CN115816012B - Filling device and filling method for filling a mandrel into a radioactive tube - Google Patents

Abstract

The embodiment of the application relates to metal combined machining, in particular to a filling device and a filling method for filling a mandrel into a radioactive pipe fitting. The filling device comprises: the device comprises a bracket, at least one funnel and at least one elastic piece. At least one first through hole is formed in the support. Each funnel comprises a conical surface section and an outlet section connected with the lower end of the conical surface section, wherein the conical surface section is used for receiving a mandrel to be filled, the inner diameter of the outlet section is larger than the diameter of the mandrel and smaller than the length of the mandrel, so that the mandrel entering the conical surface section can vertically enter a radioactive pipe fitting located below the outlet section along the outlet section, and the outlet section is installed in the first through hole and is configured to be capable of operatively sliding downwards along the first through hole when the mandrel in the conical surface section is retained. Each elastic piece is used for providing upward restoring force for the funnel when one outlet section slides downwards along the first through hole, so that the mandrel retained in the conical surface section can spring up and slide into the outlet section.

Description

Filling device and filling method for filling a mandrel into a radioactive tube

Technical Field

The embodiment of the application relates to metal combined machining, in particular to a filling device and a filling method for filling a mandrel into a radioactive pipe fitting.

Background

Internal pressure testing of radioactive tubing such as cladding tubes is typically performed in a hot room. When the radioactive tube is subjected to an internal pressure test, a mandrel is sometimes required to be filled in the radioactive tube. In the related art, the filling of the mandrel is typically performed by an operator operating a robot outside the hot chamber. In the operation process, the problems of difficulty in alignment, small sizes of the cladding tube and the mandrel, visual angle caused by hot-chamber lead glass and the like exist in the operation of the manipulator, so that the filling process is time-consuming and labor-consuming. In addition, the pipe orifice of the cladding pipe is easy to be broken when the core shaft is filled by the manipulator, and air leakage is easy to occur when the cladding pipe sample is assembled in a sealing way in the later period, so that an internal pressure test is difficult to carry out.

Disclosure of Invention

In view of the above technical problems, embodiments of the present application provide a filling device and a filling method for filling a mandrel into a radioactive tube.

In a first aspect, embodiments of the present application provide a loading device for loading a mandrel into a radioactive tube, comprising:

the bracket is provided with at least one first through hole;

at least one funnel, each funnel comprising a cone section and an outlet section connected to the lower end of the cone section, wherein the cone section is adapted to receive a mandrel to be filled, the inner diameter of the outlet section being greater than the diameter of the mandrel and less than the length of the mandrel, so as to facilitate the mandrel entering the cone section being able to enter the radioactive tube located below the outlet section vertically along the outlet section, the outlet section being mounted in the first through hole and being configured to be able to operably slide down the first through hole when the mandrel in the cone section is retained; and

and at least one elastic piece, wherein each elastic piece is used for providing upward restoring force for the funnel when one outlet section slides downwards along the first through hole, so that the mandrel retained in the conical surface section can spring up and slide into the outlet section.

In a second aspect, embodiments of the present application provide a loading method for loading a mandrel into a radioactive tube, the loading method being achieved with the loading apparatus of the first aspect of the present application, the loading method comprising:

aligning the open end of the radioactive tube below the funnel with the outlet section of the funnel using a first manipulator or clamp;

grabbing the mandrel by using a second manipulator, and placing the mandrel on the conical section of the funnel;

if the mandrel does not enter the outlet section, the funnel is pressed downwards by the second manipulator, and then the second manipulator is separated from the funnel, so that the mandrel is sprung upwards under the action of the restoring force of the elastic piece;

if the mandrel enters the outlet section, finishing the filling operation of the mandrel;

if the mandrel does not enter the outlet section yet, the funnel is pressed downwards again by the second manipulator, so that the mandrel is sprung upwards again under the action of the restoring force of the elastic piece until the mandrel enters the outlet section.

According to the embodiment of the invention, the manipulator only needs to place the mandrel in the conical section of the funnel, and the mandrel can be made to enter the radioactive pipe without directly placing the mandrel in the radioactive pipe with smaller inner diameter. Even though the mandrel is transversely arranged in the conical surface section occasionally to cause that the mandrel cannot slide down smoothly into the outlet section, the manipulator only needs to press the funnel downwards to enable the mandrel to bounce to change the gesture, and because the end part of the mandrel is provided with a chamfer, the mandrel can slide down into the outlet section with high probability under the guiding action of the conical surface section. Therefore, the filling device and the filling method greatly reduce the operation difficulty of the manipulator, and are particularly suitable for filling the core shaft of the pipe fitting such as the cladding pipe in the hot chamber.

Drawings

Other objects and advantages of the present invention will become apparent from the following description of the invention with reference to the accompanying drawings, which provide a thorough understanding of the present invention.

FIG. 1 is a schematic block diagram of a filling device according to one embodiment of the invention;

FIG. 2 is a schematic side view of the filling device shown in FIG. 1;

FIG. 3 is a schematic cross-sectional view of the loading device shown in FIG. 1;

FIG. 4 is a schematic cross-sectional view of the loading device of FIG. 1 at another angle;

fig. 5 is a partial enlarged view of the area a shown in fig. 4;

FIG. 6 is an enlarged view of the funnel of FIG. 5, schematically illustrating a mandrel; and

fig. 7 is a schematic side view of a filling device according to another embodiment of the invention.

It should be noted that the drawings are not necessarily to scale, but are merely shown in a schematic manner that does not affect the reader's understanding.

Reference numerals illustrate:

10. a bracket; 11. a base; 111. a positioning part; 112. a clamping part; 113. a riser; 114. a cross plate; 12. a rotating disc; 121. a center portion; 122. an extension; 1221. a first through hole; 1222. a second through hole; 123. a positioning mating portion; 124. a mounting part; 125. a copper sleeve; 126. a rotation shaft; 127. a bearing seat; 128. a bearing;

20. a funnel; 21. a conical surface section; 22. an outlet section; 221. an outer ring groove; 222. an expansion section; 223. an inner ring groove; 23. a curved surface section;

30. an elastic member;

200. a radioactive tube;

300. and (5) a mandrel.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. It will be apparent that the described embodiments are one embodiment, but not all embodiments, of the present invention. All other embodiments, which can be made by a person skilled in the art without creative efforts, based on the described embodiments of the present invention fall within the protection scope of the present invention.

It is to be noted that unless otherwise defined, technical or scientific terms used herein should be taken in a general sense as understood by one of ordinary skill in the art to which the present invention belongs.

In the description of the embodiments of the present invention, the meaning of "plurality" is at least two, for example, two, three, etc., unless explicitly defined otherwise.

In order to reduce the volume of the cladding tube sample to be filled with a pressure medium when the internal pressure test is performed on the cladding tube sample, a filling mandrel may be provided in the cladding tube. Particularly when the pressure medium is gas, the gas compression ratio is large, so that the amount of gas required in filling is large. After the mandrel occupies a part of the volume in the cladding tube, the using amount of filling gas can be reduced, so that the test is easier to develop and control, and a large amount of pressure medium (gas and liquid) can be prevented from being released into the high-temperature furnace after the cladding tube sample is broken, so that the damage of thermal shock to the high-temperature furnace is reduced.

The mandrel is generally cylindrical. The end of the mandrel is provided with a chamfer, and the circumferential surface of the mandrel is provided with a plurality of grooves parallel to the axis, so that pressure medium can flow conveniently. The inner diameter of the cladding tube is typically small, for example less than 10mm, or around 10 mm. The diameter of the mandrel is slightly smaller than the inside diameter of the cladding tube.

In embodiments of the present application, a plurality of mandrels may be axially loaded into each cladding tube. For example, for a 120mm cladding tube, the interior is filled with approximately 11 mandrels of length 10 mm. For such small-sized mandrels, it is very difficult to directly pack the mandrel into the cladding tube using a robot.

In order to solve the above problems, embodiments of the present application provide a loading device for loading a mandrel into a radioactive tube, which facilitates loading of a small-sized mandrel into the radioactive tube.

Referring to fig. 1 to 5, the loading device includes: a support 10, at least one funnel 20 and at least one elastic member 30.

The bracket 10 is provided with at least one first through hole 1221. The number of first through holes 1221 and the number of funnels 20 are the same. Each funnel 20 is mounted at one of the first through-holes 1221.

In some embodiments, the filling device may include only one funnel 20. In other embodiments, the filling device may include multiple hoppers 20 for filling mandrels 300 of different diameters, respectively. For example, the filling device may include 2, 3, 4, 5, and more hoppers 20.

Each funnel 20 comprises a conical section 21 and an outlet section 22 which meets the lower end of the conical section 21. Wherein the outlet section 22 is mounted in the first through bore 1221. The conical section 21 is intended to receive a mandrel 300 to be filled. The outlet section 22 may be a cylindrical section of uniform inner diameter. The inside diameter of the outlet section 22 is greater than the diameter of the mandrel 300 and less than the length of the mandrel 300 to facilitate the mandrel 300 entering the cone section 21 being able to enter the radioactive tube 200 located below the outlet section 22 upright along the outlet section 22. It will be readily appreciated that the upper end opening of the conical section 21 is larger than the lower end opening. The manipulator only needs to put the mandrel 300 into the funnel 20, and compared with the manipulator which directly loads the mandrel 300 into the radioactive pipe 200, the operation difficulty of the manipulator is greatly reduced in the embodiment of the application.

In the present embodiment, only one mandrel 300 is filled at a time. After the mandrel 300 in the funnel 20 enters the radioactive tube 200, the manipulator places another mandrel 300 into the funnel 20 for further filling.

In some embodiments, the upper end opening of the cone section 21 may be greater than the length of the mandrel 300 to facilitate placement of the mandrel 300 therein by a robot. It will be readily appreciated that when the manipulator places the mandrel 300 into the cone section 21, the mandrel 300 may be laterally positioned within the cone section 21 and not slide down smoothly into the outlet section 22 (i.e., the mandrel 300 remains within the cone section 21).

In the present embodiment, in order to enable the retained mandrel 300 to slide down smoothly into the outlet section 22, in particular, the outlet section 22 is mounted within the first through hole 1221 and is configured to be operable to slide down the first through hole 1221 when the mandrel 300 within the cone section 21 is retained.

Each elastic member 30 is used to provide an upward restoring force to the funnel 20 when one of the outlet sections 22 slides down the first through hole 1221, so that the mandrel 300 retained in the tapered section 21 can be slid into the outlet section 22 after being sprung up to change the posture. The elastic member 30 may be, for example, a spring. In other embodiments, the elastic member 30 may be other conventional structures capable of providing a reverse restoring force.

Specifically, when the mandrel 300 stays in the conical section 21, the manipulator can press down the funnel 20 to enable the outlet section 22 to slide down relative to the first through hole 1221, then the manipulator moves away quickly, the funnel 20 rebounds instantaneously under the action of the elastic member 30, at this time, the mandrel 300 in the funnel 20 is also sprung together, and the sprung mandrel 300 slides down the conical section 21 to the outlet section 22 smoothly with a high probability after changing the posture.

It can be seen that the manipulator in the embodiment of the present invention only needs to place the mandrel 300 in the conical section 21 of the funnel 20, and the mandrel 300 can be introduced into the radioactive tube 200 through the funnel 20 without directly placing the mandrel 300 into the radioactive tube 200 with a smaller inner diameter. Even if the mandrel 300 is accidentally placed in the conical section 21 transversely, so that the mandrel 300 cannot slide down smoothly into the outlet section 22, the mandrel 300 can be sprung up to change the posture only by pressing the funnel 20 by a mechanical arm, and the mandrel 300 can slide down into the outlet section 22 with high probability due to the chamfer at the end of the mandrel 300 and the guiding action of the conical section 21.

Referring to fig. 6, in some embodiments, each funnel 20 further comprises: the curved surface section 23 is connected with the upper end of the conical surface section 21, and the curved surface section 23 is inwards convex along the radial direction. It will be readily understood that "the curved surface section 23 is convex in the radial direction" means that when the upper and lower ends of the curved surface section 23 are connected by a tapered surface, the midpoint of the curved surface section 23 is located inside the tapered surface (i.e., the side closer to the axis). By arranging the funnel 20 to comprise the curved surface section 23 and the conical surface section 21 which are sequentially connected from top to bottom, compared with the situation that the upper part of the outlet section 22 of the funnel 20 is fully arranged to be the conical surface section 21, the curved surface section 23 is more beneficial to keeping the posture that the mandrel 300 slides obliquely and vertically along the conical surface section 21, so that the probability that the mandrel 300 is transversely arranged on the conical surface section 21 is reduced. In other words, the curved section 23 and the tapered section 21 in combination are more advantageous for smooth sliding down of the mandrel 300 to the outlet section 22, reducing the probability of the mandrel 300 being transverse to the tapered section 21.

It is easy to understand that, in the embodiment of the present application, the radially inner surface of the funnel 20 is smooth, and the adjacent two of the curved surface section 23, the conical surface section 21 and the outlet section 22 are in smooth transition connection.

In some embodiments, referring to fig. 5, a copper sleeve 125 is mounted within the first throughbore 1221, and the outlet section 22 of the funnel 20 is slidably disposed within the copper sleeve 125.

Specifically, a lower portion of the first through hole 1221 is formed with a stepped surface over which the copper bush 125 is mounted. The spring (i.e., the elastic member 30) is sleeved on the outlet section 22 of the funnel 20. The bottom of the outlet section 22 of the funnel 20 protrudes downwardly out of the first through hole 1221. Radially outward of the bottom of the outlet section 22 is provided an outer ring groove 221 for mounting a collar (not shown). The collar acts to prevent the funnel 20 from escaping upwardly from the first throughbore 1221 as the funnel 20 moves upwardly under the influence of the spring.

In some embodiments, the bottom of the outlet section 22 is formed with an enlarged section 222 of increased diameter. An outer ring groove 221 is formed radially outward of the expansion section 222. The expansion 222 is configured to receive the upper port of the radiological tubing 200 to facilitate smooth sliding of the mandrel 300 into the radiological tubing 200. The expansion 222 is formed with an inner annular groove 223 on the radially inner side for placing a rubber ring (not shown) so that the upper end of the radioactive tube 200 is clamped by the rubber ring.

In some embodiments, when the number of hoppers 20 is multiple, the inner diameter of the outlet section 22 of each hopper 20 is different for filling mandrels 300 of different diameters, respectively. Since the plurality of hoppers 20 can accommodate different diameter mandrels 300 for filling, filling efficiency is improved.

In some embodiments, for multiple funnels 20, the position of each funnel 20 may remain fixed. In the filling operation, the manipulator is operated at the corresponding hopper 20.

In other embodiments, to facilitate operator viewing from the hot chamber, the position of each funnel 20 may be changed so that the manipulator is always operating at a position that facilitates operator viewing from the hot chamber.

In some embodiments, the bracket 10 may include a base 11 and a rotating disk 12 rotatably disposed on the base 11. A first through hole 1221 is formed in the rotary disk 12, i.e., the hopper 20 is mounted to the rotary disk 12. Since the rotating disc 12 can rotate relative to the base 11, the manipulator can rotate the hopper 20 to be used to an operating position that is convenient for an operator to observe outside the hot chamber when filling.

Referring to fig. 1, the rotating disk 12 may include a central portion 121 and a plurality of extension portions 122 extending outwardly from the central portion 121. Wherein the central portion 121 is rotatably disposed on the base 11, and each of the extending portions 122 is formed with a first through hole 1221. Each funnel 20 is disposed on the extension 122 to facilitate placement of the radiological tubing 200 under the extension 122.

The base 11 may include a vertical plate 113 extending vertically and a horizontal plate 114 extending horizontally from the top end of the vertical plate 113.

The bottom of the center portion 121 may be extended downward with a rotation shaft 126, and the cross plate 114 of the base 11 is provided with a rotation shaft hole, a bearing 128 disposed in the rotation shaft hole, and a bearing housing 127 coaxial with the bearing 128. The rotation shaft 126 is rotatably provided in the bearing housing 127 via a bearing 128.

In some embodiments, a detent arrangement may be provided to ensure that the rotatable disk 12 remains non-rotatable during the priming operation when the desired funnel 20 has been rotated to the operational position. The positioning structure may be a structure commonly known in the art for preventing relative rotation of the two parts, for example by means of a pin and hole cooperation, the rotating disc 12 remaining non-rotatable with respect to the base 11.

In some embodiments, the base 11 is provided with a positioning portion 111. Each extension 122 is further formed with a second through hole 1222, and each extension 122 is provided with a positioning mating portion 123 extending from the second through hole 1222 to below the extension 122. When the rotary disk 12 is rotated to face the positioning engaging portion 123 of one of the extension portions 122 to the positioning portion 111, the positioning engaging portion 123 is operatively engaged with the positioning portion 111 to position the extension portion 122.

In some embodiments, the positioning portion 111 is a snap protrusion; the positioning engaging portion 123 is a clamping groove accordingly. In other embodiments, the positioning portion 111 is a slot; the positioning engaging portion 123 is correspondingly a snap projection.

The extension portion 122 is further provided with a mounting portion 124 and a second elastic member, the mounting portion 124 is fixed to the rotating disk 12, and the positioning portion 111 is rotatably mounted to the mounting portion 124. The second elastic member is used for providing an abutment force for the positioning portion 111.

The second elastic member may be a spring, for example. When the positioning engaging portion 123 is a snap protrusion, the mounting portion 124 and the second elastic member may be similar to a clip structure. When the manipulator rotates the rotating disc 12 to enable any funnel 20 to be located at the operation position, the corresponding positioning and matching part 123 of the funnel 20 can be in positioning and matching with the positioning part 111. At this time, the manipulator toggles the engaging protrusion into the engaging groove to lock the rotating disc 12. When the rotating disc 12 needs to be rotated, the mechanical arm reversely dials the clamping protrusion to separate the clamping protrusion from the clamping groove, so that the rotating disc 12 is unlocked.

The positioning portion 111 may be disposed at a top end of the vertical plate 113 of the base 11. For ease of positioning, the risers 113 are disposed facing the viewing windows of the hot cell, and the width of the risers 113 can be the same as the width of the extensions 122. When the extension 122 is rotated to be substantially aligned with the riser 113, the rotating disk 12 is rotated to a position where the positioning portion 111 can be engaged with the positioning engaging portion 123. With this arrangement, it is possible to facilitate an operator outside the heating chamber to observe whether the rotating disk 12 is rotated to a position where the positioning portion 111 can be engaged with the positioning engaging portion 123.

Referring to fig. 7, in some embodiments, the filling device further comprises: a clamping portion 112 for clamping the radioactive tube 200 to align the open end of the radioactive tube 200 below the rotating disk 12 with the outlet section 22 of the funnel 20.

The clamping portion 112 may be mounted to the base 11.

The clamping portion 112 may be disposed below the positioning portion 111. When the positioning engagement portion 123 and the positioning portion 111 are engaged to position the extension portion 122, the radioactive tube 200 held by the holding portion 112 is coaxial with the corresponding funnel 20. In other words, when the manipulator rotates the rotatable disk 12 to place any of the hoppers 20 in the operating position, the open ends of the radioactive tubes 200 are aligned with the outlet sections 22 of that hopper 20 below the rotatable disk 12.

The gripping portion 112 may be configured to move up and down relative to the base 11 so as to be able to move the open end of the radioactive tube 200 up into the outlet section 22 of the funnel 20 or down out of the outlet section 22.

In other embodiments, the gripping portion 112 may not be provided, and the radioactive tube 200 may be held by another robot or other mating structure.

In the illustrated embodiment, the rotor disk 12 has four extensions 122, and the rotor disk 12 is generally cross-shaped. The number of funnels 20 is four, one funnel 20 being provided on each extension 122. The outlet sections 22 of the four funnels have different inner diameters to meet the filling requirements of the mandrels 300 of the four different diameters. Different symbols may be marked on the corresponding location engaging portion 123 or extension portion 122 of each funnel 20 for distinguishing between different spindle sizes of funnels 20. For example, 1, 2, 3, 4 may be marked on the locating mating portions 123 of each of the four extensions 122, respectively, to distinguish between different spindle sizes of the funnel 20.

From the above, the loading device for loading the mandrel 300 into the radioactive tube 200 according to the present invention can realize the mandrel loading of radioactive tubular samples with different diameters. The curved surface in funnel 20 can smoothly guide mandrel 300 into the radioactive tubular sample, improving the efficiency of mandrel loading. The complex operation of filling the mandrels with different sizes is simplified, and the manual operation workload is reduced. When the situation that the mandrel 300 cannot fall down transversely in the funnel 20 occurs, the mandrel 300 can be reset through the spring under the funnel 20, and the problem that the mandrel 300 is blocked and retained is solved.

Embodiments of the present application also provide a loading method for loading a mandrel 300 into a radioactive tube 200, the loading method being accomplished using the loading apparatus of any of the embodiments of the present application.

The filling method includes the following steps S1 to S5.

S1, the open end of the radioactive tube 200 is aligned with the outlet section 22 of the funnel 20 below the funnel 20 using a first robot or clamp 112.

S2, grabbing the mandrel 300 by using a second manipulator, and placing the mandrel 300 into the conical section 21 of the funnel 20.

S3, if the mandrel 300 does not enter the outlet section 22, the funnel 20 is pressed downwards by the second manipulator, and then the second manipulator is separated from the funnel 20, so that the mandrel 300 is sprung upwards under the action of the restoring force of the elastic piece 30.

S4, if the mandrel 300 enters the outlet section 22, the filling operation of the mandrel 300 is completed.

And S5, if the mandrel 300 does not enter the outlet section 22 yet, the funnel 20 is pressed downwards again by the second manipulator, so that the mandrel 300 is sprung upwards again under the action of the restoring force of the elastic piece 30 until the mandrel 300 enters the outlet section 22.

It will be readily appreciated that after the completion of the filling operation of one mandrel 300, step S2 is repeated until the sum of the lengths of the mandrels 300 filled in the radioactive tube 200 is close to or equal to the length of the radioactive tube 200.

The filling device and the filling method greatly reduce the operation difficulty of the manipulator, and are particularly suitable for filling the mandrel 300 for the pipe fittings such as cladding pipes in a hot room.

It should also be noted that, in the embodiments of the present invention, the features of the embodiments of the present invention and the features of the embodiments of the present invention may be combined with each other to obtain new embodiments without conflict.

The present invention is not limited to the above embodiments, but the scope of the invention is defined by the claims.

Claims (10)

1. A filling method for loading a mandrel into a radioactive tube, the filling method being accomplished with a filling device comprising:

the bracket (10), at least one first through hole (1221) is arranged on the bracket (10);

at least one funnel (20), each funnel (20) comprising a conical section (21) and an outlet section (22) connected to the lower end of the conical section (21), wherein the conical section (21) is adapted to receive a mandrel (300) to be filled, the outlet section (22) having an inner diameter larger than the diameter of the mandrel (300) and smaller than the length of the mandrel (300) so as to facilitate the mandrel (300) entering the conical section (21) being able to enter a radioactive tube (200) located below the outlet section (22) upright along the outlet section (22), the outlet section (22) being mounted within the first through hole (1221) and being configured to be able to slide operatively downwards along the first through hole (1221) when the mandrel (300) within the conical section (21) is retained; and

at least one elastic member (30), each elastic member (30) is used for providing upward restoring force for the funnel (20) when one outlet section (22) slides downwards along the first through hole (1221), so that the mandrel (300) retained in the conical surface section (21) can be sprung up and slide into the outlet section (22);

the filling method is characterized by comprising the following steps:

aligning an open end of the radioactive tube (200) with an outlet section (22) of the funnel (20) below the funnel (20) with a first robot or grip (112);

grabbing a mandrel (300) by using a second manipulator, and placing the mandrel (300) on a conical section (21) of the funnel (20);

if the mandrel (300) does not enter the outlet section (22), the funnel (20) is pressed downwards by the second manipulator, and then the second manipulator is separated from the funnel (20), so that the mandrel (300) is sprung upwards under the action of the restoring force of the elastic piece (30);

-completing the filling operation of the spindle (300) if the spindle (300) enters the outlet section (22);

if the mandrel (300) does not enter the outlet section (22), the funnel (20) is pressed downwards again by the second manipulator, so that the mandrel (300) is sprung upwards again under the action of the restoring force of the elastic piece (30) until the mandrel (300) enters the outlet section (22).

2. The filling method according to claim 1, wherein each funnel (20) further comprises: and the curved surface section (23) is connected with the upper end of the conical surface section (21), and the curved surface section (23) is inwards convex along the radial direction.

3. The filling method according to claim 1, wherein the number of the first through holes (1221) and the funnels (20) is plural, and the inner diameters of the outlet sections (22) of the funnels (20) are different for filling the mandrels (300) of different diameters, respectively.

4. A filling method according to claim 3, characterized in that the bracket (10) comprises a base (11) and a rotating disc (12) rotatably provided on the base (11), the first through hole (1221) being formed on the rotating disc (12).

5. The filling method according to claim 4, wherein the rotating disc (12) includes a central portion (121) and a plurality of extension portions (122) extending outwardly from the central portion (121),

wherein the central portion (121) is rotatably provided on the base (11), and each of the extending portions (122) is formed with one of the first through holes (1221).

6. The filling method according to claim 5, wherein the base (11) is provided with a positioning portion (111),

each extension (122) is further formed with a second through hole (1222), each extension (122) is provided with a positioning engagement portion (123) extending from the second through hole (1222) to the lower side of the extension (122), and when the rotating disc (12) rotates to enable the positioning engagement portion (123) of one extension (122) to face the positioning portion (111), the positioning engagement portion (123) is operatively engaged with the positioning portion (111) to position the extension (122).

7. The filling method according to claim 6, wherein the positioning portion (111) is a snap projection or a snap groove; the positioning matching part (123) is correspondingly a clamping groove or a clamping bulge.

8. The filling method according to claim 6, wherein the extension portion (122) is further provided with a mounting portion (124) and a second elastic member, the positioning portion (111) being rotatably mounted to the mounting portion (124), the second elastic member being for providing an abutment force for the positioning portion (111).

9. The filling method according to claim 6, wherein the filling device further comprises:

-a clamping portion (112) for clamping the radioactive tube (200) to align an open end of the radioactive tube (200) below the rotating disc (12) with an outlet section (22) of the funnel (20).

10. The filling method according to claim 9, wherein the clamping portion (112) is provided below the positioning portion (111),

wherein when the positioning engagement portion (123) and the positioning portion (111) are engaged to position the extension portion (122), the radioactive tube (200) held by the holding portion (112) is coaxial with the corresponding funnel (20).

Images