Finished plastic bottle leak detection machine

Abstract

The utility model discloses a leak hunting machine for finished plastic bottles, which is characterized in that the leak hunting machine is provided with a conveying belt for conveying the plastic bottles, two sides of the conveying belt are provided with limiting frames for limiting the plastic bottles, and a limiting channel for only allowing a single plastic bottle to pass through is formed between the two limiting frames. The leak hunting machine is provided with a detection head used for injecting air into the plastic bottle. The plastic bottle leakage detection device is characterized in that the leakage detection machine is provided with a positioning mechanism used for positioning a plastic bottle below the detection head, and the plc controller is connected with an alarm lamp through a time-delay relay. The plastic bottle leak hunting machine has a long-time alarm warning function, so that a worker can conveniently walk to the plastic bottle leak hunting machine which gives out an alarm sound in time and carry out manual detection in time, and defective products are prevented from being mixed into qualified finished products; and in addition, the plastic bottles of different specifications can be positioned, and therefore high universality is achieved.

Description

Technical Field

[0001] This utility model relates to the technical field of leak testing machines for plastic bottles, specifically a leak testing machine for finished plastic bottles. Background Technology

[0002] Plastic bottles are widely used as liquid containers due to their light weight and low price. While current plastic bottle production processes utilize mechanization to achieve high output, the thin walls of plastic bottles make them prone to leaks during processing. The function of a plastic bottle leak detector is to inflate the plastic bottles with air, rejecting leaking or defective bottles to ensure product quality. The plastic bottles move along a conveyor belt to their corresponding detection heads, which pressurize and blow air into the bottles, detecting the internal air pressure. Bottles with abnormal internal pressure are considered defective and are rejected by the rejection device, thus ensuring product quality.

[0003] Existing side-leakage machines have shortcomings in production. Typically, upon detecting a defective plastic bottle, the equipment immediately rejects it, emitting a "beep" alarm and flashing an alarm light, but this lasts only 0.5 seconds. However, in reality, multiple plastic bottle production machines operate simultaneously in the workshop, resulting in significant noise levels. Often, by the time workers hear the alarm and check, the alarm light has already gone out, making it impossible to immediately identify which machine triggered the alarm while the equipment continues operating. If the cause of the defective bottle is not identified promptly, it could lead to defective bottles being mixed with qualified bottles in subsequent production, reducing the yield rate and causing considerable inconvenience to later stages. Furthermore, the positioning mechanism of existing side-leakage machines suffers from poor versatility, making it inconvenient to position and fix plastic bottles of different sizes. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a leak detector for finished plastic bottles.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0006] This utility model discloses a leak detection machine for finished plastic bottles, comprising a leak detection machine, a conveyor belt for transporting plastic bottles, and limiting frames on both sides of the conveyor belt for limiting the plastic bottles. A limiting channel is formed between the two limiting frames for allowing only a single plastic bottle to pass through. The leak detection machine also includes a detection head for injecting air into the plastic bottle. The key feature is that a positioning mechanism for positioning the plastic bottle is located below the detection head.

[0007] The detection head includes a lifting frame, the bottom of which is provided with a sealing block corresponding to the bottle mouth of the plastic bottle, and the bottom of the sealing block is provided with an air injection pipe. The sealing block is also provided with a pressure gauge for detecting the internal air pressure of the plastic bottle being tested. The leak detector is provided with a PLC controller, and the PLC controller is connected to an alarm light via a time delay relay.

[0008] As a preferred embodiment of this utility model, the PLC controller controls all electrical switches in the equipment.

[0009] As a preferred technical solution of this utility model, the bottom of the sealing block is provided with a rubber sealing layer to seal the connection between the bottle mouth and the sealing block.

[0010] As a preferred technical solution of this utility model, the positioning mechanism includes fixed frames mounted on the leak detector and located on both sides of the conveyor. Each fixed frame is equipped with a positioning cylinder, and a Y-shaped fixed frame is installed at the telescopic end of each positioning cylinder. The two Y-shaped fixed frames are arranged facing each other and are not at the same horizontal height; a positioning cavity is formed between the two Y-shaped fixed frames.

[0011] As a preferred embodiment of this utility model, the fixed frame is provided with a transverse adjustment frame, and the positioning cylinder is installed on the transverse adjustment frame. The transverse adjustment frame is used to adjust the size of the positioning cavity between the two Y-shaped fixed frames.

[0012] As a preferred technical solution of this utility model, the transverse adjustment frame includes a base plate disposed on a fixed frame, a lead screw and a guide rod disposed in parallel on the base plate, a sliding block disposed on the lead screw and a slider disposed on the guide rod and moving along the guide rod, a positioning plate disposed between the slider and the sliding block, a positioning cylinder mounted on the positioning plate, and a locking mechanism disposed between the slider and the guide rod.

[0013] As a preferred technical solution of this utility model, the locking mechanism includes a straight rack disposed on the optical rod, the slider is provided with a limiting cavity, and a movable block that moves along the limiting cavity is provided in the limiting cavity, and the movable block is provided with teeth that mesh with the straight rack, and a threaded cylinder is installed on the slider at the outer port of the limiting cavity, and a screw with its end rotatably connected to the movable block via a rotating component is installed in the threaded cylinder.

[0014] The beneficial effects of this utility model are:

[0015] This type of leak detector for finished plastic bottles injects gas at a certain pressure into the bottle through an injection pipe. The pressure change inside the bottle is then observed using a pressure gauge. The rate of pressure change determines whether the bottle is leaking. When a leak is detected, the PLC controller activates an alarm signal via a time-delay relay, providing a relatively long alarm duration. This allows staff to quickly approach the leak detector and perform manual inspection, preventing defective products from being mixed with qualified products. Furthermore, the positioning mechanism is adjustable via a horizontal adjustment frame, allowing for adjustment of the size of the positioning cavity between the two Y-shaped frames. This enables positioning for plastic bottles of different sizes, providing strong versatility. The slider is locked via a rack and pinion mechanism, preventing the screw from rotating during cylinder extension and retraction, thus avoiding misalignment. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0017] Figure 1 This is a structural schematic diagram of a leak tester for finished plastic bottles according to this utility model;

[0018] Figure 2 This is a schematic diagram of the horizontal adjustment frame of a leak tester for finished plastic bottles according to this utility model;

[0019] Figure 3 This is a diagram showing the arrangement of the Y-shaped frame of a leak tester for finished plastic bottles according to this utility model.

[0020] Figure 4 This is a schematic diagram of the locking mechanism of a leak tester for finished plastic bottles according to this utility model;

[0021] Figure 5 This is a schematic diagram of the time delay relay connection of a leak tester for finished plastic bottles according to this utility model;

[0022] Figure 6 This is a schematic diagram of the air injection pipe of a leak tester for finished plastic bottles according to this utility model.

[0023] In the diagram: 1. Leak detector; 2. Conveyor belt; 3. Limiting frame; 4. Detection head; 5. Positioning mechanism; 6. Lifting frame; 7. Sealing block; 8. Pressure gauge; 9. Air injection pipe; 10. PLC controller; 11. Time delay relay; 12. Fixing frame; 13. Positioning cylinder; 14. Y-shaped fixing frame; 15. Lateral adjustment frame; 16. Base plate; 17. Lead screw; 18. Smooth rod; 19. Sliding block; 20. Sliding block; 22. Positioning plate; 23. Straight rack; 24. Limiting cavity; 25. Movable block; 26. Tooth; 27. Threaded cylinder; 28. Screw; 29. ​​Alarm. Detailed Implementation

[0024] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0025] Example: Figure 1-6 As shown, this utility model discloses a leak detection machine for finished plastic bottles, including a leak detection machine 1. The leak detection machine 1 is equipped with a conveyor belt 2 for conveying plastic bottles. Limiting frames 3 are provided on both sides of the conveyor belt 2 for limiting the plastic bottles, and a limiting channel is formed between the two limiting frames 3 for allowing only a single plastic bottle to pass through. The leak detection machine 1 is also equipped with a detection head 4 for injecting air into the plastic bottle. The leak detection machine 1 is characterized by having a positioning mechanism 5 for positioning the plastic bottle below the detection head 4.

[0026] The detection head 4 includes a lifting frame 6. The bottom of the lifting frame 6 has sealing blocks 7 that correspond one-to-one with the bottle openings of the plastic bottles. The bottom of each sealing block 7 has an injection pipe 9, and the sealing block 7 also has a pressure gauge 8 for detecting the internal air pressure of the tested plastic bottle. The leak detector 1 is equipped with a PLC controller 10, which is connected to an alarm light 29 via a time-delay relay 11. Gas of a certain pressure is injected into the plastic bottle through the injection pipe 9, and the pressure change inside the plastic bottle is observed through the pressure gauge 8. The rate of pressure change determines whether the plastic bottle is leaking. When a leak occurs, the PLC controller 10 controls the alarm light to emit an alarm signal via the time-delay relay 11. This provides a relatively long alarm warning, allowing staff to promptly approach the leak detector 1 that emitted the alarm and perform manual inspection, preventing defective products from being mixed with qualified finished products.

[0027] The gas injection pipe is connected to the gas supply equipment of the leak detector 1 to supply gas. The gas supply equipment is connected to the PLC controller and controlled by the PLC controller. The leak detector 1 is also equipped with a position sensor to detect the position of the plastic bottle. When the plastic bottle enters the station of the positioning mechanism 5, the positioning mechanism 5 is used to position the plastic bottle.

[0028] The PLC controller 10 controls all electrical switches in the equipment.

[0029] The bottom of the sealing block 7 is provided with a rubber sealing layer to seal the connection between the bottle mouth and the sealing block 7, thus providing a better sealing effect.

[0030] The positioning mechanism 5 includes fixed frames 12 mounted on the leak detector 1 and located on both sides of the conveyor. Each fixed frame 12 is equipped with a positioning cylinder 13. Each positioning cylinder 13 has a Y-shaped fixed frame 14 mounted on its telescopic end. The two Y-shaped fixed frames 14 are arranged facing each other and are not at the same horizontal height. A positioning cavity is formed between the two Y-shaped fixed frames 14, which facilitates the centering and positioning of the plastic bottle and facilitates docking with the sealing head.

[0031] The fixed frame 12 is provided with a horizontal adjustment frame 15, and the positioning cylinder 13 is installed on the horizontal adjustment frame 15. The horizontal adjustment frame 15 is used to adjust the size of the positioning cavity between the two Y-shaped fixed frames 14, so that it can be positioned for plastic bottles of different specifications, thus having strong versatility.

[0032] The lateral adjustment frame 15 includes a base plate 16 mounted on the fixed frame 12. The base plate 16 has a lead screw 17 and a guide rod 18 arranged in parallel. The lead screw 17 has a sliding block 19 that moves along it. The guide rod 18 has a slider 20 that moves along it. A positioning plate 22 is provided between the slider 20 and the sliding block 19. A positioning cylinder 13 is mounted on the positioning plate 22, and a locking mechanism is provided between the slider 20 and the guide rod 18. The lateral adjustment frame 15 is used to adjust the positioning mechanism 5, facilitating the adjustment of the size of the positioning cavity between the two Y-shaped fixed frames 14. This allows for positioning of plastic bottles of different specifications, providing strong versatility. The slider 20 is locked by the engagement of a rack and pinion 23 and teeth 26, preventing the screw 28 from rotating during cylinder extension and retraction, thus avoiding displacement.

[0033] The locking mechanism includes a rack 23 mounted on the light rod 18, a slider 20 having a limiting cavity 24, a movable block 25 moving along the limiting cavity 24 within the limiting cavity 24, teeth 26 engaging with the rack 23 on the movable block 25, and a threaded cylinder 27 installed at the outer port of the slider 20 at the limiting cavity 24, with a screw 28 rotatably connected to the movable block 25 via a rotating component inside the threaded cylinder 27.

[0034] During operation, gas at a certain pressure is injected into the plastic bottle through the injection pipe 9. The pressure change inside the bottle is then observed through the pressure gauge 8. The rate of pressure change determines whether the bottle is leaking. When a leak occurs, the PLC controller 10 activates an alarm signal via a time-delay relay 11, providing a prolonged alarm warning. This allows staff to quickly approach the leak detector 1 and perform manual inspection, preventing defective products from being mixed with qualified finished products. Furthermore, the positioning mechanism 5 is adjusted using a horizontal adjustment frame 15, allowing for easy adjustment of the size of the positioning cavity between the two Y-shaped frames 14. This enables positioning for plastic bottles of different sizes, providing strong versatility. The slider 20 is locked by the engagement of a rack and pinion 23 and teeth 26, preventing the screw 28 from rotating during cylinder extension and retraction, thus avoiding misalignment.

[0035] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A leak tester for finished plastic bottles, comprising a leak tester (1), wherein the leak tester (1) is provided with a conveyor belt (2) for conveying plastic bottles, and limiting frames (3) for limiting the plastic bottles are provided on both sides of the conveyor belt (2), and a limiting channel for allowing only a single plastic bottle to pass through is formed between the two limiting frames (3), and the leak tester (1) is provided with a detection head (4) for injecting air into the plastic bottle; characterized in that: The leak detector (1) has a positioning mechanism (5) located below the detection head (4) for positioning the plastic bottle. The detection head (4) includes a lifting frame (6), the bottom of the lifting frame (6) is provided with a sealing block (7) corresponding to the bottle mouth of the plastic bottle, and the bottom of the sealing block (7) is provided with an air injection pipe (9), and the sealing block (7) is also provided with a pressure gauge (8) for detecting the internal air pressure of the plastic bottle being tested. The leak detector (1) is provided with a PLC controller (10), and the PLC controller (10) is connected to an alarm light (29) via a time delay relay (11).

2. The leak detector for finished plastic bottles according to claim 1, characterized in that, The PLC controller (10) controls all electrical switches in the equipment.

3. The leak detector for finished plastic bottles according to claim 1, characterized in that, The bottom of the sealing block (7) is provided with a rubber sealing layer to seal the connection between the bottle mouth and the sealing block (7).

4. A leak detector for finished plastic bottles according to claim 2, characterized in that, The positioning mechanism (5) includes a fixed frame (12) on the leak detector (1) and located on both sides of the conveyor. Each fixed frame (12) is provided with a positioning cylinder (13). Each positioning cylinder (13) has a Y-shaped fixed frame (14) installed at its telescopic end. The two Y-shaped fixed frames (14) are arranged facing each other and are not at the same horizontal height. A positioning cavity is formed between the two Y-shaped fixed frames (14).

5. A leak detector for finished plastic bottles according to claim 4, characterized in that, The fixed frame (12) is provided with a transverse adjustment frame (15), and the positioning cylinder (13) is installed on the transverse adjustment frame (15). The transverse adjustment frame (15) is used to adjust the size of the positioning cavity between the two Y-shaped fixed frames (14).

6. A leak detector for finished plastic bottles according to claim 5, characterized in that, The horizontal adjustment frame (15) includes a base plate (16) disposed on a fixed frame (12). The base plate (16) is provided with a lead screw (17) and a guide rod (18) arranged in parallel. The lead screw (17) is provided with a sliding block (19) that moves along the lead screw (17). The guide rod (18) is provided with a slider (20) that moves along the guide rod (18). A positioning plate (22) is provided between the slider (20) and the sliding block (19). The positioning cylinder (13) is mounted on the positioning plate (22). A locking mechanism is provided between the slider (20) and the guide rod (18).

7. A leak detector for finished plastic bottles according to claim 6, characterized in that, The locking mechanism includes a rack (23) mounted on a light rod (18), a slider (20) having a limiting cavity (24), a movable block (25) moving along the limiting cavity (24) inside the limiting cavity (24), teeth (26) meshing with the rack (23) on the movable block (25), and a threaded cylinder (27) installed at the outer port of the slider (20) located in the limiting cavity (24), and a screw (28) with its end rotatably connected to the movable block (25) via a rotating component inside the threaded cylinder (27).

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