A metal bellows bending anti-leakage test device

Abstract

This utility model relates to the field of corrugated pipe testing technology, and discloses a metal corrugated pipe bending anti-leakage test device. The device includes: a housing, with a pair of bases fixed to the bottom of the housing; a pair of linear reciprocating slide rails installed inside the housing; and a slider fixed to the top of each linear reciprocating slide rail, the slider being slidably connected to the housing via a transverse groove. This metal corrugated pipe bending anti-leakage test device, through the cooperation of the housing, bases, linear reciprocating slide rails, sliders, circular plates, supports, horizontal pipes, pipe valves, joints, pressure gauges, metal corrugated pipes, and sealing mechanisms, drives the linear reciprocating slide rails to bring the two sliders closer together, placing the metal corrugated pipe in a bent state. The entire device remains stationary for a certain period, and subsequent observation of the pressure gauge for pressure drop allows for the determination of the sealing performance of the metal corrugated pipe in the bent state, making the test results more rigorous.

Description

Technical Field

[0001] This utility model relates to the field of corrugated pipe testing technology, specifically a metal corrugated pipe bending and leakage resistance testing device. Background Technology

[0002] Metal corrugated pipes are flexible tubular components made of thin metal sheets processed into a corrugated shape using special techniques. Their core structure consists of a series of annular or spiral corrugations, a design that gives the pipe excellent flexibility and compensation capabilities. They are typically made of corrosion-resistant, high-strength metal materials such as stainless steel, carbon steel, or alloy steel. They can withstand the pressure of the internal medium and effectively absorb displacement caused by thermal expansion and contraction, mechanical vibration, or foundation settlement through the elastic deformation of the corrugations, thus preventing damage to the pipeline system due to stress concentration. With their reliable sealing, high pressure resistance, wide temperature range (from -200℃ to 600℃), and strong fatigue resistance, metal corrugated pipes are widely used in pipeline connections, equipment vibration damping, and compensation devices in petrochemical, power, shipbuilding, and aerospace industries, becoming a key component for ensuring the safe and stable operation of industrial systems.

[0003] During factory use, metal corrugated pipes need to undergo bending and leakage resistance testing. Only those that meet the requirements can be shipped and sold. In the existing technology, a utility model patent with the authorized public account CN219104277U discloses a metal corrugated pipe bending and leakage resistance testing device. This device includes a horizontally arranged base plate and two vertically arranged first and second moving plates. The bottom ends of the first and second moving plates are slidably connected to the base plate and connected to a drive assembly. While this device can perform bending and leakage resistance testing on metal corrugated pipes, it still has some minor drawbacks in actual use. For example, the sealing plug structure at the end of the corrugated pipe may fail to seal properly if the cut surface at the pipe end is not neat enough, affecting the smooth progress of the testing. Furthermore, the inability to pressurize the inside of the corrugated pipe during testing results in less rigorous test results. Utility Model Content

[0004] The purpose of this invention is to provide a metal corrugated pipe bending and leakage resistance testing device, which can seal and block the irregular cut of the metal corrugated pipe port, and pressurize the inside of the metal corrugated pipe during the test, so as to make the test results more rigorous, thereby solving the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a metal corrugated pipe bending anti-leakage test device, comprising: a box body, a pair of bases fixedly connected to the bottom end of the box body, a pair of linear reciprocating slide rails installed inside the box body, a slider fixedly connected to the top end of the linear reciprocating slide rails, the slider being slidably connected to the box body through a transverse groove, a circular plate provided at the top end of the slider, the circular plate being connected to the slider through a bracket, a horizontal pipe fixedly connected to the inner wall of the circular plate, a pipe valve fixedly connected to the left end of the left horizontal pipe, a connector fixedly connected to the right end of the right horizontal pipe, a pressure gauge installed on the front side of the outer wall of the right horizontal pipe, and a metal corrugated pipe provided between the two circular plates, the corrugated pipe being connected to the circular plates through a sealing mechanism.

[0006] Preferably, the sealing mechanism includes: a pair of hollow bladders, the pair of hollow bladders being located on both sides of the inner wall of the metal bellows, the inner wall of the hollow bladders being provided with a hollow ring, the hollow bladders being connected to the hollow rings via pipe clamps, the outer wall of the hollow rings being provided with a pair of through holes, a pair of inserts being fixedly connected to the inside of the circular plate, the inserts being fixedly connected to the hollow rings, a solenoid valve being installed at the end of the inserts away from the hollow rings, and an injection pipe being installed at the injection port of the solenoid valve at the bottom end.

[0007] Preferably, both ends of the metal corrugated pipe are provided with auxiliary mechanisms, the auxiliary mechanisms including: a pair of collars, the pair of collars being fixedly sleeved on the outer wall of a pair of horizontal pipes respectively, and magnetic absorbing plates being fixedly attached to the surface of the metal corrugated pipe near the collars, the magnetic absorbing plates being attracted to the metal corrugated pipe.

[0008] Compared with the prior art, the beneficial effects of this utility model are as follows: This metal corrugated pipe bending anti-leakage testing device has the following advantages over traditional technology:

[0009] Through the coordination of the housing, base, linear reciprocating slide rail, slider, circular plate, bracket, horizontal pipe, pipeline valve, connector, pressure gauge, metal bellows, and sealing mechanism, the inspector first places the two ends of the metal bellows onto the outside of the two hollow bladders, then activates the bottom solenoid valve to increase the air pressure and expand the volume inside the hollow bladders, thus pressing them tightly against the inner wall of the metal bellows and completing the sealing operation. This operation is simple and efficient, and can seal and plug metal bellows ends with uneven cuts. Afterwards, it is connected to an external air supply pipeline through the connector, and air is supplied to the metal bellows through the right horizontal pipe. Pressurized air is injected into the bellows. During this process, the inspector can observe the pointer of the pressure gauge installed on the outer wall of the right horizontal pipe to determine the injection pressure value. This allows for pressurization of the inside of the metal bellows during the test. Once the pressure reaches the predetermined value, the air injection and pressurization operation is stopped, and the valve on the external air supply pipeline is closed. Finally, the linear reciprocating slide rail is driven to bring the two sliders closer together, placing the metal bellows in a bent state. The entire structure of the device remains stationary for a certain period of time. Subsequent observation of the pressure gauge to see if there is a pressure drop allows for the determination of the sealing performance of the metal bellows in the bent state, making the test results more rigorous.

[0010] Through the cooperation of the housing, base, linear reciprocating slide rail, slider, circular plate, bracket, horizontal tube, pipeline valve, joint, pressure gauge, metal bellows, sealing mechanism and auxiliary mechanism, when the metal bellows is fitted onto the outside of the cavity bladder, the inspector can attach the end of the metal bellows to the magnetic absorbing plate. The magnetic absorbing plate can generate a suction force on the end of the metal bellows, providing a certain limiting effect for the metal bellows, which facilitates the stable expansion and tightening of the inner wall of the metal bellows during the subsequent expansion of the cavity bladder. Attached Figure Description

[0011] The above and other features, advantages, and aspects of the embodiments of this disclosure will become more apparent from the accompanying drawings and the following detailed description. Throughout the drawings, the same or similar reference numerals denote the same or similar elements. It should be understood that the drawings are schematic, and the originals and elements are not necessarily drawn to scale.

[0012] Figure 1 This is a schematic diagram of the structure of this utility model;

[0013] Figure 2 for Figure 1 Schematic diagram of the connection structure of the box body, horizontal pipe and metal corrugated pipe;

[0014] Figure 3 for Figure 2 Enlarged view of point A in the middle.

[0015] In the diagram: 1. Box body, 2. Base, 3. Linear reciprocating slide rail, 4. Slider, 5. Circular plate, 6. Bracket, 7. Horizontal tube, 8. Pipe valve, 9. Connector, 10. Pressure gauge, 11. Metal bellows, 12. Hollow bladder, 13. Hollow ring, 14. Pipe clamp, 15. Through hole, 16. Insert tube, 17. Solenoid valve, 18. Air injection pipe, 19. Collar, 20. Magnetic suction plate. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] Please see Figures 1-3 This utility model provides a technical solution: a metal corrugated pipe bending anti-leakage test device, comprising: a box body 1, a pair of bases 2 fixedly connected to the bottom end of the box body 1, a pair of linear reciprocating slide rails 3 installed inside the box body 1, a slider 4 fixedly connected to the top end of the linear reciprocating slide rails 3, the slider 4 being slidably connected to the box body 1 through a transverse groove, a circular plate 5 provided at the top end of the slider 4, the circular plate 5 being connected to the slider 4 through a bracket 6, a horizontal pipe 7 fixedly connected to the inner wall of the circular plate 5, a pipe valve 8 fixedly connected to the left end of the left horizontal pipe 7, a connector 9 fixedly connected to the right end of the right horizontal pipe 7, a pressure gauge 10 installed on the front side of the outer wall of the right horizontal pipe 7, and a metal corrugated pipe 11 provided between the two circular plates 5, the corrugated pipe 11 being connected to the circular plates 5 through a sealing mechanism.

[0018] In the specific implementation process, it is worth noting that the housing 1 is made of high-strength metal material, such as stainless steel, which has good rigidity and stability and can withstand various stresses generated during the test, ensuring that the entire device will not deform or be damaged during long-term use, thus guaranteeing the accuracy of the test results. The linear reciprocating slide rail 3 is composed of linear guide rails, transmission components, drive devices, and support structure components, and is a common transmission structure component. The linear slide rail module 3 can be combined with photoelectric sensors and encoders to detect the position and speed of the motor rotor in real time and feed the information back to the servo driver, thereby achieving precise control of position, speed, and acceleration. When the linear slide rail module 3 is running, the slider 4 in its transmission component can perform precise linear motion. The bracket 6 has high strength and stability and can effectively transmit the force borne by the circular plate 5 to the slider 4. The horizontal tube 7 is made of seamless steel pipe and has good pressure resistance, which can withstand the high-pressure air injected during the test without cracking or leaking. The connector 9 can be connected and disconnected from the external air supply pipeline. The pressure gauge 10 can accurately display the pressure value inside the metal bellows 11 in real time, providing reliable test data for the testing personnel.

[0019] Furthermore, the sealing mechanism includes: a pair of hollow bladders 12, which are located on both sides of the inner wall of the metal bellows 11. The inner wall of the hollow bladder 12 is provided with a hollow ring 13. The hollow bladder 12 is connected to the hollow ring 13 through a pipe clamp 14. The outer wall of the hollow ring 13 is provided with a pair of through holes 15. A pair of insertion tubes 16 are fixedly connected to the inside of the circular plate 5. The insertion tubes 16 are fixedly connected to the hollow ring 13. A solenoid valve 17 is installed at the end of the insertion tube 16 away from the hollow ring 13. An air injection pipe 18 is installed at the air injection port of the bottom solenoid valve 17.

[0020] In the specific implementation process, it is worth noting that the cavity bladder 12 is made of a highly elastic and wear-resistant rubber material, such as nitrile rubber, which has good flexibility and sealing performance. It can expand under the action of high-pressure air and fit tightly against the inner wall of the metal bellows 11, effectively sealing the port of the metal bellows 11. At the same time, this rubber material also has a certain degree of chemical corrosion resistance, which can adapt to the test requirements of different media environments. The cavity ring 13 is made of metal material, such as aluminum alloy, which has high strength and rigidity and can withstand the impact of high-pressure air without deformation, ensuring the stability of the cavity bladder 12 during the expansion process. The pipe clamp 14 is made of stainless steel, which has good corrosion resistance and strength. The through-hole 15 is designed to securely connect the cavity bladder 12 and the cavity ring 13, preventing loosening or detachment during testing. The diameter of the through-hole 15 is precisely calculated and designed to ensure that high-pressure air can enter the cavity bladder 12 quickly and evenly, while preventing damage to the cavity bladder 12 due to excessive local pressure during expansion. The solenoid valve 17 is a normally closed solenoid valve with opposite inlet and outlet positions on both sides, enabling accurate control of air flow in a short time to regulate the internal air pressure of the cavity bladder 12. The air injection pipe 18 is made of high-pressure rubber tubing, which has good flexibility and pressure resistance, allowing for easy connection to an external air source and providing a stable air supply for the expansion of the cavity bladder 12.

[0021] Furthermore, both ends of the metal corrugated pipe 11 are provided with auxiliary mechanisms, which include: a pair of collars 19, which are fixedly sleeved on the outer walls of a pair of horizontal pipes 7 respectively. Magnetic plates 20 are fixedly attached to the surface of the metal corrugated pipe 11 near the collars 19, and the magnetic plates 20 are attracted to the metal corrugated pipe 11.

[0022] In the specific implementation process, it is worth noting that the collar 19 is made of metal, such as stainless steel, which has high strength and rigidity and can be firmly fixed on the horizontal tube 7, providing stable support for the magnetic plate 20. The magnetic plate 20 is made of strong magnetic material, such as neodymium iron boron magnet, which has attraction force and can quickly and firmly attract the end of the metal bellows 11 to the collar 19, providing a reliable limiting effect for the metal bellows 11. The surface of the magnetic plate 20 is coated, such as nickel plating or zinc plating, which can improve its corrosion resistance and wear resistance and extend its service life. At the same time, the shape and size of the magnetic plate 20 are designed according to the shape and size of the end of the metal bellows 11 to ensure that it can achieve good attraction with the metal bellows 11 and improve the limiting effect.

[0023] Working principle:

[0024] Metal bellows installation and limiting:

[0025] The testing personnel placed the metal bellows 11 to be tested in a suitable position on the testing device, and fitted the two ends of the metal bellows 11 onto the outside of the two hollow bladders 12 respectively. During this process, the auxiliary mechanism was used for limiting operation. The testing personnel attached the end of the metal bellows 11 to the magnetic absorbing plate 20. The magnetic absorbing plate 20 generated a suction force, which provided a certain limiting effect for the metal bellows 11, ensuring that the position of the metal bellows 11 was stable in subsequent operations, so that the hollow bladders 12 could accurately and stably expand and press against the inner wall of the metal bellows 11 when it expanded later.

[0026] Metal bellows port sealing:

[0027] After the installation and positioning of the metal bellows 11 are completed, the bottom solenoid valve 17 is activated. At this time, the air injection pipe 18 injects high-pressure air into the cavity ring 13 through the bottom solenoid valve 17 and the bottom insertion pipe 16. After the high-pressure air enters the cavity ring 13, it enters the cavity bladder 12 through the through hole 15. As the high-pressure air is continuously injected, the air pressure inside the cavity bladder 12 gradually increases, causing the cavity bladder 12 to expand. The expanded cavity bladder 12 tightly abuts against the inner wall of the metal bellows 11, thereby completing the sealing operation of the two ports of the metal bellows 11. This sealing method is simple and efficient to operate, and can effectively seal and block the irregular ports of the metal bellows 11, ensuring that a relatively closed space is formed inside the metal bellows 11 during subsequent testing.

[0028] Internal pressurization of the metal bellows:

[0029] After sealing the port, connect the device to the external air supply pipeline via connector 9, open the relevant pipeline valve 8, and inject pressurized air into the interior of the metal bellows 11 through the right horizontal pipe 7. During the air injection process, the inspector closely observes the pointer of the pressure gauge 10 installed on the outer wall of the right horizontal pipe 7. The pressure gauge 10 displays the pressure value inside the metal bellows 11 in real time. Based on the indication of the pressure gauge 10 pointer, the inspector judges whether the injected pressure has reached the predetermined value, thereby achieving precise control of the pressurization operation inside the metal bellows 11 during the inspection.

[0030] Metal bellows bending state settings:

[0031] Once the internal pressure of the metal bellows 11 reaches the predetermined value, the gas injection and pressurization operation is stopped, and the valve on the external gas supply pipeline is immediately closed to ensure that the internal pressure of the metal bellows 11 is stable at the predetermined value. Subsequently, the linear reciprocating slide rail 3 is driven to bring the two sliders 4 mounted on the linear reciprocating slide rail 3 closer to each other. Since the sliders 4 are connected to the metal bellows 11 through components such as the circular plate 5 and the bracket 6, the movement of the sliders 4 will cause the metal bellows 11 to bend and deform, placing the metal bellows 11 in a bent state to simulate the bending conditions that the metal bellows 11 may encounter in actual use.

[0032] Sealing performance testing and result interpretation:

[0033] After placing the metal bellows 11 in a bent state and keeping the entire structure stationary for a certain period of time, the inspector continuously observes the pointer of the pressure gauge 10. If the pointer of the pressure gauge 10 remains stable without any pressure drop, it indicates that the metal bellows 11 has good sealing performance in the bent state and there is no leakage. Conversely, if the pointer of the pressure gauge 10 drops significantly, indicating a pressure drop, it indicates that the metal bellows 11 has leakage problems in the bent state and poor sealing performance. In this way, the sealing performance of the metal bellows 11 in the bent state can be accurately judged, making the test results more rigorous and reliable, and providing an important basis for the quality assessment and practical application of the metal bellows 11.

[0034] Subsequent disassembly procedures for the metal bellows:

[0035] After the metal bellows 11 is inspected, the pipe valve 8 is opened to release the air inside the metal bellows 11, and the upper solenoid valve 17 is opened to release the air inside the cavity bladder 12. The metal bellows 11 can then be disassembled for future use.

[0036] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A metal bellows bend leak resistance test apparatus comprising: The box body (1) is characterized in that: a pair of bases (2) are fixedly connected to the bottom end of the box body (1), a pair of linear reciprocating slide rails (3) are installed inside the box body (1), a slider (4) is fixedly connected to the top end of the linear reciprocating slide rails (3), the slider (4) is slidably connected to the box body (1) through a transverse groove, a circular plate (5) is provided at the top end of the slider (4), the circular plate (5) is connected to the slider (4) through a bracket (6), a horizontal tube (7) is fixedly connected to the inner wall of the circular plate (5), a pipe valve (8) is fixedly connected to the left end of the left horizontal tube (7), a connector (9) is fixedly connected to the right end of the right horizontal tube (7), a pressure gauge (10) is installed on the front side of the outer wall of the right horizontal tube (7), and a metal corrugated pipe (11) is provided between the two circular plates (5), the corrugated pipe (11) is connected to the circular plate (5) through a sealing mechanism.

2. The metal corrugated pipe bending anti-leakage test device according to claim 1, characterized in that: The sealing mechanism includes: a pair of hollow bladders (12), the pair of hollow bladders (12) are respectively located on both sides of the inner wall of the metal bellows (11), the inner wall of the hollow bladder (12) is provided with a hollow ring (13), the hollow bladder (12) is connected to the hollow ring (13) through a pipe clamp (14), the outer wall of the hollow ring (13) is provided with a pair of through holes (15), a pair of insertion tubes (16) are fixedly connected inside the circular plate (5), the insertion tubes (16) are fixedly connected to the hollow ring (13), the end of the insertion tube (16) away from the hollow ring (13) is equipped with a solenoid valve (17), and the air injection port of the bottom solenoid valve (17) is equipped with an air injection pipe (18).

3. The metal corrugated pipe bending leakage test device according to claim 1, characterized in that: Both ends of the metal corrugated pipe (11) are provided with auxiliary mechanisms, the auxiliary mechanisms including: a pair of collars (19), the pair of collars (19) are respectively fixedly sleeved on the outer wall of a pair of horizontal pipes (7), the collars (19) are fixedly attached to the surface of the metal corrugated pipe (11) with magnetic absorbing plates (20), the magnetic absorbing plates (20) are attracted to the metal corrugated pipe (11).

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