materials; the plugging device comprises a valve rod, a double-sided plug and a limiting block; the double-faced plug is arranged at one end of the valve rod, the limiting block is arranged at the other end of the valve rod, the plugging device is hung in the quantifying cup, the adjusting cup and the conveying cup, the limiting block is used for preventing the valve rod and the double-faced plug from falling off, two ends of the double-faced plug are respectively matched with the first pouring gate and the second pouring gate, and two ends of the double-faced plug can be respectively plugged with the first pouring gate and the second pouring gate.
Preferably, the valve device comprises a baffle plate, a transmission pipe and a valve plate, wherein the baffle plate is provided with a first feeding hole and a first mounting through hole, and the baffle plate is in threaded connection with the dosing cup through a locking ring; the valve plate is provided with a second feeding hole and a second mounting through hole, one end of the transmission pipe is connected to the second mounting through hole of the valve plate, the transmission pipe penetrates through the first mounting through hole of the baffle plate and is covered on the feeding hole of the quantitative cup, the other end of the transmission pipe is sleeved with a transmission part, and the transmission part is a gear, a belt wheel or a chain wheel and is connected with an external driving device through gear transmission, belt transmission or chain transmission; the second feeding hole of the valve plate is matched with the first feeding hole of the baffle, the transmission pipe rotates to drive the valve plate to rotate, when the second feeding hole of the valve plate is intersected with the first feeding hole of the baffle, external powder is fed into the quantitative cup and the adjusting cup, and when the second feeding hole of the valve plate is not intersected with the first feeding hole of the baffle, the feeding holes are closed.
Preferably, be equipped with the limiting plate in the driving pipe that is close to quantitative cup feed inlet one end, be equipped with the valve rod mounting hole on the limiting plate, plugging device's valve rod passes the valve rod mounting hole setting of limiting plate, and plugging device's stopper's size is greater than the size of valve rod mounting hole, sets up the stopper on the valve rod and can prevent that valve rod and two-sided end cap from dropping.
The utility model discloses still including keeping apart the protection tube, keep apart the protection tube cover and establish on the transmission pipe, and keep apart the one end of protection tube and connect in the first installation through-hole of baffle, keep apart the protection tube and be used for preventing that the powder from getting into valve device's transmission pipe, influence valve device's stable transmission.
Preferably, the cover is equipped with the bearing on the driving pipe, and the bearing is used for the spacing fixed of driving pipe, makes the driving pipe can the steady rotation simultaneously.
Preferably, the baffle is provided with a plurality of first feed holes, and the valve plate is provided with a plurality of second feed holes.
Preferably, the double-sided plug is of a conical combined structure, the first pouring gate of the adjusting cup and the second pouring gate of the conveying cup are both of a conical opening structure, and the conical structures at the two ends of the double-sided plug are used for blocking the first pouring gate and the second pouring gate respectively.
Preferably, the quantitative cup, the adjusting cup and the conveying cup are all in a sleeve or barrel structure, and the transmission pipe, the quantitative cup, the adjusting cup, the conveying cup and the plugging device are arranged on the same central axis.
Preferably, the size of the conveying cup is larger than that of the quantifying cup and the adjusting cup, the conveying cup is connected with a driving device, and the driving device is used for driving the conveying cup to slide on the adjusting cup and the quantifying cup.
Preferably, the driving device is a cylinder driving device or a motor driving device;
the cylinder driving device comprises a cylinder, the output end of the cylinder is connected with the conveying cup, and the conveying cup is driven to slide on the adjusting cup and the quantifying cup through the telescopic motion of the cylinder;
the oil cylinder driving device comprises an oil cylinder, the output end of the oil cylinder is connected with the conveying cup, and the conveying cup is driven to slide on the adjusting cup and the quantifying cup through the telescopic motion of the oil cylinder;
the motor driving device comprises a motor and an executing mechanism, the output end of the motor is connected with the executing mechanism and used for driving the executing mechanism to operate, the executing mechanism is connected with the conveying cup, and the executing mechanism drives the conveying cup to slide on the adjusting cup and the quantifying cup under the driving of the motor; the actuating mechanism is a ball screw mechanism or a slider-crank mechanism.
Use the technical scheme of the utility model, following beneficial effect has:
(1) the utility model relates to a powder feeding device, which comprises a quantitative cup, an adjusting cup, a conveying cup, a material guide pipe and a plugging device; the plugging device comprises a valve rod, a limiting block and a double-sided plug; the quantitative cup and the adjusting cup are in threaded connection, and the integral volumes of the quantitative cup and the adjusting cup are adjusted by controlling the depth of threaded connection, so that the effects of quantification, increment and decrement are achieved; the quantitative cup and the adjusting cup are respectively provided with a blocking device in a hanging mode, the conveying cup is movably sleeved on the quantitative cup and the adjusting cup, the conveying cup slides along the quantitative cup and the adjusting cup under the driving of the driving device and simultaneously drives the blocking devices to slide together, so that the double-sided plugs of the blocking devices can respectively block the first pouring gate of the adjusting cup and the second pouring gate of the conveying cup, and quantitative powder transmission of powder of the quantitative cup and the adjusting cup and quantitative powder feeding of the conveying cup and the material guide pipe are completed.
(2) The device comprises a valve device, wherein the valve device is arranged at a feed inlet of the quantitative cup and used for controlling the opening and closing of the feed inlet, the valve device comprises a baffle plate, a transmission pipe and a valve plate, a first feed hole is formed in the baffle plate, a second feed hole is formed in the valve plate, and the baffle plate is in threaded connection with the feed inlet of the quantitative cup through a lock ring; the lock ring can seal the periphery of the baffle plate to prevent external powder from permeating from the periphery of the baffle plate, one end of the transmission pipe is connected to the valve plate, the transmission pipe penetrates through the baffle plate and is arranged on the feed port of the quantitative cup, the valve plate is covered on the feed port of the quantitative cup, the second feed hole of the valve plate is matched with the first feed hole of the baffle plate, the transmission pipe is driven by an external driving device to drive the valve plate to rotate, when the second feed hole of the valve plate and the first feed hole of the baffle plate have an intersection, the external powder is fed into the quantitative cup and the adjusting cup, and when the second feed hole of the valve plate and the first feed hole of the baffle plate do not have an intersection, the; the feeding stability in the quantitative cup is effectively guaranteed.
(3) The transmission pipe outside upper shield of this application device is equipped with the isolation protection tube, and the one end of keeping apart the protection tube is connected in the first installation through-hole of baffle, keeps apart the fine transmission pipe and the transmission who has prevented outside powder entering valve device of protection tube, influences the valve device and closes the stable transmission.
(4) This application device is equipped with the limiting plate in the driving pipe that is close to quantitative cup feed inlet one end, is equipped with the valve rod mounting hole on the limiting plate, and plugging device's valve rod passes the valve rod mounting hole setting of limiting plate, and plugging device's stopper's size is greater than the size of valve rod mounting hole, sets up the stopper on the valve rod and can prevent that valve rod and two-sided end cap from dropping, and the driving pipe is stopped up first runner and/or second runner and is provided the slip space, reasonable in design for two-sided end cap slides from top to bottom simultaneously.
In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be described in further detail with reference to the drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. In the drawings:
FIG. 1 is a schematic view showing the construction of a powder feeding apparatus according to the present embodiment;
FIG. 2 is a schematic view of the dosing cup and adjustment cup of FIG. 1;
FIG. 3 is a schematic view of the closure of FIG. 1;
FIG. 4 is a schematic structural view of the drive tube, valve plate and lock ring of FIG. 1;
FIG. 5 is a schematic view showing the feeding, the material conveying and the material feeding of the powder feeding apparatus of the present embodiment;
the device comprises a material guide pipe 1, a conveying cup 2, a second pouring gate 2.1, an adjusting cup 3, a first pouring gate 3.1, a quantifying cup 4, a locking ring 5, a baffle 6, a baffle 7, an isolation protection pipe 8, a bearing 9, a transmission part 10, a transmission pipe 11, a valve plate 12, a double-sided plug 13, a limiting block 14 and a valve rod.
Detailed Description
The embodiments of the invention will be described in detail hereinafter with reference to the accompanying drawings, but the invention can be implemented in many different ways, which are defined and covered by the claims.
Example 1:
referring to fig. 1 to 4, a powder feeding device comprises a dosing cup 4, a regulating cup 3, a conveying cup 2, a material guide pipe 1 and a plugging device; one end of the quantitative cup is provided with a feed inlet, the feed inlet is provided with a valve device, and the valve device is used for controlling the opening and closing of the feed inlet; the other end of the quantitative cup is in threaded connection with the adjusting cup, a first sprue 3.1 is arranged at the free end of the adjusting cup 3, the conveying cup is movably sleeved on the quantitative cup and the adjusting cup, a second sprue 2.1 is arranged at one end of the conveying cup 2, the second sprue end of the conveying cup is connected with the material guide pipe 1, the material guide pipe is of a circular truncated cone pipe or conical pipe structure, and the material guide pipe is used for feeding a formed cylinder body and has the functions of preventing sealing material from raising dust and preventing powder from leaking; the plugging device comprises a valve rod 14, a double-sided plug 12 and a limiting block 13; the double-sided plug is arranged at one end of the valve rod, the limiting block is arranged at the other end of the valve rod, the plugging device is hung in the quantifying cup, the adjusting cup and the conveying cup, the limiting block is used for preventing the valve rod and the double-sided plug from falling off, the double-sided plug is of a conical combined structure, and a first sprue of the adjusting cup and a second sprue of the conveying cup are of conical opening structures; the two ends of the double-sided plug are respectively matched with the first pouring gate and the second pouring gate, and the two ends of the double-sided plug can be respectively plugged with the first pouring gate and the second pouring gate.
The valve device comprises a baffle 6, a transmission pipe 10 and a valve plate 11, wherein the baffle is provided with a first feeding hole and a first mounting through hole, and the baffle 6 is in threaded connection with a feeding hole of the dosing cup 4 through a locking ring 5; the valve plate is provided with a second feeding hole and a second mounting through hole, one end of the transmission pipe is connected to the second mounting through hole of the valve plate, the transmission pipe penetrates through the first mounting through hole of the baffle plate, the valve plate and the baffle plate are arranged in a fit mode, the valve plate 11 is arranged on the feeding hole of the quantitative cup 4 in a covering mode, a limiting plate is arranged in the transmission pipe close to one end of the feeding hole of the quantitative cup, a valve rod mounting hole is formed in the limiting plate, a valve rod of the plugging device penetrates through the valve rod mounting hole of the limiting plate, the size of a limiting block of the plugging device is larger than that of the valve rod mounting hole; the other end of the transmission pipe 10 is sleeved with a transmission part 9 which is a gear, a belt wheel or a chain wheel and is connected with an external driving device (not shown) through gear transmission, belt transmission or chain transmission; the second feeding hole of the valve plate is matched with the first feeding hole of the baffle, the transmission pipe rotates to drive the valve plate to rotate, when the second feeding hole of the valve plate is intersected with and overlapped with the first feeding hole of the baffle, external powder is fed into the quantitative cup and the adjusting cup, and when the second feeding hole of the valve plate is not intersected with the first feeding hole of the baffle, the feeding holes are closed, and feeding is stopped. The external driving device is a motor.
The isolation protection tube 7 covers the transmission tube 10, one end of the isolation protection tube is connected to the first installation through hole of the baffle, and the isolation protection tube is used for preventing powder from entering the transmission tube of the valve device and influencing the stable transmission of the valve device.
The cover is equipped with bearing 8 on the transmission pipe 10, and the bearing is laid between transmission pipe and isolation protection tube, and the bearing is used for the spacing fixed of transmission pipe, makes the transmission pipe can stable rotation simultaneously.
The baffle plate is provided with a plurality of first feeding holes, and the valve plate is provided with a plurality of second feeding holes; the arrangement of the plurality of first feeding holes and the plurality of second feeding holes can accelerate external powder to enter the quantitative cup.
The quantitative cup, the adjusting cup and the conveying cup are all in a sleeve or barrel structure, and the transmission pipe, the quantitative cup, the adjusting cup, the conveying cup and the plugging device are arranged on the same central axis; the transfer cup, which is larger in size than the dosing and conditioning cups, is connected to a drive (not shown) for driving the transfer cup to slide over the conditioning and dosing cups.
The driving device is an air cylinder driving device or an oil cylinder driving device or a motor driving device; the cylinder driving device comprises a cylinder, the output end of the cylinder is connected with the conveying cup, and the conveying cup is driven to slide on the adjusting cup and the quantifying cup through the telescopic motion of the cylinder; the oil cylinder driving device comprises an oil cylinder, the output end of the oil cylinder is connected with the conveying cup, and the conveying cup is driven to slide on the adjusting cup and the quantifying cup through the telescopic motion of the oil cylinder; the motor driving device comprises a motor and an executing mechanism, the output end of the motor is connected with the executing mechanism and used for driving the executing mechanism to operate, the executing mechanism is connected with the conveying cup, and the executing mechanism drives the conveying cup to slide on the adjusting cup and the quantifying cup under the driving of the motor; the actuating mechanism is a ball screw mechanism or a gear rack mechanism or a crank slider mechanism; the motor drives the ball screw to rotate, the arrangement direction of the ball screw is consistent with that of the adjusting cup and the quantifying cup, a screw nut sleeved on the ball screw is fixedly connected with the conveying cup, and the conveying cup slides on the adjusting cup and the quantifying cup through the matching of the screw nut and the ball screw; or the motor drives the gear to rotate, the gear rotates to drive the rack to move in a telescopic mode, and the rack is connected with the conveying cup so as to drive the conveying cup to slide on the adjusting cup and the quantifying cup; or the motor drives the crank block mechanism to operate, the output end of the crank block is connected with the conveying cup, and the crank block mechanism converts the circular motion of the motor into the linear motion of the conveying cup on the adjusting cup and the quantifying cup to realize the sliding of the conveying cup.
Referring to fig. 5, the device of the present embodiment operates: the method comprises three steps of quantitative cup and adjusting cup quantitative feeding, material conveying and conveying cup feeding;
the volume of the quantitative cup and the volume of the adjusting cup are adjusted according to the volume of powder required by the formed cylinder body, and the whole volume of the quantitative cup and the adjusting cup is adjusted through screwing, and screwing depth of the screw threads; the conveying cup is driven by the driving device to slide upwards and downwards to be sleeved with the adjusting cup and the quantifying cup, in the sleeving process, a second pouring gate of the conveying cup is matched with the double-sided plug to plug, and meanwhile, the double-sided plug and the valve rod are driven to slide upwards, so that two ends of the double-sided plug simultaneously plug the first pouring gate and the second pouring gate; the valve device is driven by an external driving device, and the transmission pipe drives the valve plate to rotate, so that the second feeding hole of the valve plate is superposed with the first feeding hole of the baffle plate, and feeding and charging of the quantitative cup and the adjusting cup are realized; when the quantitative cup and the adjusting cup are filled with powder, the transmission pipe drives the valve plate to rotate, so that a second feeding hole of the valve plate and a first feeding hole of the baffle do not intersect, the first feeding hole and the second feeding hole are blocked, and feeding of an external powder bin is stopped; the driving device drives the conveying cup to be separated from the adjusting cup and the quantifying cup downwards, the valve rod and the double-sided plug of the plugging device simultaneously move downwards under the action of gravity until the valve rod is limited by the limiting block, and the double-sided plug still plugs the second sprue until powder in the quantifying cup and the adjusting cup is completely conveyed to the conveying cup, so that material conveying is completed; the driving device continues to drive the conveying cup to move downwards, the double-sided plug is limited by the limiting block and separated from the second pouring gate of the conveying cup, and the conveying cup accurately sends powder into the forming cylinder body through the connected material guide pipe.
The quantitative cup and the adjusting cup of the device are in threaded connection and match, the purpose of increasing or reducing the amount of the fed powder can be achieved, and meanwhile, the feeding device is connected in a ring-shaped manner and sealed in place in the feeding, material conveying and material conveying processes, so that the environmental influence factors such as powder dust raising and scattering are effectively reduced; and through controlling the operation of the driving device and the external driving device, the automatic feeding of the feeding device can be realized, the post labor is reduced, the safe and automatic product pressing of the forming cylinder body is facilitated, and the purposes of continuous and stable production and production cost reduction are ensured.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A powder feeding device is characterized by comprising a quantifying cup, an adjusting cup, a conveying cup, a material guide pipe and a plugging device; one end of the quantitative cup is provided with a feed inlet, the feed inlet is provided with a valve device, and the valve device is used for controlling the opening and closing of the feed inlet; the other end of the quantifying cup is in threaded connection with the adjusting cup, a first sprue is arranged at the free end of the adjusting cup, the conveying cup is movably sleeved on the quantifying cup and the adjusting cup, a second sprue is arranged at one end of the conveying cup, the second sprue end of the conveying cup is connected with a material guide pipe, and the material guide pipe is used for feeding materials; the plugging device comprises a valve rod, a double-sided plug and a limiting block; the double-faced plug is arranged at one end of the valve rod, the limiting block is arranged at the other end of the valve rod, the plugging device is hung in the quantifying cup, the adjusting cup and the conveying cup, the limiting block is used for preventing the valve rod and the double-faced plug from falling off, two ends of the double-faced plug are respectively matched with the first pouring gate and the second pouring gate, and two ends of the double-faced plug can be respectively plugged with the first pouring gate and the second pouring gate.
2. The powder feeding device according to claim 1, wherein the valve device comprises a baffle plate, a transmission pipe and a valve plate, the baffle plate is provided with a first feeding hole and a first mounting through hole, and the baffle plate is in threaded connection with the dosing cup through a locking ring; the valve plate is provided with a second feeding hole and a second mounting through hole, one end of the transmission pipe is connected to the second mounting through hole of the valve plate, the transmission pipe penetrates through the first mounting through hole of the baffle plate and is covered on the feeding hole of the quantitative cup, the other end of the transmission pipe is sleeved with a transmission part, and the transmission part is a gear, a belt wheel or a chain wheel and is connected with an external driving device through gear transmission, belt transmission or chain transmission; the second feeding hole of the valve plate is matched with the first feeding hole of the baffle, the transmission pipe rotates to drive the valve plate to rotate, when the second feeding hole of the valve plate is intersected with the first feeding hole of the baffle, external powder is fed into the quantitative cup and the adjusting cup, and when the second feeding hole of the valve plate is not intersected with the first feeding hole of the baffle, the feeding holes are closed.
3. The powder feeding device according to claim 2, wherein a limiting plate is arranged in the transmission pipe close to the feed inlet end of the quantitative cup, a valve rod mounting hole is formed in the limiting plate, a valve rod of the plugging device passes through the valve rod mounting hole of the limiting plate, the size of the limiting block of the plugging device is larger than that of the valve rod mounting hole, and the limiting block arranged on the valve rod can prevent the valve rod and the double-sided plug from falling.
4. The powder feeding device according to claim 2, comprising an isolation protection tube covering the transmission tube, wherein one end of the isolation protection tube is connected to the first mounting hole of the baffle plate, and the isolation protection tube is used for preventing powder from entering the transmission tube of the valve device and affecting the stable transmission of the valve device.
5. The powder feeding device according to claim 4, wherein the transmission tube is sleeved with a bearing, and the bearing is used for limiting and fixing the transmission tube and simultaneously enabling the transmission tube to stably rotate.
6. The powder charging device as defined in claim 2, wherein the baffle plate is provided with a plurality of first charging holes, and the valve plate is provided with a plurality of second charging holes.
7. The powder feeding device according to any one of claims 1 to 6, wherein the double-sided plug has a conical combined structure, the first gate of the regulating cup and the second gate of the conveying cup have a conical opening structure, and the conical structures at the two ends of the double-sided plug are used for respectively blocking the first gate and the second gate.
8. The powder feeding device according to claim 7, wherein the dosing cup, the adjusting cup and the conveying cup are all of a sleeve or a cylinder structure, and the transmission pipe, the dosing cup, the adjusting cup, the conveying cup and the plugging device are arranged on the same central axis.
9. The powder charging device according to claim 8, wherein the transfer cup is larger in size than the dosing cup and the conditioning cup, and wherein the transfer cup is connected to a driving device for driving the transfer cup to slide on the conditioning cup and the dosing cup.
10. The powder feeding device according to claim 9, wherein the driving device is a cylinder driving device or a motor driving device;
the cylinder driving device comprises a cylinder, the output end of the cylinder is connected with the conveying cup, and the conveying cup is driven to slide on the adjusting cup and the quantifying cup through the telescopic motion of the cylinder;
the oil cylinder driving device comprises an oil cylinder, the output end of the oil cylinder is connected with the conveying cup, and the conveying cup is driven to slide on the adjusting cup and the quantifying cup through the telescopic motion of the oil cylinder;
the motor driving device comprises a motor and an executing mechanism, the output end of the motor is connected with the executing mechanism and used for driving the executing mechanism to operate, the executing mechanism is connected with the conveying cup, and the executing mechanism drives the conveying cup to slide on the adjusting cup and the quantifying cup under the driving of the motor; the actuating mechanism is a ball screw mechanism or a slider-crank mechanism.
Priority Applications (1)
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CN201922184278.XU CN211279936U (en) | 2019-12-09 | 2019-12-09 | Powder feeding device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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CN201922184278.XU CN211279936U (en) | 2019-12-09 | 2019-12-09 | Powder feeding device |
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CN211279936U true CN211279936U (en) | 2020-08-18 |
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CN201922184278.XU Active CN211279936U (en) | 2019-12-09 | 2019-12-09 | Powder feeding device |
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