A welding production line

Abstract

The application discloses a welding production line, which comprises a first feeding section, a second feeding section, an assembly welding section and a discharging section arranged in sequence. The first feeding section delivers a lower workpiece to the second feeding section, and the lower workpiece has a bottom plate. The second feeding section delivers a pre-welding assembly workpiece to the assembly welding section, and the pre-welding assembly workpiece comprises the lower workpiece and an upper workpiece stacked on the lower workpiece, and the upper workpiece has a vertical plate. The assembly welding section positions and welds the pre-welding assembly workpiece. A pushing device is arranged at the joint of the first feeding section and the second feeding section, and the pushing device comprises a pushing plate and a first driving device. The pushing plate is used for simultaneously contacting the front ends of the upper workpiece and the lower workpiece, and pushing the pre-welding assembly workpiece to move backward, so as to cooperate with the second feeding section to deliver the pre-welding assembly workpiece, and avoid the size of the product after welding from failing to meet the quality requirement due to the mutual misalignment of the upper workpiece and the lower workpiece in the conveying direction.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of welding, in particular to a welding production line. BACKGROUND

[0002] When the welding production line processes the welding of the bottom plate and the vertical plate, the upper workpiece with the vertical plate is stacked on the lower workpiece with the bottom plate to form a pre-welding assembly workpiece, and then the pre-welding assembly workpiece is conveyed from front to back by using a roller. During the conveying process, the upper workpiece and the lower workpiece are positioned in the left-right direction and the up-down direction by a positioning device, and then welded by a welding device after positioning.

[0003] Taking the welding of H-shaped steel, I-beam, channel steel and angle steel as an example, these shaped steels all involve the welding of the bottom plate and the vertical plate, and the pre-welding feeding section of the welding production line includes a first feeding section and a second feeding section. The first feeding section only conveys the lower workpiece, and after the lower workpiece is conveyed to the second feeding section, the upper workpiece is stacked on the lower workpiece by hoisting to form a pre-welding assembly workpiece, and then the pre-welding assembly workpiece is conveyed by the second feeding section. However, before welding, the vertical plate and the bottom plate are only lapped together, and the two are not fixed as a whole. Therefore, in the second feeding section, the upper workpiece and the lower workpiece are easy to be misaligned with each other in the conveying direction, resulting in that the size of the product after welding does not meet the quality requirements. SUMMARY

[0004] The purpose of the present application is to provide a welding production line, which combines the second feeding section with the pushing device to convey the pre-welding workpiece, so as to avoid the misalignment of the upper workpiece and the lower workpiece in the conveying direction, which leads to the size of the product after welding not meeting the quality requirements.

[0005] To achieve the above-mentioned purpose, the present application provides the following solutions:

[0006] The present application discloses a welding production line, which comprises a first feeding section, a second feeding section, an assembly welding section and a discharging section arranged in sequence from front to back, the first feeding section is used for conveying a lower workpiece to the second feeding section, the lower workpiece has a bottom plate, the second feeding section is used for conveying a pre-welding assembly workpiece to the assembly welding section, the pre-welding assembly workpiece comprises the lower workpiece and an upper workpiece stacked on the lower workpiece, the upper workpiece has a vertical plate, and the assembly welding section is used for positioning and welding the pre-welding assembly workpiece.

[0007] The pusher device is provided at the joint of the first feeding section and the second feeding section, and comprises a pusher plate and a first driving device for driving the pusher plate to reciprocate in the front-rear direction; the pusher plate can avoid the lower workpiece not bearing the upper workpiece to allow the lower workpiece to enter the second feeding section from the first feeding section; the pusher plate is used to simultaneously contact the front ends of the upper workpiece and the lower workpiece and push the pre-welding assembly workpiece to move backward to match the second feeding section to transport the pre-welding assembly workpiece.

[0008] Preferably, the pusher device further comprises a second driving device for driving the pusher plate to move to avoid the lower workpiece not bearing the upper workpiece.

[0009] Preferably, the second driving device comprises a rotating shaft, a plate frame, a swing arm and an extension device; the rotating shaft is rotatably installed on the plate frame and fixedly connected with the pusher plate; the swing arm is fixed on the rotating shaft; the first end of the extension device is rotatably connected with the plate frame; and the second end of the extension device is rotatably connected with a position of the swing arm deviating from the axis of the rotating shaft; the first driving device is connected with the plate frame to drive the plate frame to reciprocate in the front-rear direction.

[0010] Preferably, the device further comprises a positioning baffle for positioning the rear end of the pre-welding assembly workpiece; the positioning baffle is located at the rear side of the pusher plate; the front side of the positioning baffle is used to contact and limit the rear end of the upper workpiece and the lower workpiece; and the position of the positioning baffle can be adjusted to avoid the pre-welding assembly workpiece.

[0011] Preferably, the assembly welding section comprises an assembly machine and a welding device; the assembly machine is used to position the pre-welding assembly workpiece in the up-down and left-right directions; and the welding device is used to weld the pre-welding assembly workpiece positioned by the assembly machine.

[0012] Preferably, the assembly machine comprises an assembly frame, a third conveying device, an upper side pressing device, a lower side pressing device, at least two vertical plate pressing devices and at least two first bottom plate pressing devices installed on the assembly frame; the third conveying device is used to convey the pre-welding assembly workpiece from front to back; the upper side pressing device is used to press the upper workpiece from the upper side; the lower side pressing device is used to press the lower workpiece from the lower side; at least two vertical plate pressing devices are respectively located at the left and right sides of the third conveying device to respectively press the vertical plate from the left and right sides; and at least two first bottom plate pressing devices are respectively located at the left and right sides of the bottom plate to respectively press the bottom plate from the left and right sides.

[0013] Preferably, the second feeding section comprises a second conveying device, at least two second bottom plate pressing devices and at least two vertical plate pressing devices; the at least two second bottom plate pressing devices are respectively located on the left and right sides of the second conveying device, and are used for pressing the bottom plate from the left and right sides respectively; the at least two vertical plate pressing devices are respectively located on the left and right sides of the second conveying device, and are used for pressing the vertical plate from the left and right sides.

[0014] Preferably, the first feeding section comprises a first conveying device and at least two second bottom plate pressing devices; the at least two second bottom plate pressing devices are respectively located on the left and right sides of the first conveying device, and are used for pressing the bottom plate from the left and right sides.

[0015] Preferably, the vertical plate pressing device comprises a first roller, a first roller frame and a first displacement device, the first roller is used for rolling contact with the left side surface or the right side surface of the vertical plate, the first roller is rotatably installed on the first roller frame, and the first displacement device is used for moving the first roller frame in the left-right direction; the first bottom plate pressing device comprises a sixth roller, a sixth roller frame and a sixth displacement device, the sixth roller is used for rolling contact with the left side edge or the right side edge of the bottom plate, the sixth roller is rotatably installed on the sixth roller frame, and the sixth displacement device is used for moving the sixth roller frame in the left-right direction; the second bottom plate pressing device comprises a second roller, a second roller frame and a second displacement device, the second roller is used for rolling contact with the left side edge or the right side edge of the bottom plate, the second roller is rotatably installed on the second roller frame, and the second displacement device is used for moving the second roller frame in the left-right direction; the upper side pressing device comprises a third roller, a third roller frame and a third displacement device, the third roller is used for rolling contact with the upper surface of the upper side workpiece, the third roller is rotatably installed on the third roller frame, and the third displacement device is used for moving the third roller frame in the up-down direction; the lower side pressing device comprises a fourth roller, a fourth roller frame and a fourth displacement device, the fourth roller is used for rolling contact with the lower surface of the lower side workpiece, the fourth roller is rotatably installed on the fourth roller frame, and the fourth displacement device is used for moving the fourth roller frame in the up-down direction.

[0016] Preferably, the group assembly welding section further comprises at least four bottom plate pressing devices, wherein at least two of the bottom plate pressing devices are respectively used to press the left side edge and the right side edge of the upper surface of the bottom plate before welding, and at least two of the bottom plate pressing devices are respectively used to press the left side edge and the right side edge of the upper surface of the bottom plate after welding; the bottom plate pressing device comprises a fifth roller, a fifth roller carrier, a lifting device and a fifth displacement device, the fifth roller is used to roll in contact with the left side edge or the right side edge of the upper surface of the bottom plate, the fifth roller is rotatably installed on the fifth roller carrier, the fifth roller carrier is connected with the lifting device, and the fifth displacement device is used to move the fifth roller carrier lifting device in the left-right direction.

[0017] Preferably, the welding equipment comprises guide rails, a movable gantry, a welding robot and a welding machine; the guide rails comprise two and are arranged in the front-rear direction, and the two guide rails are respectively located on the left and right sides of the assembly machine; the movable gantry comprises a cross beam, two columns and a gantry driving device; the lower ends of the two columns are respectively slidably arranged on the two guide rails, the two ends of the cross beam are respectively connected with the upper ends of the two columns, and the gantry driving device is used to drive at least one of the columns to slide on the guide rail; the welding robot is installed on the cross beam, and the welding machine is installed on the welding robot.

[0018] Preferably, the welding equipment further comprises a cross slide installed on the cross beam, the welding robot is installed on the cross slide, and the sliding direction of the cross slide is the up-down direction and the left-right direction.

[0019] Preferably, it further comprises a laser welding protective fence enclosing the inside of the welding equipment; the laser welding protective fence is provided with a safety door, and the welding production line stops working when the safety door is opened.

[0020] Preferably, the welding machine comprises a laser welding machine, the laser welding machine comprises a fiber laser and a laser welding head, the laser welding head is connected with the fiber laser, and the laser welding head is installed on the welding robot.

[0021] Preferably, the welding robot comprises a first welding robot and a second welding robot; the first welding robot is provided with a quick-change device, the quick-change device is used to install the laser welding head with a power of 10 kW or the laser welding head with a power of 20 kW; the second welding robot is provided with the laser welding head with a power of 10 kW; the laser welding heads on the first welding robot and the second welding robot are connected with the same fiber laser.

[0022] Preferably, the welding machine further comprises an arc welding machine, the arc welding machine comprising a welding torch mounted on the welding robot.

[0023] The present application has the following technical effects relative to the prior art:

[0024] The pushing device is arranged at the joint of the first feeding section and the second feeding section, and comprises a pushing plate and a first driving device for driving the pushing plate to reciprocate in the front-rear direction. The pushing plate can avoid the lower side workpiece that is not loaded with the upper side workpiece, so as to allow it to pass. After the lower side workpiece passes the pushing plate, the upper side workpiece is stacked on the lower side workpiece to form a combined assembly workpiece before welding. The pushing plate is used to simultaneously contact the front ends of the upper side workpiece and the lower side workpiece, and push the combined assembly workpiece before welding to move backward, so as to cooperate with the second feeding section to transport the combined assembly workpiece before welding. During the transportation process, since the pushing plate simultaneously contacts the front ends of the upper side workpiece and the lower side workpiece, the upper side workpiece and the lower side workpiece can be prevented from being misaligned in the transportation direction, the combined positioning size of the product is ensured, and the product quality after welding is improved. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor based on these drawings.

[0026] Figure 1 It is a schematic diagram of the overall structure of the welding production line of the present embodiment;

[0027] Figure 2 It is a schematic diagram of the overall structure of the welding production line of the present embodiment; Figure 1 It is a schematic diagram of the structure after omitting the laser welding protective fence;

[0028] Figure 3 It is a schematic diagram of the structure of the first feeding section;

[0029] Figure 4 It is a schematic diagram of the structure of the second feeding section;

[0030] Figure 5 It is a schematic diagram of the structure of the pushing device from one perspective;

[0031] Figure 6 It is a schematic diagram of the structure of the pushing device from another perspective;

[0032] Figure 7 It is a schematic diagram of the structure of the assembling machine;

[0033] Figure 8 It is a schematic diagram of the structure of the welding equipment;

[0034] Figure 9 Fig. 8 is a schematic view of the position relationship between the positioning device and the assembling machine; Figure 8 Fig. 9 is a schematic view of the structure after the guide rail is omitted;

[0035] Figure 10 Fig. 10 is a schematic view of the position relationship between the positioning device and the assembling machine;

[0036] Figure 11 Fig. 11 is a schematic view of the position relationship between the workpiece and the vertical plate pressing device before welding;

[0037] Figure 12 Fig. 12 is a schematic view of the position relationship between the workpiece and the vertical plate pressing device before welding;

[0038] Figure 13 Fig. 13 is a schematic view of the structure of the vertical plate pressing device;

[0039] Figure 14 Fig. 14 is a schematic view of the structure of the second bottom plate pressing device;

[0040] Figure 15 Fig. 15 is a schematic view of the position relationship between the upper side pressing device and the lower side pressing device;

[0041] Figure 16 Fig. 16 is a schematic view of the structure of the bottom plate pressing device;

[0042] Figure 17 Fig. 17 is a schematic view of the structure of the first bottom plate pressing device;

[0043] Explanation of reference signs: 100 welding production line; 1 first feeding section; 11 first conveying device; 2 second feeding section; 21 second conveying device; 3 group welding section; 31 group erecting machine; 311 group erecting frame; 312 third conveying device; 313 upper side pressing device; 3131 third roller; 3132 third wheel frame; 3133 third displacement device; 314 lower side pressing device; 3141 fourth roller; 3142 fourth wheel frame; 3143 fourth displacement device; 32 welding equipment; 321 guide rail; 322 movable gantry; 323 welding robot; 324 welding machine; 325 cross slide; 33 bottom plate pressing device; 331 fifth roller; 332 fifth wheel frame; 333 fifth displacement device; 334 lifting device; 4 blanking section; 5 pushing device; 51 pushing plate; 52 first driving device; 53 second driving device; 531 rotating shaft; 532 plate frame; 533 swing arm; 534 telescopic device; 6 positioning baffle; 7 laser welding protective fence; 8 pre-welding combined assembly workpiece; 81 upper side workpiece; 82 lower side workpiece; 9 ground; A vertical plate pressing device; A1 first roller; A2 first wheel frame; A21 slot; A3 first displacement device; B second bottom plate pressing device; B1 second roller; B2 second wheel frame; B3 second displacement device; C first bottom plate pressing device; C1 sixth roller; C2 sixth wheel frame; C3 sixth displacement device. DETAILED DESCRIPTION

[0044] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0045] The purpose of the present application is to provide a welding production line, which combines the second feeding section with the pushing device to convey the pre-welding workpiece, so as to avoid the size of the product after welding from failing to meet the quality requirements due to the misalignment of the upper side workpiece and the lower side workpiece in the conveying direction.

[0046] In order to make the above-mentioned purposes, characteristics and advantages of the present application more apparent and easy to understand, the present application will be further described in detail below with reference to the drawings and specific embodiments. For the convenience of describing the embodiments mentioned herein, the front, back, left, right, up and down are introduced as the reference coordinate system. The direction description is intended to express the structural characteristics of the parts themselves or the relative positional relationship between the parts, rather than to restrict the absolute positional relationship. In the drawings, the positive direction of the x-axis is forward, the negative direction of the x-axis is backward (i.e. the conveying direction), the positive direction of the y-axis is left, the negative direction of the y-axis is right, the positive direction of the z-axis is up, and the negative direction of the z-axis is down.

[0047] Reference will be made toFigures 1-2 The embodiment provides a welding production line 100, which comprises a first feeding section 1, a second feeding section 2, an assembly welding section 3 and a discharging section 4 arranged in sequence from front to back. The first feeding section 1 is used for conveying a lower workpiece 82 to the second feeding section 2, and the lower workpiece 82 has a bottom plate. The second feeding section 2 is used for conveying a pre-welding assembly workpiece 8 to the assembly welding section 3, and the pre-welding assembly workpiece 8 comprises the lower workpiece 82 and an upper workpiece 81 stacked on the lower workpiece 82, and the upper workpiece 81 has a vertical plate. The assembly welding section 3 is used for positioning the pre-welding assembly workpiece 8 and welding the pre-welding assembly workpiece 8.

[0048] The first feeding section 1 and the second feeding section 2 are further provided with a pushing device 5 at the joint, and the pushing device 5 comprises a pushing plate 51 and a first driving device 52. The first driving device 52 is used for driving the pushing plate 51 to reciprocate in the front-rear direction. The pushing plate 51 can avoid the lower workpiece 82 without the upper workpiece 81, so as to allow the lower workpiece 82 without the upper workpiece 81 to enter the second feeding section 2 from the first feeding section 1. The pushing plate 51 is used for simultaneously contacting the front ends of the upper workpiece 81 and the lower workpiece 82 and pushing the pre-welding assembly workpiece 8 to move backward, so as to cooperate with the second feeding section 2 to convey the pre-welding assembly workpiece 8. Here, the "cooperate" means that the movement speed of the pushing plate 51 should not be less than the conveying speed of the second feeding section 2 when the pushing plate 51 pushes the pre-welding assembly workpiece 8 to move backward, so that the pushing plate 51 does not separate from the front ends of the upper workpiece 81 and the lower workpiece 82, and the pre-welding assembly workpiece 8 is conveyed by the pushing device 5 and the second feeding section 2 together, thereby ensuring the relative position of the upper workpiece 81 and the lower workpiece 82 in the conveying direction.

[0049] In use, the second feeding section 2 and the pushing plate 51 cooperate to convey the pre-welding assembly workpiece 8. During the conveying process, since the pushing plate 51 simultaneously contacts the front ends of the upper workpiece 81 and the lower workpiece 82, the upper workpiece 81 and the lower workpiece 82 can be prevented from being misaligned in the conveying direction, the product assembly positioning size is ensured, and the product quality after welding is improved.

[0050] Reference Figures 5-6 In the embodiment, the first driving device 52 is a hydraulic cylinder. One end of the hydraulic cylinder is fixed, and the other end is directly or indirectly connected with the pushing plate 51. When the hydraulic cylinder acts, the length of the hydraulic cylinder changes, thereby driving the pushing plate 51 to reciprocate in the front-rear direction. However, the actual implementation mode is not limited to the example. For example, the first driving device 52 can also be an electric telescopic rod, a gear and rack driving device, etc., which is not limited here.

[0051] Reference Figures 5-6In the embodiment, the pushing device 5 further comprises a second driving device 53, which is used to drive the pushing plate 51 to move to avoid the lower workpiece 82 which does not bear the upper workpiece 81. The second driving device 53 can change the position of the pushing plate 51 by translating, rotating or a combination of translating and rotating, so as to avoid the lower workpiece 82. However, the actual implementation is not limited to the example. For example, the upper end of the pushing plate 51 can be rotatably connected to the other end of the hydraulic cylinder. When the lower workpiece 82 moves backward, the lower workpiece 82 pushes the pushing plate 51 to rotate in a direction (referred to as a forward direction), and when the lower workpiece 82 passes through the pushing plate 51, the pushing plate 51 rotates reversely (opposite to the forward direction) under the action of gravity to reset. Moreover, a limiting block is arranged to limit the pushing plate 51, so that the pushing plate 51 cannot rotate reversely to a certain position, so as to push the pre-welding assembly workpiece 8 backward by the pushing plate 51.

[0052] With reference to Figures 5-6 In the embodiment, the second driving device 53 rotates the pushing plate 51 to avoid the lower workpiece 82. Specifically, the second driving device 53 comprises a rotating shaft 531, a plate frame 532, a swing arm 533 and a telescopic device 534. The rotating shaft 531 is rotatably installed on the plate frame 532 and fixedly connected with the pushing plate 51, the swing arm 533 is fixed on the rotating shaft 531, the first end of the telescopic device 534 is rotatably connected with the plate frame 532, and the second end of the telescopic device 534 is rotatably connected with the swing arm 533 at a position deviating from the axis of the rotating shaft 531. The first driving device 52 is connected with the plate frame 532 to drive the plate frame 532 to reciprocate in the front-back direction and drive the pushing plate 51 to move in the front-back direction. The plate frame 532 is preferably installed on a slide rail, and the length direction of the slide rail is the front-back direction, so that the plate frame 532 is guided when the first driving device 52 drives the plate frame 532 to move. When the telescopic device 534 acts, the length of the telescopic device 534 changes, thereby driving the swing arm 533, the rotating shaft 531 and the pushing plate 51 to rotate. The telescopic device 534 can be a hydraulic cylinder, an air cylinder or an electric telescopic rod, which is not limited here.

[0053] With reference to Figure 10 Before the pre-welding assembly workpiece 8 is pushed backward by the pushing plate 51, the upper workpiece 81 and the lower workpiece 82 are positioned in the conveying direction in the embodiment. Specifically, the welding production line 100 of the embodiment further comprises a positioning baffle 6 arranged at the rear end of the welding production line 100 and used to position the pre-welding assembly workpiece 8. Figure 1 and Figure 2The positioning baffle is located at the rear side of the pushing plate 51, and the front side of the positioning baffle is used to limit the rear end of the upper workpiece 81 and the lower workpiece 82 to form the pre-welding assembly workpiece 8. The position of the positioning baffle 6 can be adjusted to avoid the pre-welding assembly workpiece 8. The position of the positioning baffle 6 can be adjusted in various ways, and those skilled in the art can choose flexibly according to the needs. In the embodiment, the positioning baffle 6 is bolted to the assembly machine 31, and after the bolts are loosened, the positioning baffle 6 can be rotated to avoid the pre-welding assembly workpiece 8. However, the actual implementation is not limited to the example. For example, those skilled in the art can also provide baffle driving devices for driving the positioning baffle 6 to move. The baffle driving device can be a hydraulic cylinder, an air cylinder, an electric push rod, etc., which can make the positioning baffle avoid the pre-welding assembly workpiece 8 by rotating or translating. As a preferred embodiment, the front side of the positioning baffle is a plane to align the upper workpiece 81 and the lower workpiece 82.

[0054] Referring to Figures 1-2 In the embodiment, the assembly welding section 3 includes an assembly machine 31 and a welding device 32. The assembly machine 31 is used to position the pre-welding assembly workpiece 8 in the up-down and left-right directions, and the welding device 32 is used to weld the pre-welding assembly workpiece 8 positioned by the assembly machine 31. In the prior art, there are various assembly machines 31 and welding devices 32, and those skilled in the art can set them according to the needs.

[0055] Referring to Figure 7 In the embodiment, the assembly machine 31 includes an assembly frame 311, a third conveying device 312, an upper side pressing device 313, a lower side pressing device 314, at least two vertical plate pressing devices A, and at least two first bottom plate pressing devices C installed on the assembly frame 311. The third conveying device 312 is used to convey the pre-welding assembly workpiece 8 from front to back. The upper side pressing device 313 is used to press the upper workpiece 81 from the upper side, and the lower side pressing device 314 is used to press the lower workpiece 82 from the lower side, so that the upper surface of the bottom plate and the lower surface of the vertical plate are tightly in place, and the gap between the bottom plate and the vertical plate meets the welding requirements, facilitating subsequent welding work. The at least two vertical plate pressing devices A are respectively located on the left and right sides of the third conveying device 312, and are used to press the vertical plate from the left and right sides to center the vertical plate. The at least two first bottom plate pressing devices C are respectively located on the left and right sides of the bottom plate, and are used to press the bottom plate from the left and right sides to center the bottom plate. In the embodiment, the baffle driving device is installed on the assembly frame 311, and those skilled in the art can also select other installation positions according to the needs.

[0056] Referring to Figure 4In the embodiment, the second feeding section 2 comprises a second conveying device 21, at least two second bottom plate pressing devices B and at least two vertical plate pressing devices A. The at least two second bottom plate pressing devices B are respectively located on the left and right sides of the second conveying device 21, and are used for pressing the bottom plate from the left and right sides respectively, so as to center the bottom plate. The at least two vertical plate pressing devices A are respectively located on the left and right sides of the second conveying device 21, and are used for pressing the vertical plate from the left and right sides, so as to center the vertical plate.

[0057] With reference to Figure 3 In the embodiment, the first feeding section 1 comprises a first conveying device 11 and at least two second bottom plate pressing devices B. The at least two second bottom plate pressing devices B are respectively located on the left and right sides of the first conveying device 11, and are used for pressing the bottom plate from the left and right sides, so as to center the bottom plate.

[0058] With reference to Figures 13-15 and Figure 17In the embodiment, the vertical plate pressing device A comprises a first roller A1, a first roller frame A2 and a first displacement device A3. The first roller A1 is used for rolling contact with the left side or the right side of the vertical plate. The first roller A1 is rotatably installed on the first roller frame A2. The first displacement device A3 is used for moving the first roller frame A2 in the left-right direction. The first bottom plate pressing device C comprises a sixth roller C1, a sixth roller frame C2 and a sixth displacement device C3. The sixth roller C1 is used for rolling contact with the left edge or the right edge of the bottom plate. The sixth roller C1 is rotatably installed on the sixth roller frame C2. The sixth displacement device C3 is used for moving the sixth roller frame C2 in the left-right direction. The second bottom plate pressing device B comprises a second roller B1, a second roller frame B2 and a second displacement device B3. The second roller B1 is used for rolling contact with the left edge or the right edge of the bottom plate. The second roller B1 is rotatably installed on the second roller frame B2. The second displacement device B3 is used for moving the second roller frame B2 in the left-right direction. The upper side pressing device 313 comprises a third roller 3131, a third roller frame 3132 and a third displacement device 3133. The third roller 3131 is used for rolling contact with the upper surface of the upper side workpiece 81. The third roller 3131 is rotatably installed on the third roller frame 3132. The third displacement device 3133 is used for moving the third roller frame 3132 in the up-down direction. In the embodiment, the upper side pressing device 313 comprises three third rollers 3131. The three third rollers 3131 are installed on the same third roller frame 3132 and are sequentially arranged in the front-rear direction, so as to uniformly press the upper side workpiece 81 downward, thereby avoiding the problem of local lifting of the workpiece when the workpiece is pressed downward by a single third roller 3131, the problem of affecting the welding quality due to the large gap between the upper side workpiece 81 and the lower side workpiece 82 at the welding position caused by uneven pressing, and the problem of unstable contact between the lower side workpiece 82 and the third conveying device 312 caused by lifting of the lower side workpiece 82. The lower side pressing device 314 comprises a fourth roller 3141, a fourth roller frame 3142 and a fourth displacement device 3143. The fourth roller 3141 is used for rolling contact with the lower surface of the lower side workpiece 82. The fourth roller 3141 is rotatably installed on the fourth roller frame 3142. The fourth displacement device 3143 is used for moving the fourth roller frame 3142 in the up-down direction.

[0059] With reference to Figure 16In the embodiment, the assembly welding section 3 further comprises at least four bottom plate pressing devices 33. At least two of the bottom plate pressing devices 33 are located at the front side of the assembly machine 31 and are respectively used for pressing the left side edge and the right side edge of the upper surface of the bottom plate before welding. At least two of the bottom plate pressing devices 33 are located at the rear side of the assembly machine 31 and are respectively used for pressing the left side edge and the right side edge of the upper surface of the bottom plate after welding. The bottom plate pressing device 33 comprises a fifth roller 331, a fifth roller frame 332, a lifting device 334 and a fifth displacement device 333. The fifth roller 331 is used for rolling contact with the left side edge or the right side edge of the upper surface of the bottom plate. The fifth roller 331 is rotatably installed on the fifth roller frame 332. The fifth roller frame 332 is connected with the lifting device 334. The lifting device 334 moves the fifth roller frame 332 in the up-down direction. The fifth displacement device 333 is used for moving the lifting device 334 in the left-right direction. By pressing the bottom plate before and after welding, the upward deformation of the bottom plate can be prevented. The lifting device 334 can be a hydraulic cylinder or other types as long as it can realize the lifting function.

[0060] The first displacement device A3, the second displacement device B3, the third displacement device 3133, the fourth displacement device 3143 and the fifth displacement device 333 can respectively adjust the positions of the first roller A1, the second roller B1, the third roller 3131, the fourth roller 3141 and the fifth roller 331 according to needs, adapt to bottom plates of different widths and thicknesses and vertical plates of different heights and thicknesses, and meet the positioning and clamping needs and the shape correction needs of different types of workpieces such as H-shaped steel, channel steel, I-beam and angle steel, so as to realize the flexible positioning and clamping function and the shape correction function.

[0061] In the embodiment, the specific types of the first displacement device A3, the second displacement device B3, the third displacement device 3133, the fourth displacement device 3143, the fifth displacement device 333 and the sixth displacement device C3 can be selected by those skilled in the art according to actual needs, such as a hydraulic drive device, a lead screw and nut drive device and other types of displacement devices, as long as they can drive the corresponding roller frame to adjust the position to adapt to different steel shapes.

[0062] In the embodiment, the first roller A1 of the vertical plate pressing device A comprises a large roller and a small roller. The first roller frame A2 comprises a large roller frame and a small roller frame. The first displacement device A3 comprises a large roller frame displacement device and a small roller frame displacement device. The large roller is rotatably installed on the large roller frame. The large roller frame displacement device is used for moving the large roller frame in the left-right direction. The small roller is rotatably installed on the small roller frame. The small roller frame displacement device is used for moving the small roller frame in the left-right direction. The small roller is located on the upper side of the large roller. The large roller and the small roller can respectively roll in contact with different heights of the vertical plate to adapt to different steel shapes.

[0063] In the embodiment, the small wheel carrier includes a base and a sliding block, and the small wheel is rotatably installed on the sliding block. The sliding block is fixedly connected to the base by a screw. The sliding block is provided with a strip-shaped hole A21 for the screw to pass through, and the strip-shaped hole A21 is vertically arranged. After the screw is loosened, the sliding block can slide in the vertical direction relative to the base. By adjusting the position of the screw in the strip-shaped hole A21, the height of the sliding block and the small wheel can be changed to adapt to different specifications of the profile steel.

[0064] With reference to Figures 8-9 In the embodiment, the welding device 32 includes guide rails 321, a movable gantry 322, a welding robot 323, and a welding machine 324. The guide rails 321 include two guide rails arranged in the front-rear direction and located on the left and right sides of the assembling machine 31. The movable gantry 322 includes a cross beam, two columns, and a gantry driving device. The lower ends of the two columns are slidably arranged on the two guide rails 321, the two ends of the cross beam are connected to the upper ends of the two columns, and the gantry driving device is used to drive at least one column to slide on the guide rail 321. The welding robot 323 is installed on the cross beam, and the welding machine 324 is installed on the welding robot 323. When the welding device 32 is working, the position of the movable gantry 322 on the guide rail 321 can be adjusted, so that the front-rear position of the welding robot 323 can be changed. However, the actual implementation is not limited to the example. For example, the welding device 32 can also not include the guide rail 321, and the movable gantry 322 can be replaced by a fixed gantry.

[0065] The welding robot 323 is usually provided with a full-digital non-contact laser welding seam tracking system, which can accurately identify the welding seam and complete closed-loop control by the welding seam tracking system. When there is a positioning error of the incoming material and a positioning error of the clamp, the welding seam position can be calculated according to the appearance of the workpiece and the specific features of the joint, so that accurate welding can be realized. The welding robot 323 can call corresponding welding programs according to the material, specifications and models of the workpiece.

[0066] With reference to Figure 9 In the embodiment, the welding device 32 further includes a cross slide 325 installed on the cross beam, the welding robot 323 is installed on the cross slide 325, and the sliding direction of the cross slide 325 is the up-down direction and the left-right direction. The position of the welding robot 323 in the left-right direction and the up-down direction can be adjusted by the cross slide 325.

[0067] With reference to Figure 1 In order to improve safety, the embodiment further includes a laser welding protective fence 7 surrounding the welding device 32 on the inside. The laser welding protective fence 7 is provided with a safety door (not shown) and a safety door lock (not shown). Figure 1When the safety door is opened, the welding production line 100 stops working. The safety door controls the welding production line 100 to stop working in various ways. For example, a circuit switch is arranged on the safety door, the circuit switch is connected to the power supply of the welding production line 100, and when the safety door is opened, the circuit switch is disconnected, so that the welding production line 100 is powered off. In the embodiment, the safety door is connected with a signal acquisition device for monitoring the opening and closing state of the safety door, the signal acquisition device is electrically connected with the controller, and the controller controls the actions of the first feeding section, the second feeding section, the assembly welding section and the discharging section.

[0068] In the embodiment, the welding machine 324 includes a laser welding machine, the laser welding machine includes a fiber laser and a laser welding head, the laser welding head is connected with the fiber laser, and the laser welding head is installed on the welding robot 323. Compared with the traditional welding method, the laser welding has the advantages of high energy density and deep penetration.

[0069] In the embodiment, the welding robot 323 includes a first welding robot and a second welding robot, and the first welding robot and the second welding robot can simultaneously weld from the left and right sides of the pre-welding assembly and assembly workpiece 8. The first welding robot is installed with a quick-change device, and the quick-change device is used to install a laser welding head with a power of 10 kW or a laser welding head with a power of 20 kW, and different power laser welding heads can be selected as needed. The second welding robot is installed with a laser welding head with a power of 10 kW. The laser welding heads on the first welding robot and the second welding robot are connected with the same fiber laser, and the fiber laser has the functions of time sharing and energy sharing. When symmetrical welding is needed on both sides of the pre-welding assembly and assembly workpiece 8, the laser welding heads with a power of 10 kW on the first welding robot and the second welding robot can be simultaneously started. When high-power welding is needed on one side of the pre-welding assembly and assembly workpiece 8, the laser welding head with a power of 20 kW on the first welding robot can be started.

[0070] In the embodiment, the welding machine 324 also includes an electric arc welding machine, and the electric arc welding machine includes a welding gun installed on the welding robot 323. By combining laser welding with electric arc welding, four different welding processes can be realized, including laser self-melting welding, laser wire filling welding, laser-arc hybrid welding and electric arc welding. The laser-arc hybrid welding combines the advantages of laser welding and electric arc welding, has enhanced bridging capability, improved structure, lower gap requirement for the weld, compared with laser welding. Compared with electric arc welding, the laser-arc hybrid welding has high welding speed, large penetration depth, small deformation, and does not need (or rarely needs) to open a groove, and has the advantages of various heat sources and the disadvantages of each other.

[0071] In the embodiment, the transition conveying device is arranged below the pushing plate 51 and between the first conveying device 11 and the second conveying device 21. Those skilled in the art can also not arrange the transition conveying device, but arrange the pushing plate 51 on a section of the first conveying device 11 at the rear or the second conveying device 21 at the front, without arranging the vertical plate pressing device A and the second bottom plate pressing device B, so as to avoid collision between the plate frame 532 and the vertical plate pressing device A or the second bottom plate pressing device B when the plate frame 532 moves.

[0072] In the embodiment, the unloading section 4 comprises the fourth conveying device and at least two second bottom plate pressing devices B. The at least two second bottom plate pressing devices B are respectively arranged on the left and right sides of the fourth conveying device, and are used to press the bottom plate from the left and right sides, so as to center the bottom plate. Since the upper workpiece 81 and the lower workpiece 82 become an integral whole after welding, it is only necessary to center and limit one of the bottom plate and the vertical plate. However, the actual implementation is not limited to the example. For example, when the post-weld workpiece does not need to be centered, those skilled in the art can also make the unloading section 4 only comprise the fourth conveying device.

[0073] It should be noted that in the embodiment, the first conveying device 11, the second conveying device 21, the third conveying device 312, the fourth conveying device and the transition conveying device are all conveying roller beds, and those skilled in the art can also select other types of conveying devices according to actual needs, for example, a conveying belt. When the fourth conveying device is a conveying belt, the fourth roller 3141 is in rolling contact with the conveying belt, thereby indirectly pressing the upper workpiece 81 and the lower workpiece 82 upward.

[0074] Referring to Figures 11-12 , Figure 11 is a schematic view of the positional relationship between the pre-weld assembly workpiece 8 and the vertical plate pressing device A when welding an angle steel, Figure 12 is a schematic view of the positional relationship between the pre-weld assembly workpiece 8 and the vertical plate pressing device A when welding an H-shaped steel. Figure 11 The pre-weld assembly workpiece 8 of the embodiment is an H-shaped steel, and the upper workpiece 81 is a vertical plate and the lower workpiece 82 is a bottom plate. Figure 12 The pre-weld assembly workpiece 8 of the embodiment is an H-shaped steel, and the upper workpiece 81 is a vertical plate and the lower workpiece 82 is a bottom plate.

[0075] The principles and implementation manners of the present application are described in the specification by using specific examples, and the above examples are only used to help understand the method of the present application and its core idea; meanwhile, for those skilled in the art, according to the idea of the present application, the specific implementation manners and application ranges will be changed. In conclusion, the content of the specification should not be understood as a limitation of the present application.

Claims

1. A welding production line, comprising a first feeding section (1), a second feeding section (2), an assembly welding section (3) and a discharging section (4) arranged in sequence from front to back, the first feeding section (1) is used for conveying a lower workpiece (82) to the second feeding section (2), the lower workpiece (82) has a bottom plate, the second feeding section (2) is used for conveying a pre-welding assembly workpiece (8) to the assembly welding section (3), the pre-welding assembly workpiece (8) comprises the lower workpiece (82) and an upper workpiece (81) stacked on the lower workpiece (82), the upper workpiece (81) has a vertical plate, and the assembly welding section (3) is used for positioning and welding the pre-welding assembly workpiece (8), characterized in that: a pushing device (5) is further arranged at the joint of the first feeding section (1) and the second feeding section (2), the pushing device (5) comprises a pushing plate (51) and a first driving device (52), the first driving device (52) is used for driving the pushing plate (51) to reciprocate in the front-back direction; the pushing plate (51) can avoid the lower workpiece (82) without carrying the upper workpiece (81) to allow it to enter the second feeding section (2) from the first feeding section (1); the pushing plate (51) is used for simultaneously contacting the front ends of the upper workpiece (81) and the lower workpiece (82) and pushing the pre-welding assembly workpiece (8) to move backward to cooperate with the second feeding section (2) to convey the pre-welding assembly workpiece (8); the pushing device (5) further comprises a second driving device (53), the second driving device (53) is used for driving the pushing plate (51) to move to avoid the lower workpiece (82) without carrying the upper workpiece (81); during the rotation reset process of the pushing plate (51) after avoiding the lower workpiece (82), a limiting block is used for limiting the pushing plate (51) so that it cannot rotate reversely to a certain position, so that the pre-welding assembly workpiece (8) is pushed backward by the pushing plate (51) at the angle; the second driving device (53) comprises a rotating shaft (531), a plate frame (532), a swing arm (533) and a telescopic device (534), the rotating shaft (531) is rotatably installed on the plate frame (532) and fixedly connected with the pushing plate (51), the swing arm (533) is fixed on the rotating shaft (531), the first end of the telescopic device (534) is rotatably connected with the plate frame (532), and the second end of the telescopic device (534) is rotatably connected with a position on the swing arm (533) deviating from the axis of the rotating shaft (531); the first driving device (52) is connected with the plate frame (532) to drive the plate frame (532) to reciprocate in the front-back direction. ​ The positioning baffle (6) for positioning the rear end of the pre-welding combined assembly workpiece (8) is further included; the positioning baffle (6) is located at the rear side of the pushing plate (51), the front side surface of the positioning baffle (6) is used for contacting and limiting the rear end of the upper workpiece (81) and the lower workpiece (82); the position of the positioning baffle (6) can be adjusted to avoid the pre-welding combined assembly workpiece (8); The assembly and welding section (3) includes an assembly machine (31) and a welding device (32), the assembly machine (31) is used for positioning the pre-welding combined assembly workpiece (8) in the up-down and left-right directions, and the welding device (32) is used for welding the pre-welding combined assembly workpiece (8) positioned by the assembly machine (31). The assembly and welding section (3) further includes at least four bottom plate pressing devices (33), wherein at least two bottom plate pressing devices (33) are respectively used for pressing the left side edge and the right side edge of the upper surface of the bottom plate before welding, and at least two bottom plate pressing devices (33) are respectively used for pressing the left side edge and the right side edge of the upper surface of the bottom plate after welding; the bottom plate pressing device (33) includes a fifth roller (331), a fifth roller frame (332), a lifting device (334) and a fifth displacement device (333), the fifth roller (331) is used for rolling contact with the left side edge or the right side edge of the upper surface of the bottom plate, the fifth roller (331) is rotatably installed on the fifth roller frame (332), the fifth roller frame (332) is connected with the lifting device (334), and the fifth displacement device (333) is used for moving the lifting device (334) in the left-right direction.

2. The welding line of claim 1, wherein, The assembly machine (31) includes an assembly frame (311), a third conveying device (312), an upper side pressing device (313), a lower side pressing device (314), at least two vertical plate pressing devices (A) and at least two first bottom plate pressing devices (C) installed on the assembly frame (311); the third conveying device (312) is used for conveying the pre-welding combined assembly workpiece (8) from front to back; the upper side pressing device (313) is used for pressing the upper workpiece (81) from the upper side, and the lower side pressing device (314) is used for pressing the lower workpiece (82) from the lower side; at least two vertical plate pressing devices (A) are respectively located on the left and right sides of the third conveying device (312) and are used for pressing the vertical plate from the left and right sides; at least two first bottom plate pressing devices (C) are respectively located on the left and right sides of the bottom plate and are used for pressing the bottom plate from the left and right sides.

3. The welding line of claim 2, wherein, The second feeding section (2) comprises a second conveying device (21), at least two second bottom plate pressing devices (B) and at least two vertical plate pressing devices (A); the at least two second bottom plate pressing devices (B) are respectively located on the left and right sides of the second conveying device (21) and are used for pressing the bottom plate from the left and right sides; the at least two vertical plate pressing devices (A) are respectively located on the left and right sides of the second conveying device (21) and are used for pressing the vertical plate from the left and right sides.

4. The welding line of claim 3, wherein, The first feeding section (1) comprises a first conveying device (11) and at least two second bottom plate pressing devices (B); the at least two second bottom plate pressing devices (B) are respectively located on the left and right sides of the first conveying device (11) and are used for pressing the bottom plate from the left and right sides.

5. The welding line of claim 4, wherein, The vertical plate pressing device (A) comprises a first roller (A1), a first wheel frame (A2) and a first displacement device (A3); the first roller (A1) is used for rolling contact with the left side or the right side of the vertical plate; the first roller (A1) is rotatably installed on the first wheel frame (A2); the first displacement device (A3) is used for moving the first wheel frame (A2) in the left-right direction; the first bottom plate pressing device (C) comprises a sixth roller (C1), a sixth wheel frame (C2) and a sixth displacement device (C3); the sixth roller (C1) is used for rolling contact with the left side edge or the right side edge of the bottom plate; the sixth roller (C1) is rotatably installed on the sixth wheel frame (C2); the sixth displacement device (C3) is used for moving the sixth wheel frame (C2) in the left-right direction; the second bottom plate pressing device (B) comprises a second roller (B1), a second wheel frame (B2) and a second displacement device (B3); the second roller (B1) is used for rolling contact with the left side edge or the right side edge of the bottom plate; the second roller (B1) is rotatably installed on the second wheel frame (B2); the second displacement device (B3) is used for moving the second wheel frame (B2) in the left-right direction; the upper side pressing device (313) comprises a third roller (3131), a third wheel frame (3132) and a third displacement device (3133); the third roller (3131) is used for rolling contact with the upper surface of the upper side workpiece (81); the third roller (3131) is rotatably installed on the third wheel frame (3132); the third displacement device (3133) is used for moving the third wheel frame (3132) in the up-down direction; the lower side pressing device (314) comprises a fourth roller (3141), a fourth wheel frame (3142) and a fourth displacement device (3143); the fourth roller (3141) is used for rolling contact with the lower surface of the lower side workpiece (82); the fourth roller (3141) is rotatably installed on the fourth wheel frame (3142); the fourth displacement device (3143) is used for moving the fourth wheel frame (3142) in the up-down direction.

6. The welding line of claim 1, wherein, The welding equipment (32) comprises guide rails (321), a movable gantry (322), a welding robot (323) and a welding machine (324); the guide rails (321) comprise two guide rails arranged in the front-rear direction, and the two guide rails (321) are respectively arranged on the left and right sides of the assembly machine (31); the movable gantry (322) comprises a cross beam, two columns and a gantry driving device; the lower ends of the two columns are respectively slidably arranged on the two guide rails (321), the two ends of the cross beam are respectively connected to the upper ends of the two columns, and the gantry driving device is used for driving at least one column to slide on the guide rail (321); the welding robot (323) is installed on the cross beam, and the welding machine (324) is installed on the welding robot (323).

7. The welding line of claim 6, wherein, The welding equipment (32) further comprises a cross slide (325) installed on the cross beam, the welding robot (323) is installed on the cross slide (325), and the sliding direction of the cross slide (325) is the up-down direction and the left-right direction.

8. The welding line of claim 6, wherein, It also comprises a laser welding protective fence (7) surrounding the inside of the welding equipment (32); the laser welding protective fence (7) is provided with a safety door, and the welding production line stops working when the safety door is opened.

9. The welding line of claim 6, wherein, The welding machine (324) comprises a laser welding machine (324), the laser welding machine (324) comprises a fiber laser and a laser welding head, the laser welding head is connected to the fiber laser, and the laser welding head is installed on the welding robot (323).

10. The welding line of claim 9, wherein, The welding robot (323) comprises a first welding robot (323) and a second welding robot (323); the first welding robot (323) is provided with a quick-change device, and the quick-change device is used for installing the laser welding head with a power of 10 kW or the laser welding head with a power of 20 kW; the second welding robot (323) is provided with the laser welding head with a power of 10 kW; the laser welding heads on the first welding robot (323) and the second welding robot (323) are connected to the same fiber laser.

11. The welding line of claim 9, wherein, The welding machine (324) further comprises an electric arc welding machine (324), and the electric arc welding machine (324) comprises a welding gun installed on the welding robot (323).

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