Dot Matrix Thermal Insulation Heating System and Ship Panel Sub-assembly Welding Production Line

Abstract

The present invention discloses a dot matrix type heat preservation and heating system and a ship sheet type sub-assembly welding production line, which includes a support frame and a plurality of conveying rollers rotatably arranged at both ends on the support frame. It further includes a plurality of heating units arranged on the support frame, and the plurality of heating units are distributed in an M-row and N-column manner. The heating unit includes a bottom junction box, a ceramic heating block, a workpiece detection sensor, and a temperature measurement sensor. The ceramic heating blocks are evenly distributed in a P-row and Q-column manner, and the ceramic heating blocks are located between the conveying rollers. There is a gap between two adjacent ceramic heating blocks. A workpiece detection sensor and a temperature measurement sensor are respectively fixed on both sides of each ceramic heating block along the length direction of the conveying roller. When the present invention is used for welding ship sheets, the temperature difference between the part of the sheet near the weld and other parts is small, the sheet is not easily bent and deformed, and the temperature of the sheet is the same, that is, the present invention enables the ship sheet to be welded at the same temperature, thereby ensuring the consistency of the welding quality of the ship sheet.

Description

Technical Field

[0001] The present invention relates to a dot matrix type heat preservation heating system and a ship sheet type sub-assembly welding production line, belonging to the technical field of ship manufacturing production lines. Background Art

[0002] In the process of ship manufacturing, welding is an important technological process. A Chinese utility model patent with the publication number CN210549072U discloses a ship sub-assembly welding workstation, which includes a gantry moving platform, a welding robot, and a welding end effector. The gantry moving platform includes an integral gantry and two tracks. The tracks are laid on the working site. The integral gantry is placed on the tracks and can move back and forth along the tracks. A transverse movement device is provided on the gantry, and the transverse movement device moves left and right on the gantry. An up and down lifting mechanism is arranged on the transverse movement device, and the up and down lifting mechanism moves up and down relative to the gantry. The welding robot is installed on the up and down lifting mechanism of the transverse movement device of the gantry moving platform. The welding robot can realize six-degree-of-freedom movement of front and back, left and right, and up and down with the movement of the gantry, the transverse movement device, and the up and down lifting mechanism. The welding end effector is installed on the working end of the welding robot. The welding end effector includes a welding device, a reference alignment unit, a weld tracker, and a workpiece temperature detection device. The reference alignment unit includes an industrial camera and a laser distance sensor to detect the processing reference and provide a control basis for aligning the processing reference. The weld tracker includes a laser emitter and an industrial camera to track the weld seam.

[0003] For the ship sub-assembly welding workstation disclosed in the above patent, before welding the workpiece, heating is not carried out. And during welding, only the weld seam part has a higher temperature, and the temperature of the entire workpiece is uneven. During welding, due to the higher temperature of the welding part, the entire workpiece is prone to deformation, affecting the quality of the workpiece. And after each station welds the workpiece, the temperature of this station also changes accordingly. Each time the workpiece is welded, the different station temperatures also result in poor welding consistency of the workpiece. Summary of the Invention

[0004] An object of the present invention is to provide a dot matrix type heat preservation heating system to solve the technical defects in the prior art that during ship sheet welding, the temperature difference between the part of the sheet near the weld seam and other parts is relatively large, the sheet is prone to deformation, and the welding effect of the sheet varies due to different welding temperatures, which is not conducive to the overall welding quality of the ship.

[0005] To solve the above problems, the technical solution adopted by the present invention is: a dot matrix type heat preservation and heating system, including a support frame and multiple conveying rollers rotatably arranged at both ends on the support frame, and further including multiple heating units arranged on the support frame. The multiple heating units are distributed in M rows and N columns, where both M and N are integers greater than or equal to 1. The heating unit includes a bottom junction box, a ceramic heating block, a workpiece detection sensor, and a temperature measurement sensor. The bottom junction box is fixed on the support frame and is located below the conveying roller. The bottom junction boxes of two adjacent heating units are fixed to each other. The ceramic heating block is fixed on the top of the bottom junction box. The ceramic heating blocks are evenly distributed in P rows and Q columns, and a ceramic heating block is provided between every two adjacent conveying rollers, where both P and Q are integers greater than or equal to 1. A gap is left between two adjacent ceramic heating blocks. A workpiece detection sensor and a temperature measurement sensor are respectively fixed on both sides of each ceramic heating block along the length direction of the conveying roller. The workpiece detection sensor is used to detect the position of the workpiece conveyed by the conveying roller, and the temperature measurement sensor is used to detect the temperature of the workpiece. The present invention is used in the welding of ship sheets. The conveying roller is used to convey the workpiece, and the heating unit is used to heat and keep the workpiece warm, ensuring that when all ship sheets are welded, the temperature difference between the part of the sheet near the weld and other parts is small, the sheet is not easily bent and deformed, and the temperature at which the sheet is located is the same, that is, the present invention enables the ship sheets to be welded at the same temperature, thereby ensuring the consistency of the welding quality of the ship sheets. The present invention sets multiple heating units, and can heat the workpiece only at the workpiece conveying place, thereby making use of energy and reducing the welding cost of the ship sheets. The workpiece detection sensor is used to detect the workpiece to determine which ceramic heating blocks heat the workpiece, and the temperature measurement sensor detects the temperature of the workpiece and adjusts the heating of the workpiece by the ceramic heating blocks. Since the present invention can ensure that the workpiece is under the same temperature conditions during welding, the welding quality of the ship sheets welded by the present invention is good in consistency, and the overall welding quality of the ship is better.

[0006] As a further improvement of the present invention, a plurality of conveying rollers are evenly arranged at intervals on the conveying roller. There is a ceramic heating block between two adjacent conveying rollers on the same conveying roller. The height of the top of the conveying roller is greater than the height of the top of the ceramic heating block. The present invention sets conveying rollers on the conveying roller. On the one hand, the workpiece is supported by the conveying rollers, reducing the contact surface with the workpiece. On the other hand, it provides a larger space for the installation of the ceramic heating block, facilitating the installation of the heating unit.

[0007] As a further improvement of the present invention, it further includes a protective plate which is arranged on the support frame. A number of through holes A corresponding to the ceramic heating blocks and a number of through holes B corresponding to the conveying rollers are provided on the protective plate. The ceramic heating blocks and the conveying rollers respectively protrude upward from the through holes A and B. A notch corresponding to the workpiece detection sensor and the temperature measurement sensor is provided on each side of the through hole A. The protective plate provided in the present invention can effectively prevent the workpiece from tilting during the conveying process and contacting the ceramic heating blocks, the workpiece detection sensor and the temperature measurement sensor, so as to damage the heating unit, thereby improving the service life of the present invention.

[0008] Another object of the present invention is to provide a small assembly welding production line for ship sheet bodies, which solves the technical defect of poor welding quality consistency of ship sheet bodies in the prior art.

[0009] To solve the above problems, the technical solution adopted by the present invention is: a small assembly welding production line for ship sheet bodies includes a workpiece assembly station, a buffer preheating station, a robot automatic heat preservation welding station, a manual inspection back burning repair and correction station, and a offline buffer station arranged in sequence from back to front. The workpiece assembly station is used for assembling and coding the sheet bodies and conveying the assembled workpieces towards the buffer preheating station. The buffer preheating station is used for preheating and storing the workpieces and conveying the workpieces towards the robot automatic heat preservation welding station. The robot automatic heat preservation welding station includes a welding robot and a dot matrix type heat preservation heating system, which are used for heating, heat preservation and welding of the workpieces, and conveying the welded workpieces towards the manual inspection back burning repair and correction station. The manual inspection back burning repair and correction station is used for back burning, repairing and correcting the welded workpieces, and conveying the workpieces towards the offline buffer station. The offline buffer station is used for discharging the welded workpieces. After the sheet bodies are assembled in the present invention, the workpieces are heated by the buffer preheating station, and then heated, heat-preserved and welded at the robot automatic heat preservation welding station, so that the welding of all sheet bodies is carried out at the same temperature, improving the welding quality consistency of the sheet bodies, and thus improving the overall welding quality of the ship.

[0010] As a further improvement of the present invention, the workpiece assembly station includes an assembly bracket, assembly conveying rollers, a cantilever crane system, a laser coding system and an assembly driving motor. The two ends of the assembly conveying rollers are rotatably arranged on the assembly bracket. The assembly driving motor is used to drive the assembly conveying rollers to rotate. The cantilever crane system is arranged on one side of the assembly bracket and is used to lift the ship sheet body onto the assembly conveying rollers. The laser coding system is arranged on the assembly bracket and is used to code the workpiece. In the present invention, through the cantilever crane system, it is convenient to lift the sheet body to be welded onto the assembly conveying rollers. After coding the workpiece, the assembly driving motor drives the assembly conveying rollers to rotate, and conveys the workpiece towards the buffer preheating station.

[0011] As a further improvement of the present invention, the cache preheating station includes a preheating bracket, preheating conveyor rollers, a preheating drive motor, and induction coils. Both ends of the preheating conveyor rollers are rotatably arranged on the preheating bracket and driven to rotate by the preheating drive motor. The induction coils are arranged at one end of the preheating bracket close to the robot automatic heat-preserving welding station. The induction coils are located below the space between the two preheating conveyor rollers and are used to preheat the workpieces conveyed by the preheating conveyor rollers. By arranging the induction coils, the present invention heats the workpieces passing above them, thereby heating the workpieces and making the workpieces conveyed to the robot automatic heat-preserving welding station have a relatively high temperature, so that the set temperature can be quickly reached at the robot automatic heat-preserving welding station.

[0012] As a further improvement of the present invention, the cache preheating station further includes a fixing frame. The fixing frame is arranged at one end close to the robot automatic heat-preserving welding station. A barcode scanner is arranged on the fixing frame and is used to scan the workpieces and determine the temperature and welding information of the workpieces. By arranging the barcode scanner at the robot automatic heat-preserving welding station in the present invention, it is convenient to scan the workpieces to determine the information required for welding, and the fixing frame facilitates the fixing of the barcode scanner.

[0013] As a further improvement of the present invention, a vision scanning device is arranged at one end of the manual inspection, back burning repair and correction station close to the robot automatic heat-preserving welding station and is used to detect whether the welded workpieces are arched. By arranging the vision scanning device in the present invention, it is convenient to judge whether there are arched defects in the workpieces, so that the workpieces with arched defects can be repaired and corrected as needed, further improving the quality of the welded workpieces.

[0014] As a further improvement of the present invention, safety fences are arranged on both sides of the cache preheating station, the robot automatic heat-preserving welding station, and the manual inspection, back burning repair and correction station, and safety doors are arranged on the safety fences. In the state where any one of the safety doors is opened, the workpiece assembly station, the cache preheating station, the robot automatic heat-preserving welding station, the manual inspection, back burning repair and correction station, and the offline cache station all stop working. By arranging the safety fences in the present invention, the safety of the present invention is improved. By setting the safety doors to form an interlock with the entire system, as long as the safety door is opened, the whole of the present invention will immediately stop running, further improving the safety of the present invention.

[0015] As a further improvement of the present invention, windproof soft curtains are arranged at both ends of the safety fence of the robot automatic heat-preserving welding station. By arranging the windproof soft curtains in the present invention, the influence of wind in the front and back directions on the welding arc can be effectively prevented, further improving the welding quality of the present invention.

[0016] In summary, the beneficial effects of the present invention are as follows: When welding the sheet body in the present invention, the sheet body is heated and heat-preserved, the temperature difference between the weld part of the sheet body and other parts far from the weld is reduced, and the welding quality of the ship sheet body type sub-assembly is ensured. Brief Description of the Drawings

[0017] Figure 1 is the front view of Embodiment 1.

[0018] Figure 2 is the top view of Embodiment 1.

[0019] Figure 3 is the left view of Embodiment 1.

[0020] Figure 4 is the schematic perspective view of Embodiment 1.

[0021] Figure 5 is Figure 2 the partial enlarged view at A in

[0022] Figure 6 is the front view of Embodiment 2.

[0023] Figure 7 is the top view of Embodiment 2.

[0024] Figure 8 is the top view of the cache preheating station in Embodiment 2.

[0025] Figure 9 is the schematic perspective view of the cache preheating station in Embodiment 2.

[0026] Wherein: 1, support frame; 2, conveying roller; 3, heating unit; 4, bottom junction box; 5, ceramic heating block; 6, workpiece detection sensor; 7, temperature measurement sensor; 8, conveying roller wheel; 9, protective plate; 10, through hole A; 11, notch; 12, workpiece assembly station; 13, cache preheating station; 14, robot automatic heat preservation welding station; 15, manual detection, back burning repair and correction station; 16, offline cache station; 17, assembly support; 18, assembly conveying roller; 19, cantilever crane system; 20, preheating support; 21, preheating conveying roller; 22, induction coil; 23, fixing frame; 24, barcode scanner; 25, vision scanning device; 26, back burning support frame; 27, back burning conveying roller; 28, scanning support; 29, offline frame; 30, offline conveying roller; 31, ground rail; 32, cantilever gantry system; 33, welding robot; 34, column; 35, cantilever beam; 36, electric hoist. Detailed Embodiments

[0027] The following further describes the detailed embodiments of the present invention with reference to the accompanying drawings. Embodiment 1

[0028] As Figures 1 to 5The dot matrix type heat preservation and heating system shown includes a support frame 1, a heat preservation and heating drive motor (not shown in the figure), and multiple conveying rollers 2 rotatably arranged at both ends on the support frame 1. The multiple conveying rollers 2 are arranged in parallel and at equal intervals. The left and right ends of the conveying rollers 2 are rotatably installed on the support frame 1 by bearings. At one end of each conveying roller 2, a sprocket (not shown in the figure) is provided, and the sprockets are connected by a chain. One end of one of the conveying rollers 2 is connected to the heat preservation and heating drive motor, and the conveying rollers 2 are driven by the heat preservation and heating drive motor to rotate synchronously in the same direction. In this embodiment, two sprockets are fixedly arranged on each conveying roller 2. Except for the frontmost and rearmost conveying rollers 2, the two sprockets on each conveying roller 2 are respectively connected to the sprockets on the two adjacent front and rear conveying rollers 2 by chains. Only one chain is used for the frontmost and rearmost conveying rollers 2 to be connected to the adjacent conveying rollers 2 by a chain. One of the sprockets on the frontmost or rearmost conveying roller 2 is connected to the output shaft of the heat preservation and heating drive motor by a chain. Thus, only one heat preservation and heating drive motor is needed in this embodiment to drive all the conveying rollers 2 to rotate synchronously for conveying workpieces. The heat preservation and heating drive motor in this embodiment is fixed at the lower part of the front end or the rear end of the support frame 1.

[0029] As Figures 1 to 5As shown in the figure, this embodiment is provided with a plurality of heating units 3. The heating units 3 are arranged on the support frame 1. The plurality of heating units 3 are distributed in M rows and N columns, where both M and N are integers greater than or equal to 1. The heating unit 3 in this embodiment includes a bottom junction box 4, a ceramic heating block 5, a workpiece detection sensor 6, and a temperature measurement sensor 7. The temperature measurement sensor 7 is an infrared temperature measurement sensor. The bottom junction box 4 is fixed on the support frame 1 and is located below the conveying roller 2. The bottom junction boxes 4 of two adjacent heating units 3 are fixed to each other. The cross-section of the bottom junction box 4 in this embodiment is rectangular, and the bottom junction boxes 4 of two adjacent heating units 3 are engaged with each other. This detachable installation of the bottom junction box 4 enables only the faulty heating unit 3 to be removed and replaced when one of the heating units 3 fails. The ceramic heating block 5 in this embodiment is fixed on the top of the bottom junction box 4. The ceramic heating blocks 5 are evenly distributed in P rows and Q columns, and a ceramic heating block 5 is provided between every two adjacent conveying rollers 2. The conveying roller 2 does not block the ceramic heating block 5, where both P and Q are integers greater than or equal to 1. A gap is left between two adjacent ceramic heating blocks 5, and the gap widths between every two ceramic heating blocks 5 are equal. A workpiece detection sensor 6 and a temperature measurement sensor 7 are respectively fixed on both sides of each ceramic heating block 5 along the length direction of the conveying roller 2. The workpiece detection sensor 6 is used to detect the position of the workpiece conveyed by the conveying roller 2, and the temperature measurement sensor 7 is used to detect the temperature of the workpiece. The workpiece detection sensor 6 is used to detect the position of the workpiece conveyance. When the temperature measurement sensor 7 detects that the temperature of the workpiece is lower than the set temperature, the corresponding ceramic heating block 5 operates to heat the workpiece. When the temperature measurement sensor 7 detects that the temperature of the workpiece reaches the set temperature, the corresponding ceramic heating block 5 operates to keep the temperature of the workpiece at the set temperature without decreasing. In this embodiment, the power lines of the ceramic heating block 5, the power lines and signal lines of the workpiece detection sensor 6 and the temperature measurement sensor 7 all extend downward into the bottom junction box 4 to reduce the influence of high temperature on them. The connection methods of the workpiece detection sensor 6, the temperature measurement sensor 7, and the ceramic heating block 5 to the control system in this embodiment are all prior arts and will not be elaborated in this embodiment.

[0030] As Figures 1 to 5 shown, in this embodiment, a plurality of conveying rollers 8 are fixedly arranged at equal intervals on the conveying roller 2. There is a ceramic heating block 5 between two adjacent conveying rollers 8 on the same conveying roller (2). The height of the top of the conveying roller 8 is slightly greater than the height of the top of the ceramic heating block 5. When the conveying roller 8 conveys the workpiece, the workpiece is lifted upward so that the workpiece does not directly contact the ceramic heating block 5, the workpiece detection sensor 6, and the temperature measurement sensor 7.

[0031] As Figures 1 to 5As shown in the figure, in this embodiment, a protective plate 9 is provided. The protective plate 9 is arranged on the support frame 1, and a number of through holes A10 corresponding to the ceramic heating blocks 5 and a number of through holes B corresponding to the conveying rollers 8 are formed in the protective plate 9. Both the through holes A10 and the through holes B are rectangular holes. The ceramic heating blocks 5 and the conveying rollers 8 respectively protrude upward from the through holes A10 and the through holes B. The workpiece detection sensor 6 and the temperature measurement sensor 7 are located below the protective plate 9. A notch 11 corresponding to the workpiece detection sensor 6 and the temperature measurement sensor 7 respectively is formed on each side of the through hole A10 to prevent the protective plate 9 from blocking the detection of the workpiece detection sensor 6 and the temperature measurement sensor 7. The notch 11 in this embodiment is semi-circular and is symmetrically arranged on both sides of the through hole A10. Embodiment 2

[0032] This embodiment is a small assembly welding production line for ship sheet bodies. As Figures 6 to 9 shown, it includes a workpiece assembly station 12, a buffer preheating station 13, a robot automatic heat preservation welding station 14, a manual inspection back burning repair and correction station 15, and a offline buffer station 16 arranged in sequence from back to front. The workpiece assembly station 12 is used for assembling and coding the sheet bodies and conveying the assembled workpieces towards the buffer preheating station 13. The buffer preheating station 13 is used for preheating and storing the workpieces and conveying the workpieces towards the robot automatic heat preservation welding station 14. The robot automatic heat preservation welding station 14 includes a welding robot 33 and the dot matrix type heat preservation heating system of Embodiment 1, and is used for heating, heat preservation and welding of the workpieces, and conveying the welded workpieces towards the manual inspection back burning repair and correction station 15. The manual inspection back burning repair and correction station 15 is used for back burning, repair and correction of the welded workpieces, and conveying the workpieces towards the offline buffer station 16. The offline buffer station 16 is used for blanking of the welded workpieces.

[0033] As Figures 6 to 9As shown in the figure, the workpiece assembly station 12 includes an assembly bracket 17, assembly conveyor rollers 18, a cantilever crane system 19, a laser coding system (not shown in the figure), and an assembly drive motor (not shown in the figure). There are multiple assembly conveyor rollers 18 which are arranged at equal intervals. The left and right ends of the assembly conveyor rollers 18 are rotatably arranged on the assembly bracket 17. The assembly drive motor is used to drive the assembly conveyor rollers 18 to rotate. In this embodiment, the connection method of the assembly conveyor rollers 18 and the connection method between the assembly conveyor rollers 18 and the assembly drive motor are the same as those of the dot matrix thermal insulation heating system, and will not be described in detail in this embodiment. The assembly drive motor in this embodiment is fixed at the lower part of the assembly bracket 17. The cantilever crane system 19 is arranged on one side of the assembly bracket 17 and is used to lift the ship sheet to the assembly conveyor rollers 18. The cantilever crane system 19 includes a column 34, a cantilever beam 35, and an electric hoist 36. One end of the cantilever beam 35 is rotatably arranged at the top of the column 34. The electric hoist 36 is arranged on the cantilever beam 35 and can move on the cantilever beam 35 to lift the sheets used for welding the workpiece to the assembly conveyor rollers 18 for manual assembly. The laser coding system is arranged on the assembly bracket 17 and is used to code the workpiece. After the sheets are manually assembled, the laser coding system is used to code the workpiece according to the welding requirements. In this embodiment, a bar code or a two-dimensional code is printed on the workpiece, which contains information such as the set temperature and welding method required for welding the workpiece.

[0034] As Figures 6 to 9 shown, the buffer preheating station 13 includes a preheating bracket 20, preheating conveyor rollers 21, a preheating drive motor (not shown in the figure), and an induction coil 22. There are multiple preheating conveyor rollers 21, and multiple preheating conveyor rollers 21 are arranged in parallel at equal intervals in the left-right direction. The two ends of the preheating conveyor rollers 21 are rotatably arranged on the preheating bracket 20 and are driven to rotate by the preheating drive motor. The connection method between the preheating drive motor and the preheating conveyor rollers 21 is the same as the connection method between the thermal insulation heating drive motor and the conveyor rollers 2. This will not be elaborated in this embodiment. The induction coil 22 in this embodiment is arranged at one end of the preheating bracket 20 close to the robot automatic thermal insulation welding station 14. The induction coil 22 is located below the two preheating conveyor rollers 21 and is used to preheat the workpiece conveyed by the preheating conveyor rollers 21. In this embodiment, three induction coils 22 are provided. The length directions of the three induction coils 22 are the same as the length direction of the preheating conveyor rollers 21, and the three induction coils 22 are arranged at equal intervals in the front-back direction. The three induction coils 22 are respectively located between four adjacent preheating conveyor rollers 21 in sequence. The distance between two adjacent induction coils 22 is equal to the distance between two adjacent preheating conveyor rollers 21. When the workpiece is conveyed, it passes above the three induction coils 22 in sequence, and the induction coil 22 preheats the workpiece to raise the temperature of the workpiece to the set welding temperature.

[0035] As Figures 6 to 9As shown, a fixing rack 23 is provided at the cache preheating station 13. The fixing rack 23 is arranged at one end close to the robot automatic heat-preserving welding station 14. A barcode scanner 24 is provided on the fixing rack 23 for scanning the workpiece, and information such as the set welding temperature and welding method of the workpiece is determined by scanning the barcode or two-dimensional code on the workpiece. A ground rail 31 is arranged on one side of the dot matrix heat-preserving heating system. The ground rail 31 is arranged along the front-back direction. A cantilever gantry system 32 is arranged on the ground rail 31. The cantilever gantry system 32 can move back and forth along the ground rail 31. A welding robot 33 is arranged on the cantilever of the cantilever gantry system 32. A vision scanning camera is arranged on the cantilever of the cantilever gantry system 32 for scanning the workpiece to determine the welding part of the workpiece. The welding robot 33 welds the workpiece according to the welding part of the workpiece determined by the vision scanning camera. The welding robot 33 in this embodiment can move synchronously with the movement of the cantilever gantry system 32.

[0036] As Figures 6 to 9 shown, the manual inspection back-burning repair and correction station 15 in this embodiment includes a back-burning support frame 26, back-burning conveying rollers 27 and a back-burning driving motor (not shown in the figure). The number of the back-burning conveying rollers 27 is multiple. The multiple back-burning conveying rollers 27 are arranged at equal intervals and in parallel. The left and right ends of the back-burning conveying rollers 27 are rotatably installed on the back-burning support frame 26. The back-burning driving motor is connected to the back-burning conveying rollers 27 for driving the back-burning conveying rollers 27 to rotate. The back-burning driving motor is fixed at the lower part of the back-burning support frame 26. The connection structure between the back-burning driving motor and the back-burning conveying rollers 27 is the same as the connection structure between the heat-preserving heating driving motor and the conveying roller 2, which is not elaborated in this embodiment. In this embodiment, a vision scanning device 25 is arranged at one end of the manual inspection back-burning repair and correction station 15 close to the robot automatic heat-preserving welding station 14 for detecting whether the welded workpiece has arching. In this embodiment, a scanning support frame 28 is erected on the manual inspection back-burning repair and correction station 15. The vision scanning device 25 is fixed on the scanning support frame 28. In this embodiment, a heating device is arranged on the back-burning support frame 26 close to the robot automatic heat-preserving welding station 14. The heating device preferably adopts the heating unit 3 in multiple Embodiment 1 for heating the workpiece. When the vision scanning device 25 scans the workpiece to form a photo and then the photo is manually identified, when it is found that the back panel at the bottom of the workpiece has arching, the heating unit 3 heats the workpiece, and the workpiece is repaired and corrected at a relatively high temperature to make the back panel of the workpiece flat for subsequent use.

[0037] As Figures 6 to 9As shown in the figure, the offline buffer station 16 in this embodiment includes an offline frame 29, offline conveying rollers 30, and an offline driving motor. There are multiple offline conveying rollers 30, which are arranged on the offline frame 29 at equal intervals. Both ends of the offline conveying rollers 30 are rotatably connected to the offline frame 29. The offline driving motor is used to drive the offline conveying rollers 30 to rotate relative to the offline frame 29. The connection method between the offline driving motor and the offline conveying rollers 30 in this embodiment is the same as that between the heat preservation heating driving motor and the conveying rollers 2, which will not be elaborated in this embodiment. The workpiece after repair and correction at the manual inspection, back burning repair, and correction station 15 is conveyed to the offline buffer station 16, conveyed on the offline buffer station 16, and taken offline for use in the next process, or directly conveyed to the next station.

[0038] In this embodiment, safety fences (not shown in the figure) are provided on both the left and right sides of the buffer preheating station 13, the robot automatic heat preservation welding station 14, and the manual inspection, back burning repair, and correction station 15. Safety doors (not shown in the figure) are provided on the safety fences. The safety fence includes a frame made of aluminum profiles and a panel fixed on the frame. In this embodiment, a safety door lock is provided on the safety door. The safety door lock is connected to the overall control system in this embodiment. When any safety door is opened, the safety door lock controls the workpiece assembly station 12, the buffer preheating station 13, the robot automatic heat preservation welding station 14, the manual inspection, back burning repair, and correction station 15, and the offline buffer station 16 to stop working through the control system, thereby improving safety. The safety fence in this embodiment also plays a role in wind prevention. In this embodiment, windproof soft curtains (not shown in the figure) are provided at both ends of the safety fence of the robot automatic heat preservation welding station 14, so as to effectively prevent the influence of the wind in the direction of workpiece conveyance on the welding arc.

[0039] As Figures 6 to 9As shown in the figure, when this embodiment is used for welding ship sheets, first, the cantilever crane system 19 is used to lift the cut metal plate onto the assembly conveying roller 18. Workers assemble the sheets manually, and the laser coding system is used to code the sheets. The assembly driving motor drives the assembly conveying roller 18 to convey the workpiece towards the buffer preheating station 13. The buffer preheating station 13 receives the workpiece conveyed by the workpiece assembly station 12 and conveys the workpiece towards the direction of the robot automatic heat preservation welding station 14. When the workpiece is conveyed close to the robot automatic heat preservation welding station 14, the induction coil 22 heats the workpiece to make the temperature of the workpiece close to the set temperature for welding, and the workpiece is continuously conveyed towards the robot automatic heat preservation welding station 14. After receiving the workpiece, the code scanning gun 24 of the robot automatic heat preservation welding station 14 scans the bar code or two-dimensional code on the workpiece to read the welding set temperature and welding method information therein. Then, the dot matrix heat preservation heating system heats and keeps the temperature of the workpiece. The welding robot 33 welds the workpiece and continues to convey the workpiece towards the manual inspection, back burning, repair and correction station 15. The vision scanning device 25 scans the workpiece, and workers check whether the sheet of the workpiece is arched. If it is arched, the heating unit 3 heats the workpiece, and workers repair and correct the workpiece manually, and then continue to convey the workpiece towards the direction of the offline buffer station 16. After receiving the workpiece, the offline buffer station 16 collects the welded workpieces at the offline buffer station 16, or the offline buffer station 16 conveys the workpiece to the station of the next processing procedure. When the safety door on the safety fence of this embodiment is opened, the entire system stops running, thereby improving the safety of this embodiment.

[0040] Parts not specifically described in the above description are all prior arts or can be realized through prior arts. Moreover, the specific implementation cases described in this invention are only the preferred implementation cases of this invention, and are not used to limit the implementation scope of this invention. That is, equivalent changes and modifications made according to the content of the scope of this invention patent should all be regarded as the technical scope of this invention.

Claims

1. Dot matrix type heat preservation and heating system, comprising a support frame (1) and a plurality of conveying rollers (2) rotatably arranged at both ends on the support frame (1), characterized in that: It further includes a protective plate (9) and a plurality of heating units (3) arranged on the support frame (1). The plurality of heating units (3) are distributed in M rows and N columns, where both M and N are integers greater than or equal to 1. The heating unit (3) includes a bottom junction box (4), a ceramic heating block (5), a workpiece detection sensor (6), and a temperature measurement sensor (7). The bottom junction box (4) is fixed on the support frame (1) and is located below the conveying roller (2). The cross-section of the bottom junction box (4) is rectangular, and the bottom junction boxes (4) of two adjacent heating units (3) are snap-fitted and fixed. The ceramic heating block (5) is fixed on the top of the bottom junction box (4). The ceramic heating blocks (5) are evenly distributed in P rows and Q columns, and a ceramic heating block (5) is provided between every two adjacent conveying rollers (2), where both P and Q are integers greater than or equal to 1. A gap is left between two adjacent ceramic heating blocks (5). A workpiece detection sensor (6) and a temperature measurement sensor (7) are respectively fixed on both sides of each ceramic heating block (5) along the length direction of the conveying roller (2). The workpiece detection sensor (6) is used to detect the position of the workpiece conveyed by the conveying roller (2), and the temperature measurement sensor (7) is used to detect the temperature of the workpiece. A plurality of conveying rollers (8) are evenly spaced on the conveying roller (2). A ceramic heating block (5) is provided between two adjacent conveying rollers (8) on the same conveying roller (2). The height of the top of the conveying roller (8) is greater than the height of the top of the ceramic heating block (5). The protective plate (9) is arranged on the support frame (1), and a plurality of through holes A (10) corresponding to the ceramic heating blocks (5) and a plurality of through holes B corresponding to the conveying rollers (8) are opened on the protective plate (9). The ceramic heating blocks (5) and the conveying rollers (8) respectively protrude upward from the through holes A (10) and the through holes B. A notch (11) corresponding to the workpiece detection sensor (6) and the temperature measurement sensor (7) is respectively opened on both sides of the through hole A (10). When the temperature measurement sensor (7) detects that the temperature of the workpiece is lower than the set temperature, the corresponding ceramic heating block (5) works to heat the workpiece. When the temperature measurement sensor (7) detects that the temperature of the workpiece reaches the set temperature, the corresponding ceramic heating block (5) works to keep the temperature of the workpiece at the set temperature without decreasing. The power lines of the ceramic heating block (5), the power lines and signal lines of the workpiece detection sensor (6) and the temperature measurement sensor (7) all extend downward into the bottom junction box (4).

2. Ship sheet sub-assembly welding production line, characterized in that: It includes a workpiece assembly station (12), a buffer preheating station (13), a robot automatic heat preservation welding station (14), a manual inspection, back burning repair and correction station (15), and a offline buffer station (16) arranged in sequence from back to front. The workpiece assembly station (12) is used for assembling and coding the sheet body and conveying the assembled workpiece towards the buffer preheating station (13). The buffer preheating station (13) is used for preheating and storing the workpiece and conveying the workpiece towards the robot automatic heat preservation welding station (14). The robot automatic heat preservation welding station (14) includes a welding robot and the dot matrix type heat preservation heating system described in claim 1, and is used for heating, heat preservation and welding of the workpiece, and conveying the welded workpiece towards the manual inspection, back burning repair and correction station (15). The manual inspection, back burning repair and correction station (15) is used for back burning, repair and correction of the welded workpiece, and conveying the workpiece towards the offline buffer station (16). The offline buffer station (16) is used for blanking of the welded workpiece.

3. The ship sheet-like sub-assembly welding production line according to claim 2, characterized in that: The workpiece assembly station (12) includes an assembly bracket (17), assembly conveying rollers (18), a cantilever crane system (19), a laser coding system and an assembly driving motor. The two ends of the assembly conveying rollers (18) are rotatably arranged on the assembly bracket (17). The assembly driving motor is used to drive the assembly conveying rollers (18) to rotate. The cantilever crane system (19) is arranged on one side of the assembly bracket (17) and is used to lift the ship sheet body onto the assembly conveying rollers (18). The laser coding system is arranged on the assembly bracket (17) and is used for coding on the workpiece.

4. The ship's sheet-like sub-assembly welding production line according to claim 2, characterized in that: The buffer preheating station (13) includes a preheating bracket (20), preheating conveying rollers (21), a preheating driving motor and an induction coil (22). The two ends of the preheating conveying rollers (21) are rotatably arranged on the preheating bracket (20) and are driven to rotate by the preheating driving motor. The induction coil (22) is arranged at one end of the preheating bracket (20) close to the robot automatic heat preservation welding station (14). The induction coil (22) is located below between the two preheating conveying rollers (21) and is used for preheating the workpiece conveyed by the preheating conveying rollers (21).

5. The ship sheet-like sub-assembly welding production line according to claim 2, wherein: The buffer preheating station (13) further includes a fixing frame (23). The fixing frame (23) is arranged at one end close to the robot automatic heat preservation welding station (14). A barcode scanner (24) is arranged on the fixing frame (23) and is used for scanning the workpiece and determining the temperature and welding information of the workpiece.

6. The ship sheet-like sub-assembly welding production line according to claim 2, characterized in that: A visual scanning device (25) is arranged at one end of the manual inspection, back burning repair and correction station (15) close to the robot automatic heat preservation welding station (14) and is used for detecting whether the welded workpiece has arching.

7. The welding production line for small assemblies of ship sheet bodies according to claim 2, characterized in that: Safety fences are arranged on both sides of the buffer preheating station (13), the robot automatic heat preservation welding station (14), and the manual inspection, back burning repair and correction station (15), and safety doors are arranged on the safety fences. In the state where any one of the safety doors is opened, the workpiece assembly station (12), the buffer preheating station (13), the robot automatic heat preservation welding station (14), the manual inspection, back burning repair and correction station (15), and the offline buffer station (16) all stop working.

8. The welding production line for small assemblies of ship sheet bodies according to claim 7, characterized in that: Both ends of the safety fence of the automatic heat-preserving welding station (14) of the robot are provided with windproof soft curtains.

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