Air tightness detection device for plastic product

Abstract

The utility model belongs to the technical field of plastic product detection, and discloses a plastic product air tightness detection device which comprises a cabinet, a water tank and a mounting frame, a lifting frame is vertically and slidably arranged on the mounting frame, a lifting assembly is arranged on the mounting frame, a placing plate is vertically and slidably arranged on the lifting frame, and a threaded rod is vertically and rotatably arranged on the lifting frame. A rotating shaft concentric with the mounting disc is vertically and rotationally arranged at the top of the mounting frame, a connecting column is concentrically arranged at the lower end of the rotating shaft, circular truncated cones are arranged on the top face of the mounting disc in the circumferential direction at intervals, and clamping grooves matched with the circular truncated cones are formed in the positions, corresponding to the circular truncated cones, of the bottom face of the connecting column; and an inflation assembly is arranged on the lifting frame. A test article is clamped between the placing plate and the top of the lifting frame, the lifting assembly controls the lifting frame and the placing plate to descend, and water immerses the test article. The air inflation assembly box supplies air to the inside of the tested object, and if the air tightness defect exists, the internal air escapes into water to form bubbles.

Description

Technical Field

[0001] This utility model relates to the field of plastic product testing technology, and in particular to a device for testing the airtightness of plastic products. Background Technology

[0002] Plastic products are a general term for household and industrial goods made primarily from plastics. This includes products manufactured using processes such as injection molding and thermoforming. Plastics are a type of synthetic polymer material with malleability. Plastic products include plastic bottles, plastic cups, etc. Some plastic bottles and cups require airtightness testing after production.

[0003] Chinese utility model patent CN216978263U discloses a plastic bottle leakage detection device, including a detection box, a set of telescopic semi-ring assemblies arranged radially within the detection box that can move closer or further apart, a drive structure located below the detection box for driving its rotation, and a sealing and inflation structure located above the detection box. The sealing and inflation structure includes a sealing cap that moves from top to bottom towards or away from the annular clamping ring, an inflation tube passing through the sealing cap, and an inflation mechanism communicating with the inflation tube. Through the coordinated arrangement of the telescopic semi-ring assemblies, the plastic bottle to be tested is clamped and fixed within the detection box. Inflation is performed into the plastic bottle through the inflation tube of the sealing cap. Therefore, if leakage occurs, the gas in the plastic bottle will leak into the detection box. The detection box only needs to be pre-filled with a detection medium such as water, and leakage can be effectively detected by observing the bubbles.

[0004] Regarding the aforementioned technologies, the inventors believe that the following defects exist: During the use of the above-mentioned device, the testing box needs to be pre-filled with testing media such as water, which makes the placement of the plastic bottle to be tested difficult. The operator needs to overcome the buoyancy and resistance of the medium to place the plastic bottle between the telescopic semi-ring components, which is very inconvenient. Utility Model Content

[0005] To address the aforementioned problems, this invention provides an airtightness testing device for plastic products.

[0006] The above-mentioned technical objective of this utility model is achieved through the following technical solution: an airtightness testing device for plastic products, comprising a cabinet, a water tank with a top opening on the cabinet, a mounting frame on the cabinet, a lifting frame vertically slidably mounted on the mounting frame, a lifting assembly for driving the lifting frame to rise and fall on the mounting frame, a placement plate vertically slidably mounted on the lifting frame, a threaded rod vertically rotatably mounted on the lifting frame, the placement plate being helically connected to the threaded rod through a threaded hole, a mounting plate being mounted at the upper end of the threaded rod, a rotating shaft concentrically arranged around the mounting plate being vertically rotatably mounted at the top of the mounting frame, a connecting column concentrically mounted at the lower end of the rotating shaft, frustums spaced circumferentially on the top surface of the mounting plate, a groove corresponding to the frustums being mounted on the bottom surface of the connecting column, and an inflation assembly for inflating the test item on the lifting frame.

[0007] By adopting the above technical solution, a cabinet, mounting frame, lifting frame, lifting assembly, and placement plate are set up. In the initial state, the water tank is pre-filled with testing water. At this time, the frustum on the top surface of the mounting plate is embedded in the slot on the bottom surface of the connecting column, ensuring that the two form a stable synchronous rotation structure. During testing, two items to be tested are placed on the placement plate and positioned on both sides of the threaded rod. Then, the rotating shaft is rotated, causing the connecting column, mounting plate, and threaded rod to rotate synchronously. Since the placement plate is helically connected to the threaded rod through a threaded hole, the rotation of the threaded rod will drive the placement plate to rise according to the thread transmission principle until the top of the test item abuts against the lifting frame, completing the positioning. Next, the lifting assembly is activated, controlling the lifting frame to slowly descend. As the lifting frame moves down, the water in the tank gradually overflows and completely submerges the test item. At this time, the inflation assembly is activated to supply air into the test item, gradually building up internal pressure. The testing personnel need to carefully observe the surface of the test item. If there is an airtightness defect, the internal gas will escape and form bubbles, which can be used to determine the airtightness performance of the test item. The test items are automatically immersed in water, eliminating the need for manual effort from operators to sink them, significantly improving ease of operation.

[0008] Furthermore, the mounting frame includes four columns arranged in a rectangular array, and the upper ends of the four columns are all provided with a top plate.

[0009] Furthermore, the top plate has two square holes, and a vertical groove is provided in the square holes. The lifting frame includes a rack that is vertically slidably disposed in the groove. The lower ends of the two racks are provided with a lifting plate. The bottom surface of the lifting plate is provided with four guide rods arranged in a rectangular array. The placement plate has guide holes corresponding to the guide rods. The guide holes are slidably connected to the corresponding guide rods. The threaded rod is vertically rotatably disposed on the lifting plate.

[0010] Furthermore, the lifting assembly includes mounting seats spaced apart on the top surface of the top plate, and a rotating rod is horizontally rotatably mounted on both mounting seats. Two gears are fixedly sleeved on the rotating rod, and the gears mesh with corresponding racks. A fixed seat is provided on one side of the top plate, and a drive motor is horizontally mounted on the fixed seat. The output shaft of the drive motor passes through the fixed seat and is connected to the end of the rotating rod.

[0011] By adopting the above technical solution, a mounting base, a rotating rod, gears, and a drive motor are set up. The drive motor drives the rotating rod to rotate, which drives the two gears to rotate synchronously, thereby driving the two racks to move vertically synchronously, and then driving the lifting plate, guide rod, and placement plate to rise and fall synchronously.

[0012] Furthermore, two support blocks are spaced apart on the top plate, and a mounting plate is provided on the top of the two support blocks. A power motor is vertically mounted on the mounting plate, and the output shaft of the power motor passes downward through the mounting plate and is connected to the upper end of the rotating shaft.

[0013] By adopting the above technical solution, a support block, a mounting plate, and a power motor are set up, and the power motor drives the rotating shaft to rotate.

[0014] Furthermore, the top of the lifting plate is provided with two mounting holes symmetrically arranged relative to the threaded rod. The inflation assembly includes two inflation pipes respectively vertically arranged in the two mounting holes. The two inflation pipes are connected to a connecting pipe, and the connecting pipe is connected to a corrugated pipe. An air pump is provided on the top plate, and the output end of the air pump is connected to the corrugated pipe.

[0015] By adopting the above technical solution, and setting up mounting holes, inflation pipes, corrugated pipes, and air pumps, when the test item is placed on the placement plate, it is necessary to ensure that the inflation pipe corresponding to the test item is located above the top opening of the test item. After the test item is completely submerged in water, the air pump is started to inflate the corrugated pipes. The gas enters the test item through the corrugated pipes, connecting pipes, and inflation pipes, gradually building up internal pressure.

[0016] Furthermore, baffles are provided at the lower ends of both the guide rod and the threaded rod.

[0017] By adopting the above technical solution, baffles are set at the lower ends of both the guide rod and the threaded rod to limit the lowest descent position of the placement plate.

[0018] Furthermore, the placement plate has two U-shaped placement slots.

[0019] Furthermore, a rubber sheet is provided on the bottom surface of the lifting plate.

[0020] In summary, this utility model has the following beneficial effects: In this application, a cabinet, mounting frame, lifting frame, lifting assembly, and placement plate are provided. In the initial state, the water tank is pre-filled with testing water. At this time, the frustum on the top surface of the mounting plate is embedded in the slot on the bottom surface of the connecting column, ensuring that the two form a stable synchronous rotation structure. During testing, two items to be tested are placed on the placement plate and positioned on both sides of the threaded rod. Then, the rotating shaft is rotated, causing the connecting column, mounting plate, and threaded rod to rotate synchronously. Since the placement plate is helically connected to the threaded rod through a threaded hole, the rotation of the threaded rod, according to the thread transmission principle, drives the placement plate to rise until the top of the test item abuts against the lifting frame, completing the positioning. Next, the lifting assembly is activated, controlling the lifting frame to slowly descend. As the lifting frame moves down, the water in the tank gradually overflows over the test item, completely submerging it. At this time, the inflation assembly is activated to supply air into the test item, gradually building up internal pressure. The testing personnel need to carefully observe the surface of the test item. If there is an airtightness defect, the internal gas will escape, forming bubbles, which can be used to determine the airtightness performance of the test item. The test items are automatically immersed in water, eliminating the need for manual effort from operators to sink them, significantly improving ease of operation. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model;

[0022] Figure 2 This is a schematic diagram of the lifting frame according to an embodiment of the present utility model;

[0023] Figure 3 This is a structural schematic diagram of the lifting frame from another angle according to an embodiment of this utility model;

[0024] Figure 4 yes Figure 3 Enlarged view of part A.

[0025] In the diagram: 10. Cabinet; 11. Water tank; 20. Mounting bracket; 21. Column; 22. Top plate; 23. Slide rail; 30. Lifting frame; 31. Rack; 32. Lifting plate; 33. Guide rod; 40. Lifting assembly; 41. Mounting base; 42. Rotating rod; 43. Gear; 44. Drive motor; 50. Placement plate; 51. Threaded rod; 52. Mounting disc; 53. Rotating shaft; 54. Connecting column; 55. Frustum; 56. Slot; 57. Placement slot; 60. Inflation assembly; 61. Inflation pipe; 62. Connecting pipe; 63. Corrugated pipe; 64. Air pump; 70. Support block; 71. Mounting plate; 72. Drive motor; 80. Baffle. Detailed Implementation

[0026] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0027] like Figure 1-4 As shown in the embodiment of this application, an airtightness testing device for plastic products is disclosed, including a cabinet 10, a mounting frame 20, a lifting frame 30, a lifting assembly 40, and a placement plate 50. The cabinet 10 is equipped with a water tank 11 with a top opening. The mounting frame 20 is mounted on the cabinet 10. The lifting frame 30 is vertically slidably mounted on the mounting frame 20. The lifting assembly 40 is mounted on the mounting frame 20 and is used to drive the lifting frame 30 to rise and fall. The placement plate 50 is vertically slidably mounted on the lifting frame 30 and is used to carry the items to be tested. A threaded rod 51 is vertically rotatably mounted on the lifting frame 30. The placement plate 50 is screwed to the threaded rod 51 through a threaded hole. A mounting plate 52 is mounted on the upper end of the threaded rod 51. A rotating shaft 53, concentrically arranged with the mounting plate 52, is vertically rotatably mounted on the top of the mounting frame 20. A connecting column 54 is concentrically mounted on the lower end of the rotating shaft 53. Frustums 55 are circumferentially spaced on the top surface of the mounting plate 52. A groove 56 corresponding to the frustums 55 is provided on the bottom surface of the connecting column 54 to mate with the frustums 55.

[0028] In the initial state, the water tank 11 is pre-filled with testing water. At this time, the frustum 55 on the top surface of the mounting plate 52 is embedded in the slot 56 on the bottom surface of the connecting column 54, ensuring that the two form a stable synchronous rotation structure. During testing, the two test items are placed on the placement plate 50 and positioned on both sides of the threaded rod 51. Then, the rotating shaft 53 is rotated, causing the connecting column 54, mounting plate 52, and threaded rod 51 to rotate synchronously. Since the placement plate 50 is helically connected to the threaded rod 51 through a threaded hole, the rotation of the threaded rod 51 will drive the placement plate 50 to rise according to the thread transmission principle until the top of the test item abuts against the lifting frame 30, completing the positioning. Next, the lifting assembly 40 is activated, controlling the lifting frame 30 to slowly descend. As the lifting frame 30 moves down, the water in the water tank 11 gradually overflows the test item, completely submerging it. The lifting frame 30 is equipped with an inflation assembly 60 for inflating the test item. The inflation assembly 60 is turned on to supply air into the test item, gradually building up internal pressure. The testing personnel need to carefully observe the surface of the test item. If there is an airtightness defect, the internal gas will escape and form bubbles, which can be used to determine the airtightness performance of the test item. The test item is automatically immersed in water without the need for manual force to sink it, significantly improving the convenience of operation. After the test, the lifting assembly 40 drives the lifting frame 30 to rise. During the descent and ascent of the lifting frame 30, the mounting plate 52 and the connecting column 54 do not rotate, so that after the lifting frame 30 returns to its original position, the frustum 55 remains embedded in the slot 56. The rotating shaft 53 rotates in the opposite direction, driving the placement plate 50 to descend smoothly, after which the test item can be removed.

[0029] Specifically, the mounting frame 20 includes four uprights 21 arranged in a rectangular array, with a top plate 22 shared at the top of each upright. The top plate 22 has two square holes, each containing a vertically arranged groove 23. The lifting frame 30 includes racks 31 vertically slidably positioned within the grooves 23. A lifting plate 32 is shared at the lower ends of the two racks 31. Four guide rods 33 arranged in a rectangular array are vertically arranged on the bottom surface of the lifting plate 32. Guide holes are provided on the placement plate 50 corresponding to the guide rods 33, and these guide holes are slidably connected to the corresponding guide rods 33 to ensure the stability of the lifting of the placement plate 50. A threaded rod 51 is vertically rotatably positioned in the middle of the lifting plate 32, with its upper end passing through the lifting plate 32. Baffles 80 are provided at the lower ends of both the guide rods 33 and the threaded rods 51 to limit the lowest descent position of the placement plate 50. Two U-shaped placement slots 57 are provided on the placement plate 50 for placing test items. The bottom surface of the lifting plate 32 is equipped with a rubber sheet. When the top of the test item comes into contact with the rubber sheet, the sealing effect is better.

[0030] In configuration, the lifting assembly 40 includes mounting seats 41 spaced apart on the top surface of the top plate 22. A rotating rod 42 is horizontally rotatably mounted on both mounting seats 41. Two gears 43 are fixedly fitted onto the rotating rod 42, meshing with corresponding racks 31. Rotation of the rotating rod 42 drives the two gears 43 to rotate synchronously, thereby causing the two racks 31 to move vertically synchronously, which in turn drives the lifting plate 32, guide rod 33, and placement plate 50 to rise and fall synchronously. A fixed seat is provided on one side of the top plate 22, and a drive motor 44 is horizontally mounted on the fixed seat. The output shaft of the drive motor 44 passes through the fixed seat and connects to the end of the rotating rod 42. The drive motor 44 drives the rotating rod 42 to rotate. Two support blocks 70 are spaced apart on the top plate 22, and a mounting plate 71 is shared on the top of the two support blocks 70. A power motor 72 is vertically mounted on the mounting plate 71, and the output shaft of the power motor 72 passes downward through the mounting plate 71 and connects to the upper end of the rotating shaft 53, driving the rotating shaft 53 to rotate.

[0031] In the specific setup, the top of the lifting plate 32 has two mounting holes symmetrically arranged relative to the threaded rod 51. The inflation assembly 60 includes two inflation pipes 61 vertically installed in the two mounting holes, with a connecting pipe 62 connected to both inflation pipes 61. A corrugated pipe 63 is connected to the connecting pipe 62. An air pump 64 is installed on the top plate 22, and the output end of the air pump 64 is connected to the corrugated pipe 63. When the test item is placed on the placement plate 50, it must be ensured that the inflation pipe 61 corresponding to the test item is above the top opening of the test item. After the test item is completely submerged in water, the air pump 64 is started to inflate the corrugated pipe 63. The gas enters the test item through the corrugated pipe 63, the connecting pipe 62, and the inflation pipe 61, gradually building up internal pressure. The corrugated pipe 63 can freely expand and contract with the movement of the lifting frame 30, thereby ensuring the continuity of the air path and allowing the gas to be smoothly delivered from the air pump 64 to the inflation pipe 61 without the air path being disconnected or damaged due to the movement of the lifting frame 30. The cabinet 10 is equipped with a controller for controlling the drive motor 44, the power motor 72, and the air pump 64.

[0032] The operating principle of the airtightness testing device for plastic products in this embodiment is as follows: In the initial state, the water tank 11 is pre-filled with testing water. During testing, two test items are placed on the placement plate 50 and positioned on both sides of the threaded rod 51. The power motor 72 is started to drive the rotating shaft 53, connecting column 54, mounting plate 52, and threaded rod 51 to rotate. This drives the placement plate 50 to rise until the top of the test item abuts against the rubber sheet, completing the positioning. Next, the drive motor 44 is started to drive the rotating rod 42 and gear 43 to rotate, causing the two racks 31, lifting plate 32, guide rod 33, and placement plate 50 to descend. The water in the water tank 11 gradually overflows and completely submerges the test item. At this time, the air pump 64 is turned on to inflate the bellows 63. The gas enters the test item through the bellows 63, connecting pipe 62, and inflation pipe 61, gradually building up internal pressure. The testing personnel need to carefully observe the surface of the test item. If there is an airtightness defect, the internal gas will escape and form bubbles, which can be used to determine the airtightness performance of the test item.

[0033] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. An airtightness testing device for plastic products, characterized in that: The system includes a cabinet (10), a water tank (11) with a top opening on the cabinet (10), a mounting frame (20) on the cabinet (10), a lifting frame (30) vertically slidably mounted on the mounting frame (20), a lifting assembly (40) for driving the lifting frame (30) to rise and fall on the mounting frame (20), a placement plate (50) vertically slidably mounted on the lifting frame (30), and a threaded rod (51) vertically rotatably mounted on the lifting frame (30). The placement plate (50) is connected to the threaded rod (51) through a threaded hole. The spiral connection is provided with a mounting plate (52) at the upper end of the threaded rod (51), and a rotating shaft (53) arranged concentrically with the mounting plate (52) is provided on the top of the mounting frame (20). A connecting column (54) is provided concentrically at the lower end of the rotating shaft (53). A frustum (55) is provided circumferentially at intervals on the top surface of the mounting plate (52). A slot (56) that mates with the frustum (55) is provided on the bottom surface of the connecting column (54) corresponding to the frustum (55). An inflation component (60) for inflating the test item is provided on the lifting frame (30).

2. The airtightness testing device for plastic products according to claim 1, characterized in that: The mounting frame (20) includes four columns (21) arranged in a rectangular array, and the upper ends of the four columns (21) are provided with a top plate (22).

3. The airtightness testing device for plastic products according to claim 2, characterized in that: The top plate (22) has two square holes, and a sliding groove (23) is vertically arranged in the square holes. The lifting frame (30) includes a rack (31) that is vertically slidably arranged in the sliding groove (23). The two racks (31) are provided with a lifting plate (32) at their lower ends. The bottom surface of the lifting plate (32) is provided with four guide rods (33) arranged in a rectangular array. The placement plate (50) has guide holes corresponding to the guide rods (33). The guide holes are slidably connected to the corresponding guide rods (33). The threaded rod (51) is vertically rotatably arranged on the lifting plate (32).

4. The airtightness testing device for plastic products according to claim 3, characterized in that: The lifting assembly (40) includes mounting seats (41) spaced apart on the top surface of the top plate (22). A rotating rod (42) is horizontally rotatably mounted on both mounting seats (41). Two gears (43) are fixedly mounted on the rotating rod (42). The gears (43) mesh with the corresponding racks (31). A fixed seat is provided on one side of the top plate (22). A drive motor (44) is horizontally mounted on the fixed seat. The output shaft of the drive motor (44) passes through the fixed seat and is connected to the end of the rotating rod (42).

5. The airtightness testing device for plastic products according to claim 2, characterized in that: Two support blocks (70) are spaced apart on the top plate (22). The top of the two support blocks (70) is shared by a mounting plate (71). A power motor (72) is vertically mounted on the mounting plate (71). The output shaft of the power motor (72) passes downward through the mounting plate (71) and is connected to the upper end of the rotating shaft (53).

6. The airtightness testing device for plastic products according to claim 3, characterized in that: The top of the lifting plate (32) is provided with two mounting holes symmetrically arranged relative to the threaded rod (51). The inflation assembly (60) includes two inflation pipes (61) respectively vertically arranged in the two mounting holes. The two inflation pipes (61) are connected to a connecting pipe (62). The connecting pipe (62) is connected to a corrugated pipe (63). The top plate (22) is provided with an air pump (64). The output end of the air pump (64) is connected to the corrugated pipe (63).

7. The airtightness testing device for plastic products according to claim 3, characterized in that: Both the guide rod (33) and the threaded rod (51) are provided with baffles (80) at their lower ends.

8. The airtightness testing device for plastic products according to claim 1, characterized in that: The placement plate (50) has two U-shaped placement slots (57).

9. The airtightness testing device for plastic products according to claim 3, characterized in that: The bottom surface of the lifting plate (32) is provided with a rubber sheet.

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