A new fuel bundle clamping device for heavy water reactor

Abstract

The present invention belongs to the technical field of auxiliary facilities for heavy water reactor nuclear power plants, and specifically relates to a clamping device for new fuel rod bundles of heavy water reactors. The end plate clamping block and contact sensor are fixed to the side brackets of the clamping mechanism. The upper end of the side bracket of the clamping mechanism is connected to the top bracket of the clamping mechanism. The top bracket of the clamping mechanism is connected to the slider. The side of the top bracket of the clamping mechanism is connected to the cylinder extension rod. Under the restriction of the slider, the cylinder pushes the top bracket of the clamping mechanism to move along the slide rail to realize the opening and closing of the rod bundle clamping mechanism; the slide rail and cylinder are fixed to the clamping device bracket, and the rod bundle positioning block is connected to the clamping device bracket; one end of the anti-fall mechanism hydraulic rod is connected to the hydraulic rod mounting bracket, and the other end is connected to the anti-fall mechanism crank. The anti-fall mechanism crank is connected to the anti-fall mechanism gear, and the anti-fall mechanism bracket is foldable L-shaped. The present invention can realize the functions of rod bundle grasping, rod bundle positioning, and anti-falling, so as to meet the grasping and transportation requirements of new fuel rod bundles.

Description

Technical Field

[0001] The invention belongs to the technical field of auxiliary facilities of heavy water reactor nuclear power plants, and in particular relates to a new fuel rod bundle clamping device for a heavy water reactor. Background Art

[0002] The heavy water reactor (HWR) fuel bundle gripper is a critical component of the fuel handling system. It is designed to handle the handling of new fuel bundles during the HWR's ongoing fuel refueling process. The process for handling new fuel bundles within a HWR unit involves a robotic arm driving the bundle gripper to the bundle. After alignment, the gripper grasps the bundle and transfers it to the target location, completing the loading process.

[0003] After years of operation, heavy water reactor units experience an average radiation dose of approximately 0.6 mSv / h in the rod bundle loading area, due to its proximity to the core. This radiation dose continues to increase with longer operation. Currently, the total dose received during manual rod bundle transfer at the refueling site before loading the rod bundles into the reactor is approximately 0.3 mSv per person per year. Furthermore, manual rod bundle transfer typically involves the use of a small pneumatically balanced crane, which poses a risk of improperly positioned rods, shaking during transfer, or even falling, potentially damaging the bundles.

[0004] In view of the above situation, it is necessary to design a new fuel bundle clamping device for heavy water reactors, which can not only effectively reduce the radiation dose level of on-site operators, reduce labor intensity, and improve the efficiency of new fuel loading, but also ensure that the fuel bundles do not fall and cause damage during the loading process, thereby improving the safety and reliability of the new fuel loading process. Summary of the Invention

[0005] The purpose of the present invention is to provide a new fuel rod bundle clamping device for a heavy water reactor, which can realize the functions of rod bundle grasping, rod bundle positioning and anti-falling, so as to meet the grasping and transportation requirements of new fuel rod bundles and is suitable for the clamping and transportation of new fuel rod bundles for heavy water reactors.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] A new fuel rod bundle clamping device for a heavy water reactor includes a rod bundle clamping mechanism, which includes an end plate clamping block, a contact sensor, a cylinder extension rod, a cylinder, a clamping device bracket, a slider, a slide rail, a clamping mechanism side bracket and a clamping mechanism top bracket; the end plate clamping block and the contact sensor are fixed to the clamping mechanism side bracket, the upper end of the clamping mechanism side bracket is connected to the clamping mechanism top bracket, the clamping mechanism top bracket is connected to the slider, and the side of the clamping mechanism top bracket is connected to the cylinder extension rod. Under the restriction of the slider, the cylinder pushes the clamping mechanism top bracket to move along the slide rail to realize the opening and closing of the rod bundle clamping mechanism; the slide rail and the cylinder It is fixed on the clamping device bracket, and the rod bundle positioning block is connected to the clamping device bracket; one end of the anti-fall mechanism hydraulic rod is connected to the hydraulic rod mounting bracket, and the other end is connected to the anti-fall mechanism crank, and the anti-fall mechanism crank is connected to the anti-fall mechanism gear. The anti-fall mechanism bracket is a foldable L-shape, and its rotating section is fixed with the anti-fall mechanism gear. The anti-fall mechanism bracket is connected to the anti-fall mechanism fixed bracket, and the anti-fall clamping claw is fixed to the lower end of the anti-fall mechanism bracket. The lower part of the anti-fall mechanism fixed bracket is connected to the anti-fall mechanism gear, and the upper part of the anti-fall mechanism fixed bracket is connected to the clamping device bracket. The hydraulic rod mounting bracket is fixed to the clamping device bracket.

[0008] The lower end of the rod cluster positioning block is an arc surface with a curvature greater than the outer diameter of the rod cluster. When the anti-fall clamping claw extends toward the rod cluster, it first contacts the rod cluster to confirm the position of the rod cluster.

[0009] The rod bundle positioning block is connected to its fixing bracket, and the fixing bracket is connected to the clamping device bracket.

[0010] The end plate clamping block is fixed to the side bracket of the clamping mechanism by four bolts. The interior of the end plate clamping block is a circular groove, and the groove is chamfered.

[0011] One end of the hydraulic rod of the anti-fall mechanism is connected to the hydraulic rod mounting bracket through bolts and bearings, and the other end is connected to the crank of the anti-fall mechanism through bolts and bearings. When working, the hydraulic rod of the anti-fall mechanism extends to push the crank of the anti-fall mechanism to rotate.

[0012] The contact sensor is fixed to the side bracket of the clamping mechanism by bolts. The installation position of the contact sensor is measured to ensure that it is in contact with the accurately clamped rod bundle, thereby realizing the detection of the clamping state of the rod bundle.

[0013] The upper end of the side bracket of the clamping mechanism is connected to the top bracket of the clamping mechanism by bolts; the slide rail and the cylinder are fixed to the clamping claw device bracket by bolts; the anti-fall mechanism bracket is connected to the anti-fall mechanism fixed bracket by a bearing; the lower end of the anti-fall mechanism bracket is fixed with an anti-fall claw by bolts; the lower part of the anti-fall mechanism fixed bracket is connected to the anti-fall mechanism gear by a bearing; the upper part of the anti-fall mechanism fixed bracket is connected to the clamping claw device bracket by bolts and a long strip connector; the hydraulic rod mounting bracket is fixed to the clamping claw device bracket by bolts; a guard plate mounting hole is provided on the clamping claw device bracket, and an L-shaped guard plate is installed on the guard plate mounting hole by bolts.

[0014] When the anti-fall mechanism crank rotates, the anti-fall mechanism gear is driven to rotate at the same time. There are two anti-fall mechanism gears on each side that are engaged with each other, so that the two anti-fall mechanism gears rotate synchronously when the anti-fall mechanism crank rotates, thereby realizing the arc movement of the anti-fall mechanism bracket.

[0015] A quick-connect connector group is fixed above the clamping device bracket, which is used to connect the external air pipe and the air supply pipe of the cylinder. Above the clamping device bracket is a robotic arm connection flange, which is used to install the rod bundle clamping device on the robotic arm. The clamping device bracket and the robotic arm connection flange are integrally processed and formed.

[0016] After the anti-fall claw approaches the rod bundle from above, the rod bundle positioning block contacts the fuel rod bundle, and then the cylinder drives the rod bundle clamping mechanism to move from both ends to the middle, and then the anti-fall claw clamps the rod bundle through the end plate clamping block; then after the contact sensor confirms that the rod bundle is in the correct position, the cylinder drives the anti-fall mechanism gear to rotate, and the anti-fall mechanism gear drives the anti-fall claw to extend to the bottom of the rod bundle, surrounding the rod bundle 5 cm outside. When the rod bundle is clamped and transported to the target position, the cylinder first drives the anti-fall claw to retract, and then the rod bundle clamping mechanism releases the rod bundle to both sides.

[0017] The beneficial effects achieved by the present invention are:

[0018] The rod bundle clamping mechanism of the present invention adopts flexible clamping at both ends of the rod bundle, and is designed with a target rod bundle position detection function to prevent the rod bundle from colliding with the rod bundle clamping mechanism due to deviation of the rod bundle position during the rod bundle clamping process; after the rod bundle is clamped, it can be judged whether the rod bundle is clamped in place; the pneumatic or electric components used in the clamping mechanism have a safety self-locking function to ensure that the rod bundle will not be damaged or fall in the event of gas or power outages. It is designed with rod bundle anti-fall measures and has multiple redundant rod bundle protection functions to ensure that the rod bundle will 100% not fall under any circumstances. The present invention uses a rod bundle positioning block to confirm the position of the rod bundle; uses a cylinder and a slider rail to achieve clamping and releasing of the rod bundle; uses a contact sensor to achieve confirmation of the rod bundle clamping state; uses a crank and gear mechanism to achieve the movement of the rod bundle anti-fall mechanism; and uses an anti-fall mechanism to prevent the rod bundle from falling under unexpected conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a front view of a new fuel bundle clamping device for a heavy water reactor according to the present invention;

[0020] Figure 2 This is a bottom view of a new fuel bundle clamping device for a heavy water reactor according to the present invention;

[0021] Figure 3 This is a front view of a fuel bundle clamping mechanism of a new fuel bundle clamping device for a heavy water reactor according to the present invention;

[0022] Figure 4 This is a bottom view of a fuel bundle clamping mechanism of a new fuel bundle clamping device for a heavy water reactor according to the present invention;

[0023] Figure 5 The left and right views of the anti-fall mechanism of the clamping device for a new fuel bundle of a heavy water reactor according to the present invention;

[0024] In the figure: 1. End plate clamping block; 2. Contact sensor; 3. Anti-fall mechanism gear; 4. Anti-fall mechanism crank; 5. Anti-fall mechanism hydraulic rod; 6. Anti-fall mechanism bracket; 7. Cylinder extension rod; 8. Quick connector assembly; 9. Robot arm connection flange; 10. Guard plate mounting hole; 11. Cylinder; 12. Rod bundle positioning block; 13. Gripper device bracket; 14. Slider; 15. Slide rail; 16. Clamping mechanism side bracket; 17. Clamping mechanism top bracket; 18. Hydraulic rod mounting bracket; 19. Anti-fall mechanism fixing bracket; 20. Anti-fall clamp. DETAILED DESCRIPTION

[0025] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] like Figure 1-5 As shown, a new fuel rod bundle clamping device for a heavy water reactor includes: a rod bundle positioning mechanism, a rod bundle clamping mechanism and an anti-falling mechanism.

[0027] The rod cluster positioning mechanism consists of a rod cluster positioning block 12 and its fixing bracket. The lower end of the rod cluster positioning block 12 is an arc surface with a curvature slightly larger than the outer diameter of the rod cluster. When the anti-fall clamping claw extends toward the rod cluster, it first contacts the rod cluster to confirm the position of the rod cluster and avoid collision with the rod cluster clamping mechanism due to deviation of the rod cluster position. The rod cluster positioning block 12 is connected to its fixing bracket by bolts, and the fixing bracket is further connected to the clamping claw device bracket 13 by bolts.

[0028] The rod bundle clamping mechanism is responsible for clamping and fixing the rod bundle, and is composed of an end plate clamping block 1, a contact sensor 2, a cylinder extension rod 7, a cylinder 11, a clamping claw device bracket 13, a slider 14, a slide rail 15, a clamping mechanism side bracket 16, and a clamping mechanism top bracket 17; the end plate clamping block 1 is fixed to the clamping mechanism side bracket 16 by four bolts, and the inner diameter of the circular groove inside the end plate clamping block 1 is the same as the outer diameter of the end plate, and is chamfered to facilitate clamping of both ends of the rod bundle without clearance, and the contact sensor 2 is fixed to the clamping mechanism side bracket 16 by bolts, and the installation position is measured to ensure that it is in contact with the accurately clamped rod bundle, thereby realizing the detection of the rod bundle clamping state; the clamping mechanism side bracket 16 The upper end is connected to the top bracket 17 of the clamping mechanism by bolts, the top bracket 17 of the clamping mechanism is connected to the slider 14, and the side of the top bracket 17 of the clamping mechanism is connected to the cylinder extension rod 7. Under the restriction of the slider 14, the cylinder 11 pushes the top bracket 17 of the clamping mechanism to move along the slide rail 15, thereby realizing the opening and closing of the rod bundle clamping mechanism; the slide rail 15 and the cylinder 11 are fixed to the clamping device bracket 13 by bolts, and a quick-connect connector group 8 is fixed above the clamping device bracket 13, which is used to connect the external air pipe and the air supply pipe of the cylinder 11. Above the clamping device bracket 13 is a robot arm connecting flange 9, which is used to install the rod bundle clamping device on the robot arm. The clamping device bracket 13 and the robot arm connecting flange 9 are integrally processed and formed.

[0029] The anti-fall mechanism is responsible for protecting the rod bundle at the periphery of the rod bundle. It is the main mechanism for achieving safety redundancy, ensuring that the rod bundle does not fall under unexpected conditions. It consists of an anti-fall mechanism gear 3, an anti-fall mechanism crank 4, an anti-fall mechanism hydraulic rod 5, an anti-fall mechanism bracket 6, a hydraulic rod mounting bracket 18, an anti-fall mechanism fixed bracket 19, and an anti-fall clamp 20; one end of the anti-fall mechanism hydraulic rod 5 is connected to the hydraulic rod mounting bracket 18 by bolts and bearings, and the other end is connected to the anti-fall mechanism crank 4 by bolts and bearings. When working, the anti-fall mechanism hydraulic rod 5 extends to push the anti-fall mechanism crank 4 to rotate, and the anti-fall mechanism crank 4 is connected to the anti-fall mechanism gear 3 by bolts. When the anti-fall mechanism crank 4 rotates, it drives the anti-fall mechanism gear 3 to rotate at the same time. The two anti-fall mechanism gears 3 on each side are meshed with each other, so that the two anti-fall mechanism gears 3 rotate synchronously when the anti-fall mechanism crank 4 rotates, thereby realizing the arc movement of the anti-fall mechanism bracket 6; the anti-fall mechanism bracket 6 is a foldable L-shape, and the rotating section is fixed with the anti-fall mechanism gear 3, and is connected to the anti-fall mechanism fixed bracket 19 through a bearing. The lower end is fixed with an anti-fall clamping claw 20 by bolts. The lower part of the anti-fall mechanism fixed bracket 19 is connected to the anti-fall mechanism gear 3 through a bearing, so that the anti-fall mechanism gear 3 rotates in a fixed position. The upper part is connected to the clamping claw device bracket 13 through bolts and a long strip connector. The hydraulic rod mounting bracket 18 is fixed to the clamping claw device bracket 13 by bolts, and together realizes the fixation of the entire anti-fall mechanism. A guard plate mounting hole 10 is provided on the clamping claw device bracket 13, and an L-shaped guard plate is installed on the guard plate mounting hole 10 by bolts as the outer layer protection of the mechanism.

[0030] After the anti-fall clamp 20 approaches the fuel rod bundle from above, the cluster positioning block 12 contacts the fuel rod bundle. Cylinder 11 then drives the bundle clamping mechanism from both ends toward the center, and the anti-fall clamp 20 clamps the bundle through the end plate clamping block 1. After the contact sensor 2 confirms the correct bundle position, cylinder 11 drives the anti-fall mechanism gear 3 to rotate, driving the anti-fall clamp 20 to extend below the bundle, encircling it approximately 5 cm from the outside. When the bundle is clamped and transported to the target location, cylinder 11 first drives the anti-fall clamp 20 to retract, and then the bundle clamping mechanism releases the bundle to both sides.

Claims

1. A new fuel bundle clamping device for a heavy water reactor, characterized by: The rod bundle clamping mechanism includes an end plate clamping block, a contact sensor, a cylinder extension rod, a cylinder, a clamping claw device bracket, a slider, a slide rail, a clamping mechanism side bracket and a clamping mechanism top bracket; the end plate clamping block and the contact sensor are fixed on the clamping mechanism side bracket, the upper end of the clamping mechanism side bracket is connected to the clamping mechanism top bracket, the clamping mechanism top bracket is connected to the slider, the side of the clamping mechanism top bracket is connected to the cylinder extension rod, and under the restriction of the slider, the cylinder pushes the clamping mechanism top bracket to move along the slide rail direction to realize the opening and closing of the rod bundle clamping mechanism; the slide rail and the cylinder are fixed on the clamping claw device On the bracket, the rod bundle positioning block is connected to the clamping device bracket; one end of the anti-fall mechanism hydraulic rod is connected to the hydraulic rod mounting bracket, and the other end is connected to the anti-fall mechanism crank, the anti-fall mechanism crank is connected to the anti-fall mechanism gear, the anti-fall mechanism bracket is a foldable L-shape, and its rotating section is fixed with the anti-fall mechanism gear, the anti-fall mechanism bracket is connected to the anti-fall mechanism fixed bracket, the lower end of the anti-fall mechanism bracket is fixed with an anti-fall clamping claw, the lower part of the anti-fall mechanism fixed bracket is connected to the anti-fall mechanism gear, the upper part of the anti-fall mechanism fixed bracket is connected to the clamping device bracket, and the hydraulic rod mounting bracket is fixed to the clamping device bracket.

2. The heavy water reactor new fuel bundle clamping device according to claim 1, characterized in that: The lower end of the rod cluster positioning block is an arc surface with a curvature greater than the outer diameter of the rod cluster. When the anti-fall clamping claw extends toward the rod cluster, it first contacts the rod cluster to confirm the position of the rod cluster.

3. The heavy water reactor new fuel bundle clamping device according to claim 1, characterized in that: The rod bundle positioning block is connected to its fixing bracket, and the fixing bracket is connected to the clamping device bracket.

4. The heavy water reactor new fuel bundle clamping device according to claim 1, characterized in that: The end plate clamping block is fixed to the side bracket of the clamping mechanism by four bolts. The interior of the end plate clamping block is a circular groove, and the groove is chamfered.

5. The heavy water reactor new fuel bundle clamping device according to claim 1, characterized in that: One end of the hydraulic rod of the anti-fall mechanism is connected to the hydraulic rod mounting bracket through bolts and bearings, and the other end is connected to the crank of the anti-fall mechanism through bolts and bearings. When working, the hydraulic rod of the anti-fall mechanism extends to push the crank of the anti-fall mechanism to rotate.

6. The heavy water reactor new fuel bundle clamping device according to claim 1, characterized in that: The contact sensor is fixed to the side bracket of the clamping mechanism by bolts. The installation position of the contact sensor is measured to ensure that it is in contact with the accurately clamped rod bundle, thereby realizing the detection of the clamping state of the rod bundle.

7. The heavy water reactor new fuel bundle clamping device according to claim 1, characterized in that: The upper end of the side bracket of the clamping mechanism is connected to the top bracket of the clamping mechanism by bolts; the slide rail and the cylinder are fixed to the clamping claw device bracket by bolts; the anti-fall mechanism bracket is connected to the anti-fall mechanism fixed bracket by a bearing; the lower end of the anti-fall mechanism bracket is fixed with an anti-fall claw by bolts; the lower part of the anti-fall mechanism fixed bracket is connected to the anti-fall mechanism gear by a bearing; the upper part of the anti-fall mechanism fixed bracket is connected to the clamping claw device bracket by bolts and a long strip connector; the hydraulic rod mounting bracket is fixed to the clamping claw device bracket by bolts; a guard plate mounting hole is provided on the clamping claw device bracket, and an L-shaped guard plate is installed on the guard plate mounting hole by bolts.

8. The heavy water reactor new fuel bundle clamping device according to claim 1, characterized in that: When the anti-fall mechanism crank rotates, the anti-fall mechanism gear is driven to rotate at the same time. There are two anti-fall mechanism gears on each side that are engaged with each other, so that the two anti-fall mechanism gears rotate synchronously when the anti-fall mechanism crank rotates, thereby realizing the arc movement of the anti-fall mechanism bracket.

9. The heavy water reactor new fuel bundle clamping device according to claim 1, characterized in that: A quick-connect connector group is fixed above the clamping device bracket, which is used to connect the external air pipe and the air supply pipe of the cylinder. Above the clamping device bracket is a robotic arm connection flange, which is used to install the rod bundle clamping device on the robotic arm. The clamping device bracket and the robotic arm connection flange are integrally processed and formed.

10. The heavy water reactor new fuel bundle clamping device according to claim 1, characterized in that: After the anti-fall claw approaches the rod bundle from above, the rod bundle positioning block contacts the fuel rod bundle, and then the cylinder drives the rod bundle clamping mechanism to move from both ends to the middle, and then the anti-fall claw clamps the rod bundle through the end plate clamping block; then after the contact sensor confirms that the rod bundle is in the correct position, the cylinder drives the anti-fall mechanism gear to rotate, and the anti-fall mechanism gear drives the anti-fall claw to extend to the bottom of the rod bundle, surrounding the rod bundle 5 cm outside. When the rod bundle is clamped and transported to the target position, the cylinder first drives the anti-fall claw to retract, and then the rod bundle clamping mechanism releases the rod bundle to both sides.

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