CN114353617A - Nuclear power station reactor protection tube assembly position measuring tool - Google Patents
Nuclear power station reactor protection tube assembly position measuring tool Download PDFInfo
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- CN114353617A CN114353617A CN202111655621.XA CN202111655621A CN114353617A CN 114353617 A CN114353617 A CN 114353617A CN 202111655621 A CN202111655621 A CN 202111655621A CN 114353617 A CN114353617 A CN 114353617A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/0011—Arrangements for eliminating or compensation of measuring errors due to temperature or weight
Abstract
The invention belongs to the field of nuclear power station reactor maintenance, and particularly relates to a position measuring tool for a nuclear power station reactor protection tube assembly, which comprises: the measuring tool comprises a measuring tool body, a measuring pawl, a digital display measuring instrument and a vernier caliper, wherein the vernier caliper is fixed on the measuring tool body, a sliding groove is formed in the middle position, corresponding to the position of the vernier caliper, of the measuring tool body, the digital display measuring instrument is installed in the sliding groove of the measuring tool body, the measuring pawl is slidably installed on the measuring tool body, and the digital display measuring instrument is correspondingly connected with the measuring pawl. The invention solves the problem of interference with on-site maintenance space objects in the use process of the existing tool, improves the measurement accuracy, shortens the measurement time, reduces the stay time of personnel in a high-temperature environment, and reduces the physical energy consumption of the personnel.
Description
Technical Field
The invention belongs to the field of nuclear power station reactor maintenance, and particularly relates to a position measuring tool for a nuclear power station reactor protection tube assembly.
Background
The first project of the Tianwan nuclear power plant is two VVER-1000 type units, and the reactor is a B-428 type reactor. The reactor comprises components such as a reactor pressure vessel, a reactor core hanging basket, a reactor core coaming, a protection tube component, a fuel component, a control rod component, an upper component, a protection steel structure and a control rod driving mechanism, wherein the protection tube component is a welded metal structure and mainly acts as: precise positioning and isolation of the fuel assembly head in height and in the core plane; arranging a control rod assembly protection tube and a neutron-temperature measuring tube to prevent the control rod assembly and the neutron-temperature measuring sensor from being under the power action of a coolant and ensure the control rod to fall reliably; a certain pressure is established at the upper end of the fuel assembly to ensure that the fuel assembly does not float upwards; uniformly mixed coolant flow is formed at the outlet of the reactor core and the inlet of the mixing cavity at the upper part of the reactor; for mounting a steel "hot" supervision sample box for a reactor vessel.
In order to ensure that the running state of the unit is kept stable continuously, the position change of the protection pipe assembly in the reactor core needs to be monitored regularly. According to the requirements of LYG-9-JA0.IS-M030, the position of a protection pipe assembly is measured in each overhaul, unstacking and stacking stage of a reactor of a nuclear power plant of the Tianwan gulf, the main measuring points are shown in figure 1, and the periodic measuring data comprises: distance from the surface of the basket flange to the surface of the pressure vessel flange; the distance from the flange of the protective tube assembly to the surface of the flange of the pressure vessel; the thickness of the flange of the shoulder of the protection pipe component comprises an upper gasket and a lower gasket.
The protection tube assembly requires high precision in position measurement, and the precision requirement of the measured value is 0.01 mm. When the field maintenance personnel measure the position of the protection pipe assembly, a precision measuring tool needs to be used, and in the prior art, the maintenance personnel always use the traditional measuring tool (vernier caliper and height vernier caliper) to measure the position of the protection pipe assembly in the pressure vessel.
Conventional universal measuring tools have problems in use:
the upper cantilever of the height vernier caliper is short, and cannot extend to the main sealing flange surface when being matched with the flange surface of the pressure vessel for measurement;
the height vernier caliper has the advantages that the height vernier caliper has an oversize base, and has interference with a shoulder of the protection tube assembly, so that the base and the hanging basket have interference, and the measurement accuracy of the height vernier caliper is reduced;
when the length vernier caliper is used for measurement, the two lower pawls are too short to be completely matched with the flange of the protection pipe for clamping, and the measurement accuracy of the vernier caliper can be reduced.
In conclusion, in the process of actually measuring the position of the protection tube assembly in the maintenance site, the mounting position limited to the shoulder of the protection tube assembly is lower than the flange surface of the pressure vessel, the fit clearance among the pressure vessel body, the protection tube assembly and the hanging basket is narrow, and the operation space for implementing measurement is narrow.
Disclosure of Invention
The invention aims to provide a position measuring tool for a reactor protection tube assembly of a nuclear power station, which solves the problem of interference with an object in a field maintenance space in the using process of the existing tool, improves the measuring accuracy, shortens the measuring time, reduces the stay time of personnel in a high-temperature environment, and reduces the physical energy consumption of the personnel.
The technical scheme for realizing the purpose of the invention is as follows:
a nuclear power plant reactor protection tube assembly position measurement tool, the measurement tool comprising: the measuring tool comprises a measuring tool body, a measuring pawl, a digital display measuring instrument and a vernier caliper, wherein the vernier caliper is fixed on the measuring tool body, a sliding groove is formed in the middle position, corresponding to the position of the vernier caliper, of the measuring tool body, the digital display measuring instrument is installed in the sliding groove of the measuring tool body, the measuring pawl is slidably installed on the measuring tool body, and the digital display measuring instrument is correspondingly connected with the measuring pawl.
The measuring tool further comprises a sliding sleeve, the digital display measuring instrument is fixed on the sliding sleeve, two positioning pins are installed on the sliding sleeve, the sliding sleeve is installed in the sliding groove of the measuring tool body through the positioning pins, and the digital display measuring instrument is installed in the sliding groove of the measuring tool body through the sliding sleeve.
The measuring pawl is connected with a connecting sleeve, and the positioning pin on the sliding sleeve is fixedly connected with the connecting sleeve on the measuring pawl.
The measuring pawl is connected with the connecting sleeve in a welding mode.
The measuring pawl is provided with a return spring, and the return spring is positioned through a positioning screw arranged on the measuring tool body.
The digital display measuring instrument comprises a first digital display measuring instrument, a second digital display measuring instrument and a third digital display measuring instrument, wherein the first digital display measuring instrument is positioned in the 12 o' clock direction of the measuring tool body and is positioned at the upper part of the measuring tool body; the third digital display measuring instrument is positioned in the 9 o' clock direction of the measuring tool body and is positioned in the middle of the measuring tool body; the second digital display measuring instrument is positioned at the 3 o' clock direction of the measuring tool body and is positioned at the lower part of the measuring tool body.
The measuring pawl comprises an upper measuring pawl, a middle measuring pawl and a lower measuring pawl, and the lower measuring pawl is positioned in the 3 o' clock direction of the measuring tool body and is positioned at the lower part of the measuring tool body; the upper measuring pawl is positioned in the 9 o' clock direction of the measuring tool body and is positioned in the middle of the measuring tool body; the middle measuring pawl is positioned in the 3 o' clock direction of the measuring tool body and is positioned at the middle lower part of the measuring tool body.
The sliding sleeve of the third digital display measuring instrument is fixedly connected with the connecting sleeve on the upper measuring pawl through the positioning pin, the sliding sleeve of the second digital display measuring instrument is fixedly connected with the connecting sleeve on the middle measuring pawl through the positioning pin, and the sliding sleeve of the first digital display measuring instrument is fixedly connected with the connecting sleeve on the lower measuring pawl through the positioning pin.
The lower measuring pawl is of a rotatable structure and rotates in a circumferential direction in a sliding groove formed in the bottom of the measuring tool body.
The measuring tool further comprises a measuring handle, the measuring handle is located at the top of the measuring tool body, the measuring handle rotates in the circumferential direction in a sliding groove formed in the top of the measuring tool body, and the measuring handle is connected with the lower measuring pawl.
The vernier caliper is detachably mounted on the measuring tool body.
The measuring tool further comprises a checking platform, the checking platform comprises a first measuring step, a second measuring step and a third measuring step, the first measuring step is located at the topmost part of the checking platform, the second measuring step is located in the middle of the checking platform, and the third measuring step is located at the bottom of the checking platform.
The height of the first measuring step is 115mm, the height of the second measuring step is 40mm, and the height of the third measuring step is 15 mm.
The invention has the beneficial technical effects that:
1. the position measuring tool for the nuclear power station reactor protection tube assembly can measure the values of the A, the B and the F at the measuring position point at one time, does not need to measure the values at the same measuring point for 3 times, and reduces the measuring times.
2. The position measuring tool for the nuclear power station reactor protection tube assembly distinguishes measuring errors of required data measurement and 3 times of measurement of the same measuring point at one time, and actually, when the measuring tool is used for measuring 3 times by using a traditional tool, the measuring tool and each part are not necessarily matched on the same radial axis, so that the effectiveness of 3 measured values is reduced, and the position analysis of a subsequent protection tube assembly in a pressure container is influenced.
3. According to the position measuring tool for the nuclear power station reactor protection tube assembly, the length of the pawl matched with the pressure surface is increased, so that the pawl is fully matched with the main sealing surface of the pressure container, and in addition, the matching surface of the pawl is enlarged, so that the pawl is more stable when being matched with the pressure container. 4. According to the tool for measuring the position of the protection tube assembly of the nuclear power station reactor, the pawl matched with the protection tube is designed into a rotatable structure, the pawl does not need to rotate together with the measuring tool body when a traditional tool is used for measuring so as to be fully matched with the flange surface of the protection tube assembly, the measuring tool body does not need to rotate, and only the corresponding measuring pawl needs to rotate, so that the full matching with the flange surface of the protection tube assembly can be realized, the condition that the measuring pawl is interfered with a measuring object is avoided, and the measuring accuracy is improved.
5. The position measuring tool for the reactor protection tube component of the nuclear power station also comprises a calibration platform. When the device works on site, the measuring tool can be placed on the checking platform at any time to be reset to zero and corrected according to the use condition of the measuring tool, the existence of measurement deviation of the measuring tool can be found at any time, and the accuracy and the reliability of measured data are improved; the problem of traditional instrument can only realize the operation of returning to zero, can not realize carrying out real-time, convenient, swiftly correcting at the calibration platform is solved.
6. The tool for measuring the position of the protection tube component of the nuclear power station reactor can directly measure the gamma value, thereby subverting the idea that the gamma value can be obtained by repeatedly measuring and calculating for many times by using the traditional tool, improving the measurement efficiency, reducing the measurement time and saving the manpower.
7. The position measuring tool for the reactor protection tube component of the nuclear power station uses a new vernier caliper structure, and is matched with the measuring tool body to actually form a detachable and reinstalled structure, so that the new measuring tool is periodically checked every year, the whole set of tool is not required to be taken for checking, and only 3 vernier calipers are required to be taken down to be sent to a laboratory for checking. The rest measuring tool bodies and the calibration platform are pure metal material mechanisms, are stable and are not easy to deform, and therefore periodic calibration is not needed.
Drawings
FIG. 1 is a schematic view of a position measurement of a protective tube assembly;
FIG. 2 is a schematic view of the protective tube assembly in an operative position within the pressure vessel;
FIG. 3 is a schematic view of the location of the protective tube assembly installed in the pressure vessel;
fig. 4 is a schematic structural diagram of a calibration platform for a position measurement tool of a reactor protection tube assembly of a nuclear power plant according to the present invention;
fig. 5 is a schematic structural diagram of a tool for measuring a position of a reactor protection tube assembly of a nuclear power plant according to the present invention;
fig. 6 is a schematic structural diagram of a sliding sleeve in a position measuring tool for a reactor protection tube assembly of a nuclear power plant according to the present invention;
fig. 7 is a schematic structural diagram of an upper measuring pawl in a position measuring tool for a reactor protection tube assembly of a nuclear power plant according to the present invention;
fig. 8 is a schematic structural diagram of a middle measuring pawl in a position measuring tool for a reactor protection tube assembly of a nuclear power plant according to the present invention;
fig. 9 is a schematic structural diagram of a lower measuring pawl in a position measuring tool for a reactor protection tube assembly of a nuclear power plant according to the present invention;
fig. 10 is a schematic view of a measuring tool body top chute (for accommodating a measuring handle) in a position measuring tool of a reactor protection tube assembly of a nuclear power plant provided by the invention;
FIG. 11 is a view A-A of FIG. 10;
fig. 12 is a schematic view of a bottom chute (for accommodating a lower measuring pawl) of a measuring tool body in a position measuring tool for a reactor protection tube assembly of a nuclear power plant provided by the invention;
fig. 13 is a view B-B of fig. 12.
In the figure: 1-pressure vessel top cover; 2-a protective tube assembly; 3, hanging baskets; 4-enclosing plates; 5-monitoring the sample; 6-a fuel assembly; 7-a pressure vessel body; 8-main seal ring; 9-a spring tube assembly; 10-shoulder upper backing plate; 11-shoulder lower backing plate; 12-flange shoulder; 13-a first measuring step; 14-a second measuring step; 15-a third measuring step; 16-a measuring handle; 17-a first digital display measuring instrument; 18-a second digital display measuring instrument; 19-a third digital display measuring instrument; 20-upper measuring pawl; 21-intermediate measuring pawl; 22-lower measuring pawl; 23-measuring the tool body; 24-a sliding sleeve; 25-positioning pin.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
As shown in fig. 1, the position measurement work of the protection pipe assembly is performed by the following main measurement points:
(1) the value of the A is the distance from the flange surface of the hanging basket to the flange surface of the pressure vessel;
(2) the B value is the distance from the flange of the protection pipe assembly to the surface of the flange of the pressure vessel;
(3) the back value is the thickness of the flange of the shoulder of the protection pipe assembly and comprises an upper gasket and a lower gasket.
The specific measurement positions of the land, the b and the backweb are shown in detail in fig. 1, and then the value f (the distance from the lower surface of the shoulder of the protection tube component to the surface of the flange of the hanging basket) is calculated through a formula of the land-b-backweb, wherein the operation requirement of reactor equipment is met when the acceptance standard of the value f is within the range of 16-21 mm.
The protective tube assembly is shown in a schematic view in an installed and operating position in a pressure vessel, as shown in fig. 2-3.
As shown in fig. 4 to 6, the present invention provides a tool for measuring a position of a reactor protection tube assembly of a nuclear power plant, including: the measuring tool comprises a measuring tool body 23, a measuring pawl, a digital display measuring instrument, a measuring handle 16, a sliding sleeve 24, a vernier caliper and a calibration platform. The measuring pawl comprises a lower measuring pawl 22, a middle measuring pawl 21 and an upper measuring pawl 20, and the digital display measuring instruments comprise a first digital display measuring instrument 17, a second digital display measuring instrument 18 and a third digital display measuring instrument 19.
The whole appearance of measuring tool body 23 presents for cylindricly, slide caliper fixes on measuring tool body 23, offer the spout that is used for providing digital display measuring instrument and slides from top to bottom with the measuring pawl on measuring tool body 23 on the intermediate position that corresponds with slide caliper position, digital display measuring instrument passes through sliding sleeve 24 and installs in the spout of measuring tool body 23, slide from top to bottom in the spout of measuring tool body 23, measuring pawl slidable mounting is on measuring tool body 23, digital display measuring instrument corresponds with the measuring pawl and is connected, measuring handle 16 installs on measuring tool body 23, measuring handle 16 is connected with the measuring pawl.
The digital display measuring instrument is fixed on the sliding sleeve 24 through a connecting fastener, two positioning pins 25 are installed on each measuring instrument sliding sleeve 24, the two positioning pins 25 can slide up and down in the sliding grooves in the measuring tool body 23, and the positioning pins 25, the sliding sleeve 24 and the digital display measuring instrument are connected into a whole, so that the positioning pins 25, the sliding sleeve 24 and the digital display measuring instrument can slide up and down along the sliding grooves in the measuring tool body 23.
The vernier caliper is fixed on the measuring tool body 23, the gauge outfit of the digital display measuring instrument is installed above the vernier caliper, the digital display measuring instrument slides up and down along the vernier caliper in the slide way, and the reading of the digital display measuring instrument changes continuously while sliding.
The positioning pin 25 on the sliding sleeve 24 is fixedly connected with the connecting sleeve on the measuring pawl, and when the measuring pawl moves up and down, the connecting sleeve, the sliding sleeve 24 and the digital display measuring instrument are driven to move up and down together.
The measuring pawl is connected with the connecting sleeve in a welding mode, and in order to prevent the deformation of the measuring pawl and the connecting sleeve in the welding process, a vacuum electron beam welding mode is adopted, so that the phenomenon that the mechanism slides to generate jamming due to welding deformation is effectively avoided, and the manufacturing precision of the tool is improved.
The measuring pawl is provided with a return spring so as to ensure that the measuring pawl can be tightly attached to the surface of a corresponding measuring workpiece during measurement, and the measuring precision and effectiveness are improved. The return springs are all positioned by means of positioning screws mounted on the measuring tool body 23. When the spring is prevented from being stressed, the spring moves in the height axis direction, the measurement precision is improved, and the measurement deviation is avoided.
As shown in fig. 5, the digital display measuring instruments include a first digital display measuring instrument 17, a second digital display measuring instrument 18, and a third digital display measuring instrument 19.
The first digital display measuring instrument 17 is positioned in the 12 o' clock direction of the measuring tool body 23 and is positioned at the upper part of the measuring tool body 23; the third digital display measuring instrument 19 is positioned in the 9 o' clock direction of the measuring tool body 23 and is positioned in the middle of the measuring tool body 23; the second digital measuring instrument 18 is located at 3 o' clock of the measuring tool body 23 and is located at a lower portion of the measuring tool body 23. Limited to the diameter and length limitations of the measuring tool body 23 shaft, three gauges, sliding sleeves, and dowel pins must be spatially separated.
As shown in fig. 5, the measuring clicks include an upper measuring click 20, a middle measuring click 21, and a lower measuring click 22. The measuring clicks comprise an arrangement of an upper measuring click 20, a middle measuring click 21 and a lower measuring click 22, as shown in fig. 7-9. The lower measuring pawl 22 has a length of 50mm and a width of 10 mm. The length of the middle measuring pawl 21 is 47.5mm, the width of the middle measuring pawl is 10mm, the length of the upper measuring pawl 20 is 150mm, the width of the upper measuring pawl is 10mm, the length and the width of the matching surface of the measuring pawl are matched with the sizes of the corresponding matching surface, and the stable structure and no inclination are ensured during matching.
The lower measuring pawl 22 is located at the 3 o' clock direction of the measuring tool body 23 and at the lower part of the measuring tool body 23; the upper measuring pawl 20 is located at 9 o' clock direction of the measuring tool body 23 and in the middle of the measuring tool body 23; the middle measuring pawl 21 is positioned in the 3 o' clock direction of the measuring tool body 23 and is positioned at the middle lower part of the measuring tool body 23, the spatial arrangement height of the middle measuring pawl is matched with the installation and running positions of the protective pipe assembly in the pressure container, such as the height shown in figures 2-3, and a space for the pawl to slide up and down is reserved, so that the connecting sleeve can drive the instrument to move up and down, and the display of measured data is realized.
The sliding sleeve 24 of the third digital display measuring instrument 19 is fixedly connected with the connecting sleeve on the upper measuring pawl 20 through a positioning pin 25, the sliding sleeve 24 of the second digital display measuring instrument 18 is fixedly connected with the connecting sleeve on the middle measuring pawl 21 through the positioning pin 25, and the sliding sleeve 24 of the first digital display measuring instrument 17 is fixedly connected with the connecting sleeve on the lower measuring pawl 22 through the positioning pin 25. So that the third digital display measuring instrument 19 moves together with the upper measuring pawl 20, the second digital display measuring instrument 18 moves together with the middle measuring pawl 21, and the first digital display measuring instrument 17 moves together with the lower measuring pawl 22.
The measuring handle 16 is connected to the lower measuring pawl 22 by a central rod assembly spindle of the measuring tool body 23. The measuring handle 16 is located on the top of the measuring tool body 23, the top of the measuring tool body 23 is provided with a sliding groove, and the measuring handle 16 rotates circumferentially in the sliding groove, as shown in fig. 10-11.
The lower measuring pawl 22 is a rotatable structure, a sliding groove is formed in the bottom of the measuring tool body 23, the side face of the lower measuring pawl 22 is matched with the groove in the measuring tool body 23, and the lower measuring pawl 22 rotates circumferentially in the sliding groove to realize rotation at a certain angle, as shown in fig. 12-13. The measuring handle 16 is connected to the lower measuring pawl 22 for integral rotation.
The slide caliper body is rectangular form, and there is the trompil both ends, and the screw is installed to the trompil position, installs slide caliper detachably on measuring tool body 23 through the screw. The meter head of the digital display measuring instrument slides up and down along the long-strip-shaped track of the vernier caliper, and the reading on the digital display measuring instrument changes continuously.
The checking platform provides zeroing and checking functions for the protection tube assembly measuring tool. As shown in fig. 4, the verification platform comprises a first measuring step 13, a second measuring step 14 and a third measuring step 15. The first measuring step 13 is located at the topmost part of the checking platform and is away from the third measuring step by 15115 mm, the second measuring step 14 is located at the middle part and is away from the third measuring step by 1575 mm, and the third measuring step 15 is located at the bottom and is away from the bottom plane of the checking platform by 15 mm.
The height of the structure of the checking platform is calculated carefully, the height of the first measuring step 13 is 115mm, the height of the second measuring step 14 is 40mm, and the height of the third measuring step 15 is 15 mm. During checking, the three measuring pawls of the measuring tool of the protective pipe assembly are respectively matched with the three measuring steps. During verification, the upper measuring pawl 20 is tightly attached to the surface of the first measuring step 13, the middle measuring pawl 21 is tightly matched with the surface of the second measuring step 14, and the lower measuring pawl 22 is tightly matched with the surface of the third measuring step 15. Therefore, the digital display measuring instrument is not reset to zero in the traditional sense when being reset to zero, but the digital display measuring instrument is set on the checking platform as follows: the first digital display measuring instrument 17 is set to "+ 15.00 mm", the second digital display measuring instrument 18 is set to "+ 115.00 mm", and the third digital display measuring instrument 19 is set to "+ 40.00 mm". The symbols of "+" and "-" are related to the up-down installation direction of the instrument, and can be adjusted on the instrument, thereby facilitating reading.
The measuring method of the position measuring tool for the reactor protection tube component of the nuclear power station, which is provided by the invention, comprises the following steps:
Whether the electric quantity of the button cell on the detection protection tube assembly position measuring tool is sufficient or not is checked, and if the electric quantity of the button cell does not meet the use requirement, the button cell is replaced by a new button cell.
Preparing a plurality of metal sheets with standard thickness or non-deformable sheets, and requiring that the thickness of each metal sheet or sheet made of other materials is uniform so as to simulate the height change of the surfaces of the three measuring steps, namely the first measuring step 13, the second measuring step 14 and the third measuring step 15, on the checking platform.
Setting parameters of a measuring instrument: the first digital display measuring instrument 17, the second digital display measuring instrument 18 and the third digital display measuring instrument 19 are turned ON (ON/OFF buttons are pressed), the unit of the measuring instrument is adjusted to a mm state through a mm/in button ON each digital display measuring instrument, and at the moment, mm information can be displayed ON an electronic screen of the measuring instrument. When a HOLD identification appears on the electronic screen, HOLD display information can be cancelled by pressing a HOLD button on the measuring instrument.
The protection tube assembly measuring tool is placed on a calibration platform, the handle 16 is lifted before the protection tube assembly measuring tool is placed on the calibration platform, then the handle 16 is rotated clockwise (seen from the upper surface of the tool), the lower measuring pawl 22 assembly is rotated to the position of entering the platform, the tool body 23 to be measured enters the measuring platform and is lowered to the 115mm step 13, the handle 16 is rotated anticlockwise, and the lower measuring pawl 22 is screwed into the platform installation position. The resetting of the measuring instrument and the setting of other numerical values can be realized by pressing the SET button on the measuring instrument for multiple times. The "+" and "-" in front of the numbers represent the increasing and decreasing directions of the measured values. In order to realize the matching with the verification platform and simultaneously ensure the quick reading on the overhaul site, the integral value of the measuring instrument is set as follows: the first digital display measuring instrument 17 is set to "15.00 mm", the second digital display measuring instrument 18 is set to "115.00 mm", and the third digital display measuring instrument 19 is set to "+ 40.00 mm".
Checking the matching condition of the centers of the upper measuring pawl 20, the middle measuring pawl 21 and the lower measuring pawl 22 and the surfaces of the measuring steps on the checking platform, requiring tight fitting, observing whether the reading is abnormal or not, and resetting the parameters of the digital display measuring instrument when necessary. And taking the protective tube assembly measuring tool away from the verification platform.
Prepared metal sheets or non-deformable sheets with standard thickness are respectively placed on the surfaces of the measuring steps on the checking platform, and the metal sheets or the sheets with different thicknesses can be respectively placed on the measuring steps by an operator according to needs. The measuring tool is then placed on the checking platform again, without the need for a re-zeroing operation, by simply mating each measuring jaw with the surface of each measuring step and, if desired, mating the surface of the lower measuring jaw 22 with the lower surface of the second measuring step 14 by means of the handle 16. Note that: at the moment, the gauge heads of the 3 measuring instruments need to be lightly pressed, and meanwhile, each measuring claw needs to be lightly pressed in place, so that data measurement errors are easily caused by excessive pressing.
And recording the readings of the first digital display measuring instrument 17, the second digital display measuring instrument 18 and the third digital display measuring instrument 19. And the accuracy of the measuring tool is checked by combining the numerical value of a metal sheet with known thickness or a thin sheet which is not easy to deform and made of other materials newly added on the checking platform. And then taking down the measuring tool again, placing metal sheets or thin sheets with changed thicknesses on the surfaces of the measuring steps, repeatedly verifying and debugging the tool, and repeating for 3-5 times. Through the checking and debugging, the accuracy and the reliability of the measurement of the tool can be verified, and the training of operators can be synchronously realized.
Step 2, protecting the pipe assembly measuring tool for field operation
And (3) checking the measuring tool according to the step 1 before the beginning of formal measuring work, checking whether the protective pipe assembly measuring tool has parts which are easy to fall off or not, and making a foreign matter prevention measure.
And transporting the measuring tool and the checking platform to the vicinity of the main junction surface of the reactor pressure vessel by using the homemade small article transport container. In the process, the measuring handle and each measuring pawl of the measuring tool are kept from collision, damage and deformation.
The calibration platform is placed on the main sealing surface of the reactor pressure vessel, and the calibration platform is prevented from damaging the main sealing surface by paying attention to light placement.
Before use, the measuring tool is placed on a checking platform for checking, and after checking is finished, the measuring operation is executed.
And (4) placing the measuring tool on the corresponding measuring position of the protective pipe assembly, and reading and recording the reading of each measuring instrument.
In order to ensure the accuracy of measurement result data, the calibration platform is used for calibrating the measuring tool once when one measuring axis is replaced according to the axis of the protective tube component, and the measurement of the next position can be continued after the calibration.
After the measurement work is finished, the tool is transported to a storehouse carefully, and the power supply of the 3 digital display measuring instruments on the measuring tool is turned off and then contained in a special storage box. During transportation and storage, the measuring handle and the 3 measuring pawls are strictly prohibited to be in a pressed state so as not to deform.
The position measuring tool for the nuclear power station reactor protection tube assembly effectively solves the problems of interference, large measuring error and long measuring time existing between the lengths of the pawl and the cantilever of the traditional tool and the field space.
When the position measuring tool for the protection tube assembly of the nuclear power station reactor is used for measurement, the required gamma value can be directly read out, the measuring time is effectively shortened, the time that maintenance personnel stay in a high-temperature environment for a long time is reduced, the physical consumption of the maintenance personnel is reduced, the working efficiency is improved, the measured value is more accurate, the effectiveness of measured data is improved, and a reliable basis is provided for the subsequent execution of the position change analysis of the protection tube assembly in the pressure container.
The measuring tool can be popularized and applied to related measuring work of units of the same type, and can also be used for measuring other similar equipment of a power station. The measuring tool of the invention has good reference significance for the measuring work of other similar devices in the same industry.
The present invention has been described in detail with reference to the drawings and examples, but the present invention is not limited to the examples, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present invention. The prior art can be adopted in the content which is not described in detail in the invention.
Claims (13)
1. A nuclear power plant reactor protection tube assembly position measurement tool, the measurement tool comprising: measuring tool body (23), measure pawl, digital display measuring apparatu and slide caliper, slide caliper fix on measuring tool body (23), have seted up the spout on measuring tool body (23) with the intermediate position that slide caliper position corresponds, digital display measuring instrument installs in the spout of measuring tool body (23), measure pawl slidable mounting on measuring tool body (23), digital display measuring instrument corresponds with the measurement pawl and is connected.
2. The nuclear power plant reactor protection tube assembly position measuring tool of claim 1, further comprising a sliding sleeve (24), wherein the digital display measuring instrument is fixed on the sliding sleeve (24), two positioning pins (25) are installed on the sliding sleeve (24), the sliding sleeve (24) is installed in a sliding groove of the measuring tool body (23) through the positioning pins (25), and the digital display measuring instrument is installed in the sliding groove of the measuring tool body (23) through the sliding sleeve (24).
3. The nuclear power plant reactor protection tube assembly position measuring tool of claim 2, wherein the measuring pawl is connected with a connecting sleeve, and a positioning pin (25) on the sliding sleeve (24) is fixedly connected with the connecting sleeve on the measuring pawl.
4. The tool of claim 3, wherein the measuring pawl is connected to the connection sleeve by welding.
5. The nuclear power plant reactor protection tube assembly position measuring tool of claim 4, wherein the measuring pawl is provided with a return spring, and the return spring is positioned by a positioning screw mounted on the measuring tool body (23).
6. The nuclear power plant reactor protection tube assembly position measuring tool of claim 5, wherein the digital display measuring instrument comprises a first digital display measuring instrument (17), a second digital display measuring instrument (18) and a third digital display measuring instrument (19), and the first digital display measuring instrument (17) is positioned at 12 o' clock direction of the measuring tool body (23) and is positioned at the upper part of the measuring tool body (23); the third digital display measuring instrument (19) is positioned in the 9 o' clock direction of the measuring tool body (23) and is positioned in the middle of the measuring tool body (23); the second digital display measuring instrument (18) is positioned in the 3 o' clock direction of the measuring tool body (23) and is positioned at the lower part of the measuring tool body (23).
7. The nuclear power plant reactor protection tube assembly position measuring tool of claim 6, wherein the measuring pawl comprises an upper measuring pawl (20), a middle measuring pawl (21) and a lower measuring pawl (22), the lower measuring pawl (22) is located at 3 o' clock direction of the measuring tool body (23) and is located at the lower part of the measuring tool body (23); the upper measuring pawl (20) is positioned in the 9 o' clock direction of the measuring tool body (23) and is positioned in the middle of the measuring tool body (23); the middle measuring pawl (21) is positioned in the 3 o' clock direction of the measuring tool body (23) and is positioned at the middle lower part of the measuring tool body (23).
8. The nuclear power plant reactor protection tube assembly position measuring tool of claim 7, wherein the sliding sleeve (24) of the third digital display measuring instrument (19) is fixedly connected with the connecting sleeve on the upper measuring pawl (20) through a positioning pin (25), the sliding sleeve (24) of the second digital display measuring instrument (18) is fixedly connected with the connecting sleeve on the middle measuring pawl (21) through the positioning pin (25), and the sliding sleeve (24) of the first digital display measuring instrument (17) is fixedly connected with the connecting sleeve on the lower measuring pawl (22) through the positioning pin (25).
9. The nuclear power plant reactor protection tube assembly position measuring tool of claim 8, wherein the lower measuring pawl (22) is a rotatable structure, and the lower measuring pawl (22) rotates in a circumferential direction in a sliding groove formed at the bottom of the measuring tool body (23).
10. The nuclear power plant reactor protection tube assembly position measuring tool of claim 9, further comprising a measuring handle (16), wherein the measuring handle (16) is located at the top of the measuring tool body (23), the measuring handle (16) rotates in a circumferential direction in a sliding groove formed at the top of the measuring tool body (23), and the measuring handle (16) is connected with the lower measuring pawl (22).
11. The nuclear power plant reactor protection tube assembly position measuring tool of claim 10, wherein the vernier caliper is detachably mounted on a measuring tool body (23).
12. The nuclear power plant reactor protection tube assembly position measuring tool of claim 11, further comprising a verification platform, the verification platform comprising a first measuring step (13), a second measuring step (14), and a third measuring step (15), the first measuring step (13) being located at a topmost portion of the verification platform, the second measuring step (14) being located at a middle portion of the verification platform, and the third measuring step (15) being located at a bottom portion of the verification platform.
13. The nuclear power plant reactor protection tube assembly position measuring tool of claim 12, wherein the height of the first measuring step (13) is 115mm, the height of the second measuring step (14) is 40mm, and the height of the third measuring step (15) is 15 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111655621.XA CN114353617A (en) | 2021-12-31 | 2021-12-31 | Nuclear power station reactor protection tube assembly position measuring tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111655621.XA CN114353617A (en) | 2021-12-31 | 2021-12-31 | Nuclear power station reactor protection tube assembly position measuring tool |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114353617A true CN114353617A (en) | 2022-04-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111655621.XA Pending CN114353617A (en) | 2021-12-31 | 2021-12-31 | Nuclear power station reactor protection tube assembly position measuring tool |
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| Country | Link |
|---|---|
| CN (1) | CN114353617A (en) |
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2021
- 2021-12-31 CN CN202111655621.XA patent/CN114353617A/en active Pending
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