CN110265163B - Pellet tubulation process for nuclear fuel assembly - Google Patents
Pellet tubulation process for nuclear fuel assembly Download PDFInfo
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- CN110265163B CN110265163B CN201910578241.7A CN201910578241A CN110265163B CN 110265163 B CN110265163 B CN 110265163B CN 201910578241 A CN201910578241 A CN 201910578241A CN 110265163 B CN110265163 B CN 110265163B
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C21/00—Apparatus or processes specially adapted to the manufacture of reactors or parts thereof
- G21C21/02—Manufacture of fuel elements or breeder elements contained in non-active casings
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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Abstract
The invention relates to the technical field of nuclear fuel element manufacturing for a nuclear power station, in particular to a nuclear fuel assembly pellet tube loading process, which comprises the following steps that 25 fuel rods are supported by a bracket and moved to a rack; a push plate on a pushing cylinder in the fuel rod pushing manipulator device pushes 25 fuel rods to a front rack of an operation table, and the fuel rods are clamped between a first clamping air bag and a second clamping air bag; the material tray filled with the pellets is placed on the operating platform, the material-pushing double-shaft servo driving system controls the pushing head to push the pellets into the fuel rods one by one, the length of the pellets in each fuel rod is recorded, and the pellets on the material tray are continuously replaced until the fuel rods are filled with the pellets; the pellet tubulating process changes the working principle of manual pushing, and improves the stability of the pellet tubulating of the nuclear fuel assembly through precise servo driving, automatic mechanical interlocking and introduction of a digital system.
Description
Technical Field
The invention belongs to the technical field of nuclear fuel element manufacturing for a nuclear power station, and relates to a nuclear fuel assembly pellet tube-loading process.
Background
Nuclear power is used as low-carbon energy and is an important component of clean energy, and nuclear fuel assemblies are core components of a nuclear power unit reactor core, and the quality reliability of the nuclear fuel assemblies is directly related to the safety and the service life of a nuclear power station.
The nuclear fuel assembly has complex manufacturing process and high requirements on safety and reliability, the quality of the nuclear fuel assembly must be effectively detected after the nuclear fuel assembly is produced and manufactured, wherein pellet pushing and tubing is a key process, and the advancement or non-advancement and the reliability of the pellet tubing are directly related to the reliability of the quality of the nuclear fuel assembly.
Meanwhile, the equipment relates to dangerous goods operation and should be completed by adopting an automatic method as much as possible.
As the nuclear power industry in China is developed later, similar equipment is not available at home at present, manual pushing is generally adopted or high-cost foreign exchanges are imported from foreign countries, and the method has the following defects:
(1) because nuclear fuel pellet belongs to the hazardous articles, there is occupational health safety risk in artifical propelling movement.
(2) Because the nuclear fuel assembly has strict requirements on the quantity of the core block loading tubes, manual pushing is easy to miss pushing or push more than needed, and influences are caused on the product quality.
(3) The manual pushing force is inconvenient to control, the pushing force is easily too large, damage is caused to a fuel rod hollow pipe, or parameters of the pellets are unnecessarily abraded, the product quality is directly influenced, and the environmental pollution is increased.
(4) By adopting foreign import equipment, the key equipment technology is always mastered by others, which is not beneficial to the development of nuclear power strategy.
With the vigorous development of modern industry in China, the production tempo is continuously improved, the requirements on production efficiency, labor consumption and environment are higher and higher, and the existing mode cannot adapt to the current development situation.
Disclosure of Invention
In view of the above, the present invention provides a nuclear fuel assembly pellet tubulation process to solve the above-mentioned problems in the nuclear fuel assembly pellet tubulation process in the prior art.
In order to achieve the above object, the present invention provides a nuclear fuel assembly pellet tubulation process, comprising the steps of:
A. preparing a rod connecting device: the bracket with the lifting translation function supports 25 fuel rods and moves the fuel rods to the rack;
B. the fuel rod is in position: a push plate on a pushing cylinder in a fuel rod pushing manipulator device at the rear end of the rack pushes 25 fuel rods to a front rack of an operation platform, and the fuel rods are clamped between a first clamping air bag in the fuel rod air bag clamping device and a second clamping air bag of the fuel rod pushing manipulator device;
C. and (3) pushing the core blocks: the material tray with the pellets is placed on the operating platform, the pushing double-shaft servo driving system controls the pushing head to push the pellets into the fuel rods one by one, the length of the pellets in each fuel rod is recorded, and the pellets on the material tray are continuously replaced until the fuel rods are filled with the pellets;
D. unloading: the fuel rod pushing mechanical hand device is used for grabbing and shifting the fuel rod with the pellets.
Further, the pushing speed of the pushing head in the step C is reduced along with the increase of the pellets in the fuel rod.
Further, when the calculated residual length in the fuel rod is less than the length of one pellet in the step C, the material pushing double-shaft servo driving system calculates the length of the pellet needing to be supplemented and feeds the length back to an operator, so that the operator can conveniently take the pellet.
Further, the specific process flow of the step C is as follows:
a. a material block servo pushing driving device in the material pushing double-shaft servo driving system accurately moves to a first supporting position X1 (the supporting positions are X1-X25 in total), a servo pusher on the material block servo pushing driving device is corrected and started to push the core blocks, the core blocks are gradually close to a combined transition part of the core blocks and the fuel rods along a material tray channel, a photoelectric switch which starts to record the length when the core block at the foremost end moves forwards is shielded, the photoelectric switch sends SS to the system, and the first feeding length of the X1 fuel rod starts to record;
b. when a push head in the push head device shields a photoelectric probe for finishing the pushing of the core block, the photoelectric switch sends a signal SF to the system, the servo push machine stops advancing, the pulse data of the pushing length at this time is sent to the system, the database records the actual feeding length of the X1 position at this time, and the push head rises for a certain distance after returning to the X1 origin;
c. the servo material pusher moves transversely to the next material pushing position X2, X2 is the fuel rod loading original position, the loading action and the length recording which are the same as those of X1 are started until the pushing head is retreated to the original position of X2, and by analogy, X3-X25 fuel rods also finish the first loading, and the loading process from X1 to X2 is repeated until the first pellet is completely loaded;
d. changing a material tray on the operating platform, continuing to push, counting the trays by a servo system after each tray is loaded, gradually reducing the pushing speed at the later stage of pushing according to the air resistance, arranging a micro meter in a pushing head, and measuring the resistance in the material pushing process;
e. when the system counts and remains the last tray of core blocks to be pushed, the block actually does not use a tray according to the calculation, and the core block loading method on the tray comprises the following steps: and searching theoretical loading values of the fuel rods according to the accumulated values of the completed loading lengths of the fuel rods from X1 to X25 in the database, calculating the lengths of the to-be-loaded core blocks, calculating the lengths delta 1, delta 2 and … … delta 25 of the supplementary loading required by X1 and X2 … … X25 respectively, sending the lengths to a servo control system respectively, supplementing the materials according to the calculated lengths of the core blocks, and loading the materials by the same loading action as X1.
The utility model provides a nuclear fuel assembly pellet tubulation device, is including the frame that is used for placing the fuel rod, be located fuel rod gasbag clamping device and fuel rod propelling movement manipulator device on frame left side and right side respectively, fuel rod propelling movement manipulator device outside be provided with frame assorted operation panel, install the charging tray that is used for placing the pellet on the operation panel, operation panel outside fixed mounting has the device that pushes away that is used for propelling movement pellet, the device that pushes away is including pushing away the head and pushing away first elevating gear, fuel rod gasbag clamping device compresses tightly the cylinder and is used for the first centre gripping gasbag of centre gripping fuel rod one end including going up and down, fuel rod propelling movement manipulator device is including pushing away the material cylinder, bearing roller and the second centre gripping gasbag that is used for centre gripping fuel rod other end.
Furthermore, the pushing head device is electrically connected with a pushing double-shaft servo driving system, the pushing double-shaft servo driving system comprises a material block servo pushing driving device, a transposition servo driving device and a pellet guiding device, pellets are pushed into the fuel rods by the material block servo pushing driving device, the transposition servo driving device realizes accurate displacement of the material block servo pushing driving device, and the pellet guiding device plays a role in limiting the pellets entering the fuel rods.
And furthermore, the pushing head is electrically connected with a thrust detection system, the thrust detection system comprises a thrust conversion mechanism, a force detection sensor and a software system, and the real-time detection is carried out on the pellet tube loading process.
Furthermore, the first clamping air bag and the second ear clamping air bag are electrically connected with a barometer for adjusting air pressure in the clamping air bags.
And the PLC control system is in signal connection with the thrust detection system and comprises a monitoring layer and a control layer.
Furthermore, the operation panel of charging tray both sides is last fixed mounting to be used for the fixed locating pin of charging tray, and fixed mounting has three groups of locating pieces on the operation panel.
Further, a bracket used for guiding the fuel rod is rotatably arranged on the rack, and a plurality of grooves are uniformly formed in the bracket.
The invention has the beneficial effects that:
1. the nuclear fuel assembly pellet tubulation process disclosed by the invention adopts a material-pushing double-shaft servo drive pushing process, thereby realizing the digitization of the pushing process, including stepless adjustment of the speed, obviously improving the positioning precision and reducing the start-stop impact.
2. The nuclear fuel assembly pellet tubulation process disclosed by the invention can realize intelligent tubulation and intelligent statistics of the number of the remaining pellets, namely in the continuous batch tubulation process, by means of a servo system, a system can record the length of the loaded pellets, obtain the length of the remaining pellets through an algorithm, and automatically push the pellets with the corresponding length into a fuel rod hollow tube in the last disk pushing process. The manual measurement and counting are avoided, the operation intensity is reduced, fewer or more containers are produced due to manual errors, the production efficiency is improved, and the tube filling quality is ensured.
3. The nuclear fuel assembly pellet tubulation process disclosed by the invention thoroughly changes the working principle of manual pushing, improves the stability of nuclear fuel assembly pellet tubulation through precise servo driving, automatic mechanical interlocking and introduction of a digital system, ensures more reliable quality, improves the automation degree of equipment, lightens the labor intensity of workers and reduces the occupational health risk of the workers; meanwhile, the device is systematically and safely designed, the safety and the reliability are greatly improved compared with the traditional mode, and the novel nuclear fuel assembly servo pushing pellet tubulation device developed by the patent has a great popularization and application value in the field of current nuclear fuel assembly production.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic structural view of a nuclear fuel assembly pellet tubulation apparatus of the present invention;
fig. 2 is a top view of the nuclear fuel assembly pellet tubulation apparatus of the present invention.
Reference numerals are as follows: the device comprises a rack 1, a fuel rod pushing manipulator device 2, a fuel rod air bag clamping device 3, a push head device 4, a pushing double-shaft servo driving system 5 and a guide rail 6.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.
The nuclear fuel assembly pellet tubulation device shown in figures 1-2 belongs to electromechanical integrated numerical control equipment, and an aluminum alloy frame is adopted as a whole to be matched with a conveying line to complete the pellet tubulation work of a hollow fuel rod tube. The fuel rod pushing manipulator device comprises a rack 1 for placing fuel rods, a fuel rod air bag clamping device 3 and a fuel rod pushing manipulator device 2, wherein the fuel rod air bag clamping device 3 and the fuel rod pushing manipulator device 2 are respectively located on the left side and the right side of the rack 1. The fuel rod air bag clamping device 3 has the functions of: when the fuel rods are subjected to tube loading and pushing actions, the fuel rods are tightly pressed, so that the fuel rods are not displaced, and the stability and reliability of pushing are ensured. Meanwhile, the rigidity of the hollow fuel rod tube is very weak, and the clamping force cannot be too large so as to avoid the hollow fuel rod tube being pressed and deformed. Thus requiring a fine tuning of the clamping device. The effect of charge bar propelling movement manipulator device does: and pushing the fuel rod from the transmission position to the tube loading position, and pulling the fuel rod back to the transmission position from the tube loading position after the tube loading is completed so that the fuel rod enters the next working procedure.
The fuel rod air bag clamping device 3 comprises a lifting compression cylinder and a first clamping air bag used for clamping one end of a fuel rod, and the fuel rod pushing manipulator device 2 comprises a pushing cylinder, a carrier roller and a second clamping air bag used for clamping the other end of the fuel rod. The first clamping air bag and the second ear clamping air bag are electrically connected with a barometer for adjusting air pressure in the clamping air bag. The fuel rod air bag clamping device 3 has the advantages that: the clamping is reliable, the adjustment is convenient, and the occupied space is small.
The outside of the fuel rod pushing mechanical arm device 2 is provided with an operating platform matched with the rack 1, a material tray used for placing pellets is installed on the operating platform, positioning pins used for fixing the material tray are fixedly installed on the operating platforms on the two sides of the material tray, and after the material tray is placed on the operating platform, the positioning pins play the effects of automatic positioning and quick clamping of the material tray. Three groups of positioning blocks are fixedly arranged on the operating platform, and the positioning blocks play a role in positioning the material tray. A push head device 4 for pushing the core block is fixedly arranged on the outer side of the operating platform, and the push head device 4 comprises a push head and a push head lifting device. The pushing head device 4 is electrically connected with a pushing double-shaft servo driving system 5, the pushing double-shaft servo driving system 5 comprises a material block servo pushing driving device, a transposition servo driving device and a pellet guiding device, pellets are pushed into the fuel rods by the material block servo pushing driving device, the transposition servo driving device realizes accurate displacement of the material block servo pushing driving device, and the pellet guiding device plays a limiting role in limiting the pellets entering the fuel rods.
The pushing head is electrically connected with a thrust detection system, the thrust detection system comprises a thrust conversion mechanism, a force detection sensor and a software system, and real-time detection is carried out on the pellet tube loading process. The pushing head adopts a special design size, can meet the requirement of pushing the core block for tubing, does not interfere with the material tray and the guiding device, and can be replaced after being worn.
The pushing head lifting device is used for lifting the pushing head once the pushing is finished and accurately moving the pushing head to the next row of material blocks of the material tray under the action of the transposition mechanism.
The thrust detection system is an innovative design of the patent, and can detect the thrust in real time in the pellet tubulation process so as to stop the push block in time when a problem occurs and protect equipment and a workpiece.
The device also comprises a PLC control system in signal connection with the thrust detection system, and the PLC control system comprises a monitoring layer and a control layer. The system adopts Siemens S1200 series PLC as a main controller, an HMI human-machine interface finishes system monitoring and pellet tubulation management, and a servo control system is adopted for a driving device with high requirement on operation stability. The whole electric control system is divided into a monitoring layer and a control layer, and in order to ensure the safe and reliable operation of the pellet tubulation process research equipment and the seamless butt joint of sideline equipment and a whole line, a safe operation protection system, a software and hardware redundant butt joint system and the like are arranged in the equipment control system.
1) The hardware circuit design meets the requirements of safety and reliability, and the panel installation meets the requirements of reasonable layout, convenient operation and elegant appearance;
2) The software design meets the technological requirements of products, and the system has multiple manual/semi-automatic/full-automatic working operation modes, and all operation actions are interlocked, so that the safety and operability of equipment are ensured; the HMI man-machine interface meets the requirements of convenient and visual operation and has the functions of state monitoring, fault diagnosis authority management and the like;
3) The tube loading process can be set at will, and the requirements of various tube loading functions are met.
4) And a system reservation and production management informatization system interface.
The rack 1 system is assembled by aluminum profiles, is light and beautiful, and simultaneously adopts a plurality of rigid reinforcements to ensure that higher mechanical precision can be obtained on the basis of aluminum profiles. Meanwhile, in order to ensure the repeated positioning precision of the tray replacement, three positioning blocks and two position positioning pins are arranged below the tray, so that the tray replacement is convenient, and meanwhile, the tray is also matched with the pushing head and the guiding device in a precise center, and plays an important role in the quality of the pellet tubulation.
A tube loading process of a nuclear fuel assembly pellet tube loading device comprises the following steps:
A. preparing a rod connecting device: 25 fuel rods are supported by lifting and translating brackets and are moved to the front of the tube filling machine, the brackets are 7 polyethylene rods (each is provided with 25 grooves), and the brackets are translated back to the position of the tube filling machine through rodless cylinders and are lowered to the original position;
B. the fuel rod is in position: a push plate on a pushing cylinder in a tube filling machine frame 1 rear end fuel rod pushing manipulator device 2 pushes 25 fuel rods in place, and the fuel rods are clamped between a first clamping air bag and a second clamping air bag;
C. and (3) pushing the core block: the material tray with the pellets is placed on the operating platform, the material pushing double-shaft servo driving system 5 controls the pushing heads to push the pellets into the fuel rods one by one, the length of the pellets in each fuel rod is recorded, the pellets on the material tray are continuously replaced until the fuel rods are filled with the pellets, and the pushing speed of the pushing heads is reduced along with the increase of the pellets in the fuel rods; when the calculated residual length in the fuel rod is less than the length of one pellet, the material pushing double-shaft servo driving system 5 calculates the length of the pellet needing to be supplemented and feeds the length back to an operator, so that the operator can conveniently take the pellet.
The specific working process comprises the following steps: the servo translation driving device accurately moves the pushing mechanism to a first supporting position X1 (the supporting positions are X1-X25 in total), the servo pushing mechanism calibrates the original position, the servo mechanism is started, the push head is lowered to the working position, and the air cylinder is in place and the magnetic switch sends a signal. The servo mechanism starts to push, the core blocks gradually draw close to the combination transition part along the material tray channel, when the core block at the most front end moves forwards, the photoelectric switch sensor1 which starts to record the length is shielded, the photoelectric switch sends a signal SS to the system, and the first-time loading length of the X1 fuel rod starts to record.
When the pushing head body of the pushing head shields the photoelectric probe for finishing the pushing of the core block, the photoelectric switch sends a signal SF to the system, the servo pushing machine stops advancing, the pulse number data of the pushing length at this time is sent to the system, and the database records the actual feeding length of the X1 bit at this time. (the push head is longer than the push head body by a fixed value of more than 8-10 mm due to structural design; the upper photoelectric switch and the lower photoelectric switch respectively detect the material block and the push head body at different heights of the same plumb line so as to confirm the length of the current paint, wherein the material pushing length is equal to the length calculated by a servo system minus the fixed value of 8-10 mm).
After the pushing head returns to the X1 origin, the pushing head rises for a certain distance.
The servo material pusher moves transversely to the next material pushing position and the X2 fuel rod loading original position; the same loading action and length recording as XI is started until the pusher is retracted to the home position of X2.
By analogy, the fuel rods from X3 to X25 are also charged for the first time.
The loading process from X1 to X2 is repeated until the first tray of core blocks is completely loaded.
The material tray is replaced, the pushing is continued, the servo system counts the trays when the tray is completed, meanwhile, the pushing speed is gradually reduced (the experiment is optimized in the debugging process) in the later stage of the pushing according to the air resistance, and a micro meter (the same dynamometer as the rod pulling machine is adopted at this time, but the tension force is measured instead of the pressure) is arranged in the pushing head to measure the resistance of the material pushing process.
When the last disc is left in the system counting, according to the calculation, the material block can not actually reach the last disc, the process flow of the following 2.7 points is adopted for pushing, and all 25 fuel rods are pushed.
The charging method for the coil material with the final length less than one comprises the following steps:
according to the accumulated value of the finished charging lengths of the X1-X25 fuel rods in the database, the theoretical charging value of the fuel rods is found to be 3657.6 mm, the supplementary charging lengths delta 1, delta 2 and … … delta 25 required by the X1 and the X2 … … X25 are respectively calculated and are respectively sent to a servo control system in a time sharing mode.
Referring to the charging process of X1, the charging for X1 is started, when a Sensor1 signal is sent out, a servo system starts, and the charging length for supplementing is delta 1 (pulse), wherein the charging length delta 1 for supplementing is controlled by the servo system. The pusher head then retreats to the origin of loading of X1.
And blowing air to the side of the material tray by a compressed air blowing nozzle positioned between the combination device and the material tray port to blow one pellet off the material channel (which can indicate the mark of the end of the total loading amount and is convenient for the long-term signaling of the loading of the next fuel rod), and repeating until the X25 fuel rod finishes the supplement loading of the last tray.
D. Unloading: the fuel rod pushing manipulator device 2 grabs and shifts the fuel rod with the pellets.
The innovation points of the tube loading process of the nuclear fuel assembly pellet tube loading device are as follows:
1. by adopting the double-shaft servo pushing system, the precision and the rigidity are improved, and the gradual change characteristic of the pushing speed is realized.
This project adopts the servo push system of biax, realizes pushing away the diaxon motion of head through servo motor, accurate ball and 6 devices of linear guide 6, has improved the precision and the rigidity of pellet propelling movement greatly. Meanwhile, a closed loop system formed by the servo material returning mechanism has a function of stepless speed adjustment and can perform gradual speed adjustment according to the optimal process route of the material pushing process.
Firstly, in each material pushing process, acceleration and deceleration are set through a numerical control system, so that the movement stability of the pushing head is improved, the starting and stopping impact is reduced, the quality of the pellet material pushing process is ensured, the abrasion of pellets is reduced, and the damage and the influence on a guide device and a fuel rod blank tube in the tube loading process are greatly reduced.
Secondly, in the process of continuously pushing materials, along with the increase of the number of the inner core blocks of the empty tube of the fuel rod, the air assistance in the pushing process is gradually increased, if the speed is not adjusted, the speed is always kept at one speed, the subsequent pushing process is caused, and the tube loading quality is influenced due to the pulsation phenomenon caused by the increase of the pushing resistance. This patent is through servo feedback control, carries out gradual change adjustment to speed pushing away the material in-process, has improved tubulation efficiency and tubulation quality. Is a great innovation for the prior production technology.
2. Fuel rod empty tube pushing manipulator with innovative design
Before loading, 25 empty fuel rods need to be pushed flat, clamped and then fed into the guide device. This patent innovative design a novel manipulator that propelling movement snatched, through multiunit mechanism in coordination each other, realize in narrow and small space that push away flat, centre gripping, propelling movement, fuel rod are stable and with carry now counterpoint all actions such as matching. The mechanism is exquisite, the adjustment is convenient, has reduced equipment space and has occupied. Ensuring that the 25 and the empty tube of the fuel rod are accurately aligned with the tube opening before tube loading.
3. Intelligent tubulation
The device can realize intelligent tube loading and intelligent statistics of the number of residual pellets, and the process of the pellet tube loading process research device system can be seen, the intelligent tube loading process for pellets is innovatively developed by the project through a servo system, a detection device and a software system, namely, in the continuous batch tube loading process, the system can record the length of the loaded pellets, the length of the residual pellets is obtained through an algorithm, and the pellets with the corresponding length are automatically pushed into a hollow fuel rod in the last disk pushing process. The manual measurement and counting are avoided, the operation intensity is reduced, fewer or more devices are produced due to manual errors, the production efficiency is improved, and the tube loading quality is ensured.
4. Real-time detection of thrust in pushing process
In the process of pushing the pellets into the empty fuel rod pipe, if an accident (such as pellet blockage, unqualified self-bending degree of the fuel rod and the like) occurs, the resistance is too large, if a host system cannot find the hidden danger in real time, serious production accidents can be caused, and equipment or fuel rod workpieces are damaged. And the data of the thrust is transmitted to the main control system in real time, so that the host can clearly know whether the abnormity occurs in the pushing process. And the shutdown alarm action is taken in time, so that the safety and reliability of production are greatly improved.
Meanwhile, in the process of pushing material overload, along with the increase of the number of the inner core blocks of the hollow tube of the fuel rod, the air assistance in the pushing process is gradually increased, the pushing speed must be gradually adjusted, and through real-time detection of the thrust, efficient speed adjustment can be carried out according to the change condition of the thrust. The tube loading efficiency is improved.
5. Real-time protection of processing zones during production
In the process of pushing the pellets into the hollow fuel rod tube, if an abnormal object enters the processing area from the outside, the pushing action is stopped in time until the abnormal object leaves the range of the processing area, the equipment recovers to operate normally, and the safety and reliability of production are improved by the arrangement of the protection function.
Compared with the traditional cylinder pushing pipe process technology tested by manual pipe loading and even individual manufacturers, the pipe loading process method of the nuclear fuel assembly pellet pipe loading device improves the automation and intelligence degree, greatly reduces the contact time between workers and uranium blocks, avoids the problem of missing or multiple loading possibly caused by manual pipe loading through a numerical control technology, is a great innovation, achieves good effect through practical application, and is worthy of popularization.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (3)
1. A nuclear fuel assembly pellet tubulation process, characterized by comprising the following steps:
A. preparing a rod connecting device: the bracket with the lifting translation function supports 25 fuel rods and moves the fuel rods to the rack;
B. the fuel rod is in place: a push plate on a pushing cylinder in a fuel rod pushing manipulator device at the rear end of the rack pushes 25 fuel rods to a front rack of an operation platform, and the fuel rods are clamped between a first clamping air bag in the fuel rod air bag clamping device and a second clamping air bag of the fuel rod pushing manipulator device;
C. and (3) pushing the core blocks: the material tray with the pellets is placed on the operating platform, the pushing double-shaft servo driving system controls the pushing head to push the pellets into the fuel rods one by one, the length of the pellets in each fuel rod is recorded, and the pellets on the material tray are continuously replaced until the fuel rods are filled with the pellets;
the specific process flow is as follows:
a. a material block servo pushing driving device in the material pushing double-shaft servo driving system accurately moves to a first pushing position X1, wherein the pushing positions are X1-X25 in total, a servo pusher on the material block servo pushing driving device is corrected and started to push the pellets, the pellets gradually approach to a combined transition part of the pellets and the fuel rods along a material tray channel, a photoelectric switch which starts to record the length when the most front pellet moves forwards is shielded, the photoelectric switch sends SS to the system, and the first feeding length of the X1 fuel rods starts to record;
b. when a push head in the push head device shields a photoelectric probe for finishing the pushing of the core block, the photoelectric switch sends a signal SF to the system, the servo push machine stops advancing, the pulse data of the pushing length at this time is sent to the system, the database records the actual feeding length of the X1 position at this time, and the push head rises for a certain distance after returning to the X1 origin;
c. the servo material pusher moves transversely to the next material pushing position X2, X2 is the fuel rod loading original position, the loading action and the length recording which are the same as those of X1 are started until the pushing head is retreated to the original position of X2, by analogy, X3-X25 fuel rods also complete the first loading, and the loading process from X1 to X2 is repeated until the first pellet is completely loaded in one disc;
d. changing a material tray on the operating platform, continuing to push, counting the trays by a servo system after each tray of core blocks is loaded, gradually reducing the pushing speed at the later stage of pushing according to the air resistance, arranging a micro meter in the pushing head, and measuring the resistance in the material pushing process;
e. when the system counts and has the last tray of core blocks to be pushed, the block can not actually use one tray according to the calculation, and the core block loading method on the tray comprises the following steps: according to the accumulated value of the finished loading lengths of the fuel rods from X1 to X25 in the database, searching the theoretical loading value of the fuel rods, calculating the lengths of the to-be-loaded core blocks, calculating the lengths delta 1, delta 2 and … … delta 25 of the supplementary loading required by X1 and X2 … … X25 respectively, sending the lengths to a servo control system respectively, feeding materials according to the calculated lengths of the core blocks, and loading materials by the same loading action as X1;
D. unloading: the fuel rod pushing mechanical hand device is used for grabbing and shifting the fuel rod with the pellets.
2. A nuclear fuel assembly pellet tubulation process as claimed in claim 1 wherein in step C the pushing speed of the pusher head decreases with increasing pellets in the fuel rod.
3. A nuclear fuel assembly pellet tubulation process as claimed in claim 1, wherein in step C, when the calculated remaining length of the fuel rod is less than the length of one pellet, the pusher bi-axial servo driving system calculates the length of the pellet to be supplemented and feeds the length back to the operator, thereby facilitating the operator to take the pellet.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| FR1234186A (en) * | 1959-05-11 | 1960-10-14 | Commissariat Energie Atomique | Improvement in cladding processes for nuclear reactor fuel elements |
| CN109599200A (en) * | 2018-12-29 | 2019-04-09 | 中核北方核燃料元件有限公司 | A kind of automatic tubulature device of presurized water reactor pellet |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4235066A (en) * | 1978-05-30 | 1980-11-25 | General Electric Company | Nuclear fuel rod loading apparatus |
| JP4262681B2 (en) * | 2002-12-24 | 2009-05-13 | ベルゴニュークレール・ソシエテ・アノニム | Method and apparatus for manufacturing non-polluting MOX fuel rods |
| US7593501B2 (en) * | 2005-01-06 | 2009-09-22 | Areva Np Inc. | Segment make-up system and method for manufacturing nuclear fuel rods |
| CN103943160B (en) * | 2014-05-07 | 2017-01-18 | 中国核动力研究设计院 | Device for unloading fuel pellet |
| CN106531260B (en) * | 2016-11-25 | 2018-07-27 | 中核建中核燃料元件有限公司 | A kind of fuel rod end plug corking machine and application method |
| CN107274945B (en) * | 2017-08-01 | 2023-04-25 | 中机中联工程有限公司 | Nuclear fuel assembly pull rod production system |
| CN109741844B (en) * | 2018-12-29 | 2022-10-21 | 中核北方核燃料元件有限公司 | Automatic core block pipe installing device |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1234186A (en) * | 1959-05-11 | 1960-10-14 | Commissariat Energie Atomique | Improvement in cladding processes for nuclear reactor fuel elements |
| CN109599200A (en) * | 2018-12-29 | 2019-04-09 | 中核北方核燃料元件有限公司 | A kind of automatic tubulature device of presurized water reactor pellet |
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