A control rod drive mechanism gripper and a gripping method

Abstract

The present invention relates to the technical field of control rod drive mechanism installation tools, and specifically to a control rod drive mechanism grabbing device and grabbing method. The grabbing device includes: an elastic grabbing head; a grabbing core rod, one end of which is connected to the end of the elastic grabbing head away from the grabbing fingers; a locking connecting rod, which is a hollow rod-shaped part, movably sleeved outside the grabbing core rod and the elastic grabbing head, and can move along its own length direction; a connecting sleeve rod, which is a hollow rod-shaped part, movably sleeved outside the locking connecting rod, and the end of the connecting sleeve rod facing the elastic grabbing head can abut against the end face of the control rod drive mechanism connector; wherein, the locking connecting rod can move along its own axis relative to the connecting sleeve rod, and when the locking connecting rod moves toward the elastic grabbing head, a plurality of the grabbing fingers are closed to grab the operating rod in the control rod connecting rod assembly and lift it upward by a set distance. The grabbing method is based on the aforementioned grabbing device.

Description

Technical Field

[0001] The present invention relates to the technical field of control rod drive mechanism installation tools, and in particular to a control rod drive mechanism grabbing and lifting device and a grabbing and lifting method. Background Art

[0002] The control rod drive (CRD) is a component of nuclear reactor equipment used to control nuclear reactions. It precisely controls the position of the control rods, influencing neutron absorption and generation by inserting or withdrawing the rods, thereby controlling the intensity and stability of the nuclear fission reaction. The mover component of a linear motor CRD typically consists of the motor itself, guide rails, a guidance system, and necessary sensors. The mover is responsible for linear motion, and the guide rails and guidance system ensure accurate position control and stability. Therefore, during CRD installation, the mover component must be grasped and lifted.

[0003] However, the existing grasping tool cannot grasp the operating rod in the control rod connecting rod assembly, cannot effectively lift the operating rod upward by a set distance, and is not convenient for installing the mover component of the linear motor control rod drive mechanism. Summary of the Invention

[0004] In response to the technical problem that existing tools cannot grasp the operating rod in the control rod connecting rod assembly, the present invention provides a control rod drive mechanism grasping and lifting device and grasping and lifting method, which can effectively and safely grasp the operating rod in the control rod connecting rod assembly and effectively lift it upward a set distance to facilitate the installation of the mover component of the linear motor control rod drive mechanism.

[0005] The present invention is achieved through the following technical solutions:

[0006] In a first aspect, the present invention provides a control rod drive mechanism grabbing device, comprising: an elastic grab head, one end of which is provided with a plurality of grabbing fingers that can be opened and closed, and can cover the ball head of the control rod drive mechanism operating rod when the plurality of grabbing fingers are closed; a grabbing core rod, one end of which is connected to the end of the elastic grab head away from the grabbing fingers; a locking connecting rod, which is a hollow rod-shaped part, and is movably mounted outside the grabbing core rod and the elastic grab head, and the locking connecting rod can be relative to the grabbing core rod. The core rod moves along its own length direction, and the end of the locking connecting rod facing the elastic gripping head can be inserted into the inner groove of the control rod drive mechanism connecting piece; the connecting sleeve rod is a hollow rod-shaped part, the connecting sleeve rod is movably sleeved outside the locking connecting rod, and the end of the connecting sleeve rod facing the elastic gripping head can abut against the end surface of the control rod drive mechanism connecting piece; wherein, the locking connecting rod can move along its own axis relative to the connecting sleeve rod, and when the locking connecting rod moves toward the elastic gripping head, the plurality of gripping fingers are closed.

[0007] Existing grasping tools are unable to grasp the operating rod in the control rod connecting rod assembly, and are unable to effectively lift the operating rod upward by a set distance, making it inconvenient to install the mover component of the linear motor control rod drive mechanism.

[0008] In view of this, the control rod drive mechanism grasping device provided by the present invention includes an elastic grasping head, a grasping core rod, a locking connecting rod and a connecting sleeve rod. One end of the elastic grasping head is provided with a plurality of grasping fingers that can be opened and closed. When the plurality of grasping fingers are closed, they can cover the ball head of the control rod drive mechanism operating rod. One end of the grasping core rod is connected to the end of the elastic grasping head away from the grasping fingers. The locking connecting rod is a hollow rod-shaped part. The locking connecting rod is movably sleeved outside the grasping core rod and the elastic grasping head. The locking connecting rod can move along its own length direction relative to the grasping core rod, and the end of the locking connecting rod facing the elastic grasping head can be inserted into the inner groove of the control rod drive mechanism connecting piece. The connecting sleeve rod is a hollow rod-shaped part. The connecting sleeve rod is movably sleeved outside the locking connecting rod, and the end of the connecting sleeve rod facing the elastic grasping head can abut against the end surface of the control rod drive mechanism connecting piece, and the locking connecting rod can move along its own axis relative to the connecting sleeve rod. When the locking connecting rod moves toward the elastic grasping head, the plurality of grasping fingers are closed.

[0009] Before use, move the locking connecting rod away from the elastic gripper, opening the gripper fingers of the elastic gripper so that the gripper can fit over the ball head of the CRAD operating rod. Place the end of the connecting sleeve rod facing the elastic gripper against the end surface of the CRAD connecting member. Simultaneously, insert the elastic gripper into the inner groove of the CRAD connecting member, with the end of the elastic gripper contacting the bottom of the inner groove of the CRAD connecting member so that the gripper fits over the ball head of the CRAD operating rod. Then, move the locking connecting rod relative to the lifting core rod and the connecting sleeve rod toward the CRAD connecting member, sliding the locking sleeve over the gripper fingers, closing the gripper fingers and clamping the ball head of the CRAD operating rod. Then, move the lifting core rod away from the CRAD connecting member, raising the CRAD operating rod a predetermined distance and closing the claws in the CRAD connecting rod assembly, thus completing installation of the mover assembly.

[0010] Therefore, the control rod drive mechanism grasping device provided by the present invention can effectively and safely grasp the operating rod in the control rod connecting rod assembly and effectively lift it upward by a set distance to facilitate the installation of the mover component of the linear motor control rod drive mechanism.

[0011] In an optional embodiment of the present application, it further includes a core shaft nut, which is threadedly connected to the other end of the grabbing core rod; wherein, when the core shaft nut abuts against the corresponding end of the locking connecting rod, rotating the core shaft nut can drive the grabbing core rod to move relative to the locking connecting rod in a direction away from the elastic grabbing head, so as to drive the upper end ball head of the operating rod in the control rod connecting rod to lift it upward by a set distance by rotating the core shaft nut, so that the operating rod in the control rod connecting rod can be lifted safely and reliably by a set distance, and the lifting distance of the operating rod in the control rod connecting rod can be accurately controlled.

[0012] In an optional embodiment of the present application, a grabbing screw is provided at one end of the grabbing core rod away from the elastic grabbing head, one end of the grabbing screw is fixedly connected to the grabbing core rod, and the grabbing screw is threadedly connected to the core shaft nut to facilitate threading the grabbing core rod to the core shaft nut.

[0013] In an optional embodiment of the present application, a first limiting groove is provided at one end of the elastic gripping head away from the grabbing fingers, and the first limiting groove extends along the length direction of the elastic gripping head; a locking sleeve is provided at one end of the locking connecting rod, and the locking sleeve is movably mounted outside the elastic gripping head, and the locking sleeve is provided with a first limiting pin, and the first limiting pin is inserted into the first limiting groove.

[0014] On the one hand, it is convenient to close the elastic gripping head through the locking sleeve, and it is convenient to prevent the elastic gripping head and the locking sleeve from rotating relative to each other through the cooperation of the first rotation limiting pin and the first limiting groove, thereby affecting the lifting of the operating rod in the control rod connecting rod. On the other hand, the elastic gripping head is driven to close by the locking sleeve, which can ensure the stability of the closure of the elastic gripping head during the movement, prevent the ball of the operating rod from slipping out of the elastic gripping head, and at the same time reduce the size of the middle part of the locking connecting rod, thereby reducing the size and weight of the entire grabbing and lifting device.

[0015] In an optional embodiment of the present application, a plurality of positioning grooves are provided on the outer periphery of one end of the locking sleeve away from the locking connecting rod, and the plurality of positioning grooves extend along the length direction of the locking sleeve, and the positioning grooves can be clamped outside the boss of the inner groove of the control rod drive mechanism connecting rod, so that the positioning grooves cooperate with the boss of the inner groove of the control rod drive mechanism connecting rod to play a circumferential positioning role for the entire grasping device, and at the same time, the circumferential freedom of the locking connecting rod can be limited to ensure that the locking connecting rod only moves axially when moving axially.

[0016] In an optional embodiment of the present application, a scale is provided at one end of the grabbing core rod away from the elastic grabbing head, the scale extends along one end of the grabbing core rod, and the scale is passed through the middle of the core shaft nut, so that the movement of the elastic grabbing head and the lifting of the operating rod can be judged by the length of the scale extending from the core shaft nut.

[0017] In an optional embodiment of the present application, a resistance support ring is provided at one end of the locking connecting rod, and the resistance support ring is used to resist and support the core shaft nut, so that the core shaft nut resists the resistance support ring when driving the lifting core rod to move, thereby ensuring that the locking connecting rod can provide support force for the lifting of the lifting core rod.

[0018] In an optional embodiment of the present application, a locking threaded sleeve is provided at one end of the locking connecting rod away from the elastic gripping head. The locking threaded sleeve is threadedly connected to the connecting sleeve rod, and the locking threaded sleeve is rotatably sleeved outside the locking connecting rod, so that the locking connecting rod is driven to move toward the operating rod in the control rod connecting rod by rotating the locking threaded sleeve, so that the locking sleeve is sleeved outside the elastic gripping head, ensuring the closed stability of the elastic gripping head during movement and preventing the ball of the operating rod from slipping out of the elastic gripping head.

[0019] In an optional embodiment of the present application, the locking threaded sleeve is adapted to be equipped with a rotating handle to facilitate manual driving of the locking threaded sleeve to rotate.

[0020] In an optional embodiment of the present application, the side wall of the connecting sleeve is provided with a second positioning groove, and the side wall of the locking connecting rod is provided with a second positioning pin adapted to the second positioning groove, so as to avoid relative rotation between the locking connecting rod and the connecting sleeve through the cooperation of the second positioning groove and the second positioning pin, and ensure that the locking connecting rod can synchronously move axially when the locking threaded sleeve is rotated.

[0021] In an optional embodiment of the present application, a top cylinder is provided at one end of the connecting sleeve rod facing the elastic gripping head, and the top cylinder is used to abut against the end face of the control rod drive mechanism connector to perform axial positioning through the top cylinder, so that when the top cylinder contacts the outer end face of the drive mechanism connector, the entire device is lowered into place during use, and at this time the grab hook is also located in the inner groove of the drive mechanism connector and avoids contact with the inner groove.

[0022] In a second aspect, the present invention provides a control rod drive mechanism lifting method, based on the above-mentioned control rod drive mechanism lifting device, comprising the following steps:

[0023] S10, pressing the top cylinder against the end surface of the control rod drive mechanism connector;

[0024] S20, inserting the elastic gripper into the inner groove of the CRDM connector, and placing the end of the elastic gripper against the bottom of the inner groove of the CRDM connector, so that the elastic gripper is positioned outside the ball head of the CRDM operating rod;

[0025] S30, driving the locking connecting rod to move relative to the grabbing core rod and the connecting sleeve rod toward the control rod drive mechanism, and sleeve the locking sleeve onto the elastic grab head, so that the grabbing fingers close and clamp the ball head of the operating rod of the control rod drive mechanism;

[0026] S40: driving the lifting core rod to move in a direction away from the control rod drive mechanism connecting member, so as to drive the control rod drive mechanism operating rod to rise a set distance.

[0027] The control rod drive mechanism grasping and lifting method provided by the present invention is based on the above-mentioned control rod drive mechanism grasping and lifting device. The method first sequentially abuts the top cylinder against the end surface of the control rod drive mechanism connecting member, inserts the elastic grasping head into the inner groove of the control rod drive mechanism connecting member, and abuts the end of the elastic grasping head against the bottom of the inner groove of the control rod drive mechanism connecting member, so that the elastic grasping head is sleeved over the ball head of the control rod drive mechanism operating rod. Then, the locking connecting rod is driven to move relative to the grasping core rod and the connecting sleeve rod toward the control rod drive mechanism, and the locking sleeve is sleeved over the elastic grasping head, so that the grasping fingers close and clamp the ball head of the control rod drive mechanism operating rod. Then, the grasping core rod is driven to move away from the control rod drive mechanism connecting member to drive the control rod drive mechanism operating rod to be lifted a set distance. The method can effectively and safely grasp the operating rod in the control rod connecting rod assembly and effectively lift it upward by the set distance to facilitate the installation of the mover component of the linear motor control rod drive mechanism.

[0028] The present invention has the following advantages and beneficial effects:

[0029] 1. The control rod drive mechanism grabbing device provided by the present invention comprises an elastic grab head, a grab core rod, a locking connecting rod and a connecting sleeve rod, wherein one end of the elastic grab head is provided with a plurality of grabbing fingers that can be opened and closed, and when the plurality of grabbing fingers are closed, the ball head of the control rod drive mechanism operating rod can be covered, and one end of the grab core rod is connected to the end of the elastic grab head away from the grabbing fingers, and the locking connecting rod is a hollow rod-shaped part, which is movably sleeved outside the grab core rod and the elastic grab head, and the locking connecting rod can move relative to the grab core rod along its own length direction, and the end of the locking connecting rod facing the elastic grab head can be inserted into the inner groove of the control rod drive mechanism connecting piece, and the connecting sleeve rod is a hollow rod-shaped part, which is movably sleeved outside the locking connecting rod, and the end of the connecting sleeve rod facing the elastic grab head can abut against the control rod drive mechanism connecting piece. The end face of the connecting piece is provided, and the locking connecting rod can move along its own axis relative to the connecting sleeve rod. When the locking connecting rod moves toward the elastic grasping head, multiple grasping clamping fingers close to drive the locking connecting rod to move relative to the grasping core rod and the connecting sleeve rod toward the control rod drive mechanism for connection, so that the locking sleeve is arranged outside the elastic grasping head, so that the grasping clamping fingers close and clamp the ball head of the control rod drive mechanism operating rod, and then drive the grasping core rod to move in a direction away from the control rod drive mechanism connecting piece to drive the control rod drive mechanism operating rod to lift a set distance, so that the hook claw in the control rod connecting rod assembly is closed, thereby completing the installation of the mover component. Therefore, the operating rod in the control rod connecting rod assembly can be effectively and safely grasped and effectively lifted upward by a set distance, so as to facilitate the installation of the mover component of the linear motor control rod drive mechanism.

[0030] 2. The present invention provides a control rod drive mechanism (CRDM) grabbing and lifting method, based on the aforementioned CRDM grabbing and lifting device. The method first sequentially abuts a top cylinder against an end surface of a CRDM connector, inserts an elastic grab head into an inner groove of the CRDM connector, and abuts an end of the elastic grab head against the bottom of the inner groove of the CRDM connector, so that the elastic grab head is positioned over a ball head of a CRDM operating rod. The method then drives a locking connecting rod relative to a grabbing core rod and a connecting sleeve rod toward the CRDM, whereupon the locking sleeve is positioned over the elastic grab head, causing the grabbing fingers to close and clamp the ball head of the CRDM operating rod. The method then drives the grabbing core rod away from the CRDM connector to lift the CRDM operating rod a set distance. The method effectively and safely grabs the operating rod in the CRDM connecting rod assembly and effectively lifts it upward by the set distance, thereby facilitating installation of a mover component of the linear motor CRDM. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly describes the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and should not be considered as limiting the scope of the present invention. Those skilled in the art can also derive other relevant drawings based on these drawings without inventive effort.

[0032] In the attached figure:

[0033] Figure 1 This is a schematic structural diagram of a control rod drive mechanism grabbing device according to an embodiment of the present invention;

[0034] Figure 2 This is a schematic structural diagram of the driving end of the control rod drive mechanism grabbing device according to an embodiment of the present invention;

[0035] Figure 3 This is a schematic structural diagram of the grabbing end of the grabbing device of the control rod drive mechanism according to an embodiment of the present invention.

[0036] Reference numerals:

[0037] 1-core nut, 2-resistance support ring, 3-connecting shaft, 4-first fixing pin, 5-core front end connecting sleeve, 6-second rotation limiting pin, 7-connecting sleeve rod, 8-locking connecting rod, 9-second fixing pin, 10-outer connecting sleeve, 11-first fixing screw, 12-first rotation limiting pin, 13-locking sleeve, 14-top cylinder, 15-elastic grab head, 16-inner tail end connecting sleeve, 17-middle tail end connecting sleeve, 18-grabbing core rod, 19-outer fixing structure, 20-grabbing screw, 21-locking threaded sleeve, 22-third fixing pin, 23-rotating handle, 24-scale ruler. DETAILED DESCRIPTION

[0038] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Generally, the components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0039] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in the present application without creative work are within the scope of protection of the present application.

[0040] It should be noted that similar reference numerals and letters represent similar items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further defined or explained in subsequent figures. In the absence of conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0041] In the description of the embodiments of the present application, the indicated orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the product of the application is conventionally placed when in use, or are the orientations or positional relationships conventionally understood by those skilled in the art. These are merely for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present application.

[0042] In the description of this application, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0043] It should be noted that the existing grasping tool cannot grasp the operating rod in the control rod connecting rod assembly, cannot effectively lift the operating rod upward by a set distance, and is not convenient for installing the mover component of the linear motor control rod drive mechanism.

[0044] In order to solve the above-mentioned problems, the inventors innovatively designed the following technical solutions, and the specific implementation solutions of this application will be described in detail with reference to the accompanying drawings.

[0045] Example 1

[0046] Combine Figure 1-Figure 3 The present embodiment provides a control rod drive mechanism grabbing device, comprising: an elastic grab head 15, one end of which is provided with a plurality of grabbing fingers that can be opened and closed, and can cover the ball head of the control rod drive mechanism operating rod when the plurality of grabbing fingers are closed; a grabbing core rod 18, one end of which is connected to the end of the elastic grab head 15 away from the grabbing fingers; a locking connecting rod 8, which is a hollow rod-shaped part, and is movably sleeved on the grabbing core rod 18 and the elastic grab head 15, and the locking connecting rod 8 can be relative to the grabbing core rod. The rod 18 moves along its own length, and the end of the locking connecting rod 8 facing the elastic gripping head 15 can be inserted into the inner groove of the control rod drive mechanism connecting piece; the connecting sleeve rod 7, the connecting sleeve rod 7 is a hollow rod-shaped part, and the connecting sleeve rod 7 is movably mounted outside the locking connecting rod 8, and the end of the connecting sleeve rod 7 facing the elastic gripping head 15 can abut against the end surface of the control rod drive mechanism connecting piece; wherein, the locking connecting rod 8 can move along its own axis relative to the connecting sleeve rod 7, and when the locking connecting rod 8 moves toward the elastic gripping head 15, the multiple gripping fingers are closed.

[0047] Recombination Figure 3 It will be appreciated that the elastic gripper 15 is generally provided with three gripping fingers, so that when the elastic gripper 15 is open, it can be smoothly engaged with the ball head of the CRAM operating rod. Furthermore, a gripping cavity is provided on the inner sidewall of the end of each gripping finger for accommodating the ball head of the CRAM operating rod. This allows the gripper finger to grip the rod portion of the CRAM operating rod when closed, ensuring the stability of the gripper 15 gripping the CRAM operating rod. Furthermore, the gripping cavity extends along the length of the gripper finger, allowing the elastic gripper 15 to have axial clearance when gripping the ball head of the CRAM operating rod, thereby ensuring that the elastic gripper 15 can grip the ball head of the CRAM operating rod.

[0048] The axial movement of the grabbing core rod 18 can be achieved by connecting it to a linear drive mechanism, such as by driving the grabbing core rod 18 to move through a cylinder, an electric push rod, etc. In this embodiment, a spindle nut 1 is further included, which is threadedly connected to the other end of the grabbing core rod 18; wherein, when the spindle nut 1 abuts against the end portion corresponding to the locking connecting rod 8, rotating the spindle nut 1 can drive the grabbing core rod 18 to move relative to the locking connecting rod 8 in a direction away from the elastic gripping head 15, so that the upper end ball head of the operating rod in the control rod connecting rod is driven by rotating the spindle nut 1 and lifted upward by a set distance, thereby safely and reliably lifting the operating rod in the control rod connecting rod by the set distance, and accurately controlling the lifting distance of the operating rod in the control rod connecting rod.

[0049] In this regard, combined with Figure 2 In an embodiment, a grabbing screw 20 is provided at one end of the grabbing core rod 18 away from the elastic grabbing head 15, and one end of the grabbing screw 20 is fixedly connected to the grabbing core rod 18, and the grabbing screw 20 is threadedly connected to the core shaft nut 1 to facilitate threading the grabbing core rod 18 to the core shaft nut 1.

[0050] To ensure sufficient rigidity and light weight of the grabbing core rod 18, in this embodiment, the main body of the grabbing core rod 18 is a hollow rod. One end of the main body of the grabbing core rod 18 is connected to the grabbing screw 20 via a connecting sleeve 5 at the front end of the mandrel. To ensure the stability of the connection between the grabbing core rod 18 and the grabbing screw 20, in this embodiment, the main body of the grabbing core rod 18 is threaded, and the connecting sleeve 5 at the front end of the mandrel is connected to the main body of the grabbing core rod 18 via a first fixing pin 4 (typically a cylindrical pin).

[0051] At the same time, the main body of the grabbing core rod 18 is connected to the elastic gripping head 15 via the inner tail end connecting sleeve 16. Specifically, the main body of the grabbing core rod 18 and the inner tail end connecting sleeve 16 are connected by V-shaped butt welding, and the inner tail end connecting sleeve 16 is connected to the elastic gripping head 15 via threads. The inner tail end connecting sleeve 16 and the elastic gripping head 15 are also connected by a fixing pin (usually a cylindrical pin).

[0052] On this basis, a scale ruler 24 is provided at one end of the grabbing core rod 18 away from the elastic grabbing head 15. The scale ruler 24 extends along one end of the grabbing core rod 18, and the scale ruler 24 is passed through the middle of the core shaft nut 1, so that the movement of the elastic grabbing head 15 and the lifting status of the operating rod can be judged by the length of the scale ruler 24 extending out of the core shaft nut 1.

[0053] That is to say, the control rod drive mechanism grabbing device provided in this embodiment has an inner movable component from top to bottom consisting of a scale ruler 24, a core shaft nut 1, a grabbing screw 20, a core shaft front end connecting sleeve 5, a grabbing core rod 18 body, an inner tail end connecting sleeve 16 and an elastic grab head 15.

[0054] Recombination Figure 3 A first limiting groove is provided at one end of the elastic gripping head 15 away from the grabbing finger, and the first limiting groove extends along the length direction of the elastic gripping head 15; a locking sleeve 13 is provided at one end of the locking connecting rod 8, and the locking sleeve 13 is movably sleeved on the outside of the elastic gripping head 15, and the locking sleeve 13 is provided with a first limiting pin 12, and the first limiting pin is inserted in the first limiting groove.

[0055] On the one hand, it is convenient to close the elastic gripping head 15 through the locking sleeve 13, and it is convenient to prevent the elastic gripping head 15 and the locking sleeve 13 from rotating relative to each other through the cooperation of the first rotation-limiting pin 12 and the first limiting groove, thereby affecting the lifting of the operating rod in the control rod connecting rod. On the other hand, the elastic gripping head 15 is driven to close by the locking sleeve 13, which can ensure the stability of the closure of the elastic gripping head 15 during the movement, prevent the ball of the operating rod from slipping out of the elastic gripping head 15, and at the same time reduce the size of the middle part of the locking connecting rod 8, thereby reducing the size and weight of the entire grabbing and lifting device.

[0056] In this embodiment, a plurality of positioning grooves are provided on the outer periphery of one end of the locking sleeve 13 away from the locking connecting rod 8. The plurality of positioning grooves extend along the length direction of the locking sleeve 13, and the positioning grooves can be clamped outside the boss of the inner groove of the control rod drive mechanism connecting rod. Through the cooperation between the positioning grooves and the boss of the inner groove of the control rod drive mechanism connecting rod, the entire grasping device is circumferentially positioned. At the same time, the circumferential freedom of the locking connecting rod 8 can be limited to ensure that the locking connecting rod 8 only moves axially when moving axially.

[0057] Recombination Figure 2 One end of the locking connecting rod 8 is provided with a contact support ring 2, which is used to contact and support the spindle nut 1, so that the spindle nut 1 contacts the contact support ring 2 when driving the grabbing core rod 18 to move, thereby ensuring that the locking connecting rod 8 can provide support force for lifting the grabbing core rod 18. The contact support ring 2 is fixed to the locking connecting rod 8 by a third fixing pin 22.

[0058] Similarly, a locking threaded sleeve 21 is provided at one end of the locking connecting rod 8 away from the elastic gripping head 15. The locking threaded sleeve 21 is threadedly connected to the connecting sleeve rod 7 and is rotatably sleeved outside the locking connecting rod 8. By rotating the locking threaded sleeve 21, the locking connecting rod 8 is driven to move toward the operating rod in the control rod connecting rod, so that the locking sleeve 13 is sleeved outside the elastic gripping head 15, ensuring the stability of the closure of the elastic gripping head 15 during movement and preventing the ball of the operating rod from slipping out of the elastic gripping head 15.

[0059] It can be understood that the locking threaded sleeve 21 is adapted to be equipped with a rotating handle 23 so as to manually drive the locking threaded sleeve 21 to rotate.

[0060] It should be noted that one end of the main body of the locking connecting rod 8 is connected to the locking sleeve 13 via the middle tail end connecting sleeve 17. The other end of the main body of the locking connecting rod 8 is connected to the coupling shaft 3. The contact support ring 2 is fixed to the outside of the coupling shaft 3. At the same time, the locking threaded sleeve 21 is rotatably sleeved on the outside of the coupling shaft 3. Therefore, the control rod drive mechanism lifting device provided in this embodiment has the following layer moving components from top to bottom: the contact support ring 2, the rotating handle 23, the locking threaded sleeve 21, the connecting shaft, the main body of the locking connecting rod 8, the middle tail end connecting sleeve 17, and the locking sleeve 13.

[0061] In this embodiment, the main part of the locking connecting rod 8 is connected to the connecting shaft 3 by V-shaped butt welding, the middle tail end connecting sleeve 17 is connected to the main part of the locking connecting rod 8 by V-shaped butt welding, the main part of the locking connecting rod 8 is connected to the middle tail end connecting sleeve 17 by threads, and an anti-loosening cylindrical pin is installed.

[0062] Furthermore, the side wall of the connecting sleeve 7 is provided with a second positioning groove, and the side wall of the locking connecting rod 8 is provided with a second positioning pin adapted to the second positioning groove, so that the second positioning groove and the second positioning pin cooperate to avoid relative rotation between the locking connecting rod 8 and the connecting sleeve 7, and ensure that when the locking threaded sleeve 21 is rotated, the locking connecting rod 8 can synchronously move axially.

[0063] In addition, in this embodiment, a top tube 14 is provided at one end of the connecting sleeve 7 facing the elastic gripping head 15. The top tube 14 is used to abut against the end surface of the control rod drive mechanism connector, so as to play an axial positioning role. When the top tube 14 contacts the outer end surface of the drive mechanism connector, the entire device is lowered into place during use, and the grab hook is also located in the inner groove of the drive mechanism connector and avoids contact with the inner groove.

[0064] In summary, the control rod drive mechanism grabbing device provided in this embodiment includes an elastic grab head 15, a grab core rod 18, a locking connecting rod 8 and a connecting sleeve rod 7. One end of the elastic grab head 15 is provided with a plurality of grabbing fingers that can be opened and closed. When the plurality of grabbing fingers are closed, the ball head of the control rod drive mechanism operating rod can be covered. One end of the grab core rod 18 is connected to the end of the elastic grab head 15 away from the grabbing fingers. The locking connecting rod 8 is a hollow rod-shaped part. The locking connecting rod 8 is movably sleeved outside the grab core rod 18 and the elastic grab head 15. The locking connecting rod 8 can Relative to the grabbing core rod 18, which moves along its own length direction, and the end of the locking connecting rod 8 facing the elastic gripping head 15 can be inserted into the inner groove of the control rod drive mechanism connector, the connecting sleeve rod 7 is a hollow rod-shaped part, and the connecting sleeve rod 7 is movably sleeved outside the locking connecting rod 8. The end of the connecting sleeve rod 7 facing the elastic gripping head 15 can abut against the end surface of the control rod drive mechanism connector, and the locking connecting rod 8 can move along its own axis relative to the connecting sleeve rod 7. When the locking connecting rod 8 moves toward the elastic gripping head 15, multiple grabbing fingers are closed.

[0065] Before use, move the locking connecting rod 8 away from the elastic gripper 15, causing the gripper fingers of the elastic gripper 15 to open and fit over the ball joint of the CRAM operating rod. Place the end of the connecting sleeve rod 7 facing the elastic gripper 15 against the end surface of the CRAM connector. Simultaneously, insert the elastic gripper 15 into the inner groove of the CRAM connector, with the end of the elastic gripper 15 resting against the bottom of the inner groove of the CRAM connector, so that the elastic gripper 15 fits over the ball joint of the CRAM operating rod. Then, move the locking connecting rod 8 relative to the grabbing core rod 18 and the connecting sleeve rod 7 toward the CRAM, so that the locking sleeve 13 fits over the elastic gripper 15, closing the gripper fingers and clamping the ball joint of the CRAM operating rod. Then, the grabbing core rod 18 is driven to move away from the control rod drive mechanism connection part, so as to drive the control rod drive mechanism operating rod to rise a set distance, so that the claws in the control rod connecting rod assembly are closed, thereby completing the installation of the mover component.

[0066] Therefore, the control rod drive mechanism grasping device provided in this embodiment can effectively and safely grasp the operating rod in the control rod connecting rod assembly and effectively lift it upward by a set distance to facilitate the installation of the mover component of the linear motor control rod drive mechanism.

[0067] Example 2

[0068] This embodiment provides a control rod drive mechanism lifting method, based on the control rod drive mechanism lifting device described in Example 1, including the following steps:

[0069] S10. Place the top tube 14 against the end surface of the control rod drive mechanism connector.

[0070] Specifically, before use, the locking connecting rod 8 is moved away from the elastic gripping head 15 so that the gripping fingers of the elastic gripping head 15 are opened, so that the elastic gripping head 15 can be sleeved outside the ball head of the control rod drive mechanism operating rod.

[0071] When in use, the entire device can be hoisted above the control rod drive mechanism connector by a hoisting tool. When installing the mover component of the linear motor control rod drive mechanism, the lifting device is lowered so that the top tube 14 contacts the end surface of the control rod drive mechanism connector.

[0072] S20. Insert the elastic gripper 15 into the inner groove of the CRDM connector, and place the end of the elastic gripper 15 against the bottom of the inner groove of the CRDM connector, so that the elastic gripper 15 is sleeved outside the ball head of the CRDM operating rod.

[0073] Specifically, when the entire device is suspended above the CRAM connector, the elastic gripper 15 is simultaneously inserted into the inner groove of the CRAM connector. Under the weight of the inner moving assembly, the end of the elastic gripper 15 contacts the bottom of the inner groove of the CRAM connector. At this point, the elastic gripper 15 fits neatly around the ball head of the CRAM operating rod. When lowering the grabbing device, the elastic gripper 15 should be prevented from contacting the sidewalls of the inner groove of the CRAM connector.

[0074] S30, drive the locking connecting rod 8 to move relative to the grabbing core rod 18 and the connecting sleeve rod 7 toward the control rod drive mechanism, and sleeve the locking sleeve 13 onto the elastic grab head 15, so that the grabbing fingers are closed and clamp the ball head of the operating rod of the rod drive mechanism.

[0075] Specifically, after the gripping head assembly is in place, the CRDM connector limits the axial position of the gripping core rod 18 and the connecting sleeve rod 7. At this point, by rotating the locking threaded sleeve 21, the locking connecting rod 8 is moved relative to the gripping core rod 18 and the connecting sleeve rod 7 toward the CRDM, utilizing the principle of a screw pair transmission. The gripping fingers of the elastic gripping head 15 close under the pressure of the locking sleeve 13, thereby clamping the ball head of the CRDM operating rod.

[0076] S40: driving the lifting core rod 18 to move away from the control rod drive mechanism connecting member, so as to drive the control rod drive mechanism operating rod to rise a set distance.

[0077] That is, after the elastic gripper 15 grabs the ball head of the control rod drive mechanism operating rod, the spindle nut 1 is rotated, and the spindle nut 1 first moves a set distance (for a certain type of control rod drive mechanism, the moving distance is 14 mm) to contact the abutment support ring 2. Then, the spindle nut 1 continues to rotate, and the grabbing screw 20 drives the elastic state to move upward. After the elastic gripper 15 moves upward for a period of idle travel (for a certain type of control rod drive mechanism, the moving distance is 4.5 mm), the elastic gripper 15 contacts the upper end ball head of the operating rod in the control rod connecting rod. At this time, the elastic gripper 15 grabs the operating rod in the control rod connecting rod.

[0078] As the spindle nut 1 continues to rotate, the elastic gripper 15 grasps the operating rod and lifts it upward by a set distance (10 mm for some CRADs). The extension of the scale 24 beyond the spindle nut 1 is measured to determine the movement of the elastic gripper 15 and the extent of the operating rod's lift. When the scale 24 extends beyond the spindle nut 1 to the set value (30.5 mm for some CRADs) or when the spindle nut 1 stops rotating, the operating rod is fully lifted.

[0079] Among them, the elastic gripping head 15 moves upward for a certain idle stroke, which means that the upper ball head of the operating rod can move relative to the elastic gripping head 15 by the distance of the changed idle stroke, so that when there is foreign matter in the connection between the top tube 14 and the rod driving mechanism, the elastic gripping head 15 can still clamp the upper ball head of the operating rod.

[0080] The hooks in the control rod connecting rod assembly close, completing the installation of the mover. After the mover is installed, the middle moving assembly moves in the opposite direction to open the hooks. This releases the mandrel nut 1, and the spring in the control rod connecting rod resets the inner moving assembly, completing the reset of the entire control rod drive mechanism connecting rod lifting tool.

[0081] After the operating rod is raised a set distance, the claws in the control rod connecting rod assembly close, completing the installation of the mover. After the mover is installed, the elastic gripper 15 is opened by first locking the connecting rod 8 in the opposite direction. Then, the spindle nut 1 is released, and the spring in the control rod connecting rod resets the gripping mechanism, thus completing the reset of the entire control rod drive mechanism connecting rod gripping mechanism.

[0082] In summary, the CRDM lifting method provided in this embodiment is based on the CRDM lifting device described in Example 1. The method first sequentially involves contacting the top cylinder 14 against the end surface of the CRDM connector, inserting the elastic gripper 15 into the inner groove of the CRDM connector, and contacting the end of the elastic gripper 15 against the bottom of the inner groove of the CRDM connector, so that the elastic gripper 15 fits over the ball head of the CRDM operating rod. The locking connecting rod 8 is then driven relative to the gripper core rod 18 and the connecting sleeve rod 7 to connect to the CRDM, and the locking sleeve 13 is fitted over the elastic gripper 15, so that the gripper fingers close and clamp the ball head of the CRDM operating rod. The gripper core rod 18 is then driven away from the CRDM connector to lift the CRDM operating rod a set distance. This method effectively and safely grips the operating rod in the CRDM connecting rod assembly and effectively lifts it upward by the set distance, facilitating installation of the mover component of the linear motor CRDM.

[0083] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A control rod drive mechanism grabbing device, characterized in that: include: An elastic gripping head (15), wherein one end of the elastic gripping head (15) is provided with a plurality of gripping fingers capable of opening and closing, and can cover the ball head of the control rod drive mechanism operating rod when the plurality of gripping fingers are closed; A grabbing core rod (18), one end of which is connected to an end of the elastic grabbing head (15) away from the grabbing fingers; A locking connecting rod (8), wherein the locking connecting rod (8) is a hollow rod-shaped part, and the locking connecting rod (8) is movably sleeved outside the grabbing core rod (18) and the elastic grab head (15), and the locking connecting rod (8) can move along its own length direction relative to the grabbing core rod (18), and the end of the locking connecting rod (8) facing the elastic grab head (15) can be inserted into the inner groove of the control rod drive mechanism connector; A connecting rod (7), the connecting rod (7) being a hollow rod-shaped part, the connecting rod (7) being movably sleeved outside the locking connecting rod (8), and the end of the connecting rod (7) facing the elastic gripping head (15) being able to abut against the end surface of the control rod drive mechanism connector; The locking connecting rod (8) is capable of moving along its own axis relative to the connecting sleeve rod (7), and when the locking connecting rod (8) moves toward the elastic gripping head (15), the plurality of gripping fingers are closed; It also includes a core shaft nut (1), the core shaft nut (1) being threadedly connected to the other end of the grabbing core rod (18); Wherein, when the core shaft nut (1) contacts the end portion corresponding to the locking connecting rod (8), rotating the core shaft nut (1) can drive the grabbing core rod (18) to move relative to the locking connecting rod (8) in a direction away from the elastic grab head (15).

2. The control rod drive mechanism lifting device according to claim 1, characterized in that: A grabbing screw (20) is provided at one end of the grabbing core rod (18) away from the elastic grabbing head (15), one end of the grabbing screw (20) is fixedly connected to the grabbing core rod (18), and the grabbing screw (20) is screwed to the core shaft nut (1).

3. The control rod drive mechanism lifting device according to claim 1, characterized in that: A first limiting groove is provided at one end of the elastic gripping head (15) away from the gripping fingers, and the first limiting groove extends along the length direction of the elastic gripping head (15); A locking sleeve (13) is provided at one end of the locking connecting rod (8), and the locking sleeve (13) is movably sleeved outside the elastic gripping head (15). The locking sleeve (13) is provided with a first rotation limiting pin (12), and the first rotation limiting pin (12) is inserted into the first limiting groove.

4. The control rod drive mechanism lifting device according to claim 3, characterized in that: A plurality of positioning grooves are provided on the outer periphery of one end of the locking sleeve (13) away from the locking connecting rod (8), the plurality of positioning grooves extending along the length direction of the locking sleeve (13), and the positioning grooves can be clamped outside the boss of the inner groove of the control rod drive mechanism connecting rod.

5. The control rod drive mechanism lifting device according to claim 1, characterized in that: A scale ruler (24) is provided at one end of the grabbing core rod (18) away from the elastic grab head (15), and the scale ruler (24) extends along one end of the grabbing core rod (18), and the scale ruler (24) is passed through the middle of the spindle nut (1).

6. The control rod drive mechanism lifting device according to claim 1, characterized in that: One end of the locking connecting rod (8) is provided with a contact support ring (2), and the contact support ring (2) is used for contacting and supporting the spindle nut (1).

7. The control rod drive mechanism lifting device according to claim 1, characterized in that: A locking threaded sleeve (21) is provided at one end of the locking connecting rod (8) away from the elastic gripping head (15), the locking threaded sleeve (21) is threadedly connected to the connecting sleeve rod (7), and the locking threaded sleeve (21) is rotatably sleeved outside the locking connecting rod (8).

8. The control rod drive mechanism lifting device according to claim 7, characterized in that: The locking threaded sleeve (21) is adapted to be equipped with a rotating handle (23).

9. The control rod drive mechanism lifting device according to any one of claims 1 to 8, characterized in that: The side wall of the connecting sleeve rod (7) is provided with a second positioning groove, and the side wall of the locking connecting rod (8) is provided with a second positioning pin adapted to the second positioning groove.

10. The control rod drive mechanism lifting device according to claim 3, characterized in that: A top cylinder (14) is provided at one end of the connecting sleeve rod (7) facing the elastic gripping head (15), and the top cylinder (14) is used to abut against the end surface of the control rod drive mechanism connector.

11. A method for lifting a control rod drive mechanism, characterized in that: The control rod drive mechanism lifting device according to claim 10 comprises the following steps: S10, pressing the top cylinder (14) against the end surface of the control rod drive mechanism connector; S20, inserting the elastic gripper (15) into the inner groove of the control rod drive mechanism connecting piece, and making the end of the elastic gripper (15) contact the bottom of the inner groove of the control rod drive mechanism connecting piece, so that the elastic gripper (15) is sleeved outside the ball head of the control rod drive mechanism operating rod; S30, driving the locking connecting rod (8) to move relative to the grabbing core rod (18) and the connecting sleeve rod (7) toward the control rod driving mechanism, and sleeve the locking sleeve (13) onto the elastic grab head (15), so that the grabbing clamping fingers are closed and clamp the ball head of the operating rod of the rod driving mechanism; S40, driving the lifting core rod (18) to move in a direction away from the control rod drive mechanism connecting member, so as to drive the control rod drive mechanism operating rod to rise a set distance.

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