A device for testing lateral deviation of welded bellows

Abstract

The present invention relates to the technical field of life test equipment, specifically a lateral offset test equipment for welded bellows, comprising a test platform, wherein vertical mounting plates and lateral displacement mechanisms are fixedly provided on the left and right sides of the upper surface of the test platform, a longitudinal displacement mechanism is fixedly provided on the right side of the vertical mounting plate, a displacement plate is fixedly provided on the right surface of the displacement end of the longitudinal displacement mechanism and the upper surface of the displacement end of the lateral displacement mechanism, a mounting frame is fixedly provided on the displacement plate, a mounting plate is fixedly provided on the mounting frame, the facing sides of the two mounting plates are respectively connected to the left and right ends of the bellows, and a locking mechanism for pressing the bellows flange is fixedly provided on the mounting plate. The present invention can realize precise displacement adjustment of the bellows in different directions through the cooperation of the longitudinal displacement mechanism and the lateral displacement mechanism, thereby ensuring the accuracy of the test, breaking the original equipment that can only perform axial reciprocating motion, and realizing the lateral offset test of the bellows.

Description

Technical Field

[0001] The invention relates to the technical field of life test equipment, in particular to a lateral deviation test equipment for a welded bellows. Background Art

[0002] A welded bellows is a tubular shell manufactured using precision welding technology. It consists of multiple annular wave plates punched from thin sheets, welded alternately along their inner and outer edges to form a structure with transverse corrugations. Compared to traditional hydroformed metal bellows, welded bellows offer the advantages of high manufacturing precision, large displacement, large volume compensation, long service life, and compatibility with a wide range of materials. Therefore, welded bellows are widely used in the instrumentation, aerospace, electronics, and other industries as sealing elements, isolation components, pressure sensors, connecting elements, and temperature compensators. Sealing with welded bellows enables the transmission of reciprocating, oscillating, and rotational motion into a vacuum. High-temperature degassing treatment allows motion to be transmitted in high and even ultra-high vacuum systems.

[0003] Welded bellows are widely used in industrial applications to compensate for thermal expansion and contraction in piping systems. However, lateral deflection can occur during manufacturing and use, which can affect performance and service life. Therefore, prior to production, welded bellows require lateral deflection testing in both tension and compression. However, existing equipment is only capable of single-axis reciprocating testing and is unable to perform lateral deflection testing. Summary of the Invention

[0004] The object of the present invention is to provide a device for testing the lateral deviation of a welded bellows to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solutions: a lateral deflection test device for a welded bellows, comprising a test platform, wherein vertical mounting plates and a lateral displacement mechanism are fixedly provided on the left and right sides of the upper surface of the test platform, a longitudinal displacement mechanism is fixedly provided on the right side of the vertical mounting plate, a displacement plate is fixedly provided on the right surface of the displacement end of the longitudinal displacement mechanism and an upper surface of the displacement end of the lateral displacement mechanism, a mounting frame is fixedly provided on the displacement plate, a mounting plate is fixedly provided on the mounting frame, and facing sides of the two mounting plates are respectively connected to the left and right ends of the bellows, the mounting plate on the right side is provided with vacuum holes that pass through the left and right sides and are connected to the bellows, and a locking mechanism for pressing the bellows flange is fixedly provided on the mounting plate;

[0006] A guide tube is fixedly provided on the side wall of the mounting plate close to the bellows, and the inner diameter of the guide tube is not less than the outer diameter of the bellows flange. A sealing ring is fixedly provided on the side wall of the mounting plate close to the bellows and located inside the guide tube, and the outer diameter of the sealing ring is smaller than the outer diameter of the bellows flange, and the inner diameter of the sealing ring is larger than the inner diameter of the bellows flange. The locking mechanism includes two semicircular pressure rings movably provided in the guide tube and arranged along the front-to-back direction, two swing arm assemblies respectively connected to the opposite ends of the two semicircular pressure rings, and a driving assembly that drives the two swing arm assemblies to rotate oppositely along the horizontal plane;

[0007] The mounting plate is provided with a rotation mounting hole extending therethrough, the swing arm assembly comprising a fixed shaft fixed in the rotation mounting hole, a toothless gear rotatably connected to the fixed shaft, and a swing arm fixedly connected to the toothless gear;

[0008] The end of the swing arm fan away from the toothless gear is fixedly connected to the semicircular pressure ring, and the circumferential side wall of the guide tube is provided with a gap that runs through the front and back and allows the swing arm to pass through.

[0009] Optionally, the mounting frame includes a transverse plate, and two vertical ribs fixedly mounted on the upper surface of the transverse plate and arranged in parallel along the front-to-back direction;

[0010] The front and rear ends of the displacement plate on the left are respectively fixedly connected to the two vertical ribs on the left mounting frame, the upper surface of the displacement plate on the right is fixedly connected to the lower surface of the transverse plate on the right mounting frame, and the front and rear ends of the mounting plate are respectively fixedly connected to the two vertical ribs.

[0011] Optionally, the drive assembly includes a spur rack that moves horizontally in the front-to-rear direction and meshes with the toothless gear, an electric push rod fixed on the mounting plate away from the side wall of the bellows and located between the two swing arm assemblies, a guide wheel fixed outside the two swing arm assemblies, and a belt strip wound around the guide wheel and fixedly connected at both ends to the spur rack and the push rod end of the electric push rod, respectively.

[0012] Optionally, a fixed block is fixed on the side wall of the mounting plate away from the bellows, the axle of the guide wheel is fixedly connected to the fixed block, a guide rod is fixed on the fixed block, the guide rod slides along the front and rear directions through the straight rack, and a return spring is provided on the outer sleeve of the guide rod, and the two ends of the return spring are respectively in contact with the straight rack and the fixed block.

[0013] Optionally, the electric push rod is a ball screw type electric telescopic rod. When the push rod stroke of the electric push rod reaches the minimum, the distance between the front and rear straight racks is the largest, and the semicircular pressure ring and the sealing ring jointly clamp the bellows flange.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The present invention, through the cooperation of the longitudinal displacement mechanism and the lateral displacement mechanism, can achieve precise displacement adjustment of the bellows in different directions, ensuring the accuracy of the test. It breaks the original equipment's limitation of only axial reciprocating motion and realizes the lateral displacement test of the bellows.

[0016] 2. The present invention can reduce the gap between the bellows flange and the mounting plate through the sealing ring, achieving a good sealing effect. The cooperation between the locking mechanism and the sealing ring can effectively maintain the vacuum degree in the bellows, thereby improving the reliability of the test.

[0017] 3. The present invention realizes automatic clamping and loosening of the semicircular pressure ring through the combination of the electric push rod and the reset spring, which is easy to operate and improves the test efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the present invention;

[0019] Figure 2 Schematic diagram of the structure of the mounting frame, mounting plate, guide tube and locking mechanism in the present invention;

[0020] Figure 3 for Figure 2 A schematic diagram of the structure in which the locking mechanism is not installed;

[0021] Figure 4 A partial cross-sectional view of the mounting plate, guide tube, and locking mechanism of the present invention;

[0022] Figure 5 This is a schematic diagram of the electric push rod, guide wheel and belt structure of the present invention.

[0023] In the figure: 1. Test platform; 2. Vertical mounting plate; 3. Longitudinal displacement mechanism; 4. Horizontal displacement mechanism; 5. Displacement plate; 6. Mounting frame; 7. Mounting plate; 8. Vacuum hole; 9. Locking mechanism; 10. Horizontal plate; 11. Vertical rib plate; 12. Guide tube; 13. Notch; 14. Sealing ring; 15. Semicircular pressure ring; 16. Swing arm; 17. Toothless gear; 18. Fixed shaft; 19. Rotary mounting hole; 20. Straight rack; 21. Electric push rod; 22. Guide wheel; 23. Belt strip; 24. Fixed block; 25. Guide rod; 26. Return spring; 27. Bellows. DETAILED DESCRIPTION

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] Example: See Figure 1 and Figure 2 The present invention provides a lateral offset test device for a welded bellows, comprising a test platform 1. A vertical mounting plate 2 and a lateral displacement mechanism 4 are fixedly provided on the left and right sides of the upper surface of the test platform 1, respectively. A longitudinal displacement mechanism 3 is fixedly provided on the right side of the vertical mounting plate. A displacement plate 5 is fixedly provided on the right surface of the displacement end of the longitudinal displacement mechanism 3 and the upper surface of the displacement end of the lateral displacement mechanism 4. A mounting bracket 6 is fixedly provided on the displacement plate 5, and a mounting plate 7 is fixedly provided on the mounting bracket 6. The facing sides of the two mounting plates 7 are respectively connected to the left and right ends of the bellows 27. The mounting plate 7 on the right side is provided with a vacuum hole 8 that passes through the left and right sides and is connected to the bellows 27. The vacuum hole 8 is used to connect to an external vacuum device. A locking mechanism 9 for pressing the bellows flange is fixedly provided on the mounting plate 7.

[0026] The mounting frame 6 includes a transverse plate 10 and two vertical ribs 11 fixed to the upper surface of the transverse plate 10 and arranged parallel to the front-to-back direction. The front and rear ends of the displacement plate 5 on the left are respectively fixedly connected to the two vertical ribs 11 on the left mounting frame 6. The upper surface of the displacement plate 5 on the right is fixedly connected to the lower surface of the transverse plate 10 on the right mounting frame 6. The front and rear ends of the mounting plate 7 are respectively fixedly connected to the two vertical ribs 11.

[0027] The present invention can realize precise displacement adjustment of the bellows 27 in different directions through the cooperation of the longitudinal displacement mechanism 3 and the transverse displacement mechanism 4, thereby ensuring the accuracy of the test, breaking the original equipment that can only move axially, and realizing the lateral offset test of the bellows 27.

[0028] See also Figure 3 In addition to the above embodiment, this embodiment features a guide tube 12 fixedly mounted on the sidewall of the mounting plate 7 near the bellows 27. The inner diameter of the guide tube 12 is no less than the outer diameter of the bellows flange. A sealing ring 14 is fixedly mounted on the sidewall of the mounting plate 7 near the bellows 27 and within the guide tube 12. The outer diameter of the sealing ring 14 is smaller than the outer diameter of the bellows flange, while the inner diameter of the sealing ring 14 is larger than the inner diameter of the bellows flange. The present invention utilizes the sealing ring 14 to reduce the gap between the bellows flange and the mounting plate 7, achieving a good sealing effect and preventing gas from entering the bellows 27 during operations such as vacuuming.

[0029] See also Figure 2 In addition to the above embodiment, the locking mechanism 9 in this embodiment includes two semicircular pressure rings 15 movably arranged in the guide tube 12 and arranged along the front-to-back direction, two swing arm assemblies connected to the opposite ends of the two semicircular pressure rings 15, and a driving assembly that drives the two swing arm assemblies to rotate in opposite directions along the horizontal plane. The mounting plate 7 is provided with a rotating mounting hole 19 that passes through the left and right sides. The swing arm assembly includes a fixed shaft 18 fixedly arranged in the rotating mounting hole 19, a toothless gear 17 rotatably connected to the fixed shaft 18, and a swing arm 16 fixedly connected to the toothless gear 17. The end of the swing arm 16 away from the toothless gear 17 is fixedly connected to the semicircular pressure ring 15, and the circumferential side wall of the guide tube 12 is provided with a notch 13 that passes through the front and back and allows the swing arm 16 to pass through. Under the action of the driving assembly, the swing arm 16 can drive the semicircular pressure ring 15 to realize the opening and closing action, thereby realizing the clamping and loosening of the bellows flange.

[0030] See also Figure 4 and Figure 5 In addition to the above embodiment, the drive assembly in this embodiment includes a spur rack 20 that moves horizontally in the front-to-back direction and meshes with the toothless gear 17, an electric push rod 21 fixedly mounted on the side wall of the mounting plate 7 away from the bellows 27 and located between the two swing arm assemblies, a guide wheel 22 fixedly mounted outside the two swing arm assemblies, and a belt strip 23 wound around the guide wheel 22, with its ends fixedly connected to the spur rack 20 and the push rod ends of the electric push rod 21, respectively. A fixing block 24 is fixedly mounted on the side wall of the mounting plate 7 away from the bellows 27, the axle of the guide wheel 22 is fixedly connected to the fixing block 24, and a guide rod 25 is fixedly mounted on the fixing block 24. The guide rod 25 slides in the front-to-back direction and penetrates the spur rack 20. A return spring 26 is mounted on the outer sleeve of the guide rod 25, and the ends of the return spring 26 abut against the spur rack 20 and the fixing block 24, respectively. The electric push rod 21 is a ball screw type electric telescopic rod. When the push rod stroke of the electric push rod 21 reaches the minimum, the distance between the front and rear straight racks 20 is the largest, and the semicircular pressure ring 15 and the sealing ring 14 clamp the bellows flange together.

[0031] Start the electric push rod 21, and the push rod of the electric push rod 21 shortens, driving the belt strip 23 to realize the two spur racks 20 moving away from each other. The spur rack 20 pushes the toothless gear 17 to rotate, thereby driving the swing arm 16 to swing in the direction close to the guide tube 12 until the semicircular pressure ring 15 presses the bellows flange. When the bellows flange needs to be loosened, the push rod of the electric push rod 21 extends, and the return spring 26 provides elastic force to push the spur rack 20 to move. The spur rack 20 pushes the toothless gear 17 to rotate, driving the swing arm 16 to swing in the direction away from the guide tube 12, thereby driving the semicircular pressure ring 15 to loosen the bellows flange. The combination of the electric push rod 21 and the return spring 26 realizes the automatic clamping and loosening of the semicircular pressure ring 15, which is easy to operate and improves the testing efficiency.

[0032] The present invention effectively maintains a vacuum within the bellows 27 through the cooperation of the locking mechanism 9 and the sealing ring 14, thereby improving the reliability of the test. Before conducting a lateral deflection test on the welded bellows 27, the present invention requires that the bellows 27 be evacuated. During the lateral deflection test, the air pressure within the bellows 27 is monitored in real time for evaluation. An increase in air pressure within the bellows 27 indicates a leak. This method effectively evaluates the sealing performance and service life of the bellows 27.

[0033] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A device for testing lateral deviation of welded bellows, characterized by: The test platform (1) comprises a test platform (1), wherein a vertical mounting plate (2) and a lateral displacement mechanism (4) are fixedly provided on the left and right sides of the upper surface of the test platform (1), a longitudinal displacement mechanism (3) is fixedly provided on the right side of the vertical mounting plate, a displacement plate (5) is fixedly provided on the right surface of the displacement end of the longitudinal displacement mechanism (3) and the upper surface of the displacement end of the lateral displacement mechanism (4), a mounting frame (6) is fixedly provided on the displacement plate (5), a mounting plate (7) is fixedly provided on the mounting frame (6), and the facing sides of the two mounting plates (7) are respectively connected to the left and right ends of the bellows (27), the mounting plate (7) located on the right side is provided with a vacuum hole (8) which passes through the left and right sides and is connected to the bellows (27), and a locking mechanism (9) for pressing the bellows flange is fixedly provided on the mounting plate (7); A guide tube (12) is fixedly provided on the side wall of the mounting plate (7) close to the bellows (27), and the inner diameter of the guide tube (12) is not less than the outer diameter of the bellows flange. A sealing ring (14) is fixedly provided on the side wall of the mounting plate (7) close to the bellows (27) and located inside the guide tube (12), and the outer diameter of the sealing ring (14) is smaller than the outer diameter of the bellows flange, and the inner diameter of the sealing ring (14) is larger than the inner diameter of the bellows flange. The locking mechanism (9) includes two semicircular pressure rings (15) movably arranged in the guide tube (12) and arranged along the front-back direction, two swing arm assemblies respectively connected to the opposite ends of the two semicircular pressure rings (15), and a driving assembly for driving the two swing arm assemblies to rotate in opposite directions along the horizontal plane. The mounting plate (7) is provided with a rotation mounting hole (19) extending therethrough, and the swing arm assembly comprises a fixed shaft (18) fixedly arranged in the rotation mounting hole (19), a toothless gear (17) rotatably connected to the fixed shaft (18), and a swing arm (16) fixedly connected to the toothless gear (17); The end of the swing arm (16) away from the toothless gear (17) is fixedly connected to the semicircular pressure ring (15), and the circumferential side wall of the guide tube (12) is provided with a notch (13) that runs through the front and back and allows the swing arm (16) to pass through.

2. A lateral deflection testing device for welded bellows according to claim 1, characterized in that: The mounting frame (6) includes a transverse plate (10), and two vertical ribs (11) fixed to the upper surface of the transverse plate (10) and arranged in parallel along the front-to-back direction; The front and rear ends of the displacement plate (5) on the left are respectively fixedly connected to the two vertical ribs (11) on the left mounting frame (6); the upper surface of the displacement plate (5) on the right is fixedly connected to the lower surface of the transverse plate (10) on the right mounting frame (6); and the front and rear ends of the mounting plate (7) are respectively fixedly connected to the two vertical ribs (11).

3. The lateral deflection testing device for a welded bellows according to claim 1, characterized in that: The driving assembly includes a spur rack (20) that moves horizontally in the front-back direction and meshes with the toothless gear (17), an electric push rod (21) fixedly arranged on the side wall of the mounting plate (7) away from the bellows (27) and located between the two swing arm assemblies, a guide wheel (22) fixedly arranged outside the two swing arm assemblies, and a belt strip (23) wound around the guide wheel (22) and having its two ends fixedly connected to the spur rack (20) and the push rod end of the electric push rod (21), respectively.

4. The lateral deflection testing device for a welded bellows according to claim 3, characterized in that: A fixing block (24) is fixedly provided on the side wall of the mounting plate (7) away from the bellows (27); the axle of the guide wheel (22) is fixedly connected to the fixing block (24); a guide rod (25) is fixedly provided on the fixing block (24); the guide rod (25) slides through the spur rack (20) in the front-back direction; a return spring (26) is provided on the outer sleeve of the guide rod (25); two ends of the return spring (26) are respectively in contact with the spur rack (20) and the fixing block (24).

5. The device for testing lateral deviation of a welded bellows according to claim 3, characterized in that: The electric push rod (21) is a ball screw type electric telescopic rod. When the push rod stroke of the electric push rod (21) reaches the minimum, the distance between the front and rear two straight racks (20) is the maximum, and the semicircular pressure ring (15) and the sealing ring (14) jointly clamp the bellows flange.

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