Aluminum pipe inner coating detection equipment

Abstract

The utility model discloses aluminum pipe inner coating detection equipment which comprises an aluminum pipe mounting table used for fixing an inverted aluminum pipe, the aluminum pipe mounting table is provided with a lower electrode and an upper electrode, the lower electrode is used for being in conductive contact with a pipe nozzle of the aluminum pipe, and the upper electrode is movably matched with the aluminum pipe mounting table in a lifting mode and used for stretching into an inner cavity of the aluminum pipe from the tail of the aluminum pipe; and the current detection device supplies power to the lower electrode and the upper electrode, detects current flowing between the lower electrode and the upper electrode, and feeds back the current. The conductive liquid is filled into the inner cavity of the aluminum pipe, and meanwhile, by means of the structural characteristics that the nozzle of the aluminum pipe faces downwards and is exposed (not painted), the nozzle is connected to the lower electrode, the upper electrode is inserted into the conductive liquid from the tail of the aluminum pipe, namely, resistance is formed between the pipe body and the conductive liquid, and the larger the resistance is, the lower the current value is, otherwise, the higher the current value is. Therefore, the coverage of the inner coating of the inner cavity of the aluminum tube is judged.

Description

Technical Field

[0001] The utility model relates to a quality inspection device for aluminum hoses used for packaging, in particular to an internal coating inspection device for aluminum hoses. Background Art

[0002] The production process of aluminum hoses (aluminum tubes) generally includes the following steps: forming, heat treatment, internal spraying, baking, external spraying (or painting), baking, and covering; among them, the quality of the inner coating is related to the quality of the aluminum tube. Once the inner coating is worn, the contents of the aluminum tube will come into contact with the aluminum material, which is easy to corrode the aluminum tube.

[0003] During the aluminum tube production process, the quality of the inner coating is generally affected by two steps. First, the inner spraying process, where the spraying process affects the uniformity of the coating. Second, during the outer spraying process, the aluminum tube is placed around a rotating shaft and rotated by the shaft. Dirt, scratches, or idling with the tube can cause varying degrees of wear on the inner coating. Existing methods for inspecting the inner coating rely primarily on observation. Because the inner paint is dark yellow (light brown), the uncoated aluminum tube is silver-gray. Thick and thin coatings are distinguished by a darker color and a lighter color. This approach involves randomly breaking open the tube and observing the inner coating color to determine if the coating has been evenly applied. Any transition between light and dark indicates uneven application. However, this inspection method is prone to misjudgment. Furthermore, if the coating quality deteriorates due to the second factor, observation can easily miss areas of wear. Utility Model Content

[0004] The purpose of the utility model is to provide an aluminum tube inner coating detection device which has a simple and reasonable structure and is easy to use.

[0005] The purpose of this utility model is achieved in this way:

[0006] Disclosed is an aluminum tube inner coating detection device, comprising an aluminum tube mounting platform for fixing an inverted aluminum tube, the aluminum tube mounting platform being provided with a lower electrode and an upper electrode, the lower electrode being used for conductive contact with the nozzle of the aluminum tube, the upper electrode being coordinated with the aluminum tube mounting platform for lifting and lowering, and being used for extending from the tail end of the aluminum tube into the inner cavity of the aluminum tube; a current detection device for supplying power to the lower and upper electrodes, detecting the current flowing between the lower and upper electrodes, and providing feedback.

[0007] The purpose of the utility model can also be solved by the following technical measures:

[0008] As a more specific solution, the aluminum tube mounting platform includes a base, a socket, a vertical pole and a plug. The socket and the vertical pole are fixed on the base. The top surface of the socket is provided with a groove corresponding to the tube head of the aluminum tube, and the lower electrode is arranged at the bottom of the groove; a cross bar is provided on the vertical pole, and the plug is located below the cross bar and directly opposite the socket. The upper end of the plug is movably coordinated with the cross bar through a lifting rod, and the upper electrode is arranged at the bottom of the plug.

[0009] As a further solution, the upper electrode is a silver electrode, because silver has good stability and avoids electrolysis when in contact with the conductive liquid.

[0010] As a further solution, a cavity is provided at the bottom of the groove corresponding to the nozzle of the aluminum tube, the lower electrode is arranged in the cavity, and a spring is provided between the bottom of the lower electrode and the cavity.

[0011] As a further solution, the aluminum tube includes a tube body and a tube head, one end of the tube body is open to form the tail of the aluminum tube, and the tube head includes a tube shoulder and a tube nozzle, the tube nozzle is closed and connected to the other end of the tube body through the tube shoulder; the inner wall of the aluminum tube is provided with an inner coating, or the inner wall of the aluminum tube and the outer wall of the tube body are provided with an inner coating and an outer coating respectively, and the aluminum surface of the tube nozzle is exposed; during testing, a conductive liquid is filled inside the aluminum tube, the upper electrode is in contact with the conductive liquid, and the tube nozzle is in contact with the lower electrode.

[0012] As a further solution, the current detection device includes a DC power supply circuit and a current detection circuit. The DC power supply circuit supplies power to the lower electrode and the upper electrode. The current detection circuit is connected in series with the upper electrode or the lower electrode. The current detection circuit can feedback the current value.

[0013] As a further solution, the DC power supply circuit includes a step-down coil, a rectifier bridge stack and a filter capacitor.

[0014] As a further solution, one end of the cross bar is provided with a sleeve hole, and is connected to the vertical pole through the sleeve hole. A locking screw is provided on one side of the cross bar, and the locking screw extends into the sleeve hole from the outside of the cross bar and abuts against the vertical pole; the cross bar is provided with a through hole running through its upper and lower sides, and the inner wall of the through hole is provided with a pre-tightening rib. The lifting rod is plugged into the through hole and frictionally fits with the pre-tightening rib. A wire threading hole is provided in the center of the lifting rod, and a handle is provided at the upper end of the lifting rod. The lower end of the lifting rod is electrically connected to the upper electrode after passing through the plug.

[0015] The beneficial effects of the utility model are as follows:

[0016] The utility model fixes the inverted aluminum tube by an aluminum tube mounting platform, making it convenient to fill the inner cavity of the aluminum tube with conductive liquid. At the same time, by virtue of the structural characteristics of the aluminum tube with the nozzle facing downward and exposed (not painted), the nozzle is supported on the lower electrode, and the upper electrode moves up and down, making it convenient for the upper electrode to be inserted into the conductive liquid from the tail of the aluminum tube, that is, a resistance is formed between the tube body and the conductive liquid. The better the inner coating of the inner cavity of the aluminum tube protects the material of the inner surface of the tube body, the better the quality. At the same time, the greater the resistance, the smaller the current value measured by the current detection device. Conversely, when the inner coating is thin or damaged, the current value measured by the current detection device increases, thereby detecting the quality of the inner coating. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a structural diagram of an embodiment of the present utility model.

[0018] Figure 2 for Figure 1 Enlarged structural diagram at point B in the middle.

[0019] Figure 3 This is a schematic diagram of the connection structure between the cross bar, the vertical bar and the lifting rod in the utility model.

[0020] Figure 4 for Figure 3 Enlarged structural diagram at point C in the middle.

[0021] Figure 5 This is a schematic diagram of the circuit principle of the utility model. DETAILED DESCRIPTION

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0023] See also Figures 1 to 5 As shown, an aluminum tube inner coating detection device includes an aluminum tube mounting platform 2 for fixing an inverted aluminum tube 1. The aluminum tube mounting platform 2 is provided with a lower electrode 32 and an upper electrode 41. The lower electrode 32 is used to make conductive contact with the nozzle 12 of the aluminum tube 1. The upper electrode 41 is coordinated with the aluminum tube mounting platform 2 for lifting and lowering and is used to extend from the rear end of the aluminum tube 1 into the inner cavity 11 of the aluminum tube 1; a current detection device 5 is used to supply power to the lower electrode 32 and the upper electrode 41, detect the current flowing between the lower electrode 32 and the upper electrode 41, and provide feedback.

[0024] The aluminum tube mounting platform 2 includes a base 21, a socket 3, a vertical rod 22, and a plug 25. The socket 3 and vertical rod 22 are fixed to the base 21. The top surface of the socket 3 is provided with a groove corresponding to the tube head of the aluminum tube 1, and the lower electrode 32 is disposed at the bottom of the groove. A crossbar 23 is provided on the vertical rod 22, and the plug 25 is located below the crossbar 23 and directly opposite the socket 3. The upper end of the plug 25 is movably engaged with the crossbar 23 via a lifting rod 4. The upper electrode 41 is disposed at the bottom of the plug 25. The socket 3 is made of rubber material and can be tightly fitted with the tube head of the aluminum tube 1.

[0025] One end of the cross bar 23 is provided with a sleeve hole, and is sleeved with the vertical rod 22 through the sleeve hole. A locking screw 24 is provided on one side of the cross bar 23. The locking screw 24 extends into the sleeve hole from the outside of the cross bar 23 and abuts against the vertical rod 22; the cross bar 23 is provided with a through hole 26 running through the upper and lower sides thereof, and the inner wall of the through hole 26 is provided with a pre-tightening rib 261. The lifting rod 4 is plugged into the through hole 26 and frictionally engaged with the pre-tightening rib 261. A threading hole 43 is provided in the center of the lifting rod 4, and a handle 42 is provided at the upper end of the lifting rod 4. The lower end of the lifting rod 4 passes through the plug 25 and is electrically connected to the upper electrode 41.

[0026] The upper electrode 41 is a silver electrode.

[0027] The bottom of the groove is also provided with a cavity 31 corresponding to the nozzle 12 of the aluminum tube 1 . The lower electrode 32 is arranged in the cavity 31 . A spring 33 is provided between the bottom of the lower electrode 32 and the cavity 31 .

[0028] The aluminum tube 1 comprises a tube body and a tube head. One end of the tube body is open, forming the tail of the tube 1. The tube head comprises a tube shoulder and a nozzle 12. The nozzle 12 is sealed and connected to the other end of the tube body via the tube shoulder. The inner wall of the aluminum tube 1 is provided with an inner coating 13, and the aluminum surface of the nozzle 12 is exposed. During testing, the aluminum tube 1 is filled with conductive liquid A, the upper electrode 41 contacts the conductive liquid A, and the nozzle 12 contacts the lower electrode 32. The conductive liquid A is prepared by blending 50g of copper sulfate, 0.25g of silica aerosol, 2.5g of glacial acetic acid, and 5kg of distilled water.

[0029] The current detection device 5 includes a DC power supply circuit 51 and a current detection circuit 53. The DC power supply circuit 51 supplies power to the lower electrode 32 and the upper electrode 41. The current detection circuit 53 is connected in series with the upper electrode 41 or the lower electrode 32. The current detection circuit 53 can feedback the current value.

[0030] The DC power supply circuit 51 includes a step-down coil 54 , a rectifier bridge 55 and a filter capacitor 56 .

[0031] The current detection device 5 further includes a voltage detection circuit 52, which is electrically connected between the upper electrode 41 and the lower electrode 32. The current detection circuit 53 and the voltage detection circuit 52 are provided with a current digital display screen 531 and a voltage digital display screen 521, respectively.

[0032] The current detection device 5 is a conventional technology, which provides a 5V DC power supply through a DC power supply circuit 51. The positive (+) pole of the DC power supply is electrically connected to the upper electrode 41 through a current detection circuit 53, and the negative (-) pole of the DC power supply is electrically connected to the lower electrode 32. The voltage detection circuit 52 is electrically connected between the upper electrode 41 and the lower electrode 32.

[0033] The detection principle is as follows: an aluminum tube 1 having an inner coating 13 on the inner wall of an inner cavity 11 is inserted upside down into a groove 34 of a socket 3, with the nozzle 12 in conductive contact with the lower electrode 32; a conductive liquid A is introduced into the inner cavity 11, and the plug 25 is pulled down to the tail end of the aluminum tube 1, with the upper electrode 41 inserted into the conductive liquid A. The current detection device 5 is activated to allow electricity to flow between the conductive liquid A and the outer surface of the aluminum tube 1, and the actual current value of the energized circuit is measured, which is fed back to the current digital display 531.

[0034] Combined with the conductive properties of the aluminum tube and the resistance of the inner coating (calculated based on the inner coating thickness of qualified products), a current range value (A0) is set as a reference standard after a standard part is energized in the above manner. When the actual current value is higher than A0, it is judged that the inner coating 13 does not meet the standard (indicating that the thickness of the inner coating is uneven or worn); when the actual current value is lower than A0, it is judged that the inner coating 13 is too thick, or the electrode has poor contact.

[0035] The current detection device 5 may have an alarm function, and a reference current value A0 is pre-set. When the actual current value is higher or lower than A0, an alarm is given through an indicator light and / or a buzzer. This type of circuit also belongs to the prior art. The present technical solution is to combine this method with the aluminum tube mounting platform 2 for inner coating quality detection.

[0036] The above is a preferred embodiment of the present invention, which illustrates and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the present invention, which is defined by the appended claims and their equivalents.

Claims

1. An aluminum tube inner coating detection device, characterized by: The aluminum tube mounting platform (2) is used to fix the inverted aluminum tube (1). The aluminum tube mounting platform (2) is provided with a lower electrode (32) and an upper electrode (41). The lower electrode (32) is used to be in conductive contact with the nozzle (12) of the aluminum tube (1). The upper electrode (41) is coordinated with the aluminum tube mounting platform (2) in a lifting motion and is used to extend from the tail of the aluminum tube (1) into the inner cavity (11) of the aluminum tube (1). The current detection device (5) supplies power to the lower electrode (32) and the upper electrode (41), detects the current flowing between the lower electrode (32) and the upper electrode (41), and provides feedback.

2. The aluminum tube inner coating detection equipment according to claim 1, characterized in that: The aluminum tube mounting platform (2) comprises a base (21), a socket (3), a vertical rod (22) and a plug (25); the socket (3) and the vertical rod (22) are fixed on the base (21); a groove is provided on the top surface of the socket (3) corresponding to the tube head of the aluminum tube (1); the lower electrode (32) is arranged at the bottom of the groove; a cross bar (23) is provided on the vertical rod (22); the plug (25) is located below the cross bar (23) and directly opposite to the socket (3); the upper end of the plug (25) is movably matched with the cross bar (23) via a lifting rod (4); and the upper electrode (41) is arranged at the bottom of the plug (25).

3. The aluminum tube inner coating detection equipment according to claim 1, characterized in that: The upper electrode (41) is a silver electrode.

4. The aluminum tube inner coating detection device according to claim 2, characterized in that: The bottom of the groove is also provided with a cavity (31) corresponding to the nozzle (12) of the aluminum tube (1), the lower electrode (32) is arranged in the cavity (31), and a spring (33) is provided between the bottom of the lower electrode (32) and the cavity (31).

5. The aluminum tube inner coating detection equipment according to claim 1, characterized in that: The aluminum tube (1) comprises a tube body and a tube head, one end of the tube body is open to form the tail of the aluminum tube (1), the tube head comprises a tube shoulder and a tube nozzle (12), the tube nozzle (12) is closed and connected to the other end of the tube body through the tube shoulder; the inner wall of the aluminum tube (1) is provided with an inner coating (13), or the inner wall of the aluminum tube (1) and the outer wall of the tube body are provided with an inner coating (13) and an outer coating respectively, and the aluminum surface of the tube nozzle (12) is exposed; during detection, the aluminum tube (1) is filled with a conductive liquid (A), the upper electrode (41) is in contact with the conductive liquid (A), and the tube nozzle (12) is in contact with the lower electrode (32).

6. The aluminum tube inner coating detection equipment according to claim 1, characterized in that: The current detection device (5) comprises a DC power supply circuit (51) and a current detection circuit (53). The DC power supply circuit (51) supplies power to the lower electrode (32) and the upper electrode (41). The current detection circuit (53) is connected in series with the upper electrode (41) or the lower electrode (32). The current detection circuit (53) can feed back a current value.

7. The aluminum tube inner coating detection device according to claim 6, characterized in that: The DC power supply circuit (51) comprises a step-down coil, a rectifier bridge stack and a filter capacitor.

8. The aluminum tube inner coating detection device according to claim 6, characterized in that: The current detection device (5) further comprises a voltage detection circuit (52), wherein the voltage detection circuit (52) is electrically connected between the upper electrode (41) and the lower electrode (32).

9. The aluminum tube inner coating detection device according to claim 2, characterized in that: One end of the cross bar (23) is provided with a sleeve hole, and is sleeved with the vertical bar (22) through the sleeve hole. A locking screw (24) is provided on one side of the cross bar (23). The locking screw (24) extends from the outside of the cross bar (23) into the sleeve hole and abuts against the vertical bar (22). The cross bar (23) is provided with a through hole (26) passing through the upper and lower sides thereof. The inner wall of the through hole (26) is provided with a pre-tightening rib (261). The lifting rod (4) is plugged into the through hole (26) and frictionally matched with the pre-tightening rib (261). A threading hole (43) is provided at the center of the lifting rod (4). A handle (42) is provided at the upper end of the lifting rod (4). The lower end of the lifting rod (4) passes through the plug (25) and is electrically connected to the upper electrode (41).

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