A plastic container tank leak testing and shaping device and method

Abstract

The present application relates to the technical field of container leak detection and shaping, and particularly relates to a plastic container tank leak detection and shaping device and method, which comprises a shaping assembly, a plugging assembly, an inflation assembly and an inflation assembly, the shaping assembly comprises a longitudinal shaping and pressing mechanism, a transverse shaping and pressing mechanism and a heat exchange mechanism, the plugging assembly comprises an inner sealing air bag and an outer sealing air bag which are both annular, the inner sealing air bag is used for sealing and abutting against the inner peripheral wall of the bottle nozzle after inflation and pressure expansion, and the outer sealing air bag is used for sealing and abutting against the outer peripheral wall of the bottle nozzle after inflation and pressure expansion; the inflation assembly comprises an inflation head and a gas supply assembly, and the gas supply assembly is used for providing high-pressure gas to the inflation head, the inner sealing air bag and the outer sealing air bag; irreversible deformation caused by the bottle nozzle as a support point in the traditional mode is avoided, two-stage sealing effects are formed, the rapid cooling and shaping of the tank body are realized while the sealing detection is completed, and the production efficiency is effectively improved.

Description

Technical Field

[0001] This invention relates to the technical field of leak testing and shaping of containers, and particularly to a leak testing and shaping device and method for plastic containers. Background Technology

[0002] Plastic containers undergo quality inspection during production to prevent substandard products from entering the market. A crucial step is the sealing test, which detects whether the container leaks air or liquid. Traditional methods typically involve first pressing the bottle opening tightly to seal it, then inflating and pressurizing it, and monitoring whether the internal pressure remains within a preset range to determine if the seal is satisfactory.

[0003] However, the existing air-pressurization leak detection method has the following problems in actual operation:

[0004] Temperature effects and inefficiency: Plastic containers often retain residual heat after blow molding. If they are inflated and pressurized at this time, the container may deform. Usually, they need to be allowed to cool down before testing, which seriously affects production efficiency.

[0005] Bottle neck structure is easily damaged by pressure: Container bottle necks are usually integrally molded with an extended spout for easy installation of caps and pouring of liquids. Traditional pressure-sealing methods lack support for the bottom of the bottle neck, and the plastic material is relatively soft, making the spout prone to tilting and deformation under pressure. This affects the tightness of the seal, reduces the accuracy of testing, and may also cause irreversible structural damage.

[0006] Poor adaptability to dimensional errors: In actual production, there are certain tolerances in the size of the bottle nozzle, while the existing sealing relies on rigid pressure sealing, which is difficult to adaptively compensate for errors and is prone to damage to the bottle nozzle. Summary of the Invention

[0007] The purpose of this invention is to provide a leak detection and shaping device and method for plastic containers, so as to solve one or more technical problems existing in the prior art, and at least provide a beneficial option or create conditions.

[0008] The technical solution adopted to solve the above-mentioned technical problems is as follows:

[0009] This invention provides a leak testing and shaping device for plastic containers, applicable to plastic containers with an extended spout at the top. The leak testing and shaping device for plastic containers includes:

[0010] The shaping assembly includes a longitudinal shaping and pressing mechanism, a transverse shaping and pressing mechanism, and a heat exchange mechanism. The longitudinal shaping and pressing mechanism includes an upper pressing mold, a lower pressing mold, and a longitudinal pressing drive structure. The longitudinal pressing drive structure is used to drive the upper pressing mold and the lower pressing mold to move closer and further apart in the vertical direction to press and abut against the top and bottom of the plastic container. The transverse shaping and pressing mechanism includes at least two transverse molds and a transverse pressing drive structure. The transverse pressing drive structure is used to drive at least two transverse molds to move closer and further apart in the radial direction of the plastic container to press and abut against the outer periphery of the plastic container. The heat exchange mechanism is used to exchange heat with the upper pressing mold, the lower pressing mold, and at least two transverse molds.

[0011] A sealing assembly is provided on the upper pressure mold. The sealing assembly includes an inner sealing airbag and an outer sealing airbag, both of which are annular. The inner sealing airbag is coaxially disposed in the inner ring of the outer sealing airbag, and there is an annular gap between them for fitting with the bottle mouth. The inner sealing airbag is used to inflate and pressurize to seal against the inner peripheral wall of the bottle mouth, and the outer sealing airbag is used to inflate and pressurize to seal against the outer peripheral wall of the bottle mouth.

[0012] An inflation assembly includes an inflation head and an air supply assembly. The inflation head is connected to the interior of the plastic container, and the air supply assembly is used to provide high-pressure gas to the inflation head, the inner sealing airbag, and the outer sealing airbag.

[0013] The detection assembly includes a detection head disposed on the sealing assembly, the detection head being configured to detect the internal air pressure of the plastic container.

[0014] The beneficial effects of the leak detection and shaping device for plastic containers of the present invention are:

[0015] In use, the blow-molded plastic container is first placed in the shaping assembly. The upper and lower molds are then closed to press and abut against the top and bottom of the container. Simultaneously, at least two transverse molds are driven to close, achieving a press and abutment against the outer circumference of the container. Next, the inner sealing airbag is fitted inside the nozzle, and the outer sealing airbag is fitted outside the nozzle. Both are inflated, causing them to expand. The inner sealing airbag forms a seal against the inner wall of the nozzle, and the outer sealing airbag forms a seal against the outer wall of the nozzle, thus sealing the nozzle. At this point, the outer sealing airbag provides radial support to the inner sealing airbag, avoiding irreversible deformation caused by the nozzle acting as a support point in traditional methods, and creating a two-stage sealing effect.

[0016] Meanwhile, the deformable characteristics of the inner and outer sealing airbags can adaptively compensate for the dimensional tolerances of the nozzle, reducing nozzle damage and improving the airtightness of the seal. After the nozzle is sealed, the inflation head and detection head are inserted into the tank. The inflation head injects high-pressure gas from the gas supply assembly into the tank for pressurization, while the detection head monitors the internal pressure in real time to determine if there is any leakage.

[0017] Throughout the pressurization testing process, the heat exchange mechanism exchanges heat with the upper, lower, and transverse molds, rapidly cooling the tank wall. This achieves rapid shaping during inflation and avoids abnormal deformation caused by the combined effect of residual heat and internal pressure within the tank. In summary, this invention achieves rapid cooling and shaping of the tank while simultaneously performing a sealing test, effectively improving production efficiency.

[0018] As a further improvement to the above technical solution, the sealing assembly also includes a sealing seat, the bottom end of which is provided with an annular sealing groove, the inner sealing airbag is disposed on the inner peripheral wall of the sealing groove, and the outer sealing airbag is disposed on the outer peripheral wall of the sealing groove.

[0019] As a further improvement to the above technical solution, the outer sealing airbag is configured to expand radially toward the center after being inflated and pressurized, and the inner sealing airbag is configured to expand radially away from the center after being inflated and pressurized.

[0020] As a further improvement to the above technical solution, the sealing seat is provided with a first air supply channel communicating with the outer sealing airbag, a second air passage communicating with the inner sealing airbag, a third air passage communicating with the inflation head, and a wire channel communicating with the detection head.

[0021] As a further improvement to the above technical solution, the sealing seat is adjustablely installed on the upper pressure mold in the vertical direction to adjust the relative positions of the inner sealing airbag and the outer sealing airbag with the bottle mouth in the vertical direction.

[0022] As a further improvement to the above technical solution, the upper pressure mold is provided with a threaded hole that runs through the upper and lower parts, the sealing seat is cylindrical in shape, the outer peripheral wall of the sealing seat is provided with external threads, the sealing seat is threadedly connected to the threaded hole, and a rotating sleeve is fixedly sleeved on the upper end of the sealing seat.

[0023] As a further improvement to the above technical solution, the upper pressing mold, the lower pressing mold and the transverse mold are all provided with heat exchange channels inside, and the heat exchange mechanism is connected to both ends of the heat exchange channel. The heat exchange mechanism is used to supply heat exchange medium to the heat exchange channel.

[0024] As a further improvement to the above technical solution, the transverse pressing drive structure includes a transverse fixed seat and a transverse movable seat arranged opposite each other in the transverse direction, and a transverse pressing drive component that drives the transverse movable seat to move closer to and away from the transverse fixed seat. Two transverse molds are provided, and the two transverse molds are detachably installed on the transverse fixed seat and the transverse movable seat respectively.

[0025] The longitudinal pressing drive structure includes an upper movable seat and a lower fixed seat arranged opposite each other in the vertical direction, and a longitudinal pressing drive component that drives the upper movable seat to move closer to and away from the lower fixed seat. The upper pressing mold and the lower pressing mold are respectively detachably installed on the upper movable seat and the lower fixed seat.

[0026] As a further improvement to the above technical solution, a clamping platform is provided on the side of the horizontal fixed seat and the horizontal movable seat facing each other.

[0027] The transverse mold includes two template seats arranged at right angles, which are mounted on the clamping platform. The four template seats are arranged in a rectangular shape to form a rectangular structure that hugs the outer periphery of the plastic container. Alternatively, the transverse mold includes an arc-shaped mold base. One end of the arc-shaped mold base is provided with a connecting part that is detachably connected to the clamping platform, and the other end is provided with an arc-shaped groove. The arc-shaped grooves on the two arc-shaped mold bases fit together to form a circular structure that hugs the outer periphery of the plastic container.

[0028] This invention also proposes a method for leak testing and shaping of plastic containers, applicable to the aforementioned leak testing and shaping device for plastic containers, the method comprising:

[0029] The upper and lower pressing molds are controlled to move closer to each other, and at least two of the transverse molds are brought closer together, so as to press and abut against the outside of the plastic container.

[0030] The inner sealing airbag is positioned inside the bottle mouth, and the outer sealing airbag is positioned outside the bottle mouth.

[0031] Control the inflation and expansion of the inner sealing airbag and the outer sealing airbag, so that the inner sealing airbag seals against the inner peripheral wall of the bottle mouth, and the outer sealing airbag seals against the outer peripheral wall of the bottle mouth, thereby blocking the bottle mouth;

[0032] The heat exchange mechanism is controlled to exchange heat with the upper pressure mold, the lower pressure mold and at least two of the transverse molds to cool the plastic container.

[0033] High-pressure gas is injected into the plastic container according to the preset pressure.

[0034] The real-time air pressure inside the plastic container is detected after a preset time period.

[0035] The real-time air pressure is compared with the preset air pressure to obtain the air pressure difference value. If the air pressure difference value is greater than or equal to the preset difference value, it is determined that the plastic container is leaking; otherwise, the plastic container is determined to be qualified.

[0036] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. Attached Figure Description

[0037] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0038] Figure 1 This is a front cross-sectional view of an embodiment of the leak testing and shaping device for plastic containers provided by the present invention.

[0039] Figure 2 This is a top cross-sectional view of an embodiment of a plastic container can with a rectangular cross-section provided by the present invention.

[0040] Figure 3 This is a schematic diagram of an embodiment of the heat exchange mechanism provided by the present invention;

[0041] Figure 4 yes Figure 1 A magnified view of part A in the middle;

[0042] Figure 5 This is a schematic diagram of an embodiment of the gas supply component provided by the present invention;

[0043] Figure 6 This is a top cross-sectional view of an embodiment of a plastic container can with a circular cross-section provided by the present invention.

[0044] Figure 7 This is a flowchart of an embodiment of the leak testing and shaping method for plastic containers provided by the present invention;

[0045] Icon labels:

[0046] Plastic container 100; bottle spout 110;

[0047] Sealing assembly 200; inner sealing airbag 210; outer sealing airbag 220; annular gap 230; sealing seat 240; sealing groove 241; rotating sleeve 242; first air supply channel 243; second air passage 244; third air passage 245; wire channel 246; air nozzle 247;

[0048] Longitudinal shaping and pressing mechanism 300; upper pressing die 310; screw hole 311; lower pressing die 320; upper movable seat 330; lower fixed seat 340; longitudinal pressing drive component 350; frame 360; longitudinal guide rod 370;

[0049] Transverse shaping and pressing mechanism 400; transverse mold 410; template base 411; arc mold base 412; connecting part 4121; arc groove 4122; transverse fixed base 420; transverse movable base 430; transverse pressing drive component 440; transverse guide rod 450; fixed frame 460; clamping table 470.

[0050] Heat exchange mechanism 500; heat exchange channel 510; heat exchanger 520; water pump 530; water flow control valve 540;

[0051] Inflation head 600; air supply assembly 610; high-pressure air pump 611; air tank 612; first control valve 613; second control valve 614; third control valve 615; pressure relief valve 616; fourth control valve 617; fifth control valve 618;

[0052] Detection head 700. Detailed Implementation

[0053] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0054] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the drawings and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0055] In the description of this invention, "multiple" refers to two or more. The use of "first" and "second" is for distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features or their sequential relationship.

[0056] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0057] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are some embodiments of the present invention, not all embodiments.

[0058] Reference Figures 1-6 The leak detection and shaping device for plastic containers of the present invention is provided in the following embodiments:

[0059] The leak testing and shaping device for plastic containers of the present invention is applicable to plastic containers 100 with an extended nozzle 110 on the top. It can be understood that the nozzle 110 protrudes upward from the top of the plastic container 100.

[0060] The plastic container leak detection and shaping device of the present invention includes a shaping component, a sealing component 200, an inflation component, and a detection component.

[0061] like Figure 1 As shown, the shaping component is used to support and shape the plastic container 100. Specifically, the shaping component of the present invention includes a longitudinal shaping and pressing mechanism 300, a transverse shaping and pressing mechanism 400, and a heat exchange mechanism 500.

[0062] like Figure 1 As shown, the longitudinal shaping and pressing mechanism 300 of this embodiment includes an upper pressing mold 310, a lower pressing mold 320, and a longitudinal pressing drive structure. The upper pressing mold 310 and the lower pressing mold 320 are arranged opposite each other at a distance in the vertical direction. The shapes of the upper pressing mold 310 and the lower pressing mold 320 need to match the shapes of the top and bottom of the plastic container 100 so that they can fit together in contact. The longitudinal pressing drive structure is used to drive the upper pressing mold 310 and the lower pressing mold 320 to move closer and further apart in the vertical direction to press and abut against the top and bottom of the plastic container 100.

[0063] like Figure 2 As shown, the transverse shaping and pressing mechanism 400 of this embodiment includes at least two transverse molds 410 and a transverse pressing drive structure. The at least two transverse molds 410 are arranged at intervals along the circumference. The shape of the transverse molds 410 also needs to match the shape of the outer periphery of the plastic container 100 so that they can match and abut against each other. The transverse pressing drive structure is used to drive the at least two transverse molds 410 to move closer and further away from each other along the radial direction of the plastic container 100 so as to press and abut against the outer periphery of the plastic container 100.

[0064] It is understandable that, such as Figure 1 As shown, in this embodiment, the outer side of the plastic container 100 is wrapped by the mutual closing of the upper pressing mold 310, the lower pressing mold 320 and at least two transverse molds 410.

[0065] The heat exchange mechanism 500 is used to exchange heat with the upper pressing mold 310, the lower pressing mold 320 and at least two transverse molds 410. The heat of the plastic container 100 can be transferred to the heat exchange mechanism 500 through the upper pressing mold 310, the lower pressing mold 320 and at least two transverse molds 410 to cool the plastic container 100.

[0066] like Figure 1 and Figure 2 As shown, in this embodiment, the upper pressing mold 310, the lower pressing mold 320, and the transverse mold 410 are all provided with heat exchange channels 510. A heat exchange mechanism 500 is connected to both ends of the heat exchange channels 510. The heat exchange mechanism 500 is used to circulate and supply heat exchange medium to the heat exchange channels 510. The heat exchange medium can be gas or liquid; specifically, this embodiment uses water cooling. Figure 3 As shown, the heat exchange mechanism 500 includes a heat exchanger 520 and a water pump 530 connected in sequence. The outlet of the water pump 530 is connected to the inlet end of each heat exchange channel 510 through a water flow control valve 540, and the outlet end of each heat exchange channel 510 is connected to the inlet of the heat exchanger 520. In order to improve the cooling effect, the heat exchange channels 510 are arranged in a serpentine pattern.

[0067] like Figure 1 and Figure 4 As shown, the sealing component 200 of this embodiment is disposed on the upper pressure mold 310. The sealing component 200 includes an inner sealing airbag 210 and an outer sealing airbag 220, both of which are annular. The axes of the inner sealing airbag 210 and the outer sealing airbag 220 are both arranged to extend vertically. The inner sealing airbag 210 is coaxially disposed in the inner ring of the outer sealing airbag 220, and an annular gap 230 is provided between the two for fitting with the bottle mouth 110.

[0068] In this embodiment, the inner sealing airbag 210 is used to inflate and pressurize, and then seal against the inner peripheral wall of the bottle mouth 110. The outer sealing airbag 220 is used to inflate and pressurize, and then seal against the outer peripheral wall of the bottle mouth 110. During use, the annular gap 230 is controlled to be vertically opposite to the bottle mouth 110. When the upper pressing mold 310 presses down, it drives the inner sealing airbag 210 and the outer sealing airbag 220 to move downward together. At this time, the inner sealing airbag 210 and the outer sealing airbag... When nozzle 110 is not inflated and is in a contracted state, the annular gap 230 is relatively wide, allowing nozzle 110 to easily fit into it. Then, the inner sealing bladder 210 and outer sealing bladder 220 are inflated and pressurized. At this time, the inner sealing bladder 210 and outer sealing bladder 220 clamp nozzle 110 radially from both inside and outside, thus clamping nozzle 110 between them and forming a two-stage seal. Furthermore, axially, the inner sealing bladder 210 and outer sealing bladder 220 are in the same position, providing support to nozzle 110 from both inside and outside. This avoids irreversible deformation caused by nozzle 110 acting as a support point in traditional methods. Simultaneously, the deformable characteristics of the inner sealing bladder 210 and outer sealing bladder 220 can adaptively compensate for the dimensional tolerances of nozzle 110, reducing damage to nozzle 110 and improving the airtightness of the seal.

[0069] like Figure 4 and Figure 5 As shown, the inflation assembly of this embodiment includes an inflation head 600 and an air supply assembly 610. The inflation head 600 is disposed on the sealing assembly 200. When the inner sealing airbag 210 and the outer sealing airbag 220 seal the bottle mouth 110, the inflation head 600 communicates with the interior of the plastic container 100. The air supply assembly 610 is used to provide high-pressure gas to the inflation head 600, the inner sealing airbag 210 and the outer sealing airbag 220.

[0070] The detection component of this embodiment includes a detection head 700 disposed on the sealing component 200, and the detection head 700 is configured to detect the internal air pressure of the plastic container 100.

[0071] After the nozzle 110 is sealed, the inflation head 600 and the detection head 700 are inserted into the tank. The inflation head 600 injects the high-pressure gas provided by the gas supply component 610 into the tank for pressurization, while the detection head 700 monitors the internal air pressure in real time to determine whether there is a leak.

[0072] The test air pressure provided by the air supply component 610 to the inflation head 600 is different from the sealing expansion air pressure of the inner sealing airbag 210 and the outer sealing airbag 220. Generally, the sealing expansion air pressure is greater than the test air pressure, so as to avoid damage to the seal of the bottle mouth 110 during inflation and leak testing.

[0073] Specifically, such as Figure 5 As shown, the air supply assembly 610 in this embodiment includes a high-pressure air pump 611 and an air storage tank 612. The outlet of the high-pressure air pump 611 and the opening of the air storage tank 612 are connected to the inflation head 600, the inner sealing airbag 210 and the outer sealing airbag 220 through a multi-port pipe. The outlet of the high-pressure air pump 611 is provided with a first control valve 613, while the opening of the air storage tank 612 is provided with a second control valve 614. The inflation head 600 is provided with a third control valve 615 and a pressure relief valve 616. The inner sealing airbag 210 is provided with a fourth control valve 617 and the outer sealing airbag 220 is provided with a fifth control valve 618.

[0074] Among them, the high-pressure air pump 611 is used to provide high-pressure gas, the air storage tank 612 is used to store high-pressure gas, the third control valve 615 is used to control the air pressure of the inflation head 600, the pressure relief valve 616 is used to relieve pressure inside the plastic container 100, the fourth control valve 617 is used to control the air pressure of the inner sealing airbag 210, and the fifth control valve 618 is used to control the air pressure of the outer sealing airbag 220.

[0075] Furthermore, such as Figure 4 As shown, the sealing assembly 200 of this embodiment also includes a sealing seat 240. The bottom end of the sealing seat 240 is provided with an annular sealing groove 241. The inner sealing airbag 210 is disposed on the inner peripheral wall of the sealing groove 241, and the outer sealing airbag 220 is disposed on the outer peripheral wall of the sealing groove 241. In this embodiment, the outer sealing airbag 220 is configured to expand radially toward the center after being inflated and pressurized, and the inner sealing airbag 210 is configured to expand radially away from the center after being inflated and pressurized.

[0076] The sealing seat 240 is installed on the upper pressure mold 310, and the sealing seat 240 is adjustablely installed on the upper pressure mold 310 in the vertical direction to adjust the relative position of the inner sealing airbag 210 and the outer sealing airbag 220 with the bottle mouth 110 in the vertical direction. It can be understood that if the height of the bottle mouth 110 is low, the inner sealing airbag 210 and the outer sealing airbag 220 will not be able to contact the bottle mouth 110 when the upper pressure mold 310 abuts against the top of the plastic container 100. At this time, the position of the sealing seat 240 needs to be adjusted downward to adjust the relative position of the inner sealing airbag 210 and the outer sealing airbag 220 with respect to the upper pressure mold 310 in the vertical direction, so that the inner sealing airbag 210 and the outer sealing airbag 220 can fit on the bottle mouth 110, thereby adapting to bottle mouths 110 of different heights and improving the adaptability of the device.

[0077] like Figure 4As shown, the upper pressure mold 310 of this embodiment is provided with a threaded hole 311 that runs vertically through the upper and lower parts. The sealing seat 240 has a cylindrical shape and an external thread on its outer peripheral wall. The sealing seat 240 is threadedly connected to the threaded hole 311. A rotating sleeve 242 is fixedly sleeved on the upper end of the sealing seat 240. When it is necessary to adjust the vertical position of the inner sealing airbag 210 and the outer sealing airbag 220, the sealing seat 240 is rotated by rotating the rotating sleeve 242 to drive the sealing seat 240 to adjust vertically. The threaded connection of the threaded hole 311 of the sealing seat 240 enables self-locking.

[0078] like Figure 4 As shown, the sealing seat 240 of this embodiment has a first air supply channel 243 communicating with the outer sealing airbag 220, a second ventilation channel 244 communicating with the inner sealing airbag 210, a third ventilation channel 245 communicating with the inflation head 600, and a wire channel 246 communicating with the detection head 700. In this embodiment, the inflation head 600 and the detection head 700 are both located at the bottom end of the sealing seat 240. The upper end of the sealing seat 240 is provided with three air nozzles 247. The three air nozzles 247 are respectively connected to the first air supply channel 243, the second ventilation channel 244 and the third ventilation channel 245. The air nozzles 247 are used to connect to the air supply assembly 610.

[0079] like Figure 2 As shown, the transverse pressing drive structure of this embodiment includes a transverse fixed seat 420 and a transverse movable seat 430 arranged opposite to each other, and a transverse pressing drive member 440 that drives the transverse movable seat 430 to move closer to and away from the transverse fixed seat 420. Specifically, the transverse movable seat 430 and the transverse fixed seat 420 are arranged at intervals relative to each other in the left-right direction. The transverse fixed seat 420 is connected to a plurality of transverse guide rods 450 extending in the left-right direction. A fixing frame 460 is provided at one end of the plurality of transverse guide rods 450 away from the transverse fixed seat 420. The transverse movable seat 430 is slidably engaged with the plurality of transverse guide rods 450. The transverse pressing drive member 440 is mounted on the fixing frame 460. The transverse pressing drive member 440 adopts a linear drive structure such as a cylinder or a hydraulic cylinder.

[0080] In this embodiment, two transverse molds 410 are provided. The two transverse molds 410 are detachably installed on the transverse fixed base 420 and the transverse movable base 430, respectively. The transverse fixed base 420 and the transverse movable base 430 are provided with clamping tables 470 on their respective facing sides. Different transverse molds 410 can be replaced according to different specifications and models of plastic container 100. In this invention, two transverse molds 410 are proposed to adapt to plastic container 100 with a circular cross-section and plastic container 100 with a rectangular cross-section, respectively.

[0081] like Figure 2As shown, for a plastic container 100 with a rectangular cross-section, the transverse mold 410 includes two template seats 411 arranged at right angles. The two template seats 411 are installed on the clamping table 470, and the four template seats 411 are distributed in a rectangular shape to form a rectangular structure that hugs the outer peripheral wall of the plastic container 100.

[0082] like Figure 6 As shown, for a plastic container 100 with a circular cross-section, the transverse mold 410 includes an arc-shaped mold base 412. One end of the arc-shaped mold base 412 is provided with a connecting part 4121 that is detachably connected to the clamping table 470, and the other end is provided with an arc-shaped groove 4122. The arc-shaped grooves 4122 on the two arc-shaped mold bases 412 fit together to form a circular structure that hugs the outer peripheral wall of the plastic container 100.

[0083] like Figure 1 As shown, the longitudinal pressing drive structure of this embodiment includes an upper movable seat 330 and a lower fixed seat 340 arranged opposite each other in the vertical direction, and a longitudinal pressing drive component 350 that drives the upper movable seat 330 to move closer to and away from the lower fixed seat 340. The upper pressing mold 310 and the lower pressing mold 320 are detachably installed on the upper movable seat 330 and the lower fixed seat 340, respectively. In this embodiment, the upper movable seat 330 is connected to a plurality of longitudinal guide rods 370 extending in the vertical direction. The longitudinal pressing drive component 350 is installed on the frame 360, and the plurality of longitudinal guide rods 370 slide vertically with the frame 360. The longitudinal pressing drive component 350 adopts a linear drive structure such as a cylinder or a hydraulic cylinder.

[0084] This invention also proposes a method for leak testing and shaping of plastic containers, applicable to the aforementioned leak testing and shaping device for plastic containers, such as... Figure 7 As shown, the leak detection and shaping methods for plastic containers and cans include:

[0085] Step S100: Control the upper pressing mold 310 and the lower pressing mold 320 to move closer to each other, and at least two transverse molds 410 to move closer to each other, so as to press and abut against the outside of the plastic container 100.

[0086] Step S200: Control the inner sealing airbag 210 to be fitted inside the bottle mouth 110, and the outer sealing airbag 220 to be fitted outside the bottle mouth 110;

[0087] Step S300: Control the inflation and expansion of the inner sealing airbag 210 and the outer sealing airbag 220, so that the inner sealing airbag 210 seals against the inner peripheral wall of the bottle mouth 110, and the outer sealing airbag 220 seals against the outer peripheral wall of the bottle mouth 110, thereby sealing the bottle mouth 110.

[0088] Step S400: Control the heat exchange mechanism 500 to exchange heat with the upper pressing mold 310, the lower pressing mold 320 and at least two transverse molds 410 to cool the plastic container 100.

[0089] Step S500: Fill the plastic container 100 with high-pressure gas according to the preset pressure;

[0090] Step S600: After a preset time period, detect the real-time air pressure inside the plastic container 100;

[0091] Step S700: The real-time air pressure is compared with the preset air pressure to obtain the air pressure difference value. If the air pressure difference value is greater than or equal to the preset difference value, it is determined that the plastic container 100 is leaking air; otherwise, it is determined that the plastic container 100 is qualified.

[0092] In step S100, the plastic container 100 to be tested is first placed vertically on the lower pressing mold 320. The transverse pressing drive component 440 is controlled to drive the transverse movable seat 430 closer to the transverse fixed seat 420, so as to drive the two transverse molds 410 to move closer together. At the same time, the longitudinal pressing drive component 350 is controlled to drive the upper movable seat 330 closer to the lower fixed seat 340, so as to drive the upper pressing mold 310 and the lower pressing mold 320 closer to each other, thus wrapping the outer side of the plastic container 100.

[0093] In step S200, when the longitudinal pressing drive member 350 drives the upper movable seat 330 to approach the lower fixed seat 340, the sealing seat 240 is rotated by the rotating sleeve 242 according to the height of the bottle mouth 110, so as to drive the sealing seat 240 to adjust up and down, so that the inner sealing airbag 210 and the outer sealing airbag 220 can be fitted onto the bottle mouth 110.

[0094] In step S300, according to the set air pressure, the air supply component 610 is controlled to provide high-pressure gas to the inner sealing airbag 210 and the outer sealing airbag 220, so that the outer sealing airbag 220 is inflated and pressurized and expands radially toward the center and seals against the outer peripheral wall of the bottle mouth 110, and the inner sealing airbag 210 is inflated and pressurized and expands radially away from the center and seals against the inner peripheral wall of the bottle mouth 110.

[0095] In step S400, the heat exchange mechanism 500 is controlled to provide circulating cooling water to each heat exchange channel 510. Steps S400 and S500 can be executed simultaneously.

[0096] In step S500, the control air supply component 610 supplies high-pressure gas to the air inflation head 600, so that the plastic container 100 is inflated and pressurized to the set pressure.

[0097] In step S600, the real-time air pressure inside the plastic container 100 is monitored in real time by the detection head 700.

[0098] Throughout the pressurization and testing process, this invention utilizes a heat exchange mechanism 500 to exchange heat with the upper pressure mold 310, lower pressure mold 320, and transverse mold 410, rapidly cooling the tank wall. This achieves rapid shaping during inflation and avoids abnormal deformation caused by the combined effect of residual heat and internal pressure within the tank. Furthermore, the inflation and expansion of the inner sealing airbag 210 and the outer sealing airbag 220 seal the nozzle 110, creating a two-stage sealing effect. This avoids irreversible deformation caused by the nozzle 110 acting as a support point in traditional methods and adaptively compensates for dimensional tolerances of the nozzle 110, reducing damage to the nozzle 110 and improving the airtightness of the seal.

[0099] In summary, this invention achieves rapid cooling and shaping of the tank while completing the sealing test, effectively improving production efficiency.

[0100] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0101] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A leak-testing and shaping device for plastic containers, characterized in that, A leak detection and shaping device for plastic containers with an extended spout at the top, comprising: A shaping assembly includes a longitudinal shaping and pressing mechanism, a transverse shaping and pressing mechanism, and a heat exchange mechanism. The longitudinal shaping and pressing mechanism includes an upper pressing mold, a lower pressing mold, and a longitudinal pressing drive structure. The longitudinal pressing drive structure is used to drive the upper pressing mold and the lower pressing mold to move closer to each other and further apart in the vertical direction. The transverse shaping and pressing mechanism includes at least two transverse molds and a transverse pressing drive structure. The transverse pressing drive structure is used to drive at least two transverse molds to move closer to each other and further apart in the radial direction of the plastic container. The heat exchange mechanism is used to exchange heat with the upper pressing mold, the lower pressing mold, and at least two transverse molds. A sealing assembly is provided on the upper pressure mold. The sealing assembly includes an inner sealing airbag and an outer sealing airbag, both of which are annular. The inner sealing airbag is coaxially disposed in the inner ring of the outer sealing airbag, and there is an annular gap between them for fitting with the bottle mouth. The inner sealing airbag is used to inflate and pressurize to seal against the inner peripheral wall of the bottle mouth, and the outer sealing airbag is used to inflate and pressurize to seal against the outer peripheral wall of the bottle mouth. An inflation assembly includes an inflation head and an air supply assembly. The inflation head is connected to the interior of the plastic container, and the air supply assembly is used to provide high-pressure gas to the inflation head, the inner sealing airbag, and the outer sealing airbag. The detection assembly includes a detection head disposed on the sealing assembly, the detection head being configured to detect the internal air pressure of the plastic container. The sealing assembly further includes a sealing seat, the bottom end of which is provided with an annular sealing groove, the inner sealing airbag is disposed on the inner peripheral wall of the sealing groove, and the outer sealing airbag is disposed on the outer peripheral wall of the sealing groove; The outer sealing airbag is configured to expand radially toward the center after inflation and pressurization, and the inner sealing airbag is configured to expand radially away from the center after inflation and pressurization. The upper pressing mold, the lower pressing mold, and the transverse mold are all provided with heat exchange channels inside. The heat exchange mechanism is connected to both ends of the heat exchange channels and is used to supply heat exchange medium to the heat exchange channels.

2. The leak detection and shaping device for plastic containers and cans according to claim 1, characterized in that: The sealing seat has a first ventilation channel communicating with the outer sealing airbag, a second ventilation channel communicating with the inner sealing airbag, a third ventilation channel communicating with the inflation head, and a wire channel communicating with the detection head.

3. The leak detection and shaping device for plastic containers and cans according to claim 1, characterized in that: The sealing seat is adjustablely mounted on the upper pressure mold in the vertical direction to adjust the relative positions of the inner sealing airbag and the outer sealing airbag with the bottle mouth in the vertical direction.

4. The leak detection and shaping device for plastic containers and cans according to claim 3, characterized in that: The upper pressure mold is provided with a threaded hole that runs through the top and bottom. The sealing seat is cylindrical in shape. The outer peripheral wall of the sealing seat is provided with external threads. The sealing seat is threadedly connected to the threaded hole. A rotating sleeve is fixedly fitted on the upper end of the sealing seat.

5. The leak detection and shaping device for plastic containers and cans according to claim 1, characterized in that: The transverse pressing drive structure includes a transverse fixed seat and a transverse movable seat arranged opposite each other in the transverse direction, and a transverse pressing drive component that drives the transverse movable seat to move closer to and away from the transverse fixed seat. Two transverse molds are provided, and the two transverse molds are detachably installed on the transverse fixed seat and the transverse movable seat, respectively. The longitudinal pressing drive structure includes an upper movable seat and a lower fixed seat arranged opposite each other in the vertical direction, and a longitudinal pressing drive component that drives the upper movable seat to move closer to and away from the lower fixed seat. The upper pressing mold and the lower pressing mold are respectively detachably installed on the upper movable seat and the lower fixed seat.

6. The leak detection and shaping device for plastic containers and cans according to claim 5, characterized in that: Both the lateral fixed seat and the lateral movable seat have a clamping platform on their opposite sides; The transverse mold includes two template seats arranged at right angles, which are mounted on the clamping platform. The four template seats are arranged in a rectangular pattern to form a rectangular structure that hugs the outer periphery of the plastic container. Alternatively, the transverse mold includes an arc-shaped mold base. One end of the arc-shaped mold base is provided with a connecting part that is detachably connected to the clamping platform, and the other end is provided with an arc-shaped groove. The arc-shaped grooves on the two arc-shaped mold bases fit together to form a circular structure that hugs the outer periphery of the plastic container.

7. A method for leak testing and shape determination of plastic containers, characterized in that, The method for leak testing and shaping of plastic containers and cans, applicable to any one of claims 1 to 6, includes: The upper and lower pressing molds are controlled to move closer to each other, and at least two of the transverse molds are brought closer together, so as to press and abut against the outside of the plastic container. The inner sealing airbag is positioned inside the bottle mouth, and the outer sealing airbag is positioned outside the bottle mouth. Control the inflation and expansion of the inner sealing airbag and the outer sealing airbag, so that the inner sealing airbag seals against the inner peripheral wall of the bottle mouth, and the outer sealing airbag seals against the outer peripheral wall of the bottle mouth, thereby blocking the bottle mouth; The heat exchange mechanism is controlled to exchange heat with the upper pressure mold, the lower pressure mold and at least two of the transverse molds to cool the plastic container. High-pressure gas is injected into the plastic container according to the preset pressure. The real-time air pressure inside the plastic container is detected after a preset time period. The real-time air pressure is compared with the preset air pressure to obtain the air pressure difference value. If the air pressure difference value is greater than or equal to the preset difference value, it is determined that the plastic container is leaking; otherwise, the plastic container is determined to be qualified.

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