A steel drum negative pressure testing device

Abstract

This invention discloses a negative pressure testing device for steel drums, relating to the field of negative pressure testing technology. Its key technical features include a mounting base, a control device mounted on one side of the top of the mounting base, a negative pressure transmitter mounted on the other side of the top of the mounting base, and a negative pressure buffer tank mounted on the top of the mounting base and behind the control device. The output end of the negative pressure transmitter is connected to the top of the negative pressure buffer tank via a negative pressure connecting pipe. A connecting end is installed on the upper part of one side of the outer wall of the negative pressure buffer tank, with a water storage component installed at one end and an external pipe end installed on the other side. By connecting the water storage component in series in the negative pressure circuit, the backflow water generated by the negative pressure deformation of the steel drum is completely trapped in the water storage tank, fundamentally preventing backflow water from entering the core negative pressure equipment such as the negative pressure transmitter and the negative pressure buffer tank. This completely solves the problems of backflow water damaging equipment, difficulty in draining accumulated water, and backflow water interfering with the stable application of negative pressure in existing technologies.

Description

Technical Field

[0001] This invention relates to the field of negative pressure testing technology, specifically to a negative pressure testing device for steel drums. Background Technology

[0002] As the most common metal storage and transportation container in the petroleum, chemical, coating, and hazardous materials industries, steel drums are directly related to production safety, logistics compliance, and environmental protection due to their sealing integrity and structural reliability. In actual storage and transportation scenarios, steel drums often experience internal and external pressure differences due to sudden temperature changes, altitude changes, negative pressure suction during loading and unloading, and internal cooling and contraction. Minor weld defects, inadequate sealing, and weak materials can easily induce leaks under such conditions, causing not only material loss but also potential safety accidents such as corrosion, poisoning, fire, and environmental pollution.

[0003] To control risks at the source, the industry generally regards negative pressure testing as a core item in the factory inspection, type testing, and in-service re-inspection of steel drums. This test creates a stable negative pressure inside the sealed drum to simulate a real negative pressure service environment, accurately detecting leaks and instability resistance in parts such as the drum body, welds, seals, and sealing components. Compared with traditional water immersion leak testing, it is more sensitive, quantifiable, and easily automated, and can efficiently detect micro-leakage and hidden structural defects.

[0004] Currently, negative pressure testing uses direct negative pressure connection. However, the backflow water after the steel drum deforms can easily enter the negative pressure machine, making water discharge inconvenient. Furthermore, the backflow water can also affect the continued application of negative pressure. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a steel drum negative pressure testing device. By connecting a water storage component in series in the negative pressure circuit, the backflow water generated by the negative pressure deformation of the steel drum is completely trapped in the water storage tank, thus preventing backflow water from entering core negative pressure equipment such as the negative pressure generator and negative pressure buffer tank.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a negative pressure testing device for a steel drum, comprising a mounting base, a control device mounted on one side of the top of the mounting base, a negative pressure transmitter mounted on the other side of the top of the mounting base, a negative pressure buffer tank mounted on the top of the mounting base and behind the control device, the output end of the negative pressure transmitter being connected to the top of the negative pressure buffer tank via a negative pressure connecting pipe, a connecting end being installed on the upper end of one side of the outer wall of the negative pressure buffer tank, a water storage component being mounted on one end of the connecting end, and an external pipe end being mounted on the other side of the water storage component; The water storage component includes a lid, with a cap connected to the top of the lid. Side connecting ends are symmetrically installed on the outer wall of the cap. A water storage tank is installed on the inner side of the lid. A drain pipe is connected to the lower end of the water storage tank. A water storage indicator is installed on the upper inner wall of the water storage tank. The water storage indicator includes support arms that are equidistantly distributed in a ring on the upper inner wall of the water storage tank. One end of the multiple support arms is fixed to a positioning ring. A liquid level float is slidably installed on the inner side of the positioning ring. An upper baffle ring is installed on the upper outer wall of the liquid level float. A blocking component that cooperates with the upper baffle ring is installed on the inner side of the side connecting ends.

[0007] Preferably, the negative pressure generator is used to generate negative pressure, and the upper end of the external pipe end is connected to the oil drum to be tested through a test pipe.

[0008] Preferably, the liquid level float has a hollow internal structure to generate greater buoyancy, and the outer diameter of the upper baffle ring is larger than the inner diameter of the positioning ring.

[0009] Preferably, the outer wall of the drain pipe is provided with a switch valve.

[0010] Preferably, the side connection end has an installation hole on its outer side and a connection hole on its inner side, the installation hole and the connection hole are connected, and the inner diameter of the connection hole is smaller than the inner diameter of the installation hole.

[0011] Preferably, the blocking component includes a feedback slide seat slidably disposed above the inner side of the side connection end, a slide groove is provided on the inner side of the side connection end corresponding to the feedback slide seat, a spring is installed at one end of the slide groove, a sliding arm is slidably mounted on the inner side of the feedback slide seat, guide rollers are rotatably mounted on both sides of the upper end of the sliding arm, and a sliding baffle is connected to the lower end of the sliding arm.

[0012] Preferably, a second groove is provided on the inner side of the feedback slide and at the position corresponding to the guide roller, and a slot is provided on the lower part of the inner side of the first groove and at the position corresponding to the sliding baffle, with the slot extending to the connection hole.

[0013] Preferably, the second slide is inclined outwards, and one end of the feedback slide has an inwardly inclined slope. The outer diameter of the upper retaining ring is smaller than the inner diameter of the cover, and the upper retaining ring corresponds to the position of the inclined slope.

[0014] Compared with the prior art, the present invention provides a steel drum negative pressure testing device with the following beneficial effects: by connecting a water storage component in series in the negative pressure circuit, the backflow water generated by the negative pressure deformation of the steel drum is completely intercepted in the water storage tank, thus fundamentally preventing backflow water from entering the core negative pressure equipment such as the negative pressure generator and the negative pressure buffer tank. This completely solves the pain points of the prior art, such as backflow water damaging the equipment, difficulty in draining accumulated water, and backflow water interfering with the stable application of negative pressure, significantly extending the service life of the equipment and ensuring the continuity and stability of the negative pressure testing process.

[0015] The accompanying water storage indicator, through a hollow liquid level float that rises and falls synchronously with the return water volume, allows for a quick and intuitive rough assessment of the steel drum's deformation degree via the height difference between the upper baffle ring and the positioning ring. Furthermore, the scale lines on the outer wall of the float provide precise readings of the return water volume and quantify the steel drum's deformation, enabling real-time monitoring of the steel drum's deformation state throughout the negative pressure test. Compared to traditional immersion leak tests and negative pressure tests without monitoring, this significantly improves the accuracy, traceability, and ease of operation of the test.

[0016] By linking the level float, the upper baffle ring, and the blocking component, a purely mechanically triggered overpressure protection mechanism was designed: when the deformation of the steel drum reaches the preset limit and the return water level rises to the threshold, the buoyancy of the level float drives the upper baffle ring to push the feedback slide to move, thereby driving the sliding baffle to automatically block the negative pressure flow channel. The negative pressure application can be cut off instantly without manual intervention and without relying on electronic control and sensors.

[0017] The bottom of the water storage tank is equipped with a drain outlet with a switch valve. After a single batch of tests is completed, the water in the tank can be quickly drained without disassembling the equipment. The operation is convenient and efficient, perfectly meeting the needs of large-scale and continuous testing for the factory inspection of steel drum production lines. At the same time, the whole device adopts a modular splicing structure, and the water storage components and blocking components can be disassembled and installed independently. Daily maintenance and replacement of vulnerable parts are simple and convenient, greatly reducing equipment operation and maintenance costs and downtime.

[0018] The design of the negative pressure buffer tank, combined with the water storage component, effectively suppresses negative pressure fluctuations, ensuring stable and controllable negative pressure inside the tank during testing. This fully complies with the standard testing requirements for factory inspection, type testing, and in-use re-inspection in the steel drum industry. The stable negative pressure environment and precise deformation monitoring can more sensitively detect hidden problems such as micro-defects in steel drum welds, poor sealing, and weak materials. This significantly improves the accuracy of testing the sealing performance and structural reliability of steel drums, controlling leakage and safety accident risks in the storage and transportation of steel drums from the source, and ensuring logistics compliance and production safety.

[0019] The core blocking protection and liquid level monitoring adopt a purely mechanical structure without complex electronic components. Even in the humid, dusty, and corrosive environments of industrial workshops such as chemical and coating plants, it can still maintain extremely high operational stability and anti-interference ability. It has a low failure rate and long service life, and can be adapted to the needs of all scenarios from laboratory type testing to online full inspection of production lines. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the other side of a steel barrel negative pressure testing device; Figure 3 A schematic diagram of the water storage component of a steel barrel negative pressure testing device; Figure 4 This is a schematic diagram of the disassembled structure of the water storage component of a steel barrel negative pressure testing device; Figure 5 This is a schematic diagram of a partial cross-sectional structure of the water storage component of a steel barrel negative pressure testing device; Figure 6 A negative pressure testing device for steel drums Figure 5 Enlarged structural diagram at point A in the middle; Figure 7 This is a cross-sectional schematic diagram of the connection end of a steel barrel negative pressure testing device.

[0021] In the diagram: 1. Mounting base; 11. Control device; 12. Negative pressure generator; 13. Negative pressure buffer tank; 131. Connecting end; 14. Negative pressure connecting pipe; 2. Water storage component; 21. Cover; 22. Side connection end; 221. Mounting hole; 222. Connection hole; 23. Cover; 24. Water storage tank; 25. Drain pipe; 3. Support arm; 31. Positioning ring; 32. Liquid level float; 33. Upper baffle ring; 4. Feedback slide; 41. Slide groove one; 42. Spring; 43. Sliding arm; 44. Sliding baffle; 45. Guide roller; 46. Slide groove two; 47. Slot; 5. External pipe end. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0024] Please see Figures 1-7 This invention provides a technical solution for a steel drum negative pressure testing device: Example 1: A negative pressure testing device for a steel drum includes a mounting base 1. A control device 11 is installed on one side of the top of the mounting base 1, and a negative pressure transmitter 12 is installed on the other side of the top of the mounting base 1. A negative pressure buffer tank 13 is installed at the top of the mounting base 1 and behind the control device 11. The output end of the negative pressure transmitter 12 is connected to the top of the negative pressure buffer tank 13 through a negative pressure connecting pipe 14. A connecting end 131 is installed on the upper end of one side of the outer wall of the negative pressure buffer tank 13. A water storage component 2 is installed at one end of the connecting end 131, and an external pipe end 5 is installed on the other side of the water storage component 2. The water storage component 2 includes a cover 23, a cap 21 connected to the top of the cover 23, side connection ends 22 symmetrically installed on the outer wall of the cap 21, a water storage tank 24 installed on the inner side of the cover 23, a drain pipe 25 connected to the lower end of the water storage tank 24, and a water storage indicator component provided on the upper inner wall of the water storage tank 24. The water storage indicator component includes support arms 3 that are equidistantly distributed in a ring on the upper part of the inner wall of the water storage tank 24. One end of the multiple support arms 3 is fixed with a positioning ring 31. A liquid level float 32 is slidably arranged on the inner side of the positioning ring 31. An upper baffle ring 33 is installed on the upper part of the outer wall of the liquid level float 32. A blocking component that works in conjunction with the upper retaining ring 33 is installed on the inner side of the side connection end 22; The negative pressure generator 12 is used to generate negative pressure. The upper end of the external pipe end 5 is connected to the oil drum to be tested through a test pipe. These are all common technologies in the field and will not be described in detail in this application. The water storage tank 24 is made of transparent material to facilitate observation of the internal condition of the water storage tank 24. The internal structure of the liquid level float 32 is hollow to generate greater buoyancy. The outer diameter of the upper baffle ring 33 is larger than the inner diameter of the positioning ring 31 to prevent the liquid level float 32 from falling excessively in the absence of water. The outer wall of the liquid level float 32 is provided with scale lines to read the amount of water returning due to the deformation of the steel drum, thereby determining the degree of deformation of the steel drum. Secondly, the degree of deformation of the steel drum can also be quickly and roughly understood by observing the height difference between the upper baffle ring 33 and the positioning ring 31. The outer wall of the drain pipe 25 is provided with a switch valve to quickly drain the water in the water storage tank 24 after the test is completed.

[0025] In the second embodiment, a mounting hole 221 is provided on the outer side of the side connecting end 22, and a connecting hole 222 is provided on the inner side of the side connecting end 22. The mounting hole 221 and the connecting hole 222 are connected, and the inner diameter of the connecting hole 222 is smaller than the inner diameter of the mounting hole 221.

[0026] In embodiment three, the blocking component includes a feedback slide 4 slidably disposed above the inner side of the side connection end 22. A first groove 41 is formed on the inner side of the side connection end 22 corresponding to the feedback slide 4. A spring 42 is installed at one end of the first groove 41. A sliding arm 43 is slidably mounted on the inner side of the feedback slide 4. Guide rollers 45 are rotatably mounted on both sides of the upper end of the sliding arm 43. A sliding baffle 44 is connected to the lower end of the sliding arm 43. A second groove 46 is formed on the inner side of the feedback slide 4 corresponding to the guide rollers 45. The lower part of the first groove 41 corresponds to the sliding baffle 44. A slot 47 is provided at the connection hole 222. The size of the sliding baffle 44 is adapted to the connection hole 222, which facilitates the subsequent blocking of negative pressure through the sliding baffle 44. The second slide 46 is set to be inclined outward. One end of the feedback slide 4 has an inward inclined surface. The outer diameter of the upper baffle ring 33 is smaller than the inner diameter of the cover 21. The upper baffle ring 33 is positioned in relation to the inclined surface. By utilizing the cooperation of the outward and inward inclined surfaces of the second slide 46, after the steel barrel is deformed to a certain extent, the buoyancy of the deformed backflow water is used to seal the negative pressure flow channel, causing severe deformation of the steel barrel.

[0027] In practical use, this invention serves as a negative pressure testing device for steel drums. First, the steel drum to be tested is filled with water. The drum opening is connected to the external pipe end 5 via a negative pressure suction pipe. The negative pressure generator 12 is controlled by the control device 11 to draw negative pressure. Through the cooperation of the negative pressure connecting pipe 14, the negative pressure buffer tank 13, the water storage component 2, and the external pipe end 5, negative pressure is drawn onto the steel drum. As the negative pressure increases, the steel drum deforms. This deformation forces some water out of the drum. The squeezed water flows back into the water storage tank 24 via the negative pressure suction pipe and the external pipe end 5. The backflow of the squeezed water raises the level float 32. When the water level is low, the deformation of the steel drum can be quickly and intuitively assessed by the drop between the upper baffle ring 33 and the positioning ring 31. Simultaneously, the water in the storage tank 24 prevents continuous negative pressure. As the negative pressure continues, the steel drum will deform further, and the water volume will increase accordingly, causing the level float 32 to rise further. At this time, the water volume can be accurately read through the scale on the outer wall of the level float 32 to determine the final deformation. Furthermore, as the level float 32 rises further, the buoyancy of the rise causes the upper baffle ring 33 to exert a thrust on the inwardly inclined surface of the feedback slide 4, pushing the feedback slide 4 to slide inward into the first chute 41 and compressing the spring 42. As the feedback slide 4 slides inward, the outwardly inclined second chute 46 pushes the guide roller 45, which in turn pushes the sliding arm 43 and the sliding baffle 44 downward. When the water level rises further to its limit, the second chute 46 also pushes the sliding baffle 44 to move completely downward, thus sealing the connection hole 222 and preventing damage. The steel drum undergoes further deformation. Then, the negative pressure generator 12 stops working, the switch valve is opened, and the water in the water storage tank 24 is quickly discharged to facilitate subsequent testing of other steel drums. As the water in the water storage tank 24 is discharged, the liquid level float 32 will also fall. As the liquid level float 32 falls, the thrust of the upper baffle ring 33 on the inclined surface will also disappear. Then, during the reset process, the spring 42 will push the feedback slide 4 to slide outward, thereby using the second slide groove 46 to lift the sliding arm 43 and the sliding baffle 44 upward, thereby opening the seal at the connection hole 222.

[0028] The above are merely specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent substitutions, or modifications made based on the present invention to solve essentially the same technical problems and achieve essentially the same technical effects are all covered within the protection scope of the present invention.

Claims

1. A negative pressure testing device for a steel drum, comprising a mounting base (1), wherein a control device (11) is mounted on one side of the top of the mounting base (1), a negative pressure transmitter (12) is mounted on the other side of the top of the mounting base (1), and a negative pressure buffer tank (13) is mounted on the top of the mounting base (1) and behind the control device (11), wherein the output end of the negative pressure transmitter (12) is connected to the top of the negative pressure buffer tank (13) via a negative pressure connecting pipe (14), characterized in that: The upper end of one side of the outer wall of the negative pressure buffer tank (13) is connected to a connecting end (131), a water storage component (2) is installed at one end of the connecting end (131), and an external pipe end (5) is installed on the other side of the water storage component (2). The water storage component (2) includes a cover (23), a cap (21) is connected to the top of the cover (23), side connection ends (22) are symmetrically installed on the outer wall of the cap (21), a water storage tank (24) is installed on the inner side of the cover (23), a drain pipe (25) is connected to the lower end of the water storage tank (24), and a water storage indicator component is provided on the upper part of the inner wall of the water storage tank (24). The water storage indicator component includes support arms (3) that are equidistantly distributed in a ring above the inner wall of the water storage tank (24). One end of each of the support arms (3) is fixed with a positioning ring (31). A liquid level float (32) is slidably provided on the inner side of the positioning ring (31). An upper baffle ring (33) is installed on the upper side of the outer wall of the liquid level float (32). The inner side of the side connection end (22) is equipped with a blocking component that works in conjunction with the upper retaining ring (33).

2. The negative pressure testing device for a steel drum according to claim 1, characterized in that: The negative pressure generator (12) is used to generate negative pressure, and the upper end of the external pipe end (5) is connected to the oil drum to be tested through a test pipe.

3. The negative pressure testing device for a steel drum according to claim 1, characterized in that: The liquid level float (32) has a hollow structure inside to generate greater buoyancy, and the outer diameter of the upper baffle ring (33) is larger than the inner diameter of the positioning ring (31).

4. The negative pressure testing device for a steel drum according to claim 1, characterized in that: A switch valve is provided on the outer wall of the drain pipe (25).

5. The negative pressure testing device for a steel drum according to claim 1, characterized in that: The side connection end (22) has an installation hole (221) on its outer side and a connection hole (222) on its inner side. The installation hole (221) and the connection hole (222) are connected. The inner diameter of the connection hole (222) is smaller than the inner diameter of the installation hole (221).

6. The negative pressure testing device for a steel drum according to claim 1, characterized in that: The blocking component includes a feedback slide (4) slidably disposed above the inner side of the side connection end (22). A slide groove (41) is provided on the inner side of the side connection end (22) and at the location corresponding to the feedback slide (4). A spring (42) is installed at one end of the inner side of the slide groove (41). A sliding arm (43) is slidably mounted on the inner side of the feedback slide (4). Guide rollers (45) are rotatably mounted on both sides of the upper end of the sliding arm (43). A sliding baffle (44) is connected to the lower end of the sliding arm (43).

7. The negative pressure testing device for a steel drum according to claim 6, characterized in that: The inner side of the feedback slide (4) and the corresponding position of the guide roller (45) are provided with a second slide groove (46), and the lower part of the inner side of the first slide groove (41) and the corresponding position of the sliding baffle (44) are provided with a slot (47), which extends to the connection hole (222).

8. The negative pressure testing device for a steel drum according to claim 7, characterized in that: The second slide (46) is inclined outward, and one end of the feedback slide (4) is provided with an inward inclined slope. The outer diameter of the upper retaining ring (33) is smaller than the inner diameter of the cover (21), and the position of the upper retaining ring (33) corresponds to the slope.

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