Pressure-maintaining cover opening detector

Abstract

A detection mechanism comprises a detection assembly and an air storage tank, the detection assembly comprises an installation seat, a limiting seat, an air cylinder, a pressure maintaining inner cavity and a sealing piece, a first hole is formed in the installation seat, the limiting seat is installed on the installation seat, a second hole is formed in the top of the limiting seat, the position of the second hole corresponds to the position of the first hole, and the air cylinder is installed in the air storage tank. The output end of the air cylinder is connected with the pressure maintaining inner cavity, the pressure maintaining inner cavity slides in the first hole, the top of the pressure maintaining inner cavity is open, the sealing piece is installed at the top opening of the pressure maintaining inner cavity, and an air outlet of the air storage tank is communicated with the air cylinder and the pressure maintaining inner cavity. According to the technical scheme, the zip-top can is connected with the pressure maintaining inner cavity through the sealing piece, and the pressure maintaining inner cavity serves as a zip-top can body. Therefore, air can be supplied to the pressure maintaining inner cavity through the air storage tank to simulate the pressure after the zip-top can is filled with contents, opening detection is carried out on the zip-top can under the condition, the detection accuracy is guaranteed, and therefore the situation that opening is unqualified during follow-up use, and actual use is affected can be avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to a zip-top cap opening detection technical field, especially a kind of pressure maintaining opening detection instrument. BACKGROUND

[0002] In order to guarantee the opening performance of zip-top cap, the actual opening performance of zip-top cap needs to be verified by sampling inspection to determine whether the product meets the requirements of normal opening. The opening detection of zip-top cap is generally only simple simulation of the opening detection after the sterilization process of client end.

[0003] However, in addition to the influence of sterilization temperature and actual factors, the pressure of carbon dioxide or liquid nitrogen in the content after filling also has a great influence on the opening performance of zip-top cap. Therefore, zip-top cap may be normally opened after sterilization process, but may be unqualified after filling, which affects actual use. UTILITY MODEL CONTENT

[0004] In view of the above problems, the present application provides a pressure maintaining opening detection instrument to solve the technical problem of unqualified opening after filling, which affects actual use.

[0005] To achieve the above purpose, the inventor provides a pressure maintaining opening detection instrument, which comprises a rack and a detection mechanism. The detection mechanism is installed on the rack. The detection mechanism comprises a detection assembly and a gas storage tank. The detection assembly comprises a mounting seat, a limiting seat, a gas cylinder, a pressure maintaining inner cavity and a sealing element. The mounting seat is installed on the top of the rack. A first hole is formed in the mounting seat. The limiting seat is installed on the mounting seat. A second hole is formed in the top of the limiting seat. The position of the second hole corresponds to the first hole. The output end of the gas cylinder is connected with the pressure maintaining inner cavity. The pressure maintaining inner cavity slides in the first hole. The top of the pressure maintaining inner cavity is open. The sealing element is installed at the top opening of the pressure maintaining inner cavity. The sealing element is used to cooperate with the zip-top cap. The gas outlet of the gas storage tank is connected with the gas cylinder and the pressure maintaining inner cavity in communication. The gas cylinder is used to drive the pressure maintaining inner cavity to move in vertical direction.

[0006] Different from the prior art, the technical scheme of the present application is provided with a pressure maintaining inner cavity. The zip-top cap is connected with the pressure maintaining inner cavity through the sealing element, and the pressure maintaining inner cavity acts as a zip-top can body. Therefore, the pressure maintaining inner cavity can be supplied with gas by the gas storage tank to simulate the pressure of the content in the zip-top can after filling. The opening detection of the zip-top cap under this condition is carried out to ensure the accuracy of detection, so that unqualified opening in subsequent use can be avoided, and actual use is affected.

[0007] As an embodiment of the utility model, the detection assembly further comprises a gas pressure gauge. The gas pressure gauge is installed on the mounting seat and is connected with the gas outlet of the gas storage tank in communication.

[0008] In this way, the gas pressure inside the pressure maintaining inner cavity can be observed by the gas pressure gauge, which is convenient for detection.

[0009] As an embodiment of the utility model, the detection assembly further comprises a guide copper sleeve and a guide key, the guide copper sleeve is installed in the first hole, a guide hole extending in the vertical direction is formed in the guide copper sleeve, and the guide key is installed outside the pressure maintaining cavity and is in sliding connection with the guide hole.

[0010] In this way, the guide key and the guide copper sleeve are arranged to guide the movement of the pressure maintaining cavity along the vertical direction through the first hole.

[0011] As an embodiment of the utility model, the detection mechanism further comprises a control electric box and a control assembly, the control electric box is in communication connection with the control assembly, the control assembly is installed on the rack, and the control assembly is connected with the detection mechanism.

[0012] In this way, the control assembly is arranged to control the operation of the detection mechanism, and specifically, the starting and stopping of the cylinder and the air intake of the pressure maintaining cavity are ensured.

[0013] As an embodiment of the utility model, the control assembly comprises a handle type air exchange switch and a plug-in type air exchange switch, the handle type air exchange switch is used for controlling the air intake and air exhaust of the cylinder, and the plug-in type air exchange switch is used for controlling the air intake of the pressure maintaining cavity.

[0014] In this way, different switches are arranged to control the separate operation of the cylinder and the pressure maintaining cavity. In actual use, the pull-tab cap is first placed in the sealing element and connected with the pressure maintaining cavity, then the handle type air exchange switch is used to control the air intake of the cylinder, the cylinder drives the pressure maintaining cavity to move upward along the vertical direction to the top of the pull-tab cap and the limiting seat, so that the pull-tab cap and the pressure maintaining cavity form a sealed space. Then, the plug-in type air exchange switch is used to control the air intake of the pressure maintaining cavity to simulate the pressure after the pull-tab can is filled with contents. Finally, the pull-tab cap is opened and detected through the second hole by the opening work of the worker.

[0015] As an embodiment of the utility model, the detection mechanism further comprises a pressure regulating valve and a check valve, the plug-in type air exchange switch is in communication connection with the gas storage tank, and the plug-in type air exchange switch is in communication connection with the pressure maintaining cavity through the pressure regulating valve and the check valve in sequence.

[0016] In this way, the pressure regulating valve is arranged to adjust the pressure of the pressure maintaining cavity to simulate different air pressure requirements. The check valve is arranged to ensure that the gas flows into the pressure maintaining cavity in one direction and does not flow back to the gas storage tank.

[0017] As an embodiment of the utility model, two detection mechanisms are arranged, two control assemblies are arranged, one detection mechanism corresponds to one control assembly, and the two detection mechanisms are used for detecting pull-tab caps of different sizes.

[0018] Therefore, two detection mechanisms are arranged to detect pull-tab covers of different sizes.

[0019] As an embodiment of the present application, the detection mechanism further comprises a first joint air block and two second joint air blocks, the gas outlet of the gas storage tank is connected with the first joint air block, the first joint air block is connected with the two control assemblies, and one control assembly corresponds to one second joint air block.

[0020] Therefore, the joint air blocks are arranged to connect the air paths of different components in the system. The first joint air block connects the two detection mechanisms, and the second joint air blocks connect the plurality of pressure maintaining cavities.

[0021] As an embodiment of the present application, the limiting seat comprises a limiting plate and two or more supporting blocks, and the limiting plate is installed on the mounting seat through the two or more supporting blocks.

[0022] Therefore, the supporting blocks are arranged to play a supporting role.

[0023] The above-mentioned content related to the description is only a summary of the technical scheme of the present application. In order to enable those skilled in the art to more clearly understand the technical scheme of the present application, and then can be implemented according to the content of the description and the drawings, and in order to enable the above-mentioned purpose and other purposes, characteristics and advantages of the present application to be more easily understood, the following will be described in combination with the specific embodiments of the present application and the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0024] The drawings are only used to show the principles, implementation manners, applications, characteristics and effects of the specific embodiments of the present application and other related contents, and cannot be considered as a limitation of the present application.

[0025] In the drawings of the specification:

[0026] Figure 1 The structure schematic view of the pressure maintaining cover opening detection instrument of one embodiment of the present application;

[0027] Figure 2 The structure schematic view of the detection assembly of one embodiment of the present application Figure 1 ;

[0028] Figure 3 The structure schematic view of the detection assembly of one embodiment of the present application Figure 2 ;

[0029] Figure 4 The structure schematic view of the detection assembly of one embodiment of the present application Figure 3 ;

[0030] Figure 5 The gas path diagram of the pressure maintaining cover opening detection instrument of one embodiment of the present application;

[0031] Figure 6 Circuit diagram of the pressure-maintaining uncovering detector of one embodiment of the present application.

[0032] The reference signs involved in the above-mentioned drawings are explained as follows:

[0033] 100-pressure-maintaining uncovering detector; 200-pull-ring cap; 1-frame; 11-supporting rod; 12-cabinet; 121-first cabinet; 122-second cabinet; 2-detecting mechanism; 21-detecting assembly; 211-mounting seat; 212-limiting seat; 2121-second hole; 2122-limiting plate; 2123-supporting block; 213-cylinder; 214-pressure-maintaining inner cavity; 215-sealing member; 216-air pressure gauge; 217-guiding copper sleeve; 218-guiding key; 22-gas storage tank; 23-control electric box; 24-control assembly; 241-handle type air exchange switch; 242-plug-in type air exchange switch; 25-pressure regulating valve; 26-one-way valve; 27-first gas connecting block; 28-second gas connecting block; Y-vertical direction. DETAILED DESCRIPTION

[0034] To make the possible application scenarios, technical principles, specific schemes that can be implemented, purposes and effects that can be achieved of the present application clear, the following will be described in detail in combination with the specific embodiments listed and the accompanying drawings. The embodiments described in the present document are only used to more clearly illustrate the technical schemes of the present application, and therefore only serve as examples, but cannot limit the protection scope of the present application.

[0035] In the present document, the term "embodiment" means that the specific features, structures or characteristics described in combination with the embodiment can be contained in at least one embodiment of the present application. The term "embodiment" appearing at various positions in the specification does not necessarily refer to the same embodiment, and does not particularly limit the independence or association between other embodiments. In principle, in the present application, as long as there is no technical contradiction or conflict, the technical features mentioned in each embodiment can be combined in any way to form a corresponding implementable technical scheme.

[0036] Unless otherwise defined, the meanings of the technical terms used in the present document are the same as those commonly understood by the person skilled in the art to which the present application belongs; the use of related terms in the present document is only for the purpose of describing specific embodiments, and is not intended to limit the present application.

[0037] In the description of the present application, the word "and / or" is a description of the logical relationship between the objects, which means that there can be three relationships, for example, A and / or B, which means that there are three cases: A exists, B exists, and A and B exist at the same time. In addition, the character " / " in the present document generally represents that the associated objects before and after are a "or" logical relationship.

[0038] In the present application, the terms such as "first" and "second" are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual number, primary or secondary, or order relationship between the entities or operations.

[0039] In the present application, the "includes", "contains", "has", or other similar expressions used in the statements are intended to cover non-exclusive inclusion, and do not exclude the presence of additional elements in the process, method or product comprising the elements, so that the process, method or product comprising a series of elements can not only include those defined elements, but also include other elements not explicitly listed, or also include elements inherent to such process, method or product.

[0040] As the same understanding as in the "Guidelines for Examination", in the present application, the expressions such as "greater than", "less than", "exceed" are understood as not including the number; the expressions such as "above", "below", "within" are understood as including the number. In addition, in the description of the embodiments of the present application, the meaning of "multiple" is more than two (including two), and similar expressions related to "multiple" are also understood in this way, for example, "multiple groups", "multiple times", etc., unless otherwise explicitly specified.

[0041] In the description of the embodiments of the present application, the spatial-related expressions used, such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "perpendicular", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. The indicated orientation or position relationship is based on the orientation or position relationship shown in the specific embodiment or the drawing, and is only for the convenience of describing the specific embodiments of the present application or for the reader to understand, and does not indicate or imply that the indicated device or component must have a specific position, a specific orientation, or be constructed or operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0042] Unless otherwise explicitly specified or limited, in the description of the embodiments of the present application, the terms "mount", "connect", "connect", "fix", "set", etc. should be understood in a broad sense. For example, the "connection" can be a fixed connection, or a detachable connection, or an integral setting; it can be a mechanical connection, or an electrical connection, or a communication connection; it can be directly connected, or indirectly connected through an intermediate medium; it can be the communication or interaction relationship between two elements. For those skilled in the art to which the present application belongs, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0043] According to some embodiments of the present application, please refer to Figures 1 to 6 The present embodiment relates to a pressure maintaining and cap opening detection instrument 100, comprising a rack 1 and a detection mechanism 2, the detection mechanism 2 is installed on the rack 1, the detection mechanism 2 comprises a detection assembly 21 and a gas storage tank 22, the detection assembly 21 comprises a mounting seat 211, a limiting seat 212, a gas cylinder 213, a pressure maintaining inner cavity 214 and a sealing element 215, the mounting seat 211 is installed on the top of the rack 1, a first hole is formed on the mounting seat 211, the limiting seat 212 is installed on the mounting seat 211, a second hole 2121 is formed on the top of the limiting seat 212, the position of the second hole 2121 corresponds to the first hole, the output end of the gas cylinder 213 is connected with the pressure maintaining inner cavity 214, the pressure maintaining inner cavity 214 slides in the first hole, the top of the pressure maintaining inner cavity 214 is open, the sealing element 215 is installed at the top opening of the pressure maintaining inner cavity 214, the sealing element 215 is used to cooperate with the pop-up cap 200, the gas outlet of the gas storage tank 22 is connected with the gas cylinder 213 and the pressure maintaining inner cavity 214 respectively, the gas cylinder 213 is used to drive the pressure maintaining inner cavity 214 to move along the vertical direction Y.

[0044] The rack 1 comprises two or more support rods 11 and a cabinet 12 installed on the support rod 11, the gas storage tank 22 and the control electric box 23 are both installed on the support rod 11. The cabinet 12 is in the shape of a ladder, and the gas cylinder 213 is installed inside the cabinet 12. The cabinet 12 comprises a first cabinet 121 and a second cabinet 122, the first cabinet 121 is below the second cabinet 122, the first cabinet 121 is used to place the control assembly 24, and the top of the second cabinet 122 is used to install the mounting seat 211, and the mounting seat 211 can be installed on the top of the second cabinet 122 by bolts.

[0045] The gas outlet of the gas storage tank 22 can be connected with the gas cylinder 213 through a first gas pipe and connected with the pressure maintaining inner cavity 214 through a second gas pipe, and the pressure maintaining inner cavity 214 is hollow. The movable rod of the gas cylinder 213 is connected with the pressure maintaining inner cavity 214 through a movable joint. The sealing element 215 can be a sealing ring, and different sealing rings can be used to detect pop-up caps 200 of different sizes.

[0046] In actual use, first, the pop-up cap 200 is cooperated with the sealing element 215, and the pop-up cap 200 covers the top opening of the pressure maintaining inner cavity 214. Second, the gas cylinder 213 drives the pressure maintaining inner cavity 214 to move upward along the vertical direction Y until the pop-up cap 200 is pressed against the top of the limiting seat 212, so that the pop-up cap 200 and the pressure maintaining inner cavity 214 form a sealed space. Third, the pressure maintaining inner cavity 214 is filled with gas to simulate the pressure after the pop can is filled with contents. Finally, the staff uses the opening work to detect the opening of the pop-up cap 200 through the second hole 2121.

[0047] The technical scheme of the application is provided with a pressure maintaining inner cavity 214, the easy-open lid 200 is connected with the pressure maintaining inner cavity 214 through a sealing element 215, and the pressure maintaining inner cavity 214 acts as an easy-open can body. Therefore, the pressure maintaining inner cavity 214 can be supplied with gas through the gas storage tank 22 to simulate the pressure after the easy-open can is filled with contents, and the easy-open lid 200 under this condition is subjected to opening detection, so that the accuracy of detection is ensured, and the unqualified opening in subsequent use is avoided, and the actual use is affected.

[0048] According to some embodiments of the application, as shown in Figures 1 to 5 The detection assembly 21 further includes a gas pressure gauge 216, the gas pressure gauge 216 is installed on the mounting seat 211, and the gas pressure gauge 216 is connected in communication with the gas outlet of the gas storage tank 22.

[0049] The gas outlet of the gas storage tank 22 is further connected in communication with the gas pressure gauge 216 through the second gas pipe. In this way, the gas pressure inside the pressure maintaining inner cavity 214 can be observed through the gas pressure gauge 216, which is convenient for detection. When in use, the pressure maintaining inner cavity 214 can be inflated by observing the gas pressure gauge 216.

[0050] According to some embodiments of the application, as shown in Figure 3 and Figure 4 The detection assembly 21 further includes a guide copper bush 217 and a guide key 218, the guide copper bush 217 is installed in the first hole, the guide copper bush 217 is provided with a guide hole extending in the vertical direction Y, and the guide key 218 is installed outside the pressure maintaining inner cavity 214 and is in sliding connection with the guide hole.

[0051] In this way, the guide key 218 and the guide copper bush 217 are matched to play a guiding role, so that the pressure maintaining inner cavity 214 can move upward or downward along the vertical direction Y through the first hole.

[0052] According to some embodiments of the application, as shown in Figure 1 The detection mechanism 2 further includes a control electric box 23 and a control assembly 24, the control electric box 23 is in communication connection with the control assembly 24, the control assembly 24 is installed on the rack 1, and the control assembly 24 is connected with the detection mechanism 2.

[0053] In this way, the control assembly 24 can control the operation of the detection mechanism 2, specifically, the start and stop of the gas cylinder 213 and the gas inlet of the pressure maintaining inner cavity 214 are ensured.

[0054] According to some embodiments of the application, as shown in Figure 1 and Figure 5 The control assembly 24 includes a handle type gas exchange switch 241 and a plug-in type gas exchange switch 242, the handle type gas exchange switch 241 is used for the gas inlet and outlet amount of the gas cylinder 213, and the plug-in type gas exchange switch 242 is used for controlling the gas inlet amount of the pressure maintaining inner cavity 214.

[0055] Thus, the single operation of the cylinder 213 and the pressure maintaining cavity 214 can be controlled by setting different switches. The activation of the cylinder 213 is controlled by the handle-type air exchange switch 241 to ensure safety in use. Different inflation air pressures are controlled by the plug-type air exchange valve, which can be quickly switched to different required air pressures.

[0056] In actual use, the pull-tab cap 200 needs to be matched with the sealing member 215 first, the cylinder 213 is controlled to intake air by the handle-type air exchange switch 241, the cylinder 213 drives the pressure maintaining cavity 214 to move upward along the vertical direction Y to the top of the limiting seat 212 and stop against the pull-tab cap 200, so that the pull-tab cap 200 and the pressure maintaining cavity 214 form a sealed space. Then, the pressure maintaining cavity 214 is controlled to intake air by the plug-type air exchange switch 242 to simulate the pressure after the pull-tab can is filled with contents. Finally, the worker uses the opening work to detect the opening of the pull-tab cap 200 through the second hole 2121.

[0057] According to some embodiments of the present application, as shown in Figure 5 The detection mechanism 2 further includes a pressure regulating valve 25 and a one-way valve 26. The plug-type air exchange switch 242 is connected to the gas storage tank 22 in communication, and the plug-type air exchange switch 242 is connected to the pressure maintaining cavity 214 in communication through the pressure regulating valve 25 and the one-way valve 26 in sequence.

[0058] Thus, the pressure of the pressure maintaining cavity 214 can be adjusted by setting the pressure regulating valve 25 to simulate different air pressure requirements. The one-way valve 26 can be set to one or two to ensure that the gas flows into the pressure maintaining cavity 214 in one direction and does not flow back to the gas storage tank 22.

[0059] According to some embodiments of the present application, as shown in Figure 1 , Figure 2 and Figure 5 Two detection mechanisms 2 are provided, and two sets of control assemblies 24 are provided. One detection mechanism 2 corresponds to one set of control assemblies 24, and the two detection mechanisms 2 are used to detect pull-tab caps 200 of different sizes.

[0060] Thus, two detection mechanisms 2 can be used to detect pull-tab caps 200 of different sizes. Different sizes of pull-tab caps 200 are controlled by corresponding control assemblies 24. Optionally, each detection mechanism 2 includes two or more detection assemblies 21, as shown in Figure 2 and Figure 5 Each detection mechanism 2 includes four detection assemblies 21.

[0061] According to some embodiments of the present application, as shown in Figure 5As shown, the detection mechanism 2 further comprises a first joint air block 27 and two second joint air blocks 28, the gas outlet of the gas tank 22 is connected with the first joint air block 27, the first joint air block 27 is connected with two groups of control components 24, and one group of control components 24 corresponds to one second joint air block 28.

[0062] In this way, the joint air block is arranged to connect the gas paths of different components in the system. The first joint air block 27 connects two detection mechanisms 2, and the second joint air block 28 connects multiple pressure maintaining cavities 214. The second joint air block 28 corresponds to one group of control components 24, that is, one detection mechanism 2. The number of pressure maintaining cavities 214 is determined according to the number of detection components 21, such as Figure 5 As shown, the detection mechanism 2 comprises four groups of detection components 21, and therefore the second joint air block 28 connects four pressure maintaining cavities 214.

[0063] According to some embodiments of the present application, optionally, as shown, Figure 2 As shown, the limiting seat 212 comprises a limiting plate 2122 and two or more supporting blocks 2123, and the limiting plate 2122 is installed on the mounting seat 211 through the two or more supporting blocks 2123.

[0064] In this way, the supporting blocks 2123 play a supporting role.

[0065] Those skilled in the art can understand that although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments means to be within the scope of the present application and form different embodiments. For example, in the claims, any one of the claimed embodiments can be used in any combination.

[0066] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the description of the present application. Especially, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A pressure-maintaining lid opening detector, characterized in that: include: frame; The detection mechanism is installed on the frame, and the detection mechanism includes a detection component and an air tank. The detection component includes a mounting seat, a limit seat, a cylinder, a pressure-maintaining cavity and a seal. The mounting seat is installed on the top of the frame, and a first hole is opened on the mounting seat. The limit seat is installed on the mounting seat. A second hole is opened on the top of the limit seat. The position of the second hole corresponds to the first hole. The output end of the cylinder is connected to the pressure-maintaining cavity, and the pressure-maintaining cavity slides in the first hole. The top of the pressure-maintaining cavity is open, and the seal is installed at the top opening of the pressure-maintaining cavity. The seal is used to cooperate with the easy-open cover. The air outlet of the air tank is respectively connected to the cylinder and the pressure-maintaining cavity, and the cylinder is used to drive the pressure-maintaining cavity to move in the vertical direction.

2. The pressure-maintaining cover opening detector according to claim 1, characterized in that: The detection component also includes a pressure gauge, which is installed on the mounting base and is connected to the air outlet of the gas storage tank.

3. The pressure-maintaining cover opening detector according to claim 1, characterized in that: The detection component also includes a guide copper sleeve and a guide key. The guide copper sleeve is installed in the first hole. The guide copper sleeve is provided with a guide hole extending along the vertical direction. The guide key is installed outside the pressure-maintaining inner cavity. The guide key is slidably connected to the guide hole.

4. The pressure-maintaining cover opening detector according to claim 1, characterized in that: The detection mechanism further includes a control electrical box and a control component. The control electrical box is in communication connection with the control component. The control component is mounted on the rack, and the control component is connected to the detection mechanism.

5. The pressure-maintaining cover opening detector according to claim 4, characterized in that: The control component includes a handle-type ventilation switch and a plug-in ventilation switch. The handle-type ventilation switch is used to control the air inlet and outlet of the cylinder, and the plug-in ventilation switch is used to control the air intake of the pressure-maintaining inner cavity.

6. The pressure-maintaining cover opening detector according to claim 5, characterized in that: The detection mechanism also includes a pressure regulating valve and a one-way valve. The plug-in ventilation switch is connected to the gas storage tank. The plug-in ventilation switch is connected to the pressure maintaining inner cavity through the pressure regulating valve and the one-way valve in turn.

7. The pressure-maintaining cover opening detector according to claim 4, characterized in that: There are two detection mechanisms, and two groups of control components. One detection mechanism corresponds to one group of control components, and the two detection mechanisms are used to detect easy-open lids of different sizes.

8. The pressure-maintaining cover opening detector according to claim 7, characterized in that: The detection mechanism also includes a first gas connection block and two second gas connection blocks. The gas outlet of the gas storage tank is connected to the first gas connection block. The first gas connection block is connected to two groups of the control components, and one group of the control components corresponds to one second gas connection block.

9. The pressure-maintaining cover opening detector according to claim 1, characterized in that: The limiting seat includes a limiting plate and two or more supporting blocks, and the limiting plate is installed on the mounting seat through the two or more supporting blocks.

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