Microreactor control rod drive mechanism

Abstract

An embodiment of this application provides a microreactor control rod drive mechanism, comprising: a tray with a through hole; a drive motor mounted on one side of the tray; a pulley configured to drive a connecting rope connected to the pulley to move through the through hole under the drive of the drive motor, so that the control rod connected to the connecting rope enters or leaves the reactor to control the working state of the reactor; and a limiting device configured to limit the rotation angle of the pulley, thereby controlling the movement height of the control rod within the reactor.

Description

Technical Field

[0001] At least one embodiment of this application relates to a drive mechanism, specifically a microreactor control rod drive mechanism. Background Technology

[0002] The control rod drive mechanism is a crucial component of the reactor control system. Its primary function is to drive the control rods within the reactor, enabling stable operation at varying neutron flux density levels (power). Miniature neutron source reactors (MNSRs) utilize only a single central control rod for both normal operation and emergency shutdown. This necessitates a control rod drive mechanism capable of controlling the normal movement of the control rods during reactor operation and, in the event of an accident, rapidly inserting the control rods into the core for emergency shutdown.

[0003] Commonly used microreactor control rod drive mechanisms employ AC servo motors (or stepper motors) in conjunction with electromagnetic clutches and reduction gears. This type of drive mechanism has a relatively complex system structure and a certain probability of rod jamming; however, rod jamming is one of the unacceptable failures during reactor operation. Secondly, the servo motor drivers in existing microreactor drive mechanisms are fixed-speed, which, while meeting the rod lifting speed limit, also restricts the speed at which the control rod is inserted into the reactor core. This design leads to inconsistencies in reactor operation behavior, affecting subsequent reactor physics experiments. Summary of the Invention

[0004] In view of the above problems, this application is made in order to provide a microreactor control rod drive mechanism that overcomes or at least partially solves the above problems.

[0005] According to an embodiment of this application, a microreactor control rod drive mechanism is provided, comprising: a tray with a through hole; a drive motor mounted on one side of the tray; a pulley configured to drive a connecting rope connected to the pulley to move through the through hole under the drive of the drive motor, so that the control rod connected to the connecting rope enters or leaves the reactor to control the working state of the reactor; and a limiting device configured to limit the rotation angle of the pulley, thereby controlling the movement height of the control rod within the reactor.

[0006] According to the microreactor control rod drive mechanism provided in the embodiments of this application, a limiting device is set to limit the rotation angle of the rope wheel. This allows the continuous rotation of the rope wheel to be limited by the limiting device while the drive motor controls the rotation of the rope wheel. As a result, the control rod on the connecting rope can be accurately inserted into or removed from the reactor, thereby achieving precise control of the reactor's working state and improving the reactor's safety. Attached Figure Description

[0007] Figure 1This is a perspective view of a drive mechanism according to an embodiment of this application;

[0008] Figure 2 This is a perspective view of a drive mechanism according to another embodiment of this application;

[0009] Figure 3 This is a schematic diagram of a limiting mechanism according to an embodiment of this application;

[0010] Figure 4 This is a schematic diagram of a limiting frame according to an embodiment of this application;

[0011] Figure 5 A schematic diagram showing the connection between the limiting frame and the adjusting mechanism according to an embodiment of this application; and

[0012] Figure 6 This is a schematic diagram of a first bracket and a second bracket according to an embodiment of this application. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only one embodiment of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the described embodiments of this application without creative effort are within the scope of protection of this application.

[0014] It should be noted that, unless otherwise defined, the technical or scientific terms used in this application should have the ordinary meaning understood by a person with ordinary skill in the art to which this application pertains. Where the terms "first," "second," etc., are used throughout the text, they are used only to distinguish similar objects and should not be construed as indicating or implying their relative importance, order of precedence, or implicitly specifying the number of technical features indicated. It should be understood that the data in the descriptions of "first," "second," etc., can be interchanged where appropriate. Where "and / or" appears throughout the text, it means that it includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution that simultaneously satisfies A and B.

[0015] Figure 1 This is a perspective view of a drive mechanism according to an embodiment of this application.

[0016] Embodiments of this application provide a microreactor control rod drive mechanism, such as... Figure 1 As shown, the control rod drive mechanism includes a tray 100, a drive motor 200, a pulley 300, and a limit device 400.

[0017] The tray 100 has a through hole. A drive motor 200 is mounted on one side of the tray 100. A pulley 300 is configured to move a connecting rope connected to the pulley 300 through the through hole under the drive of the drive motor 200, causing a control rod connected to the connecting rope to enter or disengage from the reactor to control the reactor's operating state. A limiting device 400 is configured to limit the rotation angle of the pulley 300, thereby controlling the height of the control rod's movement within the reactor. The tray 100 may refer to a support flange, which is mounted in a fixed position within the reactor control system.

[0018] In this embodiment, during the operation of the microreactor, the drive motor 200 drives the rotation of the pulley 300, allowing the control rods on the connecting rope connected to the pulley 300 to move normally. In the event of an accident in the microreactor requiring the control rods to be inserted into the reactor core to prevent a nuclear reaction, the drive motor 200 can control the pulley 300 to rotate forward, causing the control rods to enter the core. When the pulley 300's rotation is restricted by the limiting device 400, the control rods stop moving, thus enabling the control rods to be accurately moved to a fixed position within the reactor core.

[0019] In this embodiment, when it is necessary to lift the control rod from the reactor core to continue the nuclear reaction, the drive motor 200 drives the pulley 300 to rotate in the opposite direction, so that the connecting rope is wound on the pulley 300, thereby causing the control rod to detach from the reactor core under the lifting action of the connecting rope.

[0020] It should be noted that under normal operating conditions, the rotational speed of the sheave 300 is typically one revolution per minute. However, this does not limit the sheave 300 in this application to the aforementioned rotational speed. Operators can set the speed according to actual needs, and sheaves 300 with different diameters can be used depending on the control rod stroke. The connecting rope in this application can be made of materials that do not react with the reactor or react minimally, such as steel wire rope.

[0021] According to the microreactor control rod drive mechanism provided in the embodiments of this application, by setting a limiting device 400 to limit the rotation angle of the rope wheel 300, the driving motor 200 controls the rotation of the rope wheel 300, and the limiting device 400 restricts the continuous rotation of the rope wheel 300. This allows the control rod on the connecting rope to be accurately inserted into or removed from the reactor, thereby achieving precise control of the reactor's working state, improving reactor safety, and reducing the possibility of reactor safety accidents.

[0022] Figure 2 This is a perspective view of a drive mechanism according to another embodiment of this application.

[0023] In this embodiment, as Figure 2 As shown, the limiting device 400 includes a limiting post 410, a limiting frame 420, and at least two first limiting mechanisms 430.

[0024] A limiting post 410 is installed on the side of the pulley 300 away from the drive motor 200. A limiting frame 420 is installed on the other side of the tray 100, with the limiting post 410 located on the outer edge of the limiting frame 420. At least two first limiting mechanisms 430 are installed on the limiting frame 420, wherein one end of the first limiting mechanism 430 is located at the outer edge of the limiting frame 420, and the first limiting mechanism 430 is configured to control the operating state of the drive motor 200 when the limiting post 410 is in contact with the first limiting mechanism 430.

[0025] In one embodiment, when it is necessary to insert a control rod into the reactor core, the drive motor 200 drives the pulley 300 to rotate forward, so that the connecting rope wound on the pulley 300 gradually detaches from the pulley 300. At this time, the control rod at the end of the connecting rope is inserted into the reactor core as the pulley 300 rotates. When the limiting post 410 on the pulley 300 contacts a first limiting mechanism 430 on the limiting frame 420, the first limiting mechanism 430 controls the drive motor 200 to stop running, thereby stopping the pulley 300 from rotating. Then, the control rod is accurately inserted into the fixed position in the reactor core, so that the nuclear reaction in the reactor is suspended.

[0026] In this alternative embodiment, when it is necessary to detach the control rod from the reactor core, the drive motor 200 drives the pulley 300 to rotate in the opposite direction, so that the free connecting rope is wound around the pulley 300 as it rotates. At this time, the control rod at the end of the connecting rope is detached from the reactor core as the pulley 300 rotates. When the limiting post 410 on the pulley 300 contacts another first limiting mechanism 430 on the limiting frame 420, the first limiting mechanism 430 controls the drive motor 200 to stop running, thereby stopping the pulley 300 from rotating. Then, the control rod is moved to a preset height away from the reactor core, so that the nuclear reaction in the reactor can occur normally.

[0027] In this embodiment, as shown in Figure 2, the drive motor 200 includes a drive motor 210 and a relay 220. The relay 220 is connected to the phase voltage port of the drive motor 210. The relay 220 is used to control the operating state of the drive motor 210, and in the event of a failure of the drive motor 210 or the disconnection of the phase voltage, the control rod is inserted into the reactor in the form of free fall.

[0028] In this embodiment, the drive motor 210 may include an integrated servo motor, which comprises a driver, a controller, and an encoder. Different settings programmed into the controller can control different forward and reverse rotation speeds of the driver, thus achieving asymmetric control of the rod's lifting and lowering speeds. This addresses the issue of inconsistent reactor behavior under different backup reactivity levels, improving the accuracy of subsequent reactor physics experiments. The encoder can serve as a rod position measurement encoder, eliminating the need for a separate rod position measurement circuit and simplifying the control circuit and mechanical structure of the drive motor 210. This integrated servo motor eliminates the need for an electromagnetic clutch, reducing the size of the drive motor 210 and further simplifying its control circuit and mechanical structure.

[0029] In one embodiment, the relay 220 is connected to the phase voltage port of the drive motor 210, so that in the event of a failure of the drive motor 210, the control rod can be inserted into the reactor in a free-fall motion to prevent the nuclear reaction from continuing.

[0030] In another embodiment, relay 220 is connected to the phase voltage port of drive motor 210, and can cut off the phase voltage of drive motor 210 in the event of an emergency shutdown of the reactor, so that control rods can be quickly inserted into the reactor in the form of free fall to prevent the nuclear reaction from continuing.

[0031] Figure 3 This is a schematic diagram of a limiting mechanism according to an embodiment of the present application.

[0032] In this embodiment, as Figure 3 As shown, each first limit mechanism 430 includes a switch body 431 and a lever 432.

[0033] The switch body 431 is mounted on the limiting frame 420; one end of the lever 432 is rotatably in contact with the switch body 431, and the other end of the lever 432 is located at the outer edge of the limiting frame 420. The lever 432 is configured such that when the limiting post 410 is in contact with the other end of the lever 432, the switch body 431 controls the working state of the drive motor 200. The combination of the switch body 431 and the lever 432 can be a limit switch.

[0034] In one embodiment, when it is necessary to insert the control rod into the reactor core, the drive motor 200 drives the pulley 300 to rotate in the forward direction, so that the connecting rope wound on the pulley 300 gradually detaches from the pulley 300. At this time, the control rod at the end of the connecting rope is inserted into the reactor core as the pulley 300 rotates. When the limiting post 410 on the pulley 300 contacts the lever 432 of a first limiting mechanism 430 on the limiting frame 420, the activated lever 432 can cause the switch body 431 to control the drive motor 200 to stop running, thereby stopping the pulley 300 from rotating. Then, the control rod is accurately inserted into the fixed position in the reactor core, so that the nuclear reaction in the reactor is suspended.

[0035] In this alternative embodiment, when it is necessary to detach the control rod from the reactor core, the drive motor 200 drives the pulley 300 to rotate in the opposite direction, so that the free connecting rope is wound around the pulley 300 as it rotates. At this time, the control rod at the end of the connecting rope is detached from the reactor core as the pulley 300 rotates. When the limiting post 410 on the pulley 300 contacts the lever 432 of another first limiting mechanism 430 on the limiting frame 420, the activated lever 432 can cause the switch body 431 to control the drive motor 200 to stop running, thereby stopping the pulley 300 from rotating. Then, the control rod is moved to a preset height away from the reactor core, so that the nuclear reaction in the reactor can occur normally.

[0036] In this embodiment, controlling the movement height of the control rod within the reactor includes the following operations:

[0037] When the limit post 410 is in contact with any lever 432, the switch body 431 sends a control command to the drive motor 200; the drive motor 200 responds to the control command and performs a control operation, wherein the control operation includes pausing the rotation of the drive motor 200.

[0038] In this embodiment, during the operation of the drive motor 200, the limiting post 410 on the rope pulley 300 contacts any lever 432. At this time, the lever 432 transmits an electrical signal to the switch body 431. In response to the electrical signal, the switch body 431 sends a control command to the drive motor 200 to stop running. In response to the control command, the drive motor 200 performs a control operation to pause rotation, thereby allowing the control rod to be accurately inserted into or detached from the reactor.

[0039] In this embodiment, as Figure 3As shown, the limiting device 400 also includes the following operation: a second limiting mechanism 440 is installed at the edge of the acute angle region formed by the two first limiting mechanisms 430 and the limiting frame 420. The second limiting mechanism 440 is configured to limit the position of the limiting post 410 so that the rope wheel 300 stops rotating.

[0040] In one embodiment, when it is necessary to insert a control rod into the reactor core, the drive motor 200 drives the pulley 300 to rotate forward, so that the connecting rope wound on the pulley 300 gradually detaches from the pulley 300. At this time, the control rod at the end of the connecting rope is inserted into the reactor core as the pulley 300 rotates. When the limiting post 410 on the pulley 300 contacts a first limiting mechanism 430, if the first limiting mechanism 430 fails or the drive motor 200 cannot respond to the control command of the first limiting mechanism 430 and stops running, the pulley 300 will continue to rotate. During this process, after the limiting post 410 contacts the first limiting mechanism 430, it contacts the second limiting mechanism 440, so that the rotation of the pulley 300 is terminated under the limiting action of the second limiting mechanism 440, and the control rod is accurately inserted into the fixed position in the reactor core, so that the nuclear reaction in the reactor is suspended.

[0041] In another embodiment, when it is necessary to detach the control rod from the reactor core, the drive motor 200 drives the pulley 300 to rotate in the opposite direction, so that the free connecting rope is wound around the pulley 300 as it rotates. At this time, the control rod at the end of the connecting rope is detached from the reactor core as the pulley 300 rotates. If the limiting post 410 on the pulley 300 contacts another first limiting mechanism 430, the first limiting mechanism 430 may malfunction or the drive motor 200 may not respond to the control command of the first limiting mechanism 430 and stop running. The pulley 300 will continue to rotate. During this process, after the limiting post 410 contacts the first limiting mechanism 430, it contacts the second limiting mechanism 440. Thus, under the limiting action of the second limiting mechanism 440, the rotation of the pulley 300 is terminated, and the control rod is moved to a preset height away from the reactor core, so that the nuclear reaction in the reactor can occur normally.

[0042] In another embodiment, in the event of an emergency, by cutting off the power to the drive motor 200, the control rod is rapidly inserted into the reactor in a free-fall motion to prevent the nuclear reaction from continuing. During this process, since the drive motor 200 and the first limiting mechanism 430 cannot control the height of the control rod, the descent of the control rod can be stopped after the limiting post 410 collides with the second limiting mechanism 440, thereby achieving an emergency shutdown of the reactor.

[0043] In this embodiment, by setting the second limiting mechanism 440, emergency protection can be provided for the operation of the reactor, so as to avoid the failure of the drive motor 210 or the first limiting mechanism 430, or the timely control of the descent height of the control rod in the emergency shutdown state, so as to achieve the effect of emergency shutdown.

[0044] In this embodiment, the second limiting mechanism 440 includes a limiting plate, which is installed at the edge of the acute angle region. The limiting plate is configured such that when the rope wheel 300 rotates, the rope wheel 300 collides with the limiting plate and prevents the rope wheel 300 from rotating further, thereby stopping the control rod connected to the rope of the rope wheel 300 from moving.

[0045] In this embodiment, the limiting plate and the limiting frame 420 are rigidly connected. After the limiting post 410 exceeds the first limiting mechanism 430 and collides rigidly with the second limiting plate, the limiting plate can prevent the rope wheel 300 from rotating further, thereby stopping the control rod connected to the rope wheel 300 from moving. This allows the control rod to be controlled at the position of insertion into the reactor or at the height after it leaves the reactor.

[0046] In this embodiment, the cross-sectional area of ​​the first end of the limiting plate away from the rope wheel 300 is smaller than the cross-sectional area of ​​the second end. The first end is connected to the edge of the rope wheel 300. The different cross-sectional areas at both ends of the limiting plate are suitable for forming an angled region with the limiting frame 420. The angled region is suitable for limiting the limiting post 410 to be restricted within the angled region to prevent further rotation of the rope wheel 300.

[0047] In this embodiment, to prevent the vibration caused by the collision between the limiting post 410 and the limiting plate from causing the drive motor 200 to disengage from its installation position or the limiting post 410 to disengage from the limiting plate and cause damage to the drive mechanism, the limiting plate can be designed as a trapezoid so that after the limiting post 410 collides with the limiting plate, it can be clamped in the angle area formed between the limiting plate and the limiting frame 420, thereby stopping the rotation of the rope wheel 300 and thus accurately controlling the relative position between the control rod and the reactor.

[0048] In this embodiment, the second limiting mechanism 440 limits the position of the limiting post 410 to stop the rope wheel 300 from rotating. This includes the following operations: If the first limiting mechanism 430 malfunctions, after the limiting post 410 contacts the first limiting mechanism 430, the first limiting mechanism 430 does not send control commands to the drive motor 200, allowing the rope wheel 300 to continue rotating; after the limiting post 410 collides with the second limiting mechanism 440, the second limiting mechanism 440 can prevent further rotation of the rope wheel 300, thereby controlling the movement height of the control rod; in this embodiment, in certain situations, such as after the first limiting mechanism 430 has been used for a long time... Or, under the influence of nuclear radiation, the internal parts of the first limiting mechanism 430 may malfunction, causing the first limiting mechanism 430 to fail. In this case, during the movement of the control rod controlled by the drive motor 200, even if the first limiting mechanism 430 comes into contact with the limiting post 410, the first limiting mechanism 430 will not send a control command to the drive motor 200 to stop the rotation of the drive motor 200, thus allowing the drive motor 200 to continue rotating. At this time, as the rope wheel 300 continues to rotate, the limiting post 410 on the rope wheel 300 collides with the second limiting mechanism 440, thereby terminating the rotation of the rope wheel 300 and realizing the control of the height of the control rod relative to the reactor.

[0049] In this embodiment, the second limiting mechanism 440 limits the position of the limiting post 410 so that the rope wheel 300 stops rotating, and also includes the following operations:

[0050] When the drive motor 200 malfunctions and the control rod is inserted into the reactor under gravity, the limiting post 410 contacts the first limiting mechanism 430, and the first limiting mechanism 430 sends a control command to the drive motor 200. The drive motor 200 cannot respond to the control command and stops rotating, so that the rope wheel 300 continues to rotate. After the limiting post 410 collides with the second limiting mechanism 440, the second limiting mechanism 440 prevents the rope wheel 300 from rotating further, thereby controlling the descent height of the control rod.

[0051] In this embodiment, under certain circumstances, such as after the drive motor 200 has been used for a long time or under the irradiation of nuclear radiation, the internal parts of the drive motor 200 may malfunction. In this case, the drive motor 200 may be unable to control the insertion depth of the control rod into the reactor core. Even if the first limiting mechanism 430 sends a control command to the drive motor 200 to stop the rotation after the first limiting mechanism 430 contacts the limiting post 410, the drive motor 200 may not respond to the control command to execute the control operation to stop the rotation. As a result, the rope wheel 300 continues to rotate. After the limiting post 410 on the rope wheel 300 collides with the second limiting mechanism 440, the rotation of the rope wheel 300 is terminated, thereby controlling the descent height of the control rod.

[0052] In this embodiment, the second limiting mechanism 440 limits the position of the limiting post 410 to stop the rope wheel 300 from rotating. The mechanism also includes the following operations: if the drive motor 200 malfunctions and the control rod continues to be withdrawn from the reactor under the rotation of the drive motor 200, after the limiting post 410 contacts the first limiting mechanism 430, the first limiting mechanism 430 sends a control command to the drive motor 200; if the drive motor 200 cannot respond to the control command and stops rotating, the rope wheel 300 continues to rotate; after the limiting post 410 collides with the second limiting mechanism 440, the second limiting mechanism 440 prevents further rotation of the rope wheel 300, thereby controlling the rising height of the control rod.

[0053] In this embodiment, if a component inside the drive motor 200 malfunctions, even if the first limiting mechanism 430 sends a control command to the drive motor 200 to stop its rotation after contacting the limiting post 410, the drive motor 200 will not be able to respond to the control command and execute the control operation to stop its rotation. At this time, the drive motor 200 will drive the rope wheel 300 to continue rotating, causing the control rod to move further away from the core and unable to stop. In this case, the rope wheel 300 will continue to rotate, causing the limiting post 410 to collide with the second limiting mechanism 440, and the rotation of the rope wheel 300 will be terminated, thereby controlling the rising height of the control rod.

[0054] Figure 4 This is a schematic diagram of a limiting frame 420 according to an embodiment of the present application. Figure 5 This is a schematic diagram showing the connection between the limiting frame 420 and the adjusting mechanism 450 according to an embodiment of this application.

[0055] In this embodiment, as Figure 4 and Figure 5 As shown, the limiting frame 420 has at least two arc-shaped grooves 421, and a first limiting mechanism 430 is connected to one arc-shaped groove 421.

[0056] In this embodiment, as Figure 5 As shown, the limiting device 400 also includes at least two adjusting mechanisms 450. Each first limiting mechanism 430 is connected to the arcuate groove 421 of the limiting frame 420 via an adjusting mechanism 450, and the adjusting mechanism 450 is configured to adjust the position of the first limiting mechanism 430 on the limiting frame 420.

[0057] In this embodiment, the maximum rotation angle of the rope wheel 300 is controlled by adjusting the position of the adjustment mechanism 450 in the arc groove 421, thereby adjusting the depth of the control rod inserted into the reactor core or the height of its detachment from the reactor core.

[0058] In one embodiment, the adjustment mechanism 450 includes a first adjustment frame, a first fixing screw, and a fixing nut.

[0059] The first limiting mechanism 430 is installed on the first adjusting frame; the first fixing screw is movably installed in the arc groove 421, and one end of the first fixing screw is connected to the adjusting frame; the fixing nut is set on the side of the limiting frame 420 away from the drive motor 200, and the fixing nut is threadedly connected to the fixing screw.

[0060] In this embodiment, when it is necessary to adjust the maximum rotation angle of the rope wheel 300, the fixing nut can be unscrewed from the first fixing screw, and the position of the first fixing screw in the arc groove 421 can be manually changed. Then, the fixing nut can be tightened on the first fixing screw, so that the first adjusting frame is stably installed on the limiting frame 420, thereby adjusting the position of the first limiting mechanism 430 connected to the adjusting mechanism 450 on the limiting frame 420.

[0061] In another embodiment, such as Figure 5 As shown, the adjustment mechanism 450 includes a second adjustment frame 451, a second fixing screw 452, a pneumatic cylinder or a hydraulic cylinder 453, and a piston rod 454 that extends and retracts longitudinally relative to the pneumatic cylinder or the hydraulic cylinder 453.

[0062] The first limiting mechanism 430 is mounted on the second adjusting frame 451; the second fixing screw 452 is movably mounted in the arc-shaped groove 421, and one end of the second fixing screw 452 is connected to the adjusting frame; the pneumatic cylinder or hydraulic cylinder 453 is rotatably mounted on the side of the limiting frame 420 away from the drive motor 200; the piston rod 454 is rotatably connected to the end of the second fixing screw 452 away from the second adjusting frame 451; when the piston rod 454 extends or retracts longitudinally, the position of the first limiting mechanism 430 on the limiting frame 420 can be changed to change the maximum rotation angle of the rope wheel 300.

[0063] In this embodiment, when it is necessary to adjust the maximum rotation angle of the rope wheel 300, the piston rod 454 of the pneumatic cylinder or hydraulic cylinder 453 can be controlled to extend and retract in the longitudinal direction. As a result, under the action of the piston rod 454, the position of the first fixing screw in the arc groove 421 changes, thereby adjusting the position of the first limiting mechanism 430 connected to the adjusting mechanism 450 on the limiting frame 420.

[0064] In this embodiment, the use of a pneumatic cylinder or hydraulic cylinder 453 can avoid the problem of nuclear radiation exposure caused by manually changing the position of the adjustment mechanism 450, and can largely ensure the health of the staff.

[0065] Figure 6This is a schematic diagram of a first support 500 and a second support 600 according to an embodiment of this application.

[0066] In this embodiment, as Figure 6 As shown, the drive mechanism also includes a first bracket 500 and a second bracket 600.

[0067] The first bracket 500 is suitable for mounting the drive motor 200 on the tray 100 via the first bracket 500; the second bracket 600 is suitable for mounting the limiting frame 420 on the tray 100 via the second bracket 600.

[0068] In this embodiment, in order to securely mount the drive motor 200, the pulley 300, and the limiting device 400 on the tray 100 and prevent shaking during the operation of the drive mechanism, a first bracket 500 and a second bracket 600 can be respectively set on both sides of the tray 100 to reinforce the mounting of the drive motor 200 and the limiting device 400.

[0069] In this embodiment, as Figure 5 and Figure 6 As shown, the limiting frame 420 is provided with a connecting hole, which is configured such that the shaft of the drive motor 200 passes through the rope wheel 300 and is rotatably connected to the connecting hole. The second bracket 600 is also configured to cooperate with the first bracket 500 to jointly support the drive mechanism and the rope wheel 300.

[0070] In this embodiment, in order to further improve the stability of the drive mechanism, a connection hole can be provided on the limiting frame 420. The shaft of the drive motor 200 passes through the rope wheel 300 and is rotatably connected to the connection hole. In this case, the first bracket 500 and the second bracket 600 jointly support the drive motor 200, the rope wheel 300 and the limiting device 400.

[0071] In this embodiment, a bearing can be installed inside the connecting hole, and the connecting hole is connected to the rotating shaft through the bearing to reduce frictional loss between the rotating shaft and the connecting hole.

[0072] In this embodiment, as Figure 6 As shown, the first bracket 500 is provided with a groove, which is suitable for the drive motor 210 to be mounted on the first bracket 500 through the groove.

[0073] In this embodiment, in order to strengthen the connection between the drive motor 200 and the first bracket 500 and to prevent the drive motor 200 from falling off the first bracket 500 due to long-term use of the drive mechanism, a groove can be provided on the first bracket 500 to install the drive motor 200 in the groove.

[0074] In this embodiment, the rope pulley 300 includes a pulley body and a rope groove. The rope groove is circumferentially disposed on the outer edge of the pulley body, and one end of the connecting rope is connected to the inner surface of the rope groove.

[0075] In this embodiment, the drive motor 200 can drive the wheel to rotate. Since the connecting rope is connected to the rope groove, the connecting rope can be stored in the rope groove or gradually detached from the rope groove when the wheel rotates.

[0076] In this embodiment, the inner surface of the rope groove has irregular textures, which are suitable for increasing the friction between the connecting rope and the rope groove.

[0077] In this embodiment, to prevent the connecting rope from slipping on the rope groove and thus affecting the height of the control rod inserted into the core, irregular textures can be provided in the rope groove to enhance the friction between the connecting rope and the rope groove. The textures can match the surface shape of the connecting rope, for example, they can be threaded.

[0078] In this embodiment, the forward rotation angular velocity of the drive motor 200 is different from the reverse rotation angular velocity. The forward rotation of the drive motor 200 is suitable for inserting the control rod into the reactor via the connecting rope, while the reverse rotation of the drive motor 200 is suitable for detaching the control rod from the reactor via the connecting rope.

[0079] In this embodiment, different forward and reverse rotation speeds can achieve asymmetric control rod lifting and lowering speeds, solving the problem of inconsistent reactor operating behavior under different backup reactivity levels, thereby improving the accuracy of subsequent reactor physics experiments. The invention has been described in detail above with reference to the accompanying drawings and embodiments. However, the invention is not limited to the above embodiments, and various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the invention. All content not described in detail in this invention can be achieved using existing technology.

Claims

1. A microreactor control rod drive mechanism, comprising: The tray has a through hole; A drive motor is mounted on one side of the tray; A pulley is configured to move a connecting rope connected to the pulley in the through hole under the drive of the drive motor, so that the control rod connected to the connecting rope enters or leaves the reactor to control the operating state of the reactor. as well as A limiting device is configured to limit the rotation angle of the rope pulley, thereby controlling the height of movement of the control rod within the reactor. The limiting device includes: A limiting post is installed on the side of the rope pulley away from the drive motor; A limiting frame is installed on the other side of the tray, and the limiting post is located on the outer edge of the limiting frame; and At least two first limiting mechanisms are installed on the limiting frame, wherein one end of the first limiting mechanism is located at the outer edge of the limiting frame, and the first limiting mechanism is configured to control the working state of the drive mechanism when the limiting post contacts the first limiting mechanism. When the limiting post comes into contact with the first limiting mechanism, the first limiting mechanism controls the drive motor to stop running, thereby causing the rope wheel to stop rotating; The limiting device further includes: The second limiting mechanism is installed at the edge of the acute angle region formed by the two first limiting mechanisms and the limiting frame. The second limiting mechanism is configured to limit the position of the limiting post so that the rope wheel stops rotating.

2. The driving mechanism according to claim 1, wherein, The drive motor includes: Servo motor; A relay is connected to the phase voltage port of the servo motor. The relay is used to control the operating state of the drive motor and, in the event of a servo motor failure or the interruption of the phase voltage, the control rod is inserted into the reactor in a free-fall motion.

3. The driving mechanism according to claim 1, wherein, Each of the first limiting mechanisms includes: The switch body is mounted on the limiting frame; A lever has one end rotatably in contact with the switch body, and the other end of the lever is located at the outer edge of the limiting frame. The lever is configured such that when the limiting post is in contact with the other end of the lever, the switch body controls the working state of the drive mechanism.

4. The driving mechanism according to claim 3, wherein, The control of the height at which the control rod moves within the reactor includes: When the limiting post contacts either of the levers, the switch body sends a control command to the drive motor; The drive motor responds to the control command and performs a control operation, wherein the control operation includes pausing the rotation of the drive motor.

5. The driving mechanism according to claim 1, wherein, The second limiting mechanism includes a limiting plate installed at the edge of the acute angle region. The limiting plate is configured such that when the rope wheel rotates, the rope wheel collides with the limiting plate and prevents the rope wheel from rotating further, thereby stopping the control rod connected to the rope wheel by the connecting rope.

6. The drive mechanism according to claim 5, wherein, The cross-sectional area of ​​the first end of the limiting plate away from the rope wheel is smaller than the cross-sectional area of ​​the second end. The first end is connected to the edge of the rope wheel. The different cross-sectional areas at both ends of the limiting plate are suitable for forming an angled region with the limiting frame. The angled region is suitable for the limiting post to be restricted within the angled region to prevent further rotation of the rope wheel.

7. The driving mechanism according to claim 1, wherein, The second limiting mechanism limits the position of the limiting post to stop the rope pulley from rotating, including: In the event of a malfunction of the first limiting mechanism, after the limiting post comes into contact with the first limiting mechanism, the first limiting mechanism will not send a control command to the drive motor, causing the rope wheel to continue rotating. After the limiting post collides with the second limiting mechanism, the second limiting mechanism can prevent the rope wheel from rotating further, thereby controlling the movement height of the control rod.

8. The drive mechanism according to claim 7, wherein, The second limiting mechanism limits the position of the limiting post to stop the rope pulley from rotating, and further includes: When the drive motor fails and the control rod is inserted into the reactor under the action of gravity, after the limiting post comes into contact with the first limiting mechanism, the first limiting mechanism sends a control command to the drive motor. The drive motor is unable to respond to the control command to stop its rotation, so that the pulley continues to rotate; After the limiting post collides with the second limiting mechanism, the second limiting mechanism prevents the rope wheel from rotating further, thereby controlling the descent height of the control rod.

9. The drive mechanism according to claim 8, wherein, The second limiting mechanism limits the position of the limiting post to stop the rope pulley from rotating, and further includes: When the drive motor fails, the control rod continues to be withdrawn from the reactor under the rotation of the drive motor. After the limiting post contacts the first limiting mechanism, the first limiting mechanism sends a control command to the drive motor. The drive motor is unable to respond to the control command to stop its rotation, so that the pulley continues to rotate; After the limiting post collides with the second limiting mechanism, the second limiting mechanism prevents the rope wheel from rotating further, thereby controlling the rising height of the control rod.

10. The drive mechanism according to claim 1, wherein, The limiting frame has at least two arc-shaped grooves, and one of the first limiting mechanisms is connected to one of the arc-shaped grooves.

11. The drive mechanism according to claim 10, wherein, The limiting device further includes: At least two adjustment mechanisms, each of the first limiting mechanisms being connected to the arcuate groove of the limiting frame via one of the adjustment mechanisms, the adjustment mechanisms being configured to adjust the position of the first limiting mechanism on the limiting frame.

12. The drive mechanism according to claim 11, wherein, The adjustment mechanism includes: A first adjusting frame, wherein the first limiting mechanism is mounted on the first adjusting frame; A first fixing screw is movably installed in the arc-shaped groove, and one end of the first fixing screw is connected to the adjusting frame; A fixing nut is disposed on the side of the limiting frame away from the drive motor, and the fixing nut is threadedly connected to the fixing screw.

13. The drive mechanism according to claim 11, wherein, The adjustment mechanism includes: The second adjustment frame, on which the first limiting mechanism is mounted; The second fixing screw is movably installed in the arc-shaped groove, and one end of the second fixing screw is connected to the adjusting frame; A pneumatic or hydraulic cylinder is rotatably mounted on the side of the limiting frame away from the drive motor; The piston rod, which extends and retracts longitudinally relative to the pneumatic or hydraulic cylinder, is rotatably connected to the end of the second fixed screw away from the second adjusting frame; When the piston rod extends or retracts longitudinally, the position of the first limiting mechanism on the limiting frame can be changed to change the maximum rotation angle of the rope wheel.

14. The driving mechanism according to claim 1, further comprising: A first bracket is used to mount the drive motor on the tray via the first bracket; The second bracket is adapted to mount the limiting frame on the tray via the second bracket.

15. The drive mechanism according to claim 14, wherein, The limiting frame is provided with a connecting hole, which is configured such that the shaft of the drive motor passes through the rope wheel and is rotatably connected to the connecting hole. The second bracket is also configured to cooperate with the first bracket to jointly support the drive mechanism and the rope wheel.

16. The drive mechanism according to claim 14, wherein, The first bracket is provided with a groove, which is suitable for the drive motor to be mounted on the first bracket through the groove.

17. The drive mechanism according to claim 1, wherein, The sheave includes: Wheel body; A rope groove is circumferentially disposed on the outer edge of the wheel body, and one end of the connecting rope is connected to the inner surface of the rope groove.

18. The drive mechanism according to claim 17, wherein, The inner surface of the rope groove has irregular patterns, which are designed to increase the friction between the connecting rope and the rope groove.

19. The drive mechanism according to claim 1, wherein, The forward rotational angular velocity of the drive motor is different from the reverse rotational angular velocity. The forward rotation of the drive mechanism is suitable for inserting the control rod into the reactor via a connecting rope, and the reverse rotation of the drive motor is suitable for detaching the control rod from the reactor via a connecting rope.

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