Swing fatigue test device for metal bellows

Abstract

The utility model discloses a swing fatigue test device for a metal bellows, which comprises a base, a swing cylinder and a swing frame, the swing frame comprises two swing seats arranged on the base at an interval, and a swing rod is mounted on the swing seats through a swing shaft; a positioning seat is fixed between the two swing seats, the upper end surface of the positioning seat is a mounting surface, two ends of the cross beam are mounted on the two swing rods, the swing cylinder is fixedly mounted on the base, a swing arm is mounted on a swing table of the swing cylinder, and the other end of the swing arm is connected to the cross beam; the central axis of the swing shaft is collinear with the central axis of the swing table, and the central axis of the swing shaft is coplanar with the mounting surface of the positioning seat; a pressurizing hole is formed in the positioning seat, and one end of the pressurizing hole penetrates through the mounting surface and the side surface of the positioning seat respectively. The swing frame is driven by the swing air cylinder to swing, a swing fatigue detection test is carried out on the metal corrugated pipe, setting of any swing angle under existing requirements can be met, limitation on the swing amplitude is avoided, and the swing angle can be adjusted at any time.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of swing fatigue test devices of metal bellows. BACKGROUND

[0002] Due to the good elasticity and sealing characteristics of metal bellows, axial compensation and circumferential displacement can be carried out under external force, and it is widely used in the conveying pipeline of liquid or gas and other fluids. Since it needs to be bent frequently, swing fatigue test needs to be carried out to detect its swing fatigue life.

[0003] The existing swing fatigue test device is fixed at one end of the bellows when working, and the other end is slidably pressed in an arc-shaped groove as a swing end, then a slide rod is used to drive the swing end to slide along the arc-shaped groove, thereby driving the entire bellows to reciprocate. However, due to the limited movement range of the slide rod, the swing range of the bellows is limited, and the swing range of the bellows cannot be adjusted in a large range, which limits the detection range of the test device.

[0004] Therefore, it is necessary to expand the adjustment range of the swing fatigue test device for the swing range of the bellows to meet the needs of different customers. SUMMARY

[0005] To solve the problem of limited swing range of the swing fatigue test device in the prior art, the present application provides a swing fatigue test device for metal bellows, which includes a base, a swing cylinder and a swing frame. The swing frame includes two swing seats spaced apart along a first axis direction and mounted on the base. A swing shaft is mounted on each swing seat to swing a swing rod. The swing shaft extends along the first axis direction, and the two swing rods are parallel to each other and perpendicular to the first axis direction.

[0006] A positioning seat is fixed between the two swing seats. The upper end face of the positioning seat is formed as a mounting surface for mounting the metal bellows to be tested. The mounting surface is a horizontal surface. The two ends of the cross beam are detachably mounted on the two swing rods, and the cross beam can be adjusted along the length direction of the swing rod. The swing cylinder is fixedly installed on the base and located on one side of the swing frame along the first axis direction. A swing arm is fixedly installed on the swing platform of the swing cylinder. The swing arm is fixedly connected to the cross beam. The center axes of the two swing shafts and the center axis of the swing platform extend along the first axis direction and are collinear. The center axis of the swing shaft is coplanar with the mounting surface of the positioning seat. A pressurizing hole is formed in the positioning seat. One end of the pressurizing hole penetrates the mounting surface of the positioning seat upward, and the other end of the pressurizing hole penetrates the side surface of the positioning seat. Specifically, the swing cylinder is a gear rack type swing cylinder.

[0007] When this application is in operation, firstly, the position of the swing arm is adjusted using the swing cylinder, causing the swing arm to extend upwards and drive the swing rod to extend vertically. Then, the position of the swing rod is fixed, and the height of the crossbeam is adjusted so that the distance between the crossbeam and the mounting surface is slightly greater than the length of the metal bellows to be tested. Then, the first flange at one end of the metal bellows to be tested is fixed to the side of the crossbeam facing the base using the first bolt, and a first sealing gasket is placed between the first flange and the end plate to seal the gap between the first flange and the crossbeam, allowing the metal bellows to be tested to be in a natural state. A second sealing gasket is placed on the mounting surface, with the second sealing gasket facing the metal bellows to be tested. Then, the height of the crossbeam is adjusted downwards so that the second flange at the lower end of the metal bellows to be tested is just in contact with the second sealing gasket. The position of the crossbeam on the swing rod is then fixed. Next, the second flange is fixed to the positioning seat using the second bolt, and the second sealing gasket seals the gap between the second flange and the positioning seat. Using the pressurization setting, pressure is injected into the metal bellows to be tested through the pressurization hole according to the requirements until the set pressure is reached. After pressurization is completed, the pressurization pipe is closed. The swing cylinder is activated, and the swing arm drives the crossbeam and swing rod to swing around the swing axis, synchronously driving the metal bellows under test to swing. The test is then conducted on the metal bellows. After the test requirements are met, the metal bellows is checked for leakage, completing the swing fatigue test. In this application, a swing cylinder is used as the driving device to drive the swing frame to swing around the swing axis, thereby performing a swing fatigue test on the metal bellows under test. The swing cylinder allows for relatively precise setting of the swing angle, and the maximum swing angle of the swing cylinder can reach 180°, which can meet any swing angle setting under existing requirements, avoiding limitations on the swing amplitude, and allowing for adjustment of the swing angle at any time.

[0008] Furthermore, to reduce the width of the crossbeam, an end plate is fixed on the side of the crossbeam facing the positioning seat. The end of the metal bellows to be tested, away from the positioning seat, can be detachably mounted on this end plate. The end plate can be integrally formed on the crossbeam or installed on the crossbeam in a secondary mounting manner. By using the end plate, the width of the crossbeam can be reduced, thereby reducing the weight and cost of the equipment while ensuring strength.

[0009] Furthermore, to facilitate the adjustment of the crossbeam's position, two positioning nuts are screwed onto each swing arm. The two positioning nuts on each swing arm are located on opposite sides of the crossbeam, and both positioning nuts press against the crossbeam.

[0010] Furthermore, to facilitate the adjustment of the crossbeam position, a guide rod hole is provided at the end of the swing arm away from the swing cylinder, and a guide rod is fixed on the side of the crossbeam away from the positioning seat. The guide rod extends in the direction away from the positioning seat and is parallel to the swing rod. The guide rod is inserted into the guide rod hole and fixed to the swing arm by a set screw. When the metal bellows to be tested extends in a straight line, the guide rod is coaxial with the metal bellows to be tested.

[0011] Specifically, for ease of installation, each swing seat has two upward-protruding lugs, and the swing rod is inserted between the two lugs of the same swing seat. Attached Figure Description

[0012] Figure 1 This is a structural schematic diagram of an embodiment of the present invention. Detailed Implementation

[0013] The following describes the oscillation fatigue testing apparatus for the metal bellows in this application. Please refer to [link / reference]. Figure 1 In the attached diagram, the direction of the first arrow X indicates the direction of the first axis, which is the oscillating fatigue testing device.

[0014] The system includes a base 11, a swing cylinder 60, and a swing frame 20. The swing frame 20 includes two swing seats 21 spaced apart on the base along a first axis. Each swing seat has two upwardly protruding lugs 211, and a slot is formed between the two lugs of the same swing seat. One end of the corresponding swing rod 26 is inserted between the two lugs of the same swing seat. A swing shaft 22 passes through the two lugs and the swing rod and is fixed to the swing seat by a first nut 23, so that the swing rod is oscillatingly mounted on the swing seat via the swing shaft. The swing shaft extends along the first axis, and the two swing rods are parallel to each other and perpendicular to the first axis.

[0015] A positioning seat 31 is fixed between the two swing seats 21. The upper surface of the positioning seat 31 is formed as a mounting surface 311 for mounting the metal bellows 50 to be tested. The mounting surface 311 is a horizontal plane. The two ends of the crossbeam 28 are detachably mounted on the two swing rods. In this embodiment, the swing rod is a threaded rod, and two positioning nuts 27 are screwed onto each swing rod. The two positioning nuts on each swing rod are located on opposite sides of the crossbeam 28. The two positioning nuts press against the crossbeam, thereby fixing the crossbeam to the two swing rods, so that the crossbeam can be adjusted along the length of the swing rod. When it is necessary to adjust the position of the crossbeam on the swing rod, the positioning nuts are loosened and then readjusted to the required position, thus adjusting the position of the crossbeam.

[0016] An end plate 34 is fixed on the side of the crossbeam 28 facing the positioning seat 31. One end of the metal bellows 50 to be tested can be mounted on the mounting surface, and the end of the metal bellows to be tested away from the positioning seat 31 can be detachably mounted on the end plate 34. To facilitate pressurization into the metal bellows to be tested, a pressurization hole 32 is provided on the positioning seat 31. One end of the pressurization hole extends upward through the mounting surface of the positioning seat and forms a fluid outlet, while the other end extends through the side of the positioning seat and forms a fluid inlet. The pressurization port of the pressurization device can be connected to the fluid inlet, and high-pressure gas or high-pressure gas can be injected into the bellows to be tested according to different requirements.

[0017] The swing cylinder 60 is fixedly mounted on the base 11 and located on one side of the first axis of the swing frame. In this embodiment, to facilitate the installation of the swing cylinder, an L-shaped connecting seat 61 is welded on the base. The connecting seat 61 has an upward extension to the upright plate 611. The swing cylinder is fixedly mounted on the connecting seat with bolts so that the central axis of the swing platform 601 of the swing cylinder can extend horizontally. The central axes of the two swing shafts and the central axis of the swing platform all extend along the first axis and are collinear. The central axis of the swing shaft is coplanar with the mounting surface of the positioning seat. Specifically, in this embodiment, the swing cylinder is a rack and pinion type swing cylinder.

[0018] A generally L-shaped swing arm 63 is fixedly installed on the swing platform 601 of the swing cylinder, and the end of the swing arm away from the swing cylinder is fixedly connected to the crossbeam.

[0019] To facilitate the swinging of the swing frame, a guide head 64 is provided at the end of the swing arm 62 away from the swing cylinder, and a guide rod hole 641 is opened in the guide head. A guide rod 29 is fixed on the side of the crossbeam 28 away from the positioning seat 31. The guide rod extends away from the positioning seat and is parallel to the swing arm. The guide rod is inserted into the guide rod hole and fixed on the swing arm by a set screw 65. When the metal bellows to be tested extends in a straight line, the guide rod is coaxial with the metal bellows to be tested.

[0020] When this embodiment is in operation, firstly, the position of the swing arm is adjusted using the swing cylinder, causing the swing arm to extend upwards and the swing rod to extend vertically. Then, while maintaining the vertical extension of the swing rod, the set screw 65 is loosened, and the positioning nut is loosened. The height of the crossbeam 28 is adjusted so that the distance between the end plate 34 and the mounting surface 311 is slightly greater than the length of the metal bellows to be tested. Then, the first flange 51 at one end of the metal bellows to be tested is fixed to the side of the end plate 34 facing the base using the first bolt 53, and a first sealing washer 52 is placed between the first flange and the end plate to seal the gap between the first flange and the end plate. The metal bellows to be tested is brought to a natural state, and a second sealing washer 57 is placed on the mounting surface 311, with the second sealing washer 57 facing the metal bellows to be tested. Then, the positioning nut on the lower side of the crossbeam is screwed downwards so that the second flange 56 at the lower end of the metal bellows to be tested is just in contact with the second sealing washer. The positioning nut is then screwed on to fix the position of the crossbeam on the swing rod. The second flange is then fixed to the positioning seat 31 using the second bolt 58, and the second sealing gasket seals the gap between the second flange and the positioning seat 31. Using the pressurization setting, pressure is applied to the metal bellows under test through the pressurization hole 32 according to requirements until the set pressure is reached. After pressurization is complete, the pressurization pipe is closed. The swing cylinder is activated, and the swing frame drives the bellows under test to swing, performing the test. After the test requirements are met, the metal bellows under test is checked for leakage, completing the swing fatigue test of the metal bellows under test.

Claims

1. A swing fatigue testing device for a metal bellows, characterized in that, The device includes a base, a swing cylinder, and a swing frame. The swing frame includes two swing seats spaced apart on the base along a first axis. Each swing seat has a swing rod oscillatingly mounted on it via a swing shaft extending along the first axis. The two swing rods are parallel to each other and perpendicular to the first axis. A positioning seat is fixed between two swing seats. The upper surface of the positioning seat is formed as a mounting surface for mounting the metal bellows to be tested. The mounting surface is a horizontal plane. The two ends of the crossbeam are detachably mounted on two swing rods, and the crossbeam can be adjusted along the length of the swing rods. The swing cylinder is fixedly mounted on the base and located on one side of the first axis of the swing frame. A swing arm is fixedly mounted on the swing platform of the swing cylinder and is fixedly connected to the crossbeam. The central axes of the two swing shafts and the central axis of the swing platform extend along the first axis and are collinear. The central axis of the swing shaft is coplanar with the mounting surface of the positioning seat. A pressure hole is opened on the positioning seat. One end of the pressure hole extends upward through the mounting surface of the positioning seat, and the other end of the pressure hole extends through the side of the positioning seat.

2. The oscillating fatigue testing device according to claim 1, characterized in that, An end plate is fixed on the side of the crossbeam facing the positioning seat, and the end of the metal bellows to be tested away from the positioning seat can be detachably mounted on the end plate.

3. The oscillating fatigue testing device according to claim 1, characterized in that, Two positioning nuts are screwed onto each swing arm. The two positioning nuts on each swing arm are located on opposite sides of the crossbeam, and both positioning nuts press against the crossbeam.

4. The oscillating fatigue testing device according to claim 1, characterized in that, A guide rod hole is provided at the end of the swing arm away from the swing cylinder. A guide rod is fixed on the side of the crossbeam away from the positioning seat. The guide rod extends away from the positioning seat and is parallel to the swing arm. The guide rod is inserted into the guide rod hole and fixed to the swing arm by a set screw. When the metal bellows to be tested extends in a straight line, the guide rod is coaxial with the metal bellows to be tested.

5. The oscillating fatigue testing apparatus according to claim 1, characterized in that, The swing cylinder is a rack and pinion type swing cylinder.

6. The oscillating fatigue testing apparatus according to claim 1, characterized in that, Each swing seat has two upward-protruding lugs, and the swing rod is inserted between the two lugs of the same swing seat.

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