Negative pressure leakage tester for detecting sealing performance of steel drum

Abstract

The invention discloses a negative pressure leakage testing machine for detecting the sealing performance of a steel drum, and relates to the technical field of negative pressure leakage testing machines, the negative pressure leakage testing machine comprises a leakage testing machine body, the top of the leakage testing machine body is slidably provided with an air tightness detection device, and a steel drum to be detected is placed in the leakage testing machine body. According to the negative pressure leakage testing machine for detecting the sealing performance of the steel drum, the upper sealing air bag and the lower sealing air bag expand and make contact with an inlet of the to-be-detected steel drum, sealing of the to-be-detected steel drum is completed, the accuracy of sealing performance detection of the to-be-detected steel drum is improved, the to-be-detected steel drum is pressed into water in the water tank, and the sealing performance of the to-be-detected steel drum is improved. The leakage point continuously generates bubbles, so that the position of a defect point of the to-be-detected steel drum is conveniently determined, the to-be-detected steel drum is vibrated through contact between the pressing plate and the to-be-detected steel drum, an air film attached to the leakage point is loosened through vibration, bubble separation is promoted, bubbles are conveniently generated, and the detection accuracy is improved. Therefore, the defect points of the to-be-detected steel drum can be determined more quickly.

Description

Technical Field

[0001] The present invention relates to the technical field of negative pressure leak detectors, and particularly to a negative pressure leak detector for detecting the sealing performance of steel drums. Background Art

[0002] A steel drum refers to a metal container used for storing and transporting various liquids, solids or powdery materials. It is usually made of thin steel plates and has good strength and sealing performance. Its shape is generally cylindrical, and the top and bottom may be flat or arc-shaped. Steel drums are one of the traditional containers and play an important role in traditional containers. The function of steel drums has evolved from temporarily storing the contents to today's industrial packaging, sales packaging, transportation packaging, etc.; from production to circulation and consumption, it has become a continuous flow container and a means of long-term preservation of the contents. It can be said that steel drums have brought great changes and progress to human work and life. The sealing performance of steel drums is directly related to the safety and quality of the contained items. If the steel drum is not tightly sealed, it may cause leakage, deterioration of the items, and even lead to safety accidents and environmental pollution.

[0003] At present, the main methods for detecting the sealing performance of steel drums on the market are the positive pressure detection method and the manual detection method. The positive pressure detection method is to fill the steel drum with gas at a certain pressure and judge the sealing performance of the steel drum by observing the gas leakage situation. However, this method has certain safety hazards and is not easy to detect small leaks; the manual detection method mainly relies on the experience and senses of the detection personnel, such as applying soapy water and observing bubbles, etc. This method has low efficiency, strong subjectivity, and it is difficult to guarantee the accuracy of the detection results, which has brought certain adverse effects to the use process. In order to solve the deficiencies of the existing technology, we propose a negative pressure leak detector for detecting the sealing performance of steel drums. Summary of the Invention

[0004] The main purpose of the present invention is to provide a negative pressure leak detector for detecting the sealing performance of steel drums, which can effectively solve the problems in the background art.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is as follows: A negative pressure leak detector for detecting the sealing performance of steel drums, including a leak detection machine body, on the top of which a airtightness detection device is slidably installed, and a steel drum to be detected is placed inside the leak detection machine body; The airtightness detection device includes a moving frame, at both ends of the top of the moving frame, lifting motors are fixedly installed, at the bottom of the two lifting motors, a fixed frame is fixedly installed, on the left side inside the fixed frame, a clamping sleeve plate is rotatably installed, on the right side inside the fixed frame, a negative pressure leak detection device is fixedly installed, and on the left side of the top of the fixed frame, a vibration device is fixedly installed; The negative pressure leak detection device includes a rotating motor and a rotating plate. A steering drive wheel is fixedly installed at the output end of the rotating motor. A steering transmission wheel is fixedly installed on the right side of the rotating plate. Fixed telescopic rods are fixedly installed at both ends on the left side of the rotating plate. Positioning clamping plates are fixedly installed on the left sides of the two fixed telescopic rods. A side frame is fixedly installed on the right side of the positioning clamping plate. Telescopic cylinders are fixedly installed at the upper and lower ends on the right side of the side frame. Moving plates are fixedly installed at the output ends of the two telescopic cylinders. An upper connecting air tank is fixedly installed on the top of the moving plate. A pressure sensor is fixedly installed on the top of the upper connecting air tank. A negative pressure nozzle is fixedly connected to the left side of the upper connecting air tank. A negative pressure air pipe is fixedly connected to one end of the upper connecting air tank. The other end of the negative pressure air pipe is fixedly connected to a vacuum pump.

[0006] Preferably, a lower connecting air tank is fixedly installed at the bottom of the moving plate. A pressurizing nozzle is fixedly installed on the left side of the lower connecting air tank. A pressurizing air pipe is fixedly installed at one end of the lower connecting air tank. A gas booster pump is fixedly installed on the top of the pressurizing air pipe. Both the vacuum pump and the gas booster pump are fixedly installed on the right side of the top of the fixed frame. A clamping cylinder is fixedly installed on the right side of the fixed frame. The output end of the clamping cylinder is connected to the side frame. The rotating motor and the clamping cylinder are fixedly installed on the right side of the fixed frame. The steering drive wheel and the steering transmission wheel are both rotatably installed on the left side inside the fixed frame. The outer surface of the steering drive wheel meshes with the outer surface of the steering transmission wheel.

[0007] Preferably, the positioning clamping plate includes a limiting sleeve. A limiting groove is formed in the inner wall of the limiting sleeve. A positioning sleeve plate is movably sleeved inside the limiting sleeve. A socket hole corresponding to the inlet of the steel drum to be detected is formed inside the positioning sleeve plate. A plurality of limiting blocks are fixedly installed on the side of the positioning sleeve plate. The limiting blocks are slidably installed inside the limiting groove. A plurality of pressing springs are fixedly installed between the inner walls of the positioning sleeve plate and the limiting sleeve.

[0008] Preferably, an air pump is fixedly installed on one side of the side frame. Connecting air pipes are fixedly connected to both ends of the air pump. An upper sealing airbag is fixedly sleeved on the outer surface of the negative pressure nozzle. A lower sealing airbag is fixedly sleeved on the outer surface of the pressurizing nozzle. The upper sealing airbag and the lower sealing airbag are respectively communicated with the two connecting air pipes. Both the pressurizing nozzle and the negative pressure nozzle are movably sleeved inside the limiting sleeve.

[0009] Preferably, the leak detection machine body includes a fixed base, a support frame is fixedly installed on the top of the fixed base, walking grooves are opened on both sides of the top of the support frame, a moving motor is fixedly installed on one side of the top of the support frame, a driving gear is fixedly installed at the output end of the moving motor, a rotating screw rod is rotatably installed on the top of the support frame, a transmission gear is fixedly sleeved on the outer surface of one end of the rotating screw rod, the outer surface of the driving gear meshes with the outer surface of the transmission gear, a guiding track is fixedly installed on the left side inside the fixed base, a limiting baffle is fixedly installed on the right side of the guiding track, and a detection pool is fixedly installed on the right side inside the fixed base.

[0010] Preferably, the guiding track is inclined from the left side to the right side of the fixed base, and a groove corresponding to the outer surface of the steel barrel to be detected is opened on the left side of the limiting baffle.

[0011] Preferably, a fixed block is fixedly installed at the bottom of the moving frame, the fixed block is threadedly installed on the outer surface of the rotating screw rod, walking wheels are arranged on both sides of the bottom of the moving frame, and the walking wheels are rotatably installed inside the walking grooves.

[0012] Preferably, the detection pool includes a water tank, a stirring motor is fixedly installed on one side of the water tank, a stirring paddle is fixedly installed at the output end of the stirring motor, the stirring paddle is rotatably installed inside the water tank, and a drain port is fixedly communicated with one side of the bottom of the water tank.

[0013] Preferably, the vibration device includes a pressing frame, a pressing cylinder is fixedly installed on the top of the pressing frame, a rotating shaft is rotatably installed at the bottom of the pressing frame, a knocking motor is fixedly installed on one side of the pressing frame, the output end of the knocking motor is connected to the rotating shaft, a rotating cam is fixedly installed inside the rotating shaft, a pulling rod is rotatably installed at one end inside the rotating cam, a knocking rod is rotatably installed at the bottom of the pulling rod, movable telescopic rods are fixedly installed on both sides of the bottom of the pressing frame, pressing plates are fixedly installed at the bottoms of the two movable telescopic rods, vibration springs are movably sleeved inside the movable telescopic rods, the upper and lower ends of the vibration springs are respectively connected to the pressing frame and the pressing plates, a sleeve is fixedly installed on the top of the pressing plate, and the knocking rod is movably sleeved inside the sleeve.

[0014] Preferably, the pressing cylinder is fixedly installed on one side of the top of the fixed frame, and the pressing plate is sleeved on the outer surface of one end of the steel barrel to be detected.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. In the present invention, through the arranged guiding track and limiting baffle, the steel drum to be detected rolls into the inside of the limiting baffle along the guiding track under the influence of gravity and stays on the side of the limiting baffle, realizing the limitation of the steel drum to be detected. During the process of the positioning and clamping plate clamping the steel drum to be detected, the pressing spring, through the reaction force, makes the socket hole sleeve on the inlet of the steel drum to be detected, thereby realizing the positioning of the steel drum to be detected, achieving the automatic fixation and clamping of the steel drum to be detected, facilitating the subsequent detection of the sealing performance, and improving the automation of the device.

[0016] 2. In the present invention, through the arranged upper sealing airbag and lower sealing airbag, when the air pump works, air enters the inside of the upper sealing airbag and lower sealing airbag through the connecting air pipe. The upper sealing airbag and lower sealing airbag expand and come into contact with the inlet of the steel drum to be detected, completing the sealing of the steel drum to be detected and improving the accuracy of the sealing performance detection of the steel drum to be detected.

[0017] 3. In the present invention, the vacuum pump evacuates the inside of the steel drum to be detected, generating a negative pressure inside the steel drum to be detected. By extracting the air inside the steel drum to form a negative pressure environment, it simulates the external pressure that the steel drum to be detected may withstand during transportation or storage. If there is a leak in the steel drum to be detected, external air will seep into the drum, resulting in a change in the pressure inside the steel drum to be detected, realizing the detection of the sealing performance of the steel drum to be detected.

[0018] 4. In the present invention, through the arranged detection pool and gas booster pump, air enters the inside of the steel drum to be detected through the booster air pipe and booster air nozzle, increasing the air pressure inside the steel drum to be detected. The gas runs out through the defect points of the steel drum to be detected, and by pressing the steel drum to be detected into the water inside the water tank, continuous bubbles are generated at the leak point, thereby facilitating the determination of the position of the defect point of the steel drum to be detected.

[0019] 5. In the present invention, by adding corresponding active agents or water-soluble dyes inside the water tank, the problem that it is difficult to visually identify tiny leaks because the bubbles generated in water are not obvious is solved, facilitating the determination of the defect points.

[0020] 6. In the present invention, through the arranged vibration device, the knocking rod hits the top of the pressing plate and comes into contact with the steel drum to be detected through the pressing plate, causing the steel drum to be detected to vibrate. Through vibration, the air film attached to the leak point is loosened, promoting the detachment of the bubbles and facilitating the generation of bubbles, thereby more quickly determining the defect points of the steel drum to be detected. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is the overall structural schematic diagram of the present invention; Figure 2 is the structural schematic diagram of the leak detection machine body of the present invention; Figure 3It is a schematic structural diagram of the airtightness detection device of the present invention; Figure 4 It is a schematic structural diagram of the negative pressure leak detection device of the present invention; Figure 5 It is a schematic structural diagram of the positioning clamping plate of the present invention; Figure 6 It is a schematic structural diagram of the back of the positioning clamping plate of the present invention; Figure 7 It is a schematic structural diagram of the detection pool of the present invention; Figure 8 It is a schematic structural diagram of the vibration device of the present invention.

[0022] In the figure: 1, leak detection machine body; 2, airtightness detection device; 3, steel drum to be detected; 4, vibration device; 11, fixed base; 12, support frame; 13, guiding track; 14, limiting baffle; 15, detection pool; 16, moving motor; 17, driving gear; 18, rotating screw; 19, transmission gear; 21, moving frame; 22, lifting motor; 23, fixed block; 24, walking wheel; 25, fixed frame; 26, clamping sleeve plate; 27, negative pressure leak detection device; 151, water tank; 152, stirring motor; 153, stirring paddle; 154, drain port; 271, rotating motor; 272, steering drive wheel; 273, clamping cylinder; 274, rotating plate; 275, steering transmission wheel; 276, fixed telescopic rod; 277, positioning clamping plate; 278, pressurized air pipe; 279, gas booster pump; 2710, vacuum pump; 2711, negative pressure air pipe; 2712, side frame; 2713, telescopic cylinder; 2714, movable plate; 2715, upper connecting air tank; 2716, air pressure sensor; 2717, negative pressure nozzle; 2718, upper sealing airbag; 2719, lower connecting air tank; 2720, pressurized nozzle; 2721, lower sealing airbag; 2722, air filling pump; 2723, connecting air pipe; 2771, limiting sleeve; 2772, limiting groove; 2773, positioning sleeve plate; 2774, limiting block; 2775, socket hole; 2776, pressing spring; 41, pressing frame; 42, pressing cylinder; 43, knocking motor; 44, rotating shaft; 45, rotating cam; 46, pulling rod; 47, knocking rod; 48, movable telescopic rod; 49, vibration spring; 410, pressing plate; 411, sleeve. Specific embodiments

[0023] In order to make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

[0024] Example 1, as Figures 1-3As shown in the figure, a negative pressure leak detector for detecting the sealing performance of steel drums includes a leak detection body 1 and an airtightness detection device 2. The airtightness detection device 2 is slidably installed on the top of the leak detection body 1, and a steel drum 3 to be detected is placed inside the leak detection body 1; As Figure 3 shown in the figure, the airtightness detection device 2 includes a moving frame 21, a clamping sleeve plate 26 and a negative pressure leak detection device 27. Lifting motors 22 are fixedly installed at both ends of the top of the moving frame 21. Fixed frames 25 are fixedly installed at the bottoms of the two lifting motors 22. A clamping sleeve plate 26 is rotatably installed on the left side inside the fixed frame 25, and a negative pressure leak detection device 27 is fixedly installed on the right side inside the fixed frame 25. A vibration device 4 is fixedly installed on the left side of the top of the fixed frame 25. By sleeving the clamping sleeve plate 26 on the tail end of the steel drum 3 to be detected and the clamping cylinder 273 extending, the positioning clamping plate 277 presses on the top of the steel drum 3 to be detected to clamp and fix the steel drum 3 to be detected.

[0025] As Figure 2 shown in the figure, the leak detection body 1 includes a fixed base 11, a guide track 13 and a limit baffle 14. A support frame 12 is fixedly installed on the top of the fixed base 11. Walking grooves are opened on both sides of the top of the support frame 12. A moving motor 16 is fixedly installed on one side of the top of the support frame 12. A driving gear 17 is fixedly installed at the output end of the moving motor 16. A rotating screw 18 is rotatably installed on the top of the support frame 12. A transmission gear 19 is fixedly sleeved on the outer surface of one end of the rotating screw 18. The outer surface of the driving gear 17 meshes with the outer surface of the transmission gear 19. The guide track 13 is fixedly installed on the left side inside the fixed base 11. The right side of the guide track 13 is fixedly installed with the limit baffle 14. A detection pool 15 is fixedly installed on the right side inside the fixed base 11.

[0026] Among them, the guide track 13 is inclined from left to right on the left side of the fixed base 11. A groove corresponding to the outer surface of the steel drum 3 to be detected is opened on the left side of the limit baffle 14. When the steel drum 3 to be detected is placed on the top of the guide track 13, the steel drum 3 to be detected rolls into the inside of the limit baffle 14 under the influence of gravity and stays on the side of the limit baffle 14 to limit the steel drum 3 to be detected. At this time, the clamping cylinder 273 extends, making the positioning clamping plate 277 approach one end of the steel drum 3 to be detected, pushing one end of the steel drum 3 to be detected to the side of the clamping sleeve plate 26, and at the same time the positioning clamping plate 277 presses on the other end of the steel drum 3 to be detected to clamp the steel drum 3 to be detected.

[0027] Among them, a fixed block 23 is fixedly installed at the bottom of the moving frame 21. The fixed block 23 is threadedly installed on the outer surface of the rotating screw 18. Walking wheels 24 are arranged on both sides of the bottom of the moving frame 21. The walking wheels 24 are rotatably installed inside the walking grooves.

[0028] Among them, the positioning and clamping plate 277 includes a limiting sleeve 2771 and a positioning sleeve plate 2773. A limiting groove 2772 is formed in the inner wall of the limiting sleeve 2771. The positioning sleeve plate 2773 is movably sleeved inside the limiting sleeve 2771. A socket hole 2775 corresponding to the inlet of the steel drum 3 to be detected is formed inside the positioning sleeve plate 2773. A plurality of limiting blocks 2774 are fixedly installed on the side of the positioning sleeve plate 2773. The limiting blocks 2774 are slidably installed inside the limiting groove 2772. A plurality of pressing springs 2776 are fixedly installed between the inner walls of the positioning sleeve plate 2773 and the limiting sleeve 2771. Generally, there is a large opening for pouring or injecting items and an additional smaller inlet at the top of the steel drum 3 to be detected, which is mainly used for ventilation, exhaust or installing specific devices and can be blocked according to requirements. The socket holes 2775 on both sides inside the positioning sleeve plate 2773 correspond to the holes of the steel drum 3 to be detected. During the process of the positioning and clamping plate 277 clamping the steel drum 3 to be detected, the positioning sleeve plate 2773 will first come into contact with the inlet of the steel drum 3 to be detected. At this time, the pressing spring 2776 is compressed by force. When the rotation motor 271 controls the steering drive wheel 272 to drive the steering transmission wheel 275 to rotate, at this time, the rotating plate 274 drives the positioning and clamping plate 277 to rotate. When the socket hole 2775 inside the positioning sleeve plate 2773 rotates to correspond to the inlet of the steel drum 3 to be detected, the pressing spring 2776 exerts a reaction force to make the socket hole 2775 sleeve on the inlet of the steel drum 3 to be detected, thereby realizing the positioning of the steel drum 3 to be detected. Subsequently, the telescopic cylinder 2713 controls the movable plate 2714 to move, so that the negative pressure nozzle 2717 and the pressure boosting nozzle 2720 are inserted into the inlet of the steel drum 3 to be detected, realizing the automatic blocking of the inlet of the steel drum 3 to be detected.

[0029] Embodiment 2, as Figures 1-6 shown, a negative pressure leak tester for detecting the sealing performance of a steel drum. The negative pressure leak detection device 27 includes a rotation motor 271 and a rotating plate 274. The output end of the rotation motor 271 is fixedly installed with a steering drive wheel 272. The right side of the rotating plate 274 is fixedly installed with a steering transmission wheel 275. Both ends on the left side of the rotating plate 274 are fixedly installed with fixed telescopic rods 276. The left sides of the two fixed telescopic rods 276 are fixedly installed with a positioning and clamping plate 277. The right side of the positioning and clamping plate 277 is fixedly installed with a side frame 2712. Both the upper and lower ends on the right side of the side frame 2712 are fixedly installed with telescopic cylinders 2713. The output ends of the two telescopic cylinders 2713 are fixedly installed with a movable plate 2714. The top of the movable plate 2714 is fixedly installed with an upper connecting air box 2715. The top of the upper connecting air box 2715 is fixedly installed with a pressure sensor 2716. The left side of the upper connecting air box 2715 is fixedly communicated with a negative pressure nozzle 2717. One end of the upper connecting air box 2715 is fixedly communicated with a negative pressure air pipe 2711. The other end of the negative pressure air pipe 2711 is fixedly connected with a vacuum pump 2710.

[0030] Among them, a lower connecting air tank 2719 is fixedly installed at the bottom of the movable plate 2714. A supercharging air nozzle 2720 is fixedly installed on the left side of the lower connecting air tank 2719. One end of the lower connecting air tank 2719 is fixedly installed with a supercharging air pipe 278. A gas supercharging pump 279 is fixedly installed at the top of the supercharging air pipe 278.

[0031] Among them, both the vacuum pump 2710 and the gas supercharging pump 279 are fixedly installed on the right side of the top of the fixing frame 25. A clamping cylinder 273 is fixedly installed on the right side of the fixing frame 25. The output end of the clamping cylinder 273 is connected to the side frame 2712. The rotating motor 271 and the clamping cylinder 273 are fixedly installed on the right side of the fixing frame 25. The steering drive wheel 272 and the steering transmission wheel 275 are both rotatably installed on the left side inside the fixing frame 25. The outer surface of the steering drive wheel 272 meshes with the outer surface of the steering transmission wheel 275.

[0032] In order to prevent the positioning clamping plate 277 from continuously rotating, resulting in entanglement of the supercharging air pipe 278 and the negative pressure air pipe 2711 during the rotation of the positioning clamping plate 277. When the positioning clamping plate 277 clamps the steel drum 3 to be detected and needs to position the steel drum 3 to be detected, when the rotating motor 271 controls the steering drive wheel 272 to rotate, the steering drive wheel 272 drives through the steering transmission wheel 275, so that the positioning clamping plate 277 first rotates 180 degrees clockwise, then resets, and then rotates 180 degrees counterclockwise, so that the positioning clamping plate 277 can position the steel drum 3 to be detected while avoiding entanglement of the supercharging air pipe 278 and the negative pressure air pipe 2711.

[0033] Such as Figure 6 As shown, an air charging pump 2722 is fixedly installed on one side of the side frame 2712. Both ends of the air charging pump 2722 are fixedly connected with connecting air pipes 2723. An upper sealing airbag 2718 is fixedly sleeved on the outer surface of the negative pressure air nozzle 2717. A lower sealing airbag 2721 is fixedly sleeved on the outer surface of the supercharging air nozzle 2720. The upper sealing airbag 2718 and the lower sealing airbag 2721 are respectively communicated with the connecting air pipes 2723 at both ends. Both the supercharging air nozzle 2720 and the negative pressure air nozzle 2717 are movably sleeved inside the limiting sleeve 2771.

[0034] In order to further improve the sealing performance of the steel drum 3 to be detected, when the positioning sleeve plate 2773 rotates so that the inlet of the steel drum 3 to be detected is clamped inside the socket hole 2775, the telescopic air cylinder 2713 controls the movable plate 2714 to approach the direction of the limit sleeve 2771, so that the negative pressure nozzle 2717 and the pressurizing nozzle 2720 are inserted into the inlet of the steel drum 3 to be detected. At this time, the air charging pump 2722 works, so that air enters the upper sealing airbag 2718 and the lower sealing airbag 2721 through the connecting air pipe 2723. The upper sealing airbag 2718 and the lower sealing airbag 2721 expand and contact the inlet of the steel drum 3 to be detected, completing the sealing of the steel drum 3 to be detected. At this time, the vacuum pump 2710 evacuates the inside of the steel drum 3 to be detected, generating a negative pressure inside the steel drum 3 to be detected. By extracting the air inside the steel drum 3 to be detected to form a negative pressure environment, it simulates the external pressure that the steel drum 3 to be detected may withstand during transportation or storage. If there are leaks in the steel drum 3 to be detected, such as welds, seams or micropores, external air will seep into the drum, resulting in a change in the pressure inside the steel drum 3 to be detected. Thus, the air pressure sensor 2716 detects the change in the negative pressure inside the steel drum 3 to be detected and detects the sealing condition inside the steel drum 3 to be detected.

[0035] Embodiment 3, as Figures 1-8 shown, a negative pressure leak detector for detecting the sealing performance of a steel drum, the detection pool 15 includes a water tank 151. One side of the water tank 151 is fixedly installed with a stirring motor 152. The output end of the stirring motor 152 is fixedly installed with a stirring paddle 153. The stirring paddle 153 is rotatably installed inside the water tank 151. One side of the bottom of the water tank 151 is fixedly communicated with a drain port 154.

[0036] By arranging the stirring paddle 153 inside the water tank 151, after adding water to the water tank 151, a small amount of surfactant (such as dishwashing liquid, isopropyl alcohol) can be added to the water to reduce the surface tension of the liquid, making it easier for the gas of a small leak to form visible bubbles, or a water-soluble dye (such as methylene blue) can be added. The contrast is enhanced through the color difference generated by the agitation of the bubbles, and through the stirring of the stirring paddle 153, it is mixed evenly, thus solving the problem that it is difficult to visually identify with the naked eye due to the inconspicuous bubbles generated by a small leak in the water.

[0037] As Figure 8As shown in the figure, the vibration device 4 includes a pressing frame 41 and a knocking rod 47. A pressing cylinder 42 is fixedly installed at the top of the pressing frame 41. A rotating shaft 44 is rotatably installed at the bottom of the pressing frame 41. A knocking motor 43 is fixedly installed on one side of the pressing frame 41. The output end of the knocking motor 43 is connected to the rotating shaft 44. A rotating cam 45 is fixedly installed inside the rotating shaft 44. One end inside the rotating cam 45 is rotatably installed with a pulling rod 46. The bottom of the pulling rod 46 is rotatably installed with the knocking rod 47. Both sides of the bottom of the pressing frame 41 are fixedly installed with movable telescopic rods 48. The bottoms of the two ends of the movable telescopic rods 48 are fixedly installed with a pressing plate 410. A vibration spring 49 is movably sleeved inside the movable telescopic rod 48. The upper and lower ends of the vibration spring 49 are respectively connected to the pressing frame 41 and the pressing plate 410. A sleeve 411 is fixedly installed at the top of the pressing plate 410. The knocking rod 47 is movably sleeved inside the sleeve 411.

[0038] Among them, the pressing cylinder 42 is fixedly installed on one side of the top of the fixed frame 25, and the pressing plate 410 is sleeved on the outer surface of one end of the steel drum 3 to be detected.

[0039] In addition, the knocking motor 43 controls the rotation of the rotating shaft 44 to make the rotating cam 45 rotate, and drives the pulling rod 46 to swing up and down. During the up and down swing of the pulling rod 46, the pulling rod 46 pulls the knocking rod 47 to move up and down, so that the knocking rod 47 hits the top of the pressing plate 410 and contacts the steel drum 3 to be detected through the pressing plate 410, causing the steel drum 3 to be detected to vibrate. Through vibration, the air film attached to the leakage point is loosened, promoting the detachment of bubbles and making the bubbles more obvious.

[0040] It should be noted that the present invention is a negative pressure leak detector for detecting the sealing performance of steel drums. When in use, the steel drum 3 to be detected is placed on the top of the guiding track 13. Affected by gravity, the steel drum 3 to be detected rolls through the guiding track 13 into the inside of the limit baffle 14 and stays on the side of the limit baffle 14. At this time, the moving motor 16 controls the driving gear 17 to rotate, and through the rotation of the transmission gear 19, the rotating screw 18 rotates. The fixed block 23 moves on the outer surface of the rotating screw 18, and the moving frame 21 moves above the limit baffle 14. Subsequently, the lifting motor 22 controls the fixed frame 25 to descend. The clamping sleeve plate 26 and the negative pressure leak detection device 27 are respectively located on both sides of the steel drum 3 to be detected. Subsequently, the clamping cylinder 273 extends, causing the positioning clamping plate 277 to approach one end of the steel drum 3 to be detected, and pushing one end of the steel drum 3 to be detected to the side of the clamping sleeve plate 26. During the process of the positioning clamping plate 277 clamping the steel drum 3 to be detected, the positioning sleeve plate 2773 will first contact the inlet of the steel drum 3 to be detected. At this time, the pressing spring 2776 is compressed under force. The steering drive wheel 272 drives the limit sleeve 2771 and the positioning sleeve plate 2773 to rotate clockwise by 180 degrees first, then reset, and then rotate counterclockwise by 180 degrees. When the socket hole 2775 inside the positioning sleeve plate 2773 rotates to correspond to the inlet of the steel drum 3 to be detected, the pressing spring 2776 exerts a reaction force to socket the socket hole 2775 on the inlet of the steel drum 3 to be detected, thereby realizing the positioning of the steel drum 3 to be detected. Subsequently, the clamping cylinder 273 continues to extend, and the limit sleeve 2771 and the clamping sleeve plate 26 clamp the steel drum 3 to be detected; The telescopic cylinder 2713 controls the movable plate 2714 to approach the limit sleeve 2771, so that the negative pressure nozzle 2717 and the pressurizing nozzle 2720 are inserted into the inlet of the steel drum 3 to be detected. At this time, the air filling pump 2722 works, so that air enters the inside of the upper sealing airbag 2718 and the lower sealing airbag 2721 through the connecting air pipe 2723. The upper sealing airbag 2718 and the lower sealing airbag 2721 expand and contact the inlet of the steel drum 3 to be detected, completing the sealing of the steel drum 3 to be detected. At this time, the negative pressure air pipe 2711 evacuates the inside of the steel drum 3 to be detected, causing a negative pressure to be generated inside the steel drum 3 to be detected. By pumping the air inside the steel drum 3 to be detected to form a negative pressure environment, the external pressure that the steel drum 3 to be detected may withstand during transportation or storage is simulated. Subsequently, the pressure holding stage usually lasts for several seconds to several minutes. When there is no leakage in the steel drum 3 to be detected, the air pressure sensor 2716 detects that the pressure inside the steel drum 3 to be detected remains stable. When there is a leakage in the steel drum 3 to be detected, such as at the weld, joint or micropore, external air enters the barrel through the defect point, resulting in a pressure rise. The air pressure sensor 2716 detects and records the pressure change value, and compares the pressure change value with a preset threshold. If it exceeds the threshold, it is determined to be unqualified; In order to further determine the position of the specific defect points of the steel drum 3 to be detected, at this time, the moving motor 16 controls the driving gear 17 to rotate in the reverse direction, causing the rotating screw 18 to rotate in the reverse direction, and the moving frame 21 moves to the top of the detection pool 15. At this time, the corresponding active agent or water-soluble dye is added to the inside of the water tank 151, and the stirring paddle 153 is started to mix the active agent or water-soluble dye evenly. The gas booster pump 279 operates, enabling air to enter the inside of the steel drum 3 to be detected through the booster air pipe 278 and the booster air nozzle 2720, increasing the air pressure inside the steel drum 3 to be detected. The gas runs out through the defect points of the steel drum 3 to be detected. Finally, the lifting motor 22 controls the fixed frame 25 to descend, pressing the steel drum 3 clamped by the clamping sleeve plate 26 and the negative pressure leak detection device 27 into the water inside the water tank 151. At this time, continuous bubbles are generated at the leakage point. Subsequently, the pressing cylinder 42 controls the pressing frame 41 to descend, and the pressing plate 410 fits on the top of the steel drum 3 to be detected. The knocking motor 43 controls the rotating shaft 44 to rotate, causing the rotating cam 45 to rotate and driving the pulling rod 46 to swing up and down. During the up and down swing of the pulling rod 46, the pulling rod 46 pulls the knocking rod 47 to move up and down, causing the knocking rod 47 to hit the top of the pressing plate 410 and contacting the steel drum 3 through the pressing plate 410, causing the steel drum 3 to be detected to vibrate. Through the vibration, the air film attached to the leakage point is loosened, promoting the detachment of the bubbles, and based on the position where the bubbles are generated, the position of the defect points of the steel drum 3 to be detected is determined. At the same time, the rotation motor 271 is used to control the rotation of the positioning clamping plate 277 to adjust the position of the steel drum 3 to be detected.

[0041] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art of this industry should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A negative pressure leak tester for detecting the sealing performance of steel drums, comprising a leak testing machine body (1), characterized in that: A leak detection device (2) is slidably installed on the top of the leak detection machine body (1), and a steel drum (3) to be detected is placed inside the leak detection machine body (1). The airtightness detection device (2) includes a moving frame (21). At both ends of the top of the moving frame (21), lifting motors (22) are fixedly installed. At the bottom of both lifting motors (22), a fixed frame (25) is fixedly installed. On the left side inside the fixed frame (25), a clamping sleeve plate (26) is rotatably installed. On the right side inside the fixed frame (25), a negative pressure leak detection device (27) is fixedly installed. On the left side of the top of the fixed frame (25), a vibration device (4) is fixedly installed. The negative pressure leak detection device (27) includes a rotary motor (271) and a rotating plate (274). The output end of the rotary motor (271) is fixedly installed with a steering drive wheel (272). On the right side of the rotating plate (274), a steering transmission wheel (275) is fixedly installed. At both ends on the left side of the rotating plate (274), fixed telescopic rods (276) are fixedly installed. At the left side of both fixed telescopic rods (276), a positioning clamping plate (277) is fixedly installed. On the right side of the positioning clamping plate (277), a side frame (2712) is fixedly installed. At the upper and lower ends on the right side of the side frame (2712), telescopic cylinders (2713) are fixedly installed. The output ends of both telescopic cylinders (2713) are fixedly installed with a movable plate (2714). On the top of the movable plate (2714), an upper connecting air tank (2715) is fixedly installed. On the top of the upper connecting air tank (2715), a pressure sensor (2716) is fixedly installed. On the left side of the upper connecting air tank (2715), a negative pressure air nozzle (2717) is fixedly connected. One end of the upper connecting air tank (2715) is fixedly connected with a negative pressure air pipe (2711). The other end of the negative pressure air pipe (2711) is fixedly connected with a vacuum pump (2710).

2. The negative pressure leak detector for detecting the sealing performance of steel drums according to claim 1, wherein: On the bottom of the movable plate (2714), a lower connecting air tank (2719) is fixedly installed. On the left side of the lower connecting air tank (2719), a boosting air nozzle (2720) is fixedly installed. One end of the lower connecting air tank (2719) is fixedly installed with a boosting air pipe (278). On the top of the boosting air pipe (278), a gas booster pump (279) is fixedly installed. Both the vacuum pump (2710) and the gas booster pump (279) are fixedly installed on the right side of the top of the fixed frame (25). On the right side of the fixed frame (25), a clamping cylinder (273) is fixedly installed. The output end of the clamping cylinder (273) is connected with the side frame (2712). The rotary motor (271) and the clamping cylinder (273) are fixedly installed on the right side of the fixed frame (25). Both the steering drive wheel (272) and the steering transmission wheel (275) are rotatably installed on the left side inside the fixed frame (25). The outer surface of the steering drive wheel (272) is meshed with the outer surface of the steering transmission wheel (275).

3. The negative pressure leak detector for detecting the sealing performance of steel drums according to claim 2, characterized in that: The positioning and clamping plate (277) includes a limit sleeve (2771), a limit groove (2772) is formed on the inner wall of the limit sleeve (2771), a positioning sleeve plate (2773) is movably sleeved inside the limit sleeve (2771), a socket hole (2775) corresponding to the inlet of the steel drum (3) to be detected is formed inside the positioning sleeve plate (2773), a plurality of limit blocks (2774) are fixedly installed on the side of the positioning sleeve plate (2773), the limit blocks (2774) are slidably installed inside the limit groove (2772), and a plurality of pressing springs (2776) are fixedly installed between the inner walls of the positioning sleeve plate (2773) and the limit sleeve (2771).

4. A negative pressure leak tester for detecting the sealing performance of steel drums according to claim 3, characterized in that: An air charging pump (2722) is fixedly installed on one side of the side frame (2712), both ends of the air charging pump (2722) are fixedly communicated with a connecting air pipe (2723), an upper sealing airbag (2718) is fixedly sleeved on the outer surface of the negative pressure air nozzle (2717), a lower sealing airbag (2721) is fixedly sleeved on the outer surface of the boosting air nozzle (2720), the upper sealing airbag (2718) and the lower sealing airbag (2721) are respectively communicated with the connecting air pipes (2723) at both ends, and the boosting air nozzle (2720) and the negative pressure air nozzle (2717) are both movably sleeved inside the limit sleeve (2771).

5. The negative pressure leak detector for detecting the sealing performance of steel drums according to claim 1, characterized in that: The leak detection machine body (1) includes a fixed base (11), a support frame (12) is fixedly installed on the top of the fixed base (11), walking grooves are formed on both sides of the top of the support frame (12), a moving motor (16) is fixedly installed on one side of the top of the support frame (12), a driving gear (17) is fixedly installed at the output end of the moving motor (16), a rotating screw rod (18) is rotatably installed on the top of the support frame (12), a transmission gear (19) is fixedly sleeved on the outer surface of one end of the rotating screw rod (18), the outer surface of the driving gear (17) is meshed with the outer surface of the transmission gear (19), a guiding track (13) is fixedly installed on the left side inside the fixed base (11), a limit baffle (14) is fixedly installed on the right side of the guiding track (13), and a detection pool (15) is fixedly installed on the right side inside the fixed base (11).

6. The negative pressure leak detector for detecting the sealing performance of steel drums according to claim 5, characterized in that: The guiding track (13) is inclined from left to right on the left side of the fixed base (11), and a groove corresponding to the outer surface of the steel drum (3) to be detected is formed on the left side of the limit baffle (14).

7. A negative pressure leak tester for detecting the sealing performance of steel drums according to claim 6, characterized in that: A fixed block (23) is fixedly installed at the bottom of the moving frame (21), the fixed block (23) is threadedly installed on the outer surface of the rotating screw rod (18), walking wheels (24) are arranged on both sides of the bottom of the moving frame (21), and the walking wheels (24) are rotatably installed inside the walking grooves.

8. A negative pressure leak tester for detecting the sealing performance of steel drums according to claim 5, characterized in that: The detection cell (15) includes a water tank (151). One side of the water tank (151) is fixedly installed with a stirring motor (152). The output end of the stirring motor (152) is fixedly installed with a stirring paddle (153). The stirring paddle (153) is rotatably installed inside the water tank (151). One side of the bottom of the water tank (151) is fixedly communicated with a drain port (154).

9. A negative pressure leak tester for detecting the sealing performance of steel drums according to claim 1, characterized in that: The vibration device (4) includes a pressing frame (41). The top of the pressing frame (41) is fixedly installed with a pressing cylinder (42). The bottom of the pressing frame (41) is rotatably installed with a rotating shaft (44). One side of the pressing frame (41) is fixedly installed with a knocking motor (43). The output end of the knocking motor (43) is connected to the rotating shaft (44). A rotating cam (45) is fixedly installed inside the rotating shaft (44). One end inside the rotating cam (45) is rotatably installed with a pulling rod (46). The bottom of the pulling rod (46) is rotatably installed with a knocking rod (47). Both sides of the bottom of the pressing frame (41) are fixedly installed with movable telescopic rods (48). The bottoms of the two ends of the movable telescopic rods (48) are fixedly installed with a pressing plate (410). A vibration spring (49) is movably sleeved inside the movable telescopic rod (48). The upper and lower ends of the vibration spring (49) are respectively connected to the pressing frame (41) and the pressing plate (410). A sleeve (411) is fixedly installed on the top of the pressing plate (410). The knocking rod (47) is movably sleeved inside the sleeve (411).

10. A negative pressure leak tester for detecting the sealing performance of steel drums according to claim 9, characterized in that: The pressing cylinder (42) is fixedly installed on one side of the top of the fixed frame (25). The pressing plate (410) is sleeved on the outer surface of one end of the steel drum (3) to be detected.

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