Gamma-flaw detector

FIELD: machine building.

SUBSTANCE: gamma-flaw detector includes a composite protection unit in the form of a stationary one-piece cylinder equipped with an eccentric cavity and a collimation outlet opening and corresponding to the eccentric cavity of a turning rotor equipped by means of a protective rod-shaped holder with an emission source in the eccentric channel with a hole coaxial to the collimation opening, and device for rotor turning through 180°. On the drive half-axis of the rotor there reinforced is a gear with external engagement, the end surface of which is formed with an arc-shaped groove concentrically to its constituent surface; the above groove provides the possibility of its discrete rotation together with the rotor in the azimuth angle range of 180°, which is strictly restricted with a limit stop corresponding to the groove profile and made in the form of a cylindrical pin statically reinforced in the housing. The gear is constantly adjacent kinematically and in a reduced manner (reduction of not less than 2) to a sector of a gear wheel, which is polarised by means of a spring and reinforced on the corresponding axis with possibility of pendulum movements transmitted to it with a rotor turning device through the gear and providing the polarised power fixation of the rotor in diametrically opposite discrete positions of emission and overlapping of a radiation beam.

EFFECT: increasing safety and improving reliability of protective properties considering sanitary norms of radiation security, improving accuracy and reliability of the control method.

4 cl, 4 dwg

 

The invention relates to the field of materials research without their destruction, but rather for gamma radiography.

Known gamma-ray detectors for x-ray controlled objects, such as apparatus for radiographic inspection of products, conveyor belt source drum (revolving or rotary) type, providing a revolving supply source to the output window static protection unit, equipped with a concentric cavity for placement of a conveyor made in the form of a 180° rotatable drum containing in its channel the radiation source is placed on the end portion of the rod holder, and has a fixation mechanisms, control the rotation of the drum, and a locking device [Gamma-apparatus for radiographic inspection, U.S. patent No. 2891168, publ. 16.06.1959].

Known gamma-detector emitter containing block radiation protection installed on the bearings of the rotor for moving the radiation source from the safe position with the maximum absorption of radiation protective material in the position of the transmission, coaxial conical exhaust box, supplied with a corresponding removable obturator, and the emitter is equipped with automated controls and fixation of the rotor. [The emitter of gamma rays, U.S. patent No. 2984748, publ. 16.05.1961].

Naib is more similar in purpose and design is the gamma detector drum, in which the gamma radiation source is moved from the storage position to the position of scanning to collimation window when turning the drum by 180°, is placed in an eccentric cavity fixed block security [Apparatus for radiographic testing hollow articles, U.S. patent No. 2719926, publ. 04.10.1955].

Known flaw detector consists of a body made of a protective material, provided with an eccentric cylindrical cavity with an outlet window containing the corresponding fitted coaxially exhaust window channel with a source of radiation drum from a protective material made with the possibility of remote rotation and fixation in discrete positions by means of spring elements, and equipped with a mechanism to control the rotation of the drum, and a locking device.

The General disadvantages of the known flaw drum due to the inertia of the rotary drum and constructive play in kinematic pairs flaw is the lack of clear orientation of the radiation source in diametrically-opposite positions of scanning and storage, provoking the formation while the distorted flow direct and multiply scattered radiation, respectively, from the local diffusion and leakage of scattered radiation and the channel of the rotary drum in the boundary zones of its junction with the array static block of biological protection and outlet ports (collimator) guaranteed by design clearances rolling and static components protection, which entails the possibility of increasing the radial loads on the staff and is reflected in the safety of the method of control.

At the same time fuzzy fixing heater collimating Windows in the radiographic studies does not provide the necessary statistical significance in the comparison of control results in an unstable geometry of the distribution of dose field.

The technical result obtained by the proposed device is to improve the safety and reliability of the protective properties with the sanitary rules of radiation safety, as well as the validity and reliability of the method of control by modifying the kinematics of fixed movements of the radiation source in the release position and overlap of the beam with the formation of compensating protective mazes when the overlap of the beam of radiation.

This technical result is achieved due to the fact that gamma-ray detector containing precast block protection in the form of a stationary cylinder, provided with an eccentric cavity and collimation output window, and the corresponding cavity of the rotatable rotor, equipped by protective rod holder radiation source in an eccentric channel opening, coaxially collimation window, the means of rotation of the rotor by 180°, at the leading of the axis of the rotor fortified gear wheel with external toothing, the face surface of which is concentric with its forming surface shaped arcuate recess to enable discrete rotation together with the rotor in the range of the azimuthal angle of 180°, strictly limited to the relevant profile seizure focus, made in the form of a cylindrical finger statically fixed in the housing, and gear kinematically reducyrovana (reduction of not less than 2) constantly paired with polarized by the spring tension of the sector gear mounted on a respective axis with the possibility of pendulum movements reported to it by means of rotation of the rotor through the gear and providing a polarized power fixation of the rotor in diametrically opposite the discrete positions of the release and blocking a beam of radiation, and in the described detector specified technical result is obtained in the case when the gear wheel with external toothing mounted on the leading axis of the rotor, with the possibility of adjustment of the working position of the rotor according to the azimuthal location locally perforated holes in it relative to the output collimating open and shaped arcuate grooves on the face surface of the gear, which is moznosti of rotation of the rotor in the range of the azimuthal angle of 180°, and also in the case when the rod holder is attached to a radiation source made with the possibility of limited displacement along the axis of the eccentric channel of the rotor relative to the holes in the channel with the formation of the protective maze in the initial state of the rotor in an overlapped beam of radiation, for which a peripheral part of the protective rod holder outside the channel of the rotatable rotor provided with an annular groove, kinematically associated with a statically fixed to the chassis spatial profiled Cam whose profile is consistent with the trajectory and the program relative displacements of the source holder during rotation of the rotor in the range of the azimuthal angle of 180°, and the angle of ascent profile is proportional to the axial displacement of the rod holder with the radiation source and when the peripheral surface of polarized sector gear provided with a groove, configured to lock the latch locking device in its original state.

The proposed device (gamma detector) is shown in figure 1, 2, 3 and 4.

The device includes a housing 1, a stationary protection block 4 with the output collimation window 3, an eccentric cavity 2 to accommodate the rolling of the rotor 5, containing in turn in the channel with a hole 8, the radiation source 7 and protection of the hydrated rod holder 6, the peripheral portion of which is provided with the annular groove 19 and kinematically associated with a statically fixed to the housing 1 spatial shaped Cam 20. The device also includes means of rotation of the rotor 9 and is equipped with a kinematic pair of polarized fixation of the rotor in diametrically opposite the discrete positions of the release and blocking a beam of radiation in the form of arcuate shaped recess 13 of the gear 17, fortified with alignment on the axis of the rotor 16 and provides an exceptional opportunity of rotation of the rotor 5 in the range of the azimuthal angle of 180°, strictly limited to the relevant profile seizure focus in the form of a cylindrical finger 12, statically fixed in the housing 1, and the gear 17 while kinematically reducyrovana (reduction of not less than 2) constantly paired with polarized by means of spring tension 15 sector gear 10, mounted on the axis 11 with the possibility of discrete-fixed pendulum movements reported to it by means of rotation of the rotor 9 through the gear 17. Device provided with means for locking the leading axis of the rotor 16 and the rotor 5 in the initial state (at the blocked beam), respectively, in form of lock 14 with the key 21 and the retainer 18, the respective groove 22 on the peripheral surface of polari is consistent sector 10.

The device operates as follows.

The device body 1, provided with a cavity containing 2 and collimation output window 3 stationary protection block 4 and the corresponding cavity rotating the rotor 5, is equipped with a rod holder 6 with the radiation source 7 in the channel with a hole 8, coaxially collimation output window 3, with means of rotation of the rotor 9 are transferred to the control object, locked by the lock 14. Then the key 21 open lock 14 and when this will unlock the sector 10 through the output latch 18 from the groove 22. By means of rotation 9 lead leading the axis of the rotor 16 with fixed gear 17 and the rotor 5 is rotationally driven in the range of the azimuthal angle of 180°, strictly limited corresponding to the profile of the recess 13 a focus in the form of a cylindrical finger 12. This combines the axis of the hole channel 8 of the rotor 5 with the output collimation window 3, and polarized by means of spring tension 15 sector gear 10 through the gear 17 provides guaranteed power fixation of the rotor 5 in the release position of the radiation beam. Simultaneously with the rotation of the rotor 5 includes a radiation source 7 protective rod holder 6, the peripheral portion of which is provided with the annular groove 19 and kinematically associated with a statically fixed to the body 1 of the spatial to the Cam 20, interacts with its profile relative reciprocal movement, providing strictly coordinated a limited axial displacement of the radiation source 7 from the position of the maze of storage in the channel 8 to its outlet opening, coaxially collimation window 3, and lock it in this state, excluding the possibility of arbitrary play of the emitter in the working position on the exposure time.

After the exposure time the rotor 5 lead to the initial state by means of rotation 9 leading through the axis of the rotor 16 with fixed gear 17 at the expense of the return rotational movement range of the azimuthal angle of 180°, strictly limited corresponding to the profile of the recess 13 a focus in the form of a cylindrical finger 12, and polarized by means of spring tension 15 sector gear 10 through the gear 17 provides guaranteed power fixation of the rotor 5 in the initial position blocked by the radiation beam. Simultaneously with the return of the rotor 5 to the initial position is equipped with a radiation source 7 protective rod holder 6, the peripheral portion of which is provided with the annular groove 19 and kinematically associated with a statically fixed to the housing 1 spatial Cam 20, interacts with its profile, provides a limited axial displacement is of ergates 6 from the radiation source 7 from the position of scanning of the output window channel 8, coaxial collimation output window 3, and fix it in the maze storage channel 8, excluding the possibility of arbitrary play of the emitter at the time of overlap of the beam of radiation.

When the manipulation of the operator by means of rotation of the rotor 9 kinematic securing devices provide a logically consistent with the operator's actions force the fixation of the rotor 5 in two diametrically opposite discrete positions. In the hard mode of the algorithm when this is achieved the fixed displacement of the emitter relative to the outlet ports of the rotor, resulting in a clear orientation of the radiation source in diametrically-opposite positions of scanning and storage without distorting the flow of direct radiation, local diffusion and leakage of scattered radiation from a channel of the rotary drum in the boundary zones of his mates, which excludes the possibility of increasing the radial loads on the staff, and increases the security method of control.

At the same time exclude unwanted distortion of the collimated radiation beam and is provided with regularly recurring stable distribution chart dose field that determines the quality of radiographic testing method.

1. Gamma-ray detector containing precast block protection in the form of monolithic institutional the ary cylinder, provided with an eccentric cavity and collimation output window, and the corresponding eccentric cavity of the rotatable rotor, equipped by protective rod holder radiation source in an eccentric channel opening, coaxially collimation the window, and the means of rotation of the rotor by 180°, characterized in that the leading axis of the rotor fortified gear wheel with external toothing, the face surface of which is concentric with its forming surface shaped arcuate recess to enable discrete rotation together with the rotor in the range of the azimuthal angle of 180°, strictly limited to the relevant profile seizure focus, made in the form of a cylindrical finger statically fixed in the housing, and gear kinematically reducyrovana (reduction of not less than 2) constantly paired with polarized by the spring tension of the sector gear mounted on a respective axis with the possibility of pendulum movements reported to it by means of rotation of the rotor through the gear and providing a polarized power fixation of the rotor in diametrically opposite the discrete positions of the release and blocking a beam of radiation.

2. Gamma flaw detector according to claim 1, characterized in that the gear wheel with external toothing fortified ve on the current axis of the rotor, with the possibility of adjustment of the working position of the rotor according to the azimuthal location locally perforated holes in it relative to the output collimating open and profiled arcuate grooves on the face surface of the gear to provide rotation of the rotor in the range of the azimuthal angle of 180°.

3. Gamma flaw detector according to claim 1, characterized in that the rod holder connected with the radiation source made with the possibility of limited displacement along the axis of the eccentric channel of the rotor relative to the holes in the channel with the formation of the protective maze in the initial state of the rotor in an overlapped beam of radiation, for which a peripheral part of the protective rod holder outside the channel of the rotatable rotor provided with an annular groove, kinematically associated with a statically fixed to the chassis spatial profiled Cam whose profile is consistent with the trajectory and the program relative displacements of the source holder during rotation of the rotor in the range of the azimuthal angle of 180°, and the angle of ascent profile is proportional to the axial the displacement of the rod holder with the radiation source.

4. Gamma flaw detector according to claim 1, characterized in that the peripheral surface of polarized sector gear provided with a groove, configured to lock the latch locking device in the initial state.



 

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