JPH0758347B2 - Handling device for tubular body for nuclear fuel - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a handling device for automatically transferring a small-diameter long tubular body for nuclear fuel such as a fuel rod and its cladding tube between working processes. .

(Prior Art) A cladding tube that contains a large number of uranium dioxide pellets inside and forms the framework of a fuel rod for a nuclear reactor is generally made of zirconium alloy and has a length of 4 m, a diameter of about 1 cm, and a wall thickness of about 0.6 mm. In order to finish the fuel rod from the cladding tube with a low elongated tube,
End surface processing of cladding tube, b, cleaning of outer surface, c, cleaning of inner surface,
D, Lower end plug welding, E, Pellet insertion, F, Internal gas elimination, G, Internal spring accommodating and upper end plug welding, but the severe quality of fuel assembly parts From the aspect of management, do not deform the pipe body,
As a general rule, not to scratch the inner and outer surfaces, at the present time, as shown in FIG. 5, a dedicated tray t having corrugated cushioning materials C provided at regular intervals on the inner bottom is used, and several trays are used therein. The actual situation is that the covering pipe m is housed and two workers transport it between the processes.

(Problems to be Solved by the Invention) In the above-described conventional method for finishing the fuel rods, the work efficiency is very poor because management is uncertain and the work efficiency is extremely high.

Therefore, it is an object of the present invention to provide a handling device capable of automatically and continuously transferring between steps without damaging or deforming a thin and long tubular body such as a covered tube which is difficult to handle.

(Means for Solving the Problem) In order to achieve the above object, the present invention is, as a handling device for a tubular body for nuclear fuel, firstly, a mounting table having a required height is provided on a base in a predetermined front, rear, left, and right in correspondence with a working process. A plurality of standing shafts are arranged at intervals of, and a rotating shaft is arranged in the center between the left and right mounting bases that form a row in the front-rear direction, and each rotating shaft is positioned in the middle of the front and rear mounting bases of each row, A first pulley non-rotatably provided on the rotary shaft, an arm that rotates together with the rotary shaft, and a first pulley having the same diameter as the first pulley that is rotatably supported at the tip of the arm and has a receiving block mounted on the front surface. A handling member composed of two pulleys and a belt wound around both pulleys is mounted respectively, and the handling member transports the thin and long tubular body onto the table of each row. Numeral 2 is a stand for each row on the base and each rotation axis The whole or upper end of the receiving block on the front surface of the second pulley of the upper handling member is formed of metal or synthetic resin softer than the tubular body, and thirdly, the first pulley and the first pulley of the handling member. It is characterized in that the two pulleys and the belt wound around the two pulleys are a timing pulley and a timing belt each having an uneven surface.

(Operation) When one material tubular body is placed on the table in the first row and the rotary shaft is rotated, the arms of the handling members mounted on the rotary shaft rotate together with the rotary shaft, and accordingly, the arms of the respective arms rotate. The second pulley attached to the tip portion revolves around the rotation axis in the same direction, and at the same time, rotates about the same angle in the opposite direction to keep the receiving block on the front surface always upright. , The receiving block of each handling member of the first rotary shaft adjacent to the mounting table in the first row scoops the tubular body on the mounting table which has been processed in the first stage,
Transfer to the table in the second row. Such an operation is repeated in the order of steps.

Embodiments Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a part of the device of the present invention obliquely, with the front side as the rear and the opposite side as the front. 1a, 1b, 1c ... are fixed heights that are erected in a row on the base 11 at regular intervals in the left-right direction and at predetermined intervals in the front-rear direction, corresponding to the working devices for each process. Is a table having a V-groove at the upper end, and a supply table 12 for the cladding tube m, which is the material, is arranged on the left side of the table 1a in the first row, and is rotated at the center position between the left and right table rows. The shafts 2 are arranged in parallel in parallel to the rows of the mounts, respectively, and are arranged on the base 11 so as to match the positions of the mounts of each row (but the number is not necessarily the same). 3 is rotatably supported, and each of the rotating shafts 2 is provided with the following handling members H at positions corresponding to the middle of the front and rear mounts of each row.

The handling members H are firstly mounted on the rotary shaft 2 through bearings 5a as shown in FIGS. 2 and 3.
The rotating shaft 2 is provided on both the front and rear sides of the pulley 4a and the bearing 5a.
Tubular pieces 6a, 6b screwed to the rear end, an arm member 7 of a fixed length having a base end (upper end in the figure) fitted and fixed to the rear tubular piece 6a, and a tip of the arm member 7. Mounted on the boss shaft 7a
A second pulley 4b having the same diameter as that of the first pulley 4a rotatably provided on the first pulley 4a, 4 through a bearing 5b;
A stay 9a, which is composed of a belt 8 hung between b and is connected to an inverted Z-shaped support rod 9 erected on a base 11 on the front surface of the first pulley 4a attached to the rotary shaft 2. Is fixed, the first pulley 4a is fixed so as not to rotate, and the second pulley 4b is in the first position as shown when not in operation.
A V block 10 having a V groove 10a at the center of the upper end is fixed to the upper half of the front surface of the pulley 4a in an upright state.

The relationship between the V block 10 fixed to the front surface of the second pulley 4b and the stands 1a, 1b, 1c located on the left and right sides of the V block 10 is as follows.
When the second pulley 4b is rotated by the rotation shaft 2 through a desired angle (90 ° and 270 ° in the illustrated example), the V groove 10a on the V block 10 is aligned with the V groove on the upper end of the stand. Further, as shown in FIG. 1, each rotary shaft 2 is intermittently driven by a motor (not shown) connected to a drive shaft 14 installed along a base 11 via a rear transmission mechanism 13 respectively. It is designed so that it is rotated at a constant speed, or is intermittently rotated synchronously by a motor attached to each working device. Further, a metal softer than the material of the cladding tube m such as aluminum or a synthetic resin such as polyethylene is used for the whole or the upper end portion of the V block 10 on the stand 1a, 1b, 1c ... And the second pulley 4b in each row. And again
The first and second pulleys 4a, 4b and the belt 8 are timing pulleys and timing belts having contact surfaces with irregularities as shown in FIG. 4 in order to prevent slippage more reliably. However, this could be something else.

In the operation of the above structure, first of all,
If one of the material cladding tubes m on 12 is manually set on the table 1a in the first row, the first process (for example, end face processing) is performed, and the motor is operated at the end of the process. ,
The rotary shafts 2 rotate in the directions of the solid line arrows in FIG. 2, respectively, and at this time, the first pulley 4a provided on the rotary shaft 2
Does not rotate, and the arm 7 fixed to the tubular piece 6a on the rear side thereof rotates together with the rotating shaft 2, and the rotation of the arm 7 causes the belt 8 to move toward the first pulley 4a as shown in FIG. The length corresponding to the rotation angle is paid out from one side (right side), and at the same time, the other side (left side) is wound by the same length, and the movement of the belt 8 causes the boss shaft 7a at the tip of the arm 7 to move. Second rotatably attached to
The pulley 4b revolves in the same direction as the arm 7, that is, the rotating shaft 2, and rotates in the opposite direction and at the same angle (90 ° in FIG. 4), so that the V block 10 on the second pulley 4b always maintains the upright posture. It will be.

Therefore, when the first rotary shaft 2 adjacent to the table 1a in the first row is rotated by 90 ° from the beginning, the second pulley 4b at the tip of the arm is moved to the table 1a in the first row as indicated by the dotted line in FIG. Overlap with
The V-shaped groove 10a of the V block 10 scoops off the cladding tube m placed on the stand 1a, and when it continues to rotate 270 ° from the beginning, the V block 10 comes to the position of the chain line and the V of the second stand of the stand 1b.
The cladding tube m is transferred to the groove, the arm 7 and the second pulley 4b come to the initial hanging position, and the motor is temporarily stopped.

Thus, the cladding tube m transferred to the table 1b in the second row is subjected to the second step work (outer surface cleaning), while the next cladding tube is placed on the table 1a in the first row. m is placed and the first processing is performed, and when they are finished, the motor is activated, and the cladding tube m on the stand 1b in the second row is the handling member H of the second rotary shaft 2 and is the third. The coating tube m on the table 1c of the first row is moved to the table 1c of the first row, and at the same time, the coating member m on the table 1a of the first row is transferred to the table 1b of the second row by the handling member H of the first rotating shaft 2. By continuing such operations, the material cladding tubes are sequentially finished into fuel rods by automatically passing through the work steps described above.

In addition, although handling of the cladding tube has been described in the above example, the present invention can be applied to the case where the fuel rods are conveyed in stages.

(Effect of the Invention) As described above, the present invention is configured as described above as a device for handling a tubular body for nuclear fuel, so that it is difficult to handle a small-diameter long product that has been manually transported between processes. The tubular body can be automatically and continuously transferred between processes, and the work efficiency is improved. Moreover, the tubular body is received by a block made of a softer material at a plurality of places, and a plurality of blocks made of the same material form a row. Since it is transferred to the table, there is no risk of bending, deforming or scratching the tubular body,
Further, if the first and second pulleys of the handling member and the belt are timing pulleys and timing belts having unevenness on their contact surfaces, mutual slip is effectively prevented,
The handling operation becomes more reliable.

[Brief description of drawings]

FIG. 1 is a perspective view of a part of an embodiment of the present invention. FIG. 2 is a front view taken along the line XX in FIG. FIG. 3 is a sectional view taken along the line YY of FIG. FIG. 4 is a front view showing an operating state of the handling member. FIG. 5 is a perspective view of a conventional transport tray. In the figure, 1a, 1b, 1c ... Stand, 2 ... Rotating shaft, 3 ... Bearing member, 4a ... First pulley, 4b ... Second pulley, 5a, 5b ...
Bearings, 6a, 6b …… Cylindrical piece, 7 …… Arm, 8 ……
Belt, 9 ... Support rod, 10 ... V block, 11 ... Base, 12 ... Supply base, m ... Cladding tube

Claims (3)

[Claims] 1. A plurality of pedestals of a required height are provided on a base at predetermined intervals in front, back, left and right in correspondence with a work process, and a rotary shaft is provided at the center between the left and right pedestals forming a row in the front-rear direction. A first pulley provided non-rotatably on the rotary shaft, an arm rotating with the rotary shaft, and a tip portion of the arm. A second pulley having the same diameter as the first pulley, which is rotatably rotatably supported on the front surface and has a receiving block attached thereto, and a belt wound around both pulleys are mounted on the front surface of the pulley. An apparatus for handling a tubular body for nuclear fuel, characterized in that the tubular body having a long diameter is transferred onto a table in each row. 2. The bases of the respective rows on the base and all or the upper end of the receiving block on the front surface of the second pulley of the handling member on each rotating shaft is made of a metal or synthetic resin softer than the tubular body. The nuclear fuel tubular body handling device according to claim 1. 3. A first pulley and a second pulley of the handling member.
2. The apparatus for handling a nuclear fuel tubular body according to claim 1, wherein the pulley and the belt wound around the pulleys are a timing pulley and a timing belt having contact surfaces with each other.