Welded corrugated pipe lateral deviation testing equipment

Abstract

The invention relates to the technical field of service life testing equipment, in particular to welded corrugated pipe lateral deviation testing equipment which comprises a testing platform, a vertical mounting vertical plate and a transverse displacement mechanism are fixedly arranged on the left side and the right side of the upper surface of the testing platform respectively, and a longitudinal displacement mechanism is fixedly arranged on the right side of the vertical mounting vertical plate. Displacement plates are fixedly arranged on the right surface of the displacement end of the longitudinal displacement mechanism and the upper surface of the displacement end of the transverse displacement mechanism, mounting frames are fixedly arranged on the displacement plates, mounting plates are fixedly arranged on the mounting frames, and the opposite side faces of the two mounting plates are connected with the left end and the right end of a corrugated pipe correspondingly; and a locking mechanism for pressing the corrugated pipe flange is fixedly arranged on the mounting plate. Through cooperation of the longitudinal displacement mechanism and the transverse displacement mechanism, accurate displacement adjustment of the corrugated pipe in different directions can be achieved, the test accuracy is ensured, the situation that original equipment can only do axial reciprocating motion is broken through, and a lateral deviation test of the corrugated pipe is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of life testing equipment, and specifically to a lateral offset testing device for welded bellows. Background Art

[0002] A welded bellows is a tubular shell manufactured using precision welding technology. It consists of multiple annular wafers stamped from thin plates, and these wafers are alternately welded along their inner and outer edges to form a structure with transverse corrugations. Compared with traditional hydraulically formed metal bellows, welded bellows have the advantages of high manufacturing precision, large displacement, large volume compensation, long service life, and a wide range of applicable materials. Therefore, welded bellows are widely used in the instrument industry, aerospace field, electronics industry, and other industries as sealing elements, isolation elements, pressure-sensitive elements, connecting elements, and temperature compensators. Using a welded bellows for sealing can achieve the transmission of reciprocating motion, swinging motion, and rotational motion into a vacuum. If it undergoes high-temperature degassing treatment, it can also transmit motion in a high-vacuum or even ultra-high-vacuum system.

[0003] Welded bellows are widely used in industrial applications to compensate for the thermal expansion and contraction of pipeline systems. However, lateral offset may occur during the manufacturing and use of bellows, which can affect their performance and service life. Therefore, before producing welded bellows, it is necessary to conduct lateral offset tensile and compressive reciprocating life tests on them. However, existing equipment can only meet axial single reciprocating tests and cannot achieve lateral offset tests. Summary of the Invention

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

[0005] To achieve the above purpose, the present invention provides the following technical solution: A lateral offset testing device for welded bellows, including a test platform. On the upper surface of the test platform, a vertical installation plate and a lateral displacement mechanism are respectively and fixedly arranged on the left and right sides. On the right side of the vertical installation plate, a longitudinal displacement mechanism is fixedly arranged. On the right surface of the displacement end of the longitudinal displacement mechanism and on the upper surface of the displacement end of the lateral displacement mechanism, displacement plates are fixedly arranged. On the displacement plates, mounting frames are fixedly arranged. On the mounting frames, mounting plates are fixedly arranged. The opposite sides of the two mounting plates are respectively connected to the left and right ends of the bellows. On the mounting plate on the right side, a vacuum extraction hole that penetrates left and right and communicates with the bellows is provided. On the mounting plate, a locking mechanism for pressing the bellows flange is fixedly arranged.

[0006] Optionally, the mounting frame includes a transverse plate, and two vertical rib plates fixedly arranged on the upper surface of the transverse plate and arranged in parallel along the front and rear directions; The front and rear ends of the displacement plate on the left side are respectively fixedly connected to the two vertical rib plates of the mounting frame on the left side. The upper surface of the displacement plate on the right side is fixedly connected to the lower surface of the transverse plate of the mounting frame on the right side. The front and rear ends of the mounting plate are respectively fixedly connected to the two vertical rib plates.

[0007] Optionally, a guiding tube is fixedly provided on the side wall of the mounting plate close to the corrugated pipe. The inner diameter of the guiding tube is not less than the outer diameter of the corrugated pipe flange. A sealing ring is fixedly provided on the side wall of the mounting plate close to the corrugated pipe and inside the guiding tube. The outer diameter of the sealing ring is smaller than the outer diameter of the corrugated pipe flange, and the inner diameter of the sealing ring is larger than the inner diameter of the corrugated pipe flange.

[0008] Optionally, the locking mechanism includes two semi-circular pressing rings movably arranged in the guiding tube and arranged in the front-rear direction, two swing arm assemblies respectively connected to the opposite ends of the two semi-circular pressing rings, and a driving assembly for driving the two swing arm assemblies to rotate away from each other on the horizontal plane.

[0009] Optionally, the mounting plate is provided with a rotation mounting hole penetrating through the left and right. The swing arm assembly includes a fixed shaft fixedly arranged in the rotation mounting hole, a toothless gear rotatably connected to the fixed shaft, and a swing arm fixedly connected to the toothless gear; The end of the swing arm away from the toothless gear is fixedly connected to the semi-circular pressing ring. A notch penetrating through the front and rear and allowing the swing arm to pass through is provided on the circumferential side wall of the guiding tube.

[0010] Optionally, the driving assembly includes a straight rack that moves horizontally in the front-rear direction and meshes with the toothless gear, an electric push rod fixedly arranged on the side wall of the mounting plate away from the corrugated pipe and between the two swing arm assemblies, a guide wheel fixedly arranged outside the two swing arm assemblies, and a belt strip wound around the guide wheel and fixedly connected to the straight rack and the push rod end of the electric push rod at both ends respectively.

[0011] Optionally, a fixed block is fixedly provided on the side wall of the mounting plate away from the corrugated pipe. The wheel shaft of the guide wheel is fixedly connected to the fixed block. A guide rod is fixedly provided on the fixed block. The guide rod slidably penetrates through the straight rack in the front-rear direction. A return spring is sleeved outside the guide rod. The two ends of the return spring respectively abut against the straight rack and the fixed block.

[0012] 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 semi-circular pressing ring and the sealing ring jointly clamp the corrugated pipe flange.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. Through the cooperation of the longitudinal displacement mechanism and the transverse displacement mechanism, the present invention can achieve precise displacement adjustment of the bellows in different directions, ensuring the accuracy of the test, breaking the original equipment that can only move back and forth axially, and realizing the lateral offset test of the bellows; 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, and can effectively maintain the vacuum degree inside the bellows through the cooperation of the locking mechanism and the sealing ring, improving the reliability of the test; 3. The present invention realizes the automatic clamping and loosening of the semi-circular pressing ring through the combination of the electric push rod and the return spring, with simple operation and improved test efficiency. Brief Description of the Drawings

[0014] Figure 1 is a schematic structural diagram of the present invention; Figure 2 is a schematic structural diagram of the mounting frame, mounting plate, guiding tube and locking mechanism in the present invention; Figure 3 is Figure 2 a schematic structural diagram without the locking mechanism in; Figure 4 is a partial cross-sectional view of the mounting plate, guiding tube and locking mechanism in the present invention; Figure 5 is a schematic structural diagram of the electric push rod, guiding wheel and belt strip in the present invention.

[0015] In the figure: 1, test platform; 2, vertical mounting vertical plate; 3, longitudinal displacement mechanism; 4, transverse displacement mechanism; 5, displacement plate; 6, mounting frame; 7, mounting plate; 8, vacuum pumping hole; 9, locking mechanism; 10, transverse plate; 11, vertical rib plate; 12, guiding tube; 13, notch; 14, sealing ring; 15, semi-circular pressing ring; 16, swing arm; 17, toothless gear; 18, fixed shaft; 19, rotating mounting hole; 20, straight rack; 21, electric push rod; 22, guiding wheel; 23, belt strip; 24, fixed block; 25, guiding rod; 26, return spring; 27, bellows. Detailed Embodiments

[0016] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0017] Embodiment: Please refer to Figure 1 and Figure 2, the present invention provides a lateral offset test device for a welded bellows, including a test platform 1. On the upper surface of the test platform 1, a vertical installation stand 2 and a lateral displacement mechanism 4 are respectively and fixedly arranged on the left and right sides. On the right side of the vertical installation stand, a longitudinal displacement mechanism 3 is fixedly arranged. 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 displacement plate 5 is fixedly arranged. On the displacement plate 5, a mounting frame 6 is fixedly arranged. On the mounting frame 6, a mounting plate 7 is fixedly arranged. The opposite sides of the two mounting plates 7 are respectively connected to the left and right ends of the bellows 27. On the mounting plate 7 located on the right side, a vacuum extraction hole 8 that penetrates left and right and communicates with the bellows 27 is provided. The vacuum extraction hole 8 is used to connect to an external vacuum extraction device. A locking mechanism 9 for pressing the bellows flange is fixedly arranged on the mounting plate 7.

[0018] Among them, the mounting frame 6 includes a transverse plate 10, and two vertical rib plates 11 fixedly arranged on the upper surface of the transverse plate 10 and arranged in parallel in the front-rear direction. The front and rear ends of the displacement plate 5 on the left side are respectively fixedly connected to the two vertical rib plates 11 of the mounting frame 6 on the left side. The upper surface of the displacement plate 5 on the right side is fixedly connected to the lower surface of the transverse plate 10 of the mounting frame 6 on the right side. The front and rear ends of the mounting plate 7 are respectively fixedly connected to the two vertical rib plates 11.

[0019] Through the cooperation of the longitudinal displacement mechanism 3 and the lateral displacement mechanism 4, the present invention can achieve precise displacement adjustment of the bellows 27 in different directions, ensure the accuracy of the test, break the original equipment that can only perform reciprocating axial movement, and realize the lateral offset test of the bellows 27.

[0020] Please refer to Figure 3 , on the basis of the above-mentioned embodiment, in this embodiment, a guiding tube 12 is fixedly arranged on the side wall of the mounting plate 7 close to the bellows 27. The inner diameter of the guiding tube 12 is not less than the outer diameter of the bellows flange. On the side wall of the mounting plate 7 close to the bellows 27 and inside the guiding tube 12, a sealing ring 14 is fixedly arranged. 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. Through the sealing ring 14, the present invention can reduce the gap between the bellows flange and the mounting plate 7, achieve a good sealing effect, and prevent gas from entering the bellows 27 during operations such as vacuum extraction.

[0021] Please refer to Figure 2, based on the above embodiments, in this embodiment, the locking mechanism 9 includes two semi-circular pressing rings 15 movably arranged in the guiding tube 12 and arranged in the front-rear direction, two swing arm assemblies respectively connected to the opposite end parts of the two semi-circular pressing rings 15, and a driving assembly for driving the two swing arm assemblies to rotate away from each other on the horizontal plane. The mounting plate 7 is provided with a rotation mounting hole 19 penetrating left and right. The swing arm assembly includes 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 semi-circular pressing ring 15. The circumferential side wall of the guiding tube 12 is provided with a notch 13 penetrating through the front and rear and allowing the swing arm 16 to pass through. The swing arm 16 can drive the semi-circular pressing ring 15 to perform an opening and closing action under the action of the driving assembly, so as to clamp and loosen the corrugated pipe flange.

[0022] Please refer to Figure 4 and Figure 5 , based on the above embodiments, in this embodiment, the driving assembly includes a straight rack 20 that moves horizontally in the front-rear 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 corrugated pipe 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 fixedly connected to the straight rack 20 and the push rod end of the electric push rod 21 at both ends respectively. Among them, a fixed block 24 is fixedly arranged on the side wall of the mounting plate 7 away from the corrugated pipe 27. The wheel shaft of the guide wheel 22 is fixedly connected to the fixed block 24. A guide rod 25 is fixedly arranged on the fixed block 24. The guide rod 25 slidably penetrates through the straight rack 20 in the front-rear direction. A return spring 26 is sleeved outside the guide rod 25. The two ends of the return spring 26 are respectively abutted against the straight rack 20 and the fixed block 24. 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 semi-circular pressing ring 15 and the sealing ring 14 jointly clamp the corrugated pipe flange.

[0023] Start the electric push rod 21. The push rod of the electric push rod 21 shortens, driving the belt strip 23 to move the two straight racks 20 away from each other. The straight rack 20 pushes the toothless gear 17 to rotate, and then drives the swing arm 16 to swing towards the direction close to the guiding tube 12 until the semi-circular pressing ring 15 presses the corrugated pipe flange. When it is necessary to loosen the corrugated pipe flange, the push rod of the electric push rod 21 elongates, and the return spring 26 provides an elastic acting force to push the straight rack 20 to move. The straight rack 20 pushes the toothless gear 17 to rotate, driving the swing arm 16 to swing away from the guiding tube 12, thereby driving the semi-circular pressing ring 15 to loosen the corrugated pipe flange. The combination of the electric push rod 21 and the return spring 26 realizes the automatic clamping and loosening of the semi-circular pressing ring 15, with simple operation and improved testing efficiency.

[0024] The present invention can effectively maintain the vacuum degree inside the bellows 27 through the cooperation of the locking mechanism 9 and the sealing ring 14, improving the reliability of the test. Before conducting the lateral offset test of the welded bellows 27, the present invention needs to first perform a vacuuming operation on the bellows 27. During the lateral offset test, the evaluation is carried out by monitoring the air pressure change inside the bellows 27 in real time. If the air pressure inside the bellows 27 increases, it indicates that there is a leakage problem with the bellows 27. In this way, the present invention can effectively evaluate the sealing performance and service life of the bellows 27.

[0025] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A lateral offset test device for welded bellows, characterized in that: It includes a test platform (1). On the left and right sides of the upper surface of the test platform (1), a vertical installation vertical plate (2) and a transverse displacement mechanism (4) are respectively fixedly arranged. On the right side of the vertical installation vertical plate, a longitudinal displacement mechanism (3) is fixedly arranged. On the right surface of the displacement end of the longitudinal displacement mechanism (3) and on the upper surface of the displacement end of the transverse displacement mechanism (4), displacement plates (5) are fixedly arranged. On the displacement plates (5), mounting frames (6) are fixedly arranged. On the mounting frames (6), mounting plates (7) are fixedly arranged. The opposite sides of the two mounting plates (7) are respectively connected to the left and right ends of a corrugated pipe (27). On the mounting plate (7) on the right side, a vacuum extraction hole (8) that penetrates left and right and is communicated with the corrugated pipe (27) is provided. On the mounting plate (7), a locking mechanism (9) for pressing the corrugated pipe flange is fixedly arranged.

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

3. The lateral offset test device for a welded bellows according to claim 1, wherein: On the side wall of the mounting plate (7) close to the corrugated pipe (27), a guiding pipe (12) is fixedly arranged. The inner diameter of the guiding pipe (12) is not less than the outer diameter of the corrugated pipe flange. On the side wall of the mounting plate (7) close to the corrugated pipe (27) and inside the guiding pipe (12), a sealing ring (14) is fixedly arranged. The outer diameter of the sealing ring (14) is less than the outer diameter of the corrugated pipe flange, and the inner diameter of the sealing ring (14) is greater than the inner diameter of the corrugated pipe flange.

4. The lateral offset test device for a welded bellows according to claim 3, wherein: The locking mechanism (9) includes two semi-circular pressing rings (15) movably arranged in the guiding pipe (12) and arranged in the front-rear direction, two swing arm assemblies respectively connected to the opposite ends of the two semi-circular pressing rings (15), and a driving assembly for driving the two swing arm assemblies to rotate away from each other on the horizontal plane.

5. The lateral offset test device for a welded bellows according to claim 4, characterized in that: The mounting plate (7) is provided with a rotation mounting hole (19) that penetrates left and right. The swing arm assembly includes 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) far from the toothless gear (17) is fixedly connected to the semi-circular pressing ring (15). On the circumferential side wall of the guiding pipe (12), a notch (13) that penetrates front and rear and allows the swing arm (16) to pass through is provided.

6. The lateral offset test device for a welded bellows according to claim 5, characterized in that: The driving assembly includes a straight rack (20) that moves horizontally in the front-rear direction and meshes with the toothless gear (17), an electric push rod (21) fixedly arranged on the side wall of the mounting plate (7) far from the corrugated pipe (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 fixedly connected to the push rod ends of the straight rack (20) and the electric push rod (21) at both ends respectively.

7. The lateral offset test device for a welded bellows according to claim 6, wherein: A fixed block (24) is fixedly arranged on the side wall of the mounting plate (7) far from the corrugated pipe (27). The wheel shaft of the guide wheel (22) is fixedly connected to the fixed block (24). A guide rod (25) is fixedly arranged on the fixed block (24). The guide rod (25) slidably penetrates through the straight rack (20) in the front-rear direction. A return spring (26) is sleeved outside the guide rod (25). The two ends of the return spring (26) are respectively abutted against the straight rack (20) and the fixed block (24).

8. The lateral offset test device for a welded bellows according to claim 6, 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 straight racks (20) is the largest, and the semi-circular pressing ring (15) and the sealing ring (14) jointly clamp the corrugated pipe flange.

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