A paper cup sealing test device suitable for various capacity specifications

Abstract

This invention relates to the field of testing device technology, specifically to a paper cup sealing performance testing device applicable to various capacity specifications. The device includes a testing mechanism and a negative pressure mechanism. The testing mechanism includes multiple sealing rings, each with a rubber ring on its outer peripheral wall. The multiple sealing rings seal against the inner wall of the paper cup via the rubber rings, dividing the interior of the paper cup into multiple testing spaces. By applying test pressure to each testing space through the negative pressure mechanism, precise location of the leak point can be achieved: it can determine whether the leak occurs in the side wall area of ​​the paper cup, or whether the leak is at the connection between the side wall and the bottom of the cup, providing accurate data support for subsequent process improvements and effectively ensuring the overall sealing quality of the paper cup product. This invention provides a paper cup sealing performance testing device applicable to various capacity specifications to solve the problem that existing paper cup sealing performance testing devices cannot pinpoint the specific location of the leak.

Description

Technical Field

[0001] This invention relates to the field of testing device technology, and specifically to a paper cup sealing performance testing device applicable to various capacity specifications. Background Technology

[0002] A sealing test device is a specialized testing equipment that uses pressure, vacuum, and water immersion to detect whether a product leaks air or water, determining whether the seal is qualified. A paper cup sealing test device is a specialized device used to evaluate the sealing quality of finished paper cups. Paper cups are typically composed of a cup body (fan-shaped paper sheet) and a cup bottom (circular paper sheet) assembled through heat sealing or bonding processes. The cup body is made by rolling a fan-shaped paper sheet into a tube and then bonding it together using overlapping or butt joints. This longitudinal seam extending from the cup mouth to the cup bottom is also the weakest point in the structure. This makes the connection between the cup body and the cup bottom the most likely place for leakage. Currently, the sealing performance of paper cups is mostly tested manually by visual inspection or simple pressure methods, which are not only inefficient but also difficult to conduct uniform and standardized testing on paper cups of different sizes.

[0003] This device is primarily used in the quality inspection process of paper cup manufacturers, and is also suitable for quality inspection agencies or packaging laboratories to conduct random inspections or type tests on paper cup products. By simulating the actual working conditions of paper cups when filled with liquid or under pressure, it accurately evaluates the adhesion strength at the junction of the bottom and the cup body, the integrity of the film, and the overall sealing performance. The application of this device helps companies promptly reject products with poor sealing, optimize production processes, and ensure that paper cup products leaving the factory meet relevant national standards and customer requirements, providing reliable technical support for quality control in the paper cup industry.

[0004] For example, the invention patent application CN120760942A provides a negative pressure suction detection device for paper cup leakage testing. Through a set of air bladders, air pressure is used to inflate the bladders and seal them against the inner wall of the paper cup, achieving a reliable seal and effectively solving the problem of insufficient sealing in existing detection devices. However, this device still has limitations in practical applications: it can only determine whether a paper cup is leaking, but it cannot accurately locate the specific location of the leak, i.e., it cannot distinguish whether the leakage is at the bottom of the cup or a break in the side wall of the cup. This brings difficulties to subsequent process improvements and defect tracing. Summary of the Invention

[0005] This invention provides a paper cup sealing performance testing device applicable to various capacity specifications, in order to solve the problem that existing paper cup sealing performance testing devices cannot locate the specific location of leakage.

[0006] The present invention provides a paper cup sealing performance testing device applicable to various capacity specifications, employing the following technical solution: A paper cup sealing performance testing device applicable to various capacity specifications includes a base, a lifting plate, a testing mechanism, and a negative pressure mechanism, with the paper cup positioned on the base. The lifting plate is slidably mounted on the base and located above the paper cup.

[0007] The detection mechanism is mounted on a lifting plate and extends into the paper cup. The mechanism includes multiple sealing rings located on the lower side of the lifting plate, with the sealing rings vertically aligned axially. The sealing rings are arranged sequentially from top to bottom, with their diameters gradually decreasing from top to bottom. The distance between adjacent sealing rings is adjustable. A rubber ring is fixedly mounted on the outer peripheral wall of each sealing ring, coaxially positioned with the sealing ring, and abuts against the inner wall of the paper cup.

[0008] Multiple sealing rings are fitted with the inner wall of the paper cup via rubber rings, dividing the interior of the paper cup into multiple detection spaces. A negative pressure mechanism is used to apply detection pressure to each detection space. A detector is installed on the lower side of each sealing ring, and each detector is located in its corresponding detection space to detect the sealing performance within that space.

[0009] Furthermore, the multiple sealing rings are arranged from top to bottom as a first connecting ring, a second connecting ring, a third connecting ring, and a fourth connecting ring, wherein there is at least one second connecting ring. When there are multiple second connecting rings, they are distributed from top to bottom.

[0010] A coaxial first connecting cylinder is fixedly installed on the inner side of the first connecting ring, and the first connecting cylinder is fixedly connected to the lifting plate. The first connecting ring and the second connecting ring are connected by a first connecting spring. The second connecting ring and the third connecting ring are connected by a second connecting spring. The third connecting ring and the fourth connecting ring are connected by a third connecting spring.

[0011] Furthermore, a coaxial second connecting cylinder is fixedly disposed on the inner side of the second connecting ring, and the second connecting cylinder is slidably disposed within the first connecting cylinder. A coaxial third connecting cylinder is fixedly disposed on the inner side of the third connecting ring, and the third connecting cylinder is slidably disposed within the second connecting cylinder. A coaxial fourth connecting cylinder is fixedly disposed on the inner side of the fourth connecting ring, and the fourth connecting cylinder is slidably disposed within the third connecting cylinder.

[0012] Each of the first connecting cylinder, the second connecting cylinder, and the third connecting cylinder is provided with a first locking mechanism. The first locking mechanism includes a slider and a locking spring. The slider can slide along the radial direction of the first connecting cylinder.

[0013] A first mounting groove is formed on the outer wall of the second connecting cylinder, a second mounting groove is formed on the outer wall of the third connecting cylinder, and a third mounting groove is formed on the outer wall of the fourth connecting cylinder. A locking spring on the first connecting cylinder connects the slider and the first connecting cylinder, and the slider on the first connecting cylinder can extend into the first mounting groove to lock the first and second connecting cylinders. A locking spring on the second connecting cylinder connects the slider and the second connecting cylinder, and the slider on the second connecting cylinder can extend into the second mounting groove to lock the second and third connecting cylinders. A locking spring on the third connecting cylinder connects the slider and the third connecting cylinder, and the slider on the third connecting cylinder can extend into the third mounting groove to lock the third and fourth connecting cylinders.

[0014] Furthermore, the rubber ring on the first connecting ring is the first sealing ring. The rubber ring on the second connecting ring is the second sealing ring. The rubber ring on the third connecting ring is the third sealing ring. The rubber ring on the fourth connecting ring is the fourth sealing ring. All four sealing rings—the first, second, third, and fourth—are filled with hydraulic oil. Each of the first, second, and third mounting grooves is equipped with a baffle, which can slide radially along the first connecting cylinder. Each baffle abuts against its corresponding slider.

[0015] The second connecting ring has a first connecting oil passage that connects the second sealing ring and the first mounting groove. When the second sealing ring is deformed under pressure, the hydraulic oil inside the second sealing ring enters the first mounting groove through the first connecting oil passage, driving the baffle and slider within the first mounting groove to move radially, thereby releasing the lock between the first and second connecting cylinders. The third connecting ring has a second connecting oil passage that connects the third sealing ring and the second mounting groove. The fourth connecting ring has a third connecting oil passage that connects the fourth sealing ring and the third mounting groove.

[0016] Furthermore, a paper cup sealing test device applicable to multiple capacity specifications also includes a second locking mechanism, which includes a first locking component and a second locking component.

[0017] A first groove is formed inside the first connecting ring, and the first groove communicates with the first sealing ring. The first locking assembly includes a first limiting block. The first limiting block can slide radially along the first connecting ring, and the first limiting block is used for frictional contact with the outer wall of the second connecting cylinder. After the first sealing ring is deformed by pressure, hydraulic oil pushes the first limiting block and the second connecting cylinder to abut against each other, thereby locking the first connecting cylinder and the second connecting cylinder.

[0018] A second sliding groove is formed inside the second connecting ring, and the second sliding groove communicates with the second sealing ring. The second locking assembly includes a second limiting block. The second limiting block is capable of sliding radially along the second connecting ring, and the second limiting block is used for frictional contact with the outer wall of the third connecting cylinder.

[0019] Furthermore, a first check valve is provided at the connection between the first slide groove and the first sealing ring, allowing hydraulic oil in the first sealing ring to enter the first slide groove. A first return oil channel is also provided in the first connecting ring, connecting the first slide groove and the first sealing ring, and the first return oil channel is filled with damping fluid to slow down the speed at which hydraulic oil in the first slide groove flows back to the first sealing ring.

[0020] A second check valve is provided at the connection between the second slide groove and the second sealing ring. The second check valve allows hydraulic oil in the second sealing ring to enter the second slide groove. A second return oil channel is also provided in the second connecting ring. The second return oil channel connects the second slide groove and the second sealing ring, and damping fluid is provided in the second return oil channel.

[0021] Furthermore, the negative pressure mechanism includes an air pump, which is mounted on the base and is connected to multiple detection spaces.

[0022] Furthermore, a paper cup sealing performance testing device suitable for various capacity specifications also includes a support mechanism. The support mechanism comprises multiple support components distributed circumferentially along the first connecting cylinder. Each support component includes a threaded rod and a diagonal rod. The threaded rod is radially arranged along the first connecting cylinder and rotatably mounted on a base about its own axis. The diagonal rod is inclined. A connecting block is fixedly mounted at the lower end of the diagonal rod, and the connecting block is slidably mounted on the base along the radial direction of the first connecting cylinder. The connecting block and the threaded rod are helically coupled. The paper cup is placed within the space enclosed by the multiple diagonal rods.

[0023] Furthermore, each threaded rod has a first bevel gear at one end, and the first bevel gear and the threaded rod are coaxially arranged. The support mechanism also includes a first motor, which is mounted on the base. A coaxial second bevel gear is fixedly mounted on the output shaft of the first motor, and the second bevel gear meshes with multiple first bevel gears.

[0024] Furthermore, the base is equipped with a second motor, a synchronous belt, and multiple lead screws, which are distributed sequentially along the circumference of the lifting plate. Each lead screw is vertically positioned and can rotate around its own axis. The lifting plate and the lead screws are engaged in a helical drive. The synchronous belt connects the multiple lead screws, and the output shaft of the second motor is fixedly connected to the lower end of one of the lead screws.

[0025] The beneficial effects of this invention are as follows: This invention provides a paper cup sealing performance testing device applicable to various capacity specifications. By setting multiple sealing rings, each with a rubber ring embedded on its outer circumference, the rubber ring forms an elastic seal with the inner wall of the paper cup under pressure, thereby dividing the interior of the paper cup into multiple independent testing spaces. By applying test pressure to each testing space through a negative pressure mechanism, this device can accurately locate the leakage point: it can determine whether the leakage occurs in the side wall area of ​​the paper cup, and it can also identify whether the leakage is at the connection between the side wall and the bottom of the cup, providing accurate data support for subsequent process improvements and effectively ensuring the overall sealing quality of the paper cup product.

[0026] Furthermore, the diameter of each sealing ring decreases sequentially from top to bottom along the device, and the axial spacing between adjacent sealing rings is adjustable. This structural design allows the device to flexibly adapt to paper cups of different heights, diameters, and tapers, significantly improving the equipment's versatility and testing efficiency, and meeting the batch testing needs of paper cups with various capacities. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 A schematic diagram of a paper cup sealing performance testing device applicable to various capacity specifications provided in an embodiment of the present invention; Figure 2 A front view of a paper cup sealing performance testing device applicable to various capacity specifications, provided in an embodiment of the present invention; Figure 3 for Figure 2 Sectional view along the middle AA direction; Figure 4 A schematic diagram of the support mechanism for a paper cup sealing performance testing device applicable to various capacity specifications, provided in an embodiment of the present invention; Figure 5 A schematic diagram of the detection mechanism of a paper cup sealing performance testing device applicable to various capacity specifications, provided in an embodiment of the present invention; Figure 6 A top view of the testing mechanism of a paper cup sealing performance testing device applicable to various capacity specifications, provided in an embodiment of the present invention; Figure 7 for Figure 6 Sectional view along the BB direction; Figure 8 for Figure 6 A cross-sectional view along the CC direction; Figure 9 for Figure 8 Enlarged view of point G in the middle; Figure 10 An exploded view of the detection mechanism of a paper cup sealing performance testing device applicable to various capacity specifications, provided in an embodiment of the present invention; Figure 11 A partial structural diagram of the detection mechanism of a paper cup sealing performance testing device applicable to various capacity specifications, provided in an embodiment of the present invention; Figure 12 for Figure 11 Sectional view along the DD direction; Figure 13 A partial bottom view of the detection mechanism of a paper cup sealing performance testing device applicable to various capacity specifications, provided in an embodiment of the present invention; Figure 14 for Figure 13 A sectional view along the EE direction; Figure 15 for Figure 13 Sectional view along the FF direction.

[0029] In the diagram: 100, base; 110, lead screw; 120, threaded rod; 130, diagonal rod; 140, second bevel gear; 200, first motor; 210, paper cup; 300, lifting plate; 400, first connecting spring; 410, second connecting spring; 420, third connecting spring; 500, first connecting ring; 501, first sealing ring; 510, first connecting cylinder; 511, first air passage; 600, second connecting ring; 601, second sealing ring; 602, second slide groove; 603, second limiting block; 604, second limiting spring; 605, the... Second oil return channel; 610, First air ring; 611, Second air passage; 620, Second connecting cylinder; 621, First connecting oil passage; 622, First mounting groove; 700, Third connecting ring; 701, Third sealing ring; 710, Second air ring; 711, Third air passage; 720, Third connecting cylinder; 750, Locking spring; 760, Slider; 770, Baffle; 800, Fourth connecting ring; 801, Fourth sealing ring; 810, Third air ring; 811, Fourth air passage; 820, Fourth connecting cylinder; 821, Third connecting oil passage; 900, Detector. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] Reference Figures 1 to 15 As shown in the figure, an embodiment of the present invention provides a paper cup sealing performance testing device applicable to various capacity specifications, including a base 100, a lifting plate 300, a testing mechanism, and a negative pressure mechanism, with the paper cup 210 positioned on the base 100. The lifting plate 300 is slidably disposed on the base 100 and located above the paper cup 210.

[0032] The detection mechanism is mounted on the lifting plate 300 and extends into the paper cup 210. The detection mechanism includes multiple sealing rings located on the lower side of the lifting plate 300, with the sealing rings vertically aligned axially. The sealing rings are distributed sequentially from top to bottom, with their diameters gradually decreasing from top to bottom. The distance between adjacent sealing rings is adjustable. By adjusting the distance between two sealing rings, the taper of the frustum formed by the two adjacent sealing rings can be changed; a larger distance results in a smaller taper, and a smaller distance results in a larger taper, thus adapting to different sizes of paper cups 210. A rubber ring is fixedly mounted on the outer peripheral wall of each sealing ring, coaxially arranged with the sealing ring, and abuts against the inner wall of the paper cup 210.

[0033] Multiple sealing rings are sealed to the inner wall of the paper cup 210 via rubber rings, dividing the interior of the paper cup 210 into multiple detection spaces. A negative pressure mechanism is used to apply detection pressure to each detection space. A detector 900 is installed on the lower side of each sealing ring, and each detector 900 is located within its corresponding detection space to detect the sealing performance within that space. Because the interior of the paper cup 210 is divided into multiple independent detection spaces, this device can accurately locate the leakage point, detecting whether the leakage is from the side wall of the paper cup 210 or from the connection between the side wall and the bottom of the cup, providing precise evidence for process improvement and ensuring product quality.

[0034] In this embodiment, the multiple sealing rings are arranged from top to bottom as a first connecting ring 500, a second connecting ring 600, a third connecting ring 700 and a fourth connecting ring 800, wherein there is at least one second connecting ring 600.

[0035] A coaxial first connecting cylinder 510 is fixedly disposed on the inner side of the first connecting ring 500, and the first connecting cylinder 510 is fixedly connected to the lifting plate 300. The first connecting ring 500 and the second connecting ring 600 are connected by a first connecting spring 400, so that the distance between the first connecting ring 500 and the second connecting ring 600 is adjustable. The second connecting ring 600 and the third connecting ring 700 are connected by a second connecting spring 410, so that the distance between the second connecting ring 600 and the third connecting ring 700 is adjustable. The third connecting ring 700 and the fourth connecting ring 800 are connected by a third connecting spring 420, so that the distance between the third connecting ring 700 and the fourth connecting ring 800 is adjustable.

[0036] In other embodiments, there are multiple second connecting rings 600, which are distributed sequentially from top to bottom.

[0037] In this embodiment, a coaxial second connecting cylinder 620 is fixedly disposed on the inner side of the second connecting ring 600, and the second connecting cylinder 620 is slidably disposed within the first connecting cylinder 510. A coaxial third connecting cylinder 720 is fixedly disposed on the inner side of the third connecting ring 700, and the third connecting cylinder 720 is slidably disposed within the second connecting cylinder 620. A coaxial fourth connecting cylinder 820 is fixedly disposed on the inner side of the fourth connecting ring 800, and the fourth connecting cylinder 820 is slidably disposed within the third connecting cylinder 720.

[0038] Each of the first connecting cylinder 510, the second connecting cylinder 620 and the third connecting cylinder 720 is provided with a first locking mechanism. The first locking mechanism includes a slider 760 and a locking spring 750. The slider 760 can slide along the radial direction of the first connecting cylinder 510.

[0039] The second connecting cylinder 620 has a first mounting groove 622 on its outer wall, the third connecting cylinder 720 has a second mounting groove on its outer wall, and the fourth connecting cylinder 820 has a third mounting groove on its outer wall. A locking spring 750 on the first connecting cylinder 510 connects the slider 760 and the first connecting cylinder 510, and the slider 760 on the first connecting cylinder 510 can extend into the first mounting groove 622 to lock the first connecting cylinder 510 and the second connecting cylinder 620. Similarly, a locking spring 750 on the second connecting cylinder 620 connects the slider 760 and the second connecting cylinder 620, and the slider 760 on the second connecting cylinder 620 can extend into the second mounting groove to lock the second connecting cylinder 620 and the third connecting cylinder 720. Likewise, a locking spring 750 on the third connecting cylinder 720 connects the slider 760 and the third connecting cylinder 720, and the slider 760 on the third connecting cylinder 720 can extend into the third mounting groove to lock the third connecting cylinder 720 and the fourth connecting cylinder 820.

[0040] A first limiting groove is provided on the inner wall of the first connecting cylinder 510. The slider 760 in the first locking mechanism on the first connecting cylinder 510 is the first block, and the locking spring 750 is the first spring. The first block is slidably disposed in the first limiting groove, and the first spring connects the first block and the bottom wall of the first limiting groove.

[0041] The inner wall of the second connecting cylinder 620 is provided with a second limiting groove. The slider 760 in the first locking mechanism on the second connecting cylinder 620 is the second block, and the locking spring 750 is the second spring. The second block is slidably disposed in the second limiting groove, and the second spring connects the bottom wall of the second block and the second limiting groove.

[0042] A third limiting groove is provided on the inner wall of the third connecting cylinder 720. The slider 760 in the first locking mechanism on the third connecting cylinder 720 is the third block, and the locking spring 750 is the third spring. The third block is slidably disposed in the third limiting groove, and the third spring connects the third block and the bottom wall of the third limiting groove.

[0043] In this embodiment, the rubber ring on the first connecting ring 500 is the first sealing ring 501. The rubber ring on the second connecting ring 600 is the second sealing ring 601. The rubber ring on the third connecting ring 700 is the third sealing ring 701. The rubber ring on the fourth connecting ring 800 is the fourth sealing ring 801. All four sealing rings (501, 601, 701, and 801) are filled with hydraulic oil. Each of the first mounting groove 622, the second mounting groove, and the third mounting groove is provided with a baffle 770, which can slide radially along the first connecting cylinder 510. Each baffle 770 is used to abut against the corresponding slider 760.

[0044] The second connecting ring 600 has a first connecting oil passage 621, which connects the second sealing ring 601 and the first mounting groove 622. After the second sealing ring 601 is deformed by pressure, the hydraulic oil inside the second sealing ring 601 enters the first mounting groove 622 through the first connecting oil passage 621, driving the baffle 770 and the slider 760 in the first mounting groove 622 to move radially, thereby releasing the lock between the first connecting cylinder 510 and the second connecting cylinder 620. The third connecting ring 700 has a second connecting oil passage, which connects the third sealing ring 701 and the second mounting groove. The fourth connecting ring 800 has a third connecting oil passage 821, which connects the fourth sealing ring 801 and the third mounting groove.

[0045] In this embodiment, a paper cup sealing performance testing device applicable to multiple capacity specifications further includes a second locking mechanism, which includes a first locking component and a second locking component.

[0046] A first groove is formed inside the first connecting ring 500, and the first groove communicates with the first sealing ring 501. The first locking assembly includes a first limiting block and a first limiting spring. The first limiting block can slide radially along the first connecting ring 500, and the first limiting block is used for frictional contact with the outer wall of the second connecting cylinder 620. The first limiting spring connects the first limiting block and the bottom wall of the first groove. After the first sealing ring 501 is deformed by pressure, hydraulic oil pushes the first limiting block and the second connecting cylinder 620 to abut against each other, thereby locking the first connecting cylinder 510 and the second connecting cylinder 620.

[0047] A second groove 602 is formed inside the second connecting ring 600, and the second groove 602 communicates with the second sealing ring 601. The second locking assembly includes a second limiting block 603 and a second limiting spring 604. The second limiting block 603 can slide radially along the second connecting ring 600 and is used for frictional contact with the outer wall of the third connecting cylinder 720. The second limiting spring 604 connects the second limiting block 603 and the bottom wall of the second groove 602. After the second sealing ring 601 is deformed by pressure, hydraulic oil pushes the second limiting block 603 and the third connecting cylinder 720 to abut against each other, thereby locking the second connecting cylinder 620 and the third connecting cylinder 720.

[0048] In other embodiments, there are multiple second connecting rings 600, and a first locking mechanism and a second locking mechanism are provided between two adjacent second connecting rings 600.

[0049] In this embodiment, a first check valve is provided at the connection between the first slide groove and the first sealing ring 501. The first check valve allows hydraulic oil in the first sealing ring 501 to enter the first slide groove. A first return oil channel is also provided in the first connecting ring 500. The first return oil channel connects the first slide groove and the first sealing ring 501, and the first return oil channel is filled with damping fluid to slow down the speed at which hydraulic oil in the first slide groove flows back to the first sealing ring 501.

[0050] A second check valve is provided at the connection between the second slide groove 602 and the second sealing ring 601. The second check valve allows hydraulic oil in the second sealing ring 601 to enter the second slide groove 602. A second return oil channel 605 is also provided in the second connecting ring 600. The second return oil channel 605 connects the second slide groove 602 and the second sealing ring 601, and damping fluid is provided in the second return oil channel 605 to slow down the speed at which hydraulic oil in the second slide groove 602 flows back to the second sealing ring 601.

[0051] In this embodiment, a first air passage 511 is provided on the first connecting cylinder 510, and the first air passage 511 communicates with the detection space between the first connecting cylinder 510 and the second connecting cylinder 620. A first air ring 610, a second air ring 710 and a third air ring 810 are fixedly provided on the lifting plate 300 and are coaxially arranged with the first connecting cylinder 510.

[0052] The first air ring 610 is located inside the first connecting cylinder 510, and a first air pipe is fixedly installed on the first air ring 610, with the first air pipe being vertically arranged. A second air passage 611 is opened on the second connecting cylinder 620, and the second air passage 611 communicates with the detection space between the second connecting cylinder 620 and the third connecting cylinder 720. The first air pipe is slidably disposed within and communicates with the second air passage 611.

[0053] The second air ring 710 is located inside the second connecting cylinder 620, and a second air pipe is fixedly installed on the second air ring 710, with the second air pipe being vertically arranged. A third air passage 711 is opened on the third connecting cylinder 720, and the third air passage 711 communicates with the detection space between the third connecting cylinder 720 and the fourth connecting cylinder 820. The second air pipe is slidably arranged inside the third air passage 711 and communicates with the third air passage 711.

[0054] The third air ring 810 is located inside the third connecting cylinder 720, and a third air pipe is fixedly installed on the third air ring 810, with the third air pipe being vertically arranged. A fourth air passage 811 is opened on the fourth connecting cylinder 820, and the fourth air passage 811 communicates with the detection space between the fourth connecting cylinder 820 and the bottom of the paper cup 210. The third air pipe is slidably arranged inside the fourth air passage 811 and communicates with the fourth air passage 811.

[0055] The negative pressure mechanism includes an air pump, which is mounted on the base 100 and is connected to the first air passage 511, the first air pipe, the second air pipe, and the third air pipe.

[0056] In this embodiment, a paper cup sealing test device applicable to multiple capacity specifications further includes a support mechanism, which includes multiple support components distributed circumferentially along the first connecting cylinder 510.

[0057] Each support assembly includes a threaded rod 120 and a diagonal rod 130. The threaded rod 120 is arranged radially along the first connecting cylinder 510 and is rotatably mounted on the base 100 about its own axis. The diagonal rod 130 is inclined and gradually approaches the axis of the first connecting cylinder 510 from top to bottom. A connecting block is fixedly mounted on the lower end of the diagonal rod 130, and the connecting block is slidably mounted on the base 100 along the radial direction of the first connecting cylinder 510. The connecting block and the threaded rod 120 are engaged by a helical drive. The paper cup 210 is placed in the space enclosed by the multiple diagonal rods 130.

[0058] In this embodiment, a first bevel gear is fixedly mounted on one end of each threaded rod 120 near the axis of the first connecting cylinder 510, and the first bevel gear and the threaded rod 120 are coaxially arranged. The support mechanism also includes a first motor 200, which is fixedly mounted on the base 100. A coaxial second bevel gear 140 is fixedly mounted on the output shaft of the first motor 200, and the second bevel gear 140 meshes with multiple first bevel gears.

[0059] The first motor 200 rotates forward and drives multiple first bevel gears to rotate via the second bevel gear 140, which in turn drives multiple threaded rods 120 to rotate forward. When the threaded rods 120 rotate forward, they drive the connecting block to move toward the axis closer to the first connecting cylinder 510.

[0060] The first motor 200 reverses and drives multiple first bevel gears to rotate via the second bevel gear 140, which in turn drives multiple threaded rods 120 to rotate in the opposite direction. When the threaded rods 120 rotate in the opposite direction, they drive the connecting block to move away from the axis of the first connecting cylinder 510.

[0061] In this embodiment, a second motor, a tensioning pulley, a timing belt, and multiple lead screws 110 are mounted on the base 100. The lead screws 110 are distributed sequentially along the circumference of the lifting plate 300. Each lead screw 110 is vertically positioned and can rotate around its own axis. The lifting plate 300 and the lead screws 110 are engaged by a helical drive. The tensioning pulley has a vertical axis and can rotate around its own axis. The timing belt connects the tensioning pulley and the multiple lead screws 110, and the tensioning pulley is used to maintain appropriate tension.

[0062] The output shaft of the second motor is fixedly connected to the lower end of one of the lead screws 110. When the second motor rotates forward, it drives the lead screw 110 to rotate in the forward direction, which in turn moves the lifting plate 300 downward. When the second motor rotates in reverse, it drives the lead screw 110 to rotate in the reverse direction, which in turn moves the lifting plate 300 upward.

[0063] Working process: In the initial state, the first block is embedded in the first mounting groove 622, the second block is embedded in the second mounting groove, and the third block is embedded in the third mounting groove. The first limiting block does not contact the outer wall of the second connecting cylinder 620, and the second limiting block 603 does not contact the outer wall of the third connecting cylinder 720.

[0064] The paper cup 210 to be tested is placed in the space enclosed by multiple inclined rods 130. The first motor 200 is started, and the first motor 200 rotates forward, driving multiple first bevel gears to rotate through the second bevel gear 140. This, in turn, drives multiple threaded rods 120 to rotate forward. When the threaded rods 120 rotate forward, they drive the connecting block to move towards the axis of the first connecting cylinder 510, thereby causing the inclined rods 130 to gradually converge towards the center until the inclined rods 130 abut against the outer wall of the paper cup 210. Since the position of the inclined rods 130 is adjustable, this support mechanism can achieve stable support for paper cups 210 of different diameters.

[0065] Next, the second motor is started to rotate forward, driving the lead screw 110 to rotate in the forward direction. The lead screw 110 drives the lifting plate 300 to move downward. At this time, due to the action of the first locking mechanism (the first piece is embedded in the first mounting groove 622, the second piece is embedded in the second mounting groove, and the third piece is embedded in the third mounting groove), the first connecting cylinder 510, the second connecting cylinder 620, the third connecting cylinder 720, and the fourth connecting cylinder 820 remain locked to each other. Therefore, the lifting plate 300 drives the first connecting cylinder 510, the second connecting cylinder 620, the third connecting cylinder 720, and the fourth connecting cylinder 820 to move downward synchronously as a whole.

[0066] The fourth sealing ring 801 initially abuts against the inner wall of the paper cup 210. As the lifting plate 300 continues to descend, the fourth sealing ring 801 is compressed, hindering its downward movement. The fourth sealing ring 801 deforms under pressure, and the hydraulic oil inside is forced into the third mounting groove through the third connecting oil passage 821. This pushes the baffle 770 and the third block within the third mounting groove to move radially away from the axis of the fourth connecting cylinder 820, causing the third block to exit the third mounting groove and thus releasing the lock between the third connecting cylinder 720 and the fourth connecting cylinder 820.

[0067] After the lock is released, the lifting plate 300 continues to descend, the third connecting spring 420 is compressed, and the third connecting cylinder 720 and the fourth connecting cylinder 820 move relative to each other. Subsequently, the third sealing ring 701 contacts the inner wall of the paper cup 210 and begins to be compressed. The third sealing ring 701 deforms under pressure, and the hydraulic oil inside it enters the second mounting groove through the second connecting oil passage, pushing the baffle 770 and the second block in the second mounting groove to move radially, causing the second block to exit from the second mounting groove, thereby releasing the lock between the second connecting cylinder 620 and the third connecting cylinder 720.

[0068] After the locking between the second connecting cylinder 620 and the third connecting cylinder 720 is released, the lifting plate 300 continues to descend, and the second connecting spring 410 is compressed. The second sealing ring 601 contacts and is compressed against the inner wall of the paper cup 210. Two actions occur at this time: Unlocking action: The second sealing ring 601 is deformed by pressure, and the hydraulic oil inside it enters the first mounting groove 622 through the first connecting oil passage 621, pushing the baffle 770 and the first block in the first mounting groove 622 to move radially, so that the first block is removed from the first mounting groove 622, and the lock between the first connecting cylinder 510 and the second connecting cylinder 620 is released.

[0069] Locking action: Simultaneously, hydraulic oil in the second sealing ring 601 enters the second slide groove 602 through the second check valve, pushing the second limiting block 603 to move radially towards the axis of the second connecting cylinder 620 until the second limiting block 603 is tightly abutted against the outer wall of the third connecting cylinder 720. At this time, the second connecting cylinder 620 and the third connecting cylinder 720 re-establish connection through friction locking.

[0070] After the locking of the first connecting cylinder 510 and the second connecting cylinder 620 is released, the lifting plate 300 continues to descend, and the first connecting spring 400 is compressed. Due to the stepwise arrangement of the first connecting spring 400, the second connecting spring 410, and the third connecting spring 420, as well as the synergistic effect of the first locking mechanism and the second locking mechanism, the sealing rings achieve graded contact: the fourth sealing ring 801 first abuts against and presses against the paper cup 210 before the third sealing ring 701 begins to contact. After the third sealing ring 701 is pressed, the second sealing ring 601 begins to contact. After the second sealing ring 601 is pressed, the first sealing ring 501 begins to contact. This graded loading method ensures that the first sealing ring 501, the second sealing ring 601, and the third sealing ring 701 can all form sufficient sealing contact with the inner wall of the paper cup 210, avoiding sealing failure due to insufficient elasticity. At the same time, the graded compression causes the elastic force of the first connecting spring 400, the second connecting spring 410, and the third connecting spring 420 to be distributed step by step by the second connecting ring 600, the third connecting ring 700, and the fourth connecting ring 800. This prevents the compressive force of the first connecting spring 400, the second connecting spring 410, and the third connecting spring 420 from acting simultaneously on the fourth connecting ring 800, thus avoiding excessive pressure on the fourth connecting ring 800 and damage to the paper cup 210.

[0071] After the first sealing ring 501 contacts and is compressed against the inner wall of the paper cup 210, the hydraulic oil inside the first sealing ring 501 enters the first slide groove through the first one-way valve, pushing the first limiting block to move radially toward the second connecting cylinder 620 until the first limiting block is tightly abutted against the outer wall of the second connecting cylinder 620. At this time, the first connecting cylinder 510 and the second connecting cylinder 620 re-establish a connection through friction locking.

[0072] After the sealing process is completed, the air pump is started, and detection pressure is applied to each detection space through the first air passage 511, the first air pipe, the second air pipe, and the third air pipe. The detector 900 installed in each detection space begins to monitor the pressure changes in the corresponding space in real time, thereby determining the sealing performance of that area. Since the inside of the paper cup 210 is divided into multiple independent detection spaces by multiple sealing rings, this device can accurately locate the leakage point (whether it is a leak in the side wall of the paper cup 210 or a leak at the connection between the side wall and the bottom of the cup), providing precise basis for process improvement and ensuring product quality.

[0073] After the test is completed, the second motor is started in reverse. The second motor drives the lifting plate 300 to move upward via the lead screw 110. Since the first connecting cylinder 510 and the second connecting cylinder 620 are in a friction-locked state, and the second connecting cylinder 620 and the third connecting cylinder 720 are also in a friction-locked state, when the lifting plate 300 moves upward, it drives the first connecting cylinder 510, the second connecting cylinder 620 and the third connecting cylinder 720 to move upward synchronously, and the third connecting spring 420 gradually returns to its original position.

[0074] Because the first and second return oil channels 605 are filled with damping fluid, the hydraulic oil return speed in the first and second slide grooves 602 is slow, thus the unlocking process of the first and second limit blocks 603 is slow. This causes a delay in the separation of the first sealing ring 501, the second sealing ring 601 from the inner wall of the paper cup 210, and the reset of the first connecting spring 400 and the second connecting spring 410 is also delayed accordingly.

[0075] After the test is completed, the second motor is started. The second motor rotates in reverse, driving the lifting plate 300 upward via the lead screw 110. The lifting plate 300 first drives the first connecting ring 500 upward. Because the first connecting cylinder 510 and the second connecting cylinder 620 are locked together, and the second connecting cylinder 620 and the third connecting cylinder 720 are locked together, when the lifting plate 300 moves upward, it drives the first connecting cylinder 510, the second connecting cylinder 620 and the third connecting cylinder 720 to move upward synchronously, and the third connecting spring 420 gradually resets. Due to the damping effect in the first oil return channel and the second oil return channel 605, the unlocking process between the first connecting cylinder 510 and the second connecting cylinder 620, and between the second connecting cylinder 620 and the third connecting cylinder 720, is relatively slow. This slows down the reset action of the first sealing ring 501 and the second sealing ring 601, further slowing down the reset speed of the first connecting spring 400 and the second connecting spring 410, and ultimately slowing down the reset action of the third sealing ring 701. Therefore, the first sealing ring 501, the second sealing ring 601 and the third sealing ring 701 only need to move upward a very short distance to disengage from the inner wall of the paper cup 210. At this time, the third connecting spring 420 is still in the process of resetting, and the fourth sealing ring 801 has not yet disengaged from the paper cup 210.

[0076] As the third connecting spring 420 continues to reset, the pressure exerted by the third connecting spring 420 on the fourth sealing ring 801 continuously decreases, and the fourth sealing ring 801 gradually resets, thus gradually reducing the friction between the fourth sealing ring 801 and the paper cup 210. Under its own elasticity, the fourth sealing ring 801 gradually resets, further reducing the friction between the fourth sealing ring 801 and the inner wall of the paper cup 210. When the third connecting spring 420 resets to the point where it can move the fourth connecting ring 800 upwards, the friction between the fourth sealing ring 801 and the inner wall of the paper cup 210 approaches zero. At this point, the fourth sealing ring 801 moves upwards with the fourth connecting ring 800 without causing scratches, breakage, or other damage to the inner wall of the paper cup 210, ensuring the integrity of the paper cup 210 after testing, protecting the testing mechanism, and extending the service life of the equipment.

[0077] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A paper cup sealing test device suitable for multiple capacity specifications, comprising a base, a lifting plate, a detection mechanism and a negative pressure mechanism, wherein: the paper cup is placed on the base; the lifting plate is slidably arranged on the base above the paper cup; the detection mechanism is arranged on the lifting plate and used to extend into the paper cup; the detection mechanism comprises multiple sealing rings, the sealing rings are arranged on the lower side of the lifting plate, and the axial direction of the sealing rings is vertically arranged; the multiple sealing rings are sequentially arranged from top to bottom, and the diameters of the sealing rings gradually decrease from top to bottom, and the distance between two adjacent sealing rings is adjustable; a rubber ring is fixedly arranged on the outer peripheral wall of each sealing ring, the rubber ring and the sealing ring are coaxially arranged, and the rubber ring is used to abut against the inner wall of the paper cup; the multiple sealing rings are sealed and matched with the inner wall of the paper cup through the rubber ring, and the inside of the paper cup is divided into multiple detection spaces; the negative pressure mechanism is used to apply a detection pressure to each detection space; and a detector is arranged on the lower side of each sealing ring, each detector is arranged in the corresponding detection space, and each detector is used to detect the sealing property in the corresponding detection space. 2.The paper cup sealing test device suitable for multiple capacity specifications according to claim 1, wherein: the multiple sealing rings are sequentially arranged from top to bottom as a first connecting ring, a second connecting ring, a third connecting ring and a fourth connecting ring, wherein the second connecting ring has at least one; when the second connecting ring has multiple second connecting rings, the multiple second connecting rings are sequentially arranged from top to bottom; an inner side of the first connecting ring is fixedly provided with a coaxial first connecting cylinder, the first connecting cylinder is fixedly connected with the lifting plate; the first connecting ring and the second connecting ring are connected through a first connecting spring; the second connecting ring and the third connecting ring are connected through a second connecting spring; and the third connecting ring and the fourth connecting ring are connected through a third connecting spring. 3.The paper cup sealing test device suitable for multiple capacity specifications according to claim 2, wherein: an inner side of the second connecting ring is fixedly provided with a coaxial second connecting cylinder, the second connecting cylinder is slidably arranged in the first connecting cylinder; an inner side of the third connecting ring is fixedly provided with a coaxial third connecting cylinder, the third connecting cylinder is slidably arranged in the second connecting cylinder; and an inner side of the fourth connecting ring is fixedly provided with a coaxial fourth connecting cylinder, the fourth connecting cylinder is slidably arranged in the third connecting cylinder; first locking mechanisms are arranged on the inner walls of the first connecting cylinder, the second connecting cylinder and the third connecting cylinder, the first locking mechanism comprises a sliding block and a locking spring, and the sliding block can slide along the radial direction of the first connecting cylinder; a first mounting groove is arranged on the outer wall of the second connecting cylinder, a second mounting groove is arranged on the outer wall of the third connecting cylinder, and a third mounting groove is arranged on the outer wall of the fourth connecting cylinder. ​ ​ ​ ​ ​ ​ ​ The locking spring on the first connecting cylinder connects the slider and the first connecting cylinder, and the slider on the first connecting cylinder can extend into the first mounting groove to lock the first connecting cylinder and the second connecting cylinder; the locking spring on the second connecting cylinder connects the slider and the second connecting cylinder, and the slider on the second connecting cylinder can extend into the second mounting groove to lock the second connecting cylinder and the third connecting cylinder; the locking spring on the third connecting cylinder connects the slider and the third connecting cylinder, and the slider on the third connecting cylinder can extend into the third mounting groove to lock the third connecting cylinder and the fourth connecting cylinder.

4. The sealing performance testing device for paper cups of various capacities according to claim 3, characterized in that: The rubber ring on the first connecting ring is the first sealing ring; the rubber ring on the second connecting ring is the second sealing ring; the rubber ring on the third connecting ring is the third sealing ring; the rubber ring on the fourth connecting ring is the fourth sealing ring; the first, second, third, and fourth sealing rings are all filled with hydraulic oil; a baffle is provided in the first, second, and third mounting grooves, and the baffle can slide radially along the first connecting cylinder; each baffle is used to abut against the corresponding slider; The second connecting ring has a first connecting oil passage that connects the second sealing ring and the first mounting groove. After the second sealing ring is deformed by pressure, the hydraulic oil in the second sealing ring enters the first mounting groove through the first connecting oil passage, driving the baffle and slider in the first mounting groove to move radially, thereby releasing the lock between the first connecting cylinder and the second connecting cylinder. The third connecting ring has a second connecting oil passage that connects the third sealing ring and the second mounting groove. The fourth connecting ring has a third connecting oil passage that connects the fourth sealing ring and the third mounting groove.

5. A paper cup sealing performance testing device applicable to various capacity specifications according to claim 4, characterized in that: It also includes a second locking mechanism, which comprises a first locking component and a second locking component; A first groove is provided inside the first connecting ring, and the first groove communicates with the first sealing ring; the first locking component includes a first limiting block; the first limiting block can slide along the radial direction of the first connecting ring, and the first limiting block is used for frictional contact with the outer wall of the second connecting cylinder; after the first sealing ring is deformed by pressure, hydraulic oil pushes the first limiting block and the second connecting cylinder to abut against each other, thereby locking the first connecting cylinder and the second connecting cylinder. The second connecting ring has a second sliding groove, which is connected to the second sealing ring; the second locking component includes a second limiting block; the second limiting block can slide radially along the second connecting ring, and the second limiting block is used to make frictional contact with the outer wall of the third connecting cylinder.

6. The sealing performance testing device for paper cups of various capacities according to claim 5, characterized in that: A first check valve is provided at the connection between the first slide groove and the first sealing ring. The first check valve allows the hydraulic oil in the first sealing ring to enter the first slide groove. A first return oil channel is also provided in the first connecting ring. The first return oil channel connects the first slide groove and the first sealing ring, and the first return oil channel is filled with damping fluid to slow down the speed at which the hydraulic oil in the first slide groove flows back to the first sealing ring. A second check valve is provided at the connection between the second slide groove and the second sealing ring. The second check valve allows the hydraulic oil in the second sealing ring to enter the second slide groove. A second return oil channel is also provided in the second connecting ring. The second return oil channel connects the second slide groove and the second sealing ring, and damping fluid is provided in the second return oil channel.

7. The sealing performance testing device for paper cups of various capacities according to claim 1, characterized in that: The negative pressure mechanism includes an air pump, which is mounted on a base and is connected to multiple detection spaces.

8. A paper cup sealing performance testing device applicable to various capacity specifications according to claim 2, characterized in that: It also includes a support mechanism, which comprises multiple support components distributed circumferentially along the first connecting cylinder; each support component includes a threaded rod and a diagonal rod; the threaded rod is arranged radially along the first connecting cylinder and is rotatably mounted on the base around its own axis; the diagonal rod is inclined; a connecting block is fixedly mounted at the lower end of the diagonal rod, and the connecting block is slidably mounted on the base along the radial direction of the first connecting cylinder; the connecting block and the threaded rod are engaged by a helical drive; the paper cup is placed in the space enclosed by the multiple diagonal rods.

9. A paper cup sealing performance testing device applicable to various capacity specifications according to claim 8, characterized in that: Each threaded rod has a first bevel gear at one end, and the first bevel gear and the threaded rod are coaxially arranged; the support mechanism also includes a first motor, which is mounted on the base, and a coaxial second bevel gear is fixedly mounted on the output shaft of the first motor, and the second bevel gear meshes with multiple first bevel gears.

10. A paper cup sealing performance testing device applicable to various capacity specifications according to claim 1, characterized in that: The base is equipped with a second motor, a synchronous belt, and multiple lead screws, which are distributed sequentially along the circumference of the lifting plate. Each lead screw is vertically positioned and can rotate around its own axis. The lifting plate and the lead screws are engaged in helical transmission. The synchronous belt connects the multiple lead screws, and the output shaft of the second motor is fixedly connected to the lower end of one of the lead screws.

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