A dead volume reducing overwrap seal detection apparatus

Abstract

The utility model provides a kind of outer package sealing detection device for reducing dead volume, including test bin, piston assembly and differential pressure sensor;Sealed containing cavity is provided in the test bin, the containing cavity is used to place sample to be measured, and piston hole is opened in one side wall of the test bin, which is communicated with the outside world;The piston assembly includes piston head, piston rod and driving mechanism, the piston head is movably installed in the piston hole, the piston head is connected the driving mechanism by piston rod, and the containing cavity is pumped under the action of the driving mechanism;The differential pressure sensor is used to detect the negative pressure parameter change of containing cavity.The device has the advantages of reducing dead volume and making sealing detection calculation more accurate.

Description

Technical Field

[0001] This utility model relates to the field of cigarette outer packaging sealing test technology, specifically, to an outer packaging sealing test device that reduces dead volume. Background Technology

[0002] The sealing test of cigarette outer packaging usually refers to the sealing test of cigarette packs. It is of great significance because various quality parameters during the storage, transportation, sale and preservation of cigarettes are closely related to the sealing performance.

[0003] Currently, the sealing performance of cigarette packaging is mainly tested by pressure change. The basic principle is to place the cigarette packaging in a closed cavity, evacuate the cavity and maintain a negative pressure state, and observe the change in the cavity pressure. If there is a change, the sealing performance of the packaging can be judged.

[0004] Further research often requires calculations based on specific cavity parameters, negative pressure parameters, changes, and packaging parameters. As the research becomes more refined, new problems are discovered during actual operation.

[0005] All the components and cavities required for vacuuming are connected by pipes. The pipes themselves also have a certain negative pressure space. The longer the pipe path, the greater the impact on the calculation process. These spaces are called "dead volumes". Shortening the pipes can optimize the calculation results, but interference still exists.

[0006] Minimize the interference caused by "dead volume" as much as possible; this is an urgent problem that needs to be solved.

[0007] In order to solve the above problems, people have been seeking an ideal technological solution. Utility Model Content

[0008] The purpose of this invention is to address the shortcomings of existing technologies by providing a method that reduces dead volume and makes sealing performance calculations more accurate.

[0009] To achieve the above objectives, the technical solution adopted by this utility model is: an outer packaging sealing detection device for reducing dead volume, comprising a test chamber, a piston assembly, and a differential pressure sensor;

[0010] The test chamber is equipped with a sealed receiving cavity for placing the sample to be tested. A piston hole communicating with the outside is opened in one side wall of the test chamber.

[0011] The piston assembly includes a piston head, a piston rod, and a drive mechanism. The piston head is movably installed in the piston hole. The piston head is connected to the drive mechanism through the piston rod and evacuates the receiving cavity under the action of the drive mechanism.

[0012] The differential pressure sensor is used to detect changes in the negative pressure parameter of the containment cavity.

[0013] Based on the above, the volume of the cavity in the test chamber is greater than the volume of the sample to be tested.

[0014] Based on the above, the effective suction volume of the piston assembly consisting of the piston bore, piston head, and piston rod is greater than the volume of the accommodating cavity in the test chamber.

[0015] Based on the above, the effective suction volume of the piston assembly consisting of the piston hole, piston head, and piston rod is 2-5 times the volume of the accommodating cavity in the test chamber.

[0016] Based on the above, an anti-blocking groove is provided on the inner side of the side wall where the piston hole is opened.

[0017] Based on the above, the anti-blocking air grooves are arranged in a longitudinal and transverse manner on the side wall.

[0018] Based on the above, the test chamber includes a main body and a top cover, with the top of the main body being open and fitted with a sealing ring.

[0019] Based on the above, the top cover is driven by a linear actuator for lifting and lowering, used for closing and opening the test chamber.

[0020] Based on the above, the piston rod is driven by an electric lead screw mechanism.

[0021] Based on the above, the test chamber is made of transparent material.

[0022] This invention has substantial features and advancements compared to existing technologies. Specifically, this invention directly opens a hole in the side wall of the test chamber as a piston hole, with a piston head and piston rod configured inside and a drive mechanism configured outside, so that the piston hole is directly connected to the receiving cavity of the test chamber, eliminating the need for pipeline connections. This significantly reduces the proportion of "dead volume," making the internal volume calculation of the piston hole relatively easy. This makes it more reliable for refined sealing performance testing and calculation, thereby improving testing accuracy.

[0023] Furthermore, due to the effects of the direct suction method, the sample under test may be forced to adhere to the piston hole, blocking it and affecting the degree of negative pressure. Therefore, anti-blockage grooves are set on the corresponding side wall to avoid blockage. Attached Figure Description

[0024] Figure 1This is a schematic diagram of the outer packaging sealing detection device for reducing dead volume in this utility model.

[0025] Figure 2 This is a cross-sectional view of the test chamber and piston assembly in this utility model.

[0026] In the figure: 1. Test chamber; 2. Piston assembly; 3. Differential pressure sensor; 4. Sample to be tested; 11. Receiving cavity; 12. Piston hole; 13. Top cover; 14. Linear actuator; 21. Piston head; 22. Piston rod; 23. Drive mechanism. Detailed Implementation

[0027] The technical solution of this utility model will be further described in detail below through specific embodiments.

[0028] like Figure 1 and Figure 2 As shown, an outer packaging seal detection device for reducing dead volume includes a test chamber 1, a piston assembly 2, and a differential pressure sensor 3.

[0029] The test chamber 1 is provided with a sealed receiving cavity 11, which is used to place the sample 4 to be tested. A piston hole 12 communicating with the outside is opened in one side wall of the test chamber 1.

[0030] Specifically, in this embodiment, the test chamber 1 includes a main body and a top cover 13. The top of the main body is open and a sealing ring is provided. The top cover 13 is driven by a linear actuator 14 for lifting and lowering, and is used to close and open the test chamber 1.

[0031] The piston assembly 2 includes a piston head 21, a piston rod 22, and a drive mechanism 23. The piston head 21 is movably installed in the piston hole 12. The piston head 21 is connected to the drive mechanism 23 through the piston rod 22, and the drive mechanism 23 evacuates the receiving cavity 11 under the action of the receiving mechanism 23. In this embodiment, the drive mechanism 23 is an electric lead screw assembly. The electric lead screw assembly usually has a self-locking capability, which can lock the position after controlling the piston rod 22 to move to a set stroke, thereby ensuring that the negative pressure in the receiving cavity 11 is constant.

[0032] The differential pressure sensor 3 is used to detect changes in the negative pressure parameter of the containment cavity 11. One end of the sensor is connected to the containment cavity 11 and the other end is connected to the atmosphere, serving as the main means of obtaining the negative pressure parameter.

[0033] In terms of volume design, the volume of the cavity 11 in the test chamber 1 is larger than the volume of the sample 4 to be tested, and the single effective suction volume of the piston assembly consisting of the piston hole 12, the piston head 21 and the piston rod 22 is larger than the volume of the cavity 11 in the test chamber.

[0034] The single effective suction volume refers to the volume of the piston hole 12 that the piston head 21 passes through after moving from the innermost side to the outside to the set stroke. In a preferred embodiment, the single effective suction volume of the piston assembly consisting of the piston hole, piston head and piston rod is 2-5 times the volume of the accommodating cavity in the test chamber.

[0035] In other embodiments, anti-blocking grooves are provided on the inner side of the sidewall where the piston hole is formed, and the anti-blocking grooves are arranged in a longitudinal and transverse manner on the sidewall.

[0036] In other embodiments, the test chamber is made of a transparent material to facilitate observation of the internal conditions.

[0037] Working principle explanation:

[0038] First, open the top cover 13, then put the sample to be tested into the receiving cavity 11, and then close the top cover 13 to ensure the sealing of the receiving cavity 11.

[0039] Then, the piston assembly is controlled to evacuate the cavity, creating a negative pressure environment. Once the set level is reached, the process stops, and the positions of the piston head and piston rod remain unchanged, maintaining a constant negative pressure environment in the cavity 11.

[0040] Then observe the changes in the reading of differential pressure sensor 3. Based on the changes in the reading, determine whether there is a sealing problem. For example, if the internal negative pressure weakens, it indicates that the sample under test is leaking, causing air from inside the packaging to enter the containment cavity; if the internal negative pressure remains stable, it indicates that the sample under test is not leaking.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it; although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this utility model or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the technical solution claimed by this utility model.

Claims

1. A device for detecting the sealing of outer packaging to reduce dead volume, characterized in that: Includes a test chamber, piston assembly, and differential pressure sensor; The test chamber is equipped with a sealed receiving cavity for placing the sample to be tested. A piston hole communicating with the outside is opened in one side wall of the test chamber. The piston assembly includes a piston head, a piston rod, and a drive mechanism. The piston head is movably installed in the piston hole. The piston head is connected to the drive mechanism through the piston rod and evacuates the receiving cavity under the action of the drive mechanism. The differential pressure sensor is used to detect changes in the negative pressure parameter of the containment cavity.

2. The outer packaging seal detection device for reducing dead volume according to claim 1, characterized in that: The volume of the chamber in the test chamber is greater than the volume of the sample to be tested.

3. The outer packaging seal detection device for reducing dead volume according to claim 1 or 2, characterized in that: The effective suction volume of the piston assembly, consisting of the piston bore, piston head, and piston rod, is greater than the volume of the containment cavity in the test chamber.

4. The outer packaging seal detection device for reducing dead volume according to claim 3, characterized in that: The effective suction volume of the piston assembly, consisting of the piston bore, piston head, and piston rod, is 2-5 times the volume of the accommodating cavity in the test chamber.

5. The outer packaging seal detection device for reducing dead volume according to claim 1, characterized in that: An anti-blocking groove is provided on the inner side of the side wall where the piston hole is opened.

6. The outer packaging seal detection device for reducing dead volume according to claim 5, characterized in that: The anti-blocking air grooves are arranged in a longitudinal and transverse manner on the side wall.

7. The outer packaging seal detection device for reducing dead volume according to claim 1, characterized in that: The test chamber includes a main body and a top cover, with the top of the main body being open and fitted with a sealing ring.

8. The outer packaging seal detection device for reducing dead volume according to claim 7, characterized in that: The top cover is driven by a linear actuator that moves up and down, and is used to close and open the test chamber.

9. The outer packaging seal detection device for reducing dead volume according to claim 1, characterized in that: The piston rod is driven by an electric lead screw mechanism.

10. The outer packaging seal detection device for reducing dead volume according to claim 1, characterized in that: The test chamber is made of transparent material.

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