CN117228334A - Target box conveying device and method after heavy water reactor irradiation - Google Patents

Abstract

The invention relates to the technical field of target box transmission after heavy water pile irradiation, and provides a target box transmission device after heavy water pile irradiation, which aims at solving the problem that the existing transportation channel cannot effectively reduce the radiation to personnel when the radioactive target box is transmitted; the invention also provides a method for transferring the target boxes after the heavy water reactor is irradiated, the target boxes in the vertical section are sequentially arranged at the appointed positions in the shielding transfer container in the shielding box, and the radiation-proof treatment of the target boxes is completed in the shielding box. The irradiated target box is arranged in a shielded working box, and compared with the box transmission, the dosage rate of an operation area and a maintenance area can be reduced from 2msv/h to 25 mu v/h, so that the dosage level of an operator is greatly reduced.

Description

Target box conveying device and method after heavy water reactor irradiation

Technical Field

The invention relates to the technical field of target box transmission after heavy water reactor irradiation, in particular to a device and a method for transmitting a target box after heavy water reactor irradiation.

Background

The neutron flux of the heavy water reactor core is high, and technicians can install an irradiation device at the observation hole of the heavy water reactor for producing medical isotopes and the like. The target box contains the material to be irradiated, and enters the heavy water reactor core through the irradiation device, and is irradiated in the heavy water reactor core. After the irradiation is finished, the irradiation device lifts the target box out of the reactor core, and the target box is discharged from a discharge opening of the irradiation device, and the target box discharged after the irradiation has radioactivity.

Chinese patent CN202210636177.5 (hereinafter referred to as this patent) describes a system and method for producing radioisotopes using heavy water reactor nuclear power stations, in which a design is recommended. In this design, a production channel is installed in the heavy water reactor viewing hole, the production channel is inserted into the heavy water reactor core, and the design provides a channel to and from the heavy water reactor core. The target boxes lifted from the reactor core leave the production channel by utilizing the self gravity to enter an automatic conveying channel, and the automatic conveying channel conveys the target boxes to a position far away from the top of the heavy water reactor.

Clearly, the automated transportation path provided by this patent is large in size. While heavy water reactor tops are provided with a large number of important equipment such as reactor flux measurement mechanisms, shutdown rod drive mechanisms, and tuning rod drive mechanisms, etc., this makes the space available for placement of automated transport channels insufficient for heavy water reactor top locations. Even if the top position of the heavy water reactor is modified, the site modification workload is great due to the limited space. In addition, the automatic transportation channel is required to meet the anti-seismic requirement, the channel path space is narrow, and the basic anchoring of the automatic transportation channel structure is difficult to realize.

And the automatic transport path of this patent transports a magazine in which a radioactive target cartridge is housed. The target boxes discharged from the reactor core are all accommodated in the material boxes to be transported once, the number of single transfer is large, the radioactive dose is high, shielding measures are needed, and the material boxes cannot meet the requirements of size (loading) and shielding at the same time due to limited space. If the loading requirement of the material box is met, the shielding thickness can only be reduced; if the shielding requirement is met, the inner cavity volume cannot meet the loading requirement of the target box due to the large wall thickness of the container, and the material box is heavier, so that the anti-seismic requirement is difficult to meet. The target box is poured into the shielding transfer container from the material box, and the automatic cover closing mechanism completes the cover closing action of the shielding container. In the process of pouring the material box and closing the cover, due to the limited shielding measures, personnel can only remotely operate, and if a fault condition is met, the operators cannot quickly access the material box. In this case, the addition of the temporary shielding measures faces the problem of difficult implementation, and the fault condition cannot be treated quickly and effectively. In addition, because the automatic transportation channel transports the material box, the movement, the lifting and the turning functions of the material box are realized in a small space on site, and the construction difficulty is high.

In addition, in this patent, the cassettes are poured unordered into the shielded container, which is detrimental to the securement of the cassette during transport, such as the securement and removal of the cassette within the shielded container, increasing the complexity of the downstream process.

Disclosure of Invention

The invention mainly aims to provide a target box transmission device and a transmission method after heavy water reactor irradiation, which solve the problem that the existing transportation channel cannot effectively reduce the radiation to personnel when the radioactive target box is transmitted.

The invention further aims to provide a target box conveying device after heavy water pile irradiation, which solves the problem that the existing conveying channel is large in size and difficult to arrange on the top of the heavy water pile.

The invention further aims to provide a target box conveying device after heavy water reactor irradiation, which solves the problem that the existing conveying channel cannot realize the moving, lifting and turning functions of a material box in a narrow space on site.

The invention further aims to provide a target box conveying device after heavy water reactor irradiation, which solves the problem that a material box cannot meet the requirements of size and shielding at the same time.

The invention further aims to provide a target box transmission device after heavy water reactor irradiation, which solves the problem that the fault condition can not be treated rapidly and effectively due to limited shielding measures.

The invention further aims to provide a target box conveying device after heavy water pile irradiation, which solves the problem that the existing conveying channel is difficult to fix in the target box conveying process.

Another object of the present invention is to provide a post-irradiation target box transfer device for heavy water, which solves the problem that the target box is inconvenient to take out in a shielding container and increases the complexity of the downstream process.

The invention further aims to provide a target box conveying device after heavy water reactor irradiation, which solves the problem of disordered loading of the target boxes.

In order to achieve the above object, the present invention provides the following technical solutions:

a heavy water reactor post-irradiation target box transfer device comprising: a transfer tube for receiving the target boxes and passing through the top of the heavy water reactor, the transfer tube having a vertical section, a portion of which is inserted into the shielding box, the vertical section being provided with a separator for allowing the target boxes to enter the shielding box one by one, the transfer tube being provided with a vacuum pump for creating a negative pressure in the transfer tube to suck the target boxes into the vertical section; a shielding transfer container for loading the target box, wherein an inner cover of the shielding transfer container is installed or lifted away through an inner cover lifting appliance installed on the shielding box; and a conveyor belt for transporting the shielded transport container into or out of the shielded enclosure.

As an implementation manner, the separator comprises a target separation cylinder and a bolt connected to the front end of the target separation cylinder, and the target separation cylinder drives the bolt to move.

As an implementation manner, a nozzle is arranged on the vertical section, and the bolt passes in and out of the transmission pipe through the nozzle.

As an embodiment, the transmission pipe is provided with a control ball valve below the mounting position of the separator, and the control ball valve connects the upper part and the lower part of the vertical section into a whole.

As an implementation manner, the control ball valve is provided with a channel with the same inner diameter as the transmission pipe, and when the control ball valve is opened, the control ball valve forms a channel with the transmission pipe so that the target box enters the shielding box through the control ball valve; when the control ball valve is closed, the transfer tube is sealed to create a negative pressure at the inlet of the transfer tube such that the target cartridge enters the vertical section.

As an implementation manner, the transmission pipe is sleeved with a telescopic pipe, the telescopic pipe penetrates into the shielding box, and the telescopic pipe is driven by a telescopic cylinder of the telescopic pipe so that the telescopic pipe moves up and down relative to the transmission pipe.

As an embodiment, the vacuum pump is connected to the vertical section by a line, on which a control valve group is provided.

As an embodiment, the vertical section is inserted vertically into the shielding cage.

As an implementation manner, a counter is sleeved on the vertical section and is used for recording the number of the target boxes entering the vertical section.

As an embodiment, a target box receiving groove is connected to the inlet of the transmission pipe, and the target box receiving groove is used for receiving the target box falling from the discharge opening of the irradiation device.

As an implementation manner, the shape of the target box is cylindrical, and two ends are arc-shaped ends.

As an implementation mode, the shielding box is a box body with lead shielding, two lifting appliance holes and sleeve holes are formed in the top of the shielding box at a certain distance, a pore is formed in the front end of the shielding box to enable the transmission belt to enter and exit the shielding box, and an observation window is formed in the rear end of the shielding box.

As an embodiment, the shielding transfer container includes the inner cap, a basket, and a cylinder, the basket being disposed in the cylinder.

As an implementation manner, the cylinder body is provided with a stepped cylindrical cavity, the inner cover is provided with a stepped cylinder, and the stepped cylinder is matched with the upper part of the stepped cylindrical cavity.

As an implementation manner, the top of the inner cover is provided with an inner cover hole with a step shape, the diameter of an upper hole of the inner cover hole is smaller than that of a lower hole, and the connecting part of the upper hole and the lower hole is provided with an arc-shaped structure.

As an implementation mode, the hanging basket is of a two-layer cake-shaped structure and comprises an upper hanging basket and a lower hanging basket, wherein a plurality of through holes are uniformly arranged in the circumferential direction of the upper hanging basket, a plurality of deep holes are uniformly arranged in the circumferential direction of the lower hanging basket, and the sizes, the number of holes and the distribution intervals of the upper hanging basket and the lower hanging basket are the same.

As an implementation manner, a first operating lever is arranged in the middle of the upper layer hanging basket, the first operating lever is used for downstream process extraction and transportation of the upper layer hanging basket, a second operating lever is arranged in the middle of the lower layer hanging basket, and the second operating lever is used for downstream process extraction and transportation of the lower layer hanging basket.

As an implementation manner, the shielding transfer container further comprises an outer cover, wherein the outer cover is a disc with a hole in the middle and is connected with the cylinder body to limit the inner cover and the hanging basket from moving axially.

As an embodiment, the conveyor belt includes a frame, an intermediate conveying mechanism, and an inner conveying trolley slidably disposed on the intermediate conveying mechanism, and the intermediate conveying mechanism is slidably disposed on the frame.

As an implementation mode, the frame is installed in the shielding box and comprises two C-shaped channel steels which are arranged in parallel relatively and a plurality of transverse supports which are connected between the C-shaped channel steels, one end of the outer side of one C-shaped channel steel is provided with a transmission belt driving motor and a gear box, the other end of the outer side of the C-shaped channel steel is provided with a driven sprocket, and the driven sprocket is connected with a driving sprocket in the gear box through a chain.

As an implementation manner, the driving motor of the transmission belt is connected with a horizontal bevel gear in the gear box through a coupling, the driving sprocket and the vertical bevel gear are arranged on the same shaft, and the vertical bevel gear is meshed with the horizontal bevel gear.

As an implementation mode, the middle conveying mechanism comprises two C-shaped channel steel which are arranged in parallel relatively and a plurality of transverse brackets connected between the two C-shaped channel steel, and rollers are arranged at two ends of the outer side of the C-shaped channel steel of the middle conveying mechanism; one end of the middle conveying mechanism is fixedly connected with the shielding door, the other end of the middle conveying mechanism is installed in C-shaped channel steel of the frame, a stop block is arranged on the inner side of the C-shaped channel steel of the frame, the movement stroke of the middle conveying mechanism is limited, and the middle conveying mechanism is prevented from being separated from the frame.

As an implementation mode, the inner layer conveying trolley comprises two C-shaped channel steel which are arranged in parallel relatively and a plurality of transverse brackets connected between the two C-shaped channel steel, guide wheels are respectively arranged at two ends of the outer side of the C-shaped channel steel of the inner layer conveying trolley, the guide wheels move along the inner side of the C-shaped channel steel of the middle conveying mechanism, two ends of the C-shaped channel steel of the middle conveying mechanism are closed, and the inner layer conveying trolley is limited to be separated from the middle conveying mechanism.

As an implementation mode, a driving plate is arranged on the inner layer conveying trolley, one end of the driving plate is welded on the inner layer conveying trolley, the other end of the driving plate is arranged above the chain, and the driving plate is connected with the chain through a connecting piece.

As an embodiment, the inner layer conveying trolley is provided with a rotary table, and the rotary table carries and rotates the shielding transfer container.

As an embodiment, the turntable comprises a gear disc, a driving wheel and a turntable driving motor, the shielding transfer container is placed on the gear disc, the turntable driving motor is connected with the driving wheel, and the driving wheel is meshed with the gear disc.

As an implementation manner, the device is characterized in that a drag chain is arranged on the transmission belt, one end of the drag chain is fixedly arranged on the frame, and the other end of the drag chain is arranged on the turntable.

As an implementation manner, the conveyor belt is provided with a target box loading position, an inner cover operating position and a shielding transfer container lifting position, when the conveyor belt is positioned at the target box loading position, the shielding door is in a closed state, and the target boxes are loaded into the shielding transfer container one by one; the conveying belt is positioned at the inner cover operation position, the shielding door is in a closed state, and the inner cover lifting tool is used for lifting or loading the inner cover; the transmission belt is positioned at the hoisting position of the shielding transfer container, the shielding door is in an open state, and the shielding transfer container is hoisted in or hoisted out through an external crane.

As an implementation manner, the shielding box is provided with a manual operation hole, a detachable plug is arranged on the manual operation hole, and a rotary tool penetrates through the manual operation hole to drive the conveying belt to the inner cover operation position in a manual driving mode.

As an implementation mode, the inner cover lifting appliance comprises a locking pin, an operating rod, a movable inner rod, an outer cylinder, a guide head and a ball pin, wherein the movable inner rod is arranged in the outer cylinder, a C-shaped groove is formed in the outer cylinder, the operating rod is connected with the movable inner rod through the C-shaped groove, a taper body is arranged at the lower end of the movable inner rod, and the taper body pushes the ball pin to extend out of the guide head.

As an implementation manner, three spherical holes are formed in the middle section of the guide head along the circumferential radial direction, and three spherical pins are arranged in the spherical holes.

As an implementation manner, the inner cover lifting appliance further comprises a lifting ring, and the lifting ring is in threaded connection with the sealing cover at the upper end of the outer cylinder.

As an implementation manner, the inner cover lifting appliance is lifted by a crane outside the shielding box.

As an implementation manner, a gamma probe and a camera are installed in the shielding box.

A method for transporting a target box after heavy water reactor irradiation, comprising: a negative pressure environment is established in the transmission pipe, and the target boxes are sequentially sucked into the vertical section of the transmission pipe from the inlet of the transmission pipe; sequentially loading the target boxes in the vertical section into specified positions in a shielding transfer container in a shielding box; after the shielding transfer container is filled, an inner cover is arranged in the shielding box, and an outer cover is arranged outside the shielding box.

Further, the method for transferring the target box after the irradiation of the heavy water pile specifically comprises the following steps:

step 1: establishing negative pressure in the transmission pipe, and transmitting the target box to the vertical section from a target box receiving groove in a negative pressure mode;

Step 2: opening a shielding door, placing the shielding transfer container on a turntable of an inner layer conveying trolley, and removing the outer cover;

step 3: the inner layer conveying trolley moves the shielding transfer container to an inner cover operation position, an inner cover tool lifts the inner cover, the inner layer conveying trolley moves the shielding transfer container to a target box loading position, and the shielding door is closed;

step 4: sequentially loading the target boxes in the vertical section into holes of hanging baskets in the shielding transfer container;

step 5: mounting the inner lid to the top of the shielded transport container in the shielded enclosure;

step 6: transporting the shielding transfer container out of the shielding box through a transmission belt, and mounting the outer cover on the shielding transfer container;

step 7: and transporting the shielding transfer container to a designated position.

Further, step 1 includes:

closing the control ball valve, withdrawing the plug pin of the separator, and starting the vacuum pump;

as the carts move within the production tunnel, the cassettes are sucked into the vertical section one by one, and a counter counts the cassettes entering the vertical section.

Further, step 2 includes:

the inner layer conveying trolley is moved to a hoisting position of the shielding transfer container by a conveying belt driving motor;

And placing the shielding transfer container on the turntable of the inner layer conveying trolley by a factory crane, and removing the outer cover.

Further, step 3 includes:

the inner layer conveying trolley is moved to an inner cover operation position by a conveying belt driving motor, the inner cover tool is inserted into a hole of the inner cover by a crane, the inner cover lifting tool is locked with the inner cover after the inner cover tool is in place, a locking pin is inserted, and the inner cover is lifted off the shielding transfer container to a preset height;

and the conveyor belt driving motor moves the inner layer conveying trolley to a target box loading position, and the shielding door is closed.

Further, step 4 includes:

driving a telescopic cylinder of the telescopic pipe to descend the telescopic pipe to a preset position above the hanging basket;

the rotary table driving motor rotates the shielding transfer container to enable one hole of the hanging basket to be axially aligned with the telescopic sleeve;

the target piece separating cylinder drives a bolt to be inserted between the two target boxes;

opening a control ball valve, wherein the target box falls into the hanging basket hole by gravity;

closing the control ball valve, withdrawing the plug pin, enabling the next target box to fall to the position above the control ball valve, and then inserting the plug pin;

The turntable driving motor rotates the shielding transfer container to the next empty position of the hanging basket and aligns the telescopic sleeve;

repeating the above operation, and loading all target boxes into the holes of the hanging basket.

Further, step 5 includes:

driving a telescopic cylinder of the telescopic pipe to lift the telescopic pipe to a preset position;

a conveyor belt driving motor moves the inner layer conveying trolley to the inner cover operation position;

and operating an inner cover lifting appliance, installing the inner cover on the shielding transfer container, unlocking the inner cover lifting appliance, and lifting to a preset position.

Further, step 6 includes:

the inner layer conveying trolley is moved to a shielding container hoisting position by a conveying belt driving motor;

the outer cover is mounted on the shielded transport container.

Compared with the prior art, the irradiation target box transmission device and method provided by the invention have the following beneficial effects:

the irradiated target box is arranged in a shielded working box, and compared with the box transmission, the dosage rate of an operation area and a maintenance area can be reduced from 2msv/h to 25 mu v/h, so that the dosage level of an operator is greatly reduced.

The invention adopts the vacuum pump to establish the gas flow direction, which is more beneficial to the suction and the transmission of the target box into the transmission pipe.

The invention adopts gas drive to transmit through the transmission pipe, which is beneficial to the equipment arrangement in the limited space of the site.

The anchoring of the transmission pipe is simpler and the anti-seismic requirement is easier to meet.

The transmission pipe is light in weight and small in size, does not adversely affect surrounding equipment during construction and operation, and has low risk of damaging the surrounding equipment.

The invention can realize the decay of the target box in the vertical section of the transmission pipe and reduce the radioactivity level of the shielding transfer container.

The invention realizes single unloading of the target box and can flexibly unload according to downstream demand conditions. The invention realizes that the target boxes can be packaged and transported according to the requirements after being stacked out, and can realize that different types of isotopes can be produced in the same irradiation channel.

Further, the target box receiving groove provided by the invention can ensure the correct direction when the target box falls.

Furthermore, the target box can be orderly placed into the hanging basket, so that the difficulty of downstream processes is reduced.

Furthermore, the shielding door and the transmission belt are connected together, the shielding door is closed and mechanically interlocked with the fuel unloading operation, so that the shielding door is in a closed state at any time when the radioactive target box is operated in the shielding box, personnel are prevented from receiving accidental irradiation, and intrinsic safety is realized.

Drawings

In order to more clearly illustrate the technical solution of the present invention, the drawings used in the description will be briefly described below.

FIG. 1 is a schematic diagram of a post-irradiation target cassette transfer device after unloading a target cassette provided by the invention;

FIG. 2 is a schematic view of a cassette entering a cassette receiving bay provided by the present invention;

FIG. 3 is a schematic view of a target case according to the present invention;

FIG. 4 is a schematic structural view of a post-irradiation target box transfer device with a shielding door closed according to the present invention;

FIG. 5 is a left side view of the post-irradiation cassette transport apparatus without a shield door provided by the present invention;

FIG. 6 is an enlarged view of FIG. 4 at A;

fig. 7 is a schematic structural view of a post-irradiation target box conveying device in a state that a shielding door is opened;

fig. 8 is a schematic view of a structure of a conveyor belt in an extended state according to the present invention;

FIG. 9 is a schematic view of a conveyor belt according to the present invention in a retracted state;

FIG. 10 is a schematic view of the structure of the transmission belt gearbox provided by the invention, wherein the cross section shows the internal structure of the gearbox;

FIG. 11 is a schematic diagram of a turntable according to the present invention;

FIG. 12 is a top view of a turntable provided by the present invention;

FIG. 13 is a schematic structural view of an upper basket according to the present invention;

fig. 14 is a schematic structural view of the inner cover hanger provided by the present invention;

FIG. 15 is a front view of the inner cover hanger provided by the present invention;

FIG. 16 is a cross-sectional view taken along the B-B plane in FIG. 15;

fig. 17 is a top view of the inner cover hanger provided by the invention.

Reference numerals illustrate:

1. an irradiation device; 2. a discharge port; 3. a target box; 4. a target box receiving groove; 5. a transmission tube; 6. a shielding box; 7. a separator; 8. a vacuum pump; 9. a control valve group; 10. a telescoping tube; 11. controlling a ball valve; 12. a counter; 13. a shielding door; 14. shielding the transport container; 15. a transmission belt; 16. an inner cover; 17. an inner cover lifting appliance; 18. a hanging basket; 19. a frame; 20. an intermediate conveying mechanism; 21. an inner layer conveying trolley; 22. a driving plate; 23. a driven sprocket; 24. a conveyor belt driving motor; 25. a gear box; 26. an observation window; 27. a gamma probe; 28. a camera; 29. a turntable; 30. a gear plate; 31. a driving wheel; 32. a turntable driving motor; 33. a coupling; 34. a horizontal bevel gear; 35. a drag chain; 36. a crane; 38. a cylinder; 39. an outer cover; 40. a hanging ring; 41. a locking pin; 42. a joystick; 43. a movable inner rod; 44. an outer cylinder; 45. a guide head; 46. ball pins; 47. a chain; 48. a drive sprocket; 49. a plug; 50. a lower layer hanging basket; 51. an upper layer hanging basket; 52. a telescopic tube telescopic cylinder; 53. a target separation cylinder; 54. a roller; 55. and a guide wheel.

Detailed Description

Further details are provided below with reference to the specific embodiments.

For ease of understanding, a brief description of the prior art irradiation device 1 will be provided. As shown in fig. 1, the irradiation device 1 is provided with a discharge opening 2, and after the irradiation of the target cassette 3 is completed, the irradiation device 1 lifts the target cassette 3 out of the core and discharges the target cassette from the discharge opening 2.

As shown in fig. 1 to 17, the present invention provides a post-heavy water reactor irradiated target cassette transfer loading apparatus comprising a target cassette receiving bay 4, a transfer pipe 5, a shield box 6, a separator 7, a shield transfer container 14, a transfer belt 15, and an inner lid hanger 17.

As shown in fig. 1 to 3, the cassette receiving bay 4 is mated with the discharge port 2 of the irradiation apparatus 1. The irradiated target cassette 3 falls down from the discharge opening 2 by gravity, and the target cassette 3 falls down into the target cassette receiving bay 4. The transfer tube 5 is connected to the cassette receiving bay 4, and the cassette receiving bay 4 and a portion of the transfer tube 5 are located near the top view port of the heavy water pile.

As shown in fig. 2, the cross section of the target box receiving groove 4 is in a specially designed arc shape, the cross section of the target box receiving groove 4 is in a U shape or approximately in a U shape, the upper part is wide, the lower part is narrow, and both sides are in smooth curve transition, so that the target box 3 can slide along the direction of the target box receiving groove 4 along the axial direction when entering the bottom of the target box receiving groove 4. The cross-sectional shape of the cassette receiving bay 4 is not limited to a U-shape, such as a semicircle or a half-circle So long as it is achieved that the target cartridges 3 are axially parallel when entering the bottom of the target cartridge receiving slots 4.

The cassette receiving bay 4 is arranged directly below the discharge opening 2 and is inclined downwardly so that the cassette 3 can slide to the entrance of the transfer tube 5 by gravity alone, for example, as shown in fig. 1, the cassette receiving bay 4 is located lower away from the discharge opening 2. The lower end of the target box receiving groove 4 is connected with a transmission pipe 5, when the target box 3 falls into the target box receiving groove 4 by gravity, the target box 3 is limited by the shape of the target box receiving groove 4, the target box 3 is in the direction shown in fig. 1, and the end part of the target box 3 is opposite to the inlet of the transmission pipe 5.

As shown in fig. 3, the shape of the target box 3 is cylindrical, the end part is arc-shaped, and the arc-shaped end part is more beneficial to the transportation of the target box 3 in the transportation pipe 5. As shown in fig. 4 and 6, the end edges of two adjacent cassettes 3 have a gap, so that the pins of the separator 7 are inserted between the two adjacent cassettes 3 to separate them.

One end of the transfer tube 5 is connected to the target box receiving groove 4, and the other end of the transfer tube 5 is connected to the shield box 6. The transmission pipe 5 needs to pass through the heavy water pile top equipment area (the area is provided with more equipment and has narrow space), the length is determined according to the direct distance between the irradiation device 1 and the shielding box 6, the pipeline shape, the anchoring and the like of the transmission pipe 5 are determined according to the situation of the heavy water pile top, the arrangement of the transmission pipe 5 has great flexibility, and the device is suitable for the limited space of the heavy water pile top. The transmission pipe 5 is flexibly arranged for necessary turning, climbing and the like according to the actual situation of the site. The trend of the transmission pipe 5 is as follows: beginning at the cassette receiving bay 4 and ending at the telescoping tube 10. The inner diameter of the telescopic tube 10 is slightly larger than the outer diameter of the transmission tube 5, one end of the telescopic tube 10 is sleeved outside the transmission tube 5, the other end of the telescopic tube 10 is inserted into the shielding box 6, and the telescopic tube 10 can slide up and down along the transmission tube 5.

The transfer tube 5 enters the shielding cage 6 from the top. As shown in fig. 4, a section of the transfer tube 5 entering the shielding box 6, which section is called a vertical section, is perpendicular to the shielding box 6, and the vertical section can temporarily place a plurality of target cartridges 3.

The vertical section of the transmission pipe 5 is externally provided with a shielding body with a certain thickness, so that the nuclide with a short half-life in the target box 3 decays in a short time, the surface radioactivity level of the shielding transport container 14 is reduced, and the dosage of staff is reduced.

Through the flexible arrangement of the transmission pipe 5, the shielding box 6 can be arranged at a position far away from the top of the heavy water reactor, and is not limited by space, so that the arrangement of the shielding box 6 is facilitated, and the loading operation of the target box 3 is facilitated.

As shown in fig. 4 and 5, the vacuum pump 8 and the control valve block 9 are connected to the vertical section of the transfer pipe 5 by pipelines, one end of the control valve block 9 is connected to the outlet pipeline of the vacuum pump 8, and the other end is connected to the transfer pipe 5. The vacuum pump 8 generates a sub-atmospheric pressure, and the negative pressure and flow rate are regulated by the control valve group 9.

As shown in fig. 4, the control ball valve 11 is connected to the transfer pipe 5 at both ends, the vertical section of the transfer pipe 5 is of a segment structure, the upper and lower parts of the vertical section are connected together by the control ball valve 11, the transfer pipe 5 (upper pipeline) above the control ball valve 11 is used for temporarily storing a plurality of target cartridges 3, and the transfer pipe 5 (lower pipeline) below the control ball valve 11 is connected to the telescopic pipe 10. The upper pipeline of the control ball valve 11 is provided with a separator 7, and the lower pipeline is provided with a telescopic sleeve 10. The ball valve 11 is controlled to be opened, a channel with the same inner diameter as the transmission pipe 5 is formed in the ball valve, the target box 3 enters the shielding box 6 through the ball valve, the valve core of the ball valve 11 is in a spherical structure, the ball body is provided with a through hole, and when the ball valve is opened, the axis of the through hole coincides with the axis of the ball valve, and the channel is formed. The ball valve 11 is controlled to be closed, so that the transmission pipe 5 is closed, negative pressure is formed at the inlet of the transmission pipe 5, and the target box 3 enters the vertical section of the transmission pipe 5.

The telescopic sleeve 10 is coaxial with the transmission pipe 5, sleeved outside the transmission pipe 5 and extends into the shielding box 6. The telescopic tube 10 is driven by a telescopic tube telescopic cylinder 52, and the telescopic tube 10 moves up and down relative to the transfer tube 5. Typically, the telescoping tube 10 is in the raised position, avoiding interference with the shielded transport container 14. When the target box 3 needs to be loaded, the shielding transfer container 14 is first moved to the shielding transfer container lifting position, the telescopic tube 10 is lowered, and the holes of the hanging basket 18 are aligned. The target cartridge 3 falls into the bore of the basket 18 through the transfer tube 5 and the telescopic tube 10. When the loading of the target cassette 3 is completed, the telescopic tube 10 is lifted again, allowing the shield transfer container 14 to move to the inner lid operating position.

Preferably, the control ball valve 11 is an electrically controlled ball valve.

As shown in fig. 4 and 6, a nozzle is provided on the transfer pipe 5 outside the shielding box 6, and a separator 7 is connected to the nozzle of the transfer pipe 5. The separator 7 is a cylinder with a latch, and includes a target separation cylinder 53 and a latch connected to the front end of the target separation cylinder 53. The pin is inserted into the nozzle, and the target separation cylinder 53 drives the pin to move, and the pin is introduced into and discharged from the transfer tube 5 through the nozzle. The nozzle is disposed at a position near the upper portion of the control ball valve 11 so that the separator 7 is installed at a position near the upper portion of the control ball valve 11. The pin of the separator 7 can be radially inserted into the transmission pipe 5 to separate two adjacent target boxes 3, so that the target boxes 3 can be loaded one by one.

As shown in fig. 4, the counter 12 is sleeved outside the transfer tube 5 and positioned at the upper part of the vertical section of the transfer tube 5, and when the target box 3 passes the counter 12, the counting is triggered. The counter 12 is used to record the number of cassettes 3 entering the vertical section of the transfer tube 5.

A negative pressure loop is formed by the vacuum pump 8, the control ball valve 11 (when closed) and the transmission pipe 5, and a negative pressure area is formed at the inlet of the transmission pipe 5. The target box 3 falling down from the discharge opening 2 is sucked into the vertical section of the transfer tube 5 by the combined action of the kinetic energy of the falling down itself and the negative pressure generated by the vacuum pump 8. The negative pressure loop established by the invention has small volume (the inner diameter of the transmission pipe 5 is smaller, and compared with the whole shielding box, the negative pressure loop has small volume), the time for forming the negative pressure is short, and the smooth suction of the target box 3 into the transmission pipe 5 is ensured. The vertical section of the transfer tube 5 enables the placement of multiple cassettes 3, when needed, one by one, with loading flexibility.

As shown in fig. 4, 5 and 7, the shielding case 6 is a case with lead shielding, and the case is of a rectangular parallelepiped structure as a whole. The box top is opened there are two hoist holes and the sleeve pipe hole of certain interval, and hoist hole is closer to shielding case 6's front end for the sleeve pipe hole, and hoist hole and sleeve pipe hole's interval distance can be adjusted according to actual conditions, and inner cup hoist 17 and telescopic tube 10 pass hoist hole and sleeve pipe hole respectively and get into the box. The rear end portion of the shield case 6 is perforated to mount the observation window 26. The operator views the operation of the equipment in the housing through the viewing window 26. The front end of the shielding box 6 is provided with a duct which is a passage for the transmission belt 15 and the shielding transfer container 14 to enter and exit the shielding box 6, and the duct is blocked by the shielding door 13. The left side in fig. 4 is the front end of the shield case 6, and the right side is the rear end of the shield case 6.

Preferably, the aperture is a rectangular aperture and the viewing window 26 is a lead glass viewing window.

As shown in fig. 4, 5 and 7, the shielding box 6 is provided with a conveyor belt 15, a turntable 29, an inner cover hanger 17 and a telescopic tube 10. The shielding case 6 is also provided with auxiliary components such as a gamma probe 27, a camera 28, a lighting tool, and the like.

The conveyor 15 has three positions, namely, a target box loading position (the position shown in fig. 4), an inner lid operating position (the position immediately below the inner lid hanger 17), and a shielding transfer container hanging position (the position shown in fig. 7). The conveyor belt 15 is located at a cassette loading position where the shield doors 13 are in a closed state, and the cassettes 3 are loaded one by one into the baskets 18 of the shield transport container 14. The conveyor 15 is in the lid operating position with the shield door 13 in a closed position and the lid spreader 17 is suspended from, and lifted off or loaded into, the lid 16 of the shield transport container 14 using the crane 36 outside the shield box 6. The conveyor belt 15 is located at a shielding transfer container lifting position, the shielding door 13 is in an open state, and the shielding transfer container 14 is lifted into or away from the inner layer conveying trolley 21 by an external crane.

As shown in fig. 8 to 10, the conveyor belt 15 is a telescopic conveyor belt, and the conveyor belt 15 includes a frame 19, an intermediate conveyor mechanism 20, an inner conveyor carriage 21, a drive plate 22, a driven sprocket 23, a conveyor belt drive motor 24, a gear box 25, rollers 54, guide wheels 55, and a shield door 13.

The frame 19 is fixedly arranged in the box body of the shielding box 6, and the frame 19 comprises two C-shaped channel steels which are arranged in parallel relatively and a plurality of transverse brackets connected between the two C-shaped channel steels. One end of the outer side of one C-shaped channel steel is provided with a gear box 25 and a driving sprocket 48 of the transmission belt 15, the other end of the outer side of the C-shaped channel steel is provided with a driven sprocket 23, and a chain 47 is connected with the driving sprocket 48 and the driven sprocket 23.

The intermediate conveyor 20 comprises two opposed parallel arranged C-channels, a number of transverse brackets connected between the two C-channels. The distance between the two C-channels of the intermediate conveyor 20 is smaller than the distance between the two C-channels of the frame 19 so that the intermediate conveyor 20 can move between the two C-channels of the frame 19. Two rollers 54 are mounted at each end of the outer side of the C-channel. One end of the middle conveying mechanism 20 is fixedly connected with the shielding door 13, and the other end of the middle conveying mechanism is arranged in C-shaped channel steel of the frame 19. The rollers 54 of the intermediate conveyor 20 move inside the C-channel of the frame 19. The inner side of the C-shaped channel steel of the frame 19 is provided with a stop block for limiting the moving stroke of the intermediate conveying mechanism 20 and preventing the intermediate conveying mechanism 20 from being separated from the frame 19.

The inner layer conveying trolley 21 comprises two C-shaped channel steel which are arranged in parallel relatively and a plurality of transverse brackets connected between the two C-shaped channel steel. The distance between the two C-shaped channels of the inner conveyor car 21 is smaller than the distance between the two C-shaped channels of the intermediate conveyor 20 so that the inner conveyor car 21 can move between the two C-shaped channels of the intermediate conveyor 20. Two guide wheels 55 are respectively arranged at two ends of the outer side of the C-shaped channel steel of the inner layer conveying trolley 21, the guide wheels 55 move along the inner side of the C-shaped channel steel of the middle conveying mechanism 20, two ends of the C-shaped channel steel of the middle conveying mechanism 20 are closed, and the inner layer conveying trolley 21 is limited to be separated from the middle conveying mechanism 20. The driving plate 22 is mounted on the inner layer conveying trolley 21, the driving plate 22 is a metal sheet, one end of the driving plate 22 is welded on the inner layer conveying trolley 21, the other end of the driving plate is overhanging above the chain 47, 2 holes are formed, and the driving plate is connected with the chain 47 through connecting pieces (such as screws, bolts and the like). The drive plate 22 transmits the driving force of the conveyor belt drive motor 24 to the inner layer conveyance carriage 21 by the chain 47, and effects opening and retraction of the conveyor belt 15. The chain 47 drives the inner conveyor carriage 21 to reciprocate along the frame 19 and the intermediate conveyor mechanism 20.

As shown in fig. 8 to 10, the belt drive motor 24 is connected to the horizontal bevel gear 34 via the coupling 33, the horizontal bevel gear 34 is connected to the vertical bevel gear, the vertical bevel gear is fixedly connected to the drive sprocket 48 on the same shaft, and the drive sprocket 48 and the driven sprocket 23 are connected via the chain 47. The conveyor belt driving motor 24, the horizontal bevel gear 34, the vertical bevel gear, the driving sprocket 48, and the driven sprocket 23 are drivingly connected such that the conveyor belt driving motor 24 drives the inner conveyor trolley 21 and the intermediate conveyor mechanism 20 in motion. The driven sprocket 23 is mounted on the outer side of the frame 19, the gear box 25 with the drive sprocket 48 is mounted on the outer end of the frame 19, and the chain 47 is fixedly connected to the drive plate 22.

The inner layer conveying trolley 21 moves along the intermediate conveying mechanism 20 under the action of the chain 47, and when the inner layer conveying trolley moves to the end position of the C-shaped channel steel of the intermediate conveying mechanism 20, the inner layer conveying trolley 21 is limited in movement of the intermediate conveying mechanism 20, and the inner layer conveying trolley 21 drives the intermediate conveying mechanism 20 to move along the frame 19 together.

As shown in fig. 7, a turntable 29 is fixedly installed on the inner layer conveying trolley 21, and a shielding transfer container 14 is placed on the turntable 29. The top of the shielding box 6 is provided with a manual operation hole which is closed by a plug 49. The conveyor belt driving motor 24 is disposed inside the shielding case 6, and if the conveyor belt driving motor 24 fails, a plug 49 at the top of the shielding case 6 is removed, a rotary tool is inserted from a manual operation hole, the conveyor belt 15 is manually driven to an inner cap operation position, the inner cap 16 is attached, and then the failure processing is performed.

As shown in fig. 3, 5, 7, and 11 to 13, the turntable 29 is fixedly mounted on the inner layer conveyance carriage 21. The turntable 29 comprises a gear disc 30 and a drive wheel 31, the diameter of the gear disc 30 being larger than the diameter of the drive wheel 31. The drag chain 35 is fixedly mounted at one end to the frame 19 and at the other end to the turntable 29. The turntable drive motor 32 is connected to the drive shaft of the drive wheel 31. The cable and control wire of the turntable drive motor 32 is pulled by the drag chain 35, and the cable and control wire pass through the trunking of the drag chain 35. The drag chain 35 moves with the inner conveyor car 21. The drag chain 35 is composed of a plurality of unit chains, the links can rotate freely, and the drag chain can be used for traction and protection of built-in cables when being used for reciprocating motion. To prevent entanglement, wear, pull-off, hooking and scattering of the cable, the cable is typically placed in a cable tow chain, protecting the cable, and the cable can also move back and forth with the tow chain. The shielding transfer container 14 is placed on the turntable 29, and the turntable 29 drives the shielding transfer container 14 to rotate, so that the holes of the hanging basket 18 are aligned with the outlets of the telescopic sleeves 10, and the target box 3 accurately falls into the holes of the hanging basket 18.

As shown in fig. 7, 11 to 13, the shielded transport container 14 is a shield body composed of steel and lead materials. The shielded transport container 14 is generally cylindrical with a cavity therein. The shielded transport container 14 includes a barrel 38, an inner lid 16, an outer lid 39, and a basket 18.

The cylinder 38 includes a stepped cylindrical cavity, the basket 18 is placed in the cylinder 38, the stepped inner lid 16 is installed on the upper portion, and the outer lid 39 is installed on the outer portion of the inner lid 16.

The inner cap 16 is a cylinder with a stepped shape and is fitted over the cavity of the cylinder 38. The top of the inner cap 16 is provided with an inner cap hole with a stepped shape, the diameter of the upper hole of the inner cap hole is smaller than that of the lower hole of the inner cap hole, and an arc structure is arranged at the connecting part of the upper hole and the lower hole. The upper hole is used for inserting the guide head 45 of the inner cap hanger 17. The taper body of the movable inner rod 43 of the inner cover lifting tool 17 is inserted downwards, the ball pin 46 moves from inside to outside from the spherical hole under the action of the outward extrusion force of the taper body, and the arc-shaped structure position of the inner hole of the inner cover 16 is clamped, so that the inner cover lifting tool 17 and the inner cover 16 are locked. The taper body of the movable inner rod 43 of the inner cover lifting tool 17 is lifted up, the ball pin 46 loses the outward extrusion force of the taper body and retracts under the action of the arc-shaped structure, so that the inner cover lifting tool 17 and the inner cover 16 are separated.

The basket 18 is of a two-layered pie-shaped construction. The upper basket 51 has a plurality of through holes uniformly arranged along the circumferential direction, and a first control lever for transferring is provided in the middle, and is used for downstream process extraction and transferring of the basket. The lower basket 50 has a plurality of deep holes uniformly arranged along the circumferential direction, and a second control rod for transferring is provided in the middle. The upper basket 51 and the lower basket 50 have the same size, number of holes and distribution pitch, and can vertically hold the target cartridges 3. The target box 3 loaded into the basket is higher than the surface of the basket by a certain distance, so that the grabbing of the downstream process is facilitated, and the distance can be selected according to the downstream process. The lower basket 50 may be placed in the shielded transport container 14 alone or two baskets may be stacked together in the shielded transport container 14, the baskets 18 having the flexibility of loading the target cartridges 3.

The outer cover 39 is a disc with a hole in the middle, is connected with the cylinder 38 through bolts, limits the inner cover 16 and the hanging basket 18 to axially move, facilitates the transportation of the shielding transfer container 14, and reduces the tipping accident consequence of the shielding transfer container 14.

The shielded transport container 14 is placed on a turntable 29 and the rotation angle is precisely positioned by adding control components such as an existing shaft encoder. The turntable driving motor 32 is controlled by the shaft encoder and the PLC, and the turntable driving motor 32 drives the turntable 29 to be precisely positioned to a preset position by comparing the difference between the actual position of the turntable 29 and the preset position.

As shown in fig. 14-17, the lid hanger 17 is a specially designed tool for grasping, locking and releasing the lid 16 of the shielded transport container 14. The inner lid hanger 17 includes a hanging ring 40, a locking pin 41, a lever 42, a movable inner lever 43, an outer cylinder 44, a guide head 45, and a ball pin 46. As shown in fig. 7, the inner lid hanger 17 is suspended by a crane 36 outside the shield case 6.

The outer cylinder 44 is a cylindrical steel pipe, the upper end is provided with a threaded sealing cover, and the lower end is of a flange structure. The lifting ring 40 is screwed to the closure. The flange of the guide head 45 is connected with the flange at the lower end of the outer cylinder 44 through bolts. The upper end of the outer cylinder 44 is provided with a C-shaped groove, the control rod 42 is led into the outer cylinder 44 through the C-shaped groove to be connected with the movable inner rod 43, when the control rod 42 drives the movable inner rod 43 to move upwards to the leftmost position above the C-shaped groove, the ball pin 46 is in a retracted state, the locking pin 41 is inserted, and the inner cover lifting appliance 17 is kept in an unlocking state. When the operating lever 42 drives the movable inner lever 43 to move downwards to the leftmost position below the C-shaped groove, the ball pin 46 is in an extended state, the locking pin 41 is inserted, and the inner cover hanger 17 is kept in a locked state. The operation lever 42 is connected to the movable inner lever 43, and the other lever (right position) is connected to the outer cylinder 44 as shown in fig. 15, and functions as a grab bar, facilitating manual operation of the operation lever 42 and the lock pin 41.

The middle of the guide head 45 is provided with a through hole, the upper end is provided with a flange mechanism, and the lower end is provided with a conical structure. The middle section of the guide head 45 is provided with three spherical holes along the circumferential direction, and the spherical holes can accommodate the ball pins 46. The three spherical holes are, for example, arranged uniformly circumferentially. The size of the spherical hole is sized to ensure that the ball pin 46 engages the inner bore of the inner cap 16 and also to ensure that the ball pin 46 does not disengage outwardly from the spherical hole, i.e., the size of the exit of the spherical hole is small to block the ball pin 46 from fully disengaging outwardly, only a portion of the ball pin 46 extending. The ball pin 46 is movable within the spherical hole without being disengaged from the spherical hole. The movable inner rod 43 moves downwards, and the 3 ball pins 46 are forced to extend out under the action of the taper body at the lower end of the movable inner rod 43. The movable inner rod 43 moves upwards, the conical force at the lower end of the movable inner rod 43 disappears, and the 3 ball pins 46 can retract into the through holes formed in the middle of the guide head 45.

The movable inner rod 43 is arranged in the outer cylinder 44, the lower end of the movable inner rod 43 is provided with a certain taper, and the upper end of the movable inner rod 43 is connected with the operating rod 42. The movable inner rod 43 is installed in the outer cylinder 44, the end with the taper body (lower end in fig. 16) is inserted into the guide head 45, and the operating rod 42 drives the movable inner rod 43 to move along the C-shaped groove of the outer cylinder 44.

The lever 42 moves upward and the ball pin 46 of the guide head 45 is retracted. The lever 42 moves downward and the ball pin 46 of the guide head 45 protrudes. The guide head 45 is inserted into the hole of the inner cap 16, and the inner cap hanger 17 is locked and unlocked from the inner cap 16 by the extension and retraction of the ball pin 46.

As shown in fig. 4 and 7, a gamma probe 27 is installed inside the shielding box 6 for detecting the gamma dose level of the box, and only if the gamma dose is lower than a certain level, the shielding door 13 is allowed to be opened, preventing personnel from receiving accidental irradiation.

A camera 28 is mounted inside the shielded enclosure 6 for viewing the operation of the equipment within the shielded enclosure via a remote terminal. The number and mounting positions of cameras 28 may be selected according to the actual situation.

In addition, the invention also provides a method for transferring the target box after heavy water reactor irradiation, which comprises the following steps:

step 1: a negative pressure is established in the transfer tube 5, by means of which the target cassette 3 is transferred from the cassette receiving bay 4 to the vertical section of the transfer tube 5. In step 1, the target cassette 3 is stored in the vertical section of the transfer tube 5 for a period of time to allow decay of the very short half-life species of the target cassette 3, reducing the dosage level of the cassette 3 loading operation and the shielded transfer container 14.

Step 2: the shielding door 13 is opened, the shielding transfer container 14 is placed on the turntable 29 of the inner layer conveyance carriage 21, and the outer cover 39 of the shielding transfer container 14 is removed.

Step 3: the inner layer conveying trolley 21 moves the shielding transfer container 14 to the inner cover operation position, the inner cover hanger 17 lifts the inner cover 16 of the shielding transfer container 14, the inner layer conveying trolley 21 moves the shielding transfer container 14 to the target box loading position, and the shielding door 13 is closed.

Step 4: the cassettes 3 in the vertical section of the transfer tube 5 are sequentially loaded into holes of the basket in the shielding transfer container 14 in the shielding box 6.

Step 5: mounting the inner lid 16 to the top of the shielding transfer container 14 in the shielding box 6;

step 6: the shielded transport container 14 is carried out of the shielded box 6 by the conveyor belt 15, and the outer cover 39 is mounted on the shielded transport container 14.

Step 7: the shielded transport container 14 is transported to a designated location.

Specifically, the implementation process of the target box transmission method after heavy water reactor irradiation provided by the invention is as follows:

the control ball valve 11 is closed, the plug of the separator 7 is retracted, the vacuum pump 8 is started, the target boxes 3 are sucked into the vertical sections of the transfer tube 5 one by one as the trolley in the production channel moves, and the counter 12 counts the target boxes 3 entering the vertical sections of the transfer tube 5.

The inner layer conveying trolley 21 is moved to the shielding transfer container lifting position by the conveyor belt driving motor 24, and the shielding door 13 is in an opened state.

The factory crane places the shielded transport container 14 onto the turntable 29 of the inner conveyor trolley 21. The outer cover 39 of the shielded transport container 14 is removed.

The conveyor driving motor 24 moves the inner layer conveyance carriage 21 to the inner lid operating position. The crane 36 inserts the cap hanger 17 into the hole of the cap 16, locks the cap hanger 17 with the cap 16 after in place, inserts the locking pin 41, and lifts the cap 16 off the shielding transfer container 14 to a predetermined height.

The conveyor belt driving motor 24 moves the inner layer conveyance carriage 21 to the target box loading position, and the shield door 13 is closed.

The telescopic cylinder 52 is driven to lower the telescopic tube 10 to a preset position above the basket.

The turntable drive motor 32 drives the turntable 29 and thereby drives the shield transport container 14, which is placed on top of the turntable 29, to rotate together with one of the holes of the basket 18 axially aligned with the telescopic tube 10.

The target separation cylinder 53 of the separator 7 drives the insertion of the pins between the two target boxes 3.

The control ball valve 11 is opened, and one target box 3 falls into the hole of the hanging basket 18 by gravity.

The control ball valve 11 is closed, the pin of the separator 7 is retracted, the next target cartridge 3 falls to a position above the control ball valve 11, and then the pin of the separator 7 is inserted.

The turntable drive motor 32 rotates the shield transport container 14 to the next empty position of the basket 18, aligned with the telescoping tube 10.

The above operation is repeated, and all the target cartridges 3 are loaded into the holes of the basket 18.

The telescopic tube telescoping cylinder 52 is driven to lift the telescopic tube 10 to a preset position.

The conveyor driving motor 24 moves the inner layer conveyance carriage 21 to the inner lid operating position.

The inner lid hanger 17 is operated to place the inner lid 16 onto the shielding transfer container 14. The inner cap hanger 17 is unlocked and lifted to a preset position.

The conveyor belt drive motor 24 moves the inner layer conveyor trolley 21 to the shielding container lifting position.

The operator manually installs the outer cover 39 of the shielded transport container 14.

The shielded transport container 14 is transported to a designated location of the factory by the factory crane.

The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present invention should be included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (42)

1. A heavy water reactor post-irradiation target box transfer device, comprising:

A transfer tube (5) for receiving the target boxes (3) and passing through the top of the heavy water pile, and having a vertical section, a part of which is inserted into a shielding box (6), the vertical section being provided with a separator (7) for allowing the target boxes (3) to enter the shielding box (6) one by one, the transfer tube (5) being provided with a vacuum pump (8) for creating a negative pressure in the transfer tube (5) to suck the target boxes (3) into the vertical section;

a shielding transfer container (14) for loading the target box (3), an inner lid (16) of the shielding transfer container (14) being mounted or lifted off by an inner lid lifting tool (17) mounted on the shielding box (6); and

-a conveyor belt (15) for transporting the shielding transfer container (14) into or out of the shielding box (6).

2. The post-irradiation target box conveying device of a heavy water pile according to claim 1, wherein the separator (7) comprises a target separation cylinder (53) and a bolt connected to the front end of the target separation cylinder (53), and the target separation cylinder (53) drives the bolt to move.

3. The post-irradiation target box transfer device according to claim 2, wherein a nozzle is provided on the vertical section, through which the pin passes into and out of the transfer tube (5).

4. The heavy water reactor post irradiation target box transmission device according to claim 1, wherein a control ball valve (11) is arranged below the installation position of the separator (7) by the transmission pipe (5), and the control ball valve (11) connects the upper part and the lower part of the vertical section into a whole.

5. The heavy water reactor post irradiation target box transmission device according to claim 4, wherein the control ball valve (11) has a channel which is the same as the inner diameter of the transmission pipe (5), and when the control ball valve (11) is opened, the control ball valve (11) forms a channel with the transmission pipe (5) inside to enable the target box (3) to enter the shielding box (6) through the control ball valve (11); when the control ball valve (11) is closed, the transfer tube (5) is closed to form a negative pressure at the inlet of the transfer tube (5) so that the target box (3) enters the vertical section.

6. The post-irradiation target box transmission device according to claim 1 or 5, wherein the transmission pipe (5) is sleeved with a telescopic pipe (10), the telescopic pipe (10) penetrates into the shielding box (6), and the telescopic pipe (10) is driven by a telescopic pipe telescopic cylinder (52) to enable the telescopic pipe (10) to move up and down relative to the transmission pipe (5).

7. The post-irradiation target box transfer device according to claim 1, characterized in that the vacuum pump (8) is connected to the vertical section by a pipeline, on which a control valve group (9) is provided.

8. The post-irradiation magazine transfer device of claim 1, wherein the vertical segments are inserted vertically into the shielding box (6).

9. The post-irradiation target box transmission device according to claim 1, wherein a counter (12) is sleeved on the vertical section for recording the number of target boxes (3) entering the vertical section.

10. The post-irradiation target box conveying device of a heavy water pile according to claim 1, characterized in that a target box receiving groove (4) is connected to the inlet of the conveying pipe (5), and the target box receiving groove (4) is used for receiving the target box (3) falling from the discharge opening (2) of the irradiation device (1).

11. The post-irradiation target box transmission device according to claim 1 or 10, wherein the target box (3) is cylindrical in shape and has arc-shaped ends at both ends.

12. The heavy water reactor post irradiation target box transmission device according to claim 1, wherein the shielding box (6) is a box body with lead shielding, two lifting appliance holes and sleeve holes with a certain distance are formed in the top, a pore is formed in the front end to enable the transmission belt (15) to enter and exit the shielding box (6), and a viewing window (26) is formed in the rear end.

13. The post-irradiation target cassette transfer device of claim 1, wherein the shielded transport container (14) comprises the inner cover (16), a basket (18), and a barrel (38), the basket (18) being disposed in the barrel (38).

14. The post-irradiation target box transfer device of claim 13, wherein the cylinder (38) has a stepped cylindrical cavity, and the inner cover (16) is a cylinder with a step, and the step is fitted to an upper portion of the stepped cylindrical cavity.

15. The post-irradiation target box transfer device according to claim 13 or 14, wherein the top of the inner cover (16) is provided with an inner cover hole with a step shape, the upper hole diameter of the inner cover hole is smaller than the lower hole diameter, and the upper hole and the lower hole connecting part are provided with arc structures.

16. The heavy water reactor post-irradiation target box transmission device according to claim 13, wherein the hanging basket (18) is of a two-layer cake-shaped structure and comprises an upper hanging basket (51) and a lower hanging basket (50), the upper hanging basket (51) is uniformly provided with a plurality of through holes along the circumferential direction, the lower hanging basket (50) is uniformly provided with a plurality of deep holes along the circumferential direction, and the sizes, the number of holes and the distribution interval of the upper hanging basket (51) and the lower hanging basket (50) are the same.

17. The post-irradiation target box transfer device of claim 16, wherein a first lever is provided in the middle of the upper basket (51) for downstream process extraction and transfer of the upper basket (51), and a second lever is provided in the middle of the lower basket (50) for downstream process extraction and transfer of the lower basket (50).

18. The post-irradiation target cassette transport device of claim 13, wherein the shielded transport container (14) further comprises an outer cover (39), the outer cover (39) being a disc with an intermediate opening, coupled to the barrel (38), limiting axial movement of the inner cover (16) and the basket (18).

19. The post-irradiation target box conveying device of a heavy water pile according to claim 1, wherein the conveying belt (15) comprises a frame (19), an intermediate conveying mechanism (20) and an inner conveying trolley (21), the inner conveying trolley (21) is slidably arranged on the intermediate conveying mechanism (20), and the intermediate conveying mechanism (20) is slidably arranged on the frame (19).

20. The heavy water reactor post irradiation target box transmission device according to claim 19, wherein the rack (19) is installed in the shielding box (6) and comprises two opposite parallel C-shaped channel steel, a plurality of transverse brackets connected between the two C-shaped channel steel, one end outside the C-shaped channel steel is provided with a transmission belt driving motor (24) and a gear box (25), the other end is provided with a driven sprocket (23), and the driven sprocket (23) is connected with a driving sprocket (48) in the gear box (25) through a chain (47).

21. The post-irradiation target box transfer device according to claim 20, wherein the transfer belt drive motor (24) is connected with a horizontal bevel gear (34) in the gear box (25) through a coupling (33), the drive sprocket (48) and a vertical bevel gear are disposed on the same shaft, and the vertical bevel gear is meshed with the horizontal bevel gear (34).

22. The heavy water reactor post irradiation target box conveying device according to claim 19, wherein the middle conveying mechanism (20) comprises two opposite parallel C-shaped channel steel, a plurality of transverse brackets connected between the two C-shaped channel steel, and rollers (54) are arranged at two ends of the outer side of the C-shaped channel steel of the middle conveying mechanism (20); one end of the middle conveying mechanism (20) is fixedly connected with the shielding door (13), the other end of the middle conveying mechanism is installed in C-shaped channel steel of the frame (19), a stop block is arranged on the inner side of the C-shaped channel steel of the frame (19), the movement stroke of the middle conveying mechanism (20) is limited, and the middle conveying mechanism (20) is prevented from being separated from the frame (19).

23. The heavy water reactor post irradiation target box conveying device according to claim 19, wherein the inner layer conveying trolley (21) comprises two opposite parallel C-shaped channel steel and a plurality of transverse brackets connected between the two C-shaped channel steel, guide wheels (55) are respectively arranged at two ends of the outer side of the C-shaped channel steel of the inner layer conveying trolley (21), the guide wheels (55) move along the inner side of the C-shaped channel steel of the middle conveying mechanism (20), and two ends of the C-shaped channel steel of the middle conveying mechanism (20) are closed to limit the inner layer conveying trolley (21) to be separated from the middle conveying mechanism (20).

24. The post-irradiation target box transmission device of claim 23, wherein a driving plate (22) is mounted on the inner layer conveying trolley (21), one end of the driving plate (22) is welded on the inner layer conveying trolley (21), the other end of the driving plate is arranged above a chain (47), and the driving plate (22) is connected with the chain (47) through a connecting piece.

25. The post-irradiation magazine transfer device according to any one of claims 19 to 24, wherein a turntable (29) is provided on the inner layer transfer cart (21), the turntable (29) carrying and rotating the shielded transfer container (14).

26. The post-irradiation target box transfer device according to claim 25, wherein the turntable (29) comprises a gear plate (30) and a driving wheel (31) and a turntable driving motor (32), the shielding transfer container (14) is placed on the gear plate (30), the turntable driving motor (32) drives the driving wheel (31), and the driving wheel (31) drives the gear plate (30) to rotate.

27. The post-irradiation target box transmission device according to claim 26, wherein a drag chain (35) is arranged on the transmission belt (15), one end of the drag chain (35) is fixedly arranged on the frame (19), and the other end of the drag chain is arranged on the turntable (29).

28. The heavy water reactor post irradiation target box conveying device according to claim 19, wherein the conveying belt (15) is provided with a target box loading position, an inner cover operating position and a shielding transfer container lifting position, when the conveying belt (15) is positioned at the target box loading position, a shielding door (13) is in a closed state, and the target boxes (3) are individually loaded into the shielding transfer containers (14); the conveyor belt (15) is positioned at the inner cover operation position, the shielding door (13) is in a closed state, and the inner cover (16) is lifted off or loaded by using the inner cover lifting tool (17); the transmission belt (15) is positioned at the hoisting position of the shielding transfer container, the shielding door (13) is in an open state, and the shielding transfer container (14) is hoisted in or lifted out through an external crane.

29. The post-irradiation target box transfer device of claim 28, wherein the shielding box (6) is provided with a manual operation hole, a detachable plug (49) is arranged on the manual operation hole, and a rotary tool passes through the manual operation hole to drive the transfer belt (15) to the inner cover operation position in a manual driving mode.

30. The heavy water reactor irradiated target box transmission device according to claim 1, wherein the inner cover lifting tool (17) comprises a locking pin (41), an operating rod (42), a movable inner rod (43), an outer cylinder (44), a guide head (45) and a ball pin (46), the movable inner rod (43) is arranged in the outer cylinder (44), a C-shaped groove is formed in the outer cylinder (44), the operating rod (42) is connected with the movable inner rod (43) through the C-shaped groove, a taper body is arranged at the lower end of the movable inner rod (43), and the taper body pushes the ball pin (46) to extend out of the guide head (45).

31. The post-irradiation target box transmission device according to claim 30, wherein three spherical holes are formed in the middle section of the guide head (45) along the circumferential radial direction, and three spherical pins (46) are arranged in the spherical holes.

32. The post-irradiation target box transfer device of claim 30, wherein the inner cover hanger (17) further comprises a hanging ring (40), and the hanging ring (40) is in threaded connection with a cover at the upper end of the outer cylinder (44).

33. The post-irradiation target box transfer device of claim 30, wherein the inner cover hanger (17) is lifted by a crane (36) outside the shielding box (6).

34. The post-irradiation target box transmission device of the heavy water pile according to claim 1, wherein a gamma probe (27) and a camera (28) are installed in the shielding box (6).

35. A method for transporting a target box after heavy water reactor irradiation, comprising the steps of:

a negative pressure environment is established in the transmission pipe, and the target boxes are sequentially sucked into the vertical section of the transmission pipe from the inlet of the transmission pipe;

sequentially loading the target boxes in the vertical section into specified positions in a shielding transfer container in a shielding box;

after the shielding transfer container is filled, an inner cover is arranged in the shielding box, and an outer cover is arranged outside the shielding box.

36. The method for transporting a heavy water reactor irradiated target box according to claim 35, wherein the transporting method specifically comprises the following steps:

step 1: establishing negative pressure in the transmission pipe, and transmitting the target box to the vertical section from a target box receiving groove in a negative pressure mode;

step 2: opening a shielding door, placing the shielding transfer container on a turntable of an inner layer conveying trolley, and removing the outer cover;

step 3: the inner layer conveying trolley moves the shielding transfer container to an inner cover operation position, an inner cover tool lifts the inner cover, the inner layer conveying trolley moves the shielding transfer container to a target box loading position, and the shielding door is closed;

step 4: sequentially loading the target boxes in the vertical section into holes of hanging baskets in the shielding transfer container;

step 5: mounting the inner lid to the top of the shielded transport container in the shielded enclosure;

step 6: transporting the shielding transfer container out of the shielding box through a transmission belt, and mounting the outer cover on the shielding transfer container;

step 7: and transporting the shielding transfer container to a designated position.

37. The post-irradiation target box conveying method of claim 36, wherein step 1 comprises:

Closing the control ball valve, withdrawing the plug pin of the separator, and starting the vacuum pump;

as the carts move within the production tunnel, the cassettes are sucked into the vertical section one by one, and a counter counts the cassettes entering the vertical section.

38. The post-irradiation target box conveying method of claim 36, wherein step 2 comprises:

the inner layer conveying trolley is moved to a hoisting position of the shielding transfer container by a conveying belt driving motor;

and placing the shielding transfer container on the turntable of the inner layer conveying trolley by a factory crane, and removing the outer cover.

39. The post-irradiation target box conveying method of claim 36, wherein step 3 comprises:

the inner layer conveying trolley is moved to an inner cover operation position by a conveying belt driving motor, the inner cover tool is inserted into a hole of the inner cover by a crane, the inner cover lifting tool is locked with the inner cover after the inner cover tool is in place, a locking pin is inserted, and the inner cover is lifted off the shielding transfer container to a preset height;

and the conveyor belt driving motor moves the inner layer conveying trolley to a target box loading position, and the shielding door is closed.

40. The post-irradiation target box conveying method of claim 36, wherein step 4 comprises:

Driving a telescopic cylinder of the telescopic pipe to descend the telescopic pipe to a preset position above the hanging basket;

the rotary table driving motor rotates the shielding transfer container to enable one hole of the hanging basket to be axially aligned with the telescopic sleeve;

the target piece separating cylinder drives a bolt to be inserted between the two target boxes;

opening a control ball valve, wherein the target box falls into the hanging basket hole by gravity;

closing the control ball valve, withdrawing the plug pin, enabling the next target box to fall to the position above the control ball valve, and then inserting the plug pin;

the turntable driving motor rotates the shielding transfer container to the next empty position of the hanging basket and aligns the telescopic sleeve;

repeating the above operation, and loading all target boxes into the holes of the hanging basket.

41. The post-irradiation target box conveying method of claim 36, wherein the step 5 comprises:

driving a telescopic cylinder of the telescopic pipe to lift the telescopic pipe to a preset position;

a conveyor belt driving motor moves the inner layer conveying trolley to the inner cover operation position;

and operating an inner cover lifting appliance, installing the inner cover on the shielding transfer container, unlocking the inner cover lifting appliance, and lifting to a preset position.

42. The post-irradiation target box transfer method of claim 36, wherein step 6 comprises:

the inner layer conveying trolley is moved to a shielding container hoisting position by a conveying belt driving motor;

the outer cover is mounted on the shielded transport container.