A sealing detection device for seafood packaging

Abstract

The present invention relates to the technical field of sealing performance testing, and particularly relates to a sealing detection device for seafood packaging, which includes a test cylinder, a lifting frame, and a lifting drive mechanism. An upper cover, an intermediate partition plate, and a lower cover are provided on the lifting frame. The intermediate partition plate is fixed on the lifting frame. Both the upper and lower ends of the test cylinder are open. The upper cover is located above the test cylinder, the lower cover is located below the test cylinder, and the intermediate partition plate is located inside the test cylinder and is in sealed sliding fit with the inner wall of the test cylinder. The intermediate partition plate divides the interior of the test cylinder into upper and lower test chambers. When the lifting frame moves downward, the upper cover seals the upper opening of the test cylinder to detect the sealing performance of the flexible packaging in the upper test chamber. When the lifting frame moves upward, the upper cover opens the upper opening of the test cylinder, and the lower cover seals the lower opening of the test cylinder to detect the sealing performance of the flexible packaging in the lower test chamber. The present invention solves the technical problem of low efficiency in detecting the sealing performance of flexible packaging in the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of sealing performance testing, and particularly relates to a sealing detection device for seafood packaging. Background Art

[0002] The main methods for testing the sealing degree of flexible packages are the water immersion weighing method and the negative pressure air extraction method. Among them, the negative pressure air extraction method is the most feasible method for testing the sealing degree and has good test repeatability. The main working process of the negative pressure air extraction method is as follows: First, a measurement hole is cut with scissors on the flexible package to be measured, and the measurement hole of the flexible package is docked with the sealing connector inside the test cylinder. The inside of the flexible package is communicated with the outside of the test cylinder through the sealing connector. The test cylinder is connected to a vacuum pump. When the vacuum pump is started to suck the air inside the test cylinder, the air outside the test cylinder enters the inside of the flexible package through the sealing connector, and the air inside the flexible package enters the test cylinder through the leakage point and is pumped out by the vacuum pump. During this process, the pressure inside the test cylinder will continuously decrease and reach a stable value and then remain unchanged. At this time, the pressure sensor on the test cylinder will display a constant pressure value, and this pressure value is the finally measured sealing degree value. The better the sealing degree of the flexible package, the lower the pressure value of the test cylinder. Conversely, the greater the pressure value.

[0003] The existing sealing detection structure can only detect one flexible package at a time. When detecting, it is necessary to wait until the detection of one flexible package is completely finished before the sealing detection of the second flexible package can be carried out, resulting in low detection efficiency. Summary of the Invention

[0004] To overcome the deficiencies of the prior art, the present invention provides a sealing detection device for seafood packaging to solve the technical problem of low detection efficiency of the sealing performance of flexible packages in the prior art.

[0005] The sealing detection device for seafood packaging of the present invention adopts the following technical solutions:

[0006] A sealing detection device for seafood packaging, comprising a test cylinder with an axis extending in the up and down direction, further comprising a lifting frame and a lifting drive mechanism for driving the lifting frame to lift in the up and down direction. An upper cover, an intermediate partition and a lower cover are successively arranged on the lifting frame from top to bottom. The intermediate partition is fixed on the lifting frame so as to be able to lift synchronously with the lifting frame. Both the upper and lower ends of the test cylinder are open. The lifting frame penetrates through both ends of the test cylinder. The upper cover is located above the test cylinder, the lower cover is located below the test cylinder, and the intermediate partition is located inside the test cylinder and is in sealed sliding fit with the inner wall of the test cylinder. The intermediate partition divides the interior of the test cylinder into two upper and lower test chambers, namely an upper test chamber and a lower test chamber. Pressure sensors are respectively connected to the upper cover and the lower cover, and the pressure sensors are used to respectively detect the pressures in the upper test chamber and the lower test chamber. When the lifting frame moves downward, the upper cover plugs the opening at the upper end of the test cylinder to detect the sealing performance of the flexible packaging in the upper test chamber. When the lifting frame moves upward, the upper cover opens the opening at the upper end of the test cylinder, and the lower cover plugs the opening at the lower end of the test cylinder to detect the sealing performance of the flexible packaging in the lower test chamber.

[0007] Further, the lifting frame includes a lifting rod extending in the up and down direction. The upper cover and the lower cover are both slidably arranged on the lifting rod in the up and down direction. An upper compression spring is arranged on the upper side of the upper cover. The upper compression spring is sleeved on the lifting rod, and its two ends are respectively connected to the upper cover and the lifting frame. A lower compression spring is arranged on the lower side of the lower cover. The lower compression spring is sleeved on the lifting rod, and its two ends are respectively connected to the lower cover and the lifting frame.

[0008] Further, an upper sealing connecting piece is arranged on the lower side of the upper cover, and a lower sealing connecting piece is arranged on the lower side of the intermediate partition. Both the upper sealing connecting piece and the lower sealing connecting piece include a first clamping block and a second clamping block. The first clamping block is fixedly arranged, and a sealing air connection head is arranged on the first clamping block. One end of the first clamping block is hinged to one end of the second clamping block, and a locking structure is arranged between the other end of the first clamping block and the other end of the second clamping block. The locking structure is used to clamp the edge of the measurement hole of the flexible packaging by the first clamping block and the second clamping block so that the sealing air connection head is in sealed connection with the measurement hole on the flexible packaging.

[0009] Further, the locking structure includes a locking bolt rotatably arranged on the second clamping block and a threaded hole opened on the first clamping block. Rotating the locking bolt makes one end of the locking bolt threadedly connected to the threaded hole, and then the first clamping block and the second clamping block clamp the edge of the measurement hole of the flexible packaging.

[0010] Further, the sealed air connection head includes a docking plate and a suction pipe. An air vent is provided at the center of the docking plate. One end of the suction pipe is connected to the docking plate and communicates with the air vent. A sealing sleeve is provided on the periphery of the suction pipe. A clamping notch for accommodating the suction pipe is provided on the first clamping block. A first air inlet channel is provided inside the upper cover. A second air inlet channel is provided in the middle partition plate and the lifting rod. One end of the first air inlet channel is docked with the docking plate of the upper sealing connector, and the other end communicates with the outside of the test cylinder, so that the air outside the test cylinder enters the flexible packaging inside the upper test chamber. One end of the second air inlet channel is docked with the docking plate of the lower sealing connector, and the other end communicates with the outside of the test cylinder, so that the air outside the test cylinder enters the flexible packaging inside the lower test chamber.

[0011] Further, two lifting rods are arranged in parallel at intervals. Through holes for the corresponding lifting rods to pass through are respectively provided on the upper cover and the lower cover. The upper compression spring and the lower compression spring are respectively sleeved on each lifting rod. Each lifting rod includes an upper rod section and a lower rod section spliced coaxially together. A threaded column is provided at the upper end of the lower rod section, and a threaded connection hole for cooperating with the threaded column is correspondingly provided at the lower end of the upper rod section. The lower rod section is connected to the upper rod section through the threaded column and the threaded connection hole. A through hole for the threaded column to pass through is provided on the middle partition plate. The middle partition plate is clamped and fixed between the upper rod section and the lower rod section.

[0012] Further, the sealing performance detection device for seafood packaging further includes a cabinet body. A fixing frame is provided at the bottom of the cabinet body. Mounting holes are provided on the fixing frame. The test cylinder is fixed in the mounting holes of the fixing frame.

[0013] Further, a support frame is fixed above the test cylinder inside the cabinet body. The lifting drive mechanism includes a drive motor and a lead screw connected to the drive motor. The drive motor is installed on the upper side of the support frame. The lead screw extends in the up and down direction and is arranged between the support frame and the fixing frame. The upper end of the lead screw is connected to the output shaft of the drive motor. A rotation hole is provided at the top of the fixing frame. The lower end of the lead screw is rotatably arranged in the rotation hole. A moving bracket is connected to the lead screw. The lifting rod is connected to the moving bracket. The rotation of the lead screw drives the moving bracket to move in the up and down direction, and further drives the lifting rod to move up and down.

[0014] Further, two drive motors and two lead screws are respectively provided. The two lead screws are respectively arranged on the opposite sides of the test cylinder. The moving bracket includes a cross beam and two nuts respectively fixed at both ends of the cross beam. The two nuts are respectively sleeved on the corresponding lead screws. The synchronous rotation of the two lead screws drives the moving bracket to move in the up and down direction.

[0015] Further, a connection disk is fixed in the middle of the cross beam. The connection disk is located below the cross beam, and the upper ends of the two lifting rods are respectively fixedly connected to the lower side of the connection disk.

[0016] The beneficial effects of the present invention are as follows: For a sealing performance detection device for seafood packaging of the present invention, both the upper and lower ends of the measuring cylinder are set as openings, and then the lifting frame penetrates through the measuring cylinder. An upper sealing cover, an intermediate partition plate, and a lower sealing cover are sequentially arranged on the lifting frame. The intermediate partition plate divides the measuring cylinder into upper and lower two test chambers. When the lifting frame moves up and down, the two test chambers can alternately work to detect the sealing degree of the flexible packaging, which can improve the detection efficiency. At the same time, the present invention utilizes the up and down movement of the intermediate partition plate to generate negative pressure in the upper and lower two test chambers, thereby omitting the setting of a vacuum pump and saving energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to these drawings. Those skilled in the art should understand that these drawings are not necessarily drawn to scale.

[0018] Figure 1 is a three-dimensional schematic diagram of an embodiment of a sealing performance detection device for seafood packaging of the present invention;

[0019] Figure 2 is an exploded schematic diagram of an embodiment of a sealing performance detection device for seafood packaging of the present invention;

[0020] Figure 3 is Figure 2 an enlarged schematic diagram of the partial area A in

[0021] Figure 4 is an assembly schematic diagram (front view) of an embodiment of a sealing performance detection device for seafood packaging of the present invention;

[0022] Figure 5 is a state diagram of an embodiment of a sealing performance detection device for seafood packaging of the present invention after the lifting frame rises;

[0023] Figure 6 is a state diagram of an embodiment of a sealing performance detection device for seafood packaging of the present invention after the lifting frame descends;

[0024] Figure 7 is a side view of an embodiment of a sealing performance detection device for seafood packaging of the present invention after the lifting frame descends;

[0025] In the figure: 101, cabinet body; 200, support frame; 201, drive motor; 202, lead screw; 203, moving bracket; 2031, nut; 2032, connecting plate; 204, upper cover; 2041, through hole; 2042, first air inlet channel; 2043, pressure sensor; 205, test cylinder; 2050, lifting frame; 2051, lifting rod; 2052, upper compression spring; 2053, lower compression spring; 2054, second air inlet channel; 2055, upper test chamber; 2056, lower test chamber; 206, lower cover; 207, fixing frame; 2071, rotating hole; 2072, mounting hole; 208, first clamping block; 2081, threaded hole; 2082, suction pipe; 2083, sealing sleeve; 2084, sealing strip; 209, locking bolt; 210, second clamping block; 2101, clamping notch; 211, intermediate partition; 212, upper sealing connector; 213, lower sealing connector. Specific embodiments

[0026] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0027] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequential or technical meanings. The terms "connection" and "coupling" used in this application, unless otherwise specified, both include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0028] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0029] An embodiment of a sealing detection device for seafood packaging according to the present invention is as Figures 1 to 7 shown. The sealing detection device for seafood packaging includes a test cylinder 205 whose axis extends in the up-and-down direction, and further includes a lifting frame 2050 and a lifting drive mechanism for driving the lifting frame 2050 to lift in the up-and-down direction. An upper cover 204, an intermediate partition 211 and a lower cover 206 are sequentially arranged on the lifting frame 2050 from top to bottom. The intermediate partition 211 is fixed on the lifting frame 2050 so as to be able to lift synchronously with the lifting frame 2050. Both the upper and lower ends of the test cylinder 205 are open. The lifting frame 2050 penetrates through both ends of the test cylinder 205. The upper cover 204 is located above the test cylinder 205, and the lower cover 206 is located below the test cylinder 205. The intermediate partition 211 is located inside the test cylinder 205 and is in sealed sliding fit with the inner wall of the test cylinder 205. The intermediate partition 211 divides the interior of the test cylinder 205 into two upper and lower test chambers, which are an upper test chamber 2055 and a lower test chamber 2056 respectively. When the lifting frame 2050 moves downward, the upper cover 204 seals the upper opening of the test cylinder 205 to perform a sealing detection on the flexible packaging in the upper test chamber 2055. When the lifting frame 2050 moves upward, the upper cover 204 opens the upper opening of the test cylinder 205, and the lower cover 206 seals the lower opening of the test cylinder 205 to perform a sealing detection on the flexible packaging in the lower test chamber 2056. Pressure sensors 2043 are respectively connected to the upper cover 204 and the lower cover 206, and the pressure sensors 2043 are used to respectively detect the pressures in the upper test chamber 2055 and the lower test chamber 2056.

[0030] In this embodiment, the sealing detection device for seafood packaging further includes a cabinet body 101. A fixing frame 207 is provided at the bottom of the cabinet body 101. An installation hole 2072 is provided on the fixing frame 207, and the test cylinder 205 is fixed in the installation hole 2072 of the fixing frame 207. A support frame 200 is fixed inside the cabinet body 101 above the test cylinder 205. The lifting drive mechanism includes a drive motor 201 and a lead screw 202 connected to the drive motor 201. The drive motor 201 is installed on the upper side of the support frame 200. The lead screw 202 extends in the up and down direction and is arranged between the support frame 200 and the fixing frame 207. The upper end of the lead screw 202 is connected to the output shaft of the drive motor 201. A rotation hole 2071 is formed at the top of the fixing frame 207, and the lower end of the lead screw 202 is rotatably arranged in the rotation hole 2071. A moving bracket 203 is connected to the lead screw 202. The lifting frame 2050 is connected to the moving bracket 203. When the lead screw 202 rotates, it drives the moving bracket 203 to move in the up and down direction, and further drives the lifting frame 2050 to move up and down.

[0031] In this embodiment, the lifting frame 2050 includes a lifting rod 2051 extending in the up and down direction. The upper cover 204 and the lower cover 206 are both slidably arranged on the lifting rod 2051 in the up and down direction. An upper compression spring 2052 is provided on the upper side of the upper cover 204. The upper compression spring 2052 is sleeved on the lifting rod 2051, and its two ends are respectively connected to the upper cover 204 and the lifting frame 2050. A lower compression spring 2053 is provided on the lower side of the lower cover 206. The lower compression spring 2053 is sleeved on the lifting rod 2051, and its two ends are respectively connected to the lower cover 206 and the lifting frame 2050. When the middle partition 211 is located at the middle position of the test cylinder 205, as Figure 4As shown, neither the upper cover 204 nor the lower cover 206 blocks the opening of the test cylinder 205. At this time, both the upper compression spring 2052 and the lower compression spring 2053 are in a natural elongation state. When the lifting frame 2050 drives the middle partition 211 to move upward from the middle position of the test cylinder 205, the lower cover 206 will rise with the lifting frame 2050 and gradually approach the opening at the lower end of the test cylinder 205. After the lower cover 206 contacts the opening at the lower end of the test cylinder 205, the lower cover 206 blocks the lower end of the test cylinder 205, forming a sealed space in the lower test chamber 2056. When the lifting frame 2050 drives the middle partition 211 to continue moving upward, at this time the lower cover 206 will slide relative to the lifting frame 2050 and compress the lower compression spring 2053. Under the elastic force of the lower compression spring 2053, the lower compression spring 2053 will push up the lower cover 206 upward, so that the lower cover 206 is tightly fitted with the lower end of the test cylinder 205. On the contrary, when the lifting frame 2050 drives the middle partition 211 to move downward from the middle position of the test cylinder 205, the upper cover 204 will descend with the lifting frame 2050 and gradually approach the opening at the upper end of the test cylinder 205. After the upper cover 204 contacts the opening at the upper end of the test cylinder 205, the upper cover 204 blocks the upper end of the test cylinder 205, forming a sealed space in the upper test chamber 2055. When the lifting frame 2050 drives the middle partition 211 to continue moving downward, at this time the upper cover 204 will slide relative to the lifting frame 2050 and compress the upper compression spring 2052. Under the elastic force of the upper compression spring 2052, the upper compression spring 2052 will squeeze the upper cover 204 downward, so that the upper cover 204 is tightly fitted with the upper end of the test cylinder 205.

[0032] In this embodiment, an upper sealing connector 212 is provided on the lower side of the upper cover 204, and a lower sealing connector 213 is provided on the lower side of the intermediate partition 211. Both the upper sealing connector 212 and the lower sealing connector 213 include a first clamping block 208 and a second clamping block 210. The first clamping block 208 is fixedly arranged, and a sealed air connection head is provided on the first clamping block 208. One end of the first clamping block 208 is hingedly connected to one end of the second clamping block 210. A locking structure is provided between the other end of the first clamping block 208 and the other end of the second clamping block 210. In this embodiment, the locking structure includes a locking bolt 209 rotatably arranged on the second clamping block 210 and a threaded hole 2081 opened on the first clamping block 208. When the locking bolt 209 is rotated so that one end of the locking bolt 209 is threadedly connected to the threaded hole 2081, the first clamping block 208 and the second clamping block 210 are clamped to each other. The locking structure is used to clamp the first clamping block 208 and the second clamping block 210 to the edge of the measurement hole of the flexible package, so that the sealed air connection head is hermetically connected to the measurement hole on the flexible package. It should be explained here that when the present invention detects the flexible package, a measurement hole is first cut out at the corner position of the flexible package with scissors. During the test, the upper sealing connector 212 is hermetically connected to the measurement hole of the flexible package placed in the upper test chamber 2055, or the lower sealing connector 213 is hermetically connected to the measurement hole of the flexible package placed in the lower test chamber 2056. In this way, when negative pressure is generated in the upper test chamber 2055 or the lower test chamber 2056, the air outside the test cylinder 205 will enter the corresponding flexible package through the upper sealing connector 212 or the lower seal, and then the negative pressure air extraction method is used to detect the sealing degree of the flexible package.

[0033] In this embodiment, the sealed air connection head includes a docking plate and a suction pipe 2082. An air vent hole is opened in the center of the docking plate. One end of the suction pipe 2082 is connected to the docking plate and communicated with the air vent hole. The other end of the suction pipe 2082 is used to penetrate into the measurement hole of the flexible package. A sealing sleeve 2083 is provided on the periphery of the suction pipe 2082. A clamping notch 2101 for accommodating the suction pipe 2082 is provided on the first clamping block 208. During measurement, the measurement hole part of the flexible package is placed between the second clamping block 210 and the first clamping block 208, so that the suction pipe 2082 penetrates into the measurement hole of the flexible package. Then, the second clamping block 210 and the first clamping block 208 are moved closer to each other and clamped to the edge of the measurement hole, so that the edge of the measurement hole of the flexible package is hermetically connected to the sealed air connection head, preventing the air inside the flexible package from leaking from the edge of the measurement hole. In order to improve the clamping and sealing effect of the first clamping block 208 and the second clamping block 210 on the edge of the measurement hole, sealing rubber strips 2084 are respectively provided on the mutually clamping sides of the first clamping block 208 and the second clamping block 210.

[0034] In this embodiment, a first air inlet passage 2042 is formed inside the upper cover 204, and a second air inlet passage 2054 is formed inside the intermediate partition 211 and the lifting rod 2051. One end of the first air inlet passage 2042 is docked with the docking plate of the upper sealing connector 212, and the other end is communicated with the outside of the test cylinder 205, so that the air outside the test cylinder 205 enters the flexible package located in the upper test chamber 2055. One end of the second air inlet passage 2054 is docked with the docking plate of the lower sealing connector 213, and the other end is communicated with the outside of the test cylinder 205, so that the air outside the test cylinder 205 enters the flexible package located in the lower test chamber 2056.

[0035] In this embodiment, there are two driving motors 201 and two lead screws 202 respectively. The two lead screws 202 are respectively arranged on the opposite sides of the test cylinder 205. The moving bracket 203 includes a cross beam and two nuts 2031 respectively fixed at both ends of the cross beam. The two nuts 2031 are respectively sleeved on the corresponding lead screws 202. The synchronous rotation of the two lead screws 202 drives the moving bracket 203 to move in the up and down direction. In this embodiment, a connection plate 2032 is fixed in the middle of the cross beam. The connection plate 2032 is located below the cross beam. The upper ends of the two lifting rods 2051 are respectively fixedly connected to the lower side of the connection plate 2032.

[0036] In this embodiment, two lifting rods 2051 are arranged in parallel at intervals. Through holes 2041 for the corresponding lifting rods 2051 to pass through are respectively formed in the upper cover 204 and the lower cover 206. The upper compression springs 2052 and the lower compression springs 2053 are respectively sleeved on each lifting rod 2051. Each lifting rod 2051 includes an upper rod section and a lower rod section coaxially spliced together. A threaded column is provided at the upper end of the lower rod section, and a threaded connection hole matching the threaded column is correspondingly provided at the lower end of the upper rod section. The lower rod section is connected to the upper rod section through the threaded column and the threaded connection hole. A through hole for the threaded column to pass through is formed in the intermediate partition 211. The intermediate partition 211 is clamped and fixed between the upper rod section and the lower rod section.

[0037] When the sealing detection device for seafood packaging of the present invention is working, first, a measurement hole is cut at the corner position of the flexible packaging to be detected. The position of the measurement hole at the corner of the flexible packaging can facilitate the first clamping block 208 and the second clamping block 210 to tightly seal and clamp the edge of the measurement hole, and ensure the sealing and clamping effect between the sealing air connection head and the edge of the measurement hole. Then, the flexible packaging is first connected to one of the upper sealing connecting member 212 and the lower sealing connecting member 213. Here, the flexible packaging is first connected to the lower sealing connecting member 213. Specifically, the measurement hole part of the flexible packaging is placed between the second clamping block 210 and the first clamping block 208 of the lower sealing connecting member 213, so that the straw 2082 of the lower sealing connecting member 213 penetrates into the measurement hole of the flexible packaging. Then, the second clamping block 210 and the first clamping block 208 are moved closer to each other, and the locking bolt 209 is rotated to make the first clamping block 208 and the second clamping block 210 clamp the edge of the measurement hole, and the measurement hole of the flexible packaging is hermetically connected to the sealing air connection head.

[0038] Then, the driving motor 201 is started to make the lifting frame 2050 drive the middle partition 211 to move upward. The lower cover 206 will rise with the lifting frame 2050 and gradually approach the opening at the lower end of the test cylinder 205. When the lower cover 206 contacts the opening at the lower end of the test cylinder 205, the lower cover 206 blocks the lower end of the test cylinder 205, making the lower test chamber 2056 form a sealed space. When the lifting frame 2050 drives the middle partition 211 to continue moving upward, at this time, the lower cover 206 will slide relative to the lifting frame 2050 and compress the lower compression spring 2053. Under the elastic force of the lower compression spring 2053, the lower compression spring 2053 will upwardly support the lower cover 206, making the lower cover 206 tightly fit with the lower end of the test cylinder 205, as Figure 5 shown in the state. At the same time, when the middle partition 211 moves upward, a negative pressure will be generated in the lower test chamber 2056, and the air outside the test cylinder 205 will enter the flexible packaging through the second air inlet channel 2054 and the lower sealing connecting member 213. During the process of the middle partition 211 moving upward, the negative pressure value in the lower test chamber 2056 will reach a stable state. At this time, the pressure sensor 2043 on the lower cover 206 will detect a constant pressure value, making the lifting frame 2050 stop moving. The pressure value detected by the pressure sensor 2043 on the lower cover 206 is the sealing degree value of the flexible packaging in the lower test chamber 2056.

[0039] While performing the airtightness detection on the flexible package in the lower test chamber 2056, a flexible package with a measurement hole cut out is placed into the upper test chamber 2055, and the measurement hole of the flexible package is hermetically connected to the upper sealing connection member 212. After the detection of the flexible package in the lower test chamber 2056 is completed, the lifting frame 2050 drives the middle partition plate 211 to move downward. During the upward movement of the middle partition plate 211, the negative pressure in the lower test chamber 2056 will be released first, and then the lifting frame 2050 drives the lower cover 206 to open downward the opening at the lower end of the test cylinder 205. Then the lifting frame 2050 continues to move downward to make the upper cover 204 block the opening at the upper end of the test cylinder 205, so that the upper test chamber 2055 forms a sealed space. Then the lifting frame 2050 continues to move downward to generate a negative pressure in the upper test chamber 2055. As Figure 6 shown in the state, when the negative pressure value in the upper test chamber 2055 reaches a stable state, the pressure sensor 2043 on the upper cover 204 will detect a constant pressure value, causing the lifting frame 2050 to stop moving. The pressure value detected by the pressure sensor 2043 on the upper cover 204 is the airtightness value of the flexible package in the upper test chamber 2055.

[0040] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A sealing detection device for seafood packaging, including a test cylinder (205) whose axis extends in the vertical direction, characterized in that, It further includes a lifting frame (2050) and a lifting drive mechanism for driving the lifting frame (2050) to lift in the up and down directions. An upper cover (204), an intermediate partition (211), and a lower cover (206) are successively arranged on the lifting frame (2050) from top to bottom. The intermediate partition (211) is fixed on the lifting frame (2050) so as to be able to lift synchronously with the lifting frame (2050). Both the upper and lower ends of the test cylinder (205) are open. The lifting frame (2050) penetrates through both ends of the test cylinder (205). The upper cover (204) is located above the test cylinder (205), the lower cover (206) is located below the test cylinder (205), and the intermediate partition (211) is located inside the test cylinder (205) and is in sealed sliding fit with the inner wall of the test cylinder (205). The intermediate partition (211) divides the interior of the test cylinder (205) into two upper and lower test chambers, namely an upper test chamber (2055) and a lower test chamber (2056). Pressure sensors (2043) are respectively connected to the upper cover (204) and the lower cover (206). When the lifting frame (2050) moves downward, the upper cover (204) seals the upper opening of the test cylinder (205) to perform a sealing detection on the flexible packaging in the upper test chamber (2055). When the lifting frame (2050) moves upward, the upper cover (204) opens the upper opening of the test cylinder (205), and the lower cover (206) seals the lower opening of the test cylinder (205) to perform a sealing detection on the flexible packaging in the lower test chamber (2056).

2. The hermeticity detection device for seafood packaging according to claim 1, wherein: The lifting frame (2050) includes a lifting rod (2051) extending in the up and down directions. The upper cover (204) and the lower cover (206) are both slidably arranged on the lifting rod (2051) in the up and down directions. An upper compression spring (2052) is arranged on the upper side of the upper cover (204). The upper compression spring (2052) is sleeved on the lifting rod (2051), and its two ends are respectively connected to the upper cover (204) and the lifting frame (2050). A lower compression spring (2053) is arranged on the lower side of the lower cover (206). The lower compression spring (2053) is sleeved on the lifting rod (2051), and its two ends are respectively connected to the lower cover (206) and the lifting frame (2050).

3. The sealing detection device for seafood packaging according to claim 2, wherein: A upper sealing connection member (212) is provided on the lower side of the upper cover (204), and a lower sealing connection member (213) is provided on the lower side of the intermediate partition plate (211). Both the upper sealing connection member (212) and the lower sealing connection member (213) include a first clamping block (208) and a second clamping block (210). The first clamping block (208) is fixedly arranged, and a sealed air connection head is provided on the first clamping block (208). One end of the first clamping block (208) is hingedly connected to one end of the second clamping block (210), and a locking structure is provided between the other end of the first clamping block (208) and the other end of the second clamping block (210). The locking structure is used to clamp the edge of the measurement hole of the flexible package by the first clamping block (208) and the second clamping block (210), so that the sealed air connection head is hermetically connected to the measurement hole on the flexible package.

4. The sealing performance detection device for seafood packaging according to claim 3, wherein: The locking structure includes a locking bolt (209) rotatably provided on the second clamping block (210) and a threaded hole (2081) opened on the first clamping block (208). Rotating the locking bolt (209) makes one end of the locking bolt (209) threadedly connected to the threaded hole (2081), and thus the first clamping block (208) and the second clamping block (210) clamp the edge of the measurement hole of the flexible package.

5. The sealing detection device for seafood packaging according to claim 3, characterized in that: The sealed air connection head includes a docking plate and a suction pipe (2082). An air vent hole is opened in the center of the docking plate. One end of the suction pipe (2082) is connected to the docking plate and communicated with the air vent hole. A sealing sleeve (2083) is provided on the periphery of the suction pipe (2082). A clamping notch (2101) for accommodating the suction pipe (2082) is provided on the first clamping block (208). A first air inlet channel (2042) is opened inside the upper cover (204). A second air inlet channel (2054) is opened in the intermediate partition plate (211) and the lifting rod (2051). One end of the first air inlet channel (2042) is docked with the docking plate of the upper sealing connection member (212), and the other end is communicated with the outside of the test cylinder (205), so that the air outside the test cylinder (205) enters the flexible package located in the upper test chamber (2055). One end of the second air inlet channel (2054) is docked with the docking plate of the lower sealing connection member (213), and the other end is communicated with the outside of the test cylinder (205), so that the air outside the test cylinder (205) enters the flexible package located in the lower test chamber (2056).

6. The hermeticity detection device for seafood packaging according to claim 2, wherein: There are two lifting rods (2051) arranged in parallel at intervals. Through holes (2041) for the corresponding lifting rods (2051) to pass through are respectively formed in the upper cover (204) and the lower cover (206). The upper compression springs (2052) and the lower compression springs (2053) are respectively sleeved on each lifting rod (2051). Each lifting rod (2051) includes an upper rod section and a lower rod section spliced coaxially together. A threaded column is provided at the upper end of the lower rod section, and a threaded connection hole for cooperating with the threaded column is correspondingly provided at the lower end of the upper rod section. The lower rod section is connected to the upper rod section through the threaded column and the threaded connection hole. A through hole for the threaded column to pass through is formed in the middle partition plate (211), and the middle partition plate (211) is clamped and fixed between the upper rod section and the lower rod section.

7. The hermeticity detection device for seafood packaging according to claim 6, characterized in that: It further includes a cabinet body (101). A fixing frame (207) is provided at the bottom of the cabinet body (101). Mounting holes (2072) are provided on the fixing frame (207), and the test cylinder (205) is fixed in the mounting holes (2072) of the fixing frame (207).

8. The airtightness detection device for seafood packaging according to claim 7, wherein: A support frame (200) is fixed above the test cylinder (205) inside the cabinet body (101). The lifting drive mechanism includes a drive motor (201) and a lead screw (202) connected to the drive motor (201). The drive motor (201) is installed on the upper side of the support frame (200). The lead screw (202) extends in the up and down direction and is arranged between the support frame (200) and the fixing frame (207). The upper end of the lead screw (202) is connected to the output shaft of the drive motor (201). A rotation hole (2071) is formed at the top of the fixing frame (207), and the lower end of the lead screw (202) is rotatably arranged in the rotation hole (2071). A moving bracket (203) is connected to the lead screw (202). The lifting rod (2051) is connected to the moving bracket (203). When the lead screw (202) rotates, it drives the moving bracket (203) to move in the up and down direction, and further drives the lifting rod (2051) to move up and down.

9. The hermeticity detection device for seafood packaging according to claim 8, characterized in that: There are two drive motors (201) and two lead screws (202) respectively. The two lead screws (202) are respectively arranged on the opposite sides of the test cylinder (205). The moving bracket (203) includes a cross beam and two nuts (2031) respectively fixed at both ends of the cross beam. The two nuts (2031) are respectively sleeved on the corresponding lead screws (202). When the two lead screws (202) rotate synchronously, they drive the moving bracket (203) to move in the up and down direction.

10. The hermeticity detection device for seafood packaging according to claim 9, characterized in that: A connection disk (2032) is fixed in the middle of the cross beam. The connection disk (2032) is located below the cross beam. The upper ends of the two lifting rods (2051) are respectively fixedly connected to the lower side of the connection disk (2032).

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