阅读说明：本技术 一种核磁共振成像仪筒体的制备方法 (Preparation method of nuclear magnetic resonance imager cylinder ) 是由 孙树凯 梁子青 邢月 丁晓春 张占东 王洋 李小波 谭纪文 于 2019-10-25 设计创作，主要内容包括：本发明是一种核磁共振成像仪筒体的制备方法,该筒体的结构组件包括作为壳体的主体(1),主体(1)为筒状结构,主体(1)的外圆周上设置有加强环(2),在主体(1)的内表面上设置有导轨(3)用于放置病人躺卧的床板,其特征在于：所述主体(1)采用芳纶蜂窝夹芯三明治结构制成,除去导轨(3)的下方区域,该下方区域采用实心预浸料层(4),加强环(2)采用单向预浸料铺贴在主体(1)外侧,将主体(1)和加强环(2)共固化一体成型,导轨(3)采用玻璃纤维预浸料模压成型后再用环氧树脂与主体(1)粘接而成。该筒体采用芳纶蜂窝夹芯三明治结构,局部设计实心预浸料层,起到降低产品重量,提高生产效率及安全性的作用,且具有更加优良的隔热、隔音性能。(The invention relates to a preparation method of a nuclear magnetic resonance imager cylinder, which comprises a main body (1) as a shell, wherein the main body (1) is of a cylindrical structure, a reinforcing ring (2) is arranged on the outer circumference of the main body (1), and a guide rail (3) for placing a bed board for a patient to lie is arranged on the inner surface of the main body (1), and is characterized in that: the main body (1) is made of an aramid fiber honeycomb sandwich structure, the lower area of the guide rail (3) is removed, the lower area adopts a solid prepreg layer (4), the reinforcing ring (2) is paved and attached to the outer side of the main body (1) through one-way prepreg, the main body (1) and the reinforcing ring (2) are co-cured and integrally formed, and the guide rail (3) is formed by bonding the main body (1) with epoxy resin after being molded through compression molding through glass fiber prepreg. This barrel adopts aramid fiber honeycomb to press from both sides core sandwich structure, and the solid prepreg layer of local design plays the effect that reduces product weight, improves production efficiency and security, and has more excellent thermal-insulated, sound insulation performance.)

1. A preparation method of a nuclear magnetic resonance imager cylinder comprises a main body (1) serving as a shell, wherein the main body (1) is of a cylindrical structure, a reinforcing ring (2) is arranged on the outer circumference of the main body (1), and a guide rail (3) for placing a bed board for a patient to lie is arranged on the inner surface of the main body (1), and is characterized in that: the main body (1) is made of an aramid fiber honeycomb sandwich structure, the lower area of the guide rail (3) is removed, the lower area adopts a solid prepreg layer (4), the reinforcing ring (2) is paved and attached to the outer side of the main body (1) through one-way prepreg, the main body (1) and the reinforcing ring (2) are co-cured and integrally formed, and the guide rail (3) is formed by bonding the main body (1) with epoxy resin after being molded through compression molding through glass fiber prepreg.

2. The method for preparing a barrel of a nuclear magnetic resonance imager according to claim 1, characterized in that: the inner skin and the outer skin of the aramid fiber honeycomb sandwich structure are made of glass fiber prepreg, carbon fiber prepreg or aramid fiber prepreg.

3. The method for preparing a barrel of a nuclear magnetic resonance imager according to claim 1, characterized in that: the sandwich material of the aramid fiber honeycomb sandwich structure is 24-72 KG/m³The aramid paper honeycomb or the aluminum honeycomb.

4. The method for preparing a barrel of a nuclear magnetic resonance imager according to claim 1, characterized in that: the thickness of the sandwich layer of the aramid fiber honeycomb sandwich structure of the main body (1) part with the longer arc length between the two solid prepreg layers (4) is 5-20 mm, the thickness of the outer skin is 0.5-2 mm, and the thickness of the inner skin is 0.5-2 mm.

5. The method for preparing a barrel of a nuclear magnetic resonance imager according to claim 1, characterized in that: the thickness of the sandwich layer of the aramid fiber honeycomb sandwich structure of the main body (1) part with shorter arc length between the two solid prepreg layers (4) is 3-5 mm, the thickness of the outer skin is 2-5 mm, and the thickness of the inner skin is 2-5 mm.

6. The method for preparing a barrel of a nuclear magnetic resonance imager according to claim 1, characterized in that: the unidirectional prepreg for preparing the reinforcing ring (2) is made of glass fiber prepreg, carbon fiber prepreg or aramid fiber prepreg.

7. The method for manufacturing a barrel of a magnetic resonance imager according to claim 1 or 6, characterized in that: the reinforcing ring (2) is formed by paving and pasting a unidirectional prepreg into two layers of step shapes with the thicknesses of 5-7 mm and 8-12 mm.

8. The method for preparing a barrel of a nuclear magnetic resonance imager according to claim 1, characterized in that: the projection of the guide rail (3) on the main body (1) along the normal direction of the outer circumference of the main body (1), namely the lower area, is positioned in the area range of the solid prepreg layer (4).

9. The method for preparing a barrel of a nuclear magnetic resonance imager according to claim 1, characterized in that: the thickness of a single layer of the prepreg adopted in the method is 0.1-1 mm.

10. The method of manufacturing a magnetic resonance imager cylinder according to claim 9, characterized in that: the prepreg used in the method has a monolayer thickness of 0.28 mm.

Technical Field

The invention discloses a preparation method of a nuclear magnetic resonance imager cylinder, and belongs to the technical field of composite material forming.

Background

Magnetic Resonance Imaging (MRI) is a medical imaging apparatus which obtains electromagnetic signals from a human body by using the phenomenon of magnetic resonance and reconstructs human body information by using the electromagnetic signals, and is different from other medical apparatuses such as PET and SPECT in that magnetic resonance imaging is used instead of injecting radioactive isotopes, and because magnetic resonance has the capability of directly slicing in any direction, the MRI apparatus can be almost used for imaging diagnosis of all systems of the whole body, and is now an indispensable medical apparatus of all large medical institutions.

The barrel of the nuclear magnetic resonance imager is generally formed by glass fiber reinforced plastic by processes such as hand pasting, winding or vacuum infusion, and the like, and the formed product has heavier quality and unsatisfactory heat insulation and sound insulation performance.

The aramid honeycomb laminated plate structure is applied to parts such as inner trims and wing plates of airplanes for the first time, and recently, along with the localization of aramid honeycombs and prepregs, the cost is reduced continuously, and the aramid honeycomb sandwich structure is also applied to civil products such as civil aircrafts, yachts, rail transit and the like in a large amount.

The barrel of the nuclear magnetic resonance imager is made of the aramid fiber honeycomb sandwich structure, and due to the excellent specific strength and specific rigidity performance, the weight of the barrel can be reduced by about 40%, and the barrel has better heat insulation and sound insulation effects.

Disclosure of Invention

The invention aims to provide a preparation method of a nuclear magnetic resonance imager cylinder, the cylinder adopts an aramid fiber honeycomb sandwich structure, a solid prepreg layer is locally designed, the effects of reducing the weight of a product and improving the production efficiency and safety are achieved, and the cylinder has more excellent heat insulation and sound insulation properties.

In order to achieve the purpose, the invention provides the following technical scheme:

in the preparation method of the nuclear magnetic resonance imager cylinder, the structural component of the cylinder comprises a main body 1 as a shell, the main body 1 is of a cylindrical structure, a reinforcing ring 2 is arranged on the outer circumference of the main body 1, and a guide rail 3 for placing a bed board for a patient to lie is arranged on the inner surface of the main body 1, and the preparation method is characterized in that: the main part 1 is made of an aramid fiber honeycomb sandwich structure, the lower area of the guide rail 3 is removed, the lower area adopts a solid prepreg layer 4, the reinforcing ring 2 is paved and attached to the outer side of the main part 1 through unidirectional prepreg, the main part 1 and the reinforcing ring 2 are co-cured and integrally formed, and the guide rail 3 is formed by bonding epoxy resin with the main part 1 after being molded through compression molding through glass fiber prepreg.

In one implementation, the inner skin and the outer skin of the aramid fiber honeycomb sandwich structure are made of glass fiber prepreg, carbon fiber prepreg or aramid fiber prepreg.

In one implementation, the sandwich material of the aramid fiber honeycomb sandwich structure is 24-72 KG/m³The aramid paper honeycomb or the aluminum honeycomb.

In one implementation, the thickness of the sandwich layer of the aramid fiber honeycomb sandwich structure of the main body 1 part with the longer arc length between the two solid prepreg layers 4 is 5-20 mm, the thickness of the outer skin is 1-2 mm, and the thickness of the inner skin is 1-2 mm.

In one implementation, the thickness of the sandwich layer of the aramid fiber honeycomb sandwich structure of the main body 1 part with the shorter arc length between the two solid prepreg layers 4 is 3-5 mm, the thickness of the outer skin is 3-4 mm, and the thickness of the inner skin is 3-4 mm.

In one implementation, the unidirectional prepreg from which the reinforcement ring 2 is made is a glass fiber prepreg, a carbon fiber prepreg or an aramid fiber prepreg.

In one implementation, the reinforcing ring 2 is formed by paving and pasting a unidirectional prepreg into a two-layer step shape with the thickness of 5-7 mm and 8-12 mm.

In one embodiment, the projection of the guide rail 3 onto the body 1 in the direction of the normal to the outer circumference of the body 1, i.e. the lower region, is located within the region of the solid prepreg layer 4.

In one embodiment, the prepreg used in the method has a single layer thickness of 0.1 to 1 mm. Further, the prepreg used in the method has a single layer thickness of 0.28 mm.

The preparation method of the nuclear magnetic resonance imager cylinder comprises the following steps:

step S01: designing a metal mold and coating a release agent on the mold according to requirements;

step S02: sequentially laying an inner skin and carrying out vacuum compaction;

step S03: laying a solid prepreg layer 4 and a honeycomb, carrying out vacuum compaction, breaking the honeycomb along the circumferential direction of the cylinder, filling adhesive films at the broken part,

step S04: laying prepreg with the same thickness as the honeycomb on the edge of the honeycomb for edge sealing;

step S05: laying an outer skin and carrying out vacuum compaction;

step S06: after the limiting silica gel plate is arranged on the outer skin, the reinforcing ring (2) is laid along the limiting silica gel plate.

Step S07: sealing and vacuum-feeding into a drying oven for medium-temperature curing;

step S08: the molding adopts vacuum bag pressing and medium-temperature curing molding,

step S09: trimming and trimming after curing;

step S10: and positioning the guide rail by using a tool, and then bonding the guide rail by using epoxy structural adhesive.

The technical scheme of the invention has the following characteristics and beneficial effects:

1. the nuclear magnetic resonance scanner is generally installed in a hospital examination room, a large number of patients are in the examination room, the space is small, large-scale machines such as a forklift are not easy to get in and out, the original weight of a cylinder body of the nuclear magnetic resonance scanner is about 60-80KG, and the nuclear magnetic resonance scanner is easy to be injured by being manually moved and lifted. After the product adopts aramid fiber honeycomb sandwich structure, greatly reduced the quality of product, only original about 60%, made things convenient for workman's operation greatly, improved the security.

2. The solid prepreg layer is locally adopted, the prepreg layer is made of high-strength and high-modulus prepreg, so that a girder of the product is formed, the girder bears main pressure, and the rest positions can be made of materials with lower cost, so that the product cost can be effectively reduced.

3. In the invention, the honeycomb is disconnected along the circumferential direction of the cylinder body, and the disconnected part is filled with an adhesive film. The manufactured product honeycomb can be better attached to the prepreg, and the interlaminar performance is good.

4. In the invention, the glass fiber prepreg is used for being paved into honeycombs with the same thickness for edge sealing, thereby not only increasing the product strength, but also preventing impurities such as water, oil and the like from polluting the honeycombs.

5. In the invention, the limiting silica gel plate is laid before the reinforcing ring is laid, and the limiting silica gel plate and the product are cured together. The width and the step height of the reinforcement ring 2 can be effectively controlled.

Drawings

FIG. 1 is a front view of a NMR cylinder according to the invention;

FIG. 2 is a top view of a NMR cylinder according to the invention;

FIG. 3 is a cross-sectional view of a nuclear magnetic resonance cylinder A-A according to the present invention;

FIG. 4 is a partial enlarged view of a portion B of the NMR cylinder of the invention;

FIG. 5 is a cross-sectional view of a C-C NMR cylinder according to the invention;

Detailed Description

The technical scheme of the invention is further detailed in the following by combining the drawings and the embodiment:

the preparation method of the nuclear magnetic resonance imager cylinder comprises the following steps:

step S01: designing a metal mold and coating a release agent on the mold according to requirements;

step S02: laying an inner skin and carrying out vacuum compaction. The inner skin is made of 300g of glass fiber woven prepreg, the thickness of a single-layer prepreg is 0.28mm, the thickness of the inner skin of the main body 1 part with the longer arc length between two solid prepreg layers 4 is 1.12mm, and the thickness of the inner skin of the main body 1 part with the shorter arc length between two solid prepreg layers 4 is 3.08 mm;

step S03: laying a solid prepreg layer 4, wherein a solid prepreg cloth layer is made of high-modulus unidirectional glass fiber prepreg, the thickness of a single layer is 0.32mm, the thickness of a unidirectional glass fiber prepreg laying layer is 3.8mm, and the solid prepreg layer 4 is laid on inner skins of the main body 1 parts at the two ends of the short arc length;

step S04: laying prepreg cloth layers with the same thickness as the honeycomb on the edge of the honeycomb for edge sealing;

step S05: laying honeycomb and vacuum compacting, wherein 48KG/m is selected as honeycomb³The aramid fiber paper honeycomb is broken along the circumferential direction of the cylinder, glue films are filled in the broken parts, the thickness of the honeycomb of the main body 1 part with the longer arc length between the two solid prepreg layers 4 is 7.8mm, and the thickness of the honeycomb of the main body 1 part with the shorter arc length between the two solid prepreg layers 4 is 3.8 mm;

step S06: laying an outer skin and carrying out vacuum compaction; the outer skin is made of 300g of glass fiber woven prepreg, the thickness of a single-layer prepreg is 0.28mm, the thickness of the outer skin of the main body 1 part with the longer arc length between two solid prepreg layers 4 is 1.12mm, the thickness of the outer skin of the main body 1 part with the shorter arc length between two solid prepreg layers 4 is 3.08mm, and the outer skin with the thickness of 3.08mm is also paved on the solid prepreg layers 4;

step S06: after the limiting silica gel plate is installed on the outer skin, the reinforcing ring (2) is laid along the limiting silica gel plate, and the reinforcing ring (2) is divided into steps with the height of 5mm and the height of 10 mm.

Step S07: sealing and vacuum-feeding into a drying oven for medium-temperature curing;

step S08: the molding is carried out by vacuum bag pressing and medium-temperature curing molding, the curing temperature is 90 ℃ for 1 hour, and then the temperature is increased to 135 ℃ for 2 hours;

step S09: trimming and trimming after curing;

step S10: and positioning the guide rail by using a tool, and then bonding the guide rail by using epoxy structural adhesive.

The above detailed description explains the construction, features and effects of the present invention in detail, and is only a preferred embodiment of the present invention, but the present invention is not limited to the scope of the illustrated embodiment, and it is within the scope of the present invention to cover the equivalent embodiments modified or modified by the equivalent changes according to the idea of the present invention without departing from the spirit covered by the description.