Clamping device for machining outer diameter of large-diameter pipe

Abstract

The utility model belongs to machining devices, and particularly relates to a clamping device for machining the outer diameter of a large-diameter pipe, which comprises an upper pressing plate, a lower positioning plate and a fastening connecting device, the upper pressing plate and the lower positioning plate are disc-shaped parts, the size of the upper pressing plate and the size of the lower positioning plate are matched with the size of a bushing, and the fastening connecting device is connected with the upper pressing plate and the lower positioning plate. And the fastening connecting device penetrates through the upper pressing plate and the lower positioning plate and fixes the upper pressing plate and the lower positioning plate with the bushing. The bushing clamping device has the advantages that the bushing clamping device is simple, reasonable and compact in design and easy to install, bushing clamping is achieved under the clamping force of the lower positioning plate, the upper pressing plate, the screw and the nut, and the bushing clamping device meets the use requirement after passing actual machining and verification of machined workpieces.

Description

Technical Field

[0001] The invention belongs to a processing device, in particular to a clamping device for processing the outer diameter of a large-diameter pipe. Background Art

[0002] In industrial production, it is necessary to process large-diameter nozzle material liners. The inner lining material is zirconium (R60702). The tube is formed by rolling and welding plates of a certain thickness. After welding, the outer diameter of the rolled liner needs to be processed to meet the assembly requirements with the inner hole of the corresponding nozzle substrate.

[0003] Because the liner is made of 8mm thick plate, formed by rolling and welding, it has a certain degree of ovality. To meet the requirements of the corresponding nozzle assembly, the outer diameter of the formed liner needs to be turned. Due to its thin wall and large diameter, the liner has poor deformation resistance and cannot be directly clamped with a chuck. Clamping during the manufacturing process becomes a problem for processing this type of component.

[0004] Therefore, a clamping device for processing the outer diameter of large-diameter pipes is needed. Utility Model Content

[0005] Aiming at the defects of the prior art, the present invention provides a clamping device for processing the outer diameter of large-diameter pipes.

[0006] The present invention is realized as follows: a clamping device for processing the outer diameter of a large diameter pipe, which includes an upper pressing plate, a lower positioning plate and a fastening connection device, wherein the upper pressing plate and the lower positioning plate are disc-shaped parts, and the size matches the size of the liner. The fastening connection device passes through the upper pressing plate and the lower positioning plate and fixes the upper pressing plate and the lower positioning plate to the liner.

[0007] As described above, a clamping device for processing the outer diameter of a large-diameter pipe, wherein the fastening connection device includes a screw and a nut, wherein the screw is used to penetrate the upper clamping plate and the lower positioning plate, and the nut is used to clamp the upper clamping plate.

[0008] As described above, a clamping device for processing the outer diameter of a large-diameter pipe is provided below the lower positioning plate. The chuck is a circular ring-shaped part, and the size of the hollow part of the chuck matches the size of the lower positioning plate.

[0009] In the clamping device for processing the outer diameter of a large-diameter pipe as described above, the contact end between the upper pressing plate and the liner has an inclined conical surface.

[0010] As described above, a clamping device for processing the outer diameter of a large-diameter pipe, wherein the lower positioning plate has a boss with a stopper at the end that interfaces with the liner, and the outer diameter of the stopper is smaller than the inner diameter of the liner.

[0011] In the clamping device for processing the outer diameter of a large-diameter pipe as described above, the outer diameter of the stopper is 0.1 to 0.2 mm smaller than the inner diameter of the liner.

[0012] The remarkable effects of this new type are: simple, reasonable, compact and easy to install. The liner is clamped under the clamping force of the lower positioning plate, the upper clamping plate, the screw and the nut. Through actual processing and verification of the workpiece after processing, this clamping device meets the use requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is the assembly diagram of "clamping the liner with the clamping device";

[0014] Figure 2 This is the single-piece drawing of the "upper clamping plate";

[0015] Figure 3 This is the single-piece drawing of the "lower positioning plate";

[0016] In the figure: 1. nut, 2. upper clamping plate, 3. bushing, 4. screw, 5. lower positioning plate, 6. chuck. DETAILED DESCRIPTION

[0017] A clamping device for processing the outer diameter of a large-diameter pipe includes a lower positioning plate 5, which is connected to an upper pressing plate 2 by a screw 4 and a nut 1. The liner 3 is clamped between the lower positioning plate 5 and the upper pressing plate 2. The distance between the upper pressing plate 2 and the lower positioning plate 5 is shortened by screwing and tightening the screw 4 and the nut 1, thereby clamping the liner 3 between the two plates. The lower positioning plate 5 is then clamped by a four-jaw chuck 6 to achieve the clamping of the thin-walled liner 3. Figure 1 As shown. The specific structure and working principle of the clamping device are as follows:

[0018] a. The clamping device consists of an upper pressing plate 2, a nut 1, a screw 4, and a lower positioning plate 5. Figure 1 .

[0019] b. The contact end between the upper pressing plate 2 and the liner 3 is a conical surface with a certain slope, which is convenient for rounding the thin-walled liner 3 during the pressing process. There is a through hole in the center that is large enough to facilitate the passage of the screw 4.

[0020] c. In the lower positioning plate 5, the end connecting with the liner 3 is a boss with a stop. The outer diameter of the stop is (0.1~0.2) mm smaller than the inner diameter of the liner 3, which makes it easy for the liner 3 to be installed into the stop, and plays the role of roundness correction and positioning. The center of the lower positioning plate 5 has a thread matching the screw 4, which makes it easy for the screw 4 to be screwed into the lower positioning plate 5.

[0021] d. Install one end of the bushing 3 into the stop boss of the lower positioning plate 5.

[0022] e. Screw the screw 4 into the center threaded hole of the lower positioning plate 5, and pass the screw 4 through the center hole of the upper pressing plate 2, and dock the end with the tapered surface with the bushing 3.

[0023] f. Screw the nut 1 into the screw rod 4. As the nut 1 is gradually screwed in, the upper pressing plate 2 is driven to gradually press the liner 3, so that the liner 3 is clamped into the clamping fixture.

[0024] g. Clamp the clamping tool together with the liner 3 into the vertical lathe chuck 6, and clamp the outer diameter of the lower positioning plate 5 through the chuck 6 to achieve the clamping of the liner 3.

[0025] The usage process of the device in this application is roughly as follows:

[0026] 1. First install the bushing 3 into the stopper of the lower positioning plate 5.

[0027] 2. Insert the screw 4 and screw it into the center threaded hole of the lower positioning plate 5.

[0028] 3. Assemble the upper clamping plate 2 and screw in the nut 1. When the nut 1 and the screw 4 are screwed in and tightened, the upper clamping plate 2 is driven to shorten the distance with the lower positioning plate 5.

[0029] 4. Under the action of the tightening force, the conical surface on the upper clamping plate 2 gradually corrects the roundness of the liner 3 and presses the liner 3 tightly, increasing the friction between the liner 3 and the lower positioning plate 5 and the upper clamping plate 2, thereby achieving the clamping requirements of the liner 3.

[0030] 5. Use the chuck 6 to clamp the outer circle of the lower positioning plate 5, and clamp the liner 3 through the clamping device.

Claims

1. A clamping device for processing the outer diameter of a large-diameter pipe, characterized in that: It comprises an upper pressing plate (2), a lower positioning plate (5) and a fastening connection device, wherein the upper pressing plate (2) and the lower positioning plate (5) are both disc-shaped parts, the size of which matches the size of the liner (3); the fastening connection device passes through the upper pressing plate (2) and the lower positioning plate (5), and fixes the upper pressing plate (2) and the lower positioning plate (5) to the liner (3); The fastening connection device comprises a screw rod (4) and a nut (1), wherein the screw rod (4) is used to penetrate the upper pressing plate (2) and the lower positioning plate (5), and the nut (1) is used to press the upper pressing plate (2); The contact end between the upper pressing plate (2) and the liner (3) is a tapered surface with an inclination.

2. A clamping device for processing the outer diameter of a large-diameter pipe according to claim 1, characterized in that: A chuck (6) is arranged below the lower positioning plate (5). The chuck (6) is a circular ring-shaped part, and the size of the hollow part of the chuck (6) matches the size of the lower positioning plate (5).

3. A clamping device for machining the outer diameter of a large-diameter pipe according to claim 2, characterized in that: In the lower positioning plate (5), the end that butts against the liner (3) is a boss with a stop, and the outer diameter of the stop is smaller than the inner diameter of the liner (3).

4. A clamping device for machining the outer diameter of a large-diameter pipe according to claim 3, characterized in that: The outer diameter of the stop is 0.1 to 0.2 mm smaller than the inner diameter of the liner (3).

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