CN107807137A - Preceding collimater and scanning imagery equipment - Google Patents

Abstract

The invention relates to a front collimator and scanning imaging equipment. The front collimator includes: a shading assembly, including a first shading member and a second shading member arranged side by side and spaced apart from the first shading member, and a collimation slit is formed between the first shading member and the second shading member; a driving assembly, including The first transmission part connected with the first shading part, the second transmission part connected with the second shading part and the driving part connected with the first transmission part and the second transmission part; the driving part passes through the first transmission part and the second transmission part. The second transmission part respectively drives the first light-shielding member and the second light-shielding member to perform linear motions in opposite directions to move closer to or farther away from each other, so as to adjust the width of the collimation slit. The front collimator of this embodiment has a structure that can adjust the width of the collimation slit, so that the width of the collimation slit can be adjusted according to actual application conditions, and the scanning thickness can be changed. The front collimator has versatility and strong adaptability, and the overall operation is simple and convenient, which improves work efficiency and reduces use costs.

Description

Front collimator and scanning imaging equipment

technical field

The invention relates to the technical field of radiation detection, in particular to a front collimator and scanning imaging equipment.

Background technique

Scanning imaging equipment has the advantage of being able to detect the inside of an object without touching the object, and will not cause physical damage to the object to be detected, so it is widely used in industrial production or object scanning in daily life. Scanning imaging devices typically have a detection module. The detection module includes a front collimator. The front collimator can determine the scanning slice thickness.

After long-term observation, research and analysis, the applicant found that the slits provided on the front collimator in the prior art cannot be adjusted. For the front collimator whose slit size cannot be adjusted, because it does not have universality, it can only meet different detection requirements by replacing the front collimator with different slit width, which is cumbersome and increases the cost of use.

Contents of the invention

Embodiments of the present invention provide a front collimator and a scanning imaging device. The front collimator of this embodiment has a structure that can adjust the width of the collimation slit, so that the width of the collimation slit can be adjusted according to actual application conditions, and the scanning thickness can be changed. In this way, the front collimator of this embodiment has versatility and strong adaptability, and the overall operation is simple and convenient, which improves work efficiency and reduces use cost.

On the one hand, according to an embodiment of the present invention, a front collimator is provided for scanning an imaging device, which includes: a shading assembly, including a first shading member and a second shading member arranged side by side and spaced apart from the first shading member. A collimated slit is formed between the first shading member and the second shading member; the driving assembly includes a first transmission part connected with the first shading member, a second transmission part connected with the second shading member, and a first transmission part connected with the first shading member. The driving part connected with the second transmission part; the driving part respectively drives the first shading part and the second shading part through the first transmission part and the second transmission part to make linear motions close to or far away from each other in opposite directions to adjust The width of the collimation slit.

According to an aspect of the embodiment of the present invention, the rotation of the first transmission part and the second transmission part drives the first light-shielding member and the second light-shielding member to approach or move away from each other.

According to an aspect of the embodiments of the present invention, the driving assembly includes a transmission shaft, and the first transmission part and the second transmission part are threaded segments coaxially arranged on the transmission shaft and in opposite directions of rotation.

According to an aspect of the embodiment of the present invention, the first shading member includes a first connection portion, the second shading member includes a second connection portion, the first transmission portion is screwed to the first connection portion, and the second transmission portion is connected to the second connection portion threaded connection.

According to an aspect of the embodiment of the present invention, the first shading member further includes a first shaft sleeve disposed on the first connecting portion, the second shading member further includes a second shaft sleeve disposed on the second connecting portion, and the first shaft The sleeve and the second shaft sleeve are threadedly connected with the first transmission part and the second transmission part respectively.

According to an aspect of the embodiment of the present invention, the drive assembly further includes a first limiter and a second limiter connected to the transmission shaft, and the first transmission part and the second transmission part are arranged on the first limiter and the second limiter. between the limit pieces.

According to an aspect of the embodiment of the present invention, the front collimator further includes a fixed block, the fixed block is arranged between the first transmission part and the second transmission part, and the transmission shaft is rotatably connected to the fixed block.

According to an aspect of the embodiment of the present invention, the fixing block includes a through hole perpendicular to the alignment slit, and the transmission shaft is clearance-fitted with the through hole to realize rotatable connection with each other.

According to an aspect of an embodiment of the present invention, the first shading member includes a first support and a first tungsten-iron-nickel plate disposed on the first support, and the second shading member includes a second support and a first tungsten-iron-nickel plate disposed on the second support. The second tungsten-iron-nickel plate on the top, the first transmission part is connected with the first support, the second transmission part is connected with the second support, and a quasi- Slit straight.

According to an aspect of the embodiment of the present invention, there are two driving assemblies and they are respectively disposed on opposite sides of the light shielding assembly along the extending direction of the collimating slit.

According to the front collimator provided by the embodiment of the present invention, it includes a movable first shading member and a second shading member. Adjusting the relative position of the first shading member and the second shading member by the drive unit to adjust the width of the collimation slit formed between the first shading member and the second shading member to meet the requirements of different scanning thicknesses, thus this embodiment The front collimator is versatile, and it is no longer necessary to frequently replace the front collimator with different slit widths to meet the requirements of different scanning thicknesses. The collimation slit adjustment process of the front collimator is simple and easy to operate, which improves work efficiency and reduces labor intensity and use cost.

In another aspect, according to an embodiment of the present invention, a scanning imaging device is provided, which includes: a fixed bracket and an optical-mechanical assembly arranged on the fixed bracket; as the above-mentioned front collimator, the front collimator is connected to the fixed bracket and Set on the light output path of the optomechanical assembly.

Description of drawings

The features, advantages, and technical effects of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.

Fig. 1 is the structural representation of the front collimator of an embodiment of the present invention;

Fig. 2 is a schematic diagram of the use state of the front collimator in the scanning imaging device according to the embodiment of the present invention;

Fig. 3 is a partial enlarged view of A in Fig. 2 .

In the drawings, the drawings are not drawn to scale.

Detailed ways

Embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings and examples. The detailed description and drawings of the following embodiments are used to illustrate the principle of the present invention, but not to limit the scope of the present invention, that is, the present invention is not limited to the described embodiments.

In the description of the present invention, it should be noted that unless otherwise specified, the meaning of "plurality" is two or more; the terms "upper", "lower", "left", "right", "inner ", "outside" and other indicated orientations or positional relationships are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation of the invention. In addition, the terms "first", "second", etc. are used for descriptive purposes only, and should not be construed as indicating or implying relative importance.

In the description of the present invention, it should also be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be interpreted in a broad sense, for example, it can be a fixed connection or a flexible connection. Disassembled connection, or integral connection; it can be directly connected or indirectly connected through an intermediary. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

In order to better understand the present invention, the front collimator of the embodiment of the present invention will be described in detail below with reference to FIG. 1 and FIG. 3 .

FIG. 1 schematically shows the structure of a front collimator 100 . As shown in FIG. 1 , the front collimator 100 of the embodiment of the present invention is used for scanning imaging equipment, and can adjust the scanning thickness. The front collimator 100 of this embodiment has a structure that can adjust the width of the collimation slit, so that the width of the collimation slit can be adjusted according to actual application conditions, and the scanning thickness can be changed. In this way, the front collimator 100 of this embodiment has versatility and strong adaptability, and the overall operation is simple and convenient, which improves work efficiency and reduces use cost.

The front collimator 100 of the embodiment of the present invention includes a light shielding assembly 1 and a driving assembly 2 . Scanning imaging devices typically use an X-ray machine to generate scanning light. The front collimator 100 is arranged on the path of light propagation, and filters out most of the light through the shading assembly 1 to keep the effective part of the light passing through the shading assembly 1 for scanning.

The shading assembly 1 of this embodiment includes a first shading member 11 and a second shading member 12 . The first shading member 11 and the second shading member 12 are arranged side by side and at intervals. A collimating slit 13 is formed between the first light shielding member 11 and the second light shielding member 12 . The light generated by the optical machine can pass through the collimating slit 13 to scan the object to be scanned. The width of the collimating slit 13 can control the dose of the light passing through and control the scanning thickness. The first shading member 11 and the second shading member 12 are independent and can move relative to each other to adjust the width of the collimating slit 13 .

The driving assembly 2 of this embodiment includes a first transmission part 21 , a second transmission part 22 and a driving part. The first transmission part 21 is connected with the first shade 11 . The second transmission part 22 is connected with the second shade 12 . The driving part is connected with the first transmission part 21 and the second transmission part 22 . The driving part respectively drives the first shading member 11 and the second shading member 12 through the first transmission part 21 and the second transmission part 22 to perform linear motions in opposite directions to make them approach or move away from each other, so as to adjust the width of the collimation slit 13 .

The front collimator 100 of the embodiment of the present invention includes a movable first shading member 11 and a second shading member 12 . Adjust the relative position of the first shading member 11 and the second shading member 12 through the drive unit to adjust the width of the collimation slit 13 formed between the first shading member 11 and the second shading member 12 to meet the requirements of different scanning thicknesses Therefore, the front collimator 100 of this embodiment has versatility, and it is no longer necessary to frequently replace the front collimator 100 with different slit widths to meet the requirements of different scanning thicknesses. The adjustment process of the collimation slit 13 of the front collimator 100 is simple and easy to operate, improves work efficiency, reduces labor intensity and use cost.

In this embodiment, the rotation of the first transmission part 21 and the second transmission part 22 drives the first shade 11 and the second shade 12 to approach or move away from each other. The first transmission part 21 includes a first axis of rotation. The first transmission part 21 is rotatable around the first rotation axis. The second transmission part 22 includes a second axis of rotation. The second transmission part 22 is rotatable about the second axis of rotation. The first transmission part 21 and the second transmission part 22 respectively drive the first light-shielding member 11 and the second light-shielding member 12 to perform linear motion through their own rotational motion. On the one hand, the overall structure of the front collimator 100 can be made compact and the overall volume is small. On the other hand, the transmission precision is high, and the adjustment precision of the width of the collimation slit 13 is improved. In one embodiment, the first transmission part 21 and the first shading member 11, the second transmission part 22 and the second shading member 12 are driven by rack and pinion, or the first transmission part 21 and the first shading member 11 , There is a screw transmission between the second transmission part 22 and the second shade 12 . Preferably, screw transmission is used between the first transmission part 21 and the first shade 11 , and between the second transmission part 22 and the second shade 12 .

Optionally, the drive assembly 2 includes a transmission shaft 23 . The first transmission part 21 and the second transmission part 22 are threaded segments coaxially arranged on the transmission shaft 23 and rotate in opposite directions. The first transmission part 21 and the second transmission part 22 are screwed to the first light shielding part 11 and the second light shielding part 12 respectively. The first axis of rotation coincides with the second axis of rotation. The first shade 11 and the second shade 12 move axially along the first rotation axis or the second rotation axis, respectively. The transmission between the first transmission part 21 and the first shade 11 , and between the second transmission part 22 and the second shade 12 is screw transmission. The driving part can drive the transmission shaft 23 to rotate, and the transmission shaft 23 can simultaneously drive the first transmission part 21 and the second transmission part 22 to rotate. The first transmission part 21 and the second transmission part 22 synchronously drive the first light-shielding member 11 and the second light-shielding member 12 to move linearly, thereby improving the accuracy and work efficiency of adjusting the width of the collimation slit 13 . The way of screw transmission is simple and easy to operate, and the manufacturing difficulty is low.

In one example, the drive shaft 23 is a screw. The first transmission part 21 and the second transmission part 22 are coaxial and arranged at intervals along the axial direction of the screw. When the first transmission part 21 is a forward-rotation thread segment, the second transmission part 22 is a reverse-rotation thread segment, or, when the first transmission part 21 is a reverse-rotation thread segment, the second transmission part 22 is a forward-rotation thread segment. When the screw is driven to rotate by one end or the middle part of the screw, the screw respectively drives the first shading member 11 and the second shading member 12 to move linearly along the axial direction of the screw through the first transmission part 21 and the second transmission part 22, thereby Adjusting the width of the collimation slit 13 realizes stepless adjustment of the width of the collimation slit 13 and improves the versatility, adaptability and adjustment accuracy of the front collimator 100 .

Optionally, the first light-shielding member 11 and the second light-shielding member 12 may have a separate structure, which reduces the overall manufacturing difficulty of the first light-shielding member 11 and the second light-shielding member 12 . The first shade 11 and the second shade 12 respectively include a first connection portion 111 and a second connection portion 121 . Both the first connecting part 111 and the second connecting part 121 are independent structural parts. The first transmission part 21 and the second transmission part 22 are screwed to the first connection part 111 and the second connection part 121 respectively.

Optionally, the first shade 11 further includes a first sleeve 14 disposed on the first connecting portion 111 . The second shade 12 further includes a second sleeve 15 disposed on the second connecting portion 121 . The first shaft sleeve 14 and the second shaft sleeve 15 are screwed to the first transmission part 21 and the second transmission part 22 respectively. The first shaft sleeve 14 and the second shaft sleeve 15 are easy to disassemble and assemble, which is convenient for subsequent maintenance or replacement of related parts.

In one example, the first connecting portion 111 and the second connecting portion 121 are L-shaped plates. The first bushing 14 and the second bushing 15 are respectively arranged on the L-shaped plate.

The driving assembly 2 of this embodiment further includes a first limiting member 24 and a second limiting member 25 connected to the transmission shaft 23 . The first transmission part 21 and the second transmission part 22 are disposed between the first limiting part 24 and the second limiting part 25 . The first limiter 24 and the second limiter 25 are respectively used to limit the movement limit positions of the first shading member 11 and the second shading member 12, so as to avoid excessive movement of the first shading member 11 and the second shading member 12 It is disconnected from the first transmission part 21 and the second transmission part 22 . The first limiter 24 and the second limiter 25 can mark out the maximum value of the width of the collimation slit 13 .

In one example, the drive shaft 23 is a screw. Both the first limiting member 24 and the second limiting member 25 are retaining rings for the shaft. A ring groove is arranged on the screw rod, which is convenient for installing and fixing the shaft with a retaining ring. The first limiting member 24 and the second limiting member 25 are arranged at intervals along the axial direction of the screw. When the first shading member 11 and the second shading member 12 are in contact with the first limiting member 24 and the second limiting member 25 respectively, they cannot move further, and the width of the collimating slit 13 is at a maximum value. The adjustment range of the width of the collimation slit 13 in this embodiment is 0 mm to 15 mm.

The front collimator 100 of this embodiment further includes a fixing block 3 . The front collimator 100 can be conveniently and quickly connected with the external structure through the fixing block 3 . The fixing block 3 is disposed between the first transmission part 21 and the second transmission part 22 . The transmission shaft 23 is rotatably connected to the fixed block 3, and the fixed block 3 can rotate around the transmission shaft 23, which is convenient for flexibly adjusting the position of the fixed block 3 during the connection with the external structural parts and improving the assembly accuracy.

Optionally, the fixing block 3 includes a through hole perpendicular to the collimating slit 13 . The transmission shaft 23 is inserted into the through hole, and clearance fits with the through hole to realize mutual rotatable connection. The connection mode between the fixed block 3 and the transmission shaft 23 is simple and reliable, which is convenient for manufacturing and assembly. Screw holes are provided on the outer peripheral surface of the fixing block 3, which is convenient for directly connecting with external structural parts by screws.

The first shade 11 of this embodiment further includes a first support 112 and a first tungsten-iron-nickel plate 113 disposed on the first support 112 . The first seat 112 is provided with a first groove, and the first tungsten-iron-nickel plate 113 is seated on the first groove. The first tungsten-iron-nickel plate 113 can be connected and fixed to the first support 112 by screws and adhesives. The second shade 12 includes a second support 122 and a second WFeNi plate 123 disposed on the second support 122 . The second support 122 is provided with a second groove, and the second tungsten-iron-nickel plate 123 is seated on the second groove. The second tungsten-iron-nickel plate 123 can be connected and fixed to the second support 122 through screws and adhesives. Alignment slots 13 are formed between the first tungsten-iron-nickel plate 113 and the second tungsten-iron-nickel plate 123 . Optionally, the first light-shielding member 11 and the second light-shielding member 12 are plate-shaped structures as a whole.

In one example, the first support 112 and the second support 122 are respectively connected to the first transmission part 21 and the second transmission part 22 . Or, the first support 112 and the second support 122 are respectively connected with the first connection part 111 and the second connection part 121, and the first connection part 111 and the second connection part 121 are connected with the first transmission part 21 and the second connection part 121 respectively. The transmission part 22 is connected.

In this embodiment, there are two driving assemblies 2 and they are respectively disposed on opposite sides of the light shielding assembly 1 along the extending direction of the collimating slit 13 . The two driving assemblies 2 jointly adjust the collimation slit 13 , which can improve the positional stability of the first shading member 11 and the second shading member 12 during the adjustment process, and also improve the adjustment accuracy of the width of the collimation slit 13 . Preferably, the driving assembly 2 is used to drive the first shading member 11 and the second shading member 12 to move synchronously.

Fig. 2 schematically shows a partial structure of the scanning imaging device. With reference to FIG. 2 and FIG. 3 , an embodiment of the present invention also provides a scanning imaging device. The scanning imaging device includes a fixed bracket, an optomechanical assembly 4 arranged on the fixed bracket, and the front collimator 100 of the above-mentioned embodiment. The optomechanical assembly 4 is connected and fixed on the external installation base surface through a fixing bracket. The optomechanical assembly 4 includes a light generator, such as an X-ray machine. The front collimator 100 is connected with the fixed bracket and arranged on the light output path of the optical mechanical assembly 4 . Since the width of the collimation slit 13 of the front collimator 100 can be adjusted accordingly according to actual needs, the scanning imaging device has strong adaptability and good versatility.

In one example, the front collimator 100 is connected to the fixing bracket through the fixing block 3 . The fixing bracket is provided with a horizontal card slot, and the fixing block 3 is inserted into the horizontal card slot along the horizontal direction and fixed by screw connection.

While the invention has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for parts thereof without departing from the scope of the invention. In particular, as long as there is no structural conflict, the technical features mentioned in the various embodiments can be combined in any manner. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims (11)

1. A front collimator, used for scanning imaging equipment, is characterized in that, comprising: A shading assembly, comprising a first shading member and a second shading member arranged side by side and spaced apart from the first shading member, and a collimation slit is formed between the first shading member and the second shading member; A drive assembly, including a first transmission part connected to the first shading member, a second transmission part connected to the second shading member, and a drive connected to the first transmission part and the second transmission part department; The driving part respectively drives the first light-shielding member and the second light-shielding member to perform linear motions to move closer to or farther away from each other in opposite directions through the first transmission part and the second transmission part, so as to adjust the collimation slit width. 2 . The front collimator according to claim 1 , wherein the first transmission part and the second transmission part rotate to drive the first light-shielding member and the second light-shielding member to approach or move away from each other. 3 . 3. The front collimator according to claim 2, wherein the drive assembly comprises a transmission shaft, and the first transmission part and the second transmission part are coaxially arranged on the transmission shaft Threaded segments and opposite direction of rotation. 4. The front collimator according to claim 3, wherein the first shading member comprises a first connecting portion, the second shading member comprises a second connecting portion, and the first transmission portion is connected to the The first connecting part is threadedly connected, and the second transmission part is threadedly connected with the second connecting part. 5. The front collimator according to claim 4, wherein the first shading member further comprises a first shaft sleeve arranged on the first connecting portion, and the second shading member further comprises a set The second shaft sleeve on the second connecting portion, the first shaft sleeve and the second shaft sleeve are screwed to the first transmission portion and the second transmission portion respectively. 6. The front collimator according to any one of claims 3 to 5, wherein the drive assembly further comprises a first stopper and a second stopper connected to the drive shaft, so The first transmission part and the second transmission part are arranged between the first limiting part and the second limiting part. 7. The front collimator according to any one of claims 3 to 5, further comprising a fixed block, the fixed block is arranged between the first transmission part and the second transmission part, so The transmission shaft is rotatably connected with the fixed block. 8. The front collimator according to claim 7, wherein the fixed block includes a through hole perpendicular to the collimation slit, and the transmission shaft is clearance-fitted with the through hole to achieve mutual Turn to connect. 9. The front collimator according to any one of claims 1 to 5, wherein the first shading member comprises a first support and a first tungsten-iron-nickel disposed on the first support plate, the second shading member includes a second support and a second tungsten-iron-nickel plate arranged on the second support, the first transmission part is connected with the first support, and the first The second transmission part is connected with the second support, and the alignment slot is formed between the first tungsten-iron-nickel plate and the second tungsten-iron-nickel plate. 10. The front collimator according to any one of claims 1 to 5, characterized in that, there are two driving assemblies and they are respectively arranged on opposite sides of the light shielding assembly along the extending direction of the collimating slit sides. 11. A scanning imaging device, characterized in that it comprises: a fixed bracket and an optical-mechanical component arranged on the fixed bracket; The front collimator according to any one of claims 1 to 10, wherein the front collimator is connected to the fixing bracket and arranged on the light output path of the optical mechanical assembly.