Negative pressure suction retrieval device

Abstract

The present application relates to the technical field of pebble bed nuclear reactor, and provides a negative pressure suction and recovery device, which comprises a suction assembly, a conveying driving mechanism and a driving swing mechanism, the suction assembly comprises a suction hose and a suction end, the suction end is connected to the end of the suction hose; the conveying driving mechanism comprises a first rack and a conveying driving assembly, the conveying driving assembly is arranged on the first rack and is used for clamping and conveying the suction hose; the driving swing mechanism comprises a second rack, a driving swing assembly and a traction piece, the driving swing assembly is arranged on the second rack, one end of the traction piece is connected with the driving swing assembly, the other end of the traction piece is connected with the suction end, and the traction piece is used for driving the suction end to swing. The negative pressure suction and recovery device provided by the present application can not only disturb the fuel elements stacked to form a stable configuration, but also make the suction end drive the suction hose to bend laterally, so that the suction end can be close to a larger range of fuel elements on the upper surface of the pebble bed, and the recovery efficiency of the fuel elements can be improved.

Description

Technical Field

[0001] This invention relates to the field of pebble bed nuclear reactor technology, and more particularly to a negative pressure suction and recovery device. Background Technology

[0002] In the fuel-related systems of a pebble bed nuclear reactor, there are containers for storing fuel elements in bulk. Each fuel element has an outer diameter of 60 mm and weighs approximately 0.2 kg. A large number of fuel elements are randomly stacked into a pebble bed inside the containers. To remove the fuel elements from the containers, a dedicated fuel negative pressure suction device is used to remove the fuel elements from the storage tanks by negative pressure suction.

[0003] In related technologies, such as Chinese Patent Publication No. CN102280151A, a negative pressure suction device for spent fuel in a pebble bed high-temperature gas-cooled reactor is provided. This device enables remote control of negative pressure suction of spent fuel, effectively prevents gas leakage from the storage tank, facilitates radiation protection during operation, and ensures the personal safety of operators.

[0004] However, when the negative pressure suction device provided by the relevant technology suctions the stacked ball bed, the fuel elements stacked near the nozzle of the suction hose may stack into a stable configuration. The fuel element directly below the nozzle of the suction hose is pressed down by other fuel elements on the side and above, making it impossible to suction the material. At the same time, the fuel elements on the side of the nozzle of the suction hose cannot roll smoothly to the nozzle of the suction hose, resulting in low fuel recovery efficiency. Summary of the Invention

[0005] This invention provides a negative pressure suction and retrieval device to address the aforementioned technical deficiencies in the prior art. The oscillating suction end not only disturbs the fuel elements stacked to form a stable configuration, facilitating the rolling of some fuel elements to the suction end position for suction, but also causes the suction end to laterally bend the suction hose, helping the suction end to approach a larger range of fuel elements on the surface of the ball bed, thereby improving the fuel element retrieval efficiency.

[0006] The present invention provides a negative pressure suction and retrieval device, including a suction component, a conveying drive mechanism and a drive swing mechanism.

[0007] The suction assembly includes a suction hose and a suction end, the suction end being connected to the end of the suction hose; The conveying drive mechanism includes a first frame and a conveying drive assembly, wherein the conveying drive assembly is disposed on the first frame and is used to clamp and convey the suction hose; The driving swing mechanism includes a second frame, a driving swing assembly, and a traction member. The driving swing assembly is disposed on the second frame. One end of the traction member is connected to the driving swing assembly, and the other end of the traction member is connected to the suction end head, for driving the suction end head to swing.

[0008] According to the negative pressure suction and retrieval device provided by the present invention, the driving swing assembly includes a winding component and a pulley group; The winding component is disposed on the second frame; The pulley block includes a movable pulley, a first fixed pulley, and a second fixed pulley. The first fixed pulley and the second fixed pulley are both mounted on the second frame, and the movable pulley is located between the first fixed pulley and the second fixed pulley. One end of the traction member is connected to the winding member, and the other end of the traction member passes around the first fixed pulley, the movable pulley and the second fixed pulley, and is connected to the suction end.

[0009] According to the negative pressure suction and retrieval device provided by the present invention, the driving swing assembly further includes a linear driving component and a counterweight; The movable pulley is fixedly mounted on the counterweight; The linear drive component is located on the second frame and is adapted to drive the counterweight to move, thereby driving the movable pulley to move.

[0010] According to the negative pressure suction and retrieval device provided by the present invention, the linear drive component includes a drive member, a guide member, a lead screw, and a slider; The driving component is disposed on the second frame, the lead screw is connected to the output end of the driving component and is rotatably disposed relative to the second frame, and the guide component is disposed on the second frame and is disposed parallel to the lead screw; The slider is driven by the lead screw and slides with the guide member. The counterweight slides with the guide member and is located below the slider.

[0011] According to the negative pressure suction and retrieval device provided by the present invention, when the suction hose switches from a swinging state to a suspended state, the pulling force on the traction member is greater than or equal to the total weight of the counterweight and the movable pulley.

[0012] According to the negative pressure suction and retrieval device provided by the present invention, the winding component includes a drum and a drum motor, the drum motor is disposed on the second frame, the drum is disposed at the output end of the drum motor, and the traction member is wound around the drum.

[0013] According to the negative pressure suction and retrieval device provided by the present invention, the suction end includes a fixed section, a bearing and a suction nozzle. The fixed section is connected to the suction hose. The suction nozzle is connected to the fixed section through the bearing. The suction nozzle is adapted to rotate around the axis of the fixed section. The suction nozzle is provided with an oblique opening. The oblique opening has an inclination angle greater than or equal to 40°. The traction component is connected to the fixed section.

[0014] According to the negative pressure suction and retrieval device provided by the present invention, the traction component is provided in multiple sets, and the number of the driving swing assembly corresponds one-to-one with the number of the traction component; Multiple sets of the aforementioned traction components are connected to the suction end head, and are adapted to drive the suction end head to swing in different directions.

[0015] The negative pressure suction and retraction device provided by the present invention further includes a control component and a displacement sensor. The displacement sensor is electrically connected to the control component. The displacement sensor is used to detect the displacement information of the traction component and feed the displacement information back to the control component. The control component is used to control the movement of the drive swing component according to the displacement information.

[0016] The negative pressure suction and retraction device provided by the present invention further includes a tension sensor, which is electrically connected to the control component. The tension sensor is used to detect the tension information of the traction component and feed the tension information back to the control component. The control component is used to control the movement of the drive swing component according to the tension information.

[0017] The negative pressure suction and retrieval device provided by this invention, in addition to the suction assembly and the conveying drive mechanism, also includes a drive swing mechanism. The drive swing mechanism comprises a second frame, a drive swing assembly, and a traction member. The drive swing assembly is located on the second frame. One end of the traction member is connected to the drive swing assembly, and the other end is connected to the suction end head, used to drive the suction end head to swing. This configuration allows the suction end head to swing, not only disturbing the fuel elements stacked in a stable configuration, facilitating the rolling of some fuel elements to the suction end head for intake, but also causing the suction end head to laterally bend the suction hose, helping the suction end head to approach a larger area of ​​fuel elements on the surface of the ball bed, thereby improving the fuel element retrieval efficiency. This solves the problem in related technologies where the movement of the suction hose is relatively limited, unable to swing laterally to approach fuel elements at other positions on the surface of the ball bed, resulting in intermittent fuel element retrieval and low retrieval efficiency. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in this 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 some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the negative pressure suction and retrieval device provided in an embodiment of the present invention.

[0020] Figure 2This is a schematic diagram of the structure of the driving swing mechanism in the negative pressure suction and retrieval device provided in the embodiment of the present invention.

[0021] Figure 3 This is a schematic diagram of the suction end of the negative pressure suction and retrieval device provided in an embodiment of the present invention.

[0022] Figure 4 This is a control block diagram of the negative pressure suction and retrieval device provided in an embodiment of the present invention.

[0023] Figure label: 10. Suction assembly; 11. Suction hose; 12. Suction end; 121. Fixing section; 122. Bearing; 123. Suction nozzle; 20. Conveyor drive mechanism; 21. First frame; 22. Guide tube; 30. Drive swing mechanism; 31. Second frame; 32. Drive swing assembly; 321. Winding component; 3211. Drum; 3212. Drum motor; 322. Pulley block; 3221. Movable pulley; 3222. First fixed pulley; 3223. Second fixed pulley; 323. Linear drive component; 3231. Drive component; 3232. Guide component; 3233. Lead screw; 3234. Slider; 324. Counterweight; 33. Traction component; 40. Storage tanks. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0025] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0026] In the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0027] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the embodiments of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0028] Figure 1 This is a schematic diagram of the negative pressure suction and retrieval device provided in an embodiment of the present invention. Figure 2 This is a schematic diagram of the structure of the driving swing mechanism in the negative pressure suction and retrieval device provided in the embodiment of the present invention.

[0029] See Figure 1 and Figure 2 This invention provides a negative pressure suction and retrieval device, which includes a suction component 10, a conveying drive mechanism 20, and a drive swing mechanism 30.

[0030] The suction assembly 10 includes a suction hose 11 and a suction end 12, with the suction end 12 connected to the end of the suction hose 11. The length of the suction hose 11 can be adaptively determined according to the relative position between the delivery drive mechanism 20 and the storage tank 40 to ensure that the suction hose 11 can smoothly remove the fuel element from the storage tank 40.

[0031] The conveying drive mechanism 20 includes a first frame 21, a conveying drive assembly, and a guide tube 22. The conveying drive assembly is located on the first frame 21 and is used to clamp and convey the suction hose 11. The guide tube 22 is located on the first frame 21 and is used to guide the suction hose 11 to the storage tank 40.

[0032] The guide tube 22 can be installed as an integral part or as separate parts. When the guide tube 22 is installed as separate parts, the guide tube 22 includes a loading tube and an insertion tube (not labeled in the figure). The insertion tube is obliquely converged into the loading tube. The loading tube is connected to the insertion tube. The insertion tube guides the suction hose 11 to be inserted into the loading tube. The loading tube guides the suction hose 11 to drive the suction end 12 to extend into the storage tank 40.

[0033] The conveying drive assembly includes a conveying geared motor and a conveying component (not shown in the figure). The conveying component clamps the suction hose 11, and the conveying geared motor drives the conveying component to move in order to convey the suction hose 11. The suction hose 11 and the suction end 12 are sent into the insertion tube, and then inserted into the storage tank 40 through the loading pipe and the opening of the storage tank 40. The suction end 12 is lowered to the upper position close to the ball bed.

[0034] When extracting fuel elements from storage tank 40 using the negative pressure suction and retrieval device, the storage tank 40 can be moved below the loading pipe, with the tank opening and the loading pipe aligned vertically. Part of the suction hose 11 is coiled on a hose turntable, and part of the suction hose 11 and the suction end 12 are placed inside the insertion pipe. The suction hose 11 and suction end 12 are then inserted into the storage tank 40, and the conveying drive assembly is controlled to move.

[0035] Start the blower (such as a Roots vacuum pump) connected to the suction hose 11 to generate a large negative pressure at the suction end 12, and draw the fuel element into the suction hose 11 through the negative pressure, and then deliver it to the designated location through the suction hose 11.

[0036] The drive swing mechanism 30 includes a second frame 31, a drive swing assembly 32, and a traction member 33. The drive swing assembly 32 is located on the second frame 31. One end of the traction member 33 is connected to the drive swing assembly 32, and the other end of the traction member 33 is connected to the suction end head 12. The drive swing assembly 32 drives the traction member 33 to move in and out, thereby causing the traction member 33 to pull the suction end head 12 to swing, thereby disturbing the fuel elements stacked to form a stable configuration. This facilitates the rolling of some fuel elements to the position of the suction end head 12 for suction. In addition, the suction end head 12 causes the suction hose 11 to bend laterally, which helps the suction end head 12 to approach a larger range of fuel elements on the surface of the ball bed.

[0037] It is understood that the negative pressure suction and retrieval device provided in this embodiment of the invention, in addition to the suction assembly 10 and the conveying drive mechanism 20, also includes a drive swing mechanism 30. The drive swing mechanism 30 includes a second frame 31, a drive swing assembly 32, and a traction member 33. The drive swing assembly 32 is located on the second frame 31. One end of the traction member 33 is connected to the drive swing assembly 32, and the other end of the traction member 33 is connected to the suction end head 12, which is used to drive the suction end head 12 to swing. With this configuration, the swing of the suction end head 12 can not only disturb the fuel elements stacked to form a stable configuration, which is beneficial for some fuel elements to roll to the position of the suction end head 12 and be sucked in, but also the suction end head 12 drives the suction hose 11 to bend laterally, which helps the suction end head 12 to approach a larger range of fuel elements on the surface of the ball bed, thereby improving the retrieval efficiency of the fuel elements. This addresses the problem in related technologies where the movement of the suction hose 11 is limited, preventing it from swinging laterally to approach fuel elements at other locations on the surface of the ball bed, resulting in intermittent fuel element retrieval and low retrieval efficiency.

[0038] Continue reading Figure 2 In some embodiments of the present invention, the drive swing assembly 32 includes a winding component 321 and a pulley block 322; the winding component 321 is disposed on the second frame 31; the pulley block 322 includes a movable pulley 3221, a first fixed pulley 3222 and a second fixed pulley 3223, both the first fixed pulley 3222 and the second fixed pulley 3223 are disposed on the second frame 31, and the movable pulley 3221 is located between the first fixed pulley 3222 and the second fixed pulley 3223.

[0039] One end of the traction member 33 is connected to the winding member 321, and the other end of the traction member 33 passes around the first fixed pulley 3222, the movable pulley 3221 and the second fixed pulley 3223, and is connected to the suction end 12.

[0040] The traction component 33 can be a steel wire rope, or it can be made of carbon fiber or other materials to replace the steel wire rope, depending on the working conditions.

[0041] When the suction hose 11 extends downwards, it drives the traction member 33 connected to it to extend downwards simultaneously. The winding component 321 rotates passively to release the traction member 33 synchronously, keeping the traction member 33 taut. When the suction hose 11 retracts upwards, it drives the traction member 33 connected to it to move upwards synchronously to relax. The winding component 321 is linked with the conveying drive assembly to synchronously drive the drum 3211 of the winding component 321 to rotate, so that the traction member 33 is wound around the drum 3211 of the winding component 321, thereby keeping the traction member 33 taut.

[0042] In addition, the rotation of the winding component 321 can actively pull the traction component 33 to drive the suction end 12 to swing, thereby disturbing the fuel elements stacked to form a stable configuration, causing some fuel elements to roll to the position of the suction end 12 and be sucked in. Furthermore, the suction end 12 causes the suction hose 11 to bend laterally, which helps the suction end 12 to approach a larger range of fuel elements on the surface of the ball bed, making it easier to extract fuel elements.

[0043] Continue reading Figure 2 In some embodiments of the present invention, the drive swing assembly 32 further includes a linear drive component 323 and a counterweight 324; the pivot of the movable pulley 3221 is fixed on the counterweight 3234, and the movable pulley 3221 can move linearly with the counterweight 3234; the linear drive component 323 is disposed on the second frame 31 and is adapted to push the counterweight 324 to move so as to drive the movable pulley 3221 to move.

[0044] Essentially, the linear drive component 323 can move in a straight line to drive the position of the counterweight 324 to change, thereby changing the position of the movable pulley 3221 on the counterweight 324 to pull the traction component 33, causing the traction component 33 to drive the suction hose 11 to swing, thereby disturbing the fuel elements stacked to form a stable configuration.

[0045] It is understood that, in the above embodiment, by rotating the winding component 321 to pull the traction component 33 to contract, and causing the suction end 12 to swing, the traction component 33 can move within a large stroke range to adjust the position and swing amplitude of the suction end 12. In other words, the winding component 321 controls the contraction of the traction component 33 to achieve coarse positioning of the suction end 12.

[0046] In this embodiment, the linear drive component 323 moves to change the position of the counterweight 324, thereby changing the position of the movable pulley 3221 on the counterweight 324. This pulls the traction component 33, causing the suction hose 11 to swing. This allows the traction component 33 to move within a small stroke range, adjusting the position and swing amplitude of the suction end 12. In other words, the movement of the linear drive component 323 to change the position of the counterweight 324, thereby changing the position of the movable pulley 3221 on the counterweight 324, enables precise positioning of the suction end 12.

[0047] Continue reading Figure 2 In some embodiments of the present invention, the linear drive component 323 includes a drive member 3231, a guide member 3232, a lead screw 3233, and a slider 3234.

[0048] The drive component 3231 can be a motor, etc. The drive component 3231 is fixed to the second frame 31 by bolts or other structures. The lead screw 3233 is connected to the output end of the drive component 3231 by a coupling or other structures. The lead screw 3233 is rotatably set to the second frame 31 by bearings or other transmission components. The guide component 3232 is fixed to the second frame 31 by a connecting seat. The guide component 3232 is set parallel to the lead screw 3233.

[0049] The slider 3234 is driven by the lead screw 3233, the slider 3234 is slidably engaged with the guide 3232, the counterweight 324 is slidably engaged with the guide 3232, and the counterweight 324 is located below the slider 3234.

[0050] When the drive unit 3231 operates in the forward direction, it drives the slider 3234 to move downward. The slider 3234 contacts and pushes the counterweight 324 and the movable pulley 3221 to move downward, causing the traction unit 33 to retract. The traction unit 33 overcomes part of the self-weight of the suction hose 11 and the suction end 12, causing the suction hose 11 to bend laterally, so that the suction end 12 swings, disturbing the fuel elements stacked to form a stable configuration.

[0051] When the drive component 3231 rotates in the reverse direction, the drive slider 3234 moves upward. The slider 3234 disengages from the counterweight 3234, and the suction hose 11 and suction end 12 recover from the lateral bending state to the suspended state under their own weight. This causes the traction component 33 to extend. The traction component 33 pulls the movable pulley 3221 and the counterweight 3234 to overcome their own weight and move upward until the suction hose 11 returns to the suspended state. The pulling force of the traction component 33 decreases to balance the weight of the counterweight 3234 and the movable pulley 3221.

[0052] In some embodiments of the present invention, when the suction hose 11 switches from a swinging state to a suspended state, the pulling force on the traction member 33 is greater than or equal to the total weight of the counterweight 324 and the movable pulley 3221. This ensures that the suction hose 11 can automatically return from a laterally bent state to a suspended state under its own weight.

[0053] Continue reading Figure 2 In some embodiments of the present invention, the winding component 321 includes a drum 3211 and a drum motor 3212. The drum motor 3212 is disposed on the second frame 31, the drum 3211 is disposed at the output end of the drum motor 3212, and the traction member 33 is wound around the drum 3211.

[0054] When the suction hose 11 extends downward, it drives the traction component 33 connected to it to extend downward as well. The drum motor 3212 operates, driving the drum 3211 to rotate, and simultaneously releasing the traction component 33, so that the traction component 33 remains in a taut state.

[0055] When the suction hose 11 retracts upward, it causes the traction component 33 connected to it to loosen upward. The drum motor 3212 operates, causing the drum 3211 to rotate and synchronously wind the traction component 33, keeping the traction component 33 in a taut state.

[0056] In addition, the winding component 321 can also be other structures such as a winch that can extend or retract the wire rope.

[0057] Figure 3 This is a schematic diagram of the suction end of the negative pressure suction and retrieval device provided in an embodiment of the present invention.

[0058] Continue reading Figure 2 In some embodiments of the present invention, the suction end 12 includes a fixed section 121, a bearing 122, and a suction nozzle 123. The fixed section 121 is connected to the suction hose 11, and the suction nozzle 123 is connected to the fixed section 121 via the bearing 122. The suction nozzle 123 is adapted to rotate around the axis of the fixed section 121 and can rotate flexibly around the axis of the hose. When the suction nozzle 123 contacts the fuel element, the suction nozzle 123 can passively rotate with the orientation of the fuel element, facilitating the smooth entry of the fuel element into the suction nozzle 123, thereby improving the retrieval efficiency.

[0059] The maximum swing amplitude of the suction nozzle 123 is matched with the basic length of the suction hose 11. The specific swing amplitude of the suction nozzle 123 can be flexibly changed each time, so that the suction nozzle 123 swings near the upper surface of the stacked spherical fuel element and continuously sucks fuel elements at different positions.

[0060] The suction nozzle 123 has an angled opening with an inclination angle greater than or equal to 40°. The inclination angle can be 40°, 43°, 45°, or 48°, etc.; preferably, the inclination angle is 45°. The traction member 33 is fixedly connected to the fixed section 121 of the suction end 12.

[0061] Continue reading Figure 2 In some embodiments of the present invention, multiple sets of traction members 33 are provided, and the number of driving swing components 32 corresponds one-to-one with the number of traction members 33; multiple sets of traction members 33 are all connected to the suction end 12, which is suitable for driving the suction end 12 to swing in different directions.

[0062] Essentially, each set of traction components 33 is connected to one side of the suction hose 11, allowing the suction hose 11 to swing on the corresponding side. Multiple traction components 33 can respectively enable the suction hose 11 to swing to multiple side angles to continuously suck fuel elements at different positions, thereby improving the fuel element retrieval efficiency.

[0063] Figure 4 This is a control block diagram of the negative pressure suction and retrieval device provided in an embodiment of the present invention.

[0064] See Figure 4 In some embodiments of the present invention, the negative pressure suction and retraction device further includes a control component and a displacement sensor. The displacement sensor is electrically connected to the control component. The displacement sensor is used to detect the displacement information of the traction member 33 and feed the displacement information back to the control component. The control component is used to control the movement of the drive swing component 32 according to the displacement information to realize the automated control of the negative pressure suction and retraction device.

[0065] The control component can be a controller, etc. Displacement sensors include potentiometer-type displacement sensors, inductive displacement sensors, synchros, capacitive displacement sensors, eddy current displacement sensors, or Hall effect displacement sensors, etc.

[0066] For example, an absolute encoder or rotary transformer can be installed on the drum motor 3212. The displacement information of the traction member 33 can be monitored by the absolute encoder or rotary transformer, thereby controlling the operation of the drum motor 3212 so that the basic length of the traction member 33 is synchronized with the suction hose 11.

[0067] In some embodiments of the present invention, the negative pressure suction and retraction device further includes a tension sensor, which is electrically connected to the control component. The tension sensor is used to detect the tension information of the traction member 33 and feed the tension information back to the control component. The control component is used to control the movement of the drive swing component 32 according to the tension information.

[0068] Essentially, the control component uses the tension of the traction member 33 measured by the tension sensor as feedback to control the operation of the drive member 3231 of the linear drive component 323, so that the traction member 33 is always kept taut to prevent the traction member 33 (such as a wire rope) from being overloaded and damaged.

[0069] In addition, the control component controls the operation of the drive member 3231 of the linear drive component 323 to control the corresponding traction member 33 to retract or release the corresponding incremental length, thereby controlling the swing amplitude of the suction nozzle 123, so as to cooperate with the control program to realize the automated control of the negative pressure suction and retrieval device.

[0070] In addition, a sensor can be installed at the position of the suction nozzle 123. When the suction nozzle 123 extends downward to the upper surface of the stacked spherical fuel element, the control component controls the delivery drive component to stop operating, so that the suction hose 11 stops extending.

[0071] The negative pressure suction and recovery device provided in the embodiments of the present invention can be combined with corresponding analysis and experiments. An automated control program can be used to adaptively adjust the actions of each driving component to control the extension and retraction length of the suction hose 11 and the swing amplitude and corresponding position of the suction nozzle 123, so as to adapt to different stacking heights and random stacking conditions of the ball bed in the storage tank 40 and achieve efficient recovery of fuel elements.

[0072] It should be noted that the negative pressure suction and retrieval device provided in this embodiment of the invention can be equipped with multiple pulleys to extend the length of the traction component 33 (such as a steel wire rope), thereby enabling remote operation and maintenance.

[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A negative pressure suction and recovery device for use in a pebble bed nuclear reactor, for suction and recovery of spherical fuel elements, characterized in that, include: A suction assembly includes a suction hose and a suction end, the suction end being connected to the end of the suction hose; A conveying drive mechanism includes a first frame and a conveying drive assembly, wherein the conveying drive assembly is disposed on the first frame and is used to clamp and convey the suction hose. The driving swing mechanism includes a second frame, a driving swing assembly, and a traction member. The driving swing assembly is disposed on the second frame. One end of the traction member is connected to the driving swing assembly, and the other end of the traction member is connected to the suction end head. It is used to drive the suction end head to swing, thereby disturbing the fuel elements stacked to form a stable configuration, which facilitates the rolling of some fuel elements to the position of the suction end head for suction. The driving swing assembly includes a winding component, a pulley system, a linear drive component, and a counterweight. The winding component is disposed on the second frame; The pulley block includes a movable pulley, a first fixed pulley, and a second fixed pulley. The first fixed pulley and the second fixed pulley are both mounted on the second frame, and the movable pulley is located between the first fixed pulley and the second fixed pulley. One end of the traction member is connected to the winding member, and the other end of the traction member passes around the first fixed pulley, the movable pulley and the second fixed pulley, and is connected to the suction end. The movable pulley is fixedly mounted on the counterweight; The linear drive component is located on the second frame and is adapted to drive the counterweight to move, thereby driving the movable pulley to move.

2. The negative pressure suction and retrieval device according to claim 1, characterized in that, The linear drive component includes a drive element, a guide element, a lead screw, and a slider; The driving component is disposed on the second frame, the lead screw is connected to the output end of the driving component and is rotatably disposed relative to the second frame, and the guide component is disposed on the second frame and is disposed parallel to the lead screw; The slider is driven by the lead screw and slides with the guide member. The counterweight slides with the guide member and is located below the slider.

3. The negative pressure suction and retrieval device according to claim 1, characterized in that, When the suction hose switches from a swinging state to a suspended state, the pulling force on the traction member is greater than or equal to the total weight of the counterweight and the movable pulley.

4. The negative pressure suction and retrieval device according to claim 1, characterized in that, The winding component includes a drum and a drum motor. The drum motor is located on the second frame, and the drum is located at the output end of the drum motor. The traction member is wound around the drum.

5. The negative pressure suction and retrieval device according to claim 1, characterized in that, The suction end includes a fixed section, a bearing, and a suction nozzle. The fixed section is connected to the suction hose, and the suction nozzle is connected to the fixed section through the bearing. The suction nozzle is adapted to rotate around the axis of the fixed section, and the suction nozzle has an oblique opening with an inclination angle greater than or equal to 40°. The traction component is connected to the fixed section.

6. The negative pressure suction and retrieval device according to any one of claims 1 to 5, characterized in that, The traction component is provided in multiple sets, and the number of the driving swing assembly corresponds one-to-one with the number of the traction component; Multiple sets of the aforementioned traction components are connected to the suction end head, and are adapted to drive the suction end head to swing in different directions.

7. The negative pressure suction and retrieval device according to any one of claims 1 to 5, characterized in that, It also includes a control component and a displacement sensor. The displacement sensor is electrically connected to the control component. The displacement sensor is used to detect the displacement information of the traction component and feed the displacement information back to the control component. The control component is used to control the movement of the drive swing component according to the displacement information.

8. The negative pressure suction and retrieval device according to claim 7, characterized in that, It also includes a tension sensor, which is electrically connected to the control component. The tension sensor is used to detect the tension information of the traction component and feed the tension information back to the control component. The control component is used to control the movement of the drive swing component according to the tension information.

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