Empty can leak detector

Abstract

The utility model belongs to the technical field of container sealing performance detection, and particularly relates to an empty can leak detector which comprises a mechanical device, an electrical control device, a monitoring device and a gas circuit. The mechanical device comprises a sealing plate, a sealing plate support, a screw rod, a sliding block, a sliding way supporting assembly and a powerful magnetic block. The electrical control device comprises a stepping motor and a stepping motor driving controller; the high-definition monitoring device comprises a high-definition monitoring camera which is used for monitoring the tank body to be detected; the gas circuit comprises a gas pipe pup joint, a gas pipe, a control valve, a vacuum generator, a pressure gauge, a gas suction electromagnetic valve, a release valve and a gas circuit driving controller. During leak detection, water is injected into an empty tank to be detected, the tank to be detected is pressurized through atmospheric pressure, the tank to be detected is sealed, the negative pressure device is used for extracting residual air in the tank to form negative pressure, whether bubbles are generated in water in the tank or not is detected to judge whether a product leaks or not, the problem that small differential pressure of a traditional leak detector is difficult to distinguish is solved, and the detection precision is improved. And automatic test of empty can leak detection is realized.

Description

Technical Field

[0001] The utility model relates to an empty can leak detector, belonging to the technical field of container sealing performance detection. Background Art

[0002] In industrial production, many products, such as canned foods, beverages, and pharmaceutical preparations, require leak-tightness testing to ensure they are leak-free during storage and transportation. This demand for leak-tightness testing has driven the development of leak detection technology. Early leak detection methods simply used pressure gauges or pressure sensors to measure pressure changes within the workpiece and infer the amount of leakage. However, this approach often falls short in complex testing environments, where high accuracy is required, or when the test pressure is high and the leak is minute. Existing differential pressure leak detection methods are limited in their application by several factors: For example, the resolution of the measuring instrument is limited. When using air as the test medium, high resolution is required, but existing instruments often lack this requirement, especially when measuring small leaks at low pressures. The accuracy of differential pressure leak detection is significantly affected by container size; larger containers increase the probability of leak detection failure based on pressure change methods. Temperature sensitivity is also a limitation: the gas pressure in a sealed container is significantly affected by temperature; even small temperature changes can result in large pressure changes, affecting measurement accuracy. Furthermore, the detection process is relatively complex, and in some cases, it is impossible to accurately locate the leak. Existing leak detection methods also suffer from the problem that differential pressure leak detectors are insensitive to the diffusion leak rates of liquids and gases, resulting in poor detection results. Their detection principle is based on pressure changes, and the pressure changes caused by small leak rates can be very small, making them difficult to accurately measure. The results of differential pressure leak detectors are affected by various factors, such as temperature, container size, and test time, leading to increased uncertainty in the test results. Therefore, more advanced and accurate leak detectors, such as an empty can leak detector, are needed to address these technical issues. Utility Model Content

[0003] The utility model is designed to solve the problem that traditional leak detectors are difficult to distinguish with small pressure differences. A new leak detection method is adopted, in which water is injected into an empty can, the empty can is sealed and the remaining air in the empty can is extracted to form a negative pressure, so as to detect whether the seal of the empty can is intact.

[0004] The technical solution of this utility model:

[0005] An empty tank leak detector comprises a mechanical device, an electrical control device, a monitoring device and an air circuit;

[0006] The mechanical device includes: a sealing plate, a sealing plate bracket, a screw, a slider, a slideway support assembly, and a strong magnetic block;

[0007] The electrical control device includes: a stepper motor, a stepper motor drive controller, and the stepper motor drive controller is electrically connected to the stepper motor and is used to drive the stepper motor;

[0008] The high-definition monitoring device includes: a high-definition monitoring camera for monitoring the tank under test;

[0009] The gas circuit includes: a gas pipe short circuit, a gas pipe, a control valve, a vacuum generator, a pressure gauge, a suction solenoid valve, a discharge valve, and a gas circuit drive controller;

[0010] A stepper motor is provided on the top of the slide support assembly, a screw is provided inside the slide support assembly, the top of the screw is connected to the output end of the stepper motor, a slider is slidably installed on the slide of the slide support assembly, and the slider is threadedly matched with the screw, a sealing plate bracket is installed on the outside of the slider, and the lower end of the sealing plate bracket is connected to the sealing plate through an air pipe short circuit, the sealing plate is located directly above the tank body to be tested, and the tank body to be tested is placed on a strong magnetic block;

[0011] The air pipe short circuit is connected to the air suction solenoid valve and the lower interface of the discharge valve through the air pipe, the upper interface of the air suction solenoid valve is connected to the outlet end of the vacuum generator, the air inlet end of the vacuum generator is connected to one end of the pressure gauge, the other end of the pressure gauge is connected to the control valve, and the air circuit drive controller is connected to the air suction solenoid valve and the discharge valve.

[0012] Furthermore, the slide support assembly includes a slide, a guide column, and a slide fixing frame; a slide is provided on the rear side plate of the slide fixing frame, the bottom end of the guide column is fixed on the bottom plate of the slide fixing frame, the top end of the guide column is fixed on the top plate of the slide fixing frame, and the slider slides with the guide column.

[0013] Furthermore, the mechanical device also includes: a coupling, a first bearing, a second bearing, the upper end of the screw is connected to the output end of the stepper motor through the coupling, the upper part of the screw is rotatably connected to the middle plate of the slide fixing frame through the first bearing, and the lower part of the screw is rotatably connected to the bottom plate of the slide fixing frame through the second bearing.

[0014] Furthermore, the stepper motor drive controller is a programmable logic controller (PLC); and the air circuit drive controller is a programmable logic controller (PLC).

[0015] Furthermore, the tank body to be tested is an empty tank to be tested into which water is injected.

[0016] Furthermore, the high-definition monitoring device also includes an image monitor; a high-definition monitoring camera establishes a communication connection with the image monitor.

[0017] Furthermore, the electrical control device includes a touch screen, which establishes a communication connection with the stepper motor drive controller and the air path drive controller.

[0018] Furthermore, the empty tank leak detector also includes a switching power supply, which supplies power to the stepper motor drive controller, the air circuit drive controller, the image monitor, and the touch screen.

[0019] The utility model has the following beneficial effects:

[0020] 1. Improve production efficiency: This device adopts PLC control system and high-definition monitoring system to realize the automation of the testing process, reduce manual operation, and improve detection efficiency and accuracy.

[0021] 2. Improve product quality: This device uses a high-precision pressure sensor to accurately control the gas pressure, achieve precise control of the gas pressure, improve detection accuracy, and help improve the level of product quality control.

[0022] 3. Reduce enterprise costs: timely discover and solve potential leakage problems, reduce the risk of product recalls caused by leakage, and reduce enterprise costs.

[0023] 4. Ensure product safety: In the food industry, ensure the sealing of food packaging, guarantee food quality, and reduce the risk of drug and food contamination.

[0024] 5. Wide applicability: It can be used for sealing detection of canned food, beverages, pharmaceutical preparations and other products of various shapes and specifications to meet the needs of different industries. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0026] Figure 1 This is a schematic diagram of the overall structure of the empty tank leak detector;

[0027] Figure 2 This is a three-dimensional diagram of the mechanical part of the empty tank leak detector.

[0028] Reference numerals:

[0029] In the figure: 1-sealing plate, 2-tracheal short circuit, 3-sealing plate bracket, 4-screw, 5-slider, 6-trachea, 7-stepping motor, 8-control valve, 9-slide, 10-vacuum generator, 11-pressure gauge, 12-strong magnetic block, 13-suction solenoid valve, 14-discharge valve, 15-stepping motor drive controller, 16-air path drive controller, 17-image monitor, 18-touch screen, 19-switching power supply, 20-high-definition surveillance camera, 21-coupling, 22-first bearing, 23-second bearing, 24-base plate, 25-guide column, 26-slide fixing bracket. DETAILED DESCRIPTION

[0030] To make the objectives, technical solutions, and advantages of the present invention more clearly apparent, the present invention is described below using specific embodiments illustrated in the accompanying drawings. However, it should be understood that these descriptions are merely illustrative and are not intended to limit the scope of the present invention. Furthermore, descriptions of known structures and technologies are omitted in the following description to avoid unnecessary confusion regarding the concepts of the present invention.

[0031] Example:

[0032] The present embodiment is described with reference to the accompanying drawings. An empty tank leak detector includes a mechanical device, an electrical control device, a monitoring device, and an air circuit.

[0033] The mechanical device includes: a sealing plate 1, a sealing plate bracket 3, a screw 4, a slider 5, a slideway support assembly, and a strong magnetic block 12;

[0034] The electrical control device includes: a stepper motor 7, a stepper motor drive controller 15, and the stepper motor drive controller 15 is electrically connected to the stepper motor 7 and is used to drive the stepper motor 7;

[0035] The high-definition monitoring device includes: a high-definition monitoring camera 20 for monitoring the tank under test;

[0036] The gas circuit includes: a gas pipe short circuit 2, a gas pipe 6, a control valve 8, a vacuum generator 10, a pressure gauge 11, an air suction solenoid valve 13, a discharge valve 14, and a gas circuit drive controller 16;

[0037] A stepper motor 7 is provided on the top of the slide support assembly, and a screw 4 is provided inside the slide support assembly. The top of the screw 4 is connected to the output end of the stepper motor 7. A slider 5 is slidably installed on the slide of the slide support assembly, and the slider 5 is threadedly engaged with the screw 4. A sealing plate bracket 3 is installed on the outside of the slider 5. The lower end of the sealing plate bracket 3 is connected to the sealing plate 1 through an air pipe short circuit 2. The sealing plate 1 is located directly above the tank body to be tested, and the tank body to be tested is placed on a strong magnetic block 12;

[0038] The air pipe short circuit 2 is connected to the lower interface of the air suction solenoid valve 13 and the discharge valve 14 through the air pipe 6. The upper interface of the air suction solenoid valve 13 is connected to the outlet end of the vacuum generator 10. The air inlet end of the vacuum generator 10 is connected to one end of the pressure gauge 11. The other end of the pressure gauge 11 is connected to the control valve 8. The air circuit drive controller 16 is connected to the air suction solenoid valve 13 and the discharge valve 14.

[0039] Furthermore, the slide support assembly includes a slide 9, a guide column 25, and a slide fixing frame 26; the slide 9 is provided on the rear side plate of the slide fixing frame 26, the bottom end of the guide column 25 is fixed on the bottom plate 24 of the slide fixing frame 26, and the top end of the guide column 25 is fixed on the top plate of the slide fixing frame 26, and the slider 5 slides with the guide column 25.

[0040] Furthermore, the mechanical device also includes: a coupling 21, a first bearing 22, a second bearing 23, the upper end of the screw 4 is connected to the output end of the stepper motor 7 through the coupling 21, the upper part of the screw 4 is rotatably connected to the middle plate of the slide fixing frame 26 through the first bearing 22, and the lower part of the screw 4 is rotatably connected to the bottom plate 24 of the slide fixing frame 26 through the second bearing 23.

[0041] Furthermore, the stepper motor drive controller 15 is a programmable logic controller (PLC); and the air circuit drive controller 16 is a programmable logic controller (PLC).

[0042] Furthermore, the tank body to be tested is an empty tank to be tested into which water is injected.

[0043] Furthermore, the high-definition monitoring device also includes an image monitor 17 ; the high-definition monitoring camera 20 establishes a communication connection with the image monitor 17 .

[0044] Furthermore, the electrical control device includes a touch screen 18 , which establishes a communication connection with the stepper motor drive controller 15 and the air path drive controller 16 .

[0045] Furthermore, the empty tank leak detector further includes a switching power supply 19 , which supplies power to the stepping motor drive controller 15 , the air circuit drive controller 16 , the image monitor 17 , and the touch screen 18 .

[0046] Working principle and process:

[0047] Water is injected into the empty can to be tested, and the can is pressurized by atmospheric pressure. At the same time, the can is sealed, and the remaining air in the can is extracted by a negative pressure device to form a negative pressure. Whether there are bubbles in the water in the can is detected to determine whether there is a leak in the product, thereby detecting whether the seal of the empty can is intact.

[0048] The device uses a touch screen 18 to set the parameters of the slider 5, such as the stroke, speed, subdivision frequency, and type of the object to be tested, to control the operation of the air circuit driver 16, and to control the stepper motor driver controller 15 to drive the stepper motor 7 to rotate. The stepper motor 7 drives the screw 4 to rotate through the coupling 21, and the screw 4 drives the slider 5 to move the sealing plate 1 to the empty tank to be tested, so that the empty tank to be tested is sealed. The suction valve 13 is opened to extract vacuum. After the vacuum reaches the set value, the monitor 17 is used to observe whether there are bubbles in the empty tank. After the test is completed, the suction valve is closed and the discharge valve is opened. After the vacuum in the chamber is exhausted, the slider 5 is controlled to return the sealing plate 1 to the initial position to complete the detection work.

[0049] This device utilizes a PLC control system and high-definition monitoring system to automate the testing process, reducing manual operations and improving testing efficiency and accuracy. The monitor screen allows for clear visual inspection of the presence of bubbles within the tank. Equipped with a high-precision pressure sensor, the device precisely controls gas pressure, ensuring accurate test results. Multiple safety features, including ultra-low pressure protection and overcurrent protection, ensure the safety of both operators and equipment.

[0050] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. An empty tank leak detector, characterized in that: It consists of mechanical devices, electrical control devices, high-definition monitoring devices and gas circuits; The mechanical device comprises: a sealing plate (1), a sealing plate bracket (3), a screw (4), a slider (5), a slideway support assembly, and a strong magnetic block (12); The electrical control device comprises: a stepping motor (7), a stepping motor drive controller (15), the stepping motor drive controller (15) being electrically connected to the stepping motor (7) and used to drive the stepping motor (7); The high-definition monitoring device comprises: a high-definition monitoring camera (20) for monitoring the tank to be tested; The gas circuit comprises: a gas pipe short circuit (2), a gas pipe (6), a control valve (8), a vacuum generator (10), a pressure gauge (11), an air suction solenoid valve (13), a discharge valve (14), and a gas circuit drive controller (16); A stepper motor (7) is provided on the top of the slideway support assembly, a screw rod (4) is provided inside the slideway support assembly, the top of the screw rod (4) is connected to the output end of the stepper motor (7), a slider (5) is slidably mounted on the slideway of the slideway support assembly, and the slider (5) is threadedly matched with the screw rod (4), a sealing plate bracket (3) is installed on the outside of the slider (5), the lower end of the sealing plate bracket (3) is connected to the sealing plate (1) through an air pipe short circuit (2), the sealing plate (1) is located directly above the tank body to be tested, and the tank body to be tested is placed on a strong magnetic block (12); The air pipe short circuit (2) is connected to the lower interface of the air suction solenoid valve (13) and the discharge valve (14) through the air pipe (6); the upper interface of the air suction solenoid valve (13) is connected to the outlet end of the vacuum generator (10); the air inlet end of the vacuum generator (10) is connected to one end of the pressure gauge (11); the other end of the pressure gauge (11) is connected to the control valve (8); and the air circuit drive controller (16) is connected to the air suction solenoid valve (13) and the discharge valve (14).

2. The empty tank leak detector according to claim 1, characterized in that: The slide support assembly comprises a slide (9), a guide column (25), and a slide fixing frame (26); the slide (9) is provided on the rear side plate of the slide fixing frame (26); the bottom end of the guide column (25) is fixed on the bottom plate (24) of the slide fixing frame (26); the top end of the guide column (25) is fixed on the top plate of the slide fixing frame (26); and the slider (5) is slidably matched with the guide column (25).

3. The empty tank leak detector according to claim 2, characterized in that: The mechanical device further comprises: a coupling (21), a first bearing (22), a second bearing (23), the upper end of the screw rod (4) being connected to the output end of the stepping motor (7) via the coupling (21), the upper part of the screw rod (4) being rotatably connected to the middle plate of the slideway fixing frame (26) via the first bearing (22), and the lower part of the screw rod (4) being rotatably connected to the bottom plate (24) of the slideway fixing frame (26) via the second bearing (23).

4. The empty tank leak detector according to claim 3, characterized in that: The stepper motor drive controller (15) is a programmable logic controller (PLC); the air path drive controller (16) is a programmable logic controller (PLC).

5. The empty tank leak detector according to claim 4, characterized in that: The tank body to be tested is a tank body into which water is injected into the empty tank to be tested.

6. The empty tank leak detector according to claim 4, characterized in that: The high-definition monitoring device further includes an image monitor (17); a high-definition monitoring camera (20) establishes a communication connection with the image monitor (17).

7. The empty tank leak detector according to claim 6, characterized in that: The electrical control device includes a touch screen (18), and the touch screen (18) establishes a communication connection with the stepping motor drive controller (15) and the air path drive controller (16).

8. The empty tank leak detector according to claim 7, characterized in that: The invention also includes a switching power supply (19), which supplies power to the stepping motor drive controller (15), the air path drive controller (16), the image monitor (17), and the touch screen (18).

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