Method and apparatus for laser welding and sealing of mineral insulated heating cable to power supply wires

Abstract

The present application relates to the technical field of heating cable production, in particular to a mineral insulation heating cable and power line laser welding sealing method and device, wherein the method comprises the steps of welding preparation, welding fixation and welding sealing, and the device comprises a workbench fixed above a cabinet and left and right pneumatic rotary chucks arranged on both sides above the workbench, a tray is mounted on the left pneumatic rotary chuck through a mounting frame, and a wire pressing mechanism for pressing the cable coil on the tray is arranged on the tray. The present application adopts laser welding, avoids the problem of silver solder sheet overheating and falling caused by improper temperature control of silver soldering, reduces the dependence on manual operation, ensures stable welding quality of each welding area through precise energy output, realizes precise positioning of each welding area through the visual positioning assembly and three-axis moving group, avoids the error of manual positioning, ensures complete matching of the laser welding path and the weld, and improves the welding precision.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heating cable production, in particular to a mineral insulated heating cable and power line laser welding sealing method and device. BACKGROUND

[0002] The mineral insulated heating cable is usually composed of a metal sheath, a magnesium oxide filling layer and an internal heating wire. In the production process of the mineral insulated heating cable, the heating cable core wire and the power line are inserted into the metal sheath for welding to realize electrical connection and sealing of the welding position, so as to ensure the electrical performance and protection performance of the cable.

[0003] At present, the commonly used connection and sealing methods are silver welding and argon arc welding. However, these two welding methods have obvious defects. The silver welding process relies on manual operation. During the heating process, due to the low melting point of silver, the silver welding piece is prone to overheating and falling off due to improper temperature control, which affects the welding quality and the reliability of the cable. The argon arc welding method also mainly relies on manual operation. After long-term use, its sealing performance will decrease significantly, which cannot meet the long-term use requirements of the mineral insulated heating cable in terms of waterproofness and dustproofness.

[0004] The visual positioning laser welding technology in the welding field is a precise manufacturing technology combining visual detection and laser welding. The position, contour or weld characteristics of the workpiece are recognized in real time by a visual system (such as an industrial camera and an image algorithm), the welding area is accurately positioned, and then the high energy density characteristics of the laser are used to realize rapid fusion, thereby significantly improving the welding quality.

[0005] Therefore, how to apply the visual positioning laser welding technology to the welding of the core wire and the power line has become a problem that needs to be solved in the field of heating cable production. SUMMARY

[0006] The present application aims to provide a mineral insulated heating cable and power line laser welding sealing method and device to solve the technical problems in the background art.

[0007] To achieve the above-mentioned purpose, the present application provides the following technical solutions.

[0008] A mineral insulated heating cable and power line laser welding sealing method, the metal sheath used in the method includes a circular hollow body, one end of the circular hollow body has a lead-through hole A for matching the power line body to pass through, and the other end has a lead-through hole B for matching the core wire body to pass through;

[0009] The inner diameter of the lead-through hole A is equal to the inner diameter of the circular hollow body, the inner diameter of the lead-through hole B is smaller than the inner diameter of the lead-through hole A, and the circular hollow body has a reserved hole on the outer peripheral wall which communicates with the inner cavity;

[0010] The welding sealing method specifically comprises the following steps:

[0011] Step one, preparation before welding: horizontally position the metal sheath, ensure that the reserved hole faces upwards, pass the power line body and the core line body into the circular hollow body from the lead-through hole A and the lead-through hole B respectively, make the two abut in the circular hollow body, and ensure that the annular welding area A formed at the abutment position corresponds to the reserved hole position;

[0012] Step two, welding fixation: perform laser welding on the annular welding area A;

[0013] perform laser welding on the annular welding area B formed between the power line body and the end wall of the circular hollow body;

[0014] perform laser welding on the annular welding area C formed between the core line body and the end wall of the circular hollow body;

[0015] Step three, welding sealing: translate the power line body and the core line body as a whole to the side of the lead-through hole B, so that the outer wall of the power line body covers the reserved hole, and then perform laser welding on the welding area D formed between the inner port of the reserved hole and the outer wall of the power line body.

[0016] Preferably, the welding at the annular welding area A is spot welding, the welding points are at least four, and are distributed along the annular path, the welding at the annular welding area B is spot welding followed by full welding, the welding at the annular welding area C is spot welding followed by full welding, and the welding at the welding area D is full welding.

[0017] Preferably, a mineral insulation heating cable and power line laser welding sealing device is applied to the mineral insulation heating cable and power line laser welding sealing method, and comprises a workbench fixed above a cabinet and left and right pneumatic rotary chucks arranged above both sides of the workbench. A tray is mounted on the side of the left pneumatic rotary chuck through a mounting frame, and a wire pressing mechanism for pressing the cable on the tray is arranged on the tray. An installation plate is mounted on the workbench through a three-axis moving group, a mounting seat is mounted on the front side of the installation plate through a swing adjusting mechanism, a visual positioning assembly and a laser welding assembly are arranged on the mounting seat, and the swing adjusting mechanism is used to drive the mounting seat to rotate and adjust. The left and right pneumatic rotary chucks are both provided with horizontally extending channels for the power line body and the core line body to pass through respectively, and a positioning mechanism for positioning and placing the circular hollow body is arranged above the workbench between the left and right pneumatic rotary chucks.

[0018] Preferably, the three-axis moving group comprises a power guide rail A, a power guide rail B and a power guide rail C, the power guide rail A is horizontally arranged on the workbench and used for driving the mounting plate to move left and right, the power guide rail B is horizontally arranged on the top of the moving seat A of the power guide rail A and used for driving the mounting plate to move forward and backward, the power guide rail C is vertically arranged on the top of the moving seat B of the power guide rail B and used for driving the mounting plate to move up and down, and the mounting plate is arranged on the moving seat C at the front side of the power guide rail C.

[0019] Preferably, the positioning mechanism comprises a connecting piece and a pair of L-shaped pieces, the connecting piece is arranged above the workbench and between the left pneumatic rotary chuck and the right pneumatic rotary chuck, the two L-shaped pieces are symmetrically fixed on the two sides of the connecting piece, the connecting piece and the vertical parts of the two U-shaped clamping parts form the U-shaped clamping part, and the outer wall of the circular hollow body is provided with an annular groove matched with the U-shaped clamping part.

[0020] Preferably, the swing adjusting mechanism comprises a cylinder seat and a driving device, the cylinder seat is rotationally arranged on the front side surface of the mounting plate, the mounting seat is fixed on the front side end of the cylinder seat, and the driving device is arranged on the mounting plate and used for driving the cylinder seat to rotate and adjust.

[0021] Preferably, three photoelectric sensors are arranged at intervals on the front side surface of the mounting plate and located at the periphery of the cylinder seat, the three photoelectric sensors are distributed around the cylinder seat axis, the top of the mounting seat is fixed with a sensing piece, the sensing piece is respectively inductive cooperation with the three photoelectric sensors, when the sensing piece is in inductive cooperation with the middle photoelectric sensor, the laser welding assembly is used for welding the annular welding area A or the welding area D, when the sensing piece is in inductive cooperation with the left photoelectric sensor, the laser welding assembly is used for welding the annular welding area C, and when the sensing piece is in inductive cooperation with the right photoelectric sensor, the laser welding assembly is used for welding the annular welding area B.

[0022] Preferably, a horizontal translation cylinder extending left and right is fixed on the top of the moving end of the left pneumatic rotary chuck, and the horizontal translation cylinder is used for driving the left pneumatic rotary chuck to move left and right to adjust the distance between the left pneumatic rotary chuck and the right pneumatic rotary chuck.

[0023] Preferably, an open-topped box body is fixed above the workbench, the two L-shaped pieces are respectively fixed on the two side inner walls of the box body, the two sides of the box body are respectively provided with a clearance opening corresponding to the position of the U-shaped clamping part, the front side of the box body is provided with an interface, the interface is connected with the industrial dust collector through a pipeline, a flexible pipe is arranged on the side of the laser welding assembly, and a nozzle is communicatively arranged at the end of the flexible pipe.

[0024] Preferably, the wire pressing mechanism comprises a pressing strip, a driving motor, a threaded rod, a nut sleeve and a traction arm, the driving motor is fixed at the center of the upper surface of the tray, the threaded rod is vertically fixed on the end of the output shaft of the driving motor, the nut sleeve is threadedly matched and sleeved on the threaded rod, the upper surface of the tray is fixed with a surrounding fence distributed around the driving motor, the top end of the surrounding fence is provided with four installation grooves respectively, four pressing strips are hingedly installed in the four installation grooves respectively, the four pressing strips are all provided with sliding long grooves extending along the length direction of the pressing strips, the outer wall of the nut sleeve is uniformly fixed with four downwardly extending inclined traction arms, the ends of the four traction arms are fixed with U-shaped seats respectively, the U-shaped seats are all rotatably installed with limiting rollers, and the limiting rollers are matched with limiting clamps in the sliding long grooves one by one.

[0025] Compared with the prior art, the present application has the following advantages.

[0026] The laser welding assembly is used to replace traditional silver welding and argon arc welding, the laser energy density is concentrated and controllable, the problem of silver welding sheet overheating and falling caused by improper temperature control is avoided, manual operation dependence is reduced, the welding quality of each welding area is ensured to be stable through precise energy output, the visual positioning assembly cooperates with the three-axis moving group to realize accurate positioning of each welding area, the error of manual positioning is avoided, the laser welding path is completely matched with the welding seam, the welding precision is improved, and the sealing protection effect of the circular hollow body on the connection between the power line body and the core line body is ensured.

[0027] The power line body and the core line body are accurately butt-jointed in the circular hollow body, at least four point weldings are arranged at the annular welding area A to realize preliminary fixation, the annular welding area B and the annular welding area C are first point-welded and then fully welded, the connection between the power line body, the core line body and the circular hollow body and the sealing of both ends are strengthened, the welding area D is fully welded after the power line body covers the reserved hole to complete the final sealing, the problems of improper temperature control and reduced sealing performance in traditional welding are avoided, the firmness of the connection between the power line body and the core line body and the sealing of the whole circular hollow body are improved, the welding steps are reduced through the innovative design of the metal sheath structure, the welding difficulty is reduced, targeted welding of multiple areas is realized, and the requirements of the heating cable on electrical performance and long-term protection performance are met.

[0028] The U-shaped clamping part is clamped and matched with the annular groove to realize stable positioning of the circular hollow body, the clamping and rotating functions of the left pneumatic rotary chuck and the right pneumatic rotary chuck are combined to ensure that the circular hollow body, the power line body and the core line body have no displacement during welding, welding defects caused by workpiece shaking are avoided, and the processing stability is improved.

[0029] The box body in the application is connected with the industrial dust collector to form a negative pressure dust collection airflow, the nozzle sprays the airflow to remove impurities in the welding area, and the two work together to efficiently collect the welding generated smoke and debris, avoid impurities pollution of the weld to affect the sealing performance, improve the working environment, and the formed supplementary airflow also has a cooling effect, achieving two goals at once. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 It is a schematic diagram of the metal sheath structure used in the welding sealing method of the application;

[0031] Figure 2 It is a structure distribution diagram when welding the annular welding areas A, B and C;

[0032] Figure 3 It is a structure distribution diagram when welding the welding area D;

[0033] Figure 4 It is a schematic diagram of the step flow of the welding sealing method provided by the application;

[0034] Figure 5 It is a schematic diagram of the overall structure of the welding sealing device provided by the application;

[0035] Figure 6 It is a schematic diagram of the local structure above the workbench in the application;

[0036] Figure 7 It is a schematic diagram of the three-axis moving group structure in the application;

[0037] Figure 8 It is a schematic diagram of the structure distribution of the two pneumatic rotary clamps and the positioning mechanism;

[0038] Figure 9 It is a schematic diagram of the local structure on the mounting plate in the application;

[0039] Figure 10 It is a schematic diagram of the swing adjusting mechanism structure in the application;

[0040] Figure 11 It is a schematic diagram of the line pressing mechanism structure in the application;

[0041] Figure 12 It is a schematic diagram of the detailed structure of the positioning mechanism in the application;

[0042] Figure 13 It is a schematic diagram of the airflow flow direction when welding.

[0043] In the figure: 01, circular hollow body; 011, lead-through hole A; 012, lead-through hole B; 013, reserved hole; 014, annular groove; 02, power line body; 03, core line body; 04, annular welding area A; 05, annular welding area B; 06, annular welding area C; 07, welding area D; 1, workbench; 11, left pneumatic rotary chuck; 111, mounting frame; 112, tray; 113, translation cylinder; 114, moving end; 12, right pneumatic rotary chuck; 2, three-axis moving group; 21, power guide rail A; 22, moving seat A; 23, power guide rail B; 24, moving seat B; 25, power guide rail C; 26, moving seat C; 3, mounting plate; 31, swing adjusting mechanism; 311, cylinder seat; 312, driving device; 313, inductive piece; 314, photoelectric inductor; 4, mounting seat; 5, visual positioning assembly; 6, laser welding assembly; 7, positioning mechanism; 71, L-shaped piece; 72, connecting piece; 73, U-shaped clamping part; 74, box body; 741, accommodation opening; 742, interface; 8, line pressing mechanism; 81, enclosing piece; 811, mounting groove; 82, pressing strip; 821, sliding long groove; 83, driving motor; 84, threaded rod; 85, nut sleeve; 86, traction arm; 87, U-shaped seat; 88, limiting roller; 9, flexible pipe; 91, nozzle. DETAILED DESCRIPTION

[0044] The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0045] In the description of the embodiments of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "connection", "installation" should be understood in a broad sense, for example, "connection" can be detachable connection, or can be non-detachable connection, can be direct connection, or can be indirect connection through intermediate medium. In addition, "communication" can be direct communication, or can be indirect communication through intermediate medium. Among them, "fixing" means connecting with each other and the relative positional relationship after connection does not change. The orientation language mentioned in the embodiments of the present application, such as "inner", "outer", "top", "bottom", etc., is only the direction of the drawing, therefore, the orientation language used is to better, more clearly illustrate and understand the embodiments of the present application, and cannot be understood as indicating or implying that the device or element indicated must have a specific orientation, be constructed and operated in a specific orientation, therefore, cannot be understood as a limitation on the embodiments of the present application.

[0046] In the embodiments of the present application, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features limited by "first", "second" can explicitly or implicitly include one or more of the features.

[0047] In the embodiments of the present application, "and / or" is only a description of the relationship between the associated objects, which means that there can be three relationships, for example, A and / or B can represent the following three cases: A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are an "or" relationship.

[0048] In this specification, reference to "one embodiment" or "some embodiments" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the application. The appearances of the phrases "in one embodiment", "in some embodiments", "in other embodiments", "in additional embodiments" and so on, in various places in the specification are not necessarily all referring to the same embodiment, unless otherwise specifically stated. The terms "comprising", "including", "having" and their variants mean "including but not limited to", unless otherwise specifically stated. Embodiment 1

[0049] Please refer to Figures 1-3 The present application provides a laser welding sealing method for mineral insulated heating cable and power line, the metal sheath used in the method includes a circular hollow body 01, wherein the circular hollow body 01 is made of 825 alloy or stainless steel and the like;

[0050] The circular hollow body 01 has a through hole A011 at one end for matching the power line body 02 to pass through, and has a through hole B012 at the other end for matching the core line body 03 to pass through, wherein the inner diameter of the through hole A011 is equal to the inner diameter of the circular hollow body 01, and matches the outer diameter of the power line body 02, the inner diameter of the through hole B012 is smaller than the inner diameter of the through hole A011, and matches the outer diameter of the core line body 03, in addition, the circular hollow body 01 has a reserved hole 013 on the outer peripheral wall which communicates with the inner cavity, for laser to enter the circular hollow body 01 to perform welding work.

[0051] As Figure 4 shown, the welding sealing method specifically includes the following steps:

[0052] Step 1, preparation before welding: position the metal sheath horizontally, ensure that the reserved hole 013 faces upwards, as Figure 2 shown, pass the power line body 02 and the core line body 03 into the circular hollow body 01 from the through hole A011 and the through hole B012 respectively, so that the two abut in the circular hollow body 01, and ensure that the annular welding area A04 formed at the abutting position of the two corresponds to the position of the reserved hole 013;

[0053] Step two, welding fixation: laser welding is performed on the annular welding area A04 at the reserved hole 013, which is spot welding, and the welding points are at least four and are distributed along the annular path. Multi-point spot welding can realize the connection and fixation of the power line body 02 and the core line body 03.

[0054] Then, laser welding is performed on the annular welding area B05 formed between the power line body 02 and the end wall of the circular hollow body 01, which is spot welding first and then full welding. Then, laser welding is performed on the annular welding area C06 formed between the core line body 03 and the end wall of the circular hollow body 01, which is spot welding first and then full welding. Spot welding first can preliminarily fix the power line body 02 and the core line body 03 to the end wall of the circular hollow body 01, respectively, and full welding later can ensure that the connection between the power line body 02 and the core line body 03 and the circular hollow body 01 is more secure.

[0055] At the same time, as shown in Figure 3 , the annular welding area B05 and the annular welding area C06 are annular welding paths, respectively forming annular welds, which can seal the gap between the three-axis moving group 2 and the through-hole A011 and the gap between the core line body 03 and the through-hole B012, forming the welding seal at both ends of the circular hollow body 01.

[0056] Step three, welding and sealing: translate the power line body 02 and the core line body 03 as a whole to the side of the through-hole B012, as shown in Figure 3 , so that the outer wall of the power line body 02 covers the reserved hole 013, and then laser weld the welding area D07 formed between the inner port of the reserved hole 013 and the outer wall of the power line body 02. The welding path of the welding area D07 is annular.

[0057] The weld formed at the welding area D07 can seal the gap between the inner port of the reserved hole 013 and the outer wall of the power line body 02, achieving the final sealing, so that the circular hollow body 01 provides sealing protection effect to the connection of the power line body 02 and the core line body 03, and the welding of the outer walls of the power line body 02 and the core line body 03 at both ends of the circular hollow body 01 effectively ensures the electrical performance of the mineral insulated heating cable. Embodiment 2

[0058] Please refer to Figures 5-13 , this embodiment provides a mineral insulated heating cable and power line laser welding and sealing device, which is applied to the welding and sealing method in embodiment 1.

[0059] The device comprises a workbench 1 fixed above a cabinet (not labeled in the figure) and left and right pneumatic rotary clamps 11 and 12 arranged on both sides above the workbench 1, wherein the left and right pneumatic rotary clamps 11 and 12 are both of the prior art and both have clamping and rotating functions. Specifically, the left and right pneumatic rotary clamps 11 and 12 are mainly composed of a pneumatic driving part, a rotating mechanism, a clamping assembly, a gas control valve and the like, and the working principle is that compressed air enters the cylinder through the gas control valve to drive the clamping assembly to open or close the clamping jaw to realize the grabbing and releasing of the workpiece. At the same time, the rotating shaft is supported by the bearing and driven by the pneumatic drive or other drive structure to rotate the clamped workpiece synchronously, thereby meeting the cooperative requirements of workpiece clamping and rotating in machining, handling and the like, and the specific details are not described in detail.

[0060] A positioning mechanism 7 for positioning and placing the circular hollow body 01 is arranged between the left and right pneumatic rotary clamps 11 and 12 above the workbench 1, which can position and place the circular hollow body 01 to ensure that the reserved hole 013 faces upward.

[0061] Secondly, the left and right pneumatic rotary clamps 11 and 12 are both provided with horizontally extending holes for the power line body 02 and the core line body 03 to pass through. The power line body 02 is inserted into the hole in the right pneumatic rotary clamp 12 and then passes out between the clamping jaws of the right pneumatic rotary clamp 12, and then inserted into the circular hollow body 01 from the through hole A011. The core line body 03 is inserted into the hole in the left pneumatic rotary clamp 11 and then passes out between the clamping jaws of the left pneumatic rotary clamp 11, and then inserted into the circular hollow body 01 from the through hole B012, and the power line body 02 and the core line body 03 are ensured to abut in the circular hollow body 01, and the abutting position of the two is ensured to correspond to the position of the reserved hole 013.

[0062] Then the clamping jaws on both sides are driven to clamp the power line body 02 and the core line body 03, realizing the positioning of the abutting state of the power line body 02 and the core line body 03, and avoiding the abutting state from being invalid due to the random movement of the power line body 02 and the core line body 03. At this time, the preparation work before welding is completed.

[0063] The left pneumatic rotary clamp 11 is provided with a tray 112 on the side through a mounting frame 111, and the tray 112 is used to prevent the cable reel. The tray 112 is provided with a wire pressing mechanism 8 for pressing the cable reel on the tray 112 to avoid the cable reel from being loose.

[0064] Further, the installation plate 3 is installed on the workbench 1 through the three-axis moving group 2, the front side of the installation plate 3 is installed with the mounting seat 4 through the swing adjusting mechanism 31, the mounting seat 4 is provided with the visual positioning assembly 5 and the laser welding assembly 6, and the three-axis moving group 2 is used for driving the installation plate 3, the mounting seat 4, the visual positioning assembly 5 and the laser welding assembly 6 to be adjusted in left-right, up-down and front-back directions, and the swing adjusting mechanism 31 is used for driving the mounting seat 4 to be adjusted in rotation, so that the welding angle of the laser welding assembly 6 is adjusted.

[0065] Further, as shown in Figure 8 The left-right horizontally extending translation cylinder 113 is fixed on the workbench 1, the left pneumatic rotary chuck 11 is installed on the top of the moving end 114 of the translation cylinder 113, and the translation cylinder 113 is used for driving the left pneumatic rotary chuck 11 to be adjusted in left-right direction, so that the distance between the left pneumatic rotary chuck 11 and the right pneumatic rotary chuck 12 is adjusted.

[0066] The visual positioning assembly 5 mainly includes an image acquisition device and an image processing module, and the laser welding assembly 6 mainly includes a laser generator, a laser focusing device and a laser welding control system. The image acquisition device adopts an industrial camera with high resolution, is used for acquiring image information of a to-be-welded part of a mineral insulated heating cable, the image processing module is provided with an image processing algorithm, analyzes and processes the acquired image, realizes accurate identification and positioning of a weld, and transmits the positioning information to the laser welding control system. The laser generator is used for generating pulsed laser, the laser focusing device can focus the laser generated by the laser generator into a light spot, and accurately irradiate the light spot on the weld. The laser welding control system controls the working parameters of the laser generator according to the information transmitted by the visual positioning assembly 5, realizes accurate control of the laser welding process, and the specific structure and working principle of the visual positioning assembly 5 and the laser welding assembly 6 are not described in detail.

[0067] The specific steps of realizing welding sealing by using the device are as follows:

[0068] The circular hollow body 01 is positioned between the left pneumatic rotary chuck 11 and the right pneumatic rotary chuck 12 by using the positioning mechanism 7, the reserved hole 013 is ensured to face upward, the power line body 02 is inserted into the hole of the right pneumatic rotary chuck 12, and then is inserted into the circular hollow body 01 from the clamping jaw of the right pneumatic rotary chuck 12, the core wire body 03 is inserted into the hole of the left pneumatic rotary chuck 11, and then is inserted into the circular hollow body 01 from the clamping jaw of the left pneumatic rotary chuck 11, the power line body 02 and the core wire body 03 are ensured to abut in the circular hollow body 01, the abutting positions of the power line body 02 and the core wire body 03 correspond to the position of the reserved hole 013, and then the clamping jaws on both sides are driven to clamp the power line body 02 and the core wire body 03.

[0069] Through the cooperation of the visual positioning assembly 5 and the laser welding assembly 6, combined with the three-axis movement effect of the three-axis movement group 2 and the swing adjustment effect of the swing adjustment mechanism 31, spot welding is performed on the annular welding area A04 at the reserved hole 013. After one spot welding, the left pneumatic rotary chuck 11 and the right pneumatic rotary chuck 12 are synchronously rotated to drive the circular hollow body 01, the power line body 02, and the core line body 03 to rotate by a certain angle, and the next spot welding is performed, and the process is repeated to complete at least four spot weldings.

[0070] Through the cooperation of the visual positioning assembly 5 and the laser welding assembly 6, combined with the three-axis movement effect of the three-axis movement group 2 and the swing adjustment effect of the swing adjustment mechanism 31, spot welding is performed on the annular welding area A04 at the reserved hole 013. After one spot welding, the left pneumatic rotary chuck 11 and the right pneumatic rotary chuck 12 are synchronously rotated to drive the circular hollow body 01, the power line body 02, and the core line body 03 to rotate by a certain angle, and the next spot welding is performed, and the process is repeated to complete at least four spot weldings.

[0071] Then the clamping jaw on the right pneumatic rotary chuck 12 is driven to release the power line body 02, and the moving end 114 is driven away from the right pneumatic rotary chuck 12 by the translation cylinder 113, and the left pneumatic rotary chuck 11 is driven away from the right pneumatic rotary chuck 12, so that the distance between the left pneumatic rotary chuck 11 and the right pneumatic rotary chuck 12 increases, and the circular hollow body 01, the power line body 02, and the core line body 03 move as a whole to the left side of the left pneumatic rotary chuck 11, until the inner port of the reserved hole 013 is completely shielded by the outer wall of the power line body 02. Then, through the cooperation of the visual positioning assembly 5 and the laser welding assembly 6, combined with the three-axis movement effect of the three-axis movement group 2 and the swing adjustment effect of the swing adjustment mechanism 31, full welding is performed on the welding area D07, and the welding and sealing of the core line and the power line of the heating cable are completed. Example 3

[0072] Please refer to Figure 7 , Figure 9 and Figure 10 The difference between this embodiment and example 2 is:

[0073] The three-axis moving group 2 comprises a power guide rail A21, a power guide rail B23 and a power guide rail C25. The power guide rail A21 is horizontally arranged on the workbench 1, the power guide rail B23 is horizontally arranged on the top of the moving seat A22 of the power guide rail A21, and the power guide rail C25 is vertically arranged on the top of the moving seat B24 of the power guide rail B23. The mounting plate 3 is mounted on the moving seat C26 at the front side of the power guide rail C25. The power guide rail A21 can drive the moving seat A22 to move left and right, and is used to drive the mounting plate 3 to move left and right. The power guide rail B23 can drive the moving seat B24 to move forward and backward, and is used to drive the mounting plate 3 to move forward and backward. The power guide rail C25 can drive the power guide rail C25 to move up and down, and is used to drive the mounting plate 3 to move up and down. In this way, the visual positioning assembly 5 and the laser welding assembly 6 can move up and down, left and right, and forward and backward.

[0074] The swing adjusting mechanism 31 comprises a cylinder seat 311 and a driving device 312. The cylinder seat 311 is rotatably mounted on the front side surface of the mounting plate 3, and the mounting seat 4 is fixed on the front side end of the cylinder seat 311. The driving device 312 is arranged on the mounting plate 3 and is used to drive the cylinder seat 311 to rotate. The driving device 312 mainly comprises a driving motor, a gear ring and a gear. The driving motor is fixed on the mounting plate 3, the gear is fixed on the output shaft of the driving motor, and the gear ring is fixedly sleeved on the outside of the cylinder seat 311 and is in meshing connection with the gear. Through the operation of the driving motor, the output shaft can drive the cylinder seat 311 and the mounting seat 4 to rotate under the meshing transmission of the gear ring and the gear. In this way, the visual positioning assembly 5 and the laser welding assembly 6 can be stably driven to swing.

[0075] As shown in Figure 10 , three photoelectric sensors 314 are arranged at intervals on the front side surface of the mounting plate 3 at the periphery of the cylinder seat 311. The three photoelectric sensors 314 are distributed around the axis of the cylinder seat 311. The top of the mounting seat 4 is fixed with a sensing piece 313. The sensing piece 313 is in sensing cooperation with the three photoelectric sensors 314 respectively. Specifically, when the sensing piece 313 is in sensing cooperation with the middle photoelectric sensor 314, the laser generated by the laser welding assembly 6 is vertically downward, which is used for welding at the annular welding area A04 or the welding area D07. When the sensing piece 313 is in sensing cooperation with the left photoelectric sensor 314, the laser generated by the laser welding assembly 6 is used for welding at the annular welding area C06. When the sensing piece 313 is in sensing cooperation with the right photoelectric sensor 314, the laser generated by the laser welding assembly 6 is used for welding at the annular welding area B05. Embodiment 4

[0076] Please refer to Figure 12 , the difference between this embodiment and embodiment 3 is:

[0077] The positioning mechanism 7 includes a connecting piece 72 and a pair of L-shaped pieces 71. The connecting piece 72 is arranged above the workbench 1 and between the left pneumatic rotary chuck 11 and the right pneumatic rotary chuck 12. The two L-shaped pieces 71 are symmetrically fixed on the two sides of the connecting piece 72. The connecting piece 72 and the vertical part of the U-shaped clamping part 73 form the U-shaped clamping part 73. The outer wall of the circular hollow body 01 is provided with an annular groove 014 matched with the U-shaped clamping part 73. When the circular hollow body 01 is positioned and placed, the circular hollow body 01 is clamped on the U-shaped clamping part 73, so that the connecting piece 72 and the two L-shaped pieces 71 are respectively aligned and clamped into the annular groove 014, and the positioning and clamping of the circular hollow body 01 are realized. At the same time, the circular hollow body 01 has the ability to rotate on the U-shaped clamping part 73.

[0078] In addition, the box body 74 with an opening upward is fixed above the workbench 1. The two L-shaped pieces 71 are respectively fixed on the inner walls of the two sides of the box body 74. The two sides of the box body 74 are respectively provided with a clearance 741 corresponding to the position of the U-shaped clamping part 73, so as to give a position for the power line body 02 and the core line body 03 to be introduced into the box body 74. The front side of the box body 74 is provided with an interface 742 connected with an industrial dust collector (not shown in the figure) through a pipeline. When welding, the industrial dust collector works to generate a negative pressure effect, so that external air is sucked from the top opening of the box body 74 into the box body 74, and then flows into the industrial dust collector through the interface 742 and the pipeline, forming a negative pressure dust suction airflow. Therefore, the welding generated debris and smoke dust can be sucked, collected and treated, reducing the pollution of the processing site.

[0079] Secondly, as shown in Figure 9 , the side of the laser welding assembly 6 is provided with a flexible pipe 9. One end of the flexible pipe 9 is connected with a wind supply device (not shown in the figure), and the other end is communicatedly installed with a nozzle 91. Through the working of the wind supply device, airflow is generated, flows into the flexible pipe 9, and is finally sprayed out of the nozzle 91. As shown in Figure 13 , the nozzle 91 is adjusted to be aligned with the welding position. The sprayed airflow can blow the pre-welding dirt and the welding debris into the box body 74, and complement the negative pressure airflow generated in the box body 74, achieving the effect of removing impurities and preventing pollution.

[0080] In addition, the size of the opening at the upper end of the box body 74 is matched with the range of the airflow sprayed by the nozzle 91, and after the airflow sprayed by the nozzle 91 impacts on the outer surface of the circular hollow body 01, it flows along the outer wall of the circular hollow body 01. It is enough to cover most of the outer wall of the circular hollow body 01, and to complement and enhance the negative pressure airflow generated in the box body 74. Not only can it improve the capture effect of smoke dust and impurity debris, but also can accelerate the cooling after welding, and the cooling range is enough to cover all the welding areas. Example 5

[0081] Please refer to Figure 11 , the difference between this embodiment and example 4 is that:

[0082] Specifically, the wire pressing mechanism 8 comprises a pressing strip 82, a driving motor 83, a threaded rod 84, a nut sleeve 85 and a traction arm 86, the driving motor 83 is fixed at the center of the upper surface of the tray 112, the threaded rod 84 is vertically fixed at the end of the output shaft of the driving motor 83, the nut sleeve 85 is threadedly matched and sleeved on the threaded rod 84, the upper surface of the tray 112 is fixed with a surrounding fence 81 which is distributed around the driving motor 83, the top end of the surrounding fence 81 is provided with four installation grooves 811 respectively, four pressing strips 82 are hingedly installed in the four installation grooves 811 respectively, the four pressing strips 82 are all provided with sliding long grooves 821 which extend along the length direction of the pressing strips 82, the outer wall of the nut sleeve 85 is uniformly fixed with four downwardly extending traction arms 86, the ends of the four traction arms 86 are fixed with U-shaped seats 87 respectively, the four U-shaped seats 87 are all rotatably installed with limiting rollers 88, and the four limiting rollers 88 are matched and limited in the sliding long grooves 821 respectively.

[0083] When the cable coil is pressed and placed, the threaded rod 84 is driven to rotate by the driving motor 83, the threaded nut sleeve 85 is driven to move upwards, under the combined action of the traction of the nut sleeve 85 and the limiting of the limiting rollers 88 and the sliding long grooves 821, each pressing strip 82 is driven to swing upwards, so that the distribution range of the pressing strip 82 on the horizontal plane is reduced, thereby when the cable coil is placed on the tray 112, the wire pressing mechanism 8 can smoothly pass through the central area of the coil.

[0084] After the coil is placed on the tray 112, the threaded rod 84 is reversely driven to rotate by the driving motor 83, the threaded nut sleeve 85 is driven to move downwards, under the traction of the traction arms 86, the pressing strip 82 is driven to swing downwards, and finally the pressing strip 82 can press the coil tightly to prevent loosening.

[0085] The control mode of the present application is automatically controlled by a controller, the control circuit of the controller can be realized by simple programming of those skilled in the art, and the power supply also belongs to the common knowledge in the art, so the control mode and circuit connection of the present application will not be explained in detail.

[0086] It is apparent for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and the present application can be realized in other specific forms without departing from the spirit or essential characteristics of the present application.

Claims

1. A mineral insulated heating cable and power line laser welding sealing method, characterized in that: The metal sheath used in the welding sealing method comprises a circular hollow body (01), one end of the circular hollow body (01) has a through hole A (011) for matching the power line body (02) to pass through, and the other end has a through hole B (012) for matching the core line body (03) to pass through; The inner diameter of the through hole A (011) is equal to the inner diameter of the circular hollow body (01), the inner diameter of the through hole B (012) is smaller than the inner diameter of the through hole A (011), and the circular hollow body (01) has a reserved hole (013) on the outer peripheral wall which communicates with the inner cavity; The welding sealing method specifically comprises the following steps: Step one, preparation before welding: position the metal sheath horizontally, ensure that the reserved hole (013) faces upwards, pass the power line body (02) and the core line body (03) into the circular hollow body (01) from the through hole A (011) and the through hole B (012) respectively, make the two abut in the circular hollow body (01), and ensure that the annular welding area A (04) formed at the abutting position of the two corresponds to the position of the reserved hole (013); Step two, welding fixation: laser weld at the annular welding area A (04); Laser weld at the annular welding area B (05) formed between the power line body (02) and the end wall of the circular hollow body (01); Laser weld at the annular welding area C (06) formed between the core line body (03) and the end wall of the circular hollow body (01); Step three, welding sealing: translate the power line body (02) and the core line body (03) as a whole to the side of the through hole B (012), so that the outer wall of the power line body (02) covers the reserved hole (013), and then laser weld at the welding area D (07) formed between the inner port of the reserved hole (013) and the outer wall of the power line body (02).

2. The mineral insulated heating cable and power line laser welding sealing method according to claim 1, characterized in that: The welding at the annular welding area A (04) is spot welding, and the welding points have at least four positions and are distributed along the annular path; The welding at the annular welding area B (05) is spot welding first and then full welding; The welding at the annular welding area C (06) is spot welding first and then full welding; The welding at the welding area D (07) is full welding.

3. A mineral insulated heating cable and power line laser welding sealing device, applied to the welding sealing method of the core line and the power line of the heating cable in any one of the above claims 1 and 2, characterized in that: It comprises a workbench (1) fixed above a cabinet and left and right pneumatic rotary clamps (11) and (12) arranged on both sides above the workbench (1); The left pneumatic rotary clamp (11) is provided with a tray (112) through a mounting bracket (111) on the side, and the tray (112) is provided with a wire pressing mechanism (8) for pressing the cable line on the tray (112). The workbench (1) is provided with a mounting plate (3) through a three-axis moving group (2), the front side of the mounting plate (3) is provided with a mounting seat (4) through a swing adjusting mechanism (31), and the mounting seat (4) is provided with a visual positioning assembly (5) and a laser welding assembly (6); The swing adjusting mechanism (31) is used for driving the mounting seat (4) to rotate and adjust; The left pneumatic rotary chuck (11) and the right pneumatic rotary chuck (12) are both provided with horizontally extending holes for the power line body (02) and the core line body (03) to pass through respectively; The workbench (1) is provided with a positioning mechanism (7) for positioning and placing the circular hollow body (01) above the left pneumatic rotary chuck (11) and the right pneumatic rotary chuck (12); The swing adjusting mechanism (31) comprises a cylinder seat (311) and a driving device (312); The cylinder seat (311) is rotatably installed on the front side surface of the mounting plate (3), and the mounting seat (4) is fixed on the front side end of the cylinder seat (311); The driving device (312) is arranged on the mounting plate (3) and used for driving the cylinder seat (311) to rotate and adjust; Three photoelectric sensors (314) are arranged at intervals on the front side surface of the mounting plate (3) at the periphery of the cylinder seat (311), and the three photoelectric sensors (314) are distributed around the axis of the cylinder seat (311); The mounting seat (4) is fixed with a sensing piece (313), and the sensing piece (313) is in sensing cooperation with the three photoelectric sensors (314) respectively; When the sensing piece (313) is in sensing cooperation with the middle photoelectric sensor (314), the laser welding assembly (6) is used for welding at the annular welding area A (04) or the welding area D (07); When the sensing piece (313) is in sensing cooperation with the left photoelectric sensor (314), the laser welding assembly (6) is used for welding at the annular welding area C (06); When the sensing piece (313) is in sensing cooperation with the right photoelectric sensor (314), the laser welding assembly (6) is used for welding at the annular welding area B (05).

4. The mineral insulation heating cable and power line laser welding sealing device according to claim 3, characterized in that: The three-axis moving group (2) comprises a power guide rail A (21), a power guide rail B (23) and a power guide rail C (25); The power guide rail A (21) is horizontally arranged on the workbench (1) and used for driving the mounting plate (3) to perform left-right translation adjustment; The power guide rail B (23) is horizontally arranged on the top of the moving seat A (22) of the power guide rail A (21) and used for driving the mounting plate (3) to perform front-rear translation adjustment; The power guide rail C (25) is vertically arranged on the top of the moving seat B (24) of the power guide rail B (23) and used for driving the mounting plate (3) to perform lifting adjustment; The mounting plate (3) is arranged on the moving seat C (26) in front of the power guide rail C (25).

5. The mineral insulated heating cable and power line laser welding sealing device according to claim 3, characterized in that: The positioning mechanism (7) comprises a connecting piece (72) and a pair of L-shaped pieces (71); The connecting piece (72) is arranged above the workbench (1) and between the left pneumatic rotary chuck (11) and the right pneumatic rotary chuck (12); The two L-shaped pieces (71) are symmetrically fixed on both sides of the connecting piece (72); The connecting piece (72) and the vertical parts of the two L-shaped pieces (71) form a U-shaped clamping part (73); The outer wall of the circular hollow body (01) is provided with an annular groove (014) matched with the U-shaped clamping part (73).

6. The mineral insulated heating cable and power line laser welding sealing device according to claim 3, characterized in that: The workbench (1) is fixed with horizontally extending translation cylinders (113) on the left and right sides; The left pneumatic rotary chuck (11) is installed on the top of the moving end (114) of the translation cylinder (113); The translation cylinder (113) is used to drive the left pneumatic rotary chuck (11) to move left and right to adjust the distance between the left pneumatic rotary chuck (11) and the right pneumatic rotary chuck (12).

7. The mineral insulated heating cable and power line laser welding sealing device according to claim 5, characterized in that: The workbench (1) is fixed with an open-topped box body (74) above, and the two L-shaped pieces (71) are respectively fixed on the inner walls of the two sides of the box body (74); The two sides of the box body (74) are respectively provided with a clearance (741) corresponding to the position of the U-shaped clamping part (73); The front side of the box body (74) has an interface (742) connected with an industrial dust collector through a pipeline; The side of the laser welding assembly (6) is provided with a flexible pipe (9), and the distal end of the flexible pipe (9) is communicatively installed with a nozzle (91).

8. The mineral insulated heating cable and power line laser welding sealing device according to claim 3, characterized in that: The wire pressing mechanism (8) comprises a pressing strip (82), a driving motor (83), a threaded rod (84), a nut sleeve (85), and a traction arm (86); The driving motor (83) is fixed on the center of the upper surface of the tray (112), the threaded rod (84) is vertically fixed on the output shaft end of the driving motor (83), and the nut sleeve (85) is threadedly matched with the threaded rod (84); The upper surface of the tray (112) is fixed with a surrounding fence (81) distributed around the driving motor (83), and the top end of the surrounding fence (81) is respectively provided with a mounting groove (811), and the four mounting grooves (811) are respectively hingedly installed with the pressing strips (82); The four pressing strips (82) are respectively provided with a sliding long groove (821) extending along the length direction thereof. The nut sleeve (85) is uniformly fixed with four inclined downward extending traction arms (86) on the outer wall, the four traction arms (86) are fixed with U-shaped seats (87) at the ends, the four U-shaped seats (87) are rotatably installed with limiting rollers (88), and the four limiting rollers (88) are matched with the limiting clamps in the sliding long groove (821) one by one.

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