Automatic powder spraying equipment for metal can cover hole

Abstract

The invention discloses automatic powder spraying equipment for a metal can cover hole. The automatic powder spraying equipment comprises a powder spraying head and a powder spraying pressing head. The high-voltage spray point is arranged to discharge in the powder spraying cavity, powder is charged with high-voltage charges when passing through the powder spraying cavity, the charged powder is sprayed to the area near the cutting edge of the metal can cover hole through the lower powder spraying lip and is adsorbed on a notch, and the ceramic ball is arranged to well block the sprayed powder on the cutting edge of the metal can cover hole. Powder with charges can be adsorbed on the cut edges and the peripheries of the holes; when the sprayed airflow with powder is too large, the ceramic ball plays a role in regulating pressure and flow, so that the situation that the adsorbed powder is washed away by the cut edge of the hole due to the too large airflow speed is avoided, and it is well guaranteed that the cut edge of the hole is evenly covered with the powder; according to the metal can cover, the covering problem of powder on the cut edge of the metal can cover hole can be well solved, that is, the powder can well play an anti-rust role on the metal can cover hole, and therefore the metal can cover can well meet the food safety requirement.

Description

Technical Field

[0001] The invention relates to the technical field of spraying in can making industry, in particular to automatic powder spraying equipment for metal can cover holes. Background Art

[0002] In the food can manufacturing industry, in order to facilitate customers who buy food to quickly open the food can, the food can manufacturing industry has invented a high vacuum pressing sealing method. In order to quickly open the high vacuum food can, a small hole is punched in the iron metal cover of the food can and covered with a small piece of easy-to-tear film. When eating, just pull the small piece of easy-to-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, but the inner surface of the small hole formed by punching is exposed and not protected, so the moisture contained in the food inside plus the gas in the can will quickly cause the cut surface to rust and contaminate the food inside. This is an international technical problem in this field. In order to solve this technical problem, the present application adopts a method of powder spraying the small hole to protect the inner surface.

[0003] However, the prior art currently does not have any equipment or structure specifically for powder spraying to prevent rust on the cut edges of metal can cover holes. The prior art cannot evenly spray powder on the cut edges of metal can cover holes, that is, there is a problem of powder covering the cut edges of metal can cover holes, that is, the powder cannot effectively prevent rust on the metal can cover holes. The present application develops a new special powder spraying mechanism, which enables the powder to effectively cover the inner cut surface of the small hole to prevent corrosion. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] In view of the deficiencies in the prior art, the present invention provides an automatic powder spraying device for metal can cover holes, which 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: an automatic powder spraying device for metal can cover holes, comprising a powder spraying head and a powder spraying pressure head, the powder spraying head can be moved up and down, and the powder spraying pressure head is fixedly arranged above the powder spraying head, wherein the powder spraying head comprises a powder spraying head body, a high-voltage discharge needle and a lower powder spraying lip, and the powder spraying pressure head comprises a powder spraying pressure head body, an upper powder spraying lip and a ceramic ball; the lower powder spraying lip is arranged at the upper end of the powder spraying head body, the upper end of the lower powder spraying lip is provided with a first opening, the interior of the powder spraying head body is provided with a powder spraying cavity, the first opening is connected to the powder spraying cavity, the high-voltage discharge needle is arranged in the powder spraying cavity, and the lower end of the powder spraying cavity is connected with a powder supply pipe; the upper powder spraying lip is arranged at the lower end of the powder spraying pressure head body, the interior of the upper powder spraying lip is provided with a receiving cavity, the lower end of the receiving cavity is provided with a second opening, the ceramic ball is received in the receiving cavity, the diameter of the ceramic ball is larger than the aperture of the second opening, and the second opening and the first opening are arranged correspondingly up and down.

[0008] Preferably, a recovery chamber is further provided inside the powder spray head body, the first opening is communicated with the recovery chamber, and a powder recovery pipe is connected to the lower end of the recovery chamber.

[0009] Preferably, the lower end of the recovery chamber is specifically connected to a first powder recovery pipe and a second powder recovery pipe.

[0010] Preferably, the powder spray head further comprises a high voltage generator, which is arranged inside the powder spray head body and connected to the high voltage discharge needle.

[0011] Preferably, the powder spray head also includes a blow needle air joint, which is arranged outside the powder spray head body, a mounting tube is arranged in the powder spray chamber, the high-voltage discharge needle part is arranged inside the mounting tube, and the blow needle air joint is connected to the inside of the mounting tube.

[0012] Preferably, the powder spray head further comprises a station positioning piece, and the station positioning piece is arranged at the upper end of the powder spray head body.

[0013] Preferably, the powder spray head further comprises a third powder recovery pipe, which is arranged inside the powder spray head body and communicated with the accommodating chamber.

[0014] Preferably, the powder spray head further comprises a ceramic ball anti-absorption rod, which is passed through the accommodating cavity and is located between the lower port of the third powder recovery pipe and the ceramic ball.

[0015] Preferably, the powder spray head further comprises a buffer, which is arranged at the lower end of the powder spray head body.

[0016] Preferably, the upper end of the powder spray head body is fixedly connected to the frame.

[0017] (III) Beneficial effects

[0018] Compared with the prior art, the present invention provides an automatic powder spraying device for metal can cover holes, which has the following beneficial effects: the present invention is provided with a high-voltage discharge needle to discharge in a powder spraying chamber, and the powder is charged with a high-voltage charge when passing through the powder spraying chamber. The charged powder is sprayed to the area near the cut edge of the metal can cover hole through the lower powder spraying lip and is adsorbed on the cut edge, and the present invention 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 a 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 the pressure and flow rate, so that the cut edge of the hole will not wash away the adsorbed powder due to the excessive airflow speed, and better ensure that the powder covers 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 enable the powder to play a role in rust prevention for the metal can cover hole, so that the metal can cover can better meet the food safety needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A front view of an automatic powder spraying device for metal can cover holes of the present invention (showing a high voltage generator);

[0020] Figure 2 for Figure 1 The cross-section along the BB direction;

[0021] Figure 3 Another front view of an automatic powder spraying device for metal can cover holes of the present invention;

[0022] Figure 4 A three-dimensional diagram of an automatic powder spraying device for metal can cover holes of the present invention;

[0023] Figure 5 It is a partial structural cross-sectional view of an automatic powder spraying device for metal can cover holes of the present invention;

[0024] Figure 6 It is a three-dimensional image of a metal can lid;

[0025] Figure 7 It is a top view of a metal can lid;

[0026] Figure 8 The cross-sectional view of the sprayed layer obtained by powder spraying the holes of a metal can cover using the present invention.

[0027] The numbers in the figure are: 1 powder spray head, 2 powder spray pressure head, 3 powder spray head body, 4 high-voltage discharge needle, 5 lower powder spray lip, 6 powder spray pressure head body, 7 upper powder spray lip, 8 ceramic ball, 9 powder spray chamber, 10 powder supply pipe, 11 recovery chamber, 12 first powder recovery pipe, 13 second powder recovery pipe, 14 high-voltage generator, 15 blow needle air joint, 16 station positioning piece, 17 third powder recovery pipe, 18 ceramic ball anti-suction rod, 19 buffer, 20 joint, 21 mounting frame. DETAILED DESCRIPTION

[0028] 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.

[0029] The present invention provides an automatic powder spraying device for metal can cover holes, comprising a powder spraying head 1 and a powder spraying head 2. The powder spraying head 1 can be moved up and down, and the powder spraying head 1 can be fixedly arranged on a mechanism that can move up and down through a mounting frame 21 and other structural parts; the powder spraying head 2 is fixedly arranged above the powder spraying head 1. When there is a cover, the powder spraying head 1 lifts the iron metal can cover to the bottom of the powder spraying head and presses the upper powder spraying lip 7 and the lower powder spraying lip 5 against the upper and lower surfaces of the can cover. Among them, the powder spraying head 1 includes a powder spraying head body 3, a high-voltage discharge needle 4 and a lower powder spraying lip 5, and the powder spraying head 2 includes a powder spraying head body 6, an upper powder spraying lip 7 and a ceramic ball 8.

[0030] The lower powder spray lip 5 is arranged at the upper end of the powder spray head body 3, and a first opening is provided at the upper end of the lower powder spray lip 5. A powder spray chamber 9 is provided inside the powder spray head body 3, and the first opening is connected to the powder spray chamber 9. The high-voltage discharge needle 4 is arranged in the powder spray chamber 9, and a powder supply pipe 10 is connected to the lower end of the powder spray chamber 9.

[0031] The upper powder spray lip 7 is arranged at the lower end of the powder spray head body 6, and a receiving cavity is provided inside the upper powder spray lip 7. A second opening is provided at the lower end of the receiving cavity. The ceramic ball 8 is received in the receiving cavity. The diameter of the ceramic ball 8 is larger than the aperture of the second opening to avoid the ceramic ball 8 from falling from the second opening, and the diameter of the ceramic ball 8 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.

[0032] Preferably, a recovery chamber 11 is further provided inside the powder spray head body 3, the first opening is communicated with the recovery chamber 11, and a powder recovery pipe is connected to the lower end of the recovery chamber 11; in this embodiment, the lower end of the recovery chamber 11 is specifically connected to a first powder recovery pipe 12 and a second powder recovery pipe 13, that is, the recovery chamber 11 is connected to two powder recovery pipes to achieve a better powder recovery effect, and the first powder recovery pipe 12 and the second powder recovery pipe 13 are respectively located on both sides of the recovery chamber 11. In addition, various joints 20 can be provided outside the powder spray head body 3 to respectively connect the above-mentioned powder supply pipe 10, the first powder recovery pipe 12, and the second powder recovery pipe 13, so that the powder supply pipe 10 can be conveniently connected to an external powder supply device, etc.

[0033] Specifically, the powder spray head 1 further includes a high voltage generator 14 , which is disposed inside the powder spray head body 3 and connected to the high voltage discharge needle 4 , and is used to provide high voltage to the high voltage discharge needle 4 .

[0034] Preferably, the powder spray head 1 also includes a blow needle air joint 15, which is arranged on the outside of the powder spray head body 3, and a mounting tube is provided in the powder spray chamber 9, and the high-voltage discharge needle 4 is partially arranged inside the mounting tube. The blow needle air joint 15 is connected to the inside of the mounting tube. It can be understood that the blow needle air joint 15 is connected to the external air supply device, and the mounting tube is blown through the blow needle air joint 15 to blow away the powder attached to the high-voltage discharge needle 4, thereby better ensuring the use effect of the high-voltage discharge needle 4.

[0035] Preferably, the powder spray head 1 also includes a station positioning member 16, which is arranged at the upper end of the powder spray head body 3. The station positioning member 16 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 member of the prior art can be used and no excessive restrictions are made here.

[0036] In this embodiment, the powder injection head 2 further comprises a third powder recovery pipe 17, which is disposed inside the powder injection head body 6 and is connected to the receiving chamber to recover the powder entering the receiving chamber.

[0037] Preferably, the powder spray head 2 also includes a ceramic ball anti-absorption rod 18, which is inserted into the accommodating cavity and located between the lower port of the third powder recovery pipe 17 and the ceramic ball 8 to prevent the ceramic ball 8 from blocking the third powder recovery pipe 17.

[0038] In addition, preferably, the powder spray head 2 may further include a buffer 19, which is disposed at the lower end of the powder spray head body 6. When the powder spray head 1 is brought up with the can cover and contacts the powder spray head 2, the buffer 19 can play a buffering effect to avoid crushing the can cover. Specifically, the upper end of the powder spray head body 6 is fixedly connected to the frame.

[0039] The working process of the automatic powder spraying equipment for metal can cover holes of the present invention is as follows (1) and (2):

[0040] (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 1 rises, and the workpiece is positioned by the station positioning member 16; so that the powder spraying head 1, the can lid thereon, and the powder spraying pressure head 2 are pressed together, and the upper powder spraying lip 7 and the lower powder spraying lip 5 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. Among them, the second opening of the upper powder spraying lip 7, the metal can lid hole, and the first opening of the lower powder spraying lip 5 are correspondingly arranged from top to bottom; at this time, the suction of the first powder recovery pipe 12, the second powder recovery pipe 13, and the third powder recovery pipe 17 are all in a weak vacuum state. The air flow carrying powder is ejected from the powder supply pipe 10 and enters the powder spraying chamber 9. The high-voltage generator 14 provides high voltage to the high-voltage discharge needle 4. The high-voltage discharge needle 4 releases the charge in the powder spraying chamber 9. The powder ejected from the powder supply pipe 10 is charged when passing through the powder spraying chamber 9. 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 5. 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 8 in the upper powder spraying lip 7. The ceramic ball 8 rotating and tumbling in the upper powder spraying lip 7 can effectively block the ejected powder back to the trimming circumference of the metal can cover hole. Figure 8 As 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 8 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.

[0041] (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 1 descends so that the powder spraying head 1, the powder spraying head 2 and the tank cover are disengaged, the powder supply pipe 10 stops supplying powder, and the suction of the first powder recovery pipe 12 and the second powder recovery pipe 13 are switched to a strong vacuum state, so that the entire recovery chamber 11 maintains a negative pressure, and air enters the recovery chamber 11 from the first opening of the lower powder spraying lip 5. The powder in the recovery chamber 11 is recovered through the first powder recovery pipe 12 and the second powder recovery pipe 13; in addition, the suction of the third powder recovery pipe 17 of the powder spraying head 2 is also switched to a strong vacuum state. Switch to a strong vacuum state, and a strong suction force is generated inside the powder spray head cavity (i.e., the receiving cavity) due to the third powder recovery pipe 17, so that the ceramic balls 8 in the upper powder spray lip 7 are adsorbed around the ceramic ball anti-suction rod 18 (the function of the ceramic ball anti-suction rod 18 is to prevent the ceramic balls 8 from blocking the third powder recovery pipe 17 and causing the powder spray head cavity to have no suction force). At this time, the second opening of the upper powder spray lip 7 is in an open state because there is no obstruction by the ceramic balls 8, and air enters the powder spray head cavity from the second opening of the upper powder spray lip 7, so that the powder in the powder spray head cavity is recovered by the third powder recovery pipe 17 and cleaned.

[0042] Among them, the upper powder spraying lip 7 and the lower powder spraying lip 5 are in direct contact with the metal can cover, so they need to be resistant to high temperature, have good sealing and meet food safety requirements. Preferably, the upper powder spraying lip 7 and the lower powder spraying lip 5 are made of a silicone base material and a curing agent mixed in a certain proportion, and are made by injection molding with a customized mold. The powder spraying lips can withstand a high temperature of 300°C and meet food safety requirements. In addition, preferably, during the powder spraying process, the metal can cover is grounded through the buffer 19; and the above-mentioned high-voltage discharge needle 4 releases 30,000-100,000 volts of high-voltage static electricity, so that the powder with high-voltage static electricity is better adsorbed on the cut edge of the metal can cover hole, thereby improving the powder spraying effect.

[0043] Compared with the prior art, the present invention provides an automatic powder spraying device for metal can cover holes, which has the following beneficial effects: (1) The present invention is provided with a high-voltage discharge needle to discharge in the powder spraying chamber, and the powder is charged with a high-voltage charge when passing through the powder spraying chamber. The charged powder is sprayed to the area near the cut edge of the metal can cover hole through the lower powder spraying lip and is adsorbed on the cut edge. In addition, the present invention 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 charged powder will be adsorbed on the cut edge and the surrounding area of ​​the hole; when the sprayed powder-carrying airflow is too large, the ceramic ball plays a role in regulating the pressure and flow rate, 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 enable the powder to 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. (2) The ceramic ball has good properties such as high temperature resistance, corrosion resistance, and high compressive strength, thereby ensuring its use effect and service life. (3) The automatic powder spraying equipment of the present invention can be applied to the production of automated production lines.

[0044] 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.

[0045] Although embodiments of the present invention have been shown and described, 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. An automatic powder spraying equipment for metal can cover holes, characterized in that: It includes a powder spray head and a powder spray pressure head, the powder spray head can be moved up and down, the powder spray pressure head is fixedly arranged above the powder spray head, wherein the powder spray head includes a powder spray head body, a high-voltage discharge needle and a lower powder spray lip, and the powder spray pressure head includes a powder spray pressure head body, an upper powder spray lip and a ceramic ball; The lower powder spray lip is arranged at the upper end of the powder spray head body, the upper end of the lower powder spray lip is provided with a first opening, a powder spray cavity is arranged inside the powder spray head body, the first opening is communicated with the powder spray cavity, the high-voltage discharge needle is arranged in the powder spray cavity, and the lower end of the powder spray cavity is connected with a powder supply pipe; The upper powder spray lip is arranged at the lower end of the powder spray head body, and a receiving cavity is arranged inside the upper powder spray lip. A second opening is arranged at the lower end of the receiving cavity. The ceramic ball is accommodated in the receiving cavity. The diameter of the ceramic ball is larger than the aperture of the second opening. The second opening and the first opening are arranged correspondingly up and down.

2. The automatic powder spraying equipment for metal can cover holes according to claim 1, characterized in that: A recovery chamber is also provided inside the powder spray head body, the first opening is communicated with the recovery chamber, and a powder recovery pipe is connected to the lower end of the recovery chamber.

3. The automatic powder spraying equipment for metal can cover holes according to claim 2, characterized in that: The lower end of the recovery chamber is specifically connected with a first powder recovery pipe and a second powder recovery pipe.

4. The automatic powder spraying equipment for metal can cover holes according to claim 1, characterized in that: The powder spray head further comprises a high voltage generator, which is arranged inside the powder spray head body and connected to the high voltage discharge needle.

5. The automatic powder spraying equipment for metal can cover holes according to claim 1, characterized in that: The powder spray head also includes a blow needle air joint, which is arranged outside the powder spray head body, a mounting tube is arranged in the powder spray chamber, the high-voltage discharge needle part is arranged inside the mounting tube, and the blow needle air joint is connected to the inside of the mounting tube.

6. The automatic powder spraying equipment for metal can cover holes according to claim 1, characterized in that: The powder spray head further comprises a station positioning member, and the station positioning member is arranged at the upper end of the powder spray head body.

7. The automatic powder spraying equipment for metal can cover holes according to claim 2, characterized in that: The powder spray head further includes a third powder recovery pipe, which is disposed inside the powder spray head body and communicates with the receiving chamber.

8. The automatic powder spraying equipment for metal can cover holes according to claim 7, characterized in that: The powder spray head also includes a ceramic ball anti-absorption rod, which is inserted into the receiving cavity and located between the lower port of the third powder recovery pipe and the ceramic ball.

9. The automatic powder spraying equipment for metal can cover holes according to claim 1, characterized in that: The powder spray head further comprises a buffer component, and the buffer component is arranged at the lower end of the powder spray head body.

10. The automatic powder spraying equipment for metal can cover holes according to claim 1, characterized in that: The upper end of the powder spray head body is fixedly connected to the frame.

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