A new fuel bundle interlock detection device for heavy water reactors

Abstract

The present invention belongs to the technical field of auxiliary facilities of heavy water reactor nuclear power plants, and specifically relates to an interlock detection device for new fuel rod bundles of heavy water reactors. It includes a lifting mechanism, a transverse movement mechanism and an interlock detection mechanism. The lifting mechanism realizes the lifting and lowering movement of the interlock detection mechanism, and the transverse movement mechanism realizes the transverse movement of the interlock detection mechanism. The lifting mechanism is composed of a lifting servo electric cylinder, a lifting upper connecting plate, a lifting linear shaft, a coupling and an interlock detection mechanism mounting plate. The upper and lower ends of the four lifting linear shafts are respectively connected to the lifting upper connecting plate and the interlock detection mechanism mounting plate by screws, and the lifting servo electric cylinder is connected to the interlock detection mechanism mounting plate by a coupling. The present invention is suitable for realizing automatic high-precision detection of the outer diameter of new fuel rod bundles of heavy water reactors, and has functions such as adjustable clamping force, self-alignment, and force measurement protection to meet the interlock detection 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 device for detecting interlocking of new fuel bundles of heavy water reactors. Background Art

[0002] The interlock detection device for new fuel bundles in heavy water reactors (HWRs) is an auxiliary facility in the fuel handling system. It is designed to automatically detect the interlocks of new fuel bundles before they are loaded into the HWR during continuous refueling. The interlock detection process for new fuel bundles in a HWR unit is as follows: the interlock detection mechanism moves above the new fuel bundle, descends, and grips the bundle. Interlock detection is performed by checking the outer diameter of the new fuel bundle for any deviations from tolerance, thereby determining whether the bundle is interlocked.

[0003] After years of operation, the average gamma dose in the rod bundle loading area of a heavy water reactor, due to its proximity to the core, is approximately 0.06 mSv / h. This radiation dose continues to increase with extended operation. Currently, the total dose received during manual interlock checks at the refueling site before the rod bundles are loaded into the reactor is approximately 0.3 mSv per person-year. Furthermore, manual interlock checks cannot accurately control the closing force of the caliper, which can easily lead to misalignment and measurement errors.

[0004] In view of the above situation, it is necessary to design a new fuel bundle interlock detection device for heavy water reactors and integrate it into the newly developed new fuel bundle automatic loading equipment. This can not only greatly 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 break 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 device for detecting the interlocking of new fuel rod bundles of a heavy water reactor, which is suitable for realizing automatic high-precision detection of the outer diameter of new fuel rod bundles of a heavy water reactor and has functions such as adjustable clamping force, self-alignment, and force measurement protection to meet the interlocking detection requirements of new fuel rod bundles.

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

[0007] A heavy water reactor new fuel bundle interlock detection device comprises a lifting mechanism, a transverse movement mechanism and an interlock detection mechanism. The lifting mechanism realizes the lifting movement of the interlock detection mechanism, and the transverse movement mechanism realizes the transverse movement of the interlock detection mechanism.

[0008] The lifting mechanism consists of a lifting servo electric cylinder, a lifting upper connecting plate, a lifting linear shaft, a coupling and an interlocking detection mechanism mounting plate. The upper and lower ends of the four lifting linear shafts are connected to the lifting upper connecting plate and the interlocking detection mechanism mounting plate respectively through screws. The lifting servo electric cylinder is connected to the interlocking detection mechanism mounting plate through a coupling.

[0009] When the lifting servo electric cylinder is fixed, the piston of the lifting servo electric cylinder is extended and retracted, thereby realizing the up and down movement of the overall structure composed of the interlocking detection mechanism mounting plate, the lifting upper connecting plate and the lifting linear shaft, thereby realizing the lifting movement of the interlocking detection mechanism.

[0010] The transverse mechanism consists of a transverse linear guide, a transverse connecting plate, a bearing seat, a transverse cylinder and a transverse cylinder buffer. The two transverse cylinder buffers are fixed to the two ends of the transverse cylinder by screws; the two sides of the transverse connecting plate are connected to the transverse cylinder and the slider of the transverse linear guide by screws; the four bearing seats are fixed to the transverse connecting plate by shaft holes and screws.

[0011] The piston of the transverse cylinder moves to drive the transverse connecting plate to move transversely, thereby realizing the transverse movement of the interlock detection mechanism.

[0012] The four lifting linear axes of the lifting mechanism pass through the four bearing seats of the transverse movement mechanism and are matched with the shaft holes to achieve plane positioning; the lifting servo electric cylinder and the transverse movement connecting plate are connected by screws to fix the lifting servo electric cylinder; the interlocking detection mechanism and the interlocking detection mechanism mounting plate of the lifting mechanism are connected by screws.

[0013] The structure of the interlocking detection mechanism is as follows: the two sliders of the toothed belt servo electric cylinder are respectively connected to the left servo slider connecting plate and the right servo slider connecting plate by screws, the left servo slider connecting plate and the right servo slider connecting plate are respectively connected to the left opening and closing linear guide and the right opening and closing linear guide by screws, the left opening and closing linear guide and the right opening and closing linear guide are respectively connected to the left opening and closing guide slider connecting plate and the right opening and closing guide slider connecting plate by screws, the displacement sensor trigger component is connected to the right opening and closing guide slider connecting plate by screws, the displacement sensor is connected and fixed to the displacement sensor mounting plate, the displacement sensor mounting plate is connected to the left opening and closing guide slider connecting plate by screws, the left force sensor mounting plate A and the right force sensor mounting plate A are respectively connected to the right opening and closing guide slider connecting plate and the left opening and closing guide slider connecting plate by screws; the right compression spring cooperates with the axis hole of the right spring core shaft, the left compression spring cooperates with the axis hole of the left spring core shaft and is connected to the right force sensor The left force sensor and the left force sensor are coaxially screwed and fixed, the right force sensor guide shaft and the left force sensor guide shaft are respectively fixed to the right opening and closing guide slider connecting plate and the left opening and closing guide slider connecting plate by screws, the left force sensor mounting plate B and the right force sensor mounting plate B are respectively connected to the right opening and closing guide slider connecting plate and the left opening and closing guide slider connecting plate by screws, the left force sensor mounting plate B and the right force sensor mounting plate B are respectively connected to the left micro-motion linear guide and the right micro-motion linear guide by screws, the right lower connecting plate A, the right lower connecting plate B, the right upper connecting plate A, the lower left connecting plate A, the upper left connecting plate A, and the upper left connecting plate B are respectively installed on the upper and lower sides, the left micro-motion linear guide and the right micro-motion linear guide are respectively installed with the upper right compression spring, the upper right spring core shaft, the lower right compression spring, the lower right spring core shaft, the lower left compression spring, the lower left spring core shaft, the upper left compression spring and the upper left spring core shaft by screws.

[0014] The displacement sensor is fixed to the displacement sensor mounting plate by screws through the displacement sensor buckle.

[0015] The opening and closing movement of the two sliders of the belt servo electric cylinder realizes the opening and closing movement of the left opening and closing guide rail slider connecting plate and the right opening and closing guide rail slider connecting plate, and drives the opening and closing operation of the right C-type gauge and the left C-type gauge. During the clamping process of the belt servo electric cylinder, the right C-type gauge, the left C-type gauge and the clamping rod bundle are concentric to realize up and down fine-tuning and floating; at the same time, during the clamping process, the right force sensor, the left force sensor and the spring component realize whether the clamping force is overloaded and the opening and closing fine-motion adjustment. After the left C-type gauge and the right C-type gauge are closed, the displacement sensor trigger component contacts the displacement sensor, thereby realizing the detection of the size of the closed gap of the caliper and judging whether there is any abnormality in the outer diameter of the clamping rod bundle.

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

[0017] Realize automated operation: Use servo electric cylinder and PLC control to realize fully automated measurement technology, realize the technical effect of automated detection and replacing manual labor.

[0018] Provide higher precision measurement: Using contact displacement sensor technology, the measurement accuracy is ≤±0.01mm, meeting the measurement requirements of precision rod bundles.

[0019] The clamping force is adjustable: the clamping force range is (4±0.05) kg, and it has a clamping capacity of at least 10 kg, which is suitable for measuring rod bundles with different clamping force requirements.

[0020] Added self-aligning function: using floating spring and floating frame guide rail slider to realize automatic alignment of C-type caliper, eliminate errors and ensure measurement accuracy.

[0021] Real-time detection of position and clamping force: During the interlocking inspection of new fuel bundles, a protection mechanism using dual detection and judgment of position and clamping force is adopted to prevent product damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is an isometric view of a heavy water reactor nuclear fuel bundle interlock detection device;

[0023] Figure 2 This is an axonometric view of the lifting mechanism of a heavy water reactor nuclear fuel bundle interlock detection device;

[0024] Figure 3 This is an axonometric diagram of the transverse movement mechanism of a heavy water reactor nuclear fuel bundle interlock detection device;

[0025] Figure 4 This is an isometric view of the interlock detection mechanism of a heavy water reactor nuclear fuel bundle interlock detection device;

[0026] Figure: 1. Lifting mechanism; 2. Transverse movement mechanism; 3. Interlock detection mechanism; 101. Lifting servo cylinder; 102. Lifting upper connecting plate; 103. Lifting linear axis; 104. Coupling; 105. Interlock detection mechanism mounting plate; 201. Transverse linear guide rail; 202. Transverse connecting plate; 203. Bearing seat; 204. Transverse cylinder; 205. Transverse cylinder buffer; 301. Toothed belt servo cylinder; 302. Right servo slider connecting plate Connecting plate; 303, right opening and closing linear guide; 304, displacement sensor trigger component; 305, right opening and closing guide slider connecting plate; 306, right force sensor mounting plate A; 307, right compression spring; 308, right spring core shaft; 309, right force sensor; 310, right force sensor guide shaft; 311, right force sensor mounting plate B; 312, right micro-motion linear guide; 313, right lower connecting plate A; 314, right lower connecting plate B; 315 316, lower right compression spring; 317, upper right connecting plate A; 318, upper right compression spring; 319, upper right spring core shaft; 320, right C-type gauge; 321, left servo slider connecting plate; 322, left opening and closing linear guide; 323, displacement sensor; 324, displacement sensor mounting plate; 325, displacement sensor buckle; 326, left opening and closing guide slider connecting plate; 327, left force sensor mounting plate A; 328 , left force sensor; 329, left spring core shaft; 330, left compression spring; 331, left force sensor guide shaft; 332, left force sensor mounting plate B; 333, lower left connecting plate A; 334, lower left compression spring; 335, lower left spring core shaft; 336, left micro-motion linear guide; 337, upper left connecting plate A; 338, upper left compression spring; 339, upper left spring core shaft; 340, upper left connecting plate B; 341, left C-type gauge. DETAILED DESCRIPTION

[0027] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] like Figure 1-4 As shown, the heavy water reactor nuclear fuel bundle interlock detection device consists of three parts: a lifting mechanism 1, a transverse mechanism 2, and an interlock detection mechanism 3. The four lifting linear shafts 103 of the lifting mechanism 1 pass through the four bearing blocks 203 of the transverse mechanism 2, and the shaft holes cooperate to achieve planar positioning. The lifting servo cylinder 101 is screwed to the transverse connecting plate 202 to secure the lifting servo cylinder 101. The interlock detection mechanism 3 is also screwed to the interlock detection mechanism mounting plate 105 of the lifting mechanism 1. During operation, the lifting servo cylinder 101 of the lifting mechanism 1 moves up and down, which in turn drives the interlock detection mechanism 3 up and down. The transverse cylinder 204 of the transverse mechanism 2 moves, driving the interlock detection mechanism 3 to move laterally.

[0029] The lifting mechanism 1 consists of a lifting servo cylinder 101, an upper lifting connection plate 102, lifting linear shafts 103, a coupling 104, and an interlock detection mechanism mounting plate 105. The upper and lower ends of the four lifting linear shafts 103 are connected to the upper lifting connection plate 102 and the interlock detection mechanism mounting plate 105 via screws, respectively. The lifting servo cylinder 101 and the interlock detection mechanism mounting plate 105 are connected via a coupling 104. When the lifting servo cylinder 101 is fixed, its piston expands and contracts, causing the entire structure consisting of the interlock detection mechanism mounting plate 105, the upper lifting connection plate 102, and the lifting linear shafts 103 to move up and down, thereby achieving the lifting and lowering movement of the interlock detection mechanism 3.

[0030] The transverse mechanism 2 consists of a transverse linear guide 201, a transverse connecting plate 202, a bearing block 203, a transverse cylinder 204, and a transverse cylinder buffer 205. Two transverse cylinder buffers 205 are screwed to the ends of the transverse cylinder 204; the two sides of the transverse connecting plate 202 are screwed to the transverse cylinder 204 and the sliders of the transverse linear guide 201; and the four bearing blocks 203 are fixed to the transverse connecting plate 202 via axial holes and screw connections. The primary function of the transverse mechanism 2 is to drive the transverse connecting plate 202 to move laterally, thereby achieving lateral movement of the interlock detection mechanism 3, through the piston movement of the transverse cylinder 204.

[0031] The interlock detection mechanism 3 consists of a toothed belt servo electric cylinder 301, a right servo slider connecting plate 302, a right opening and closing linear guide 303, a displacement sensor trigger component 304, a right opening and closing guide slider connecting plate 305, a right force sensor mounting plate A306, a right compression spring 307, a right spring core shaft 308, a right force sensor 309, a right force sensor guide shaft 310, a right force sensor mounting plate B311, a right micro-motion linear guide 312, a right lower connecting plate A313, a right lower connecting plate B314, a right lower compression spring 315, a right lower spring core shaft 316, a right upper connecting plate A317, a right upper compression spring 318, a right upper spring core shaft 319, a right C-type gauge 320, a left The servo slider connecting plate 321, the left opening and closing linear guide 322, the displacement sensor 323, the displacement sensor mounting plate 324, the displacement sensor buckle 325, the left opening and closing guide slider connecting plate 326, the left force sensor mounting plate A327, the left force sensor 328, the left spring core shaft 329, the left compression spring 330, the left force sensor guide shaft 331, the left force sensor mounting plate B332, the lower left connecting plate A333, the lower left compression spring 334, the lower left spring core shaft 335, the left micro-motion linear guide 336, the upper left connecting plate A337, the upper left compression spring 338, the upper left spring core shaft 339, the upper left connecting plate B340 and the left C-type gauge 341.

[0032] The two sliders of the toothed belt servo electric cylinder 301 are screwed to the left servo slider connecting plate 321 and the right servo slider connecting plate 302, respectively. The left servo slider connecting plate 321 and the right servo slider connecting plate 302 are screwed to the left opening and closing linear guide 322 and the right opening and closing linear guide 303, respectively. The left opening and closing linear guide 322 and the right opening and closing linear guide 303 are screwed to the left opening and closing guide slider connecting plate 326 and the right opening and closing guide slider connecting plate 305, respectively. The displacement sensor trigger component 304 is screwed to the right opening and closing guide slider connecting plate 305. The displacement sensor 323 is screwed to the displacement sensor mounting plate 324 via the displacement sensor clip 325. The displacement sensor mounting plate 324 is screwed to the left opening and closing guide slider connecting plate 326. The left force sensor mounting plate A327 and the right force sensor mounting plate A306 are connected to the right opening and closing guide rail slider connecting plate 305 and the left opening and closing guide rail slider connecting plate 326 respectively through screws.

[0033] The right compression spring 307 mates with the axial hole of the right spring core shaft 308, while the left compression spring 330 mates with the axial hole of the left spring core shaft 329. These are coaxially screwed together with the right force sensor 309 and the left force sensor 328, enabling clamping force detection and providing elastic buffering in the event of overload. The right and left force sensor guide shafts 310 and 331 are screwed to the right and left guide rail slider connection plates 305 and 326, respectively, to provide guidance and positioning for the left and right calipers when clamping the rod bundle. The left and right force sensor mounting plates B332 and B311 are screwed to the right and left guide rail slider connection plates 305 and 326, respectively. The left force sensor mounting plate B332 and the right force sensor mounting plate B311 are respectively connected to the left fine-motion linear guide 336 and the right fine-motion linear guide 312 by screws, and the right lower connecting plate A313, the right lower connecting plate B314, the right upper connecting plate A317, the left lower connecting plate A333, the left upper connecting plate A337, and the left upper connecting plate B340 are respectively installed on the left and right upper and lower sides and connected by screws, and the right upper compression spring 318, the right upper spring core shaft 319, the right lower compression spring 315, the right lower spring core shaft 316, the left lower compression spring 334, the left lower spring core shaft 335, the left upper compression spring 338, and the left upper spring core shaft 339 are respectively installed on the left and right fine-motion linear guide 336 and the right fine-motion linear guide 312 by screws, thereby realizing the up and down floating fine-tuning function during the clamping process of the right C-type gauge 320 and the left C-type gauge 341.

[0034] The opening and closing motion of the two sliders of the belt servo electric cylinder 301 enables the opening and closing of the left and right guide rail slider connecting plates 326 and 305, driving the opening and closing of the right and left C-shaped gauges 320 and 341. During the clamping process, the belt servo electric cylinder 301 monitors the concentricity of the right and left C-shaped gauges 320 and 341 with the clamping rod bundle, enabling fine-tuning and floating. Simultaneously, right and left force sensors 309 and 328, along with spring components, are installed on both sides during the clamping process to ensure overload control and fine-tune the opening and closing motions. After the left and right C-shaped gauges 341 and 320 are closed, the displacement sensor trigger component 304 contacts the displacement sensor 323, detecting the size of the caliper gap and determining any abnormalities in the outer diameter of the clamping rod bundle.

Claims

1. A new fuel bundle interlock detection device for a heavy water reactor, characterized by: It includes a lifting mechanism, a transverse movement mechanism and an interlocking detection mechanism. The lifting mechanism realizes the lifting movement of the interlocking detection mechanism, and the transverse movement mechanism realizes the transverse movement of the interlocking detection mechanism; the structure of the interlocking detection mechanism is: the two sliders of the toothed belt servo electric cylinder are respectively connected to the left servo slider connecting plate and the right servo slider connecting plate by screws, the left servo slider connecting plate and the right servo slider connecting plate are respectively connected to the left opening and closing linear guide and the right opening and closing linear guide by screws, the left opening and closing linear guide and the right opening and closing linear guide are respectively connected to the left opening and closing guide slider connecting plate and the right opening and closing guide slider connecting plate by screws, the displacement sensor trigger component is connected to the right opening and closing guide slider connecting plate by screws, the displacement sensor is connected and fixed to the displacement sensor mounting plate, the displacement sensor mounting plate is connected to the left opening and closing guide slider connecting plate by screws, the left force sensor mounting plate A and the right force sensor mounting plate A are respectively connected to the right opening and closing guide slider connecting plate and the left opening and closing guide slider connecting plate by screws; the right compression spring cooperates with the right spring core shaft axis hole, the left compression spring is connected to the left spring The axial hole of the core shaft is matched with the right force sensor and the left force sensor coaxially screwed for installation and fixation. The right force sensor guide shaft and the left force sensor guide shaft are respectively fixed with the right opening and closing guide rail slider connecting plate and the left opening and closing guide rail slider connecting plate by screws. The left force sensor mounting plate B and the right force sensor mounting plate B are respectively connected with the right opening and closing guide rail slider connecting plate and the left opening and closing guide rail slider connecting plate by screws. The left force sensor mounting plate B and the right force sensor mounting plate B are respectively connected with the left micro-motion linear guide and the right micro-motion linear guide by screws. The linear guide rails are connected, and the lower right connecting plate A, lower right connecting plate B, upper right connecting plate A, lower left connecting plate A, upper left connecting plate A, and upper left connecting plate B are installed on the upper and lower sides respectively. The upper right compression spring, upper right spring core shaft, lower right compression spring, lower right spring core shaft, lower left compression spring, lower left spring core shaft, upper left compression spring, and upper left spring core shaft are installed on the upper and lower sides of the left micro-motion linear guide and the right micro-motion linear guide respectively by screws; thereby realizing the up and down floating fine-tuning function during the clamping process of the right C-type gauge and the left C-type gauge.

2. The heavy water reactor new fuel bundle interlock detection device according to claim 1, characterized in that: The lifting mechanism consists of a lifting servo electric cylinder, a lifting upper connecting plate, a lifting linear shaft, a coupling and an interlocking detection mechanism mounting plate. The upper and lower ends of the four lifting linear shafts are connected to the lifting upper connecting plate and the interlocking detection mechanism mounting plate respectively through screws. The lifting servo electric cylinder is connected to the interlocking detection mechanism mounting plate through a coupling.

3. The heavy water reactor new fuel bundle interlock detection device according to claim 2, characterized in that: When the lifting servo electric cylinder is fixed, the piston of the lifting servo electric cylinder is extended and retracted, thereby realizing the up and down movement of the overall structure composed of the interlocking detection mechanism mounting plate, the lifting upper connecting plate and the lifting linear shaft, thereby realizing the lifting movement of the interlocking detection mechanism.

4. The heavy water reactor new fuel bundle interlock detection device according to claim 2, characterized in that: The transverse mechanism consists of a transverse linear guide, a transverse connecting plate, a bearing seat, a transverse cylinder and a transverse cylinder buffer. The two transverse cylinder buffers are fixed to the two ends of the transverse cylinder by screws; the two sides of the transverse connecting plate are connected to the transverse cylinder and the slider of the transverse linear guide by screws; the four bearing seats are fixed to the transverse connecting plate by shaft holes and screws.

5. The heavy water reactor new fuel bundle interlock detection device according to claim 4, characterized in that: The piston of the transverse cylinder moves to drive the transverse connecting plate to move transversely, thereby realizing the transverse movement of the interlock detection mechanism.

6. The heavy water reactor new fuel bundle interlock detection device according to claim 4, characterized in that: The four lifting linear axes of the lifting mechanism pass through the four bearing seats of the transverse movement mechanism and are matched with the shaft holes to achieve plane positioning; the lifting servo electric cylinder and the transverse movement connecting plate are connected by screws to fix the lifting servo electric cylinder; the interlocking detection mechanism and the interlocking detection mechanism mounting plate of the lifting mechanism are connected by screws.

7. The heavy water reactor new fuel bundle interlock detection device according to claim 1, characterized in that: The displacement sensor is fixed to the displacement sensor mounting plate by screws through the displacement sensor buckle.

8. The heavy water reactor new fuel bundle interlock detection device according to claim 1, characterized in that: The opening and closing movement of the two sliders of the belt servo electric cylinder realizes the opening and closing movement of the left opening and closing guide rail slider connecting plate and the right opening and closing guide rail slider connecting plate, and drives the opening and closing operation of the right C-type gauge and the left C-type gauge. During the clamping process of the belt servo electric cylinder, the right C-type gauge, the left C-type gauge and the clamping rod bundle are concentric to realize up and down fine-tuning and floating; at the same time, during the clamping process, the right force sensor, the left force sensor and the spring component realize whether the clamping force is overloaded and the opening and closing fine-motion adjustment. After the left C-type gauge and the right C-type gauge are closed, the displacement sensor trigger component contacts the displacement sensor, thereby realizing the detection of the size of the closed gap of the caliper and judging whether there is any abnormality in the outer diameter of the clamping rod bundle.

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