Bulging device for metal corrugated pipe

Abstract

The utility model discloses a metal corrugated pipe bulging device which comprises a device body, a boss is arranged on the device body in a protruding mode, a transmission cavity is formed in the device body, a rotating disc is rotationally installed in the transmission cavity, and a servo motor is installed at the bottom of the device body. Two hydraulic telescopic cylinders drive two arc-shaped positioning blocks to get close to each other and clamp and fix a metal thin-walled pipe, so that the metal thin-walled pipe does not need to be held by hands, a servo motor can drive a rotating disc to rotate at the moment, and then four bulging blocks can get away from each other under the dual limitation of arc-shaped guide grooves and rectangular sliding holes, so that the metal thin-walled pipe is clamped and fixed. Bulging of the metal thin-walled tube is achieved through mutual matching of the bulging petals on the bulging blocks and the positioning petals on the arc-shaped positioning blocks, and the distance between every two adjacent bulging corrugations can be well guaranteed due to the fact that the multiple bulging petals and the arc-shaped positioning blocks are arranged in a staggered mode.

Description

Technical Field

[0001] This utility model relates to the technical field of metal expander production equipment, specifically a metal bellows expansion device. Background Technology

[0002] The main body of a metal expansion joint is actually an elastic element, primarily composed of a metal bellows and upper and lower cover plates welded to both ends of the bellows. When the volume of the insulating oil inside the instrument transformer or transformer changes due to temperature variations, the volume of the expansion joint changes accordingly, thus providing volume compensation. The expansion and contraction of the metal bellows plays a crucial role in this volume compensation; therefore, its forming quality is extremely important, directly affecting the compensation effect and service life.

[0003] Currently, in order to solve the problems of complex structure and high manufacturing cost of metal bellows forming molds, the applicant has invented a metal bellows forming device with the publication number "CN210907555U". It converts the longitudinal movement of the hydraulic cylinder rod into the lateral movement of each part of the bellows. When each part of the bellows extends into position, the outer diameter of the bellows is larger than the diameter of the bellows fixing seat. Therefore, a corrugation will be stretched at the corresponding position of the thin-walled metal tube fitted on the bellows fixing seat. After one corrugation is formed, the hydraulic cylinder rod returns, and each part of the bellows retracts and resets under the action of the return spring, and the thin-walled metal tube moves down to perform the next corrugation forming.

[0004] The device has a simple structure and is easy to operate, but the following problems exist during use: 1. Relying on manual positioning of the thin-walled metal tube, the expansion flaps are prone to eccentricity during the expansion process, and irregular deformation of the corrugated edges after expansion is also likely; 2. The distance between two adjacent expanded corrugations is difficult to control, affecting product quality. Utility Model Content

[0005] (a) Technical problems to be solved

[0006] To address the shortcomings of existing technologies, this invention provides a metal corrugated pipe bulging device, which solves the aforementioned technical problems.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, this utility model provides the following technical solution: a metal corrugated pipe bulging device, comprising a device body, a boss protruding from the device body, a transmission cavity inside the device body, a rotating disk rotatably mounted inside the transmission cavity, a servo motor mounted at the bottom of the device body, the output shaft of the servo motor mounted at the bottom of the rotating disk, four arc-shaped guide grooves at the top of the rotating disk, four rectangular sliding holes on the inner wall of the top of the transmission cavity, a sliding shaft slidably mounted in the arc-shaped guide grooves, a bulging block mounted at one end of the sliding shaft passing through the rectangular sliding hole, multiple bulging petals protruding from the outer side of the bulging block, two mutually symmetrical connecting blocks mounted on the device body, a hydraulic telescopic cylinder mounted at the end of the connecting block away from the device body, an arc-shaped positioning block mounted on the telescopic rod of the hydraulic telescopic cylinder, and multiple positioning petals protruding from the inner side of both arc-shaped positioning blocks.

[0009] Preferably, the bottom of the device body is provided with four support columns, which are distributed in a matrix at the bottom of the device body.

[0010] Preferably, the top of the sliding shaft is provided with a docking block, the docking block is provided with a T-shaped groove, and the bottom of the bulging block is provided with a T-shaped block that matches the T-shaped groove.

[0011] Preferably, the T-shaped block and the mating block are fixed together by fixing bolts.

[0012] Preferably, the arc-shaped positioning block has a protruding mounting block, and the mounting block has an insertion hole for inserting the telescopic rod. The mounting block and the telescopic rod are connected and fixed by connecting bolts.

[0013] Preferably, a limiting groove is provided on the inner wall of the rectangular sliding hole, and a protruding ring adapted to the limiting groove is provided on the section of the sliding shaft inside the rectangular sliding hole.

[0014] Preferably, the multiple positioning petals on the arc-shaped positioning block and the multiple expansion petals on the expansion block are arranged alternately.

[0015] Compared with the prior art, this utility model provides a metal corrugated tube bulging device with the following advantages: This utility model, through the cooperation of a rotating disk, bulging blocks, and arc-shaped positioning blocks, allows two hydraulic telescopic cylinders to drive two arc-shaped positioning blocks closer together to clamp and fix the thin-walled metal tube during use, eliminating the need for manual handling. A servo motor drives the rotating disk to rotate, and the arc-shaped guide groove and rectangular sliding hole provide dual constraints, causing the four bulging blocks to move away from each other. This accommodates thin-walled metal tubes of different diameters. The bulging petals on the bulging blocks cooperate with the positioning petals on the arc-shaped positioning blocks to achieve the bulging of the thin-walled metal tube. Furthermore, the staggered arrangement of multiple bulging petals and arc-shaped positioning blocks effectively ensures the spacing between adjacent bulging corrugations. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the main structure of this utility model;

[0017] Figure 2 This is a top cross-sectional view of the rotating disk and sliding shaft of this utility model.

[0018] Figure 3 This is a cross-sectional structural diagram of the bulging block and arc-shaped positioning block of this utility model;

[0019] Figure 4 This is a cross-sectional structural diagram of the T-groove and docking block of this utility model.

[0020] The components include: 1. Main body of the device; 2. Support column; 3. Boss; 4. Expansion block; 5. Expansion flap; 6. Connecting block; 7. Arc-shaped positioning block; 8. Hydraulic telescopic cylinder; 9. Mounting block; 10. Connecting bolt; 11. Positioning flap; 12. Rotating disk; 13. Arc-shaped guide groove; 14. Sliding shaft; 15. Telescopic rod; 16. Servo motor; 17. Connecting block; 18. T-slot; 19. Fixing bolt; 20. T-block; 21. Transmission cavity; 22. Rectangular sliding hole; 23. Limiting sliding groove. Detailed Implementation

[0021] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0022] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," 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. In addition, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] Please see Figure 1-4 A metal bellows forming device includes a main body 1, a boss 3 protruding from the main body 1, a transmission cavity 21 inside the main body 1, a rotating disk 12 rotatably mounted inside the transmission cavity 21, a servo motor 16 mounted at the bottom of the main body 1, the output shaft of the servo motor 16 mounted at the bottom of the rotating disk 12, four arc-shaped guide grooves 13 on the top of the rotating disk 12, four rectangular sliding holes 22 on the inner wall of the top of the transmission cavity 21, and a sliding shaft 14 slidably mounted within the arc-shaped guide grooves 13. A bulging block 4 is installed at one end of the sliding shaft 14 that passes through the rectangular sliding hole 22. Multiple bulging petals 5 protrude from the outer side of the bulging block 4. Two symmetrical connecting blocks 6 are installed on the main body 1 of the device. A hydraulic telescopic cylinder 8 is installed at the end of the connecting block 6 away from the main body 1 of the device. An arc-shaped positioning block 7 is installed on the telescopic rod 15 of the hydraulic telescopic cylinder 8. Multiple positioning petals 11 protrude from the inner side of both arc-shaped positioning blocks 7. The multiple positioning petals 11 on the arc-shaped positioning block 7 and the multiple bulging petals 5 on the bulging block 4 are arranged alternately.

[0025] By cooperating with the rotating disk 12, the bulging block 4, and the arc-shaped positioning block 7, the two arc-shaped positioning blocks 7 can be driven by the two hydraulic telescopic cylinders 8 to move closer together and clamp and fix the thin-walled metal tube, thus eliminating the need for manual handling of the thin-walled metal tube. At this time, the rotating disk 12 can be rotated by the servo motor 16, and the four bulging blocks 4 can be moved away from each other by the dual constraints of the arc-shaped guide groove 13 and the rectangular sliding hole 22, which can accommodate thin-walled metal tubes of different diameters. The bulging petals 5 on the bulging block 4 and the positioning petals 11 on the arc-shaped positioning block 7 cooperate to achieve the bulging of the thin-walled metal tube. Due to the staggered arrangement of multiple bulging petals 5 and arc-shaped positioning blocks 7, the spacing between two adjacent bulging corrugations can be well guaranteed.

[0026] Specifically, in this embodiment, four support columns 2 are protruding from the bottom of the device body 1, and the four support columns 2 are distributed in a matrix at the bottom of the device body 1.

[0027] The support column 2 provides stable support for the main body 1 of the device.

[0028] Specifically, in this embodiment, the top of the sliding shaft 14 is provided with a docking block 17, the docking block 17 is provided with a T-shaped groove 18, the bottom of the bulging block 4 is provided with a T-shaped block 20 that is adapted to the T-shaped groove 18, and the T-shaped block 20 and the docking block 17 are connected and fixed by a fixing bolt 19.

[0029] The T-slot 18 and T-block 20 are designed to work together to facilitate quick assembly and disassembly of the expansion block 4, and to facilitate the replacement of expansion blocks 4 of different sizes, so that the device can be adapted to the expansion of metal bellows of different sizes.

[0030] Specifically, in this embodiment, the arc-shaped positioning block 7 is provided with a mounting block 9, and the mounting block 9 is provided with an insertion hole for the telescopic rod 15 to be inserted. The mounting block 9 and the telescopic rod 15 are connected and fixed by a connecting bolt 10.

[0031] The installation block 9 and the connecting bolt 10 work together to facilitate quick assembly and disassembly of the arc-shaped positioning block 7, and to facilitate the replacement of arc-shaped positioning blocks 7 of different sizes, so that the device can be adapted to the expansion of metal bellows of different sizes.

[0032] Specifically, in this embodiment, a limiting groove 23 is provided on the inner wall of the rectangular sliding hole 22, and a protruding ring adapted to the limiting groove 23 is provided on a section of the sliding shaft 14 inside the rectangular sliding hole 22, which can restrict the position of the sliding shaft 14 and limit the range of movement of the sliding shaft 14.

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

Claims

1. A metal bellows expansion device comprising a device body, characterized by: The main body of the device has a protruding boss, and a transmission cavity is formed inside the main body. A rotating disk is rotatably installed in the transmission cavity. A servo motor is installed at the bottom of the main body, and the output shaft of the servo motor is installed at the bottom of the rotating disk. Four arc-shaped guide grooves are formed at the top of the rotating disk. Four rectangular sliding holes are formed on the inner wall of the top of the transmission cavity. A sliding shaft is slidably installed in the arc-shaped guide groove. An expansion block is installed at one end of the sliding shaft that passes through the rectangular sliding hole. Multiple expansion petals protrude from the outer side of the expansion block. Two symmetrical connecting blocks are installed on the main body of the device. A hydraulic telescopic cylinder is installed at the end of the connecting block away from the main body of the device. Arc-shaped positioning blocks are installed on the telescopic rod of the hydraulic telescopic cylinder. Multiple positioning petals protrude from the inner side of both arc-shaped positioning blocks.

2. A metal bellows expansion device as defined in claim 1, wherein: The bottom of the main body of the device is provided with four support columns, which are distributed in a matrix at the bottom of the main body of the device.

3. A metal bellows expansion device as defined in claim 1, wherein: The top of the sliding shaft is provided with a docking block, and a T-shaped groove is provided on the docking block. The bottom of the bulging block is provided with a T-shaped block that matches the T-shaped groove.

4. A metal bellows expansion device as defined in claim 3, wherein: The T-shaped block and the mating block are fixed together by fixing bolts.

5. A metal bellows expansion device as defined in claim 1 wherein: The arc-shaped positioning block has a protruding mounting block, and the mounting block has an insertion hole for inserting the telescopic rod. The mounting block and the telescopic rod are connected and fixed by connecting bolts.

6. A metal bellows expansion device as defined in claim 1, wherein: A limiting groove is provided on the inner wall of the rectangular sliding hole, and a protruding ring that matches the limiting groove is provided on the section of the sliding shaft inside the rectangular sliding hole.

7. A metal bellows expansion device as defined in claim 1 wherein: The multiple positioning petals on the arc-shaped positioning block and the multiple expansion petals on the expansion block are arranged alternately.

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