A quick clamping device and clamping method for transformer flange

Abstract

The present invention relates to a quick clamping device and a clamping method for a transformer flange, and belongs to the technical field of large-scale power transformer oil tank processing. The technical scheme is: a body (2) comprises a rectangular cylinder (21) and a lower pressing plate (22), the rectangular cylinder (21) is fixed on the lower pressing plate (22) to form a whole, the upper pressing plate (3) is fixed on the rectangular cylinder (21) by a butterfly nut (1) and a bolt (5), a stop cylindrical pin (4) matching the upper pressing plate (3) is provided on the rectangular cylinder (21), a positioning cylindrical pin (6) is provided between the upper pressing plate (3) and the lower pressing plate (22), a pin hole matching the positioning cylindrical pin (6) is provided on the lower pressing plate (22), and the positioning cylindrical pin (6) is fixed on the pin hole of the lower pressing plate (22). The beneficial effects of the present invention are: it can facilitate the connection of the transformer flange, the operation is simple and quick, and the welding spatter is prevented from sticking to the bolt and affecting the disassembly.

Description

Technical Field

[0001] The invention relates to a quick clamping device and a clamping method for a transformer flange, and belongs to the technical field of large-scale power transformer oil tank processing. Background Art

[0002] There are a large number of couplings on the transformer as the passage for oil or gas. The couplings are connected to each other through a pair of flanges, such as Figure 1 , one flange has a sealing groove, and the other flange does not have a sealing groove. The sealing groove is used to install a sealing gasket. For the convenience of description, the two flanges connecting the coupling are hereinafter referred to as flanges. The coupling is generally made by assembly. When piping, the flange is connected and positioned with bolts (with nuts), and then the flange and the coupling are spot welded. When connecting the flanges with bolts, the nuts and bolts need to be screwed together and special tools are required to tighten them, which has low operating efficiency; another function of bolting the flange is to align the flange holes. Due to the large clearance between the bolts and the flange holes, the positioning accuracy of the flange holes is poor, which makes it difficult to assemble the flanges in the future; in addition, for flanges with smaller diameters, since the bolts are close to the coupling, when spot welding the flanges and couplings, the splashes are easy to stick to the threads of the bolts, making it impossible to loosen and remove the nuts on the bolts. The bolts need to be cut off with gas cutting, which seriously affects production efficiency and causes waste of bolts. Summary of the invention

[0003] The purpose of the present invention is to provide a quick clamping device and method for a transformer flange, which is simple and quick to operate, avoids welding spatter from sticking to bolts and affecting disassembly, and solves the problems existing in the background technology.

[0004] The technical solution of the present invention is:

[0005] A quick clamping device for a transformer flange comprises a butterfly nut, a body, an upper pressure plate, a stop cylindrical pin, a bolt and a positioning cylindrical pin. The body comprises a rectangular cylinder and a lower pressure plate. The rectangular cylinder is fixed on the lower pressure plate to form a whole. The upper pressure plate is fixed to the rectangular cylinder by a butterfly nut and a bolt. A stop cylindrical pin matching the upper pressure plate is provided on the rectangular cylinder. A positioning cylindrical pin is provided between the upper pressure plate and the lower pressure plate. A pin hole matching the positioning cylindrical pin is provided on the lower pressure plate. The positioning cylindrical pin is fixed on the pin hole of the lower pressure plate.

[0006] The rectangular cylinder is provided with a blind hole matching with the anti-rotation cylindrical pin, and the anti-rotation cylindrical pin is arranged in the blind hole of the rectangular cylinder.

[0007] The lower pressing plate is rectangular, the upper surface of the rectangular column is higher than the upper surface of the lower pressing plate, and the height difference between the two is 1-2 mm smaller than the thickness of the transformer flange.

[0008] The upper pressing plate and the lower pressing plate are arranged in parallel up and down.

[0009] A quick clamping method for a transformer flange, using the quick clamping device defined above, is performed according to the following steps:

[0010] ① Rotate the upper pressing plate so that it rotates along the bolt until the positioning cylindrical pin between the upper pressing plate and the lower pressing plate is exposed;

[0011] ②Insert the positioning cylindrical pin into the transformer flange hole;

[0012] ③ Rotate the upper pressure plate in the opposite direction so that it presses on the positioning cylindrical pin, and tighten the butterfly nut to achieve quick clamping of the coupling flange.

[0013] The beneficial effects of the present invention are: it can facilitate the connection of the transformer flange, the operation is simple and quick, and the welding spatter is prevented from adhering to the bolts and affecting the disassembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of flange connection of background technology;

[0015] Figure 2 It is an exploded view of the device of the present invention;

[0016] Figure 3 This is a schematic diagram of the present invention in an open state;

[0017] Figure 4 This is a schematic diagram of the closed state of the present invention;

[0018] Figure 5 This is a schematic diagram of the use state of the present invention;

[0019] In the figure: butterfly nut 1, body 2, upper pressure plate 3, anti-rotation cylindrical pin 4, bolt 5, positioning cylindrical pin 6, rectangular cylinder 21, lower pressure plate 22. DETAILED DESCRIPTION

[0020] The present invention will be further described below by way of examples with reference to the accompanying drawings.

[0021] See attached Figures 1 to 5 A quick clamping device for a transformer flange comprises a butterfly nut 1, a body 2, an upper pressure plate 3, a stop cylindrical pin 4, a bolt 5 and a positioning cylindrical pin 6. The body 2 comprises a rectangular cylinder 21 and a lower pressure plate 22. The rectangular cylinder 21 is fixed to the lower pressure plate 22 to form a whole. The upper pressure plate 3 is fixed to the rectangular cylinder 21 by the butterfly nut 1 and the bolt 5. The rectangular cylinder 21 is provided with a stop cylindrical pin 4 that matches the upper pressure plate 3. A positioning cylindrical pin 6 is provided between the upper pressure plate 3 and the lower pressure plate 22. A pin hole matching the positioning cylindrical pin 6 is provided on the lower pressure plate 22. The positioning cylindrical pin 6 is fixed to the pin hole of the lower pressure plate 22.

[0022] In this embodiment, refer to the attached Figures 1 to 5The main body 2 is composed of a rectangular cylinder 21 and a lower pressure plate 22, which is an integral part. The rectangular cylinder 21 is located on the left side of the main body 2 and bears the bending moment and tension during clamping. A vertical through hole is processed on the right side of the rectangular cylinder 21 for passing the bolt 5. A vertical pin hole is processed on the upper side of the left side of the rectangular cylinder 21. The pin hole is a blind hole for installing the anti-rotation cylindrical pin 4. The pin hole and the anti-rotation cylindrical pin 4 have an interference fit. The lower pressure plate 22 is located on the right side of the main body 2. It is a rectangular plate structure for clamping the flange. A vertical pin hole is processed on the right side of the lower pressure plate 22 for installing the positioning cylindrical pin 6. The positioning cylindrical pin 6 is inserted into the pin hole of the lower pressure plate 22 from top to bottom. The lower end of the pin hole is connected to the lower pressure plate 22 by plug welding. The height of the positioning cylindrical pin 6 is 2mm less than the thickness of the flange to avoid affecting the clamping of the flange. The matching accuracy of the positioning cylindrical pin 6 and the flange hole is higher than that of the bolt and the flange hole. Therefore, the positioning accuracy of the positioning cylindrical pin 6 to the flange hole is high. The upper surface of the rectangular cylinder 21 is higher than the upper surface of the lower pressure plate 22 on its right side. The height difference between the two is 1~2mm smaller than the thickness of the flange to ensure the clamping of the flange. The upper pressure plate 3 is located above the main body 2 and is used to clamp the flange. There is a through hole on the left side of the upper pressure plate 3 for the bolt 5 to pass through. The main body 2 and the upper pressure plate 3 are connected by bolts 5. A butterfly nut 1 is installed at the lower end of the bolt 5. By tightening or loosening the butterfly nut 1, the upper pressure plate 3 and the lower pressure plate 22 can clamp or loosen the flange. The upper pressure plate 3 and the main body 2 can rotate relative to each other. When the upper pressure plate 3 rotates clockwise (looking from top to bottom) and reaches the limit of the anti-rotation cylindrical pin 4, the upper pressure plate 3 and the lower pressure plate 22 are 90 degrees. This position state is called the open state. Figure 3 As shown, the clamping device can be removed from the flange in the open state, and can also be installed on the flange; when the upper pressing plate 3 rotates counterclockwise to reach the limit position of the anti-rotation cylindrical pin 4, the upper pressing plate 3 and the lower pressing plate 22 overlap up and down, and this position state is called the closed state of the clamping device, as shown in FIG. Figure 4 As shown, in the closed state, the flange hole is just covered by the upper pressing plate 3 and the lower pressing plate 22, which can prevent welding spatter from entering the hole and affecting the disassembly of the tooling. The distance between the upper pressing plate 3 and the lower pressing plate 22 is slightly larger than the thickness of the flange, and the flange can be quickly clamped by tightening the butterfly nut 1. Since the bolt 5 is away from the coupling pipe, welding spatter can be prevented from sticking to the thread of the bolt. The above device solves the problems existing in bolt-connected flanges, and the operation is simple and quick.

[0023] The method of using the device of the present invention is as follows: the upper pressing plate 3 is rotated 90 degrees clockwise to expose the positioning cylindrical pin 6 between the upper pressing plate 3 and the lower pressing plate 22. Figure 3 Insert the positioning cylindrical pin 6 into the flange hole, and then rotate the upper pressure plate 3 counterclockwise until it overlaps with the lower pressure plate 22, as shown Figure 4 As shown, if the distance between the upper pressing plate 3 and the lower pressing plate 22 is small, the butterfly nut 1 can be loosened appropriately; finally, the butterfly nut 1 is tightened to realize the rapid clamping of the coupling flange, as shown in FIG. Figure 5 shown.

Claims

1. A quick clamping device for a transformer flange, characterized in that: The invention comprises a butterfly nut (1), a body (2), an upper pressure plate (3), a stop cylindrical pin (4), a bolt (5) and a positioning cylindrical pin (6), wherein the body (2) comprises a rectangular cylinder (21) and a lower pressure plate (22), the rectangular cylinder (21) being fixed on the lower pressure plate (22) to form a whole, the upper pressure plate (3) being fixed on the rectangular cylinder (21) by means of the butterfly nut (1) and the bolt (5), the rectangular cylinder (21) being provided with a stop cylindrical pin (4) matching with the upper pressure plate (3), a positioning cylindrical pin (6) being provided between the upper pressure plate (3) and the lower pressure plate (22), and the lower pressure plate (2 2) A pin hole matching the positioning cylindrical pin (6) is provided on the upper plate (22), and the positioning cylindrical pin (6) is fixed on the pin hole of the lower plate (22); the upper plate (3) is rotated 90 degrees clockwise to expose the positioning cylindrical pin (6) between the upper plate (3) and the lower plate (22), and the positioning cylindrical pin (6) is inserted into the flange holes of a pair of connecting pipe flanges, and then the upper plate (3) is rotated counterclockwise until it overlaps with the lower plate (22) up and down. When the distance between the upper plate (3) and the lower plate (22) is small, the butterfly nut (1) can be appropriately loosened; finally, the butterfly nut (1) is tightened to achieve rapid clamping of the pair of connecting pipe flanges.

2. A quick clamping device for transformer flange according to claim 1, characterized in that: The rectangular column (21) is provided with a blind hole matching the anti-rotation cylindrical pin (4), and the anti-rotation cylindrical pin (4) is arranged in the blind hole of the rectangular column (21).

3. The quick clamping device for transformer flange according to claim 1, characterized in that: The lower pressing plate (22) is rectangular, the upper surface of the rectangular column (21) is higher than the upper surface of the lower pressing plate (22), and the height difference between the two is 1-2 mm smaller than the thickness of the transformer flange.

4. The quick clamping device for transformer flange according to claim 1, characterized in that: The upper pressing plate (3) and the lower pressing plate (22) are arranged in parallel up and down.

5. A quick clamping method for a transformer flange, characterized in that: Using the quick clamping device defined in any one of claims 1 to 4, the operation is performed according to the following steps: ① Rotate the upper pressing plate (3) so that the upper pressing plate (3) rotates along the bolt (5) until the positioning cylindrical pin (6) between the upper pressing plate (3) and the lower pressing plate (22) is exposed; ②Insert the positioning cylindrical pin (6) into the flange holes of a pair of union flanges; ③ Rotate the upper pressure plate (3) in the opposite direction so that the upper pressure plate (3) is pressed on the positioning cylindrical pin (6), and tighten the butterfly nut (1) to achieve rapid clamping of a pair of coupling flanges.

Images