Production device and method for stirrups

Abstract

The invention discloses a stirrup production device and method, and relates to the technical field of composite material stirrup production. The device is used for processing a thermoplastic prepreg tape into a stirrup and comprises a fixed mold and a movable mold, a winding shaft is arranged on one side of the fixed mold, a certain distance exists between the winding shaft and the periphery of the fixed mold, the movable mold surrounds the outer side of the winding shaft, a winding cavity is formed among the movable mold, the fixed mold and the winding shaft, and the thermoplastic prepreg tape is located in the winding cavity. And the winding shaft is wound. According to the stirrup production device provided by the invention, the thermoplastic prepreg tape is wound on the winding shaft, and the movable mold surrounds the outer side of the wound thermoplastic prepreg tape, so that the winding effect of the thermoplastic prepreg tape is ensured, the sealing effect of the stirrup is further ensured, and the overall tensile property of the stirrup is improved.

Description

Technical Field

[0001] The invention relates to the technical field of composite material stirrup production, and more particularly to a stirrup production device and method. Background Art

[0002] During the service of reinforced concrete structures, the service performance deteriorates prematurely due to steel corrosion, causing insufficient reliability and safety hazards of the structure. Improving the service life of reinforced concrete structures is the key to achieving national sustainable development. Using lightweight, high-strength and durable fiber-reinforced resin composites (FRP) to reasonably replace steel bars with low strength and serious corrosion problems in concrete structures is expected to achieve high performance and long life of the structure, improve the safety and durability of engineering structure service, and achieve lightweight and low-load design of engineering structures.

[0003] Continuous fiber reinforced resin composite materials have the characteristics of light weight, high strength, and corrosion resistance. They can replace steel bars in the construction of concrete structures in corrosive environments and effectively solve the problem of steel bar corrosion. At present, fiber reinforced composites mainly include glass fiber, carbon fiber reinforced thermosetting and thermoplastic resin composites. Among them, thermosetting composite bars cannot be bent on site according to construction requirements after forming, which seriously affects construction. Thermoplastic resin matrix has the advantages of repeated molding, high toughness, and good durability.

[0004] The shear resistance in concrete structures is mainly provided by stirrups, but the existing fiber-reinforced composite stirrup forming technology is immature. Thermosetting composite reinforcements cannot be bent and cannot be used as stirrups; after thermoplastic composite reinforcements are bent and formed, fiber dislocation and crack damage occur in the bending area, seriously reducing the tensile performance of the stirrups. In addition, the existing composite stirrups are not closed, and the overall tensile performance of the stirrups is poor.

[0005] It can be seen that closed fiber reinforced thermoplastic composite stirrups have broad application prospects in the field of civil engineering, but the preparation of closed thermoplastic composite stirrups without damage in the bending zone is still a key problem to be solved. Therefore, in order to further promote the application of thermoplastic composite stirrups in the field of concrete structures, a production device and method that can realize closed fiber reinforced thermoplastic composite stirrups is urgently needed. Summary of the invention

[0006] In view of this, the present invention provides a production device and method for stirrups to solve the problem that the existing composite stirrups are not closed and the overall tensile performance of the stirrups is poor. In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0007] In one aspect, the present invention provides a stirrup production device for processing a thermoplastic prepreg tape into a stirrup, comprising:

[0008] A fixed mold, wherein a winding shaft is arranged on one side of the fixed mold, and a certain distance exists between the winding shaft and the surrounding of the fixed mold;

[0009] A movable mold is enclosed on the outside of the winding shaft, a winding cavity is formed between the movable mold, the fixed mold and the winding shaft, and the thermoplastic prepreg tape is located in the winding cavity and is wound on the winding shaft.

[0010] Furthermore, a baffle is provided at one end of the winding shaft away from the fixed mold, a winding cavity is formed among the movable mold, the fixed mold, the winding shaft and the baffle, and the thermoplastic prepreg tape is located in the winding cavity and is wound on the winding shaft.

[0011] Furthermore, two fixed molds are provided, and one end of the winding shaft is arranged opposite to each other. A threaded hole is provided on the fixed mold, and the two fixed molds are connected by fixing bolts. A winding cavity is formed between the two fixed molds, the two winding shafts and the movable mold, and the thermoplastic prepreg tape is located in the winding cavity and is wound around the two winding shafts.

[0012] Furthermore, the movable mold is connected end to end by connecting bolts to form a ring body.

[0013] Furthermore, the movable mold includes a plurality of segmented molds, and the plurality of segmented molds are sequentially connected end to end through connecting bolts to form a closed ring body.

[0014] In another aspect, the present invention provides a method for producing stirrups, wherein the method uses the stirrup production device, and the method comprises the following steps:

[0015] S10: clean the impurities on the fixed mold and the movable mold, wipe them clean with anhydrous ethanol, and apply a release agent on the outer walls of the fixed mold and the movable mold;

[0016] S20: splicing a pair of fixed molds together to form a stirrup forming notch in the middle;

[0017] S30: Winding the thermoplastic prepreg tape on a winding shaft of a fixed mold;

[0018] S40: fastening the thermoplastic prepreg tape to the fixed mold using a movable mold;

[0019] S50: placing the entire device in an oven for two hours so that the thermoplastic prepreg tape is melted into a whole, and the oven temperature is between the melting temperature and the decomposition temperature of the thermoplastic resin;

[0020] S60: Take out the device, and after the temperature cools down to room temperature, remove the mold and take out the stirrups.

[0021] It can be seen from the above technical scheme that compared with the prior art, the present invention discloses a production device for stirrups, which is used to prepare closed thermoplastic composite stirrups with no damage in the bending zone, and the thermoplastic prepreg tape is wound on a winding shaft, and the movable mold is surrounded on the outside of the wound thermoplastic prepreg tape to ensure the winding effect of the thermoplastic prepreg tape, thereby ensuring the closing effect of the stirrups and improving the overall tensile performance of the stirrups. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0023] Figure 1 A schematic diagram of the structure of a production device for stirrups provided by the present invention;

[0024] Figure 2 A cross-sectional view of a production device for stirrups provided by the present invention;

[0025] Figure 3 This is a schematic structural diagram of the fixed mold provided by the present invention.

[0026] In the figure: 1. fixed mold; 101. winding shaft; 102. threaded hole; 2. movable mold; 201. connecting bolt; 3. thermoplastic prepreg tape; 4. molding notch; 5. fixing bolt. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] See also Figure 1-3 On the one hand, an embodiment of the present invention discloses a stirrup production device for processing a thermoplastic prepreg tape 3 into stirrups, comprising:

[0029] A fixed mold 1, a winding shaft 101 is provided on one side of the fixed mold 1, and a certain distance exists between the winding shaft 101 and the surrounding of the fixed mold 1;

[0030] The movable mold 2 is enclosed on the outside of the winding shaft 101 , and a winding cavity is formed between the movable mold 2 , the fixed mold 1 and the winding shaft 101 . The thermoplastic prepreg tape 3 is located in the winding cavity and is wound on the winding shaft 101 .

[0031] The thermoplastic prepreg tape 3 is wound on the winding shaft 101 , and the thermoplastic prepreg tape 3 is fixed in the winding cavity by moving the mold 2 to ensure that the thermoplastic prepreg tape 3 is tightly wound on the winding shaft 101 .

[0032] In some embodiments, a baffle is provided at one end of the winding shaft 101 away from the fixed mold 1, and a winding cavity is formed between the movable mold 2, the fixed mold 1, the winding shaft 101 and the baffle. The thermoplastic prepreg tape 3 is located in the winding cavity and is wound on the winding shaft 101.

[0033] The thermoplastic prepreg tape 3 is wound on the winding shaft 101, and the thermoplastic prepreg tape 3 is fixed in the winding cavity by the movable mold 2. The lateral movement of the thermoplastic prepreg tape 3 is limited by the baffle and the fixed mold 1 to ensure the winding effect and winding position of the thermoplastic prepreg tape 3.

[0034] In some embodiments, two fixed molds 1 are provided, and one end of the two fixed molds 1 is provided with a winding shaft 101 which is arranged opposite to each other. A threaded hole 102 is provided on the fixed mold 1, and the two fixed molds 1 are connected by a fixing bolt 5. A winding cavity is formed between the two fixed molds 1, the two winding shafts 101 and the movable mold 2. The thermoplastic prepreg tape 3 is located in the winding cavity and is wound on the two winding shafts 101.

[0035] In some embodiments, two fixed molds 1 are arranged opposite to each other and connected together by fixing bolts 5. A molding groove 4 is formed between the two fixed molds 1. The thermoplastic prepreg tape is wound on the winding shaft 101. According to different stirrup shapes, winding shafts 101 with different cross-sectional shapes are selected.

[0036] In some embodiments, the movable mold 2 is connected end to end by connecting bolts 201 to form a ring.

[0037] In some embodiments, the movable mold 2 includes a plurality of segmented molds, and the plurality of segmented molds are sequentially connected end to end via connecting bolts 201 to form a closed ring.

[0038] After the thermoplastic prepreg tape 3 is wound on the winding shaft 101, the movable mold 2 is surrounded on the outside of the thermoplastic prepreg tape 3, and the connecting bolts 201 are tightened to ensure the fastening effect of the movable mold 2 on the thermoplastic prepreg tape 3, and to ensure the fusion effect between the layers of the thermoplastic prepreg tape 3 during the production process, thereby ensuring the quality of the closed thermoplastic composite stirrups with no damage in the bending area.

[0039] On the other hand, the present invention also provides a method for producing stirrups, the production method comprising the following specific steps:

[0040] S10: clean the impurities on the fixed mold 1 and the movable mold 2, wipe them clean with anhydrous ethanol, and apply a release agent on the outer walls of the fixed mold 1 and the movable mold 2;

[0041] S20: splicing a pair of fixed molds 1 together to form a stirrup forming notch 4 in the middle;

[0042] S30: Winding the thermoplastic prepreg tape 3 on the winding shaft 101 of the fixed mold 1;

[0043] S40: Using the movable mold 2 to fasten the thermoplastic prepreg tape 3 to the fixed mold 1;

[0044] S50: placing the entire device in an oven for two hours so that the thermoplastic prepreg tape 3 is melted into a whole, and the oven temperature is between the melting temperature and the decomposition temperature of the thermoplastic resin;

[0045] S60: Take out the device, and after the temperature cools down to room temperature, remove the mold and take out the stirrups.

[0046] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0047] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A stirrup production device for processing thermoplastic prepreg tape into stirrups, characterized in that: include: A fixed mold, wherein a winding shaft is arranged on one side of the fixed mold, and a certain distance exists between the winding shaft and the surrounding of the fixed mold; A movable mold is enclosed on the outside of the winding shaft, a winding cavity is formed between the movable mold, the fixed mold and the winding shaft, and the thermoplastic prepreg tape is located in the winding cavity and is wound on the winding shaft.

2. The stirrup production device according to claim 1, characterized in that: A baffle is provided at one end of the winding shaft away from the fixed mold, a winding cavity is formed among the movable mold, the fixed mold, the winding shaft and the baffle, and the thermoplastic prepreg tape is located in the winding cavity and is wound on the winding shaft.

3. The stirrup production device according to claim 1, characterized in that: The two fixed molds are provided with two ends of the winding shaft being arranged opposite to each other, the fixed molds are provided with threaded holes, the two fixed molds are connected by fixing bolts, a winding cavity is formed between the two fixed molds, the two winding shafts and the movable mold, the thermoplastic prepreg tape is located in the winding cavity and is wound around the two winding shafts.

4. The stirrup production device according to claim 1, characterized in that: The movable mold is connected end to end by connecting bolts to form a ring body.

5. The stirrup production device according to claim 1, characterized in that: The movable mold comprises a plurality of segmented molds, and the plurality of segmented molds are sequentially connected end to end through connecting bolts to form a closed ring body.

6. A method for producing stirrups, characterized in that: The production method uses the stirrup production device according to any one of claims 1 to 5, and the production method comprises the following steps: S10: clean the impurities on the fixed mold and the movable mold, wipe them clean with anhydrous ethanol, and apply a release agent on the outer walls of the fixed mold and the movable mold; S20: splicing a pair of fixed molds together to form a stirrup forming notch in the middle; S30: Winding the thermoplastic prepreg tape on a winding shaft of a fixed mold; S40: fastening the thermoplastic prepreg tape to the fixed mold using a movable mold; S50: placing the entire device in an oven for two hours to melt the thermoplastic prepreg tape into a whole, and the oven temperature is between the melting temperature and the decomposition temperature of the thermoplastic resin; S60: taking out the device, and after the temperature cools to room temperature, removing the mold and taking out the stirrups.

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