Powder conveying device

Abstract

The invention discloses a powder conveying device which comprises a separator assembly used for powder-gas separation, a powder barrel used for storing powder, a powder pump assembly used for conveying the powder and an ejector device used for ejecting the powder, the separator assembly is provided with a first powder inlet, a first powder outlet and an exhaust port, and a powder containing cavity is formed in the powder barrel; the powder barrel is provided with a second powder inlet communicated with the powder containing cavity, the first powder outlet is connected with the second powder inlet, the powder pump assembly is provided with a second powder outlet, the ejector device is provided with a powder cavity and a powder spraying opening which are communicated, and the second powder outlet is communicated with the powder containing cavity and the powder spraying opening. According to the powder conveying device, powder-gas separation is conducted on powder with airflow entering the powder barrel through the separator assembly, so that the problems that too much gas is accumulated in the powder barrel, and the air pressure in the powder barrel is too large are well solved, storage of the powder in the powder barrel and subsequent powder spraying of an ejector are prevented from being affected, and therefore the powder conveying effect is well guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of powder spraying, in particular to a powder conveying device. Background Art

[0002] In the food can manufacturing industry, in order to facilitate customers who buy food to quickly open the food cans, the food can manufacturing industry has invented a high vacuum pressing sealing method. In order to quickly open the high vacuum food cans, a small hole is punched in the iron metal cover of the food can and covered with a small piece of easy-tear film. When eating, just pull the small piece of easy-tear film to eliminate the vacuum and easily open the iron cover of the can. Both sides of this iron cover are covered with anti-corrosion coatings for protection, that is, the metal can cover needs to be treated with powder spraying to prevent rust to meet food safety needs. The above powder spraying is a spraying process in which resin powder is sprayed on the workpiece.

[0003] Among them, powder spraying involves the transportation of powder, in which the powder with air flow is transported from the powder supply station to the powder barrel for storage, and further transported from the powder cylinder through the injector to the powder spraying equipment for powder spraying; however, the powder conveying device in the prior art cannot well separate the powder and gas entering the powder barrel with air flow, which may easily lead to excessive gas accumulation in the powder barrel, excessive air pressure in the powder barrel, etc., which may easily affect the storage of powder in the powder barrel and the subsequent powder spraying of the injector, etc., affecting the powder conveying effect. Summary of the invention

[0004] 1. Technical issues to be solved

[0005] In view of the deficiencies in the prior art, the present invention provides a powder conveying device that can solve the above technical problems.

[0006] (II) Technical solution

[0007] To solve the above technical problems, the present invention provides the following technical solutions: a powder conveying device, comprising a separator assembly for powder-gas separation, a powder barrel for storing powder, a powder pump assembly for conveying powder and an injector device for spraying powder, the separator assembly is provided with a first powder inlet, a first powder outlet and a gas reflux port, the interior of the powder barrel is provided with a powder receiving chamber, the powder barrel is provided with a second powder inlet communicating with the powder receiving chamber, the first powder outlet is connected to the second powder inlet, the powder pump assembly is provided with a second powder outlet, the injector device is provided with a connected powder chamber and a powder injection port, and the second powder outlet communicates the powder receiving chamber with the powder injection port.

[0008] Preferably, the separator assembly includes a powder-gas separator, a balancer and a connecting pipe. The balancer is located above the powder-gas separator. The interior of the balancer is connected to the interior of the powder-gas separator through the connecting pipe. The first powder inlet is arranged near the top of the powder-gas separator, the first powder outlet is arranged at the bottom of the powder-gas separator, the gas reflux port is arranged on the connecting pipe, and the second powder inlet is arranged at the top of the powder barrel.

[0009] Preferably, the balancer includes a shell and a powder filter tube, the powder filter tube is arranged inside the shell, the powder filter tube is connected to the connecting tube, and the shell is provided with a through hole.

[0010] Preferably, the separator is in the shape of a conical cylinder.

[0011] Preferably, a first microporous plate is provided inside the powder barrel, the first microporous plate is arranged close to the bottom end of the powder barrel, and a first fluidization air inlet connected to the first microporous plate is provided on the outer wall of the powder barrel.

[0012] Preferably, the outer wall of the powder barrel is provided with a powder cleaning pipe, and the powder cleaning pipe is provided with a powder extraction port.

[0013] Preferably, the powder pump assembly includes a motor, a driving gear, a screw seat and a screw rod. The motor and the driving gear are both arranged on the outer wall of the powder barrel. The screw rod is arranged on the screw seat. One end of the screw rod is located in the powder receiving chamber. The other end of the screw rod is connected to the motor through the driving gear. A third powder outlet connected to the second powder outlet is provided at the bottom of the screw seat. The second powder outlet is arranged close to the screw rod.

[0014] Preferably, the injector device includes an injector seat, an injector and a powder spraying part, the powder spraying part and the injector are respectively arranged at the front end and the rear end of the injector seat, the powder spraying part and the injector are arranged near the bottom of the injector seat, the powder chamber is arranged at the upper part of the injector seat, the top of the powder chamber is provided with a third powder inlet connected to the third powder outlet, the bottom of the powder chamber is provided with a fourth powder outlet, the powder spraying part and the injector are arranged near the fourth powder outlet, the rear end of the injector is connected to the injector air inlet, the front end of the injector is arranged near the rear end of the powder spraying part, the powder spraying port is located at the front end of the powder spraying part, and the powder spraying port is connected to a powder pipe joint.

[0015] Preferably, a second fluidizing air inlet is provided at the bottom of the injector seat, a second microporous plate is provided on the second fluidizing air inlet, and the second microporous plate is arranged close to the rear end of the powder spraying member.

[0016] Preferably, a first air pipe joint is provided on the top of the powder barrel, and a second air pipe joint is provided on the top of the screw seat, and the first air pipe joint and the second air pipe joint are connected through an air inlet pipe.

[0017] (III) Beneficial effects

[0018] Compared with the prior art, the present invention provides a powder conveying device having the following beneficial effects: the present invention is provided with a separator assembly, through which powder entering the powder barrel with airflow is separated from gas, so as to better avoid problems such as excessive gas accumulation in the powder barrel and excessive air pressure in the powder barrel, avoid affecting the storage of powder in the powder barrel and subsequent powder injection of the injector, etc., thereby better ensuring the powder conveying effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a perspective view of a powder conveying device of the present invention;

[0020] Figure 2 is a perspective view of a separator assembly of the present invention;

[0021] Figure 3 It is a first stereoscopic view of the powder barrel, the powder pump assembly and the injector device of the present invention;

[0022] Figure 4 A second stereoscopic view of the powder barrel, the powder pump assembly and the injector device of the present invention;

[0023] Figure 5 is a three-dimensional diagram of a first microplate of the present invention;

[0024] Figure 6 It is a first stereoscopic view of the powder pump assembly and the injector device of the present invention;

[0025] Figure 7 A second stereoscopic view of the powder pump assembly and the injector device of the present invention;

[0026] Figure 8 is a perspective view of an ejector device of the present invention;

[0027] Fig. 9 A three-dimensional diagram of the injector and the powder spraying part of the present invention;

[0028] Fig.10 It is a rear view of the powder pump assembly and the injector device of the present invention;

[0029] Fig.11 for Fig.10 The cross-section along the AA direction;

[0030] Fig.12 A first front view of the powder spraying device of the present invention (showing a high voltage generator);

[0031] Fig.13 for Fig.12 The cross-section along the BB direction;

[0032] Fig.14 A second front view of the powder spraying equipment of the present invention;

[0033] Fig.15 A perspective view of a powder spraying device according to the present invention;

[0034] Fig.16 It is a three-dimensional image of a metal can lid;

[0035] Fig.17 It is a partial structural cross-sectional view of the powder spraying equipment of the present invention;

[0036] Fig.18 It is a top view of a metal can lid;

[0037] Fig.19 A cross-sectional view of a spray layer obtained by spraying powder on a metal can cover hole using the powder spraying equipment of the present invention;

[0038] Fig. 20 It is a schematic diagram of the powder supply pipeline of the present invention.

[0039] The numbers in the figure are: 11 separator assembly, 12 powder barrel, 13 powder pump assembly, 14 injector device, 15 first powder inlet, 16 gas reflux port, 17 second powder inlet, 18 powder gas separator, 19 balancer, 110 connecting pipe, 111 through hole, 112 first microporous plate, 113 first fluidizing air inlet, 114 powder cleaning pipe, 115 motor, 116 driving gear, 117 screw seat, 118 screw rod, 119 injector seat, 120 injector, 121 powder spraying part, 122 third powder inlet, 123 injector air inlet, 124 powder pipe joint, 125 second fluidizing air inlet, 126 second microporous plate, 127 first air pipe joint, 128 second air pipe joint, 129 powder cavity, 130 second powder outlet, 21 powder spray head, 22 powder spray pressure head, 23 powder spray head body, 24 high-voltage discharge needle, 25 lower powder spray lip, 26 powder spray pressure head body, 27 upper powder spray lip, 28 ceramic ball, 29 powder spray cavity, 210 powder supply pipe, 211 recovery cavity, 212 first powder recovery pipe, 213 second powder recovery pipe, 214 high-voltage generator, 215 blow needle gas joint, 216 station positioning piece, 217 third powder recovery pipe, 218 ceramic ball anti-absorption rod, 219 buffer piece, 220 joint, 221 mounting frame, 31 powder supply station, 32 external recovery device, 33 compressed gas tank, 34 fluidization pressure regulating valve, 35 powder spray pressure regulating valve, 36 powder spray solenoid valve, 37 blow needle pressure regulating valve. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] like Figure 1-11 , Fig. 20 As shown, the powder conveying device of the present invention comprises a separator assembly 11 for powder-gas separation, a powder barrel 12 for storing powder, a powder pump assembly 13 for conveying powder, and an injector device 14 for injecting powder. The separator assembly 11 is provided with a first powder inlet 15, a first powder outlet, and a gas reflux port 16, the powder barrel 12 is provided with a powder receiving chamber inside, the powder barrel 12 is provided with a second powder inlet 17 communicating with the powder receiving chamber, the first powder outlet is connected to the second powder inlet 17, the powder pump assembly 13 is provided with a second powder outlet 130, the injector device 14 is provided with a powder chamber 129 and a powder outlet connected to each other, and the second powder outlet 130 communicates with the powder receiving chamber and the powder outlet.

[0042] It can be understood that the above-mentioned first powder inlet 15 is an external powder adding port, and the first powder inlet 15 of the separator assembly 11 is connected to the external powder supply station 31, so that the powder with airflow, that is, the powder-gas combination, enters the separator assembly 11 from the powder supply station 31, and the powder with airflow is separated from the gas by the separator assembly 11, so that the powder falls and the gas rises, wherein the gas is discharged outward from the gas reflux port 16, and the powder enters the powder receiving chamber of the powder barrel 12 from the first powder outlet through the second powder inlet 17; further, the powder pump assembly 13 transports the powder in the powder receiving chamber to the powder chamber 129 of the injector device 14 through the second powder outlet 130; finally, the powder is sprayed outward through the powder spraying port of the injector device 14.

[0043] Preferably, the separator assembly 11 includes a powder gas separator 18, a balancer 19 and a connecting pipe 110, the balancer 19 is located above the powder gas separator 18, the interior of the balancer 19 is connected to the interior of the powder gas separator 18 through the connecting pipe 110, the first powder inlet 15 is arranged near the top of the powder gas separator 18, the first powder outlet is arranged at the bottom of the powder gas separator 18, the gas reflux port 16 is arranged on the connecting pipe 110, and the second powder inlet 17 is arranged at the top of the powder barrel 12. Further, the balancer 19 includes a shell and a powder filter tube, the powder filter tube is arranged inside the shell, the powder filter tube is connected to the connecting pipe 110, the shell is provided with a through hole 111, wherein the above-mentioned powder filter tube can filter out powder and allow gas to pass, and the powder filter tube is connected to the outside atmosphere through the through hole 111. Preferably, the separator 18 is in the shape of a conical cylinder.

[0044] In the above-mentioned separator assembly 11, when the powder with airflow enters the powder-gas separator 18 from the powder supply station 31 through the first powder inlet 15, the kinetic energy of the powder with airflow can be better buffered by the inner wall of the powder-gas separator 18, so that the powder therein spirally descends to the first powder outlet at the bottom of the powder-gas separator 18, and the gas in the powder-gas separator 18 moves upward and further discharged to the outside through the gas reflux port 16 of the connecting pipe 110; in addition, the gas in the powder-gas separator 18 can also be discharged to the outside through the powder filter tube and the through hole 111 of the balancer 19, and the balancer 19 can balance the air pressure in the powder-gas separator 18 by connecting with the outside atmosphere, so as to keep the air pressure in the powder barrel 12 close to the atmospheric pressure; in the above manner, the separator assembly 11 can play a better powder-gas separation role for the powder with airflow.

[0045] In addition, preferably, a first microporous plate 112 is provided inside the powder barrel 12, and the first microporous plate 112 is arranged near the bottom end of the powder barrel 12. The first microporous plate 112 can allow gas to pass through but powder cannot pass through. The outer wall of the powder barrel 12 is provided with a first fluidizing air inlet 113 connected to the first microporous plate 112. The first microporous plate 112 is provided with a plurality of micropores. Air is introduced into the first microporous plate 112 through the first fluidizing air inlet 113. The gas acts on the powder in the powder barrel 12 through the micropores, so that the powder is fluidized and the powder remains fluffy, thereby making the powder pump assembly 13 faster and more conducive to conveying the powder in the powder barrel 12.

[0046] In this embodiment, the outer wall of the powder barrel 12 is provided with a powder cleaning pipe 114, and the powder cleaning pipe 114 is provided with a powder extraction port, and when the powder barrel 12 is repaired and cleaned, the excess powder in the powder barrel 12 can be extracted through the powder extraction port. In addition, preferably, the powder barrel 12 can be provided with a powder level sensor for monitoring the powder height in the powder barrel 12.

[0047] Specifically, the powder pump assembly 13 of this embodiment includes a motor 115, a driving gear 116, a screw seat 117 and a screw rod 118. The motor 115 and the driving gear 116 are both arranged on the outer wall of the powder barrel 12. The screw rod 118 is arranged on the screw seat 117. One end of the screw rod 118 is located in the powder receiving chamber. The other end of the screw rod 118 is connected to the motor 115 through the driving gear 116. The driving gear 116 is driven by the motor 115. The amount of powder output is adjusted by adjusting the rotation angle. The bottom of the screw seat 117 is provided with a third powder outlet connected to the second powder outlet 130. The second powder outlet 130 is arranged close to the screw rod 118. The number of the screw rod 118 can be multiple.

[0048] In addition, the injector device 14 of the present embodiment specifically includes an injector seat 119, an injector 120 and a powder spraying part 121. The powder spraying part 121 and the injector 120 are respectively arranged at the front end and the rear end of the injector seat 119. The powder spraying part 121 and the injector 120 are both arranged near the bottom of the injector seat 119. The above-mentioned powder chamber 129 is arranged at the upper part of the injector seat 119. The top of the powder chamber 129 is provided with a third powder inlet 122 connected to the third powder outlet. The bottom of the powder chamber 129 is provided with a fourth powder outlet. The powder spraying part 121 and the injector 120 are arranged near the fourth powder outlet. The rear end of the injector 120 is connected with an injector air inlet 123. The front end of the injector 120 is arranged near the rear end of the powder spraying part 121. The above-mentioned powder spraying port is located at the front end of the powder spraying part 121, and the powder spraying port is connected with a powder pipe joint 124. The above-mentioned injector 120, powder spraying member 121, injector air inlet 123, and powder hose joint 124 can be provided in plurality.

[0049] The working principle of the powder pump assembly 13 and the injector device 14 in the present embodiment is as follows: the motor 115 drives the screw rod 118 to rotate through the driving gear 116, and the screw rod 118 transports the powder in the powder containing chamber of the powder barrel 12 from the second powder outlet 130 to the third powder outlet, and the powder further enters the powder chamber 129 of the injector seat 119 through the third powder outlet and the third powder inlet 122, that is, the powder rotated out by the screw rod 118 remains in the powder chamber 129 to wait for the injector 120 to suck it away and spray it out; further, the rear end of the injector 120 is connected to the air flow through the injector air inlet 123, and the air flow sucks the powder in the powder chamber 129 from the fourth powder outlet and sprays it into the powder spraying part 121, that is, the powder is sprayed from the rear end of the powder spraying part 121 to the front end of the powder spraying part 121, and the powder is finally sprayed outward through the powder spraying port and the powder pipe joint 124.

[0050] Preferably, a second fluidizing air inlet 125 is provided at the bottom of the injector seat 119, and a second microporous plate 126 is provided on the second fluidizing air inlet 125. The second microporous plate 126 is provided near the rear end of the powder spraying member 121, and the second microporous plate 126 allows gas to pass through while powder cannot pass through. The second microporous plate 126 is connected to the airflow through the second fluidizing air inlet 125, and the airflow blows the powder upward through the second microporous plate 126 to prevent the powder near the rear end of the powder spraying member 121 from settling and agglomerating, that is, to keep the powder in a fluffy state, thereby ensuring the spraying effect of the injector 120 on the powder. A plurality of the second fluidizing air inlet 125 may be provided.

[0051] In addition, preferably, a first air pipe joint 127 is provided on the top of the powder barrel 12, and a second air pipe joint 128 is provided on the top of the screw seat 117. The first air pipe joint 127 and the second air pipe joint 128 are connected through an air inlet pipe, and the first air pipe joint 127 and the second air pipe joint 128 can be multiple; the gas in the powder barrel 12 can enter the screw seat 117 through the first air pipe joint 127, the air inlet pipe, and the second air pipe joint 128, so that the powder barrel 12 and the screw seat 117 maintain the same pressure when the injector device 14 injects powder, thereby preventing the injector device 14 from sucking away the powder from the second powder outlet 130 when injecting powder to ensure that the injector device 14 sprays powder normally.

[0052] In addition, preferably, the present invention may also include a powder spraying device, which is connected to the powder pipe joint 124, so that the powder spraying device can spray powder on a workpiece such as a metal can cover, and specifically can spray powder on the cut edge of the metal can cover hole (such as Figure 16-18 As shown, the cut edge of the hole, i.e., the inner wall of the hole of the metal can cover, needs to be sprayed with powder to achieve the anti-rust effect. However, the prior art cannot evenly spray the powder on the cut edge of the metal can cover hole, that is, there is a problem of the powder covering the cut edge of the metal can cover hole, that is, the powder cannot play a good anti-rust role for the metal can cover hole, which makes it difficult for the metal can cover to meet the food safety requirements. Figure 12-19 As shown, the powder spraying equipment of the present invention includes a powder spraying head 21 and a powder spraying pressure head 22. The powder spraying head 21 can be moved up and down. Specifically, the powder spraying head 21 can be fixedly arranged on a mechanism that can move up and down through a mounting frame 221 and other structural parts; the powder spraying pressure head 22 is fixedly arranged above the powder spraying head 21. Among them, the powder spraying head 21 includes a powder spraying head body 23, a high-voltage discharge needle 24 and a lower powder spraying lip 25, and the powder spraying pressure head 22 includes a powder spraying pressure head body 26, an upper powder spraying lip 27 and a ceramic ball 28. When there is a metal can cover, the powder spraying head 21 lifts the iron metal can cover to the bottom of the powder spraying pressure head 22 and presses the upper powder spraying lip 27 and the lower powder spraying lip 25 against the upper and lower surfaces of the can cover.

[0053] The lower powder spray lip 25 is arranged at the upper end of the powder spray head body 23, and the upper end of the lower powder spray lip 25 is provided with a first opening. The interior of the powder spray head body 23 is provided with a powder spray chamber 29, and the first opening is communicated with the powder spray chamber 29. The high-voltage discharge needle 24 is arranged in the powder spray chamber 29. The lower end of the powder spray chamber 29 is connected to a powder supply pipe 210, and the powder supply pipe 210 is connected to the above-mentioned powder pipe joint 124.

[0054] The upper powder spray lip 27 is arranged at the lower end of the powder spray head body 26, and a receiving cavity is provided inside the upper powder spray lip 27. A second opening is provided at the lower end of the receiving cavity. The ceramic ball 28 is received in the receiving cavity. The diameter of the ceramic ball 28 is larger than the aperture of the second opening to avoid the ceramic ball 28 from falling from the second opening, and the diameter of the ceramic ball 28 is preferably slightly larger than the aperture of the second opening to achieve a better powder blocking effect; the second opening and the first opening are arranged correspondingly up and down, and the apertures of the second opening and the first opening are preferably larger than the aperture of the metal can cover hole by 3-5 mm, preferably 3.5 mm.

[0055] Preferably, a recovery chamber 211 is further provided inside the powder spray head body 23, the first opening is communicated with the recovery chamber 211, and the lower end of the recovery chamber 211 is connected with a powder recovery pipe, which can be connected with an external recovery device 32 to achieve powder recycling; in this embodiment, the lower end of the recovery chamber 211 is specifically connected with a first powder recovery pipe 212 and a second powder recovery pipe 213, that is, the recovery chamber 211 is connected with two powder recovery pipes to achieve a better powder recovery effect, and the first powder recovery pipe 212 and the second powder recovery pipe 213 are respectively located on both sides of the recovery chamber 211. In addition, various joints 220 can be provided outside the powder spray head body 23 to respectively connect the above-mentioned powder supply pipe 210, the first powder recovery pipe 212, and the second powder recovery pipe 213, so that the powder supply pipe 210 can be conveniently connected to the powder pipe joint 124, and the first powder recovery pipe 212 and the second powder recovery pipe 213 can be conveniently connected to the external recovery device 32.

[0056] Specifically, the powder spray head 21 further includes a high voltage generator 214 , which is disposed inside the powder spray head body 23 and connected to the high voltage discharge needle 24 , and is used to provide high voltage to the high voltage discharge needle 24 .

[0057] Preferably, the powder spray head 21 also includes a blow needle air joint 215, which is arranged on the outside of the powder spray head body 23, and a mounting tube is provided in the powder spray chamber 29, and the high-voltage discharge needle 24 is partially arranged inside the mounting tube. The blow needle air joint 215 is connected to the inside of the mounting tube. It can be understood that the blow needle air joint 215 is connected to the external air supply device, and the mounting tube is blown through the blow needle air joint 215 to blow away the powder attached to the high-voltage discharge needle 24, thereby better ensuring the use effect of the high-voltage discharge needle 24.

[0058] Preferably, the powder spray head 21 also includes a station positioning piece 216, which is arranged at the upper end of the powder spray head body 23. The station positioning piece 216 is used to position workpieces such as metal can covers to ensure the powder spraying accuracy of the metal can cover holes. The station positioning piece of the existing technology can be used, and no excessive restrictions are made here.

[0059] In this embodiment, the powder injection head 22 also includes a third powder recovery pipe 217, which is arranged inside the powder injection head body 26. The third powder recovery pipe 217 is connected to the receiving chamber to recover the powder entering the receiving chamber. The third powder recovery pipe 217 can also be connected to the above-mentioned external recovery device 32 to realize the recycling of powder.

[0060] Preferably, the powder spray head 22 also includes a ceramic ball anti-suction rod 218, which is inserted into the accommodating cavity and located between the lower port of the third powder recovery pipe 217 and the ceramic ball 28 to prevent the ceramic ball 28 from blocking the third powder recovery pipe 217.

[0061] In addition, preferably, the powder spray head 22 may further include a buffer 219, which is disposed at the lower end of the powder spray head body 26. When the powder spray head 21 is brought up with the can cover and contacts the powder spray head 22, the buffer 219 can play a buffering effect to avoid crushing the can cover. Specifically, the upper end of the powder spray head body 26 is fixedly connected to the frame.

[0062] The working process of the powder spraying equipment of the present invention is as follows (1) and (2):

[0063] (1) During powder spraying: the workpiece to be powder sprayed (i.e., the iron can lid) enters the powder spraying position, the powder spraying head 21 rises, and the workpiece is positioned by the station positioning member 216; so that the powder spraying head 21, the can lid thereon, and the powder spraying pressure head 22 are pressed together, that is, the powder spraying head 21 is in a closed state, and the upper powder spraying lip 27 and the lower powder spraying lip 25 are respectively attached to the upper and lower surfaces of the can lid, which plays a role in sealing and preventing the powder from escaping, wherein the second opening of the upper powder spraying lip 27, the metal can lid hole, and the first opening of the lower powder spraying lip 25 are correspondingly arranged from top to bottom; at this time, the suction forces of the first powder recovery pipe 212, the second powder recovery pipe 213, and the third powder recovery pipe 217 are all in a weak vacuum state. In this state, the air flow carrying powder is ejected from the above-mentioned ejector through the powder supply pipe 210 and enters the powder spraying chamber 29. The high-voltage generator 214 provides high voltage to the high-voltage discharge needle 24. The high-voltage discharge needle 24 releases the charge in the powder spraying chamber 29. The powder ejected from the powder supply pipe 210 is charged when passing through the powder spraying chamber 29. Further, the charged powder is sprayed toward the area near the trimming of the metal can cover hole through the first opening of the lower powder spraying lip 25. At this time, the powder ejected from the first opening is blocked toward the trimming direction of the metal can cover hole by the ceramic ball 28 in the upper powder spraying lip 27. The ceramic ball 28 rotating and tumbling in the upper powder spraying lip 27 can effectively block the ejected powder back to the trimming circumference of the metal can cover hole. Fig.19As shown, the charged powder will be adsorbed on the cut edge and surrounding of the metal can cover hole to form a spray layer; and when the sprayed powder-carrying airflow is too large, the ceramic ball 28 can block it to adjust the pressure and flow rate, so that the cut edge of the metal can cover hole will not be effectively adhered to by the powder due to the excessive gas flow rate, thereby better ensuring that the powder covers the cut edge of the hole evenly.

[0064] (2) When powder spraying stops: The above powder spraying process is completed in a very short time. After powder spraying is completed, the powder spraying head 21 descends so that the powder spraying head 21, the powder spraying head 22 and the can cover are disengaged, that is, the powder spraying head 21 is in an open state, and the powder supply pipe 210 stops supplying powder. The suction force of the first powder recovery pipe 212 and the second powder recovery pipe 213 is switched to a strong vacuum state, so that the entire recovery chamber 211 maintains a negative pressure, and air enters the recovery chamber 211 from the first opening of the lower powder spraying lip 25. The powder in the recovery chamber 211 is recovered through the first powder recovery pipe 212 and the second powder recovery pipe 213; in addition, the third powder recovery pipe 212 of the powder spraying head 22 is closed. The suction force of 217 is also switched to a strong vacuum state. The third powder recovery tube 217 generates a strong suction force inside the powder spray head cavity (i.e., the receiving cavity), so that the ceramic balls 28 in the upper powder spray lip 27 are adsorbed around the ceramic ball anti-suction rod 218 (the function of the ceramic ball anti-suction rod 218 is to prevent the ceramic balls 28 from blocking the third powder recovery tube 217 and causing the powder spray head cavity to have no suction force). At this time, the second opening of the upper powder spray lip 27 is in an open state because there is no obstruction by the ceramic balls 28. Air enters the powder spray head cavity from the second opening of the upper powder spray lip 27, so that the powder in the powder spray head cavity is recovered by the third powder recovery tube 217 and cleaned.

[0065] In addition, if Fig. 20As shown, the present invention may also include a compressed gas tank 33, a fluidizing pressure regulating valve 34, a powder spraying pressure regulating valve 35, a powder spraying solenoid valve 36 and a blow needle pressure regulating valve 37. The compressed gas tank 33 is an external gas supply device. Specifically, (1) the compressed gas tank 33 is connected to the first fluidizing air inlet 113 and the second fluidizing air inlet 125 through the fluidizing pressure regulating valve 34. When the powder conveying device is feeding powder to the powder spraying equipment, the fluidizing pressure regulating valve 34 is opened, and when the powder conveying device stops feeding powder, the fluidizing pressure regulating valve 34 is closed. That is, by setting the fluidizing pressure regulating valve 34, the compressed gas tank 33 can be adjusted according to the powder conveying device. In the powder feeding state, the first microporous plate 112 and the second microporous plate 126 are intermittently supplied with gas; (2) in addition, the compressed gas tank 33 is connected to the above-mentioned blow needle gas joint 215 through the blow needle pressure regulating valve 37. When the powder spraying equipment is in the powder spraying state, the blow needle pressure regulating valve 37 is opened so that the blow needle gas joint 215 can blow away the powder attached to the high-voltage discharge needle 24; when the powder spraying equipment stops spraying, the blow needle pressure regulating valve 37 is closed, that is, by setting the blow needle pressure regulating valve 37, the compressed gas tank 33 can intermittently supply gas to the blow needle gas joint 215 according to the powder spraying state of the powder spraying equipment; (3) In addition, the compressed gas tank 33 is connected to the injector air inlet 123 through the powder spraying pressure regulating valve 35 and the powder spraying solenoid valve 36 to connect the air flow to the injector device 14. The powder conveying device of the present invention can cooperate with the powder spraying equipment to realize intermittent quantitative powder supply. The rotation angle of the motor 115 can be controlled by program so that the screw rod 118 can deliver a preset quantitative powder. The powder spraying pressure regulating valve 35 and the powder spraying solenoid valve 36 can also be controlled by program so that the powder supply time of the injector device 14 and the closing and opening time of the powder spraying head 21 of the powder spraying equipment are closely coordinated and synchronized. step; when the powder spraying head 21 is closed, that is, the powder spraying equipment is in the powder spraying state, the powder spraying pressure regulating valve 35 and the powder spraying solenoid valve 36 are opened by program control to connect the airflow to the injector device 14, thereby realizing powder feeding to the powder spraying head 21; when the powder spraying head 21 is opened, that is, the powder spraying equipment stops spraying powder, the powder spraying pressure regulating valve 35 and the powder spraying solenoid valve 36 are closed by program control to stop connecting the airflow to the injector device 14, thereby stopping powder feeding to the powder spraying head 21; the above-mentioned intermittent powder supply frequency can reach 50 times per minute. Compared with the prior art, the present invention can achieve better powder supply control effect.

[0066] Compared with the prior art, the present invention provides a powder conveying device having the following beneficial effects:

[0067] (1) The present invention is provided with a separator assembly, through which the powder entering the powder barrel with airflow is separated from the powder gas, so as to better avoid the problems of excessive gas accumulation in the powder barrel, excessive air pressure in the powder barrel, etc., to avoid affecting the storage of the powder in the powder barrel and the subsequent powder injection of the injector, etc., so as to better ensure the powder conveying effect. (2) The present invention is also provided with a powder spraying device, which is provided with a ceramic ball, which can better block the sprayed powder on the cut edge of the metal can cover hole, and the powder with electric charge will be adsorbed on the cut edge and the surrounding of the hole; when the sprayed powder-carrying airflow is too large, the ceramic ball plays a role in regulating pressure and flow, so that the cut edge of the hole will not be washed away by the adsorbed powder due to the excessive airflow speed, and the powder is better guaranteed to cover the cut edge of the hole evenly; in the above manner, the present invention can better solve the problem of powder covering the cut edge of the metal can cover hole, that is, better make the powder play a role in rust prevention for the metal can cover hole, so that the metal can cover can better meet the food safety requirements.

[0068] It should be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0069] Although embodiments of the present invention have been shown, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A powder conveying device, characterized in that: The invention comprises a separator assembly for powder-gas separation, a powder barrel for storing powder, a powder pump assembly for conveying powder and an injector device for spraying powder, wherein the separator assembly is provided with a first powder inlet, a first powder outlet and a gas reflux port, the interior of the powder barrel is provided with a powder receiving chamber, the powder barrel is provided with a second powder inlet communicating with the powder receiving chamber, the first powder outlet is connected with the second powder inlet, the powder pump assembly is provided with a second powder outlet, the injector device is provided with a powder chamber and a powder spraying port which are connected to each other, and the second powder outlet communicates the powder receiving chamber with the powder spraying port.

2. The powder conveying device according to claim 1, characterized in that: The separator assembly includes a powder-gas separator, a balancer and a connecting pipe, the balancer is located above the powder-gas separator, the interior of the balancer is connected to the interior of the powder-gas separator through the connecting pipe, the first powder inlet is arranged near the top of the powder-gas separator, the first powder outlet is arranged at the bottom of the powder-gas separator, the gas reflux port is arranged on the connecting pipe, and the second powder inlet is arranged at the top of the powder barrel.

3. The powder conveying device according to claim 2, characterized in that: The balancer comprises a shell and a powder filter tube, wherein the powder filter tube is arranged inside the shell, the powder filter tube is connected to the connecting tube, and the shell is provided with a through hole.

4. The powder conveying device according to claim 2, characterized in that: The powder-gas separator is in the shape of a conical cylinder.

5. The powder conveying device according to claim 1, characterized in that: A first microporous plate is provided inside the powder barrel, and the first microporous plate is arranged close to the bottom end of the powder barrel. A first fluidization air inlet connected to the first microporous plate is provided on the outer wall of the powder barrel.

6. The powder conveying device according to claim 1, characterized in that: The outer wall of the powder barrel is provided with a powder cleaning pipe, and the powder cleaning pipe is provided with a powder extraction port.

7. The powder conveying device according to claim 1, characterized in that: The powder pump assembly includes a motor, a driving gear, a screw seat and a screw rod, the motor and the driving gear are both arranged on the outer wall of the powder barrel, the screw rod is arranged on the screw seat, one end of the screw rod is located in the powder receiving chamber, and the other end of the screw rod is connected to the motor through the driving gear, and a third powder outlet connected to the second powder outlet is provided at the bottom of the screw seat, and the second powder outlet is arranged close to the screw rod.

8. The powder conveying device according to claim 7, characterized in that: The injector device comprises an injector seat, an injector and a powder spraying part, the powder spraying part and the injector are respectively arranged at the front end and the rear end of the injector seat, the powder spraying part and the injector are both arranged near the bottom of the injector seat, the powder chamber is arranged at the upper part of the injector seat, the top of the powder chamber is provided with a third powder inlet connected with the third powder outlet, the bottom of the powder chamber is provided with a fourth powder outlet, the powder spraying part and the injector are arranged near the fourth powder outlet, the rear end of the injector is connected with an injector air inlet, the front end of the injector is arranged near the rear end of the powder spraying part, the powder spraying port is located at the front end of the powder spraying part, and the powder spraying port is connected with a powder pipe joint.

9. The powder conveying device according to claim 8, characterized in that: A second fluidizing air inlet is provided at the bottom of the injector seat, a second microporous plate is provided on the second fluidizing air inlet, and the second microporous plate is arranged close to the rear end of the powder spraying member.

10. The powder conveying device according to claim 9, characterized in that: A first air pipe joint is provided on the top of the powder barrel, and a second air pipe joint is provided on the top of the screw seat. The first air pipe joint and the second air pipe joint are connected through an air inlet pipe.

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