Airtight detection device for plastic drum

Abstract

The utility model discloses a kind of plastic bucket airtightness detection devices, including rack, test machine case, lifting sealing structure, air pipe assembly and standard cover, the test machine case is installed in rack one side, lifting sealing structure is installed in rack other side, the lifting sealing structure includes sliding frame, hydraulic telescopic link and moving plate, the moving plate one side is penetrated and sealed fixed with air pipe assembly, air pipe assembly is connected with the leak detector in test machine case, air pipe assembly includes metal pipe, upper cone seat, threaded pipe and lower cone seat, the utility model is clamped by the design of standard cover and cone seat, when detecting cover state, standard cover is clamped between upper cone seat and lower cone seat, then with plastic bucket is screwed, completely simulate the sealing state when actual use.

Description

Technical Field

[0001] This utility model relates to the field of plastic bucket production technology, and more specifically, to a plastic bucket airtightness testing device. Background Technology

[0002] In the plastic bucket manufacturing industry, airtightness is one of the key indicators for measuring product quality. If a plastic bucket has airtightness defects, such as pinholes in the bucket wall or a poor seal at the bucket opening, it will lead to leakage of the contained liquids or gases, causing not only material loss but also potential safety accidents, such as when containing flammable, explosive, or corrosive materials. Therefore, plastic buckets must undergo rigorous airtightness testing before leaving the factory.

[0003] Currently, most methods for testing the airtightness of plastic buckets on the market employ immersion testing and vacuum testing. While immersion testing can perform a seal test on plastic buckets with lids installed, it requires cleaning the water after the test, making the operation cumbersome. Although vacuum testing can complete the seal test on lidded buckets, it is limited by the size of the tooling; when testing larger plastic buckets, the entire tooling needs to be replaced. Ordinary equipment that directly pressurizes plastic buckets can mostly only perform airtightness tests on empty buckets without lids, making it difficult to simulate the actual usage state of plastic buckets with sealed lids installed. Therefore, there is an urgent need for a new type of plastic bucket airtightness testing device to solve the above problems. Utility Model Content

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A plastic barrel airtightness testing device includes a frame, a testing chassis, a lifting and sealing structure, an air pipe assembly, and a standard cap;

[0006] The test chassis is installed on one side of the frame, and the lifting and sealing structure is installed on the other side of the frame. The lifting and sealing structure includes a sliding frame, a hydraulic telescopic rod, and a moving plate.

[0007] A gas tube assembly is fixedly and sealed to one side of the movable plate, and the gas tube assembly is connected to the leak detector in the test chamber.

[0008] The tracheal assembly includes a metal tube, an upper conical seat, a threaded tube, and a lower conical seat;

[0009] The metal tube is provided with an upper conical seat at the bottom end, and a threaded tube is installed inside the metal tube through a threaded structure, with a lower conical seat installed at the bottom of the threaded tube.

[0010] The standard cover is positioned between the upper and lower conical seats, and the threaded tube passes through the standard cover.

[0011] Furthermore, a hydraulic telescopic rod is installed on the top of the sliding frame, and the output end of the hydraulic telescopic rod is connected to the moving plate; a vertical guide rail is provided inside the sliding frame, and sliders adapted to the guide rail are provided on both sides of the moving plate. The moving plate is movably installed inside the sliding frame through the cooperation of the sliders and the guide rail, and slides up and down along the guide rail.

[0012] Furthermore, when the threaded tube rotates clockwise, its depth inside the metal tube increases, and the lower conical seat moves upward with the threaded tube and clamps the standard cap together with the upper conical seat; when the threaded tube rotates counterclockwise, it exits the metal tube, and the lower conical seat moves downward with the threaded tube and releases the standard cap.

[0013] Furthermore, the end face of the upper conical seat facing the standard cover is provided with an annular rubber sealing gasket, and the end face of the lower conical seat facing the standard cover is provided with an annular rubber sealing gasket coaxial with the annular sealing gasket. The two sets of sealing gaskets are respectively attached to the upper and lower surfaces of the standard cover.

[0014] Furthermore, the end of the metal tube of the tracheal assembly away from the upper cone seat is sealed to the output end of the leak detector inside the test chamber via a sealing joint.

[0015] Furthermore, a controller is installed at the top inside the test chamber, and a leak detector is installed at the bottom inside the test chamber. The controller, the leak detector, and the hydraulic telescopic rod are all electrically connected.

[0016] Furthermore, a placement seat is provided on one side of the lower part of the frame, and the central axis of the placement seat coincides with the central axis of the moving plate of the lifting and sealing structure.

[0017] Furthermore, the surface of the placement base is provided with an anti-slip rubber pad, and the surface of the anti-slip rubber pad is provided with a grid-like anti-slip texture.

[0018] Furthermore, the standard cap is a detachable structure, and its inner diameter and thread type are adapted to the diameter and thread of the plastic bucket to be tested. A through hole for the threaded tube to pass through is opened in the middle of the standard cap, and a rubber sealing ring is provided on the inner wall of the through hole.

[0019] Furthermore, the controller is equipped with a touch screen display, which displays the leak detector's detection pressure value, pressure holding time, and airtightness test results; the controller also has an alarm module that can emit audible and visual alarm signals.

[0020] In summary, this utility model has the following beneficial technical effects:

[0021] This invention utilizes a standard cap and conical seat clamping design. When testing a capped container, the standard cap is clamped between the upper and lower conical seats and then screwed onto the plastic bucket, completely simulating the sealing state during actual use. When testing an empty, capless bucket, the lower conical seat is directly sealed to the bucket opening, achieving dual-scenario testing. This covers the entire process testing needs of semi-finished empty buckets and finished capped buckets in plastic bucket production. Furthermore, this device adopts a dry, pressurized airtightness testing method, eliminating the need for contact with water throughout the process and removing the cleaning steps caused by water adhesion. No tooling is required during the testing process, improving versatility. Attached Figure Description

[0022] The disclosure of this utility model is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this utility model. In the drawings, the same reference numerals are used to refer to the same parts.

[0023] in:

[0024] Figure 1 This is a three-dimensional schematic diagram of the present invention;

[0025] Figure 2 This is a bottom view of the present invention;

[0026] Figure 3 This is a front view of the present invention;

[0027] Figure 4 This is a schematic diagram of the trachea assembly and standard cap structure of this utility model;

[0028] Figure 5 This is a schematic diagram of the exploded structure of the tracheal assembly of this utility model;

[0029] Figure 6 This is a schematic diagram of the exploded structure of the tracheal assembly of this utility model from another perspective;

[0030] Figure 7 This is a schematic diagram of the frame structure of this utility model.

[0031] Figures 1-7 Explanation of reference numerals in the attached drawings: 1. Frame; 101. Placement seat; 2. Test chamber; 201. Controller; 202. Leak detector; 3. Lifting and sealing structure; 301. Sliding frame; 302. Hydraulic telescopic rod; 303. Moving plate; 4. Air pipe assembly; 401. Metal pipe; 402. Upper conical seat; 403. Threaded pipe; 404. Lower conical seat; 5. Standard cover. Detailed Implementation

[0032] Based on the technical solution of this utility model, without changing the essential spirit of this utility model, those skilled in the art can propose various interchangeable structural methods and implementation methods. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative descriptions of the technical solution of this utility model, and should not be regarded as the entirety of this utility model or as a limitation or restriction of the technical solution of this utility model.

[0033] The following is in conjunction with the attached diagram ( Figures 1-7 The present invention will be further described in detail with reference to specific embodiments, but the present invention is not limited to the following embodiments.

[0034] Example 1

[0035] like Figure 1 As shown, a plastic bucket airtightness testing device includes a frame 1, a testing chamber 2, a lifting and sealing structure 3, an air pipe assembly 4, and a standard cover 5.

[0036] The frame 1 is made of square steel welded into a frame structure with sufficient load-bearing strength. The test box 2 is fixed to one side of the frame 1 by bolts. The test box 2 is a rectangular metal box. The lifting and sealing structure 3 is fixed to the other side of the frame 1 by welding and is symmetrically distributed with the test box 2 to ensure that the overall force of the device is balanced.

[0037] like Figure 2 As shown, the lifting and sealing structure 3 includes a sliding frame 301, a hydraulic telescopic rod 302, and a moving plate 303. A vertical guide rail is provided on the inner wall of the sliding frame 301. The hydraulic telescopic rod 302 is fixed to the top of the sliding frame 301 via a flange. The piston rod end of the hydraulic telescopic rod 302 is connected to the top center of the moving plate 303 via a coupling. The moving plate 303 is a rectangular metal plate with sliders integrally formed on both sides. The sliders slide in cooperation with the guide rails of the sliding frame 301, allowing the moving plate 303 to move smoothly up and down along the guide rails, preventing deviation during movement. A mounting hole is provided through the center of the moving plate 303. The air pipe assembly 4 is sealed and fixed in the mounting hole by a sealing ring, ensuring no gas leakage between the air pipe assembly 4 and the moving plate 303.

[0038] like Figures 4-6As shown, the tracheal assembly 4 includes a metal tube 401, an upper conical seat 402, a threaded tube 403, and a lower conical seat 404. The metal tube 401 is a hollow steel tube, and its bottom end is fixedly connected to the top of the upper conical seat 402 by welding. The upper conical seat 402 is a conical metal part, and its end face facing the standard cover 5 has an annular groove, in which an annular rubber sealing gasket is embedded. The inner wall of the metal tube 401 has an internal thread that matches the external thread of the threaded tube 403. The depth of the threaded tube 403 entering the metal tube 401 can be adjusted by rotation. The bottom of the threaded tube 403 is fixed to the lower conical seat 404 by a threaded connection. The structure of the lower conical seat 404 is the same as that of the upper conical seat 402. Its end face facing the standard cover 5 also has an annular rubber sealing gasket, and the center lines of the two sets of sealing gaskets coincide.

[0039] The standard cover 5 is located between the upper cone seat 402 and the lower cone seat 404. The standard cover 5 is made of plastic and has an internal thread on its inner wall, which is compatible with the external thread of the opening of the plastic bucket to be tested. A through hole is opened in the center of the standard cover 5, and the threaded tube 403 passes through the through hole.

[0040] like Figure 1 As shown, a placement seat 101 is fixed to one side of the lower part of the frame 1 by bolts. An anti-slip rubber pad is adhered to the upper surface of the placement seat 101. The surface of the rubber pad is pressed with a grid-like anti-slip texture, which can increase the friction between the plastic bucket and the placement seat 101 and prevent the plastic bucket from shifting during the testing process.

[0041] The test chamber 2 is divided into upper and lower layers by a partition. The upper layer is fixed with a controller 201 by screws, and the lower layer is fixed with a leak detector 202. The controller 201 is a PLC controller with a touch screen embedded on the front and an emergency stop button below the screen. The leak detector 202 is a high-precision pressure leak detector. Its air inlet is connected to an external air source through an air pipe, and its air outlet is connected to the metal pipe 401 of the air pipe assembly 4 through a sealed connector. The controller 201 is electrically connected to the leak detector 202 and the hydraulic telescopic rod 302 through wires, which can realize the linkage control of each component.

[0042] Example 2

[0043] Based on Example 1, this embodiment optimizes the structure of the standard lid 5 to adapt to plastic buckets of different sizes.

[0044] The standard cap 5 is set in multiple sets of different specifications. The inner diameter and thread type of each set of standard cap 5 are adapted to the barrel opening diameter and barrel opening thread of different plastic barrels to be tested. The through hole diameter of the standard cap 5 is uniform, ensuring that each set of standard cap 5 can be used with the same threaded tube 403. When it is necessary to test plastic barrels of different specifications, simply rotate the threaded tube 403 counterclockwise to move the lower cone seat 404 downward and loosen the old standard cap 5. After removing the old standard cap 5, replace it with the new standard cap 5 of the corresponding specification. Then rotate the threaded tube 403 clockwise to move the lower cone seat 404 upward and clamp the new standard cap 5 together with the upper cone seat 402. The specification switching can be completed. The operation is convenient and there is no need to replace other parts such as the air tube assembly 4.

[0045] Example 3

[0046] Reference Figure 7 Based on Example 1, this embodiment can remove the standard cap 5 and replace it with a round open bucket placed on the placement seat 101. The hydraulic telescopic rod 302 pushes the moving plate 303 to seal the top of the round bucket. The bottom of the moving plate 303 is provided with a large area rubber pad to ensure the sealing effect. Then, a pressure test is performed, which can be used to test the airtightness of different types of plastic buckets.

[0047] The working principle of this utility model:

[0048] According to the specifications of the plastic bucket to be tested, select a suitable standard cap 5 and install it between the upper conical seat 402 and the lower conical seat 404. Set the test parameters, test pressure, holding time, and qualified pressure threshold through the touch screen of the controller 201. Check whether the sealing joint of the air pipe assembly 4 is tightly connected and whether the slider of the hydraulic telescopic rod 302 and the guide rail are smoothly matched. Place the plastic bucket to be tested with the opening facing up on the placement seat 101. Start the hydraulic telescopic rod 302 through the controller 201. The piston rod of the hydraulic telescopic rod 302 extends downward, driving the moving plate 303 to move downward along the guide rail until the standard cap 5 under the lower conical seat 404 contacts the opening of the plastic bucket. Continue to control the moving plate 303 to move downward so that the standard cap 5 is screwed into the opening of the bucket. Manual assistance can be used to tighten it to complete the sealing and positioning of the plastic bucket.

[0049] The controller 201 sends a start signal to the leak detector 202, which injects gas into the gas tube assembly 4. The gas passes through the metal tube 401 and the threaded tube 403 in sequence and enters the plastic bucket until the pressure inside the bucket reaches the preset detection pressure. Then, the leak detector 202 stops inflating and enters the pressure holding stage. The controller 201 collects the pressure data fed back by the leak detector 202 in real time and calculates the pressure drop value during the pressure holding time.

[0050] If the pressure drop is less than or equal to the qualified pressure threshold, the plastic bucket is deemed to be airtight, the touch screen of controller 201 displays "qualified", and the alarm module emits a green light as a warning; if the pressure drop is greater than the qualified pressure threshold, the plastic bucket is deemed to be airtight, the touch screen of controller 201 displays "unqualified", the alarm module emits a red light and a buzzer as a warning, and records the pressure data at the time of the unqualified condition.

[0051] After the test is completed, the leak detector 202 automatically releases the gas inside the plastic bucket. The controller 201 controls the piston rod of the hydraulic telescopic rod 302 to retract upward, which drives the moving plate 303 and the air pipe assembly 4 to move upward, so that the standard cover 5 separates from the mouth of the plastic bucket. The tested plastic bucket is then removed from the placement seat 101, and the next plastic bucket can be tested.

[0052] If it is necessary to test an empty bucket without a lid, simply skip the step of "installing the standard lid 5" and directly control the lower cone seat 404 to seal and fit the opening of the plastic bucket. The subsequent testing process is the same as that for buckets with lids, enabling flexible switching between testing empty and lidded buckets.

[0053] Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the present invention and are not intended to limit the invention. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations to the embodiments as needed without departing from the principles and spirit of the present invention, provided that such modifications, substitutions, and variations are within the scope of the claims of the present invention and are protected by patent law.

Claims

1. A device for detecting the airtightness of a plastic bucket, characterized in that, Includes a frame (1), a test chassis (2), a lifting and sealing structure (3), an air pipe assembly (4), and a standard cover (5); The test chassis (2) is installed on one side of the frame (1), and the lifting and sealing structure (3) is installed on the other side of the frame (1). The lifting and sealing structure (3) includes a sliding frame (301), a hydraulic telescopic rod (302), and a moving plate (303). The movable plate (303) has a gas tube assembly (4) that is fixed through and sealed on one side. The gas tube assembly (4) is connected to the leak detector (202) inside the test box (2). The tracheal assembly (4) includes a metal tube (401), an upper conical seat (402), a threaded tube (403), and a lower conical seat (404). The metal tube (401) is provided with an upper cone seat (402) at the bottom end, and a threaded tube (403) is installed inside the metal tube (401) through a threaded structure. A lower cone seat (404) is installed at the bottom of the threaded tube (403). The standard cover (5) is located between the upper cone seat (402) and the lower cone seat (404), and the threaded tube (403) passes through the standard cover (5).

2. The plastic bucket airtightness testing device according to claim 1, characterized in that: The top of the sliding frame (301) is equipped with a hydraulic telescopic rod (302), and the output end of the hydraulic telescopic rod (302) is connected to the moving plate (303). The sliding frame (301) is provided with a vertical guide rail inside, and the moving plate (303) is provided with sliders on both sides that are adapted to the guide rail. The moving plate (303) is movably installed inside the sliding frame (301) through the sliders and the guide rail, and slides up and down along the guide rail.

3. The plastic bucket airtightness testing device according to claim 1, characterized in that: When the threaded tube (403) rotates clockwise, its depth inside the metal tube (401) increases, and the lower cone (404) moves upward with the threaded tube (403) and clamps the standard cover (5) together with the upper cone (402); when the threaded tube (403) rotates counterclockwise, it exits the metal tube (401), and the lower cone (404) moves downward with the threaded tube (403) and releases the standard cover (5).

4. The plastic bucket airtightness testing device according to claim 3, characterized in that: The upper conical seat (402) has an annular rubber sealing gasket on its end face facing the standard cover (5), and the lower conical seat (404) has an annular rubber sealing gasket coaxial with the annular sealing gasket on its end face facing the standard cover (5). The two sets of sealing gaskets are respectively attached to the upper and lower surfaces of the standard cover (5).

5. The plastic bucket airtightness testing device according to claim 4, characterized in that: The end of the metal tube (401) of the tracheal assembly (4) away from the upper cone seat (402) is sealed to the output end of the leak detector (202) inside the test chamber (2) through a sealing joint.

6. The plastic bucket airtightness testing device according to claim 1, characterized in that: The test chamber (2) is equipped with a controller (201) at the top and a leak detector (202) at the bottom. The controller (201), leak detector (202), and hydraulic telescopic rod (302) are electrically connected.

7. The plastic bucket airtightness testing device according to claim 1, characterized in that: A placement seat (101) is provided on one side of the lower part of the frame (1), and the central axis of the placement seat (101) coincides with the central axis of the moving plate (303) of the lifting sealing structure (3).

8. The plastic bucket airtightness testing device according to claim 7, characterized in that: The surface of the placement base (101) is provided with an anti-slip rubber pad, and the surface of the anti-slip rubber pad is provided with a grid-like anti-slip pattern.

9. The plastic bucket airtightness testing device according to claim 1, characterized in that: The standard cap (5) is a detachable structure, and its inner diameter and thread type are compatible with the diameter and thread of the plastic bucket to be tested. The standard cap (5) has a through hole in the middle for the threaded tube (403) to pass through, and a rubber sealing ring is provided on the inner wall of the through hole.

10. The plastic bucket airtightness testing device according to claim 6, characterized in that: The controller (201) is equipped with a touch screen display, which displays the detection pressure value, pressure holding time and airtightness detection result of the leak detector (202); the controller (201) is equipped with an alarm module, which can emit audible and visual alarm signals.

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