Liquid food package pressure resistance online detection system

Abstract

The invention relates to a liquid food package pressure resistance online detection system which comprises a product conveyor belt, a manipulator, a detection bag transfer unit and a pressure detection unit, and the product conveyor belt is used for conveying finished product packaging boxes; the detection bag transfer unit comprises a storage box, a bag placing device and a bag opening device from top to bottom, and provides a packaging bag with an open bottom and a closed top for the pressure detection unit; the pressure detection unit comprises a movable clamping part, a hot-pressing sealing part and at least one pair of suction cups which are oppositely arranged, and the mechanical arm is used for extracting finished product packaging boxes on the product conveying belt and putting the finished product packaging boxes into the clamping part; the two suction cups can receive a packaging bag from the bag opener, and the clamping part can move to the position between the two suction cups and lift a finished product packaging box into the packaging bag. The hot-pressing sealing part can move to the position below the packaging bag and is used for sealing an opening of the packaging bag in a hot-pressing mode. The outer side faces of the two suction cups are connected with air pressure adjusting devices respectively, detection pressure is provided, and the pressure resistance of the finished product packaging box is detected.

Description

Technical Field

[0001] The invention belongs to the technical field of liquid food packaging detection, and in particular relates to an online detection system for the pressure resistance of liquid food packaging. Background Art

[0002] In the field of liquid food packaging, after filling and sealing, the pressure resistance of the packaging structure needs to be tested to ensure that the packaging seal is intact and that the liquid will not flow out due to collision and extrusion of conventional strength in the subsequent transportation link. The most important liquid food packaging is the three-dimensional box packaging, such as the Tetra Pak box. The sealing of the three-dimensional box packaging is divided into horizontal sealing and vertical sealing. If the sealing is not good, when extrusion occurs, the interface position of the horizontal seal and the vertical seal will be damaged first. There is also plastic bag packaging, which requires sealing strength testing. The sampling detection method is generally used in the prior art, that is, sampling from a batch of products, and then sending the samples to the laboratory for pressure testing, and finally forming a qualified rate conclusion. Although this method has high accuracy, it has serious hysteresis. Once a problem is detected, the equipment is adjusted, resulting in the adjustment. The products produced before the adjustment may have hidden dangers in sealing, and additional testing is required later. Unqualified products cause a lot of losses and waste to the company. Summary of the invention

[0003] In view of the above problems, the present invention provides an online pressure resistance detection system for liquid food packaging, comprising a product conveyor belt, a manipulator, a detection bag transfer unit and a pressure detection unit, wherein the product conveyor belt is used to transfer the finished product packaging box; the detection bag transfer unit comprises a storage box, a bag placer and a bag opener from top to bottom, and provides a packaging bag with a bottom opening and a top closing for the pressure detection unit;

[0004] The pressure detection unit includes a movable clamping part, a hot-pressing and sealing part, and at least one pair of oppositely arranged suction cups. The robot arm extracts the finished packaging box on the product conveyor belt and places it in the clamping part; the two suction cups can receive the packaging bag from the bag opener, and the clamping part can move between the two suction cups and lift the finished packaging box into the packaging bag; the hot-pressing and sealing part can move to the bottom of the packaging bag to heat-press and seal the opening of the packaging bag; the outer sides of the two suction cups are respectively connected to the air pressure regulating device to provide the detection pressure and detect the pressure resistance of the finished packaging box.

[0005] Optionally, a workbench for online testing is provided next to the product conveyor belt, a manipulator is provided between the product conveyor belt and the workbench, a vertical equipment wall is provided on the workbench, the test bag transfer unit and the first track are installed on the equipment wall, and the bases of the two suction cups are slidably connected to the first track to move the positions of the suction cups;

[0006] Two recycling boxes are arranged under the workbench to respectively recycle qualified and unqualified products after inspection; a second track and a third track are arranged on the workbench, the clamping part is slidably connected to the second track, and the hot pressing sealing part is slidably connected to the third track.

[0007] Optionally, the plurality of packaging bags stored in the storage box are connected end to end in a string, so as to facilitate continuous release under the pulling force of the bag placing device; an outlet is provided at the bottom of the storage box, allowing a single packaging bag to be pulled out;

[0008] The bag placing device comprises two symmetrically arranged rolling wheels, the central axis of which is arranged horizontally, the two rolling wheels rotate in opposite directions, the wheel surfaces of which can contact each other, and when the packaging bag is between the two rolling wheels, the rotation of the rolling wheels generates friction, which can continuously pull the packaging bag downward;

[0009] The bag opener includes two symmetrically arranged rolling wheels 2, the central axis of the rolling wheels 2 is horizontally arranged, the two rolling wheels 2 rotate in opposite directions, the wheel surfaces of the two rolling wheels 2 can contact each other, and one rolling wheel 2 is connected to a driving device 1, so that the rolling wheel 2 can move back and forth in a direction close to or away from the equipment wall. While pulling down the packaging bag between the two rolling wheels 2, the packaging bag can also be rubbed open to facilitate subsequent loading into the finished product packaging box.

[0010] Further optionally, a cutting device is provided between the bag placing device and the bag opener, for cutting off the connection between the packaging bag clamped by the bag opener and the packaging bag above it;

[0011] The cutting device includes an infrared transmitter, an infrared receiver, a support rod 1, a support rod 2, a cutting knife and a driving device 2. The support rod 1 and the support rod 2 are both arranged horizontally and perpendicular to the equipment wall. One end of the support rod 1 is connected to the equipment wall, and the other end is provided with an infrared transmitter; one end of the support rod 2 is connected to the equipment wall, and the other end is provided with an infrared receiver; the positions of the infrared transmitter and the infrared receiver correspond to each other;

[0012] The second driving device is arranged on the equipment wall, and the telescopic end of the second driving device is connected to the cutting knife, so that the cutting knife can move back and forth in the direction of approaching or moving away from the equipment wall to cut the connection of the packaging bag.

[0013] Optionally, the side of the suction cup is connected to the corresponding base through three support rods, the interior of the suction cup is hollow, the sides of the two suction cups facing each other are the inner sides, and the sides opposite to the inner sides of the suction cups are the outer sides. The outer sides of the suction cups are connected to the air pressure regulating device through a pipeline, which can supply or exhaust air to the inside of the suction cup; the inner side of the suction cup is evenly provided with a plurality of hollow parts, so that the internal space of the suction cup is connected to the external space of the suction cup;

[0014] When the air pressure device is adjusted to draw air, the two suction cups can hold the descending packaging bag, making it easier for the finished packaging box to be loaded into the packaging bag; when the air pressure device is adjusted to supply air, the air pressure between the two suction cups squeezes the finished packaging box, enabling pressure testing.

[0015] Further optionally, the hollow part is in a vertical direction, and one hollow part is composed of a plurality of strip-shaped hollows and circular hollows arranged alternately; in two adjacent hollow parts, the strip-shaped hollows and the circular hollows are at the same height, that is, hollows of the same shape are staggered in the horizontal direction.

[0016] Further optionally, the ratio of the diameter of the circular hollow to the maximum transverse length of the corresponding suction cup is (0.03-0.05):1;

[0017] In the same hollow part, the ratio of the width of the strip hollow to the diameter of the circular hollow is (0.6-0.8):1, and the ratio of the longitudinal length of the strip hollow to the diameter of the circular hollow is 1:1.

[0018] Optionally, the first track is a horizontal transverse strip track and is located below the bag opener, so that the two suction cups can move laterally below the bag opener, that is, move towards or away from each other, to achieve the action of clamping the finished product packaging box.

[0019] Optionally, the clamping part includes a clamping seat and an air pipe, the clamping seat is slidably connected to the second track on the workbench surface through four retractable support rods, the bottom of the air pipe is connected to the clamping seat, and the top of the air pipe is vertically upward; the interior of the air pipe is hollow, and a vacuum pump and an air supply pump are connected in parallel through the air pipe, so that the air inside the packaging bag to be tested can be evacuated to prepare for pressure testing, and the air can also be output upward to lift the packaging bag.

[0020] Optionally, the second track is perpendicular to the equipment wall and corresponds to the position of the bag opener, so that the clamping seat can be close to or far away from the bottom of the bag opener.

[0021] Optionally, a heat press is provided on the top of the heat pressing and sealing part for heat pressing and sealing the bottom of the packaging bag; the third track is parallel to the second track, and the third track is located between the second track and the equipment wall, so that the heat pressing and sealing part can move back and forth under the packaging bag containing the finished packaging box. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the online detection system for pressure resistance of liquid food packaging;

[0023] Figure 2 for Figure 1 A top view schematic diagram of

[0024] Figure 3 for Figure 1A side view schematic diagram of

[0025] Figure 4 for Figure 1 a side view schematically showing the other side of the

[0026] Figure 5 It is a schematic diagram of the cooperation between the bag placer, bag opener and suction cup to stretch, cut and suck the packaging bag.

[0027] In the attached drawings, 1-product conveyor belt, 2-manipulator, 3-finished product packaging box, 4-storage box, 5-support rod four, 6-clamping part, 7-hot pressing and sealing part, 8-suction cup, 9-rolling wheel one, 10-rolling wheel two, 11-workbench, 12-equipment wall, 13-first track, 14-second track, 15-third track, 16-recycling box, 17-infrared transmitter, 18-infrared receiver, 19-support rod one, 20-support rod two, 21-cutting knife, 22-packaging bag, 23-support rod three, 24-hollow part, 25-strip hollow, 26-circular hollow, 27-clamping seat, 28-gas pipe. DETAILED DESCRIPTION

[0028] This embodiment provides an online detection system for the pressure resistance of liquid food packaging. Figure 1-Figure 5 As shown, it includes a product conveyor belt 1, a manipulator 2, a detection bag transfer unit and a pressure detection unit. The product conveyor belt 1 is used to transfer the finished product packaging box 3; the detection bag transfer unit includes a storage box 4, a bag placer and a bag opener from top to bottom, and provides a packaging bag 22 with a bottom opening and a top closed for the pressure detection unit;

[0029] The pressure detection unit includes a movable clamping part 6, a hot-pressing sealing part 7 and at least one pair of oppositely arranged suction cups 8. The robot 2 picks up the finished packaging box on the product conveyor belt 1 and puts it into the clamping part 6; the two suction cups 8 can receive the packaging bag from the bag opener, and the clamping part 6 can move between the two suction cups 8 and lift the finished packaging box into the packaging bag; the hot-pressing sealing part 7 can move to the bottom of the packaging bag to heat-press and seal the opening of the packaging bag; the outer sides of the two suction cups 8 are respectively connected to the air pressure regulating device to provide detection pressure and detect the pressure resistance of the finished packaging box.

[0030] Compared with the traditional workshop sampling and laboratory testing, the present invention sets the pressure detection unit near the product conveyor belt 1, integrates the online detection system into the production process, and realizes online detection. The detection principle is: put the finished product packaging box into the packaging bag, and then seal the packaging bag to prevent the liquid inside from splashing out after the packaging box is crushed during pressure testing; then apply a preset pressure to the packaging bag, and the products that are crushed are unqualified products, and those that are not crushed are qualified products. The products after testing are discarded (cannot be sold out of the factory). When unqualified products are detected, the product conveyor belt 1 stops, and the equipment is adjusted and debugged immediately to quickly correct the sealing problem of the packaging box from the source.

[0031] Optionally, a workbench 11 for online detection is provided next to the product conveyor belt 1, a manipulator 2 is provided between the product conveyor belt 1 and the workbench 11, a vertical equipment wall 12 is provided on the workbench 11, the detection bag transfer unit and the first track 13 are installed on the equipment wall 12, and the bases of the two suction cups 8 are slidably connected to the first track 13, so as to be able to move the position of the suction cups 8;

[0032] Two recycling boxes 16 are provided under the workbench 11 to respectively recycle qualified and unqualified products after inspection; a second track 14 and a third track 15 are provided on the workbench 11, the clamping part 6 is slidably connected to the second track 14, and the hot pressing sealing part 7 is slidably connected to the third track 15.

[0033] Optionally, the plurality of packaging bags stored in the storage box 4 are connected end to end in a string, so as to facilitate continuous release under the pulling force of the bag placing device; an outlet is provided at the bottom of the storage box 4, allowing a single packaging bag to be pulled out;

[0034] The bag placing device comprises two symmetrically arranged rolling wheels 9, the central axis of the rolling wheels 9 is arranged horizontally, the two rolling wheels 9 rotate in opposite directions, the wheel surfaces of the two rolling wheels 9 can contact each other, and when the packaging bag is between the two rolling wheels 9, the rotation of the rolling wheels 9 generates friction, which can continuously pull the packaging bag downward;

[0035] The bag opener includes two symmetrically arranged rolling wheels 10, the central axes of which are arranged horizontally, the two rolling wheels 10 rotate in opposite directions, the wheel surfaces of the two rolling wheels 10 can contact each other, and one rolling wheel 10 is connected to a driving device 1, so that the rolling wheel 10 can move back and forth in a direction close to or away from a device wall 12, and while pulling down the packaging bag between the two rolling wheels 10, the packaging bag can also be rubbed open to facilitate subsequent loading into a finished product packaging box.

[0036] Further optionally, the top of the storage box 4 is provided with an openable top cover, which is convenient for loading the packaging bags from the top; the outlet at the bottom of the storage box 4 is in a long and thin strip shape, which is convenient for controlling the number of packaging bags pulled out; the material of the storage box 4 is preferably a transparent material, which is convenient for real-time observation of the inventory of packaging bags inside the storage box 4 for timely replenishment. The side of the storage box 4 is hung on the equipment wall 12.

[0037] Further optionally, the central axis of the rolling wheel 9 is connected to the corresponding motor on the equipment wall 12 to drive the rolling wheel 9 to rotate; the rolling wheel 9 on the right rotates counterclockwise, and the rolling wheel 9 on the left rotates clockwise, thereby pulling the packaging bag between the two rolling wheels 9 downward.

[0038] Further optionally, the central axis of one rolling wheel 10 is connected to a corresponding motor on the equipment wall 12; the central axis of the other rolling wheel 10 is connected to a corresponding motor, and the motor is connected to the telescopic end of the driving device 1, and the driving device 1 is arranged on the equipment wall 12, so that the rolling wheel 10 can move horizontally toward the equipment wall 12 while rotating, so as to rub open the packaging bag between the two rolling wheels 10;

[0039] The second rolling wheel 10 on the right side rotates counterclockwise, and the second rolling wheel 10 on the left side rotates clockwise, thereby pulling the packaging bag between the two second rolling wheels 10 downward.

[0040] The horizontally movable rolling wheel 10 has a very small horizontal movement distance, for example, within the range of 1-5 cm, in order to form a horizontal friction force to rub the packaging bag open, so the telescopic end of the driving device 1 is not subjected to much pressure, and a support rod can also be provided to support the telescopic end, so that the telescopic end, the motor, and the rolling wheel 10 remain horizontal. The slender strip opening of the storage box 4 and the packaging bag placed below are both perpendicular to the equipment wall 12.

[0041] Further optionally, a cutting device is provided between the bag placing device and the bag opener, for cutting off the connection between the packaging bag clamped by the bag opener and the packaging bag above it;

[0042] The cutting device includes an infrared transmitter 17, an infrared receiver 18, a support rod 19, a support rod 20, a cutting knife 21 and a driving device 2. The support rod 19 and the support rod 20 are both arranged horizontally and perpendicular to the equipment wall 12. One end of the support rod 19 is connected to the equipment wall 12, and the other end is provided with an infrared transmitter; one end of the support rod 20 is connected to the equipment wall 12, and the other end is provided with an infrared receiver; the positions of the infrared transmitter and the infrared receiver correspond to each other;

[0043] The second driving device is arranged on the equipment wall 12, and the telescopic end of the second driving device is connected to the cutting knife 21, so that the cutting knife 21 can move back and forth in the direction close to or away from the equipment wall 12 to cut the connection of the packaging bag.

[0044] Further optionally, the handle of the cutting knife 21 is connected to the telescopic end of the driving device 2, the knife body is parallel to the equipment wall 12, the tip of the knife points to the support rod 19 or the support rod 20, the blade surface of the cutting knife 21 is horizontal, and the blade surface is sharpened on both sides, so that when the cutting knife 21 moves telescopically, it can cut the connection of the packaging bag.

[0045] Further optionally, the cutting knife 21 is at the same horizontal height as the infrared transmitter and the infrared receiver. When the connection of the packaging bag passes through this horizontal height, the infrared receiver detects the change of the received infrared rays, and the control device starts the driving device 2 to drive the cutting knife 21 to move and cut the connection of the packaging bag.

[0046] The connection form of several packaging bags is similar to the connection form of current rolled garbage bags. The connection between two adjacent packaging bags is linear, with holes at equal intervals. When the cutting knife 21 cuts the connection, the bottom of the upper packaging bag is open, and the top of the lower packaging bag is sealed, and the sealed part is lower than the connection.

[0047] When in use, manually pull out the first packaging bag at the bottom, so that the first packaging bag passes through the bag placer and the bag opener, and then start the rolling wheel 1 9 and the rolling wheel 2 10 to start pulling the packaging bag downward. When the bottom of a packaging bag just reaches between the two rolling wheels 2 10, one of the rolling wheels 2 10 starts to move horizontally while rotating, rubbing horizontally to rub the packaging bag open; the packaging bag continues to move downward and continues to be rubbed open. Since the packaging bag moves downward by the pulling force of the two sets of rolling wheels, the packaging bag between the bag placer and the bag opener will be fully unfolded due to tension, which is convenient for infrared detection. The infrared light is blocked when it hits the packaging bag, and the infrared signal received by the infrared receiver is not strong or cannot receive the infrared signal.

[0048] When the connection at the top of the packaging bag passes the height equivalent to that of the infrared transmitter, part of the infrared rays pass through the through hole at the connection and are received by the infrared receiver. The control device receives this change and drives the cutting knife 21 to move and cut off the connection. The packaging bag below continues to be transported downward and rubbed open by the rolling wheel 2 10, ready to enter between the two suction cups 8. The packaging bag above continues to move downward under the action of the rolling wheel 1 9. Then, the packaging bag below can be attracted by the two suction cups 8 and completely separated from the bag releaser. The packaging bag above enters downward between the two rolling wheels 2 10, continues to move downward, and is rubbed open at the same time. The above operation is repeated to continuously transport the packaging bag to the pressure detection unit.

[0049] Optionally, the side of the suction cup 8 is connected to the corresponding base through a support rod 3 23, the interior of the suction cup 8 is hollow, the sides of the two suction cups 8 facing each other are the inner sides, and the sides opposite to the inner sides of the suction cups 8 are the outer sides. The outer sides of the suction cups 8 are connected to the air pressure regulating device through a pipeline, which can supply or exhaust air to the inside of the suction cups 8; the inner sides of the suction cups 8 are evenly provided with a plurality of hollow parts 24, so that the internal space of the suction cups 8 is connected to the external space of the suction cups 8;

[0050] When the air pressure device is adjusted to draw air, the two suction cups 8 can suck the descending packaging bag, making it easier for the finished packaging box to be loaded into the packaging bag; when the air pressure device is adjusted to supply air, the air pressure between the two suction cups 8 squeezes the finished packaging box, enabling pressure testing.

[0051] Further optionally, the inner side and outer side of the suction cup 8 are perpendicular to the equipment wall 12, the suction cup 8 is a flat cube, round cake or oval, and the area of ​​the inner side of the suction cup 8 is not less than the maximum flat area of ​​the packaging bag, so as to facilitate the suction of the packaging bag. The maximum flat area of ​​the packaging bag is larger than the area of ​​the maximum side of the finished packaging box.

[0052] Further optionally, the air pressure regulating device is arranged under the workbench 11, and includes a gas cylinder, an air supply pump and a vacuum pump. The gas cylinder is connected to the suction cup 8 through an air pipe and the air supply pump to supply air to the suction cup 8; the vacuum pump is connected to the suction cup 8 through an air pipe to exhaust air from the suction cup 8; the air circuit of the vacuum pump and the air supply pump are connected in parallel with the suction cup 8, and air valves are respectively provided to facilitate the separate control of air supply and air extraction.

[0053] Further optionally, the hollow portion 24 is vertical, and one hollow portion 24 is composed of a plurality of strip-shaped hollow portions 25 and circular hollow portions 26 arranged alternately; in two adjacent hollow portions 24, the strip-shaped hollow portions 25 and the circular hollow portions 26 are at the same height, that is, hollow portions of the same shape are staggered in the horizontal direction.

[0054] Further optionally, the ratio of the diameter of the circular hollow to the maximum transverse length of the corresponding suction cup is (0.03-0.05):1;

[0055] In the same hollow portion 24, the ratio of the width of the strip hollow to the diameter of the circular hollow is (0.6-0.8):1, and the ratio of the longitudinal length of the strip hollow to the diameter of the circular hollow is 1:1.

[0056] Preferably, all hollow portions 24 of the two suction cups 8 have the same size, so as to provide a more uniform air passage, uniform suction and pressure for the packaging bag and the finished packaging box.

[0057] Optionally, the first track 13 is a horizontal transverse strip track and is located below the bag opener, so that the two suction cups 8 can move laterally below the bag opener, that is, move towards or away from each other, to achieve the action of clamping the finished product packaging box.

[0058] Further optionally, both ends of the first track 13 extend laterally along the length direction of the equipment wall 12, away from the detection bag transfer unit, so that after a pair of suction cups 8 clamp the finished product packaging box, they can leave the detection bag transfer unit and go to other positions for pressure testing. The suction cups 8 of other pressure testing units can move along the first track 13 to the bottom of the bag opener to receive the packaging bags and finished product packaging boxes, thereby realizing continuous testing and improving testing efficiency.

[0059] As a specific implementation manner, the first track 13 is centered on the detection bag transfer unit, and tracks are respectively provided on both sides of the detection bag transfer unit. A pair of suction cups 8 moves back and forth on the right part of the first track 13, and another pair of suction cups 8 moves back and forth on the left part of the first track 13 without affecting each other; two recycling boxes are provided on the right part below the workbench 11 to respectively recycle qualified and unqualified products after inspection; two recycling boxes are also provided on the left part below the workbench 11 to respectively recycle qualified and unqualified products after inspection; they serve the two pairs of suction cups 8 respectively.

[0060] Optionally, the clamping portion 6 includes a clamping seat 27 and an air pipe 28. The clamping seat 27 is slidably connected to the second track 14 on the surface of the workbench 11 through a retractable support rod 5. The bottom of the air pipe 28 is connected to the clamping seat 27, and the top of the air pipe 28 is vertically upward. The interior of the air pipe 28 is hollow, and a vacuum pump and an air supply pump are connected in parallel through the air pipe. The air inside the packaging bag to be tested can be evacuated to prepare for pressure testing, and the air can also be output upward to lift the packaging bag.

[0061] Further optionally, the center of the clamping seat 27 has a downwardly recessed positioning groove, and the finished product packaging box can be placed in the positioning groove, so that when the clamping seat 27 moves, the finished product packaging box is prevented from shaking or tipping over.

[0062] Further optionally, the air pipe 28 is arranged at the edge of the positioning groove, which does not affect the placement of the finished product packaging box and can contact the side of the finished product packaging box to play an auxiliary fixing role, so that the finished product packaging box in motion is more stable, and the air pipe 28 is together with the finished product packaging box, and the air pipe 28 enters the packaging bag together with the finished product packaging box, and the air pipe 28 occupies as little space in the packaging bag as possible, so as to facilitate the evacuation of the air in the packaging bag as much as possible, which is beneficial to the subsequent pressure detection.

[0063] Optionally, the second track 14 is perpendicular to the equipment wall 12 and corresponds to the position of the bag opener, so that the clamping seat 27 can be close to or far away from the bottom of the bag opener.

[0064] When in use, the robot 2 picks up a finished product packaging box from the product conveyor belt 1 and places it in the positioning groove of the clamping seat 27. At this time, the clamping part 6 is at the end of the second track 14 away from the bag opener. After receiving the finished product packaging box, the clamping part 6 moves along the second track 14 to the bottom of the bag opener. At this time, the clamping part 6 faces a pair of suction cups 8 directly above.

[0065] The rolling wheel 2 10 of the bag opener transports a packaging bag downward. The bottom of the packaging bag is open and the top is sealed. The packaging bag is rubbed open by the rolling wheel 2 10 and is in an open state with a bottom opening. When the packaging bag passes the top between the two suction cups 8, the distance between the two suction cups 8 becomes smaller, but does not contact the packaging bag. The two suction cups 8 then simultaneously draw air to attract the two sides of the bottom of the packaging bag. At this time, the top of the packaging bag is still pulled by the rolling wheel 2 10, and the bottom is opened by the two suction cups 8, realizing the initial opening of the packaging bag. The packaging bag continues to descend, and the two suction cups 8 stop drawing air and do not attract the packaging bag. At the same time, the two suction cups 8 move away from each other to reserve space for the finished packaging box. After the packaging bag is separated from the rolling wheel 2 10, it falls naturally. At this time, the air supply pipe 28 is directly below the packaging bag. When the packaging bag falls between the two suction cups 8 (an infrared transmitter and an infrared receiver may be provided on the top of the two suction cups 8, respectively, to detect the position where the packaging bag falls), the air pipe 28 supplies air upward, and the airflow enters the packaging bag from the bottom opening of the packaging bag, which plays the role of lifting the packaging bag downward and temporarily preventing the packaging bag from falling. At this time, the two suction cups 8 simultaneously draw air and suck the two sides of the packaging bag again, waiting for the finished packaging box, and the air pipe 28 stops supplying air.

[0066] The support rod 24 5 is extended to put the finished packaging box into the packaging bag, and the two suction cups 8 approach each other along the first track 13 to clamp the two sides of the finished packaging box, and the air pipe 28 is located on the side of the finished packaging box that is not clamped. The support rod 24 5 is shortened, and the clamping part 6 moves downward while the air pipe 28 is evacuated until the top of the air pipe 28 drops to the bottom of the packaging bag, and the air in the packaging bag is evacuated using a vacuum pump, waiting for heat-pressing sealing.

[0067] Optionally, a heat press is provided at the top of the heat pressing and sealing part 7 for heat pressing and sealing the bottom of the packaging bag; the third track 15 is parallel to the second track 14, and the third track 15 is located between the second track 14 and the equipment wall 12, so that the heat pressing and sealing part 7 can move back and forth under the packaging bag containing the finished packaging box.

[0068] The third track 15 can be connected with the second track 14, that is, the third track 15 and the second track 14 are in the same straight line. The heat press moves along the third track 15, starts hot pressing from one end of the bottom of the packaging bag, and moves while hot pressing. At the same time, the air pipe 28 moves away from the suction cup 8 with the clamping part 6 without hindering the heat press. Finally, the support rod 24 5 contracts, so that the air pipe 28 moves downward while moving away from the suction cup 8, thereby detaching from the packaging bag, moving away from the second track 14 and preparing to receive the next finished product packaging box. The heat press finally completely passes through the bottom opening of the packaging bag and completes the sealing. At this time, the two suction cups 8 clamp the finished product packaging box with the packaging bag, and the inside of the packaging bag has been evacuated to a vacuum, which does not affect the pressure detection.

[0069] The two suction cups 8 move away from the bag maker along the first track 13, and the hot-pressing sealing part 7 is reset. The two suction cups 8 wait for the temperature at the bottom of the packaging bag to drop (or cool down by blowing air). Then the pressure detection starts, and the two suction cups 8 start to supply air, forming air pressure toward each other, and both sides of the finished packaging box are under pressure. If it is an unqualified product, the finished packaging box is crushed, and the liquid enters the packaging bag. The pressure between the two suction cups 8 decreases instantly and can be detected by the pressure gauge. The finished packaging box and the packaging bag fall into the recycling box for unqualified products through the opening on the workbench 11. If it is a qualified product, the finished packaging box is not crushed, and the pressure between the two suction cups 8 remains unchanged and can be detected by the pressure gauge. The two suction cups 8 clamp the finished packaging box and move it to the top of the recycling box for qualified products, and then the deformed finished packaging box and packaging bag are discarded.

[0070] Preferably, a windshield is provided on the bag placer, bag opener and the top of the suction cup 8 to prevent the falling of the packaging bag from being affected by external airflow and to enable it to fall smoothly. The bottom of the windshield does not affect the movement of the suction cup 8, and the infrared transmitter and infrared receiver of the cutting device can be arranged inside the windshield.

[0071] Example 1

[0072] The present embodiment provides an online detection system for the pressure resistance of liquid food packaging, which has all the above-mentioned technical features, and is characterized in that the suction cup is a flat rectangular parallelepiped and is placed vertically; the diameter of the circular hollow is 2.5 cm, and the ratio of the diameter of the circular hollow to the maximum lateral length of the corresponding suction cup is 0.03:1; in the same hollow part, the ratio of the width of the strip hollow to the diameter of the circular hollow is 0.6:1, and the ratio of the longitudinal length of the strip hollow to the diameter of the circular hollow is 1:1.

[0073] Example 2

[0074] This embodiment provides an online detection system for the pressure resistance of liquid food packaging, which is the same as Embodiment 1, except that the ratio of the diameter of the circular hollow to the maximum transverse length of the corresponding suction cup is 0.05:1.

[0075] Example 3

[0076] This embodiment provides an online detection system for the pressure resistance of liquid food packaging, which is the same as Embodiment 1, except that the ratio of the diameter of the circular hollow to the maximum transverse length of the corresponding suction cup is 0.02:1.

[0077] Example 4

[0078] This embodiment provides an online detection system for the pressure resistance of liquid food packaging, which is the same as Embodiment 1, except that the ratio of the width of the strip hollowing to the diameter of the circular hollowing is 0.8:1.

[0079] Example 5

[0080] This embodiment provides an online detection system for the pressure resistance of liquid food packaging, which is the same as Embodiment 1, except that the ratio of the width of the strip hollowing to the diameter of the circular hollowing is 0.5:1.

[0081] Example 6

[0082] This embodiment provides an online detection system for the pressure resistance of liquid food packaging, which is the same as the first embodiment, except that the inner side of the suction cup is evenly covered with through holes, and the diameter of the through holes is 2 mm.

[0083] In the laboratory, standard pressure tests are performed on sampled finished packaging boxes. Mechanical pressure is applied simultaneously to two opposite pressure-bearing sides of the finished packaging boxes, that is, the finished packaging boxes are squeezed with a flat pressing plate at a predetermined test pressure to obtain the qualified rate of a batch of products.

[0084] The same batch of products were pressure tested using the systems of Examples 1-6. Since the suction cups of the examples are hollow, there is a difference between the air supply pressure effect of the suction cups and the mechanical pressure effect of the flat platen. The two testing methods were experimentally compared. When other testing conditions and product conditions are the same, in order to obtain the same product qualification rate as the mechanical testing by the suction cup test, the suction cup test pressure must be greater than the test pressure of the flat platen. Suction cups with hollow parts of different sizes have different test pressures. After adding and averaging the test pressures of suction cups of various sizes, the average test pressure of the suction cups is 1.35 times the test pressure of the flat platen. Examples 1-5 use this average test pressure for pressure testing, and the obtained product qualification rates are shown in Table 1.

[0085]

[0086] In the above formula, A 标 is the product qualification rate obtained by standard pressure test, %; A is the product qualification rate obtained by Examples 1-5, %.

[0087] Table 1 Comparison of deviation rates between Examples 1-5 and standard tests

[0088] project Product qualification rate (%) Deviation rate (%) Standard testing 96.0 - Example 1 96.9 0.94 Example 2 95.8 0.21 Example 3 99.0 3.13 Example 4 97.3 1.35 Example 5 98.5 2.60

[0089] The traditional pressure detection technology is to use a flat plate to mechanically press the test surface of the packaging box, or to use air pressure to mechanically press the test surface of the packaging box so that the test surface is evenly pressurized.

[0090] Mechanical squeezing of flat sheet materials is not suitable for the system of the present invention, because the suction cup of the present invention can also perform a vacuum operation to attract two opposite sides of the packaging bag, so that the bottom opening of the packaging bag is open and the finished packaging box can easily enter the packaging bag.

[0091] Uniform and complete air pressure detection is also not suitable for the system of the present invention. If the inner side of the suction cup has a complete air pressure outlet, it is not conducive to the suction cup clamping the finished packaging box, and when the packaging bag is sucked, it is easy to suck the packaging bag into the suction cup in whole or in part, making it difficult to control the position of the packaging bag.

[0092] A person skilled in the art may think of the suction cup form of Example 6, but after experiments, it is found that the inner side of the suction cup is evenly covered with through holes, so that when pressure is applied, the air pressure on the position point of the packaging box is very small, resulting in a larger pressure at each through hole, forming a needle-like pressure form on the packaging box, making the packaging box easily penetrated, and cannot reflect the pressure condition of the packaging box in most application scenarios, resulting in the detection result being easily distorted.

[0093] The strip-shaped hollows and circular hollows of the suction cup of the present invention are arranged alternately, and the hollow parts are also arranged evenly. Although the pressure is not absolutely uniform, it is smaller than the pressure of the dense through-hole type, closer to the actual application scenario of the packaging box, and can attract the packaging bag more evenly to prevent the packaging bag from being sucked into the suction cup. The state of the packaging bag on the suction cup is also more uniform. The inventor unexpectedly found that the alternating arrangement of strip-shaped hollows and circular hollows can form a more uniform pressure on the packaging box on the basis of expanding the pressure area. It may be that the edges of the strip-shaped hollows and circular hollows may have a certain uniform effect on the force in all directions when applying force. The specific force application and force conditions need further study.

Claims

1. An online detection system for pressure resistance of liquid food packaging, characterized in that: It includes a product conveyor belt, a manipulator, a test bag transfer unit and a pressure detection unit. The product conveyor belt is used to transfer the finished product packaging box. The test bag transfer unit includes a storage box, a bag placer and a bag opener from top to bottom, and provides a bottom-opening and top-closed packaging bag for the pressure detection unit. The pressure detection unit includes a movable clamping part, a hot-pressing and sealing part, and at least one pair of oppositely arranged suction cups. The robot arm extracts the finished packaging box on the product conveyor belt and places it in the clamping part; the two suction cups can receive the packaging bag from the bag opener, and the clamping part can move between the two suction cups and lift the finished packaging box into the packaging bag; the hot-pressing and sealing part can move to the bottom of the packaging bag to heat-press and seal the opening of the packaging bag; the outer sides of the two suction cups are respectively connected to the air pressure regulating device to provide the detection pressure and detect the pressure resistance of the finished packaging box.

2. The on-line detection system for pressure resistance of liquid food packaging according to claim 1 is characterized in that: A workbench for online testing is provided next to the product conveyor belt, a manipulator is provided between the product conveyor belt and the workbench, a vertical equipment wall is provided on the workbench, the test bag transfer unit and the first track are installed on the equipment wall, and the bases of the two suction cups are slidably connected to the first track to move the positions of the suction cups; Two recycling boxes are arranged under the workbench to respectively recycle qualified and unqualified products after inspection; a second track and a third track are arranged on the workbench, the clamping part is slidably connected to the second track, and the hot pressing sealing part is slidably connected to the third track.

3. The on-line detection system for pressure resistance of liquid food packaging according to claim 2 is characterized in that: The plurality of packaging bags stored in the storage box are connected end to end in a string, and an outlet is provided at the bottom of the storage box to allow a single packaging bag to be pulled out; The bag placing device comprises two symmetrically arranged rolling wheels, the central axis of which is arranged horizontally, the two rolling wheels rotate in opposite directions, the wheel surfaces of which can contact each other, and when the packaging bag is between the two rolling wheels, the rolling wheel can continuously pull the packaging bag downward; The bag opener includes two symmetrically arranged rolling wheels 2, the central axis of the rolling wheels 2 is horizontally arranged, the two rolling wheels 2 rotate in opposite directions, the wheel surfaces of the two rolling wheels 2 can contact each other, and one rolling wheel 2 is connected to a driving device 1, so that the rolling wheel 2 can move back and forth in a direction close to or away from the equipment wall. While pulling down the packaging bag between the two rolling wheels 2, the packaging bag can also be rubbed open to facilitate subsequent loading into the finished product packaging box.

4. The on-line detection system for pressure resistance of liquid food packaging according to claim 3 is characterized in that: A cutting device is provided between the bag placing device and the bag opener, for cutting off the connection between the packaging bag clamped by the bag opener and the packaging bag above it; The cutting device includes an infrared transmitter, an infrared receiver, a support rod 1, a support rod 2, a cutting knife and a driving device 2. The support rod 1 and the support rod 2 are both arranged horizontally and perpendicular to the equipment wall. One end of the support rod 1 is connected to the equipment wall, and the other end is provided with an infrared transmitter; one end of the support rod 2 is connected to the equipment wall, and the other end is provided with an infrared receiver; the positions of the infrared transmitter and the infrared receiver correspond to each other; The second driving device is arranged on the equipment wall, and the telescopic end of the second driving device is connected to the cutting knife, so that the cutting knife can move back and forth in the direction close to or away from the equipment wall to cut the connection of the packaging bag.

5. The on-line detection system for pressure resistance of liquid food packaging according to claim 2, characterized in that: The side of the suction cup is connected to the corresponding base through three support rods, the interior of the suction cup is hollow, the sides of the two suction cups facing each other are the inner sides, and the sides opposite to the inner sides of the suction cups are the outer sides. The outer sides of the suction cups are connected to the air pressure regulating device through a pipeline, which can supply or exhaust air to the inside of the suction cup; the inner side of the suction cup is evenly provided with a plurality of hollow parts, so that the internal space of the suction cup is connected to the external space of the suction cup; When the air pressure device is adjusted to draw air, the two suction cups can hold the descending packaging bag, making it easier for the finished packaging box to be loaded into the packaging bag; when the air pressure device is adjusted to supply air, the air pressure between the two suction cups squeezes the finished packaging box, enabling pressure testing.

6. The on-line detection system for pressure resistance of liquid food packaging according to claim 5 is characterized in that: The hollowed-out parts are vertical, and one hollowed-out part is composed of a plurality of strip-shaped hollows and circular hollows arranged alternately; in two adjacent hollowed-out parts, the strip-shaped hollows and the circular hollows are at the same height, and hollows of the same shape are staggered in the horizontal direction.

7. The on-line detection system for pressure resistance of liquid food packaging according to claim 6, characterized in that: The ratio of the diameter of the circular hollow to the maximum transverse length of the corresponding suction cup is (0.03-0.05):1; In the same hollow part, the ratio of the width of the strip hollow to the diameter of the circular hollow is (0.6-0.8):1, and the ratio of the longitudinal length of the strip hollow to the diameter of the circular hollow is 1:

1.

8. The on-line detection system for pressure resistance of liquid food packaging according to claim 2, characterized in that: The first track is a horizontal transverse strip track and is located below the bag opener, so that the two suction cups can move laterally below the bag opener.

9. The on-line detection system for pressure resistance of liquid food packaging according to claim 2, characterized in that: The clamping part includes a clamping seat and an air pipe. The clamping seat is slidably connected to the second track on the workbench surface through four retractable support rods. The bottom of the air pipe is connected to the clamping seat, and the top of the air pipe is vertically upward. The interior of the air pipe is hollow, and a vacuum pump and an air supply pump are connected in parallel through the air pipe. The air inside the packaging bag to be tested can be evacuated to prepare for pressure testing, and the air can also be output upward to lift the packaging bag.

10. The on-line detection system for pressure resistance of liquid food packaging according to claim 9, characterized in that: The second track is perpendicular to the equipment wall and corresponds to the position of the bag opener, so that the clamping seat can be close to or far away from the bottom of the bag opener; A heat press is provided on the top of the heat-pressing and sealing part for heat-pressing and sealing the bottom of the packaging bag; the third track is parallel to the second track, and the third track is located between the second track and the equipment wall, so that the heat-pressing and sealing part can move back and forth under the packaging bag containing the finished product packaging box.

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