Automatic screening system for defective products of surface coatings of metal packaging cans

Abstract

The utility model discloses an automatic screening system for defective products of surface coatings of metal packaging cans, which comprises a coating detection device, a bottle holding and conveying device, a defective product removing device and a controller. The turntable bottle-holding mechanism comprises a fixed bracket and a bottle-holding rotating part which is rotatably arranged on the fixed bracket; the multi-channel conduction detection mechanism is arranged on the fixing support and comprises a position adjusting part and a multi-channel detection part arranged on the position adjusting part, the multi-channel detection part is provided with a detection channel allowing a metal bottle to pass through, and at least one contact type conduction induction needle is arranged at the position of the detection channel; the bottle holding and conveying device is arranged between the coating detection device and the defective product removing device, and the coating detection device, the bottle holding and conveying device and the defective product removing device are electrically connected with the controller. The device has the beneficial effects that defective products without coatings are accurately rejected, and the coating missing area of metal bottles without coating defects is accurately judged.

Description

Technical Field

[0001] The utility model belongs to the technical field of metal can production and detection, in particular to an automatic screening system for defective surface coatings of metal packaging cans. Background Art

[0002] Aluminum bottles are a new type of food and beverage packaging container, which is light, easy to store, easy to transport, not easy to damage, and has no risk of explosion and injury. By applying a high-density polymer coating layer on the base of the aluminum bottle, the aluminum bottle has a wider range of product packaging adaptability, such as the function of packaging water-based beverages, alcoholic beverages, and solvent products. It is easy to carry, the packaging products are safe and reliable, and it is more suitable for daily beverage packaging. Compared with glass bottles, aluminum bottles have extremely high light-shielding properties and have the effect of light isolation, thereby increasing the shelf life of the packaged products and stabilizing the taste and quality of food and beverages. Compared with glass bottles, aluminum bottles have obvious advantages in the display of new technologies such as printing graphics and text presentation effects and aluminum bottle surface relief effects. However, as an important packaging product in the metal packaging industry, surface coating protection is one of the effective technical measures to protect aluminum bottle packaging from environmental corrosion and oxidation. The aluminum bottle product adopts a process of first forming a cylindrical barrel body, then applying inner and outer coatings, and finally necking the bottle mouth. The outer coating of the bottle body adopts the process of circumferential roller coating. The integrity of the roller coating will affect the processing and use performance of the bottle body's neck shrinking molding process. The surface coating protection technology of aluminum bottle packaging refers to the use of coating materials to protect metal packaging from corrosion and maintain its original durability and aesthetics.

[0003] In order to achieve effective metal packaging coating anti-corrosion, it is necessary to comprehensively consider factors such as metal surface roughness, coating material selection, coating process control, maintenance and use, and rapid identification of equipment. Due to the influence of various factors, uncoated cans occasionally appear. The defective cans cannot be identified by existing detection devices and manual labor on the production line, and the defective products produced flow into the market, affecting the quality of the product and causing greater quality risks.

[0004] Therefore, there is an urgent need for a device that does not require manual operation and can accurately detect coating defects produced by the metal bottle roller coating process and cannot remove coating defects. Summary of the invention

[0005] In view of the shortcomings of the prior art mentioned above, the purpose of the utility model is to provide an automatic screening system for defective surface coatings of metal packaging cans, which is used to solve the problem that the existing equipment is unable to timely detect coating defects caused by the metal bottle rolling process and is unable to remove coating defects.

[0006] The utility model proposes an automatic screening system for defective coatings on the surface of metal packaging cans, which is characterized by comprising a coating detection device, a bottle holding and conveying device located below the coating detection device, a defective rejection device arranged on the bottle holding and conveying device, and a controller arranged on the coating detection device, wherein the coating detection device comprises a turntable bottle holding mechanism and a multi-channel conduction detection mechanism, wherein the turntable bottle holding mechanism comprises a fixed bracket and a bottle holding rotating part rotatably arranged on the fixed mechanism, which is used to receive and fix the metal bottle and provide detection support for the multi-channel conduction detection mechanism; the multi-channel conduction detection mechanism is arranged on the fixed bracket, comprises a position adjustment part and a multi-channel detection part arranged on the position adjustment part, wherein the multi-channel detection part has a detection channel for the metal bottle to pass through, wherein at least one contact conduction sensing needle is arranged at the detection channel, and when the metal bottle passes through the detection channel, the outer surface of the metal bottle contacts the contact conduction sensing needle; the bottle holding and conveying device is arranged between the coating detection device and the defective rejection device, and the coating detection device, the bottle holding and conveying device, and the defective rejection device are electrically connected to the controller respectively.

[0007] Preferably, the bottle holding rotating part includes a work station turntable and an import station, an inspection station, and an export station arranged along the circumferential direction of the work station turntable, the work station turntable is rotatably arranged on the fixed bracket, the work station turntable has a first surface and a second surface that are opposite to each other, and a plurality of work station core shafts arranged axially along the work station turntable are equidistantly arranged on the first surface; a self-rotation driving device is provided at the inspection station, and the driving shaft of the self-rotation driving device is connected with the work station core shaft moved to the inspection station through a clutch, so as to drive the work station core shaft moved to the inspection station to rotate around its axis to cooperate with the multi-channel conduction detection unit to carry out conduction detection on the circumferential surface of the metal bottle.

[0008] Preferably, the multi-channel conduction detection mechanism includes a positioning bracket, an axial sliding bracket and a plurality of contact conduction sensing needles, the positioning bracket is mounted on the fixed bracket, and the positioning bracket is provided with a slide groove arranged along the axial direction of the workstation turntable; one end of the axial sliding bracket is slidably inserted in the slide groove, and the other end is provided with two detection arms arranged along the axis of the workstation turntable and parallel to each other, and a detection channel for the metal bottle to pass through is formed between the two detection arms; every two of the contact conduction sensing needles form a group and are symmetrically arranged at the detection channel; the contact conduction sensing needle has an elastic metal detection head, and the elastic metal detection head contacts the metal bottle moved to the detection station, and the contact conduction sensing needle is electrically connected to the controller.

[0009] Preferably, the number of groups of the contact-type conduction sensing needles is 2 to 10, and they are arranged on both sides of the detection channel.

[0010] Preferably, the bottle holding and conveying device is provided with an input station and a rejection station in sequence along the conveying direction of the metal bottle; the input station is located below the output station and is used to receive the metal bottles unloaded from the output station; the rejection station is located at the defective rejection device.

[0011] Preferably, the bottle holding and conveying device is a chain conveyor, a roller conveyor or a ratchet roller conveyor.

[0012] Preferably, the bottle holding and conveying device is a chain conveyor, comprising a frame, an endless belt, a driving motor, a driving wheel and a passive wheel, the driving wheel and the passive wheel are rotatably mounted at both ends of the frame, and the driving wheel is connected to the shaft end of the driving motor; the endless belt is wrapped around the outside of the driving wheel and the passive wheel and tensioned, and the outer surface of the endless belt is provided with Y-shaped chain plates at equal intervals.

[0013] Preferably, the defective product rejection device includes a bracket, a pneumatic rejection actuator, a solenoid valve and a compressed air generator, wherein the bracket is mounted on the bottle holding and conveying device; the pneumatic rejection actuator is mounted on the bracket, and the solenoid valve of the pneumatic rejection actuator has an air flow nozzle, which is aimed at the rejection station of the bottle holding and conveying device and is used to reject defective metal packaging cans with defective surface coatings transported on the bottle holding and conveying device; the control end of the solenoid valve is electrically connected to the controller, the air outlet of the solenoid valve is connected to the air inlet of the pneumatic rejection actuator, the air inlet of the solenoid valve is connected to the compressed air generator through an air pipe, and the solenoid valve is connected to the controller.

[0014] Preferably, the defective product rejection device is also provided with an alarm, which is electrically connected to the controller and is used to receive an alarm signal from the controller to generate an alarm.

[0015] Preferably, the automatic screening system further comprises an integrated operation display screen, which is electrically connected to the controller and is used to display the alarm frequency to prompt the operator.

[0016] The method for screening by using the automatic screening system for defective metal packaging can surface coatings of the utility model is characterized by comprising the following steps:

[0017] Load the metal bottles from the inlet station to the station mandrel of the working turntable in sequence;

[0018] The metal bottle revolves with the working turntable to the inspection station, and the rotation drive device connects with the station mandrel through the clutch, driving the station mandrel at the inspection station to rotate to drive the metal bottle to rotate;

[0019] The multi-channel conduction detection mechanism starts to perform conduction detection on the metal bottles at the detection station to determine whether the metal bottles are coated. If it is determined that the metal bottles are coated, the defective rejection device will not work. After the metal bottles are unloaded from the export station, they are directly output through the bottle holding and conveying device for the printing, drying and necking processes, and then packaged and put into storage. If it is determined that at least part of the metal bottle is not coated, the defective rejection device will operate to reject the defective surface coating of the metal packaging cans conveyed to the rejection station, and the alarm will sound at the same time.

[0020] Preferably, determining whether the metal bottle has a coating is performed according to the following steps:

[0021] The surface of the metal bottle at the detection station contacts the contact-type conduction sensing needle. If the contact-type conduction sensing needle conducts current, the controller receives a conduction signal and determines it as an uncoated metal can. At the same time, the uncoated area and range are determined based on the number of conduction groups of the contact-type conduction sensing needle. If the contact-type conduction sensing needle does not conduct current, the controller does not receive a conduction signal and determines it as a coated metal can.

[0022] Specifically, the working turntable rotates, and the metal bottle moves from the import station to the inspection station. The self-rotation drive device connects with the station spindle at the inspection station through the clutch to drive the station spindle to rotate. During the rotation of the station spindle, the surface of the metal bottle is always in contact with the elastic metal detection head of the contact-type conductive sensing needle. If the surface of the metal bottle at the inspection station is uncoated, the elastic metal detection head conducts current. After receiving the conduction signal, the controller identifies it as an uncoated metal can. Then, according to the number of conduction groups of the elastic metal detection head, the uncoated area and range can be determined. Through the judgment of the controller, it is finally transmitted to the alarm, and an alarm and a rejection signal are respectively sent to the alarm and the defective rejection device; the defective rejection device starts to work with a delay, and the compressed air generator blows air to the defective coating on the surface of the metal packaging can transported to the rejection station to reject abnormal metal bottle packaging workpieces, and the alarm receives the number of groups of missing coating sensor signals from the controller, prompts the operator through the alarm frequency, and displays it on the integrated operation display screen.

[0023] The beneficial effects of the utility model are: it can accurately reject uncoated defective products and accurately judge the coating missing area of ​​metal bottles without coating defects; it has the function of sensitivity adjustment, and the adjustment is fast, so as to realize accurate judgment of no coating; through the automatic detection of no primer device, the recognition accuracy is high, the skill requirements for operating personnel are low, and the operation difficulty is low; it has the characteristics of accurate and fast response, is suitable for products with incomplete coating in the circumferential direction, and has low requirements for operators; it can quickly and accurately judge the position and range of circumferential no coating defects. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Shown is a flow chart of the screening method of the present utility model.

[0025] Figure 2 Shown is a structural diagram of the utility model.

[0026] Figure 3 Shown is a structural diagram of the coating detection device of the present utility model.

[0027] Figure 4 Shown is the process route diagram for the uncoated metal bottle of the utility model.

[0028] Among them, 1. coating detection device; 11. turntable bottle holding mechanism; 111. fixed bracket; 112. station turntable; 113. import station; 114. detection station; 115. export station; 116. station core shaft; 117. self-rotation drive device; 12. multi-channel conduction detection mechanism; 121. position adjustment part; 1211. positioning bracket; 1212. axial sliding frame; 1213. detection arm; 122. contact conduction sensing needle; 2. bottle holding and conveying device; 21. frame; 22. annular belt; 23. driving motor; 24. driving wheel; 25. passive wheel; 3. defective rejection device; 31. bracket; 32. pneumatic rejection actuator; 33. solenoid valve; 34. compressed air generator; 35. alarm; 4. controller; 5. metal bottle. DETAILED DESCRIPTION

[0029] The following describes the implementation of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. The present application can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application.

[0030] It should be noted that the process equipment or devices not specifically specified in the following embodiments are all conventional equipment or devices in the art.

[0031] In addition, it should be understood that one or more method steps mentioned in this application do not exclude the existence of other method steps before or after the combination step or the insertion of other method steps between these explicitly mentioned steps, unless otherwise specified; it should also be understood that the combination connection relationship between one or more devices / apparatuses mentioned in this application does not exclude the existence of other devices / apparatuses before or after the combination device / apparatus or the insertion of other devices / apparatuses between these two explicitly mentioned devices / apparatuses, unless otherwise specified. Moreover, unless otherwise specified, the numbering of each method step is only a convenient tool for identifying each method step, and is not intended to limit the order of arrangement of each method step or the scope of implementation of this application. Changes or adjustments in their relative relationships shall also be regarded as the scope of implementation of this application without substantial changes in the technical content.

[0032] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0033] In the description of the present application, it should be understood that the terms "upper", "lower", "left", "right", "inner", "outer", "axial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, "multiple" means two or more.

[0034] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0035] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0036] The present application is further described below in conjunction with specific embodiments, but the protection scope of the present application is not limited thereto.

[0037] The utility model proposes an automatic screening system for defective coatings on the surface of metal packaging cans, comprising a coating detection device 1, a bottle holding and conveying device 2 located below the coating detection device, a defective product rejection device 3 arranged on the bottle holding and conveying device, and a controller 4 arranged on the coating detection device, wherein the coating detection device 1 comprises a turntable bottle holding mechanism 11 and a multi-channel conduction detection mechanism 12, wherein the turntable bottle holding mechanism 11 comprises a fixed bracket 111 and a bottle holding rotating part rotatably arranged on the fixed mechanism, which is used to receive and fix the metal bottle and provide detection support for the multi-channel conduction detection mechanism; the multi-channel conduction detection mechanism 12 It is arranged on a fixed bracket 111, and includes a position adjustment part 121 and a multi-channel detection part arranged on the position adjustment part. The multi-channel detection part has a detection channel for the metal bottle to pass through. The detection channel is provided with at least one contact-type conduction sensing needle 122. When the metal bottle 5 passes through the detection channel, the outer surface of the metal bottle 5 contacts the contact-type conduction sensing needle 122; the bottle holding and conveying device 2 is arranged between the coating detection device 1 and the defective product rejection device 3, and the coating detection device 1, the bottle holding and conveying device 2, and the defective product rejection device 3 are electrically connected to the controller 4 respectively.

[0038] In some embodiments of the utility model, the bottle holding rotating part includes a station turntable 112 and an import station 113, an inspection station 114, and an export station 115 arranged along the circumferential direction of the station turntable. The station turntable 112 is rotatably arranged on the fixed bracket 111. The station turntable 112 has a first surface and a second surface that are separated from each other. A plurality of station core shafts 116 arranged axially along the station turntable are equidistantly arranged on the first surface; a self-rotation driving device 117 is provided at the inspection station 114, and the driving shaft of the self-rotation driving device 117 is connected to the station core shaft 116 moved to the inspection station through a clutch 118 and a coupling 119, so as to drive the station core shaft 116 moved to the inspection station to rotate around its axis to cooperate with the multi-channel conduction detection unit to carry out conduction detection of the circumferential surface of the metal bottle.

[0039] In some embodiments of the present invention, the position adjustment part 121 includes a positioning bracket 1211 and an axial sliding bracket 1212. The positioning bracket 1211 is installed on the fixed bracket 111. The positioning bracket 1211 is provided with a slide groove arranged along the axis direction of the station turntable; one end of the axial sliding bracket 1212 is slidably inserted in the slide groove, and the other end is provided with two detection arms 1213 arranged along the axis of the station turntable and parallel to each other, and a detection channel for the metal bottle to pass through is formed between the two detection arms 1213.

[0040] In some embodiments of the present invention, every two of the contact-type conduction sensing needles 122 form a group and are symmetrically arranged at the detection channel; the contact-type conduction sensing needles 122 have elastic metal detection heads, and the elastic metal detection heads contact the metal bottles that move to the detection station, and the contact-type conduction sensing needles are electrically connected to the controller.

[0041] In some embodiments of the present invention, the number of groups of the contact-type conduction sensing needles 122 is 2 to 10 groups. This embodiment takes 4 groups of 8 contact-type conduction sensing needles 122 as an example for demonstration. The contact-type conduction sensing needles 122 are symmetrically arranged on both sides of the detection channel.

[0042] In some embodiments of the utility model, the bottle holding and conveying device 2 is provided with an input station and a rejection station in sequence along the conveying direction of the metal bottle; the input station is located at the export station, for receiving the metal bottles 5 unloaded from the working turntable; the rejection station is located at the defective rejection device.

[0043] In some embodiments of the utility model, the bottle holding conveying device 2 is a chain conveyor, a roller conveyor or a ratchet roller conveyor, etc. In this embodiment, the bottle holding conveying device 2 is a chain conveyor, which includes a frame 21, an endless belt 22, a driving motor 23, a driving wheel 24 and a driven wheel 25, the driving wheel 24 and the driven wheel 25 are rotatably mounted at both ends of the frame 21, and the driving wheel 24 is connected to the shaft end of the driving motor 23; the endless belt 22 surrounds the outside of the driving wheel 24 and the driven wheel 25 and is tensioned, and the outer surface of the endless belt 22 is evenly spaced with Y-shaped chain plates 221.

[0044] In some embodiments of the utility model, the defective product rejection device 3 includes a bracket 31, a pneumatic rejection actuator 32, a solenoid valve 33 and a compressed air generator 34, wherein the bracket 31 is mounted on the bottle holding and conveying device 2; the pneumatic rejection actuator 32 is mounted on the bracket 31, and the solenoid valve of the pneumatic rejection actuator 32 has an air flow nozzle, which is aimed at the rejection station of the bottle holding and conveying device 2 and is used to reject defective metal packaging cans with defective surface coatings transported on the bottle holding and conveying device; the control end of the solenoid valve 33 is electrically connected to the controller, the air outlet of the solenoid valve 33 is connected to the air inlet of the pneumatic rejection actuator 32, the air inlet of the solenoid valve 33 is connected to the compressed air generator 34 through an air pipe, and the solenoid valve is connected to the controller.

[0045] In some embodiments of the present invention, the defective product rejection device 3 is further provided with an alarm 35, and the alarm 35 is electrically connected to the controller 4, and is used to receive an alarm signal from the controller to give an alarm.

[0046] In some embodiments of the present invention, the automatic screening system further comprises an integrated operation display screen, which is electrically connected to the controller and is used to display the alarm frequency to prompt an operator.

[0047] The method for screening using the automatic screening system for defective metal packaging can surface coatings of the utility model comprises the following steps:

[0048] S1 loads the metal bottle 5 from the introduction station 113 onto the working turntable 112;

[0049] S2 When the metal bottle 5 revolves with the working turntable 112 to the inspection station 114, the rotation drive device 117 connects with the station mandrel through the clutch, drives the station mandrel at the inspection station to rotate, thereby driving the metal bottle to rotate;

[0050] S3 The multi-channel conduction detection mechanism 12 starts to perform conduction detection on the metal bottles at the detection station to determine whether the metal bottle 5 has a coating. If it is determined that the metal bottle 5 has a coating, the defective rejection device 3 does not work. The metal bottle 5 is unloaded from the export station 115 and is directly output through the bottle holding and conveying device 2 for the printing, drying and necking processes, and then packaged and stored; if it is determined that at least part of the area of ​​the metal bottle 5 is not coated, the defective rejection device 3 is operated to reject the defective surface coating of the metal packaging cans conveyed to the rejection station, and the alarm 35 sounds an alarm at the same time.

[0051] In some embodiments of the present invention, determining whether the metal bottle has a coating is performed according to the following steps:

[0052] The surface of the metal bottle at the detection station contacts the contact-type conductive sensing needles. If at least one group of the contact-type conductive sensing needles conducts current, the controller receives a conduction signal and determines it as an uncoated metal can. At the same time, the uncoated area and range are determined based on the number and position of the conduction groups of the contact-type conductive sensing needles. If all the contact-type conductive sensing needles do not conduct current, the controller does not receive a conduction signal and determines it as a coated metal can.

[0053] Specifically, the working turntable 112 rotates, and the metal bottle 5 moves from the introduction station 113 to the detection station 114. The self-rotation driving device 117 docks with the station mandrel 115 at the detection station 114 through the clutch 118, and drives the station mandrel 115 at the detection station to rotate. During the self-rotation of the station mandrel 115, the surface of the metal bottle 5 is always in contact with the elastic metal detection head of the contact conduction sensing needle 122. If the surface of the metal bottle 5 at the detection station 114 is not coated, the elastic metal detection head conducts current. After the controller 4 receives the conduction signal, It is identified as an uncoated metal can, and then the uncoated area and range are determined based on the number of conduction groups and the position of the elastic metal detection head, and an alarm and a rejection signal are sent to the alarm 35 and the defective rejection device 3 with a delay; the defective rejection device 3 starts working with a delay, and the compressed air generator 34 blows air to the defective surface coating of the metal packaging cans transported to the rejection station to reject abnormal metal bottle packaging workpieces, while the alarm 35 receives the number of groups of missing coating sensor signals from the controller, prompts the operator through the alarm frequency, and displays it on the integrated operation display screen for the operator to watch.

[0054] The above examples are intended to illustrate the embodiments disclosed in the present utility model and should not be construed as limitations on the present utility model. In addition, the various modifications listed herein and the changes in the methods and compositions in the utility model are obvious to those skilled in the art without departing from the scope and spirit of the present utility model. Although the present utility model has been specifically described in conjunction with a variety of specific preferred embodiments of the present utility model, it should be understood that the present utility model should not be limited to these specific embodiments. In fact, various modifications as described above that are obvious to those skilled in the art to obtain the utility model should be included in the scope of the present utility model.

Claims

1. An automatic screening system for defective surface coatings of metal packaging cans, characterized by: The invention comprises a coating detection device, a bottle holding and conveying device located below the coating detection device, a defective rejection device arranged on the bottle holding and conveying device, and a controller arranged on the coating detection device. The coating detection device comprises a turntable bottle holding mechanism and a multi-channel conduction detection mechanism. The turntable bottle holding mechanism comprises a fixed bracket and a bottle holding rotating part rotatably arranged on the fixed mechanism, which is used to receive and fix the metal bottle and provide detection support for the multi-channel conduction detection mechanism. The multi-channel conduction detection mechanism is arranged on the fixed bracket, comprises a position adjustment part and a multi-channel detection part arranged on the position adjustment part, the multi-channel detection part has a detection channel for the metal bottle to pass through, at least one contact conduction sensing needle is arranged at the detection channel, and when the metal bottle passes through the detection channel, the outer surface of the metal bottle contacts the contact conduction sensing needle. The bottle holding and conveying device is arranged between the coating detection device and the defective rejection device, and the coating detection device, the bottle holding and conveying device, and the defective rejection device are electrically connected to the controller respectively.

2. The automatic screening system for defective surface coating of metal packaging cans according to claim 1 is characterized by: The bottle holding rotating part includes a station turntable and an import station, an inspection station, and an export station arranged along the circumferential direction of the station turntable. The station turntable is rotatably arranged on the fixed bracket. The station turntable has a first surface and a second surface that are separated from each other. A plurality of station core shafts are equidistantly arranged on the first surface and arranged axially along the station turntable. A self-rotation driving device is provided at the inspection station, and the driving shaft of the self-rotation driving device is connected with the station core shaft moved to the inspection station through a clutch, so as to drive the station core shaft moved to the inspection station to rotate around its axis to cooperate with the multi-channel conduction detection unit to carry out conduction detection on the circumferential surface of the metal bottle.

3. The automatic screening system for defective surface coating of metal packaging cans according to claim 1 is characterized by: The position adjustment part includes a positioning bracket and an axial sliding bracket. The positioning bracket is provided with a slide groove arranged along the axial direction of the workstation turntable; one end of the axial sliding bracket is slidably inserted in the slide groove, and the other end is provided with two detection arms arranged along the axis of the workstation turntable and parallel to each other, and a detection channel for the metal bottle to pass through is formed between the two detection arms; every two of the contact-type conduction sensing needles form a group and are symmetrically arranged at the detection channel; the contact-type conduction sensing needle has an elastic metal detection head, and the elastic metal detection head contacts the metal bottle moved to the detection station, and the contact-type conduction sensing needle is electrically connected to the controller.

4. The automatic screening system for defective surface coating of metal packaging cans according to claim 3 is characterized by: The number of groups of the contact-type conduction sensing needles is 2 to 10, and the needles are arranged on both sides of the detection channel.

5. The automatic screening system for defective surface coating of metal packaging cans according to claim 2 is characterized by: The bottle holding and conveying device is provided with an input station and a rejection station in sequence along the conveying direction of the metal bottle; the input station is located below the output station, and the rejection station is located at the defective rejection device.

6. The automatic screening system for defective surface coating of metal packaging cans according to claim 5 is characterized by: The bottle holding and conveying device is a chain conveyor, a roller conveyor or a ratchet roller conveyor.

7. The automatic screening system for defective surface coating of metal packaging cans according to claim 6 is characterized by: The bottle holding and conveying device is a chain conveyor, which includes a frame, an endless belt, a driving motor, a driving wheel and a driven wheel. The driving wheel and the driven wheel are rotatably mounted at both ends of the frame, and the driving wheel is connected to the shaft end of the driving motor; the endless belt is wrapped around the outside of the driving wheel and the driven wheel and tensioned, and the outer surface of the endless belt is evenly spaced with Y-shaped chain plates.

8. The automatic screening system for defective surface coating of metal packaging cans according to claim 1 is characterized by: The defective product rejection device includes a bracket, a pneumatic rejection actuator, a solenoid valve and a compressed air generator, wherein the bracket is mounted on the bottle holding and conveying device; the pneumatic rejection actuator is mounted on the bracket, and the solenoid valve of the pneumatic rejection actuator has an air flow nozzle, which is aimed at the rejection station of the bottle holding and conveying device and is used to reject defective metal packaging cans with defective surface coatings transported on the bottle holding and conveying device; the control end of the solenoid valve is electrically connected to the controller, the air outlet of the solenoid valve is connected to the air inlet of the pneumatic rejection actuator, the air inlet of the solenoid valve is connected to the compressed air generator through an air pipe, and the solenoid valve is connected to the controller.

9. The automatic screening system for defective surface coating of metal packaging cans according to claim 1 is characterized by: The defective product rejection device is also provided with an alarm, and the alarm is electrically connected to the controller.

Images