CN2383071Y - Special probe for ash content measurer - Google Patents

Abstract

The utility model relates to a special probe for an ash content measurer, which is used for directly measuring the ash content in coal on site. The utility model comprises a < 241 > Am radioactive source, a fixed lead screen, a rotary lead screen controlled by a step motor and a detector which is composed of a NaI (T1) scintillation crystal and a multiplier phototube GDE. The special probe is inserted in the coal and directly, accurately and rapidly measures the content of the ash content in the coal, and the content of the ash content is given out in decades of seconds on site. The special probe is especially suitable for the use of sites for producing coal and using coal.

Description

The dedicated probe of ash analyzer

The utility model relates to a kind of dedicated probe that can measure the ash analyzer of original coal ash part at the scene.

At present, the mensuration of original coal ash part adds the classical way of burning to weigh, and the coal sample is by granularity requirements division sampling, through pulverizing, dry, weigh, burn, weigh, calculate the ash value.Analytical cycle grows, takes a lot of work, time-consuming, can not in time instruct production.External existing instrument based on γ-γ density detection coal seam ash, but result precision is poor, specimen preparation is also more loaded down with trivial details, domestic also have a similar report, but do not see and be suitable for the on-the-spot coal seam of directly measuring, coal ash in the dump directly provides result's the analyzer of ash quickly and accurately, and its key is not have the dedicated probe of practical ash analyzer.

The purpose of this utility model provide a kind of easy to carry, directly insert in the dump, just can accurately provide the ash content of coal in the coal fast, on-the-spot dedicated probe with coal ash analyzer.

The dedicated probe of the ash analyzer of the utility model design is achieved in that

The dedicated probe of the ash analyzer of the utility model design includes radioactive source, scatter correction device and detector etc., the radioactive source that it is characterized in that ash analyzer dedicated probe be cadmium-241 ( ²⁴¹Am) radioactive source [4], the scatter correction device is driven, is had the rotating outer lead shield [8] of opening to form by lead shield [5] in fixing and stepper motor [9], detector is by sodium iodide scintillation crystal-NaI (Tl) [1] and photomultiplier GDB[2] and peripheral antimagnetic material [3] form ²⁴¹Am radioactive source [4] places in the fixing interior lead shield [5], and fixing interior lead shield [5] leaves the correction collimating aperture [6] of radioactive source towards the top of sodium iodide scintillation crystal [1], be provided with scattering mouth [7] with proofreading and correct collimating aperture [6] vertical direction, and stepper motor [9] places and is equipped with ²⁴¹Below the fixing interior lead shield [5] of Am radioactive source [4] and the rotating outer lead shield [8], and have control signal transmission cable [11] to be electrically coupled to single-chip microprocessor system [13], photomultiplier GDB[2] there is ray signal transmission cable [10] to be electrically coupled to signal processing system [12].

The linear relationship that the dedicated probe of the ash analyzer that the utility model proposes is based on backscattering gamma spectrum peak position energy that the effect of gamma-rays and coal sample produces and its ash content of coal is measured the content of ash.In the dedicated probe insertion coal of the ash analyzer that the utility model designs, ²⁴¹The ray of Am is via the coal of scattering mouth directive probe outside, produced the backscattering line by its backscattering again and act on the photon that produces behind NaI (Tl) crystal, be converted into electric signal input signal disposal system through photomultiplier GDB, provide relevant backscattering data, handle through single chip microcomputer, directly provide the ash value, ²⁴¹Am radioactive source [4] a time by collimation correction hole [6] directive NaI (Tl) scintillation crystal electric signal that ray produced is exclusively used in spectrum and proofreaies and correct, to guarantee the stable of spectrum.Outer lead shield control by the program control rotation of stepper motor [9] ²⁴¹Am source [4] is respectively applied for proofreaies and correct and the backscattering measurement, not only makes things convenient for accurately but also quick, and the scene provides the ash content of coal of coal, is convenient to on-the-spot technology regulation and control, has improved production efficiency.

Further specify below in conjunction with accompanying drawing:

Accompanying drawing is the synoptic diagram of the ash analyzer dedicated probe that provides of the utility model, as shown in the figure: stepper motor [9] is housed in the probing shell [14] that the macromolecular material of garden cylindricality is manufactured successively, rotate outer lead shield [8], fix in lead shield [5], ²⁴¹Am radioactive source [4], NaI (Tl) scintillation crystal [1], photomultiplier GDB[2] and antimagnetic material [3], stepper motor has control signal transmission cable [11] to be electrically coupled to single-chip microprocessor system [13], photomultiplier [2] is electrically coupled to signal processing system [12] by ray signal transmission cable [10], the correction collimating aperture [6] of radioactive source is arranged at lead shield [5] top in fixing, perpendicular direction has scattering mouth [7], rotating outer lead shield [8] has a breach, handles the turned position of rotating outer lead shield [8] by the program control stepper motor [9] of single chip microcomputer [13] and makes radioactive source ²⁴¹Am[4], be in full-shield, correction and three states of measurement respectively, promptly do not allow ray shoots to any direction, only allow ray to pass through correction collimating aperture [6] directive NaI (Tl) scintillation crystal [1] of radioactive source, only allow ray by scattering mouth [7], the peripheral coal of directive probe, produce the backscattering ray shoots to [1] three kind of state of NaI (Tl) scintillation crystal through coal, handle sampled signal by single chip microcomputer [13], provide the coal the ash content of coal through signal processing system [12] and single chip microcomputer [13] processing.During use,, just can obtain accurate analytical results after tens seconds as long as dedicated probe is inserted in the coal.

The dedicated probe of the ash analyzer that the utility model proposes is owing to adopted the backscattering sensitivity ²⁴¹The Am radioactive source, the Φ 50 * 50 that efficient is high NaI (Tl) scintillation crystal detectors, the program control operation of unique in addition fixing and controlled rotation lead shield uses same radioactive source to proofread and correct and backscattering is measured, and has improved the precision and the accuracy of test.The mensuration that makes ash in the coal not only fast but also accurate, was particularly suited for in-site measurement.

Claims (1)

1, the dedicated probe of ash analyzer includes radioactive source, scatter correction device, detector etc., the radioactive source that it is characterized in that ash analyzer dedicated probe be cadmium-241 ( ²⁴¹Am) radioactive source [4], the scatter correction device is the controllable scattering means for correcting of fixing interior lead shield [5] and being made up of the rotating outer lead shield [8] that opening is arranged that stepper motor [9] drives, detector is by sodium iodide scintillation crystal-NaI (Tl) [1] and photomultiplier GDB[2] and peripheral antimagnetic material [3] form ²⁴¹Am radioactive source [4] places in the fixing interior lead shield [5], and fixing interior lead shield [5] leaves the correction collimating aperture [6] of radioactive source towards the top of NaI (Tl) scintillation crystal [1], is provided with scattering mouth [7] with proofreading and correct collimating aperture [6] vertical direction, and stepper motor [9] places and is equipped with ²⁴¹Below the inside and outside lead shield [5] of Am radioactive source [4], [8], and have control signal transmission cable [11] to be electrically coupled to single-chip microprocessor system [13], photomultiplier GDB[2] there is ray signal transmission cable [10] to be electrically coupled to signal processing system [12].