Narrow lap joint automatic welding machine

Abstract

The utility model relates to the technical field of welded steel pipe manufacturing, in particular to a narrow-lap-joint automatic welding machine which comprises a narrow-lap-joint automatic welding machine body provided with a containing table, push plates are connected to the left side and the right side of the narrow-lap-joint automatic welding machine body in a sliding mode, and the narrow-lap-joint automatic welding machine body is provided with a power assembly used for stably driving the push plates on the two sides. A control box is installed at the front end of the narrow lap joint automatic welding machine, first racks are slidably connected into the push plate, the adjacent sides of the first racks on the two sides are connected with contact plates, the contact plates are slidably connected with the top face of the containing table, a visual assembly for prompting workers to complete centering is arranged in the push plate, and a buffering assembly for stabilizing a steel belt is arranged at the end of the visual assembly. Through linkage control of the contact plate, the rolling wheel and the pressure sensor, when the contact plate pushes the steel belt, the rolling wheel reduces local pressure of horizontal thrust on the edge of the steel belt, after the steel belt is centered, the pressure sensor monitors the pressure value in real time, power is cut off accurately through the control box, and the steel belt is prevented from overpressure deformation.

Description

Technical Field

[0001] This utility model relates to the field of welded steel pipe manufacturing technology, and in particular to an automatic welding machine for narrow lap joints. Background Technology

[0002] Steel strip, as the core raw material for producing welded steel pipes, is usually made into strip coils using cold rolling or hot rolling processes. During the steel pipe manufacturing process, the steel strip needs to be rolled into a circle through multiple roll forming processes, and then the edges are joined together using welding technology to form a sealed pipe body. Among these processes, narrow lap welding technology has become a key technology for high-precision steel pipe manufacturing due to its advantages such as small weld seam, narrow heat-affected zone, and low material loss.

[0003] In the prior art, an automatic seam welding machine for narrow lap joints of steel strips, with publication number CN218487589U, employs a double-sided positioning plate mechanical structure to center the steel strip. Specifically, the equipment uses a servo motor to drive two sets of symmetrically distributed positioning plates, causing them to move synchronously towards the center along the guide rail, squeezing the edges of the steel strip from both sides and forcing the centerline of the steel strip to coincide with the axis of the welding head.

[0004] However, the existing equipment has significant drawbacks in the centering and positioning process. Because it relies solely on a rigid positioning plate to apply horizontal extrusion force to the steel strip, when the steel strip has uneven thickness or initial bending, the double-sided extrusion easily leads to localized plastic deformation, causing excessive ellipticity of the cross-section. Under high-speed continuous feeding conditions, the dynamic contact between the steel strip and the positioning plate is prone to vibration, causing the weld centerline to shift, which in turn leads to welding defects such as incomplete fusion and porosity. Utility Model Content

[0005] To overcome the drawback of easy plastic deformation, this utility model provides a narrow lap joint automatic welding machine, which aims to solve the above-mentioned shortcomings.

[0006] An automatic welding machine for narrow lap joints includes a narrow lap joint automatic welding machine, a placement platform installed on the narrow lap joint automatic welding machine, push plates slidably connected to the left and right sides of the narrow lap joint automatic welding machine, and a power component for stably driving the push plates on both sides. A control box is installed at the front end of the narrow lap joint automatic welding machine. A first rack is slidably connected inside the push plate, and a contact plate is connected to the side adjacent to the first rack on both sides. The contact plate is slidably connected to the top surface of the placement platform. A visual component is provided inside the push plate to prompt the operator to complete the centering. A buffer component for stabilizing the steel belt is provided at the end of the visual component.

[0007] Furthermore, the visual assembly includes a pressure plate, a gear rotatably connected inside the push plate, the gear meshing with the first rack, a torsion spring sleeved at both ends of the gear shaft, one end of the torsion spring connected to the gear and the other end connected to the push plate, a guide block connected inside the push plate, a second rack connected to one end of the pressure plate, the second rack meshing with the gear, the other end of the pressure plate contacting the top surface of the steel strip, and the middle part of the pressure plate slidably connected inside the guide block.

[0008] Furthermore, the buffer assembly includes a mounting block, which is slidably connected to the end of the pressure plate that contacts the steel strip. A movable plate is rotatably connected to the bottom of the mounting block, and a return spring is provided inside the pressure plate. The lower end of the return spring is connected to the mounting block.

[0009] Furthermore, it also includes a fixing plate, in which a pressure sensor is installed. The fixing plate is slidably connected to the pressure plate and connected to the top of the reset spring. The fixing plate and the pressure sensor are pressed together, and the pressure sensor is wired to the control box.

[0010] Furthermore, a protective pad is connected to the bottom surface of the movable plate.

[0011] Furthermore, several rollers are rotatably connected to the bottom surface of the first rack.

[0012] Furthermore, an alarm light is installed on the top of the pressure plate, and the alarm light is wired to the control box.

[0013] Furthermore, the sliding mating surfaces of the push plate and the contact plate are circumferentially distributed with telescopic pads, which are compressed when the push plate and the contact plate slide relative to each other.

[0014] Compared with the prior art, the present invention has the following advantages:

[0015] 1. Through the linkage control of the contact plate, rollers and pressure sensor, when the contact plate pushes the steel belt, the rollers reduce the local pressure of the horizontal thrust on the edge of the steel belt. When the steel belt is centered, the pressure sensor monitors the pressure value in real time and cuts off the power through the control box to avoid overpressure deformation of the steel belt.

[0016] 2. The protective pad makes flexible contact with the steel strip when the pressure plate is pressed down, buffering mechanical impact. The movable plate can deflect around the mounting block, adaptively conforming to the surface of the bent steel strip, expanding the effective contact area and eliminating the risk of surface scratches. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0018] Figure 2This is a schematic diagram of the installation structure of the placement platform and push plate of this utility model.

[0019] Figure 3 This is a cross-sectional view showing the connection relationship between the second rack and the pressure plate of this utility model.

[0020] Figure 4 This is a cross-sectional view showing the connection relationship between the gear and the torsion spring of this utility model.

[0021] Figure 5 This is a cross-sectional view showing the connection relationship between the reset spring and the mounting plate of this utility model.

[0022] In the attached diagram: 1: Narrow overlap automatic welding machine, 2: Placement table, 3: Push plate, 4: Control box, 5: Contact plate, 6: First rack, 7: Gear, 8: Torsion spring, 9: Second rack, 10: Pressure plate, 11: Guide block, 12: Mounting block, 13: Return spring, 14: Movable plate, 15: Fixed plate, 16: Pressure sensor, 17: Protective pad, 18: Roller, 19: Alarm light, 20: Telescopic pad. Detailed Implementation

[0023] References to embodiments herein mean that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the present invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0024] Example: An automatic welding machine for narrow lap joints, such as Figures 1-5 As shown, the system includes a narrow lap automatic welding machine 1, a placement table 2, push plates 3, a control box 4, a contact plate 5, a first rack 6, a visual assembly, and a buffer assembly. The narrow lap automatic welding machine 1 is equipped with the placement table 2. Push plates 3 are slidably connected to the left and right sides of the narrow lap automatic welding machine 1. The narrow lap automatic welding machine 1 is also equipped with a power assembly for stably driving the push plates 3 on both sides. When the steel strip is conveyed along the placement table 2, the power assembly of the narrow lap automatic welding machine 1 is activated, driving the push plates 3 on both sides to slide horizontally towards the center synchronously. The horizontal thrust gradually aligns the steel strip with the center line. The front end of the narrow lap automatic welding machine 1 is equipped with... There is a control box 4, and a first rack 6 is slidably connected inside the push plate 3. A contact plate 5 is fixedly connected to the adjacent side of the first rack 6 on both sides. The contact plate 5 is slidably connected to the top surface of the placement platform 2. If the steel strip is not completely centered, there is no relative sliding between the contact plate 5 and the push plate 3. At this time, the push plate 3 continues to apply pressure until the steel strip is displaced. When the steel strip is centered, the contact plate 5 stops moving due to the resistance of the steel strip, while the push plate 3 continues to move inward, causing the contact plate 5 and the push plate 3 to slide relative to each other. A visual component is set inside the push plate 3 to prompt the staff to complete the centering. A buffer component to stabilize the steel strip is set at the end of the visual component.

[0025] like Figures 2-4 As shown, the visual assembly includes a gear 7, a torsion spring 8, a second rack 9, a pressure plate 10, and a guide block 11. The gear 7 is rotatably connected inside the push plate 3, and the gear 7 meshes with the first rack 6. Both ends of the gear 7's rotating shaft are fitted with torsion springs 8. One end of the torsion spring 8 is fixedly connected to the gear 7, and the other end is fixedly connected to the push plate 3. When the gear 7 rotates, the torsion spring 8 stores energy. When the push plate 3 moves in the opposite direction, the torsion spring 8 releases energy to drive the gear 7 to reset, ensuring continuous transmission. The guide block 11 is fixedly connected inside the push plate 3. One end of the pressure plate 10 is connected to the second rack 9, which meshes with the gear 7. The other end of the pressure plate 10 contacts the top surface of the steel belt. The middle part of the pressure plate 10 is slidably connected inside the guide block 11. After the steel belt is initially centered, the power assembly continues to drive the push plate 3 to move inward. The contact plate 5 stops moving due to the resistance of the steel belt, and the first rack 6 stops. When the push plate 3 moves inward, the first rack 6 drives the gear 7 to rotate. The rotation of the gear 7 causes the second rack 9, which meshes with it, to move vertically downward, so that the pressure plate 10 descends steadily along the guide block 11.

[0026] like Figure 3 and Figure 5 As shown, the buffer assembly includes a mounting block 12, a return spring 13, and a movable plate 14. The mounting block 12 is slidably connected to the end of the pressure plate 10 that contacts the steel strip. The movable plate 14 is rotatably connected to the bottom of the mounting block 12. The pressure plate 10 is provided with a return spring 13, and the lower end of the return spring 13 is fixedly connected to the mounting block 12.

[0027] like Figure 5 As shown, it also includes a fixing plate 15 and a pressure sensor 16. The pressure sensor 16 is installed inside the pressure plate 10. The fixing plate 15 is slidably connected inside the pressure plate 10 and connected to the top of the return spring 13. The fixing plate 15 and the pressure sensor 16 are pressed together. The pressure sensor 16 is wired to the control box 4 to realize signal transmission. The pressure sensor 16 monitors the pressure value transmitted by the spring in real time and sets the centering threshold to accurately determine the timing of centering completion and avoid overpressure that could cause deformation of the steel strip.

[0028] like Figure 5 As shown, it also includes a protective pad 17. The bottom surface of the movable plate 14 is connected to the protective pad 17. The protective pad 17 is made of a highly elastic and wear-resistant material. When the movable plate 14 is pressed down, it absorbs the impact force and prevents the steel strip surface from being scratched.

[0029] like Figure 3 As shown, it also includes rollers 18. Five rollers 18 are rotatably connected to the bottom surface of the first rack 6. The bottom rollers 18 of the first rack 6 continuously roll when the push plate 3 moves, converting sliding friction into rolling friction, reducing power loss and component wear.

[0030] like Figure 3As shown, it also includes an alarm light 19. An alarm light 19 is installed on the top of the pressure plate 10. The alarm light 19 is wired to the control box 4, providing dual audible and visual alerts, which facilitates remote monitoring of the centering status by staff and timely intervention and adjustment.

[0031] like Figure 1 As shown, it also includes a telescopic pad 20. The telescopic pads 20 are evenly distributed circumferentially on the outer side of the sliding mating surface of the push plate 3 and the contact plate 5. The telescopic pads 20 are compressed when the push plate 3 and the contact plate 5 slide relative to each other.

[0032] When the steel strip passes over the placement table 2, the power component inside the narrow overlap automatic welding machine 1 drives the push plates 3 on both sides to slide towards the middle, thereby moving the contact plate 5 and the pressure plate 10 towards the middle. The first rack 6 follows the contact plate 5 to slide towards the middle. The five rollers 18 at the bottom of the first rack 6 rotate on the placement table 2, reducing the friction between the first rack 6 and the placement table 2. The contact plates 5 on both sides contact the steel strip and push the steel strip to center and align it, which facilitates precise welding after subsequent processing into steel pipes. During the process of the contact plate 5 pushing the steel strip, if the steel strip is not centered, the contact plate 5 and the push plate 3 do not slide relative to each other. If it is already centered, the contact plate 5 and the push plate 3 slide relative to each other, but the relative sliding between the push plate 3 and the contact plate 5 is not obvious when only observed.

[0033] After the contact plates 5 on both sides push the steel strip to the center, the narrow overlap automatic welding machine 1 continues to drive the push plate 3 to move towards the center. At this time, the steel strip squeezes the contact plate 5 and slides inside the push plate 3. Due to the roller 18 at the bottom of the first rack 6, once the steel strip is centered, the static friction between the contact plate 5 and the first rack 6 is insufficient to cause plastic deformation of the steel strip, and the squeezing force is directly transmitted to the gear 7. The contact plate 5 and the first rack 6 remain fixed, and the push plate 3 continues to slide inward. The first rack 6 drives the gear 7 to rotate, torsion spring 8, and gear 7 pulls the second rack 9 to slide downward, thereby driving the pressure plate 10 to slide downward. The pressure plate 10 achieves stable up and down sliding through the guide block 11. The movable plate 14 connected to the end of the pressure plate 10 contacts the steel strip and presses the steel strip down from the middle. Plate 14 transmits the compressive force to mounting block 12, which compresses return spring 13. The compressive force is then transmitted upward through return spring 13 to fixed plate 15 and pressure sensor 16. When pressure sensor 16 detects that the pressure value has reached the preset threshold, control box 4 immediately cuts off the power supply to the power component and drives push plate 3 to slide to both sides in the reverse direction through the power component of narrow overlap automatic welding machine 1. At this time, control box 4 turns on alarm light 19 to indicate to the staff that the steel strip has been centered. The protective pad 17 at the bottom of movable plate 14 contacts the steel strip, buffering the pressure while protecting the surface quality of the steel strip. Moreover, for bent steel strips, movable plate 14 can rotate around mounting block 12 to achieve adaptive contact with the steel strip and ensure sufficient contact area.

[0034] When the push plate 3 slides to both sides, the return spring 13 rebounds, the protective pad 17 remains in contact with the steel strip, the pressure plate 10 slides upward, the second rack 9 pulls the gear 7 to rotate counterclockwise, the torsion spring 8 torsions back, together driving the gear 7 to rotate and reset. The rotation of the gear 7 drives the first rack 6 away from the push plate 3. At this time, the contact plate 5 still remains in contact with the steel strip until the return spring 13 fully rebounds. When the protective pad 17 separates from the steel strip, after the return spring 13 fully rebounds, the mounting block 12 drives the movable plate 14 to move upward. When the push plate 3 moves outward, the contact plate 5 exits synchronously with the first rack 6 to ensure that the steel strip passes through without obstruction. After the pressure sensor 16 detects a decrease in value, the control box 4 turns off the alarm light 19, completing a single steel strip centering process. This process is repeated to continuously push and center the steel strip.

[0035] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. An automatic welding machine for narrow lap joints, characterized in that, The system includes a narrow lap automatic welding machine (1), which is equipped with a placement platform (2). Push plates (3) are slidably connected to the left and right sides of the narrow lap automatic welding machine (1). The narrow lap automatic welding machine (1) is equipped with a power assembly for stably driving the push plates (3) on both sides. A control box (4) is installed at the front end of the narrow lap automatic welding machine (1). A first rack (6) is slidably connected inside the push plate (3). A contact plate (5) is connected to the side adjacent to the first rack (6) on both sides. The contact plate (5) is slidably connected to the top surface of the placement platform (2). A visual assembly is provided inside the push plate (3) to prompt the operator to complete the centering. A buffer assembly for stabilizing the steel belt is provided at the end of the visual assembly.

2. The narrow lap joint automatic welding machine according to claim 1, characterized in that, The visual assembly includes a pressure plate (10), a gear (7) is rotatably connected inside the push plate (3), the gear (7) meshes with the first rack (6), and torsion springs (8) are sleeved on both ends of the shaft of the gear (7). One end of the torsion spring (8) is connected to the gear (7), and the other end is connected to the push plate (3). A guide block (11) is connected inside the push plate (3). A second rack (9) is connected to one end of the pressure plate (10), and the second rack (9) meshes with the gear (7). The other end of the pressure plate (10) contacts the top surface of the steel strip, and the middle part of the pressure plate (10) is slidably connected inside the guide block (11).

3. The narrow lap joint automatic welding machine according to claim 2, characterized in that, The buffer assembly includes a mounting block (12), which is slidably connected to the end of the pressure plate (10) that contacts the steel strip. A movable plate (14) is rotatably connected to the bottom of the mounting block (12). A reset spring (13) is provided inside the pressure plate (10), and the lower end of the reset spring (13) is connected to the mounting block (12).

4. The narrow lap joint automatic welding machine according to claim 3, characterized in that, It also includes a fixing plate (15), a pressure sensor (16) is installed inside the pressure plate (10), the fixing plate (15) is slidably connected inside the pressure plate (10), the fixing plate (15) is connected to the top of the reset spring (13), the fixing plate (15) and the pressure sensor (16) are pressed together, and the pressure sensor (16) is wired to the control box (4).

5. The narrow lap joint automatic welding machine according to claim 4, characterized in that, The bottom surface of the movable plate (14) is connected to a protective pad (17).

6. The narrow lap joint automatic welding machine according to claim 5, characterized in that, The bottom surface of the first rack (6) is rotatably connected to several rollers (18).

7. The narrow lap joint automatic welding machine according to claim 6, characterized in that, An alarm light (19) is installed on the top of the pressure plate (10), and the alarm light (19) is wired to the control box (4).

8. The narrow lap joint automatic welding machine according to claim 7, characterized in that, The push plate (3) and the contact plate (5) have circumferentially distributed telescopic pads (20) on the outer side of their sliding mating surfaces. When the push plate (3) and the contact plate (5) slide relative to each other, the telescopic pads (20) are compressed.

Images