Sealing airtightness detection equipment, production line and detection method for sealing of film sealing product

Abstract

The invention discloses film sealing product seal airtightness detection equipment, a production line and a detection method, belongs to the technical field of airtightness detection, and in order to detect the seal airtightness of a film sealing product, the film sealing product seal airtightness detection equipment comprises a sealing mechanism (1), a conveying mold (2), an air pressure supply device (3) and a pressure detection device (4), a product containing cavity (21) is formed in the conveying mold (2), the closing mechanism (1) can make the product containing cavity (21) become a sealed cavity, the air pressure supply device (3) can supply air into the product containing cavity (21), and the pressure detection device (4) can detect the air pressure in the product containing cavity (21). The whole detection process is carried out in a closed space, a pressure environment needs to be quickly and accurately established in the closed space, the detection efficiency is not influenced, and each product can be compared by using the same standard value, so that all the products can be subjected to air tightness detection in a short time according to a unified standard.

Description

Technical Field

[0001] The present invention relates to the technical field of airtightness detection, and in particular to an airtightness detection device for sealing a film product, a film-sealing product production line, and a method for detecting airtightness of a film-sealing product. Background Art

[0002] Existing capsule packaging products can be compared to coffee capsules on the market. These capsules primarily consist of a small can, a sealing film (typically aluminum film and a composite layer), and the contents to be encapsulated. Existing sealing methods for capsules and rigid cans are typically heat-sealed, ultrasonic-sealed, or screw-on. These critical sealing components are subject to wear and misalignment over time, potentially leading to the release of defective products into the market.

[0003] Currently, most manufacturers test the sealing tightness of their film products through methods such as random product inspections using a timed, quantitative, watertight, negative pressure method, and regular inspection and maintenance of sealing components. However, as the number of products increases exponentially, these methods still pose significant risks. Summary of the Invention

[0004] In order to detect the sealing tightness of sealed film products, the present invention provides a sealed film product sealing airtightness detection device, production line and detection method. The entire detection process is carried out in a closed space, and the pressure environment needs to be established quickly and accurately inside without affecting the detection efficiency. The same standard value can be used to compare each product, so that all products can be tested for airtightness in a short period of time according to a unified standard.

[0005] The technical solution adopted by the embodiment of the present invention to solve the technical problem is:

[0006] A sealed product airtightness testing device includes: a sealing mechanism, a conveying mold, an air pressure supply device and a pressure detection device. A product accommodating cavity is provided in the conveying mold, and the product accommodating cavity can accommodate the product to be tested. The sealing mechanism can make the product accommodating cavity a sealed cavity. The air pressure supply device can supply a set volume of gas into the product accommodating cavity and increase the air pressure in the product accommodating cavity. The pressure detection device can detect the air pressure in the product accommodating cavity.

[0007] A film sealing product production line comprises a transmission device and the above-mentioned film sealing product sealing airtightness detection equipment, wherein the transmission device can drive the transport mold to move in the front-rear direction.

[0008] A method for detecting airtightness of sealed film products, wherein the method employs the above-mentioned airtightness detection device for sealed film products, and the method comprises the following steps:

[0009] Step 1: The product to be tested is placed in the product holding cavity, and the sealing mechanism makes the product holding cavity a sealed cavity;

[0010] Step 2: The air pressure supply device supplies a set volume of gas into the product containing chamber and increases the air pressure in the product containing chamber, and the pressure detection device detects the air pressure in the product containing chamber; when the pressure detection device detects that the air pressure in the product containing chamber is greater than or equal to the set value, the tested product is a qualified product; when the pressure detection device detects that the air pressure in the product containing chamber is less than the set value, the tested product is an unqualified product.

[0011] The beneficial effects of the embodiments of the present invention are:

[0012] The entire testing process is carried out in a closed space, and the pressure environment needs to be established quickly and accurately without affecting the testing efficiency. The same standard value can be used to compare each product, so that all products can be tested for air tightness in a short period of time with unified standards. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The drawings in the specification, which constitute a part of this application, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0014] Figure 1 It is a schematic main view of the detection part of the sealing airtightness detection equipment for film-sealed products of the present invention.

[0015] Figure 2 It is along Figure 1 Schematic cross-sectional view in the AA direction.

[0016] Figure 3 yes Figure 2 Enlarged schematic diagram of part C in the middle.

[0017] Figure 4 It is a simplified schematic diagram of the sealing airtightness detection equipment for film-sealed products according to the present invention.

[0018] Figure 5 It is a schematic diagram of a control cabinet of the sealing airtightness detection equipment for film-sealed products according to the present invention.

[0019] Figure 6 It is along Figure 5 Schematic cross-sectional view in the BB direction.

[0020] The following are the descriptions of the reference numerals:

[0021] 1. Closing mechanism; 2. Transport mold; 3. Air pressure supply device; 4. Pressure detection device; 5. Rack; 6. Control cabinet; 7. Product under test;

[0022] 11. Upper clamping component; 12. Lower clamping component;

[0023] 21. Product accommodation cavity;

[0024] 31. Air supply air cylinder; 32. Piston drive mechanism; 33. Air supply pipeline; 34. Three-way joint;

[0025] 41. Connecting pipeline;

[0026] 111. Lower pressing cylinder; 112. Upper pressing cover; 113. Air inlet;

[0027] 121. Support cylinder; 122. Support cover;

[0028] 311. Piston; 312. Piston cavity; 313. Air outlet. Detailed implementation manners

[0029] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The following will describe the present invention in detail with reference to the drawings and in combination with the embodiments.

[0030] For the convenience of understanding and description, an absolute positional relationship is adopted in the following description of the present invention. Without special explanation, the orientation word "upper" represents Figure 1 the upper side direction in Figure 1 the orientation word "lower" represents Figure 1 the lower side direction in Figure 1 the orientation word "left" represents Figure 1 the left side direction in Figure 1 the orientation word "right" represents

[0031] such as Figures 1 to 4As shown, an embodiment of the present invention describes a sealed film product sealing airtightness detection device, which includes: a sealing mechanism 1, a conveying mold 2, an air pressure supply device 3 and a pressure detection device 4. A product accommodating cavity 21 is provided in the conveying mold 2. The product accommodating cavity 21 can accommodate the product to be tested 7 (that is, the product to be tested 7 can be placed in the product accommodating cavity 21). The sealing mechanism 1 can make the product accommodating cavity 21 a sealed cavity, and the sealed cavity is isolated from the external environment of the conveying mold 2. The air pressure supply device 3 can supply a set volume of gas to the product accommodating cavity 21, and make the air pressure in the product accommodating cavity 21 increase and reach a set value. The pressure detection device 4 can detect the air pressure in the product accommodating cavity 21.

[0032] The product-containing cavity 21 may be open at one end and closed at the other, or both ends may be open. When the product-containing cavity 21 is open at one end and closed at the other, the sealing mechanism 1 can seal one end (i.e., the open end) of the product-containing cavity 21. When the product-containing cavity 21 is open at both ends, the sealing mechanism 1 can seal both ends of the product-containing cavity 21.

[0033] In this embodiment, if Figure 1 As shown, the transport mold 2 has an elongated plate-like structure, and the product-receiving cavity 21 is a through-hole structure. The product-receiving cavity 21 extends vertically through the transport mold 2. The upper and lower ends of the product-receiving cavity 21 are both open, and all or part of the product 7 under test can be clamped and placed in the product-receiving cavity 21. The sealing mechanism 1 includes an upper clamping assembly 11 and a lower clamping assembly 12. The upper clamping assembly 11 can seal the upper end of the product-receiving cavity 21, while the lower clamping assembly 12 can seal the lower end of the product-receiving cavity 21.

[0034] like Figures 2 to 4 As shown, the upper clamping assembly 11 is located above the conveying mold 2. The upper clamping assembly 11 contains a lower pressure cylinder 111 and an upper pressure cover 112 connected up and down. The lower pressure cylinder 111 can be a hydraulic cylinder or a pneumatic cylinder. The upper pressure cover 112 is fixedly connected to the piston rod of the lower pressure cylinder 111. The lower pressure cylinder 111 can drive the upper pressure cover 112 to move up and down. The upper pressure cover 112 can be sealed and connected to the upper end of the conveying mold 2, thereby closing the upper end of the product holding cavity 21.

[0035] The lower clamping assembly 12 is located below the conveying mold 2. The lower clamping assembly 12 contains a support cylinder 121 and a support cover 122 connected at the bottom and top. The support cylinder 121 can be a hydraulic cylinder or a pneumatic cylinder. The support cover 122 is fixedly connected to the piston rod of the support cylinder 121. The support cylinder 121 can drive the support cover 122 to move up and down. The support cover 122 can be sealed and connected to the lower end of the conveying mold 2, thereby closing the lower end of the product holding cavity 21.

[0036] In this embodiment, the air pressure supply device 3 is located above the upper clamping assembly 11. The air pressure supply device 3 includes an air supply cylinder 31, a piston drive mechanism 32 and an air supply pipeline 33. The air supply cylinder 31 includes a piston rod, a piston 311 and a piston chamber 312. The piston drive mechanism 32 can drive the piston 311 to move back and forth. The air supply cylinder 31 is connected to the upper pressure cover 112 through the air supply pipeline 33, and the piston chamber 312 can be connected to the product accommodating chamber 21.

[0037] like Figure 2 and Figure 4 As shown, the piston chamber 312 includes a rod chamber and a rodless chamber, and an air outlet 313 is provided on the air supply cylinder 31, and the air outlet 313 is connected to the rodless chamber of the piston chamber 312, and an air inlet 113 is provided on the upper pressure cover 112, one end of the air supply pipeline 33 is connected to the air outlet 313, and the other end of the air supply pipeline 33 is connected to the air inlet 113, and the gas in the rodless chamber of the piston chamber 312 can enter the product holding chamber 21 through the air supply pipeline 33, and the set volume can be 10% to 50% of the total volume of the piston chamber 312. When the closing mechanism 1 makes the product holding chamber 21 a sealed cavity, the gas in the rodless chamber of the piston chamber 312 can enter the product holding chamber 21 through the air supply pipeline 33 and increase the air pressure in the product holding chamber 21. The air pressure in the rodless chamber of the piston chamber 312, the air pressure in the air supply pipeline 33 and the air pressure in the product holding chamber 21 are all the same.

[0038] In this embodiment, if Figure 2 and Figure 4 As shown, the pressure detection device 4 is connected to the air supply line 33 via the connecting line 41 and the tee 34 in sequence. The pressure detection device 4 can measure the air pressure (pressure value or pressure value) in the air supply line 33. The pressure detection device 4 can measure the air pressure value in the air supply line 33 to obtain the air pressure value in the product holding chamber 21.

[0039] like Figure 1 and Figure 4 As shown, the piston drive mechanism 32 contains a motor, a rotating assembly, a rotating shaft and a rocker connected in sequence. The rocker is connected to the piston rod of the air supply hydraulic cylinder 31. The reverse rotation of the motor of the piston drive mechanism 32 can drive the rocker to swing up and down, thereby moving the piston 311 of the air supply hydraulic cylinder 31 to the upper limit position or the lower limit position.

[0040] The air pressure supply device 3 adopts an air supply cylinder 31, and the piston drive mechanism 32 contains a motor, a rotating assembly, a rotating shaft and a rocker connected in sequence. Its advantage is that the piston 311 of the air supply cylinder 31 is fixed at the upper limit position or the lower limit position each time. The air pressure supply device 3 supplies a set volume of gas to the product holding chamber 21, so that the air pressure increase value in the product holding chamber 21 is also fixed, reducing the influence of the air pressure source on the sealing detection.

[0041] like Figures 5 and 6 As shown, the sealed product airtightness testing device further includes a control unit (PLC) and a control cabinet 6. The control unit is capable of controlling the operation of the sealed product airtightness testing device, and the control unit (PLC) is located within the control cabinet 6. The control unit stores the set value, and the pressure detection device 4 is connected to the control unit. The pressure detection device 4 can send the actual detected air pressure value to the control unit, and the control unit can compare the actual detected air pressure value with the set value.

[0042] The sealing and airtightness detection equipment for film-sealed products also includes a frame 5, and the sealing mechanism 1 and the air pressure supply device 3 are both connected to the frame 5. For example, the lower pressure cylinder 111, the support cylinder 121, the air supply pneumatic cylinder 31 and the piston drive mechanism 32 are all connected to the frame 5, and the pressure detection device 4 is connected to the air supply pneumatic cylinder 31.

[0043] The transport mold 2 is an elongated structure extending horizontally. It is provided with multiple product-receiving cavities 21 spaced apart in the horizontal direction. The height of the transport mold 2 is greater than or equal to the height of the product 7 being tested. The sealing mechanism 1, air pressure supply device 3, and pressure detection device 4 all correspond to the product-receiving cavities 21. The sealed product seal airtightness testing device can simultaneously test the seals of multiple products 7 being tested.

[0044] A film sealing product production line includes a transmission device and the above-mentioned film sealing product sealing airtightness detection equipment, and the transmission device can drive the transport mold 2 to move in the front-back direction.

[0045] The film-sealed product production line may further include a filling and packaging device, which may be an existing technology product. The filling and packaging device is located upstream of the film-sealed product sealing airtightness detection device. The filling and packaging device completes the filling and packaging processes in sequence to form the tested product 7. The robot places the tested product 7 into the product accommodating cavity 21 of the conveying mold 2. The transmission device may transport the conveying mold 2 and the tested product 7 to the airtightness detection station, that is, between the upper clamping assembly 11 and the lower clamping assembly 12.

[0046] The film-sealed product production line may further include packaging equipment, which is located downstream of the film-sealed product sealing and airtightness detection equipment. The transmission device may transport the conveying mold 2 and the tested product 7 to the packaging station, and the packaging equipment may remove the tested product 7 from the conveying mold 2 and pack it into boxes.

[0047] For example, the filling and packaging equipment can be located behind the film-sealed product sealing and airtightness testing equipment, and the packaging equipment can be located in front of the film-sealed product sealing and airtightness testing equipment. The conveying direction of the conveying device is from back to front.

[0048] The following describes a method for detecting airtightness of sealed film products. The method employs the aforementioned airtightness detection device for sealed film products and includes the following steps:

[0049] Step 1: The product 7 to be tested is placed in the product receiving chamber 21, and the sealing mechanism 1 makes the product receiving chamber 21 a sealed cavity;

[0050] Step 2: The air pressure supply device 3 supplies a set volume of gas into the product containing chamber 21 to increase the air pressure in the product containing chamber 21, and the pressure detection device 4 detects the air pressure in the product containing chamber 21; when the pressure detection device 4 detects that the air pressure in the product containing chamber 21 is greater than or equal to the set value, the tested product 7 is a qualified product; when the pressure detection device 4 detects that the air pressure in the product containing chamber 21 is less than the set value, the tested product 7 is an unqualified product.

[0051] The following is a detailed description of the airtightness testing method for the sealing film product.

[0052] Step 1: Initially, the upper pressure cover 112 is located at the upper limit position, the support cover 122 is located at the lower limit position, and the piston 311 of the air supply cylinder 31 is located at the upper limit position.

[0053] The conveying device transports a batch of tested products 7 to the air tightness testing station, that is, the product containing cavity 21 of the transporting mold 2 contains the tested products 7 (such as coffee capsules), and the conveying device transports the transporting mold 2 between the upper clamping assembly 11 and the lower clamping assembly 12.

[0054] The lower pressure cylinder 111 drives the upper pressure cover 112 to move downward. At the same time, the support cylinder 121 drives the support cover 122 to move upward. The upper pressure cover 112, the conveying mold 2 and the support cover 122 are connected in sequence, so that the product holding cavity 21 becomes a sealed cavity, which is isolated from the external environment of the conveying mold 2.

[0055] Step 2, the piston drive mechanism 32 is actuated, causing the piston 311 of the air supply pneumatic cylinder 31 to move from the upper limit position to the lower limit position, and the gas in the rodless chamber of the air supply pneumatic cylinder 31 is transported to the product accommodating chamber 21 through the air supply pipeline 33, thereby increasing the air pressure in the product accommodating chamber 21. At this time, the product accommodating chamber 21 is in the detection state, and the air pressure in the product accommodating chamber 21 can reach the set value. The piston 311 of the air supply pneumatic cylinder 31 remains stationary to maintain pressure, and the pressure detection device 4 detects the air pressure in the product accommodating chamber 21.

[0056] According to the ideal gas state equation: P×V=n×R×T, P×V is a constant. When V decreases, P increases inversely. If V is compressed by the same amount each time, the pressure P also changes by the same amount each time. During the process of maintaining pressure while the piston 311 of the air supply cylinder 31 remains stationary, after the rodless chamber of the air supply cylinder 31 is compressed and the compression is maintained for the specified time, the pressure within the product holding chamber 21 will maintain a stable pressure value. The pressure detection device 4 can transmit the actual detected pressure value to the control unit, that is, the pressure detection device 4 converts the actual detected pressure value into a digital analog signal that can be recognized by the control unit (PLC).

[0057] Specifically, good products (qualified products with good sealing properties) are placed in the mechanism in advance. When the product accommodating chamber 21 is in the detection state, the air pressure value actually detected by the pressure detection device 4 is the standard pressure value a0 (ie, the set value).

[0058] During the actual pressure maintenance process, the PLC will read at least three sets of actually detected air pressure values: the three sets of actually detected air pressure values ​​are a1, a2, and a3 respectively.

[0059] The PLC processes and analyzes the data: a1, a2, a3. The smallest pressure value among a1, a2 and a3 is analyzed and compared as a(min). If a(min) ≥ a0, the tested product 7 is a good product; if a(min) < a0, the tested product 7 is a defective product with poor sealing.

[0060] Repeating steps 1 and 2 in sequence, the sealing product airtightness detection equipment, production line and detection method of the present invention can perform airtightness detection on all products, which not only provides accurate detection results but also avoids possible missed detections in random inspections.

[0061] The entire testing process is carried out in a closed space, and the pressure environment needs to be established quickly and accurately without affecting the testing efficiency. The same standard value can be used to compare each product, so that all products can be tested for air tightness in a short period of time with unified standards.

[0062] The above description is merely a specific embodiment of the present invention and is not intended to limit the scope of the present invention. Therefore, substitutions of equivalent components, or equivalent changes and modifications made within the scope of protection of the present invention, should still fall within the scope of the present invention. Furthermore, the technical features, technical features, technical solutions, technical solutions, and embodiments of the present invention may be freely combined.

Claims

1. A sealing product airtightness detection device, characterized in that: The sealed film product sealing airtightness detection device comprises: a sealing mechanism (1), a conveying mold (2), an air pressure supply device (3) and a pressure detection device (4); a product accommodating cavity (21) is provided in the conveying mold (2); the product accommodating cavity (21) can accommodate the product to be tested (7); the sealing mechanism (1) can make the product accommodating cavity (21) a sealed cavity; the air pressure supply device (3) can supply a set volume of gas into the product accommodating cavity (21) and increase the air pressure in the product accommodating cavity (21); and the pressure detection device (4) can detect the air pressure in the product accommodating cavity (21).

2. The sealing airtightness detection equipment for film-sealed products according to claim 1, characterized in that: The upper end and the lower end of the product accommodating chamber (21) are both in an open state. The closing mechanism (1) comprises an upper clamping assembly (11) and a lower clamping assembly (12). The upper clamping assembly (11) can seal the upper end of the product accommodating chamber (21), and the lower clamping assembly (12) can seal the lower end of the product accommodating chamber (21).

3. The sealing airtightness detection equipment for film-sealed products according to claim 2, characterized in that: The upper clamping assembly (11) is located above the transporting mold (2). The upper clamping assembly (11) includes a lower pressure cylinder (111) and an upper pressure cover (112) connected up and down. The lower pressure cylinder (111) can drive the upper pressure cover (112) to move up and down, and the upper pressure cover (112) can be sealed and connected to the upper end of the transporting mold (2).

4. The airtightness detection equipment for sealing film products according to claim 2, characterized in that: The lower clamping assembly (12) is located below the transport mold (2). The lower clamping assembly (12) includes a support cylinder (121) and a support cover (122) connected at the bottom and top. The support cylinder (121) can drive the support cover (122) to move up and down, and the support cover (122) can be sealed and connected to the lower end of the transport mold (2).

5. The airtightness detection equipment for sealed film products according to claim 3, characterized in that: The air pressure supply device (3) includes an air supply cylinder (31), a piston drive mechanism (32) and an air supply pipeline (33). The air supply cylinder (31) includes a piston (311) and a piston chamber (312). The piston drive mechanism (32) can drive the piston (311) to move. The air supply cylinder (31) is connected to the upper pressure cover (112) through the air supply pipeline (33), and the piston chamber (312) can be communicated with the product accommodating chamber (21).

6. The airtightness detection equipment for sealing film products according to claim 5, characterized in that: The piston chamber (312) includes a rod chamber and a rodless chamber. An air outlet (313) is provided on the air supply cylinder (31), and the air outlet (313) is communicated with the rodless chamber of the piston chamber (312). An air inlet (113) is provided on the upper pressure cover (112). One end of the air supply pipeline (33) is connected to the air outlet (313), and the other end of the air supply pipeline (33) is connected to the air inlet (113). When the sealing mechanism (1) makes the product containing chamber (21) become a sealed cavity, the gas in the rodless chamber of the piston chamber (312) can enter the product containing chamber (21) through the air supply pipeline (33). The air pressure in the rodless chamber of the piston chamber (312), the air pressure in the air supply pipeline (33) and the air pressure in the product containing chamber (21) are all the same.

7. The airtightness detection equipment for sealed film products according to claim 6, characterized in that: The pressure detection device (4) is connected to the gas supply line (33) via the connecting line (41) and the tee (34) in sequence, and the pressure detection device (4) can measure the gas pressure in the gas supply line (33).

8. The airtightness detection equipment for sealing film products according to claim 2, characterized in that: The transport mold (2) is in a long strip structure and extends in the left-right direction. A plurality of product accommodating cavities (21) are provided in the transport mold (2). The plurality of product accommodating cavities (21) are arranged at intervals in the left-right direction. The sealing mechanism (1), the air pressure supply device (3) and the pressure detection device (4) all correspond to the product accommodating cavities (21) in a one-to-one manner.

9. A film sealing product production line, characterized in that: The film-sealing product production line comprises a transmission device and the film-sealing product sealing airtightness detection equipment according to claim 8, wherein the transmission device is capable of driving the transport mold (2) to move in the front-rear direction.

10. A method for detecting the airtightness of a sealed film product, characterized in that: The method for detecting airtightness of sealed film products uses the device for detecting airtightness of sealed film products according to claim 1, and the method for detecting airtightness of sealed film products comprises the following steps: Step 1: The product to be tested (7) is placed in the product receiving chamber (21), and the sealing mechanism (1) makes the product receiving chamber (21) a sealed cavity; Step 2: The air pressure supply device (3) supplies a set volume of gas into the product containing chamber (21) to increase the air pressure in the product containing chamber (21), and the pressure detection device (4) detects the air pressure in the product containing chamber (21); when the pressure detection device (4) detects that the air pressure in the product containing chamber (21) is greater than or equal to the set value, the tested product (7) is a qualified product; when the pressure detection device (4) detects that the air pressure in the product containing chamber (21) is less than the set value, the tested product (7) is an unqualified product.

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