CN203241317U - Integrated device for measuring geometric density of uranium dioxide fuel pellet - Google Patents

Abstract

The utility model relates to an integrated device for measuring geometric density of a uranium dioxide fuel pellet. The device comprises an electronic analytical balance, a precision positioning platform fixed on the electronic analytical balance, a group of diameter measuring device and a group of height measuring device, wherein the UO2 pellet is positioned on the precision positioning platform; the diameter measuring device comprises a first light-emitting diode (LED), a first diffuser, a first collimator, a first telecentric optical system and a first HL-CCD; the height measuring device comprises a second LED, a second diffuser, a second collimator, a second telecentric optical system and a second HL-CCD; the first HL-CCD and the second HL-CCD are connected with a computer system. The integrated device can be used for performing simultaneous measurement on the diameter, height and weight of the pellet at a same station and automatic acquisition on measurement data and database management, so that the measurement efficiency of the geometric density of the pellet is greatly improved, the operation is stable, the repeatability is high, and the automation level of pellet check is improved.

Description

A kind of integrated apparatus for the measurement of uranium dioxide pellet geometric density

Technical field

The utility model relates to a kind of for UO ₂The integrated apparatus that the fuel pellet geometric density is measured particularly relates to a kind of working stability, repeatability is high, and automatization level is high is used for UO ₂The integrated apparatus that the fuel pellet geometric density is measured.

Background technology

UO ₂Pellet is by UO ₂The uranium dioxide ceramic body with certain size, shape, intensity and density that powder is repressed, sintering, grinding form, its profile such as small cylindrical are according to UO ₂The technical conditions requirement of pellet, need to be to the diameter of pellet, highly, weight measures, the degree so that checking pellet quality meets the specification and requires calculates UO by these data simultaneously ₂The geometric density of pellet.UO is measured at present used employing ₂The problem of pellet geometric density method maximum is that production efficiency is low, and the probability of manually makeing mistakes is higher.At first because UO ₂Increasing sharply of pellet turnout, reviewer every day need to be to the diameter of pellet, highly, weight carries out up to ten thousand times measurements, these data all be by reviewer's manual entry in computing machine, overall inspection efficient is lower, can't satisfy the needs of output expanding day; And mass data relies on manual entry, and the probability that typing makes mistakes is higher, repeatedly occurs because the quality problems that the data typing makes mistakes and causes; In addition, to UO ₂The measurement of pellet diameter and height was adopted digimatic micrometer to carry out contact in the past and was directly measured, and so not only caused measuring speed slower, and after long-time frequent measurement of digimatic micrometer, easily caused the measuring head wearing and tearing, produced cumulative errors.Therefore needing badly provides a kind of novel UO that is used for ₂The integrated apparatus that the fuel pellet geometric density is measured.

Summary of the invention

The technical problems to be solved in the utility model provides a kind of working stability, repeatability is high, the integrated apparatus that is used for the measurement of uranium dioxide pellet geometric density that automatization level is high.

For solving the problems of the technologies described above, a kind of integrated apparatus for the measurement of uranium dioxide pellet geometric density of the utility model comprises electronic analytical balance, is fixed in precisely locating platform and one group of diameter measuring device and one group of height measuring device on the electronic analytical balance; UO ₂Pellet is positioned on the precisely locating platform; Diameter measuring device comprises a LED, the first fan diffuser, the first collimator, the first telecentric optical system, a HL-CCD; Height measuring device comprises the 2nd LED, the second fan diffuser, the second collimator, the second telecentric optical system, the 2nd HL-CCD; The light beam that the one LED sends is through the first fan diffuser and the first collimator, with parallel beam irradiation UO ₂Then pellet images in a HL-CCD through the first telecentric optical system; The light beam that the 2nd LED sends is through the second fan diffuser and the second collimator, with parallel beam irradiation UO ₂Then pellet images in the 2nd HL-CCD through the second telecentric optical system; The one HL-CCD is connected with computer system with the 2nd HL-CCD.

Precisely locating platform comprises locating piece and positioning ring, and locating piece is provided with columniform projection, and the internal diameter of positioning ring is consistent with the diameter of projection, and the height of projection is less than the positioning ring axial length; UO ₂Pellet is positioned on the projection, is positioned within the positioning ring.

The first telecentric optical system and a HL-CCD integral body place on the diameter measurement hoistable platform, realize 7mm, 5mm, three kinds of scanning distances of 3mm.

The utility model realized pellet diameter, highly, weight measures in a station, and automatic collection and the data base administration of measurement data have greatly improved the measurement efficient of pellet geometric density.The in-site measurement data have reduced a large amount of papery refuses after having realized with no paper at all, realize energy-saving and emission-reduction, and Green Development has been made positive contribution.By client is installed, can easily realize telemanagement, comprise the inquiry, statistics of data etc., improved the quality management level in company, workshop.The utility model is highly stable, repeatability is high, has improved the automatization level of pellet check.

Description of drawings

Fig. 1 is the schematic diagram of a kind of integrated apparatus of measuring for the uranium dioxide pellet geometric density provided by the utility model.

Fig. 2 is the schematic diagram of locating piece and positioning ring.

Among the figure: 1 is cable, and 2 is display controller, and 3 is PC, and 4 is a HL-CCD, 5 is the first telecentric optical system, and 6 is the diameter measurement hoistable platform, and 7 is precisely locating platform, and 8 is electronic analytical balance, 9 is the UO2 pellet, and 10 is the first collimator, and 11 is the first fan diffuser, 12 is server, and 13 is the 2nd HL-CCD, and 14 is the second telecentric optical system, 15 is the second collimator, and 16 is the second fan diffuser, and 17 is the 2nd LED, 18 is a LED, and 19 is locating piece, and 20 is positioning ring.

Embodiment

Below in conjunction with drawings and Examples the utility model is described in further detail.

The utility model comprises electronic analytical balance 8, is fixed in precisely locating platform 7 and one group of diameter measuring device and one group of height measuring device on the electronic analytical balance 8.

Precisely locating platform 7 comprises locating piece 19 and positioning ring 20, and locating piece 19 is provided with columniform projection, and the internal diameter of positioning ring 20 is consistent with the diameter of projection, and the height of projection is less than positioning ring 20 axial lengths; UO ₂Pellet 9 is positioned on the projection, is positioned within the positioning ring 20.

Diameter measuring device comprises a LED18, the first fan diffuser 11, the first collimator 10, the first telecentric optical system 5, a HL-CCD4; The first telecentric optical system 5 and a HL-CCD4 integral body place on the diameter measurement hoistable platform 6, realize 7mm, 5mm, three kinds of scanning distances of 3mm; Height measuring device comprises the 2nd LED17, the second fan diffuser 16, the second collimator 15, the second telecentric optical system 14, the 2nd HL-CCD13.

The light beam that the one LED18 sends is through the first fan diffuser 11 and the first collimator 10, with parallel beam irradiation UO ₂Then pellet 9 images in a HL-CCD4 through the first telecentric optical system 5; The light beam that the 2nd LED17 sends is through the second fan diffuser 16 and the second collimator 15, with parallel beam irradiation UO ₂Then pellet 9 images in the 2nd HL-CCD13 through the second telecentric optical system 14; The one HL-CCD4 and the 2nd HL-CCD13 are by cable 1 and display controller 2, and PC 3 connects.PC 3 is connected with server 12.

The physical dimension that this device need to be measured is the diameter of pellet, highly, by pellet diameter and the height of measuring gained, just can draw the cumulative volume of right cylinder pellet, (cavity volume is obtained by another systematic survey then to deduct chamfering and dish cavity volume partly, here generally be defaulted as constant), and then obtaining the volume of pellet, fair employing electronic analytical balance 8 is measured, and utilizes density formula can calculate the geometric density of pellet.

$\mathrm{\ρ}=\frac{M}{V}$

$=\frac{M}{\mathrm{\π}\·{\left(\frac{D}{2}\right)}^2\·H-V_v}---\left(1\right)$

In the formula: ρ: the geometric density of pellet, g/cm ³

M: pellet weight, g;

D: pellet diameter, cm;

H: pellet height, cm;

Vv: cavity volume, by constant calculations, cm ³

Automatic measurement system adopts the optics method of blocking to carry out to the measurement of pellet diameter and height, measuring principle is that the radiant light that LED sends becomes the uniform directional light of certain width through scattering device and collimator camera lens, then project on the pellet to be measured, because pellet is light tight and part that self blocks presents shade.The part directional light that is not blocked, the telecentric optical system that enters receiving end.The effect of telecentric optical system is only to allow directional light to see through, with the precision of guaranteeing to measure.By entering HL-CCD(high-speed linear CCD after the telecentric optical system), the image of tested like this pellet just is presented at HL-CCD.Light-struck clear zone that is in the HL-CCD upstream is in the dark space by what determinand blocked, measures parameter to be measured by the edge that detects clear zone and dark space.Because the boundary between clear zone and the dark space is not very clear, therefore must carry out rim detection before output parameter, native system adopts DE(numeral rim detection) the processor edge detects.After rim detection is finished, carry out data by CPU and process, again data communication device is crossed Serial Port Line and be transferred to computing machine.

Table 1UO ₂Pellet diameter, height-gauge performance table

Table 2UO ₂Pellet is weighed with electronic analytical balance performance table

Measurement range	0~120g
		Readable	0.1mg
Average response time	≤2s
		Repeatability	≤±0.1mg
Linear	≤±0.2mg

The fuel ball diameter is to affect under the nuclear reactor operating condition UO ₂One of mechanical interaction (PCI) factor of pellet 9 and involucrum.Pellet is in the situation that exist deviation in tapering, cylindricity after finishing grinding, only a section in the middle of the pellet is measured the real conditions that can't effectively reflect pellet diameter, therefore guaranteeing under the prerequisite of precision, for more accurately obtaining the measured value of pellet diameter, pellet diameter is carried out multimetering necessary.Emission has the directional light of certain width according to light transmission formula sensor emission device, thereby receiver obtains the principle of dimension of object by the image that receives its central cross-section object under test, and measuring system will take the receiver of stepper motor drive installation on diameter measurement hoistable platform 6 to finish the scanning measurement of diameter.Under the prerequisite that guarantees precision, can satisfy 7mm, 5mm, three kinds of scanning distances of 3mm select (each distance can scan 20 points, can select maximal value, minimum value, mean value).The measurement of pellet diameter can be selected four kinds of modes, is respectively 1 point, 3mm, 5mm, 7mm measurement.

Claims (3)

1. An integrated device for measuring the geometric density of uranium dioxide fuel pellets is characterized in that: it comprises an electronic analytical balance, a precision positioning platform fixed on the electronic analytical balance, and a group of diameter measuring devices and A set of height measuring devices; the UO ₂ core block is located on a precision positioning platform; the diameter measuring device includes a first LED, a first diffuser, a first collimator, a first telecentric optical system, a first HL -CCD; the height measuring device includes a second LED, a second diffuser, a second collimator, a second telecentric optical system, and a second HL-CCD; the light beam emitted by the first LED is diffused by the first The device and the first collimator irradiate the UO _core block with a parallel beam, and then image it on the first HL-CCD through the first telecentric optical system; the beam emitted by the second LED passes through the second diffuser and The second collimator irradiates the _UO core block with a parallel beam, and then forms an image on the second HL-CCD through the second telecentric optical system; the first HL-CCD and the second HL-CCD are connected to the computer system . 2. An integrated device for measuring the geometric density of uranium dioxide fuel pellets according to claim 1, characterized in that: the precise positioning platform includes a positioning block and a positioning collar, and the positioning block is provided with There is a cylindrical protrusion, the inner diameter of the positioning collar is consistent with the diameter of the protrusion, and the height of the protrusion is smaller than the axial length of the positioning collar; the UO ₂ core block is located on the protrusion , located within the positioning collar. 3. The integrated device for measuring the geometric density of uranium dioxide fuel pellets according to claim 1, characterized in that: the first telecentric optical system and the first HL-CCD are integrally placed in the diameter measurement On the lifting platform, three scanning distances of 7mm, 5mm and 3mm are realized.

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