JP5201857B2 - Top plate for X-ray diagnostic equipment - Google Patents

Description

  The present invention relates to a top plate for an X-ray diagnostic apparatus, and more specifically, in a top plate for an X-ray diagnostic apparatus having a cylindrical member and a fitting member that is adhesively bonded to the inside of the cylindrical member. The present invention relates to a top plate structure that is less likely to cause peeling noise due to adhesion.

  When a human body is seen through with an X-ray diagnostic apparatus, the human body of the subject is placed on the top board and imaged. In this way, the top plate on which the human body is placed needs to be manufactured from a material having sufficient strength and rigidity to support the body weight and excellent in X-ray permeability in order to make a captured image clear. From such a viewpoint, as a material used for the top plate for an X-ray diagnostic apparatus, a carbon fiber reinforced resin excellent in strength and elastic modulus and excellent in X-ray permeability is widely used as compared with a general material. Yes. Carbon fiber reinforced resins are usually composed of carbon fibers and thermosetting resins (see Patent Documents 1 and 2).

  This conventional X-ray diagnostic apparatus top plate made of carbon fiber reinforced resin has a thick metal member to be supported by other external members at the end of the X-ray non-transparent portion of the core material processed into a top plate shape. A sandwich configuration in which a carbon fiber woven fabric impregnated with an uncured thermosetting resin is attached to the surface of the insert, and the face plate is formed by heat curing is the mainstream.

  However, due to the large difference in rigidity between the face plate attached to the core material surface and the metal member, when a large load is applied to the top plate, peeling occurs due to stress concentration at the bonded end interface between the metal member and the face plate. There is a problem that abnormal noise is generated due to peeling, and the top plate quality is remarkably impaired and the strength and durability are poor.

  Further, in the techniques disclosed in Patent Document 1 and Patent Document 2, since a core material is used, it impedes X-ray transmission, and sufficient X-ray transmission performance as a top plate cannot always be obtained, and is clear. In addition, there is a problem that a high-quality image cannot be obtained, and the material cost of the core material itself is high, and the processing to the top plate shape is necessary. The carbon fiber woven fabric impregnated with the conductive resin needs to be attached manually, and there is a problem that productivity is low.

  To solve this problem, insert a core into the space of the outer mold in which the space penetrates in a straight line, and use a mold that forms a molding space surrounded by the core and the outer mold. X-ray diagnostics that can be manufactured without using a core material by inserting a base material impregnated with a thermosetting resin into the mold molding space and pulling out the base material while heating the mold. In order to realize a cantilever state on one side in the length direction using a method for forming a cylindrical member for a device (Patent Document 3) and a hollow top plate made of carbon fiber reinforced resin, the cylindrical shape is used. The thing which fitted the metal member made from aluminum as a reinforcement member to the non-perspective part of the member is disclosed (patent document 4).

However, in the case of a top plate for an X-ray diagnostic apparatus in which the core material is not inserted, the X-ray transmission is improved as compared with the top plate in which the core material is inserted, but the top and bottom of the cylindrical members constituting the top plate are two. Since the face plates are connected at both ends in the width direction and are not connected via the core material, when a large bending load is applied to the top plate, the cylindrical shape is not connected via the core material. The member is deformed larger than the cylindrical member of the top plate joined through the core material, and even if the cylindrical member and the metal member are bonded with an adhesive, peeling easily occurs. Since the sound is generated, the quality of the top board is greatly impaired. In addition, there has been a problem that the peeling has progressed under long-term use, and the adhesion between the cylindrical member and the metal member has been completely peeled off, and improvement has been demanded from the viewpoint of strength reliability.
Japanese Utility Model Publication No. 5-62208 Japanese Utility Model Publication No. 6-12035 JP 2003-319936 A JP 2007-020986 A

  In view of the above-described points, an object of the present invention is from a cylindrical member formed of carbon fiber reinforced resin and a metal or fiber reinforced resin reinforcing member fitted inside one end of the cylindrical member. In the X-ray diagnostic apparatus top plate, even when a large load is applied, there is little occurrence of peeling at the joint between the cylindrical member and the reinforcing member, and the X-ray diagnostic apparatus has excellent long-term strength reliability. To provide a top board.

In order to achieve the above-described object, the top plate for an X-ray diagnostic apparatus according to the present invention has two long face plates formed of carbon fiber reinforced resin facing each other at intervals, and each of the width direction of the face plates is arranged. X-ray diagnostic apparatus ceiling comprising a cylindrical member formed by connecting both ends to each other, and a reinforcing member fitted inside the longitudinal end of the cylindrical member and formed of metal or fiber reinforced resin. It is a board, and the cylindrical member and the reinforcing member fitted to the cylindrical member are bonded using two types of adhesives, and among the parts bonded using the two types of adhesives A cylindrical member, and a distal end portion of the reinforcing member positioned at a portion closer to the center in the longitudinal direction of the cylindrical member than the one end portion with respect to the longitudinal end portion of the cylindrical member fitted with the reinforcing member The tip of the reinforcing member bonded with an elastic adhesive and bonded with the elastic adhesive 5-30% of the length in the longitudinal direction of the tubular member, the reinforcing member in the longitudinal direction of the cylindrical member of the fitting length of the tubular member and the reinforcing member is a length that has entered the tubular member It consists of what is characterized by existing in the range.

  According to the present invention, since it is composed of a cylindrical member formed of carbon fiber reinforced resin and a reinforcing member fitted to one end thereof, the core material is not used at the site where the subject is placed. The X-ray transmission sufficient for the top plate can be obtained, and a clear image can be obtained. Since the cylindrical member and the tip of the reinforcing member are bonded with an elastic adhesive, Even when a large bending load is applied, the elastic adhesive layer absorbs the tensile force in the direction perpendicular to the bonding surface and the deformation due to the shear stress at the bonding surface between the cylindrical member and the tip of the reinforcing member, and the tube It is possible to suppress the separation between the shaped member and the reinforcing member, and it is possible to suppress the generation of abnormal noise due to the separation. As a result, it is difficult to peel between the tubular member and the reinforcing member, and there is little noise generated due to peeling, and a top plate for an X-ray diagnostic apparatus that does not have a problem in strength durability caused by the adhesive is realized. can do.

Below, the top plate for X-ray diagnostic apparatuses which concerns on this invention is demonstrated in detail with desirable embodiment.
The top plate for an X-ray diagnostic apparatus according to the present invention is formed by arranging two long plates formed of carbon fiber reinforced resin facing each other at an interval, and connecting both ends in the width direction to each other. A cylindrical member and a reinforcing member that is fitted inside one end of the cylindrical member and formed of a metal or a fiber reinforced resin member. Is bonded to the tubular member by an elastic adhesive.

  Each of the two long face plates may be a flat plate shape, a curved shape having a two-dimensional curvature, or a combination thereof, but for the purpose of supporting a human body, it is a curved shape. Preferably there is. Moreover, carbon fiber reinforced resin normally consists of carbon fiber and resin, and thermosetting resin is suitable as resin. As the thermosetting resin, in the conventional top plate, in order to ensure the strength and rigidity required for the top plate, an epoxy resin that is said to be excellent in adhesion to carbon fiber is often used, From the viewpoint of imparting flame retardancy, ease of molding, productivity, and the like, unsaturated polyester resins and vinyl ester resins can also be used. In addition, it is good for the weight content rate of the carbon fiber in carbon fiber reinforced resin to exist in the range of 40 to 80%.

  The two long face plates are connected to each other at both ends in the width direction. However, the material used for the connection is X-ray transparent like the material used for the long face plate. It is preferable that the carbon fiber reinforced resin is excellent and has high strength.

  The maximum total thickness of the cylindrical member is preferably in the range of 20 to 80 mm. When the maximum total thickness is less than 20 mm, the rigidity as the top plate is insufficient, and the deflection tends to increase when a large load is applied. It is a material that increases the thickness of the face plate to increase the rigidity. The cost increases, which is disadvantageous in terms of cost. On the other hand, when the maximum total thickness is larger than 80 mm, the space between the subject and the X-ray irradiation head is narrowed, and the shape of the subject that can be imaged is likely to be limited.

  The reinforcing member is made of metal or fiber reinforced resin. When imaging is performed with the subject placed on the top plate, the top plate is cantilevered on one side in the length direction, and a large bending moment is applied to the joint between the X-ray imaging apparatus and the top plate. The X-ray apparatus and the top board are supported and joined by a resin support roller and a bolt, but since a large bending moment acts locally on the tubular member from the bolt, it cannot be supported by a hollow tubular member. The reinforcing member is fitted inside one end of the cylindrical member. In addition, the legal specifications regarding the length of the top plate and the loading load are becoming strict, and the top plate strength of the cantilevered end of the cylindrical member tends to be insufficient. A reinforcing member having a necessary length is fitted into the cylindrical member. As a material to be used, lightweight, high compressive strength aluminum, or fiber reinforced resin using glass fiber or carbon fiber as a reinforcing material is preferable.

The reinforcing member is fitted into one end portion of the cylindrical member and bonded using two types of adhesives. Among these, the cylindrical member and the tip of the reinforcing member located on the back side thereof are particularly provided. The adhesion part with a part is adhere | attached with an elastic adhesive agent. Elastic adhesives, the peel strength is high and rich in elasticity, and a large adhesive elongation, typically, tensile modulus 20~200kgf / cm ^2, preferably 20~150kgf / cm ^2, more preferably 20 It is in the range of 100 kgf / cm ² , and the breaking elongation is in the range of 50 to 350%, preferably 100 to 300%, more preferably 100 to 250%. Specifically, there are silicone-based, modified silicone-based, polysulfide-based, polyurethane-based, epoxy-based, modified polymer-based, elastomer-based and matrix mixed systems thereof, but a modified silicone-based elastic adhesive is often used. However, the modified silicone-only elastic adhesive has low strength, so it is not suitable when large strength is required. Therefore, an epoxy resin that has high hardness and high strength and is compatible with the modified silicone is used in combination with the modified silicone. Thus, it is preferable to use an adhesive having improved durability and adhesiveness as well as strength. Moreover, in order to avoid the thermal stress resulting from the difference between the thermal expansion coefficients of the two adherends, the adhesive is preferably a room temperature curing type.

  Even when a large bending load is applied to the top plate by bonding the cylindrical member and the tip of the reinforcing member with the elastic adhesive, the adhesive surface between the cylindrical member and the tip of the reinforcing member The elastic adhesive layer absorbs the tensile force in the direction perpendicular to the bonding surface and deformation due to shear stress, and can suppress the separation between the tubular member and the reinforcing member. Occurrence can be suppressed.

The reinforcing member is partially fitted to the tubular member in the length direction of the tubular member, and the length of the fitted portion, the so-called fitting length, can be adjusted as appropriate. Elastic adhesives, as described above, is used in the fitting portion of the tip portion of the reinforcing member, the fitting portion other than the tip portion is different from the elastic adhesive, general adhesives such as high strength adhesive Used. A general adhesive usually has a tensile elastic modulus of 5000 to 35000 kgf / cm ² , preferably 7500 to 25000 kgf / cm ² , more preferably 10,000 to 15000 kgf / cm ² , and a breaking elongation of 1 to 50%, preferably It is 2 to 30%, more preferably 2 to 20%. As general adhesives, epoxy, unsaturated polyester, phenol, urea, melamine, acrylic, silicone adhesives, etc., which are synthetic resin thermosetting adhesives with high tensile shear strength, or against impact, bending, peeling A type of adhesive that combines resistance with a thermosetting resin and a thermoplastic resin or synthetic rubber can be used.

In this invention, the length of the front-end | tip part of the reinforcement member adhere | attached with the elastic adhesive agent exists in the range of 5-30% of the said fitting length. Even when a large load is applied to the top plate, the tip length of the reinforcing member bonded with the elastic adhesive is 5 to 30% of the fitting length. The generated deformation can be absorbed within the adhesive range of the elastic adhesive, and the top plate of the X-ray diagnostic apparatus is further suppressed from peeling. If the length of the tip of the reinforcing member bonded with the elastic adhesive is too short, when a large load is applied to the top plate, the elastic adhesive is bonded to the tubular member and the reinforcing member within the bonding range of the elastic adhesive. However, peeling occurs between the tubular member and other than the tip of the reinforcing member because a general adhesive is used outside the adhesive range of the elastic adhesive. It becomes easy, and it becomes easy to generate peeling noise simultaneously with peeling. On the other hand, if the length of the distal end portion of the reinforcing member bonded with the elastic adhesive is too long, the shear rigidity of the fitting portion between the tubular member and the reinforcing member is lowered, and the rigidity as the top plate is easily lowered. Or, since a general adhesive is used in addition to the adhesive range of the elastic adhesive, the bonding ratio of the general adhesive decreases, so the bonding strength between the cylindrical member and the reinforcing member may decrease, and may not be used as a top plate. is there.

In the present invention, the elastic adhesive may be carried on a glass fiber fabric, and the glass fiber fabric carrying the elastic adhesive is disposed between the tubular member and the reinforcing member. As the glass fiber fabric, one having a weight per unit area in the range of 50 to 300 g / m ² is preferably used. Even when a general adhesive is used, it is preferable that the adhesive is supported on a glass fiber fabric.

  By using a glass fiber fabric carrying an elastic adhesive or a general adhesive, it is possible to carry an amount of adhesive necessary for adhesion during pressure bonding, and the thickness of the adhesive, so-called adhesive layer Can be made uniform, and sufficient adhesive strength can be expressed. Further, by obtaining a uniform adhesive layer thickness, it is possible to provide a top plate for an X-ray diagnostic apparatus that does not have thickness accuracy, warpage, distortion, or the like.

If the weight per unit area of the glass fiber fabric is less than 50 g / m ² , the thickness of the adhesive layer is less than 0.1 mm, and it may not be possible to absorb the difference in shape accuracy between the tubular member and the reinforcing member. , Voids are likely to be formed, and the bonding strength tends to decrease. On the other hand, if the weight per unit area of the glass fiber fabric exceeds 300 g / m ² , the adhesive layer thickness may exceed 0.5 mm, and when the top plate is heavily loaded, the adhesive layer Since the elastic modulus in the thickness direction is small, the deflection of the top plate tends to increase.

[Example 1]
Hereinafter, based on an Example, the top plate for X-ray diagnostic apparatuses of this invention is demonstrated. Note that the tensile modulus and breaking elongation of the adhesive were evaluated according to JIS K7162.

  1 and 2 show a schematic configuration of a top plate for an X-ray diagnostic apparatus according to one embodiment of the present invention, FIG. 1 is a perspective view of the top plate, and FIG. 2 shows a configuration of the top plate of FIG. It is sectional drawing of the junction part of the carbon fiber reinforced resin cylindrical member and aluminum reinforcement member to perform.

  A top plate 1 in FIG. 1 has two long carbon fiber reinforced resin face plates 2a and 2b made of a carbon fiber fabric and a thermosetting resin, facing each other at intervals, and both ends in the width direction are connected to each other. The carbon fiber reinforced resin cylindrical member 2 and an aluminum reinforcing member 3 bonded and bonded to the inside of one end thereof, and the cylindrical member 2 and the reinforcing member 3 are as shown in FIG. The glass fiber fabric 4 is adhesively bonded as an adhesive support material.

  The cylindrical member 2 is uncured to a carbon fiber woven fabric in a mold in which a core is inserted into an outer mold space in which the space penetrates linearly and a molding space surrounded by the core and the outer mold is formed. The carbon fiber base material impregnated with the thermosetting resin was inserted into the mold forming space, and was molded by applying tension to the base material while heating the mold to a length of 2.5 m. After cutting, both ends were machined into a rounded R shape. The carbon fiber weight content is 60%.

150 g / per unit area on the front and back of an aluminum member 3 (reinforcing member) having a length of 600 mm shown in FIG. A glass fiber woven fabric 4 made of glass roving cloth with a weight of m ² is applied, and a tensile modulus of room temperature curing type is 35 kgf / cm within a range of 75 mm from the tip on the back side when joining with the tubular member 2. ² 、 Apply and impregnate elastic adhesive 6 (EP-001, made by Cemedine Co., Ltd., mixed type with 50/50 weight ratio of epoxy resin and modified silicone) with a spatula on glass fiber fabric 4 with a breaking elongation of 200% The remaining adhesive part was coated and impregnated in the same manner with an industrial epoxy adhesive 5 (manufactured by Konishi Co., Ltd., E set L) having a tensile elastic modulus of 12000 kgf / cm ² and a breaking elongation of 15%. Adhesive bonding with the cylindrical member 2 and the top plate 1 It was produced.

  As shown in FIG. 4, one end of the top plate 1 is fixed on a metal base 8 with a metal block 9 and a set bolt 10 and the vicinity of the fixed portion is supported by a support roller 7 (cantilevered). When the loading test was conducted under the condition (2), no abnormal noise was generated due to peeling of the bonded portion between the tubular member 2 and the aluminum reinforcing member 3 until it was broken at 1300 kg, and the strength as a general top plate was improved. I was satisfied enough.

[ Reference Example 1 ]
The top plate formed and assembled in the same manner as in Example 1 except that the elastic adhesive was applied in the range from the tip on the back side when joining to the cylindrical member 2 to 325 mm was used as Example 1. When a loading test was carried out in the same manner, no abnormal noise was generated due to peeling of the bonded portion between the tubular member 2 and the aluminum reinforcing member 3 until breaking at 1050 kg, but the top plate when loaded with 300 kg The deflection at the tip was 25 mm, and the rigidity was reduced by about 30% with respect to the deflection of 19 mm in Example 1.

[Comparative Example 1]
When a loading test was carried out in the same manner as the top plate formed and assembled in the same manner as in Example 1 except that the same industrial epoxy adhesive as in Example 1 was used over the entire bonding range, 300 kg When the load was applied, a large peeling sound was generated. Subsequently, the loading test was continued, and thereafter, a peeling sound was generated successively until breaking at 1200 kg.

It is a schematic perspective view of the top plate for X-ray diagnostic apparatuses which concerns on one Example of this invention. It is sectional drawing of a junction part with the reinforcement member in the edge part of the top plate of FIG. It is a perspective view of the reinforcement member of FIG. It is a schematic block diagram which shows the loading test method of the top plate in an Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Top plate 2 Cylindrical member made of carbon fiber reinforced resin 3 Reinforcement member 4 Glass fiber fabric 5 Epoxy adhesive 6 Elastic adhesive 7 Support roller 8 Metal base 9 Metal block 10 Set bolt

Claims (4)

Two long face plates made of carbon fiber reinforced resin are arranged facing each other at intervals, and a cylindrical member formed by connecting both ends in the width direction to each other , and one end in the longitudinal direction of the cylindrical member A top plate for an X-ray diagnostic apparatus that is fitted inside the portion and formed of a reinforcing member made of metal or fiber reinforced resin, the tubular member and the reinforcing member fitted to the tubular member, Is bonded by using two types of adhesives, and one end in the longitudinal direction of the cylindrical member and the cylindrical member in which the reinforcing member is fitted, out of the parts bonded using the two types of adhesives The reinforcing member, which is bonded to the tip of the reinforcing member located at a portion closer to the center in the longitudinal direction of the cylindrical member than the one end with respect to the portion, is bonded with an elastic adhesive, and is bonded with the elastic adhesive longitudinal length in direction, longitudinal smell of the tubular member in the distal end portion of the tubular member X-ray diagnostic apparatus for the top plate of the reinforcing member is characterized in that the fitting length 5-30% of the range between the cylindrical member and the reinforcing member is a length that has entered the tubular member. The top plate for an X-ray diagnostic apparatus according to claim 1, wherein the elastic adhesive has a tensile elastic modulus in a range of ²⁰ to 200 kgf / cm ² and a fracture elongation in a range of 50 to 350%.   The top plate for an X-ray diagnostic apparatus according to claim 1 or 2, wherein the elastic adhesive is carried on a glass fiber fabric. Fiberglass fabric, weight per unit area is in the range of 50 to 300 g / m ^2, X-ray diagnostic apparatus for the top plate of claim 3.

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