Nuclear power station refueling machine control rod assembly gripping apparatus

Abstract

The utility model relates to the technical field of nuclear power station refueling machine grippers, in particular to a nuclear power station refueling machine control rod assembly gripper which comprises a sling and an outer shell, an inner sleeve is arranged in the outer shell, the sling is connected to the top of the inner sleeve, elastic tongues are installed on the two sides of the cavity wall of the bottom of the inner sleeve, and the elastic tongues are connected with the sling. And a grabbing head control rod is further arranged in the outer shell, a control rod fixing circular truncated cone is arranged at the top of the grabbing head control rod, a control rod inversely-buckled slidable circular truncated cone is arranged at the bottom of the control rod fixing circular truncated cone, and grabbing heads are installed on the two sides of the bottom of the outer shell correspondingly. The device is simple in structure and flexible to operate, does not fall off or break in the storage and use process, meets the foreign matter prevention requirement of a first-level area, and does not damage a fuel control rod assembly and other mechanisms of a refueling machine. And the transfer work of nuclear fuel control rod assemblies and burnable poison rod assemblies in a nuclear power station unit fuel pool and a reactor core can be better completed.

Description

Technical Field

[0001] The utility model relates to the technical field of grippers for nuclear power plant refueling machines, in particular to a gripper for a control rod assembly of a nuclear power plant refueling machine. Background Art

[0002] The control rod assemblies and combustible poison rod grippers used in the units of existing nuclear power plants are made in Russia or are manufactured using Russian technology and processes. They have a relatively complex structure and high cost. They are cumbersome and complicated to use and have poor flexibility. Therefore, a control rod assembly gripper for a nuclear power plant refueling machine is provided to overcome the shortcomings of the original Russian-made control rod assembly gripper, such as complex structure and high cost. Utility Model Content

[0003] The purpose of the utility model is to provide a control rod assembly gripper for a nuclear power plant refueling machine in view of the defects of the prior art, so as to solve the problems raised by the above-mentioned background technology.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a control rod assembly gripper for a nuclear power plant material exchange machine, comprising a sling and an outer shell, an inner sleeve is provided inside the outer shell, the top of the inner sleeve is connected to the sling, elastic tongues are installed on both sides of the bottom cavity wall of the inner sleeve, a grab head control rod is also provided inside the outer shell, a control rod fixing truncated table is provided on the top of the control rod fixing truncated table, a control rod inverted slidable truncated table is provided on the bottom of the control rod fixing truncated table, and grab heads are respectively installed on both sides of the bottom of the outer shell.

[0005] As a preferred technical solution of the utility model, guide keys are provided on both sides of the outer shell.

[0006] As a preferred technical solution of the utility model, the sling passes through the top of the outer shell and is connected with the inner sleeve.

[0007] As a preferred technical solution of the utility model, the elastic tongue is composed of a tongue body, a spring, a spring sleeve rod and a movable sleeve, the tongue body is welded to the movable sleeve, and the movable sleeve is movably connected to the spring sleeve rod sleeved with a spring.

[0008] As a preferred technical solution of the utility model, the spring sleeve rod is fixed in the bottom cavity wall of the inner sleeve.

[0009] As a preferred technical solution of the utility model, exhaust and drainage holes are provided on the tops of the outer shell and the inner sleeve.

[0010] As a preferred technical solution of the utility model, the grabbing head is connected to the bottom of the outer shell through a connecting shaft.

[0011] Compared with the prior art, the beneficial effects of the utility model are as follows: The utility model utilizes two elastic tongues of the gripper to control two frustums with opposite and equal diameters at the bottom on the control rod of the gripper head (where the top is a fixed frustum with the large bottom facing downwards, and the lower part is a slidable inverted frustum with the large bottom facing upwards on the control rod of the gripper head) to realize the separation and combination between the two elastic tongues of the gripper and the control rod of the gripper head, and to realize the separation and combination between the two gripper heads of the gripper and the gripping ring at the head of the control rod assembly, so as to achieve the purpose of gripping the control rod assembly and transferring and releasing it after gripping.

[0012] The structure of the utility model is simple and the operation is flexible. It will not fall off or break during storage and use, meets the requirements for preventing foreign objects in the first-level area, and will not cause damage to the fuel control rod assembly and other mechanisms of the refueling machine. It can better complete the transfer work of the fuel control rod assembly and the burnable poison rod assembly in the fuel pool and the core of the nuclear power plant unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a schematic structural diagram of the utility model;

[0014] Figure 2 is one of the working state diagrams of the utility model;

[0015] Figure 3 is the second working state diagram of the utility model.

[0016] In the figure: 1, sling; 2, outer housing; 3, inner sleeve; 4, elastic tongue; 5, gripper head control rod; 6, slidable inverted frustum of the control rod; 7, fixed frustum of the control rod; 8, guiding key; 9, gripper head. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] The following describes in detail the preferred embodiments of the utility model with reference to the accompanying drawings, so that the advantages and features of the utility model can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the utility model.

[0018] Embodiment: Please refer to Figure 1 , the utility model provides a technical solution: A gripper for a control rod assembly of a nuclear power plant refueling machine, which is composed of a sling 1, an outer housing 2, an inner sleeve 3, two elastic tongues 4, a gripper head control rod 5, a slidable inverted frustum 6 of the control rod, a fixed frustum 7 of the control rod, a guiding key 8, and two gripper heads 9. Among them, the sling 1 is connected to the inner sleeve 3; the two elastic tongues 4 are arranged in the cavity wall of the inner sleeve 3 as Figure 1 shown, and the working part at the front end of the elastic tongue 4 of the gripper is designed to be arc-shaped, as shown in the A-direction view of the enlarged view in Figure 1 . A part as shown in Figure 1The enlarged view of the two inserted telescopic sleeves shown in the figure has a compression spring on the thin tube exposed outside the thick tube, and the end of the thin tube is fixed on the inner sleeve 3.

[0019] See Figure 1 The outer shell 2 and the inner sleeve 3 of the control rod assembly gripper are both provided with exhaust and drainage holes at the top. Figures 1-3 shown.

[0020] When the working rod of the refueling machine carries the guide sleeve and is in place on the upper tube seat of the fuel assembly, the control rod assembly gripper falls along the guide groove of the guide sleeve. When the bottom end of the outer shell 2 of the gripper is located at the top of the control rod assembly in the fuel assembly and stops falling, the outer protrusions on the two gripping heads 9 of the gripper have been introduced into the lower inner side of the gripping ring of the head of the control rod assembly. At this time, the control rod assembly sling 1 continues to be lowered so that the inner sleeve 3 and the gripper control rod 5 continue to fall in the gripper cavity. When the bottom end of the gripper gripper control rod 5 falls to the root of the two gripper heads 9 of the gripper, the two gripper heads 9 of the gripper are tightened in the gripping ring of the head of the control rod assembly. At this time, the control rod assembly is in a state of being graspable and waiting to be grasped. At this moment, the bottom surface of the large cylindrical part of the gripper gripper control rod 5 just stops falling and sits at the bottom of the inner cavity of the outer shell 2. At this time, the inner sleeve 3 of the gripper continues to fall with the sling 1. When the two elastic tongues 4 set on the inner sleeve 3 slide over the slidable inverted round table 6 on the gripper control rod 5 and reach its lower part, the lower end of the inner sleeve 3 just reaches the bottom of the inner cavity of the outer shell 2 and cannot fall further. At this moment, the large cylindrical bottom surface on the gripper head control rod 5 and the lower end of the inner sleeve 3 are both located at the bottom of the inner cavity of the outer shell 2. Figure 2 . At this time, the refueling machine can detect that there is no tension on the sling 1 of the control rod assembly gripper of the nuclear power plant. At this time, when the refueling machine operator issues an instruction to lift the sling 1, the inner sleeve 3 of the gripper rises together with the sling 1, so that the two elastic tongues 4 of the gripper carry the slidable inverted table 6 on the gripper's gripper head control rod 5 to slide upward along the gripper's gripper head control rod 5. When the slidable inverted table 6 slides to the fixed table 7 on its upper part, it is blocked and stops sliding upward, and at this time, the sling 1 with the inner sleeve 3 is still executing the command to rise. Along with this rising process, the two elastic tongues 4 set in the cavity wall of the inner sleeve 3 are compressed and continue to slide upward. When they cross the joint surface of the two tables, the two elastic tongues 4 of the gripper and the gripper head control rod 5 are separated. When the top of the inner sleeve 3 reaches the top of the inner cavity of the outer shell 2, the control rod assembly gripper is in Figure 3State. At this time, the refueling machine operator can perform the task of grasping the control rod assembly through this control rod assembly gripper. After the control rod assembly gripper grasps and transfers the control rod assembly to the destination and positions it, the refueling machine operator can command the sling 1 to fall. When the two elastic tongues 4 on the inner sleeve 3 connected to it slide past the fixed round table 7 at the top of the control rod 5 of the gripper head, the refueling machine operator commands the sling 1 to stop falling, and then commands the sling 1 to lift upward. At this time, the inner sleeve 3 is stuck below the bottom opening of the fixed round table 7 at the top of the control rod 5 of the gripper head through the two elastic tongues 4 provided on it, so that the control rod 5 of the gripper head of the gripper rises with it. When the top end of the inner sleeve 3 reaches the top of the inner cavity of the outer casing 2, the control rod 5 of the gripper head of the gripper has completely separated from the two gripper heads 9 of the gripper. The continuously rising sling 1 drives the entire control rod assembly gripper to separate from the control rod assembly and then retracts to the transportation position inside the working rod of the refueling machine through the guide sleeve, so that the control rod assembly gripper of the nuclear power plant returns to Figure 1 the initial state before work. At this time, the control rod assembly gripper of the nuclear power plant has completed a complete working process of grasping, transferring, and releasing the control rod assembly.

[0021] The utility model provides a control rod assembly gripper for a nuclear power plant refueling machine, which has a simple structure, is flexible and easy to use, and has a low cost, meeting the concept of the gradual localization of nuclear power plant equipment production and operation. It can better serve the grasping and transfer work of the control rod assembly and the burnable poison rod assembly of the nuclear power plant unit.

[0022] During the working process of the utility model, the control rod assembly and the burnable poison rod assembly will neither fall off nor cause harm to the fuel control rod assembly and other mechanisms of the refueling machine. The control rod assembly gripper will not have the phenomenon of falling off or breaking during storage and use, meeting the requirements for preventing foreign objects in the first-level area.

[0023] The above embodiments only express the implementation modes of the utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the utility model, several deformations and improvements can still be made, and these all belong to the protection scope of the utility model.

Claims

1. A grapple for a control rod assembly of a nuclear power plant refueling machine, comprising a sling (1) and an outer housing (2), characterized in that: An inner sleeve (3) is provided inside the outer shell (2), a sling (1) is connected to the top of the inner sleeve (3), elastic tongues (4) are installed on both sides of the bottom cavity wall of the inner sleeve (3), a grab head control rod (5) is also provided inside the outer shell (2), a control rod fixing truncated table (7) is provided on the top of the control rod fixing truncated table (7), a control rod inverted slidable truncated table (6) is provided on the bottom of the control rod fixing truncated table (7), and grab heads (9) are installed on both sides of the bottom of the outer shell (2).

2. The grapple of the control rod assembly of a nuclear power plant refueling machine according to claim 1, characterized in that: Guide keys (8) are provided on both sides of the outer shell (2).

3. The grapple of the control rod assembly of a nuclear power plant refueling machine according to claim 1, characterized in that: The sling (1) passes through the top of the outer shell (2) and is connected to the inner sleeve (3).

4. A grapple for a control rod assembly of a nuclear power plant refueling machine according to claim 1, characterized in that: The elastic tongue (4) is composed of a tongue body, a spring, a spring sleeve rod and a movable sleeve. The tongue body is welded to the movable sleeve, and the movable sleeve is movably connected to the spring sleeve rod sleeved with the spring.

5. A grapple for a control rod assembly of a nuclear power plant refueling machine according to claim 4, characterized in that: The spring sleeve rod is fixed in the bottom cavity wall of the inner sleeve (3).

6. The grapple of the control rod assembly of a nuclear power plant refueling machine according to claim 1, characterized in that: The tops of the outer shell (2) and the inner sleeve (3) are both provided with exhaust and drainage holes.

7. A grapple for a control rod assembly of a nuclear power plant refueling machine according to claim 1, characterized in that: The grabbing head (9) is connected to the bottom of the outer shell (2) via a connecting shaft.

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