CN107727673B - Heavy-load precise centering adjusting device for thick pinhole collimator - Google Patents
Heavy-load precise centering adjusting device for thick pinhole collimator Download PDFInfo
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- CN107727673B CN107727673B CN201711095053.6A CN201711095053A CN107727673B CN 107727673 B CN107727673 B CN 107727673B CN 201711095053 A CN201711095053 A CN 201711095053A CN 107727673 B CN107727673 B CN 107727673B
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- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
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Abstract
The invention discloses a heavy-duty precise centering adjusting device for a thick pinhole collimator, wherein a Y-axis adjusting mechanism I, a Z-axis adjusting mechanism I and a plane spherical hinge mechanism in the device are combined to form a front end support of the thick pinhole collimator; the Y-axis adjusting mechanism II, the Z-axis adjusting mechanism II and the tail pressing seat mechanism are combined to form a tail end support of the thick pinhole collimator; the front end of the thick pinhole collimator is fixed at the center of the plane spherical hinge mechanism, and the tail end of the thick pinhole collimator is connected with the tail pressing seat mechanism. According to the invention, the adjusting precision is improved through the bevel gear combination, the harmonic speed reduction and the driving hand wheel combination, and the self-locking function after the adjustment is completed is realized; the tail pressing seat mechanism adopts a spherical support and an upper pressing block spring locking structure, so that drift of light spots in a locking state is avoided. The invention can realize the relative position determination of the laser spot of the reference optical axis of the thick pinhole collimator and the center of the collimation hole in front of the imaging plate, and can realize the measurement of the arc edge position in the image of the imaging plate to obtain the diameter of the field of view.
Description
Technical Field
The invention belongs to the technical field of machinery, and particularly relates to a heavy-load precise centering adjusting device for a thick pinhole collimator.
Background
At present, the thick pinhole imaging technology has the advantages of visual reflection of source region images and high accuracy, is widely applied to neutron source, gamma and hard X-ray source image diagnosis, relates to the research fields of nuclear explosion, pulse reactor, thermonuclear fusion, nuclear medicine imaging, environmental nuclear radiation monitoring and the like, the thick pinhole collimator is a thick pinhole photographing main body part, the thick pinhole collimator adjusting mechanism is a key component for realizing the correct positioning of the thick pinhole collimator in a space state, the center position of a field of view is determined by the relative position of a laser spot of a reference optical axis and the center of a collimation hole in front of an imaging plate, and then the arc-shaped edge position in the imaging plate image is measured to obtain the diameter of the field of view. In order to realize the relative position of the axis translation of the thick pinhole and the collimation hole in front of the imaging plate, the thick pinhole collimator needs to be arbitrarily centered in a space state, and the heavy-load precise centering adjusting device is not reported at present.
Disclosure of Invention
The invention aims to provide a heavy-duty precise centering adjustment device for a thick pinhole collimator.
The heavy-duty precise centering adjustment device for the thick pinhole collimator can determine the relative position of a laser spot of a reference optical axis of the thick pinhole collimator and the center of a collimation hole in front of an imaging plate, and can measure the arc edge position in an image of the imaging plate to obtain the diameter of a field of view.
The technical scheme of the invention is as follows:
the heavy-duty precise centering adjusting device of the thick pinhole collimator is characterized by comprising a Y-axis adjusting mechanism I, a Y-axis adjusting mechanism II, a Z-axis adjusting mechanism I, a Z-axis adjusting mechanism II, a plane spherical hinge mechanism, a tail pressing seat mechanism, the thick pinhole collimator and an installation bottom plate; the connection relation is that the Z-axis adjusting mechanism I is positioned right above the Y-axis adjusting mechanism I; the Z-axis adjusting mechanism II is positioned right above the Y-axis adjusting mechanism II; the plane spherical hinge mechanism is positioned right above the Z-axis adjusting mechanism I; the tail pressing seat mechanism is positioned right above the Z-axis adjusting mechanism II. The mounting bottom plate is fixed on the ground. The Y-axis adjusting mechanism I, the Z-axis adjusting mechanism I and the plane spherical hinge mechanism are combined to form a front end support of the thick pinhole collimator. The Y-axis adjusting mechanism II, the Z-axis adjusting mechanism II and the tail pressing seat mechanism are combined to form a tail end support of the thick pinhole collimator. The front end support and the tail end support of the thick pinhole collimator are respectively fixed at two ends of the mounting bottom plate and are centrosymmetric. The front end of the thick pinhole collimator is fixed at the center of the plane spherical hinge mechanism, and the tail end of the thick pinhole collimator is connected with the tail pressing seat mechanism. The heavy-duty precise centering adjusting device is positioned on the pinhole photographic light path.
The Y-axis adjusting mechanism I comprises a linear module, a slide seat connecting plate, a Y-axis fixed connecting seat, a coupler, a connecting shaft I, a harmonic reducer II, a connecting shaft II, a driving hand wheel II and a protection plate. The base of the linear module is fixed at one end of the mounting bottom plate. The linear module is characterized in that a slide seat connecting plate is arranged on a slide seat of the linear module and can move along a Y axis. The driving shaft end of the linear module is provided with a Y-axis fixed connecting seat, and the center of the Y-axis fixed connecting seat coincides with the center of the driving shaft of the linear module. The harmonic reducer II is fixed on the Y-axis fixed connecting seat, one end of the harmonic reducer II stretches into the cavity of the Y-axis fixed connecting seat and is fixed with the driving shaft of the linear module sequentially through the connecting shaft II and the coupling, and the other end of the harmonic reducer II is fixed with the driving hand wheel II through the connecting shaft I. The protection board is fixed on the Y-axis fixed connecting seat. The Y-axis fixed connecting seat, the coupler, the connecting shaft I, the harmonic reducer II, the connecting shaft II and the driving hand wheel II are coaxially arranged.
The structure of the Y-axis adjusting mechanism II is the same as that of the Y-axis adjusting mechanism I.
The Z-axis adjusting mechanism I comprises an inner supporting frame, a precise screw rod, a screw rod nut, a Z-axis movable connecting seat, a movable frame, a tapered roller bearing I, a bearing gland I, a guide sliding rail, a guide sliding block, a dust-proof plate, a tapered roller bearing IV, a bevel gear I, a bevel gear II, a nut, an angular contact angular bearing, a Z-axis fixed connecting seat, a harmonic reducer I, an input shaft, a reducer baffle, an output shaft and a driving hand wheel I. The inner support frame and the movable frame are sleeved with each other to form a support body of the Z-axis adjusting mechanism I. The inner supporting frame bottom plate is fixed on a sliding seat connecting plate of the Y-axis adjusting mechanism. The guide sliding rail and the guide sliding block are arranged between the inner supporting frame and the moving frame, the guide sliding rail is fixed at the center position of the outer side end face of the inner supporting frame, and the guide sliding block is fixed at the center position of the inner side end face of the moving frame. The center of the inner supporting frame is provided with a Z-axis transmission mechanism consisting of a precise screw rod, a screw rod nut, a Z-axis movable connecting seat and a bevel gear I, the precise screw rod rotates around the Z axis, and the screw rod nut moves up and down along the precise screw rod. The precise screw rod is assembled with the inner supporting frame through the tapered roller bearing I and the tapered roller bearing IV and is pressed and fixed by the bearing gland I and the tapered roller bearing IV, and one end of the precise screw rod penetrates through the fixing surface of the inner supporting frame and is fixedly connected with the bevel gear I. The screw nut is fixedly connected with the movable frame through the Z-axis movable connecting seat, and the movable frame moves up and down along the Z-axis. The center of the outer side of the inner supporting frame is provided with a Z-axis fixed connecting seat. The Z-axis driving mechanism consisting of a harmonic reducer I, an input shaft, a reducer baffle, an output shaft, a driving hand wheel I, a bevel gear II, a nut and an angular contact angular bearing is arranged in the center of the Z-axis fixed connection seat. The harmonic reducer I pass through the reduction gear baffle to be fixed on the boss terminal surface of Z axle fixed connection seat, the one end of harmonic reducer I passes through input shaft and I fixed connection of drive hand wheel, the other end of harmonic reducer I passes through output shaft, II fixed connection of bevel gear. The output shaft and the Z-axis fixed connecting seat are assembled through a centripetal angular contact bearing and are fixed on the connecting seat through nuts. The bevel gear II, the output shaft, the harmonic reducer I, the input shaft, the driving hand wheel I and the reducer baffle are coaxially arranged. The bevel gear I and the bevel gear II are meshed to generate transmission. The dustproof plate is arranged at the opening of the movable frame.
The structure of the Z-axis adjusting mechanism II is the same as that of the Z-axis adjusting mechanism I.
The plane spherical hinge mechanism comprises a hinge seat main body, an outer frame, a bearing gland II, a tapered roller bearing II, a supporting shaft I, an inner frame, a bearing gland III, a tapered roller bearing III and a supporting shaft II, wherein the center of the inner frame is a round hole. The hinged support main body is fixedly connected to a movable frame in the Z-axis adjusting mechanism. The outer frame is assembled with the outer frame through the supporting shaft and the tapered roller bearing II and is pressed and fixed by the bearing gland II, and the outer frame is used for rotating around the supporting shaft I in the Y-axis direction. The inner frame is assembled with the outer frame through a support shaft II and a tapered roller bearing III and is pressed and fixed by a bearing gland III, and the inner frame is used for rotating around the support shaft II in the Z-axis direction.
The tail seat pressing mechanism comprises a supporting block, a spherical pressing block, a guide screw I, a spring II, an upper pressing block and a guide screw II, wherein the center of the supporting block is a U-shaped opening, and the opening is right above; the spherical pressing block is square in shape, is provided with a round hole in the center and is provided with an arc surface on the front end surface; the upper pressing block is T-shaped, and the convex lower end surface is a cylindrical surface; the four vertex angles of the spherical pressing block are provided with spring reset mechanisms consisting of guide screws I and springs I, and the spherical pressing block is fixed on the outer side of the supporting block through the spring reset mechanisms; the guide screw I penetrates through the guide hole of the spherical pressing block and is fixed at the center of the supporting block; the upper pressing block is fixed on the upper end face of the supporting block, the protruding lower end of the upper pressing block is matched with the U-shaped opening of the supporting block, and the two ends of the top surface of the upper pressing block are provided with spring reset mechanisms consisting of springs II and guide screws II; the guide screw II penetrates through the guide hole of the upper pressing block and is fixed on the upper end surface of the supporting block; the spherical pressing block and the upper pressing block are respectively provided with a through hole which is locked with the supporting block and used for locking after the adjustment is completed.
The reduction ratio of the harmonic speed reducer II is 1:50.
The outer surface of the front end cylinder of the collimator is matched with the inner surface of the round hole in the center of the inner frame.
The outer surface of the rear end cylinder of the collimator is matched with the inner surface of the round hole in the center of the supporting block.
The rear end sphere of the collimator is matched with the sphere of the spherical pressing block.
The outer surface of the rear end cylinder of the collimator is matched with the lower end of the upper pressing block by a cylindrical surface
The bevel gear I and the bevel gear II are arranged in a matched mode.
According to the invention, the thick pinhole collimator is precisely centered and adjusted, and finally, the reference light passes through the center of the tail support mechanism of the thick pinhole collimator and is precisely adjusted by adjusting the corresponding adjusting mechanism of the tail support until the far-end diffraction light ring meets the test requirement.
The precise adjustment is realized by a Y-axis adjusting mechanism and a Z-axis adjusting mechanism, so that the thick pinhole collimator is arbitrarily centered in the space of the X-axis direction.
In the adjusting process of the space state of the thick pinhole collimator, the rotation center of the plane spherical hinge mechanism is used as a fixed selection point, the projection length of the thick pinhole collimator in the plane direction can be prolonged or shortened in the adjusting process, the pressing block on the tail of the thick pinhole collimator adopts spring pre-tightening and an arc supporting plane, interference is avoided, the occurrence of small internal stress change is ensured, the thick pinhole collimator is prevented from drifting after the state setting, and the stability requirement of the technical state is ensured.
The Y-axis adjusting mechanism adopts a commercial linear module to form a main moving part, meanwhile, in order to achieve better adjusting hand feeling for self-locking and adjustment of the linear module, a driving part of the linear module consists of a driving hand wheel II and a harmonic reducer II, and the good self-locking performance of the Y-axis moving mechanism is ensured by adding the harmonic reducer II with a large reduction ratio.
The Z-axis adjusting mechanism adopts a precise screw rod and screw rod nut combination mode to form a lifting unit with a self-locking function, adopts a high-precision guide sliding rail and a guide sliding block to form a screw rod nut guide unit, and drives a hand wheel I and a reversing gear assembly to form a Z-axis manual driving module.
In the power transmission process of the precise screw rod, the precise screw rod is always used under the vertical condition, and the precise screw rod and the screw rod nut are always in a pressed state, so that the rotation clearance of the precise screw rod and the screw rod nut can not influence the transmission precision of the system.
The driving part of the Z-axis adjusting mechanism adopts a structure mode of matching a gear set with a larger driving hand wheel I, smaller displacement adjusting response precision is met, and the positioning precision of the Z-axis moving mechanism can be improved by increasing the size of the driving hand wheel I.
The inner frame and the outer frame in the plane spherical hinge mechanism form a cross shaft, two degrees of freedom rotation space shafts are formed on a plane, the dimensional accuracy and the error of two orthogonal axes of the cross are not related to each other, the radial runout is small only when the plane spherical hinge mechanism rotates at a small angle, a double-cone roller bearing is adopted as a main body of a structural support, bearing covers at two ends are utilized for pre-tightening, the radial runout with higher accuracy can be obtained, and the rigidity of two rotating shafts in the plane spherical hinge structure is improved by installing the cone roller bearings face to face.
The tail pressing seat mechanism is a locking device of the thick pinhole collimator adjusting mechanism, in order to facilitate the installation and debugging of the thick pinhole collimator, a spring pre-tightening and arc supporting surface mode is adopted at the tail, interference during the adjustment of the thick pinhole collimator is avoided, the space state of the thick pinhole collimator after adjustment and fixation is prevented from drifting, the gaps between the supporting block and the tail supporting surface of the thick pinhole collimator adopt medium precision tolerance matching to ensure that a micro gap can be formed when the tail supporting surface of the thick pinhole collimator rotates around a plane spherical hinge, the gap is provided by a pre-pressed spring I and a pre-pressed spring II, and the gap is locked by a screw after the adjustment is finished.
The upper pressing block spring reset mechanism in the tail pressing seat mechanism enables the thick pinhole collimator to slide along the X axis in a small amount, and a large precompression is always provided for pressing the thick pinhole collimator onto the plane spherical hinge mechanism, so that drift of light spots in a locking state is avoided.
The centering adjustment process of the invention is as follows:
before the thick pinhole collimator is not installed, the front end support and the tail end support of the thick pinhole collimator ensure that the center of the plane spherical hinge mechanism and the center of the tail pressing seat mechanism are basically up to the center of an optical axis by adjusting driving wheels of the corresponding Y-axis adjusting mechanism and Z-axis adjusting mechanism.
The center of the plane spherical hinge mechanism needs to be precisely adjusted through the optical centering plate, so that the reference optical axis passes through the center of the centering plate of the plane spherical hinge mechanism and coincides with the center of the centering plate.
The center of the tail pressing seat mechanism needs to be precisely adjusted through the optical centering plate, so that the reference optical axis passes through the center of the centering plate of the tail supporting mechanism and coincides with the center of the centering plate.
The heavy-load precise centering adjustment device of the thick pinhole collimator can bear 150 kg-500 kg of thick pinhole collimator.
The invention has the beneficial effects that the invention can realize the determination of the relative position of the laser spot of the reference optical axis of the thick pinhole collimator and the center of the collimation hole in front of the imaging plate, and can realize the measurement of the arc edge position in the imaging plate image to obtain the field diameter. The invention has simple structure, reliable connection and convenient use and maintenance, and is easy to realize heavy-load precise centering adjustment of the thick pinhole collimator.
Drawings
FIG. 1 is a perspective view of a heavy duty precision centering adjustment device of a thick pinhole collimator of the present invention;
FIG. 2 is a front view of a heavy duty precision centering adjustment device of the thick pinhole collimator of the present invention;
FIG. 3 is a top view of a heavy duty precision centering adjustment device of the thick pinhole collimator of the present invention;
FIG. 4 is a right side view of the heavy duty precision centering adjustment device of the thick pinhole collimator of the present invention;
FIG. 5 is a cross-sectional view taken along A-A of FIG. 3;
FIG. 6 is a B-B cross-sectional view of FIG. 5;
FIG. 7 is an enlarged schematic view of portion D of FIG. 5;
FIG. 8 is a cross-sectional view taken along the C-C plane of FIG. 6;
fig. 9 is a perspective view of an inner support frame in the present invention;
fig. 10 is a perspective view of a moving frame in the present invention;
FIG. 11 is a perspective view of a Z-axis kinematic coupling seat of the present invention;
FIG. 12 is a perspective view of a Z-axis stationary connection base in the present invention;
FIG. 13 is a perspective view of a Y-axis stationary connection base in the present invention;
in the figure, the Y-axis adjustment mechanism I102, the Y-axis adjustment mechanism II 103, the Z-axis adjustment mechanism I104, the Z-axis adjustment mechanism II 2, the linear module 3, the slide connection plate 4, the inner support frame 5, the drive hand wheel I6, the precision screw 7, the screw nut 8.Z, the shaft movement connection seat 91, the moving frame I10, the tapered roller bearing I11, the guide slide rail 13, the guide slide block 14, the hinge seat body 15, the outer frame 16, the bearing cover II 17, the tapered roller bearing II 18, the support shaft I19, the inner frame 20, the bearing cover III 21, the tapered roller bearing III 22, the support block 23, the spherical pressing block 25, the guide screw 26, the spring I27, the spring II 28, the upper pressing block 29, the pressing ring 30, the dust plate 31, the tapered roller bearing IV 32, the bevel gear I33, the bevel gear II 34, the nut 35, the angular contact bearing 36, the Z-axis fixed connection seat 37, the harmonic reducer I38, the input shaft 39, the speed reducer 40, the output shaft 41, the drive hand wheel II 42, the coupling shaft II 43, the speed reducer II 44, the shaft 45, the shaft pin hole 45, the fixed shaft 47, the base plate 60, the shaft hole 46, the fixed shaft pin hole 47, and the base plate 60.
Detailed Description
The invention is further described below with reference to the drawings and examples of implementation.
Example 1
FIG. 1 is a perspective view of a heavy duty precision centering adjustment device of a thick pinhole collimator of the present invention. Fig. 2 is a front view of a heavy duty precision centering adjustment device structure of a thick pinhole collimator of the present invention, fig. 3 is a top view of the heavy duty precision centering adjustment device of the thick pinhole collimator of the present invention, fig. 4 is a right side view of the heavy duty precision centering adjustment device of the thick pinhole collimator of the present invention, fig. 5 is A-A cross-sectional view of fig. 2, fig. 6 is B-B cross-sectional view of fig. 4, fig. 7 is a D partial enlarged schematic view of fig. 5, fig. 8 is C-C cross-sectional view of fig. 6, fig. 9 is a perspective view of an inner support frame of the present invention, fig. 10 is a perspective view of a moving frame of the present invention, fig. 11 is a perspective view of a Z-axis moving connection seat of the present invention, fig. 12 is a perspective view of a Z-axis fixed connection seat of the present invention, and fig. 13 is a perspective view of a Y-axis fixed connection seat of the present invention. In fig. 1 to 13, the heavy-duty precision centering adjustment device of the thick pinhole collimator comprises a Y-axis adjustment mechanism i 101, a Y-axis adjustment mechanism ii 102, a Z-axis adjustment mechanism i 103, a Z-axis adjustment mechanism ii 104, a plane spherical hinge mechanism, a tail pressing seat mechanism, a thick pinhole collimator 60 and a mounting bottom plate 70; the connection relation is that the Z-axis adjusting mechanism I103 is positioned right above the Y-axis adjusting mechanism I101; the Z-axis adjusting mechanism II 104 is positioned right above the Y-axis adjusting mechanism II 102; the plane spherical hinge mechanism is positioned right above the Z-axis adjusting mechanism I103; the tail pressing seat mechanism is arranged right above the Z-axis adjusting mechanism II 104; the mounting base plate 70 is fixed on the ground; the Y-axis adjusting mechanism I101, the Z-axis adjusting mechanism I103 and the plane spherical hinge mechanism are combined to form a front end support of the thick pinhole collimator; the Y-axis adjusting mechanism II 102, the Z-axis adjusting mechanism II 104 and the tail pressing seat mechanism are combined to form a tail end support of the thick pinhole collimator 60; the front end support and the tail end support of the thick pinhole collimator 60 are respectively fixed at two ends of the mounting bottom plate and are centrosymmetric; the front end of the thick pinhole collimator 60 is fixed at the center of the plane spherical hinge mechanism, and the tail end of the thick pinhole collimator 60 is connected with the tail pressing seat mechanism; the heavy-duty precise centering adjusting device is positioned on the pinhole photographic light path.
The Y-axis adjusting mechanism I101 comprises a linear module 2, a slide seat connecting plate 3, a Y-axis fixed connecting seat 47, a coupler 45, a connecting shaft I42, a harmonic reducer II 43, a connecting shaft II 44, a driving hand wheel II 41 and a protection plate 46. The base of the linear module 2 is fixed at one end of the mounting base plate 70. The slide of the linear module 2 is provided with a slide connecting plate 3 which can move along the Y axis. The driving shaft end of the linear module 2 is provided with a Y-axis fixed connecting seat 47, and the center of the Y-axis fixed connecting seat 47 coincides with the center of the driving shaft of the linear module 2. The harmonic reducer II 43 is fixed on the Y-axis fixed connecting seat 47, one end of the harmonic reducer II 43 stretches into the cavity of the Y-axis fixed connecting seat 47 and is fixed with the driving shaft of the linear module 2 sequentially through the connecting shaft II 44 and the coupler 45, and the other end of the harmonic reducer II 43 is fixed with the driving hand wheel II 41 through the connecting shaft I42. The protection plate 46 is fixed on the Y-axis fixing connection seat 47. The Y-axis fixed connecting seat 47, the coupler 45, the connecting shaft I42, the harmonic reducer II 43, the connecting shaft II 44 and the driving hand wheel II 41 are coaxially arranged.
The structure of the Y-axis adjusting mechanism II 102 is the same as that of the Y-axis adjusting mechanism I101.
Z axle adjustment mechanism I103 include interior braced frame 4, accurate lead screw 6, screw nut 7, Z axle remove connecting seat 8, remove frame 91, tapered roller bearing I10, bearing gland I11, direction slide rail 12, direction slider 13, dust guard 30, tapered roller bearing IV 31, bevel gear I32, bevel gear II 33, nut 34, angular contact angular bearing 35, Z axle fixed connection seat 36, harmonic reducer I37, input shaft 38, reduction gear baffle 39, output shaft 40, drive hand wheel I5. The inner support frame 4 and the movable frame 91 are sleeved with each other to form a support body of the Z-axis adjusting mechanism I103. The inner support frame 4 is fixed on the slide connecting plate 3 of the Y-axis adjusting mechanism 103. A guide slide rail 12 and a guide slide block 13 are arranged between the inner support frame 4 and the moving frame 91, the guide slide rail 12 is fixed at the center position of the outer end face of the inner support frame 4, and the guide slide block 13 is fixed at the center position of the inner end face of the moving frame 91. The center of the inner support frame 4 is provided with a Z-axis transmission mechanism consisting of a precise screw rod 6, a screw rod nut 7, a Z-axis movable connecting seat 8 and a bevel gear I32, the precise screw rod 6 rotates around the Z-axis, and the screw rod nut 7 moves up and down along the precise screw rod. The precise screw rod 6 and the inner supporting frame 4 are assembled through the tapered roller bearing I10 and the tapered roller bearing IV 31 and are pressed and fixed by the bearing gland I11, and one end of the precise screw rod 6 penetrates through the extending part of the fixing surface of the inner supporting frame 4 and is fixedly connected with the bevel gear I32. The screw nut 7 is fixedly connected with the movable frame 91 through the Z-axis movable connecting seat 8 and moves up and down along the Z-axis. The center of the outer side of the inner support frame 4 is provided with a Z-axis fixed connecting seat 36. The center of the Z-axis fixed connecting seat 36 is provided with a Z-axis driving mechanism consisting of a harmonic speed reducer I37, an input shaft 38, a speed reducer baffle 39, an output shaft 40, a driving hand wheel I41, a bevel gear II 33, a nut 34 and a centripetal angular contact bearing 39. The harmonic reducer I37 pass through the speed reducer baffle 39 to be fixed on the boss terminal surface of Z axle fixed connection seat 36, the one end of harmonic reducer I37 passes through input shaft 38 and drive hand wheel I41 fixed connection, the other end of harmonic reducer I41 passes through output shaft 40 and bevel gear II 33 fixed connection. The output shaft 38 is assembled with the Z-axis fixed connecting seat 36 through an angular contact bearing 39 and is fixedly connected with the Z-axis fixed connecting seat through a nut 34. The bevel gear II 33, the output shaft 40, the harmonic reducer I41, the input shaft 38, the driving hand wheel I5 and the reducer baffle 39 are coaxially arranged. The bevel gear I32 and the bevel gear II 33 are meshed to generate transmission. The dust-proof plate 30 is disposed at the opening of the moving frame 91.
The structure of the Z-axis adjusting mechanism II 104 is the same as that of the Z-axis adjusting mechanism I103.
The plane spherical hinge mechanism comprises a hinge seat main body 14, an outer frame 15, a bearing gland II 16, a tapered roller bearing II 17, a supporting shaft I18, an inner frame 19, a bearing gland III 20, a tapered roller bearing III 21 and a supporting shaft II 22, wherein the center of the inner frame 19 is a round hole. The hinge base body 14 is fixedly connected to the movable frame 91 in the Z-axis adjusting mechanism I103. The outer frame 15 is assembled with the hinged support main body 14 through the supporting shaft 18 and the tapered roller bearing II 17 and is pressed and fixed by the bearing cover II 16, and the outer frame 15 is used for rotating around the supporting shaft I18 in the Y-axis direction. The inner frame 19 is assembled with the outer frame 15 through a support shaft II 22 and a tapered roller bearing III 21 and is pressed and fixed by a bearing cover III 22, and the inner frame 19 is used for rotating around the support shaft II 22 in the Z-axis direction.
The tail seat pressing mechanism comprises a supporting block 23, a spherical pressing block 24, a guide screw I25, a spring I26, a spring II 27, an upper pressing block 28 and a guide screw II 29, wherein the center of the supporting block 23 is provided with a U-shaped opening, and the opening is right above; the spherical pressing block 24 is square in shape, is provided with a round hole in the center and is provided with an arc surface on the front end surface; the upper pressing block 28 is T-shaped, and the convex lower end surface is a cylindrical surface; the four vertex angles of the spherical pressing block 24 are provided with spring resetting mechanisms consisting of guide screws I25 and springs I26, and the spherical pressing block 24 is fixed on the outer side of the supporting block 23 through the spring resetting mechanisms; the guide screw I25 penetrates through a guide hole of the spherical pressing block 24 and is fixed at the center of the supporting block; the upper pressing block 28 is fixed on the upper end face of the supporting block 23, the protruding lower end of the upper pressing block is matched with the U-shaped opening of the supporting block 23, and the two ends of the top surface of the upper pressing block 28 are provided with spring reset mechanisms consisting of springs II 27 and guide screws II 29; the guide screw II 29 penetrates through a guide hole of the upper pressing block 28 and is fixed on the upper end face of the supporting block 23; the spherical pressing block 24 and the upper pressing block 28 are respectively provided with a through hole which is locked with the supporting block 23 and used for locking after the adjustment is completed. The spring return mechanism formed by the guide screw I25 and the spring I26 has the same structure as the spring return mechanism formed by the spring II 27 and the guide screw II 29.
The shape of the inner supporting frame 4 in the Z-axis adjusting mechanism I103 is door frame-shaped, the supporting plates on two sides are bilaterally symmetrical, rectangular grooves are formed in the outer sides of the supporting plates, reinforcing plates are arranged between the bottom plates and the top plates, and the top plates and the reinforcing plates are provided with assembly holes for installing the precise screw rods 6, as shown in fig. 9.
The movable frame 91 in the Z-axis adjusting mechanism I103 is cuboid in shape, a semi-closed cavity is formed by surrounding plates and a top plate, rectangular through holes are respectively formed in the left side face and the right side face of the surrounding plates, the installation is convenient, the weight is reduced, two waist-shaped through holes are respectively formed in the front side face and the rear side face of the surrounding plates, grooves are respectively formed in the inner surfaces of the left side face and the right side face of the surrounding plates, and the Z-axis movable connecting seat is used for being installed. The top plate is provided with a waist-shaped hole; see fig. 10.
The Z-axis movable connecting seat 8 in the Z-axis adjusting mechanism I103 is rectangular in shape, six faces are symmetrically hollowed out and used for reducing weight, and the hollowed-out part is a cylindrical surface. The Z-axis movable connecting seat 8 is used for connecting the screw nut 7 with the movable frame 91, and the screw nut 7, the Z-axis movable connecting seat 8 and the movable frame 91 integrally move up and down along the Z-axis. See fig. 11.
The Z-axis fixed connecting seat 36 in the Z-axis adjusting mechanism I103 consists of a rectangular plate and a round table with a protruding center position of the rectangular plate, and a cylindrical step hole is formed in the round table. The Z-axis fixed connecting seat 36 is positioned on the outer side of the inner supporting frame 4 and is used for installing a harmonic speed reducer I37, an input shaft 38, a speed reducer baffle 39, an output shaft 40, a driving hand wheel I41, a bevel gear II 33, a nut 34 and an angular contact bearing 39. See fig. 12.
The Y-axis fixed connecting seat 47 in the Y-axis adjusting mechanism I101 is cuboid in shape, circular through holes are formed in the front end face and the rear end face, and the left side, the right side and the top face are hollowed out. The Y-axis fixed connecting seat 47 is used for installing a coupler 45, a connecting shaft I42, a harmonic reducer II 43, a connecting shaft II 44 and a driving hand wheel II 41. See fig. 13.
The reduction ratio of the harmonic speed reducer II is 1:50.
The outer surface of the front end cylinder of the collimator is matched with the inner surface of the round hole in the center of the inner frame.
The outer surface of the rear end cylinder of the collimator is matched with the inner surface of the round hole in the center of the supporting block.
The rear end sphere of the collimator is matched with the sphere of the spherical pressing block.
The outer surface of the rear end cylinder of the collimator is matched with the lower end of the upper pressing block by a cylindrical surface
The bevel gear I and the bevel gear II are arranged in a matched mode.
In the present embodiment, two guide rails are provided in the present invention, and the guide rail 12 is one of the two guide rails; the number of the guide slide blocks is two, and the guide slide block 13 is one of the two guide slide blocks; the two support shafts I are arranged, and the support shaft I18 is one of the two support shafts I; two tapered roller bearings II are arranged, and the tapered roller bearing II 17 is one of the two tapered roller bearings II; the number of the bearing covers II is two, and the bearing cover II 16 is one of the two bearing covers II; the two support shafts II are arranged, and the support shaft II 22 is one of the two support shafts II; two tapered roller bearings III are arranged, and the tapered roller bearing III 21 is one of the two tapered roller bearings III; the number of the bearing covers III is two, and the bearing cover III 20 is one of the two bearing covers III; the guide screws I are four, and the guide screw I25 is one of the four guide screws I; the springs I are four, and the spring I26 is one of the four springs I; the number of the guide screws II is two, and the guide screw II 29 is one of the two guide screws II; the springs II are provided in two, and the spring II 27 is one of the two springs II.
The linear module in the Y-axis adjusting mechanism is a commercial product, the lead is 10mm, the positioning accuracy is 0.025mm, and the bearing capacity is 6620kg.
The bevel gear I32 and the bevel gear II 33 are meshed to generate transmission, and the reduction ratio is 1:2.
The precise centering adjustment of the thick pinhole collimator 60 in the invention ensures that the reference light passes through the center of the tail support mechanism of the thick pinhole collimator by adjusting the corresponding adjusting mechanism of the tail support until the far-end diffraction light ring meets the test requirement.
The precise adjustment is realized by moving the front-back Y-axis adjusting mechanism and the Z-axis adjusting mechanism, so that the thick pinhole collimator is arbitrarily centered in the space of the X-axis direction.
In the adjusting process of the space state of the thick pinhole collimator 60, the rotation center of the plane spherical hinge mechanism is used as a fixed selection point, the projection length of the thick pinhole collimator 60 in the plane direction is lengthened or shortened in the adjusting process, the pressing block 28 on the tail of the device adopts spring pre-tightening and an arc supporting plane, interference is avoided, the occurrence of small internal stress change is ensured, the thick pinhole collimator 60 is prevented from drifting after state setting, and the stability requirement of the technical state is ensured.
The Y-axis adjusting mechanism adopts a commercial linear module 2 to form a main moving part, meanwhile, in order to achieve better adjusting hand feeling for self-locking and adjustment of the linear module 2, a driving part of the linear module 2 is formed by a driving hand wheel II 41 and a harmonic reducer II 43, and the good self-locking performance of the Y-axis moving mechanism is ensured by adding the harmonic reducer II 43 with a large reduction ratio.
The Z-axis adjusting mechanism adopts a combination mode of a precise screw rod 6 and a screw rod nut 7 to form a lifting unit with a self-locking function, adopts a high-precision guide slide rail 12 and a Z-axis movable connecting seat 8 to form a screw rod nut 7 guide unit, and drives a hand wheel I5 and a reversing gear assembly to form a Z-axis manual driving module.
In the power transmission process of the precise screw rod 6, the precise screw rod 6 is always used under the vertical condition, and the precise screw rod 6 and the screw rod nut 7 are always in a pressed state, so that the rotation clearance of the precise screw rod 6 and the screw rod nut 7 can not influence the accuracy of system transmission.
The driving part of the Z-axis adjusting mechanism adopts a structure mode of matching a gear set with a larger driving hand wheel I5, smaller displacement adjusting response precision is met, and the positioning precision of the Z-axis moving mechanism can be improved by increasing the size of the driving hand wheel I5.
The inner frame and the outer frame in the plane spherical hinge mechanism form a cross shaft, two degrees of freedom rotation space shafts are formed on a plane, the dimensional accuracy and the error of two orthogonal axes of the cross are not related to each other, the radial runout is small only when the plane spherical hinge mechanism rotates at a small angle, a double-cone roller bearing is adopted as a main body of a structural support, bearing covers at two ends are utilized for pre-tightening, the radial runout with higher accuracy can be obtained, and the rigidity of 2 rotating shafts in the plane spherical hinge structure is improved by installing the cone roller bearings face to face.
The tail pressing seat mechanism is a locking device of the thick pinhole collimator adjusting mechanism, in order to facilitate the installation and debugging of the thick pinhole collimator 60, a spring pre-tightening and arc supporting surface mode is adopted at the tail, interference during the adjustment of the thick pinhole collimator is avoided, the space state of the thick pinhole collimator 60 after adjustment and fixation is prevented from drifting, the clearance between the supporting block 23 and the tail supporting surface of the thick pinhole collimator 60 adopts medium precision tolerance fit to ensure that a trace clearance can be provided when the tail supporting surface of the thick pinhole collimator 60 rotates around a plane spherical hinge, the clearance is provided by a pre-pressed spring I26 and a pre-pressed spring II 27, and the clearance is locked by a screw after the adjustment is finished.
The upper press block 28 in the tail pressing seat mechanism is provided with a spring reset mechanism, so that the thick pinhole collimator can slide along the X axis by a small amount, and a large pre-pressure is always used for pressing the thick pinhole collimator 60 onto the plane spherical hinge mechanism, thereby avoiding the drift of light spots in a locking state.
It should be noted that the foregoing illustrates some of the principles of the heavy duty precision centering adjustment device of the thick pinhole collimator of the present invention. The description is not intended to limit the heavy duty precision centering adjustment device of the thick pinhole collimator of the invention to the specific structure and application scope shown and described, so all the corresponding modifications and equivalents that may be utilized are within the scope of the patent claims filed herewith.
Claims (5)
1. The heavy-duty precise centering adjusting device for the thick pinhole collimator is characterized by comprising a Y-axis adjusting mechanism I (101), a Y-axis adjusting mechanism II (102), a Z-axis adjusting mechanism I (103), a Z-axis adjusting mechanism II (104), a plane spherical hinge mechanism, a tail pressing seat mechanism, the thick pinhole collimator (60) and a mounting bottom plate (70); the connection relation is that the Z-axis adjusting mechanism I (103) is positioned right above the Y-axis adjusting mechanism I (101); the Z-axis adjusting mechanism II (104) is positioned right above the Y-axis adjusting mechanism II (102); the plane spherical hinge mechanism is positioned right above the Z-axis adjusting mechanism I (103); the tail pressing seat mechanism is positioned right above the Z-axis adjusting mechanism II (104); the mounting bottom plate (70) is fixed on the ground; the Y-axis adjusting mechanism I (101), the Z-axis adjusting mechanism I (103) and the plane spherical hinge mechanism are combined to form a front end support of the thick pinhole collimator; the Y-axis adjusting mechanism II (102), the Z-axis adjusting mechanism II (104) and the tail pressing seat mechanism are combined to form a tail end support of the thick pinhole collimator (60); the front end support and the tail end support of the thick pinhole collimator (60) are respectively fixed at two ends of the mounting bottom plate and are centrosymmetric; the front end of the thick pinhole collimator (60) is fixed at the center of the plane spherical hinge mechanism, and the tail end of the thick pinhole collimator (60) is connected with the tail pressing seat mechanism; the heavy-load precise centering adjusting device is positioned on the pinhole photographic light path; the Y-axis adjusting mechanism I (101) comprises a linear module (2), a slide seat connecting plate (3), a Y-axis fixed connecting seat (47), a coupler (45), a connecting shaft I (42), a harmonic reducer II (43), a connecting shaft II (44), a driving hand wheel II (41) and a protecting plate (46); the connection relation is that the base of the linear module (2) is fixed at one end of the installation bottom plate (70); a slide seat connecting plate (3) is arranged on the slide seat of the linear module (2); the driving shaft end of the linear module (2) is provided with a Y-axis fixed connecting seat (47), and the center of the Y-axis fixed connecting seat (47) coincides with the center of the driving shaft of the linear module (2); the harmonic reducer II (43) is fixed on the Y-axis fixed connecting seat (47), one end of the harmonic reducer II (43) stretches into the upper cavity of the Y-axis fixed connecting seat (47) and is fixed with the driving shaft of the linear module (2) sequentially through the connecting shaft II (44) and the coupler (45), and the other end of the harmonic reducer II (43) is fixed with the driving hand wheel II (41) through the connecting shaft I (42); the protection plate (46) is fixed on the Y-axis fixed connecting seat (47); the Y-axis fixed connecting seat (47), the coupler (45), the connecting shaft I (42), the harmonic reducer II (43), the connecting shaft II (44) and the driving hand wheel II (41) are coaxially arranged; the structure of the Y-axis adjusting mechanism II (102) is the same as that of the Y-axis adjusting mechanism I (101); the Z-axis adjusting mechanism I (103) comprises an inner supporting frame (4), a precise screw rod (6), a screw rod nut (7), a Z-axis movable connecting seat (8), a movable frame I (91), a tapered roller bearing I (10), a bearing gland I (11), a guide sliding rail (12), a guide sliding block (13), a dust-proof plate (30), a tapered roller bearing IV (31), a bevel gear I (32), a bevel gear II (33), a nut (34), an angular contact bearing (35), a Z-axis fixed connecting seat (36), a harmonic reducer I (37), an input shaft (38), a reducer baffle (39), an output shaft (40) and a driving hand wheel I (5); the connection relation is that the inner supporting frame (4) and the movable frame I (91) are mutually sleeved and embedded to form a supporting body of the Z-axis adjusting mechanism I (103); the inner supporting frame (4) is fixed on a sliding seat connecting plate (3) of the Y-axis adjusting mechanism I (101); a guide sliding rail (12) and a guide sliding block (13) are arranged between the inner supporting frame (4) and the movable frame I (91), the guide sliding rail (12) is fixed at the center position of the outer end face of the inner supporting frame (4), and the guide sliding block (13) is fixed at the center position of the inner end face of the movable frame I (91); the center of the inner supporting frame (4) is provided with a Z-axis transmission mechanism consisting of a precise screw rod (6), a screw rod nut (7), a Z-axis movable connecting seat (8) and a bevel gear I (32), the precise screw rod (6) rotates around the Z axis, and the screw rod nut (7) moves up and down along the precise screw rod; the precise screw rod (6) is assembled with the inner supporting frame (4) through a tapered roller bearing I (10) and a tapered roller bearing IV (31) and is pressed and fixed by a bearing gland I (11), and the lower end of the precise screw rod (6) penetrates through a fixing surface of the inner supporting frame (4) to be fixedly connected with a bevel gear I (32); the screw nut (7) is fixedly connected with the movable frame (91) through a Z-axis movable connecting seat (8) and is used for enabling the movable frame (91) to move up and down along the Z axis; the center of the outer side of the inner supporting frame (4) is provided with a Z-axis fixed connecting seat (36); the center of the Z-axis fixed connecting seat (36) is provided with a Z-axis driving mechanism consisting of a harmonic speed reducer I (37), an input shaft (38), a speed reducer baffle (39), an output shaft (40), a driving hand wheel I (5), a bevel gear II (33), a nut (34) and an angular contact bearing (35); the harmonic reducer I (37) is fixed on the boss end face of the Z-axis fixed connecting seat (36) through a reducer baffle (39), one end of the harmonic reducer I (37) is fixedly connected with the driving hand wheel I (5) through an input shaft (38), and the other end of the harmonic reducer I (37) is fixedly connected with the bevel gear II (33) through an output shaft (40); the output shaft (40) is assembled with the Z-axis fixed connecting seat (36) through a centripetal angular contact bearing (35) and is fixedly connected with the Z-axis fixed connecting seat through a nut (34); the bevel gear II (33), the output shaft (40), the harmonic reducer I (37), the input shaft (38), the driving hand wheel I (5) and the reducer baffle (39) are coaxially arranged; the bevel gear I (32) is meshed with the bevel gear II (33) for transmission; a dust-proof plate (30) is arranged at the opening of the movable frame (91); the structure of the Z-axis adjusting mechanism II (104) is the same as that of the Z-axis adjusting mechanism I (103);
the plane spherical hinge mechanism comprises a hinge seat main body (14), an outer frame (15), a bearing gland II (16), a tapered roller bearing II (17), a supporting shaft I (18), an inner frame (19), a bearing gland III (20), a tapered roller bearing III (21) and a supporting shaft II (22), wherein the center of the inner frame (19) is a round hole; the connection relation is that the hinged support main body (14) is fixedly connected to a movable frame I (91) in the Z-axis adjusting mechanism I (103); the outer frame (15) is assembled with the hinged support main body (14) through the supporting shaft I (18) and the tapered roller bearing II (17) and is pressed and fixed by the bearing gland II (16), and the outer frame (15) is used for rotating around the supporting shaft I (18) in the Y-axis direction; the inner frame (19) is assembled with the outer frame (15) through a support shaft II (22) and a tapered roller bearing III (21) and is pressed and fixed by a bearing cover III (22), and the inner frame (19) is used for rotating around the support shaft II (22) in the Z-axis direction;
the tail seat pressing mechanism comprises a supporting block (23), a spherical pressing block (24), a guide screw (25), a spring I (26), a spring II (27), an upper pressing block (28) and a pressing ring (29), wherein the center of the supporting block (23) is a U-shaped opening, and the opening is right above; the spherical pressing block (24) is square in shape, a round hole is formed in the center, and the front end face is an arc surface; the upper pressing block (28) is T-shaped, and the convex lower end surface is a cylindrical surface; the connection relation is that the supporting block (23) is fixed on the upper end surface of a movable frame II (92) in a Z-axis adjusting mechanism II (104); four vertex angles of the spherical pressing block (24) are provided with spring reset mechanisms consisting of guide screws (25) and springs I (26), and the spherical pressing block (24) is fixed on the outer side of the supporting block (23) through the spring reset mechanisms; the guide screw (25) penetrates through a guide hole of the spherical pressing block (24) to be fixed at the center of the supporting block; the upper pressing block (28) is fixed on the upper end face of the supporting block (23), the protruding lower end of the upper pressing block is matched with the U-shaped opening of the supporting block (23), and spring reset mechanisms consisting of springs II (27) and compression rings (29) are arranged at two ends of the top surface of the upper pressing block (28); the compression ring (29) passes through a guide hole of the upper pressing block (28) and is fixed on the upper end surface of the supporting block (23); the spherical pressing blocks (24) and the upper pressing blocks (28) are respectively provided with through holes which are locked with the supporting blocks (23) and used for locking after the adjustment is completed.
2. The heavy-duty precise centering adjustment device of the thick pinhole collimator according to claim 1, wherein the reduction ratio of the harmonic reducer II (43) is 1:50.
3. The heavy-duty precise centering adjustment device of the thick pinhole collimator according to claim 1, wherein the front end cylindrical outer surface of the thick pinhole collimator (60) is matched with the circular hole inner surface in the center of the inner frame (19).
4. The heavy-duty precise centering adjustment device of the thick pinhole collimator according to claim 1, wherein the outer surface of a rear end cylinder of the thick pinhole collimator (60) is matched with the inner surface of a round hole in the center of the supporting block (23); the rear end spherical surface of the thick pinhole collimator (60) is matched with the spherical surface of the spherical pressing block (24); the outer surface of the rear end cylinder of the thick pinhole collimator (60) is matched with the lower end of the upper pressing block (28) by a cylindrical surface.
5. The heavy-duty precise centering adjustment device of the thick pinhole collimator according to claim 1, wherein the bevel gear I (32) is matched with the bevel gear II (33).
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| CN201711095053.6A CN107727673B (en) | 2017-11-09 | 2017-11-09 | Heavy-load precise centering adjusting device for thick pinhole collimator |
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| CN109737143B (en) * | 2019-02-19 | 2020-03-31 | 北京永新医疗设备有限公司 | Centering bearing seat device |
| CN111791179B (en) * | 2020-07-31 | 2021-02-09 | 佛山原子医疗设备有限公司 | Barrel-shaped pinhole collimator installation device of nuclear medical equipment |
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| WO2007109227A2 (en) * | 2006-03-17 | 2007-09-27 | The Trustees Of The University Of Pennsylvania | Slit-slat collimation |
| CN101603928A (en) * | 2008-06-12 | 2009-12-16 | 清华大学 | The adjusting locating device that is used for radiation appliance |
| CN201562466U (en) * | 2009-12-24 | 2010-08-25 | 同方威视技术股份有限公司 | Collimating slit adjusting mechanism for collimator and collimator |
| WO2014033489A1 (en) * | 2012-08-30 | 2014-03-06 | Mediso Orvosi Berendezés Fejlesztö És Szerviz Kft. | Imaging apparatus, an aperture for the imaging apparatus and a method for manufacturing an aperture of an imaging apparatus |
| NL2010267C2 (en) * | 2013-02-07 | 2014-08-11 | Milabs B V | High energy radiation detecting apparatus and method. |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103876767B (en) * | 2013-12-19 | 2017-04-12 | 沈阳东软医疗***有限公司 | CT (computed tomography) machine and X-ray collimator thereof |
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|---|---|---|---|---|
| WO2007109227A2 (en) * | 2006-03-17 | 2007-09-27 | The Trustees Of The University Of Pennsylvania | Slit-slat collimation |
| CN101603928A (en) * | 2008-06-12 | 2009-12-16 | 清华大学 | The adjusting locating device that is used for radiation appliance |
| CN201562466U (en) * | 2009-12-24 | 2010-08-25 | 同方威视技术股份有限公司 | Collimating slit adjusting mechanism for collimator and collimator |
| WO2014033489A1 (en) * | 2012-08-30 | 2014-03-06 | Mediso Orvosi Berendezés Fejlesztö És Szerviz Kft. | Imaging apparatus, an aperture for the imaging apparatus and a method for manufacturing an aperture of an imaging apparatus |
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