Airtightness testing device for corrugated expansion joint
By using a worm gear lifting mechanism and a cylinder-driven corrugated expansion joint air tightness testing device, the problems of misjudgment caused by uneven sealing of the bellows end face and cumbersome multi-specification testing have been solved, achieving efficient and accurate air tightness testing.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ANSHAN HUAXIN HEAVYINDUSTRY MASCH CO LTD
- Filing Date
- 2025-09-09
- Publication Date
- 2026-06-26
Smart Images
Figure CN224416378U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of corrugated pipe air tightness testing technology, specifically relating to a corrugated expansion joint air tightness testing device. Background Technology
[0002] A corrugated expansion joint is a pipeline compensation device with a corrugated pipe as its core component. It achieves displacement compensation through elastic deformation and is used to absorb displacement caused by thermal expansion and contraction of pipelines and installation deviations. One of its core performance requirements is airtightness, that is, ensuring no gas leakage under working pressure. For corrugated pipes made of metal materials such as stainless steel, their own structure is relatively rigid, but airtightness testing still faces serious challenges. These challenges mainly come from the sealing of their end faces rather than the pipe body itself.
[0003] Patent application number 202321652331.4 proposes a steel pipe airtightness testing device. The device uses an electric push rod to drive a conical sealing plug to move down and seal the top of the steel pipe. The sealing effect is good and the force is more even, avoiding the problem of the steel pipe shaking up and down due to uneven force, which reduces the testing accuracy. The device also uses two sets of straightening mechanisms to clamp the steel pipe from both sides and guide it, which further improves the stability of the steel pipe, avoids lateral shaking of the steel pipe, and improves the testing accuracy.
[0004] However, in existing technologies, the end face of the bellows is uneven. During sealing, gaps can easily appear between the bellows and the sealing element, causing gas to leak out from the gaps when testing for air tightness. This can lead to misjudgment of qualified bellows. Furthermore, existing testing equipment mostly uses single-size or special tooling interfaces, which limits the range of pipe diameters that can be used. When testing bellows of different specifications, it is necessary to frequently change multiple compatible sealing elements, making the operation cumbersome.
[0005] Therefore, there is an urgent need for an airtightness testing device that can reduce misjudgments and be compatible with the testing of bellows of various specifications. Utility Model Content
[0006] Based on the above-mentioned technical problems, the purpose of this utility model is to provide a corrugated expansion joint air tightness test device. This device achieves uniform pressure on the end face of the corrugated pipe through the coordinated drive of the worm gear lifting mechanism and the cylinder. Combined with the adaptation design of multi-size detection interfaces and sealing gaskets, it effectively solves the problem of misjudgment caused by uneven sealing in the prior art and the problem of cumbersome tooling change when testing corrugated pipes of multiple specifications.
[0007] The specific technical solution is as follows:
[0008] A corrugated expansion joint airtightness testing device includes: a frame, a worm gear lifting mechanism, a movable crossbeam, a pressure mechanism, an upper detection interface, a lower detection interface, sealing gaskets, a connection port, and a pressure supply mechanism; the worm gear lifting mechanism is mounted on the frame, and its moving end is connected to the movable crossbeam; the pressure mechanism includes a cylinder, an upper pressure cover, and a lower pressure seat, the cylinder is fixed on the movable crossbeam, the telescopic end of the cylinder is connected to the upper pressure cover, and the lower pressure seat is located at the bottom of the frame; the upper pressure cover and the lower pressure seat are respectively provided with multiple upper and lower detection interfaces of different sizes, a bellows is installed at the upper and lower detection interfaces, and sealing gaskets are provided between the bellows and the upper and lower detection interfaces; the connection port is located on the upper pressure cover; the pressure supply mechanism is located on one side of the frame, and its output end is connected to the cylinder and the connection port respectively.
[0009] In addition, the corrugated expansion joint air tightness testing device provided by this utility model may also have the following additional technical features:
[0010] In the above technical solution, the worm gear lifting mechanism includes: two motors, two gearboxes, four connecting rods, and four worm gear lifters; the motors, gearboxes, and worm gear lifters are all fixed on the frame, the input end of the gearbox is connected to the output shaft of the motor, the output end of each gearbox is connected to one end of the two connecting rods, and the other end of the four connecting rods is connected to the input end of the four worm gear lifters.
[0011] In the above technical solution, the outer ring of the ball bearing is fixed on the movable crossbeam, and the screw of the worm gear jack is connected to the inner ring of the ball bearing.
[0012] In the above technical solution, the gearbox includes: a housing, a first bevel gear, a second bevel gear, a first connecting shaft, and a second connecting shaft. The first connecting shaft and the second connecting shaft are rotatably connected to the housing. The first bevel gear and the second bevel gear are respectively mounted on the first connecting shaft and the second connecting shaft, and the first bevel gear and the second bevel gear mesh and drive each other. The first connecting shaft is connected to the output shaft of the motor, and the two ends of the second connecting shaft are respectively connected to two connecting rods.
[0013] In the above technical solution, both the upper detection interface and the lower detection interface are annular grooves.
[0014] In the above technical solution, the pressure supply mechanism includes: a gas distribution tank, a main connecting pipe, a first branch connecting pipe, and a second branch connecting pipe; the gas distribution tank is located on one side of the frame, one end of the main connecting pipe is connected to the gas distribution tank, and the other end of the main connecting pipe is connected to the first branch connecting pipe and the second branch connecting pipe respectively, and the first branch connecting pipe and the second branch connecting pipe are respectively connected to the connection port and the cylinder.
[0015] In the above technical solution, there are 3 cylinders.
[0016] In the above technical solution, the upper pressure cover is provided with a first pressure gauge and a pressure sensor, both of which are connected to the bellows. The second connecting pipe is provided with a second pressure gauge and a second pressure sensor.
[0017] The corrugated expansion joint airtightness testing device of this utility model has the following advantages compared with the prior art:
[0018] 1. The movable crossbeam is driven to descend by a worm gear lifting mechanism, and the upper pressure cover is pushed down by a cylinder, so that the bellows under test is tightly fitted with the sealing gaskets of the upper pressure cover and the lower pressure seat. Uniform pressure is applied to the cross-section of the bellows to avoid uneven compression of the sealing ring due to uneven pressure, which would cause gaps at the interface. This prevents gas from leaking from the gaps during airtightness testing, thus avoiding the situation where a qualified bellows is mistakenly judged as leaking.
[0019] 2. By providing multiple detection interfaces of different sizes on the upper pressure cover and lower pressure seat, it can adapt to corrugated pipes of various diameters and specifications without the need to replace a large number of special tooling.
[0020] 3. By using the detection interface in conjunction with the sealing gasket, the risk of leakage between the bellows and the detection interface is reduced. Attached Figure Description
[0021] Figure 1 This is a front view of a corrugated expansion joint airtightness testing device according to the present invention;
[0022] Figure 2 This is a partial enlarged view of point A of this utility model;
[0023] Figure 3 This is a structural schematic diagram of the cylinder and ball bearing layout of the movable crossbeam of this utility model.
[0024] Figure 4 This is a structural diagram showing the connection relationship between the gearbox, connecting rod, and worm gear jack of this utility model;
[0025] Figure 5 This is a schematic diagram of the structure of the lower pressure seat of this utility model;
[0026] Figure 6 This is a schematic diagram of the upper pressure cover of this utility model;
[0027] Figure 7 This is a cross-sectional view of the gearbox of this utility model;
[0028] in, Figures 1 to 7The correspondence between the reference numerals and component names in the attached drawings is as follows:
[0029] 10 Frame, 11 Movable crossbeam, 12 Upper detection interface, 13 Lower detection interface, 14 Sealing gasket, 15 Connection port, 16 Cylinder, 17 Upper pressure cover, 18 Lower pressure seat, 19 Two motors, 20 Connecting rod, 21 Worm gear jack, 22 Ball bearing, 23 Housing, 24 First bevel gear, 25 Second bevel gear, 26 First connecting shaft, 27 Second connecting shaft, 28 Gas distribution tank, 29 Main connecting pipe, 30 First branch connecting pipe, 31 Second branch connecting pipe, 32 First pressure gauge, 33 Bellows, 34 Second pressure gauge. Detailed Implementation
[0030] The following are specific implementation cases and appendices. Figure 1-7 The present invention will be further described below, but the present invention is not limited to these embodiments.
[0031] A corrugated expansion joint air tightness test device, such as Figure 1-7 The system includes: a frame 10, a worm gear lifting mechanism, a movable crossbeam 11, a pressure mechanism, an upper detection interface 12, a lower detection interface 13, a sealing gasket 14, a connection port 15, and a pressure supply mechanism. The worm gear lifting mechanism is mounted on the frame 10, and its moving end is connected to the movable crossbeam 11. The pressure mechanism includes a cylinder 16, an upper pressure cover 17, and a lower pressure seat 18. The cylinder 16 is fixed to the movable crossbeam 11, and its telescopic end is connected to the upper pressure cover 17. The lower pressure seat 18 is... The upper pressure cover 17 and the lower pressure seat 18 are respectively provided with multiple upper detection interfaces 12 and lower detection interfaces 13 of different sizes. The bellows 33 is installed at the upper detection interface 12 and the lower detection interface 13, and a sealing gasket 14 is provided between the bellows 33 and the upper detection interface 12 and the lower detection interface 13. The connection port 15 is provided on the upper pressure cover 17. The pressure air supply mechanism is provided on one side of the frame 10, and the output end of the pressure air supply mechanism is connected to the cylinder 16 and the connection port 15 respectively.
[0032] Using the above structure, the operator places the bellows 33 at the corresponding size of the lower detection interface 13 of the lower pressure seat 18, then activates the worm gear lifting mechanism to drive the movable crossbeam 11 to descend above the bellows 33. Then, the cylinder 16 pushes the upper pressure cover 17 down, so that the upper end of the bellows 33 to be tested is embedded in the upper detection interface 12. By applying force to the bellows 33 to be tested, both ends of the bellows 33 to be tested are tightly fitted with the sealing gaskets 14 of the upper pressure cover 17 and the lower pressure seat 18, respectively. This ensures that the pressure is evenly distributed across the entire end face of the bellows 33, avoiding uneven compression of the sealing ring due to insufficient or excessive local pressure. This eliminates non-body leakage caused by gaps at the sealing interface, thereby reducing the occurrence of qualified bellows 33 being mistakenly judged as leaking and improving the reliability of the test results.
[0033] By integrating multiple detection interfaces of different sizes on the upper pressure cover 17 and the lower pressure seat 18, it can adapt to corrugated pipes 33 of various diameters. In actual testing, operators do not need to frequently change special fixtures or tooling for corrugated pipes 33 of different specifications. They only need to select the detection interface of the corresponding size to place the corrugated pipe 33, thereby improving the versatility and testing efficiency of the equipment.
[0034] By using the detection interface in conjunction with the sealing gasket 14, the risk of leakage between the bellows 33 and the detection interface is reduced.
[0035] Specifically, the corrugated pipe 33 is a stainless steel corrugated pipe 33.
[0036] Specifically, by injecting compressed gas into the bellows 33, the purpose of conducting pressure resistance and airtightness tests on the bellows 33 can be achieved.
[0037] Specifically, the frame 10 adopts a four-column frame structure, which ensures the overall rigidity and stability.
[0038] Specifically, a pressure valve group control box and a power distribution box are also provided on one side of the frame 10. The pressure valve group control box integrates components such as pressure regulating valve, safety valve, and pressure sensor to control the pressure injected into the bellows 33; the power distribution box provides power to the equipment.
[0039] In an embodiment of this utility model, the worm gear lifting mechanism includes: two motors 19, two gearboxes, four connecting rods 20, and four worm gear lifters 21; the motors, gearboxes, and worm gear lifters 21 are all fixed on the frame 10, the input end of the gearbox is connected to the output shaft of the motor, the output end of each gearbox is connected to one end of the two connecting rods 20, and the other end of the four connecting rods 20 is connected to the input end of the four worm gear lifters 21.
[0040] Two motors 19 operate synchronously and transmit force to four connecting rods 20 simultaneously through gearboxes, causing the four connecting rods 20 to rotate simultaneously. This drives four worm gear lifts 21 to operate synchronously, controlling the lifting and lowering of the movable crossbeam 11, thereby adjusting the distance between the movable crossbeam 11 and the components located on the movable crossbeam 11 and the bellows 33 to be tested.
[0041] In an embodiment of this utility model, the outer ring of the ball bearing 22 is fixed on the movable crossbeam 11, and the screw of the worm gear jack 21 is connected to the inner ring of the ball bearing 22.
[0042] By fixing the outer ring of the ball bearing 22 to the movable crossbeam 11, the screw of the worm gear jack 21 is connected to the inner ring of the ball bearing 22, so that when the screw rotates, the movable crossbeam 11 only moves up and down in a straight line, thus avoiding the problem that the movable crossbeam 11 will rotate along with the screw.
[0043] In an embodiment of this utility model, the gearbox includes: a housing 23, a first bevel gear 24, a second bevel gear 25, a first connecting shaft 26, and a second connecting shaft 27. The first connecting shaft 26 and the second connecting shaft 27 are rotatably connected to the housing 23. The first bevel gear 24 and the second bevel gear 25 are respectively mounted on the first connecting shaft 26 and the second connecting shaft 27, and the first bevel gear 24 and the second bevel gear 25 mesh and transmit power. The first connecting shaft 26 is connected to the output shaft of the motor, and the two ends of the second connecting shaft 27 are respectively connected to two connecting rods 20.
[0044] The motor operates, and its output drives the first connecting shaft 26 to rotate. When the first connecting shaft 26 rotates, it drives the first bevel gear 24 to rotate. Through the meshing transmission between the first bevel gear 24 and the second bevel gear 25, the second connecting shaft 27 and the two connecting rods 20 connected to both ends of the second connecting shaft 27 are driven to rotate, thereby achieving the purpose of simultaneously controlling the synchronous rotation of the two worm gear lifts 21.
[0045] In the embodiments of this utility model, both the upper detection interface 12 and the lower detection interface 13 are annular grooves.
[0046] By setting the detection interface as a circular groove, the bellows 33 is inserted into the circular groove of the corresponding size, which facilitates the quick installation of the bellows 33.
[0047] Specifically, the multiple annular grooves of different sizes are arranged in a concentric circle layout.
[0048] In an embodiment of this utility model, the pressure supply mechanism includes: a gas distribution tank 28, a main connecting pipe 29, a first branch connecting pipe 30, and a second branch connecting pipe 31; the gas distribution tank 28 is disposed on one side of the frame 10, one end of the main connecting pipe 29 is connected to the gas distribution tank 28, and the other end of the main connecting pipe 29 is connected to the first branch connecting pipe 30 and the second branch connecting pipe 31 respectively, and the first branch connecting pipe 30 and the second branch connecting pipe 31 are connected to the connection port 15 and the cylinder 16 respectively.
[0049] Pressurized gas is output through the main connecting pipe 29 via the gas distribution tank 28 and enters the first connecting pipe 30 and the second connecting pipe 31 respectively, thereby providing power to the cylinder 16 and conducting an airtightness test on the gas filling the bellows 33.
[0050] Specifically, the gas distribution tank 28 is connected to an external gas source, and compressed gas is introduced into the gas distribution tank 28. The gas distribution tank 28 is equipped with a filter and a dryer to filter and dehumidify the gas in the gas distribution tank 28 before discharging it, thereby achieving the purpose of adjusting the purity and moisture content of the gas.
[0051] Specifically, both the first connecting pipe 30 and the second connecting pipe 31 are equipped with solenoid valves, which are used to adjust the flow rate of the first connecting pipe 30 and the second connecting pipe 31.
[0052] In an embodiment of this utility model, there are three cylinders 16.
[0053] By setting up three cylinders 16 and evenly distributing them at three points on the upper pressure plate 17 to form a triangular point, the clamping force is evenly distributed, avoiding the problem of uneven compression of the sealing ring caused by single-point clamping.
[0054] In embodiments of this utility model, pressure gauges 32 and pressure sensors are provided on both the first connecting pipe 30 and the second connecting pipe 31. The upper pressure cover 17 is provided with a first pressure gauge 32 and a first pressure sensor, both of which are connected to the bellows. A second pressure gauge 34 and a second pressure sensor are provided on the second connecting pipe.
[0055] By providing a first pressure gauge 32 and a first pressure sensor on the upper pressure cover 17, both the first pressure gauge 32 and the first pressure sensor are connected to the bellows, enabling the first pressure sensor to detect the pressure inside the bellows 33 and feed the pressure signal back to the pressure valve group control box in real time. The first pressure gauge 32 is used to observe the inflation pressure inside the bellows 32 in real time. The second pressure gauge 34 is used to observe the working pressure of the cylinder 16 in real time, and the second pressure sensor on the second connecting pipe 31 monitors the working pressure of the cylinder 16.
[0056] Implementation process:
[0057] By placing the bellows 33 at the lower detection interface 13 of the lower pressure seat 18, the worm gear lifting mechanism drives the movable crossbeam 11 to descend until the upper pressure cover 17 approaches the top of the bellows 33 and stops. Then, the cylinder 16 is activated, causing its telescopic end to extend and move the upper pressure cover 17 downward until the top of the bellows 33 is embedded in the upper detection interface 12 of the upper pressure cover 17. The bellows 33 then stops when its upper and lower ends are tightly fitted with the sealing gaskets 14 in the upper and lower detection interfaces 13, respectively. At this point, both ends of the bellows 33 are tightly fitted with the sealing gaskets 14 of the upper pressure cover 17 and the lower pressure seat 18, thus sealing the bellows 33. Compressed gas is then introduced into the bellows 33 through the connection port 15 via the pressure air supply mechanism to test the airtightness of the bellows 33. After the test, the cylinder 16 retracts, the worm gear lifting mechanism drives the movable crossbeam 11 to rise, and the bellows 33 is removed for the next test.
[0058] By injecting compressed gas into the bellows 33, the gas intake will automatically stop and the system will enter a pressure holding state when the pressure reaches the set value. The operator can judge whether the airtightness of the bellows 33 is qualified by observing the pressure change during the pressure holding period.
[0059] Specifically, in this embodiment, the pressure value is set to 0-5 MPa.
[0060] In the description of this utility model, the term "multiple" refers to two or more. Unless otherwise explicitly defined, the terms "upper," "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model 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 this utility model. The terms "connection," "installation," "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.
[0061] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A device for testing the air tightness of a corrugated expansion joint, characterized in that, include: The machine comprises a frame, a worm gear lifting mechanism, a movable crossbeam, a pressure mechanism, an upper detection interface, a lower detection interface, sealing gaskets, a connection port, and a pressure supply mechanism. The worm gear lifting mechanism is mounted on the frame, and its moving end is connected to the movable crossbeam. The pressure mechanism includes a cylinder, an upper pressure cover, and a lower pressure seat. The cylinder is fixed to the movable crossbeam, and its telescopic end is connected to the upper pressure cover. The lower pressure seat is located at the bottom of the frame. The upper pressure cover and the lower pressure seat are respectively provided with multiple upper and lower detection interfaces of different sizes. Bellows are installed at the upper and lower detection interfaces, and sealing gaskets are provided between the bellows and the upper and lower detection interfaces. The connection port is located on the upper pressure cover. The pressure supply mechanism is located on one side of the frame, and its output end is connected to the cylinder and the connection port.
2. The air tightness test device for corrugated expansion joint according to claim 1, characterized in that, The worm gear lifting mechanism includes: two motors, two gearboxes, four connecting rods, and four worm gear lifters; the motors, gearboxes, and worm gear lifters are all fixed on the frame, the input end of the gearbox is connected to the output shaft of the motor, the output end of each gearbox is connected to one end of two connecting rods, and the other ends of the four connecting rods are connected to the input ends of the four worm gear lifters.
3. The air tightness test device for corrugated expansion joint according to claim 2, characterized in that, The outer ring of the ball bearing is fixed on the movable crossbeam, and the screw of the worm gear jack is connected to the inner ring of the ball bearing.
4. The air tightness test device for corrugated expansion joint according to claim 3, characterized in that, The gearbox includes: a housing, a first bevel gear, a second bevel gear, a first connecting shaft, and a second connecting shaft. The first connecting shaft and the second connecting shaft are rotatably connected to the housing. The first bevel gear and the second bevel gear are respectively mounted on the first connecting shaft and the second connecting shaft, and the first bevel gear and the second bevel gear mesh and drive each other. The first connecting shaft is connected to the output shaft of the motor, and the two ends of the second connecting shaft are respectively connected to the two connecting rods.
5. The air tightness test device for corrugated expansion joint according to claim 1, wherein Both the upper and lower detection interfaces are circular grooves.
6. The air tightness test device for corrugated expansion joint according to claim 1, wherein The pressure supply mechanism includes: a gas distribution tank, a main connecting pipe, a first branch connecting pipe, and a second branch connecting pipe; the gas distribution tank is located on one side of the frame, one end of the main connecting pipe is connected to the gas distribution tank, and the other end of the main connecting pipe is connected to the first branch connecting pipe and the second branch connecting pipe respectively, and the first branch connecting pipe and the second branch connecting pipe are respectively connected to the connection port and the cylinder.
7. The air tightness test device for corrugated expansion joint according to claim 1, wherein, There are 3 cylinders.
8. The air tightness test device for corrugated expansion joint according to claim 1, wherein, The upper pressure cover is equipped with a first pressure gauge and a pressure sensor. The first pressure gauge and the first pressure sensor are respectively connected to the bellows, and the second connecting pipe is equipped with a second pressure gauge and a second pressure sensor.