阅读说明：本技术 一种双层冷却管内管的制造装置及其工艺 (Manufacturing device and process of inner pipe of double-layer cooling pipe ) 是由 叶胡根 张静 于 2021-07-06 设计创作，主要内容包括：本发明公开了一种双层冷却管内管的制造装置及其工艺,装置主要包括磁棒、管坯、龙门架、横梁、导轨、预热电极、焊接电极、补热电极、挤压辊和红外相机等。龙门架的数量为二,并通过横梁连接,横梁上设有三组导轨,三组导轨上依次安装有预热电极、焊接电极和补热电极,横梁下方为待焊接管坯,管坯内部同轴安装有磁棒,管坯V点两侧对称安装有挤压辊,V点上方设有红外相机(固定在龙门架上)。工艺的具体步骤为：首先通过预热电极对管坯坡口进行预热,然后通过焊接电极加热和补热电极补热使管坯不同壁厚的焊接点温度均达到焊接温度,完成焊接工序。本发明有效解决了变壁厚管材焊接时极易发生冷焊或过烧等焊接缺陷,提高了变壁厚管材的焊接质量。(The invention discloses a device and a process for manufacturing an inner pipe of a double-layer cooling pipe. The device comprises portal frames, a welding electrode, a preheating electrode, a welding electrode, a heat-supplementing electrode, a magnetic rod, extrusion rollers and an infrared camera, wherein the portal frames are two in number and are connected through a cross beam, three groups of guide rails are arranged on the cross beam, the preheating electrode, the welding electrode and the heat-supplementing electrode are sequentially arranged on the three groups of guide rails, a tube blank to be welded is arranged below the cross beam, the magnetic rod is coaxially arranged in the tube blank, the extrusion rollers are symmetrically arranged on two sides of a V point of the tube blank, and the infrared camera (fixed on the portal frames) is arranged above the V point. The process comprises the following specific steps: preheating the groove of the tube blank by a preheating electrode, and then heating the welding point of the tube blank with different wall thicknesses to reach the welding temperature by a welding electrode and a heat supplementing electrode to supplement heat so as to finish the welding process. The invention effectively solves the welding defects of cold welding or overburning and the like which are easily generated when the variable wall thickness pipe is welded, and improves the welding quality of the variable wall thickness pipe.)

1. The device for manufacturing the inner pipe of the double-layer cooling pipe mainly comprises a magnetic bar (1), a pipe blank (2), a portal frame (3), a cross beam (4), a first guide rail (5), an electrode (6), an extrusion roller (7), an infrared camera (8), a console (9) and the like, it is characterized in that the number of the portal frames (3) is two, and the portal frames are connected through the cross beam (4), three groups of first guide rails (5) are arranged on the cross beam (4), the electrodes (6) are arranged on the first guide rails (5) of each group in a sliding way, the tube blank (2) is arranged below the cross beam (4), the magnetic rod (1) is coaxially arranged in the tube blank (2), install pipe (2) V point both sides squeeze roll (7), pipe (2) V point top is equipped with infrared camera (8), in addition, this device still is equipped with control cabinet (9).

2. The manufacturing device of the double-layer cooling pipe inner pipe according to claim 1, wherein the electrode (6) comprises a preheating electrode (61), a welding electrode (62) and a heat-supplementing electrode (63), the preheating electrode (61), the welding electrode (62) and the heat-supplementing electrode (63) are identical in structure and mainly comprise a translation table (64), a lifting arm (65), a horizontal adjusting mechanism (66) and a single electrode (67), the translation table (64) is slidably mounted on the first guide rail (5) on the cross beam (4), the lifting arm (65) is slidably mounted on the translation table (64), the horizontal adjusting mechanism (66) is fixedly connected to the lower end of the lifting arm (65), and each horizontal adjusting mechanism (66) comprises two single electrodes (67).

3. The manufacturing device of the double-layer cooling pipe inner pipe according to claim 1, wherein the horizontal adjusting mechanism (66) mainly comprises a bottom plate, a motor (660), a motor mounting seat (661), a coupler (662), a screw rod seat (663), a second guide rail (664), a first screw rod (665), a slider (666), a driving block (667), a mounting platform (668) and a second screw rod (669), the bottom plate is fixedly connected with the lower end of the lifting arm (65), the motor mounting seat (661) is fixedly mounted at one end of the bottom plate, the motor (660) is mounted on the motor mounting seat (661), the output shaft of the motor (660) is connected with the first end of the first screw rod (665) through the coupler (662), the second end of the first screw rod (665) is connected with the first end of the second screw rod (669) through the coupler (662), first lead screw (665) with second lead screw (669) screw thread turns to opposite, first end, the second end of first lead screw (665) with second lead screw (669) first end, second end all are equipped with lead screw seat (663) support, lead screw seat (663) is installed on the bottom plate, first lead screw (665) with second lead screw (669) both sides are equipped with second guide rail (664), slidable mounting is gone up in second guide rail (664) slider (666), first lead screw (665) with all install on second lead screw (669) drive block (667), slider (666) with install on drive block (667) mounting platform (668), install on mounting platform (668) single electrode (67).

4. The manufacturing device of the double-layer cooling pipe inner pipe according to claim 1, wherein the single electrode (67) mainly comprises a mounting shaft (670), a telescopic shaft (678), a pressing sheet (671), a first spring (672), a baffle plate (673), a connecting piece (674), an electrode base (679), a mounting nut (675), a second spring (676), a sub-electrode (677) and the like, the single electrode (67) is mounted on the mounting platform (668) through the mounting shaft (670), the telescopic shaft (678) is coaxially mounted inside the mounting shaft (670), the pressing sheet (671), the first spring (672) and the baffle plate (673) are coaxially mounted between the mounting shaft (670) and the telescopic shaft (678) in turn, and the lower end of the telescopic shaft (678) is connected with the electrode base (679) through the connecting piece (674), the electrode holder (679) is provided with m rows and n columns of the sub-electrodes (677), and each sub-electrode (677) is provided with the second spring (676) and the mounting nut (675).

5. The process for manufacturing an inner tube of a double-walled cooling tube according to any one of claims 1 to 4, comprising the steps of:

s1, forming the tube blank (2);

s2, preheating:

s21, adjusting the height of the lifting arm (65) according to the specification of the tube blank (2) to ensure that the lower surface of the electrode (6) is in close contact with the wave trough area of the outer surface of the tube blank (2);

s22, preheating the edge of the groove of the tube blank (2) through a preheating electrode (61), and collecting the temperature of the edge of the groove of the tube blank (2);

s221, if the temperature of the edge of the groove of the tube blank (2) is lower than 100 ℃, improving the heating power of the preheating electrode (61) or reducing the distance between the preheating electrode (61) and the V point;

s222, if the temperature of the edge of the groove of the tube blank (2) is higher than 100 ℃ and lower than 200 ℃, keeping the heating power and the position parameters of the preheating electrode (61) unchanged, and finishing the subsequent groove preheating process;

s3, welding:

s31, heating the groove through the welding electrode (62), and adjusting the heating power or position parameters of the welding electrode (62) by taking the area with the thinnest wall thickness (namely when the wall thickness of the V point) of the tube blank (2) as the reference to enable the temperature of the V point to reach the range of 1350 ℃ to 1450 ℃;

s32, calculating the wall thickness of the tube blank (2) at the V point in real time through a console (9), and simultaneously acquiring the temperature of the V point in real time through an infrared camera (8);

s33, along with the increase of the wall thickness of the V-point tube blank (2), the groove is subjected to heat compensation through a heat compensation electrode (63), so that the welding temperature of the V-point at different wall thicknesses reaches more than 1350 ℃ and does not exceed 1450 ℃;

s34, the console (9) automatically learns the adjustment programs of the electrical parameters and the position parameters of the electrode (6), and completes the automatic matching of the wall thickness of the V point of the tube blank (2) and the welding parameters;

and S4, finishing the welding process and performing post-welding treatment.

Technical Field

The invention relates to the field of welded pipe manufacturing, in particular to a manufacturing device and a manufacturing process of an inner pipe of a double-layer cooling pipe.

Background

The double-layer cooling pipe is a double-layer pipeline formed by sleeving one or more inner pipes on an outer pipe, generally, the outer pipe is a light pipe, and the inner pipe is a high-efficiency heat exchange pipe provided with a plurality of fins or with continuously-changed wall thickness (the inner surface and/or the outer surface is provided with bulges or grooves, so that the flow rate of fluid is accelerated, and the heat exchange area is increased at the same time). On one hand, if the inner pipe is suddenly broken in the service process, the outer pipe can continue to work, so that enough rush repair time is reserved, and the economic loss is greatly reduced; on the other hand, the double-layer pipeline can ensure that the fluid in the outer pipe and the fluid in the inner pipe are not mixed, and is applied to cooling the environment-polluted fluid. At present, for pipes with constantly changing wall thickness, small-caliber pipes can be manufactured by drawing and expanding or powder metallurgy and other processes, but large-caliber pipes are only suitable for being manufactured by welding processes due to the manufacturing cost or technical limit. However, because the wall thickness is constantly changed, the welding defects such as cold welding at the thick wall or overburning at the thin wall are easily caused by adopting the existing welding technology, and the welding quality is seriously influenced. Therefore, the device and the process for welding the variable-wall-thickness pipe with high quality have important engineering practical significance.

Disclosure of Invention

The invention mainly aims to overcome at least one defect in the prior art, and provides a manufacturing device and a manufacturing process of a double-layer cooling pipe inner pipe, which are used for solving the welding defects of cold welding at a thick wall part, overburning at a thin wall part and the like in the welding process of a variable-wall-thickness pipe and improving the welding quality of the variable-wall-thickness pipe.

The purpose of the invention is realized by the following technical scheme: manufacturing installation of double-deck cooling tube inner tube, it mainly includes bar magnet, pipe, portal frame, crossbeam, first guide rail, electrode, squeeze roll, infrared camera and control cabinet etc, the quantity of portal frame is two, and passes through the crossbeam is connected, be equipped with three groups on the crossbeam first guide rail, every group slidable mounting has on the first guide rail the electrode, the crossbeam below does the pipe, the inside coaxial arrangement of pipe has the bar magnet, pipe V point both sides are installed the squeeze roll, pipe V point top is equipped with infrared camera (fixing on the portal frame), in addition, this device still is equipped with the control cabinet.

Preferably, the electrode comprises a preheating electrode, a welding electrode and a heat supplementing electrode, the preheating electrode, the welding electrode and the heat supplementing electrode are consistent in structure and mainly comprise a translation table, a lifting arm, a horizontal adjusting mechanism and a single electrode, the translation table is slidably mounted on the first guide rail on the cross beam, the lifting arm is slidably mounted on the translation table, the lower end of the lifting arm is fixedly connected with the horizontal adjusting mechanism, and each horizontal adjusting mechanism comprises two single electrodes.

Preferably, the horizontal adjusting mechanism mainly comprises a bottom plate, a motor mounting seat, a coupler, a screw rod seat, a second guide rail, a first screw rod, a slider, a driving block, a mounting platform and a second screw rod, the bottom plate is fixedly connected with the lower end of the lifting arm, the motor mounting seat is fixedly mounted at one end of the bottom plate, the motor is mounted on the motor mounting seat, a motor output shaft is connected with the first end of the first screw rod through the coupler, the second end of the first screw rod is connected with the first end of the second screw rod through the coupler, the screw thread turning directions of the first screw rod and the second screw rod are opposite, the first end and the second end of the first screw rod and the first end and the second end of the second screw rod are supported by the screw rod seat, the screw rod seat is mounted on the bottom plate, and the second guide rail is arranged on two sides of the first screw rod and the second screw rod, the sliding block is arranged on the second guide rail in a sliding mode, the driving block is arranged on the first lead screw and the second lead screw, the mounting platform is arranged on the sliding block and the driving block, and the single electrode is arranged on the mounting platform.

Preferably, the single electrode mainly includes installation axle, telescopic shaft, compressing blade, first spring, separation blade, connecting piece, electrode holder, mounting nut, second spring and sub-electrode etc., the single electrode passes through the installation axle is installed on the mounting platform, the inside coaxial arrangement of installation axle has the telescopic shaft, the installation axle with coaxial arrangement has in proper order between the telescopic shaft the compressing blade first spring with the separation blade, the telescopic shaft lower extreme passes through the connecting piece is connected the electrode holder, install the row of m n on the electrode holder and be listed as sub-electrode, every install on the sub-electrode the second spring with mounting nut.

The invention also provides a manufacturing process of the inner pipe of the double-layer cooling pipe, which comprises the following steps:

s1, forming a tube blank;

s2, preheating:

s21, adjusting the height of the lifting arm according to the specification of the tube blank to ensure that the lower surface of the electrode is in close contact with the wave trough area of the outer surface of the tube blank;

s22, preheating the edge of the groove of the tube blank through a preheating electrode, and collecting the temperature of the edge of the groove of the tube blank;

s221, if the temperature of the edge of the groove of the tube blank is lower than 100 ℃, improving the heating power of the preheating electrode or reducing the distance between the preheating electrode and the V point;

s222, if the temperature of the edge of the groove of the tube blank is higher than 100 ℃ and lower than 200 ℃, keeping the heating power and the position parameters of the preheating electrode unchanged, and finishing the subsequent groove preheating process;

s3, welding:

s31, heating the groove through the welding electrode, and enabling the temperature of the V point to reach 1350-1450 ℃ by adjusting the heating power or position parameters of the welding electrode with the area with the thinnest wall thickness of the tube blank (namely when the wall thickness of the V point is thinnest) as a reference;

s32, calculating the wall thickness of the tube blank at the V point in real time through a console, and acquiring the temperature of the V point in real time through an infrared camera;

s33, along with the increase of the wall thickness of the V-point tube blank, performing heat supplement on the groove through a heat supplement electrode, so that the welding temperature of the V-point at different wall thicknesses reaches more than 1350 ℃ and does not exceed 1450 ℃;

s34, automatically learning an electrode electrical parameter and position parameter adjusting program by a console, and completing automatic matching of the wall thickness of the V point of the tube blank and the welding parameter;

and S4, finishing the welding process and performing post-welding treatment.

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

1. the inner pipe of the double-layer cooling pipe is manufactured by high-frequency contact welding, the groove of the pipe blank is preheated by the preheating electrode, and then the welding point temperatures of different wall thicknesses of the pipe blank reach the welding temperature by the heating of the welding electrode and the heat supplementing of the heat supplementing electrode, so that the welding defects of cold welding, overburning and the like which are easy to occur during the welding of the pipe with variable wall thickness are effectively overcome;

2. the high-frequency welding contactor (namely the electrode) is composed of m rows and n columns of sub-electrodes, the contactor can be better suitable for workpieces with uneven surfaces, the contact area between the contactor and the surfaces of the workpieces is ensured, and the welding stability is improved; secondly, a damping mechanism is arranged on the high-frequency contactor, so that the abrasion of the high-frequency contactor is reduced while the welding stability is ensured, and the service life of the high-frequency contactor is prolonged;

3. the invention improves the welding quality and the welding automation degree of the variable wall thickness pipe, reduces the influence of human factors on the welding quality, ensures the stability of the welding quality and improves the production efficiency; in addition, the invention can be used for high-frequency contact welding of common welded pipes or corrugated pipes and other variable-diameter pipes.

Drawings

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

FIG. 1 is a flow chart of the manufacturing process of the inner tube of the double-layer cooling tube of the present invention;

FIG. 2 is a front view of an apparatus for manufacturing an inner tube of a double-walled cooling tube according to the present invention;

FIG. 3 is a plan view of an apparatus for manufacturing an inner tube of a double-walled cooling tube according to the present invention;

FIG. 4 is a partial view of an apparatus for manufacturing an inner tube of a double-walled cooling tube according to the present invention;

FIG. 5 is a schematic view of a horizontal adjustment mechanism of a device for manufacturing an inner tube of a double-layer cooling tube according to the present invention;

FIG. 6 is a schematic diagram showing a single electrode structure of an apparatus for manufacturing an inner tube of a double-layered cooling tube according to the present invention;

FIG. 7 is a schematic view showing the axial locus of the extrusion roller of the apparatus for manufacturing the inner tube of the double-walled cooling tube of the present invention;

reference numbers in the figures: 1. a magnetic bar; 2. a pipe blank; 3. a gantry; 4. a cross beam; 5. a first guide rail;

6. an electrode; 61. preheating an electrode; 62. welding an electrode; 63. a heat-compensating electrode; 64. a translation stage; 65. a lifting arm;

66. a horizontal adjustment mechanism; 660. a motor; 661. a motor mounting seat; 662. a coupling; 663. a screw base; 664. a second guide rail; 665. a first lead screw; 666. a slider; 667. a drive block; 668. mounting a platform; 669. a second lead screw;

67. a single electrode; 670. installing a shaft; 671. a compression sheet; 672. a first spring; 673. a baffle plate; 674. a connecting member; 675. mounting a nut; 676. a second spring; 677. a sub-electrode; 678. a telescopic shaft; 679. an electrode holder;

7. a squeeze roll; 8. an infrared camera; 9. a console; 10. squeeze roll axis trajectory.

Detailed Description

The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.

Manufacturing installation of double-deck cooling tube inner tube, as shown in fig. 2 and 3, it includes bar magnet 1, pipe 2, portal frame 3, crossbeam 4, first guide rail 5, electrode 6, squeeze roll 7, infrared camera 8 and control cabinet 9 etc, the quantity of portal frame 3 is two, and connect through crossbeam 4, be equipped with three first guide rail 5 of group (quantity is six) on crossbeam 4, slidable mounting has electrode 6 on every first guide rail 5 of group, crossbeam 4 below is pipe 2, the inside coaxial arrangement of pipe 2 has bar magnet 1, squeeze roll 7 is installed to V point both sides, V point top is equipped with infrared camera 8 (fixed on portal frame 3), in addition, this device still is equipped with control cabinet 9.

As shown in fig. 4, the electrode 6 includes a preheating electrode 61, a welding electrode 62 and a heat-supplementing electrode 63, the preheating electrode 61, the welding electrode 62 and the heat-supplementing electrode 63 are identical in structure and mainly composed of a translation stage 64, a lifting arm 65, a horizontal adjusting mechanism 66 and a single electrode 67, the translation stage 64 is slidably mounted on the first guide rail 5 on the cross beam 4, the lifting arm 65 is slidably mounted on the translation stage 64, the horizontal adjusting mechanism 66 is fixedly connected to the lower end of the lifting arm 65, and each horizontal adjusting mechanism 66 includes two single electrodes 67.

As shown in fig. 5, the horizontal adjustment mechanism 66 mainly includes a bottom plate, a motor 660, a motor mounting base 661, a coupling 662, a screw base 663, a second guide rail 664, a first screw 665, a slider 666, a driving block 667, a mounting platform 668 and a second screw 669, the bottom plate is fixedly connected to the lower end of the lifting arm 65, the motor mounting base 661 is fixedly mounted at one end of the bottom plate, the motor 660 is mounted on the motor mounting base 661, an output shaft of the motor 660 is connected to a first end of the first screw 665 through the coupling 662, a second end of the first screw 665 is connected to a first end of the second screw 669 through the coupling 662, the screw directions of the first screw 665 and the second screw 669 are opposite, the first end, the second end of the first screw 665 and the second screw 669 are respectively provided with a screw base 663 for supporting, the screw base 663 is mounted on the bottom plate, the second guide rail 664 is arranged at two sides of the first screw 665 and the second screw 669, the slider 666 is slidably mounted on the second guide rail 664, a driving block 667 is arranged on each of the first lead screw 665 and the second lead screw 669, a mounting platform 668 is arranged on each of the sliding block 666 and the driving block 667, and a single electrode 67 is arranged on each mounting platform 668.

As shown in fig. 6, the single electrode 67 mainly includes a mounting shaft 670, a telescopic shaft 678, a pressing sheet 671, a first spring 672, a stopper 673, a connecting member 674, an electrode holder 679, a mounting nut 675, a second spring 676, a sub-electrode 677, etc., the single electrode 67 is mounted on the mounting platform 668 through the mounting shaft 670, the telescopic shaft 678 is coaxially mounted inside the mounting shaft 670, the pressing sheet 671, the first spring 672 and the stopper 673 are coaxially mounted between the mounting shaft 670 and the telescopic shaft 678 in sequence, the lower end of the telescopic shaft 678 is connected with the electrode holder 679 through the connecting member 674, 9 rows and 7 columns of sub-electrodes 677 are mounted on the electrode holder 679, and the second spring 676 and the mounting nut 675 are mounted on each sub-electrode 677.

In a preferred embodiment of the present invention, the manufacturing process of the inner tube of the double-layer cooling tube, as shown in fig. 1, comprises the following steps:

s1, forming the tube blank 2;

s2, preheating:

s21, adjusting the height of the lifting arm 65 according to the specification of the tube blank 2 to ensure that the lower surface of the electrode 6 is in close contact with the wave trough area of the outer surface of the tube blank 2;

s22, preheating the edge of the groove of the tube blank 2 through the preheating electrode 61, and collecting the temperature of the edge of the groove of the tube blank 2;

s221, if the temperature of the edge of the groove of the tube blank 2 is lower than 100 ℃, improving the heating power of the preheating electrode 61 or reducing the distance between the preheating electrode 61 and a V point;

s222, if the edge temperature of the groove of the tube blank 2 is higher than 100 ℃ and lower than 200 ℃ and meets the preheating temperature, keeping the heating power and the position parameters of the preheating electrode 61 unchanged, and finishing the subsequent groove preheating process;

s3, welding:

s31, heating the groove through the welding electrode 62, and adjusting the heating power or position parameter of the welding electrode 62 by taking the thinnest wall thickness of the V point as a reference to enable the temperature of the V point to reach 1350 ℃ or above and not to exceed 1450 ℃;

s32, calculating the wall thickness of the tube blank 2 at the V point in real time through the console 9, and simultaneously acquiring the temperature of the V point in real time through the infrared camera 8;

s33, along with the increase of the wall thickness of the V point, the groove is subjected to heat supplementing through the heat supplementing electrode 63, so that the welding temperature of the V point at different wall thicknesses reaches more than 1350 ℃ and does not exceed 1450 ℃;

s34, the console 9 automatically learns the adjustment program of the electrical parameters and the position parameters of the electrode 6 and completes the automatic matching of the wall thickness at the V point and the welding parameters;

and S4, finishing the welding process and performing post-welding treatment.

In actual production, the squeeze rolls 7 are fixed in the axial direction of the tube blank 2, and the tube blank 2 advances at a constant speed, but for clarity, in this embodiment, assuming that the tube blank 2 is fixed, the squeeze rolls 7 retreat at a constant speed in the axial direction of the tube blank 2, so as to satisfy the relative movement between the tube blank 2 and the squeeze rolls 7, based on the above, when the wall thickness at the V point is different, the rolling reduction of the squeeze rolls 7 is also different, and the axial movement locus of the squeeze rolls 7 is as shown in fig. 7.

The principle and the implementation mode of the invention are explained by applying a specific example, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.