CN-121973432-A - U-shaped stirrup heating-bending integrated device for fiber reinforced thermoplastic resin composite material rib and bending method

CN121973432ACN 121973432 ACN121973432 ACN 121973432ACN-121973432-A

Abstract

The invention provides a U-shaped stirrup heating-bending integrated device and a bending method for a fiber reinforced thermoplastic resin composite material bar, and belongs to the field of stirrup heating-bending devices. Solves the problems that the existing bending device has low heating-bending efficiency, can not prepare stirrups with different bending angles, can not meet the requirement of on-site rapid bending and the like. The device comprises a platform, two synchronous guide rails, a semi-open heating cabin, two sliding feeding brackets, a U-shaped stirrup die, two spiral angle discs and two bending columns, wherein the semi-open heating cabin is installed on the platform, the two sliding feeding brackets are located at two sides of the semi-open heating cabin, one side of each synchronous guide rail is correspondingly connected with each of the two sliding feeding brackets, the sliding feeding brackets are driven to move, the other side of each synchronous guide rail is located at two sides of the U-shaped stirrup die, the two spiral angle discs are correspondingly arranged in front of each synchronous guide rail, and the bending columns are installed on the spiral angle discs. The process is integrated and automatically controlled, so that the repeated carrying in the traditional process is avoided, and the strength loss is reduced.

Inventors

LI CHENGGAO
PENG ZHAN
ZHANG ZHUO
LIU ZIYANG
CHEN MEILIANG
XIAN GUIJUN
WANG ANJI
BAI YANBO
WANG JIANLING
TIAN LINGYU
ZHANG PUXUAN
PAN YUNFENG

Assignees

哈尔滨工业大学

Dates

Publication Date: 20260505
Application Date: 20260319

Claims (9)

1. The U-shaped stirrup heating-bending integrated device for the fiber reinforced thermoplastic resin composite material bars is characterized by comprising a platform, two synchronous guide rails (1), a semi-open heating cabin (2), two sliding feeding brackets (4), a U-shaped stirrup die (5), two spiral angle discs (6) and two bending columns (7), wherein the semi-open heating cabin (2) is installed on the platform, the two sliding feeding brackets (4) are positioned on two sides of the semi-open heating cabin (2), one side of the two synchronous guide rails (1) is correspondingly connected with the two sliding feeding brackets (4) to drive the sliding feeding brackets (4) to move, the other side of the two synchronous guide rails are positioned on two sides of the U-shaped stirrup die (5), the two spiral angle discs (6) are correspondingly arranged in front of the two synchronous guide rails (1), and the bending columns (7) are installed on the spiral angle discs (6).
2. The U-shaped stirrup heating-bending integrated device for fiber reinforced thermoplastic resin composite bars according to claim 1, wherein the semi-open heating chamber (2) is C-shaped, and the opening direction faces to the U-shaped stirrup mold (5).
3. The U-shaped stirrup heating-bending integrated device for the fiber reinforced thermoplastic resin composite bar according to claim 2 is characterized in that a plurality of heating rods (3) are arranged in the semi-open heating cabin (2).
4. The U-shaped stirrup heating-bending integrated device for fiber reinforced thermoplastic resin composite bars according to claim 1, wherein the slip feed bracket (4) is L-shaped.
5. The U-shaped stirrup heating-bending integrated device for fiber reinforced thermoplastic resin composite bars according to claim 4, wherein a plurality of grooves are formed in the sliding feeding bracket (4).
6. The U-shaped stirrup heating-bending integrated device for fiber reinforced thermoplastic resin composite bars according to claim 1, wherein the U-shaped stirrup mold (5) comprises a semicircular body and a baffle plate, and the baffle plate is arranged above the semicircular body.
7. The U-shaped stirrup heating-bending integrated device for fiber reinforced thermoplastic resin composite bars according to claim 1, wherein grooves in different positions are formed in the spiral angle disc (6), and bending columns (7) are inserted into the grooves according to bending effects.
8. An assembling method of the U-shaped stirrup heating-bending integrated device for fiber reinforced thermoplastic resin composite bars as set forth in any one of claims 1 to 7, characterized by comprising the following steps: Firstly, selecting a corresponding U-shaped stirrup mould (5), a spiral angle disc (6) and a bending column (7) according to the requirement, placing the bending column (7) into a groove of the spiral angle disc (6), electrifying the spiral angle disc (6), rotating the bending column (7) to a horizontal angle, and placing the U-shaped stirrup mould (5) in front of the spiral angle disc (6); the two sides of the sliding feeding brackets (4) are placed in the synchronous guide rail (1), the semi-open heating cabin (2) is placed in the middle of the sliding feeding brackets (4), and the heating rod (3) is inserted, so that the U-shaped stirrup heating-bending integrated device is assembled.
9. A bending method using the U-shaped stirrup heating-bending integrated device for fiber reinforced thermoplastic resin composite bars as set forth in any one of claims 1 to 7, characterized by comprising the steps of: Firstly, heating a heating rod (3) to enable the heating rod to reach the softening temperature of thermoplastic resin, placing fiber reinforced thermoplastic resin composite material straight ribs into a semi-open heating cabin (2) along grooves of sliding feeding brackets (4) at two sides, and after the fiber reinforced thermoplastic resin composite material straight ribs are softened, starting a synchronous guide rail (1) to enable the fiber reinforced thermoplastic resin composite material straight ribs to drive the sliding feeding brackets (4) to slide so as to drive the straight ribs to move; step 2, after the straight bars are sent into a U-shaped stirrup mold (5), the sliding feeding bracket (4) returns to the original position along the synchronous guide rail (1), and a new batch of fiber reinforced thermoplastic resin composite straight bars are put in for heating; And 3, finally, starting the spiral angle disc (6), enabling the spiral angle disc (6) to rotate 90 degrees around the spiral angle disc, driving the bending column (7) to descend, continuing to descend after attaching the composite material straight ribs, bending into thermoplastic composite material U-shaped stirrups, and after the thermoplastic composite material U-shaped stirrups are cooled and hardened, enabling the spiral angle disc (6) to rotate anticlockwise for 90 degrees for homing, and taking down the fiber reinforced thermoplastic resin composite material U-shaped stirrups from the U-shaped stirrup die (5).

Description

U-shaped stirrup heating-bending integrated device for fiber reinforced thermoplastic resin composite material rib and bending method Technical Field The invention belongs to the field of stirrup heating-bending devices, and particularly relates to a U-shaped stirrup heating-bending integrated device for a fiber reinforced thermoplastic resin composite material rib and a bending method. Background Fiber reinforced resin matrix composite bars (FRP bars) are ideal materials for replacing reinforcing bars by virtue of the characteristics of light weight, high strength (the density is only 1/7~1/5 of steel), excellent corrosion resistance (chloride ion resistance and salt spray corrosion resistance), good fatigue resistance (the fatigue strength reaches 75% of the tensile strength) and the like. The thermal expansion coefficient of the concrete is highly matched with that of the concrete, so that the cooperative work is ensured to have no temperature stress damage. The service life of the structure can be prolonged by 2-3 times when the steel bar is applied to bridges and ocean engineering, the cost of the whole life cycle is reduced by 30%, and the engineering failure problem caused by corrosion of the steel bars is solved. Thermoplastic resins (e.g., polypropylene, acrylic) possess reversible physical phase change properties such as heat softening-plastic flow-cooling hardening-strength recovery, supporting multiple remodelling. The elongation at break (> 200%) is significantly higher than that of thermosetting resins (< 5%), more suitable for bending processing. In addition, thermoplastic resins are recyclable (by melt reconstruction), while thermosetting resins are not recyclable due to the three-dimensional crosslinked network. In the aspect of chemical resistance, the thermoplastic resin has extremely low water absorption and strong acid and alkali corrosion resistance, and is suitable for a wet corrosion environment. Compared with steel hoops, the thermoplastic hoops have corrosion resistance, the resin completely isolates moisture and corrosive media, concrete cracking caused by corrosion of the steel hoops is avoided, the weight is reduced, the density is only 1/5 of that of steel, the load of the steel is reduced, site cold bending (90-135 ℃) is supported without cracking, the comprehensive cost is high, the anticorrosion treatment is avoided, the maintenance cost is low, and the total life cycle cost is reduced by 30%. At present, the preparation and performance defects of fiber reinforced thermoplastic resin composite stirrups at home and abroad have the defects of easy interfacial debonding when polypropylene is bent, low process efficiency, multistage winding-melting-cooling processes, insufficient continuity degree, insufficient temperature control precision, insufficient resin softening and the like caused by uneven heating, and other bending devices have the problems of low heating-bending efficiency, incapability of preparing stirrups with different bending angles, incapability of meeting on-site rapid bending and the like. Therefore, it is necessary to develop a U-shaped stirrup heating-bending integrated device of fiber reinforced thermoplastic resin composite material, which breaks through the bottlenecks of interface reinforcement, integrated continuous production, intelligent temperature control and the like to realize engineering popularization. Disclosure of Invention In view of the above, the heating-bending device aims to solve the problems that the existing bending device is low in heating-bending efficiency, stirrups with different bending angles cannot be prepared, and rapid on-site bending cannot be met. The invention provides a U-shaped stirrup heating-bending integrated device and a bending method for a fiber reinforced thermoplastic resin composite material rib. The U-shaped stirrup heating-bending integrated device for the fiber reinforced thermoplastic resin composite bar comprises a platform, two synchronous guide rails, a semi-open heating cabin, two sliding feeding brackets, a U-shaped stirrup die, two spiral angle discs and two bending columns, wherein the semi-open heating cabin is arranged on the platform, the two sliding feeding brackets are positioned on two sides of the semi-open heating cabin, one side of each synchronous guide rail is correspondingly connected with the two sliding feeding brackets, the sliding feeding brackets are driven to move, the other side of each synchronous guide rail is positioned on two sides of the U-shaped stirrup die, the two spiral angle discs are correspondingly arranged in front of each synchronous guide rail, and the bending columns are arranged on the spiral angle discs. Furthermore, the semi-open heating cabin is C-shaped, and the opening direction faces the U-shaped stirrup mold. Furthermore, a plurality of heating rods are arranged in the semi-open heating cabin. Further, the sliding feeding bracket is L-shaped. Further, a plura