A bottle cap online air tightness detection device and detection method

Abstract

The application discloses a kind of bottle cap online air tightness detection device and detection method, it is related to air tightness detection technical field, including pedestal, bottle cap butt joint component, sealing assembly and bottle cap control component, the surface middle position of the pedestal is equipped with connecting groove, the outside of the pedestal is fixedly connected with pressure detection table, and the detection end of pressure detection table penetrates pedestal and extends to the inside of connecting groove, for detecting the pressure change in connecting groove interior to judge the sealing property of bottle cap.The sleeve of the application is set to realize the compatible detection of multi-specification bottle cap by the butt joint head of bottle cap butt joint component, and the mold is changed, the sealing assembly is adapted to block the expansion gap of butt joint head by air bag, to ensure that detection cavity is absolutely sealed, to improve accuracy, to realize bottle cap automatic clamping and accurate screwing down by bottle cap control component, to simulate assembly stress, to ensure detection specification and to reduce artificial strength.

Description

Technical Field

[0001] This invention relates to the field of airtightness testing technology, specifically to an online airtightness testing device and method for bottle caps. Background Technology

[0002] With the rapid development of the packaging industry, bottle caps, as key sealing components of bottle packaging, directly affect the shelf life and safety of food, pharmaceuticals, cosmetics, and other products. Currently, bottle cap airtightness testing primarily employs positive or negative pressure methods. This involves filling the sealed cavity with air or creating a vacuum, and then using pressure sensors or observing bubbles underwater to determine if the cap is leaking. Related testing equipment is widely used in production line quality control. During online testing, bottle caps are typically transported to the testing station by a conveyor belt. A sealing testing cavity is then formed by the positioning seat, pressure head, and air nozzle. The airtightness tester pressurizes the cavity, and the sealing performance is evaluated by monitoring pressure changes or observing bubbles. This approach has, to some extent, automated bottle cap airtightness testing, improving testing efficiency and consistency.

[0003] However, existing online bottle cap airtightness testing devices are designed for single-specification bottle caps with fixed connector sizes, making it impossible to quickly switch between bottle caps of different diameters and thread specifications. When product specifications change, manual replacement of the mating module or adjustment of the equipment is required, which increases changeover time and reduces production line flexibility and testing efficiency. In multi-specification nested connector structures, when the inner connector extends to fit a small-diameter bottle cap, an annular gap is generated between the connectors. Existing sealing methods mostly rely on end face gaskets or static sealing rings, which are difficult to reliably seal radial gaps generated during dynamic expansion and contraction. This can easily form micro-leakage channels in the testing chamber, leading to misjudgments of pressure attenuation and affecting testing accuracy and reliability. Secondly, the tightening process of the bottle cap is difficult to accurately simulate the actual sealing torque and tightening angle, resulting in a difference between the testing state and the actual filling and sealing state. This reduces the ability of the test results to characterize the actual sealing performance. At the same time, sequential testing at a single station also restricts the improvement of the overall testing cycle and production capacity. Summary of the Invention

[0004] Technical problems to be solved The purpose of this invention is to overcome the shortcomings of existing online bottle cap airtightness testing devices in terms of multi-specification compatibility switching, reliability of dynamic gap sealing of the fitting joint, and accuracy of simulating the actual tightening state of the bottle cap. Technical solution

[0005] To achieve the above objectives, the present invention provides the following technical solution: an online airtightness detection device for bottle caps, comprising: A base, with a connecting groove in the middle of its surface, and a pressure gauge fixedly connected to the outside of the base, with the measuring end of the pressure gauge penetrating the base and extending into the interior of the connecting groove, used to detect pressure changes inside the connecting groove to determine the sealing performance of the bottle cap. A bottle cap docking assembly is fixedly connected to the surface of the base and is located directly above the connecting groove. The interior of the bottle cap docking assembly and the connecting groove form an airtightness detection chamber. A sealing assembly is fixedly connected to the inner side of the bottle cap docking assembly, and the other end of the sealing assembly passes through the connecting groove and extends to the bottom of the base, for sealing the gap at the connection of the bottle cap docking assembly. A bottle cap control assembly is located directly above the bottle cap docking assembly. It is used to clamp the bottle cap and rotate it to the top of the bottle cap docking assembly for sealing detection. A support frame is fixedly connected to the outside of the bottle cap control assembly, and the bottom of the support frame is fixedly connected to the outside of the base.

[0006] Furthermore, the bottle cap docking assembly includes: Three connectors are interlocked, and each connector has a threaded connection on its outer side for mating with bottle caps of different diameters. The sliders are fixedly connected in a ring array to the bottom of the two inner connectors, and the sliders are T-shaped. Among them, several sliding grooves are opened on the inner side of the two outer joints, and the sliding grooves are adapted to the sliding strips, and the sliding strips are slidably connected to the inside of the sliding grooves.

[0007] Furthermore, the bottom of the base is fixedly connected to two symmetrically arranged external pipes, and the other end of the external pipes penetrates the base and extends into the interior of the connecting groove, for use as an external boosting device to boost and deliver pressure into the interior of the connecting groove.

[0008] Furthermore, the sealing assembly includes: A miniature air pump, which is fixedly connected to the bottom of the base; The diverter pipe is fixedly connected to the bottom of the connecting groove, and the output end of the micro air pump is connected to the bottom of the diverter pipe through a pipe passing through the base. The diverter tube is designed to be foldable and telescopic, and is used to follow the extension and retraction movement of the connector. Two sets of delivery tubes arranged in a ring array are fixedly connected to the outside of the diverter tube, and a passage is formed inside the delivery tube, the diverter tube and the output end of the micro air pump.

[0009] Furthermore, the sealing assembly also includes: The fixing ring is fixedly connected to the bottom of the two inner joints respectively, and the outer side of the fixing ring is provided with a mating groove; The sealing airbags are fixedly connected to the inside of the docking grooves to seal the gap between the bottoms of the two docking joints. The end of the delivery pipe away from the diversion pipe passes through the fixing ring and is fixedly connected and communicates with the sealing airbags.

[0010] Furthermore, each of the fixed rings is fixedly connected to a first electric telescopic rod, and the bottom of the first electric telescopic rod is fixedly connected to the bottom of the connecting groove, for pushing out the corresponding connector to mate the bottle cap.

[0011] Furthermore, the bottle cap control assembly includes: A control shaft, on the outer side of which are two symmetrically arranged limiting strips are fixedly connected; A drive motor is fixedly connected to the top of the support frame, and the output end of the drive motor passes through the support frame and is fixedly connected to the top of the control shaft for driving the control shaft to rotate. A connecting rod has a mounting hole at its top end, and the cross-section of the mounting hole is adapted to the connecting cross-section of the control shaft and the limiting strip. The control shaft is slidably connected to the inside of the mounting hole through the limiting strip. The bottom of the mounting hole is fixedly connected to an electric telescopic rod two, and the telescopic end of the electric telescopic rod two is fixedly connected to the bottom of the control shaft, so as to drive the connecting rod to rotate while extending and retracting relative to each other.

[0012] Furthermore, the bottle cap control assembly also includes: A base, which is fixedly connected to the bottom of the connecting rod; The slide rod has four rods that are evenly and fixedly connected to the outside of the base; The clamping strips are slidably connected to the outside of the slide bar, and the bottom of the clamping strips is arc-shaped. The inner side of the clamping strips is provided with anti-slip grooves for clamping bottle caps. A sliding ring, which is sleeved on the outside of the connecting rod; An electric push rod is fixedly connected to the surface of the base, and the telescopic end of the electric push rod is fixedly connected to the bottom of the sliding ring.

[0013] Furthermore, a return spring is fixedly connected to the bottom of the sliding ring, and the return spring is sleeved on the outside of the connecting rod. A transmission bar is movably connected to the outside of the sliding ring through a rotating shaft, and the other end of the transmission bar is movably connected to the top of the clamping bar through a rotating shaft, which is used to convert the up and down movement of the sliding ring into clamping and expanding of the clamping bar.

[0014] A method for online airtightness testing of bottle caps includes the following steps: S1. When the bottle cap is delivered to the inspection station, the bottle cap control component starts to operate. The electric push rod fixedly connected to the base surface retracts, driving the sliding ring to slide upward along the outside of the connecting rod. At the same time, the reset spring applies a reaction force to the sliding ring. The upward movement of the sliding ring pulls the transmission bar through the rotating shaft, causing the clamping bar to converge towards the center along the slide rod, using its inner anti-slip groove to firmly clamp the bottle cap. S2. After the clamping is stable, the drive motor fixedly connected to the top of the support frame starts and drives the control shaft to rotate. Since the limit strip on the outside of the control shaft is compatible with the cross section of the mounting hole at the top of the connecting rod, the control shaft drives the connecting rod and the clamped bottle cap to rotate synchronously. At the same time, the electric telescopic rod inside the mounting hole extends out and drives the connecting rod to move downward relative to the control shaft, thereby realizing the rotation and pressing action of the bottle cap. S3. At the same time, according to the diameter of the bottle cap, the corresponding electric telescopic rod extends and pushes the fixing ring and the inner connector connected to it to move upward. The T-shaped slide bar on the outside of the connector slides along the slide groove on the inside of the outer connector, so that the target connector extends out and its outer mating thread precisely screws into the bottle cap that is rotated and pressed down, thereby forming a sealed airtightness detection chamber directly above the connecting groove. S4. Since the three connectors are interlocked, when the inner connector extends, a gap will be created between it and the outer connector. At this time, the miniature air pump fixed to the bottom of the base starts, and the output gas passes through the pipe, the diversion pipe inside the connecting groove and the delivery pipe in sequence. Since the diversion pipe is foldable and telescopic, it can adapt to the length change with the extension and retraction of the connector. The gas finally enters the sealing airbag fixed to the outer docking groove of the fixing ring, causing it to expand and completely seal the gap between the bottom of the inner connector and the outer connector, ensuring the absolute sealing of the airtightness test chamber. S5. After the test chamber is sealed, the external pressurization device injects high-pressure gas into the connecting groove of the base through two external pipes. The gas enters the sealed test chamber composed of the bottle cap, the connector and the connecting groove. At this time, observe the pressure gauge fixedly connected to the outside of the base. If the pressure in the sealed chamber remains stable, it means that the bottle cap is sealed. If the pressure value drops, it means that the bottle cap is leaking and the sealing is not qualified. S6. After the test is completed, the miniature air pump draws air to cause the sealing airbag to contract and reset, the external pipe is depressurized, the electric telescopic rod retracts, driving the connector to retract to its original position, then the electric push rod extends, the sliding ring moves down, compresses the reset spring, and pushes the clamping strip outward along the slide bar through the transmission bar, releasing the bottle cap and completing a single airtightness test cycle.

[0015] Compared with existing technologies, this online bottle cap airtightness testing device and method have the following advantages: I. This invention, through the design of a bottle cap docking assembly, utilizes three interlocking connectors in conjunction with a T-shaped slide bar and a slide groove. Under the push of an electric telescopic rod, the corresponding inner connector can be precisely pushed out and docked according to the diameter of the bottle cap to be tested. This enables a single device to perform compatibility testing of bottle caps of different specifications without the need for frequent changes of tooling molds, significantly improving the applicability, versatility, and online testing efficiency of the equipment.

[0016] II. This invention utilizes a sealing component, a miniature air pump, a foldable and telescopic diverter tube, and a sealing airbag. When the inner connector extends and creates a gap, the diverter tube adaptively follows the telescopic movement. Gas enters the sealing airbag through the delivery tube, causing it to expand and completely seal the gap between the bottoms of the inner and outer connectors. This effectively solves the problem of air leakage gaps that easily occur when multi-specification mating connectors are telescopically adjusted, ensuring the absolute sealing of the airtightness testing chamber and thus significantly improving the accuracy and reliability of the test results.

[0017] Third, this invention utilizes a bottle cap control component, employing a drive motor and a limiting strip to rotate the connecting rod and bottle cap. Combined with an electric telescopic rod, it achieves a rotating and pressing engagement action. Simultaneously, an electric push rod drives a sliding ring, which, in conjunction with a transmission strip, converts linear motion into the clamping and releasing of the clamping strip. This achieves automated, stable clamping and precise engagement of the bottle cap, fully simulating the actual assembly stress state of the bottle cap, further ensuring the standardization of airtightness testing. Furthermore, the fully automated process significantly reduces the intensity of manual operation.

[0018] Other advantages, objectives and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination or study, or may be learned from the practice of the invention. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the three-dimensional connection structure of the present invention; Figure 2 This is a schematic diagram of the bottom-view three-dimensional connection structure of the present invention; Figure 3 This is a schematic diagram of the connecting groove connection structure of the present invention; Figure 4 This is a schematic diagram of the connection structure of the bottle cap docking assembly of the present invention.

[0020] Figure 5 This is a schematic diagram of the sealing assembly connection structure of the present invention; Figure 6 This is a schematic diagram of the connection structure of the bottle cap control assembly of the present invention; Figure 7 This is a partial cross-sectional view of the connecting rod connection structure of the present invention; Figure 8 This is a schematic diagram of the control shaft connection structure of the present invention.

[0021] Figure 9 For the present invention Figure 4 Enlarged connection structure diagram at point A; Figure 10 For the present invention Figure 5 Enlarged connection structure diagram at point A.

[0022] In the diagram: 1. Base; 2. Connecting groove; 3. Pressure gauge; 4. Bottle cap docking assembly; 401. Connecting joint; 402. Sliding strip; 403. Sliding groove; 404. External connecting pipe; 5. Sealing assembly; 501. Miniature air pump; 502. Diverter pipe; 503. Delivery pipe; 504. Fixing ring; 505. Sealing airbag; 506. Electric telescopic rod one; 6. Bottle cap control assembly; 601. Control shaft; 602. Limiting strip; 603. Connecting rod; 604. Mounting hole; 605. Electric telescopic rod two; 606. Base; 607. Sliding rod; 608. Clamping strip; 609. Sliding ring; 610. Electric push rod; 611. Return spring; 612. Transmission bar; 613. Drive motor; 7. Support frame. Detailed Implementation

[0023] 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.

[0024] like Figure 1-10 As shown, the present invention provides a technical solution: an online airtightness testing device for bottle caps, comprising: The base 1 has a connecting groove 2 in the middle of its surface. A pressure gauge 3 is fixedly connected to the outside of the base 1, and the detection end of the pressure gauge 3 passes through the base 1 and extends into the interior of the connecting groove 2 to detect the pressure change inside the connecting groove 2 and thus determine the sealing performance of the bottle cap. Bottle cap docking assembly 4 is fixedly connected to the surface of base 1 and is located directly above the connecting groove 2. The interior of bottle cap docking assembly 4 and connecting groove 2 form an airtightness detection chamber. The sealing component 5 is fixedly connected to the inner side of the bottle cap docking component 4, and the other end of the sealing component 5 passes through the connecting groove 2 and extends to the bottom of the base 1, and is used to seal the gap at the connection of the bottle cap docking component 4. The bottle cap control assembly 6 is located directly above the bottle cap docking assembly 4. It is used to clamp the bottle cap and rotate it to the top of the bottle cap docking assembly 4 for sealing detection. A support frame 7 is fixedly connected to the outside of the bottle cap control assembly 6, and the bottom of the support frame 7 is fixedly connected to the outside of the base 1.

[0025] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 9 As shown, the bottle cap mating assembly 4 includes three mating joints 401, which are nested together. Each mating joint 401 has a threaded outer side for mating with bottle caps of different diameters, achieving compatibility of a single device with multiple bottle cap sizes. The bottoms of the two inner mating joints 401 are fixedly connected to slide bars 402 in a circular array, and the slide bars 402 are T-shaped. The inner sides of the two outer mating joints 401 each have several grooves 403, which are adapted to the slide bars 402. The sliding connection is inside the slide groove 403. The T-shaped sliding fit provides a precise guide trajectory for the telescopic movement of the inner connector 401, and effectively prevents the connector 401 from shifting or coming off during the sliding process, ensuring smooth and stable telescopic switching. The bottom of the base 1 is fixedly connected to two symmetrically arranged external pipes 404, and the other end of the external pipes 404 passes through the base 1 and extends into the interior of the connecting groove 2. It is used to connect external pressurization equipment to provide stable pressurization to the interior of the connecting groove 2, providing a reliable high-pressure air source for airtightness testing.

[0026] like Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 10As shown, the sealing assembly 5 includes a miniature air pump 501, which is fixedly connected to the bottom of the base 1 as a pneumatic power source for sealing the gap. A diversion pipe 502 is fixedly connected to the bottom of the connecting groove 2, and the output end of the miniature air pump 501 is connected to the bottom of the diversion pipe 502 via a pipe passing through the base 1 for guiding and distributing gas. The diversion pipe 502 is foldable and telescopic, adaptively extending and retracting synchronously with the extension and retraction of the connector 401, effectively avoiding motion interference. Two sets of delivery pipes 503 arranged in a ring array are fixedly connected to the outside of the diversion pipe 502, and a passage is formed between the delivery pipes 503, the diversion pipe 502, and the output end of the miniature air pump 501 to ensure smooth and even gas distribution. The sealing assembly 5 also includes a fixing ring 504, which is fixedly connected to the base 1. The bottom of the two inner connectors 401 and the outer side of the fixing ring 504 are provided with docking grooves. The sealing airbags 505 are fixedly connected to the inside of the docking grooves to effectively seal the gap between the bottom of the two inner and outer connectors 401 when the connectors 401 are extended. The end of the delivery pipe 503 away from the diversion pipe 502 passes through the fixing ring 504 and is fixedly connected to and communicates with the sealing airbags 505, so that the gas output by the micro air pump 501 can accurately fill the sealing airbags 505 to cause them to expand and achieve absolute sealing of the detection chamber. The bottom of the fixing ring 504 is fixedly connected to the electric telescopic rod 506, and the bottom of the electric telescopic rod 506 is fixedly connected to the bottom of the connecting groove 2. Through the precise extension and retraction drive of the electric telescopic rod 506, the corresponding connectors 401 are smoothly pushed out for bottle cap docking, ensuring the stability and efficiency of specification switching and docking process.

[0027] like Figure 1 , Figure 2 , Figure 6 , Figure 7 and Figure 8As shown, the bottle cap control assembly 6 includes a control shaft 601. Two symmetrically arranged limiting strips 602 are fixedly connected to the outer side of the control shaft 601 for precisely transmitting rotational torque. A drive motor 613 is fixedly connected to the top of the support frame 7, and the output end of the drive motor 613 passes through the support frame 7 and is fixedly connected to the top of the control shaft 601 to provide power to drive the control shaft 601 to rotate. A mounting hole 604 is provided at the top of the connecting rod 603, and the cross-section of the mounting hole 604 is adapted to the connection cross-section of the control shaft 601 and the limiting strips 602. The control shaft 601 is slidably connected to the inside of the mounting hole 604 via the limiting strip 602. This cross-sectional adaptation design allows the control shaft 601 to drive the connecting rod 603 to rotate synchronously, while allowing the two to slide relative to each other in the axial direction. The bottom of the mounting hole 604 is fixedly connected to an electric telescopic rod 605, and the telescopic end of the electric telescopic rod 605 is fixedly connected to the bottom of the control shaft 601. This is used to drive the connecting rod 603 to rotate while achieving relative vertical extension and retraction, thereby accurately simulating and completing the rotating and pressing tightening action of the bottle cap. The bottle cap control assembly 6 also includes a base 606, which is fixedly connected to the bottom of the connecting rod 603, serving as a rigid support base for the clamping mechanism. Four slide rods 607 are evenly and fixedly connected to the outside of the base 606, providing a stable and uniform guide trajectory. Clamping strips 608 are slidably connected to the outside of the slide rods 607, and the bottom of each clamping strip 608 is arc-shaped to fit the contour of the bottle cap edge. Anti-slip grooves are provided on the inner side of each clamping strip 608 to increase friction and firmly clamp the bottle cap. A sliding ring 609 is sleeved on the outside of the connecting rod 603. An electric push rod 610 is fixedly connected to the surface of the base 606, and the telescopic end of the electric push rod 610 is fixedly connected to... Attached to the bottom of the sliding ring 609, it is used to drive the sliding ring 609 to move up and down. A return spring 611 is fixedly connected to the bottom of the sliding ring 609, and the return spring 611 is sleeved on the outside of the connecting rod 603 to provide buffer and auxiliary return potential energy for the sliding ring 609. The outer side of the sliding ring 609 is movably connected to the transmission bar 612 through the rotating shaft, and the other end of the transmission bar 612 is movably connected to the top of the clamping bar 608 through the rotating shaft. Through the up and down movement of the sliding ring 609, the transmission bar 612 is hinged and driven, which is cleverly transformed into the clamping and releasing action of the clamping bar 608 along the slide rod 607, realizing the automated and reliable gripping and releasing of the bottle cap.

[0028] Working principle: When the bottle cap is delivered to the inspection station, the bottle cap control component 6 starts to operate. The electric push rod 610, which is fixedly connected to the surface of the base 606, retracts and drives the sliding ring 609 to slide upward along the outside of the connecting rod 603. At the same time, the return spring 611 applies a reaction force to the sliding ring 609. The upward movement of the sliding ring 609 pulls the transmission bar 612 through the rotating shaft, so that the clamping bar 608 gathers towards the center along the slide rod 607 and uses its inner anti-slip groove to firmly clamp the bottle cap. After the clamping is stable, the drive motor 613 fixedly connected to the top of the support frame 7 starts, driving the control shaft 601 to rotate. Since the limiting strip 602 on the outside of the control shaft 601 is compatible with the section of the mounting hole 604 at the top of the connecting rod 603, the control shaft 601 drives the connecting rod 603 and the clamped bottle cap to rotate synchronously. At the same time, the electric telescopic rod 605 inside the mounting hole 604 extends out, driving the connecting rod 603 to move downward relative to the control shaft 601, realizing the rotation and pressing action of the bottle cap. At the same time, according to the diameter of the bottle cap, the corresponding electric telescopic rod 506 is activated and extended, pushing the fixing ring 504 and the inner connector 401 connected to it to move upward. The T-shaped slide bar 402 on the outside of the connector 401 slides along the slide groove 403 on the inside of the outer connector 401, so that the target connector 401 extends out, and its outer mating thread precisely screws into the bottle cap that is rotated and pressed down, thereby forming a sealed airtightness detection chamber directly above the connecting groove 2. Since the three connectors 401 are nested together, when the inner connector 401 extends, a connection gap will be generated between it and the outer connector 401. At this time, the miniature air pump 501 fixedly connected to the bottom of the base 1 is started. The output gas passes through the pipe, the diversion pipe 502 located inside the connecting groove 2 and the delivery pipe 503 in sequence. Since the diversion pipe 502 is foldable and telescopic, it can adapt to the length change with the extension and retraction of the connector 401. The gas finally enters the sealing airbag 505 fixedly connected to the outer docking groove of the fixing ring 504, causing it to expand and completely seal the gap between the bottom of the inner connector 401 and the outer connector 401, ensuring the absolute sealing of the airtightness detection chamber. After the test chamber is sealed, the external pressurization device injects high-pressure gas into the connecting groove 2 of the base 1 through two external pipes 404. The gas enters the sealed test chamber composed of the bottle cap, the connector 401 and the connecting groove 2. At this time, observe the pressure gauge 3 fixedly connected to the outside of the base 1. If the pressure in the sealed chamber remains stable, it means that the bottle cap is sealed. If the pressure value drops, it means that the bottle cap is leaking and the sealing is not qualified. After the test is completed, the miniature air pump 501 draws air to cause the sealing airbag 505 to contract and reset, the outer pipe 404 is depressurized, the electric telescopic rod 506 retracts, driving the connector 401 to retract to its original position. Subsequently, the electric push rod 610 extends, the sliding ring 609 moves down, compressing the reset spring 611, which pushes the clamping strip 608 to expand outward along the slide rod 607 through the transmission bar 612, releasing the bottle cap and completing a single airtightness test cycle.

[0029] It should be noted that in this document, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, unless otherwise explicitly specified and limited, the terms "fixed," "installed," "connected," and "linked" should be interpreted broadly. For example, "installed" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a mechanical connection or an electrical connection; "linked" can be a direct connection, an indirect connection through an intermediate medium, or a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0030] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An online airtightness testing device for bottle caps, characterized in that, include: The base (1) has a connecting groove (2) in the middle of its surface. A pressure gauge (3) is fixedly connected to the outside of the base (1). The detection end of the pressure gauge (3) passes through the base (1) and extends into the inside of the connecting groove (2) to detect the pressure change inside the connecting groove (2) and thus determine the sealing performance of the bottle cap. Bottle cap docking assembly (4), the bottle cap docking assembly (4) is fixedly connected to the surface of the base (1), and the bottle cap docking assembly (4) is located directly above the connecting groove (2). The interior of the bottle cap docking assembly (4) and the connecting groove (2) form an airtightness detection chamber. A sealing component (5) is fixedly connected to the inner side of the bottle cap docking component (4), and the other end of the sealing component (5) passes through the connecting groove (2) and extends to the bottom of the base (1) to seal the gap at the connection of the bottle cap docking component (4). The bottle cap control assembly (6) is located directly above the bottle cap docking assembly (4) and is used to clamp the bottle cap and rotate it to the top of the bottle cap docking assembly (4) for sealing detection. The bottle cap control assembly (6) is fixedly connected to a support frame (7) on its outer side, and the bottom of the support frame (7) is fixedly connected to the outer side of the base (1).

2. The online airtightness testing device for bottle caps according to claim 1, characterized in that, The bottle cap docking assembly (4) includes: Three connectors (401) are nested together, and each connector (401) has a mating thread on its outer side for mating with bottle caps of different diameters. Slide bar (402), the slide bar (402) is fixedly connected to the bottom of the two inner connectors (401) in a ring array, and the slide bar (402) is T-shaped; Among them, the inner sides of the two outer connectors (401) are provided with several sliding grooves (403), and the sliding grooves (403) are adapted to the sliding strips (402), and the sliding strips (402) are slidably connected to the inside of the sliding grooves (403).

3. The online airtightness testing device for bottle caps according to claim 1, characterized in that, The base (1) is fixedly connected to two symmetrically arranged external pipes (404), and the other end of the external pipes (404) penetrates the base (1) and extends into the interior of the connecting groove (2) for external pressurization equipment to pressurize and deliver to the interior of the connecting groove (2).

4. The online airtightness testing device for bottle caps according to claim 2, characterized in that, The sealing assembly (5) includes: A miniature air pump (501) is fixedly connected to the bottom of the base (1); The diversion pipe (502) is fixedly connected to the bottom of the connecting groove (2), and the output end of the micro air pump (501) is connected to the bottom of the diversion pipe (502) through the base (1) via a pipe; The diverter tube (502) is foldable and telescopic, used to follow the extension and retraction movement of the connector (401). Two sets of delivery tubes (503) arranged in a ring array are fixedly connected to the outside of the diverter tube (502), and a passage is formed inside the delivery tube (503), the diverter tube (502) and the output end of the micro air pump (501).

5. The online airtightness testing device for bottle caps according to claim 4, characterized in that, The sealing assembly (5) further includes: A fixing ring (504) is fixedly connected to the bottom of two inner connectors (401) respectively, and a mating groove is provided on the outer side of the fixing ring (504). The sealing airbag (505) is fixedly connected to the inside of the docking groove to seal the gap between the bottoms of the two docking joints (401). The end of the delivery pipe (503) away from the diversion pipe (502) passes through the fixing ring (504) and is fixedly connected and communicated with the sealing airbag (505).

6. The online airtightness testing device for bottle caps according to claim 5, characterized in that, The bottom of each fixing ring (504) is fixedly connected to an electric telescopic rod (506), and the bottom of the electric telescopic rod (506) is fixedly connected to the bottom of the connecting groove (2) for pushing out the corresponding connector (401) to connect the bottle cap.

7. The online airtightness testing device for bottle caps according to claim 1, characterized in that, The bottle cap control assembly (6) includes: A control shaft (601) has two symmetrically arranged limiting strips (602) fixedly connected to its outer side. A drive motor (613) is fixedly connected to the top of the support frame (7), and the output end of the drive motor (613) passes through the support frame (7) and is fixedly connected to the top of the control shaft (601) for driving the control shaft (601) to rotate. A connecting rod (603) has a mounting hole (604) at its top end. The cross section of the mounting hole (604) is adapted to the connecting cross section of the control shaft (601) and the limiting strip (602). The control shaft (601) is slidably connected to the inside of the mounting hole (604) through the limiting strip (602). The bottom of the mounting hole (604) is fixedly connected to an electric telescopic rod two (605), and the telescopic end of the electric telescopic rod two (605) is fixedly connected to the bottom of the control shaft (601), which is used to drive the connecting rod (603) to rotate while being able to extend and retract relative to each other.

8. The online airtightness testing device for bottle caps according to claim 7, characterized in that, The bottle cap control assembly (6) also includes: A base (606) is fixedly connected to the bottom of a connecting rod (603); Slide rod (607), the slide rod (607) is provided with four rods and is evenly fixedly connected to the outside of the base (606); The clamping strip (608) is slidably connected to the outside of the slide bar (607), and the bottom of the clamping strip (608) is arc-shaped. The inner side of the clamping strip (608) is provided with anti-slip grooves for clamping bottle caps. A sliding ring (609) is sleeved on the outside of the connecting rod (603); An electric push rod (610) is fixedly connected to the surface of the base (606), and the telescopic end of the electric push rod (610) is fixedly connected to the bottom of the sliding ring (609).

9. The online airtightness testing device for bottle caps according to claim 8, characterized in that, A return spring (611) is fixedly connected to the bottom of the sliding ring (609), and the return spring (611) is sleeved on the outside of the connecting rod (603). A transmission bar (612) is movably connected to the outside of the sliding ring (609) through a rotating shaft, and the other end of the transmission bar (612) is movably connected to the top of the clamping bar (608) through a rotating shaft, which is used to convert the up and down movement of the sliding ring (609) into the clamping and expansion of the clamping bar (608).

10. A method for online airtightness testing of bottle caps, characterized in that, The online airtightness testing device for bottle caps according to any one of claims 1-9 comprises the following steps: S1. When the bottle cap is delivered to the inspection station, the bottle cap control component (6) starts to operate. The electric push rod (610) fixedly connected to the surface of the base (606) retracts, driving the sliding ring (609) to slide upward along the outside of the connecting rod (603). The reset spring (611) simultaneously applies a reaction force to the sliding ring (609). The upward movement of the sliding ring (609) pulls the transmission bar (612) through the rotating shaft, causing the clamping bar (608) to converge towards the center along the slide rod (607), using the anti-slip groove on its inner side to firmly clamp the bottle cap. S2. After the clamping is stable, the drive motor (613) fixedly connected to the top of the support frame (7) starts and drives the control shaft (601) to rotate. Since the limit strip (602) on the outside of the control shaft (601) matches the cross section of the mounting hole (604) at the top of the connecting rod (603), the control shaft (601) drives the connecting rod (603) and the clamped bottle cap to rotate synchronously. At the same time, the electric telescopic rod two (605) inside the mounting hole (604) extends out and drives the connecting rod (603) to move downward relative to the control shaft (601), thereby realizing the rotation and pressing action of the bottle cap. S3. At the same time, according to the diameter of the bottle cap, the corresponding electric telescopic rod (506) is activated and extended, pushing the fixing ring (504) and the inner connector (401) connected to it to move upward. The T-shaped slide bar (402) on the outside of the connector (401) slides along the slide groove (403) on the inside of the outer connector (401), so that the target connector (401) extends out, and its outer mating thread precisely screws into the bottle cap that is rotated and pressed down, thereby forming a sealed airtightness detection chamber directly above the connecting groove (2). S4. Since the three connectors (401) are nested together, when the inner connector extends, a gap will be formed between it and the outer connector. At this time, the micro air pump (501) fixedly connected to the bottom of the base (1) is started. The output gas passes through the pipe, the diversion pipe (502) located inside the connecting groove (2) and the delivery pipe (503) in sequence. Since the diversion pipe (502) is foldable and telescopic, it can adapt to the length change with the telescopic movement of the connector (401). The gas finally enters the sealing airbag (505) fixedly connected to the outer docking groove of the fixing ring (504), causing it to expand and completely seal the gap between the bottom of the inner connector and the outer connector, ensuring the absolute sealing of the airtightness test chamber. S5. After the test chamber is sealed, the external pressurization device injects high-pressure gas into the connecting groove (2) of the base (1) through two external pipes (404). The gas enters the sealed test chamber composed of the bottle cap, the connector (401) and the connecting groove (2). At this time, observe the pressure test gauge (3) fixedly connected to the outside of the base (1). If the pressure in the sealed chamber remains stable, it indicates that the bottle cap is sealed. If the pressure value drops, it indicates that the bottle cap is leaking and the sealing is not qualified. S6. After the test is completed, the micro air pump (501) draws air to cause the sealing airbag (505) to contract and reset, the outer pipe (404) is depressurized, the electric telescopic rod (506) retracts, and the coupling (401) retracts to its original position. Then, the electric push rod (610) extends, the sliding ring (609) moves down, compresses the reset spring (611), and pushes the clamp (608) along the slide rod (607) to expand outward through the transmission bar (612), loosening the bottle cap and completing a single airtightness test cycle.

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