Gas content detection equipment and method for packaging bag

Abstract

The invention relates to the technical field of packaging quality detection, and provides a gas content detection device and method for a packaging bag, and the device comprises a detection rack, a loading mechanism, and a first range finder. Wherein the loading mechanism comprises a first driving assembly, a bottom plate and a pressing plate and is used for driving the bottom plate and the pressing plate to move relatively, and the first distance measuring instrument is used for detecting the displacement of the bottom plate. Furthermore, the equipment further comprises an air tightness detection mechanism, the air tightness detection mechanism is composed of a detection box, a negative pressure source and a second distance measuring instrument, the interior of the detection box can be vacuumized, and the height of the packaging bag in the box can be detected. In addition, the detection box is provided with a feed port and a discharge port, and is equipped with a positioning clamp and a transmission mechanism, so that efficient and accurate gas content detection is realized. The effects of improving the detection precision and reducing the operation complexity are achieved.

Description

Technical Field

[0001] The present application relates to the technical field of packaging quality inspection, and in particular, to a gas content detection device and method for packaging bags. Background Art

[0002] In the packaging industry, especially in the packaging fields of food and medicine, the sealing performance and internal gas content of bagged products are important factors to ensure product quality and extend the shelf life. The quality control of bagged products has become increasingly important. As one of the important indicators to measure the quality of bagged products, the gas content plays a crucial role in ensuring packaging sealing and product protection.

[0003] The gas detection methods mainly include the puncture sampling method, near-infrared spectroscopy and Raman scattering technology. Although the puncture sampling method can provide accurate data, it will damage the packaging integrity and is not suitable for the quality control of finished products. Although near-infrared spectroscopy and Raman scattering technology can complete the detection of the gas content in the bag without damaging the packaging, they can only test the light-transmitting packaging bags, which has certain limitations. Summary of the Invention

[0004] In order to detect the gas content of opaque packaging bags without damaging the packaging, the present application provides a gas content detection device and method for packaging bags.

[0005] On the one hand, the present application provides a gas content detection device for packaging bags, adopting the following technical solutions: Including: A detection frame, including a detection table and a mounting frame body arranged on the detection table; A loading mechanism, arranged on the detection frame, including a first driving component, a bottom plate and a pressing plate, the bottom plate and the pressing plate are arranged oppositely, and the first driving component is used to drive the bottom plate and the pressing plate to move relatively; A first rangefinder, arranged on the detection table, for monitoring the displacement of the bottom plate.

[0006] By adopting the above technical solutions, the detection frame provides a stable detection platform. The loading mechanism makes the bottom plate and the pressing plate move relatively through the first driving component, so as to apply a certain pressure to the packaging bag, causing the packaging bag to deform. The first rangefinder detects the displacement of the bottom plate, which can indirectly reflect the deformation of the packaging bag after being pressed. According to the deformation situation of the packaging bag under a certain pressure, the gas content in the packaging bag is judged. It not only avoids the destructiveness of puncture sampling, but also overcomes the limitation that near-infrared spectroscopy and Raman scattering technology are only applicable to light-transmitting packaging bags, and improves the applicable range of detection.

[0007] Optionally, positioning holes are formed on the bottom plate.

[0008] By adopting the above technical solution, the positioning holes opened on the bottom plate can improve the position accuracy of the packaging bag during the detection process, avoid measurement errors caused by position deviation, and thus improve the accuracy of the detection result.

[0009] Optionally, it further includes an airtightness detection mechanism. The airtightness detection mechanism includes a detection box, a negative pressure source, and a second distance measuring instrument disposed in the detection box. The negative pressure source is communicated with the detection box and is used to evacuate the inside of the detection box. The second distance measuring instrument is used to detect the height of the packaging bag in the detection box.

[0010] By adopting the above technical solution, when the packaging bag to be detected is placed in the detection box and the negative pressure source evacuates the inside of the detection box, if the packaging bag has a leak, the gas inside the packaging bag will be drawn out during the evacuation of the detection box, resulting in a change in the height of the packaging bag. This change can be accurately measured by the second distance measuring instrument to determine the airtightness of the packaging bag, and the detected packaging bags with leaks will not participate in the gas content detection.

[0011] Optionally, the detection box includes a box body, a first closing plate, and a second closing plate. The first closing plate and the second closing plate are both movably disposed on the box body. An inlet is opened at one end of the box body, and an outlet is opened at the other end of the box body. The first closing plate is used to open and close the inlet, and the second closing plate is used to open and close the outlet.

[0012] By adopting the above technical solution, the first closing plate and the second closing plate are respectively used to open and close the inlet and the outlet, ensuring the smooth entry and exit of the packaging bag during the detection process and ensuring that the detection box is in a closed state when evacuating.

[0013] Optionally, a positioning fixture is disposed in the box body. The positioning fixture includes a second driving component and two relatively arranged positioning strips. The second driving component is used to drive the two positioning strips to move relatively.

[0014] By adopting the above technical solution, the setting of the positioning fixture can effectively fix the packaging bag to be detected and prevent the accuracy of the detection result from being affected by the position change of the packaging bag during the detection process. The second driving component drives the two positioning strips to move relatively, which can adapt to packaging bags of different sizes, improving the applicable range and operation flexibility of the equipment.

[0015] Optionally, protective soft pads are further fixed on the side walls of the two positioning strips facing each other.

[0016] By adopting the above technical solution, the protective soft pads can effectively prevent damage to the packaging bag during the detection process, ensure the integrity and safety of the packaging bag, and thus improve the reliability of the detection result.

[0017] Optionally, the conveying mechanism includes a first conveyor line, a second conveyor line, and a third conveyor line. The first conveyor line is located on one side of the box body where the feeding port is provided. The second conveyor line is located inside the box body. The third conveyor line is located on one side of the box body where the discharging port is provided, and one end of the third conveyor line extends to the detection rack.

[0018] By adopting the above technical solution, the first conveyor line is located on one side of the box body where the feeding port is provided, responsible for feeding the packaging bags to be detected into the detection box, ensuring the continuity and automation of the detection process. The second conveyor line is located inside the box body, used to realize the stable transmission of the packaging bags in the detection box, so as to transport the packaging bags at the end of the first conveyor line into the box body and send out the packaging bags that have been detected in the box body to the third conveyor line; the third conveyor line is located on one side of the box body where the discharging port is provided, and one end of the third conveyor line extends to the detection rack, responsible for transporting the packaging bags that have completed the detection to the detection rack for subsequent gas content detection.

[0019] Optionally, a first sliding rail is provided on the side wall of the box body where the feeding port is provided, and the first closing plate is slidably connected to the first sliding rail; A second sliding rail is provided on the side wall of the box body where the discharging port is provided, and the second closing plate is slidably arranged on the second sliding rail; A lifting source is provided on the box body, and the lifting source is used to drive the first closing plate and the second closing plate to slide simultaneously.

[0020] By adopting the above technical solution, by providing a first sliding rail on the side wall of the feeding port of the box body and a second sliding rail at the discharging port end, the first closing plate and the second closing plate can slide smoothly along their respective sliding rails, so as to accurately open and close the feeding port and the discharging port. When the negative pressure source evacuates the detection box, it effectively prevents external air from entering the detection box and maintains the stability of the detection environment. The lifting source is used to drive the sliding of the first closing plate and the second closing plate simultaneously, simplifying the operation process.

[0021] Optionally, a linkage bracket is connected between the first closing plate and the second closing plate, and the lifting source is used to drive the linkage bracket to move in the vertical direction.

[0022] By adopting the above technical solution, a linkage bracket is arranged between the first closing plate and the second closing plate, and the lifting source is used to drive the linkage bracket to move in the vertical direction, which can open and close the feeding port and the discharging port of the detection box synchronously.

[0023] On the one hand, the present application provides a method for detecting gas content, which uses the above-mentioned gas content detection equipment for packaging bags to detect the gas content.

[0024] In summary, the present application includes at least one of the following beneficial effects: 1. The loading mechanism in the present application cooperates with the first distance measuring instrument. The loading mechanism makes the bottom plate and the pressing plate move relatively through the first driving component, thereby applying a certain pressure to the packaging bag, causing the packaging bag to deform. The first distance measuring instrument detects the displacement of the bottom plate, which can indirectly reflect the deformation of the packaging bag after being pressed. According to the deformation of the packaging bag under a certain pressure, the gas content in the packaging bag is judged.

[0025] 2. The present application not only avoids the destructiveness of puncture sampling, but also overcomes the limitations of near-infrared spectroscopy and Raman scattering technology, which are only applicable to transparent packaging bags, and improves the applicable range of detection.

[0026] 3. The positioning holes provided on the bottom plate in the present application help to improve the positioning accuracy during detection, ensure the consistency of the detection position each time, and further improve the accuracy and repeatability of detection. Description of the Drawings

[0027] Figure 1 is the overall structural schematic diagram of the gas content detection device for packaging bags in Embodiment 1 of the present application; Figure 2 is the overall structural schematic diagram of the sterile bag in Embodiment 1 of the present application; Figure 3 is the overall structural schematic diagram of the gas content detection device for packaging bags in Embodiment 2 of the present application; Figure 4 is the structural schematic diagram of the airtightness detection mechanism in Embodiment 2 of the present application; Figure 5 is the internal structural schematic diagram of the airtightness detection mechanism in Embodiment 2 of the present application; Description of the reference numerals: 1, detection frame; 11, detection table; 111, installation groove; 12, installation frame body; 2, loading mechanism; 21, first driving component; 211, first cylinder; 212, second cylinder; 22, bottom plate; 221, positioning hole; 23, pressing plate; 3, first distance measuring instrument; 4, airtightness detection mechanism; 41, detection box; 411, box body; 4111, feed inlet; 4112, discharge outlet; 412, first closing plate; 413, second closing plate; 42, first slide rail; 43, second slide rail; 44, negative pressure source; 45, second distance measuring instrument; 46, lifting source; 47, linkage bracket; 5, positioning fixture; 51, positioning strip; 52, protective soft pad; 53, second driving component; 531, first linear slide table module; 532, second linear slide table module; 6, transmission mechanism; 61, first conveyor line; 62, second conveyor line; 63, third conveyor line; 7, sterile bag; 71, bag body; 72, end cover. Detailed Description of the Embodiments

[0028] The following will further elaborate on this application in conjunction with the attached Figures 1 - 5 drawings.

[0029] Embodiment 1: Referring to Figure 1 , an air content detection device for a packaging bag provided by an embodiment of this application includes a detection frame 1, a loading mechanism 2, and a first distance measuring instrument 3. Among them, the detection frame 1 includes a detection table 11 and a mounting frame body 12 provided on the detection table 11; the mounting frame body 12 can be fixed to the detection table 11 by bolts, or can be connected by welding or other fixing methods. An installation groove 111 is opened on the detection table 11, and the first distance measuring instrument 3 is fixed in the installation groove 111. The first distance measuring instrument 3 can be a laser distance measuring instrument or an ultrasonic distance measuring instrument. The loading mechanism 2 includes a first driving component 21, a bottom plate 22, and a pressing plate 23, and the bottom plate 22 and the pressing plate 23 are arranged oppositely. The first driving member includes a first air cylinder 211 and a second air cylinder 212. The first air cylinder 211 is also fixed in the installation groove 111, and one end of the telescopic rod of the first air cylinder 211 is fixedly connected to the bottom plate 22; the second air cylinder 212 is fixed to the top of the mounting frame body 12, and one end of the telescopic rod of the second air cylinder 212 is fixedly connected to the pressing plate 23. Starting the first driving component 21 can drive the bottom plate 22 and the pressing plate 23 to move relatively.

[0030] Referring to Figure 1 and Figure 2 , taking the sterile bag 7 as an example. The sterile bag 7 includes a bag body 71, an inflation port communicated with the bag body 71, and an end cap 72 threadedly connected to the inflation port. A positioning hole 221 can be provided on the bottom plate 22. When placing the sterile bag 7 on the bottom plate 22, the end cap 72 is placed in the positioning hole 221 to define the installation position of the sterile bag 7 and prevent it from moving during the detection process. The shape and size of the pressing plate 23 can be adjusted according to the size of the sterile bag 7 to ensure a good contact area. In other embodiments, a chamfer can also be machined at the edge of the positioning hole 221 to reduce damage to the sterile bag 7.

[0031] The implementation principle of Embodiment 1 is as follows: Start the first cylinder 211 and the second cylinder 212 to drive the bottom plate 22 and the pressing plate 23 to move away from each other, and install the sterile bag 7 onto the bottom plate 22 through the positioning holes 221; then drive the first cylinder 211 to drive the pressing plate 23 to descend. Among them, when detecting sterile bags 7 of the same size and the same inflation standard, the descending stroke of the pressing plate 23 is a fixed value. Subsequently, start the second cylinder 212 to drive the sterile bag 7 to move upward, so that the pressing plate 23 and the bottom plate 22 jointly press the sterile bag 7, causing the sterile bag 7 to deform. When the pressure received by the sterile bag 7 reaches the preset value, the displacement of the bottom plate 22 is detected by the first distance measuring instrument 3, and by calculating the displacement of the bottom plate 22, the gas content inside the sterile bag 7 can be indirectly measured. This method does not require destroying the integrity of the sterile bag 7, is applicable to opaque sterile bags 7, and improves the accuracy and reliability of detection.

[0032] Embodiment 2: Referring to Figure 3 and Figure 4 This application provides a gas content detection device for packaging bags. The difference between this embodiment and the above embodiment is that it further includes an airtightness detection mechanism 4 and a transmission mechanism 6. The airtightness detection mechanism 4 includes a detection box 41, a negative pressure source 44, and a second distance measuring instrument 45 arranged inside the detection box 41. The detection box 41 includes a box body 411, a first closing plate and a second closing plate 413 movably arranged on the box body 411. One end of the box body 411 is provided with a feed inlet 4111, and the other end is provided with a discharge outlet 4112; a first slide rail 42 is fixed on the side wall of the box body 411 where the feed inlet 4111 is opened, and the first closing plate 412 is slidably connected to the first slide rail 42; a second slide rail 43 is fixed on the side wall of the box body 411 where the discharge outlet 4112 is opened, and the second closing plate 413 is slidably arranged on the second slide rail 43. A linkage bracket 47 is connected between the first closing plate 412 and the second closing plate 413, and the linkage bracket 47 is sleeved on the top of the box body 411. A lifting source 46 is arranged at the top of the box body 411. In this embodiment, the lifting source 46 is specifically set as a third cylinder. When the lifting source 46 is started to drive the linkage bracket 47 to lift and lower, it can drive the first closing plate 412 and the second closing plate 413 to slide, and simultaneously open and close the feed inlet 4111 and the discharge outlet 4112. The linkage bracket 47 connects the first closing plate 412 and the second closing plate 413 to ensure that the two move synchronously.

[0033] Referring to Figure 5, a positioning fixture 5 is also arranged at the middle position inside the box body 411. The positioning fixture 5 includes a second driving component 53 and two relatively arranged positioning bars 51. The second driving component 53 is used to drive the two positioning bars 51 to move relatively. Protective soft pads 52 are also fixed on the opposite side walls of the two positioning bars 51 to protect the sterile bag 7 from being damaged. In this embodiment, the second driving component 53 includes a first linear slide module 531 and a second linear slide module 532 which are relatively arranged, and both the first linear slide module 531 and the second linear slide module 532 are driven by a motor screw rod. The first linear slide module 531 includes a first slide, and one end of a positioning bar 51 is fixedly connected to the first slide; the second linear slide module 532 includes a second slide, and one end of the other positioning bar 51 is fixedly connected to the second slide. Starting the first linear slide module 531 and the second linear slide module 532 simultaneously is used to drive the positioning bars 51 to move relatively. When the sterile bag 7 moves between the two positioning bars 51, the sterile bag 7 can be effectively fixed by the positioning fixture 5 to prevent it from displacing during the detection process. On the other hand, the relative movement of the positioning bars 51 can adjust the position of the sterile bag 7 to make it in the best detection state. The protective soft pads 52 can protect the sterile bag 7 from being damaged and improve the safety and reliability of the detection.

[0034] Refer to Figure 3 and Figure 5 , a negative pressure source 44 is communicated with the detection box 41 and is used to evacuate the inside of the box body 411. The second distance measuring instrument 45 can be a laser distance measuring instrument or an ultrasonic distance measuring instrument and is used to detect the height change of the sterile bag 7 inside the box body 411. In this embodiment, the negative pressure source 44 selects a vacuum pump, and the negative pressure source 44 is used to evacuate the inside of the detection box 41. By evacuating the air, the airtightness of the sterile bag 7 can be detected. If the sterile bag 7 has a leak, its height will change, and the second distance measuring instrument 45 can capture this change. Through the airtightness detection mechanism 4, the airtightness of the sterile bag 7 can be detected without damaging the sterile bag 7.

[0035] Refer to Figure 3 and Figure 4 , the transmission mechanism 6 includes a first conveyor line 61, a second conveyor line 62, and a third conveyor line 63. The first conveyor line 61 is located on one side of the box body 411 where the feed inlet 4111 is opened, the second conveyor line 62 is located inside the box body 411, and the third conveyor line 63 is located on one side of the box body 411 where the discharge outlet 4112 is opened, and one end of the third conveyor line 63 extends to the detection rack 1. The first conveyor line 61, the second conveyor line 62, and the third conveyor line 63 can be belt conveyors or chain plate conveyors and are used to automatically convey the sterile bag 7. The first conveyor line 61 feeds the sterile bag 7 to be detected into the detection box 41, the second conveyor line 62 conveys inside the detection box 41, and the third conveyor line 63 sends out the detected sterile bag 7 from the detection box 41.

[0036] Through the transmission mechanism 6, the automatic detection of the sterile bag 7 is realized, and the detection efficiency is improved. The first conveyor line 61 feeds the sterile bag 7 to be detected into the detection box 41, the second conveyor line 62 conveys inside the detection box 41, and the third conveyor line 63 sends out the detected sterile bag 7 from the detection box 41.

[0037] In other embodiments, a rejection mechanism may be provided on one side of the third conveyor line 63. The rejection mechanism may be a robotic arm or a rejection push rod slidably arranged on one side of the third conveyor line 63; the unqualified sterile bags 7 conveyed out of the box body 411 are pushed off from the third conveyor line 63.

[0038] The implementation principle of this Embodiment 2 is as follows: The sterile bags 7 to be detected are sequentially placed on the first conveyor line 61. The first conveyor line 61 feeds the sterile bags 7 to be detected into the detection box 41. The lifting source 46 is started to drive the first closing plate 412 and the second closing plate 413 to descend simultaneously to close the feed inlet 4111 and the discharge outlet 4112. After the second conveyor line 62 transports the sterile bag 7 to the positioning fixture 5, the second driving assembly 53 is started to clamp the sterile bag 7 and adjust the position of the sterile bag 7. Then, the negative pressure source 44 is started to evacuate the inside of the detection box 41. The height change of the sterile bag 7 is detected by the second distance measuring instrument 45. If the sterile bag 7 leaks, its height will change, thereby judging the airtightness of the sterile bag 7. After the detection is completed, the lifting source 46 is started again to drive the first closing plate 412 and the second closing plate 413 to rise simultaneously to close the feed inlet 4111 and the discharge outlet 4112. The second conveyor line 62 moves the sterile bag 7 out of the box body 411 and transports it onto the third conveyor line 63. The third conveyor line 63 transports the detected sterile bag 7 to one side of the detection rack 1 for convenient air content detection on the detection rack 1.

[0039] Embodiment 3: The embodiment of the present application provides a method for detecting the air content, using the air content detection device for packaging bags in Embodiment 1 or Embodiment 2 to detect the air content of the sterile bag 7.

[0040] The above are all the preferred embodiments of the present application. Without limiting the protection scope of the present application accordingly, therefore: All equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A gas content detection device for packaging bags, characterized in that: include: A detection frame (1) comprising a detection table (11) and a mounting frame (12) arranged on the detection table (11); The loading mechanism (2) is arranged on the detection frame (1), and comprises a first driving assembly (21), a base plate (22) and a pressing plate (23), wherein the base plate (22) and the pressing plate (23) are arranged relative to each other, and the first driving assembly (21) is used to drive the base plate (22) and the pressing plate (23) to move relative to each other; A first distance meter (3) is arranged on the detection platform (11) and is used to monitor the displacement of the bottom plate (22).

2. The gas content detection device for packaging bags according to claim 1, characterized in that: The bottom plate (22) is provided with a positioning hole (221).

3. The gas content detection device for packaging bags according to claim 2, characterized in that: The invention also comprises an airtightness detection mechanism (4), the airtightness detection mechanism (4) comprising a detection box (41), a negative pressure source (44) and a second distance meter (45) arranged in the detection box (41), the negative pressure source (44) being in communication with the detection box (41) and being used for performing a vacuum treatment on the interior of the detection box (41), and the second distance meter (45) being used for detecting the height of the packaging bag in the detection box (41).

4. The gas content detection device for packaging bags according to claim 3, characterized in that: The detection box (41) comprises a box body (411), a first closing plate (412) and a second closing plate (413); the first closing plate (412) and the second closing plate (413) are both movably arranged on the box body (411); A feed port (4111) is provided at one end of the box body (411), and a discharge port (4112) is provided at the other end of the box body (411); the first closing plate (412) is used to open and close the feed port (4111), and the second closing plate (413) is used to open and close the discharge port (4112).

5. The gas content detection device for packaging bags according to claim 4, characterized in that: A positioning fixture (5) is arranged in the box body (411), and the positioning fixture (5) comprises a second driving component (53) and two positioning bars (51) arranged opposite to each other, and the second driving component (53) is used to drive the two positioning bars (51) to move relative to each other.

6. The gas content detection device for packaging bags according to claim 5, characterized in that: Protective cushions (52) are also fixed on the opposite side walls of the two positioning strips (51).

7. The gas content detection device for packaging bags according to claim 4, characterized in that: The invention also comprises a transmission mechanism (6), wherein the transmission mechanism (6) comprises a first conveying line (61), a second conveying line (62) and a third conveying line (63), wherein the first conveying line (61) is located at a side of the box body (411) on which a feed port (4111) is provided, the second conveying line (62) is located inside the box body (411), and the third conveying line (63) is located at a side of the box body (411) on which a discharge port (4112) is provided, and one end of the third conveying line (63) extends to the detection frame (1).

8. The gas content detection device for packaging bags according to claim 4, characterized in that: A first slide rail (42) is provided on the side wall of the box body (411) on which the feed port (4111) is opened, and the first closing plate (412) is slidably connected to the first slide rail (42); A second slide rail (43) is provided on the side wall of the box body (411) on which the material discharge port (4112) is opened, and the second closing plate (413) is slidably arranged on the second slide rail (43); The box body (411) is provided with a lifting source (46), and the lifting source (46) is used to simultaneously drive the first closing plate (412) and the second closing plate (413) to slide.

9. The gas content detection device for packaging bags according to claim 8, characterized in that: A linkage bracket (47) is connected between the first closing plate (412) and the second closing plate (413), and the lifting source (46) is used to drive the linkage bracket (47) to move in a vertical direction.

10. A method for detecting gas content, characterized in that: The gas content detection device for packaging bags as described in any one of claims 1 to 9 is used to detect the gas content.

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