LASER WELDING DEVICE FOR LARGE DIAMETER PIPES

Abstract

A laser welding device for large-diameter pipes includes a suspension unit consisting of two semicircular parts. A rotary displacement unit contains a gear. A welding unit comprises a welding gun and a fixed base. The welding gun is connected to the fixed base, and the rotary displacement unit is also connected to the fixed base. By suspending the suspension unit from a first workpiece and butt-jointing a second workpiece to the first, the rotary displacement unit drives the welding unit, allowing the rotary displacement unit and the welding unit to rotate 360 ​​degrees along the arc-shaped racks of the suspension unit to perform a pipe weld.

Description

BACKGROUND OF THE INVENTION 1. Field of the invention

[0001] The present invention relates to the field of laser welding and in particular to a laser welding device suitable for large diameter pipes. 2. Description of the state of the art

[0002] With reference to Fig. 8 and Taiwanese patent no. TW202346015A “Automated Auxiliary Welding Equipment”, the conventional laser welding machine 9 performs welding operations using laser energy. The conventional laser welding machine 9 uses a laser generator to produce a beam which undergoes beam expansion, reflection, and focusing before being directed onto the surface of a workpiece 91. The surface heat is conducted through the workpiece, causing it to melt and form a specific weld pool, thereby achieving laser welding of the workpiece 91.

[0003] However, this conventional laser welding machine 9 uses a coupling assembly 92 connected to the machine, which moves up and down, forward and backward, and left and right through this coupling assembly 92 to generate three-dimensional changes in position and angle. The coupling assembly 92 has a laser gun 93 attached to its end. When the coupling assembly 92 moves, it can slightly affect the laser gun 93, causing it to wobble during welding operations, resulting in inaccurate welding or misalignment.

[0004] Furthermore, this conventional laser welding machine 9 is not suitable for processing large diameter pipes.

[0005] Furthermore, the larger the workpiece 91, the larger the corresponding conventional laser welding machine 9 must be. This leads to higher costs in manufacturing, transport, and space requirements. Therefore, there is a need for improvement.

[0006] The present invention aims to provide a laser welding device for large diameter pipes in order to eliminate the aforementioned deficiencies. SUMMARY OF THE INVENTION

[0007] The present invention relates to a laser welding device for large-diameter pipes and comprises a hanging unit consisting of two semicircular parts connected to each other. The two semicircular parts are connected by two arcuate racks. A rotary displacement unit includes a motor connected to a gear. The gear is in contact with the two arcuate racks of the hanging unit. A welding unit includes a welding gun and a fixed base. The welding gun is connected to the fixed base. The rotary displacement unit is also connected to the fixed base. By attaching the hanging unit to a first workpiece and butt-joining a second workpiece to the first workpiece, the rotary displacement unit drives the welding unit.The rotary displacement unit and the welding unit rotate around the two arc-shaped racks of the hanging unit to perform a butt weld of the first workpiece and the second workpiece.

[0008] Preferably, two ring closures are arranged at the two connecting ends of the two semicircular parts of the hanging unit. The two ring closures are connected to each other to join the two semicircular parts to form a closed circle, so that the two semicircular parts are attached to the first workpiece.

[0009] Preferably, a first guide groove is formed on one side surface of the two semicircular parts of the suspension unit and a second guide groove is formed on the other side surface of the two semicircular parts.

[0010] Preferably, the fixed base of the welding unit has a first guide rod and a second guide rod. The first guide rod corresponds to the first guide groove of the two semicircular parts, and the second guide rod corresponds to the second guide groove of the two semicircular parts.

[0011] Preferably, the motor is connected to the fixed base of the welding unit.

[0012] Preferably, the welding unit rotates a complete revolution around a center point defined by the two semicircular parts of the hanging unit to perform butt welding by the rotary displacement unit.

[0013] Preferably, two support assemblies are attached, one under the first workpiece and one under the second workpiece.

[0014] Preferably, each support assembly comprises four columns and a frame base. Each column has a wheel located at its upper end.

[0015] Preferably, the welding gun of the welding unit is aligned with a joint between the first workpiece and the second workpiece.

[0016] The present invention uses the hanging unit to mount the welding unit to the first workpiece. The second workpiece is then positioned flush with the end face of the first workpiece. The rotary displacement unit is then activated to cause the welding unit to rotate around its center point while welding takes place, thereby achieving the purpose of welding large pipe components.

[0017] The hanging unit comprises two semicircular parts, which are connected by two ring clamps to secure them to the pipe surface of the first workpiece. The welding unit and the rotary-shifting unit are connected to the hanging unit to complete the installation. The laser welding device offers excellent mobility and easy assembly.

[0018] The laser welding device simplifies the welding unit, the hanging unit, and the rotary displacement unit to allow them to be mounted externally on the surface of the first workpiece and easily removed after welding is complete, thereby reducing manufacturing costs.

[0019] The present invention will be more readily understood from the following description when viewed in conjunction with the accompanying drawings, which show a preferred embodiment according to the present invention for illustrative purposes only. BRIEF DESCRIPTION OF THE DRAWINGS Fig. Figure 1 is a perspective view of the laser welding device for large diameter pipes of the present invention; Fig. 2 is a perspective exploded view of the laser welding device of the present invention suitable for large diameter pipes; Fig. Figure 3 illustrates the external assembly unit connected to the first workpiece; Fig. Figure 4 shows the second workpiece, which is butt-jointed to the first workpiece; Fig. Figure 5 is a cross-sectional view of the laser welding device of the present invention suitable for large diameter pipes; Fig. Figure 6 is a schematic view along the X-direction of the Fig. 5 of the present invention was included; Fig. 7 shows the displacement of the welding unit, and Fig. Figure 8 shows a conventional laser welding machine. DETAILED DESCRIPTION OF THE PREFERRED EXECUTION FORM

[0020] Referring to Fig. 1 and Fig. 2 The laser welding device “A” of the present invention is suitable for welding large-diameter pipes, such as the first and second workpieces 51, 52. The laser welding device “A” of the present invention comprises a suspension unit 1, a rotary displacement unit 2, a welding unit 3 and two support assemblies 4.

[0021] The hanging unit 1 comprises two semicircular parts 11, which are connected to each other. Two ring locks 111 are arranged at the two connecting ends of the two semicircular parts 11 of the hanging unit 1. The two ring locks 111 are connected to each other to join the two semicircular parts 11 to form a closed circle. A first guide groove 112 is formed on one side surface of the two semicircular parts 11 of the hanging unit 1. A second guide groove 113 is formed on the other side surface of the two semicircular parts 11. The two semicircular parts 11 are mounted on the first workpiece 51. The two semicircular parts 11 are connected by two arcuate racks 13.

[0022] The rotary displacement unit 2 includes a motor 22 connected to a gear 21. The gear 21 is connected to the two arcuate racks 13 of the suspension unit 1. An output shaft 221 of the motor 22 is connected to the gear 21.

[0023] The welding unit 3 includes a welding gun 31 and a fixed base 32. The motor 22 is connected to the fixed base 32 of the welding unit 3. The welding gun 31 of the welding unit 3 is aligned with a joint between the first workpiece 51 and the second workpiece 52. The fixed base 32 of the welding unit 3 has a first guide rod 321 and a second guide rod 322. The first guide rod 321 corresponds to the first guide groove 112 of the two semicircular parts 11, and the second guide rod 322 corresponds to the second guide groove 113 of the two semicircular parts 11.

[0024] The two support assemblies 4 are each mounted below the first workpiece 51 and the second workpiece 52. Each support assembly 4 comprises four columns 41 and a frame base 43. Each column 41 has a wheel 42 located at its upper end.

[0025] Referring to Fig. 2, Fig. 3 to Fig. 4. The first workpiece 51 and the second workpiece 52 are positioned accordingly on the two support assemblies 4. Regarding the dimensions of the first workpiece 51 and the second workpiece 52, for example, the pipe diameter is 50 cm, with the wheels 42 of the four columns 41 supporting and fixing the surface of the first workpiece 51 and the second workpiece 52 at four contact points. Then, the two semicircular parts 11 of the suspension unit 1 are opened and attached around the circumference of the first workpiece 51. Next, the first guide rod 321 and the second guide rod 322 of the fixed base 32 are inserted into the first guide groove 112 and second guide groove 113 of the two semicircular parts 11, while the arcuate racks 13 mesh with the gear 21, and the two ring locks 111 are used to lock the two semicircular parts 11.

[0026] Referring to Fig. 5, Fig. 6 to Fig.7 The welding gun 31 of the welding unit 3 is aligned with the joint between the first workpiece 51 and the second workpiece 52. The user activates the welding unit 3, and the output shaft 221 of the motor 22 rotates clockwise to drive the gear 21, while the gear 21 engages with and moves along the arc-shaped racks 13, causing the welding unit 3 to rotate one complete revolution around a center point 12 defined by the two semicircular parts 11 to weld the first workpiece 51 and the second workpiece 52 together. Once the welding unit 3 has completed one revolution, the welding is finished, and the output shaft 221 of the motor 22 rotates counterclockwise to return the welding unit 3 to its original standby position to prevent electrical wires from wrapping around the first workpiece 51.The user then removes the welding unit 3, the hanging unit 1 and the rotary displacement unit 2 from the first workpiece 51. As the welding unit 3 rotates, the first guide rod 321 and the second guide rod 322 are inserted into the first guide groove 112 and second guide groove 113, thus preventing wobbling of the welding unit 3 during rotation, which could lead to unstable welds.

[0027] Although the embodiment according to the present invention has been shown and described, it should be clear to the person skilled in the art that further embodiments are possible without deviating from the scope of the present invention. QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] TW 202346015A

[0002]

Claims

[1] Laser welding device for large diameter pipes, comprising: a hanging unit 1 comprising two semicircular parts 11 which are connected to each other, wherein the two semicircular parts 11 are connected by two arcuate racks 13; a rotary displacement unit 2, which includes a motor 22 connected to a gear 21, wherein the gear 21 is connected to the two arcuate racks 13 of the suspension unit 1, and a welding unit 3 comprising a welding gun 31 and a fixed base 32, wherein the welding gun 31 is connected to the fixed base 32, the rotary displacement unit 2 is connected to the fixed base 32, wherein by attaching the suspension unit 1 to a first workpiece 51 and butt-joining a second workpiece 52 to the first workpiece 51, the rotary displacement unit 2 drives the welding unit 3, the rotary displacement unit 2 and the welding unit 3 rotate circumferentially along the two arcuate racks 13 of the suspension unit 1 to perform butt welding of the first workpiece 51 and the second workpiece 52. [2] Laser welding device for large diameter pipes according to claim 1, in which two ring closures 111 are arranged accordingly at two connecting ends of the two semicircular parts 11 of the hanging unit 1, wherein the two ring closures 111 are connected to each other in order to connect the two semicircular parts 11 to form a closed circle, so that the two semicircular parts 11 are attached to the first workpiece 51. [3] Laser welding device for large diameter pipes according to claim 1, in which a first guide groove 112 is formed on a side surface of the two semicircular parts 11 of the hanging unit 1, wherein a second guide groove 113 is formed on the other side surface of the two semicircular parts 11. [4] Laser welding device for large diameter pipes according to claim 3, wherein the fixed base 32 of the welding unit 3 has a first guide rod 321 and a second guide rod 322, wherein the first guide rod 321 corresponds to the first guide groove 112 of the two semicircular parts 11, wherein the second guide rod 322 corresponds to the second guide groove 113 of the two semicircular parts 11. [5] Laser welding device for large diameter pipes according to claim 1, in which the motor 22 is connected to the fixed base 32 of the welding unit 3. [6] Laser welding device for large diameter pipes according to claim 5, wherein the welding unit 3 rotates a complete revolution around a center point defined by the two semicircular parts 11 of the suspension unit 1 to perform butt welding by means of the rotary displacement unit 2. [7] Laser welding device for large diameter pipes according to claim 1, which further comprises two support assemblies 4 designed to be placed below the first workpiece 51 and the second workpiece 52 respectively. [8] Laser welding device for large diameter pipes according to claim 7, wherein each support assembly 4 comprises four columns 41 and a frame base 43, wherein each column 41 has a wheel 42 arranged at an upper end thereof. [9] Laser welding device for large diameter pipes according to claim 1, wherein the welding gun 31 of the welding unit 3 is designed to be aligned with a joint between the first workpiece 51 and the second workpiece 52.

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