CN107014538B - Device for measuring pressing force of plate spring of fuel assembly - Google Patents
Device for measuring pressing force of plate spring of fuel assembly Download PDFInfo
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- CN107014538B CN107014538B CN201710395739.0A CN201710395739A CN107014538B CN 107014538 B CN107014538 B CN 107014538B CN 201710395739 A CN201710395739 A CN 201710395739A CN 107014538 B CN107014538 B CN 107014538B
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- outer tube
- fuel assembly
- measuring
- pressing force
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
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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
Abstract
The invention discloses a device for measuring the pressing force of a plate spring of a fuel assembly, which comprises an outer tube, an upper supporting mechanism, a driving mechanism, a core rod and a pressing force measuring mechanism, wherein the outer tube is of a hollow structure; the upper supporting mechanism comprises a supporting seat and a hanging bracket, the driving mechanism is arranged on the supporting seat, the driving mechanism drives the outer tube to rotate, the core bar is connected with the handle, the compaction force measuring mechanism comprises a screw rod, a screw rod nut, a mounting plate, a locating pin, a pressing plate, a clamping plate, a pressure sensor and a display, the screw rod is in butt joint connection with the outer tube, the screw rod nut is arranged on the mounting plate, the screw rod passes through the screw rod nut, the locating pin is elastically connected onto the mounting plate and passes through the pressing plate, the core bar passes through the pressing plate after passing through the outer tube and is in detachable connection with the clamping plate, the shaft sleeve is arranged on the core bar to block the pressing plate from vertically sliding downwards, the pressure sensor is arranged on the mounting plate and is electrically connected with the display, and in the measuring process, the plate spring is clamped between the clamping plate and the pressing plate, so that no external force interference exists, and the measurement is accurate and reliable, simple in structure and practical.
Description
Technical Field
The present invention relates to a measuring tool for a fuel assembly, and more particularly to a measuring device for measuring the pressing force of a leaf spring in an upper stem of a fuel assembly.
Background
The spring pressure tester adopts a double-space floor type structure, wherein the upper space is stretched, and the lower space is compressed and bent. The main machine part comprises a floor type frame formed by four upright posts, an upper cross beam, a middle cross beam and a workbench, the speed regulating system is arranged at the lower part of the workbench, the alternating current servo motor drives the ball screw to rotate through the synchronous toothed belt speed reducing system, the ball screw drives the middle cross beam to drive the stretching attachment to move up and down, and loading and unloading of a sample are realized; the spring pressure testing machine with the structure is complex in structure, cannot work under water, and cannot be applied to the measurement of the pressing force (namely, the elastic force) of the plate spring of the upper tube seat of the fuel assembly in the spent fuel pool.
Accordingly, there is a need for a measuring device for measuring the pressing force of a leaf spring in an upper tube socket of a fuel assembly that is simple in construction and operable on water.
Disclosure of Invention
The invention aims to provide a fuel assembly leaf spring pressing force measuring device for measuring pressing force of a leaf spring in an upper tube seat of a fuel assembly, which is simple in structure and can be operated on a spent fuel pool only.
In order to achieve the above object, the present invention provides a device for measuring a pressing force of a leaf spring of a fuel assembly, for measuring a pressing force of a leaf spring in an upper tube seat of the fuel assembly, wherein the device for measuring a pressing force of a leaf spring of a fuel assembly comprises an outer tube, an upper supporting mechanism, a driving mechanism, a core bar and a pressing force measuring mechanism, and the outer tube has a hollow structure; the upper supporting mechanism comprises a supporting seat and a hanging bracket, and the hanging bracket is arranged on the supporting seat; the driving mechanism is arranged on the supporting seat, the upper end of the outer tube is connected with the driving mechanism, and the driving mechanism drives the outer tube to rotate; the core rod is arranged in the outer tube, the upper end of the core rod is connected with a handle, the handle is pivoted on the supporting seat, and the handle is locked with the supporting seat after rotating for a certain angle; the pressing force measuring mechanism comprises a screw rod, a screw rod nut, a mounting plate, a locating pin, a pressing plate, a clamping plate, a pressure sensor and a display, wherein the upper end of the screw rod is in butt joint with the lower end of the outer tube, the screw rod nut is arranged on the mounting plate, the lower end of the screw rod penetrates through the screw rod nut in a meshed mode, the upper end of the locating pin is elastically connected to the mounting plate, the lower end of the locating pin penetrates through the pressing plate in a movable mode, the locating pin is vertically arranged, the pressing plate is located under the mounting plate and is parallel to the pressing plate, the lower end of the core rod penetrates through the outer tube and then penetrates through the pressing plate and is in detachable connection with the clamping plate, the clamping plate is in a cross structure, the upper portion of the core rod is provided with a shaft sleeve which is used for blocking the pressing plate to vertically slide downwards, the shaft sleeve is located at a certain distance from the clamping plate, the clamping plate is located under the pressing plate and is mutually parallel to the pressing plate, the pressure sensor is arranged on the upper portion of the pressing plate and faces the pressing plate, and the display is electrically connected with the mounting plate.
Preferably, the device for measuring the pressing force of the leaf spring of the fuel assembly further comprises a thrust ball bearing, wherein the thrust ball bearing is arranged between the outer tube and the screw rod, and the outer tube is in butt joint connection with the screw rod through the thrust ball bearing.
Preferably, the core rod is further provided with a clamping protrusion corresponding to the thrust ball bearing, the clamping protrusion is arranged below the thrust ball bearing, and when the core rod moves vertically upwards, the clamping protrusion is abutted to the thrust ball bearing.
Preferably, the driving mechanism comprises a servo motor and a conical gear set, the servo motor is horizontally arranged on the supporting seat, an output shaft of the servo motor is connected with an input end of the conical gear set, an output end of the conical gear set is connected with an upper end of the outer tube, and the outer tube is driven to rotate in the vertical direction by the aid of the conical gear set due to horizontal rotation of the servo motor.
Preferably, the hanging bracket is in a pi-shaped structure.
Preferably, two clamping protrusions are arranged on the horizontal part of the hanging bracket, and a limiting groove is formed between the two clamping protrusions.
Preferably, the device for measuring the pressing force of the plate spring of the fuel assembly further comprises a pin sleeve, wherein the pin sleeve is vertically arranged on the mounting plate, and the upper end of the positioning pin is elastically and slidably clamped in the pin sleeve.
Preferably, a spiral spring is arranged in the pin sleeve, the spiral spring is sleeved outside the upper end of the positioning pin, and the spiral spring is propped between the positioning pin and the pin sleeve.
Preferably, the clamping plate and the core bar are detachably connected through mutually meshed threads.
Compared with the prior art, when the device for measuring the pressing force of the leaf spring of the fuel assembly in the upper tube seat of the fuel assembly in the spent fuel pool is required to measure the pressing force of the leaf spring of the fuel assembly in the spent fuel pool, the crane is hung on the hanging frame of the upper supporting mechanism, so that the device for measuring the pressing force of the leaf spring of the fuel assembly in the fuel assembly is hung and moved to the position right above the fuel assembly in the spent fuel pool, the crane is controlled to slowly descend, the lower end of the positioning pin is inserted into the guide hole of the upper tube seat, the pressing plate is supported on the leaf spring of the upper tube seat, the clamping plate of the cross structure passes through the through hole of the upper tube seat of the fuel assembly, after the clamping plate passes through the through hole of the upper tube seat, the handle is stopped to descend and turned to a locking state, the handle is turned through the core bar to drive the clamping plate to rotate to the position below the framework of the upper tube seat (namely, the position right above the clamping plate is not the through hole anymore), then a driving mechanism is started, the driving mechanism drives the outer tube to rotate, the rotation of the outer tube drives the screw rod to rotate in the vertical direction, the mounting plate and the pressing plate are under the limiting and positioning action of the positioning pin, the screw rod rotates in the vertical direction to enable the mounting plate provided with the screw rod nut to vertically move downwards along the screw rod (namely move towards the clamping plate), the vertical downwards movement of the mounting plate enables the pressure sensor to be in contact with the pressing plate, at the moment, the plate spring of the upper tube seat is pressed under the pressing plate, the pressure sensor can accurately acquire the pressing force born by the plate spring through contact with the pressing plate, the pressing force can read data in real time through a display electrically connected with the pressure sensor and arranged outside the spent fuel pool, in the pressing force measurement process of the plate spring, the upper tube seat is supported by the clamping plate, and the pressing plate is directly pressed on the plate spring in the measurement process, the plate spring is clamped between the clamping plate and the pressing plate, no interference of any other external force exists, the measurement is accurate and reliable, meanwhile, the pressing plate applies pressure to the plate spring due to the supporting of the clamping plate on the upper tube seat, and finally the clamping plate is supported by the clamping plate, the pressure applied by the clamping plate is transmitted to the device for measuring the pressing force of the plate spring of the fuel assembly under the action of the core rod, so that the upper tube seat is not subjected to the pressure applied by the device for measuring the pressing force of the plate spring in the process of measuring the pressing force of the plate spring, the upper tube seat and the fuel assembly are not damaged in the process of measuring the pressing force of the plate spring, and the safety of the fuel assembly is ensured. Therefore, the device for measuring the pressing force of the plate spring of the fuel assembly is simple in structure, the upper tube seat and the fuel assembly cannot be damaged in the pressing force measuring process of the plate spring, meanwhile, the device can be operated on a spent fuel pool, and the device is accurate, simple and convenient in measurement and high in practicability.
Drawings
Fig. 1 is a schematic view of the structure of the device for measuring the pressing force of the leaf spring of the fuel assembly of the present invention.
FIG. 2 is a schematic view of the connection structure of the outer tube, upper support structure and drive mechanism of the present invention.
FIG. 3 is a schematic diagram of the connection structure of the core rod and the pressing force measuring mechanism of the present invention.
Fig. 4 is a schematic cross-sectional view of fig. 3.
Detailed Description
Embodiments of the present invention will now be described with reference to the drawings, wherein like reference numerals represent like elements throughout.
As shown in fig. 1 to 4, the device 100 for measuring the pressing force of the leaf spring of the fuel assembly of the present invention is used for measuring the pressing force of the leaf spring in the upper tube seat of the fuel assembly, the device 100 for measuring the pressing force of the leaf spring of the fuel assembly comprises an outer tube 1, an upper supporting mechanism 2, a driving mechanism 3, a core bar 4, a handle 5 and a pressing force measuring mechanism 6, wherein the outer tube 1 is in a hollow structure, so that the outer tube of the present invention is in a tubular structure; the upper supporting mechanism 2 comprises a supporting seat 21 and a hanging bracket 22, wherein the hanging bracket 22 is arranged on the supporting seat 21, and the hanging bracket 22 is used for hanging a hook of a crane so as to hang and move the invention; the driving mechanism 3 is arranged on the supporting seat 21, the upper end of the outer tube 1 is connected with the driving mechanism 3, and the driving mechanism 3 drives the outer tube 1 to rotate; the core rod 4 is arranged in the outer tube 1, the rotation of the outer tube 1 does not drive the core rod 4 to rotate, the vertical movement of the core rod 4 does not drive the outer tube 1 to move, the core rod 4 and the handle 5 move independently of each other, the upper end of the core rod 4 is connected with the handle 5, the handle 5 is pivoted on the supporting seat 21, the handle 5 is locked with the supporting seat 21 after rotating for a certain angle, in particular, the handle 5 is locked with the supporting seat 21 after rotating for 45 degrees, a return spring is arranged on a transmission rod of the handle, and the handle 5 is locked on the supporting seat 21 by the return spring after rotating for 45 degrees; the compaction force measuring mechanism comprises a screw rod 61, a screw rod nut 62, a mounting plate 63, a locating pin 64, a pressing plate 65, a clamping plate 66, a shaft sleeve 67, a pressure sensor 68 and a display, wherein the upper end of the screw rod 61 is in butt joint with the lower end of the outer tube 1, the screw rod nut 62 is arranged on the mounting plate 63, the lower end of the screw rod 61 passes through the screw rod nut 62 in a meshed mode, the upper end of the locating pin 64 is elastically connected to the mounting plate 63, the lower end of the locating pin 64 passes through the pressing plate 65 in a movable mode, the locating pin 64 is vertically arranged, the pressing plate 65 is located under the mounting plate 63 and is parallel to each other, the lower end of the core rod 4 passes through the outer tube 1 and then passes through the pressing plate 65 and is in detachable connection with the clamping plate 66, the clamping plate 66 is in a cross structure, the clamping plate can smoothly penetrate into a lower tube seat and rotate for a certain angle, then is overlapped with a framework of the lower tube seat, the clamping plate 65 is vertically arranged under the pressing plate 65, the shaft sleeve 67 is located under the pressing plate 65, the shaft sleeve 67 is a certain distance from the clamping plate 66, the lower sliding of the pressing plate 65 is blocked by the shaft sleeve 67, a space formed between the pressing plate 65 and the clamping plate 65 is enabled to be in a sliding mode, the space for clamping the upper side of the pressing plate 65 and the clamping plate 65 is located under the pressure sensor 68 and is not parallel to the pressure sensor 68, and is arranged on the upper side of the clamping plate 68, and is electrically connected to the upper plate 68 (and is shown) and is arranged in the upper side parallel to the upper plate 68. When the pressing force of the leaf spring in the upper tube seat of the fuel assembly in the spent fuel pool needs to be measured, a crane hook is hung on the hanging frame 22 of the upper supporting mechanism 2, so that the fuel assembly leaf spring pressing force measuring device 100 of the invention is lifted up and moved to the position right above the fuel assembly in the spent fuel pool, the crane is controlled, the invention is slowly lowered, the lower end of the positioning pin 64 is inserted into the guide hole of the upper tube seat, the pressing plate 65 is supported on the leaf spring of the upper tube seat, the clamping plate 66 of the cross structure passes through the through hole of the upper tube seat of the fuel assembly, after the clamping plate passes through the through hole of the upper tube seat, the handle 5 is stopped to be lowered and rotated to a locking state, the rotation of the handle 5 drives the clamping plate 66 to rotate to the position right below the frame of the upper tube seat (namely, the upper part of the clamping plate is not the through hole anymore) through the core bar 4, then the driving mechanism is started, the driving mechanism drives the outer tube 1 to rotate, the rotation of the outer tube 1 drives the screw rod 61 to rotate in the vertical direction, the mounting plate 63 and the pressing plate 65 are under the limiting and positioning action of the positioning pin 64, the screw rod 61 rotates in the vertical direction to enable the mounting plate 63 provided with the screw rod nut 62 to vertically move downwards along the screw rod 61 (namely move towards the clamping plate direction), the vertical downwards movement of the mounting plate 63 enables the pressure sensor 68 to abut against the pressing plate 65, at the moment, the plate spring of the upper tube seat is pressed under the pressing plate 65, the pressing force applied to the plate spring can be accurately obtained by the pressure sensor 68 through abutting against the pressing force of the pressing plate 65, the data can be read in real time through a display which is electrically connected with the pressure sensor 68 and is arranged outside the spent fuel pool, in the pressing force measurement process of the plate spring, the upper tube seat is supported by being borne by the clamping plate 66, and the pressing plate 65 is directly abutted against the plate spring, therefore, in the measuring process, the plate spring is clamped between the clamping plate 66 and the pressing plate 65, no interference of any other external force exists, the measurement is accurate and reliable, meanwhile, due to the support of the clamping plate 66 on the upper tube seat, the pressure exerted by the pressing plate 66 on the plate spring is finally supported by the clamping plate 66, the pressure exerted by the clamping plate 66 is transmitted to the device 100 for measuring the pressing force of the plate spring of the fuel assembly provided by the invention under the action of the core rod 4, and therefore, the upper tube seat is not subjected to the pressure exerted by the invention in the measuring process of the pressing force of the plate spring, and the upper tube seat and the fuel assembly are not damaged in the measuring process of the pressing force of the plate spring, so that the safety of the fuel assembly is ensured. Therefore, the device for measuring the pressing force of the plate spring of the fuel assembly is simple in structure, the upper tube seat and the fuel assembly cannot be damaged in the pressing force measuring process of the plate spring, meanwhile, the device can be operated on a spent fuel pool, and the device is accurate, simple and convenient in measurement and high in practicability. The fuel assembly leaf spring hold-down force measurement device 100 of the present invention is described in further detail below with respect to FIGS. 1-4:
as shown in fig. 1-4, the device for measuring the pressing force of the leaf spring of the fuel assembly according to the present invention further comprises a thrust ball bearing 69, wherein the thrust ball bearing 69 is arranged between the outer tube 1 and the screw rod 61, and the outer tube 1 and the screw rod 61 are in butt joint connection through the thrust ball bearing 69; specifically, the core rod 4 is further provided with a clamping protrusion 41 corresponding to the thrust ball bearing 69, the clamping protrusion 41 is arranged below the thrust ball bearing 69, and when the core rod 4 moves vertically upwards, the clamping protrusion 41 is abutted against the thrust ball bearing 69; when the leaf spring of the upper tube seat is supported by the clamping plate 65, the upper tube seat is supported by the clamping plate 66, so that the clamping plate 66 provides a vertical upward supporting force to support the upper tube seat to give downward pressure, in the process of measuring the pressing force of the leaf spring, the clamping protrusion on the core rod 4 is positioned below the thrust ball bearing 69, so that the vertical upward supporting force received by the core rod 4 is transmitted to the matching structure of the screw rod 61 and the screw rod nut 62 by the interference of the clamping protrusion and the thrust ball bearing, and therefore, the upper tube seat is not subjected to the pressure given by the invention in the process of measuring the pressing force of the leaf spring, and the pressure applied by the invention and the gravity of the upper tube seat are mostly borne by the screw rod 61 and the screw rod nut 62, so that the upper tube seat and the fuel assembly are not damaged in the process of measuring the pressing force of the leaf spring, and the safety of the fuel assembly is ensured.
As shown in fig. 1-4, preferably, the driving mechanism comprises a servo motor and a conical gear set, the servo motor 31 is horizontally arranged on the supporting seat 21, an output shaft of the servo motor 31 is connected with an input end of the conical gear set 32, an output end of the conical gear set 32 is connected with an upper end of the outer tube 1, and the horizontal rotation of the servo motor 31 drives the outer tube 1 to rotate in a vertical direction through the conical gear set 32; by the cooperation of the servo motor 31 and the bevel gear set 32, the change of the rotation speed and the rotation direction of the servo motor 31 is realized by the bevel gear set 32, and the structure is simple and practical. It should be noted that the servo motor 31 and the bevel gear set 32 of the present invention are conventional.
As shown in fig. 1-4, preferably, the hanging frame 22 of the upper supporting mechanism 2 of the invention is in a pi-shaped structure, and the hanging frame 22 in the pi-shaped structure is more convenient for the crane to lift the invention; specifically, two clamping protrusions 221 are arranged on the horizontal part of the hanger 11, and a limiting groove 222 is formed between the two clamping protrusions 221; when the crane is lifted, the hook is directly hooked in the limiting groove 222, and the stability of the crane for lifting is further improved by limiting the hook through the limiting groove 222.
As shown in fig. 1-4, the device 100 for measuring the pressing force of the leaf spring of the fuel assembly further comprises a pin sleeve 64a, wherein the pin sleeve 64a is vertically arranged on the mounting plate 63, and the upper end of the positioning pin 64 is elastically and slidably clamped in the pin sleeve 64 a; since the positioning pin 64 is elastically and slidably clamped in the pin sleeve 64a, when the lower end of the positioning pin 64 collides with a component in the upper tube seat in the lifting and descending process of the crane, the positioning pin 64 can adaptively slide in the pin sleeve 64a, so that the mounting plate 63 can continuously descend.
As shown in fig. 4, preferably, a coil spring 64b is disposed in the pin sleeve 64a, the coil spring 64b is sleeved outside the upper end of the positioning pin 64, and the coil spring 64b is pressed between the positioning pin 64 and the pin sleeve 64 a; the positioning pin 64 is elastically arranged in the pin sleeve 64a by the spiral spring 64b, so that the material is conveniently obtained, and the structure is simple and practical.
As shown in FIG. 4, the clip 66 is preferably removably connected to the stem 4 by interengaging threads; specifically, the screw hole is formed in the center of the clamping plate 66, the lower end of the core bar 4 is of a screw structure, the clamping plate 66 and the core bar 4 are detachably connected through the engagement of the screw structure and the screw hole, and the structure is simple and practical.
As shown in fig. 1 to 4, when the pressing force of the leaf spring in the upper tube seat of the fuel assembly in the spent fuel pool needs to be measured, the crane hook is hung on the hanging bracket 22 of the upper supporting mechanism 2, so that the fuel assembly leaf spring pressing force measuring device 100 of the invention is lifted up and moved to the position right above the fuel assembly in the spent fuel pool, the crane is controlled to slowly descend, the lower end of the positioning pin 64 is inserted into the guide hole of the upper tube seat, the pressing plate 65 is supported on the leaf spring of the upper tube seat, the clamping plate 66 of the cross structure passes through the through hole of the upper tube seat of the fuel assembly, after the clamping plate 66 passes through the through hole of the upper tube seat, the handle 5 is stopped to descend and rotate to a locking state, the rotation of the handle 5 drives the clamping plate 66 to rotate to the position right below the framework of the upper tube seat (namely, the upper side of the clamping plate is no longer the through hole) through the core bar 4, then, the servo motor 31 is started, the servo motor 31 drives the outer tube 1 to rotate through the conical gear set 32, the rotation of the outer tube 1 drives the screw rod 61 to rotate in the vertical direction, the mounting plate 63 and the pressing plate 65 enable the screw rod 61 to vertically rotate under the limiting and positioning action of the positioning pin 64, the mounting plate 63 provided with the screw rod nut 62 vertically moves downwards along the screw rod 61 (namely moves towards the clamping plate), the mounting plate 63 vertically moves downwards to enable the pressure sensor 68 to abut against the pressing plate 65, at the moment, the plate spring of the upper tube seat is pressed under the pressing plate 65, the pressing force applied to the plate spring can be accurately obtained through the pressing force of the pressing sensor 68, and data can be read in real time through a display which is electrically connected with the pressure sensor 68 and arranged outside the spent fuel pool; after the plate spring of the upper tube seat is measured, the private clothes motor 31 is started, so that the servo motor 31 is opposite to the rotating direction during measurement, the mounting plate 63 provided with the screw nut 62 vertically moves upwards along the screw 61, the pressure sensor 68 arranged on the mounting plate 63 is separated from the interference with the plate spring, then the handle 5 is rotated to an initial position (namely a position before measurement), so that the clamping plate 66 is rotated right below the through hole of the upper tube seat again, at the moment, the invention is lifted by the crane, the clamping plate penetrates out of the through hole of the upper tube seat and is separated from the upper tube seat, and the invention is lifted from the spent fuel pool along with the lifting of the crane. Therefore, in the process of measuring the compression force of the plate spring, the upper tube seat is supported by the clamping plate 66, and the pressing plate 65 directly abuts against the plate spring, so that the plate spring is clamped between the clamping plate 66 and the pressing plate 65 in the process of measuring, no interference of any other external force exists, the measurement is accurate and reliable, meanwhile, the pressure exerted by the pressing plate 66 on the plate spring is supported by the clamping plate 66 finally due to the support of the clamping plate 66, and the pressure exerted by the clamping plate 66 is transmitted to the matched structure of the screw rod 61 and the screw rod nut 62 of the fuel assembly plate spring compression force measuring device 100 under the action of the clamping protrusion of the core rod 4 and the thrust ball bearing 69, so that the upper tube seat is not subjected to the pressure exerted by the invention in the process of measuring the compression force of the plate spring, the upper tube seat and the fuel assembly are not damaged in the process of measuring the compression force of the plate spring, and the safety of the fuel assembly is ensured. Therefore, the device for measuring the pressing force of the plate spring of the fuel assembly is simple in structure, the upper tube seat and the fuel assembly cannot be damaged in the pressing force measuring process of the plate spring, meanwhile, the device can be operated on a spent fuel pool, and the device is accurate, simple and convenient in measurement and high in practicability.
In addition, the specific structure and operation of the fuel assembly and the top nozzle of the fuel assembly according to the present invention are well known to those skilled in the art, and will not be described in detail herein.
The foregoing description of the preferred embodiments of the present invention is not intended to limit the scope of the claims, which follow, as defined in the claims.
Claims (9)
1. A fuel assembly leaf spring pressing force measuring device for measuring pressing force of a leaf spring in an upper tube seat of a fuel assembly, characterized by comprising:
the outer tube is of a hollow structure;
the upper supporting mechanism comprises a supporting seat and a hanging bracket, and the hanging bracket is arranged on the supporting seat;
the driving mechanism is arranged on the supporting seat, the upper end of the outer tube is connected with the driving mechanism, and the driving mechanism drives the outer tube to rotate;
the core rod is arranged in the outer tube, the upper end of the core rod is connected with a handle, the handle is pivoted on the supporting seat, and the handle is locked with the supporting seat after rotating for a certain angle;
the pressing force measuring mechanism comprises a screw rod, a screw rod nut, a mounting plate, a positioning pin, a pressing plate, a clamping plate, a pressure sensor and a display, wherein the upper end of the screw rod is in butt joint with the lower end of the outer tube, the screw rod nut is arranged on the mounting plate, the lower end of the screw rod penetrates through the screw rod nut in a meshed mode, the upper end of the positioning pin is elastically connected onto the mounting plate, the lower end of the positioning pin penetrates through the pressing plate in a movable mode, the positioning pin is vertically arranged, the pressing plate is located under the mounting plate and parallel to each other, the lower end of the core rod penetrates through the outer tube and then penetrates through the pressing plate and is in detachable connection with the clamping plate, the clamping plate is in a cross structure, a shaft sleeve which is located under the pressing plate and is vertically and slidably arranged, the shaft sleeve is a certain distance away from the clamping plate, the clamping plate is located under the pressing plate and is mutually parallel to each other, and the pressure sensor is arranged on the mounting plate and faces the pressing plate and is electrically connected with the display.
2. The fuel assembly leaf spring pressing force measuring device according to claim 1, further comprising a thrust ball bearing provided between the outer tube and the lead screw, the outer tube and the lead screw being butt-connected by the thrust ball bearing.
3. The device for measuring the pressing force of the leaf spring of the fuel assembly according to claim 2, wherein a clamping protrusion is further arranged on the core rod corresponding to the thrust ball bearing, the clamping protrusion is arranged below the thrust ball bearing, and when the core rod moves vertically upwards, the clamping protrusion is abutted against the thrust ball bearing.
4. The device for measuring the pressing force of the leaf spring of the fuel assembly according to claim 1, wherein the driving mechanism comprises a servo motor and a conical gear set, the servo motor is horizontally arranged on the supporting seat, an output shaft of the servo motor is connected with an input end of the conical gear set, an output end of the conical gear set is connected with an upper end of the outer tube, and the outer tube is driven to rotate in the vertical direction by the horizontal rotation of the servo motor through the conical gear set.
5. The fuel assembly leaf spring compression force measurement device of claim 1 wherein the hanger is of a pi-shaped configuration.
6. The device for measuring the pressing force of the leaf spring of the fuel assembly according to claim 5, wherein two clamping protrusions are arranged on the horizontal part of the hanger, and a limiting groove is formed between the two clamping protrusions.
7. The device for measuring the pressing force of the leaf spring of the fuel assembly according to claim 1, further comprising a pin sleeve vertically arranged on the mounting plate, wherein the upper end of the positioning pin is elastically and slidably clamped in the pin sleeve.
8. The device for measuring the pressing force of the leaf spring of the fuel assembly according to claim 7, wherein a spiral spring is arranged in the pin sleeve, the spiral spring is sleeved outside the upper end of the positioning pin, and the spiral spring is propped between the positioning pin and the pin sleeve.
9. The fuel assembly leaf spring compression force measurement device of claim 1 wherein the clamping plate is removably connected to the stem by interengaging threads.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710395739.0A CN107014538B (en) | 2017-05-31 | 2017-05-31 | Device for measuring pressing force of plate spring of fuel assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710395739.0A CN107014538B (en) | 2017-05-31 | 2017-05-31 | Device for measuring pressing force of plate spring of fuel assembly |
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| Publication Number | Publication Date |
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| CN107014538A CN107014538A (en) | 2017-08-04 |
| CN107014538B true CN107014538B (en) | 2023-06-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710395739.0A Active CN107014538B (en) | 2017-05-31 | 2017-05-31 | Device for measuring pressing force of plate spring of fuel assembly |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108871959A (en) * | 2018-09-18 | 2018-11-23 | 中国核动力研究设计院 | A kind of irradiated fuel assembly compresses flat spring non-linear rigidity measuring device and method |
| CN112880949B (en) * | 2021-01-15 | 2022-02-22 | 中国核动力研究设计院 | Device and method for measuring comprehensive rigidity of compression plate spring of fuel assembly |
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| DE2749998C3 (en) * | 1977-11-08 | 1980-11-20 | Kraftwerk Union Ag, 4330 Muelheim | Spring force measuring device |
| SU746222A1 (en) * | 1978-04-03 | 1980-07-07 | Ивано-Франковское Специальное Конструкторское Бюро Средств Автоматизации | Pressure gauge for depth measuring |
| JPS5961733A (en) * | 1982-09-30 | 1984-04-09 | Mitsubishi Nuclear Fuel Co Ltd | Sensor for measuring support lattice spring force |
| JPS5975131A (en) * | 1982-10-23 | 1984-04-27 | Mitsubishi Nuclear Fuel Co Ltd | Method and device for measuring spring force of support grating elastic support part of fuel assembly |
| DE3242407A1 (en) * | 1982-11-16 | 1984-05-17 | Kraftwerk Union AG, 4330 Mülheim | Method for measuring the spring force of a helical compression spring which is arranged laterally on a web in a mesh of a grid-shaped spacer for a nuclear reactor fuel element, and barrel gauge for carrying out this method |
| US5655636A (en) * | 1995-06-02 | 1997-08-12 | Sundstrand Corporation | Compact actuator including resettable force limiting and anti-backdrive devices |
| TWM253479U (en) * | 2004-03-02 | 2004-12-21 | Chen Hsong Machinery Taiwan Co | Apparatus for detecting force in rotary and horizontal movement |
| JP5309238B2 (en) * | 2012-03-12 | 2013-10-09 | ファナック株式会社 | Nozzle touch force control device for injection molding machine |
| CN202631164U (en) * | 2012-06-07 | 2012-12-26 | 安徽肯达机械科技有限公司 | Wide-range constant force tracking device |
| CN105675196B (en) * | 2016-03-16 | 2018-05-08 | 宁波圣龙汽车动力系统股份有限公司 | The detection device for elasticity of automobile clutch spring ring group |
| CN206960033U (en) * | 2017-05-31 | 2018-02-02 | 中广核研究院有限公司 | Fuel assembly leaf spring compresses force measuring device |
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2017
- 2017-05-31 CN CN201710395739.0A patent/CN107014538B/en active Active
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