WO2014172935A1

WO2014172935A1 - Movable ct scanner

Info

Publication number: WO2014172935A1
Application number: PCT/CN2013/076028
Authority: WO
Inventors: 徐如祥; 代秋声; 高枫; 张涛
Original assignee: 中国人民解放军北京军区总医院
Priority date: 2013-04-27
Filing date: 2013-05-22
Publication date: 2014-10-30
Also published as: CN103340642A; CN103340642B

Abstract

A movable CT scanner comprises a rotary disc (3) and a machine frame which are in rotating fit by using a bearing (4). The rotary disc (3) is fixedly connected to an outer ring (5) of the bearing (4), and the machine frame is fixedly connected to an inner ring (6) of the bearing (4). According to the movable CT scanner in the solution, the rotary disc (3) is fixedly connected to the outer ring (5) of the bearing (4), and the outer ring (5) is used as a rotating component, and accordingly, in a case in which the rigidity is met, compared with a CT scanner which is in a mode that the rotary disc (3) is fixedly connected to the inner ring (6) of the bearing (4), the weight of the movable CT scanner is reduced, the convenience of the carry and transfer is improved, connection of the rotary disc (3) is implemented by using the smaller bearing (4), and the cost is reduced.

Description

Mobile CT scanner

The present invention claims the priority of a Chinese patent application entitled "Mobile CT Scanner" filed on April 27, 2013, to China National Intellectual Property No. 201310152623.6.

Technical field

The present invention relates to the field of CT scanner technology, and in particular, to a mobile CT scanner.

Background technique

Computed Tomography (CT) was born in the 1970s and was subsequently applied clinically. With the development of CT imaging technology, the imaging time of CT scanners is getting shorter and shorter, and the amount of information provided by tomograms is getting larger and larger, so it has become more and more widely used in clinical diagnosis and treatment activities. The means of diagnosis and treatment play a very important role.

The conventional CT scanner, as shown in Fig. 1, has its turntable 1 and the frame rotated and coupled by the bearing 2, and the turntable 1 is fixedly connected with the inner ring of the bearing 2, and the frame is fixedly connected with the outer ring of the bearing, and the structure is adopted. In order to meet the requirements of rigidity and strength, the weight of the entire structure is large. For mobile CT scanners that appear to cope with major natural disasters, traffic accidents, and wartime CT needs, the above structure is obviously not conducive to reducing the weight of the entire mobile CT scanner system, making the mobile CT scanner It is not conducive to handling and transfer, and the bearing size is relatively high and costly.

Summary of the invention

A brief summary of the invention is set forth below to provide a basis for some aspects of the invention. It should be understood that this summary is not an exhaustive overview of the invention. It is not intended to identify key or critical aspects of the invention, and is not intended to limit the scope of the invention. Its purpose is to present some concepts in a simplified form as a pre-

The invention provides a mobile CT scanner for solving the problem that the weight of the existing mobile CT scanner system is large, which is not conducive to handling transfer and large bearing size and high cost.

The invention provides a mobile CT scanner, which comprises a rotary table and a machine which are rotated and matched by a bearing - a frame, the turntable is fixedly connected to the outer casing of the bearing, and the frame is fixedly connected to the inner bore of the bearing.

The mobile CT scanner provided by the invention fixes the movement by fixing the connection between the turntable and the outer casing of the bearing, and using the outer group as the rotating component, and the fixed connection of the turntable and the inner ring of the bearing is adopted in the way of satisfying the rigidity. The weight of the CT scanner system improves the convenience of handling and transfer, and the connection to the turntable is completed with a smaller bearing, which reduces the cost.

These and other advantages of the present invention will become more apparent from the detailed description of the preferred embodiments of the invention.

DRAWINGS

The invention may be better understood by reference to the following description given in conjunction with the accompanying drawings, which are incorporated in the specification and The preferred embodiments of the invention are further illustrated and the principles and advantages of the invention are disclosed. In the drawing:

1 is a schematic structural view of a conventional CT scanner turntable and a rack connection;

2 is a schematic structural diagram of a connection between a rotating CT scanner turntable and a rack according to an embodiment of the present invention;

3 is a partial cross-sectional view showing a connection between a turntable and a rack of a mobile CT scanner according to an embodiment of the present invention;

4 is a perspective view of a rotary CT scanner turntable according to an embodiment of the present invention;

5 is a front view of a mounting portion of a mobile CT scanner according to an embodiment of the present invention; and FIG. 6 is a top view of a base portion of a mobile CT scanner according to an embodiment of the present invention.

It will be understood by those skilled in the art that the <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; For example, the dimensions of some of the elements in the figures may be exaggerated relative to the other elements in order to improve the understanding of the embodiments of the invention.

detailed description

Exemplary embodiments of the present invention will be described in detail below with reference to the drawings. For the sake of clarity and conciseness, not all features of an actual implementation are described in the specification. However, It is understood that many implementation-specific decisions must be made in the development of such an actual embodiment in order to achieve the developer's specific objectives, for example, compliance with system and business related constraints, and these limitations may be It will change depending on the implementation. In addition, it should also be appreciated that while development work can be very complex and time consuming, such development work is merely a routine task for those skilled in the art having the benefit of the disclosure.

It should also be noted that, in order to avoid obscuring the present invention by unnecessary detail, only the device structure and/or processing steps closely related to the solution according to the present invention are described in the drawings and the description. The representations and descriptions of components and processes known to those of ordinary skill in the art that are not relevant to the present invention are omitted.

2 is a schematic structural view of a connection between a rotary CT scanner and a chassis according to an embodiment of the present invention; and FIG. 3 is a partial cross-sectional view showing a connection between a rotary CT scanner and a chassis according to an embodiment of the present invention. As shown in FIG. 2 and FIG. 3, the mobile CT scanner provided by the embodiment of the present invention comprises a turntable 3 and a frame which are rotated and fitted by a bearing 4, and the turntable 3 is fixedly connected with the outer ring 5 of the bearing 4, the frame and the bearing 4 The inner jaw 6 is fixedly connected.

The mobile CT scanner provided by the invention fixedly connects the turntable 3 with the outer group 5 of the bearing 4, and uses the outer cymbal 5 as a rotating component. Under the condition that the rigidity is satisfied, the turntable 3 and the inner ring 6 of the bearing 4 are fixedly connected. The method reduces the weight of the mobile CT scanner system, improves the convenience of handling transfer, and realizes the connection of the turntable 3 by using the smaller bearing 4, thereby reducing the cost.

In actual use, components such as an X-ray tube, a detector, a slip ring, and a power supply are fixedly connected to the turntable 3, and rotate with the rotation of the outer ring 5 of the bearing 4 to perform a CT scan operation.

In actual use, the diameter of the turntable can be 940, the inner diameter of the bearing is 434譲, the four-point contact ball bearing is used for the shaft, the radial dynamic load is 123kN, the axial dynamic load is 188kN, the radial runout is 80 μm, precision Ρ5, the noise is less than 50 decibels when it is 60r/min, i^J has a mute effect.

The turntable can be made of 嫫^r material, which greatly reduces the quality of the turntable without reducing the rigidity of the turntable. Moreover, when the magnesium alloy is impacted on the turntable, the absorbed energy is larger than that of the aluminum alloy, so that the seismic noise reduction performance can be improved. In addition, the use of magnesium alloy materials has lower cutting resistance than other metals, which facilitates processing and is advantageous for improving processing efficiency.

The turntable is mainly subjected to its own centrifugal force, the pulling force of the X-ray tube and the detector. In order to ensure the dynamic balance of the turntable when rotating, the X-ray tube and the detector disposed on the turntable are symmetrically distributed in mass. - - For the principle.

Further, based on the above embodiment, the mobile CT scanner further includes a base 23 which is slidably engaged with the base 23 in a horizontal direction, and the sliding direction of the frame is parallel to the rotational axis of the turntable 3.

Specifically, two mutually parallel guide rails 14 can be fixed to the base 23 by bolts, and a sliding fit of the frame and the base 23 in the horizontal direction is achieved by a sliding fit between the slider 15 and the guide rails 14. Since the frame and the base 23 can slide relative to each other, and the sliding direction of the frame is parallel to the rotation axis of the turntable 3, the moving CT scanner does not need to provide a dedicated scanning bed, which is advantageous for reducing the moving CT scanner. The overall volume increases the convenience of movement. By the cooperation of the guide rail 14 and the slider 15, the reliability of the sliding and the sliding accuracy can be improved, and the imaging quality of the mobile CT scanner can be improved.

When the mobile CT scanner is in use, the patient and the casualty can lie flat on any bed, and slide in a straight line with respect to the base 23 in the horizontal plane to perform a scanning motion.

For ease of movement, casters can be mounted below the base 23.

The frame may include a struts 9 of a splicing structure. The gussets are fixed at the top of the struts 9 by bolts. The horns 8 are fixedly connected to the inner cymbal 6 of the bearing 4 by bolts. The corner seat 8 can be machined from a cast aluminum alloy ZL205.

Further, based on the above embodiment, as shown in FIG. 4, a support base 11 is disposed under the base 23, and the support 11 and the base 23 are slidably engaged in a vertical direction, and the base 23 is fixedly coupled with the drive support base 11 opposite to the base. 23 sliding first linear drive 10.

Both the base 23 and the support base 11 can adopt a spliced frame structure.

The first linear actuator 10 can be an electric push rod, a hydraulic rainbow or a pneumatic cylinder. The first linear actuator 10 in this embodiment employs an electric push rod. The cylinder of the electric push rod is fixed on the base 23, and the telescopic rod is connected with the support base 11. For example, the end of the telescopic rod is placed on the top of the support base 11, and the base 23 is controlled by controlling the expansion and contraction of the telescopic rod of the electric push rod. The up and down movement causes the frame attached to the base 23 to drive the turntable 3 downwardly to accommodate the bed of different heights, thereby improving the applicability of the mobile CT scanner.

Further, based on the above embodiment, in order to improve the stability and reliability of the base 23 sliding up and down relative to the support base 11 in the vertical direction, a guide with an axis in the vertical direction is fixedly connected to one of the support base 11 and the base 23 The sleeve 12 is fixedly coupled to the guide rod 13 correspondingly to the guide sleeve 12. For example, but not limited to, welding the guide rod 13 on the support base 11, and splicing on the base 23 - - Guide sleeve 12, the guide rod 13 is slidably inserted into the guide sleeve 12. The guide sleeve 12 can be a circular tube, and the guide rod 13 can be a cylinder or a round tube.

Further, based on the above embodiment, the outer bobbin 5 is fixedly coupled with the driven wheel, the driven wheel is coaxially disposed with the outer ring 5, and the inner ring 6 is rotatably mounted with a driving wheel for driving the driven wheel to rotate. The rotation of the turntable 3 fixed to the outer cymbal 5 is driven by the wheel rotation mode, and the structure is simple and the operation is reliable.

Further, based on the above embodiment, in order to reduce the noise during operation of the mobile CT scanner, the driven wheel adopts the driven pulley 7, and the driving wheel employs the primary pulley 18. A drive belt is wound between the driven pulley 7 and the primary pulley 18. The drive belt can be a timing belt, and accordingly the driven pulley 7 and the primary pulley 18 are synchronous pulleys. For example, but not limited to, the timing belt can be equipped with a high-torque synchronous toothed belt MTS8M, which has a transmission capacity of about 2 times that of a high-torque synchronous toothed belt and a temperature of -30-90 Π, so that a high-load transmission can be realized. save space. A mounting seat is fixedly connected to the inner cymbal 6 by bolts. The mounting base includes a fixing member 20 fixedly connected to the inner ring 6. The fixing member 20 is detachably fixedly connected with the driving pulley mounting member 19, and the fixing member 20 is mounted with the driving pulley. A tensioning mechanism is provided between the pieces 19 that drives the drive pulley mount 19 away from the drive pulley 18. The tension between the driving pulley 18 and the driven pulley 7 is controlled by the tensioning mechanism, thereby adjusting the tension of the driving belt, so that the belt pulley constituted by the driven pulley 7, the driving pulley 18 and the driving belt is at The best conditions.

Referring to FIG. 5, the fixing member 20 can be a flat plate. The fixing member 20 is provided with a long hole. The driving pulley mounting member 19 passes through the bolt and the fixing member which are inserted into the long hole. 20 adjustable fixed connection. The length direction of the elongated hole is parallel to the center line of the driven pulley 7 and the driving pulley 18. The position of the primary pulley mounting member 19 can be adjusted along the length of the elongated hole by loosening the bolt, and the bolt is tightened to securely attach the primary pulley mounting member 19 to the fixing member 20 after the adjustment is completed.

The driving pulley motor 19 is connected to the driving pulley motor 19, and the driving motor 17 is drivingly connected to the driving pulley 18 to drive the driving pulley 18 to rotate.

The starting torque of the bearing used in the above embodiment may be Mz = 15 N. m. When the bearing is low in the starting stage, the rotational friction torque of the bearing is the same as the starting force. The moment of inertia of the turntable and its fixed components is J=13kg - the acceleration time of the f-multi-motion CT scanner turntable is T=4S, and the final turn of the turntable is 60rpm, ie ω = 2 π. The drive motor 17 is a geared motor with a speed ratio of 1:8, and the transmission ratio of the driven pulley 7 to the drive pulley 18 is 1:4.2. Then the angular acceleration of the turntable is: - - =ω/ Τ = - 2; The torque of the turntable is:

M = M _Z J+ d^Nm , then the torque of the drive motor 17 is: a = _z / 33.6 1.05 Nm. Therefore, the drive motor 17 can be selected from the servo motor of the type SGMJV- 08ADD6S, and its rated torque is 2·39N · m, the highest The torque is 8 · 36 N · m and the rated speed is 3000 rpm.

Further, based on the above embodiment, in order to facilitate adjustment to achieve tensioning of the driving belt, the tensioning mechanism may include a tensioning mounting member 21 fixedly coupled to the fixing member 20, and the tensioning mounting member 21 is screwed with the ejector rod 22 The jack 22 is in a tight fit with the drive pulley mount 19.

The tensioning mounting member 21 may be a rectangular parallelepiped block that can be fixedly attached to the fixing member 20 by screws.

Further, based on the above embodiment, in order to facilitate the sliding of the drive frame relative to the base 23 to achieve automatic control, a second linear drive for driving the frame to slide is disposed between the frame and the base 23.

Further, based on the above embodiment, as shown in FIG. 6, in order to improve the control precision, the second linear actuator includes a ball screw 24 and a servo motor 16 connected to the ball screw 24, and the nut of the 3⁄4^ is fixedly connected to the frame. The servo motor 16 is fixedly connected to the base 23. The linear movement of the frame relative to the base 23 can be controlled by the rotation of the ball screw 24.

Of course, the second linear drive can also be a cylinder or a ί1⁄2 cylinder.

In the actual use, the rated dynamic load of the guide rail 14 is 94 kN, the rated torque is 2. 68 kN · m, the friction coefficient is less than 0. 008, the horizontal maximum speed V = 100 let / s, the time to accelerate to the maximum speed is 0. 25s, The horizontal maximum load m = 160 kg, and the frictional resistance f = 88N.

The thrust of the frame slide on the drive rail is:

F=f+ (0. 1/0. 25) m=152 (N) ;

The output torque of the lead screw 24 is: - -

The moment of inertia of the bar 24 is:

32 transmission efficiency n =0. 9 , lead B=5譲, the diameter of the ball screw 24 D=15, the length of the ball screw 24 L=500mm, ^ is the density of the ball screw 24, brought in :

T _L =0. 14N · m;

J=2xlO" ⁵ Kgm ² .

3⁄4 ^screw 24 input torque is:

T _M = T _L JW IB) 2 . Then, Tm=0. 143N . m, the servo motor 16 can be selected as SGMPS-04-A. While the invention and its advantages are described in detail, it is understood that various modifications, alternatives and changes can be made without departing from the spirit and scope of the invention as defined by the appended claims.

Finally, it should also be noted that in this context, relational terms such as first and second are used merely to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply these entities. There is any such actual relationship or order between operations. Furthermore, the terms "comprising," "comprising," or "includes" or "include" or "the" Other elements, or elements that are inherent to such a process, method, item, or device. An element defined by the phrase "comprising a ..." does not exclude the same element in the process, method, item, or device that comprises the element, without further limitation.

The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. Various modifications and changes may be made to the above-described embodiments without departing from the spirit and scope of the invention. Therefore, the scope of the invention is to be limited only by the appended claims and their equivalents.

Claims

claims

1. A mobile CT scanner, including a turntable and a frame that are rotated through bearings, characterized in that the turntable is fixedly connected to the outer ring of the bearing, and the frame is fixedly connected to the inner ring of the bearing. .

2. The mobile CT scanner according to claim 1, further comprising a base, the frame and the base are slidingly matched in a horizontal direction, and the sliding direction of the frame is consistent with the rotation axis of the turntable. parallel.

3. The mobile CT scanner according to claim 2, characterized in that, a support seat is provided below the base, the support seat and the base slide in a vertical direction, and the base is fixedly connected with A first linear drive that drives the support seat to slide relative to the base.

4. The mobile CT scanner according to claim 3, characterized in that, one of the support base and the base is fixedly connected with a guide bush whose axis is in the vertical direction, and the other is fixedly connected with the The guide sleeve corresponds to the matching guide rod.

5. The mobile CT scanner according to any one of claims 1 to 4, characterized in that, a driven wheel is fixedly connected to the outer ring, and the driven wheel is coaxially arranged with the outer ring, and the inner ring A driving wheel that drives the driven wheel to rotate is mounted on the upper part.

6. The mobile CT scanner according to claim 5, characterized in that: the driven pulley is a driven pulley, the driving pulley is a driving pulley, and the driven pulley and the driving pulley are A drive belt is provided around the inner ring, and a mounting seat is fixedly connected to the inner ring. The mounting seat includes a fixing piece fixedly connected to the inner ring, and a driving pulley mounting piece is adjustable and fixedly connected to the fixing piece. A tension that can drive the driving pulley mounting piece away from the driven pulley is provided between the fixing piece and the driving pulley mounting piece.

7. The mobile CT scanner according to claim 6, characterized in that, the tensioning includes a tensioning installation part fixedly connected to the fixing part, and an ejector rod is screwed on the tensioning installation part, so The push rod is tightly matched with the driving pulley mounting piece.

8. The mobile CT scanner according to any one of claims 2 to 4, characterized in that the base is provided with guide rails, and the frame is fixedly connected with a slider that slides and cooperates with the guide rails.

9. The mobile CT scanner according to any one of claims 2 to 4, characterized in that a second linear actuator for driving the sliding movement of the frame is provided between the frame and the base.

10. The mobile CT scanner according to claim 9, wherein the second linear drive includes a roller and a servo motor drivingly connected to the roller, and the nut of the ball wire is connected to the roller. The L frame is fixedly connected, and the servo motor is fixedly connected to the base.