Packet air leakage detection device and detection method thereof

Abstract

The invention provides a packet air leakage detection device and a detection method thereof.The packet air leakage detection device comprises a rack, a conveying mechanism, a detection mechanism and a rejection mechanism, the conveying mechanism is arranged on the rack, and the detection mechanism and the rejection mechanism are sequentially arranged on the rack in the conveying direction; the detection mechanism comprises an upper clamping jaw assembly and a lower clamping jaw assembly which are used for clamping a to-be-detected product, a torsion assembly which is used for driving the upper clamping jaw assembly and the lower clamping jaw assembly to rotate in opposite directions so as to twist the to-be-detected product to detect whether the to-be-detected product leaks air, and an amplification assembly which is used for amplifying the torsion displacement difference of the to-be-detected product. And the amplifying assembly is connected with the eliminating mechanism so as to control the eliminating mechanism in a linkage manner. The device adopts a full-mechanical structure, and is simple in structure, reliable in action, high in sensitivity and strong in anti-interference capability.

Description

Technical Field

[0001] This invention relates to the field of food packaging testing technology, specifically to a device and method for detecting air leakage in sealed packages. Background Technology

[0002] Existing leak detection devices are mostly based on vacuum chambers or pressure chambers, relying on observation of packaging expansion or instrument readings for judgment. Their sensitivity is limited and they depend on manual observation. Some automated equipment uses precision sensors, which are costly and have strict environmental requirements. There is a lack on the market of a purely mechanical detection device that is simple in structure, reliable in operation, and achieves high-sensitivity detection without complex instruments.

[0003] In view of this, the inventor conducted in-depth research on the aforementioned deficiencies in the prior art, which led to the creation of this case. Summary of the Invention

[0004] The purpose of this invention is to address the above-mentioned shortcomings by providing a sealing leakage detection device that employs a purely mechanical structure, has stable performance, and can effectively eliminate leaking packaged products.

[0005] To achieve the above objectives, the solution of the present invention is: a package leakage detection device, comprising a frame, a conveying mechanism, a detection mechanism, and a rejection mechanism. The conveying mechanism is mounted on the frame, and the detection mechanism and the rejection mechanism are sequentially mounted on the frame along the conveying direction. The detection mechanism includes an upper gripper assembly and a lower gripper assembly for clamping the product to be tested, a torsion assembly for driving the upper gripper assembly and the lower gripper assembly to rotate in opposite directions to torsion the product to be tested to detect whether the product to be tested leaks, and an amplification assembly for amplifying the torsional displacement difference of the product to be tested. The amplification assembly is connected to the rejection mechanism to control the rejection mechanism in a linkage manner.

[0006] Furthermore, in order to transport materials and compress the product to be tested during the transport process so as to accurately detect leaking products later, the conveying mechanism includes a vertically arranged left conveyor belt assembly and a right conveyor belt assembly, and a conveying channel for transporting the product to be tested is formed between the left conveyor belt assembly and the right conveyor belt assembly. The frame is provided with a mounting frame located above the conveying mechanism. The upper gripper assembly is mounted on the mounting frame and is located above the conveying channel. The lower gripper assembly is located below the upper gripper assembly and is located below the conveying channel.

[0007] Furthermore, in order to clamp the product under test, both the upper gripper assembly and the lower gripper assembly include a mounting base, a pneumatic gripper for holding the product under test, and a telescopic cylinder for driving the pneumatic gripper to lift and lower to hold the product under test. The mounting base is mounted on the torsion assembly, the telescopic cylinder is mounted on the mounting base, and the pneumatic gripper is mounted on the telescopic cylinder. The pneumatic gripper has two symmetrically arranged arc-shaped clamping pieces, and the inner side of the arc-shaped clamping pieces is provided with a flexible silicone pad to ensure uniform clamping force and without damaging the product under test.

[0008] Furthermore, in order to drive the upper and lower sides of the product under test to rotate in opposite directions, the torsion assembly includes a drive motor, a motor gear, an upper transmission group, and a lower transmission group. The motor gear is coaxially fixed on the motor shaft of the drive motor. The upper transmission group and the lower transmission group are symmetrically arranged on both sides of the motor gear and are both connected to the motor gear. The upper transmission group and the lower transmission group are respectively connected to the upper gripper assembly and the lower gripper assembly to drive the upper gripper assembly and the lower gripper assembly to rotate in opposite directions.

[0009] Furthermore, in order to drive the upper gripper assembly and the lower gripper assembly to rotate, the upper transmission group and the lower transmission group each include a first gear meshing with the motor gear, a second pulley coaxially and fixedly connected to the first gear, a third pulley drivingly connected to the second pulley, and an output shaft coaxially and fixedly connected to the third pulley. The upper gripper assembly and the lower gripper assembly are respectively mounted on the output shafts of the upper transmission group and the lower transmission group.

[0010] Furthermore, in order to output the relative rotation angle difference between the upper and lower gripper assemblies, the amplification component includes an upper linkage shaft, a lower linkage shaft, and a differential gear set. One end of the upper and lower linkage shafts is provided with a linkage pulley. An output pulley is coaxially fixedly mounted on the output shaft. The output pulley is connected to the linkage pulley via a belt to drive the upper and lower linkage shafts to rotate. The differential gear set is connected between the upper and lower linkage shafts to output the relative rotation angle difference between the upper and lower linkage shafts.

[0011] Furthermore, in order to control the rejection mechanism in a coordinated manner, the differential gear set includes an upper gear coaxially fixedly mounted on the upper linkage shaft, a lower gear coaxially fixedly mounted on the lower linkage shaft, and two differential gears coaxially fixedly connected. The two differential gears are located between the upper gear and the lower gear and mesh with both gears simultaneously. One of the differential gears is provided with a trigger extending outward to trigger the rejection mechanism.

[0012] Furthermore, in order to remove defective products, a guide plate is provided on the frame below the end of the conveying mechanism. The guide plate extends downward at an angle along the conveying direction. A rejection port is provided on the guide plate below the end of the conveying mechanism. A rejection plate is provided on the rejection port. The end of the rejection plate near the conveying mechanism is a fixed end that is hinged to the guide plate, and the end of the rejection plate facing away from the conveying mechanism is a free end that is suspended. The rejection mechanism is located below the rejection plate to support the rejection plate and block the rejection port.

[0013] Furthermore, in order to control the blocking of the rejection port by the rejection plate, the rejection mechanism includes a rejection rod inclined below the rejection plate, the triggering element being a cable, one end of the rejection rod being a rotating end rotatably connected to the guide plate, the rotating end being located on one side of the fixed end of the rejection plate, and a reset spring for resetting the rejection rod being provided between the rotating end and the guide plate, the other end of the rejection rod being connected to one end of the cable, and the other end of the cable being connected to an amplification mechanism, so that the cable is pulled by the amplification mechanism to drive the rejection rod to rotate, thereby removing the support of the rejection rod on the rejection plate and opening the rejection port.

[0014] Another objective of this invention is to address the above-mentioned shortcomings by providing a detection method for a sealing leakage detection device that employs a purely mechanical structure, has stable performance, and can effectively eliminate leaking packaged products.

[0015] Another solution adopted by the present invention to solve the above-mentioned technical problem is: a detection method for a package leakage detection device, comprising the following steps:

[0016] S1: Place the product to be tested vertically between the left and right conveyor belt assemblies. The product is then conveyed by the left and right conveyor belt assemblies to the area below the upper gripper assembly. The upper and lower gripper assemblies clamp the upper and lower sides of the product to be tested, respectively.

[0017] S2: Start the drive motor. The drive motor simultaneously drives the output shafts of the upper and lower transmission groups to rotate in opposite directions, causing the upper and lower gripper assemblies to apply a pair of predetermined torques in opposite directions to the product to be tested and maintain them for a certain period of time.

[0018] S3: The upper and lower linkage shafts, which are connected to the output shafts of the upper and lower transmission groups, rotate synchronously. The upper and lower linkage shafts generate a relative rotation angle difference, which drives the two differential gears to rotate and generate relative torsional displacement.

[0019] S4: If the relative torsional displacement reaches the trigger threshold, the cable pulls the rejection rod completely away from below the rejection plate, and the rejection port opens, then it is judged as a leak; otherwise, it is judged as qualified.

[0020] Compared with the prior art, the present invention has the following advantages: The present invention adopts a fully mechanical structure. During operation, by applying a pair of reverse torques to the upper and lower gripper assemblies, the leaking package, due to insufficient internal pressure, deforms more, resulting in an angular difference between the upper and lower drive shafts. Utilizing the characteristic of abnormal torsional deformation caused by the decrease in rigidity of the leaking package, the amplification mechanism captures and amplifies the relative torsional difference between the upper and lower gripper assemblies, ultimately driving the rejection mechanism to remove the leaking product. The entire device requires no sensors or circuits, has a simple structure, reliable operation, high sensitivity, and strong anti-interference ability. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0022] Figure 1 This is a schematic diagram of the structure of the present invention. Figure 1 ;

[0023] Figure 2 This is a schematic diagram of the structure of the present invention. Figure 2 ;

[0024] Figure 3 This is a front view of the structure of the present invention;

[0025] Figure 4 This is a schematic diagram of the testing organization's structure;

[0026] Figure 5 A schematic diagram of the amplification component.

[0027] Figure 6 This is a schematic diagram of the rejection mechanism.

[0028] In the diagram: Frame 1; Mounting frame 11; Guide plate 12; Rejector plate 13; Conveying mechanism 2; Left conveyor belt assembly 21; Right conveyor belt assembly 22; Detection mechanism 3; Upper gripper assembly 31; Mounting base 311; Pneumatic gripper 312; Telescopic cylinder 313; Lower gripper assembly 32; Torsion assembly 33; Drive motor 331; Motor gear 332; First gear 333; Second pulley 334; Third pulley 335; Output shaft 336; Output pulley 337; Amplification assembly 34; Upper linkage shaft 341; Lower linkage shaft 342; Linkage pulley 343; Upper gear 344; Lower gear 345; Differential gear 346; Rejector mechanism 4; Rejector rod 41; Cable 42. Detailed Implementation

[0029] To further explain the technical solution of the present invention, the present invention will be described in detail below through specific embodiments.

[0030] Example 1: As Figure 1-6As shown, this embodiment provides a package leakage detection device, including a frame 1, a conveying mechanism 2, a detection mechanism 3, and a rejection mechanism 4. The conveying mechanism 2 is mounted on the frame 1, and the detection mechanism 3 and the rejection mechanism 4 are sequentially mounted on the frame 1 along the conveying direction. The detection mechanism 3 includes an upper gripper assembly 31 and a lower gripper assembly 32 for clamping the product to be tested, a torsion assembly 33 for driving the upper gripper assembly 31 and the lower gripper assembly 32 to rotate in opposite directions to torsion the product to be tested to detect whether the product to be tested is leaking, and an amplification assembly 34 for amplifying the torsional displacement difference of the product to be tested. The amplification assembly 34 is connected to the rejection mechanism 4 to control the rejection mechanism 4 in a linkage manner.

[0031] In this embodiment, in order to transport materials and compress the product to be tested during the transport process so as to accurately detect leaking products later, the conveying mechanism 2 includes a vertically arranged left conveyor belt assembly 21 and a right conveyor belt assembly 22. A conveying channel for transporting the product to be tested is formed between the left conveyor belt assembly 21 and the right conveyor belt assembly 22. The frame 1 is provided with a mounting frame 11 located above the conveying mechanism 2. The upper gripper assembly 31 is mounted on the mounting frame 11 and is located above the conveying channel. The lower gripper assembly 32 is located below the upper gripper assembly 31 and is located below the conveying channel.

[0032] In this embodiment, in order to clamp the product to be tested, both the upper gripper assembly 31 and the lower gripper assembly 32 include a mounting base 311, a pneumatic gripper 312 for clamping the product to be tested, and a telescopic cylinder 313 for driving the pneumatic gripper 312 to lift and lower to clamp the product to be tested. The mounting base 311 is mounted on the torsion assembly 33, the telescopic cylinder 313 is mounted on the mounting base 311, and the pneumatic gripper 312 is mounted on the telescopic cylinder 313. Two arc-shaped clamping pieces are symmetrically arranged on the pneumatic gripper 312. The inner side of the arc-shaped clamping pieces is provided with a flexible silicone pad to ensure uniform clamping force and no damage to the product to be tested.

[0033] In this embodiment, in order to drive the upper and lower sides of the product under test to rotate in opposite directions, the torsion assembly 33 includes a drive motor 331, a motor gear 332, an upper transmission group, and a lower transmission group. The motor gear 332 is coaxially fixedly mounted on the motor shaft of the drive motor 331. The upper transmission group and the lower transmission group are symmetrically arranged on both sides of the motor gear 332, and both the upper transmission group and the lower transmission group are connected to the motor gear 332 for transmission. The upper transmission group and the lower transmission group are respectively connected to the upper gripper assembly 31 and the lower gripper assembly 32 to drive the upper gripper assembly 31 and the lower gripper assembly 32 to rotate in opposite directions.

[0034] In this embodiment, in order to drive the upper gripper assembly 31 and the lower gripper assembly 32 to rotate, the upper transmission group and the lower transmission group each include a first gear 333 meshing with the motor gear 332, a second pulley 334 coaxially fixedly connected to the first gear 333, a third pulley 335 drivingly connected to the second pulley 334, and an output shaft 336 coaxially fixedly connected to the third pulley 335. The upper gripper assembly 31 and the lower gripper assembly 32 are respectively mounted on the output shaft 336 of the upper transmission group and the lower transmission group.

[0035] In this embodiment, in order to output the relative rotation angle difference between the upper gripper assembly 31 and the lower gripper assembly 32, the amplification assembly 34 includes an upper linkage shaft 341, a lower linkage shaft 342, and a differential gear set. One end of the upper linkage shaft 341 and the lower linkage shaft 342 is provided with a linkage pulley 343. An output pulley 337 is coaxially fixedly mounted on the output shaft 336. The output pulley 337 is connected to the linkage pulley 343 via a belt to drive the upper linkage shaft 341 and the lower linkage shaft 342 to rotate. The differential gear set is connected between the upper linkage shaft 341 and the lower linkage shaft 342 to output the relative rotation angle difference between the upper linkage shaft 341 and the lower linkage shaft 342.

[0036] In this embodiment, in order to control the rejection mechanism 4 in a coordinated manner, the differential gear set includes an upper gear 344 coaxially fixedly mounted on the upper linkage shaft 341, a lower gear 345 coaxially fixedly mounted on the lower linkage shaft 342, and two differential gears 346 coaxially fixedly connected. The two differential gears 346 are located between the upper gear 344 and the lower gear 345, and the two differential gears 346 mesh with both the upper gear 344 and the lower gear 345 simultaneously. One of the differential gears 346 is provided with a trigger extending outward for triggering the rejection mechanism 4.

[0037] In this embodiment, in order to remove defective products, a guide plate 12 is provided on the frame 1 below the end of the conveying mechanism 2. The guide plate 12 extends downward at an inclination along the conveying direction. A rejection port is provided on the guide plate 12 below the end of the conveying mechanism 2. A rejection plate 13 is provided on the rejection port. The end of the rejection plate 13 near the conveying mechanism 2 is a fixed end that is hinged to the guide plate 12, and the end of the rejection plate 13 facing away from the conveying mechanism 2 is a free end that is suspended. The rejection mechanism 4 is provided below the rejection plate 13 to support the rejection plate 13 and block the rejection port.

[0038] In this embodiment, to control the blocking of the rejection port by the rejection plate 13, the rejection mechanism 4 includes a rejection rod 41 inclined below the rejection plate 13. The length direction of the rejection rod 41 forms a certain angle with the length direction of the guide plate 12. The specific angle is set as needed to ensure that, under air-free conditions, the relative torsional angle between the upper gripper assembly 31 and the lower gripper assembly 32 is insufficient to drive the rejection rod to detach from the rejection plate, and is in a critical position. Once air leakage occurs, the relative torsional angle between the upper gripper assembly 31 and the lower gripper assembly 32 is mapped onto the differential gear 346, and the differential gear 346 rotates at a larger angle. The displacement of the pull cable 42 is sufficient to drive the rejection rod to detach from the rejection plate. The trigger is the pull cable 42. One end of the rejection rod 41 is a rotating end that is rotatably connected to the guide plate 12 or the frame 1. The rotating end is located on the side of the fixed end of the rejection plate 13. A reset spring for resetting the rejection rod is also provided between the rotating end and the guide plate 12. The other end of the rejection rod 41 is connected to one end of the pull cable 42. The other end of the pull cable 42 is connected to the amplification mechanism so that the pull cable 42 is pulled by the amplification mechanism, thereby driving the rejection rod 41 to rotate and remove the support of the rejection rod 41 on the rejection plate 13, thereby opening the rejection port.

[0039] Example 2: A detection method for a package leakage detection device, comprising the following steps:

[0040] S1: Place the product to be tested vertically between the left conveyor belt assembly 21 and the right conveyor belt assembly 22. The product is then conveyed by the left conveyor belt assembly 21 and the right conveyor belt assembly 22 to the area below the upper gripper assembly 31. The upper gripper assembly 31 and the lower gripper assembly 32 clamp the upper and lower sides of the product to be tested, respectively.

[0041] S2: Start the drive motor 331. The drive motor 331 simultaneously drives the output shafts 336 of the upper transmission group and the lower transmission group to rotate in opposite directions, thereby driving the upper gripper assembly 31 and the lower gripper assembly 32 to apply a pair of predetermined torques in opposite directions to the product to be tested and maintain them for a certain period of time.

[0042] S3: The upper linkage shaft 341 and the lower linkage shaft 342, which are connected to the output shaft 336 of the upper and lower transmission groups, rotate synchronously. The upper linkage shaft 341 and the lower linkage shaft 342 generate a relative rotation angle difference, which drives the two differential gears 346 to rotate and generate relative torsional displacement.

[0043] S4: If the relative torsional displacement reaches the trigger threshold, the cable 42 pulls the rejection rod completely away from below the rejection plate 13, and the rejection port opens, then it is judged as a leak; otherwise, it is judged as qualified.

[0044] This invention adopts a fully mechanical structure. During operation, by applying a pair of opposing torques to the upper gripper assembly 31 and the lower gripper assembly 32, the leaking package, due to insufficient internal pressure, deforms more, resulting in an angular difference between the upper and lower drive shafts. Utilizing the characteristic of abnormal torsional deformation caused by the decrease in rigidity of the leaking package, the amplification mechanism 34 captures and amplifies the relative torsional difference between the upper gripper assembly 31 and the lower gripper assembly 32, ultimately driving the rejection mechanism to remove the leaking product. The entire device requires no sensors or circuits, has a simple structure, reliable operation, high sensitivity, and strong anti-interference ability.

[0045] The above embodiments and figures are not intended to limit the product form and style of the present invention. Any appropriate changes or modifications made by those skilled in the art should be considered as not departing from the patent scope of the present invention.

Claims

1. A package leak detection apparatus, comprising: The device includes a frame, a conveying mechanism, a detection mechanism, and a rejection mechanism. The conveying mechanism is mounted on the frame, and the detection mechanism and rejection mechanism are sequentially mounted on the frame along the conveying direction. The detection mechanism includes an upper gripper assembly and a lower gripper assembly for holding the product to be tested, a torsion assembly for driving the upper gripper assembly and the lower gripper assembly to rotate in opposite directions to torsion the product to be tested to detect whether the product to be tested is leaking air, and an amplification assembly for amplifying the torsional displacement difference of the product to be tested. The amplification assembly is connected to the rejection mechanism to control the rejection mechanism in a linkage manner.

2. The package leak detection apparatus of claim 1, wherein: The conveying mechanism includes a vertically arranged left conveyor belt assembly and a right conveyor belt assembly, with a conveying channel for conveying the product to be tested formed between the left and right conveyor belt assemblies. The frame is provided with a mounting frame located above the conveying mechanism. The upper gripper assembly is mounted on the mounting frame and is located above the conveying channel. The lower gripper assembly is located below the upper gripper assembly and is located below the conveying channel.

3. The air leakage detection device for sealed packages according to claim 1, characterized in that: Both the upper gripper assembly and the lower gripper assembly include a mounting base, a pneumatic gripper for holding the product under test, and a telescopic cylinder for driving the pneumatic gripper to lift and lower to hold the product under test. The mounting base is mounted on the torsion assembly, the telescopic cylinder is mounted on the mounting base, and the pneumatic gripper is mounted on the telescopic cylinder. The pneumatic gripper has two symmetrically arranged arc-shaped clamping pieces. The inner side of the arc-shaped clamping pieces is provided with a flexible silicone pad to ensure uniform clamping force and to prevent damage to the product under test.

4. The air leakage detection device for sealed packages according to claim 1, characterized in that: The torsion assembly includes a drive motor, a motor gear, an upper transmission group, and a lower transmission group. The motor gear is coaxially fixed on the motor shaft of the drive motor. The upper transmission group and the lower transmission group are symmetrically arranged on both sides of the motor gear and are both connected to the motor gear. The upper transmission group and the lower transmission group are respectively connected to the upper gripper assembly and the lower gripper assembly to drive the upper gripper assembly and the lower gripper assembly to rotate in opposite directions.

5. The air leakage detection device for sealed packages according to claim 4, characterized in that: Both the upper and lower transmission groups include a first gear meshing with the motor gear, a second pulley coaxially and fixedly connected to the first gear, a third pulley drivingly connected to the second pulley, and an output shaft coaxially and fixedly connected to the third pulley. The upper gripper assembly and the lower gripper assembly are respectively mounted on the output shafts of the upper and lower transmission groups.

6. The air leakage detection device for sealed packages according to claim 5, characterized in that: The amplification component includes an upper linkage shaft, a lower linkage shaft, and a differential gear set. One end of the upper linkage shaft and the lower linkage shaft is provided with a linkage pulley. An output pulley is coaxially fixedly mounted on the output shaft. The output pulley is connected to the linkage pulley via a belt to drive the upper linkage shaft and the lower linkage shaft to rotate. The differential gear set is connected between the upper linkage shaft and the lower linkage shaft to output the relative rotation angle difference between the upper linkage shaft and the lower linkage shaft.

7. The air leakage detection device for sealed packages according to claim 6, characterized in that: The differential gear set includes an upper gear coaxially fixedly mounted on the upper linkage shaft, a lower gear coaxially fixedly mounted on the lower linkage shaft, and two differential gears coaxially fixedly connected. The two differential gears are located between the upper gear and the lower gear and mesh with both gears simultaneously. One of the differential gears is provided with a trigger element that extends outward to trigger the rejection mechanism.

8. The air leakage detection device for sealed packages according to claim 7, characterized in that: A guide plate is provided on the frame below the end of the conveying mechanism. The guide plate extends downward at an inclination along the conveying direction. A rejection port is provided on the guide plate below the end of the conveying mechanism. A rejection plate is provided on the rejection port. The end of the rejection plate near the conveying mechanism is a fixed end that is hinged to the guide plate, and the end of the rejection plate facing away from the conveying mechanism is a free end that is suspended. The rejection mechanism is provided below the rejection plate to support the rejection plate and block the rejection port.

9. The air leakage detection device for sealed packages according to claim 8, characterized in that: The rejection mechanism includes a rejection rod inclined below the rejection plate. The trigger is a cable. One end of the rejection rod is a rotating end that is rotatably connected to the guide plate. The rotating end is located on one side of the fixed end of the rejection plate. A reset spring for resetting the rejection rod is also provided between the rotating end and the guide plate. The other end of the rejection rod is connected to one end of the cable. The other end of the cable is connected to an amplification mechanism so that the amplification mechanism pulls the cable, thereby causing the rejection rod to rotate and remove the support of the rejection rod on the rejection plate, thus opening the rejection port.

10. A detection method for a package leakage detection device as described in any one of claims 1-9, characterized in that: Includes the following steps: S1: Place the product to be tested vertically between the left and right conveyor belt assemblies. The product is then conveyed by the left and right conveyor belt assemblies to the area below the upper gripper assembly. The upper and lower gripper assemblies clamp the upper and lower sides of the product to be tested, respectively. S2: Start the drive motor. The drive motor simultaneously drives the output shafts of the upper and lower transmission groups to rotate in opposite directions, causing the upper and lower gripper assemblies to apply a pair of predetermined torques in opposite directions to the product to be tested and maintain them for a certain period of time. S3: The upper and lower linkage shafts, which are connected to the output shafts of the upper and lower transmission groups, rotate synchronously. The upper and lower linkage shafts generate a relative rotation angle difference, which drives the two differential gears to rotate and generate relative torsional displacement. S4: If the relative torsional displacement reaches the trigger threshold, the cable pulls the rejection rod completely away from below the rejection plate, and the rejection port opens, then it is judged as a leak; otherwise, it is judged as qualified.

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