Device for detecting sealing performance of easy-to-tear cover of metal can

Abstract

The invention discloses a metal can easy-to-tear cover sealing detection device, and belongs to the technical field of food packaging. Comprising a frame, an air cylinder propelling supporting column, a plurality of air cylinders, a plurality of upper molds and a plurality of lower molds. The plurality of cylinders are arranged side by side, the working ends of the cylinders are connected with the upper dies through the cylinder propulsion pillars, the plurality of lower dies are mounted on the frame, the lower dies and the upper dies are arranged in a one-to-one correspondence manner and are used for clamping the easy-to-tear covers, and the lower dies are connected with the detection gas circuit and provide detection gas for the easy-to-tear covers. According to the invention, gas is adopted as a pressure medium and is matched with the flexible air bag for non-rigid contact, so that mechanical scratch or indentation on the surface of the easy-to-tear cover (especially a pre-printed pattern or a weak area) in the detection process is avoided, and the appearance integrity and commodity of the package are protected while efficient detection is realized.

Description

Technical Field

[0001] This invention belongs to the field of food packaging technology, specifically relating to a device for detecting the sealing performance of easy-tear caps on metal cans. Background Technology

[0002] The easy-tear lids of milk powder cans may have mechanical errors and glue leakage during the manufacturing process. These manufacturing defects directly result in microscopic unevenness or gaps at the sealing interface between the lid and the can, leading to a decrease in overall sealing performance. Poorly sealed packaging can easily allow humid air to enter, causing the contents to become damp, clump, and deteriorate, seriously affecting product quality and shelf life. Summary of the Invention

[0003] In order to solve the above problems, the present invention provides a metal can easy-tear cap sealing test device to improve the quality of finished metal can packaging products.

[0004] The technical solution adopted in this invention is: A metal can easy-tear cap sealing test device includes a frame, a cylinder propulsion support, multiple cylinders, multiple upper molds, and multiple lower molds. The multiple cylinders are arranged side by side, and the working ends of the cylinders are connected to the upper molds through the cylinder propulsion support. The multiple lower molds are installed on the frame, and the lower molds and upper molds are arranged in a one-to-one correspondence and used to clamp the easy-tear cap. The lower molds are connected to the detection gas circuit to provide detection gas for the easy-tear cap.

[0005] Furthermore, the frame includes a lower base plate, an upper support plate, a front panel, a rear panel, side baffles, and multiple support columns; the upper support plate is fixed to the lower base plate by the multiple support columns, the front panel is fixed to the upper front side of the upper support plate, and the rear panel and two side baffles are respectively fixed to the rear side and the left and right sides of the lower base plate. The lower base plate, front panel, rear panel, and side baffles together form a rectangular frame with an open upper end and a lower front end.

[0006] Furthermore, the lower base plate is provided with multiple lower mold placement positions, and multiple pairs of threaded holes are opened around each lower mold placement position for fixing the set screw support block. The lower mold is fixed by a ring of set screw support blocks and set screws installed on them.

[0007] Furthermore, the front panel is equipped with a clamp working pressure gauge, a clamp switch, and a main air circuit switch connected to the cylinder air circuit, and the side baffle is equipped with an air supply switch and multiple detection working pressure gauges connected to the detection air circuit.

[0008] Furthermore, the lower mold body is cylindrical, the upper surface of the lower mold is provided with an annular groove, and a circular protrusion is provided in the middle of the annular groove. Several evenly distributed notches are provided on the outer wall of the annular groove. An air passage is opened inside the lower mold. The air passage has multiple air inlets, which are evenly distributed in an annular shape on the outer wall of the lower mold. The air outlet of the air passage is provided on the upper surface of the circular protrusion.

[0009] Furthermore, an arc-shaped groove is formed on the inner wall of the annular groove, and multiple air holes are formed at the bottom of the arc-shaped groove to communicate with the air passage below it. Multiple airbags are bonded inside the arc-shaped groove, and the multiple airbags are connected to the air passage through the air holes. After being inflated and unfolded, they can flexibly hold the easy-tear cap.

[0010] Furthermore, the upper mold body is ring-shaped, and a connecting plate is integrally connected to the upper surface of the ring, which is connected to the cylinder propulsion support through the connecting plate.

[0011] Furthermore, a slot is formed on the lower surface of the connecting plate, and a piezoelectric ceramic vibrating plate is installed in the slot.

[0012] Compared with the prior art, the present invention has the following advantages: This invention uses gas as a pressure medium, combined with a flexible airbag for non-rigid contact, avoiding mechanical scratches or indentations on the surface of the easy-tear cap (especially pre-printed patterns or weak areas) during the testing process. While achieving efficient testing, it also protects the appearance integrity and commercial value of the packaging.

[0013] This invention utilizes a flexible airbag that deforms significantly under air pressure, its expansion perfectly conforming to the irregular contours of the easy-tear cap's rolled edge and surface. This characteristic effectively compensates for poor contact caused by machining errors, irregular rolled edge shapes, or local depressions, ensuring that the detection pressure is evenly distributed across the entire tested sealing area. This eliminates the "pressure blind zone" present in traditional rigid detection heads, achieving full-range, high-fit detection of complex sealing interfaces. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the mold structure of the present invention; Figure 3 This is a main sectional view of the mold of the present invention; Figure 4 This is a schematic diagram of the structure of the mold with an arc-shaped groove in the present invention; Figure 5 This is a schematic diagram of the airbag structure of the present invention; Figure 6 This is a schematic diagram of the airbag structure of the present invention; Figure 7This is a schematic diagram of the mold structure of the present invention; Figure 8 This is a main sectional view of the mold of this invention; Figure 9 This is a schematic diagram of the mold with a slot in this invention; Figure 10 This is a schematic diagram of the lower base plate structure of the present invention; Figure 11 This is a schematic diagram of the top screw support block structure of the present invention; Figure 12 This is a physical image of the invention; Figure 13 This is a picture of the product when the easy-tear cap is placed into the lower mold; Figure 14 This is a picture of the product when the upper mold is pressing the easy-tear cap; The components are as follows: 1. Lower base plate; 101. Lower mold placement position; 2. Upper support plate; 3. Support column; 4. Lower mold; 401. Annular groove; 402. Circular protrusion; 403. Air passage; 404. Air inlet; 405. Air outlet; 406. Arc-shaped groove; 407. Airbag; 5. Upper mold; 501. Connecting plate; 502. Slot; 6. Front panel; 7. Side baffle; 8. Ejector screw support block; 9. Cylinder propulsion support column; 10. Cylinder. Detailed Implementation

[0015] To better understand the purpose, structure, and function of this invention, the invention will be described in further detail below with reference to the accompanying drawings.

[0016] like Figure 1 As shown, the present invention provides a metal can easy-tear cap sealing performance testing device, including a frame, a cylinder propulsion support 9, multiple cylinders 10, multiple upper molds 5, and multiple lower molds 4; the multiple cylinders 10 are arranged side by side, and the working ends of the cylinders 10 are connected to the upper molds 5 through the cylinder propulsion support 9; the multiple lower molds 4 are mounted on the frame, and the lower molds 4 and the upper molds 5 are arranged in a one-to-one correspondence and used to clamp the easy-tear cap; the lower molds 4 are connected to the detection gas circuit to provide detection gas for the easy-tear cap.

[0017] like Figure 1 As shown, the frame includes a lower base plate 1, an upper support plate 2, a front panel 6, a rear panel, side baffles 7, and multiple support columns 3. The upper support plate 2 is fixed to the lower base plate 1 by multiple support columns 3. The front panel 6 is fixed to the upper front side of the upper support plate 2. The rear panel and two side baffles 7 are fixed to the rear side and the left and right sides of the lower base plate 1, respectively. The lower base plate 1, the front panel 6, the rear panel, and the side baffles 7 together form a rectangular frame with an open upper end and a lower front end.

[0018] like Figure 1 , Figure 10 , Figure 11As shown, the lower base plate 1 is provided with multiple lower mold placement positions 101, and multiple pairs of threaded holes are opened around each lower mold placement position 101 for fixing the top screw support block 8. The lower mold 4 is fixed by a ring of top screw support blocks 8 and the top screws installed on them.

[0019] The lower mold 4, from right to left, corresponds to the 502#, 401#, 307#, and 300# easy-tear cap fixing molds respectively.

[0020] The upper mold 5, from right to left, corresponds to the 502#, 401#, 307#, and 300# easy-tear cap fixing molds respectively.

[0021] like Figure 1 As shown, the front panel 6 is equipped with a clamp working pressure gauge, a clamp switch, and a main air circuit switch connected to the air circuit of the cylinder 10. The side baffle 7 is equipped with a detection switch and multiple detection working pressure gauges connected to the detection air circuit.

[0022] like Figure 2 , Figure 3 As shown, the lower mold 4 is cylindrical in shape. An annular groove 401 is provided on the upper surface of the lower mold 4, and a circular protrusion 402 is provided in the middle of the annular groove 401. Several evenly distributed notches are provided on the outer wall of the annular groove 401 to facilitate the removal of the easy-tear cap. An air passage 403 is opened inside the lower mold 4. Multiple air inlets 404 of the air passage 403 are provided and are evenly distributed in an annular shape on the outer wall of the lower mold 4. The air outlet 405 of the air passage 403 is provided on the upper surface of the circular protrusion 402.

[0023] like Figure 4 , Figure 5 , Figure 6 As shown, an arc-shaped groove 406 is opened on the inner wall surface of the annular groove 401. Multiple air holes are opened at the bottom of the arc-shaped groove 406 and are connected to the air channel 403 below it. Multiple airbags 407 are bonded inside the arc-shaped groove 406. The multiple airbags 407 are connected to the air channel 403 through the air holes. After being inflated and unfolded, they can flexibly clamp the easy-tear cap.

[0024] When not in use, multiple airbags 407 are placed in the arc-shaped groove 406. The inner end of the airbag 407 is bonded to the inner wall of the annular groove 401, and a small hole is opened below the inner end of the airbag 407 to communicate with the corresponding air hole.

[0025] The pressure is slowly introduced into the airbag 407 through the arc-shaped slot 406, causing the airbag 407 to gradually expand outward and enhance the contact stress with the easy-tear cap of the metal can. In particular, it can compensate for the local pressure deficiency caused by the irregular curling edge of the easy-tear cap.

[0026] like Figure 7 , Figure 8As shown, the upper mold 5 is ring-shaped, and a connecting plate 501 is integrally connected to the upper surface of the ring. The connecting plate 501 is connected to the cylinder propulsion support column 9.

[0027] like Figure 9 As shown, a slot 502 is formed on the lower surface of the connecting plate 501, and a piezoelectric ceramic vibrating plate is installed in the slot 502.

[0028] Piezoelectric ceramic vibrating pads can monitor whether the easy-tear cap vibrates abnormally. If there is abnormal vibration, it means that the easy-tear cap has a problem with glue leakage and the product is unqualified.

[0029] Bottom plate 1: A 1200mm×400mm×15mm galvanized steel plate, referencing the diameters of three cans (502# / 401# / 307# / 300#), formed by stamping, drilling, and grinding to create four lower mold placement positions 101 with outer diameter 270mm and inner diameter 240mm, outer diameter 270mm and inner diameter 210mm, outer diameter 270mm and inner diameter 210mm, and outer diameter 270mm and inner diameter 210mm. Through-hole drilling is used to create screw holes for fixing the lower mold 4, the ejector screw support block 8, and the support column 3; Upper support plate 2: A 1200mm×400mm×15mm galvanized steel plate, with through holes drilled to form screw holes for fixing four cylinders 10 and support column 3; Support column 3: 10 stainless steel columns, each 400mm long and 25mm in diameter, with holes drilled at the top and bottom and fastening screws, connecting the lower base plate 1 and the upper support plate 2; Lower mold 4: It is connected to the lower base plate 1 by passing the set screw through the set screw support block 8, which facilitates the adjustment of the fine distance. From right to left, it corresponds to the mold fixing of easy-tear caps 502#, 401#, 307#, and 300# respectively. Upper mold 5: The support column 9 is connected to the cylinder 10 via a cylinder. From right to left, they correspond to the molds for fixing easy-tear caps: 502#, 401#, 307#, and 300#. Front panel 6: Connected to the upper side baffle 7, with several pressure gauges, control levers and switches installed at the reserved hole positions; Side baffle 7: Two stainless steel plates, each 1200mm×400mm×400mm thick and 1.2mm thick, are laser-cut and cut into the inner side at the intersection of the bends. Together with the lower base plate 1, the upper support plate 2, and the front panel 6, they form an overall main frame structure. Ejector screw support block 8: The lower mold 4 is supported by ejector screws, and the position of the lower mold 4 can be finely adjusted by rotating the ejector screws; Cylinder-driven support column 9: It is connected and fixed to the upper mold 5 through the cylinder connecting plate.

[0030] Work process: (1) Place the sample cap into the corresponding model of the lower mold 4; (2) Pull the pressure setting knob to the left, and rotate the knob to set the clamp working pressure ≥0.4Mpa and the detection pressure ≥0.14Mpa respectively; (3) Turn the clamp switch to the left, and the cylinder 10 pushes the upper mold 5 to press the sample; turn the detection switch to the left (can be normally open); (4) Turn the air supply switch to supply air to the lower mold 4. (5) Start holding pressure and observe the pressure gauge reading for more than 30 seconds without any change. If the pressure reading drops, the sample is qualified. (6) After the test is completed, turn the clamp switch to the right to make the cylinder 10 drive the upper mold 5 to rise, and take out the sample and place it in the scrap area.

[0031] It is understood that the present invention has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the invention. Furthermore, under the teachings of the present invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of the present invention.

Claims

1. A device for detecting the sealing performance of an easy-tear cap on a metal can, characterized in that: It includes a frame, a cylinder propulsion support (9), multiple cylinders (10), multiple upper molds (5), and multiple lower molds (4); the multiple cylinders (10) are arranged side by side, and the working end of the cylinder (10) is connected to the upper mold (5) through the cylinder propulsion support (9). The multiple lower molds (4) are installed on the frame. The lower molds (4) and the upper molds (5) are arranged one-to-one and used to clamp the easy-tear cap. The lower molds (4) are connected to the detection air circuit to provide detection gas for the easy-tear cap.

2. The metal can easy-tear cap sealing performance testing device according to claim 1, characterized in that: The frame includes a lower base plate (1), an upper support plate (2), a front panel (6), a rear panel, side baffles (7), and multiple support columns (3); the upper support plate (2) is fixed to the lower base plate (1) by multiple support columns (3), the front panel (6) is fixed to the upper front side of the upper support plate (2), and the rear panel and two side baffles (7) are fixed to the rear side and the left and right sides of the lower base plate (1) respectively. The lower base plate (1), the front panel (6), the rear panel, and the side baffles (7) together form a rectangular frame with an open upper end and a lower front end.

3. The metal can easy-tear cap sealing performance testing device according to claim 2, characterized in that: The lower base plate (1) is provided with multiple lower mold placement positions (101), and multiple pairs of threaded holes are opened around each lower mold placement position (101) for fixing the top screw support block (8). The lower mold (4) is fixed by a ring of top screw support blocks (8) and the top screws installed on them.

4. The device for detecting the sealing performance of an easy-tear metal can lid according to claim 2, characterized in that: The front panel (6) is provided with a clamp working pressure gauge, a clamp switch and a main air circuit switch connected to the air circuit of the cylinder (10), and the side baffle (7) is provided with an air supply switch and multiple detection working pressure gauges connected to the detection air circuit.

5. The metal can easy-tear cap sealing performance testing device according to claim 1, characterized in that: The lower mold (4) is cylindrical in shape. An annular groove (401) is provided on the upper surface of the lower mold (4), and a circular protrusion (402) is provided in the middle of the annular groove (401). Several evenly distributed notches are provided on the outer wall of the annular groove (401). An air passage (403) is opened inside the lower mold (4). Multiple air inlets (404) of the air passage (403) are provided and are evenly distributed on the outer wall of the lower mold (4). The air outlet (405) of the air passage (403) is provided on the upper surface of the circular protrusion (402).

6. The metal can easy-tear cap sealing performance testing device according to claim 5, characterized in that: An arc-shaped groove (406) is opened on the inner wall surface of the annular groove (401). Multiple air holes are opened at the bottom of the arc-shaped groove (406) and are connected to the air passage (403) below it. Multiple airbags (407) are bonded inside the arc-shaped groove (406). The multiple airbags (407) are connected to the air passage (403) through the air holes. After being inflated and unfolded, they can flexibly hold the easy-tear cap.

7. The metal can easy-tear cap sealing performance testing device according to claim 1, characterized in that: The upper mold (5) is ring-shaped, and a connecting plate (501) is integrally connected to the upper surface of the ring. The connecting plate (501) is connected to the cylinder propulsion support (9).

8. The metal can easy-tear cap sealing performance testing device according to claim 7, characterized in that: A slot (502) is provided on the lower surface of the connecting plate (501), and a piezoelectric ceramic vibrating plate is installed in the slot (502).

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