A fuel assembly grab integrated test device for a nuclear power plant charging and discharging machine

Abstract

The application belongs to the technical field of mechanical design, and particularly relates to a fuel assembly grab integrated test device of a nuclear power plant loading and unloading machine. In the application, the support frame is formed by welding a plurality of steel pipes, and includes upper and lower parts. The upper part is used for fixing a cylinder, and the lower part is used for realizing the grabbing of the fuel assembly of the loading and unloading machine. The bottom of the cylinder is connected with the grab link through a first compression nut. The upper end air inlet of the cylinder is connected with the grab engagement cavity air pipe. The grab engagement cavity air pipe is connected with a double electric valve. The double electric valve is connected with the grab release cavity air pipe. The grab release cavity air pipe is connected with the lower end air inlet of the cylinder. The double electric valve is further connected with an upstream air pipe. The application can solve the problems that the function verification process of the original fuel assembly grab of the loading and unloading machine is not optimized and improved, and it is inconvenient to obtain the intuitive function verification effect. The application is used for verifying the engagement, release and self-locking performance of the fuel assembly grab of the loading and unloading machine during the non-overhaul period of the nuclear power plant.

Description

Technical Field

[0001] This invention belongs to the field of mechanical design technology, specifically relating to an integrated testing device for fuel assembly grippers on nuclear power plant loading and unloading machines. Background Technology

[0002] The integrated test device for fuel assembly grippers of nuclear power plant loading and unloading machines is a device used to verify the overall performance of fuel assembly grippers during non-major overhaul periods of nuclear power plants. It mainly verifies the engagement, release, and self-locking performance of fuel assembly grippers.

[0003] Currently, a simulated fuel assembly is transferred from the fuel transfer device on the fuel building side to the fuel transfer device on the reactor building side. After the tilting frame is vertical, the loading and unloading machine moves up to grab the simulated fuel assembly for fuel assembly gripper function verification. This process is quite cumbersome. The space is limited during verification. After the gripper is placed on the head of the simulated fuel assembly, it is not convenient to perform functional checks and verifications on components such as the gripper claws and sliding sleeves, which has significant limitations. Moreover, the environmental dose rate is high when the test is conducted in the component pool or the core pool, posing significant risks of foreign object falling, human error, radiation contamination, and additional radiation exposure.

[0004] Therefore, there is an urgent need to provide an integrated testing device for fuel assembly grippers of nuclear power plant loading and unloading machines that is easy to operate, not limited by time windows or spatial locations, has intuitive functional verification results, and has low risk. Summary of the Invention

[0005] The technical problem solved by this invention is that it provides an integrated testing device for fuel assembly grippers of nuclear power plant loading and unloading machines. This device can solve the problems that the original fuel assembly gripper functional verification process is not optimized and complete enough, and it is not convenient to obtain intuitive functional verification results. It is used to verify the engagement, release and self-locking performance of the fuel assembly grippers of nuclear power plants during non-major overhaul periods.

[0006] The technical solution adopted in this invention is as follows:

[0007] An integrated test device for a fuel assembly gripper in a nuclear power plant refueling machine includes a cylinder, a gripper connecting rod, a support frame, a gripper release chamber air pipe, a gripper engagement chamber air pipe, an upstream air pipe, and a dual-electric valve. The support frame is welded from several steel pipes and includes upper and lower parts. The upper part is used to fix the cylinder, and the lower part is used to grip the fuel assembly of the refueling machine. The bottom of the cylinder is connected to the gripper connecting rod through a first clamping nut. The upper air inlet of the cylinder is connected to the gripper engagement chamber air pipe, the gripper engagement chamber air pipe is connected to the dual-electric valve, the dual-electric valve is connected to the gripper release chamber air pipe, and the gripper release chamber air pipe is connected to the lower air inlet of the cylinder. The dual-electric valve is also connected to the upstream air pipe.

[0008] The cylinder is fixed to the top of the support frame by a lock nut.

[0009] A spring is provided at the top of the cylinder.

[0010] A second clamping nut is installed on the spring.

[0011] The gripper release chamber air pipe, gripper engagement chamber air pipe, upstream air pipe, and dual electric valve are connected by quick-connect air pipe couplings.

[0012] The upstream air pipe is connected to compressed air and controls the dual electric valves. The upstream air source enters the upper end of the cylinder through the air pipe of the gripper engagement chamber, causing the cylinder piston to move downward.

[0013] The dual solenoid valves control the upstream air source to enter the lower end of the cylinder through the release chamber air pipe, causing the cylinder piston to move upward.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0015] (1) The present invention provides an integrated test device for fuel assembly grippers of nuclear power plant loading and unloading machines, which can make it easier to verify the engagement, release and self-locking performance of fuel assembly grippers of loading and unloading machines, without time window or spatial location restrictions, and the functional verification effect is more intuitive and low risk. It not only reduces various operational risks for test personnel, but also fully guarantees the saving of critical paths during nuclear power plant overhaul and the smooth progress of core loading and unloading work due to the favorable condition of not being restricted by time window.

[0016] (2) The present invention provides an integrated test device for fuel assembly grippers of nuclear power plant loading and unloading machines, which saves process and is easy to operate; the performance of the grippers can be verified at any time in daily life, without being limited by the overhaul time window; it is not limited by spatial location, and the performance verification effect of the grippers is more intuitive; the risk of human error and operation is extremely low; it greatly reduces the radiation dose of test personnel; the early verification results ensure the smooth progress of the comprehensive inspection test of the loading and unloading machine, and at the same time shorten the critical path construction period of the overhaul.

[0017] (3) The integrated test device for fuel assembly grippers of nuclear power plant loading and unloading machines provided by the present invention has a simple process, is easier to operate, is not limited by spatial location, and has a more intuitive functional verification effect by simulating the verification method of the assembly. More importantly, it is not affected by the overhaul window. The verification outside the reactor building greatly reduces the risk of foreign objects and radiation during the test. At the same time, it ensures the rationality of the functional verification of the fuel assembly grippers in advance, and more effectively ensures the smooth progress of the overhaul loading and unloading work. Attached Figure Description

[0018] Figure 1 A front view of an integrated testing device for fuel assembly grippers in a nuclear power plant refueling machine, provided by the present invention;

[0019] Figure 2 Left view of an integrated testing device for fuel assembly grippers in a nuclear power plant refueling machine, provided by the present invention;

[0020] Figure 3 A top view of an integrated testing device for fuel assembly grippers in a nuclear power plant refueling machine, provided by the present invention;

[0021] Figure 4 A three-dimensional view of an integrated testing device for fuel assembly grippers in a nuclear power plant fuel loading and unloading machine, provided by the present invention;

[0022] In the diagram: 1-Cylinder, 2-Grip link, 3-Support frame, 4-Spring, 5-Locking nut, 6-First clamping nut, 7-Second clamping nut, 8-Grip release chamber air pipe, 9-Grip engagement chamber air pipe, 10-Upstream air pipe, 11-Dual solenoid valve. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

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

[0026] like Figure 1-4As shown, the present invention provides an integrated testing device for a fuel assembly gripper of a nuclear power plant refueling machine, comprising a cylinder 1, a gripper connecting rod 2, a support frame 3, a spring 4, a locking nut 5, a first clamping nut 6, a second clamping nut 7, a gripper release chamber air pipe 8, a gripper engagement chamber air pipe 9, an upstream air pipe 10, and a dual solenoid valve 11. The support frame 3 is welded from several steel pipes and includes upper and lower parts. The upper part is used to fix the cylinder 1, and the lower part is used to grip the fuel assembly of the refueling machine. The cylinder 1 is connected by a locking nut 5, a gripper connecting rod 2, a support frame 3, a spring 4, a locking nut 5, a first clamping nut 6, a second clamping nut 7, a gripper release chamber air pipe 8, a gripper engagement chamber air pipe 9, an upstream air pipe 10, and a dual solenoid valve 11. The support frame 3 is welded from several steel pipes and includes upper and lower parts. The upper part is used to fix the cylinder 1, and the lower part is used to grip the fuel assembly of the refueling machine. The tightening nut 5 is fixed to the top of the support frame 3. The bottom of the cylinder 1 is connected to the gripper connecting rod 2 through the first clamping nut 6. The top of the cylinder 1 is provided with a spring 4, and a second clamping nut 7 is installed on the spring 4. The upper air inlet of the cylinder 1 is connected to the gripper engagement chamber air pipe 9. The gripper engagement chamber air pipe 9 is connected to the double solenoid valve 11. The double solenoid valve 11 is connected to the gripper release chamber air pipe 8. The gripper release chamber air pipe 8 is connected to the lower air inlet of the cylinder 1. The double solenoid valve 11 is also connected to the upstream air pipe 10.

[0027] The gripper release chamber air pipe (8), gripper engagement chamber air pipe (9), upstream air pipe (10), and dual electric valve (11) are connected by quick-connect air pipes.

[0028] Connect the upper end of the fuel assembly gripper of the loading and unloading machine to the gripper connecting rod (2) of the device; adjust the height position of the fuel assembly gripper of the loading and unloading machine so that the self-locking stroke of the gripper is in the open state, and connect the upstream air pipe (10) to compressed air; operate the control switch of the double electric valve (11), and the upstream air source enters the upper end of the cylinder 1 through the air pipe (9) of the gripper engagement chamber, so that the cylinder piston moves downward to the position; the cylinder piston drives the connecting rod (2) to move downward, and at the same time the connecting rod (2) drives the internal control sleeve of the fuel assembly gripper of the loading and unloading machine to move downward, and the control sleeve drives the sliding sleeve to move downward. At the same time as the sliding sleeve moves downward, the lower end gripper of the fuel assembly gripper of the unloading machine is tightened, and the gripper is in the engagement state; operate the control switch of the double electric valve (11), and the upstream air source enters the lower end of the cylinder through the air pipe (8) of the release chamber, so that the cylinder piston moves upward to the position. The cylinder piston drives the connecting rod (2) to move upward, and at the same time the connecting rod (2) drives the internal control sleeve of the fuel assembly gripper of the loading and unloading machine to move upward. The control sleeve drives the sliding sleeve to move upward. At the same time the sliding sleeve moves upward, the lower end gripper of the fuel assembly gripper of the unloading machine loosens, and the gripper is in the released state. The up and down movement of the cylinder drives the connecting rod (2) to move up and down, and at the same time drives the fuel assembly gripper of the loading and unloading machine to move up and down. Thus, the engagement and release functions of the gripper can be verified at any time. Repeated operation can verify whether the engagement, release and self-locking performance of the fuel assembly gripper of the loading and unloading machine meets the requirements, and ensure the reliability of the gripper before reinstallation.

[0029] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0030] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A nuclear power plant refueling machine fuel assembly gripper integration test device, characterized by, The utility model relates to a fuel assembly loading and unloading machine, including cylinder (1), gripper connecting rod (2), support frame (3), gripper release cavity air pipe (8), gripper engagement cavity air pipe (9), upstream air pipe (10), double electric valve (11), the support frame (3) has several steel pipes and is welded, including upper and lower two parts, the upper part is used for fixed cylinder (1), the lower part is used for realizing the gripping of fuel assembly loading and unloading machine fuel assembly, the bottom of cylinder (1) is connected with gripper connecting rod (2) through first compression nut (6), the upper end air inlet of cylinder (1) is connected with gripper engagement cavity air pipe (9), gripper engagement cavity air pipe (9) is connected with double electric valve (11), double electric valve (11) is connected with gripper release cavity air pipe (8), gripper release cavity air pipe (8) is connected with the lower end air inlet of cylinder (1), double electric valve (11) is connected with upstream air pipe (10) still, Gripper release cavity air pipe (8), gripper engagement cavity air pipe (9), upstream air pipe (10), double electric valve (11) are connected through air pipe quick connector form between them, Upstream air pipe (10) connects compressed air, controls double electric valve (11), and upstream gas source enters the upper end of cylinder (1) through gripper engagement cavity air pipe (9), so that the cylinder piston moves downward, Control double electric valve (11), and upstream gas source enters the lower end of cylinder through release cavity air pipe (8), so that the cylinder piston moves upward.

2. The integrated test device for a fuel assembly gripper of a nuclear power plant's refueling machine according to claim 1, characterized by, The cylinder (1) is fixed on the top of the support frame (3) by the locking nut (5).

3. The integrated test device for a fuel assembly gripper of a nuclear power plant refueling machine according to claim 1, characterized by, The top of the cylinder (1) is provided with a spring (4).

4. The integrated test device for a fuel assembly gripper of a nuclear power plant's refueling machine according to claim 3, characterized by, The second compression nut (7) is installed on the spring (4).

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