阅读说明：本技术 一种地板布焊枪焊嘴、焊枪及方法 (Welding nozzle of floor cloth welding gun, welding gun and method ) 是由 赵民 夏海渤 张亚东 王浩 王荣源 于 2021-02-08 设计创作，主要内容包括：本发明提供了一种地板布焊枪焊嘴、焊枪及方法,其中,焊嘴包括：焊条固定管、热风管及封盖板和导热部件；所述导热部件、封盖板及两管体夹角的非连通管段共同构成焊条预热段,所述焊条预热段用于对焊条固定管中的冷焊条进行预热处理；热风管同侧的焊嘴底部为地板布预热段,所述地板布预热段具有垂直地面的地板布预热气窗以及缩径出气口,热风经内凹分风结构分风后,部分气体流出地板布预热气窗和缩径出气口,以对地板布两段预热。两段预热不仅能够保证地板布焊缝干燥清洁,还使得焊缝在焊条对其进行熔接前具有一定的热度,这有利于粘流态焊条在缝隙中保持良好的流动状态,充分填满地板布焊缝,获得最大的有效熔接面积,从而具有较高的焊接强度。(The invention provides a welding nozzle of a floor welding gun, a welding gun and a method, wherein the welding nozzle comprises: the welding rod fixing pipe, the hot air pipe, the sealing cover plate and the heat conducting component are arranged on the welding rod fixing pipe; the heat conducting component, the sealing cover plate and the non-communicated pipe sections at the included angles of the two pipe bodies jointly form a welding rod preheating section, and the welding rod preheating section is used for preheating cold welding rods in the welding rod fixing pipe; the bottom of the welding nozzle at the same side of the hot air pipe is a floor cloth preheating section, the floor cloth preheating section is provided with a floor cloth preheating air window and a diameter-reducing air outlet which are vertical to the ground, and after the hot air is distributed by the concave air distribution structure, part of the air flows out of the floor cloth preheating air window and the diameter-reducing air outlet so as to preheat two sections of floor cloth. The two-stage preheating can ensure that the welding seam of the floor cloth is dry and clean, and the welding seam has certain heat before the welding rod welds the welding seam, so that the welding seam is favorable for keeping a good flowing state of the viscous state welding rod in the seam, the welding seam of the floor cloth is fully filled, the maximum effective welding area is obtained, and the welding seam has higher welding strength.)

1. A floor cloth welding gun welding tip is characterized by comprising:

the welding rod fixing pipe, the hot air pipe, the sealing cover plate and the heat conducting component are arranged on the welding rod fixing pipe;

the cover sealing plates are positioned on two sides of a non-communicated pipe section of an included angle formed between the fixed pipe and the hot air pipe, the cover sealing plates partially cover the non-communicated pipe sections of the two pipe bodies to form a cover sealing area, and a heat conducting part is arranged in the cover sealing area;

the heat conducting component, the sealing cover plate and the non-communicated pipe sections at the included angles of the two pipe bodies jointly form a welding rod preheating section, and the welding rod preheating section is used for preheating cold welding rods in the welding rod fixing pipe;

the bottom of the welding nozzle on the same side of the hot air pipe is a floor cloth preheating section, the floor cloth preheating section is provided with a floor cloth preheating air window and a diameter-reducing air outlet which are vertical to the ground, and after hot air is distributed, part of air flows out of the floor cloth preheating air window and the diameter-reducing air outlet so as to preheat the floor cloth.

2. The floor welding gun nozzle as defined in claim 1 wherein, in said cap area, both of said tubular bodies have louvers for the electrode mounting tube louver and the hot blast tube louver, respectively.

3. The floor welding gun tip as set forth in claim 2, wherein said electrode-fixing tube louver and said hot blast tube louver each have a regular shape.

4. The welding torch tip according to claim 2, wherein said welding rod fixing tube louver and said hot blast tube louver have windows in the shape of parallel elongated holes or circular holes of 0 ° to 90 °, and the distance between adjacent holes is not less than the tube diameter of the tube body where 1/8 holes are located.

5. The welding gun tip according to claim 2 wherein said hot air duct louvers are reduced in diameter relative to said side tube body to form a hot air compression tube section;

preferably, the pipe diameter of the pipe body is reduced within the range of 1/10 phi-1/4 phi, and phi is the pipe diameter of the hot air pipe.

6. The floor-cloth welding gun tip according to claim 1, wherein said heat-conducting member is a dense-teeth-type heat-conducting fin, and an upper end thereof is closed;

preferably, the dense-tooth-shaped heat conducting fin is made of a stainless steel material, an aluminum alloy material, a copper material or a C/C composite material.

7. The welding torch tip according to claim 1, wherein said floor cloth preheating louver has a window shape of parallel slots of 0 ° or 90 °, and a distance between adjacent air holes is not less than 1/8 ° where Φ is a diameter of the hot air duct.

8. The welding torch tip of claim 1, wherein said reduced diameter outlet is adjacent to the pre-heating louver of the floor cloth, the diameter of the outlet is 1/5-1/3 phi, phi is the diameter of the hot air pipe, and the angle between the cross section of the outlet and the ground is 15-75 deg.

9. The welding torch tip according to claim 1, wherein the connection between the pre-heating louver of the floor cloth and the inner tube body of the outlet of the welding rod fixing tube has a concave air distributing structure for distributing the hot air.

10. The welding torch tip according to claim 9, wherein a portion of the diverted hot air flowing to the outlet of the electrode fixing tube is mixed with the preheated electrode to melt the electrode to a viscous state, and the plastic electrode is pressed to form and fill the weld; the other part of the hot air is discharged out of the pipe body to carry out coherent treatment of dust removal, water vapor removal and two-stage preheating on the welding seam of the floor cloth.

11. A welding gun, characterized in that the welding gun comprises the welding nozzle as claimed in any one of the claims 1 to 11, the hot air pipe is provided with a strip-shaped clamping groove, and the hot air pipe is fixed on the welding gun nozzle through the strip-shaped clamping groove.

12. The method of claim 11, including:

starting a heating power switch, gradually adjusting a heating temperature gear from low to high to a temperature gear required by welding construction, and keeping the temperature for a certain time at the construction temperature until the temperature of hot air at the outlet of a welding rod fixing pipe is basically stable;

guiding welding rods into the welding rod fixing pipe, horizontally moving a welding gun at a constant speed along the direction of a welding seam, and applying downward pressure to the welding rods through a welding rod extrusion plate to uniformly press the welding rods in a viscous state into the welding seam of the floor cloth;

and after welding, cutting off redundant welding rods, adjusting the heating temperature to the lowest, and after blowing for several minutes, turning off the power supply after all the components are cooled.

Technical Field

The invention belongs to the technical field of welding of floor cloth of a railway vehicle, and particularly relates to a welding nozzle of a welding gun of the floor cloth, the welding gun and a method.

Background

The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.

The rail transit industry plays an increasingly important role in promoting the modernization construction process. As one of interior trims of rail vehicles, floor cloth is required to satisfy requirements of environmental protection, beauty, easy cleaning, and the like, and also to have practical performances such as good flame retardancy, treading comfort, durability, and the like. The railway vehicle floor cloth paving belongs to a special process, and is limited by the length, the width and the width of the vehicle floor, so that the vehicle body floor is difficult to be paved by the whole floor cloth, and the process is completed by splicing a plurality of pieces of floor cloth. However, a certain gap is inevitably formed between two adjacent floor cloths, and the solution is to weld the gap by using a welding rod made of thermoplastic PVC or rubber after the gap is grooved. In the floor cloth welding process, a welding gun is one of essential important tools, and a welding nozzle is a core component of the welding gun, and the structure and the functional design of the welding nozzle have important influence on the welding quality.

The inventor finds out in research that at present, a commercially available Y-shaped welding tip or a triangular welding tip is mostly adopted as a welding tip of a welding gun for floor cloth of a railway vehicle, but after long-term construction process and welding failure analysis, the following series of problems are found:

(i) the heat energy loss is severe. The temperature and the air quantity required by the molten welding rod are generally higher, the effective utilization point of heat energy is only the through part of the welding rod fixing pipe and the hot air pipe body, the welding rod is heated and molten, most of hot air is vertically blown to the floor through the opening at the lower end of the welding nozzle and then is dissipated, and even the hot air back flushing phenomenon of the welding rod fixing pipe exists, so that the construction operation is influenced.

(ii) Welding rod hot melting deviation. The thermoplastic welding rod is heated by hot air and then quickly converted from a cold solid state to a viscous state, and then the welding seam is filled by pressing through an outlet extrusion plate. In the hot melting process, the heating sites of the welding rod are too concentrated and are mainly scattered at the intersection of the outlet of the welding rod fixing pipe and hot air. The temperature range of the welding rod when reaching the ideal viscous state is narrow, and the welding gun temperature adjustment change range is large due to different experience and operation environments of operators in the construction process. The welding rod can not flow sufficiently to fill the welding seam due to too low hot melting temperature, and the welding rod is excessively melted due to too high hot melting temperature to cause difficult extrusion and shaping, even close to the thermal decomposition temperature of the welding rod, so that the edge of the floor cloth is scalded or the welding strip part is burnt and coked, and finally the welding strength of the welding seam is not up to the standard.

(iii) The pre-welding treatment effect of the floor cloth is not ideal. The seams of the floor cloths are usually treated by blowing air before welding to remove dust and foreign particles present in the seams. However, a certain time difference exists between the blowing treatment and the welding implementation, so that the real-time continuous operation is difficult to realize, and the floating dust falling phenomenon is easy to occur due to the space limitation of the vehicle body, thereby increasing the process complexity and the labor output and causing adverse effects on the welding seam. In addition, under the construction environment with low temperature or high humidity, the problem of raw material supercooling and surface moisture adsorption cannot be well solved by blowing treatment before welding.

The above-mentioned problem all produces adverse effect to floor cloth welding work progress and quality, probably leads to the welding seam fusion strength not enough, makes rail vehicle appear floor cloth welding seam fracture, sealed not tight scheduling situation in the operation in-process of back stage, and this not only causes ground appearance state poor, brings bad visual experience for the passenger, still because the infiltration corrodes automobile body floor and causes the corrosion, reduces vehicle operation maintenance cycle by a wide margin.

Disclosure of Invention

The invention provides a welding nozzle of a welding gun for a floor cloth, the welding gun and a welding method for solving the problems.

According to some embodiments, the invention adopts the following technical scheme:

in a first aspect, a floor welding gun welding tip is disclosed, comprising:

the welding rod fixing pipe, the hot air pipe, the sealing cover plate and the heat conducting component are arranged on the welding rod fixing pipe;

the cover sealing plates are positioned on two sides of a non-communicated pipe section of an included angle formed between the fixed pipe and the hot air pipe, the cover sealing plates partially cover the non-communicated pipe sections of the two pipe bodies to form a cover sealing area, and a heat conducting part is arranged in the cover sealing area;

the heat conducting component, the sealing cover plate and the non-communicated pipe sections at the included angles of the two pipe bodies jointly form a welding rod preheating section, and the welding rod preheating section is used for preheating cold welding rods in the welding rod fixing pipe;

the bottom of the welding nozzle on the same side of the hot air pipe is a floor cloth preheating section, the floor cloth preheating section is provided with a floor cloth preheating air window and a diameter-reducing air outlet which are vertical to the ground, and after the hot air is distributed by the concave air distribution structure, part of air flows out of the floor cloth preheating air window and the diameter-reducing air outlet so as to preheat the floor cloth.

According to the further technical scheme, the two pipe bodies in the sealing cover area are provided with air windows which are respectively a welding rod fixing pipe air window and a hot air pipe air window.

Preferably, the welding rod fixing pipe air window and the hot air pipe air window are both in a regular shape.

Preferably, the window shapes of the welding rod fixing tube air window and the hot air tube air window are parallel elongated holes or round holes with the angle of 0-90 degrees, and the distance between adjacent air holes is not less than the pipe diameter of the pipe body where 1/8 air holes are located.

According to a further technical scheme, the heat conducting component is a dense-tooth-shaped heat conducting sheet, the upper end of the heat conducting component is closed, and the heat conducting component is made of stainless steel materials, aluminum alloy materials, copper materials or C/C composite materials.

According to a further technical scheme, the air window of the hot air pipe is reduced in diameter corresponding to the side pipe body to form a hot air compression pipe section, the pipe diameter reduction range is 1/10 phi-1/4 phi, and the phi is the pipe diameter of the hot air pipe.

In the application, the welding rod preheating section can transfer wind power and heat to enable the welding rod fixing tube to have a certain micro positive pressure.

According to the further technical scheme, the bottom of the welding nozzle on the same side with the hot air pipe is a floor cloth preheating pipe section, and the floor cloth preheating pipe section is provided with a floor cloth preheating air window and a diameter-reducing air outlet which are perpendicular to the ground.

Preferably, the window of the floor cloth preheating louver vertical to the ground is in the shape of a 0-degree or 90-degree parallel elongated hole, the distance between adjacent air holes is not less than 1/8 phi, and the phi is the diameter of the hot air pipe.

Preferably, the diameter-reduced air outlet is adjacent to the floor cloth preheating air window, the caliber range is 1/5 phi-1/3 phi, phi is the caliber of the hot air pipe, and the included angle between the cross section of the air outlet and the ground is 15-75 degrees.

According to the further technical scheme, the connection position of the floor cloth preheating air window and the pipe body on the inner side of the outlet of the welding rod fixing pipe is provided with an inwards concave air distributing structure, so that hot air is distributed.

In a second aspect, a welding gun is disclosed, wherein the welding gun comprises the welding nozzle, the hot air pipe is provided with a bar-shaped clamping groove, and the hot air pipe is fixed on the welding nozzle through the bar-shaped clamping groove.

In a third aspect, a method of operating a welding gun is disclosed, comprising:

starting a heating power switch, gradually adjusting a heating temperature gear from low to high to a temperature gear required by welding construction, and keeping the temperature for a certain time at the construction temperature until the temperature of hot air at the outlet of a welding rod fixing pipe is basically stable;

guiding welding rods into the welding rod fixing pipe, horizontally moving a welding gun at a constant speed along the direction of a welding seam, and applying downward pressure to the welding rods through a welding rod extrusion plate to uniformly press the welding rods in a viscous state into the welding seam of the floor cloth;

and after welding, cutting off redundant welding rods, adjusting the heating temperature to the lowest, and after blowing for several minutes, turning off the power supply after all the components are cooled.

Compared with the prior art, the invention has the beneficial effects that:

in the technical scheme, because the welding rod preheating section exists, wind power and heat can be enabled to have good transferability between the two pipe body non-connecting sections, the welding rod is fully preheated, the welding rod is helped to reach an ideal viscous state at a lower heating temperature, and the defects of insufficient fluidity of the welding rod or burning and coking of the welding rod and scalding of the seam edge of the floor cloth caused by hot melting temperature deviation can be effectively avoided, so that the construction quality is ensured.

The technical scheme can realize the instant continuous operation of dust removal, water vapor removal, preheating treatment and hot-melt welding of the welding seam of the floor cloth which cannot be finished by the traditional welding nozzle, can realize the operation at a higher speed, removes the independent air blowing treatment process before welding, saves labor force and heat energy output, and improves the construction efficiency.

The two-section preheating of the technical scheme can ensure that the welding seam of the floor cloth is dry and clean, and the welding seam has certain heat before the welding rod welds the welding seam, so that the welding seam is favorable for keeping a good flowing state of the viscous state welding rod in the seam, the welding seam of the floor cloth is fully filled, the maximum effective welding area is obtained, and the welding seam has higher welding strength.

Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.

FIG. 1 is a schematic plan view of an embodiment of the present disclosure;

fig. 2 is a three-dimensional view (top, left, and front) of a dense-teeth-type thermally conductive sheet in an example of the present disclosure.

In fig. 1: 1-welding rod fixing tube, 2-welding rod fixing tube air window, 3-tube body corner clamping cover plate, 4-welding rod extruding plate, 5-concave air distributing structure, 6-hot air tube, 7-strip-shaped clamping groove, 8-heat conducting fin pull ring, 9-dense tooth type heat conducting fin, 10-hot air compression tube section, 11-hot air tube air window, 12-floor cloth preheating air window and 13-necking air outlet.

The specific implementation mode is as follows:

the invention is further described with reference to the following figures and examples.

It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, 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 belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

Therefore, in order to meet the requirements of the existing vehicles and users, the passenger interface environment and the normal overhaul period of the vehicles are ensured, and the improvement of the efficiency and the quality of the floor cloth welding construction is the central importance of the built-in work of the rail vehicles.

Aiming at the problems of serious heat loss, welding rod hot melting deviation and unsatisfactory welding pretreatment effect in the welding process of the floor cloth of the railway vehicle, the invention discloses a quick welding nozzle of a welding gun for the floor cloth of the railway vehicle, aiming at improving the welding construction quality of the floor cloth and reducing the welding fault rate of the floor cloth in the later operation process of the vehicle. The fast welding nozzle of the welding gun for the floor cloth of the railway vehicle can fully utilize heat energy, improve the welding construction efficiency and quality, and further improve the welding seam fusion strength of the floor cloth, thereby reducing the welding failure rate, and ensuring the requirements of the internal environment of the vehicle and the normal operation and maintenance period.

The first embodiment is as follows:

in the present embodiment, the description is given by way of example, but it is not intended to represent that the rapid welding tip provided by the present invention is only applicable to a floor cloth of a railway vehicle. The method can also be applied to other welding guns according to different welding scenes or welding objects.

The most central technical characteristics of the rapid welding nozzle of the welding gun for the floor cloth of the railway vehicle in the embodiment of the disclosure are as follows: a welding rod preheating section and a floor cloth preheating section;

the welding rod preheating section is composed of a heat conducting part, a sealing cover plate and a non-communicated pipe section of an included angle between two pipe bodies, and is mainly used for preheating cold welding rods in the welding rod fixing pipe, so that the welding rods are fully preheated, the ideal viscous state can be achieved at a lower heating temperature in the subsequent hot melting process of the welding rods, and the problems of insufficient hot melting fluidity of the welding rods or scalding of the seam edges of floor cloth and burning of the welding rods caused by hot melting temperature deviation are effectively solved.

The floor cloth preheating section is positioned at the bottom of the welding nozzle on the same side with the hot air pipe and is provided with a floor cloth preheating air window and a reducing air outlet which are vertical to the ground, and after hot air is distributed by the concave air distribution structure, part of air flows out of the floor cloth preheating air window and the reducing air outlet, so that the two-section floor cloth preheating effect is achieved. In addition, the floor cloth has certain heat, so that the viscous state welding rod can keep a good flowing state in the gap.

In a specific embodiment, as shown in fig. 1 and 2, a rapid welding tip for a welding gun for a floor cloth of a railway vehicle comprises a welding rod fixing tube, a hot air tube, a tube body corner clamping sealing cover plate, a dense-tooth-shaped heat conducting strip and a floor cloth preheating tube section, wherein a heat conducting strip pull ring is arranged on the dense-tooth-shaped heat conducting strip, and the heat conducting strip pull ring 8 is used for pulling out a heat conducting grid piece when a heat conducting part is cleaned or replaced. The heat conducting fin pull ring 8 and the dense-tooth-shaped heat conducting fin 9 are of an integral structure, and the upper end of the grid sheet is sealed.

Wherein, two non-connecting pipe section both sides that form the contained angle between welding rod fixed tube 1 and the hot-blast main 6 have the closing cap board 3, and the closing cap board carries out partial closing cap to two body non-intercommunication sections and forms the closing cap region, and two bodys all have regular shape transoms in the closing cap region, are welding rod fixed tube transom 2 and hot-blast main transom 11 respectively.

The space in the sealing cover area can be provided with a dense-tooth-shaped heat conducting fin 9 with the upper end closed, and the included angle between the dense-tooth-shaped heat conducting fin 9 and the sealing cover plate 3 and the two pipe bodies forms a welding rod preheating section.

The hot air pipe louver 11 is reduced corresponding to the side pipe body to form a hot air compression pipe section 10.

The bottom of the welding nozzle on the same side with the hot air pipe 6 is provided with a floor cloth preheating pipe section which is mainly used for preprocessing the welding seam of the floor cloth before welding, the floor cloth preheating pipe is adjacent to the concave air distributing structure on the inner side of the outlet of the welding rod fixing pipe, and the pipe section is provided with a floor cloth preheating air window 12 vertical to the ground and a reducing air outlet 13. The floor cloth preheating ventilation window 12 and the inner side pipe body connecting part of the welding rod fixing pipe 1 outlet are provided with an inward concave air distributing structure 5, so that hot air is distributed. The invention can fully utilize heat energy, improve the welding seam welding strength of the floor cloth and reduce the welding failure rate.

In order to better understand the technical solution of the present application, the detailed structure of the specific components therein will be described, referring again to fig. 1, the cover plate is a thin sheet or thin plate structure made of the same material as the nozzle body tube, and the shape may be a ladder shape, and when it needs to be described, the shape may also be selected according to the actual requirement, and two sheets are fixed on two sides of the non-connection tube section forming the included angle between the welding rod fixing tube and the hot air tube, respectively, and the non-connection tube section forming the included angle between the welding rod fixing tube and the hot air tube has three openings in the three directions, which are perpendicular to the two directions of the outside and the inside of the paper surface and parallel to the paper surface. The downward direction of the parallel paper surface is an included angle of two pipes, and the parallel paper surface is closed but not opened, and the air leakage perpendicular to the two opening directions of the paper surface at the non-connection pipe section is sealed, at the moment, the upward direction of the parallel paper surface is not sealed by a sealing cover plate, and the direction can be sealed after the heat conduction component with the closed upper end is installed, so that an almost completely closed space is formed.

The description of the cover portion being partly covered with respect to a complete closure is explained in detail as follows: one is as follows: the cover sealing plate only seals the leakage in two opening directions perpendicular to the paper surface at the non-connection pipe section, and the upward direction of the parallel paper surface is not sealed by the cover sealing plate; the second step is as follows: in the length direction of the two pipe bodies of the welding rod fixing pipe and the hot air pipe, the cover sealing plate does not completely cover the length of the two pipe bodies, but only covers the part of the length of the non-connection pipe section.

In addition, it should be further explained that, in the present embodiment, it is preferable to adopt a regular shape for the louver shape, because: first the regular shape can guarantee that the transmission of air current and heat is even stable in the direction and intensity, is favorable to the technology to implement stable operation, and second is in the welding implementation in-process, and the crimping welding rod needs perpendicular ground to exert certain power downwards and acts on the welding nozzle body, and regular shape transom can be better dispersed pressure relatively, has certain benefit to the structure protection and the life of welding nozzle. If the louvers are irregular in shape, local heat or stress concentrations may result, increasing vulnerability of the component structure and shortening the useful life.

In one embodiment, the welding rod fixing tube, the hot air tube, the tube body corner sealing cover plate and the floor cloth preheating pipe section are all made of heat-resistant and corrosion-resistant stainless steel.

In one embodiment, the welding rod fixes the air window of the pipe and the air window of the hot air pipe, the window shape is 0-90 degree parallel elongated hole (d no more than 1/8 phi) or round hole (r no more than 1/4 phi), the distance between the adjacent air holes is not less than 1/8 phi (note that phi is the pipe diameter of the pipe body where the air holes are located). Preferably, the two tube body air window windows are in the shape of 45-degree parallel elongated holes (d is 1/8 phi), and the distance between the adjacent air holes is 1/6 phi.

The air window of the hot air pipe is reduced in diameter corresponding to the pipe body on the side to form a hot air compression pipe section, and the pipe diameter reduction range is 1/10-1/4 phi (note that phi is the pipe diameter of the hot air pipe). Preferably, the pipe diameter of the hot gas compression pipe section is reduced by 1/5 phi.

The window shape of the floor cloth preheating air window vertical to the ground is 0 DEG or 90 DEG parallel elongated hole (d is no more than 1/4 phi), and the distance between adjacent air holes is not less than 1/8 phi (note that phi is the pipe diameter of the hot air pipe). Preferably, the window shape of the floor cloth preheating louver is 0 degree (namely, perpendicular to the welding seam direction), the parallel elongated hole (d is 1/6 phi), and the distance between the adjacent air holes is 1/6 phi.

The diameter-reduced air outlet is adjacent to the preheating air window of the floor cloth, the caliber range is 1/5 phi-1/3 phi (note that phi is the diameter of the hot air pipe), and the included angle between the section of the air outlet and the ground is 15-75 degrees. Preferably, the caliber of the reducing air outlet is 1/4 phi, and the included angle between the cross section of the air outlet and the ground is 45-60 degrees.

In the above embodiment, for the shape and size limitation of two tube body air windows, wherein, the limitation of air window size and distance between adjacent air holes is because bar-shaped elongated hole and round hole are convenient to process, in addition, the more important factor considered in the technology is that the above-mentioned shape, size and distance are relatively more effective in transferring air flow and heat, and simultaneously can also make the tube body bearing thermal structure furthest remain.

In one embodiment, the upper end of the close-toothed heat-conducting plate is closed and is made of stainless steel, aluminum alloy, copper material or C/C composite material. Preferably, the dense-tooth-shaped heat conducting fin is made of an aluminum alloy material.

The specific working principle of the rapid welding nozzle of the welding gun for the floor cloth of the railway vehicle is as follows: the concave air distribution structure can distribute hot air blown from the hot air compression pipe section, and part of wind power and heat flow to the vicinity of the outlet of the welding rod fixing pipe and are intersected with the preheated welding rod to heat and melt the welding rod to a viscous state; the other part of wind power and heat flow into the floor cloth preheating pipe section, and are discharged out of the pipe body through the floor cloth preheating air window and the reducing air outlet, and the welding seam is pretreated. The diameter-reduced air outlet can compress hot air to a certain extent, so that the outlet pressure of the air outlet is obviously increased, the air speed of the air outlet is increased, and an included angle is formed between the section of the air outlet and the ground, so that horizontal and vertical wind distribution force can be synchronously provided. The actions can effectively remove dust and impurity particles existing in the welding seam of the floor cloth and absorb moisture on the surface, and meanwhile, primary preheating treatment can be carried out on the welding seam. The preheating ventilation window of the floor cloth can provide hot air vertical to the ground, the wind power is relatively moderate, and the ventilation window is connected with the reducing air outlet to perform strengthening preheating treatment on the welding seam of the floor cloth.

Example II

The embodiment discloses a welding gun, wherein, welding gun includes above-mentioned welding nozzle, the hot-blast main has seted up the bar draw-in groove, fixes the hot-blast main on welding gun nozzle through the bar draw-in groove.

When the welding gun is used as the rapid welding nozzle of the welding gun for the floor cloth of the railway vehicle, in a specific embodiment, the nozzle, the filter screen, the rapid welding nozzle and the dense-tooth-type heat conducting strip are firstly cleaned before use, so that all parts are dry, dustless and free of oil stains. The dense tooth type heat conducting fins 9 are pressed into the space sealed by the pipe body corner clamping sealing cover plate 3, and then the hot blast pipe 6 is fixed on the nozzle of the welding gun through the strip-shaped clamping grooves 7.

The working principle of the invention is as follows: after the welding gun is started, hot air enters the welding tip from the hot air pipe 6, and the hot air compression pipe section 10 is provided with the pipe body necking, so that after the hot air is compressed by the hot air compression pipe section 10, a small part of wind power can enter the area where the dense-tooth-shaped heat conducting fins 9 are located through the hot air pipe air window 11 and contact with the dense-tooth-shaped heat conducting fins, and then enters the welding rod fixing pipe through the welding rod fixing pipe air window, the dense-tooth-shaped heat conducting fins 9 have good transferability to the wind power and the heat energy, the wind power and the heat energy can be guided to the welding rod fixing pipe air window 2 and then enter the welding rod fixing pipe 1, and the welding rods are fully preheated, so that the subsequent welding rod hot melting process is facilitated, the problem of welding rod hot melting deviation caused by low or high heating temperature can be effectively avoided, meanwhile, the micro positive pressure in the welding rod. Most hot air continues to go down along the hot air compression pipe section 10 until the welding rod fixing pipe 1 and the hot air pipe 6 penetrate through the cavity, and is shunted after the connection part of the pipe body at the bottom of the welding tip is contacted with the concave air distribution structure 5. Wherein, the hot air flowing to the outlet of the welding rod fixing tube 1 is intersected with the preheated welding rod, the welding rod can be melted to viscous state, the plastic welding rod is pressed and formed by the welding rod extrusion plate 4, and the welding seam is filled; the hot air flowing into the preheating section of the floor cloth is discharged out of the pipe body through the preheating air window 12 and the reducing air outlet 13 of the floor cloth, and the continuous treatment of dust removal, water vapor removal and two-section preheating can be carried out on the welding seam of the floor cloth.

In an embodiment, a method for operating the welding gun is disclosed, which specifically includes:

after confirming that all parts are tightly installed, ventilating, then starting a heating power switch, slowly and gradually adjusting a heating temperature gear from low to high to a temperature gear required by welding construction, keeping the temperature for 3-5 minutes at the construction temperature until the temperature of hot air at the outlet of the welding rod fixing pipe 1 is basically stable, and the floating range is-5 ℃. The welding rod is led into the welding rod fixing tube 1, the welding gun is horizontally moved at a constant speed along the direction of the welding seam, meanwhile, downward pressure is applied to the welding rod through the welding rod extrusion plate 4, and the welding rod in the viscous state is uniformly pressed into the welding seam of the floor cloth. And after welding, cutting off redundant welding rods, adjusting the heating temperature to the lowest, and after blowing for several minutes, turning off the power supply after all the components are cooled.

The welding rod preheating section is arranged, the wind power and the heat have good transferability between the hot air pipe and the welding rod fixing pipe, the welding rod can be fully preheated, the welding rod can reach an ideal viscous state at a lower heating temperature, and therefore welding is conducted on a welding seam of the floor cloth, and scalding and burning coking of the welding rod at the edge of the floor cloth caused by insufficient hot melt fluidity or high temperature of the welding rod due to low heating temperature can be effectively avoided. Meanwhile, the transmission of wind power and heat in the preheating section of the welding rod can enable the welding rod fixing tube to have certain micro-positive pressure, has an active effect on eliminating the hot air recoil phenomenon of the welding rod fixing tube, and is beneficial to smooth construction and protection of operators.

The existence of this disclosed technical scheme ground plate cloth preheating pipe section has both guaranteed that the welding seam is dry clean, can make the welding seam have certain heat before the butt fusion again, and this is favorable to viscous state welding rod to keep good mobile state in the gap to fully fill up the welding seam, obtain the biggest effective weld area.

In a specific embodiment, the air window form of the welding rod preheating section, the dense-tooth heat conducting sheet material, the air window of the floor cloth preheating section, the necking air outlet form and the like can be changed to influence the flow of air and heat, so that the construction process conditions are controlled to adapt to different welding conditions and the like.

The welding gun containing the welding nozzle in the disclosed embodiment is applied to the field of railway vehicle interior decoration and applied to the process of heat welding of vehicle floor cloth. The paving of the rail vehicle floor cloth belongs to a special process, but is not limited to the welding of the rail vehicle floor cloth, and the application possibility exists in all scenes requiring plastic or rubber fusion heat welding, such as floor surfaces of factory workshops and office areas.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.