Is the handrail on the bus made of iron pipe or stainless steel decorative pipe?

In the prior art, bus handrails are mainly made of iron pipes, stainless steel pipes and aluminum alloy pipes, and their production features are that manufacturers bend the iron pipes, stainless steel pipes and aluminum alloy pipes into handrails with a pipe bender according to the requirements of the handrails drawings of the main engine plant, and then spray paint or plastic to meet the requirements of the main engine plant on the appearance and color of handrails. However, in the production process, handrails need to be bent with a pipe bender. Because the metal tube will recover to a certain extent after bending, it is generally necessary to bend the handrail of the metal tube more than twice to achieve the expected effect.

Technical realization elements:

The utility model aims to provide a composite bus handrail pipe, which is made of nonmetallic composite materials and adopts a special connection structure, which can realize automatic production and has high production efficiency.

In order to solve the above technical problems, the utility model adopts the following technical scheme:

A composite bus handrail tube consists of an inner tube and an outer tube, and two adjacent outer tubes are connected through the inner tube; The inner pipe sleeve is arranged in the outer pipe, the outer wall of the inner pipe is provided with limit strips uniformly distributed in the radial direction, the inner wall of the outer pipe is provided with limit grooves, and the structure of the limit grooves is adapted to that of the limit strips, and the limit strips are located in the limit grooves; The section of the limiting strip is fan-shaped, and one end with smaller width is connected with the inner tube; The number of limit grooves is twice that of limit strips, so half of the limit grooves are empty, which can further reduce the weight of the handrail pipe and have stronger bending resistance. After the two outer tubes are connected through the above structure, in order to improve the strength of the connection, they can be further fixed by gluing.

The outer tube of the composite bus handrail tube sequentially comprises a polyester protective layer, a reinforcing layer, a matrix layer, an alkali-free roving layer, a flame retardant layer and a polyester inner protective layer from inside to outside, and the polyester protective layer is provided with a limiting groove. Polyester for polyester protective layer: unsaturated polyester resin, liquid. It is the main raw material for producing pipe fittings in this patent. In the production process, when the resin infiltrates glass fiber (alkali-free felt, composite felt, untwisted roving, etc.). ), curing at high temperature in a mold to prepare a high-strength solid pipe. Strengthening layer: the composite material of polyester resin and glass fiber after curing, and the strength and physical and chemical properties of the pipe depend on it. Matrix layer: the matrix layer is the resin layer, which belongs to the manufacturing technical term; When polyester resin infiltrates glass fiber, it produces a layer of bonding interface, which not only enhances the strength of glass fiber, but also plays a role in protecting products. Inner and outer polyester protective layer: smooth polystyrene monomer layer produced on the surface of pipe wall during curing, also called protective layer.

When molding and batching, the release agent, pigment and flame retardant filler, such as aluminum hydroxide powder and polyamide flame retardant, are added into the polyester protective layer according to the formula ratio, so as to achieve the purpose of smoke-free flame retardant of the whole tube, and at the same time, it will never fade, reduce the spraying cost and reduce the problems of fading, fading and poor color adhesion. The outer tube is molded by thermoplastic, and a small amount of filler, curing agent and organic pigment can be added between the polyester protective layer and the polyester protective layer on the inner surface during the molding process. Organic color can permeate into each layer of the outer tube, so that the coloring of the handrail tube can be completed in the production process, and the surface of the handrail tube does not need to be re-colored, thereby reducing the working procedures, reducing the labor cost and improving the fire resistance of the handrail tube. The flame retardant layer is an additive composite material, and its main components are solid powder, such as aluminum hydroxide powder and polyamide flame retardant. The solid powder is added to the flame retardant fabric. By setting the flame retardant layer, the flame retardant performance of the handrail pipe can be enhanced and the fire can be prevented from spreading further.

Function of composite felt: Sandwich composite felt is made of synthetic non-woven fabric core material, fiber chopped layers on the front and back or single side (without adhesive), or fiber cloth and multi-axial fabric by sewing. Glass fiber composite felt is made of glass fiber rovings arranged in parallel along one direction, and the outermost composite chopped glass fiber yarn or chopped felt is stitched with organic fiber. Its main function is that the fiber structure is multi-directional, which not only ensures the strength of the object, but also has the wettability and fluidity of the matrix resin and can provide high strength in a certain direction; The fiber is not easy to generate displacement and deformation, and easy to operate; The fabric does not contain any adhesive and is easy to soak; The complexity of the structure can reduce stratification and effectively improve production efficiency.