CN117863572A - Welding equipment for double-layer pipe and welding process thereof - Google Patents

Abstract

The invention discloses welding equipment and welding technology for double-layer pipes, and belongs to the technical field of double-layer pipe production. After the double-layer sheet material is wound into a double-layer pipe, a gap to be sealed is reserved in the double-layer pipe; according to the advancing direction of the double-layer pipe, the welding device sequentially comprises an inner layer welding device and a first outer layer welding device. The invention rolls up the double-layer sheet into the double-layer pipe through the existing equipment, welds the inner layer welding strip at the inner side of the gap by utilizing the inner layer welding device, welds the first outer layer welding strip at the outer side of the gap by utilizing the first outer layer welding device to finally form the double-layer pipe, and then welds by utilizing the second outer layer welding device to cover the welding mark welded by the first outer layer welding rod, thereby maintaining good sealing performance.

Description

Welding equipment for double-layer pipe and welding process thereof

Technical Field

The invention relates to welding equipment for double-layer pipes and a welding process thereof, and belongs to the technical field of double-layer pipe production.

Background

At present, in the field of hose production, a pipeline sleeving manner is generally adopted at present, namely an outer pipe is directly sleeved outside an inner pipe, the applicant proposes that a manner of firstly stacking double-layer sheets and then rolling the double-layer sheets into a pipe and then welding the double-layer sheets is adopted for manufacturing the double-layer pipe, wherein in the prior art, only a single-layer hose is stacked and then rolled into the pipe and then welding the double-layer pipe is adopted for manufacturing the double-layer pipe, wherein: the method for welding the double-layer sheet material after being rolled into the pipe material does not exist at present, and in the prior art, either the pipe material is selected or the sheet material is selected, and no mode for sealing the corresponding pipe material after the sheet material is rolled into the pipe material exists.

Disclosure of Invention

The invention provides welding equipment and a welding process for double-layer pipes, which solve the problem that in the prior art, welding is not performed after double-layer sheets are rolled into pipes.

The technical problems to be solved by the invention are realized by adopting the following technical scheme:

the double-layer pipe is welded by using welding equipment, and after the double-layer sheet material is wound into the double-layer pipe, a gap to be sealed is reserved in the double-layer pipe;

according to the advancing direction of the double-layer pipe, the welding device sequentially comprises an inner layer welding device and a first outer layer welding device; the inner layer welding device is used for welding inner layer materials of the double-layer pipe, sealing off the inner side of the gap, and the first outer layer welding device is used for welding outer layer materials of the double-layer pipe, sealing off the outer side of the gap.

As a preferred example, the welding apparatus further includes a second outer layer welding device for welding the hose outer layer material and covering the welding mark of the first outer layer welding device on the hose outer layer material to function as a seal welding mark.

As a preferable example, the inner layer welding device, the first outer layer welding device and the second outer layer welding device jointly form a production line platform, a traction device is arranged at the tail end of the production line platform, and is positioned behind the second outer layer welding device according to the advancing direction of the double-layer pipe and used for dragging the double-layer pipe to sequentially pass through the inner layer welding device, the first outer layer welding device, the second outer layer welding device and the traction device, so that a hose sequentially carries out inner layer welding operation, first outer layer welding operation and second outer layer welding operation through the conveying of the production line.

As a preferable example, the inner layer welding device, the first outer layer welding device and the second outer layer welding device are separately provided; after being used for welding the inner layer of the double-layer pipe through the inner layer welding device, the double-layer pipe is transferred to the first outer layer welding device for first welding operation and then transferred to the second outer layer welding device for second welding operation.

As a preferred example, the inner layer welding device comprises a first support and a first frame, wherein the top of the inner part of the first support is connected with the first frame through a first lifting assembly, a first air blower is respectively arranged in the first frame, a hot air gun is further arranged on the first frame through a second lifting assembly, a welding rod limiting part, a first air nozzle and a first pinch roller assembly are sequentially arranged at the outer bottom of the first frame along the advancing direction of a hose, the output end of the first air blower is communicated with the hot air gun through a ventilation hose, and the outlet end of the hot air gun extends out of the first frame and is communicated with the first air nozzle for sequentially limiting the welding rod, adsorbing the welding rod to a gap positioned on the inner layer, welding the welding rod by hot melting and compacting when the hose is used for inner layer welding.

Further, the first lifting component comprises a first air cylinder, the fixed end of the first air cylinder is fixed at the top end of the first bracket, the output end of the first air cylinder is fixed at the top end of the first frame, guide rods are arranged on the first bracket and the first frame, the installation direction of the guide rods on the first bracket is consistent with the movement direction of the output end of the first air cylinder and used for driving the first air cylinder to lift, so that the first frame lifts in the first bracket, and the welding rod limiting part, the first tuyere and the first pinch roller component which are positioned at the bottom of the first frame lift respectively, thereby meeting the welding rod requirements of inner layers with different thicknesses or meeting the hose requirements with different thicknesses;

the second lifting assembly is a first linear guide rail, the fixed end of the first linear guide rail is fixed on the first frame, and the movable end of the first linear guide rail is arranged on the hot air gun and used for driving the hot air gun to move up and down so as to enable the first tuyere to move up and down, thereby meeting the requirements of welding rods with inner layers with different thicknesses or meeting the requirements of hoses with different thicknesses;

the first pinch roller assembly comprises a first pinch roller, a telescopic column and a spring, one end of the telescopic column is installed on the first frame, the first pinch roller is installed on the telescopic column, one end of the spring is connected with the bottom of the first frame, the other end of the spring is sleeved on a support provided with the first pinch roller, the bottom of the first pinch roller on the support stretches out of the support and is used for stretching out and drawing back the telescopic column relative to the first frame through stretching out and drawing back of the spring, so that the first pinch roller moves up and down relative to a hose, and the purpose of pressing welding spots after welding is achieved.

In order to achieve the firmness of the first frame fixed on the first bracket, the side wall of the first bracket is also arranged on the first frame through a connecting piece; in addition, in order to better realize welding of the inner layer materials, a first limiting block used for limiting the hose is further arranged on the first bracket.

As a preferred example, the first outer welding device includes second support, second frame, the inside top of second support is through third lifting assembly and second frame connection, the inside of second support still installs first outer welding rod unloading cylinder through the link, and along the direction of advance of double-deck tubular product, and first outer welding rod unloading cylinder is located the rear side of second frame, the second air-blower is installed respectively to the inside of second frame, still install the second tuyere through fourth lifting assembly on the second frame, the second pinch roller is still installed through the fifth lifting assembly to the outer bottom of second frame, still install the third pinch roller through the axle on the second support, just the bottom of second pinch roller corresponds with the top of third pinch roller, just the output of second air-blower is linked together through ventilation hose and second tuyere for make the hose carry out first outer welding, compress tightly the operation in proper order when carrying out first outer welding.

Further, the third lifting assembly comprises a second air cylinder, the fixed end of the second air cylinder is fixed at the top end of the second support, the output end of the second air cylinder is fixed at the top end of the second frame, guide rods are also arranged on the second support and the second frame, the installation direction of the guide rods on the second support is consistent with the movement direction of the output end of the second air cylinder, and the guide rods are used for driving the second air cylinder to lift, so that the second frame lifts in the second support, and the second air nozzle and the second pinch roller assembly at the bottom of the second frame lift respectively, thereby meeting the requirements of welding first outer welding rods with different thicknesses or meeting the requirements of hoses with different thicknesses;

the fourth lifting assembly is a second linear guide rail, the fixed end of the second linear guide rail is fixed on the second frame, and the movable end of the second linear guide rail is arranged on the second tuyere and used for driving the second tuyere to move up and down, so that the requirements of welding first outer welding rods with different thicknesses or the requirements of hose with different thicknesses are met;

the fifth lifting assembly is a third linear guide rail, the fixed end of the third linear guide rail is fixed on the second frame, the movable end of the third linear guide rail is installed on a connecting piece where the second pressing wheel is located, the bottom of the second pressing wheel extends out of the connecting piece where the second pressing wheel is located and corresponds to the top of the third pressing wheel, and a hose passes between the second pressing wheel and the third pressing wheel and is used for lifting the movable end of the third linear guide rail, so that a bracket where the second pressing wheel is located moves up and down relative to the second frame and corresponds to the third pressing wheel, the second pressing wheel moves up and down relative to the hose and is matched with the third pressing wheel, and the purpose of pressing welding points after welding is achieved.

In order to achieve the firmness of the second frame fixed on the second bracket, the side wall of the second bracket is also arranged on the second frame through a connecting piece; in addition, in order to better realize the welding of the first outer layer material, a second limiting block for limiting the hose is further arranged on the second bracket.

The structural composition of the second outer layer welding device is the same as that of the first layer resin welding device.

As a preferred example, the traction device comprises a third bracket, a third cylinder is mounted on the third bracket, the output end of the third cylinder is connected with a mounting frame, a first driving wheel is rotatably connected on the mounting frame, a connecting frame is connected on the third bracket, a second driving wheel is mounted on the connecting frame, the bottom of the first driving wheel is close to the second driving wheel, and a hose is driven by the bottom of the first driving wheel and the second driving wheel relatively to walk between the first driving wheel and the second driving wheel.

The welding process of the double-layer hose comprises the following steps:

step 1, reserving a gap on a double-layer pipe, and placing an inner layer welding rod on an inner layer material through the gap;

step 2, utilizing an inner layer welding device to absorb and then thermally melt an inner layer welding rod, so that the inner layer welding rod welds an inner layer material to block the inner side of the gap, and the material of the inner layer welding rod is the same as that of the inner layer material; using a first outer layer welding device to melt a first outer layer welding rod in a hot mode, enabling the first outer layer welding rod to weld an outer layer material so as to seal the outer side of the gap, wherein the material of the first outer layer welding rod is the same as that of the outer layer material; and (3) using a second outer layer welding device to thermally melt a second outer layer welding rod, so that the second outer layer welding rod is used for welding resin and covering welding marks on an outer layer material by the first outer layer welding rod, wherein the material of the second outer layer welding rod is the same as that of the outer layer material.

And (2) sequentially carrying out the welding operation of the inner layer welding rod, the first outer layer welding rod and the second outer layer welding rod on a hose with a length under the traction of a conveying and traction device of a production line until the welding operation of the hose with the length is completed.

As a preferred example, in step 2, welding is performed in the following manner:

in step 2, welding is performed in the following manner:

step 2.1, moving a double-layer pipe with a gap on a production line along with the traction of a traction device, after the double-layer pipe reaches the traction device from an inner layer welding device, a first outer layer welding device and a second outer layer welding device, respectively lowering a first air nozzle and a first pinch roller assembly on the inner layer welding device in place through the cooperation of a first lifting assembly, adjusting the position of a hot air gun through a second lifting assembly, starting a first air blower, enabling the hot air gun and the first air nozzle to work sequentially, driving a second pinch roller assembly on the first outer layer welding device in place through a third lifting assembly, driving a second air nozzle into place through a fourth lifting assembly, starting a second air blower, enabling the second air nozzle to start working, and limiting an inner layer welding rod through a welding rod limiting piece;

step 2.2, enabling the hose to pass through the first air nozzle, enabling air to pass through the ventilation pipe and the hot air gun and then to be discharged from the first air nozzle, enabling the first air nozzle to absorb an inner layer welding rod positioned at the bottom of the inner layer to be below a gap along with lifting of the second lifting assembly, and enabling the inner layer welding rod to be welded with an inner layer material by utilizing the first air nozzle through the gap;

step 2.3, along with the traction of the traction device, the double-layer pipe outside the unwelded off-seam moves on a production line, the double-layer pipe passes through a second air nozzle, and the second air blower blows air, so that the air passes through the ventilation pipe and then flows out of the second air nozzle to melt the first outer layer welding rod in a hot mode, and the first outer layer welding rod and the outer layer material are welded;

step 2.4, along with the traction of the traction device, welding by the first outer layer welding device and then welding by the second outer layer welding device.

Further, the gap deviation between the first tuyere and the inner side of the gap on the double-layer pipe is 1-2mm, the temperature at the first tuyere is 300-350 ℃, and the flash melting temperature is 300-350 ℃; the pressure of the first pinch roller is 25-35Kgf, the distance between the bottom of the first tuyere and the upper surface of the inner layer welding rod is 1-2mm, and the distance between the first tuyere and the edge of the first pinch roller is 5-15mm; the pressure of the second pressing wheel on the first outer layer welding device is 20-25Kgf, the temperature of the second air nozzle on the first outer layer welding device is 300-350 ℃, the distance between the center of the second air nozzle on the first outer layer welding device and the first outer layer welding rod is 3-5mm, the first outer layer welding rod on the first outer layer welding device is tightly attached to the second pressing wheel, the second pressing wheel presses a hose, and the deviation of a welding seam is 1-3mm between the first outer layer welding rod and a gap outside a gap on a double-layer pipe.

As a preferred example, in step 2.5, the welding is repeated according to step 2.4 and the weld mark of the first outer electrode on the outer layer material is covered to function as a seal weld mark.

Further, the pressure of the second pressing wheel on the second outer layer welding device is 26-35Kgf, the temperature of the second air nozzle on the second outer layer welding device is 330-380 ℃, the distance between the center of the second air nozzle on the second outer layer welding device and the second outer layer welding rod is 4-8mm, the second outer layer welding rod on the second outer layer welding device is tightly attached to the second pressing wheel, the second pressing wheel presses a hose, and the deviation of the second outer layer welding rod and a gap outside the double-layer pipe, namely a welding seam, is 1-3mm.

As a preferred example, an inner layer material is flash-welded using an inner layer welding device to form an inner layer weld mark, and the inner layer weld mark is pressed or compacted using the first pinch roller assembly;

welding an outer layer material by adopting a first outer layer welding device to form a first outer layer welding mark, and pressing down or compacting the inner layer welding mark and the first outer layer welding mark by utilizing a second pinch roller assembly;

and adopting a second outer welding device to thermally melt a second outer welding rod to form a second outer welding mark, covering the first outer welding mark by the second outer welding mark, and finally compacting the three-layer welding mark by using a second pinch roller assembly positioned on the second outer welding device to form a double-layer hose which is totally closed along the axial direction of the double-layer pipe.

As a preferred example, the width of the first outer electrode is 20-40mm and the width of the second outer electrode is 50-70mm.

Further, the width of the first outer electrode is 40mm and the width of the second outer electrode is 60mm.

As a preferred example, the traction means traction in the following way:

the double-layer pipe passes through a gap between the second pressing wheel and the third pressing wheel, the second pressing wheel and the third pressing wheel compact welding spots formed after welding and melting the first outer layer welding rod and the first outer layer material of the outer layer, and the hose after the first outer layer welding operation is completed is conveyed.

The beneficial effects of the invention are as follows: the invention rolls up the double-layer sheet into the double-layer pipe through the existing equipment, the inner layer welding strip is welded on the inner side of the off-seam by utilizing the inner layer welding device, the first outer layer welding strip is welded on the outer side of the off-seam by utilizing the first outer layer welding device, the double-layer pipe is finally formed, the double-layer pipe is welded by utilizing the second outer layer welding device and covers the welding mark welded by the first outer layer welding rod, and good sealing performance is kept.

Drawings

FIG. 1 is a schematic diagram of an overall production line involved in a welding process according to the present invention;

FIG. 2 is a schematic structural view of a welding device for the terylene mesh nonwoven fabric in the integral production line of FIG. 1;

FIG. 3 is a schematic view of the portion A in FIG. 2;

FIG. 4 is a schematic diagram of a first PE welding device in the overall assembly line of FIG. 1;

FIG. 5 is a schematic view of the portion B in FIG. 4;

FIG. 6 is a schematic diagram of the structure of the traction device in the whole production line of the present invention;

FIG. 7 is a graph showing the effect of the nonwoven fabric with the net woven by terylene in the invention after being welded;

FIG. 8 is a graph showing the effect of the welding of the polyester screening non-woven fabric, the first PE and the second PE;

in the figure: a production line platform 1; a terylene net non-woven fabric welding device 2; a first bracket 201; a first cylinder 202; a first frame 203; a first blower 204; a first linear guide 205; a heat gun 206; a first puck 207; a first tuyere 208; a first stopper 209; a welding rod limiting member 210; a spring 211; a first layer PE welding device 3, a second bracket 301; a second cylinder 302; a second frame 303; a second linear guide 304; a third linear guide 305; a first PE electrode blanking roller 306; a second blower 307; a second puck 308; a second tuyere 309; a third puck 310; a second layer PE welding device 4; a traction device 5; a third bracket 501; a third cylinder 502; a second drive wheel 503; a first drive wheel 504, a polyester screened non-woven fabric welding rod 6; a hose 7; a first PE electrode 8; a second PE electrode 9.

Detailed Description

The invention will be further described with reference to specific drawings and examples in order to provide a better understanding of the technical means, the creation characteristics, the achievement of the objects and the effects of the invention.

The double-layer pipe adopted in the invention is formed by rolling double-layer sheets into a pipe, sequentially superposing two sheets with different materials and the same width, namely, firstly placing one sheet, then placing the sheet with the other material above the sheet, but the two sheets with the same or different widths, then, under the traction of traction equipment on a production line, folding the double-layer sheet into the double-layer pipe by the double-layer sheet, welding the inner side and the outer side of a gap by using inner layer welding equipment and first outer layer welding equipment, then welding the outer layer of the gap by using second outer layer welding equipment, and plugging the welding mark of the first outer layer welding equipment at the outer side of the gap so as to ensure the tightness of the welding mark, and finally, preparing the double-layer pipe.

That is, as shown in fig. 1 to 8, the welding equipment for double-layer pipe production comprises a terylene nonwoven fabric welding device 2 (comprising a first bracket 201 and a first frame 203), wherein the top of the inside of the first bracket 201 is respectively lifted by a first lifting component (the first lifting component comprises a first air cylinder 202, the fixed end of the first air cylinder 202 is fixed at the top end of the first bracket 201, the output end of the first air cylinder 202 is fixed at the top end of the first frame 203, guide rods are respectively arranged on the first bracket 201 and the first frame 203, the installation direction of the guide rods on the first bracket 201 is consistent with the movement direction of the output end of the first air cylinder 202, the lifting component is used for driving the lifting of the first air cylinder 202, so that the first frame 203 is lifted in the first bracket 201, and the welding rod limiting part 210, the first air nozzle 208 and the first pressing wheel component which are positioned at the bottom of the first frame 203 are respectively lifted, thereby meeting the welding rod 6 requirements of different thickness of terylene nonwoven fabric, or meeting the requirements of different thickness hoses 7, a first frame 203 is respectively installed inside the first frame 203, a first frame 204 is respectively installed on the first frame 205, the upper end 205 is also installed on the upper end 206 and lower end 206 of the first air nozzle 208 is also installed on the first end of the welding rod which is not welded with the same thickness of the first air nozzle 7, the welding rod is installed on the first end of the first frame 208, the welding rod is continuously along the upper end of the first end 206, and the welding rod is not welded, the upper end of the welding rod is fixed on the first end of the welding rod is connected with the welding rod, and the welding rod is connected with the welding rod, and the welding rod is in the welding rod, and the welding rod is connected, the first pinch roller assembly (the first pinch roller assembly comprises a first pinch roller 207, a telescopic column and a spring 211, one end of the telescopic column is installed on the first frame 203, the first pinch roller 207 is installed on the telescopic column, one end of the spring 211 is connected with the bottom of the first frame 203, the other end of the spring 211 is sleeved on a bracket provided with the first pinch roller 207, the bottom of the first pinch roller 207 on the bracket stretches out of the bracket and is used for stretching the telescopic column relative to the first frame 203 through stretching of the spring 211 so as to enable the first pinch roller 207 to move up and down relative to the hose 7, thereby achieving the purpose of pressing welding spots after welding), and the output end of the first blower 204 is communicated with the hot air gun 206 through a ventilation hose, the output end of the hot air gun 206 stretches out of the first frame 203 and is communicated with the first air nozzle 208 and is used for sequentially carrying out welding rod limiting, welding rod welding and pressing operation when the hose 7 is welded with polyester non-woven cloth, and in addition, the first frame 201 is provided with a connecting piece on the side wall of the first frame 201 for achieving the firmness of fixing the first frame 203 on the first frame 201; in addition, in order to better realize the welding of the terylene mesh non-woven fabrics, a first limiting block 209 for limiting the hose 7 is also arranged on the first bracket 201;

the first layer PE welding device 3 (the first layer PE welding device 3 comprises a second bracket 301 and a second frame 303, the top of the interior of the second bracket 301 is provided with a third lifting component (the third lifting component comprises a second air cylinder 302, the fixed end of the second air cylinder 302 is fixed at the top end of the second bracket 301, the output end of the second air cylinder 302 is fixed at the top end of the second frame 303, guide rods are also arranged on the second bracket 301 and the second frame 303, the installation direction of the guide rods on the second bracket 301 is consistent with the movement direction of the output end of the second air cylinder 302, and the guide rods are used for driving the second air cylinder 302 to lift, so that the second frame 303 performs lifting movement in the second bracket 301, and the second air nozzle 309 and the second pinch roller component which are positioned at the bottom of the second frame 303 are respectively lifted, thereby meeting the requirements of welding the first PE welding rods with different thicknesses or meeting the requirements of the hose 7 with different thicknesses), the second bracket 301 is internally provided with a first PE welding rod blanking roller 306 through a connecting frame, the first PE welding rod blanking roller 306 is positioned at the rear side of the second frame 303 along the advancing direction of the hose 7, the second frames 303 are internally provided with second blowers 307 respectively, the second frame 303 is also provided with a second air nozzle 309 through a fourth lifting component (the fourth lifting component is a second linear guide rail 304), the fixed end of the second linear guide rail 304 is fixed on the second frame 303, the movable end of the second linear guide rail 304 is arranged on a second air nozzle 309 for driving the second air nozzle 309 to move up and down, thereby meeting the requirements of welding the first PE welding rods with different thicknesses or meeting the requirements of the hose 7 with different thicknesses), the outer bottom of the second frame 303 is further provided with a second pressing wheel 308 through a fifth lifting assembly (the fifth lifting assembly is a third linear guide rail 305, the fixed end of the third linear guide rail 305 is fixed on the second frame 303, the movable end of the third linear guide rail 305 is arranged on a connecting piece where the second pressing wheel 308 is positioned, the bottom of the second pressing wheel 308 extends out of the connecting piece where the bottom of the second pressing wheel is positioned and corresponds to the top of the third pressing wheel 310, a hose 7 passes between the second pressing wheel 308 and the third pressing wheel 310 and is used for lifting the movable end of the third linear guide rail 305, so that a bracket where the second pressing wheel 308 is positioned moves up and down relative to the second frame 303 and corresponds to the third pressing wheel 310, the second pressing wheel 308 moves up and down relative to the hose 7 and is matched with the third pressing wheel 310, the purpose of pressing welding spots after welding is achieved), the second pressing wheel 308 is also arranged on the second bracket through a shaft, the bottom of the second pressing wheel 308 corresponds to the top of the third pressing wheel 310, and the output end of the second blower 307 is communicated with the second air nozzle 309 through a ventilation hose for enabling the hose to be used for welding a nonwoven fabric to be sequentially welded and a PE (PE) during welding operation;

the second layer of PE welding device 4 (the structural composition of the second layer of PE welding device 4 is the same as that of the first layer of PE welding device 3, and the second layer of PE welding device 4 is used for welding PE on the outer layer of the hose 7 and covers welding marks of the first layer of PE welding device 2 on PE on the outer layer of the hose 7 so as to play a role of sealing the welding marks) together form the production line platform 1;

the welding device further comprises a traction device 5 (comprising a third bracket 501, a third cylinder 502 is arranged on the third bracket 501, the output end of the third cylinder 502 is connected with a mounting frame, a first driving wheel 504 is rotatably connected to the mounting frame, a connecting frame is connected to the third bracket 501, a second driving wheel 503 is arranged on the connecting frame, the bottom of the first driving wheel 504 is close to the second driving wheel 503, the hose 7 walks between the first driving wheel 504 and the second driving wheel 503 under the relative driving of the bottom of the first driving wheel 504 and the second driving wheel 503), the inner layer is made of polyester nonwoven fabrics with net, the outer layer is made of PE, the traction device 5 is positioned behind the second layer PE welding device 4, the hose 7 is sequentially connected with the polyester nonwoven fabrics welding device 2, the first layer PE welding device 3, the second layer PE welding device 4 and the traction device 5, the hose 7 is sequentially subjected to the polyester nonwoven fabrics welding operation through the conveying of a production line, the first layer PE welding operation and the second PE welding operation (the first layer PE welding operation is required to be realized by the fact that the second frame 303 is fixed on the second bracket 301, the second frame 301 is required to be firmly welded on the second side wall 301, the same layer is also required to be welded with the second bracket 301, and the second frame 301 is further arranged on the second side wall is required to be welded with the second layer 301, and the same structure is formed by welding device is also required to be welded with the second frame 301).

Before formal welding, all pinch rollers (a first pinch roller and a second pinch roller), a first tuyere and welding rod limiting parts are in place, raw materials pass through an inner layer welding device, a first outer layer welding device and a second outer layer welding device in sequence through the traction devices, are compressed by the first pinch roller and the second pinch roller, are formally welded, firstly, a blower for welding a first polyester non-woven fabric welding rod is started, wind enters a hot air gun, then the wind exits from the first tuyere, and after the wind reaches a proper temperature (350 ℃), the traction devices drive hoses to move forward, and the second tuyere positioned on the first outer layer welding device moves to a proper position; the second tuyere, which is located immediately above the second outer welding device, is also moved to a suitable position, so far that all the welding actions are completed, and the welding of hundreds of meters of raw material is continued.

The welding process for producing the double-layer pipe comprises the following steps of:

step 1, a release joint is reserved on a hose 7 with an inner layer of terylene mesh non-woven fabric and an outer layer of PE, and a terylene mesh non-woven fabric welding rod 6 is placed on the inner layer of terylene mesh non-woven fabric through the release joint;

step 2, firstly adsorbing and then flash-melting a terylene mesh non-woven fabric welding rod 6 by using a terylene mesh non-woven fabric welding device 2, welding the terylene mesh non-woven fabric by using the terylene mesh non-woven fabric welding rod 6 to seal the inner side of the gap, and hot-melting a first PE welding rod 8 by using a first PE welding device 3 to weld a PE material by using the first PE welding rod 8 to seal the outer side of the gap; the second PE welding device 4 is utilized to heat-melt the second PE welding rod 9, so that the second PE welding rod 9 welds PE material and covers welding marks on the PE material by the first PE welding rod 8, namely:

step 2.1, along with the traction of the traction device 5, the double-layer pipe 7 with the off-joint moves on a production line, after the double-layer pipe reaches the traction device 5 from the terylene mesh non-woven fabric welding device 2, the first PE welding device 3 and the second PE welding device 4, the first air nozzle 208 and the first pinch roller component on the terylene mesh non-woven fabric welding device 2 are respectively matched with the first lifting component to be in place, the position of the hot air gun 206 is adjusted through the second lifting component, the first air blower 204 is started, the hot air gun 206 and the first air nozzle 208 work in sequence, the second pinch roller component on the first PE welding device 3 is driven into place by the third lifting component, the second air nozzle 309 is driven into place by the fourth lifting component, the second air blower 307 is started, the second air nozzle 309 starts to work, and the welding rod limiting piece 210 limits welding rods on the inner layer;

step 2.2, the double-layer pipe 7 passes through a first air nozzle, the gap deviation between the first air nozzle and the inner side of a gap on the double-layer pipe 7 is 2mm, air passes through a ventilation pipe and a hot air gun and then flows out of the first air nozzle 208, the temperature at the first air nozzle is 330 ℃ along with the lifting of a second lifting assembly, a polyester screened non-woven fabric welding rod positioned at the bottom of an inner layer is adsorbed below the gap, and the first air nozzle 208 is utilized to melt the polyester screened non-woven fabric welding rod 6 and the polyester screened non-woven fabric of the inner layer through the gap;

step 2.3, the double-layer pipe 7 passes through a gap between the first pinch roller assembly and the production line, the first pinch roller 207 compacts welding spots formed after welding and melting the terylene mesh non-woven fabric welding rod 6 and the terylene mesh non-woven fabric of the inner layer under the assistance of the spring 211, the pressure of the first pinch roller is 30Kgf, the distance between the first tuyere 208 and the edge of the first pinch roller 207 is 10mm, namely the inner side of the gap is welded firmly;

step 2.4, along with the traction of the traction device 5, the double-layer pipe 7 outside the unwelded off-seam moves on a production line, the double-layer pipe 7 passes through a second tuyere 309, the second blower 309 blows air, the air passes through the ventilation pipe and then exits from the second tuyere 309, the first PE welding rod 8 is hot-melted, and the first PE welding rod 8 and the outer layer material are welded;

step 2.5, the double-layer pipe 7 outside the gap subjected to the first outer layer welding moves on a production line, the second PE welding rod 9 is hot-melted by the first PE welding device 3, PE is welded by the second PE welding rod 9, and a welding mark on the outer layer PE by the first PE welding rod 8 is covered, so that the effect of sealing the welding mark is achieved, the pressure of a second pressing wheel 308 positioned on the first PE welding device 4 is 30Kgf, the temperature of a second air nozzle 309 positioned on the first PE welding device 4 is 360 ℃, the distance between the center of the second air nozzle 309 positioned on the first PE welding device 4 and the second PE welding rod 9 is 5mm, the second PE welding rod 9 is tightly attached to the second pressing wheel 308, the second pressing wheel 308 tightly presses the double-layer pipe 7, the gap outside the gap between the second PE welding rod 9 and the double-layer pipe 7 is 3mm, namely, the welding seam deviation is 60mm;

step 2.6, sequentially passing through the step 2, and sequentially carrying out welding operation of the terylene screened non-woven fabric welding rod 6, welding of the first PE welding rod 8 and welding operation of the second PE welding rod 9 on the double-layer pipe 7 with one length under the traction of the conveying and traction device 5 of the production line until the welding operation of the double-layer pipe 7 with one length is completed.

Welding an inner layer material in a flash melting mode by adopting an inner layer welding device to form an inner layer welding mark, and pressing down or compacting the inner layer welding mark by utilizing a first pinch roller assembly;

welding an outer layer material by adopting a first outer layer welding device to form a first outer layer welding mark, and pressing down or compacting the inner layer welding mark and the first outer layer welding mark by utilizing a second pinch roller assembly;

and adopting a second outer welding device to thermally melt a second outer welding rod to form a second outer welding mark, covering the first outer welding mark by the second outer welding mark, and finally compacting the three-layer welding mark by using a second pinch roller assembly positioned on the second outer welding device to form a double-layer hose which is totally closed along the axial direction of the double-layer pipe.

The traction device 5 is used for traction in the following manner: the double-layer pipe 5 sequentially passes through the polyester screening non-woven fabric welding device 2, the first PE welding device 3 and the second PE welding device 4, (it is to be noted that before welding is started, the first time passes through the first PE welding device 3 and the second PE welding device 4, but a hose welded by the polyester screening non-woven fabric welding device 2 is required to be removed, and the double-layer pipe 7 welded by the polyester screening non-woven fabric welding device 2, the first PE welding device and the second PE welding device is only useful; the double-layer pipe 7 passes through a gap between the second driving wheel 502 and the third driving wheel 504, the second pressing wheel 308 and the third pressing wheel 310 compact welding spots formed after the first PE welding rod 8 and the first PE of the outer layer are welded and convey a hose after the first PE welding operation is completed, wherein the pressure of the second pressing wheel 308 positioned on the first PE welding device 3 is 24Kgf, the temperature of the second air nozzle 309 positioned on the first PE welding device 3 is 340 ℃, the distance between the center of the second air nozzle 309 positioned on the first PE welding device 3 and the PE welding rod is 4mm, the first PE welding rod 8 is tightly attached to the second pressing wheel 308, the second pressing wheel 308 presses the double-layer pipe 7, the gap outside the first PE welding rod 8 and the double-layer pipe 7 is 3mm, namely the welding seam deviation is 3mm, and the width of the first PE welding rod 8 is 40mm.

The dry hose can also adopt another structure, and the polyester screened non-woven fabric welding device 2, the first PE welding device 3 and the second PE welding device 4 are independently arranged; after the inner layer operation is welded by the polyester screening non-woven fabric welding device 2, the double-layer pipe 7 is transported (the transportation can be carried out manually or mechanically, and the transportation is carried out on the premise that a very long hose (for example, 30 meters) is required to be cut into a small section of length, for example, 5 meters, and the transportation is convenient), the first welding operation is carried out on the first PE welding device 3, and the second welding operation is carried out on the second PE welding device 4.

According to the invention, the dry hose can also have other embodiments, the dry hose can also have another structure, the outer layer of the dry hose adopts TPU, the inner layer of the dry hose adopts terylene screened non-woven fabric sheets, the outer side of the gap is welded by adopting TPU welding rods, and the inner side of the gap is welded by adopting terylene screened non-woven fabric welding rods.

The invention rolls up the double-layer sheet into the double-layer pipe through the existing equipment, the inner layer welding strip is welded on the inner side of the off-seam by utilizing the inner layer welding device, the first outer layer welding strip is welded on the outer side of the off-seam by utilizing the first outer layer welding device, the double-layer pipe is finally formed, the double-layer pipe is welded by utilizing the second outer layer welding device and covers the welding mark welded by the first outer layer welding rod, and good sealing performance is kept.

The foregoing has shown and described the basic principles and main features of the present invention and the advantages of the present invention. It will be appreciated by persons skilled in the art that the present invention is not limited to the embodiments described above, but is capable of numerous variations and modifications without departing from the spirit and scope of the invention as hereinafter claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (10)

1. Welding equipment for double-layer pipes is characterized in that: after the double-layer sheet material is wound into a double-layer pipe, a gap to be sealed is reserved in the double-layer pipe;

according to the advancing direction of the double-layer pipe, the welding device sequentially comprises an inner layer welding device and a first outer layer welding device; the inner layer welding device is used for welding inner layer materials of the double-layer pipe, sealing off the inner side of the gap, and the first outer layer welding device is used for welding outer layer materials of the double-layer pipe, sealing off the outer side of the gap.

2. The welding apparatus of claim 1, wherein: the welding equipment further comprises a second outer layer welding device which is used for welding the outer layer material of the hose and covering welding marks of the first outer layer welding device on the outer layer material of the hose so as to play a role in sealing the welding marks.

3. The welding apparatus of claim 2, wherein: the inner layer welding device, the first outer layer welding device and the second outer layer welding device form a production line platform together, a traction device is arranged at the tail end of the production line platform, and is positioned behind the second outer layer welding device according to the advancing direction of the double-layer pipe, and the traction device is used for dragging the double-layer pipe to sequentially pass through the inner layer welding device, the first outer layer welding device, the second outer layer welding device and the traction device, so that the double-layer pipe sequentially carries out inner layer welding operation, the first outer layer welding operation and the second outer layer welding operation through the conveying of the production line platform.

4. The welding apparatus of claim 2, wherein: the inner layer welding device, the first outer layer welding device and the second outer layer welding device are independently arranged; after being used for welding the inner layer of the double-layer pipe through the inner layer welding device, the double-layer pipe is transferred to the first outer layer welding device for first welding operation and then transferred to the second outer layer welding device for second welding operation.

5. Welding apparatus according to any one of claims 3 or 4, characterized in that: the inner layer welding device comprises a first support and a first frame, wherein the top of the inner part of the first support is connected with the first frame through a first lifting assembly, a first blower is respectively arranged in the first frame, a hot air gun is further arranged on the first frame through a second lifting assembly, along the advancing direction of the double-layer pipe, a welding rod limiting part, a first tuyere and a first pinch roller assembly are sequentially arranged at the outer bottom of the first frame, the output end of the first blower is communicated with the hot air gun through a ventilation hose, and the outlet end of the hot air gun extends out of the first frame and is communicated with the first tuyere for sequentially limiting welding rods, adsorbing the welding rods to the gaps on the inner layer, welding the welding rods by hot melting and compacting when the double-layer pipe is subjected to inner layer welding.

6. Welding apparatus according to any one of claims 3 or 4, characterized in that: the first outer welding device comprises a second support and a second frame, wherein the top of the inside of the second support is connected with the second frame through a third lifting assembly, a first outer welding rod blanking roller is installed in the inside of the second support through a connecting frame and is located at the rear side of the second frame along the advancing direction of the double-layer pipe, a second blower is installed in the inside of the second frame respectively, a second air nozzle is installed on the second frame through a fourth lifting assembly, a second pressing wheel is installed at the outer bottom of the second frame through a fifth lifting assembly, a third pressing wheel is installed on the second support through a shaft, the bottom of the second pressing wheel corresponds to the top of the third pressing wheel, and the output end of the second blower is communicated with the second air nozzle through a ventilation hose and is used for enabling the double-layer pipe to sequentially perform first outer welding and pressing operation when the double-layer pipe is subjected to first outer welding.

7. Welding process for double-layer pipes according to any of claims 1 to 6, characterized in that: the method comprises the following steps:

step 1, reserving a gap on a double-layer pipe, and placing an inner layer welding rod on an inner layer material through the gap;

step 2, utilizing an inner layer welding device to absorb and then thermally melt an inner layer welding rod, so that the inner layer welding rod welds an inner layer material to block the inner side of the gap, and the material of the inner layer welding rod is the same as that of the inner layer material; and (3) utilizing the first outer layer welding device to hot melt the first outer layer welding rod, so that the first outer layer welding rod welds an outer layer material to block the outer side of the gap, and the material of the first outer layer welding rod is the same as the outer layer material.

8. The welding process of claim 7, wherein: in step 2, after the welding of the first outer layer welding rod is finished, the second outer layer welding rod is hot-melted by using the second outer layer welding device, so that the second outer layer welding rod covers the welding mark of the first outer layer welding rod on the outer layer material, and the material of the second outer layer welding rod is the same as the outer layer material.

9. The welding process of claim 8, wherein: in step 2, welding is performed in the following manner:

step 2.1, moving a double-layer pipe with a gap on a production line along with the traction of a traction device, after the double-layer pipe reaches the traction device from an inner layer welding device, a first outer layer welding device and a second outer layer welding device, respectively lowering a first air nozzle and a first pinch roller assembly on the inner layer welding device in place through the cooperation of a first lifting assembly, adjusting the position of a hot air gun through a second lifting assembly, starting a first air blower, enabling the hot air gun and the first air nozzle to work sequentially, driving a second pinch roller assembly on the first outer layer welding device in place through a third lifting assembly, driving a second air nozzle into place through a fourth lifting assembly, starting a second air blower, enabling the second air nozzle to start working, and limiting an inner layer welding rod through a welding rod limiting piece;

step 2.2, enabling the hose to pass through the first air nozzle, enabling air to pass through the ventilation pipe and the hot air gun and then to be discharged from the first air nozzle, enabling the first air nozzle to absorb an inner layer welding rod positioned at the bottom of the inner layer to be below a gap along with lifting of the second lifting assembly, and enabling the inner layer welding rod to be welded with an inner layer material by utilizing the first air nozzle through the gap;

step 2.3, along with the traction of the traction device, the double-layer pipe outside the unwelded off-joint moves to a first outer layer welding device on a production line, the double-layer pipe passes through a second air nozzle, and the second air blower blows air, so that the air passes through the ventilation pipe and then exits from the second air nozzle, and the first outer layer welding rod is melted by hot melting, so that the first outer layer welding rod and the outer layer material are melted by welding;

step 2.4, along with the traction of the traction device, welding by the first outer layer welding device and then welding by the second outer layer welding device.

10. The welding process of claim 8, wherein: welding an inner layer material in a flash melting mode by adopting an inner layer welding device to form an inner layer welding mark, and pressing down or compacting the inner layer welding mark by utilizing a first pinch roller assembly;

welding an outer layer material by adopting a first outer layer welding device to form a first outer layer welding mark, and pressing down or compacting the inner layer welding mark and the first outer layer welding mark by utilizing a second pinch roller assembly;

and adopting a second outer welding device to thermally melt a second outer welding rod to form a second outer welding mark, covering the first outer welding mark by the second outer welding mark, and finally compacting the three-layer welding mark by using a second pinch roller assembly positioned on the second outer welding device to form a double-layer hose which is totally closed along the axial direction of the double-layer pipe.