Plastic tube welding protection opening

Abstract

The invention discloses a plastic tube welding protection opening. The plastic tube welding protection opening is of a structure which is integrally formed by a tubular lining ring and a horn-shaped cornice. The tube wall of the tubular lining ring is very thin, and the outer diameter of the tube wall of the tubular lining ring is equal to the inner diameter of a round limiting ridge or slightly smaller than the inner diameter of a plastic tube inserting opening. The outer diameter of the horn-shaped cornice is slightly smaller than the outer diameter of the plastic tube inserting opening. According to the plastic tube welding protection opening, before construction, the plastic tube welding protection opening is embedded into the plastic tube inserting opening to be welded and tightly attached to the inner wall and the opening edge of the plastic tube inserting opening, the the outer wall of the plastic tube inserting opening is subjected to hot melting, the inner wall of the plastic tube inserting opening is slightly softened and then inserted into a tube fitting bell mouth which is obtained after hot melting, and welding is completed. When a hot melting device is drawn away, molten materials can be protected against losses and retention, the plastic tube inserting opening can also be prevented from deforming and silting and reducing towards the interior of a tube in the inserting connecting process, the closed molten materials can bear extrusion and are matched for correcting skew and eliminating gaps, and the purposes of meshing of concave and convex staggered faces and dense melting and combining are achieved. According to the plastic tube welding protection opening, operation errors which are hard to avoid can be positively utilized, and the welding effect is improved; the operation error range can be reasonably widened, and work efficiency is improved; and a primary-standard-wall-thickness tube can be used for replacing a super-standard-wall-thickness tube, the cost is reduced, and water flow is increased.

Description

technical field [0001] The invention relates to building water supply engineering fittings, in particular to a plastic pipe welding port guard. Background technique [0002] The connection methods of plastic pipes and pipe fittings in existing building water supply projects are hot-melt sockets and cone-plane welding. The fuser used in the project is equipped with a melting head and a melting sleeve on the left and right coaxial lines. The depth, push-out taper and surface area of ​​the melting head, melting sleeve, and pipe fitting socket are all equal and symmetrical, and the socket of the plastic pipe can be squeezed into The outer wall of the melting sleeve is melted, and the socket of the pipe fitting can also be squeezed into the melting head to melt the inner wall at the same time. When working, draw a positioning line on the socket of the plastic pipe according to the depth of the socket of the pipe fitting and squeeze it into the fuser coaxially with the socket of ...

AI Technical Summary

Problems solved by technology

[0003] 1. After the plastic pipe socket and the pipe fitting socket are melted and pulled away from the fuser, a little molten material will adhere more or less, which not only causes the loss of the outer wall of the plastic pipe socket and the inner wall of the pipe fitting socket, but also causes residues after thermal decomposition Pollution of the pipe wall for secondary heating will directly affect the next bonding effect

[0004] 2. After the plastic pipe socket and the pipe fitting socket are melted and pulled out from the fuser, they cannot be pulled out precisely on the same axis, which will easily cause the two melting surfaces to more or less peel off the molten material and cause secondary damage; similarly, the plastic pipe socket In the process of plugging and advancing with the pipe fitting socket, it was damaged three times, making the two bonding surfaces uneven, resulting in welding gaps, which will loosen and leak after long-term use

[0005] 3. When using positive-standard wall thickness pipes for construction, if the hot-melt temperature is slightly lower, the condensation will be very fast, and it must be inserted quickly. When the insertion is found to be skewed, the correction time is very short, and the skewed insertion will not only cause the pipeline to malfunction. position, and the two cones do not fit together, resulting in gaps, and it is more difficult to rework after the pressure test

[0006] 4. When using the normal standard wall thickness pipe for construction, if the heat melting temperature is slightly higher, the inner wall of the plastic pipe socket will soften, causing wrinkles before the insertion can not reach the circular limit ridge, or continue to push the extruded pipe fitting socket The front end exceeds the positioning line of the socket of the plastic pipe, and the two cause the symmetrical bonding surface to shrink and the water flow to the shrinkage is not smooth, and the pressure of the wrinkle release cannot be achieved.

[0007] 5. The pipe with wall thickness exceeding the standard is used for construction, the hot-melt temperature is slightly higher, and the inner wall of the plastic pipe socket is not easy to soften, but it must be controlled precisely by skilled experience, and the insertion cannot be skewed. The plastic pipe socket and the two taper surfaces of the pipe socket are matched under the state of the pipe fitting, and the seamless bonding is very high for the operator, and it is difficult to fully guarantee the project quality.

Furthermore, the construction of pipes with excessive wall thickness not only increases the cost of materials, but also reduces the inner diameter of the pipes, resulting in a decrease in water flow

[0008] 6. When mechanical tooling is used for welding construction, although the socket of the plastic pipe and the socket of the pipe fitting can be precisely pulled out of the fuser on the same axis and realize the two cones matching head-to-head extrusion bonding, but the extrusion must have a push-out taper to achieve , and with a taper, the torque will be greater than zero. If the pipe is a little long and buried and fixed, there will be a hidden danger of loosening and water seepage when the weld is too stressed when it encounters heat expansion and cold contraction, and mechanical tool welding can only solve the problem of assembly , the overall assembly and secondary modification or maintenance cannot be used, and must be completed manually by Denggao

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