TWI423266B - Interlinked six-claw griping device - Google Patents

Description

Six-jaw interlocking jaw structure

The invention relates to a six-claw linkage jaw structure, in particular to a tool which can be used for dry storage of used fuel rods in nuclear power plants, and to adjust the centering and the whole circle before welding the upper cover of the sealed steel cylinder, especially to dry storage. A mechanism that can block six paws with radioactive fuel.

The use of nuclear fuel in the sealed steel cylinder, in order to achieve a good dry storage sealing effect, shielding the upper cover sealing system is a very important link, and the gap size distribution between the shield upper cover and the sealing steel cylinder will also affect the sealing welding The result is good or bad. The shield upper cover has a disc shape, a thickness of 178 mm (mm), a diameter of 1663 mm, and a weight of about 3 tons. The sealed steel cylinder is made of stainless steel, and has an outer diameter of 1703 mm, a height of 4835 mm, and a thickness of 16 mm. Because the cylinder shell is limited by the use of rolling and forming, the roundness is difficult to achieve, and because the level is temporarily stored before use, the cylinder mouth is easy to become elliptical, and the cylinder is adjusted to It is quite difficult to have a good roundness in the natural state, and the sealing steel cylinder and the shield upper cover in the sealing steel cylinder loading procedure may have different gaps between the sealing steel cylinder wall and the shielding upper cover. The difficulty of the automatic welding operation is likely to cause defects in the quality of the sealing welding.

After the sealed steel cylinder is filled with fuel under water, the upper cover is shielded and lifted off the water surface for cleaning, draining and sealing welding. According to the previous dry storage sealing steel cylinder and the shield upper cover sealing welding method, the sealing steel cylinder is filled in the gap between the natural and the shielding upper cover with a spacer, and then the automatic welding machine is installed and welded. The detailed operation mode is as follows: :

(1) Before loading the fuel into the sealed steel cylinder, firstly arrange the sealing steel cylinder and the shielding upper cover, and adjust as much as possible to make the gap between the surrounding of the shielding upper cover and the sealing steel cylinder wall uniform;

(2) Set a reference point, measure the surrounding gap and make a record;

(3) Cut the spacers according to the record to make the gap small to the specified extent;

(4) Test confirmation;

(5) The sealed steel cylinder is loaded with fuel and placed on the underwater cover to shield the upper cover;

(6) Sealing the steel cylinder together with the shield cover water;

(7) Put the previously made spacer into the gap that can be placed according to the set reference point;

(8) Use the crane to move the shield cover and hold it against the spacer that has been placed;

(9) put in other spacers;

(10) Welding preparation.

However, since the shield upper cover is placed in the steel cylinder under water, it often causes the circumferential gap of the sealed steel cylinder and the shield upper cover to be different due to the side of the steel cylinder wall when hanging, resulting in increased sealing welding. The difficulty of time. Therefore, the general practitioners cannot meet the needs of the user in actual use.

The main object of the present invention is to overcome the above problems encountered in the prior art and to provide a six-claw interlocking jaw structure for adjusting the center of the heart and the full circle before the welding of the dry-seal sealing steel cylinder and the shield upper cover.

A secondary object of the present invention is to provide a six-pronged mechanism that utilizes dry storage and barrier radioactive fuel.

For the purpose of the above, the present invention is a six-jaw interlocking jaw structure, comprising at least a base and a plurality of interlocking jaws, wherein the upper surface of the base is provided with a plurality of jaw rails and lifting ears. The lower surface is provided with a correction central axis; and each of the linked jaws is mounted on the jaw rail of the base, and each of the linked jaws has an arm integrally formed and contracted to the jaw rail. The front end of the arm is provided with a pressing portion that is firmly abutted against the sealed steel cylinder shell.

In a preferred embodiment, the correction center axis is used as a reference reference axis to correct the center hole of the shield upper cover so that the two can form a concentric circle. When the steel cylinder wall and the shield upper cover require the same clearance during sealing welding, the steel cylinder wall is evenly spread by the interlocking jaws to adjust it to a substantially true circle, and then the gasket is prepared at intervals. The whole circumference is plugged to limit the rebound deformation of the steel cylinder; thereby, the shield upper cover and the sealing steel cylinder reach an approximately concentric circle, and when the structure is removed and the shield upper cover sealing operation is performed, the structure is The influence of geometric external factors can be minimized, and an effective sealing welding can be achieved to function as a barrier to radioactive fuel.

Please refer to FIG. 1 to FIG. 7 , which are respectively a schematic diagram of the structure of the six-claw linkage jaw of the present invention, a schematic diagram of the structure of the sealed steel cylinder used in the present invention, and a side view of the six-claw linkage jaw structure of the present invention. The schematic diagram of the shielded upper cover of the present invention, the schematic diagram of the adjusted roundness of the sealed steel cylinder of the present invention, the schematic diagram of the plugged spacer pattern of the present invention, and the spacer of the present invention are uniformly filled. Schematic diagram of the full circle. As shown in the figure: the invention is a six-claw linkage jaw structure, which is used for adjusting the centering and the full-circle six-claw mechanism before the dry storage and sealing of the steel cylinder and the shield upper cover, so as to achieve rapid adjustment of the sealing steel. The roundness of the cylinder mouth and the work of centering the shield upper cover to improve the quality of the shield upper cover welding. The six-jaw interlocking jaw structure comprises at least a base 1 and a plurality of interlocking jaws 2.

The susceptor 1 mentioned above has a plurality of jaw rails 11 and lifting lugs 12 on the upper surface and a correction central shaft 13 on the lower surface.

In the above-mentioned interlocking jaws 2, each of the interlocking jaws 2 is mounted on the jaw rail 11 of the base 1, and each of the interlocking jaws 2 has an integral shape and is stretched and contracted to the jaw rails. The arm 21 of the elbow 21 is integrally bent into a U-shape, and a yoke portion 22 is formed at the front end to securely abut the sealing steel cylinder casing.

When in use, as shown in FIG. 5, the correction center shaft 13 is engaged with the center hole 41 of the shield upper cover 4, and the interlocking jaws 2 are evenly spread to adjust the casing 3 of the sealing steel cylinder 3 to be adjusted. It is approximately true round and drives the shield upper cover 4 to make it evenly spaced from the cylinder 31 of the steel cylinder 3.

In a preferred embodiment, the sealing steel cylinder 3 is placed under water with a special tool, a used fuel rod is placed in the steel cylinder, and a ring of support rings 32 is welded to the inner circumference of the sealing steel cylinder 3. It is used to support the shield upper cover 4 as shown in Fig. 2. When the shield upper cover 4 is hung to the support ring 32, it is often difficult to align with the steel cylinder 3 due to the easy yaw of the suspension. At this time, the entire steel cylinder 3 is used together with the shield upper cover 4. The special tool is lifted off the water surface, and then the six-claw linkage jaw structure of the present invention is used to align the center, and the correction center axis 13 of the jaw is used as a reference reference axis. As shown in FIG. 3, it is mounted on the shield upper cover 4 The upper center hole 41 is as shown in Fig. 4. The shield upper cover 4 is slightly hoisted by the crane, and the interlocking jaws 2 are opened, so that the interlocking jaws 2 drive the shield upper cover 4 to the center of the sleeve 31 and support the cylindrical shell 31, as shown in Fig. 5, and then Insert the appropriate spacers 5, as shown in Fig. 6, and fill the entire circumference uniformly to limit the rebound deformation of the steel cylinder 3, as shown in Fig. 7, at this time, the shield upper cover 4 and the seal The steel cylinder 3 achieves an approximately concentric circle fit and has an equally spaced circumferential gap, and the six-claw linkage jaw structure of the present invention can be removed for automatic welding operation; thereby, when the shield upper cover sealing operation is performed, the geometry of the structure The influence of external factors can be minimized, which makes the welding arcing convenient, and thus achieves effective sealing welding, so as to play the role of blocking radioactive fuel and solve the problem of insufficient solder yaw filling, so as to further improve the sealing quality.

In summary, the present invention is a six-claw linkage jaw structure, which can effectively improve various disadvantages of the conventional use, can minimize the influence of the geometric external factors of the structure, and make the welding arcing convenient, thereby achieving effective sealing welding. In order to play the role of blocking radioactive fuel and solve the problem of insufficient filling of the solder yoke, to further improve the quality of the sealing, so that the invention can be more advanced, more practical and more suitable for the user. In accordance with the requirements of the invention patent application, the patent application is filed according to law.

However, the above is only the preferred embodiment of the present invention, and the scope of the present invention is not limited thereto; therefore, the simple equivalent changes and modifications made in accordance with the scope of the present invention and the contents of the invention are modified. All should remain within the scope of the invention patent.

1. . . Pedestal

11. . . Pinch guide

12. . . Hanging ear

13. . . Correction center axis

2. . . Linked jaw

twenty one. . . Boom

twenty two. . . Rushing department

3. . . Sealed steel cylinder

31. . . Cylinder

32. . . Support ring

4. . . Shield upper cover

41. . . Center hole

5. . . Spacer

Fig. 1 is a schematic view showing the structure of a six-claw linkage jaw of the present invention.

Fig. 2 is a schematic view showing the structure of a sealed steel cylinder used in the present invention.

Figure 3 is a side elevational view of the six-claw linkage jaw structure of the present invention.

Fig. 4 is a schematic view showing the alignment of the shield upper cover of the present invention.

Fig. 5 is a schematic view showing the adjustment of the true roundness of the sealed steel cylinder of the present invention.

Fig. 6 is a schematic view showing the state of the spacer spacer of the present invention.

Fig. 7 is a schematic view showing the spacer of the present invention in a uniform full-circle pattern.

1. . . Pedestal

11. . . Pinch guide

12. . . Hanging ear

2. . . Linked jaw

twenty one. . . Boom

twenty two. . . Rushing department

Claims (3)

The utility model relates to a six-claw linkage jaw structure, which is used for adjusting a centering and a full-circle six-pronged mechanism before welding of a dry storage sealing steel cylinder and a shield upper cover, comprising: a base having a plurality of clips on the upper surface thereof a claw rail and a lifting lug, the lower surface is provided with a correction center shaft; and a plurality of interlocking jaws, each of which is supported on the jaw rail of the base, and each interlocking jaw has a Forming and expanding telescopically on the arm of the jaw rail, the front end of the arm is provided with a pressing portion that firmly abuts the sealing steel cylinder shell; thereby, the correction central shaft and the shielding upper cover center hole Cooperating, the sealed steel cylinder shell is evenly spread by the interlocking jaws to adjust the approximate true circle and drive the shielding upper cover to make the gap with the steel cylinder shell uniform. According to the six-claw linkage jaw structure described in claim 1, wherein the front ends of the arms of the interlocking jaws are integrally bent into a U-shape. The six-claw linkage jaw structure according to claim 1, wherein the correction center shaft is aligned with the shield upper cover and is mounted on the central hole of the shield upper cover.