An automated ton bottle air tightness testing device and system

Abstract

The application discloses an automatic ton-bottle air tightness testing device, which comprises air tightness testing devices arranged in parallel, and the table surface of each air tightness testing device is arranged to be inclined; the air tightness testing device comprises a feeding mechanism, a feeding buffer mechanism, a testing mechanism, a discharging buffer mechanism and a discharging mechanism; the angle between the platform of the feeding buffer mechanism and the horizontal direction is larger than the angle between the platform of the discharging buffer mechanism and the horizontal direction; and the platforms of the feeding buffer mechanism and the discharging buffer mechanism are provided with buffer baffles to prevent the ton bottles from rolling down. In addition, the application further discloses a gas guiding system of the automatic ton-bottle air tightness testing device; the gas guiding system enables the compressed gas between the ton bottles on the two air tightness testing devices to be transmitted so as to achieve air pressure balance, save the compressed gas and save the cost.

Description

Technical Field

[0001] This invention relates to the field of airtightness testing technology, and in particular to an automated ton-bottle airtightness testing device and system. Background Technology

[0002] Gas cylinders, used for storing various liquids and gases, can be categorized by material (steel, aluminum, stainless steel, etc.) and by size (small, medium, large). Gas cylinders are characterized by high working pressure, light weight, cleanliness, safety, and reliability, and are widely used in daily life and industrial production. Because gas cylinders contain high-pressure gas or liquid, testing their airtightness is essential. Furthermore, the airtightness testing methods differ depending on the material and model of the cylinder, resulting in variations in the testing equipment. Additionally, larger cylinders require more compressed gas for airtightness testing, and simply evacuating the compressed gas afterward often leads to significant waste. Therefore, designing a specialized and suitable automated airtightness testing device for ton cylinders is highly necessary. Summary of the Invention

[0003] This invention discloses an automated ton-cylinder airtightness testing device, which includes a plurality of airtightness testing devices arranged in parallel, wherein each airtightness testing device is provided with:

[0004] A feeding mechanism, which includes a feeding platform, the feeding platform being driven by a feeding transmission mechanism via feeding wheels;

[0005] A feeding buffer mechanism, which includes a feeding buffer baffle;

[0006] The test apparatus includes a material frame for placing ton bottles, a pressing mechanism, and a water tank. The bottom of the material frame is provided with a material frame platform, the pressing mechanism is provided with a pressing platform, and the ton bottles are placed between the pressing platform and the material frame platform and immersed in the water tank.

[0007] A feeding buffer mechanism, which includes a feeding buffer baffle;

[0008] A feeding mechanism, which includes a feeding platform, the feeding platform being driven by a feeding transmission mechanism via feeding wheels;

[0009] The angle between the platform of the feeding buffer mechanism and the horizontal direction is γ, the angle between the platform of the material frame platform and the horizontal direction is β, and the angle between the platform of the unloading buffer mechanism and the horizontal direction is α, where α < β < γ.

[0010] In one embodiment, the included angles α, β, and γ range from 0 < γ < 5°, 0 < β < 3°, and 0 < α < 2°.

[0011] Further preferred values ​​are 0 < γ < 3°, 0 < β < 2°, and 0 < α < 1°.

[0012] In one embodiment, the plurality of airtightness testing devices includes a first airtightness testing device and a second airtightness testing device.

[0013] In one embodiment, the test mechanism further includes a drive mechanism for controlling the lifting and lowering of the material frame, a guide mechanism for controlling the lifting and lowering of the material frame, and a baffle mechanism for preventing the ton bottle from rolling.

[0014] In one embodiment, the drive mechanism drives the material frame to rise and fall via a chain.

[0015] In one embodiment, the feeding buffer baffle and / or the unloading buffer baffle is one of a fan-shaped, square protrusion, arc protrusion, or stepped protrusion, and the side shape of the lower pressure table is one of a straight line, ridge, arc, or wave shape.

[0016] The airtightness test procedure is as follows:

[0017] The S1 feeding mechanism lifts the ton bottle for feeding;

[0018] The S2 ton bottle enters the feeding buffer mechanism, and the feeding buffer baffle is raised;

[0019] S3 lowers the feeding buffer baffle, and the ton bottle enters the test mechanism. The material frame and the pressing mechanism lower simultaneously, and the baffle mechanism raises to immerse the ton bottle in the water tank. The pressing mechanism presses the ton bottle tightly and fills it with compressed gas. The air tightness of the ton bottle is judged by manual or intelligent recognition technology.

[0020] The S4 lowering baffle mechanism raises the feeding buffer baffle, allowing the ton cylinders that have completed the airtightness test to enter the feeding buffer mechanism to wait for feeding.

[0021] The S5 lowers the feeding buffer baffle, and the ton bottle naturally rolls onto the feeding mechanism to complete the feeding.

[0022] The present invention also provides a system for an automated ton bottle air tightness testing device, which includes a plurality of automated ton bottle air tightness testing devices arranged in parallel, wherein a single ton bottle is placed on a single automated ton bottle air tightness testing device, and the single ton bottle is connected to a single air inlet pipe;

[0023] The plurality of intake pipes are connected to a single sub-intake pipe, or the plurality of intake pipes are respectively connected to the plurality of sub-intake pipes;

[0024] The plurality of sub-intake pipes are connected to a single main intake pipe; each sub-intake pipe is provided with a sub-intake valve, which is located between the first junction point of the intake pipe and the sub-intake pipe and the second junction point of the sub-intake pipe and the main intake pipe;

[0025] A single intake pipe is connected to a single exhaust pipe, and the single exhaust pipe is provided with one or more exhaust valves that control the corresponding intake pipe;

[0026] The intake pipe is equipped with an intake valve, which is located between the exhaust junction of the exhaust pipe and the sub-intake pipe and the intake junction of the intake pipe and the sub-intake pipe.

[0027] In one embodiment, it includes the first and second ton bottles arranged in parallel;

[0028] The first ton cylinder is connected to the first inlet pipe, which is equipped with a first digital pressure transmitter and a first pressure gauge. The second ton cylinder is connected to the second inlet pipe, which is equipped with a second digital pressure transmitter and a second pressure gauge.

[0029] The distance between the first digital pressure transmitter and the first ton bottle is less than the distance between the first pressure gauge and the first ton bottle; the distance between the second digital pressure transmitter and the second ton bottle is less than the distance between the second pressure gauge and the second ton bottle.

[0030] In one embodiment, the exhaust pipe is provided with a first exhaust valve for controlling the exhaust of the first ton bottle and a second exhaust valve for controlling the exhaust of the second ton bottle.

[0031] In one embodiment, the first pressure gauge includes a first working pressure gauge and a first calibration pressure gauge, wherein the accuracy of the first calibration pressure gauge is higher than that of the first working pressure gauge; the second pressure gauge includes a second working pressure gauge and a second calibration pressure gauge, wherein the accuracy of the second calibration pressure gauge is higher than that of the second working pressure gauge.

[0032] When gas is transferred from the first ton cylinder to the second ton cylinder, the first digital pressure transmitter displays the gas pressure inside the first ton cylinder; the second digital pressure transmitter displays the gas pressure inside the second ton cylinder.

[0033] In one embodiment, the difference between the value of the first digital pressure transmitter and the value of the second digital pressure transmitter ranges from -1.5 MPa to 1.5 MPa.

[0034] The overall gas guiding process is as follows:

[0035] First, open the inlet valve and the first inlet valve to conduct an airtightness test on the first ton cylinder. The first inlet valve needs to be closed when conducting the airtightness test on the first ton cylinder.

[0036] Second, after completing the airtightness test of the first ton of cylinders, close the sub-inlet valve and open the first and second inlet valves to guide air from the first ton of cylinders to the second ton of cylinders.

[0037] Third, pressure balance: the difference between the values ​​of the first digital pressure transmitter and the second digital pressure transmitter is between -1.5 MPa and 1.5 MPa.

[0038] Fourth, close the first inlet valve, open the first exhaust valve to discharge the remaining compressed gas in the first ton cylinder, and at the same time open the sub-inlet valve to fill the second ton cylinder with gas;

[0039] Fifth, when conducting the airtightness test on the second ton cylinder, close the second air inlet valve. After the airtightness test is completed, close the sub-air inlet valve and open the first and second air inlet valves to complete the air introduction of the second ton cylinder. Repeat steps three and four.

[0040] Sixth, repeat steps one through five.

[0041] Technical effects:

[0042] 1. A gas guiding system is provided between the two airtightness test devices set in parallel, so that the compressed gas in the ton bottle can be conducted, the compressed gas can be recycled, and resources can be saved.

[0043] 2. The platform of the airtightness test device is inclined, and the angle between the feeding buffer mechanism platform and the horizontal direction is greater than the angle between the discharging buffer mechanism platform and the horizontal direction, which facilitates the automatic entry of the ton bottle into the test mechanism and the discharging mechanism.

[0044] 3. A material frame is provided at the test mechanism, the ton bottle is located in the material frame, and a pressing mechanism is set above the ton bottle. The ton bottle is located between the material frame and the pressing mechanism, forming a "sandwich" structure, so that the ton bottle can be rapidly heated in the water tank for airtightness testing. Attached Figure Description

[0045] Figure 1 This is a perspective view of an automated ton-bottle airtightness testing device according to the present invention;

[0046] Figure 2 This is a side view of an automated ton-bottle air tightness testing device according to the present invention;

[0047] Figure 3 This is a side view of the feeding mechanism and feeding buffer mechanism of an automated ton bottle air tightness testing device according to the present invention;

[0048] Figure 4 This is a side view of the test mechanism of an automated ton bottle airtightness testing device according to the present invention;

[0049] Figure 5 This is a side view of the feeding mechanism and feeding buffer mechanism of an automated ton bottle airtightness testing device according to the present invention;

[0050] Figure 6This is a schematic diagram showing the tilt angle of the platform of the automated ton bottle air tightness testing device of the present invention;

[0051] Figure 7 This is a schematic diagram of the air guiding system of an automated ton-bottle air tightness testing device according to the present invention. Detailed Implementation

[0052] This invention discloses an automated ton-bottle airtightness testing device, comprising two airtightness testing devices connected in parallel. The platform of each airtightness testing device is inclined. Each airtightness testing device includes a feeding mechanism, a feeding buffer mechanism, a testing mechanism, a discharging buffer mechanism, and a discharging mechanism. The angle between the platform of the feeding buffer mechanism and the horizontal direction is greater than the angle between the platform of the discharging buffer mechanism and the horizontal direction. Buffer baffles are provided on the platforms of both the feeding and discharging buffer mechanisms to prevent the ton-bottles from rolling off. Furthermore, a gas guiding system connects the two airtightness testing devices, allowing compressed gas to be transferred between the ton-bottles on both devices, thereby achieving pressure balance, saving compressed gas, and reducing costs.

[0053] Please see Figure 1 This application discloses an airtightness testing device, which includes a first airtightness testing device 100A and a second airtightness testing device 100B, which form a parallel structure, and the air inlet valves on both are controlled by an air control console 200.

[0054] Please see further. Figure 2-5 Taking the first airtightness test device 100A as an example, it includes a feeding mechanism 1, a feeding buffer mechanism 2, a test mechanism 3, a discharging buffer mechanism 4, and a discharging mechanism 5. The ton bottle 6 passes through the feeding mechanism 1, feeding buffer mechanism 2, test mechanism 3, discharging buffer mechanism 4, and discharging mechanism 5 in sequence to complete the airtightness test. The feeding mechanism 1 includes a feeding platform 11, which is driven by a feeding transmission mechanism 13 via a feeding wheel 12 for feeding. To prevent the ton bottle 6 from rolling off, a first protrusion 111 is provided on the side of the feeding platform 11 away from the feeding wheel 12. The feeding transmission mechanism 13 includes a feeding transmission wheel 131 and a feeding wire 132. One end of the feeding wire 132 is wound around the feeding transmission wheel 131, and the other end is wound around the feeding wheel 12. The rotation of the feeding transmission wheel 131 drives the feeding wheel 12 to move, thereby driving the feeding platform 11 to reciprocate up and down to complete the feeding. The feeding buffer mechanism 2 includes a first cylinder 21 and a feeding buffer baffle 22. The feeding buffer baffle 22 is fan-shaped, but it can also be configured with square protrusions, arc-shaped protrusions, or stepped protrusions. The first cylinder 21 drives the feeding buffer baffle 22 to rise and fall smoothly to block and release the ton bottle 6, preventing congestion caused by feeding new material before the testing mechanism 3 has completed its test. The feeding buffer mechanism 2 can avoid such situations.

[0055] The test mechanism 3 includes a material frame 31 for placing the ton bottle 6, a drive mechanism 32 for controlling the lifting and lowering of the material frame 31, a guide mechanism 33 to prevent the material frame 31 from deviating, a baffle mechanism 34 to prevent the ton bottle 6 from rolling, a pressing mechanism 35, and a water tank 36. The bottom of the material frame 31 is provided with a material frame platform 311, and the bottom of the pressing mechanism 35 is provided with a pressing platform 351. The ton bottle 6 is placed between the material frame platform 311 and the pressing platform 351, forming a "sandwich" structure. The side of the pressing platform 351 can be one of a straight line, a ridge, an arc, or a wave shape, preferably a ridge shape, to better fit the ton bottle 6. The drive mechanism 32 drives the material frame 31 to lift and lower via a chain 321. To prevent the material frame 31 from deviating during the lifting and lowering process, a guide mechanism 33 is provided around the material frame 31, preferably a guide wheel.

[0056] The feeding buffer mechanism 4 includes a second cylinder 41 and a feeding buffer baffle 42. The feeding buffer baffle 42 is raised and lowered by the second cylinder 41. The feeding buffer baffle 42 is fan-shaped. The feeding buffer baffle 42 can also be one of the following: square protrusion, arc protrusion, or stepped protrusion.

[0057] The feeding mechanism 5 includes a feeding platform 51, a feeding wheel 52, and a feeding transmission mechanism 53. The feeding platform 51 is driven by the feeding wheel 52 and the feeding transmission mechanism 53 to move up and down to complete the feeding action. The feeding platform 51 has a second protrusion 511 at the end away from the feeding wheel 52 to prevent the ton bottle 6 from rolling off the feeding platform 51.

[0058] Further explanation is needed; please refer to [link / reference]. Figure 6 The platform of the first airtightness testing device 100A is inclined. The angle between the platform of the feeding buffer mechanism 2 and the horizontal direction is γ, where 0 < γ < 5°. The angle between the platform of the material frame platform 311 and the horizontal direction is β, where 0 < β < 3°. The angle between the platform of the unloading buffer mechanism 4 and the horizontal direction is α, where 0 < α < 2°, where α < β < γ. The platform of the feeding mechanism 1 extending to the unloading mechanism 5 is inclined, so that the ton bottle 6 can automatically move from the feeding mechanism 1 to the unloading mechanism 5 without the need for external force.

[0059] The airtightness test procedure is as follows:

[0060] S1 feeding mechanism 1 lifts the ton bottle 6 for feeding;

[0061] S2 ton bottle 6 enters the feeding buffer mechanism 2, and the feeding buffer baffle 22 is raised;

[0062] S3 lowers the feeding buffer baffle 22, the ton bottle 6 enters the test mechanism 3, the baffle lifting mechanism 34, the material frame 31 and the pressing mechanism 35 descend simultaneously, immersing the ton bottle 6 into the water tank 36, the pressing mechanism presses the ton bottle 6 tightly, and the ton bottle 6 is filled with compressed gas. The air tightness of the ton bottle 6 is judged by manual or intelligent identification technology.

[0063] S4 lowering baffle mechanism 34 raises the material feeding buffer baffle 42, and the ton bottle 6 that has completed the airtightness test enters the material feeding buffer mechanism 4 to wait for material feeding;

[0064] S5 lowers the feeding buffer baffle 42, and the ton bottle naturally rolls onto the feeding mechanism 5 to complete the feeding.

[0065] Please see Figure 1 and Figure 7 This application discloses a gas guiding system 7, in which two ton cylinders 6 are connected in parallel between a first airtightness test device 100A and a second airtightness test device 100B. When conducting an airtightness test on the first ton cylinder 6A in the first airtightness test device 100A, the main air inlet pipe 71 is inflated. A pressure gauge 711 installed on the main air inlet pipe displays the pressure of the compressed gas in the main air inlet pipe 71, facilitating control of the internal pressure of the first ton cylinder 6A. The main air inlet pipe 71 can be divided into multiple branch air inlet pipes 72, including a first air inlet pipe 721 and a second air inlet pipe 722. Opening the branch air inlet valve 712 on the branch air inlet pipe 72 and the first air inlet valve 7211 on the first air inlet pipe 721 allows compressed gas to enter the first ton cylinder 6A for airtightness testing. At this time, the first air inlet valve 7211 needs to be closed. The branch air inlet valve 712 is located between the branch air inlet pipe 72 and the main air inlet pipe 71. The second junction point is between the first junction point of the first intake pipe 721 and the first junction point of the sub-intake pipe 72. The first intake valve 7211 is located between the first exhaust junction point of the first intake pipe 721 and the exhaust pipe 73 and the first intake junction point of the sub-intake pipe 72 and the first intake pipe 721. Similarly, the second intake valve 7221 is located between the second exhaust junction point of the second intake pipe 722 and the exhaust pipe 73 and the second intake junction point of the sub-intake pipe 72 and the second intake pipe 722.

[0066] To avoid wasting compressed gas in the first ton cylinder 6A, this invention discloses a gas guiding system 7 to transfer the compressed gas in the first ton cylinder 6A to the second ton cylinder 6B. The inlet valve 712 is closed, and the first inlet valve 7211 on the first inlet pipe 721 and the second inlet valve 7221 on the second inlet pipe 722 are opened, allowing the compressed gas in the first ton cylinder 6A to be transferred to the second ton cylinder 6B. Based on the distance from the first inlet valve 7211, the first inlet pipe 721 is sequentially equipped with a first working pressure gauge 7212, a first calibration pressure gauge 7213 for calibration, and a first digital pressure transmitter 7214 for real-time display of pressure changes within the first ton cylinder 6A, wherein the accuracy of the first working pressure gauge 7212 is lower than that of the first calibration pressure gauge 7213. Similarly, based on their distance from the second inlet valve 7221, a second working pressure gauge 7222, a second calibration pressure gauge 7223, and a second digital pressure transmitter 7224 displaying the pressure change inside the second ton cylinder 6B are sequentially installed on the second inlet pipe 722. When the pressure in the first ton cylinder 6A and the second ton cylinder 6B reaches equilibrium, that is, when the difference between the values ​​of the first digital pressure transmitter 7214 and the second digital pressure transmitter 7224 is between -1.5MPa and 1.5MPa, more preferably -1MPa to 1MPa, and even more preferably -0.5MPa to 0.5MPa, the compressed gas in the first ton cylinder 6A needs to be vented out through the exhaust pipe 73. One end of the exhaust pipe 73 is connected to the first ton cylinder 6A, and the other end is connected to the silencer 733. Close the first intake valve 7221 and open the first exhaust valve 731 to discharge the remaining compressed gas in the first ton cylinder 6A to the muffler 733. Simultaneously, charge the second ton cylinder 6B for an airtightness test, then close the second intake valve 7221. The simultaneous venting of the first ton cylinder 6A and charging of the second ton cylinder 6B saves time and eliminates the need to start charging from scratch, thus saving costs. Open the first intake valve 7211 and the second intake valve 7221. After the airtightness test is completed, the second ton cylinder 6B again completes the compressed gas transfer with the new first ton cylinder 6A-1 to reach a new equilibrium. Close the second intake valve 7221 and open the second exhaust valve 732 to discharge the remaining compressed gas in the ton cylinder 6B through the exhaust pipe 73 to the muffler 733. This recycling process conserves compressed gas and reduces costs.

[0067] In other embodiments, the main air intake pipe 71 can be divided into two sub-air intake pipes 72, that is, one main air intake pipe can simultaneously lead to two sub-air intake pipes 72, and each sub-air intake pipe 72 is then connected to the first air intake pipe 721 and the second air intake pipe 722. The two air guiding systems 7 operate simultaneously, which greatly saves the airtightness test time.

[0068] In other embodiments, the main air intake pipe 71 can be divided into a plurality of sub-air intake pipes 72, that is, one main air intake pipe can simultaneously lead to a plurality of sub-air intake pipes 72, and each sub-air intake pipe 72 is then connected to a first air intake pipe 721 and a second air intake pipe 722, and a plurality of air guiding systems 7 operate simultaneously.

[0069] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that various modifications and improvements can be made without departing from the concept of the present invention, and these all fall within the protection scope of the present invention.

Claims

1. An automated ton-cylinder air tightness testing device, characterized in that: It includes a plurality of airtightness testing devices arranged in parallel, wherein each airtightness testing device is provided with: A feeding mechanism, which includes a feeding platform, the feeding platform being driven by a feeding transmission mechanism via feeding wheels; A feeding buffer mechanism, which includes a feeding buffer baffle; The test apparatus includes a material frame for placing ton bottles, a pressing mechanism, and a water tank. The bottom of the material frame is provided with a material frame platform, the pressing mechanism is provided with a pressing platform, and the ton bottles are placed between the pressing platform and the material frame platform and immersed in the water tank. A feeding buffer mechanism, which includes a feeding buffer baffle; A feeding mechanism, which includes a feeding platform, the feeding platform being driven by a feeding transmission mechanism via feeding wheels; The angle between the platform of the feeding buffer mechanism and the horizontal direction is γ, the angle between the platform of the material frame platform and the horizontal direction is β, and the angle between the platform of the unloading buffer mechanism and the horizontal direction is α, where α < β < γ.

2. The automated ton-cylinder air tightness testing device according to claim 1, characterized in that: The included angles α, β, and γ are in the range of 0 < γ < 5°, 0 < β < 3°, and 0 < α < 2°.

3. The automated ton-cylinder air tightness testing device according to claim 1, characterized in that: The plurality of airtightness testing devices includes a first airtightness testing device and a second airtightness testing device.

4. The automated ton-cylinder airtightness testing device according to claim 1, characterized in that: The test mechanism also includes a drive mechanism for controlling the lifting and lowering of the material frame, a guide mechanism for controlling the lifting and lowering of the material frame, and a baffle mechanism for preventing the ton bottle from rolling.

5. The automated ton-cylinder airtightness testing device according to claim 4, characterized in that: The drive mechanism raises and lowers the material frame via a chain.

6. The automated ton-cylinder airtightness testing device according to claim 1, characterized in that: The feeding buffer baffle and / or the unloading buffer baffle are one of the following: fan-shaped, square protrusion, arc protrusion, and stepped protrusion; the side shape of the lower pressure table is one of the following: straight, ridge-shaped, arc-shaped, and wave-shaped.

7. A system for the automated ton-cylinder airtightness testing device as described in claim 1, characterized in that: It includes a plurality of automated ton-cylinder air tightness testing devices arranged in parallel, with a single ton-cylinder placed on each of the automated ton-cylinder air tightness testing devices, and the single ton-cylinder connected to a single air inlet pipe; The plurality of intake pipes are connected to a single sub-intake pipe, or the plurality of intake pipes are respectively connected to the plurality of sub-intake pipes; The plurality of sub-intake pipes are connected to a single main intake pipe; each sub-intake pipe is provided with a sub-intake valve, which is located between the first junction point of the intake pipe and the sub-intake pipe and the second junction point of the sub-intake pipe and the main intake pipe; A single intake pipe is connected to a single exhaust pipe, and the single exhaust pipe is provided with one or more exhaust valves that control the corresponding intake pipe; The intake pipe is equipped with an intake valve, which is located between the exhaust junction of the exhaust pipe and the sub-intake pipe and the intake junction of the intake pipe and the sub-intake pipe.

8. The automated ton-cylinder air tightness testing system according to claim 7, characterized in that: It includes the first and second ton bottles arranged in parallel; The first ton cylinder is connected to the first inlet pipe, which is equipped with a first digital pressure transmitter and a first pressure gauge. The second ton cylinder is connected to the second inlet pipe, which is equipped with a second digital pressure transmitter and a second pressure gauge. The distance between the first digital pressure transmitter and the first ton bottle is less than the distance between the first pressure gauge and the first ton bottle; the distance between the second digital pressure transmitter and the second ton bottle is less than the distance between the second pressure gauge and the second ton bottle.

9. The automated ton-cylinder air tightness testing system according to claim 8, characterized in that: The exhaust pipe is equipped with a first exhaust valve for controlling the exhaust of the first ton bottle and a second exhaust valve for controlling the exhaust of the second ton bottle.

10. The automated ton-cylinder airtightness testing system according to claim 8, characterized in that: The first pressure gauge includes a first working pressure gauge and a first calibration pressure gauge, wherein the accuracy of the first calibration pressure gauge is higher than that of the first working pressure gauge; the second pressure gauge includes a second working pressure gauge and a second calibration pressure gauge, wherein the accuracy of the second calibration pressure gauge is higher than that of the second working pressure gauge.

11. The automated ton-cylinder air tightness testing system according to claim 8, characterized in that: The difference between the values ​​of the first digital pressure transmitter and the second digital pressure transmitter ranges from -1.5 MPa to 1.5 MPa.

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