A target loading device for producing short half-life isotopes in heavy water reactors

Abstract

This invention provides a target loading device for producing short-half-life isotopes in a heavy water reactor, comprising a channel, an electric cylinder, and a target drum assembly. One end of the channel leads to the reactor core. The target drum assembly sequentially pushes the loaded targets to the target outlet. The main shaft of the electric cylinder is coaxially arranged with the target outlet, driving the main shaft to move towards the target outlet to push the target at the outlet into the channel. The target enters the reactor core through the channel. This invention enables the loading of short-half-life radioactive isotope targets for several days or tens of days during heavy water reactor power operation, facilitating installation and maintenance. Different types and quantities of isotope targets can be loaded into the core production channel during heavy water reactor power operation.

Description

Technical Field

[0001] This invention relates to the field of isotope production technology in heavy water reactors, and more particularly to a target loading device for producing short half-life isotopes in heavy water reactors. Background Technology

[0002] Existing isotope production facilities can only install target-laden components into the active zone of the reactor core during heavy water reactor shutdown overhauls by removing the reactor's control components. The irradiated isotope targets are removed during the next overhaul (every two years). Furthermore, existing facilities are only suitable for loading long-cycle radioactive isotopes. During heavy water reactor power operation, loading short-half-life radioactive isotopes (lasting only a few days or tens of days) is not feasible.

[0003] Furthermore, in existing technology, the target assembly comprises several rod bundle components, each rod bundle component contains several target rods, and each target rod contains several target components. At the center of the target assembly is a zirconium alloy central rod, on which the rod bundle components are mounted. A locking nut is attached to the lower end, and a wire rope connecting nut and wire rope are attached to the upper end. After the target assembly is hoisted into the heavy water reactor's channel, the channel is sealed. Once the target is loaded, it cannot be replaced mid-operation and can only be removed during the next major overhaul. Summary of the Invention

[0004] The main objective of this invention is to provide a target loading device for the production of short half-life isotopes in heavy water reactors, solving the problem that it is impossible to load short half-life radioactive isotope targets that last for several days or tens of days during the power operation of heavy water reactors.

[0005] Another objective of this invention is to provide a target loading device for producing short half-life isotopes in heavy water reactors, solving the problem that isotope targets cannot be automatically loaded into the core production channel during heavy water reactor power operation.

[0006] Another objective of this invention is to provide a target loading device for the production of short half-life isotopes in heavy water reactors, solving the problem of loading different types and quantities of isotope targets into the core production channel during heavy water reactor power operation.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A target loading device for producing short half-life isotopes in a heavy water reactor includes a channel, an electric cylinder, and a target drum assembly. One end of the channel leads to the reactor core. The target drum assembly sequentially pushes the loaded target to the target outlet. The main shaft of the electric cylinder is coaxially arranged with the target outlet and drives the main shaft to move toward the target outlet to push the target at the target outlet into the channel. The target enters the reactor core through the channel.

[0009] In one feasible embodiment, the target drum assembly includes a target drum body, a central rod, a spindle, a spiral spring, a spiral spring seat, a target-shifting wheel, and a ratchet mechanism. The central rod is disposed on the base plate of the target drum body. The spindle is sleeved on the central rod and rotates around it. The spindle is connected to the inner end of the spiral spring and is slidably connected to the ratchet mechanism. The spiral spring seat is sleeved on the outer side of the spindle and accommodates the spiral spring. The outer end of the spiral spring is fixedly connected to the spiral spring seat, and the inner end is fixedly connected to the spindle. The ratchet mechanism is connected to the target-shifting wheel.

[0010] As one possible implementation, the ratchet mechanism includes a ratchet, a pawl, and a pawl spring. The pawl spring is sleeved on the central rod, and the ratchet is arranged above the pawl spring. The ratchet and the pawl are engaged by the pawl spring, and the pawl is slidably connected to the spindle.

[0011] As one possible implementation, the upper part of the mandrel has a mandrel inner hole, and the upper two sides of the mandrel inner hole have mandrel grooves. The pawl slides up and down in the mandrel groove by the action of the pawl spring to disengage from or engage with the ratchet.

[0012] As one possible implementation, the target wheel is fixedly connected to the ratchet and arranged coaxially.

[0013] As one possible implementation, the mandrel is threadedly connected to an internal rotating handle, the upper end of which is provided with a rotating handle, and the lower end is threadedly connected to the mandrel.

[0014] As one possible implementation, a spring is fitted around the outer periphery of the pressure bar, the spring abutting against the inner rotating hand, and the lower end of the pressure bar passes through the inner rotating hand.

[0015] As one possible approach, an inner hole is formed at the top of the inner rotating hand to mount the spring.

[0016] As one possible approach, a target drum cover is hinged to the target drum body, and the target drum cover is locked to the target drum body by a snap-fit.

[0017] As one possible implementation, the target drum cover is provided with an external rotating handle, and when the target drum cover is closed, the external rotating handle engages with the internal rotating handle.

[0018] As one feasible approach, the target wheel has alternating long and short slots on its surface to axially place multiple target components.

[0019] As one possible implementation, the spiral spring seat is fixed to the base plate.

[0020] As one possible implementation, the base plate is provided with a spiral guide groove, one end of which starts near the outer side of the coil spring seat and the other end ends at the junction of the target drum body and the target outlet, and the target component enters the target outlet sequentially along the spiral guide groove.

[0021] As one possible approach, a target guide plate is installed inside the target drum near the target outlet, and the target guide plate is tangent to the outer edge of the target that enters the target outlet along the spiral guide groove.

[0022] As one feasible approach, one end of the top target rod is connected to the target wheel via a spring plate, and the other end is connected to a simulated target of the same size as the target component, with the top target rod located within the spiral guide groove.

[0023] As one feasible approach, one end of the target outlet is fixedly connected to the target drum body, and the other end accommodates several target components to be pushed out.

[0024] As one possible approach, the target drum body is a cylindrical structure.

[0025] As one possible implementation, the electric cylinder includes a driving pulley, a synchronous belt, a driven pulley, and a motor. The output shaft of the motor is connected to the driving pulley, and the driven pulley is connected to the main shaft. The main shaft can be moved forward or backward by the forward and reverse rotation of the motor.

[0026] As one possible approach, the other end of the channel is connected to a target drive mechanism located on the reactor control platform, and the channel is provided with a loading port.

[0027] As one possible implementation, the target outlet is connected to a chute, the outlet of which leads to the loading port.

[0028] As one possible approach, the channel is provided with a series of trolleys that are articulated sequentially.

[0029] As one possible implementation, the electric cylinder is fixedly mounted on the electric cylinder support, and the target drum assembly is fixedly mounted on the target drum support.

[0030] Compared with the prior art, the target loading device for producing short half-life isotopes in heavy water reactors provided by the present invention has the following advantages:

[0031] The target loading device provided by this invention includes a target drum assembly and an electric cylinder. This invention enables the loading of short-half-life radioactive isotope targets (lasting several days or tens of days) during heavy water reactor power operation, facilitating installation and maintenance. By incorporating the target drum assembly and electric cylinder, multiple target loading operations can be performed according to production needs while the unit is operating at full power. Furthermore, the target drum assembly allows for the loading of required targets in non-radiation areas, reducing the radiation dose received by personnel in radiation-controlled zones.

[0032] Furthermore, the target drum assembly can accommodate up to 30 targets, which can meet the maximum loading capacity of the production channel at one time. It can load the required number of targets at one time according to production needs, and has loading flexibility. The present invention can also load different types of isotope targets into the core production channel during heavy water reactor power operation.

[0033] Furthermore, under the action of the spiral spring and the helical guide groove, the target components inside the target drum are pushed into the target outlet in a predetermined order. The target components located at the target outlet are pushed onto the trolley by the electric cylinder, thus realizing the automatic loading of the target components. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is a side view of a target loading device for producing short half-life isotopes in a heavy water reactor, as provided in an embodiment of the present invention.

[0036] Figure 2 This is a cross-sectional view of a target loading device for producing short half-life isotopes in a heavy water reactor, provided in an embodiment of the present invention.

[0037] Figure 3 This is a top view of the target loading device for producing short half-life isotopes in a heavy water reactor, as provided in an embodiment of the present invention.

[0038] Figure 4 This is a schematic diagram of the target drum assembly provided in an embodiment of the present invention, in which the target component inside is partially shown;

[0039] Figure 5 for Figure 2 Enlarged view of section II in the middle;

[0040] Figure 6 This is a perspective view of the target drum assembly provided in an embodiment of the present invention;

[0041] Figure 7 This is a schematic diagram of the mandrel structure provided in an embodiment of the present invention;

[0042] Figure 8 This is a schematic diagram of the target wheel provided in an embodiment of the present invention.

[0043] Explanation of reference numerals in the attached figures:

[0044] 1. Channel; 2. Trolley; 3. Electric cylinder support; 4. Electric cylinder transmission box; 5. Driving pulley; 6. Synchronous belt; 7. Driven pulley; 8. Motor; 9. Main shaft; 10. Electric cylinder housing; 11. Target drum body; 12. Target outlet; 13. Inclined groove; 14. Target component; 15. Inner rotating handle; 16. Outer rotating handle; 17. Target drum cover; 18. Hinge; 19. Top target rod; 20. Buckle; 21. Guide plate; 22. Loading port; 23. Pressure rod; 24. Spring; 25. Ratchet; 26. Pawl; 27. Target wheel; 28. Center rod; 29. ​​Spindle; 30. Pawl spring; 31. Scroll spring; 32. Scroll spring seat; 33. Electric cylinder; 34. Target drum assembly; 35. Spiral guide groove; 36. Target drum bracket; 37. Spindle groove. Detailed Implementation

[0045] like Figures 1 to 8 As shown, this invention provides a target loading device for producing short-half-life isotopes in heavy water reactors, comprising a channel 1, a trolley 2, an electric cylinder support 3, an electric cylinder 33, a target drum assembly 34, and a target drum support 36. One end of the channel 1 leads to the reactor core. The target drum assembly 34 sequentially pushes the loaded target 14 to the target outlet 12. The main shaft 9 of the electric cylinder 33 is coaxially arranged with the target outlet 12, driving the main shaft 9 to move towards the target outlet 12 to push the target 14 at the target outlet 12 into the channel 1, thereby allowing the target 14 to enter the reactor core through the channel 1. The target 14 is a cylindrical metal body internally encapsulating the isotope material to be irradiated.

[0046] Specifically, the electric cylinder 33 is fixedly mounted on the electric cylinder support 3, and the target drum assembly 34 is fixedly mounted on the target drum support 36. By adjusting the positions of the electric cylinder support 3 and the target drum support 36, the outermost target piece 14 of the target outlet 12 of the target drum assembly 34 is aligned with the main shaft 9 on the same axis.

[0047] like Figure 1 and Figure 2 As shown, channel 1 is located below the target drum assembly 34. Channel 1 is, for example, a tubular production channel. One end of channel 1 extends into the reactor core, and the other end connects to the target drive mechanism located on the reactor control platform. Figure 4 As shown, channel 1 is partially provided with loading port 22 to facilitate loading of target 14. Loading port 22 is the channel for target 14 to enter and exit the reactor core.

[0048] like Figure 2 As shown, a set of trolleys 2 are provided in the channel 1, and the trolleys 2 are used to hold the target 14. Several trolleys 2 are connected together by hinges to form a target trolley string, which is placed in the production channel 1. The channel 1 is connected to the target trolley drive mechanism, and the target trolley string moves in the production channel under the pull of the steel wire rope of the drive mechanism.

[0049] like Figure 1 and Figure 2 As shown, the electric cylinder 33 includes a motor 8, an electric cylinder transmission box 4, an electric cylinder housing 10, and a main shaft 9. The electric cylinder transmission box 4 includes a driven pulley 7, a driving pulley 5, and a synchronous belt 6. The output shaft of the motor 8 is connected to the driving pulley 5, and the synchronous belt 6 transmits torque to the driven pulley 7, which is connected to the main shaft 9. The main shaft 9 moves forward or backward by the forward and reverse rotation of the motor 8.

[0050] like Figures 4 to 6 As shown, the target drum assembly 34 includes a target drum body 11, a target outlet 12, an inner rotating handle 15, a target drum cover 17, a target-top rod 19, a pressure rod 23, a target-shifting wheel 27, a center rod 28, a spindle 29, a spiral spring 31, a spiral spring seat 32, and a ratchet mechanism. The target drum assembly 34 can accommodate up to 30 target pieces 14, which can meet the maximum single loading capacity of the production channel. It can load the required number of target pieces at a time according to production needs, providing loading flexibility.

[0051] One end of the target outlet 12 is fixedly connected to the target drum body 11, and the other end accommodates several target pieces 14 to be pushed out. One end of the target outlet 12 is narrowed to restrict the lateral movement of the target pieces 14, and the outermost target piece 14 can only be pushed out by the electric cylinder 33 along the axial direction. That is to say, the outermost target piece 14 cannot move radially, but can only be pushed away from the target outlet 12 axially by the electric cylinder spindle 9. The target outlet 12 is connected to an inclined groove 13, and the target pieces 14 pushed out by the target outlet 12 are loaded into the trolley 2 in the production channel 1 along the inclined groove 13 through the loading port 22.

[0052] The ratchet mechanism includes a ratchet 25, a pawl 26, and a pawl spring 30. The pawl 26 and pawl spring 30 are respectively installed inside the spindle 29, with the pawl 26 slidably connected to the spindle 29. Under the action of the pawl spring 30, the pawl 26 engages with the ratchet groove of the ratchet 25. The ratchet mechanism enables the spindle 29 and the target wheel 27 to be disengaged or engaged.

[0053] like Figure 4 , Figure 5 and Figure 8As shown, the target-setting wheel 27 has a double-layer structure, with the two layers fixedly connected by several support pillars. The upper and lower surfaces of the target-setting wheel 27 have alternating long and short placement grooves to axially place multiple target pieces 14. The upper plate of the target-setting wheel 27 is fixedly connected to the ratchet 25 and arranged coaxially. The target-setting wheel 27 is mounted on the spindle 29. When the ratchet 25 and pawl 26 are engaged, the spindle 29 drives the target-setting wheel 27 to rotate; when the ratchet 25 and pawl 26 are disengaged, the target-setting wheel 27 can rotate freely around the spindle 29. The double-layer structure of the target-setting wheel 27 can position the target piece 14, maintain its vertical position, and ensure that the target piece 14 is evenly stressed when moving within the spiral guide groove 35, preventing tilting. The target-setting wheel 27 is connected to the top target rod via a spring plate, pushing the simulated target to the target outlet 12, completing the loading of the last target piece.

[0054] like Figure 5 As shown, the target drum body 11 has a cylindrical structure. A central rod 28 is provided at the center of the base plate of the target drum body 11, and a spindle 29 is sleeved on the central rod 28, providing rotational guidance for the spindle 29. A spiral spring seat 32 is fixed to the base plate of the target drum body 11 and sleeved on the outside of the spindle 29. The spiral spring seat 32 is used to accommodate a spiral spring 31. The spiral spring 31 is installed in the spiral spring seat 32, with its inner end fixedly connected to the spindle 29 and its outer end fixedly connected to the spiral spring seat 32.

[0055] like Figure 5 and Figure 7 As shown, the mandrel 29 is equivalent to a bushing. The upper part of the mandrel 29 has an inner hole with internal threads. The upper part of the mandrel 29 has two axially spaced grooves 37, arranged at 180° angles. That is, two grooves 37 are formed on both sides of the upper part of the inner hole.

[0056] The spindle 29 rotates around the central rod 28. The spindle 29 is connected to the inner end of the spiral spring 31. Rotating the spindle 29 clockwise tightens the spiral spring 31. The spindle 29 is slidably connected to the pawl 26 through the spindle grooves 37 on both sides of the upper part of the spindle's inner hole. Under the action of the pawl spring 30, the pawl 26 slides up and down along the spindle groove, realizing the disengagement and engagement of the ratchet 25 and the pawl 26. The inner hole of the spindle is threadedly connected to the inner screw handle 15. The assembly sequence is to install the pawl spring 30 and the pawl 26 into the spindle 29, and then screw the inner screw handle 15 into the internal thread of the spindle's inner hole.

[0057] The inner rotating handle 15 has a rotating handle at its upper end and is threaded to the spindle 29 at its lower end. The axial positioning target wheel 27 and ratchet 25 provide axial positioning for the target wheel 27. By rotating the handle of the inner rotating handle 15 clockwise, the spindle 29 is driven to tighten the spiral spring 31, which transmits the spring force to the target wheel 27. The inner hole of the inner rotating handle 15 is fitted with a spring 24 and a pressure rod 23.

[0058] like Figure 5 and Figure 6As shown, the bottom plate of the target drum body 11 is provided with a spiral guide groove 35, one end of which starts near the outer side of the coil spring seat 32, and the other end ends at the junction of the target drum body 11 and the target outlet 12. All target pieces 14 in the target-adjusting wheel 27 are located in the spiral guide groove 35. When the target drum assembly 34 is loading the target pieces, the target-adjusting wheel 27 rotates counterclockwise under the action of the spiral spring 31, and the target pieces 14 enter the target outlet 12 sequentially along the spiral guide groove 35.

[0059] One end of the target-top rod 19 is connected to the target-shifting wheel 27 via a spring plate, and the other end is connected to a simulated target with the same external dimensions as the target piece 14, located within the spiral guide groove 35. The target-top rod 19 pushes the last target piece 14 to the outermost position of the target outlet 12, thereby loading all the target pieces 14 within the target drum body 11.

[0060] A spring 24 is fitted around one end of the pressure rod 23 and inserted into the inner rotating handle 15 together with the spring 24. A radial hole is drilled in the lower part of the pressure rod 23. After the pressure rod 23 is inserted into the inner rotating handle 15, a cotter pin is inserted. The cotter pin is arranged perpendicularly to the pressure rod 23 to prevent the pressure rod 23 from detaching from the inner rotating handle 15. Pressing down on the pressure rod 23 causes it to contact and press against the pawl 26. The pawl 26 moves downward relative to the spindle 29, disengaging from the ratchet groove of the ratchet wheel 25. The target wheel 27 can then rotate freely clockwise or counterclockwise around the spindle 29 under manual operation, quickly rotating the target rod 19 to the initial position of the spiral guide groove 35 for easy loading of the target 14. The spring 24 allows the pressure rod 23 to return to its original position after being pressed down.

[0061] Preferably, the target guide plate 21 is installed on the inner side of the target drum body 11 near the target outlet 12. The target guide plate 21 is tangent to the outer edge of the target 14 that enters the target outlet 12 along the spiral guide groove 35, and guides the target 14 to be sequentially introduced into the target outlet 12.

[0062] like Figure 4 As shown, the target drum cover 17 and the target drum body 11 are connected by a hinge 18, and the target drum cover 17 and the target drum body 11 are locked together by a buckle 20. An external rotating handle 16 is provided on the outside of the target drum cover 17. After the target drum cover 17 is closed, the external rotating handle 16 engages with the internal rotating handle 15, and applies a spiral spring force to the target drum assembly 34 with the target component loaded at any time from the outside.

[0063] The working process of the present invention includes: the target 14 being loaded into the target drum assembly 34, and the target 14 in the target drum assembly 34 being loaded into the trolley 2.

[0064] The process of loading target 14 into target drum assembly 34 is as follows: When loading target 14, open target drum cover 17, press down pressure rod 23 to separate pawl 26 and ratchet 25, thereby disengaging spindle 29 from target wheel 27. Rotate target wheel 27 clockwise until top target rod 19 is in the starting position of spiral guide groove 35 near spiral spring seat 32, then release pressure rod 23. Place target 14 into target groove of target wheel 27 in the predetermined loading quantity and order along the rotation direction of spiral guide groove 35. Rotate inner handle 15 clockwise to apply pre-spring force to target 14, and target 14 is pushed to the outermost position of target outlet 12 under the action of spiral spring force 31. Check and confirm that all loaded target 14 are neatly arranged. After inspection and approval, close target drum cover 17 and lock buckle 20, tighten outer handle 16 to apply the required remaining spring force.

[0065] The process of loading the target component 14 from the target drum assembly 34 into the trolley 2 is as follows: The target drum assembly 34, filled with the target component 14, is placed and secured to the target drum support 36. The empty trolley 2 is moved to the loading port 22. The "forward" switch of the electric cylinder 33 control circuit is pressed, remotely starting the electric cylinder 33. The electric cylinder spindle 9 pushes the outermost target component 14 from the target outlet 12 into the trolley 2. The "reverse" switch of the electric cylinder 33 control circuit is pressed, retracting the electric cylinder spindle 9 to the initial position. The remaining target components 14 in the target drum assembly 34 enter the outermost position of the target outlet 12 in sequence under the action of the spiral spring 31. Then, the second empty trolley 2 is moved to the loading port 22, and so on, until all the target components 14 are loaded into the trolley 2. The trolley 2 string of target components 14 in the production channel 1 enters the core radiation zone through the wire rope pulled by the winch for short half-life isotope production.

[0066] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A target loading device for producing short-half-life isotopes in heavy water reactors, characterized in that, The device includes a channel (1), an electric cylinder (33), and a target drum assembly (34). One end of the channel (1) leads to the reactor core. The target drum assembly (34) sequentially pushes the loaded target (14) to the target outlet (12). The main shaft (9) of the electric cylinder (33) is coaxially arranged with the target outlet (12). The main shaft (9) is driven to move toward the target outlet (12) to push the target (14) at the target outlet (12) into the channel (1). The target (14) enters the reactor core through the channel (1). The target drum assembly (34) includes a target drum body (11), a central rod (28), a spindle (29), a spiral spring (31), a spiral spring seat (32), a target-shifting wheel (27), and a ratchet mechanism. The central rod (28) is provided on the bottom plate of the target drum body (11). The spindle (29) is sleeved on the central rod (28) and rotates around it. The spindle (29) is connected to the inner end of the spiral spring (31). The spindle (29) is slidably connected to the ratchet mechanism. The spiral spring seat (32) is sleeved on the outer side of the spindle (29) and accommodates the spiral spring (31). The outer end of the spiral spring (31) is fixedly connected to the spiral spring seat (32), and the inner end is fixedly connected to the spindle (29). The ratchet mechanism is connected to the target-shifting wheel (27).

2. The target loading device for producing short-half-life isotopes in heavy water reactors according to claim 1, characterized in that, The ratchet mechanism includes a ratchet (25), a pawl (26), and a pawl spring (30). The pawl spring (30) is sleeved on the central rod (28), and the ratchet (25) is arranged above the pawl spring (30). The ratchet (25) and the pawl (26) are engaged through the pawl spring (30), and the pawl (26) is slidably connected to the spindle (29).

3. The target loading device for producing short-half-life isotopes in heavy water reactors according to claim 2, characterized in that, The upper part of the spindle (29) is provided with a spindle inner hole, and the upper two sides of the spindle inner hole are provided with spindle grooves (37). The pawl (26) slides up and down in the spindle groove (37) by the action of the pawl spring (30) to disengage from or engage the ratchet (25).

4. The target loading device for producing short-half-life isotopes in heavy water reactors according to claim 2, characterized in that, The target wheel (27) is fixedly connected to the ratchet (25) and arranged coaxially.

5. The target loading device for producing short-half-life isotopes in heavy water reactors according to claim 2, characterized in that, The inner hole of the mandrel is threadedly connected to an inner rotating handle (15), the upper end of which is provided with a rotating handle, and the lower end is threadedly connected to the mandrel (29).

6. The target loading device for producing short-half-life isotopes in heavy water reactors according to claim 5, characterized in that, A spring (24) is fitted around the outer periphery of the pressure rod (23), the spring (24) abutting against the inner rotating handle (15), and the lower end of the pressure rod (23) passes through the inner rotating handle (15).

7. The target loading device for producing short-half-life isotopes in heavy water reactors according to claim 6, characterized in that, The top of the inner rotating hand (15) has an inner rotating hand hole for installing the spring (24).

8. The target loading device for producing short-half-life isotopes in heavy water reactors according to claim 5, characterized in that, The target drum body (11) is hinged with a target drum cover (17), and the target drum cover (17) is locked to the target drum body (11) by a buckle.

9. The target loading device for producing short-half-life isotopes in heavy water reactors according to claim 8, characterized in that, The target drum cover (17) is provided with an outer rotating handle (16). When the target drum cover (17) is closed, the outer rotating handle (16) engages with the inner rotating handle (15).

10. The target loading device for producing short-half-life isotopes in heavy water reactors according to claim 1, characterized in that, The target wheel (27) has alternating long and short slots on its surface for axially placing multiple target pieces (14).

11. The target loading device for producing short-half-life isotopes in heavy water reactors according to claim 1, characterized in that, The spiral spring seat (32) is fixed to the base plate.

12. The target loading device for producing short-half-life isotopes in heavy water reactors according to claim 1, characterized in that, The base plate is provided with a spiral guide groove (35). One end of the spiral guide groove (35) starts near the outer side of the coil spring seat (32), and the other end ends at the junction of the target drum body (11) and the target outlet (12). The target (14) enters the target outlet (12) sequentially along the spiral guide groove (35).

13. The target loading device for producing short-half-life isotopes in heavy water reactors according to claim 12, characterized in that, A target guide plate (21) is installed on the inner side of the target drum body (11) near the target outlet (12). The target guide plate (21) is tangent to the outer edge of the target (14) that enters the target outlet (12) along the spiral guide groove (35).

14. The target loading device for producing short-half-life isotopes in heavy water reactors according to claim 13, characterized in that, One end of the top target rod (19) is connected to the target wheel (27) via a spring plate, and the other end is connected to a simulated target of the same size as the target piece (14). The top target rod (19) is located in the spiral guide groove (35).

15. The target loading device for producing short-half-life isotopes in heavy water reactors according to claim 1, characterized in that, One end of the target outlet (12) is fixedly connected to the target drum body (11), and the other end accommodates several target pieces (14) to be pushed out.

16. The target loading device for producing short-half-life isotopes in heavy water reactors according to claim 1, characterized in that, The target drum body (11) has a cylindrical structure.

17. The target loading device for producing short-half-life isotopes in heavy water reactors according to claim 1, characterized in that, The electric cylinder (33) includes a driving pulley (5), a synchronous belt (6), a driven pulley (7), and a motor (8). The output shaft of the motor (8) is connected to the driving pulley (5), and the driven pulley (7) is connected to the main shaft (9). The main shaft (9) is moved forward or backward by the forward and reverse rotation of the motor (8).

18. The target loading device for producing short-half-life isotopes in heavy water reactors according to claim 1, characterized in that, The other end of the channel (1) is connected to the target drive mechanism located on the reactor control platform, and the channel (1) is provided with a loading port (22).

19. The target loading device for producing short-half-life isotopes in heavy water reactors according to claim 18, characterized in that, The target outlet (12) is connected to a sloping groove (13), and the outlet of the sloping groove (13) leads to the loading port (22).

20. The target loading device for producing short-half-life isotopes in heavy water reactors according to claim 1, characterized in that, The channel (1) contains a string of several trolleys (2) that are articulated in sequence.

21. The target loading device for producing short-half-life isotopes in heavy water reactors according to claim 1, characterized in that, The electric cylinder (33) is fixedly installed on the electric cylinder support (3), and the target drum assembly (34) is fixedly installed on the target drum support (36).

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