Nuclear power station control rod driving device model

Abstract

The invention belongs to the technical field of nuclear power station simulation teaching, and particularly relates to a nuclear power station control rod driving device model. Comprising a packaging shell with a containing space, a driving rod and a control rod driving assembly. The control rod driving assembly is packaged in the containing space, the driving rod movably penetrates through the control rod driving assembly in the vertical direction and can protrude out of the bottom of the packaging shell, and the control rod driving assembly is used for driving the driving rod to move in the vertical direction so as to simulate position switching of a control rod in a reactor core in a reactor. According to the invention, the internal structure and the operation principle of the driving rod driving mechanism of the nuclear power plant can be truly displayed.

Description

Technical Field

[0001] The invention belongs to the technical field of nuclear power plant simulation teaching, and in particular relates to a nuclear power plant control rod driving device model. Background Art

[0002] The control rod drive of a nuclear power plant is a step-by-step lifting mechanism used to lift, insert or keep the control rods in the core in the proper position to achieve reactivity control. Each control rod assembly is operated by a separate control rod drive mechanism, which is located above the pressure vessel. The instructions of the reactor control and protection system are transmitted to the control rod assembly through the control rod drive mechanism to ensure the realization of various functions of the reactor and ensure the important mission of reactor safety.

[0003] However, the current public publicity and training of nuclear power plants is mainly based on static physical displays, multimedia and display panels, which lack the sense of interactive operation between physical objects and people. Therefore, how to provide an interactive drive rod drive device model to truly demonstrate the internal structure and operating principle of the drive rod drive mechanism of a nuclear power plant has become an urgent problem to be solved. Summary of the invention

[0004] The purpose of the present invention is to provide a nuclear power plant control rod drive device model, which can truly display the internal structure and operation principle demonstration of the nuclear power plant drive rod drive mechanism.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] A control rod drive device model of a nuclear power plant comprises a packaging shell with a containing space, a drive rod and a control rod drive assembly; the control rod drive assembly is packaged in the containing space, the drive rod is movably arranged in the control rod drive assembly along a vertical direction and can protrude from the bottom of the packaging shell, and the control rod drive assembly is used to drive the drive rod to move along a vertical direction to simulate the position switching of the control rod in the core of the reactor.

[0007] The packaging shell and the control rod driving assembly are partially cut along the axial obtuse angle to form an observation window of the driving rod, so that the transmission process of the driving rod can be observed through the observation window; the observation window is fan-shaped and is gradually expanded along the radial opening away from the axis.

[0008] The control rod drive assembly comprises a drive unit, a lifting body, a transmission body, a first gripping body, a holding body, a second gripping body and a base which are sequentially arranged in the accommodation space from top to bottom; the lifting body, the transmission body and the holding body are all provided with through holes along the axial direction, and the driving rod is penetrated through each through hole; the lifting body is fixed at the top of the accommodation space, the base is fixed at the bottom of the accommodation space, the holding body is fixed at the middle of the packaging shell, the transmission body and the first gripping body are movable and arranged between the lifting body and the holding body, the second gripping body is movable and arranged between the holding body and the base, and the moving tracks of the first gripping body and the second gripping body relative to the driving rod both have a gripping state in which the driving rod is engaged and gripped to limit the movement of the driving rod, and a loosening state in which the driving rod can move relative to the gripping body; the drive unit is respectively connected to the first gripping body and the second gripping body to respectively drive the two to move along the moving track to switch the states, and the drive unit is also connected to the transmission body to synchronously drive the first gripping body and the transmission body in the gripping state to move axially.

[0009] The transfer body is slidably connected to the inner wall of the packaging shell and has a first position capable of contacting the lifting body and a second position spaced apart from the lifting body; the first grasping body is movably arranged between the retaining body and the transfer body and has a third position located on the upper surface of the retaining body and spaced apart from the lifting body and a fourth position in contact with the lifting body; the second grasping body is movably arranged between the retaining body and the base and has a fifth position movably located on the base and spaced apart from the retaining body and a sixth position in contact with the retaining body; when the first grasping body and the second grasping body are respectively located at the third position and the fifth position, they are in a released state, and when they are located at the fourth position and the sixth position, they are in a grasping state.

[0010] The driving unit includes a first driving member, a second driving member and a third driving member which are respectively arranged on the top surfaces of the transmission body, the first grasping body and the second grasping body. The second driving member and the third driving member are respectively used to drive the first grasping body and the second grasping body to move axially so as to convert the axial movement of the two into a grasping or releasing state of the first grasping body and the second grasping body with the driving rod respectively; the first driving member is used to synchronously drive the first grasping body and the transmission body in the grasping state to move axially.

[0011] The first driving member, the second driving member and the third driving member are respectively first electromagnetic suction cups arranged on the top surfaces of the transmission body, the first grasping body and the second grasping body; the bottom surfaces of the lifting body, the transmission body and the retaining body are provided with second electromagnetic suction cups opposite to the first electromagnetic suction cups, so that they can be adsorbed and connected through the corresponding first electromagnetic suction cups and the second electromagnetic suction cups.

[0012] The lifting body, the transfer body, the first grabbing body, the retaining body and the second grabbing body are cylindrical and are all provided with observation windows, and the section angle of the observation window along the axial part is 120 degrees; an annular groove is provided around the middle part of the transfer body along the axial direction, and a convex column is provided on the inner wall of the packaging shell corresponding to the annular groove, and the convex column extends into the groove to limit the sliding distance of the transfer body.

[0013] The first grabbing body includes a first hook claw connecting piece and a first hook claw assembly. The first hook claw connecting piece is cylindrical and has a plurality of snap-fit ​​openings circumferentially arranged. The first hook claw assembly includes a plurality of first hooks. The first hooks are arranged in one-to-one correspondence with the snap-fit ​​openings and are hinged to the first hook claw connecting piece via a torsion spring. The first hooks can be inserted into the snap-fit ​​openings and abut against the driving rod.

[0014] The second grabbing body includes a second hook claw connecting piece and a second hook claw assembly. The second hook claw connecting piece is cylindrical and has a plurality of snap-fit ​​openings along the circumferential direction. The second hook claw assembly includes a plurality of second hooks. The second hooks are arranged in a one-to-one correspondence with the snap-fit ​​openings and are hinged to the second hook claw connecting piece via a torsion spring. The second hooks can be inserted into the snap-fit ​​openings and slide against the driving rod.

[0015] The driving rod is provided with grooves corresponding to the first hook and the second hook respectively. When the first hook and the second hook are slidably engaged in the grooves, it is in a grasping state. When the first hook and the second hook are separated by the grooves, it is in a releasing state.

[0016] The beneficial effects achieved by the present invention are:

[0017] The present invention can truly demonstrate the internal structure and operation principle of the driving rod driving mechanism of a nuclear power plant by providing an interactive device model. The driving rod is used to simulate the control rod, and the control rod driving assembly is encapsulated in the accommodating space in the packaging shell. The driving rod is movably arranged in the control rod driving assembly along the vertical direction and can protrude from the bottom of the packaging shell. The control rod driving assembly is used to drive the driving rod to move along the vertical direction to simulate the position switching of the control rod in the reactor core. In order to intuitively display the transmission process of each component inside the model and the process of the driving rod simulating the lifting and insertion position switching of the control rod in the reactor core, the packaging shell and the control rod driving assembly are partially cut along the axial obtuse angle to form an observation window for the driving rod, so that the transmission process of the driving rod can be observed through the observation window. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional diagram of an embodiment of a model of a control rod driving device for a nuclear power plant provided by the present invention;

[0019] Figure 2 yes Figure 1 A schematic diagram of the structure of the middle control rod drive assembly and the drive rod;

[0020] Figure 3 yes Figure 2 Side view of . DETAILED DESCRIPTION

[0021] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] The present invention provides a control rod driving device model of a nuclear power plant, comprising a packaging shell with a containing space, a driving rod and a control rod driving assembly; the control rod driving assembly is packaged in the containing space, the driving rod is movably arranged in the control rod driving assembly along a vertical direction and can protrude from the bottom of the packaging shell, and the control rod driving assembly is used to drive the driving rod to move along a vertical direction to simulate the position switching of the control rod in the reactor core;

[0023] The packaging shell and the control rod driving assembly are partially cut along an axial obtuse angle to form an observation window for the driving rod, so that the transmission process of the driving rod can be observed through the observation window.

[0024] Preferably, the observation window is fan-shaped and is gradually expanded along the radial opening away from the axis.

[0025] Preferably, the control rod driving assembly comprises a driving unit, a lifting body, a transfer body, a first grasping body, a holding body, a second grasping body and a base which are sequentially arranged in the accommodation space from top to bottom;

[0026] The lifting body, the transmission body and the retaining body are all provided with through holes along the axial direction, and the driving rod is passed through each of the through holes;

[0027] The lifting body is fixed to the top of the accommodating space, the base is fixed to the bottom of the accommodating space, the holding body is fixed to the middle of the packaging shell, the transmission body and the first grasping body are movable and spaced between the lifting body and the holding body, the second grasping body is movable and spaced between the holding body and the base, and the moving tracks of the first grasping body and the second grasping body relative to the movement of the driving rod both have a grasping state in which the driving rod is engaged and grasped to limit the movement of the driving rod, and a loosening state in which the driving rod can move relative to the grasping body;

[0028] The driving unit is connected to the first grasping body and the second grasping body respectively to drive them to switch states along the active trajectory respectively. The driving unit is also connected to the transmission body to synchronously drive the first grasping body and the transmission body in the grasping state to move axially.

[0029] Preferably, the transmission body is slidably connected to the inner wall of the packaging shell and has a first position capable of contacting the lifting body and a second position spaced apart from the lifting body; the first grasping body is movably arranged between the holding body and the transmission body and has a third position located on the upper surface of the holding body and spaced apart from the lifting body and a fourth position in contact with the lifting body; the second grasping body is movably arranged between the holding body and the base and has a fifth position movably located on the base and spaced apart from the holding body and a sixth position in contact with the holding body;

[0030] When the first grasping body and the second grasping body are located at the third position and the fifth position respectively, they are in a released state, and when they are located at the fourth position and the sixth position, they are in a grasping state.

[0031] Preferably, the driving unit includes a first driving member, a second driving member and a third driving member which are respectively arranged on the top surfaces of the transmission body, the first grasping body and the second grasping body, the second driving member and the third driving member are respectively used to drive the first grasping body and the second grasping body to move axially, so as to convert the axial movement of the two into the grasping or releasing state of the first grasping body and the second grasping body with the driving rod respectively; the first driving member is used to synchronously drive the first grasping body and the transmission body in the grasping state to move axially.

[0032] Preferably, the first driving member, the second driving member and the third driving member are first electromagnet suction cups respectively arranged on the top surfaces of the transmission body, the first grasping body and the second grasping body.

[0033] Preferably, the bottom surfaces of the lifting body, the transfer body and the retaining body are provided with second electromagnet suction cups opposite to the first electromagnet suction cups, so that the first electromagnet suction cups and the second electromagnet suction cups can be adsorbed and connected through the corresponding ones.

[0034] Preferably, the lifting body, the transfer body, the first grabbing body, the retaining body and the second grabbing body are cylindrical and are all provided with observation windows, wherein the section angle of the observation window along the axial part is 120 degrees.

[0035] Preferably, an annular groove is formed around the middle of the transmission body in the axial direction, and a convex column is formed on the inner wall of the packaging shell corresponding to the annular groove, and the convex column extends into the groove to limit the sliding distance of the transmission body.

[0036] Preferably, the first grab body includes a first hook connecting member and a first hook assembly, the first hook connecting member is a column and has a plurality of engaging openings opened along the circumferential direction, the first hook assembly includes a plurality of first hooks, the first hooks are arranged in one-to-one correspondence with the engaging openings and are hinged to the first hook connecting member via a torsion spring, and the first hooks can be inserted into the engaging openings and abut against the driving rod;

[0037] The second gripping body comprises a second hook connecting piece and a second hook assembly, the second hook connecting piece is a column and has a plurality of engaging openings along the circumferential direction, the second hook assembly comprises a plurality of second hooks, the second hooks are arranged one by one corresponding to the engaging openings and are hinged to the first hook connecting piece via a torsion spring, and the first hooks can be inserted into the engaging openings and slide against the driving rod;

[0038] The driving rod is provided with grooves corresponding to the first hook and the second hook, respectively. When the first hook and the second hook are slidably engaged in the grooves, they are in a grasping state. When the first hook and the second hook are separated by the grooves, they are in a releasing state.

[0039] like Figures 1 to 3 As shown, a control rod drive device model of a nuclear power plant includes a packaging shell 100 with a containing space, a drive rod 10, and a control rod drive assembly 200. The control rod drive assembly 200 is packaged in the containing space, and the drive rod 10 is movably arranged in the control rod drive assembly 200 along the vertical direction and can protrude from the bottom of the packaging shell 100. The control rod drive assembly is used to drive the drive rod to move along the vertical direction to simulate the position switching of the control rod in the reactor core. The packaging shell and the control rod drive assembly are partially cut along the axial obtuse angle to form an observation window 300 for the drive rod, so as to observe the transmission process of the drive rod through the observation window.

[0040] By providing an interactive driving device model, the internal structure and operation principle demonstration of the driving rod driving mechanism of a nuclear power plant can be truly demonstrated. Among them, the driving rod is used to simulate the control rod, and the control rod driving assembly is encapsulated in the accommodating space in the packaging shell. The driving rod is movably arranged in the control rod driving assembly along the vertical direction and can protrude from the bottom of the packaging shell. The control rod driving assembly is used to drive the driving rod to move in the vertical direction to simulate the position switching of the control rod in the reactor core. In order to intuitively display the transmission process of each component inside the model and the process of the driving rod simulating the lifting and insertion position switching of the control rod in the core, the packaging shell and the control rod driving assembly are partially cut along the axial obtuse angle to form an observation window for the driving rod, so that the transmission process of the driving rod can be observed through the observation window.

[0041] In this embodiment, the observation window 300 is fan-shaped and is gradually expanded along the radial opening away from the axis. This arrangement can expand the observation area while improving the stability of the structure and avoiding damage to the structure caused by the transmission of the structure.

[0042] It can be understood that the control rod drive assembly 200 includes a drive unit, a lifting body 11, a transmission body 12, a first gripping body 13, a holding body 14, a second gripping body 15 and a base which are sequentially arranged in the accommodation space from top to bottom. The lifting body, the transmission body and the holding body are all provided with through holes along the axial direction, and the drive rod is passed through each of the through holes.

[0043] The lifting body is fixed on the top of the accommodating space, the base is fixed on the bottom of the accommodating space, the retaining body is fixed on the middle of the packaging shell, the transmitting body and the first grasping body are movable and spaced between the lifting body and the retaining body, the second grasping body is movable and spaced between the retaining body and the base, and the movable trajectories of the first grasping body and the second grasping body relative to the movement of the driving rod both have a grasping state in which the driving rod is engaged and grasped to limit the movement of the driving rod, and a loosened state in which the driving rod can move relative to the grasping body.

[0044] The driving unit is connected to the first grasping body and the second grasping body respectively to drive them to switch states along the active trajectory respectively. The driving unit is also connected to the transmission body to synchronously drive the first grasping body and the transmission body in the grasping state to move axially.

[0045] In the above structure, the lifting body, the transmission body, the first grasping body, the retaining body, the second grasping body and the base are partially wrapped and encapsulated in the accommodating space through the driving unit, the lifting body, the transmission body, the first grasping body, the retaining body, the second grasping body and the base, which are sequentially arranged in the accommodating space from top to bottom, wherein the movement of the first grasping body and the second grasping body relative to the driving rod is converted into a corresponding grasping state or releasing state, that is, the grasping or releasing of the driving rod is realized. When it is necessary to drive the driving rod to move up and down and switch the position of the driving rod, the first grasping body and the transmission body are simultaneously driven by the driving unit to move in the same direction, so as to synchronously drive the first grasping body and the transmission body in the grasping state to move axially, thereby realizing the position movement of the driving rod in the grasping state.

[0046] Furthermore, the transmission body is slidably connected to the inner wall of the packaging shell and has a first position capable of contacting the lifting body and a second position spaced from the lifting body, the first grasping body is movably arranged between the holding body and the transmission body and has a third position located on the upper surface of the holding body and spaced from the lifting body and a fourth position in contact with the lifting body, the second grasping body is movably arranged between the holding body and the base and has a fifth position movably located on the base and spaced from the holding body and a sixth position in contact with the holding body. When the first grasping body and the second grasping body are respectively located at the third position and the fifth position, they are in a released state, and when they are located at the fourth position and the sixth position, they are in a grasping state.

[0047] Furthermore, the driving unit includes a first driving member 20, a second driving member 21 and a third driving member which are respectively arranged on the top surfaces of the transmission body, the first grasping body and the second grasping body, the second driving member and the third driving member are respectively used to drive the first grasping body and the second grasping body to move axially so as to convert the axial movement of the two into a grasping or releasing state of the first grasping body and the second grasping body with the driving rod respectively, and the first driving member is used to synchronously drive the first grasping body and the transmission body in the grasping state to move axially.

[0048] As a preferred embodiment, the first driving member 20, the second driving member 21 and the third driving member are first electromagnetic suction cups respectively arranged on the top surfaces of the transmission body, the first grasping body and the second grasping body. Each first electromagnetic suction cup can be attracted to the lower surface of the relative lifting body, the transmission body and the retaining body respectively when powered on, so as to drive the transmission body, the first grasping body and the second grasping body to move respectively, forming a transmission action of the internal structure.

[0049] It can be understood that the bottom surfaces of the lifting body, the transfer body and the retaining body are provided with a second electromagnet suction cup opposite to the first electromagnet suction cup, so that the first electromagnet suction cup and the second electromagnet suction cup can be adsorbed and connected. Compared with the first electromagnet suction cup provided on one side, this arrangement can overcome the technical problem of insufficient adsorption force of the single-sided electromagnet suction cup.

[0050] As a preferred embodiment, the lifting body, the transmission body, the first grabbing body, the holding body and the second grabbing body are cylindrical and are all provided with observation windows, and the axial section angle of the observation windows is 120 degrees, so as to display the internal structure at the maximum angle while maintaining the stability of each transmission structure.

[0051] It can be understood that the transmission body is provided with an annular groove 121 around the middle part along the axial direction, and the inner wall of the packaging shell is provided with a convex column corresponding to the annular groove, and the convex column extends into the annular groove 121 to limit the sliding distance of the transmission body. The reason why the sliding distance of the transmission body needs to be limited, that is, the limit distance of the transmission body along the axial direction is the first position and the second position, is mainly used when the transmission body is in the second position and the first grasping body is not adsorbed and driven (that is, the first grasping body is in the third position), so that the transmission body and the first grasping body can maintain a spaced state, and avoid the transmission body being unable to be spaced from the first grasping body due to its own gravity.

[0052] In this embodiment, the first grabbing body 13 includes a first hook claw connecting member 131 and a first hook claw assembly 120, the first hook claw connecting member 131 is cylindrical and has a plurality of engaging openings 1311 opened in the circumferential direction, the first hook claw assembly 120 includes a plurality of first hooks, the first hooks are arranged in one-to-one correspondence with the engaging openings and are hinged to the first hook claw connecting member via a torsion spring, the first hooks can be passed through the engaging openings and abut against the driving rod.

[0053] The second grabbing body 15 includes a second hook claw connecting piece 151 and a second hook claw assembly 110. The second hook claw connecting piece is cylindrical and has a plurality of snap-fit ​​openings circumferentially formed therein. The second hook claw assembly includes a plurality of second hook claws. The second hook claws are arranged one-to-one in correspondence with the snap-fit ​​openings and are hinged to the first hook claw connecting piece via a torsion spring. The first hook claw can be inserted into the snap-fit ​​openings and slide against the driving rod.

[0054] The circumference of the driving rod is provided with grooves corresponding to the first hook and the second hook, respectively. When the first hook and the second hook are slidably engaged in the grooves, they are in a grasping state, and when the first hook and the second hook are separated by the grooves, they are in a releasing state.

[0055] The application details of the nuclear power plant control rod drive device model are described in detail below.

[0056] like Figure 1-Figure 2 As shown, the first claw assembly 120 can be inserted into the engaging opening at the lower end of the first claw connector 131, and the first claw assembly 120 can be used to grasp the driving rod 10. The second claw 110 is inserted into the engaging opening at the lower end of the second claw connector 151, and the second claw 110 can also be used to grasp the driving rod 10.

[0057] If the driving rod needs to be moved upward, and the first hook assembly 120 does not grasp the driving rod and the second hook assembly 110 grasps the driving rod, the second driving member 21 (first electromagnet suction cup) can be controlled to drive the first hook connection member 13 and the first hook assembly 120 to move upward by a first preset distance (for example, the distance is set to 8.6 mm), so that the first hook assembly 13 can move upward to be inserted into the bottom surface of the adjacent groove to grasp the driving rod. Then, the third driving member is controlled to drive the second hook connection member to move downward by a first preset distance (for example, the distance is set to 8.6 mm), so that the second hook assembly moves downward and separates from the inserted groove to release the driving rod. Then, the first driving member and the second driving member can be controlled to act simultaneously, so that the first driving member drives the transmission body 12 to move upward by a second preset distance (for example, the distance is set to 15.9 mm), and the second driving member drives the first hook connection member and the driving rod to move upward by a second preset distance (for example, the distance is set to 15.9 mm). Finally, the third driving member can be controlled to drive the second hook connecting member together with each second hook to move upward a first preset distance (for example, the distance is set to 8.6 mm), so that the second hook assembly moves upward to engage in the bottom surface of the adjacent groove to grasp the driving rod, and the second driving member can be controlled to drive the first hook connecting member to move downward a first preset distance (for example, the distance is set to 8.6 mm), so that the first hook assembly moves downward to release the driving rod.

[0058] If the driving rod needs to be moved downward, and the first hook assembly does not grasp the driving rod, and the second hook assembly grasps the driving rod, the second driving member can be controlled to drive the first hook connector together with the first hook assembly to move upward by a first preset distance (for example, the distance is set to 8.6 mm), so that the first hook can move upward and snap into the bottom surface of the adjacent groove to grasp the driving rod. Then the third driving member is controlled to drive the second hook connector together with the second hook assembly to move downward by a first preset distance (for example, the distance is set to 8.6 mm), so that the second hook assembly moves downward and separates from the snapped groove to release the driving rod. Then, the first driving member and the second driving member can be controlled to act simultaneously, so that the transmission body drives the first hook connector to move downward by a second preset distance (for example, the distance is set to 15.9 mm), and the clamping suction cup assembly drives the first hook assembly together with the driving rod to move downward by a second preset distance (for example, the distance is set to 15.9 mm). Finally, the third driving member can be controlled to drive the second claw connecting member and the second claw assembly to move upward a first preset distance (for example, the distance is set to 8.6 mm), so that the second claw assembly moves upward to engage in the bottom surface of the adjacent groove to grasp the driving rod, and the second driving member can be controlled to drive the first claw connecting member and the first claw assembly to move downward a first preset distance (for example, the distance is set to 8.6 mm), so that the first claw assembly moves downward to release the driving rod.

[0059] Since the lifting body, the transmission body, the first grasping body, the retaining body and the second grasping body are cylindrical and are all provided with observation windows, the observation windows have an axial section angle of 120 degrees, so that the movement process of the driving rod and the change process of the position of each component can be clearly and intuitively observed, displaying the internal structure at the maximum angle while maintaining the stability of each transmission structure.

Claims

1. A model of a control rod drive device for a nuclear power plant, characterized in that: It includes a packaging shell with a containing space, a driving rod and a control rod driving assembly; the control rod driving assembly is packaged in the containing space, the driving rod is movably arranged in the control rod driving assembly along the vertical direction and can protrude from the bottom of the packaging shell, and the control rod driving assembly is used to drive the driving rod to move along the vertical direction to simulate the position switching of the control rod in the core of the reactor.

2. The nuclear power plant control rod drive device model according to claim 1, characterized in that: The packaging shell and the control rod driving assembly are partially cut along the axial obtuse angle to form an observation window of the driving rod, so that the transmission process of the driving rod can be observed through the observation window; the observation window is fan-shaped and is gradually expanded along the radial opening away from the axis.

3. The nuclear power plant control rod drive device model according to claim 1, characterized in that: The control rod drive assembly comprises a drive unit, a lifting body, a transmission body, a first gripping body, a holding body, a second gripping body and a base which are sequentially arranged in the accommodation space from top to bottom; the lifting body, the transmission body and the holding body are all provided with through holes along the axial direction, and the driving rod is penetrated through each through hole; the lifting body is fixed at the top of the accommodation space, the base is fixed at the bottom of the accommodation space, the holding body is fixed at the middle of the packaging shell, the transmission body and the first gripping body are movable and arranged between the lifting body and the holding body, the second gripping body is movable and arranged between the holding body and the base, and the moving tracks of the first gripping body and the second gripping body relative to the driving rod both have a gripping state in which the driving rod is engaged and gripped to limit the movement of the driving rod, and a loosening state in which the driving rod can move relative to the gripping body; the drive unit is respectively connected to the first gripping body and the second gripping body to respectively drive the two to move along the moving track to switch the states, and the drive unit is also connected to the transmission body to synchronously drive the first gripping body and the transmission body in the gripping state to move axially.

4. The nuclear power plant control rod drive device model according to claim 3, characterized in that: The transfer body is slidably connected to the inner wall of the packaging shell and has a first position capable of contacting the lifting body and a second position spaced apart from the lifting body; the first grasping body is movably arranged between the retaining body and the transfer body and has a third position located on the upper surface of the retaining body and spaced apart from the lifting body and a fourth position in contact with the lifting body; the second grasping body is movably arranged between the retaining body and the base and has a fifth position movably located on the base and spaced apart from the retaining body and a sixth position in contact with the retaining body; when the first grasping body and the second grasping body are respectively located at the third position and the fifth position, they are in a released state, and when they are located at the fourth position and the sixth position, they are in a grasping state.

5. The nuclear power plant control rod drive device model according to claim 3, characterized in that: The driving unit includes a first driving member, a second driving member and a third driving member which are respectively arranged on the top surfaces of the transmission body, the first grasping body and the second grasping body. The second driving member and the third driving member are respectively used to drive the first grasping body and the second grasping body to move axially so as to convert the axial movement of the two into a grasping or releasing state of the first grasping body and the second grasping body with the driving rod respectively; the first driving member is used to synchronously drive the first grasping body and the transmission body in the grasping state to move axially.

6. The nuclear power plant control rod drive device model according to claim 5, characterized in that: The first driving member, the second driving member and the third driving member are respectively first electromagnetic suction cups arranged on the top surfaces of the transmission body, the first grasping body and the second grasping body; the bottom surfaces of the lifting body, the transmission body and the retaining body are provided with second electromagnetic suction cups opposite to the first electromagnetic suction cups, so that they can be adsorbed and connected through the corresponding first electromagnetic suction cups and the second electromagnetic suction cups.

7. The nuclear power plant control rod drive device model according to claim 3, characterized in that: The lifting body, the transfer body, the first grabbing body, the retaining body and the second grabbing body are cylindrical and are all provided with observation windows, and the section angle of the observation window along the axial part is 120 degrees; an annular groove is provided around the middle part of the transfer body along the axial direction, and a convex column is provided on the inner wall of the packaging shell corresponding to the annular groove, and the convex column extends into the groove to limit the sliding distance of the transfer body.

8. The nuclear power plant control rod drive device model according to claim 3, characterized in that: The first grabbing body includes a first hook claw connecting piece and a first hook claw assembly. The first hook claw connecting piece is cylindrical and has a plurality of snap-fit ​​openings circumferentially arranged. The first hook claw assembly includes a plurality of first hooks. The first hooks are arranged in one-to-one correspondence with the snap-fit ​​openings and are hinged to the first hook claw connecting piece via a torsion spring. The first hooks can be inserted into the snap-fit ​​openings and abut against the driving rod.

9. The nuclear power plant control rod drive device model according to claim 3, characterized in that: The second grabbing body includes a second hook claw connecting piece and a second hook claw assembly. The second hook claw connecting piece is cylindrical and has a plurality of snap-fit ​​openings along the circumferential direction. The second hook claw assembly includes a plurality of second hooks. The second hooks are arranged in a one-to-one correspondence with the snap-fit ​​openings and are hinged to the second hook claw connecting piece via a torsion spring. The second hooks can be inserted into the snap-fit ​​openings and slide against the driving rod.

10. The nuclear power plant control rod drive device model according to claims 8 and 9, characterized in that: The driving rod is provided with grooves corresponding to the first hook and the second hook respectively. When the first hook and the second hook are slidably engaged in the grooves, it is in a grasping state. When the first hook and the second hook are separated by the grooves, it is in a releasing state.

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