CN113942247A - Forming device and method for preparing composite material cable anchor component by utilizing thermoplastic prepreg tape - Google Patents
Forming device and method for preparing composite material cable anchor component by utilizing thermoplastic prepreg tape Download PDFInfo
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- CN113942247A CN113942247A CN202111130457.0A CN202111130457A CN113942247A CN 113942247 A CN113942247 A CN 113942247A CN 202111130457 A CN202111130457 A CN 202111130457A CN 113942247 A CN113942247 A CN 113942247A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
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Abstract
The invention provides a forming device and a method for preparing a composite material cable anchor member by utilizing a thermoplastic prepreg tape, wherein the device comprises a bearing bottom plate, two transverse width-variable extrusion steel blocks, two longitudinal cylindrical section steel columns, two steel bars for adjusting the distance between the steel blocks, two semicircular steel sheets for lateral restraint and a plurality of wedges; six large bolt holes are formed in the bearing bottom plate, wherein the four large bolt holes in the middle are bolt holes for applying longitudinal displacement constraint, the two large bolt holes in the left side and the right side are bolt holes for fixing cylinders on the two sides, and arc surfaces are respectively machined at the joint of the front end surface and the end surfaces on the two sides of each transverse variable-width extruded steel block. The invention has simple structure and excellent forming effect, can form the thermoplastic resin composite material cable anchor components with different sizes by changing the winding turns and the width of the prepreg tape, has uniform and compact formed cable anchor components, stable size and excellent performance, and has important stress prospect in bridge inhaul cables and prestressed concrete structures.
Description
Technical Field
The invention belongs to the technical field of cable anchor member forming, and particularly relates to a forming device and a method for preparing a composite cable anchor member by using a thermoplastic prepreg tape.
Background
The corrosion problem of the steel stay cable is serious, the service time is short, and the cable replacement project is expensive; meanwhile, the steel cable is easy to fatigue, so that the service life of the steel cable is short, for example, in 1972, a Manheim Culter Mach bridge crosses the first parallel steel wire bundle cable-stayed bridge in the Rhein river world, and serious corrosion is generated after only 15 years. In contrast, fiber composites (FRP) have the advantages of light weight, high strength, high modulus, corrosion resistance, fatigue resistance, and the like. Although the FRP cable is higher in price than a steel cable, the long-term benefit of the FRP cable in a large-span bridge structure is better than that of the steel cable due to the characteristics of corrosion resistance, fatigue resistance, light dead weight and the like.
From the last 70 s, FRP cables began to be tried in bridge engineering. The first applications of this new material as a major component in building and bridge construction in the uk, usa and israel, most of the time, were glass fibre composite (GFRP). In the later 70 s, China also started to research the application of FRP guys in bridge engineering. In 1982, a simple beam highway bridge with a single span of 2017m is built in Beijing dense cloud county; in 1988, a pedestrian overpass with single span of 26m was built in Chongqing. In 1986, a first Glass Fiber Reinforced Plastic (GFRP) cable-stayed pedestrian bridge with a main span of 2714m is built; in 1992, another glass fiber reinforced plastic cable-stayed pedestrian bridge with a main span of 63m is built in great britain; manufacturing a hybrid composite cable by a winding method at the university of california in the united states for replacing 4 of 80 guys on a beach bridge; the company BASF in germany envisages the construction of bridges of l00m span using CPRP cables. In conclusion, due to the fact that CFRP has excellent performances such as light weight, high strength, corrosion resistance and fatigue resistance, the CFRP is widely popularized in the field of civil engineering at present, and is used for large-span cable-stayed bridges and suspension bridges to exert the material performance advantages, so that the problems of corrosion degradation, vibration fatigue and the like of the traditional steel cables are fundamentally solved.
At present, the FRP cable resin type is mainly thermosetting epoxy resin, and the resin can generate chemical crosslinking reaction and generate irreversible change when heated to a certain temperature. Meanwhile, chemical bonds are formed among molecular chains after curing to form a three-dimensional network structure, so that the thermosetting resin has high brittleness, poor toughness and poor fatigue resistance. In addition, thermosetting resins are also rich in a large number of functional groups such as hydroxyl groups, and react with water to form hydrogen bonds, resulting in poor durability. Compared with the prior art, the thermoplastic resin has the advantages of high toughness, humidity resistance, good fatigue resistance and the like, can be recycled, is environment-friendly and has high economic benefit. Therefore, the CFRP cable prepared by using the thermoplastic resin instead of the thermosetting resin has greater development potential in bridges and prestressed concrete structures from the analysis of both performance and economic benefit.
The FRP is an orthotropic material, the tensile strength and modulus of the FRP in the fiber direction are far greater than those in the direction perpendicular to the fiber direction, and the shear strength and the extrusion strength of the FRP are low, so that the anchoring of the fiber composite material is difficult. When the fiber composite material adopts a steel cable anchoring system, overlarge normal stress and a shear stress peak value are easily generated at the outlet of the anchorage device, so that the fiber composite material is subjected to shear failure in advance to cause anchoring failure. The development of a fiber composite anchoring system with high reliability, long service life and low cost is a key for promoting the construction of fiber composites in a long-span bridge cable and a prestressed concrete structure. The currently developed anchoring systems suitable for fiber composite materials are mainly classified into clamping type, bonding type, pin bearing type and the like according to the stress form. The clamping type anchorage device system generates friction force to anchor the fiber composite material through clamping; the clamping piece type anchorage device system generates mechanical gripping force and friction force to anchor the fiber composite material through the wedge-shaped clamping piece; the adhesive anchoring system generates adhesive force to anchor the fiber composite material through adhesive media (such as resin and cement base); the pin-bearing type anchorage device system adopts fiber sheets to form a ring around a cylinder to form a self-anchoring structure. The anchorage system does not fully consider the material characteristics of the fiber composite material, has the problems of long anchoring length, large anchorage volume, complex structural design, high processing cost, small application range and the like, and cannot be applied to bridge inhaul cables and prestressed concrete structures on a large scale.
In order to solve the anchoring problem of fiber composite materials for bridges and prestressed concrete structures, and simultaneously utilize the characteristics of excellent fracture toughness, humidity resistance, fatigue resistance, convenient processing and forming, recyclability and the like of thermoplastic resin, the invention provides a forming method and a device for preparing a composite material cable anchor member by utilizing a thermoplastic prepreg tape to prepare the composite material cable anchor member with stable size, excellent performance and a self-locking structure.
Disclosure of Invention
In view of the above, the invention aims to provide a forming device and a method for preparing a composite material cable anchor member by using a thermoplastic prepreg tape, which have the advantages of simple structure, convenience in processing, excellent forming effect, capability of forming the thermoplastic resin composite material cable anchor members with different sizes by changing the winding turns and the width of the prepreg tape, uniformity, compactness, stable size and excellent performance of the formed cable anchor member, a self-locking structure and important stress prospects in bridge inhaul cables and prestressed concrete structures.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a molding device for preparing a composite material cable anchor component by utilizing a thermoplastic prepreg tape comprises a bearing bottom plate, two transverse width-variable extrusion steel blocks, two longitudinal cylindrical section steel columns, two steel bars for adjusting the distance between the steel blocks, two semicircular steel sheets for side constraint and a plurality of wedge blocks;
six large bolt holes are formed in the bearing bottom plate, wherein four large bolt holes in the middle are used for exerting longitudinal displacement constraint, two large bolt holes on the left side and the right side are used for fixing cylinders on two sides, an arc-shaped surface is respectively processed at the junction of the front end surface and the end surfaces on two sides of each transverse variable width extrusion steel block, two long round holes which are used for steel plate sliding and correspond to the bolt holes for exerting longitudinal displacement constraint are formed in each transverse variable width extrusion steel block, the two transverse variable width extrusion steel blocks are arranged on the bearing bottom plate in a face-to-face mode through bolts, two longitudinal cylindrical steel columns are respectively fixed in the corresponding bolt holes for fixing the cylinders on two sides through bolts, steel bars for adjusting the distance between the steel blocks are arranged on the front edge and the rear edge of the bearing bottom plate and are arranged in parallel to the transverse variable width extrusion steel blocks, the steel bars for adjusting the steel block spacing are provided with transverse bolt holes for adjusting the steel block spacing, the distance between two transverse variable width extrusion steel blocks is adjusted by matching transverse bolts in the transverse bolt holes for adjusting the steel block spacing, a plurality of circles of thermoplastic resin composite material prepreg tapes are wound on two longitudinal cylindrical section steel columns to form thermoplastic resin composite material prepreg beltings, and the prepreg beltings are restrained by two lateral restraining semicircular steel sheets and a plurality of wedge blocks are inserted into gaps between the prepreg beltings and the transverse variable width extrusion steel blocks on the corresponding sides.
Further, the structural dimensions of the two transverse variable width extruded steel blocks are the same, and the bonding angle of the thermoplastic composite cable anchor member formed by extruding the thermoplastic resin composite prepreg belt by the two transverse variable width extruded steel blocks is 27.0 degrees, 33.4 degrees or 43.6 degrees.
Furthermore, two transverse bolt holes for adjusting the steel block spacing are formed in each steel bar for adjusting the steel block spacing, and a transverse bolt is matched in each transverse bolt hole for adjusting the steel block spacing, so that the free end of each transverse bolt abuts against the rear end face of the corresponding transverse variable-width extrusion steel block.
Furthermore, one end of the thermoplastic resin composite prepreg tape is fixed, and the other end of the thermoplastic resin composite prepreg tape sequentially and repeatedly and circularly bypasses two longitudinal cylindrical section steel columns for multiple times, and is wound layer by layer to form the thermoplastic resin composite prepreg tape.
Furthermore, three vertical bolt holes for fixing the steel bars are formed in each steel bar for adjusting the distance between the steel blocks, and the bolts penetrate through the vertical bolt holes for fixing the steel bars to fix and adjust the steel bars for adjusting the distance between the steel blocks.
Furthermore, three small bolt holes for connecting with steel bars for adjusting the spacing between the steel blocks on the corresponding side are respectively arranged on the front side and the rear side of the bearing bottom plate.
Furthermore, a through threaded hole is formed in the axis of each longitudinal cylindrical section steel column.
A molding method for preparing a composite material cable anchor member by using a thermoplastic prepreg tape is used for molding the cable anchor member by using the molding device and comprises the following specific steps:
step one, cleaning impurities of a bearing bottom plate, a longitudinal cylindrical steel column, a transverse variable-width extrusion steel block, a steel bar for adjusting the distance between the steel blocks, a semicircular steel sheet for side constraint and a wedge block by adopting alcohol, and reserving after cleaning;
step two, cutting the thermoplastic resin composite material prepreg tape into long strips along the fiber direction through manual measurement and cutting; installing two longitudinal cylindrical steel columns, two steel bars for adjusting the distance between the steel blocks and two transverse width-variable extrusion steel blocks on a bearing bottom plate by bolts, and spraying a release agent on the surfaces of the two longitudinal cylindrical steel columns and the two transverse width-variable extrusion steel blocks, which are in contact with the thermoplastic resin composite prepreg tape;
fixing one end of the thermoplastic resin composite prepreg tape, and winding the other end of the thermoplastic resin composite prepreg tape layer by layer along two longitudinal cylindrical steel columns to form a thermoplastic resin composite prepreg tape; a certain gap is reserved between two adjacent layers of wound thermoplastic resin composite prepreg tapes, so that the prepreg tapes are convenient to fix later and tightly adhere between layers after being heated;
rotating the transverse bolts on the steel bars for adjusting the spacing between the steel blocks at two sides, abutting the transverse bolts against the transverse variable-width extrusion steel blocks at the corresponding sides, and tightening the non-tightened thermoplastic resin composite preimpregnated belt belts until the transverse bolts rotate to be incapable of being screwed again;
fifthly, installing semicircular steel sheets for side surface restraint on the outer sides of arc-shaped parts at two ends of the thermoplastic resin composite material prepreg belt; inserting a wedge block into a gap between the transverse variable-width extruded steel block and the prepreg belt;
sixthly, placing the thermoplastic resin composite material preimpregnated belt positioned on the forming device and the forming device into a high-temperature furnace, heating to a temperature higher than the melting point of resin, and heating for a period of time until the thermoplastic resin composite material cable anchor member is formed by heating and forming;
and seventhly, after the heating forming is finished, all transverse bolts on the steel bars for adjusting the steel block spacing and all bolts on the bearing bottom plate are dismounted, the thermoplastic resin composite material cable anchor member clamped by the longitudinal cylindrical steel columns on the two sides and the two transverse width-variable extrusion steel blocks is taken down from the bearing bottom plate, and after the temperature is reduced, the longitudinal cylindrical steel columns and the transverse width-variable extrusion steel blocks are removed, and the thermoplastic composite material cable anchor member is taken out.
Further, the heating temperature and the heating time in the high-temperature furnace are determined according to the melting temperature of the thermoplastic resin, ensuring that the heating temperature is higher than the melting temperature of the thermoplastic resin.
Further, the thermoplastic resin material is polypropylene, and the thermoplastic composite material cable anchor member is formed by heating and molding in a high-temperature furnace at the heating temperature of 180 ℃ for 30 minutes.
Compared with the prior art, the forming device and the method for preparing the composite material cable anchor member by using the thermoplastic prepreg tape have the following advantages:
(1) the invention utilizes the principle of thermoplastic resin heating, melting and cooling molding, the thermoplastic prepreg tape is wound to a molding device and then is placed in a high-temperature furnace to be heated to the temperature higher than the melting point of the resin, and a composite material cable anchor component with stable size, excellent performance and a self-locking structure is prepared by exerting the constraint action in the melting process and is used for bridge cables and prestressed concrete structures to solve the anchoring problem of the composite material.
(2) The forming device changes the thickness of the prepreg tape and the angle of a bonding part through the slidable transverse variable width extrusion steel block, is simple in design and convenient to process, changes the winding turns (thickness) of the prepreg tape inhaul cable according to the change of the interval of the transverse variable width extrusion steel block, and is wide in application range.
(3) The transverse bolt and the fixing bolt can ensure that the cable anchor component and the bearing bottom plate are tightly fixed together, so that the thermoplastic resin can not permeate into the transverse variable-width extruded steel block and the bearing bottom plate after being melted, and the cable anchor component has good dimensional stability.
(4) The semicircular steel sheet and the wedge block for side constraint, which are applied to the side surface in the melting process of the thermoplastic resin, can apply effective extrusion force on the prepreg belt, and the uniformity and the compactness of the prepared cable anchor member are ensured under the action of gravity.
(5) The molding device has the advantages of simple structure, convenient processing, excellent molding effect, uniform and compact components, stable size and wide application range, and can mold the thermoplastic resin composite cable anchor components with different thicknesses and bonding angles.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic structural view of a molding apparatus for making a composite anchor cable member using a thermoplastic prepreg tape according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a load-bearing base plate according to an embodiment of the present invention;
FIG. 3 is a schematic representation of a transverse variable width extruded steel block forming three different bonding angles for a thermoplastic composite cable anchor member.
Description of reference numerals:
1-adjusting transverse bolt holes for steel block spacing, 2-transversely variable width extruded steel blocks, 3-bearing bottom plates, 4-longitudinal cylindrical section steel columns, 5-laterally restraining semicircular steel plates, 6-thermoplastic resin composite material preimpregnated belt cable anchor members, 7-long round holes for steel plate sliding, 8-adjusting steel block spacing steel plates, 9-fixing steel bar vertical bolt holes, 10-applying longitudinal displacement restraining bolt holes, 11-wedge blocks and 12-fixing bolt holes for cylinders on two sides.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in fig. 1-3, a molding device for manufacturing a composite material cable anchor member by using a thermoplastic prepreg tape comprises a bearing bottom plate 3, two transverse variable width extruded steel blocks 2, two longitudinal cylindrical steel columns 4, two steel bars 8 for adjusting the distance between the steel blocks, two semicircular steel sheets 5 for lateral constraint and a plurality of wedges 11;
six large bolt holes are formed in the bearing bottom plate 3, wherein four large bolt holes in the middle are bolt holes 10 for applying longitudinal displacement constraint, two large bolt holes in the left side and the right side are bolt holes 12 for fixing cylinders on two sides, an arc surface is respectively processed at the junction of the front end surface and the end surfaces on two sides of each transverse variable width extrusion steel block 2, two long round holes 7 for steel plate sliding corresponding to the bolt holes 10 for applying longitudinal displacement constraint are arranged on each transverse variable width extrusion steel block 2, the two transverse variable width extrusion steel blocks 2 are arranged on the bearing bottom plate 3 face to face through bolts, two longitudinal cylindrical steel columns 4 are respectively fixed in the corresponding bolt holes 12 for fixing cylinders on two sides through bolts, two steel bars 8 for adjusting the distance between the steel blocks are arranged at the front edge and the rear edge of the bearing bottom plate 3 and are arranged in parallel with the transverse variable width extrusion steel blocks 2, the steel bar 8 for adjusting the steel block spacing is provided with a transverse bolt hole 1 for adjusting the steel block spacing, the distance between two transverse variable width extruded steel blocks 2 is adjusted by matching a transverse bolt in the transverse bolt hole 1 for adjusting the steel block spacing, a plurality of circles of thermoplastic resin composite prepreg tapes are wound on two longitudinal cylindrical steel columns 4 to form thermoplastic resin composite prepreg belting, and the prepreg belting is restrained by two semicircular steel sheets 5 for side restraint and a plurality of wedge blocks 11 are inserted into gaps between the prepreg belting and the transverse variable width extruded steel blocks on the corresponding side.
Fixing two transverse width-variable extrusion steel blocks 2, two longitudinal cylindrical steel columns 4 and two steel bars 8 for adjusting the distance between the steel blocks to a bearing bottom plate 3 through bolts, and ensuring that the transverse width-variable extrusion steel blocks 2 slide freely; the transverse bolts at the two sides can control the sliding of the transverse variable width extrusion steel blocks 2 and change the distance between the two transverse variable width extrusion steel blocks 2, thereby effectively controlling the thickness of the prepreg belt; the angle of the joint part of the prepreg belt is adjusted by changing the length of the transverse variable-width extrusion steel block 2, so that the stress of the prepreg belt anchor cable component is stable, and the preparation of the cable anchor component with any thickness and angle is realized; specifically, the two transverse variable width extruded steel blocks 2 of the present application have the same structural dimensions, and the bonding angle of the thermoplastic composite cable anchor member 6 formed by extruding the thermoplastic resin composite prepreg tape from the two transverse variable width extruded steel blocks 2 is 27.0 °, 33.4 °, or 43.6 °.
Two transverse bolt holes 1 for adjusting the steel block spacing are formed in each steel bar 9 for adjusting the steel block spacing, and a transverse bolt is matched in each transverse bolt hole 1 for adjusting the steel block spacing, so that the free end of each transverse bolt abuts against the rear end face of the corresponding transverse variable-width extrusion steel block.
One end of the thermoplastic resin composite prepreg tape is fixed, and the other end of the thermoplastic resin composite prepreg tape circularly bypasses two longitudinal cylindrical section steel columns in sequence and for multiple times, and is wound layer by layer to form the thermoplastic resin composite prepreg tape.
Three vertical bolt holes 9 for fixing the steel bars are arranged on each steel bar 8 for adjusting the steel block interval, and the bolts penetrate through the vertical bolt holes 9 for fixing the steel bars to fix the steel bars 8 for adjusting the steel block interval. Three small bolt holes for connecting with the steel bars 8 for adjusting the steel block spacing at the corresponding side are respectively arranged at the front side and the rear side of the bearing bottom plate 3. And a through threaded hole is formed in the axis of each longitudinal cylindrical steel column 4.
A molding method for preparing a composite material cable anchor member by utilizing a thermoplastic prepreg tape adopts the molding device to mold the cable anchor member, and comprises the following specific steps:
step one, cleaning impurities of a bearing bottom plate 3, a longitudinal cylindrical steel column 4, a transverse variable-width extrusion steel block 2, a steel bar 8 for adjusting the distance between the steel blocks, a semicircular steel sheet 5 for side constraint and a wedge block 11 by adopting alcohol, and reserving after cleaning;
step two, cutting the thermoplastic resin composite material prepreg tape into long strips along the fiber direction through manual measurement and cutting; installing two longitudinal cylindrical steel columns 4, two steel bars 8 for adjusting the distance between the steel blocks and two transverse width-variable extrusion steel blocks 2 on a bearing bottom plate 3 by bolts, and spraying a release agent on the surfaces of the two longitudinal cylindrical steel columns 4 and the two transverse width-variable extrusion steel blocks 2, which are in contact with the thermoplastic resin composite material prepreg tape;
fixing one end of the thermoplastic resin composite prepreg tape, and winding the other end of the thermoplastic resin composite prepreg tape (namely, the prepreg tape impregnated with the thermoplastic resin material) layer by layer along two longitudinal cylindrical steel columns to form a thermoplastic resin composite prepreg belt; a certain gap is reserved between two adjacent layers of wound thermoplastic resin composite prepreg tapes, so that the prepreg tapes are convenient to fix later and tightly adhere between layers after being heated;
rotating the transverse bolts on the steel bars 8 for adjusting the steel block spacing at two sides, abutting the transverse bolts against the transverse variable-width extrusion steel blocks 2 at the corresponding sides, and tightening the thermoplastic resin composite preimpregnated belt belts which are not tightened until the transverse bolts rotate to be incapable of being screwed any more;
fifthly, installing semicircular steel sheets for side surface restraint on the outer sides of arc-shaped parts at two ends of the thermoplastic resin composite material prepreg belt; inserting a wedge block into a gap between the transverse variable-width extruded steel block and the prepreg belt; reducing side deformation during prepreg belt molding; the side surface of the finished product is smooth, the internal defects are few, the structure is stable, and the tensile strength is increased;
sixthly, placing the thermoplastic resin composite material preimpregnated belt positioned on the forming device and the forming device into a high-temperature furnace, heating to the temperature above the melting point of the resin, and heating for a period of time until the thermoplastic resin composite material cable anchor member 6 is formed by heating and forming; the heating temperature and the heating time in the high-temperature furnace are determined according to the melting temperature of the thermoplastic resin, and the heating temperature is ensured to be higher than the melting temperature of the thermoplastic resin; the method specifically comprises the following steps: the thermoplastic resin material is polypropylene, the heating temperature is 180 degrees in a high-temperature furnace, the heating time is 30 minutes, and the thermoplastic composite material cable anchor component 6 is formed by heating and molding;
and seventhly, after the heating forming is finished, all transverse bolts on the steel bars 8 for adjusting the steel block spacing and all bolts on the bearing bottom plate 3 are dismounted, the thermoplastic resin composite material cable anchor members 6 clamped by the longitudinal cylindrical steel columns 4 and the two transverse width-variable extrusion steel blocks 2 on two sides are taken down from the bearing bottom plate 3, and after the temperature is reduced, the longitudinal cylindrical steel columns 4 and the transverse width-variable extrusion steel blocks 2 are removed, and the thermoplastic composite material cable anchor members 6 are taken out.
The invention provides a simple device which fully considers the difficulty in the preparation of the existing process for simultaneously changing the thickness of the thermoplastic resin composite material inhaul cable and the angle of the bonding part.
According to the invention, a corresponding bearing bottom plate 3, a longitudinal cylindrical steel column 4 and a transverse width-variable extrusion steel block 2 are processed according to the thickness requirement of a thermoplastic resin composite material cable anchor member 6; the cutting direction of the prepreg belt is ensured to be along the fiber direction, the cutting error is required to meet the precision requirement (within +/-1 mm), and the cutting length and width are determined according to the size of the composite material cable anchor structure.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A molding device for preparing a composite material cable anchor member by utilizing a thermoplastic prepreg tape is characterized in that: the steel bar adjusting device comprises a bearing bottom plate (3), two transverse width-variable extrusion steel blocks (2), two longitudinal cylindrical section steel columns (4), two steel bars (8) for adjusting the distance between the steel blocks, two semicircular steel sheets (5) for lateral restraint and a plurality of wedges (11);
six large bolt holes are formed in a bearing bottom plate (3), wherein four large bolt holes in the middle are bolt holes (10) for applying longitudinal displacement constraint, two large bolt holes in the left side and the right side are bolt holes (12) for fixing cylinders on two sides, an arc-shaped surface is respectively processed at the junction of the front end surface and the end surfaces on two sides of each transverse variable-width extrusion steel block (2), two long round holes (7) which correspond to the bolt holes (10) for applying longitudinal displacement constraint and are used for sliding steel plates are arranged on each transverse variable-width extrusion steel block (2), the two transverse variable-width extrusion steel blocks (2) are arranged on the bearing bottom plate (3) in a face-to-face mode through bolts, two longitudinal cylindrical steel columns (4) are respectively fixed in the bolt holes (12) for fixing the cylinders on two sides and are correspondingly arranged on two sides of the bearing bottom plate (3) through bolts, and two steel bars (8) for adjusting the distance between the steel blocks are arranged at the front edge and the back edge of the bearing bottom plate (3), the steel bars (8) for adjusting the steel block spacing are provided with transverse bolt holes (1), the distance between the two transverse variable width extrusion steel blocks (2) is adjusted by matching transverse bolts in the transverse bolt holes (1) for adjusting the steel block spacing, a plurality of circles of thermoplastic resin composite prepreg tapes are wound on the two longitudinal cylindrical steel columns (4) to form thermoplastic resin composite prepreg beltings, the prepreg beltings are restrained by the two semicircular steel sheets (5) for side restraint, and a plurality of wedges (11) are inserted into gaps between the prepreg beltings and the transverse variable width extrusion steel blocks on the corresponding sides.
2. The apparatus for forming a composite cable anchor member using a thermoplastic prepreg tape as claimed in claim 1, wherein: the structural sizes of the two transverse variable width extrusion steel blocks (2) are the same, and the bonding angle of the thermoplastic composite cable anchor member (6) formed by extruding the thermoplastic resin composite prepreg belt by the two transverse variable width extrusion steel blocks (2) is 27.0 degrees, 33.4 degrees or 43.6 degrees.
3. The apparatus for forming a composite cable anchor member using a thermoplastic prepreg tape as claimed in claim 1, wherein: two transverse bolt holes (1) for adjusting the steel block distance are formed in each steel bar (9) for adjusting the steel block distance, a transverse bolt is matched in each transverse bolt hole (1) for adjusting the steel block distance, and the free end of each transverse bolt abuts against the rear end face of the corresponding transverse variable-width extrusion steel block.
4. The apparatus for forming a composite cable anchor member using a thermoplastic prepreg tape as claimed in claim 1, wherein: one end of the thermoplastic resin composite prepreg tape is fixed, and the other end of the thermoplastic resin composite prepreg tape circularly bypasses two longitudinal cylindrical section steel columns in sequence and for multiple times, and is wound layer by layer to form the thermoplastic resin composite prepreg tape.
5. The apparatus for forming a composite cable anchor member using a thermoplastic prepreg tape as claimed in claim 1, wherein: three vertical bolt holes (9) for fixing the steel bars are arranged on each steel bar (8) for adjusting the steel block interval, and the bolts penetrate through the vertical bolt holes (9) for fixing the steel bars to fix the steel bars (8) for adjusting the steel block interval.
6. The apparatus for forming a composite cable anchor member using a thermoplastic prepreg tape as claimed in claim 5, wherein: three small bolt holes used for connecting with steel bars (8) for adjusting the spacing between the steel blocks on the corresponding side are respectively arranged at the front side and the rear side of the bearing bottom plate (3).
7. The apparatus for forming a composite cable anchor member using a thermoplastic prepreg tape as claimed in claim 1, wherein: and a through threaded hole is formed in the axis of each longitudinal cylindrical section steel column (4).
8. A molding method for preparing a composite material cable anchor component by utilizing a thermoplastic prepreg tape is characterized by comprising the following steps of: use of a forming device according to any one of claims 1-7 for forming a cable anchor member, comprising the steps of:
step one, cleaning impurities of a bearing bottom plate (3), a longitudinal cylindrical steel column (4), a transverse variable-width extrusion steel block (2), a steel bar (8) for adjusting the distance between the steel blocks, a semicircular steel sheet (5) for side constraint and a wedge block (11) by adopting alcohol, and reserving after cleaning;
step two, cutting the thermoplastic resin composite material prepreg tape into long strips along the fiber direction through manual measurement and cutting; mounting two longitudinal cylindrical steel columns (4), two steel bars (8) for adjusting the distance between the steel blocks and two transverse width-variable extrusion steel blocks (2) on a bearing bottom plate (3) by bolts, and spraying a release agent on the surfaces of the two longitudinal cylindrical steel columns (4) and the two transverse width-variable extrusion steel blocks (2) which are in contact with a thermoplastic resin composite prepreg tape;
fixing one end of the thermoplastic resin composite prepreg tape, and winding the other end of the thermoplastic resin composite prepreg tape layer by layer along two longitudinal cylindrical steel columns to form a thermoplastic resin composite prepreg tape; a certain gap is reserved between two adjacent layers of wound thermoplastic resin composite prepreg tapes, so that the prepreg tapes are convenient to fix later and tightly adhere between layers after being heated;
rotating the transverse bolts on the steel bars (8) for adjusting the spacing between the steel blocks at two sides, abutting the transverse bolts against the transverse variable-width extrusion steel blocks (2) at the corresponding sides, and tightening the untensioned thermoplastic resin composite preimpregnated belt belts until the transverse bolts rotate to be incapable of being screwed again;
fifthly, installing semicircular steel sheets for side surface restraint on the outer sides of arc-shaped parts at two ends of the thermoplastic resin composite material prepreg belt; inserting a wedge block into a gap between the transverse variable-width extruded steel block and the prepreg belt;
sixthly, placing the thermoplastic resin composite material preimpregnated belt positioned on the forming device and the forming device into a high-temperature furnace, heating to the temperature above the melting point of the resin, and heating for a period of time until the thermoplastic resin composite material cable anchor member (6) is formed by heating and forming;
and seventhly, after the heating forming is finished, all transverse bolts on the steel bars (8) for adjusting the steel block spacing and all bolts on the bearing bottom plate (3) are dismounted, the thermoplastic resin composite material cable anchor members (6) clamped by the longitudinal cylindrical steel columns (4) on the two sides and the two transverse width-variable extrusion steel blocks (2) are taken down from the bearing bottom plate (3), and after the temperature is reduced, the longitudinal cylindrical steel columns (4) and the transverse width-variable extrusion steel blocks (2) are removed to take out the thermoplastic composite material cable anchor members (6).
9. The method of claim 8, wherein the step of forming the composite anchor member comprises: the heating temperature and the heating time in the high-temperature furnace are determined according to the melting temperature of the thermoplastic resin, and the heating temperature is ensured to be higher than the melting temperature of the thermoplastic resin.
10. The method of forming a composite cable anchor member using a thermoplastic prepreg tape as claimed in claim 9, wherein: the thermoplastic resin material is polypropylene, the heating temperature is 180 ℃ in a high-temperature furnace, the heating time is 30 minutes, and the thermoplastic composite material cable anchor component (6) is formed by heating and molding.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111130457.0A CN113942247A (en) | 2021-09-26 | 2021-09-26 | Forming device and method for preparing composite material cable anchor component by utilizing thermoplastic prepreg tape |
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| CN202111130457.0A CN113942247A (en) | 2021-09-26 | 2021-09-26 | Forming device and method for preparing composite material cable anchor component by utilizing thermoplastic prepreg tape |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115233665A (en) * | 2022-07-20 | 2022-10-25 | 哈尔滨工业大学 | Pre-extrusion-bonding type anchoring system and method for thermoplastic resin-based FRP (fiber reinforced Plastic) rod |
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