Rail transit composite horizontal handrail and manufacturing process thereof

Abstract

This invention discloses a composite material handrail for rail transit and its manufacturing process. The composite material handrail includes a straight handrail tube and curved handrail tubes fixedly connected to both ends of the straight handrail tube. The curved handrail tubes are connected to the roof of the vehicle via connecting supports. The outermost layer of the straight handrail tube along its cross-sectional direction is a first shear layer, the innermost layer is a second shear layer, and the intermediate layers include a bending layer and a compressive balancing layer. The first and second shear layers are composed of woven fiber composite materials, the bending layer is composed of 0-degree layup fiber composite materials, and the compressive balancing layer is composed of 90-degree layup fiber composite materials. The composite material handrail for rail transit prepared by this invention can fully utilize the lightweight and weight-reduction effect. While maintaining a manufacturing cost comparable to existing metal handrails, it can reduce weight by more than 65%, demonstrating excellent weight reduction performance. Simultaneously, it meets the load-bearing requirements of rail transit handrails.

Description

Technical Field

[0001] This invention relates to the field of rail transit manufacturing technology, and in particular to a composite material handrail for rail transit and its manufacturing process. Background Technology

[0002] The information disclosed in the background section of this invention is intended only to enhance the understanding of the overall background of the invention and is not necessarily to be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art.

[0003] Lightweighting of vehicles such as high-speed trains, subways, and maglev trains can enable them to carry greater payloads, enhance the competitiveness of the railway industry, continuously increase the attractiveness of rail transport, improve energy efficiency, thereby reducing costs, and at the same time, improve the environment to some extent.

[0004] Currently, handrails in vehicles are generally made primarily of metal tubing, which suffers from drawbacks such as heavy weight, complex manufacturing processes, and low production efficiency. To reduce weight and achieve lightweight vehicle handrails, CN 116279626A (publication date: June 23, 2023) employs a stainless steel and carbon fiber composite structure, with a carbon fiber surface and a stainless steel tubing interior. This structure compensates for the insufficient overall strength of the handrail tubing, and the overall composite material is lightweight, meeting lightweight design requirements and suitable for various applications. However, it still primarily uses metal tubing, and the degree of lightweighting still needs improvement. Summary of the Invention

[0005] In view of this, the present invention provides a composite material handrail for rail transit and its manufacturing process, which can reduce the weight of the handrail by more than 60% while maintaining the same cost as the original metal structure, thus solving the problems of heavy weight, low production efficiency and complicated processes of the original metal handrail.

[0006] In a first aspect, the present invention provides a composite material horizontal handrail for rail transit, comprising a straight horizontal handrail tube and a curved horizontal handrail tube fixedly connected to both ends of the straight horizontal handrail tube; the curved horizontal handrail tube is connected to the roof of the vehicle via a connecting support.

[0007] The outermost layer of the horizontal handrail straight tube along the cross-sectional direction is the first shear layer, the innermost layer is the second shear layer, and the middle layer includes a bending layer and a compressive balancing layer; the first and second shear layers are composed of woven fiber composite materials, the bending layer is composed of 0-degree layup fiber composite materials, and the compressive balancing layer is composed of 90-degree layup fiber composite materials; the fiber composite materials of the first shear layer, the second shear layer, the bending layer, and the compressive balancing layer include fibers and resins.

[0008] Preferably, the thickness of the bending-resistant layer accounts for 50-80%, the total thickness of the first shear-resistant layer and the second shear-resistant layer accounts for 10-30%, and the thickness of the compressive balancing layer accounts for 10-20%.

[0009] Preferably, the bending-resistant layer includes a first bending-resistant layer and a second bending-resistant layer, and the compressive strength balancing layer is located between the first bending-resistant layer and the second bending-resistant layer.

[0010] Preferably, the resin in the fiber composite material of the first shear layer, the second shear layer, the bending layer, and the compressive balancing layer is selected from phenolic resin, epoxy resin, or polyurethane resin, and more preferably polyurethane resin; the fiber is selected from carbon fiber or a mixture of glass fiber and carbon fiber.

[0011] Preferably, the horizontal handrail tube further includes a heating assembly. Further, the heating assembly is a carbon fiber heating wire winding layer located between the first shear layer and the second shear layer; or, the heating assembly includes a quartz tube and a heating element placed inside the quartz tube, the heating element including a carbon fiber heating wire, a PI heating plate, and a carbon fiber electric heating film, and the heating assembly is fixed inside the horizontal handrail tube by a fixing support.

[0012] Preferably, the bending angle of the horizontal handrail bend is 90 degrees; the horizontal handrail bend is connected to the horizontal handrail straight pipe by a metal connecting block; and the horizontal handrail bend is connected to the connecting support by bolts.

[0013] Preferably, the horizontal handrail bend is a metal bend or a carbon fiber composite material bend.

[0014] Preferably, the composite material horizontal handrail also includes a plurality of spaced vertical handrail tubes, the top of which is connected to a connecting support, and the bottom of which is connected to the horizontal handrail tube via a tee; preferably, the vertical handrail tubes and the horizontal handrail tubes are made of the same material.

[0015] Secondly, the present invention provides a method for manufacturing the above-mentioned composite material handrail for rail transit, comprising the following steps:

[0016] Prepare the horizontal handrail bend and connecting support according to the design dimensions; manufacture the horizontal handrail straight tube using a continuous forming equipment; connect the connecting support, horizontal handrail bend, and horizontal handrail straight tube in sequence; fix the connecting support to the designated position on the roof of the vehicle;

[0017] The continuous forming equipment for the straight tube of the horizontal handrail includes a mold core mold, a first unidirectional yarn ring frame, an inner layer braiding machine, a unidirectional yarn separating plate, a double layer winding machine, a second unidirectional yarn ring frame, an outer layer braiding machine, a curing mold, a traction device, and a cutting device.

[0018] The forming process of the horizontal handrail straight tube is as follows: the first shear-resistant layer of woven fibers is prepared by tightly bonding the fibers to the mold core through the first unidirectional yarn ring frame and the inner layer braiding machine; then, the 0-degree layup fiber of the bending-resistant layer is prepared through the unidirectional yarn separating plate; and the 90-degree layup fiber of the compressive-balanced layer is prepared through the double-layer winding machine; subsequently, the second shear-resistant layer of woven fibers is prepared through the second unidirectional yarn ring frame and the outer layer braiding machine; after each layer of fiber yarn is pre-formed, it enters the curing mold, is mixed with resin, and is integrally cured and formed under the set temperature and pressure; after curing and forming, it is pulled, demolded, and cut to obtain the horizontal handrail straight tube.

[0019] Preferably, the curing mold is divided into three zones, which are zone one, zone two and zone three in sequence along the direction of travel of the mold core. The temperature of zone one is 70-100℃, the temperature of zone two is 110-150℃ and the temperature of zone three is 150-195℃; the preferred travel speed is 0.2-1.2m / min.

[0020] Compared with the prior art, the present invention has achieved the following beneficial effects:

[0021] (1) The rail transit composite material handrail prepared by the present invention can give full play to the lightweight and weight reduction effect. While the manufacturing cost is comparable to that of the existing metal handrail, the weight can be reduced by more than 65%, which has a good weight reduction effect. At the same time, through the design of the present invention, the composite material handrail has good mechanical properties and can meet the load-bearing requirements of rail transit handrail.

[0022] (2) The composite material handrail of the present invention adopts a segmented design, which can be mixed with multiple materials and processes to give full play to the advantages of different materials;

[0023] (3) The molding process of the horizontal handrail straight tube of the present invention can realize the longitudinal pultrusion, circumferential winding and weaving of fibers into integrated molding, and can be co-cured with resin impregnation to achieve integrated molding. The process is simple, the molding efficiency is high, and the raw material used for molding is fiber yarn, which is cheaper than composite materials such as prepreg. Attached Figure Description

[0024] The accompanying drawings, which form part of this specification, are used to provide a further understanding of the invention. The illustrative embodiments and descriptions of the invention are used to explain the invention and do not constitute an undue limitation thereof. Obviously, those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0025] Figure 1 These are the front view and top view of the composite material horizontal handrail of the present invention;

[0026] Figure 2 This is a cross-sectional view of the straight tube of the horizontal handrail of the present invention without the carbon fiber heating wire winding layer;

[0027] Figure 3 This is a cross-sectional view of the horizontal handrail straight tube containing the carbon fiber heating wire winding layer of the present invention;

[0028] Figure 4 This is a schematic diagram of a heating component according to the present invention;

[0029] Figure 5 These are the front view and BB sectional view of the horizontal handrail straight tube of the present invention;

[0030] Figure 6 yes Figure 5 A magnified view of a portion at point C;

[0031] Figure 7 yes Figure 5 AA section view;

[0032] Figure 8 yes Figure 1 BB cross-sectional view;

[0033] Figure 9 yes Figure 1 AA section view;

[0034] Figure 10 yes Figure 1 CC section view;

[0035] Figure 11 This is a diagram of the continuous forming equipment for the straight tube of the horizontal handrail of the present invention;

[0036] Figure 12 These are three views of the curing mold for the straight tube of the horizontal handrail of this invention;

[0037] In the diagram, 1. Upper mold half; 2. Lower mold half; 3. Positioning block; 4. Inner surface of outer mold; 5. Mold core mold; 6. Bolt; 7. Injection hole; 10. Fixed support; 11. Straight tube of horizontal handrail; 21. Bent tube of horizontal handrail; 31. Vertical handrail tube; 41. Connecting support; 51. T-joint; 61. Bolt hole; 71. Metal connecting block; 81. Bolt fastener; 91. Bolt; 111. First shear layer; 112. Carbon fiber heating wire winding layer; 113. First bending layer; 114. Compression balancing layer; 115. Second bending layer; 116. Second shear layer; 117. Quartz tube; 118. Heating element; 221. Reciprocating fluid. 222. Hydraulic cylinder piston rod; 223. Movable unidirectional yarn distribution frame; 224. Core mold connecting flange; 225. First unidirectional yarn ring frame; 226. Inner layer braiding machine; 227. First unidirectional yarn separating plate; 228. Double layer winding machine; 229. Second unidirectional yarn separating plate; 230. Second unidirectional yarn ring frame; 231. Outer layer braiding machine; 232. Mold table and mold heating temperature control box; 233. Operating table; 234. Hydraulic station; 235. Profile clamping gantry one; 236. Hydraulic reciprocating traction machine; 237. Profile clamping gantry two; 238. Profile cutting saw; 239. Profile finished product rack. Detailed Implementation

[0038] It should be noted that the following detailed descriptions are exemplary and intended to provide further illustration of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0039] Please refer to Figures 1-2 A composite material horizontal handrail for rail transit is provided, including a horizontal handrail straight tube 11 and a horizontal handrail curved tube 21 fixedly connected to both ends of the horizontal handrail straight tube 11; the horizontal handrail curved tube 21 is connected to the roof of the vehicle through a connecting support 41.

[0040] The outermost layer of the horizontal handrail straight tube 11 along its cross-sectional direction is a first shear layer 111, and the innermost layer is a second shear layer 116. Both the first and second shear layers 111 and 116 are composed of woven fiber composite material, which has excellent shear resistance. The woven design of the inner and outer layers effectively prevents internal cracking of the horizontal handrail straight tube 11. The intermediate layers include a bending layer and a compressive equalization layer 114. The bending layer is composed of 0-degree layup fiber composite material, which increases the resistance of the horizontal handrail straight tube 11 to external pressure and can coordinate the Poisson's ratio to adjust the deformation of the horizontal handrail straight tube 11. The compressive equalization layer 114 is composed of 90-degree layup fiber composite material, which effectively utilizes the longitudinal load-bearing capacity of the fibers. The fiber composite materials of the first shear layer 111, the second shear layer 116, the bending layer, and the compressive equalization layer 114 include fibers and resin. The horizontal handrail straight tube 11, composed of the above structure, has good load-bearing capacity and meets the load-bearing requirements of the rail transit field for horizontal handrails. When a vertical load of 900N is applied at any point on the horizontal handrail straight pipe 11 as a point load, and superimposed with a uniformly distributed load of 1300N / m, the horizontal handrail straight pipe 11 can restore its original shape without any cracking or damage.

[0041] In this invention, the thickness of the bending layer accounts for 50-80%, the total thickness of the first shear layer 111 and the second shear layer 116 accounts for 10-30%, and the thickness of the compressive balancing layer 114 accounts for 10-20%. The above thicknesses are determined based on the stress state analysis of the horizontal handrail straight pipe 11, the bending moment, the shear force, and the symmetrical and balanced ply design requirements of the composite material.

[0042] The bending-resistant layer of the present invention includes a first bending-resistant layer 113 and a second bending-resistant layer 115, and a compressive balancing layer 114 is located between the first bending-resistant layer 113 and the second bending-resistant layer 115. In the thickness direction, if the bending-resistant layers are continuously arranged for a thickness exceeding a certain limit, interlayer cracking is likely to occur. However, the above arrangement can avoid manufacturing defects and reduce the coupling deformation of the horizontal handrail straight tube 11.

[0043] This invention does not impose special restrictions on the resin used in the fiber composite material; commonly used thermosetting resins in the art can be used, such as phenolic resin, epoxy resin, and polyurethane. Preferably, this invention uses polyurethane, which has good processing performance, mechanical properties, and flame retardant properties. The polyurethane resin is a 1:1 mixture of isocyanate and polyol.

[0044] The fibers in the fiber composite material of this invention are carbon fibers or a mixture of glass fibers and carbon fibers. Carbon fibers have high mechanical properties, while glass fibers are relatively inexpensive. Mixing them can better meet cost requirements while maintaining relatively stable mechanical properties.

[0045] The horizontal handrail tube 11 of the present invention also includes a heating component, which can heat the horizontal handrail to a comfortable temperature in winter, preventing the handrail from becoming too cold and reducing the comfort of passengers holding the handrail tube. The heating component has two optional forms:

[0046] In one configuration, a carbon fiber heating wire winding layer 112 is provided between the first shear layer 111 and the second shear layer 116, such as... Figure 3 As shown. The position of the carbon fiber heating wire winding layer 112 relative to the first bending-resistant layer 113, the second bending-resistant layer 115, and the compressive strength balancing layer 114 can be adjusted according to actual conditions. In one embodiment of the present invention, the carbon fiber heating wire winding layer 112 is located between the first shear-resistant layer 111 and the first bending-resistant layer 113. The carbon fiber heating wire winding layer 112 generates heat through the resistance of carbon fibers by connecting a low voltage and low current circuit.

[0047] Another type of heating assembly includes a quartz tube 117 and a heating element 118 disposed inside the quartz tube 117, such as Figure 4 As shown, one end of the quartz tube 117 is closed, and the other end is press-sealed. The heating element 118 is connected to an external power source via a wire. The heating element 118 includes a carbon fiber heating wire, a PI heating plate, and a carbon fiber heating film. The heating assembly is fixed inside the horizontal handrail straight tube 11 by several spaced fixing supports 10. Figure 5 As shown, the fixed support 10 and the horizontal handrail straight tube 11 are connected by an interference fit. The fixed support 10 is made of heat-resistant elastic material and serves to fix the heating component. An enlarged view of the fixed support 10 is shown below. Figure 6 , Figure 7 As shown.

[0048] The bending angle of the horizontal handrail bend 21 of the present invention is 90 degrees. The horizontal handrail bend 21 and the horizontal handrail straight tube 11 are connected by a metal connecting block 71. The structure of the metal connecting block 71 is as follows: Figure 8 As shown, the connection is reinforced by bolt fasteners 81. The horizontal handrail bend 21 of the present invention is a metal bend or a carbon fiber composite material bend. Using metal has the advantage of low cost, while using carbon fiber composite material can give full play to the design flexibility of composite materials. Local reinforcement design can be carried out according to the load conditions of the horizontal handrail bend 21, which solves the problem of the uniformity of metal handrail bend material and the characteristic that it can only bear force evenly, and avoids stress concentration in the bending area.

[0049] The horizontal handrail bend 21 and the connecting support 41 of the present invention are connected by bolts 91. The horizontal handrail bend 21 is provided with bolt holes 61, such as... Figure 1 and Figure 9As shown. When the horizontal handrail bend 21 is made of carbon fiber composite material, after the bottom of the connecting support 41 is inserted into the horizontal handrail bend 21, it is first glued and then bolted to ensure the reliability of the connection.

[0050] The composite material horizontal handrail of the present invention also includes a plurality of spaced-apart vertical handrail tubes 31. The top of each vertical handrail tube 31 is connected to a connecting support 41, and the bottom of each vertical handrail tube 31 is connected to a horizontal handrail straight tube 11 via a tee 51. Figure 10 As shown. The material of the vertical handrail tube 31 is preferably the same as that of the horizontal handrail tube 11.

[0051] The outer diameter of the horizontal handrail straight tube 11 and the horizontal handrail bent tube 21 of the present invention is 30-38mm, and the wall thickness is 4-6mm.

[0052] In another embodiment of the present invention, a method for manufacturing the above-mentioned composite material handrail for rail transit is provided, comprising the following steps:

[0053] Prepare the horizontal handrail bend 21 and connecting support 41 with the designed dimensions; manufacture the horizontal handrail straight tube 11 using a continuous forming equipment; connect the connecting support 41, the horizontal handrail bend 21, and the horizontal handrail straight tube 11 in sequence; fix the connecting support 41 to the set position on the roof of the vehicle.

[0054] The continuous forming equipment for the horizontal handrail straight tube 11 is as follows: Figure 11 As shown, it includes a mold core mold 5, a first unidirectional yarn looper 225, an inner layer braiding machine 226, a first unidirectional yarn separating plate 227, a double layer winding machine 228, a second unidirectional yarn looper 230, an outer layer braiding machine 231, a curing mold 240, a traction device, and a cutting device.

[0055] The forming process of the horizontal handrail straight tube 11 is as follows: First, the fibers of the first shear layer 111 are prepared by tightly bonding the fibers to the mold core 5 using a first unidirectional yarn looper 225 and an inner layer braiding machine 226. Then, 0-degree layup fibers of the bending layer are prepared using a first unidirectional yarn separating plate 227, and 90-degree layup fibers of the compression balancing layer 114 are prepared using a double-layer winding machine 228. Subsequently, the fibers of the second shear layer 116 are prepared using a second unidirectional yarn looper 230 and an outer layer braiding machine 231. After pre-forming each layer of fiber yarn, it enters the curing mold 240, mixes with resin, and is integrally cured under a set temperature and pressure. After curing, it is pulled, demolded, and cut to obtain the horizontal handrail straight tube 11. This invention, based on the layup design of the horizontal handrail straight tube 11, has invented the above-mentioned forming equipment and forming process, which can realize the continuous production of the horizontal handrail straight tube 11 at low cost and automation.

[0056] In a specific embodiment of the present invention, the continuous forming equipment for the horizontal handrail straight tube 11 includes, in sequence, a reciprocating hydraulic cylinder 221, a piston rod 222 of the hydraulic cylinder, a core mold connecting flange 224, a mold core mold 5, a first unidirectional yarn ring frame 225, an inner layer braiding machine 226, a movable unidirectional distribution yarn frame 223, a first unidirectional yarn separating plate 227, a double layer winding machine 228, a second unidirectional yarn separating plate 229, a second unidirectional yarn ring frame 230, an outer layer braiding machine 231, a mold table and a mold heating temperature control box 232, a curing mold 240, an operating table 233, a hydraulic station 234, a profile clamping gantry 1 235, a hydraulic reciprocating traction machine 236, a profile clamping gantry 237, a profile cutting saw 238, and a profile finished product rack 239. The reciprocating hydraulic cylinder 221 and its piston rod 222 are connected to the mold core mold 5 via the core mold connecting flange 224. The mold core mold 5 is adjusted to facilitate the entry of fiber yarn into the molding mold and to facilitate demolding. The unidirectional yarn separating plate can separate large tow carbon fibers such as 48K and 50K into smaller tow fibers, which is beneficial for resin impregnation.

[0057] After each layer of fiber yarn is pre-formed, it enters the curing mold 240, mixes with resin, and is cured and formed in one piece under a certain temperature and pressure. After curing, it is pulled by the hydraulic reciprocating traction machine 236 through the profile clamping gantry 237, and finally cut by the profile cutting saw 238 and placed on the profile finished product rack 239.

[0058] When the heating component is a carbon fiber heating wire winding layer 112, the carbon fiber heating wire winding layer 112 is formed by winding fibers at 90 degrees through a double-layer winding machine 228. The positions of the double-layer winding machine, the unidirectional yarn separating plate 227, and the second unidirectional yarn separating plate 229 can be varied according to the positions of the carbon fiber heating wire winding layer 112, the compressive strength balancing layer 114, and the bending resistance layer.

[0059] In this invention, the specific structure of the curing mold 240 is as follows: Figure 12 As shown, the upper mold 1, lower mold 2, and positioning block 3 are connected by bolts 6. The inner surface 4 of the outer mold formed by the upper mold 1 and lower mold 2 is fitted with the mold core mold 5 to manufacture a carbon fiber composite tube. The curing mold 240 is also provided with a glue injection hole 7, which is used to inject resin for curing.

[0060] The curing mold 240 of the present invention is provided with three zones, which are zone one, zone two and zone three in sequence along the traveling direction of the mold core mold 5. The temperature of zone one is 70-100℃, the temperature of zone two is 110-150℃, and the temperature of zone three is 150-195℃. The traveling speed of the mold core mold 5 is preferably 0.2-1.2m / min.

[0061] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method of manufacturing a rail transit composite cross handrail, characterized in that, The rail transit composite material horizontal handrail includes a straight horizontal handrail tube and a curved horizontal handrail tube fixedly connected to both ends of the straight horizontal handrail tube; the curved horizontal handrail tube is connected to the roof of the vehicle through a connecting support. The outermost layer of the horizontal handrail straight tube along the cross-sectional direction is the first shear layer, the innermost layer is the second shear layer, and the middle layer includes a bending layer and a compressive balancing layer; the first and second shear layers are composed of woven fiber composite materials, the bending layer is composed of 0-degree layup fiber composite materials, and the compressive balancing layer is composed of 90-degree layup fiber composite materials; the fiber composite materials of the first shear layer, second shear layer, bending layer, and compressive balancing layer include fibers and resin; The manufacturing method of the composite material handrail for rail transit includes the following steps: Prepare the horizontal handrail bend and connecting support according to the design dimensions; manufacture the horizontal handrail straight tube using a continuous forming equipment; connect the connecting support, horizontal handrail bend, and horizontal handrail straight tube in sequence; fix the connecting support to the designated position on the roof of the vehicle; The continuous forming equipment for the horizontal handrail straight tube includes a mold core mold, a first unidirectional yarn ring frame, an inner layer braiding machine, a unidirectional yarn separating plate, a double layer winding machine, a second unidirectional yarn ring frame, an outer layer braiding machine, a curing mold, a traction device, and a cutting device. The forming process of the horizontal handrail straight tube is as follows: the first shear-resistant layer of woven fibers is prepared by tightly bonding the fibers to the mold core through the first unidirectional yarn ring frame and the inner layer braiding machine; then, the 0-degree layup fiber of the bending-resistant layer is prepared through the unidirectional yarn separating plate; and the 90-degree layup fiber of the compressive-balanced layer is prepared through the double-layer winding machine; subsequently, the second shear-resistant layer of woven fibers is prepared through the second unidirectional yarn ring frame and the outer layer braiding machine; after each layer of fiber yarn is pre-formed, it enters the curing mold, is mixed with resin, and is integrally cured and formed under the set temperature and pressure; after curing and forming, it is pulled, demolded, and cut to obtain the horizontal handrail straight tube.

2. The method of manufacturing a rail transit composite horizontal handrail according to claim 1, wherein, The thickness of the bending-resistant layer accounts for 50-80%, the total thickness of the first shear layer and the second shear layer accounts for 10-30%, and the thickness of the compressive balancing layer accounts for 10-20%.

3. The method of manufacturing a rail transit composite horizontal handrail according to claim 1, wherein, The bending-resistant layer includes a first bending-resistant layer and a second bending-resistant layer, and the compressive strength balancing layer is located between the first bending-resistant layer and the second bending-resistant layer.

4. The method of manufacturing a rail transit composite horizontal handrail according to claim 1, wherein, The resin in the fiber composite material of the first shear layer, the second shear layer, the bending layer, and the compressive balancing layer is selected from epoxy resin or polyurethane resin, and the fiber is selected from carbon fiber or a mixture of glass fiber and carbon fiber.

5. The method of manufacturing a rail transit composite horizontal handrail according to claim 1, wherein, The horizontal handrail tube also includes a heating assembly; the heating assembly is a carbon fiber heating wire winding layer located between the first shear layer and the second shear layer; or, the heating assembly includes a quartz tube and a heating element placed inside the quartz tube, the heating element including a carbon fiber heating wire, a PI heating plate or a carbon fiber electric heating film, and the heating assembly is fixed inside the horizontal handrail tube by a fixed support.

6. The method of manufacturing a rail transit composite horizontal handrail according to claim 1, wherein, The bending angle of the horizontal handrail bend is 90 degrees; the horizontal handrail bend is connected to the horizontal handrail straight pipe by a metal connecting block; the horizontal handrail bend is connected to the connecting support by bolts.

7. The method of manufacturing a rail transit composite horizontal handrail according to claim 1, wherein, The horizontal handrail bend is a metal bend or a carbon fiber composite material bend.

8. The method of manufacturing a rail transit composite horizontal handrail as claimed in claim 1, wherein, include: The composite material horizontal handrail also includes multiple spaced vertical handrail tubes. The top of the vertical handrail tubes is connected to a connecting support, and the bottom of the vertical handrail tubes is connected to the horizontal handrail tubes via a tee. The vertical handrail tubes and the horizontal handrail tubes are made of the same material.

9. The method of manufacturing a rail transit composite horizontal handrail as claimed in claim 1, wherein, The curing mold is divided into three zones, which are zone one, zone two and zone three in sequence along the direction of mold core travel. The temperature of zone one is 70-100℃, the temperature of zone two is 110-150℃, and the temperature of zone three is 150-195℃. The mold core travel speed is 0.2-1.2m / min.

Images