CN114193775A

CN114193775A - Welding machine for eliminating inner fused ring of hot-melt welding plastic pipe

Info

Publication number: CN114193775A
Application number: CN202111398734.6A
Authority: CN
Inventors: 李兵辉
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-11-24
Filing date: 2021-11-24
Publication date: 2022-03-18

Abstract

The invention belongs to the technical field of pipeline engineering, and particularly relates to a welding machine for eliminating an inner fused ring of a hot-melt welding plastic pipe, which comprises a base, a heating rod, an extrusion component, a plugging component and a vacuum component, wherein the heating rod is arranged on the base; according to the invention, negative pressure is formed outside the pipeline joint through the vacuum component, then the pipeline is sealed through the plugging component and gas is injected into the pipeline, so that positive pressure is formed inside the pipeline, further, pressure difference is formed inside and outside the pipeline at the pipeline joint, the pipe wall is subjected to outward radial force at the joint, then, the pipeline joint is heated and melted, further, under the action of the inside and outside pressure difference of the pipeline, extrusion force is axially applied to the pipeline through the pressurizing component, so that the pipe wall can keep a pressurized state, and the molten part of the pipeline is turned outwards due to the outward radial force; and then the pipeline wall after melting does not enter the pipeline, so that the diameter of the pipeline joint cannot be reduced, and the conveying capacity after pipeline connection is ensured.

Description

Welding machine for eliminating inner fused ring of hot-melt welding plastic pipe

Technical Field

The invention belongs to the technical field of pipeline engineering, and particularly relates to a welding machine for eliminating an inner fused ring of a hot-melt welding plastic pipe.

Background

The building pipeline is connected according to the application and the pipe material by the following common connecting methods: threaded connection, flange connection, welding, groove connection (clamp connection), ferrule connection, clamping connection, hot melt connection and the like; the threaded connection is realized by using a pipeline fitting with threads, and galvanized steel pipes with the pipe diameter less than or equal to 100mm are preferably connected by the threads and are mostly used for open installation of pipelines; the flange connection is that two pipelines, pipe fittings or equipment are respectively fixed on a flange plate, then a flange pad is added between the two flange plates, and finally the two flange plates are tightened by bolts to be tightly combined; the welding is suitable for non-galvanized steel pipes, is mainly used for concealed pipelines and pipelines with larger diameters, and is more applied to high-rise buildings. The copper pipe connection can adopt a special joint or welding, and socket joint or sleeve pipe welding is adopted when the pipe diameter is less than 22 mm; the pipe is pressed tightly on the pipe by a locking nut and a screw thread pipe. Sleeving the fitting nut on the end of the pipeline, sleeving the inner core of the fitting into the end, and tightly tightening the fitting and the nut by using a wrench; the hot-melt connection is widely applied to connection of novel pipes such as PP-R pipes, PB pipes, PE-RT pipes and the like and pipe fittings.

In the laying process of the municipal pipe network, the length limitation of a single pipeline is limited, so the pipeline connection is necessary, the hot melting welding is carried out by a hot melting welding machine in the plastic pipeline connection, the end part of the pipeline is melted firstly in the hot melting welding process, then pressure is applied in the axial direction of the pipeline, so the end part of the pipeline after the hot melting is bonded, and the plastic pipeline connection is completed, but the rigidity of the plastic pipeline is poor after the plastic pipeline is melted, the periphery of the plastic pipeline can be diffused and deformed after the extrusion force is applied, the cross section of the pipeline is circular, and part of the melted pipe wall is diffused into the pipeline along with the diffusion of the melted pipe wall, so the inner wall of the pipeline is protruded at the connection part, the inner diameter of the pipeline is smaller, and the water passing area of the pipeline is reduced, thereby reducing the delivery efficiency of the pipeline.

Disclosure of Invention

In order to make up for the defects of the prior art, the invention provides a welding machine for eliminating an inner melting ring in the process of thermally melting and welding plastic pipes. The invention is mainly used for solving the problem that when the traditional hot melting welding is carried out, the molten material enters the pipeline to form an inner melting ring, so that the inner diameter of the pipeline is reduced, and the conveying efficiency is reduced.

The technical scheme adopted by the invention for solving the technical problems is as follows: a welding machine for eliminating an inner fused ring of a hot-melt welding plastic pipe comprises a base, a heating rod, an extrusion component, a plugging component and a vacuum component; the vacuum component is arranged on the upper part of the base and used for clamping the pipeline connecting part and providing a vacuum environment outside the pipeline welding part; the heating rod is arranged on one side of the vacuum component; the heating rod is connected with the vacuum component; the heating rod is positioned on the outer side of the pipeline welding position; the two sides of the vacuum part are symmetrically provided with extrusion parts; the extrusion component is used for applying axial extrusion force to the welded pipeline; the welding machine is provided with at least two plugging components which are used for plugging two ports of the welded pipeline; the plugging component is communicated with an external positive pressure gas source.

During operation, during the laying process of the municipal pipe network, the length of a single pipe is limited, so that the pipes must be connected, during the connection of the plastic pipes, hot-melt welding is performed through a hot-melt welding machine, during the hot-melt welding process, the end parts of the pipes are melted first, then pressure is applied in the axial direction of the pipes, so that the end parts of the pipes after hot melting are bonded, and the connection of the plastic pipes is completed, but after the plastic pipes are melted, the rigidity of the plastic pipes is poor, so that the periphery of the plastic pipes can be diffused and deformed after extrusion force is applied, as the cross sections of the pipes are circular, and as the pipe walls after melting are diffused, part of the melted pipe walls are diffused into the pipes, and then the inner walls of the pipes are protruded at the connecting parts (such as shown in fig. 9), so that the inner diameters of the pipes are small, so that the water passing area of the pipeline is reduced, and the conveying efficiency of the pipeline is reduced; therefore, in the scheme, when the plastic pipeline is welded, the end parts of the pipelines at two ends are butted and then placed in the vacuum component, through the work of the vacuum component, negative pressure is formed outside the pipeline joint, meanwhile, the inside of the pipeline forms a closed space, then, through an external positive pressure gas source, gas is introduced into the pipeline, so that positive pressure is formed inside the pipeline, pressure difference is formed inside and outside the pipeline at the pipeline joint, further, the pipeline has the tendency of outward expansion at the joint, then, through the heating rod, the pipeline joint is heated and melted, further, the plasticity of the side wall of the pipeline is increased, further, under the action of the pressure difference inside and outside the pipeline, the pipe wall is subjected to outward radial force in the joint, and in the process, through the arranged extrusion component, the pipelines at two ends are extruded to the joint along the axial direction, so that the pipelines are subjected to extrusion force in the axial direction, the pipe wall at the joint can keep a continuous pressurization state, and the fused part of the pipeline is continuously turned outwards due to the existence of radial force in the outward direction; and then make the pipeline wall after the melting not enter into inside the pipeline (for example as shown in fig. 10), and then make the diameter of pipeline junction can not reduce, make the pipeline cross the water area at the junction can not reduce simultaneously, and then guaranteed the conveying ability behind the pipe connection, and then improved the quality of pipe connection.

Preferably, the vacuum component comprises a fixed clamping shell, a movable clamping shell, a stabilizing sheet, a fused ring fixing ring, a vacuum pump and a sealing ring; a fixed clamping shell is arranged at the upper part of the base; the fixed clamping shell is fixedly connected with the base; the movable clamping shell is arranged at the upper part of the fixed clamping shell; the fixed clamping shell is rotationally connected with one side surface of the movable clamping shell through a pin shaft; the other side surfaces of the fixed clamping shell and the movable clamping shell are provided with buckles; the inner parts of the fixed clamping shell and the movable clamping shell are symmetrically provided with the fused ring fixing rings; the fused ring fixed ring is of a semi-cylindrical structure; the two ends of the fused ring fixing ring are symmetrically provided with the stabilizing pieces; one end of the stabilizing sheet is fixedly connected with the fused ring shaping ring; the stabilizing sheet is of a semi-cylindrical structure; the side surface of the stabilizing sheet close to the fixing clamp shell is fixedly connected with the fixing clamp shell; the side surface of the stabilizing sheet close to the movable clamping shell is fixedly connected with the movable clamping shell; the inner side of the stabilizing sheet is provided with a groove; the sealing ring is arranged in the groove; the sealing ring is clamped with the groove; the vacuum pump is arranged at the upper part of the base; the vacuum pump is fixedly connected with the base; the inner side of the movable clamping shell is communicated with the vacuum pump through a hose; the heating rods are symmetrically arranged on one side surface of the fixed clamping shell and one side surface of the movable clamping shell; the heating rod is respectively and fixedly connected with the fixed clamping shell and the movable clamping shell; through holes are symmetrically formed in the two ends of the fused ring fixing ring at even intervals.

When the vacuum pipeline sealing device works, the buckle between the movable clamping shell and the fixed clamping shell is opened, the movable clamping shell is rotated afterwards, the upper part of the fixed clamping shell is not shielded, so that the pipeline is conveniently placed in the vacuum component, the end parts of the pipelines at two ends are butted and then placed on the fixed clamping shell, the joint of the two pipelines is positioned at the middle position of the fused ring shaping ring through movement, the movable clamping shell is rotated afterwards, the buckle is fastened, the movable clamping shell and the fixed clamping shell form a finished tubular structure, further, a sealed space is formed in the movable clamping shell and the fixed clamping shell, then, a negative pressure area is formed in the movable clamping shell and the fixed clamping shell through the work of the vacuum pump, a sealed area is formed along with the fixed clamping shell and the fixed clamping shell, and further, the stabilizing piece and the fused ring shaping ring in the movable clamping shell, the stabilizing piece and the fused ring shaping ring in the fixed clamping shell form a sealed tubular structure, the connecting pipe is placed inside the stabilizing piece, the sealing ring is arranged on the inner side of the stabilizing piece, and through holes are symmetrically formed in the two ends of the fused ring fixing ring at uniform intervals, so that a negative pressure area is formed between the fused ring fixing ring and the pipeline, pressure difference is generated between the inside and the outside of the joint of the pipeline, and radial force in an outward direction is generated, so that the fused pipe wall moves outwards in the hot melting connection process, the fused pipe wall is prevented from reducing the inner diameter of the pipeline, and the transportation performance of the hot melting connection groove pipeline is ensured; meanwhile, the fused ring shaping ring is arranged outside the pipeline, so that the outward diffused fused pipe wall is limited, the fused ring with a regular shape is finally formed, the outward diffused fused pipe wall is prevented from dropping due to gravity, the fused ring formed at the hot-melt joint is prevented from generating defects in the circumferential direction, and the connection strength of the hot-melt joint is further reduced, so that the quality of the hot-melt welding fused ring is improved through the arranged fused ring shaping ring, and the quality of the hot-melt welding is further improved; meanwhile, in the process of carrying out hot-melt welding, due to heat transfer, the length of hot melt is not limited to a connecting part, and the hot melt can often radiate to a certain range of a pipeline, and in the scheme, gas with positive pressure is arranged inside the pipeline, so that the pipe wall is subjected to outward force, the pipe wall is expanded outwards, and further the pipe section of the pipeline, which is influenced by the heat of the hot-melt welding, is deformed; simultaneously because the through-hole that sets up is the symmetry setting, and then can insert strengthening rib (steel wire, nylon rope, rope made of hemp etc.) as required in the through-hole, and then at pipeline welded in-process, the pipeline lateral wall after the melting enters into the inside back of fused ring design circle, bonds with the strengthening rib, and then makes the strengthening rib gomphosis inside the fused ring, and then has increased the pipeline at axial joint strength, and then has improved pipeline welded quality.

Preferably, the extrusion part comprises a movable frame, a slide rail, a slide block, an upper clamping ring, a lower clamping ring, a fastening bolt and a hydraulic cylinder; the sliding rails are symmetrically arranged on the upper part of the base; the sliding rail is fixedly connected with the base; the upper part of the sliding rail is connected with a sliding block in a sliding manner; the movable frame is arranged at the upper part of the sliding block; the movable frame is fixedly connected with the sliding block; the upper part of the movable frame is provided with the lower clamping ring; the lower clamping ring is fixedly connected with the movable frame; the upper clamping ring is arranged at the upper part of the lower clamping ring; the lower clamping ring is rotatably connected with one side of the upper clamping ring through a pin shaft; the other side of the lower clamping ring is provided with a threaded hole; fastening bolts are symmetrically arranged on the other side of the upper clamping ring; the fastening bolt is rotationally connected with the upper clamping ring; the hydraulic cylinder is arranged at the upper part of the base; the hydraulic cylinder is fixedly connected with the base; and one end of a movable rod of the hydraulic cylinder is fixedly connected with the movable frame.

When the pipeline fusion welding device works, external force needs to be applied to enable the pipelines at the two ends to be close to each other in the fusion welding process of the pipelines, so that the fused pipe walls between the pipelines can be bonded together, the applied pressure needs to be accurately controlled, if the applied pressure is increased, the pipeline fusion ring is too large, and if the applied pressure is smaller, the welding between the pipelines at the two ends is not tight enough; therefore, in the scheme, when welding is carried out, the fastening bolt is loosened, then the upper clamping ring is rotated to enable the upper clamping ring to be separated from the upper part of the lower clamping ring, then the pipeline is placed in the lower clamping ring, the upper clamping ring is pressed towards the lower clamping ring by rotating the upper clamping ring, the fastening bolt is locked, then the upper clamping ring and the lower clamping ring clamp the pipeline, when axial pressure needs to be exerted, the hydraulic cylinder is controlled to move, the movable frame is further driven to move along the square of the sliding rail, the pipelines are further driven to mutually pressurize, axial pressure is further generated, further the fused pipelines can be mutually extruded, further the adhesion between the fused pipelines is increased, and further the pipeline welding is firmer; because the part of the power provided is the hydraulic cylinder, the mutual extrusion force among the pipelines can be controlled by controlling the oil pressure in the hydraulic cylinder, and because the pressure output by the pressure cylinder is relatively stable and has no vibration, the welding position can not be vibrated in the pipeline welding process, and the welding quality is improved; secondly because the welding machine has certain height, consequently at the welding process who carries out the pipeline, under the effect of gravity, can make the butt joint position of pipeline appear slight deflection, and then can lead to the tip of pipeline can not laminate completely (for example shown in fig. 11), and then lead to the fact revealing of internal pressure, and then cause the pipeline welding to be difficult to go on or cause the welding department to receive radial bending force, and then cause welded quality to reduce, consequently through last snap ring and the lower snap ring that sets up, and then embrace the pipeline completely and clip, and then make the pipeline at two pressurized component middle parts keep the level, and do not receive radial bending force, and then make the terminal surface of two pipelines can laminate completely, and then improved welded quality.

Preferably, the axial length of the lower clamping ring and the axial length of the upper clamping ring are not less than five times of the diameter of the welded pipeline; the length of the stabilizing piece is not less than ten times of the diameter of the welded pipeline.

In the working process, as the welding machine has a certain height, in the process of welding the pipeline, under the action of gravity, the butt joint position of the pipeline slightly deflects, so that the end parts of the pipeline cannot be completely attached (for example, as shown in fig. 11), further internal pressure leakage is caused, further pipeline welding is difficult to carry out or the welding part is subjected to radial bending force, further the welding quality is reduced, meanwhile, in the process of welding the plastic pipeline, the dead weights of the pipelines with different diameters and unit lengths of the pipelines with different diameters are inconsistent, the plastic pipelines can be bent differently, the bending degree of the pipeline is related to the diameter, therefore, if the lengths of the lower clamping ring, the upper clamping ring and the stabilizing piece are consistent when the pipelines with all diameters are welded, the contact condition of the end surfaces of the pipeline cannot be ensured to be consistent in the welding process, therefore in this scheme, through snap ring down, go up the length of snap ring and stabilizer blade and the diameter of pipeline and be related, and then under the condition of different pipeline diameters, through the back of embracing of last snap ring and lower snap ring, through the support of stabilizer blade, and then make the axis of two pipelines keep the state of coincidence in the welding machine within range, make the terminal surface of two pipelines laminate completely, when exerting pressure simultaneously, make the pressure direction that two pipelines received unanimous, and then guarantee that the extrusion that fused pipeline received keeps unanimous, and then improved welded quality.

Preferably, the upper part of the movable clamping shell is provided with a square hole; an observation sheet is arranged inside the square hole; the observation sheet is fixedly connected with the movable clamping shell; the observation sheet is made of transparent materials; and air outlet holes are uniformly arranged on the side surface of the fused ring fixed ring at intervals along the circumferential direction.

During the operation, in the process of carrying out hot-melt welding, the heating time, the heating temperature and the control of the pressure in the welding process are required to be adjusted by observing the state of the melt ring, and whether the welding is finished or not is judged by observing the state of the melt ring; therefore through being provided with the observation piece on the fixing clip shell in this scheme, and then can observe the inside condition of vacuum part through the observation piece, simultaneously through setting up the venthole on fused ring design circle side, observe and judge the inside filling condition of fused ring (for example when the fused ring design circles the department gas pocket of peak and when outwards overflowing the pipe wall of molten state in the gas pocket, then explain that fused ring design circle is inside to be full of, this moment alright with the stop heating, wait for the fused ring cooling design), and then the operator of being convenient for judges the state of welding, and then as the foundation of operation on next step, and then reduced the use degree of difficulty of welding machine, and then improved the practicality of welded joint.

Preferably, the inner sides of the stabilizing sheet and the fused ring shaping ring are coated with release agents.

The during operation, because the pipeline after the melting has certain viscidity, and then in welding process, pipeline after the melting has certain bonding between with stabilizing piece and the fused ring set collar, and then lead to pipeline and welding machine to be difficult to separate after the welding is accomplished, and then there is the risk of damaging the pipeline at the in-process of separation, therefore in this scheme, through scribbling the release agent at stabilizing piece and fused ring set collar inboard, and then reduced the pipeline after the melting and the viscidity between stabilizing piece and the fused ring set collar, and then prevent pipeline after the melting and stabilizing piece and melt between the set collar and bond, and then make pipeline and welding machine can separate easily after the welding, and then prevent to damage the pipeline when the separation, also make the use of welding machine more simple and convenient simultaneously.

Preferably, the plugging component comprises a plug, a valve core and a middle shaft, and the middle shaft is arranged in the plug; the middle shaft is fixedly connected with the plug; the middle shaft is arranged in a hollow mode; the valve core is arranged on one side of the middle shaft; the valve core is fixedly connected with the middle shaft; the air holes are uniformly arranged at intervals in the circumferential direction of the middle shaft.

When the pipeline sealing device works, the end caps are placed at two ends of the pipeline through arrangement, so that preliminary sealing of the two ends of the pipeline is realized, gas is flushed into the pipeline through the valve cores, and along with the increase of the pressure inside the pipeline, the pressure inside the end caps is increased due to the fact that the air holes are formed in the middle shaft, so that the pressure between the side walls of the end caps and the pipe wall is increased, the sealing performance between the end caps and the pipe wall is further increased, the positive pressure inside the pipeline is further ensured, the pressure difference between the inside and the outside of the pipeline in the welding process is further ensured, the smooth outward diffusion of the wall of the molten pipe in the welding process is further ensured, and the welding quality is further ensured; meanwhile, as no pressure exists in the pipeline, the pressure between the pipeline and the plug is small, so that the friction between the plug and the pipe wall is small, the plug is more easily placed into the inner wall of the pipeline, and the plug part is more convenient to install.

Preferably, the sealing ring is of a hollow structure; the sealing ring is internally filled with a medium; the media expands in volume when heated.

The during operation, because the pipeline needs the heating at the in-process that carries out the welding, consequently at the welded in-process, make the pipeline be heated, and then make the sealing washer temperature increase, and then make the inside medium inflation of sealing washer, and then make the volume increase of sealing washer, and then make the pressure increase of sealing washer effect on the pipeline, and then improved the sealing performance between sealing washer and the pipeline, and then guarantee the stability of the outside negative pressure of pipe connection department, and then guarantee the inside and outside pressure differential of pipe connection department in the welding process, and then the smooth outdiffusion of fused pipe wall ability when guaranteeing the welding, and then guarantee the welded quality.

The invention has the following beneficial effects:

1. in the process of laying the municipal pipe network, the length of a single pipeline is limited, so that the pipelines are required to be connected, a hot-melt welding machine is used for hot-melt welding in the connection of the plastic pipelines, the end parts of the pipelines are melted firstly in the hot-melt welding process, then pressure is applied to the axial direction of the pipelines, so that the end parts of the pipelines after hot melting are bonded, and the connection of the plastic pipelines is completed, but the rigidity of the plastic pipelines after melting is poor, so that the periphery of the plastic pipelines can be diffused and deformed after extrusion force is applied, and as the cross sections of the pipelines are circular, part of the melted pipe walls are diffused into the pipelines finally along with the diffusion of the melted pipe walls, so that the inner walls of the pipelines are provided with bulges (such as shown in figure 9) at the connection positions, and the inner diameters of the pipelines are smaller, so that the water passing area of the pipeline is reduced, and the conveying efficiency of the pipeline is reduced; therefore, in the scheme, when the plastic pipeline is welded, the end parts of the pipelines at two ends are butted and then placed in the vacuum component, through the work of the vacuum component, negative pressure is formed outside the pipeline joint, meanwhile, the inside of the pipeline forms a closed space, then, through an external positive pressure gas source, gas is introduced into the pipeline, so that positive pressure is formed inside the pipeline, pressure difference is formed inside and outside the pipeline at the pipeline joint, further, the pipeline has the tendency of outward expansion at the joint, then, through the heating rod, the pipeline joint is heated and melted, further, the plasticity of the side wall of the pipeline is increased, further, under the action of the pressure difference inside and outside the pipeline, the pipe wall is subjected to outward radial force in the joint, and in the process, through the arranged extrusion component, the pipelines at two ends are extruded to the joint along the axial direction, so that the pipelines are subjected to extrusion force in the axial direction, the pipe wall at the joint can keep a continuous pressurization state, and the fused part of the pipeline is continuously turned outwards due to the existence of radial force in the outward direction; and then make the pipeline wall after the melting not enter into inside the pipeline (for example as shown in fig. 10), and then make the diameter of pipeline junction can not reduce, make the pipeline cross the water area at the junction can not reduce simultaneously, and then guaranteed the conveying ability behind the pipe connection, and then improved the quality of pipe connection.

2. In the invention, the buckle between the movable clamping shell and the fixed clamping shell is opened, then the movable clamping shell is rotated, so that the upper part of the fixed clamping shell is not blocked, the pipeline is conveniently placed in the vacuum component, the end parts of the pipelines at two ends are butted and then placed on the fixed clamping shell, the joint of the two pipelines is positioned at the middle position of the fused ring shaping ring by moving, then the movable clamping shell is rotated and the buckle is fastened, so that the movable clamping shell and the fixed clamping shell form a finished tubular structure, so that a closed space is formed inside the movable clamping shell and the fixed clamping shell, then a vacuum pump works, so that a negative pressure area is formed inside the movable clamping shell and the fixed clamping shell, and along with the fixed clamping shell and the fixed clamping shell forming a closed area, a stable sheet and a fused ring shaping ring in the movable clamping shell and a stable sheet and a fused ring shaping ring in the fixed clamping shell and a closed tubular structure are formed by the fused ring shaping ring in the fixed clamping shell, the connecting pipe is placed inside the stabilizing piece, the sealing ring is arranged on the inner side of the stabilizing piece, and through holes are symmetrically formed in the two ends of the fused ring fixing ring at uniform intervals, so that a negative pressure area is formed between the fused ring fixing ring and the pipeline, pressure difference is generated between the inside and the outside of the joint of the pipeline, and radial force in an outward direction is generated, so that the fused pipe wall moves outwards in the hot melting connection process, the fused pipe wall is prevented from reducing the inner diameter of the pipeline, and the transportation performance of the hot melting connection groove pipeline is ensured; meanwhile, the fused ring shaping ring is arranged outside the pipeline, so that the outward diffused fused pipe wall is limited, the fused ring with a regular shape is finally formed, the outward diffused fused pipe wall is prevented from dropping due to gravity, the fused ring formed at the hot-melt joint is prevented from generating defects in the circumferential direction, and the connection strength of the hot-melt joint is further reduced, so that the quality of the hot-melt welding fused ring is improved through the arranged fused ring shaping ring, and the quality of the hot-melt welding is further improved; meanwhile, in the process of carrying out hot-melt welding, due to heat transfer, the length of hot melt is not limited to a connecting part, and the hot melt can often radiate to a certain range of a pipeline, and in the scheme, gas with positive pressure is arranged inside the pipeline, so that the pipe wall is subjected to outward force, the pipe wall is expanded outwards, and further the pipe section of the pipeline, which is influenced by the heat of the hot-melt welding, is deformed; simultaneously because the through-hole that sets up is the symmetry setting, and then can insert strengthening rib (steel wire, nylon rope, rope made of hemp etc.) as required in the through-hole, and then at pipeline welded in-process, the pipeline lateral wall after the melting enters into the inside back of fused ring design circle, bonds with the strengthening rib, and then makes the strengthening rib gomphosis inside the fused ring, and then has increased the pipeline at axial joint strength, and then has improved pipeline welded quality.

3. In the invention, in the process of thermal welding of the pipelines, external force is required to be applied to enable the pipelines at two ends to be close to each other, so that the fused pipe walls between the pipelines can be bonded together, the applied pressure needs to be accurately controlled, if the applied pressure is increased, the fused ring of the pipeline is overlarge, and if the applied pressure is smaller, the welding between the pipelines at two ends is not tight enough; therefore, in the scheme, when welding is carried out, the fastening bolt is loosened, then the upper clamping ring is rotated to enable the upper clamping ring to be separated from the upper part of the lower clamping ring, then the pipeline is placed in the lower clamping ring, the upper clamping ring is pressed towards the lower clamping ring by rotating the upper clamping ring, the fastening bolt is locked, then the upper clamping ring and the lower clamping ring clamp the pipeline, when axial pressure needs to be exerted, the hydraulic cylinder is controlled to move, the movable frame is further driven to move along the square of the sliding rail, the pipelines are further driven to mutually pressurize, axial pressure is further generated, further the fused pipelines can be mutually extruded, further the adhesion between the fused pipelines is increased, and further the pipeline welding is firmer; because the part of the power provided is the hydraulic cylinder, the mutual extrusion force among the pipelines can be controlled by controlling the oil pressure in the hydraulic cylinder, and because the pressure output by the pressure cylinder is relatively stable and has no vibration, the welding position can not be vibrated in the pipeline welding process, and the welding quality is improved; secondly because the welding machine has certain height, consequently at the welding process who carries out the pipeline, under the effect of gravity, can make the butt joint position of pipeline appear slight deflection, and then can lead to the tip of pipeline can not laminate completely (for example shown in fig. 11), and then lead to the fact revealing of internal pressure, and then cause the pipeline welding to be difficult to go on or cause the welding department to receive radial bending force, and then cause welded quality to reduce, consequently through last snap ring and the lower snap ring that sets up, and then embrace the pipeline completely and clip, and then make the pipeline at two pressurized component middle parts keep the level, and do not receive radial bending force, and then make the terminal surface of two pipelines can laminate completely, and then improved welded quality.

4. In the invention, because the welding machine has a certain height, the butt joint position of the pipeline slightly deflects under the action of gravity in the process of welding the pipeline, so that the end parts of the pipeline cannot be completely attached (for example, as shown in figure 11), the internal pressure is leaked, the pipeline welding is difficult to carry out or the welding position is subjected to radial bending force, the welding quality is reduced, meanwhile, in the process of welding the plastic pipeline, the deadweight of the pipelines with different diameters per unit length is inconsistent, the plastic pipelines with different diameters can be also inconsistent in bending performance, so that the bending degree of the pipeline is related to the diameter, therefore, if the lengths of the lower clamping ring, the upper clamping ring and the stabilizing piece are consistent when the pipelines with all diameters are welded, the contact condition of the end surfaces of the pipeline cannot be ensured to be consistent in the welding process, therefore in this scheme, through snap ring down, go up the length of snap ring and stabilizer blade and the diameter of pipeline and be related, and then under the condition of different pipeline diameters, through the back of embracing of last snap ring and lower snap ring, through the support of stabilizer blade, and then make the axis of two pipelines keep the state of coincidence in the welding machine within range, make the terminal surface of two pipelines laminate completely, when exerting pressure simultaneously, make the pressure direction that two pipelines received unanimous, and then guarantee that the extrusion that fused pipeline received keeps unanimous, and then improved welded quality.

5. In the process of carrying out hot-melt welding, the heating time, the heating temperature and the pressure in the welding process are controlled by observing the state of the melt ring to adjust, and the state of the melt ring is observed to judge whether the welding is finished or not, but in the scheme, because the sealing state is kept between the fixed clamping shells behind the movable clamping shells in the welding process, the condition of an internal welding machine is difficult to observe visually, a welding operator cannot observe the welding progress and condition visually, and the welding cannot be stopped timely after the welding is finished; therefore through being provided with the observation piece on the fixing clip shell in this scheme, and then can observe the inside condition of vacuum part through the observation piece, simultaneously through setting up the venthole on fused ring design circle side, observe and judge the inside filling condition of fused ring (for example when the fused ring design circles the department gas pocket of peak and when outwards overflowing the pipe wall of molten state in the gas pocket, then explain that fused ring design circle is inside to be full of, this moment alright with the stop heating, wait for the fused ring cooling design), and then the operator of being convenient for judges the state of welding, and then as the foundation of operation on next step, and then reduced the use degree of difficulty of welding machine, and then improved the practicality of welded joint.

Drawings

The invention will be further explained with reference to the drawings.

FIG. 1 is a schematic view of the overall structure of the welding machine of the present invention during welding;

FIG. 2 is a schematic view of a second overall configuration of the welder in an expanded state of the invention;

FIG. 3 is a schematic view of a first internal structure of the welder of the present invention;

FIG. 4 is a second internal schematic view of the welder of the present invention;

FIG. 5 is a schematic view of the internal structure of the seal ring of the present invention;

FIG. 6 is a schematic view of the construction of the plugging member of the present invention;

FIG. 7 is a schematic view showing the internal structure of the plugging member according to the present invention;

FIG. 8 is a schematic view of the construction of a fused ring set-up ring according to the present invention;

FIG. 9 is a schematic view showing the formation of a melt ring in the conventional thermal welding of the present invention;

FIG. 10 is a schematic illustration of the formation of a melt ring when welded using an internal melt ring elimination welder in accordance with the present invention;

FIG. 11 is a schematic view of the pipe in the present invention, as welded, without the support at the ends of the pipe;

in the figure: the device comprises a base 1, a heating rod 2, an extrusion component 3, a plugging component 4, a vacuum component 5, a fixed clamping shell 51, a movable clamping shell 52, a stabilizing sheet 53, a fused ring shaping ring 54, a vacuum pump 55, a sealing ring 56, a through hole 57, a movable frame 31, a slide rail 32, a slide block 33, an upper clamping ring 34, a lower clamping ring 35, a fastening bolt 36, a hydraulic cylinder 37, an observation sheet 6, an air outlet 7, a plug 41, a valve core 42, a middle shaft 43 and an air hole 44.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.

As shown in fig. 1 to 11, a welding machine for removing an inner molten ring of a hot-melt welded plastic pipe comprises a base 1, a heating rod 2, a pressing part 3, a blocking part 4 and a vacuum part 5; the vacuum component 5 is arranged on the upper part of the base 1, and the vacuum component 5 is used for clamping a pipeline joint and providing a vacuum environment outside a pipeline welding position; one side of the vacuum component 5 is provided with the heating rod 2; the heating rod 2 is connected with the vacuum component 5; the heating rod 2 is positioned on the outer side of the pipeline welding position; the two sides of the vacuum part 5 are symmetrically provided with the extrusion parts 3; the extrusion component 3 is used for applying axial extrusion force to the welded pipeline; the welding machine is provided with at least two plugging components 4, and the plugging components 4 are used for plugging two ports of a welded pipeline; the blocking part 4 is communicated with an external positive pressure gas source.

During operation, during the laying process of the municipal pipe network, the length of a single pipe is limited, so that the pipes must be connected, during the connection of the plastic pipes, hot-melt welding is performed through a hot-melt welding machine, during the hot-melt welding process, the end parts of the pipes are melted first, then pressure is applied in the axial direction of the pipes, so that the end parts of the pipes after hot melting are bonded, and the connection of the plastic pipes is completed, but after the plastic pipes are melted, the rigidity of the plastic pipes is poor, so that the periphery of the plastic pipes can be diffused and deformed after extrusion force is applied, as the cross sections of the pipes are circular, and as the pipe walls after melting are diffused, part of the melted pipe walls are diffused into the pipes, and then the inner walls of the pipes are protruded at the connecting parts (such as shown in fig. 9), so that the inner diameters of the pipes are small, so that the water passing area of the pipeline is reduced, and the conveying efficiency of the pipeline is reduced; therefore, in the scheme, when the plastic pipeline is welded, the end parts of the pipelines at two ends are butted and then placed in the vacuum component 5, through the work of the vacuum component 5, negative pressure is formed outside the pipeline joint, meanwhile, the inside of the pipeline forms a closed space through the plugging component 4, then, through an external positive pressure gas source, gas is introduced into the pipeline, so that positive pressure is formed inside the pipeline, pressure difference is formed inside and outside the pipeline at the pipeline joint, further, the pipeline has the tendency of outward expansion at the joint, then, through the heating rod 2, the pipeline joint is heated and melted, further, the plasticity of the side wall of the pipeline is increased, further, under the action of the pressure difference between the inside and the outside of the pipeline, further, the joint is subjected to radial force in the outward direction, and in the process, through the arranged extrusion component 3, the pipelines at two ends are extruded to the joint along the axial direction, so that the pipelines are subjected to extrusion force in the axial direction, the pipe wall at the joint can keep a continuous pressurization state, and the fused part of the pipeline is continuously turned outwards due to the existence of radial force in the outward direction; and then make the pipeline wall after the melting not enter into inside the pipeline (for example as shown in fig. 10), and then make the diameter of pipeline junction can not reduce, make the pipeline cross the water area at the junction can not reduce simultaneously, and then guaranteed the conveying ability behind the pipe connection, and then improved the quality of pipe connection.

As shown in fig. 1 to 4, the vacuum part 5 includes a fixed clamp shell 51, a movable clamp shell 52, a stabilizing sheet 53, a fused ring shaping ring 54, a vacuum pump 55 and a sealing ring 56; a fixed clamping shell 51 is arranged at the upper part of the base 1; the fixed clamping shell 51 is fixedly connected with the base 1; the movable clamping shell 52 is arranged at the upper part of the fixed clamping shell 51; the fixed clamping shell 51 is rotationally connected with one side surface of the movable clamping shell 52 through a pin shaft; the other side surfaces of the fixed clamping shell 51 and the movable clamping shell 52 are provided with buckles; the inner parts of the fixed clamping shell 51 and the movable clamping shell 52 are symmetrically provided with the fused ring shaping ring 54; the fused ring shaping ring 54 is of a semi-cylindrical structure; the two ends of the fused ring fixing ring 54 are symmetrically provided with the stabilizing pieces 53; one end of the stabilizing sheet 53 is fixedly connected with the fused ring shaping ring 54; the stabilizing piece 53 is of a semi-cylindrical structure; the side surface of the stabilizing sheet 53 close to the fixing clamp shell 51 is fixedly connected with the fixing clamp shell 51; the side surface of the stabilizing sheet 53 close to the movable clamping shell 52 is fixedly connected with the movable clamping shell 52; the inner side of the stabilizing piece 53 is provided with a groove; the sealing ring 56 is arranged in the groove; the sealing ring 56 is clamped with the groove; the vacuum pump 55 is arranged at the upper part of the base 1; the vacuum pump 55 is fixedly connected with the base 1; the inner side of the movable clamping shell 52 is communicated with the vacuum pump 55 through a hose; the heating rods 2 are symmetrically arranged on one side surfaces of the fixed clamping shell 51 and the movable clamping shell 52; the heating rod 2 is respectively and fixedly connected with the fixed clamping shell 51 and the movable clamping shell 52; through holes 57 are symmetrically formed at two ends of the fused ring shaping ring 54 at uniform intervals.

During operation, open the buckle between activity card shell 52 and the fixed card shell 51, back rotation activity card shell 52, and then make the upper portion of fixed card shell 51 not shelter from, and then be convenient for place the pipeline inside vacuum part 5, after placing into fixed card shell 51 after the tip butt joint of both ends pipeline, through removing, make the seam of two pipelines be located the intermediate position of fused ring design circle 54, back rotation activity card shell 52, and the straining buckle, and then make activity card shell 52 and fixed card shell 51 constitute the tubular structure of accomplishing, and then make activity card shell 52 and fixed card shell 51 inside form airtight space, later through the work of vacuum pump 55, and then make activity card shell 52 and fixed card shell 51 inside form the negative pressure region, along with fixed card shell 51 and fixed card shell 51 constitute airtight region, and then make stabilizer 53 and fused ring design circle 54 in the activity card shell 52 and the stabilizer 53 and fused ring design circle 54 in the fixed card shell 51 and fuse ring design circle 54 in constitute an airtight circle The inner part of the tubular structure is provided with a connecting pipe, the inner side of the stabilizing sheet 53 is provided with a sealing ring 56, and through holes 57 are symmetrically formed at two ends of the fused ring shaping ring 54 at even intervals, so that a negative pressure area is formed between the fused ring shaping ring 54 and the pipeline, pressure difference is generated inside and outside the pipeline joint, and outward radial force is generated, so that the fused pipe wall moves outwards in the process of hot melting connection, the fused pipe wall is prevented from reducing the inner diameter of the pipeline, and the transportation performance of the hot melting connection channel pipeline is ensured; meanwhile, the fused ring shaping ring 54 is arranged outside the pipeline, so that the outward diffused fused pipe wall is limited, a fused ring with a regular shape is finally formed, the outward diffused fused pipe wall is prevented from dropping due to gravity, the fused ring formed at the hot-melt joint is prevented from generating defects in the circumferential direction, and the connection strength of the hot-melt joint is further reduced, so that the quality of the hot-melt welding fused ring is improved through the arranged fused ring shaping ring 54, and the quality of the hot-melt welding is further improved; meanwhile, in the process of carrying out hot-melt welding, due to heat transfer, the length of hot melt is not limited to a connecting part, and the hot melt can often radiate to a certain range of a pipeline, and in the scheme, gas with forward pressure is arranged inside the pipeline, so that the pipe wall is subjected to outward force, the pipe wall is expanded outwards, and further the pipe section of the pipeline, which is influenced by the heat of the hot-melt welding, is deformed, so that the outer wall of the pipeline is completely cut after the stabilizing sheet 53 is clamped in the scheme, the pipeline is restrained in the radial direction, and further, when the pipeline is influenced by heating, the pipeline cannot expand outwards and deform due to the action of internal air pressure, so that the pipeline is not damaged in the connecting process, and the practicability of a hot-melt welding machine is improved; simultaneously because the through-hole 57 that sets up for the symmetry, and then can insert strengthening rib (steel wire, nylon rope, rope made of hemp etc.) as required in through-hole 57, and then at pipeline welded in-process, the pipeline lateral wall after the melting enters into the inside back of fused ring design circle 54, bonds with the strengthening rib, and then makes the strengthening rib gomphosis inside the fused ring, and then has increased the pipeline at axial joint strength, and then has improved pipeline welded quality.

As shown in fig. 1 to 5, the pressing member 3 includes a movable frame 31, a slide rail 32, a slider 33, an upper snap ring 34, a lower snap ring 35, a fastening bolt 36, and a hydraulic cylinder 37; the slide rails 32 are symmetrically arranged on the upper part of the base 1; the slide rail 32 is fixedly connected with the base 1; the upper part of the slide rail 32 is connected with a slide block 33 in a sliding way; the movable frame 31 is arranged at the upper part of the sliding block 33; the movable frame 31 is fixedly connected with the sliding block 33; the upper part of the movable frame 31 is provided with the lower clamping ring 35; the lower clamping ring 35 is fixedly connected with the movable frame 31; the upper snap ring 34 is arranged at the upper part of the lower snap ring 35; the lower clamping ring 35 is rotatably connected with one side of the upper clamping ring 34 through a pin shaft; the other side of the lower clamping ring 35 is provided with a threaded hole; fastening bolts 36 are symmetrically arranged on the other side of the upper clamping ring 34; the fastening bolt 36 is rotatably connected with the upper snap ring 34; the hydraulic cylinder 37 is arranged at the upper part of the base 1; the hydraulic cylinder 37 is fixedly connected with the base 1; one end of a movable rod of the hydraulic cylinder 37 is fixedly connected with the movable frame 31.

When the pipeline fusion welding device works, external force needs to be applied to enable the pipelines at the two ends to be close to each other in the fusion welding process of the pipelines, so that the fused pipe walls between the pipelines can be bonded together, the applied pressure needs to be accurately controlled, if the applied pressure is increased, the pipeline fusion ring is too large, and if the applied pressure is smaller, the welding between the pipelines at the two ends is not tight enough; therefore, in the scheme, when welding is performed, the fastening bolts 36 are loosened, then the upper clamping ring 34 is rotated, the upper clamping ring 34 is separated from the upper part of the lower clamping ring 35, then the pipeline is placed in the lower clamping ring 35, the upper clamping ring 34 is pressed towards the lower clamping ring 35 by rotating the upper clamping ring 34, the fastening bolts 36 are locked, then the upper clamping ring 34 and the lower clamping ring 35 clamp the pipeline in an embracing mode, when axial pressure needs to be applied, the hydraulic cylinder 37 is controlled to move, the movable frame 31 is further driven to move along the square of the sliding rail 32, the pipelines are further driven to pressurize mutually, axial pressure is further generated, then the molten pipelines can be mutually extruded, the adhesion between the molten pipelines is further increased, and the pipeline welding is firmer; because the part of the power provided is the hydraulic cylinder 37, the mutual extrusion force between the pipelines can be controlled by controlling the oil pressure in the hydraulic cylinder 37, and because the pressure output by the pressure cylinder is relatively stable and has no vibration, the welding part can not vibrate in the pipeline welding process, and the welding quality is improved; secondly because the welding machine has certain height, consequently in the welding process who carries out the pipeline, under the effect of gravity, can make the butt joint position of pipeline appear slight deflection, and then can lead to the tip of pipeline can not laminate completely (for example shown in fig. 11), and then lead to the fact revealing of internal pressure, and then cause the pipeline welding to be difficult to go on or cause the welding department to receive radial bending force, and then cause welded quality to reduce, consequently through last snap ring 34 and the lower snap ring 35 that sets up, and then embrace the pipeline completely and clip, and then make the pipeline at two pressurized component middle parts keep the level, and do not receive radial bending force, and then make the terminal surface of two pipelines laminate completely, and then improved welded quality.

The axial length of the lower clamping ring 35 and the upper clamping ring 34 is not less than five times of the diameter of the welded pipeline; the length of the stabilizing piece 53 is not less than ten times the diameter of the welded pipe.

In operation, because the welding machine has a certain height, during the welding process of the pipeline, under the action of gravity, the butt joint position of the pipeline slightly deflects, which may cause the end portions of the pipeline not to be completely attached (for example, as shown in fig. 11), thereby causing leakage of internal pressure, thereby causing pipeline welding to be difficult to perform or causing the welding position to receive radial bending force, thereby causing welding quality to be reduced, meanwhile, during the welding process of the plastic pipeline, the deadweight of the pipelines with different diameters per unit length is inconsistent, and the plastic pipelines with different diameters can have different bending performances, thereby the bending degree of the pipeline is related to the diameter, therefore, if the lengths of the lower snap ring 35, the upper snap ring 34 and the stabilizing sheet 53 are all consistent when the pipelines with all diameters are welded, thereby ensuring that the contact conditions of the end surfaces of the pipeline are consistent during the welding process, therefore in this scheme, through linking down snap ring 35, go up snap ring 34 and stabilizer blade 53's length and the diameter of pipeline and be concerned with, and then under the condition of different pipeline diameters, through last snap ring 34 and the back of holding of lower snap ring 35, through stabilizer blade 53's support, and then make the axis of two pipelines keep the state of coincidence in the welding machine within range, make the terminal surface of two pipelines laminate completely, when exerting pressure simultaneously, make the pressure direction that two pipelines received unanimous, and then guarantee that the extrusion that fused pipeline received keeps unanimous, and then improved welded quality.

As shown in fig. 2 and 3, a square hole is formed at the upper part of the movable clamping shell 52; an observation sheet 6 is arranged in the square hole; the observation sheet 6 is fixedly connected with the movable clamping shell 52; the observation sheet 6 is made of transparent material; the side surface of the fused ring shaping ring 54 is provided with air outlet holes 7 at even intervals along the circumferential direction.

During operation, in the process of carrying out hot-melt welding, the heating time, the heating temperature and the control of pressure in the welding process are required to be adjusted by observing the state of the melt ring, and whether welding is finished or not is judged by observing the state of the melt ring, but in the scheme, because in the welding process, the sealing state is kept between the movable clamping shell 52 and the rear fixed clamping shell 51, the condition of an internal welding machine is difficult to observe visually, a welding operator cannot observe the welding progress and condition visually, and welding cannot be stopped timely after welding is finished; therefore, in the scheme, the observation sheet 6 is arranged on the fixing clamp shell 51, so that the condition inside the vacuum component 5 can be observed through the observation sheet 6, meanwhile, through the air outlet 7 arranged on the side surface of the fused ring fixing ring 54, the filling condition inside the fused ring is observed and judged (for example, when the pipe wall in the fused state overflows from the air hole at the highest point on the fused ring fixing ring 54, the situation that the inside of the fused ring fixing ring 54 is full is shown, at the moment, the heating can be stopped, the fused ring is waited for cooling and shaping), so that an operator can conveniently judge the welding state, and the judgment is further used as the basis of the next operation, so that the use difficulty of the welding machine is reduced, and the practicability of the welding is improved.

And release agents are coated on the inner sides of the stabilizing sheet 53 and the fused ring shaping ring 54.

During operation, because the pipeline after the melting has certain viscidity, and then in welding process, there is certain bonding between pipeline after the melting and stabilizing sheet 53 and fused ring design circle 54, and then lead to pipeline and welding machine to be difficult to separate after the welding is accomplished, and then there is the risk of damaging the pipeline at the in-process of separation, therefore in this scheme, through scribbling the release agent at stabilizing sheet 53 and fused ring design circle 54 inboard, and then reduced the pipeline after the melting and stabilize the viscidity between sheet 53 and the fused ring design circle 54, and then prevent pipeline after the melting and stabilizing sheet 53 and melt between the design circle and bond, and then make pipeline and welding machine can separate easily after the welding, and then prevent to damage the pipeline when the separation, also make the use of welding machine more simple and convenient simultaneously.

As shown in fig. 6 and 7, the blocking component 4 includes a plug 41, a valve core 42 and a central shaft 43, and the central shaft 43 is disposed inside the plug 41; the middle shaft 43 is fixedly connected with the plug 41; the middle shaft 43 is arranged in a hollow manner; the valve core 42 is arranged on one side of the middle shaft 43; the valve core 42 is fixedly connected with the middle shaft 43; the middle shaft 43 is provided with air holes 44 at uniform intervals in the circumferential direction.

When the pipeline sealing device works, the plugs 41 are placed at two ends of the pipeline through arrangement, so that preliminary sealing of the two ends of the pipeline is realized, gas is flushed into the pipeline through the valve cores 42, along with increase of pressure inside the pipeline, the pressure inside the plugs 41 is increased due to the fact that the air holes 44 are formed in the middle shafts 43, so that the pressure between the side walls of the plugs 41 and the pipe wall is increased, further the sealing performance between the plugs 41 and the pipe wall is increased, further positive pressure inside the pipeline is ensured, further pressure difference inside and outside the pipeline in the welding process is ensured, further smooth outward diffusion of the wall of the molten pipe during welding is ensured, and further the welding quality is ensured; meanwhile, as no pressure exists in the pipeline, the pressure between the pipeline and the plug 41 is small, so that the friction between the plug 41 and the pipe wall is small, the plug 41 is easier to put into the inner wall of the pipeline, and the installation of the plug 41 is more convenient.

As shown in fig. 5, the sealing ring 56 has a hollow structure; the sealing ring 56 is filled with a medium; the media expands in volume when heated.

In operation, because the pipeline needs to be heated in the welding process, consequently at the welded in-process, make the pipeline be heated, and then make sealing washer 56 temperature increase, and then make the inside medium inflation of sealing washer 56, and then make the volume increase of sealing washer 56, and then make the pressure increase that sealing washer 56 acts on the pipeline, and then improved the sealing performance between sealing washer 56 and the pipeline, and then guarantee the stability of the outside negative pressure of pipe connection department, and then guarantee the inside and outside pressure differential of pipe connection department in the welding process, and then the smooth outdiffusion of fused pipe wall ability when guaranteeing the welding, and then guarantee the welded quality.

During operation, during the laying process of the municipal pipe network, the length of a single pipe is limited, so that the pipes must be connected, during the connection of the plastic pipes, hot-melt welding is performed through a hot-melt welding machine, during the hot-melt welding process, the end parts of the pipes are melted first, then pressure is applied in the axial direction of the pipes, so that the end parts of the pipes after hot melting are bonded, and the connection of the plastic pipes is completed, but after the plastic pipes are melted, the rigidity of the plastic pipes is poor, so that the periphery of the plastic pipes can be diffused and deformed after extrusion force is applied, as the cross sections of the pipes are circular, and as the pipe walls after melting are diffused, part of the melted pipe walls are diffused into the pipes, and then the inner walls of the pipes are protruded at the connecting parts (such as shown in fig. 9), so that the inner diameters of the pipes are small, so that the water passing area of the pipeline is reduced, and the conveying efficiency of the pipeline is reduced; therefore, in the scheme, when the plastic pipeline is welded, the end parts of the pipelines at two ends are butted and then placed in the vacuum component 5, through the work of the vacuum component 5, negative pressure is formed outside the pipeline joint, meanwhile, the inside of the pipeline forms a closed space through the plugging component 4, then, through an external positive pressure gas source, gas is introduced into the pipeline, so that positive pressure is formed inside the pipeline, pressure difference is formed inside and outside the pipeline at the pipeline joint, further, the pipeline has the tendency of outward expansion at the joint, then, through the heating rod 2, the pipeline joint is heated and melted, further, the plasticity of the side wall of the pipeline is increased, further, under the action of the pressure difference between the inside and the outside of the pipeline, further, the joint is subjected to radial force in the outward direction, and in the process, through the arranged extrusion component 3, the pipelines at two ends are extruded to the joint along the axial direction, so that the pipelines are subjected to extrusion force in the axial direction, the pipe wall at the joint can keep a continuous pressurization state, and the fused part of the pipeline is continuously turned outwards due to the existence of radial force in the outward direction; further, the fused pipeline wall does not enter the pipeline (for example, as shown in fig. 10), so that the diameter of the pipeline joint is not reduced, and the water passing area of the pipeline at the joint is not reduced, so that the conveying capacity of the pipeline after connection is ensured, and the quality of pipeline connection is improved; open the buckle between activity card shell 52 and the fixed card shell 51, back rotation activity card shell 52, and then make the upper portion of fixed card shell 51 not shelter from, and then be convenient for place the pipeline inside vacuum part 5, after placing into fixed card shell 51 after the tip butt joint of both ends pipeline, through removing, make the seam of two pipelines be located the intermediate position of fused ring design circle 54, back rotation activity card shell 52, and the straining buckle, and then make activity card shell 52 and fixed card shell 51 constitute the tubular structure of accomplishing, and then make activity card shell 52 and fixed card shell 51 inside form airtight space, later through the work of vacuum pump 55, and then make activity card shell 52 and fixed card shell 51 inside form the negative pressure region, along with fixed card shell 51 and fixed card shell 51 constitute airtight region, and then make stabilizer 53 and fused ring design circle 54 in activity card shell 52 and the stabilizer 53 and fused ring design circle 54 in fixed card shell 51 constitute an airtight tubular structure Because the connecting pipe is placed in the pipe, the sealing ring 56 is arranged on the inner side of the stabilizing sheet 53, and the through holes 57 are symmetrically formed at the two ends of the fused ring shaping ring 54 at uniform intervals, so that a negative pressure area is formed between the fused ring shaping ring 54 and the pipeline, a pressure difference is generated between the inside and the outside of the joint of the pipeline, an outward radial force is generated, and the fused pipe wall moves outwards in the process of hot melt connection, so that the fused pipe wall is prevented from reducing the inner diameter of the pipeline, and the transportation performance of the hot melt connection groove pipeline is ensured; meanwhile, the fused ring shaping ring 54 is arranged outside the pipeline, so that the outward diffused fused pipe wall is limited, a fused ring with a regular shape is finally formed, the outward diffused fused pipe wall is prevented from dropping due to gravity, the fused ring formed at the hot-melt joint is prevented from generating defects in the circumferential direction, and the connection strength of the hot-melt joint is further reduced, so that the quality of the hot-melt welding fused ring is improved through the arranged fused ring shaping ring 54, and the quality of the hot-melt welding is further improved; meanwhile, in the process of carrying out hot-melt welding, due to heat transfer, the length of hot melt is not limited to a connecting part, and the hot melt can often radiate to a certain range of a pipeline, and in the scheme, gas with forward pressure is arranged inside the pipeline, so that the pipe wall is subjected to outward force, the pipe wall is expanded outwards, and further the pipe section of the pipeline, which is influenced by the heat of the hot-melt welding, is deformed, so that the outer wall of the pipeline is completely cut after the stabilizing sheet 53 is clamped in the scheme, the pipeline is restrained in the radial direction, and further, when the pipeline is influenced by heating, the pipeline cannot expand outwards and deform due to the action of internal air pressure, so that the pipeline is not damaged in the connecting process, and the practicability of a hot-melt welding machine is improved; simultaneously because the through-hole 57 that sets up for the symmetry, and then can insert strengthening rib (steel wire, nylon rope, rope made of hemp etc.) as required in through-hole 57, and then at pipeline welded in-process, the pipeline lateral wall after the melting enters into the inside back of fused ring design circle 54, bonds with the strengthening rib, and then makes the strengthening rib gomphosis inside the fused ring, and then has increased the pipeline at axial joint strength, and then has improved pipeline welded quality.

While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A welding machine for eliminating an inner fused ring of a hot-melt welding plastic pipe is characterized in that: comprises a base (1), a heating rod (2), an extrusion component (3), a plugging component (4) and a vacuum component (5); the vacuum component (5) is arranged on the upper part of the base (1); the vacuum component (5) is used for clamping the pipeline joint and providing a negative pressure environment outside the pipeline welding position; one side of the vacuum component (5) is provided with the heating rod (2); the heating rod (2) is connected with the vacuum component (5); the heating rod (2) is positioned on the outer side of the pipeline welding position; the extruding parts (3) are symmetrically arranged on two sides of the vacuum part (5); the extrusion component (3) is used for applying axial extrusion force to the welded pipeline; the welding machine is provided with at least two plugging parts (4), and the plugging parts (4) are used for plugging two ports of a welded pipeline; the plugging component (4) is communicated with an external positive pressure gas source.

2. A machine for welding with elimination of internal melting rings for plastic tubes for hot-melt welding according to claim 1, characterized in that it comprises: the vacuum component (5) comprises a fixed clamping shell (51), a movable clamping shell (52), a stabilizing sheet (53), a fused ring fixing ring (54), a vacuum pump (55) and a sealing ring (56); a fixed clamping shell (51) is arranged at the upper part of the base (1); the fixed clamping shell (51) is fixedly connected with the base (1); the movable clamping shell (52) is arranged at the upper part of the fixed clamping shell (51); the fixed clamping shell (51) is rotationally connected with one side surface of the movable clamping shell (52) through a pin shaft; a buckle is arranged on the other side surfaces of the fixed clamping shell (51) and the movable clamping shell (52); the fused ring fixing rings (54) are symmetrically arranged inside the fixed clamping shell (51) and the movable clamping shell (52); the fused ring fixed ring (54) is of a semi-cylindrical structure; the two ends of the fused ring fixing ring (54) are symmetrically provided with the stabilizing sheets (53); one end of the stabilizing sheet (53) is fixedly connected with the fused ring fixing ring (54); the stabilizing sheet (53) is of a semi-cylindrical structure; the side surface of the stabilizing sheet (53) close to the fixing clamping shell (51) is fixedly connected with the fixing clamping shell (51); the side surface of the stabilizing sheet (53) close to the movable clamping shell (52) is fixedly connected with the movable clamping shell (52); the inner side of the stabilizing sheet (53) is provided with a groove; the sealing ring (56) is arranged in the groove; the sealing ring (56) is clamped with the groove; the vacuum pump (55) is arranged at the upper part of the base (1); the vacuum pump (55) is fixedly connected with the base (1); the inner side of the movable clamping shell (52) is communicated with the vacuum pump (55) through a hose; the heating rods (2) are symmetrically arranged on one side surfaces of the fixed clamping shell (51) and the movable clamping shell (52); the heating rod (2) is respectively and fixedly connected with the fixed clamping shell (51) and the movable clamping shell (52); through holes (57) are symmetrically formed at two ends of the fused ring fixing ring (54) at even intervals.

3. A machine for welding plastic pipes with elimination of internal melting rings according to claim 2, characterized in that: the extrusion part (3) comprises a movable frame (31), a slide rail (32), a slide block (33), an upper clamping ring (34), a lower clamping ring (35), a fastening bolt (36) and a hydraulic cylinder (37); the sliding rails (32) are symmetrically arranged at the upper part of the base (1); the sliding rail (32) is fixedly connected with the base (1); the upper part of the slide rail (32) is connected with the slide block (33) in a sliding way; the movable frame (31) is arranged at the upper part of the sliding block (33); the movable frame (31) is fixedly connected with the sliding block (33); the upper part of the movable frame (31) is provided with the lower clamping ring (35); the lower clamping ring (35) is fixedly connected with the movable frame (31); the upper clamping ring (34) is arranged at the upper part of the lower clamping ring (35); the lower clamping ring (35) is rotatably connected with one side of the upper clamping ring (34) through a pin shaft; the other side of the lower clamping ring (35) is provided with a threaded hole; the other side of the upper clamping ring (34) is symmetrically provided with the fastening bolts (36); the fastening bolt (36) is rotatably connected with the upper clamping ring (34); the hydraulic cylinder (37) is arranged at the upper part of the base (1); the hydraulic cylinder (37) is fixedly connected with the base (1); one end of a movable rod of the hydraulic cylinder (37) is fixedly connected with the movable frame (31).

4. A machine for welding with elimination of internal melting rings for plastic tubes for hot-melt welding according to claim 3, characterized in that it comprises: the axial length of the lower clamping ring (35) and the axial length of the upper clamping ring (34) are not less than five times of the diameter of the welded pipeline; the length of the stabilizing piece (53) is not less than ten times the diameter of the welded pipe.

5. A machine for welding with elimination of internal melting rings for plastic tubes for hot-melt welding according to claim 4, characterized in that it comprises: the upper part of the movable clamping shell (52) is provided with a square hole; an observation sheet (6) is arranged inside the square hole; the observation sheet (6) is fixedly connected with the movable clamping shell (52); the observation sheet (6) is made of transparent material; and air outlet holes (7) are uniformly arranged on the side surface of the fused ring fixed ring (54) at intervals along the circumferential direction.

6. A machine for welding with elimination of internal melting rings for plastic tubes, according to claim 5, characterized in that it comprises: and release agents are coated on the inner sides of the stabilizing sheet (53) and the fused ring fixing ring (54).

7. A machine for welding with elimination of internal melting rings for plastic tubes, according to claim 6, characterized in that it comprises: the plugging component (4) comprises a plug (41), a valve core (42) and a middle shaft (43), and the middle shaft (43) is arranged in the plug (41); the middle shaft (43) is fixedly connected with the plug (41); the middle shaft (43) is arranged in a hollow manner; the valve core (42) is arranged on one side of the middle shaft (43); the valve core (42) is fixedly connected with the middle shaft (43); the middle shaft (43) is provided with air holes (44) at uniform intervals in the circumferential direction.

8. A machine for welding with elimination of internal melting rings for plastic tubes, according to claim 7, characterized in that it comprises: the sealing ring (56) is of a hollow structure; the sealing ring (56) is filled with a medium; the media expands in volume when heated.