Welding mechanical arm for intelligent construction

Abstract

The invention discloses a welding mechanical arm for intelligent construction, and particularly relates to the technical field of welding, the welding mechanical arm comprises a mechanical arm main body, a welding gun is fixed on the mechanical arm main body, a welding table is arranged on one side of the mechanical arm main body, two to-be-welded plates are arranged on the welding table, the welding gun is arranged above the two to-be-welded plates, and the welding gun is arranged above the two to-be-welded plates. A fixing ring is fixed to the outer side of the welding gun, and fixing assemblies are fixed to the front side and the rear side of the fixing ring correspondingly and used for fixing the two to-be-welded plates in the welding process. A preheating and cleaning assembly is arranged on one side of the fixing ring and used for cleaning and preheating the joint of the two to-be-welded plates. A scanning assembly is arranged on the other side of the fixing ring and used for scanning a joint of the two to-be-welded plates. The stability of the two to-be-welded plates in the cleaning, preheating, scanning and welding processes before welding and after welding can be kept, the displacement probability of the to-be-welded plates is greatly reduced, and the welding effect is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of welding, and in particular to a welding robot arm for intelligent construction. Background Art

[0002] Welding technology in smart construction uses digitalization, automation, and intelligence to improve the accuracy, efficiency, and safety of welding processes. It is widely used in areas such as building steel structures, bridge engineering, and prefabricated buildings. In smart construction, welding robotic arms replace traditional manual welding, enabling welding path planning and automatic parameter adjustment, reducing human error and improving welding quality consistency. Examples include welding robotic arms disclosed in prior art publications CN119187873B and CN116604243A.

[0003] At present, during the welding process of two plates, the plates are prone to instability during welding due to defects in pre-welding treatment, such as:

[0004] 1. The edges of the grooves after cutting have burrs, waves and other defects, which make it impossible to align the plates tightly during assembly, and cause displacement due to stress release during welding.

[0005] 2. Residual oil, rust or oxide scale in the area of ​​the plate to be welded reduces the friction of the contact surface. During welding, the oil volatilizes under the action of heat to produce gas, which pushes the plate to shift;

[0006] 3. Residual stress generated during the rolling process of raw materials, or improper transportation and stacking leading to plate warping. After forced alignment during assembly, the release of welding thermal stress causes rebound sliding.

[0007] The above problem easily leads to displacement of two plates during welding, which in turn leads to poor welding effect. To address the above problem, the present invention proposes an intelligent construction welding robot arm. Summary of the Invention

[0008] The purpose of the present invention is to provide an intelligent welding robot arm for construction, which can maintain the stability of the two plates to be welded during cleaning, preheating, scanning before welding, welding process, and after welding, greatly reducing the probability of displacement of the plates to be welded and ensuring the welding effect.

[0009] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: a welding robot arm for intelligent construction, comprising a robot arm main body, a welding gun fixed on the robot arm main body, a welding table provided on one side of the robot arm main body, two plates to be welded are placed on the welding table, the welding gun is arranged above the two plates to be welded, a fixing ring is fixed on the outside of the welding gun, and fixing components are fixed on the front and rear sides of the fixing ring for fixing the two plates to be welded during the welding process.

[0010] A preheating and cleaning component is provided on one side of the fixing ring for cleaning and preheating the joint of two plates to be welded.

[0011] A scanning assembly is provided on the other side of the fixing ring for scanning the joints of two plates to be welded.

[0012] Preferably, the fixing assembly includes an electric push rod fixed to the outer wall of the fixing ring, and a support plate is fixed to the piston rod end of the electric push rod, and the support plate is arranged on the top of the plate to be welded; the side of the support plate away from the electric push rod is connected to a wheel shell through multiple movable rods, and a roller is rotatably provided in each wheel shell, so that the roller can fix the plate to be welded from the side, thereby improving the stability of the two plates to be welded.

[0013] Preferably, the support plate is provided with an installation cavity having the same number as the movable rod at one end close to the movable rod, and the movable rod is extended into the installation cavity at one end close to the support plate, and the movable rod is connected to the inner wall of the installation cavity by a spring, and the elastic force of the spring can keep the roller fixed to the side of the plate to be welded.

[0014] Preferably, the bottom end of the support plate is connected to a pressure block through at least one support rod, and the pressure block is arranged at the top of the plate to be welded; the bottom end of the support plate is provided with mounting grooves with the same number as the support rods, and the mounting grooves are arranged on one side of the mounting cavity, and the end of the support rod close to the support plate extends into the mounting groove, and the support rod is connected to the inner wall of the mounting groove by spring 2, so that the pressure block can fix the plate to be welded from the top; two pressure blocks are respectively arranged on the front and back sides of the preheating and cleaning assembly.

[0015] Preferably, the preheating and cleaning assembly includes a shell fixed to one side of the fixing ring through a mounting frame, a heating plate is provided at the bottom of the shell, a metal grinding plate is fixed to the bottom end of the heating plate, the material of the metal grinding plate is aluminum alloy, steel, cast iron, etc., the cross-section of the metal grinding plate is truncated cone-shaped, and the truncated cone-shaped metal grinding plate is convenient for removing impurities adhering to the surface of the plate to be welded.

[0016] Preferably, the mounting frame is provided with a motor fixed to the top of the heating plate, which is used to drive the heating plate and the metal grinding plate to rotate. When the rotating metal grinding plate contacts the weld, it can grind and remove the welding slag on the weld. The top of the inner top of the shell is fixed with an electric cylinder fixed to the top of the motor, which is used to drive the heating plate and the metal grinding plate to rise and fall.

[0017] Preferably, absorption boxes are provided on both sides of the shell, and cleaning cotton is fixed to the bottom end of the absorption box for cleaning the joints of the two plates to be welded; the side of the absorption box close to the shell is fixed to the outer wall of the motor through a sliding rod, and sliding grooves for the sliding rod to pass through are opened on both sides of the shell, and the sliding rod is slidably connected to the sliding groove.

[0018] Preferably, a plurality of absorption ports are provided at the bottom of the outer wall of the absorption box, and a suction pipe is fixed at the top of the absorption box. The suction pipe is connected to the negative pressure device. When the welding slag is removed, the negative pressure device is started to absorb the smaller debris polished off, thereby preventing the smaller debris from floating in the environment and causing harm to human health. At the same time, when absorbing the debris, the air flow at the weld is driven, which is beneficial to cooling the weld after the welding slag is removed and improving the cooling efficiency of the weld.

[0019] Preferably, the scanning assembly includes a scanning camera fixed to the other side of the fixed ring by a bracket, which is used to scan the seam condition. The scanned image is transmitted to the control system of the robotic arm body for analysis so as to plan the subsequent welding path of the robotic arm body.

[0020] Preferably, a vacuum suction cup is fixed on the top of the welding table, and the two plates to be welded are placed on top of the vacuum suction cup, and the vacuum suction cup generates suction to fix the two plates to be welded.

[0021] In the above technical solution, the technical effects and advantages provided by the present invention are:

[0022] 1. The present invention uses the elastic force of the spring and the adsorption effect of the vacuum suction cup to maintain the multi-directional fixation of the two plates to be welded during cleaning, preheating, scanning before welding, welding process, and cleaning welding slag after welding, thereby improving the stability of the plates to be welded, greatly reducing the probability of displacement of the two plates to be welded, and ensuring the welding effect;

[0023] 2. Before welding, the robot arm drives the metal grinding plate and cleaning cotton to move along the joint surface of the plates to be welded, which can remove impurities on the joint surface to the front and back sides of the joint. The two pressing blocks block the impurities outside the joint, thereby preventing impurities from affecting the welding quality. In addition, the two pressing blocks can also block the slag splashed during welding at the joint to prevent the slag from splashing onto nearby personnel and causing harm.

[0024] While cleaning impurities, the metal grinding plate moves, driving the heating plate to move along the joint surface of the plates to be welded. The temperature of the heating plate is transferred to the joint through the metal grinding plate, preheating the joint, increasing the initial temperature of the joint, reducing the tensile stress caused by uneven thermal expansion and contraction during subsequent welding, avoiding excessive stress in local areas due to severe thermal expansion and contraction, and reducing the risk of cracks;

[0025] 3. After welding, the metal grinding plate and cleaning cotton are driven by the main body of the robotic arm to move along the weld. The motor drives the metal grinding plate to rotate to grind and remove the welding slag on the weld. At the same time, the negative pressure equipment connected to the suction pipe is started to suck away the smaller debris ground off, preventing the smaller debris from floating in the environment and causing harm to personnel health. Moreover, when absorbing the debris, it drives the air flow in the weld, which is beneficial to cool the weld after removing the welding slag and improve the cooling efficiency of the weld. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is the overall structural diagram of the present invention;

[0027] Figure 2 This is a structural diagram of the present invention after removing the main body of the robotic arm;

[0028] Figure 3 This is a structural diagram of the welding table and vacuum suction cup of the present invention;

[0029] Figure 4 It is a structural diagram of the welding gun, fixing ring, fixing assembly, preheating and cleaning assembly and scanning assembly of the present invention;

[0030] Figure 5 A side view of the welding gun, retaining ring, retaining assembly, and preheating and cleaning assembly of the present invention;

[0031] Figure 6 is a side sectional view of the fixing assembly of the present invention;

[0032] Figure 7 A bottom view of the fixing assembly of the present invention;

[0033] Figure 8 This is a front and cross-sectional view of the preheating and cleaning component and the scanning component of the present invention.

[0034] Description of reference numerals:

[0035] 1. Robotic arm body, 2. Welding gun, 3. Welding table, 4. Plate to be welded, 5. Fixing ring;

[0036] 6 fixing assembly, 61 electric push rod, 62 support plate, 63 movable rod, 64 wheel housing, 65 roller, 66 mounting cavity, 67 spring 1, 68 support rod, 69 pressure block, 610 mounting slot, 611 spring 2;

[0037] 7 preheating and cleaning components, 71 mounting frame, 72 housing, 73 heating plate, 74 metal grinding plate, 75 motor, 76 electric cylinder, 77 slide bar, 78 absorption box, 79 cleaning cotton, 710 absorption port, 711 straw, 712 chute;

[0038] 8 scanning components, 81 brackets, 82 scanning cameras;

[0039] 9 Vacuum suction cups. DETAILED DESCRIPTION

[0040] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0041] The present invention provides Figures 1-8 The shown embodiment shows an intelligent construction welding robot arm, including a robot arm body 1, a welding gun 2 is fixed on the robot arm body 1, a welding platform 3 is provided on one side of the robot arm body 1, two plates 4 to be welded are placed on the welding platform 3, the welding gun 2 is arranged above the two plates 4 to be welded, a vacuum suction cup 9 is fixed on the top of the welding platform 3, and two plates 4 to be welded are placed on the top of the vacuum suction cup 9. The principle of the vacuum suction cup 9 is to extract the air inside the suction cup through a vacuum pump or a vacuum generator to form a negative pressure, so that the suction cup is adsorbed on the surface of the object, and adsorption and release are achieved by controlling the air pressure. Therefore, the two plates 4 to be welded can be fixed by the vacuum suction cup 9.

[0042] like Figure 1 、 Figure 2 、 Figure 4-Figure 7 As shown, a fixing ring 5 is fixed on the outside of the welding gun 2, and fixing components 6 are fixed on both the front and rear sides of the fixing ring 5 for fixing the two plates 4 to be welded during the welding process; specifically, as shown Figure 4-Figure 7 As shown, the fixing assembly 6 includes an electric push rod 61 fixed to the outer wall of the fixing ring 5, and a support plate 62 is fixed to the piston rod end of the electric push rod 61, and the support plate 62 is arranged on the top of the plate 4 to be welded; the side of the support plate 62 away from the electric push rod 61 is connected to a wheel shell 64 through a plurality of movable rods 63, and each wheel shell 64 is provided with a roller 65 for rotation, so that the roller 65 can fix the plate 4 to be welded from the side, and the end of the support plate 62 close to the movable rod 63 is provided with an installation cavity 66 with the same number as the movable rod 63, and the end of the movable rod 63 close to the support plate 62 extends into the installation cavity 66, and the movable rod 63 is connected to the inner wall of the installation cavity 66 by a spring 67.

[0043] The bottom end of the support plate 62 is connected to a pressure block 69 through at least one support rod 68, and the pressure block 69 is arranged at the top of the plate 4 to be welded; the bottom end of the support plate 62 is provided with mounting grooves 610 with the same number as the support rods 68, and the mounting grooves 610 are arranged on one side of the mounting cavity 66, and the end of the support rod 68 close to the support plate 62 extends into the mounting groove 610, and the support rod 68 is connected to the inner wall of the mounting groove 610 by a second spring 611, so that the pressure block 69 can fix the plate 4 to be welded from the top, thereby improving the stability of the plate 4 to be welded during cleaning, preheating and welding.

[0044] like Figure 1 、 Figure 2 、 Figure 4、 Figure 5 and Figure 8 As shown, a preheating and cleaning component 7 is provided on one side of the fixing ring 5, which is used to clean and preheat the joints of the two plates 4 to be welded, and two pressing blocks 69 are respectively provided on the front and rear sides of the preheating and cleaning component 7; specifically, the preheating and cleaning component 7 includes a shell 72 fixed to one side of the fixing ring 5 by a mounting frame 71, and a heating plate 73 is provided at the bottom of the shell 72. The heating plate 73 is a device that converts electrical energy or other energy into thermal energy for heating objects or maintaining temperature. A metal grinding plate 74 is fixed to the bottom end of the heating plate 73, and the cross-section of the metal grinding plate 74 is a truncated cone, which is convenient for removing impurities adhering to the surface of the plates 4 to be welded, thereby improving the welding quality.

[0045] The mounting frame 71 is provided with a motor 75 fixed to the top of the heating plate 73, which is used to drive the heating plate 73 and the metal grinding plate 74 to rotate. The top of the inner top of the shell 72 is fixed with an electric cylinder 76 fixed to the top of the motor 75, which is used to drive the heating plate 73 and the metal grinding plate 74 to rise and fall, so that the heating plate 73 and the metal grinding plate 74 can contact or separate from the plate 4 to be welded.

[0046] Absorption boxes 78 are also provided on both sides of the outer shell 72. Cleaning cotton 79 for cleaning the joints of the two plates 4 to be welded is fixed to the bottom end of the absorption box 78; the absorption box 78 is fixed to the outer wall of the motor 75 through a slide rod 77 on the side close to the outer shell 72, and a slide groove 712 for the slide rod 77 to pass through is provided on both sides of the outer shell 72, and the slide rod 77 is slidably connected to the slide groove 712, so that the motor 75 can lift and lower the absorption box 78.

[0047] A plurality of absorption ports 710 are provided at the bottom of the outer wall of the absorption box 78, and a suction pipe 711 is fixed to the top of the absorption box 78. The suction pipe 711 is connected to a negative pressure device, which can be a negative pressure pump. The negative pressure generated by the negative pressure device can absorb smaller debris ground off when cleaning the weld, preventing the debris from floating in the environment and causing harm to human health. At the same time, when absorbing debris, it can drive air flow at the weld, thereby improving the cooling efficiency of the weld.

[0048] like Figure 1 、 Figure 2 、 Figure 4 、 Figure 5 and Figure 8 As shown, a scanning component 8 is provided on the other side of the fixed ring 5 for scanning the joints of the two plates 4 to be welded. Specifically, the scanning component 8 includes a scanning camera 82 fixed on the other side of the fixed ring 5 by a bracket 81. The scanning camera 82 is used to scan the joint conditions. The scanned image is transmitted to the control system of the robot body 1 for analysis so as to plan the subsequent welding path of the robot body 1.

[0049] Working principle of the present invention:

[0050] The two plates 4 to be welded are placed on the vacuum suction cup 9 of the welding table 3. The vacuum suction cup 9 adsorbs and fixes the two plates 4 to be welded from the bottom. Then the robot arm body 1 moves the welding gun 2 to drive the fixing ring 5, the fixing assembly 6, the preheating and cleaning assembly 7, and the scanning assembly 8 to move until the welding gun 2 is directly above the joint of the two plates 4 to be welded. At this time, the two pressing blocks 69 are respectively on the surface of the plates 4 to be welded and compress the spring 2 611. The elastic force of the spring 2 611 acts on the plates 4 to be welded through the pressing block 69 to fix the plates 4 to be welded from the top. At the same time, the roller 65 is on the side of the two plates 4 to be welded. Then the electric push rod 61 contracts and drives the support plate 62, the movable rod 63, the wheel shell 64 and the roller 65 to move in the direction close to the plates 4 to be welded until the spring 1 67 is stretched. The elastic force of the spring 1 67 acts on the plates 4 to be welded through the movable rod 63, the wheel shell 64 and the roller 65 to fix the plates 4 to be welded from the side.

[0051] Then, the electric cylinder 76 drives the motor 75, the heating plate 73, the metal grinding plate 74, the slide rod 77 and the absorption box 78 to descend until the metal grinding plate 74 and the cleaning cotton 79 are in contact with the surface of the plate 4 to be welded. Then, the robot arm body 1 drives the welding gun 2 to move from left to right directly above the two plates 4 to be welded and along the seam, driving the metal grinding plate 74 and the cleaning cotton 79 to move along the surface of the seam. The metal grinding plate 74 will remove impurities adhering to the surface of the seam, and the cleaning cotton 79 will remove impurities to the front and back sides of the seam, which is conducive to improving the quality of subsequent welding. At the same time, the heating plate 73 is preheated to the required temperature. When the metal grinding plate 74 moves along the surface of the seam, the temperature of the heating plate 73 is transferred to the seam through the metal grinding plate 74, achieving preheating of the seam to be welded, increasing the initial temperature of the seam, reducing the tensile stress caused by uneven thermal expansion and contraction during subsequent welding, avoiding excessive stress in local areas due to severe thermal expansion and contraction, and reducing the risk of cracks.

[0052] At the same time, the welding gun 2 moves to drive the scanning camera 82 to scan the seam condition, and the scanned image is transmitted to the control system of the robot body 1 for analysis in order to plan the welding path of the robot body 1;

[0053] At the same time, when the welding gun 2 moves along the joint, the fixing assembly 6 also moves accordingly, and the roller 65 moves along the side of the plate 4 to be welded. If the side of the welding plate 4 is not a regular plane, since the roller 65 can slide along the mounting cavity 66, it can keep the roller 65 in close contact with the side of the plate 4 to be welded. At the same time, the pressing block 69 moves along the top of the plate 4 to be welded to keep the plate 4 to be welded fixed. The two pressing blocks 69 can also remove impurities on the front and back sides of the joint with the cleaning cotton 79 and block them outside the joint to prevent impurities from remaining on the joint and affecting the welding quality. In addition, the two pressing blocks 69 can also block the slag splashed during welding at the joint to prevent the slag from splashing onto the surrounding personnel and causing harm to them.

[0054] In summary, the present invention can keep the welding gun 2 fixed in multiple directions on the two plates 4 to be welded during movement through the elastic force of the spring and the adsorption effect of the vacuum suction cup 9, thereby improving the stability of the joints of the plates 4 to be welded during cleaning, preheating and scanning.

[0055] After cleaning, preheating and scanning are completed, the electric cylinder 76 drives the metal grinding plate 74 and the cleaning cotton 79 to rise, so that the metal grinding plate 74 and the cleaning cotton 79 leave the surface of the plate 4 to be welded, and then the welding gun 2 moves from right to left along the joint to weld the joint. During the movement and welding process of the welding gun 2, the spring force and the adsorption effect of the vacuum suction cup 9 keep the two plates 4 to be welded fixed in multiple directions, thereby improving the stability of the plates 4 to be welded during the welding process, greatly reducing the probability of displacement of the two plates 4 to be welded, and ensuring the welding effect.

[0056] After welding is completed, wait for a while (usually 10-30 seconds), and then the electric cylinder 76 drives the metal grinding plate 74 and the cleaning cotton 79 to descend again to contact the weld on the plate 4 to be welded, and then the robot arm body 1 drives the welding gun 2 to move, driving the metal grinding plate 74 and the cleaning cotton 79 to move along the weld, and at the same time start the motor 75 to drive the metal grinding plate 74 to rotate. The metal grinding plate 74 rotates to grind and remove the welding slag on the weld, and at the same time the negative pressure equipment connected to the suction pipe 711 is started, which can suck away the smaller debris ground off through the absorption port 710, the absorption box 78 and the suction pipe 711, so as to prevent the smaller debris from floating in the environment and causing harm to personnel health. At the same time, when absorbing the debris, it drives the air flow at the weld, which is beneficial to cool the weld after removing the welding slag and improve the cooling efficiency of the weld.

[0057] It should be noted that in order to provide power to the heating plate 73, there are wires on the heating plate 73 that are connected to the external power supply. In order to avoid the power cord on the heating plate 73 from being entangled when the motor 75 drives the heating plate 73 to rotate, the motor 75 is preferably a forward and reverse motor. The forward and reverse motor is a motor that can rotate forward and reverse, and is widely used in industries, home appliances, automation equipment and other fields.

[0058] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims.

Claims

1. A welding robot arm for intelligent construction, comprising a robot arm body (1), a welding gun (2) fixed on the robot arm body (1), a welding table (3) provided on one side of the robot arm body (1), two plates (4) to be welded are placed on the welding table (3), and the welding gun (2) is arranged above the two plates (4) to be welded, characterized in that: A fixing ring (5) is fixed on the outside of the welding gun (2), and fixing components (6) are fixed on both the front and rear sides of the fixing ring (5) for fixing the two plates (4) to be welded during the welding process; A preheating and cleaning component (7) is provided on one side of the fixing ring (5) for cleaning and preheating the joint of the two plates (4) to be welded; A scanning assembly (8) is provided on the other side of the fixing ring (5) for scanning the joint conditions of the two plates (4) to be welded.

2. The intelligent construction welding robot arm according to claim 1, characterized in that: The fixing assembly (6) comprises an electric push rod (61) fixed to the outer wall of the fixing ring (5), a support plate (62) is fixed to the piston rod end of the electric push rod (61), and the support plate (62) is arranged on the top of the plate (4) to be welded; The side of the support plate (62) away from the electric push rod (61) is connected to a wheel housing (64) through a plurality of movable rods (63), and a roller (65) is rotatably provided in each wheel housing (64) to facilitate the roller (65) to fix the plate (4) to be welded from the side.

3. The intelligent construction welding robot arm according to claim 2, characterized in that: The support plate (62) is provided with mounting cavities (66) at one end close to the movable rod (63), the number of which is the same as the number of the movable rods (63). The movable rod (63) is extended into the mounting cavity (66) at one end close to the support plate (62), and the movable rod (63) is connected to the inner wall of the mounting cavity (66) via a spring (67).

4. The intelligent construction welding robot arm according to claim 3, characterized in that: The bottom end of the support plate (62) is connected to a pressing block (69) via at least one support rod (68), and the pressing block (69) is arranged on the top end of the plate (4) to be welded; The bottom end of the support plate (62) is provided with mounting grooves (610) having the same number as the support rods (68), and the mounting grooves (610) are provided on one side of the mounting cavity (66). One end of the support rod (68) close to the support plate (62) extends into the mounting groove (610), and the support rod (68) is connected to the inner wall of the mounting groove (610) by a second spring (611), so that the pressing block (69) can be used to fix the plate (4) to be welded from the top. Two pressing blocks (69) are respectively arranged on the front and rear sides of the preheating and cleaning component (7).

5. The intelligent construction welding robot arm according to claim 1, characterized in that: The preheating and cleaning assembly (7) comprises a housing (72) fixed to one side of the fixing ring (5) via a mounting frame (71); a heating plate (73) is provided at the bottom of the housing (72); a metal grinding plate (74) is fixed at the bottom end of the heating plate (73); and the cross section of the metal grinding plate (74) is truncated cone-shaped.

6. The intelligent construction welding robot arm according to claim 5, characterized in that: The mounting frame (71) is provided with a motor (75) fixed to the top of the heating plate (73) for driving the heating plate (73) and the metal grinding plate (74) to rotate. The top of the housing (72) is fixed with an electric cylinder (76) fixed to the top of the motor (75) for driving the heating plate (73) and the metal grinding plate (74) to rise and fall.

7. The intelligent construction welding robot arm according to claim 6, characterized in that: Both sides of the shell (72) are provided with an absorption box (78), and the bottom end of the absorption box (78) is fixed with a cleaning cotton (79) for cleaning the joint of the two plates (4) to be welded; The side of the absorption box (78) close to the shell (72) is fixed to the outer wall of the motor (75) through a slide rod (77). Slide grooves (712) for the slide rod (77) to pass through are provided on both sides of the shell (72), and the slide rod (77) is slidably connected to the slide grooves (712).

8. The intelligent construction welding robot arm according to claim 7, characterized in that: A plurality of absorption ports (710) are provided at the bottom of the outer wall of the absorption box (78), and a suction tube (711) is fixed to the top of the absorption box (78), and the suction tube (711) is connected to the negative pressure device.

9. The intelligent construction welding robot arm according to claim 5, characterized in that: The scanning assembly (8) includes a scanning camera (82) fixed to the other side of the fixing ring (5) via a bracket (81).

10. The intelligent construction welding robot arm according to claim 1, characterized in that: A vacuum suction cup (9) is fixed on the top of the welding table (3), and two plates (4) to be welded are placed on the top of the vacuum suction cup (9).

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