Air tightness detection device for low-pressure plastic bag

Abstract

The utility model discloses an air tightness detection device for a low-pressure plastic bag, which relates to the field of low-pressure plastic bag detection equipment and comprises an equipment main body frame, a base is arranged at the bottom of the equipment main body frame, and a display panel is arranged in the middle of the top of the equipment main body frame. An operation table is arranged in the middle of the top of the base, a working frame is arranged at the top of the operation table, a cover plate is arranged at the upper end of the working frame, a lower pressing plate is arranged at the bottom of the cover plate, a transverse rail is arranged at the top of the working frame, a containing groove is formed in the top of the transverse rail, and the lower end of the exterior of an air cylinder is sleeved with a sleeve block. According to the air tightness detection device for the low-pressure plastic bags, through linkage of the lower pressing plate, the guide rod, the push piece and the like, the air suction process of the air inlet pipe and the air conveying process of the air outlet pipe can be accurately controlled, the inflation amount and other characteristic parameters can be flexibly adjusted, the air tightness detection requirements of the low-pressure plastic bags of different specifications are met, and the detection pertinence is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of low-pressure plastic bag testing equipment, specifically a device for testing the airtightness of low-pressure plastic bags. Background Technology

[0002] Plastic bag airtightness testing equipment is used to detect whether plastic bags have gas leakage problems. It is crucial in plastic packaging production and quality inspection. By simulating environmental pressure and other conditions, it determines the sealing performance of plastic bags. However, general-purpose plastic bag airtightness testing equipment suffers from limitations such as single testing parameters and poor controllability. It is difficult to flexibly adjust key parameters such as inflation volume and inflation pressure to adapt to the testing needs of low-pressure plastic bags of different sizes and thicknesses. This results in insufficiently specific test results and an inability to accurately measure the airtightness of the product.

[0003] Publication number CN222439054U describes an airtightness testing device for low-pressure plastic bags, employing a rotating mechanism, a sealing mechanism, and a moving mechanism. The rotating mechanism, driven by a servo motor, rotates the support frame and testing frame, immersing the bag in the testing liquid to observe air bubbles and pressure values. The sealing mechanism, driven by a servo motor, uses a threaded rod, slider, and connecting rod to bring the sealing plate into contact with the bag opening. The moving mechanism uses a hydraulic rod to rotate a crossbar, allowing the inflation head to insert into the bag opening. This device attempts to control the testing process from different dimensions through the coordinated operation of multiple mechanisms.

[0004] However, the gas input mainly relies on simple inflation through the inflation port, without precise and flexible control of parameters such as gas flow rate and pressure during the inflation process. It is difficult to dynamically adjust characteristic parameters according to the actual situation of the plastic bag, and cannot fully adapt to diverse detection scenarios.

[0005] Therefore, in order to address the shortcomings of the existing technology, an airtightness testing device for low-pressure plastic bags was proposed. Utility Model Content

[0006] The purpose of this invention is to provide an airtightness testing device for low-pressure plastic bags to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution: an airtightness testing device for low-pressure plastic bags, comprising: a main frame of the device, a base provided at the bottom of the main frame of the device, and a display panel provided at the middle of the top of the main frame of the device;

[0008] An operating table is provided at the middle of the top of the base. A work frame is provided on the top of the operating table. A cover plate is provided at the upper end of the work frame. A pressure plate is provided at the bottom of the cover plate. A horizontal rail is provided at the top of the work frame. A placement groove is provided at the top of the horizontal rail.

[0009] A sleeve block is fitted around the lower end of the cylinder. A piston cylinder is provided on the inner side of one end of the sleeve block. A push plate is provided on the inner side of the piston cylinder. A guide rod is provided on the top of the push plate. An air outlet pipe is provided through the outside of the piston cylinder. An air inlet pipe is provided on the other side of the outside of the piston cylinder.

[0010] Furthermore, a one-way valve is provided at the connection between the air outlet pipe, the cover plate, and the piston cylinder.

[0011] Furthermore, the sleeve is fixedly connected to the outside of the cylinder.

[0012] Furthermore, the top of the guide rod is fixedly connected to the bottom of the lower pressure plate.

[0013] Furthermore, the lower pressure plate can move up and down outside the cylinder.

[0014] Furthermore, when the lower pressure plate moves, it can drive the guide rod to move along the axis of the cylinder.

[0015] Furthermore, one end of the vent pipe extends laterally through the interior of the placement groove.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] 1. This utility model can precisely control the process of air intake and air delivery through the linkage of the pressure plate, guide rod, and push plate, so that characteristic parameters such as inflation volume can be flexibly adjusted to meet the air tightness testing needs of low-pressure plastic bags of different specifications and improve the testing accuracy.

[0018] 2. This utility model ensures the stability of components such as piston cylinder by fixing the sleeve block to the cylinder; the one-way valve and other structures ensure unidirectional gas flow, and the coordinated operation of all components simplifies the testing process and improves the operating efficiency and airtightness testing reliability of the device. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the low-pressure plastic bag airtightness testing device of this utility model;

[0020] Figure 2 This is an enlarged view of part A (partial structure) of the device of this utility model;

[0021] Figure 3 This is a side view of the device of this utility model (including the layout of the newly added components).

[0022] Figure 4 This is an enlarged view of part B (partial detail) of the device of this utility model;

[0023] Figure 5 This is a schematic diagram of the overall structure of the device from another perspective of this utility model.

[0024] In the diagram: 1. Main frame of the equipment; 2. Lower pressure plate; 3. Placement slot; 4. Base; 5. Operating table; 6. Cylinder; 7. Working frame; 8. Cover plate; 9. Display panel; 10. Guide rod; 11. Push plate; 12. Piston cylinder; 13. Air inlet pipe; 14. Sleeve block; 15. Air outlet pipe; 16. Horizontal rail. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] like Figures 1-5 As shown, an airtightness testing device for low-pressure plastic bags includes: a main frame 1, a base 4 at the bottom of the main frame 1, and a display panel 9 at the middle of the top of the main frame 1.

[0027] An operating table 5 is provided at the middle of the top of the base 4. A work rack 7 is provided on the top of the operating table 5. A cover plate 8 is provided at the upper end of the work rack 7. A pressure plate 2 is provided at the bottom of the cover plate 8. A horizontal rail 16 is provided on the top of the work rack 7. A placement groove 3 is provided on the top of the horizontal rail 16.

[0028] A sleeve block 14 is fitted onto the lower end of the cylinder 6. A piston cylinder 12 is installed inside one end of the sleeve block 14. A pusher plate 11 is installed inside the piston cylinder 12. A guide rod 10 is installed on the top of the pusher plate 11. An exhaust pipe 15 is installed through the outside of the piston cylinder 12. An intake pipe 13 is installed on the other side of the outside of the piston cylinder 12.

[0029] Example 1: The valve structure of the inlet pipe 13 and outlet pipe 15 is optimized by replacing the original one-way valve with an adjustable flow solenoid valve. A flow regulation module is added to the equipment control system, which can accurately set the air extraction rate of the inlet pipe 13 and the air delivery flow rate of the outlet pipe 15 according to parameters such as the thickness and volume of the plastic bag. At the same time, a pressure sensor is added inside the piston cylinder 12 to monitor the air pressure inside the cylinder in real time and feed it back to the control system to automatically adjust the moving speed of the pusher 11 to ensure stable gas input. In this way, the optimized device can more accurately control gas parameters and adapt to more diverse low-pressure plastic bag detection scenarios. By improving the valve and adding sensor control, the gas parameter regulation is strengthened and the detection accuracy is improved.

[0030] Example 2: The original piston cylinder 12, push plate 11, and other structures are replaced with a micro air pump assembly. The micro air pump is fixed to the sleeve block 14 and connected to the lower pressure plate 2 through the guide rod 10. When the lower pressure plate 2 moves down, it triggers the micro air pump to start and directly inflate the placement slot 3. The air pump output end is equipped with dual sensors for gas flow and pressure to provide real-time feedback on the inflation status. Compared with the original structure, the micro air pump has higher inflation efficiency and can independently control the inflation process without being limited by the mechanical movement of the push plate 11. At the same time, the air pump can flexibly adjust the inflation mode, such as pulse inflation or continuous inflation, according to the testing requirements to adapt to different air tightness testing standards. By replacing the inflation components, the inflation method and control flexibility are optimized, and the practicality of the device is improved.

[0031] Working Principle: When using this airtightness testing device for low-pressure plastic bags, first place the low-pressure plastic bag to be tested in the placement slot 3 on the operating table 5. When the device operates, the cylinder 6 drives the lower pressure plate 2 to move downwards. Because the top of the guide rod 10 is fixedly connected to the bottom of the lower pressure plate 2, the downward movement of the lower pressure plate 2 causes the guide rod 10 to move downwards synchronously. The guide rod 10 then drives the push plate 11 to move within the piston cylinder 12. The air inlet pipe 13 draws external gas into the piston cylinder 12, and the gas in the piston cylinder 12 is output to the placement slot 3 through the air outlet pipe 15. Since there is a plastic bag in the placement slot 3, the output gas inflates the outside of the plastic bag. By controlling the movement of the lower pressure plate 2, the gas input is changed. Using the inflation volume as a characteristic parameter, combined with feedback from components such as the display panel 9, the airtightness of the plastic bag is detected, and it is determined whether there is any leakage.

[0032] The embodiments of this utility model are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the utility model to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical applications of this utility model, and to enable those skilled in the art to understand this utility model and design various embodiments with various modifications suitable for a particular purpose.

Claims

1. An airtightness testing device for low-pressure plastic bags, comprising: The main frame of the equipment (1) is characterized in that a base (4) is provided at the bottom of the main frame of the equipment (1), and a display panel (9) is provided at the middle of the top of the main frame of the equipment (1). An operating table (5) is provided at the middle of the top of the base (4). A work frame (7) is provided on the top of the operating table (5). A cover plate (8) is provided at the upper end of the work frame (7). A pressure plate (2) is provided at the bottom of the cover plate (8). A horizontal rail (16) is provided on the top of the work frame (7). A placement groove (3) is provided on the top of the horizontal rail (16). A sleeve block (14) is fitted on the lower end of the cylinder (6). A piston cylinder (12) is provided on the inner side of one end of the sleeve block (14). A push plate (11) is provided on the inner side of the piston cylinder (12). A guide rod (10) is provided on the top of the push plate (11). An exhaust pipe (15) is provided through the outside of the piston cylinder (12). An intake pipe (13) is provided on the other side of the outside of the piston cylinder (12).

2. The airtightness testing device for low-pressure plastic bags according to claim 1, characterized in that, A one-way valve is provided at the connection between the air outlet pipe (15), the cover plate (8) and the piston cylinder (12).

3. The airtightness testing device for low-pressure plastic bags according to claim 1, characterized in that, The sleeve (14) is fixedly connected to the outside of the cylinder (6).

4. The airtightness testing device for low-pressure plastic bags according to claim 1, characterized in that, The top of the guide rod (10) is fixedly connected to the bottom of the pressure plate (2).

5. The airtightness testing device for low-pressure plastic bags according to claim 1, characterized in that, The lower pressure plate (2) can move up and down outside the cylinder (6).

6. The airtightness testing device for low-pressure plastic bags according to claim 1, characterized in that, When the lower pressure plate (2) moves, it can drive the guide rod (10) to move along the axis of the cylinder (6).

7. The airtightness testing device for low-pressure plastic bags according to claim 1, characterized in that, One end of the vent pipe (15) extends laterally through the interior of the placement slot (3).

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