CN210223582U - Neutron monochromator shielding device - Google Patents
Neutron monochromator shielding device Download PDFInfo
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- CN210223582U CN210223582U CN201920698456.8U CN201920698456U CN210223582U CN 210223582 U CN210223582 U CN 210223582U CN 201920698456 U CN201920698456 U CN 201920698456U CN 210223582 U CN210223582 U CN 210223582U
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Abstract
The utility model discloses a neutron monochromator shield assembly, it includes: the neutron shielding chamber is of a hollow shell structure, and is provided with a neutron guide pipe inlet and a neutron emergent window; a rail assembly on which a rail extending from an upstream side to a downstream side of the self-shielded room is formed; the shielding chain car assembly comprises a pulley arranged on a guide rail in a sliding manner, a window shielding block fixedly arranged in the middle of the pulley, and N +1 upper shielding blocks and M +1 lower shielding blocks which are arranged on the pulley on two sides of the window shielding block; an emergent neutron channel communicated with the neutron emergent window is arranged on the window shielding block; the driving turntable assembly comprises a driving turntable, a straight guide rail pair and a driving arm; the driving turntable is arranged below the main shielding chamber in a coaxial manner, a guide rail of the straight guide rail pair is horizontally fixed on the driving turntable, and the driving arm is vertically fixed on a sliding block of the straight guide rail pair; the driving arm is fixedly connected with a window shielding block of the shielding chain car assembly.
Description
Technical Field
The utility model relates to a neutron monochromator shielding (monochromator shielding) device is particularly useful for one kind and builds on the neutron spectrometer at bunch middle part, belongs to neutron scattering technical field.
Background
The neutron monochromator is one of core components of a reactor-based neutron scattering spectrometer and is used for monochromating white-light neutrons led out from a reactor or a neutron guide tube, and the monochromatic neutrons strike a sample to carry out related neutron scattering experiments. In order to radiate safely and effectively reduce the background of neutron scattering experiments, the monochromator must be placed in a monochromator shielding device. Along with the change of the takeoff angle of the monochromator, the emergent neutron channel of the monochromator shielding device needs to be correspondingly changed so as to ensure the effective output of neutron beams.
At present, a neutron monochromator shielding device in the shape of a small shielding drum is disclosed in the publication "neutron triaxial spectrometer, hook, et al, atomic energy science and technology, 1988, vol.22, No. 2"; the invention discloses a neutron monochromator shielding device with a continuously variable takeoff angle (with an authorization notice number of CN 101599307B) and a publication, namely a neutron monochromator shielding device with a continuously variable takeoff angle, high wave building and the like, China mechanical engineering, 2010, volume 21, No. 3, and discloses a monochromator shielding device with a layered drum-shaped structure mainly made of heavy concrete. The invention patent' a monochromator shielding device of a cold neutron spectrometer (No. CN 104778986B) discloses a neutron monochromator shielding device used for a cold neutron spectrometer in a pulling mode. The overseas reports of Optimization of a partial non-magnetic primary amplification shielding for the triple-axis spectrometer PANDA at the Munich-flux reactiver FRM-II, N.M. Pyka, etc., APPL. Phys.A 74[ supplied ],2002 "mainly report a heavy concrete and boron-doped high-density polyethylene composite material adopted by a neutron monochromator shielding device, and do not disclose reports of the structure of changing a neutron channel.
The neutron monochromator shielding devices disclosed by the domestic and foreign documents or the invention patents are limited in the takeoff angle of the neutron monochromator if being used for a spectrometer built at a certain gap position in the middle of a beam line, and neutron energy is more sensitive to a small takeoff angle, so that the highest neutron energy range of the neutron spectrometer can be influenced.
Disclosure of Invention
To the above problem, the utility model aims at providing a neutron monochromator shield assembly, the device can satisfy the shielding and reduce the requirement of experiment background, can provide the high-energy neutron scope again.
In order to achieve the above object, the utility model discloses a following technical scheme, a neutron monochromator shield assembly, its characterized in that, it includes:
the neutron shielding chamber is of a hollow shell structure, and is provided with a neutron guide pipe inlet and a neutron emergent window;
a rail assembly disposed at a front side thereof in a coaxial manner with the main shield room, the rail assembly having a rail formed thereon extending from an upstream side to a downstream side of the main shield room;
the shielding chain car assembly comprises a chain car, a window shielding block, N +1 upper shielding blocks and M +1 lower shielding blocks, wherein the chain car is arranged on the guide rail in a sliding manner, the window shielding block is arranged in the middle of the chain car, and the N +1 upper shielding blocks and the M +1 lower shielding blocks are arranged on the chain car on two sides of the window shielding block; an emergent neutron channel communicated with the neutron emergent window is arranged on the window shielding block; the window shielding block is in clearance fit with the upper shielding block, the lower shielding block, the upper shielding block and the lower shielding block;
the driving turntable assembly comprises a driving turntable, a straight guide rail pair and a driving arm; the driving turntable is arranged below the main shielding chamber in a coaxial manner, a guide rail of the straight guide rail pair is horizontally fixed on the driving turntable, and the driving arm is vertically fixed on a sliding block of the straight guide rail pair; the driving arm is fixedly connected with a window shielding block of the shielding chain car assembly, so that the shielding chain car assembly is linked with the driving turntable assembly.
Preferably, the cross section of the main shielding chamber is in a circular arc splicing rectangle, the front side wall of the main shielding chamber is in a circular arc structure, the neutron exit window is formed in the front side wall of the main shielding chamber along the circular arc direction of the front side wall, and a neutron guide pipe inlet and a neutron guide pipe outlet are respectively formed in two side walls of the main shielding chamber adjacent to the front side wall.
Preferably, the guide rail assembly further comprises a guide rail support frame, the guide rail comprises a middle guide rail arranged on the guide rail support frame, and an upstream straight guide rail and a downstream straight guide rail which are arranged on the guide rail support frame and distributed on two sides of the middle guide rail; the middle guide rail and the main shielding chamber are coaxially distributed and wrapped at the front side of the main shielding chamber, and the upstream straight guide rail and the downstream straight guide rail are in smooth transition connection with the middle guide rail; the top surface of guide rail is formed with the recess, the recess including form in the top surface middle part of straight guide rail of upper reaches, middle guide rail and the straight guide rail of low reaches and in proper order smooth and smooth transition connection upper reaches recess, middle recess and low reaches recess, the chain car slides and sets up in the recess.
Preferably, the driving turntable is a mechanical transmission mechanism with a rotating function and composed of a large gear and a small gear driven by a motor, and is used for driving the driving arm to rotate so as to drive the shielding chain car assembly to move along the guide rail; the driving arm is of an inverted L-shaped structure, and the extension section of the top of the driving arm is fixedly connected with the window shielding block of the shielding chain car assembly.
Preferably, the chain comprises M + N Z-shaped cushion blocks, a middle cushion block, M + N +2 bearing platforms, M + N +2 positioning cylinders, M + N +2 bearing bushes, an upstream cushion block and a downstream cushion block; each Z-shaped cushion block is provided with a high platform and a low platform, each bearing platform is fixedly provided with one positioning cylinder, and one bearing bush is sleeved on one positioning cylinder in a clearance fit manner;
the guide rail is characterized in that N +1 bearing platforms are arranged on the upstream section of the guide rail at intervals in a sliding manner, and N Z-shaped cushion blocks are placed on the N +1 bearing platforms; from the upstream end of the guide rail, the upstream cushion block is sleeved on the 1 st bearing pad and then lapped on the 1 st bearing platform, the high platform of the 1 st Z-shaped cushion block is sleeved on the 1 st bearing pad and then lapped on the upper end surface of the upstream cushion block, the low platform of the 1 st Z-shaped cushion block is sleeved on the 2 nd bearing pad and then lapped between the 1 st bearing platform and the 2 nd bearing platform, the high platform of the ith Z-shaped cushion block is sleeved on the ith bearing pad and then pressed on the upper end surface of the low platform of the i-1Z-shaped cushion block, the low platform of the ith Z-shaped cushion block is sleeved on the i +1 th bearing pad and then lapped between the i +1 th bearing platform and the i +1 th bearing platform, i is 2, a.., N;
m +1 bearing platforms are arranged on the downstream section of the guide rail at intervals in a sliding manner, M Z-shaped cushion blocks are placed on the M +1 bearing platforms, from the downstream end of the guide rail, the downstream cushion blocks are sleeved on the 1 st bearing platform after the 1 st bearing bush, the 1 st Z-shaped cushion block is sleeved on the 1 st bearing bush and then is overlapped on the downstream cushion block, the 1 st Z-shaped cushion block is sleeved on the 2 nd bearing bush and then is overlapped between the 2 nd bearing platform and the 1 st bearing platform, the ith Z-shaped cushion block is sleeved on the ith bearing bush and then is pressed on the upper end surface of the i-1 th Z-shaped cushion block, the ith Z-shaped cushion block is sleeved on the i +1 th bearing platform and then is pressed between the i +1 th bearing platform and the ith bearing platform, i is equal to 1, .., M;
one end of the middle cushion block is sleeved on the upper end surface of the lower platform of the Mth Z-shaped cushion block from the downstream end and then pressed on the upper end surface of the lower platform of the Mth Z-shaped cushion block, and the other end of the middle cushion block is sleeved on the upper end surface of the lower platform of the Nth Z-shaped cushion block from the upstream end and then pressed on the upper end surface of the lower platform of the Nth Z-shaped cushion block from the N +1 th bearing block;
the window shielding block is positioned above the middle part of the middle cushion block and is fixedly connected with the driving arm, and the N +1 upper shielding blocks are correspondingly connected with the N +1 positioning cylinders on the bearing platform one by one; and the M +1 lower shielding blocks are correspondingly connected with the M +1 positioning cylinders on the bearing platform one by one.
Preferably, each bearing platform is provided with a first bearing pair with a rotation axis vertical to the ground and a second bearing pair with a rotation axis parallel to the ground, and the center distance of the first bearing pair of the bearing platform is L; a first bearing pair on each bearing platform is embedded into the groove on the guide rail in a clearance fit manner; a second bearing pair on each bearing platform is tangent to the upper end surface of the guide rail;
the width of the groove on the guide rail is the same as the diameter of the first bearing pair on the bearing platform, and the depth of the groove is larger than the height of the first bearing pair on the bearing platform.
Preferably, the driving arm is fixedly connected with the window shielding block through a sliding shaft sleeve, wherein a first round hole is formed in the center of the middle cushion block, the sliding shaft sleeve penetrates through the first round hole in a clearance fit manner, the upper end of the sliding shaft sleeve is fixedly connected with the lower end face of the window shielding block, and the lower end of the sliding shaft sleeve is fixedly connected with the driving arm; the sliding shaft sleeve is a copper thin-wall bearing bush with a flange.
Preferably, the window shielding block is a cylindrical structure with a rectangular emergent neutron channel in the middle; the upper shielding block and the lower shielding block are in mirror image structures and are in cylinder structures surrounded by a convex arc side wall, a concave arc side wall, an inner arc side wall, an outer arc side wall, an upper flat wall and a lower flat wall; blind holes matched with the positioning cylinders are formed in the lower flat walls of the upper shielding block and the lower shielding block; the positioning cylinder on the bearing platform is inserted into a blind hole on the upper shielding block or the lower shielding block, so that the upper shielding block and the lower shielding block are fixed on the upper end surface of the Z-shaped cushion block or the middle cushion block, meanwhile, the convex arc side wall of one upper shielding block is in concentric clearance fit with the concave arc side wall of the upper shielding block adjacent to the convex arc side wall, and the concave arc of one lower shielding block is in concentric clearance fit with the convex arc of the lower shielding block on the right side adjacent to the concave arc side wall; the side wall of the window shielding block is in concentric clearance fit with the concave arc side walls of the upper shielding block and the lower shielding block.
Preferably, the blind holes on the upper shielding block and the lower shielding block are concentric with the convex arc side walls on the upper shielding block and the lower shielding block, and the inner arc side walls and the outer arc side walls on the upper shielding block and the lower shielding block are concentric; the center distances of the convex arc side walls and the concave arc side walls on the upper shielding block and the lower shielding block are both L; the radius of the concave arc side wall on the upper shielding block and the radius of the concave arc side wall on the lower shielding block are both 1mm larger than that of the convex arc side wall on the upper shielding block.
Preferably, two opposite side walls of the middle cushion block are convex arc side walls, two second round holes matched with the bearing bush are formed in the middle cushion block, and each second round hole is concentric with the convex arc side wall on the corresponding side of the second round hole;
the high platform and the low platform of the Z-shaped cushion block are respectively provided with a third round hole matched with the bearing bush, and the central distance of the two third round holes in the horizontal plane is L; a concave arc side wall and a convex arc side wall are formed on the high platform, the central distance between the concave arc side wall and the convex arc side wall on the high platform is L, and the concave arc side wall on the high platform is concentric with the third circular hole on the low platform; the radius of the concave arc side wall on the high platform is 1mm larger than that of the convex arc side wall on the high platform; and the radius of the concave arc side wall on the Z-shaped cushion block is 1mm larger than that of the convex arc side wall on the middle cushion block.
The utility model adopts the above technical scheme, it has following advantage:
1. the utility model discloses a drive revolving stage subassembly drives the chain car and moves on the guide rail, makes window shielding block move around the axis of main shield room to change emergent neutron passageway on the window shielding block and the intercommunication position of neutron emergent window, thereby realize the continuous change of monochromator takeoff angle, both satisfied the neutron spectrometer to the continuous change requirement of incident neutron energy, satisfied the requirement that reduces the experiment background again; the takeoff angle range of the neutron spectrometer is effectively improved, and particularly the range of high-energy neutrons can be effectively improved; make the utility model is particularly suitable for a build the neutron spectrometer at the non-terminal gap position of neutron pipe.
2. The utility model discloses a relative rotation and the vice distance compensation of straight guide rail in the round hole of sliding shaft cover on the middle cushion, realize in the angle range of taking off, monochromator axle is aimed at all the time to the outgoing neutron passageway on the window shielding piece.
3. The utility model discloses a rolling friction between two sets of bearings on the bearing platform to realizing chain car and guide rail can the greatly reduced shield chain car subassembly frictional force in the motion process to make driving moment greatly reduced.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention;
fig. 2 is a schematic sectional top view of the present invention;
FIG. 3 is a schematic structural view of the main shielding chamber of the present invention;
fig. 4 is a schematic structural view of the guide rail of the present invention;
fig. 5 is a schematic structural view of the shielded chain car assembly of the present invention, fig. 5(a) is a front view of the shielded chain car assembly of the present invention, and fig. 5(b) is a sectional top view a-a of the shielded chain car assembly of the present invention;
FIG. 6 is a schematic structural view of the Z-shaped cushion block of the present invention;
fig. 7 is a schematic structural view of the middle cushion block of the present invention;
FIG. 8 is a schematic view of the connection structure of the bearing platform, the positioning cylinder and the bearing bush of the present invention;
fig. 9 is a schematic structural view of the bearing platform of the present invention;
fig. 10(a) is a front view at a take-off angle of 70 ° of the present invention; FIG. 10(B) is a sectional top view B-B of FIG. 10 (a);
fig. 11(a) is a front view at a take-off angle of 36 ° of the present invention; FIG. 11(b) is a top view of the section C-C in FIG. 11 (a).
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and examples. It is to be understood, however, that the drawings are provided for a better understanding of the invention and that they are not to be interpreted as limiting the invention.
As shown in fig. 1-3, the embodiment of the utility model provides a neutron monochromator shield assembly is particularly useful for putting up on the neutron spectrometer at bunch middle part, and it includes:
the device comprises a main shielding chamber 1, a neutron guide tube inlet 10 and a neutron emergent window 11, wherein the main shielding chamber 1 is of a hollow shell structure;
a rail assembly 2 disposed outside the main shield room 1 in a coaxial manner, on which a rail 20 extending from an upstream side to a downstream side of the main shield room 1 is formed;
the shielding chain car assembly 3 comprises a chain car 30 arranged on the guide rail 20 in a sliding mode, a window shielding block 31 arranged in the middle of the chain car 30, and N +1 upper shielding blocks 32 and M +1 lower shielding blocks 33 arranged on the chain car 30 on two sides of the window shielding block 31; the window shielding block 31 is provided with an emergent neutron channel 310 communicated with the neutron emergent window 11; the window shielding block 31 is in clearance fit with the upper shielding block 32, the lower shielding block 33, the upper shielding block 32 and the lower shielding block 33;
the driving turntable assembly 4 comprises a driving turntable 40, a straight guide rail pair 41 and a driving arm 42; the driving turntable 40 is arranged below the main shielding chamber 1 in a coaxial manner, a guide rail of the straight guide rail pair 41 is horizontally fixed on the driving turntable 40, and the driving arm 42 is vertically fixed on a sliding block of the straight guide rail pair 41; the drive arm 42 is fixedly connected to the window shield block 31 of the shield chain car assembly 3 so that the shield chain car assembly 3 is interlocked with the drive turret assembly 4.
In the above embodiment, preferably, as shown in fig. 3, the cross section of the main shielding chamber 1 is a circular arc spliced rectangle, the front side wall of the main shielding chamber 1 is a circular arc structure, a neutron exit window 11 is opened on the front side wall of the main shielding chamber 1 along the circular arc direction, and a neutron conduit inlet 10 and a neutron conduit outlet 12 are respectively arranged on two side walls of the main shielding chamber 1 adjacent to the front side wall.
In the above embodiment, preferably, as shown in fig. 4, the guide rail assembly 2 further includes a guide rail support frame 21, and the guide rail 20 includes an intermediate guide rail 201 disposed on the guide rail support frame 21, and an upstream straight guide rail 202 and a downstream straight guide rail 203 disposed on the guide rail support frame 21 and distributed on two sides of the intermediate guide rail 201; the middle guide rail 201 and the main shielding chamber 1 are coaxially distributed and wrapped at the front side of the main shielding chamber, and the upstream straight guide rail 202 and the downstream straight guide rail 203 are in smooth transition connection with the middle guide rail 201; the top surface of the guide rail 20 is formed with a groove 22, the groove 22 includes an upstream groove 220, a middle groove 221 and a downstream groove 222 which are formed on the middle part of the top surface of the upstream straight guide rail 202, the middle guide rail 201 and the downstream straight guide rail 203 and smoothly connected in sequence, and the chain car 30 is slidably arranged in the groove 22.
In the above embodiment, the turntable 40 is preferably a mechanical transmission mechanism with a rotation function composed of a large gear and a small gear driven by a motor, and is used for driving the driving arm 42 to rotate so as to drive the shielding chain car assembly 3 to move along the guide rail 20.
In the above embodiment, it is preferable that the driving arm 42 has an inverted L-shaped structure, and the extension 421 of the top of the driving arm 42 is fixedly connected to the window shielding block 31 of the shielding chain car assembly 3.
In the above embodiment, preferably, as shown in fig. 5a, 5b and 6, the chain car 30 includes M + N Z-shaped spacers 301, a middle spacer 302, M + N +2 bearing platforms 303, M + N +2 positioning cylinders 304, M + N +2 bearing shoes 305, an upstream spacer 306 and a downstream spacer 307; each Z-shaped spacer block 301 is formed with a high platform 3011 and a low platform 3012, each bearing platform 303 is fixedly provided with a positioning cylinder 304, and a bearing block 305 is sleeved on the positioning cylinder 304 in a clearance fit manner.
N +1 bearing platforms 303 are arranged at the upstream section of the guide rail 20 at intervals in a sliding manner, N Z-shaped cushion blocks 301 are placed on the N +1 bearing platforms 303, from the upstream end of the guide rail 20, the upstream cushion blocks 306 are sleeved on the 1 st bearing platform 303 after being sleeved on the 1 st bearing block 305, the high platforms 3011 of the 1 st Z-shaped cushion blocks 301 are sleeved on the 1 st bearing block 305 and then are overlapped on the upper end surface of the upstream cushion block 306, the low platforms 3012 of the 1 st Z-shaped cushion blocks 301 are sleeved on the 2 nd bearing block 305 and then are overlapped on the 1 st bearing platform 303 and the 2 nd bearing platform 303, the high platforms 3011 of the ith Z-shaped cushion blocks 301 are sleeved on the ith bearing block 305 and then are pressed on the upper end surfaces of the low platforms 3012 of the i-1 th Z-shaped cushion blocks 301, the low platforms 3012 of the ith Z-shaped cushion blocks 301 are sleeved on the i +1 th bearing platform 303 and then are overlapped on the i +1 th bearing platform 303 and the i +1 st bearing platform 303, i 2 bearing platform 303, 2. N;
arranging M +1 bearing platforms 303 at intervals in a sliding manner at the downstream section of the guide rail 20, placing M Z-shaped cushion blocks 301 on the M +1 bearing platforms 303, from the downstream end of the guide rail 20, sleeving the downstream cushion block 307 on the 1 st bearing pad 305 and then lapping on the 1 st bearing platform 303, sleeving the 1 st bearing pad 305 and then lapping on the downstream cushion block 307, sleeving the 2 nd bearing pad 305 and then lapping on the 2 nd bearing platform 303 and the 1 st bearing platform 303, sleeving the ith bearing pad 305 and then pressing on the upper end surface of the low platform 3012 of the i-1 th Z-shaped cushion block 301, sleeving the i +1 st bearing pad 305 and then lapping on the i +1 st bearing platform 303 and the i-th bearing platform 303, wherein the i +1 st bearing platform 303, M +1 st bearing pads 301 are placed on the M +1 st bearing platforms 303;
one end of the middle cushion block 302 is sleeved on the upper end surface of the lower platform 3012 of the Mth Z-shaped cushion block 301 after the M +1 th bearing bush 305 from the downstream end, and the other end of the middle cushion block 302 is sleeved on the upper end surface of the lower platform 3012 of the Nth Z-shaped cushion block 301 after the N +1 th bearing bush 305 from the upstream end;
the window shielding block 31 is positioned above the middle part of the middle cushion block 302 and is fixedly connected with the driving arm 42, and the N +1 upper shielding blocks 32 are correspondingly connected with the positioning cylinders 304 on the N +1 bearing platforms 303 one by one; the M +1 lower shielding blocks 33 are connected with the positioning cylinders 304 on the M +1 bearing platforms 303 in a one-to-one correspondence manner.
In the above embodiment, preferably, as shown in fig. 8 and 9, each bearing platform 303 is provided with a bearing pair a with a rotation axis vertical to the ground and a bearing pair b with a rotation axis parallel to the ground; the bearing pair a on each bearing platform 303 is inserted into the groove 22 on the guide rail 20 in a clearance fit manner, and plays a guiding role when the shielding chain car assembly 3 moves; the bearing pair b on each bearing platform 303 is tangent to the upper end face of the guide rail 20 and plays a bearing role when the shielding chain car assembly 3 moves.
In the above embodiment, it is preferable that the width of the groove 22 of the guide rail 20 is the same as the diameter of the bearing pair a on the bearing platform 303, and the depth of the groove 22 is greater than the height of the bearing pair a on the bearing platform 303.
In the above embodiment, it is preferable that the window shielding block 31 is a cylindrical structure with a rectangular outgoing neutron channel 310 in the middle; the upper shielding block 32 and the lower shielding block 33 are mirror-image structures, and both adopt a cylindrical structure formed by enclosing a convex arc side wall, a concave arc side wall, an inner arc side wall, an outer arc side wall, an upper flat wall and a lower flat wall; blind holes matched with the positioning cylinders 304 are formed in the lower flat walls of the upper shielding block 32 and the lower shielding block 33; during installation, the positioning cylinder 304 on the bearing platform 303 is inserted into a blind hole on the upper shielding block 32 or the lower shielding block 33, so that the upper shielding block 32 and the lower shielding block 33 are fixed on the upper end surface of the Z-shaped cushion block 301 or the middle cushion block 302, meanwhile, the convex arc side wall of one upper shielding block 32 is in concentric clearance fit with the concave arc side wall of the upper shielding block 32 adjacent to the convex arc side wall, and the concave arc side wall of one lower shielding block 33 is in concentric clearance fit with the convex arc side wall of the lower shielding block 33 adjacent to the concave arc side wall on the right side; the side wall of the window shielding block 31 is in concentric clearance fit with the concave arc side walls of the upper shielding block 32 and the lower shielding block 33.
In the above embodiment, preferably, the blind holes on the upper shielding block 32 and the lower shielding block 33 are concentric with the convex arc sidewall thereon, and the inner arc sidewall and the outer arc sidewall on the upper shielding block 32 and the lower shielding block 33 are concentric; the center distances of the convex arc side walls and the concave arc side walls on the upper shielding block 32 and the lower shielding block 33 are both L; the radius of the concave arc side wall on each of the upper shield block 32 and the lower shield block 33 is 1mm larger than that of the convex arc side wall thereon.
In the above embodiment, as shown in fig. 7, preferably, the driving arm 42 is fixedly connected to the window shielding block 31 through the sliding shaft sleeve 5, the center position of the middle pad block 302 is provided with the first round hole 3021, the sliding shaft sleeve 5 is inserted into the first round hole 3021 in a clearance fit manner, the upper end of the sliding shaft sleeve 5 is fixedly connected to the lower end surface of the window shielding block 31, and the lower end of the sliding shaft sleeve 5 is fixedly connected to the driving arm 42. The sliding bush 5 can be a copper thin-walled bush with a flange.
In the above embodiment, preferably, the two opposite side walls 3022 of the middle pad block 302 are convex arc side walls, and two second circular holes 3023 matched with the bearing pads 305 are formed in the middle pad block 302, and each second circular hole 3023 is concentric with the convex arc side wall on the corresponding side.
In the above embodiment, preferably, as shown in fig. 6, the high platform 3011 and the low platform 3012 of the Z-shaped pad block 301 are respectively provided with a third circular hole c matched with the bearing bush 305, and the central distance between the two third circular holes c in the horizontal plane is ZL; a concave arc side wall and a convex arc side wall are formed on the high platform 3011, the central distance between the concave arc side wall and the convex arc side wall is ZL, and the concave arc side wall is concentric with a third circular hole c on the low platform 3012; the radius of the concave arc side wall is 1mm larger than that of the convex arc side wall; the radius of the concave arc side wall on the Z-shaped cushion block 301 is 1mm larger than that of the convex arc side wall on the middle cushion block 302; the center distance of the bearing pair a of the bearing platform 303 is LL, and LL is ZL; the lower end face of the high platform 3011 of one Z-shaped cushion block 301 is matched with the upper end face of the low platform 3012 of the adjacent Z-shaped cushion block 301, so that the upper end faces of the high platforms 3011 of all the Z-shaped cushion blocks 301 are flush, the positioning cylinders 304 on the bearing platform 303 sequentially penetrate through the third round holes c on the high platform 3011 and the low platform 3012, and the bearing bushes 305 on the positioning cylinders 304 are matched with the round holes c, so that the two adjacent Z-shaped cushion blocks 301 are connected together.
The adjustment process of the outgoing neutron channel will be described below by the specific operation of a neutron monochromator shielding device.
Wherein, the monochromator is arranged in a coaxial manner with the main shielding chamber 1, N is 9, M is 10, LL is L is ZL is 70mm, the central radius of the middle groove 221 of the guide rail 20 is 820mm, in fig. 10(b) and 11(b), i is the 1 st upper shielding block, ii is the 2 nd upper shielding block, iii is the 3 rd upper shielding block, iv is the 4 th upper shielding block, v is the 5 th upper shielding block, vi is the 6 th upper shielding block, 389 is the 7 th upper shielding block, viii is the 8 th upper shielding block, ix is the 9 th upper shielding block, x is the 10 th upper shielding block, viii is the 1 st lower shielding block, ② is the 2 nd lower shielding block, ③ is the 3 rd lower shielding block, ④ is the 4 th lower shielding block, ⑤ is the 5 th lower shielding block, 366 th lower shielding block, 3578 is the 2 th lower shielding block, 368 th lower shielding block is the 368 th lower shielding block, 368 th lower shielding block is the 358 th lower shielding block,
is the 11 th lower shielding block;
(1) the takeoff angle is adjusted from 70 degrees to 36 degrees:
as shown in fig. 10(a), (b), the driving turntable 40 rotates clockwise in plan view, directly drives the guide rail of the straight guide rail pair 41 to rotate, thereby driving the slider of the straight guide rail pair 41 to rotate, and further driving the driving arm 42, the sliding shaft sleeve 5 and the window shielding block 31 to rotate together around the monochromator axis, the rotation of the window shielding block 31 will push the adjacent 11 th lower shielding block 33 and the fixed middle cushion block 302 to move, the middle cushion block 302 will push the 11 th positioning cylinder 304 and the 11 th bearing platform 303 to move together through the 11 th bearing bush 305, at the same time, the 11 th lower shielding block 33 will push the adjacent 10 th lower shielding block 33 and the fixed 12 th Z-shaped block 301 to move together, the 12 th Z-shaped block 301 will push the 12 th positioning cylinder 304 and the 12 th bearing platform 303 to move together through the 12 th bearing bush 305, and so on the guide rail 20, so that the shielding chain car assembly 3 moves on the guide rail 20 under the guiding effect of the bearing pair a of the bearing platform 303 In the process of adjusting the takeoff angle from 70 degrees to 44.17 degrees, the window shielding block 31 does not rotate relative to the middle cushion block 302, the distance between the window shielding block 31 and the monochromator shaft is not changed, the emergent neutron channel 310 of the window shielding block 31 always aligns with the monochromator shaft in the whole motion process until the takeoff angle is less than 44.17 degrees, the 11 th bearing platform 303 moves to the transition section between the middle groove 221 and the downstream groove 222 of the guide rail 20, the window shielding block 31 generates relative rotation with the middle cushion block 302 through the sliding shaft sleeve 5 to ensure that the emergent neutron channel 310 of the window shielding block 31 always aligns with the monochromator shaft, meanwhile, the window shielding block 31 also moves relative to the monochromator shaft to increase the distance between the two, the increased distance is compensated by the movement of the sliding block of the straight guide rail pair 41 relative to the guide rail, when the takeoff angle reaches 36 degrees, the moving distance of the sliding block of the straight guide rail pair 41 relative to the guide rail is 39.88mm, the turntable 40 is stopped as shown in fig. 11(a) and (b).
(2) The takeoff angle is adjusted from 35 degrees to 70 degrees:
as shown in fig. 11(a), (b), the turntable 40 rotates counterclockwise in a top view to directly drive the guide rail of the straight guide rail pair 41 to rotate, so as to drive the slider of the straight guide rail pair 41 to rotate, and further drive the driving arm 42, the sliding shaft sleeve 5 and the window shielding block 31 to rotate together around the monochromator axis, the rotation of the window shielding block 31 will push the adjacent 10 th upper shielding block 32 and the fixed middle cushion block 302 to move, the middle cushion block 302 will push the 10 th positioning cylinder 304 and the 10 th bearing platform 303 to move together through the 10 th bearing bush 305, at the same time, the 10 th upper shielding block 32 will push the adjacent 9 th upper shielding block 32 and the fixed 9 th Z-shaped cushion block 301 to move together, the 9 th Z-shaped cushion block 301 will push the 9 th positioning cylinder 304 and the 9 th bearing platform 303 to move together through the 9 th bearing bush 305, and so on, so that the shielding chain car assembly 3 moves on the guide rail 20 under the guiding effect of the bearing pair a of the bearing platform 303 In the process, the window shielding block 31 and the middle cushion block 302 rotate relatively through the sliding shaft sleeve 5 to ensure that the emergent neutron channel 310 of the window shielding block 31 is always aligned with the monochromator shaft, the window shielding block 31 moves relative to the monochromator shaft to gradually reduce the distance between the window shielding block 31 and the monochromator shaft, the reduced distance is compensated by the movement of the sliding block of the straight guide rail pair 41 relative to the guide rail, the rotary table 40 continues to rotate counterclockwise in the overlooking direction, the takeoff angle exceeds 44.17 degrees, and the window shielding block 31 and the middle cushion block 302 do not rotate relatively, the outgoing neutron channel 310 of the window shielding block 31 is always aligned with the monochromator axis, and after the takeoff angle reaches 70 °, the moving distance of the slide block of the straight guide rail pair 41 relative to the guide rail is-39.88 mm, and the turntable 40 stops, as shown in fig. 10(a) and (b).
The present invention has been described only with reference to the above embodiments, and the structure, arrangement position and connection of the components may be changed. On the basis of the technical scheme of the utility model, the all sides according to the utility model discloses the principle is all not excluded to the improvement that individual part goes on or the transform of equivalence the utility model discloses a protection scope is outside.
Claims (10)
1. A neutron monochromator shielding device, comprising:
the neutron shielding device comprises a main shielding chamber (1) which is of a hollow shell structure, wherein a neutron guide pipe inlet (10) and a neutron emergent window (11) are formed in the main shielding chamber (1);
a rail assembly (2) disposed on a front side thereof coaxially with the main shielded room (1), the rail assembly (2) having a rail (20) formed thereon extending from an upstream side to a downstream side of the main shielded room (1);
the shielding chain car assembly (3) comprises a chain car (30) arranged on the guide rail (20) in a sliding mode, a window shielding block (31) arranged in the middle of the chain car (30), and N +1 upper shielding blocks (32) and M +1 lower shielding blocks (33) arranged on the chain car (30) on two sides of the window shielding block (31); an emergent neutron channel (310) communicated with the neutron emergent window (11) is arranged on the window shielding block (31); the window shielding block (31) is in clearance fit with the upper shielding block (32), the lower shielding block (33), the upper shielding block (32) and the lower shielding block (33);
the driving turntable assembly (4) comprises a driving turntable (40), a straight guide rail pair (41) and a driving arm (42); the driving rotary table (40) is arranged below the main shielding chamber (1) in a coaxial mode, a guide rail of the straight guide rail pair (41) is horizontally fixed on the driving rotary table (40), and the driving arm (42) is vertically fixed on a sliding block of the straight guide rail pair (41); the driving arm (42) is fixedly connected with a window shielding block (31) of the shielding chain car assembly (3) so that the shielding chain car assembly (3) is linked with the driving turntable assembly (4).
2. The neutron monochromator shield of claim 1, wherein: the cross section of the main shielding chamber (1) is in a circular arc splicing rectangle, the front side wall of the main shielding chamber (1) is in a circular arc structure, the neutron exit window (11) is formed in the front side wall of the main shielding chamber (1) along the circular arc direction of the front side wall, and a neutron guide pipe inlet (10) and a neutron guide pipe outlet (12) are respectively formed in two side walls of the main shielding chamber (1) adjacent to the front side wall.
3. The neutron monochromator shield of claim 1, wherein: the guide rail assembly (2) further comprises a guide rail support frame (21), the guide rail (20) comprises a middle guide rail (201) arranged on the guide rail support frame (21), and an upstream straight guide rail (202) and a downstream straight guide rail (203) which are arranged on the guide rail support frame (21) and distributed on two sides of the middle guide rail (201); the middle guide rail (201) and the main shielding chamber (1) are coaxially distributed and wrapped on the front side of the main shielding chamber, and the upstream straight guide rail (202) and the downstream straight guide rail (203) are in smooth transition connection with the middle guide rail (201); the top surface of guide rail (20) is formed with recess (22), recess (22) including form in the top surface middle part of straight guide rail (202), middle guide rail (201) of upper reaches and straight guide rail (203) of low reaches and in proper order smooth transition connection upper reaches recess (220), middle recess (221) and low reaches recess (222), chain car (30) slide to be set up in recess (22).
4. The neutron monochromator shield of claim 1, wherein: the driving turntable (40) is a mechanical transmission mechanism which consists of a large gear and a small gear driven by a motor and has a rotating function, and is used for driving the driving arm (42) to rotate so as to drive the shielding chain car assembly (3) to move along the guide rail (20); the driving arm (42) is of an inverted L-shaped structure, and an extension section (421) at the top of the driving arm (42) is fixedly connected with the window shielding block (31) of the shielding chain car assembly (3).
5. The neutron monochromator shielding device of any of claims 1 to 4, wherein: the chain car (30) comprises M + N Z-shaped cushion blocks (301), a middle cushion block (302), M + N +2 bearing platforms (303), M + N +2 positioning cylinders (304), M + N +2 bearing bushes (305), an upstream cushion block (306) and a downstream cushion block (307); each Z-shaped cushion block (301) is provided with a high platform (3011) and a low platform (3012), each bearing platform (303) is fixedly provided with one positioning cylinder (304), and a bearing bush (305) is sleeved on one positioning cylinder (304) in a clearance fit manner;
n +1 bearing platforms (303) are arranged on the upstream section of the guide rail (20) in a sliding mode at intervals, and N Z-shaped cushion blocks (301) are placed on the N +1 bearing platforms (303); from the upstream end of the guide rail (20), the upstream cushion block (306) is sleeved on the 1 st bearing bush (305) and then lapped on the 1 st bearing platform (303), the high platform (3011) of the 1 st Z-shaped cushion block (301) is sleeved on the 1 st bearing bush (305) and then lapped on the upper end surface of the upstream cushion block (306), the low platform (3012) of the 1 st Z-shaped cushion block (301) is sleeved on the 2 nd bearing bush (305) and then lapped between the 1 st bearing platform (303) and the 2 nd bearing platform (303), the high platform (3011) of the ith Z-shaped cushion block (301) is sleeved on the ith bearing bush (305) and then pressed on the upper end surface of the low platform (3012) of the i-1Z-shaped cushion block (301), the low platform (3012) of the ith Z-shaped cushion block (301) is sleeved on the i +1 th bearing bush (305) and then lapped on the i +1 st bearing platform (303) and the bearing platform (303), n, · 2;
m +1 bearing platforms (303) are arranged at the downstream section of the guide rail (20) in a sliding mode at intervals, M + 1Z-shaped cushion blocks (301) are placed on the M +1 bearing platforms (303), from the downstream end of the guide rail (20), the downstream cushion block (307) is sleeved on the 1 st bearing bush (305) and then lapped on the 1 st bearing platform (303), the 1 st high platform (3011) of the Z-shaped cushion block (301) is sleeved on the 1 st bearing bush (305) and then lapped on the downstream cushion block (307), the 1 st low platform (3012) of the Z-shaped cushion block (301) is sleeved on the 2 nd bearing bush (305) and then lapped between the 2 nd bearing platform (303) and the 1 st bearing platform (303), the ith high platform (3011) of the Z-shaped cushion block (301) is sleeved on the ith bearing bush (305) and then pressed on the upper end face of the i-1 th low platform (3012) of the Z-shaped cushion block (301), a lower platform (3012) of an ith Z-shaped cushion block (301) is sleeved on an ith +1 bearing bush (305) and then pressed between the ith +1 bearing platform (303) and the ith bearing platform (303), wherein i is 1.
One end of the middle cushion block (302) is sleeved on the upper end surface of the lower platform (3012) of the Mth Z-shaped cushion block (301) after the M +1 th bearing bush (305) from the downstream end, and the other end of the middle cushion block (302) is sleeved on the upper end surface of the lower platform (3012) of the Nth Z-shaped cushion block (301) after the N +1 th bearing bush (305) from the upstream end;
the window shielding block (31) is positioned above the middle part of the middle cushion block (302) and is fixedly connected with the driving arm (42), and the N +1 upper shielding blocks (32) are correspondingly connected with the N +1 positioning cylinders (304) on the bearing platform (303) one by one; the M +1 lower shielding blocks (33) are correspondingly connected with the M +1 positioning cylinders (304) on the bearing platform (303) one by one.
6. The neutron monochromator shield of claim 5, wherein: each bearing platform (303) is provided with a first bearing pair (a) with a rotation axis vertical to the ground and a second bearing pair (b) with a rotation axis parallel to the ground, and the center distance of the first bearing pair (a) of the bearing platform (303) is L; a first bearing pair (a) on each bearing platform (303) is embedded in a clearance fit manner with a groove (22) on the guide rail (20); a second bearing pair (b) on each bearing platform (303) is tangent to the upper end surface of the guide rail (20);
the width of the groove (22) on the guide rail (20) is the same as the diameter of the first bearing pair (a) on the bearing platform (303), and the depth of the groove (22) is larger than the height of the first bearing pair (a) on the bearing platform (303).
7. The neutron monochromator shield of claim 5, wherein: the driving arm (42) is fixedly connected with the window shielding block (31) through a sliding shaft sleeve (5), wherein a first round hole (3021) is formed in the center of the middle cushion block (302), the sliding shaft sleeve (5) penetrates through the first round hole (3021) in a clearance fit manner, the upper end of the sliding shaft sleeve (5) is fixedly connected with the lower end face of the window shielding block (31), and the lower end of the sliding shaft sleeve (5) is fixedly connected with the driving arm (42); the sliding shaft sleeve (5) is a copper thin-wall bearing bush with a flange.
8. The neutron monochromator shield of claim 5, wherein: the window shielding block (31) is of a cylindrical structure with a rectangular emergent neutron channel (310) in the middle; the upper shielding block (32) and the lower shielding block (33) are of mirror image structures and are of cylinder structures surrounded by a convex arc side wall, a concave arc side wall, an inner arc side wall, an outer arc side wall, an upper flat wall and a lower flat wall; blind holes matched with the positioning cylinders (304) are formed in the lower flat walls of the upper shielding block (32) and the lower shielding block (33); the positioning cylinder (304) on the bearing platform (303) is inserted into a blind hole on the upper shielding block (32) or the lower shielding block (33), so that the upper shielding block (32) and the lower shielding block (33) are fixed on the upper end surface of the Z-shaped cushion block (301) or the middle cushion block (302), meanwhile, the convex arc side wall of one upper shielding block (32) is in concentric clearance fit with the concave arc side wall of the upper shielding block (32) adjacent to the upper shielding block, and the concave arc of one lower shielding block (33) is in concentric clearance fit with the convex arc of the lower shielding block (33) on the right side adjacent to the lower shielding block; the side wall of the window shielding block (31) is in concentric clearance fit with the concave arc side walls of the upper shielding block (32) and the lower shielding block (33).
9. The neutron monochromator shield of claim 8, wherein: blind holes in the upper shielding block (32) and the lower shielding block (33) are concentric with convex arc side walls on the upper shielding block, and inner arc side walls and outer arc side walls on the upper shielding block (32) and the lower shielding block (33) are concentric; the distances between the centers of the convex arc side wall and the concave arc side wall of the upper shielding block (32) and the lower shielding block (33) are both L; the radiuses of the concave arc side walls on the upper shielding block (32) and the lower shielding block (33) are 1mm larger than the radiuses of the convex arc side walls on the upper shielding block and the lower shielding block.
10. The neutron monochromator shield of claim 5, wherein: the two opposite side walls (3022) of the middle cushion block (302) are convex arc side walls, two second round holes (3023) matched with the bearing bushes (305) are formed in the middle cushion block (302), and each second round hole (3023) is concentric with the convex arc side wall on the corresponding side;
the high platform (3011) and the low platform (3012) of the Z-shaped cushion block (301) are respectively provided with a third round hole (c) matched with the bearing bush (305), and the central distance of the two third round holes (c) in the horizontal plane is L; a concave arc side wall and a convex arc side wall are formed on the high platform (3011), the central distance between the concave arc side wall and the convex arc side wall on the high platform (3011) is L, and the concave arc side wall on the high platform (3011) is concentric with a third round hole (c) on the low platform (3012); the radius of the concave arc side wall on the elevated table (3011) is 1mm larger than that of the convex arc side wall on the elevated table; the radius of the concave arc side wall on the Z-shaped cushion block (301) is 1mm larger than that of the convex arc side wall on the middle cushion block (302).
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110085341A (en) * | 2019-05-16 | 2019-08-02 | 中国人民大学 | A kind of neutron monochromator shielding device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110085341A (en) * | 2019-05-16 | 2019-08-02 | 中国人民大学 | A kind of neutron monochromator shielding device |
| CN110085341B (en) * | 2019-05-16 | 2023-12-15 | 中国人民大学 | Neutron monochromator shielding device |
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