CN211599979U

CN211599979U - Positioning and mounting device for CT detector module

Info

Publication number: CN211599979U
Application number: CN201922233125.XU
Authority: CN
Inventors: 马兴江; 金坚诚; 陶丰盛; 王强
Original assignee: Ningbo Aimert Medical Imaging Technology Co ltd
Current assignee: Minfound Medical Systems Co Ltd
Priority date: 2019-12-13
Filing date: 2019-12-13
Publication date: 2020-09-29
Anticipated expiration: 2029-12-13

Abstract

The utility model discloses a location and installation device of CT detector module, including detector module, arc guide rail and bottom plate, the upper surface of bottom plate is equipped with boss one and is used for the installation the boss two of arc guide rail, be equipped with the navigation key on the arc guide rail, be equipped with in the detector module with navigation key complex constant head tank. The utility model is provided with the positioning key corresponding to the detector module on the arc-shaped guide rail as the main positioning for controlling the positioning precision between the adjacent modules and preventing the detector module from rotating when being installed, thereby ensuring the uniformity of the clearance; the bottom plate is provided with the positioning boss for positioning in the Z direction, so that tolerance elements are simplified, and machining and precision are easier to control. The utility model discloses simple structure, simple to operate, the installation accuracy is high.

Description

Positioning and mounting device for CT detector module

Technical Field

The utility model relates to a medical imaging equipment technical field, more specifically relate to a location and installation device of CT detector module.

Background

The CT detector is formed by mounting a plurality of detector modules on an arc-shaped or polygonal guide rail bracket. When the CT imaging system works, X rays are emitted from a bulb tube of the CT machine, are limited by the beam limiter to form a conical light beam, and the conical light beam irradiates the detector, is converted into photoelectric signals by the detector, and generates a CT image after a series of processing and image reconstruction and correction algorithms. Therefore, the positioning accuracy of the module of each module is important, and when the time position of the module deviates greatly from the theoretical position, various artifacts such as blurring, streaking, banding, aliasing, and the like may be generated in the CT image.

The existing detector modules are usually positioned by two pins, and because the two pins can simultaneously generate constraint along the tangential direction of the arc-shaped guide rail (see fig. 1), the gap between the two detector modules is often uneven due to processing errors. When the positioning pin is used for positioning in the Z direction (see figure 1), more error factors (six tolerance factors including bottom plate bottom surface flatness 21, bottom plate bottom surface parallelism 22 and distance 23 of the arc-shaped guide rail mounting surface, pin hole position 24 on the guide rail, hole pin floating gap 25 and pin hole position 26 on the detector base) are introduced into a Z-direction tolerance chain (see figure 2), more factors need to be controlled during processing, the processing precision requirement is high, the cost is increased, and once Z-direction over-tolerance is found, compensation adjustment cannot be carried out.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art, the utility model provides a location and installation device of CT detector module, convenient operation, the installation accuracy is high.

In order to achieve the above purpose, the utility model provides a following technical scheme: the utility model provides a location and installation device of CT detector module, includes detector module, arc guide rail and bottom plate, the upper surface of bottom plate is equipped with boss one and is used for the installation arc guide rail's boss two, be equipped with the navigation key on the arc guide rail, be equipped with on the detector module with navigation key complex constant head tank.

The boss sets up along the circumferencial direction of base, be located the inboard of base, when installing the detector module, earlier with the bottom plate, arc guide rail and navigation key accomplish the assembly in advance, then aim at the lower part of navigation key with the lower part of the constant head tank that sets up on the detector module and push into, make the navigation key fall into the constant head tank, then promote the detector module downwards, make the bottom surface of detector module and the boss one contact that sets up on the bottom plate and make it compress tightly on boss one, use the screw fastening at last, make two both ends of detector module and with the installation face one on the arc guide rail and install the face two contacts, accomplish the installation of detector module. The utility model discloses simple structure, simple to operate, positioning accuracy between the adjacent detector module of accurate control prevents that the detector module from rotating when the installation, guarantees the homogeneity in clearance.

Furthermore, a plurality of first installation surfaces and second installation surfaces matched with the detector modules are arranged on the arc-shaped guide rail along the circumferential direction of the arc-shaped guide rail, and first installation holes and second installation holes are formed in the first installation surfaces and the second installation surfaces respectively. The first mounting surface and the second mounting surface are respectively arranged on the upper side and the lower side of the arc-shaped guide rail and used for mounting the detector module. The included angle value between every two adjacent mounting surfaces I or two is determined according to the optical geometry of the cone beam, and the intersection line of the normal planes of the mounting surfaces I and the mounting surfaces II is overlapped with the center of the cone beam, so that the mounting accuracy of the detector module can be ensured, and the image quality is improved.

Furthermore, the first mounting hole is a waist-shaped hole along the width direction of the arc-shaped guide rail, so that a certain adjusting space can be provided during mounting, and the requirement on the machining precision of parts is reduced.

Furthermore, the extraction central plane of the first mounting hole coincides with the normal plane of the first mounting surface, so that the mounting accuracy is guaranteed.

Furthermore, the distance between the geometric center point of the positioning groove and the bottom surface of the detector module is matched with the distance between the geometric center point of the positioning key and the first boss after the arc-shaped guide rail and the bottom plate are assembled. Realize accurate location through constant head tank and navigation key cooperation, prevent installation error.

Furthermore, the positioning groove is arranged to be a waist-shaped hole along the width direction of the detector module, and the length of the waist-shaped hole is slightly larger than that of the positioning key, so that a certain assembling and adjusting space is provided, and the requirement on processing precision is reduced.

Furthermore, the boss II is discontinuously arranged on the bottom plate, and the plurality of boss II are discontinuously arranged on the bottom plate and used for installing the arc-shaped guide rail.

To sum up, the utility model is provided with the positioning key corresponding to the detector module on the arc-shaped guide rail as the main positioning for controlling the positioning precision between the adjacent modules and preventing the detector module from rotating when being installed, thereby ensuring the uniformity of the gap; the bottom plate is provided with the positioning boss for positioning in the Z direction, so that tolerance elements are simplified, and machining and precision are easier to control. The utility model discloses simple structure, simple to operate, the installation accuracy is high.

Drawings

FIG. 1 is a schematic view of an arc-shaped guide rail structure;

FIG. 2 is a schematic diagram of a tolerance chain of a prior art pin positioning scheme affecting Z-direction accuracy;

FIG. 3 is a schematic diagram of a tolerance chain of the positioning scheme of the present invention affecting Z-direction accuracy;

fig. 4 is an exploded view of the embodiment of the present invention;

FIG. 5 is a schematic view of a bottom plate structure according to an embodiment of the present invention;

fig. 6 is a schematic structural view of an arc-shaped guide rail according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a detector module according to an embodiment of the present invention;

fig. 8 is a schematic structural section view of an embodiment of the present invention.

Description of the labeling: 1. a base plate; 2. mounting surfaces II; 3. a first boss; 4. an arc-shaped guide rail; 5. a positioning key; 6. a first mounting surface; 7. positioning a groove; 8. a detector module; 9. a first mounting hole; 10. and a second mounting hole.

Detailed Description

An embodiment of a positioning and mounting device for a CT detector module according to the present invention is further described with reference to fig. 1 to 8.

The utility model provides a location and installation device of CT detector module, includes detector module 8, arc guide rail 4 and bottom plate 1, the upper surface of bottom plate 1 is equipped with boss one 3 and is used for the installation the boss two of arc guide rail 4, be equipped with navigation key 5 on the arc guide rail 4, be equipped with on the detector module 8 with navigation key 5 complex constant head tank 7.

As shown in FIG. 5, the first bosses 3 are arranged along the circumferential direction of the base and are positioned on the inner side of the base, and the positioning keys 5 can be flat keys. When the detector module 8 is installed, as shown in fig. 8, the bottom plate 1, the arc-shaped guide rail 4 and the positioning key 5 are assembled in advance, then the lower part of the positioning groove 7 arranged on the detector module 8 is pushed into the lower part of the positioning key 5 in an aligning mode, the positioning key 5 falls into the positioning groove 7, then the detector module 8 is pushed downwards, the bottom surface of the detector module 8 is made to be in contact with the boss I3 arranged on the bottom plate 1 and is made to be pressed on the boss I3, finally, the detector module 8 is fastened through screws, two ends of the detector module 8 are made to be in contact with the installation surface I6 and the installation surface II 2 on the arc-shaped guide rail 4, and installation of the detector module 8. The utility model discloses simple structure, simple to operate, positioning accuracy between the adjacent detector module 8 of accurate control prevents that detector module 8 from rotating when the installation, guarantees the homogeneity in clearance.

As shown in fig. 3, the present invention directly uses the upper surface of the bottom plate 1 as the second positioning surface to position the Z-direction, so that the Z-direction tolerance chain can be simplified to the bottom surface flatness 41 of the bottom plate 1, and the positioning surface has three tolerance elements including the bottom surface parallelism 42 and the distance 43, and the processing and precision are easier to control.

As shown in fig. 4 and 6, a plurality of mounting surfaces first 6 and second mounting surfaces second 2 matched with the detector module 8 are arranged on the arc-shaped guide rail 4 along the circumferential direction of the arc-shaped guide rail, and mounting holes first 9 and mounting holes second 10 are respectively arranged on the mounting surfaces first 6 and the mounting surfaces second 2. The first mounting surface 6 and the second mounting surface 2 are respectively arranged on the upper side and the lower side of the arc-shaped guide rail 4 and used for mounting the detector module 8. The included angle value between each adjacent mounting surface I6 or mounting surface II 2 is determined according to the optical geometry of the cone beam, and the intersection line of the normal plane of each mounting surface I6 and the normal plane of each mounting surface II 2 coincides with the center of the cone beam, so that the mounting accuracy of the detector module 8 can be guaranteed, and the image quality is improved.

As shown in fig. 7, the first mounting hole 9 is a waist-shaped hole along the width direction of the arc-shaped guide rail 4, so that a certain adjustment space can be provided during mounting, and the requirement on the machining precision of parts is reduced.

Preferably, in this embodiment, the extraction center plane of the first mounting hole 9 coincides with the normal plane of the first mounting surface 6, so as to ensure the mounting accuracy.

Preferably, in this embodiment, the distance between the geometric center point of the positioning slot 7 and the bottom surface of the detector module 8 is matched with the distance between the geometric center point of the positioning key 5 and the first boss 3 after the arc-shaped guide rail 4 and the bottom plate 1 are assembled. Realize accurate location through constant head tank 7 and the cooperation of navigation key 5, prevent installation error.

In this embodiment, preferably, the positioning slot 7 is a waist-shaped hole along the width direction of the detector module 8, and the length of the waist-shaped hole is slightly greater than that of the positioning key 5, so as to provide a certain assembly adjustment space and reduce the requirement for processing precision.

Preferably, the second bosses are discontinuously arranged on the base plate 1, and the second bosses are discontinuously arranged on the base plate 1 and used for mounting the arc-shaped guide rail 4.

It is above only the utility model discloses a preferred embodiment, the utility model discloses a scope of protection does not only confine above-mentioned embodiment, the all belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope of protection. It should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. The utility model provides a CT detector module's location and installation device which characterized in that: the detector comprises a detector module, an arc-shaped guide rail and a bottom plate, wherein a first boss and a second boss are arranged on the upper surface of the bottom plate, the first boss is used for installation, a positioning key is arranged on the arc-shaped guide rail, and a positioning groove matched with the positioning key is arranged on the detector module.

2. The apparatus for positioning and mounting a CT detector module as claimed in claim 1, wherein: the arc-shaped guide rail is provided with a plurality of first mounting surfaces and second mounting surfaces which are matched with the detector modules along the circumferential direction of the arc-shaped guide rail, and the first mounting surfaces and the second mounting surfaces are respectively provided with first mounting holes and second mounting holes.

3. The apparatus for positioning and mounting a CT detector module as claimed in claim 2, wherein: the first mounting hole is a waist-shaped hole along the width direction of the arc-shaped guide rail.

4. The apparatus for positioning and mounting a CT detector module as claimed in claim 3, wherein: and the extraction central plane of the first mounting hole is superposed with the normal plane of the first mounting surface.

5. The apparatus for positioning and mounting a CT detector module as claimed in claim 1, wherein: and the distance between the geometric center point of the positioning groove and the bottom surface of the detector module is matched with the distance between the geometric center point of the positioning key and the first boss after the arc-shaped guide rail and the bottom plate are assembled.

6. The apparatus for positioning and mounting a CT detector module as claimed in claim 5, wherein: the positioning groove is arranged to be a waist-shaped hole along the width direction of the detector module.

7. The apparatus for positioning and mounting a CT detector module as claimed in claim 1, wherein: the boss two is discontinuously arranged on the bottom plate.