CN111208157A - Beam shielding system applied to multi-station switching second neutron beam switch - Google Patents
Beam shielding system applied to multi-station switching second neutron beam switch Download PDFInfo
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Abstract
The invention relates to the technical field of neutron beam switches, in particular to a beam shielding system applied to a multi-station switching second neutron beam switch, wherein the beam shielding system, a shielding support system and a switch motion system form a high-precision second neutron beam switch capable of realizing multi-station switching; the beam shielding system comprises a beam stopper upper component connected with the top supporting plate, a beam stopper main component connected with the switch motion system and a beam stopper lower component connected with the base station, and the beam stopper main component realizes the switching of different working modes through horizontal motion; more specifically, the position switching of the guide pipe, the beam stop main assembly and the collimator can be realized in sequence to meet different working conditions and experimental requirements; in conclusion, the technical scheme of the invention has the advantages of simple operation, short movement time, high repeated positioning precision, capability of quickly and conveniently realizing station switching and beam on-off and the like.
Description
Technical Field
The invention relates to the technical field of neutron beam switches, in particular to a beam shielding system applied to a multi-station switching second neutron beam switch.
Background
The neutron spectrometer is mainly used for researching the structure and the property of various substances, and the neutron spectrometers built around the world at present mainly comprise two types, wherein the first type is called a neutron spallation source spectrometer, and a neutron spallation source is used for generating neutrons based on the bombardment of accelerator accelerated protons on a target; the second type is known as neutron reactor spectroscopy, where the neutron reactor is based on the fission of uranium to generate neutrons.
The neutron beam switch is used for switching on and off neutron beam current in the neutron spectrometer, and the neutron beam current is transmitted to a sample through neutron optical components such as a neutron guide tube in a conduction state. For neutron spallation source spectrometers, each spectrometer needs to be provided with a beam switch, also called a main beam switch, in a spallation target station, because the main switch in the target station is bulky in size and the time for opening and closing is relatively long, a second neutron beam switch is built on a neutron beam in a spectrometer hall for partial neutron spallation source spectrometers, such as a magnetic reflection spectrometer BL4A of a neutron spallation source (SNS) in the united states and a liquid reflection spectrometer BL4B, and the second neutron beam switch is generally set to be light and convenient to control, so that the operation time is short, and in addition, because the second beam switch is located on a neutron beam transmission line, the design accuracy needs to be high.
Some spectrometers are based on experimental requirements, need to build the device that can realize that three or more than three parts switch on the transmission path of bunch, for example, the pipe of two different specifications and a collimator carry out the position and switch or the pipe of three kinds of different specifications and size carries out functions such as position switch, when the beam break-make function of second neutron bunch switch and the beam transmission part integration of different specifications are together, then need to build the second neutron bunch switch that has multistation switching function, when this equipment normally works, not only need to switch in order to ensure the neutron transmission part transmission neutron beam of different specifications through the part, thereby guarantee the neutron flux of sample position, still need when personnel get into to the radiating chamber, cut off the neutron beam reliably in order to guarantee personnel's safety. In addition, the repeated positioning precision of the neutron guide tube or the collimator in the second neutron beam line switch in the on state needs to be the same as that of the neutron guide tube, and the collimation installation precision of the neutron guide tube or the collimator needs to be higher and needs to reach 0.05 mm. For example, chinese patent (publication No. CN104134471A) discloses a neutron channel gate device, which drives a neutron channel to move up and down by a cylinder, and utilizes a limit switch to perform signal feedback to open or close the neutron channel, but because the neutron channel is driven by air pressure, the limit switch performs signal feedback, so that the repeated positioning accuracy when the neutron channel is opened is low; the Chinese patent (publication No. CN103454293A) discloses a neutron beam switch and a collimation installation method, and the collimation installation of the neutron beam switch is realized by the stepped matching of a concave table and a convex table.
Disclosure of Invention
The invention mainly aims to solve the technical problems that in the prior art, the positioning and repeated positioning precision of a neutron beam line switch is low and multi-station switching cannot be realized, and provides a beam shielding system which, a shielding support system and a switch motion system form a high-precision second neutron beam line switch capable of realizing multi-station switching.
The technical scheme adopted by the invention is as follows: a beam shielding system applied to a second neutron beam switch capable of realizing multi-station switching is arranged in the second neutron beam switch capable of realizing multi-station switching, and comprises a shielding support system arranged on the periphery, a switch motion system arranged in the shielding support system and a beam shielding system which is simultaneously connected with the shielding support system and the switch motion system to realize beam shielding; the beam shielding system comprises a beam stopper upper component connected with the top supporting plate, a beam stopper main component connected with the switch motion system and a beam stopper lower component connected with the base station, and the beam stopper main component realizes the switching of different working modes through horizontal motion; when the second neutron beam switch is positioned at the first station, the guide pipe is positioned on the beam central line, and the guide pipe plays a role in transmitting the neutron beam; in the second station, the collimator is positioned on the beam central line, and the collimator plays a role in transmitting neutron beam; during the third station, beam current shield system's beam current dog main part is located the beam current central line and plays and cuts off neutron beam current and realize the shielding effect, beam current dog main part beam current dog upper portion subassembly and beam current dog lower part subassembly are equallyd divide and are piled up the connection in proper order by different material layers and form respectively.
The stop dog main assembly comprises a boron carbide block, a lead block and a carbon steel shielding block which are fixedly connected in sequence through bolts, and a shielding layer formed by connecting different materials in sequence can shield different types of ions through different materials and can also shield neutron beam current and other particles derived from the neutron beam current.
The beam stop main assembly is fixedly mounted on the surface of the workbench, the switching of three working states can be carried out along with the horizontal movement of the workbench, an elevation target seat and a horizontal target seat are arranged on the surface of the beam stop main assembly, and collimation measurement can be carried out by using collimation equipment.
When the main assembly of the beam stop block is positioned on the beam central line, the beam can be blocked to the maximum extent through the beam shielding system formed by the upper assembly of the beam stop block, the main assembly of the beam stop block and the lower assembly of the beam stop block.
The guide pipe, the beam current stop block main assembly and the collimator are all installed on the surface of the workbench and arranged in parallel, wherein the beam current stop block main assembly is located between the guide pipe and the collimator, and the guide pipe and the collimator are located on two sides of the beam current stop block main assembly.
The invention has the beneficial effects that: aiming at the technical problems that in the prior art, the neutron beam switch positioning and repeated positioning precision is low and multi-station switching cannot be realized, the invention provides a high-precision second neutron beam switch capable of realizing multi-station switching, which is formed by a beam shielding system, a shielding support system and a switch moving system, and aims at realizing the second neutron beam switch scheme which is convenient to operate, short in moving time, high in repeated positioning precision and has a multi-station switching function and a beam passing function on a spectrometer beam; the neutron beam switch is driven by a motor and fed back by an encoder system, so that high-precision positioning can be realized, the sliding block and the guide rail are in sliding friction contact, the friction coefficient between the sliding block and the guide rail is low, high load can be realized, the position after collimation installation is recorded by using an absolute encoder, the positioning precision is high, data loss cannot occur, and meanwhile, the position switching of the guide pipe, the beam stop block main assembly and the collimator pipe can be sequentially realized to meet different working conditions and experimental requirements; in conclusion, the technical scheme of the invention has the advantages of simple operation, short movement time, high repeated positioning precision, capability of quickly and conveniently realizing station switching and beam on-off and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic perspective view of a multi-station switching high-precision second neutron beam switch according to the present invention;
FIG. 2 is a schematic perspective view of the shield support system of the present invention;
FIG. 3 is a top view of the shield support system of the present invention;
FIG. 4 is a cross-sectional view taken along line A-A of FIG. 3;
FIG. 5 is a top view of the switch motion system of the present invention;
FIG. 6 is a cross-sectional view taken along line A-A of FIG. 5;
FIG. 7 is a front view of the switch movement system of the present invention;
FIG. 8 is a rear view of the switch movement system of the present invention;
FIG. 9 is a schematic perspective view of an adjustment mechanism according to the present invention;
FIG. 10 is a schematic perspective view of an auxiliary adjustment mechanism according to the present invention;
FIG. 11 is a schematic perspective view of a bottom plate connecting plate according to the present invention;
fig. 12 is a schematic perspective view of the main assembly of the beam stop of the present invention.
The reference numbers illustrate:
the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The invention provides a beam shielding system, which, together with a shielding support system 2 and a switch motion system 1, forms a high-precision second neutron beam switch capable of realizing multi-station switching.
The multi-station switching high-precision second neutron beam switch can realize three-station switching, wherein the first station conduit 16 is positioned on a beam central line, and the conduit 16 plays a role in transmitting neutron beams; in the second station, the collimator 18 is positioned on the beam central line, and the collimator 18 plays a role in transmitting neutron beam; and in the third station, the main assembly of the beam stopper is positioned on a beam central line to play a role of cutting off the neutron beam, and under the working condition of the third station, the rear end of the second neutron beam switch belongs to a radiation safe region, so that personnel can enter the rear end region of the second neutron beam to perform equipment maintenance and sample replacement operation.
Referring to fig. 1 to 12, the multi-station switching high-precision second neutron beam switch according to the embodiment of the present invention includes a shielding support system 2 disposed on the periphery, a switch motion system 1 disposed inside the shielding support system 2, and a beam shielding system connected to the shielding support system 2 and the switch motion system 1 to implement beam shielding.
Wherein shielding braced system 2 of this embodiment mainly includes inside base station 3 that is equipped with pre-buried steel sheet, 3 top sides of base station link to each other preceding shielding backup pad 10 and back shielding backup pad 4 respectively, 3 top surfaces of base station still are fixed and link to each other with right side bottom plate 12 and left side bottom plate 13, preceding shielding backup pad 10 and 4 tops of back shielding backup pad link to each other with 6 bottom surfaces of top backup pad simultaneously are fixed, and 6 top surfaces of top backup pad are fixed and link to each other with left side roof 7 and right side roof 9, preceding shielding backup pad 10 and back shielding backup pad 4 are equipped with shielding filling block 5 respectively between 6 with the top backup pad, wherein shielding filling block 5 is used for shielding the filling to the space except that the motion space, thereby make the neutron shielding beam current better when. In the present embodiment, the top support plate 6 disposed at the top, the front shielding support plate 10 disposed at the front, the rear shielding support plate 4 disposed at the rear, and the base 3 disposed at the lower portion are connected by bolts to form a rectangular frame structure with a hollow interior for accommodating the switch motion system 1 of the present embodiment, and also play a role in radiation protection.
Referring to fig. 2, 4 and 5, in the present embodiment, the beam shielding system is composed of an upper beam stopper assembly 8 disposed at the upper portion, a main beam stopper assembly 17 disposed at the middle portion, and a lower beam stopper assembly 11 disposed at the lower portion. And when the third station is in the third station, the beam shielding system is positioned on a beam central line, so that the neutron beam can be completely shielded by adaptively adjusting the beam shielding system, and a worker at the rear end of the second neutron beam switch is ensured to be below a safe dose. In structural connection, the beam stop upper assembly 8 of the present embodiment is fixed on the top surface of the top support plate 6 by screws, the beam stop lower assembly 11 is fixed on the top surface of the base 3 by screws, and the beam stop main assembly 17 is connected with the switching movement system 1 of the present embodiment and is arranged between the upper and lower positions of the beam stop upper assembly 8 and the beam stop lower assembly 11, so that the switching of different working modes is realized by adjusting the movement of the beam stop main assembly 17 in the horizontal direction.
Preferably, the beam stop main assembly 17, the beam stop upper assembly 8, and the beam stop lower assembly 11 of the present embodiment are respectively formed by connecting rectangular blocks made of different materials, and the rectangular blocks are fixedly connected with each other by bolts. Referring to fig. 12, the beam stop main assembly 17 of the present embodiment includes a boron carbide block 47, a lead block 48, and a carbon steel shielding block 49 fixedly connected in sequence by bolts, and a shielding layer formed by connecting different materials in sequence can shield different types of ions respectively by different materials, and can also shield a neutron beam and other particles derived from the neutron beam.
Referring to fig. 2, in addition, rectangular holes 101 are formed in the surfaces of the front shielding support plate 10 and the rear shielding support plate 4 of the embodiment, and the centers of the rectangular holes 101 are overlapped with the beam centers, so that the neutron beam transmission is not affected in the working states of the first station and the second station, and the neutron beam is shielded to the maximum extent in the state of the third station.
Referring to fig. 1 to 12, a switch motion system 1 of the present embodiment includes a power transmission system, a control system, a base and support system, a conduit and adjustment system, a collimator and adjustment system, and a beam stop main assembly.
Referring to fig. 5 to 8, the power transmission system of the present embodiment includes a motor 21 disposed at one end, the motor 21 is mounted on the top surface of a bottom plate 23 through a mounting base, a power output end of the motor 21 is connected with one end of a lead screw 15 through a coupling 20, the coaxiality requirement between a transmission shaft of the motor 21 and the lead screw 15 can be reduced by disposing the coupling 20 to reduce the mounting difficulty, two ends of the lead screw 15 are respectively mounted and positioned through two axially disposed support assemblies 19, and the support assemblies 19 are fixed on the surface of the bottom plate 23 through screws. The ball nut 26 is connected with the screw rod 15 in a thread fit rolling manner, and the ball nut 26 is fixedly connected with the workbench through a nut seat, so that the motor 21 can rotate to drive the coupling 20 to drive the screw rod 15 to rotate correspondingly, the screw rod 15 and the ball nut 26 are installed and connected in a thread pair fit manner and are driven to rotate, under the driving action of the thread pair, the rotating motion of the screw rod 15 is converted into axial linear motion of the ball nut 26 relative to the screw rod 15, correspondingly, the ball nut 26 drives the nut seat to move, namely, the workbench 50 is driven to move horizontally, therefore, the horizontal movement of advancing or retreating of the workbench can be realized by controlling the positive rotation or the reverse rotation of the motor 21, and the workbench drives the beam stop main assembly 17 to switch stations.
Referring to fig. 8, the control system of the present embodiment includes an encoding system and a mechanical limit switch, wherein the encoding system is composed of a reading head 37 and a grating scale 38, and the grating scale 38 is installed on the side surface of the bottom plate 23. Referring to fig. 5, the reading head 37 is mounted on the side surface of the table 50 through a reading head mounting plate, and the reading head 37 scans the scales on the surface of the grating scale 38 to achieve high-precision positioning and feedback. Preferably, the encoder system of the present embodiment employs an absolute encoder, which can record any position point on the moving stroke, and no data loss occurs in case of power failure.
The mechanical limit switch of the present embodiment is mounted on the bottom plate 23 by a screw, and the trigger block is mounted at the bottom of the worktable 50, specifically, the mechanical limit switch and the corresponding trigger block are respectively mounted at the front end and the rear end of the bottom plate 23 of the present embodiment to perform a stroke control function, when the guide tube 16 or the collimator tube 18 of the present embodiment moves to the beam center position, if the guide tube 16 or the collimator tube 18 continues to move due to an encoder failure or other reasons, the mechanical limit switch is triggered, so that the motor 21 is powered off and stops rotating.
Referring to fig. 5 to 7, the base and the supporting system of the present embodiment mainly include a bottom plate 23, a bottom plate connecting plate 22, guide rails 14 and sliders 29 disposed at the bottom, wherein the bottom surface of the bottom plate 23 is fixed on the top surfaces of the right bottom plate 12 and the left bottom plate 13 through the bottom plate connecting plate 22, the two guide rails 14 are installed at two sides of the top surface of the bottom plate 23 in parallel and symmetrically distributed, the two guide rails 14 are fixed on the surface of the bottom plate 23 through screws, the sliders 29 matched and slidably connected are disposed on the surface of the guide rails 14, the two sliders 29 are connected on the surface of each guide rail 14 in a sliding fit manner, and balls are disposed inside the sliders 29, so that the sliders. Preferably, the sliding friction coefficient between the slider 29 and the guide rail 14 of the present embodiment is very small, only 0.005. In addition, the slide block 29 of the present embodiment is mounted on the bottom surface of the table 50 in a symmetrical manner, and the slide block 29 is fixedly connected to the table 50 with screws, thereby allowing the table 50 to slide relative to the base 3.
Referring to fig. 5 to 7, the guide tube and the adjustment system of the present embodiment mainly include a guide tube 16, an adjustment system and a guide tube connection plate 28, wherein the guide tube 16 is used as a core component, which can be located at the beam center position and can play a role of transmitting neutron beam, and two sets of adjustment systems are provided at the bottom of two ends of the guide tube 16, the adjustment system is fixedly connected with the guide tube 16 through an adjustment mechanism connection plate 25, the six-dimensional adjustment of the guide tube 16 in space can be realized through the cooperation and adjustment of the two sets of adjustment systems, and the adjustment system is fixed on the surface of the workbench 50 through the guide tube connection plate 28.
The collimator and the governing system of this embodiment mainly include collimator 18 and set up the governing system in 18 bottom surfaces of collimator, and wherein collimator 18 is the core operating means of this embodiment also, when collimator 18 is located the beam central line, can play the effect of transmission neutron beam and absorption spurious neutron, and the governing system of this embodiment sets up in collimator 18's axial both ends bottom position to make adjustment mechanism connecting plate 25 and collimator 18 fixed the linking to each other through governing system.
Referring to fig. 9, the adjusting system of the present embodiment includes an adjusting mechanism bottom plate 30, a horizontal moving plate 34 and an elevation adjusting plate 35 installed from bottom to top, wherein the adjusting mechanism bottom plate 30 is fixedly installed on the base, the horizontal moving plate 34 is installed on the adjusting mechanism bottom plate 30, the horizontal moving plate 34 is in a rectangular block shape, three sides of the adjusting mechanism bottom plate are installed with six horizontal adjusting assemblies 31, two horizontal adjusting assemblies 31 are respectively installed on each of two corresponding sides parallel to the beam direction, the horizontal adjusting assemblies 31 on the two sides are designed in an axial symmetry manner, two sides near the outside of the two corresponding sides perpendicular to the beam direction are installed, and the sides near the inside are not installed.
The horizontal adjusting assemblies 31 on two corresponding sides parallel to the beam direction comprise horizontal fixing blocks 51 and horizontal adjusting screws 33, the horizontal fixing blocks 51 on the two sides are in an axisymmetric design and used for fixing the limiting horizontal moving plate 34, the horizontal fixing blocks 51 are fixedly mounted on the adjusting mechanism bottom plate 30 through screws in the vertical direction, each horizontal fixing block 51 is provided with a horizontal adjusting screw 33 in the horizontal direction, the horizontal adjusting screws 33 penetrate through the horizontal fixing blocks 51, the bottoms of the rear ends of the horizontal adjusting screws 33 directly support the horizontal moving plate 34, the other ends of the horizontal adjusting screws extend out of the horizontal fixing blocks 51, and the positions of the horizontal moving plate 34 in the horizontal direction are adjusted under the action of thread pairs by rotating the horizontal adjusting screws 33.
The two horizontal adjusting assemblies 31 on the side surface close to the outside in the two corresponding side surfaces perpendicular to the beam direction are in central axis symmetry, each horizontal adjusting assembly comprises a horizontal fixing block 51, a group of push rod assemblies 53 and a group of pull rod assemblies 52 which are connected through the horizontal fixing block 51, each push rod assembly 53 comprises a rotating screw and a nut, the bottom of one end of the rotating screw penetrates through the horizontal fixing block and is directly abutted against the horizontal moving plate 34, the other end of the rotating screw extends outside the horizontal fixing block 34, and the position of the horizontal moving plate 34 in the horizontal direction is pushed and adjusted under the action of a thread pair through the rotating screw; the pull rod assembly 52 comprises a pull rod with threads, a nut and a step block, the step block 54 is fixedly mounted on the horizontal moving plate 34 through a screw, the pull rod penetrates through the horizontal fixing block, the bottom of one end of the pull rod is fixedly connected with the step block 54, the pull rod is fixedly connected with the horizontal moving plate 34 through the step block 54, the other end of the pull rod extends outside the horizontal fixing block 51, and the position of the horizontal moving plate in the horizontal direction is pulled and adjusted under the action of a thread pair through rotating the nut.
The elevation adjusting plate 35 is a rectangular plate, the elevation adjusting plate 35 is installed above the horizontal moving plate 34 through the elevation adjusting assembly 32, and the position of the elevation adjusting plate 32 in the space can be adjusted through adjusting a nut of the elevation adjusting assembly 32; it should be noted that the adjusting system of the present invention is similar to the structure and principle of the bottom adjusting mechanism in a neutron guide system with a multi-stage collimation adjusting mechanism, which is disclosed in chinese patent application No. 2019110535744, and the difference lies in the adjusting structure and adjusting method in the horizontal direction, the horizontal adjusting assembly 31 of the present invention is divided into two types, one of which is used for horizontal adjustment in the direction parallel to the beam line and the other is used for horizontal adjustment in the direction perpendicular to the beam line, wherein the horizontal adjustment in the direction parallel to the beam line is bidirectional adjustment, and the horizontal adjustment in the direction perpendicular to the beam line is unidirectional push-pull adjustment, that is, a pull rod assembly 52 and a push rod assembly 53 capable of realizing single-side push-pull are adopted, and due to the opposite space limitation, an adjusting assembly operated by a single side is required in the. And along bunch direction, have sufficient operating space, so adopt the mode of screw butt top to adjust, simple accurate and convenient and fast.
When the beam stopper main assembly 17 of the present embodiment is located on the beam center line, the beam shielding system is composed of the beam stopper upper assembly 8, the beam stopper main assembly 17, and the beam stopper lower assembly 11, and the beam can be blocked to the maximum extent. Because the actual three-dimensional size of the beam shielding system needs to be 20mm larger than the theoretical calculation size, the error between the central line of the beam shielding system and the beam central line is less than 10mm, and the precision can be ensured by processing and assembling.
Referring to fig. 12, the beam stop main assembly 17 of the present embodiment is fixedly mounted on the surface of the workbench 50, and can switch between three working states along with the horizontal movement of the workbench 50, and the beam stop main assembly 17 is provided with an elevation target holder 46 and a horizontal target holder 45 on the surface, so that the alignment measurement can be performed by using the alignment apparatus. In addition, the surface of the guide tube 16 and the surface of the collimation tube 18 of the embodiment are respectively provided with a target seat, so that the collimation calibration can be carried out by utilizing a measuring arm, and the position detection and the collimation installation can be carried out by utilizing a laser tracker.
The conduit 16, the beam stopper main assembly 17 and the collimator 18 of the present embodiment are all mounted on the surface of the table 50 and arranged in parallel, wherein the beam stopper main assembly 17 is located between the conduit 16 and the collimator 18, the conduit 16 and the collimator 18 are located at both sides of the beam stopper main assembly 17, and since there is a need for a sufficient space for switching positions of different operation modes in the actual operation process, any shielding cannot be performed on the stroke space, and the present embodiment requires a gap between the beam stopper main assembly 17 and the conduit 16 and a gap between the beam stopper main assembly 17 and the collimator 18 to be minimized, so that the stroke space required for switching operation modes can be reduced, and the shielding effect can be enhanced.
Referring to fig. 7, 10 and 11, the present embodiment further includes an auxiliary adjusting mechanism, wherein the auxiliary adjusting mechanism includes an auxiliary adjusting plate 39, an auxiliary adjusting screw 40 and a fixing screw 43, the auxiliary adjusting mechanism can perform auxiliary adjustment on the bottom plate connecting plate 22, the auxiliary adjusting mechanism is firstly fixed on the side surfaces of the left bottom plate 13 and the right bottom plate 12 by a fixing screw 41, wherein the front and rear end surfaces of the left bottom plate 13 are respectively installed in one group, the left side of the left bottom plate 13 is installed in two groups, the front and rear end surfaces of the right bottom plate 12 are respectively installed in one group, and the right side surface is installed in two groups, the position of the bottom plate connecting plate 22 in the horizontal direction can be adjusted by adjusting the auxiliary adjusting screw 40 of the auxiliary adjusting mechanism 42, and the adjustment is performed by increasing or decreasing the gasket in the elevation direction, because the installation accuracy of the bottom plate connecting plate 22 is low, after the adjustment is completed, the locking is performed by the two fixing screws 43, and then all the auxiliary adjusting structures and the target base with the pin are removed, and since the target base with the pin can be accurately positioned by the pin and the bottom plate connecting plate 22, the position accuracy of the target base cannot be influenced by the re-installation after the removal.
Referring to fig. 1 to 12, the present embodiment further discloses a collimation method of a multi-station switching high-precision second neutron beam switch, which is to install a guide tube 16 and a collimator tube 18 in a correct position in a collimation manner, so that a beam shielding system can ensure position precision through design, machining and installation, wherein the basic collimation and installation method includes the following steps:
step S1: and calibration, namely, establishing a relative position relationship between the target component and the target seat in a three-dimensional space, adjusting the position of the target component by adjusting the target seat, and respectively calibrating the guide pipe 16 and the collimator 18.
The catheter 16 is first calibrated: the method comprises the steps of placing a guide pipe 16 on an optical platform, measuring the inner side surface and the front and rear end surfaces of the guide pipe 16 by using a measuring arm, then measuring a guide pipe target seat on the outer surface of the guide pipe 16, and establishing the space position relation between the inner size of the guide pipe 16 and the guide pipe target seat, wherein the inner surface machining precision of the guide pipe 16 is high, and the theoretical position of the inner surface of the guide pipe 16 in the space is known, so that the theoretical position coordinate of the guide pipe target seat in the space is obtained. It should be noted that the calibration process performed on the straight pipe is the same as that performed on the catheter in this embodiment.
Calibration is then performed on the straight tube 18: placing a collimator 18 on an optical platform, measuring the inner side surface and the front and rear end surfaces of the collimator 18 by using a measuring arm, then measuring a target seat on the outer surface of the collimator 18, and establishing the relation between the inner size of the collimator 18 and the spatial position of the collimator target seat to obtain the theoretical position coordinate of the collimator target seat in space;
calibration of the beam stopper main assembly 17: then, because the beam stop main assembly 17 and the bottom plate connecting plate 22 are low in positioning accuracy, all machining and mounting errors can be ignored without calibration, the theoretical position coordinates of the target seat in space can be directly obtained only by using drawing dimensions, and because the actual dimension of the beam stop main assembly 17 is much larger than the theoretical calculation dimension and is far larger than the error generated by machining and assembling, the beam stop main assembly is directly assembled and positioned on the basis of rough positioning of the bottom plate connecting plate 22.
Step S2: installing the bottom plate connecting plate 22 of the base station 3, firstly utilizing the laser tracker to carry out collimation and pay-off, utilizing the laser tracker to arrange eight points on the ground, wherein the points in the horizontal and vertical directions are connected in pairs, and finally four straight lines are intersected to form a rectangular frame, the length and the width of the rectangular frame are equal to those of the base station 3, then installing the base station 3 with the embedded steel plate on the top on the ground, correspondingly superposing four side lines of the bottom surface of the base station 3 and the four straight lines on the ground, then installing and fixing the left side bottom plate 13, the right side bottom plate 12 and the beam stop block lower component 11 on the base station 3 through bolts, then installing and fixing the bottom plate connecting plate 22, without screwing fixing screws in the installation process, respectively installing eight groups of auxiliary adjusting mechanisms on the right side bottom plate 12 and the left side bottom plate 13, installing the target seat with pins on the bottom plate connecting plate 22 through, and monitoring the position coordinates of the target seat by using a laser tracker, adjusting eight groups of auxiliary adjusting structures 42, adjusting in the elevation direction by adding or reducing gaskets, and when the deviation between the coordinate measurement value of the target seat and the theoretical coordinate is less than 3mm, installing the bottom plate connecting plate 22 at the theoretical position, then detaching the target seat and the auxiliary adjusting structures 42, and finally screwing the fixing screws 36.
Step S3: the switch movement system is installed by first assembling the power transmission system, the control system, the base and the support system so that the work table 50 can smoothly run, and then integrally installed on the base plate connection plate 22, positioned by the positioning pins and locked by the bolts. Then install beam current dog main assembly connecting plate 44 on workstation 50 through the locating pin to install beam current dog main assembly 17 on beam current dog main assembly connecting plate 44, utilize laser tracker to measure the elevation target seat on beam current dog main assembly 17, when the error of measurement numerical value and theoretical numerical value of elevation target seat height direction and along the beam current direction is less than 5mm, namely beam current main block assembly 17 is installed in place in the height direction and along the beam current direction, because the installation error of bottom plate connecting plate is 3mm, and all parts above bottom plate connecting plate 22 all are bolted connection after carrying out the location through the locating pin, and the precision loss is very little. The error requirements of the upper height target seat of the beam current stop main assembly 17 in the height direction and the beam line direction are less than 5mm, so that the beam current stop main assembly 17 can be arranged in place in alignment in the two directions without an adjusting process; in the process, the value of the elevation target holder perpendicular to the beam direction is not required to be adjusted, then the conduit connecting plate 28, the adjusting mechanism at the bottom of the conduit 16 and the conduit 16 are installed on the workbench, and the collimator 17 and the adjusting mechanism at the bottom are installed on the workbench 50.
Step S4: collimation installation and debugging:
firstly, the motor 21 and the encoder system are electrified, the workbench 50 is driven by the motor 21 to horizontally move, and the laser tracker is used for detecting the horizontal target seat on the beam stopper main assembly 17.
Then the motor 21 rotates again, the work table 50 moves horizontally for a theoretical length of L1, at this time, the center of the guide tube 16 is located near the center of the beam, the laser tracker is used to detect the target seat on the guide tube 16, two sets of adjusting systems at the bottom are adjusted, during the adjusting process, if the deviation between the measured value and the theoretical value of the target seat is large, the work table can also be moved for adjustment, when the deviation between the measured value of the coordinates of the target seat and the theoretical coordinates obtained by calibration is smaller than 0.05mm, the encoder records the current position, and the guide tube 16 is installed at the theoretical position.
Then the motor 21 rotates to make the workbench 50 horizontally move by the theoretical length L2, the center of the collimator 18 is located near the center of the beam, the laser tracker is used to detect the target seat on the collimator 18, two groups of adjusting systems at the bottom are adjusted, in the adjusting process, if the deviation between the measured value and the theoretical value of the target seat is large, the adjustment can be carried out by moving the workbench, when the deviation between the coordinate measured value of the target seat and the theoretical coordinate obtained by calibration is less than 0.05mm, the encoder records the current position, namely the collimator 18 is installed on the theoretical position, and the collimation installation is finished.
Step S5: finally, a front shielding support plate 10, a rear shielding support plate 4, a top support plate 6, a left side top plate 7, a beam stop upper assembly 8 and a right side top plate 9 are installed, so that the installation of the whole multi-station switching high-precision second neutron beam line switch is completed.
In addition, in the technical scheme of the embodiment of the invention, the main beam stop block assembly 17 is positioned in the middle, the guide pipe 16 and the collimator 18 are respectively positioned on two sides, an encoder adopted by an encoding system can record any position on a movement stroke, and the encoding system is still positioned at a working position under the condition of power failure without losing a recorded position point.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (5)
1. Be applied to beam current shielding system in multistation switching second neutron beam switch, beam current shielding system install in the second neutron beam switch that can realize the multistation switching, its characterized in that: the second neutron beam switch comprises a shielding support system arranged on the periphery, a switch motion system arranged in the shielding support system and a beam shielding system which is simultaneously connected with the shielding support system and the switch motion system to realize beam shielding; the beam shielding system comprises a beam stopper upper component connected with the top supporting plate, a beam stopper main component connected with the switch motion system and a beam stopper lower component connected with the base station, and the beam stopper main component realizes the switching of different working modes through horizontal motion; when the second neutron beam switch is positioned at the first station, the guide pipe is positioned on the beam central line, and the guide pipe plays a role in transmitting the neutron beam; in the second station, the collimator is positioned on the beam central line, and the collimator plays a role in transmitting neutron beam; during the third station, beam current shield system's beam current dog main part is located the beam current central line and plays and cuts off neutron beam current and realize the shielding effect, beam current dog main part beam current dog upper portion subassembly and beam current dog lower part subassembly are equallyd divide and are piled up the connection in proper order by different material layers and form respectively.
2. The beam shielding system applied to the multi-station switching second neutron beam line switch according to claim 1, wherein: the stop dog main assembly comprises a boron carbide block, a lead block and a carbon steel shielding block which are fixedly connected in sequence through bolts, and a shielding layer formed by connecting different materials in sequence can shield different types of ions through different materials and can also shield neutron beam current and other particles derived from the neutron beam current.
3. The beam shielding system applied to the multi-station switching second neutron beam line switch according to claim 1, wherein: the beam stop main assembly is fixedly mounted on the surface of the workbench, the switching of three working states can be carried out along with the horizontal movement of the workbench, an elevation target seat and a horizontal target seat are arranged on the surface of the beam stop main assembly, and collimation measurement can be carried out by using collimation equipment.
4. The beam shielding system applied to the multi-station switching second neutron beam line switch according to claim 1, wherein: when the main assembly of the beam stop block is positioned on the beam central line, the beam can be blocked to the maximum extent through the beam shielding system formed by the upper assembly of the beam stop block, the main assembly of the beam stop block and the lower assembly of the beam stop block.
5. The beam shielding system applied to the multi-station switching second neutron beam line switch according to claim 1, wherein: the guide pipe, the beam current stop block main assembly and the collimator are all installed on the surface of the workbench and arranged in parallel, wherein the beam current stop block main assembly is located between the guide pipe and the collimator, and the guide pipe and the collimator are located on two sides of the beam current stop block main assembly.
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| CN111208157B (en) | 2022-12-30 |
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