Mechanical engineering workpiece welding device

Abstract

The invention relates to the technical field of workpiece welding devices, and particularly discloses a mechanical engineering workpiece welding device which comprises a welding base. The device further comprises a clamping jaw driving base. A clamping mechanism; a pipe abutment; a welding frame; a welding head; the guide mechanism is located on the surface of the welding frame; according to the mechanical engineering workpiece welding device, a to-be-welded steel pipe main pipe and a branch pipe can be in butt joint through the clamping mechanism and the pipeline abutting piece, when the clamping mechanism fixes the steel pipe main pipe, the wall thickness of the steel pipe main pipe can be detected, and therefore the output power of a welding head is adjusted according to the wall thickness of the main pipe; the guide mechanism adjusts the included angle between the welding head and the saddle opening according to the displacement of the guide contact in the vertical direction, and when the guide contact moves in the vertical direction, the segmentation mechanism divides a welding seam into a plurality of small segments and conducts segment-by-segment interval welding, so that welding stress is evenly distributed, stress concentration is avoided, and contraction force of all parts is balanced.

Description

Technical Field

[0001] The present invention relates to the technical field of workpiece welding devices, and specifically to a welding device for mechanical engineering workpieces. Background Technique

[0002] A mechanical engineering workpiece welding device is a device used to connect two or more mechanical engineering workpieces together through a welding process. Generally, it is divided into manual welding devices, semi-automatic welding devices, and automatic welding devices.

[0003] Among them, a steel pipe T-shaped saddle joint welding machine is a device used to weld the saddle-shaped weld at the T-shaped joint of steel pipes. When welding, the staff fixes the steel pipe to be welded through a fixture, and then controls the welding torch to approach the steel pipe joint. The welding torch moves along the intersection line trajectory of the T-shaped saddle of the steel pipe and welds according to the preset welding parameters.

[0004] However, during the welding process, the saddle joint part will undergo uneven heating and cooling processes. Due to the asymmetry of the saddle joint shape, the thermal expansion and contraction degrees of different parts are different, which easily generates large welding stresses, resulting in deformation of the welded parts. For example, the connection part between the branch pipe and the main pipe may be distorted, bent, etc., affecting the dimensional accuracy and assembly quality of the welded parts. Therefore, we propose a welding device for mechanical engineering workpieces. Summary of the Invention

[0005] The purpose of the present invention is to provide a welding device for mechanical engineering workpieces to solve the problem that during the welding process, the saddle joint part will undergo uneven heating and cooling processes. Due to the asymmetry of the saddle joint shape, the thermal expansion and contraction degrees of different parts are different, which easily generates large welding stresses, resulting in deformation of the welded parts.

[0006] To achieve the above purpose, the present invention provides the following technical solution: A welding device for mechanical engineering workpieces, including a welding base; further including a jaw driving seat, the jaw driving seat is installed on the welding base; a clamping mechanism, the clamping mechanism is connected to the jaw driving seat, and the jaw driving seat drives the clamping mechanism to rotate; a pipe abutting member, the pipe abutting member is installed on the welding base, and the working surface of the clamping mechanism corresponds to the pipe abutting member; a welding frame, the welding frame is installed on the welding base, and the welding frame is composed of a flexible support arm and a fixed seat; a welding head, a flexible support rod I is fixedly connected to the outside of the welding head, and the flexible support rod I is connected to the welding frame; A guiding mechanism, the guiding mechanism is located on the surface of the welding frame. When the clamping mechanism drives the pipe fitting to rotate, the guiding mechanism contacts the weld seam in advance, and the guiding mechanism adjusts the welding angle of the welding head according to the intersection line trajectory of the T-shaped saddle of the steel pipe. The segmenting mechanism is connected to the guiding mechanism. When the guiding mechanism moves along the intersection line trajectory of the T-shaped saddle opening of the steel pipe, the segmenting mechanism adjusts the welding sequence of the welding head.

[0007] Among them, the clamping mechanism includes a jaw plate. The jaw plate is fixed to the jaw driving seat. Two groups of adjusting grooves are provided on the surface of the jaw plate. The two groups of adjusting grooves are axisymmetric about the jaw plate. A plurality of threaded grooves are provided on the inner wall of the adjusting groove. A limiting rod is threadedly connected to the inner wall of the threaded groove. Two limiting rods are threadedly connected in each group of adjusting grooves.

[0008] Among them, outside one of the adjusting grooves, there is an adjusting member for adjusting the output power of the welding head according to the thickness of the main steel pipe. The adjusting member includes a baffle plate fixedly connected to the surface of the jaw plate. A detection plate is slidably connected to the inner wall of the baffle plate. A screw rod is rotatably connected to the surface of the jaw plate. The screw rod is threadedly connected to the inner wall of the detection plate. An insulating plate one is fixedly connected to the outside of the detection plate. A sliding rheostat one is installed on the surface of the jaw plate. The insulating plate one is fixed to the sliding piece in the sliding rheostat one. A conductive ring is installed on the surface of the jaw plate. The conductive ring is connected to the sliding rheostat one. A conductive seat is installed on the surface of the welding base. A conductive piece is installed at one end of the conductive seat close to the conductive ring. The conductive ring is located inside the conductive piece. The conductive ring is rotatably connected to the conductive piece. The conductive seat is connected to the fixed seat.

[0009] Among them, the guiding mechanism includes a guiding contact head. A flexible support rod two is fixedly connected to the outside of the guiding contact head. A limiting block is fixedly connected to the outside of the flexible support rod two. A limiting groove is provided on the surface of the flexible support arm. The limiting block is slidably connected to the inner wall of the limiting groove. A compression spring one is fixedly connected to the outside of the limiting block. The compression spring one is fixed to the inner wall of the limiting groove. A guiding member is provided on the surface of the flexible support arm. The guiding member is located outside the flexible support rod one.

[0010] Among them, the guiding member includes a support frame located outside the flexible support rod one. A flexible support rod three is fixedly connected to the outside of the support frame. The flexible support rod three is fixed to the flexible support arm. An iron sheet is fixedly connected to the outside of the flexible support rod one. A reset spring is fixedly connected to the outside of the iron sheet. The reset spring is fixed to the inner wall of the support frame. An electromagnet is fixedly connected to the inner wall of the support frame. A regulating member for adjusting the magnetic force of the electromagnet according to the position of the limiting block is provided outside the limiting block.

[0011] Among them, the regulating member includes an insulating plate two fixedly connected to the outside of the limiting block. A sliding rheostat two is installed on the surface of the flexible support arm. The insulating plate two is fixed to the sliding piece of the sliding rheostat two.

[0012] Among them, the segmenting mechanism includes arc groove 1 and arc groove 2 respectively located at both ends of the limit groove. Arc groove 1 is provided with six arc transition segments, and arc groove 2 is provided with four arc transition segments. A travel switch 1, a travel switch 3 and a travel switch 5 are installed on the inner wall of arc groove 1, a travel switch 2 and a travel switch 4 are installed on the inner wall of arc groove 2, trigger members are respectively provided at both ends of the limit groove, and the two trigger members are respectively located outside arc groove 1 and arc groove 2.

[0013] Among them, the trigger member includes a moving block slidably connected to the inner wall of the limit groove. A chute is opened in the inner wall of the moving block, a silica gel block is slidably connected to the inner wall of the chute, the silica gel block is slidably connected to the inner wall of arc groove 1, and a plurality of compression springs 2 are fixedly connected to the outside of the moving block, and the compression springs 2 are fixed to the inner wall of the limit groove.

[0014] Among them, a plurality of stepped sections are respectively provided on the surfaces of arc groove 1 and arc groove 2.

[0015] Among them, travel switch 1 and travel switch 4 are normally closed contacts, which are closed under normal conditions and disconnected when triggered. Travel switch 2, travel switch 3 and travel switch 5 are normally open contacts, which are disconnected under normal conditions and closed when triggered.

[0016] The present invention has at least the following beneficial effects: 1. When the present application is in use, an operator can butt the main pipe and the branch pipe of the steel pipe to be welded through the clamping mechanism and the pipe abutting member, so that the weld at the joint of the steel pipe is in a saddle-shaped opening. When the clamping mechanism fixes the main pipe of the steel pipe, the wall thickness of the main pipe of the steel pipe can be detected, and thus the output power of the welding head can be adjusted according to the wall thickness of the main pipe.

[0017] 2. When the jaw driving seat drives the main pipe and the branch pipe to rotate, the guiding mechanism moves along the intersection line trajectory of the T-shaped saddle opening of the steel pipe. Since the intersection line of the saddle opening is elliptical, the guiding contact of the guiding mechanism will generate a displacement in the vertical direction. The guiding mechanism adjusts the angle between the welding head and the saddle opening according to the displacement magnitude of the guiding contact in the vertical direction. When the guiding contact moves in the vertical direction, the segmenting mechanism divides the weld into several small segments and performs segmented and spaced welding, so that the welding stress is evenly distributed, stress concentration is avoided, and the shrinkage forces of each part are balanced. Description of the Drawings

[0018] Figure 1 is a schematic diagram of the overall structure of the present invention; Figure 2 is a schematic diagram of the structure of the clamping mechanism of the present invention; Figure 3 is Figure 2 the enlarged schematic diagram of area A in Figure 4 is a schematic diagram of the connection relationship between the welding head and the flexible support arm of the structure of the present invention; Figure 5Schematic structural diagram of the guiding mechanism of the present invention; Figure 6 Schematic structural diagram of the guiding part of the present invention; Figure 7 Front view sectional schematic diagram of the limiting groove of the present invention; Figure 8 is Figure 7 Enlarged schematic diagram of area B in Figure 9 Front view schematic diagram of the arc groove 1 and arc groove 2 of the structure of the present invention; Figure 10 Schematic structural diagram of the triggering part of the present invention; Figure 11 Schematic diagram of the connection relationship between the spring damper and the travel switch 1 of the present invention.

[0019] In the figure: 1. Welding base; 2. Claw driving seat; 3. Clamping mechanism; 30. Claw disc; 31. Adjusting groove; 32. Threaded groove; 33. Limiting rod; 34. Adjusting part; 35. Baffle; 36. Detection plate; 37. Screw; 38. Potentiometer 1; 39. Conductive ring; 310. Conductive seat; 311. Conductive sheet; 312. Insulating plate 1; 4. Pipe abutting part; 5. Welding frame; 50. Flexible support arm; 51. Fixed seat; 6. Welding head; 60. Flexible support rod 1; 7. Guiding mechanism; 70. Guiding contact; 71. Flexible support rod 2; 72. Limiting block; 73. Limiting groove; 74. Compression spring 1; 75. Guiding part; 76. Support frame; 77. Flexible support rod 3; 78. Iron sheet; 79. Return spring; 710. Electromagnet; 711. Regulating part; 712. Insulating plate 2; 713. Potentiometer 2; 8. Segmentation mechanism; 80. Arc groove 1; 81. Arc groove 2; 82. Travel switch 1; 83. Travel switch 3; 84. Travel switch 5; 85. Travel switch 2; 86. Travel switch 4; 87. Triggering part; 88. Moving block; 89. Slide groove; 810. Silicone block; 811. Compression spring 2; 812. Spring damper. Detailed implementation manners

[0020] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0021] Embodiment 1 Please refer to Figures 1 to 11, the present invention provides a technical solution: a welding device for mechanical engineering workpieces, including a welding base 1; further including a jaw drive base 2, the jaw drive base 2 is installed on the welding base 1; a clamping mechanism 3, the clamping mechanism 3 is connected to the jaw drive base 2, and the jaw drive base 2 drives the clamping mechanism 3 to rotate; a pipe abutting member 4, the pipe abutting member 4 is installed on the welding base 1, and the working surface of the clamping mechanism 3 corresponds to the pipe abutting member 4; a welding frame 5, the welding frame 5 is installed on the welding base 1, and the welding frame 5 is composed of a flexible support arm 50 and a fixed seat 51; a welding head 6, a flexible support rod 60 is fixedly connected to the outside of the welding head 6, and the flexible support rod 60 is connected to the welding frame 5; a guiding mechanism 7, the guiding mechanism 7 is located on the surface of the welding frame 5, when the clamping mechanism 3 drives the pipe fitting to rotate, the guiding mechanism 7 contacts the weld seam in advance, and the guiding mechanism 7 adjusts the welding angle of the welding head 6 according to the intersection line trajectory of the steel pipe T-shaped saddle opening; a segmentation mechanism 8, the segmentation mechanism 8 is connected to the guiding mechanism 7, when the guiding mechanism 7 moves along the intersection line trajectory of the steel pipe T-shaped saddle opening, the segmentation mechanism 8 adjusts the welding sequence of the welding head 6.

[0022] During use, the staff fixes the main pipe of the steel pipe through the clamping mechanism 3, and abuts the branch pipe against the connection of the main pipe through the pipe abutting member 4, so that the main pipe and the branch pipe are connected in a T shape.

[0023] The inner cores of the flexible support arm 50 and the flexible support rod 60 are mostly nickel-titanium alloy inner cores, which have stronger elasticity and are not easy to break after long-term bending, providing rigid support and shaping ability. The outer packages of the flexible support arm 50 and the flexible support rod 60 are made of silica gel, rubber or PVC plastic, with a soft touch, insulating and anti-slip, while protecting the metal core. The inner core metal has a certain rigidity (maintaining shape) and plasticity (can be manually bent), and maintains the deformation due to the internal stress of the metal after bending, so as to fix the angle. The flexible outer package increases the friction force, prevents rebound due to gravity or external force after bending, and improves the holding comfort and safety at the same time.

[0024] After the main pipe and the branch pipe are limited, the staff adjusts the flexible support arm 50 to move the welding head 6 and the guiding mechanism 7 to the position of the steel pipe T-shaped saddle opening, adjusts the flexible support rod 60 to make the welding head 6 outside the weld seam, and the staff adjusts the guiding contact 70 of the guiding mechanism 7 to the surface of the intersection line of the steel pipe T-shaped saddle opening. Thus, when the jaw drive base 2 drives the main pipe and the branch pipe to rotate, the weld seam at the saddle opening and the guiding contact 70 are mutually extruded, so that the guiding contact 70 moves in the vertical direction. The guiding mechanism 7 adjusts the included angle between the welding head 6 and the saddle opening according to the displacement size of the guiding contact 70 in the vertical direction. When the guiding contact 70 moves in the vertical direction, the segmentation mechanism 8 divides the weld seam into several small segments and performs welding at intervals one by one, so that the welding stress is evenly distributed, avoiding stress concentration and balancing the shrinkage force of each part.

[0025] The clamping mechanism 3 includes a jaw plate 30. The jaw plate 30 is fixed to the jaw driving seat 2. Two sets of adjustment grooves 31 are formed on the surface of the jaw plate 30. The two sets of adjustment grooves 31 are axisymmetric about the jaw plate 30. A plurality of threaded grooves 32 are formed on the inner wall of the adjustment groove 31. A limiting rod 33 is threadedly connected to the inner wall of the threaded groove 32. Two limiting rods 33 are threadedly connected in each set of adjustment grooves 31.

[0026] When clamping the main pipe of the steel pipe, the distance between the two limiting rods 33 is adjusted according to the size of the main pipe. The limiting rod 33 is threadedly connected to the inner wall of the threaded groove 32 to cooperate with clamping and limiting the two ends of the main pipe, so that the main pipe is fixed on the surface of the jaw plate 30. The branch pipe is abutted against the connection of the main pipe through the pipe abutting member 4, so that the main pipe and the branch pipe are in a T-shaped connection.

[0027] The guiding mechanism 7 includes a guiding contact 70. A flexible support rod two 71 is fixedly connected to the outside of the guiding contact 70. A limiting block 72 is fixedly connected to the outside of the flexible support rod two 71. A limiting groove 73 is formed on the surface of the flexible support arm 50. The limiting block 72 is slidably connected to the inner wall of the limiting groove 73. A compression spring one 74 is fixedly connected to the outside of the limiting block 72. The compression spring one 74 is fixed to the inner wall of the limiting groove 73. A guiding member 75 is provided on the surface of the flexible support arm 50. The guiding member 75 is located outside the flexible support rod one 60.

[0028] The material of the flexible support rod two 71 is the same as that of the flexible support rod one 60. Thus, the staff adjusts the flexible support rod two 71 to adjust the guiding contact 70 to the surface of the intersection line of the T-shaped saddle opening of the steel pipe. When the jaw driving seat 2 drives the jaw plate 30 to rotate, the steel pipe rotates together with the jaw plate 30. The T-shaped joint of the steel pipe is formed by the perpendicular intersection of the main pipe (parent pipe) and the branch pipe (sub-pipe). The intersection line of the branch pipe and the main pipe is a saddle-shaped curve in space (mathematically called the "intersection line"). The two sides of the saddle opening bulge and the middle is concave, that is, the "saddle peak" and the "saddle valley". From the welding perspective, this curve forms a trajectory similar to an ellipse on the surface of the main pipe. Thus, the saddle opening weld of the steel pipe squeezes the guiding contact 70 as the steel pipe rotates, so that every time the jaw plate 30 rotates one circle, the guiding contact 70 will experience four processes of rising, falling, rising and falling in the vertical direction.

[0029] When the guiding contact 70 moves towards the "saddle peak", the guiding contact 70 pushes the limiting block 72 to move through the flexible support rod two 71, so that the limiting block 72 slides upward on the inner wall of the limiting groove 73, and the limiting block 72 stretches the compression spring one 74. When the guiding contact 70 moves towards the "saddle valley", the compression spring one 74 in the stretched state drives the limiting block 72 to reset. The movement of the limiting block 72 triggers the guiding member 75. The guiding member 75 adjusts the inclination angle of the welding head 6 and the saddle opening of the steel pipe according to the movement distance condition of the guiding contact 70 and the inclination angle of the flexible support rod one 60.

[0030] The guiding member 75 includes a support frame 76 located outside the first flexible support rod 60. A third flexible support rod 77 is fixedly connected to the outside of the support frame 76. The operator adjusts the third flexible support rod 77 to align the welding head 6 towards the steel pipe weld. The third flexible support rod 77 is fixed to the flexible support arm 50. A iron sheet 78 is fixedly connected to the outside of the first flexible support rod 60. A return spring 79 is fixedly connected to the outside of the iron sheet 78. The return spring 79 is fixed to the inner wall of the support frame 76. An electromagnet 710 is fixedly connected to the inner wall of the support frame 76. A regulating member 711 for adjusting the magnetic force of the electromagnet 710 according to the position of the limit block 72 is provided outside the limit block 72; The regulating member 711 includes a second insulating plate 712 fixedly connected to the outside of the limit block 72. A second sliding rheostat 713 is installed on the surface of the flexible support arm 50. The second insulating plate 712 is fixed to the sliding piece of the second sliding rheostat 713. The second sliding rheostat 713 is connected in series with the electromagnet 710. A decrease in resistance results in an increase in current and an increase in magnetic force.

[0031] When the guiding contact 70 moves towards the "saddle peak", the limit block 72 moves upward along the limit groove 73. The limit block 72 drives the second insulating plate 712 to move upward. The second insulating plate 712 drives the sliding piece of the second sliding rheostat 713 to move upward, causing the resistance of the second sliding rheostat 713 to decrease. With the voltage remaining unchanged, the current intensity of the electromagnet 710 increases, and thus the magnetic force of the electromagnet 710 increases. The increased magnetic force of the electromagnet 710 drives the iron sheet 78 to move upward. The iron sheet 78 drives the first flexible support rod 60 to tilt upward. The first flexible support rod 60 stretches the return spring 79. The upward tilt of the first flexible support rod 60 causes the welding head 6 to lift, so that the angle with the tangent direction of the main pipe remains between 60° and 80°, ensuring uniform weld formation; When the guiding contact 70 moves towards the "saddle valley", the first compression spring 74 in the stretched state pulls the limit block 72 to reset. The limit block 72 drives the second insulating plate 712 to reset. The second insulating plate 712 drives the sliding piece of the second sliding rheostat 713 to reset, thereby increasing the resistance of the second sliding rheostat 713. With the voltage remaining unchanged, the energized current intensity of the electromagnet 710 decreases, and the magnetic force of the electromagnet 710 decreases. The return spring 79 in the stretched state drives the first flexible support rod 60 to reset.

[0032] The segmenting mechanism 8 includes an arc-shaped groove 80 and an arc-shaped groove 81 respectively located at both ends of the limit groove 73. The arc-shaped groove 80 is provided with six arc-shaped transition segments, and the arc-shaped groove 81 is provided with four arc-shaped transition segments. A travel switch 82, a travel switch 83 and a travel switch 84 are installed on the inner wall of the arc-shaped groove 80. A travel switch 85 and a travel switch 86 are installed on the inner wall of the arc-shaped groove 81. Trigger members 87 are respectively provided at both ends of the limit groove 73. The two trigger members 87 are respectively located outside the arc-shaped groove 80 and the arc-shaped groove 81. Multiple stepped sections are respectively provided on the surfaces of the arc-shaped groove 80 and the arc-shaped groove 81. The travel switch 82 and the travel switch 86 are normally closed contacts, which are closed under normal conditions and disconnected when triggered. The travel switch 85, the travel switch 83 and the travel switch 84 are normally open contacts, which are disconnected under normal conditions and closed when triggered; The trigger member 87 includes a moving block 88 slidably connected to the inner wall of the limit groove 73. A chute 89 is formed in the inner wall of the moving block 88. A silica gel block 810 is slidably connected to the inner wall of the chute 89. The silica gel block 810 is slidably connected to the inner wall of the arc-shaped groove 80. A plurality of compression springs 811 are fixedly connected to the outside of the moving block 88, and the compression springs 811 are fixed to the inner wall of the limit groove 73.

[0033] When the guiding contact 70 moves towards the "saddle peak", the guiding contact 70 pushes the limit block 72 to move upward along the inner wall of the limit groove 73. When the limit block 72 moves upward, it squeezes the moving block 88 located above. When the moving block 88 squeezes the compression spring 811, when the moving block 88 slides upward along the inner wall of the limit groove 73, it drives the silica gel block 810 to move upward. The silica gel block 810 is made of silica gel material and has good elasticity. The moving block 88 drives the silica gel block 810 to move upward along the surface of the arc-shaped groove 80. The inner wall of the arc-shaped groove 80 squeezes the silica gel block 810, so that the silica gel block 810 moves in the chute 89 of the moving block 88; When the guiding contact 70 moves towards the "saddle valley", the compression spring 74 in the stretched state drives the limit block 72 to slide downward along the inner wall of the limit groove 73. The limit block 72 squeezes the moving block 88 located below. When the moving block 88 squeezes the compression spring 811, when the moving block 88 slides downward along the inner wall of the limit groove 73, it drives the silica gel block 810 located in the inner wall of the lower moving block 88 to move downward. This silica gel block 810 slides along the inner wall of the arc-shaped groove 81. Under the extrusion of the inner wall of the arc-shaped groove 81, the silica gel block 810 moves along the chute 89 of the moving block 88.

[0034] When the guiding contact 70 is in the "saddle valley" position, the lower moving block 88 is at the lowest position of the arc-shaped groove 81. At this time, the lower compression spring 811 is in a compressed state.

[0035] The surfaces of the first arc-shaped groove 80 and the second arc-shaped groove 81 are respectively provided with a plurality of stepped cross-sections. By setting the stepped cross-sections, the silica gel block 810 can only slide along a predetermined trajectory when sliding on the inner walls of the first arc-shaped groove 80 and the second arc-shaped groove 81.

[0036] The first travel switch 82 and the fourth travel switch 86 are normally closed contacts, which are closed under normal conditions and disconnected when triggered. The second travel switch 85, the third travel switch 83 and the fifth travel switch 84 are normally open contacts, which are disconnected under normal conditions and closed when triggered. The first travel switch 82 and the fourth travel switch 86 are connected in series in the circuit. As long as any one of them is triggered, the entire circuit is immediately disconnected. The second travel switch 85, the third travel switch 83 and the fifth travel switch 84 are connected in parallel to form a branch. As long as any one of them is triggered, the branch is turned on. After the first travel switch 82 and the fourth travel switch 86 are connected in series, they are connected in series with the second travel switch 85, the third travel switch 83 and the fifth travel switch 84 connected in parallel. Only when the first travel switch 82 and the fourth travel switch 86 are not triggered, and at least one of the second travel switch 85, the third travel switch 83 and the fifth travel switch 84 is triggered (closing the branch), the current can pass through the load and the circuit is turned on. At this time, the welding head 6 works and welds the saddle of the steel pipe. And among them, the first travel switch 82, the second travel switch 85, the third travel switch 83, the fourth travel switch 86 and the fifth travel switch 84 are all internally provided with spring dampers 812. The spring damper 812 is composed of a spring and a damper. The spring provides a reset driving force (elastic potential energy is converted into kinetic energy), and the damper consumes kinetic energy through mechanical resistance (such as fluid damping, friction damping) to slow down the rebound speed of the spring, thereby adjusting the reset time. After the silica gel block 810 is separated from the first travel switch 82, the spring damper 812 will make the first travel switch 82 slowly return to the initial state, and the recovery time is the time required for the jaw chuck 30 to rotate one-quarter of a circle.

[0037] That is, the working process is as follows: In the initial state, the welding head 6 is started, and the fifth travel switch 84 is triggered first, and the circuit is connected. The jaw chuck 30 drives the steel pipe to rotate. The weld at the welded part of the steel pipe from the "saddle valley" to the "saddle peak" (1 / 4 elliptical arc) is welded by the working welding head 6. At this time, the saddle opening at the welded part squeezes the guiding contact 70 to move upward, and the limiting block 72 pushes the moving block 88 located above. The moving block 88 drives the silica gel block 810 to slide along the inner wall of the first arc-shaped groove 80. After moving to the "saddle peak" position, the silica gel block 810 triggers the first travel switch 82 located on the inner wall of the first arc-shaped groove 80. At this time, the spring damper 812 built in the fifth travel switch 84 makes the fifth travel switch 84 return to the normally open state, and the circuit of the welding head 6 is disconnected, and the welding head 6 stops welding the saddle opening; As the gripper chuck 30 drives the steel pipe to continue rotating, the "saddle peak" to "saddle valley" of the saddle opening passes through the guiding contact 70. At this time, the compression spring one 74 in the tensile state drives the limiting block 72 to slide downward. At this time, the compression spring two 811 in the compressed state above pushes the upper moving block 88 downward, causing the moving block 88 to drive the silica gel block 810 on its inner wall to continue sliding along the inner wall of the arc-shaped groove one 80. As a result, the silica gel block 810 is separated from the travel switch one 82. The limiting block 72 slides downward along the inner wall of the limiting groove 73 and presses the lower moving block 88. The moving block 88 drives the silica gel block 810 on its inner wall to slide along the inner wall of the arc-shaped groove two 81. When it moves to the "saddle valley" position, the silica gel block 810 triggers the travel switch two 85 located on the inner wall of the arc-shaped groove two 81, and the travel switch two 85 closes. At this time, the spring damper 812 in the travel switch one 82 just makes the travel switch one 82 return to the normally closed state, so that the circuit of the welding head 6 is connected and the welding head 6 is started to cooperate with the welding of the next moving area; As the gripper chuck 30 drives the steel pipe to continue rotating, the area from the "saddle valley" to the "saddle peak" of the saddle opening passes through the guiding contact 70. At this time, the welding head 6 in the working state welds the weld seam in this area. This area is symmetrical to the initial area. The saddle opening at the welding place presses the guiding contact 70 to move upward, and the limiting block 72 pushes the upper moving block 88. The moving block 88 drives the silica gel block 810 to slide along the inner wall of the arc-shaped groove one 80. After moving to the "saddle peak" position, the silica gel block 810 triggers the travel switch three 83 located on the inner wall of the arc-shaped groove one 80. At this time, the built-in spring damper 812 of the travel switch two 85 makes the travel switch two 85 return to the normally open state. After the travel switch three 83 is triggered, the travel switch three 83 closes, the circuit of the welding head 6 is connected, and the welding head 6 is started to cooperate with the welding of the next moving area; As the gripper chuck 30 drives the steel pipe to continue rotating, the "saddle peak" to "saddle valley" of the saddle opening passes through the guiding contact 70. The welding head 6 in the working state welds the weld seam in this area. When it moves to the "saddle valley" position, the silica gel block 810 triggers the travel switch four 86 located on the inner wall of the arc-shaped groove two 81. At this time, the spring damper 812 in the travel switch three 83 just makes the travel switch three 83 return to the normally open state. After the travel switch four 86 is triggered, it is in the off state, the circuit of the welding head 6 is disconnected, and the welding head 6 stops welding the saddle opening. At this time, the gripper chuck 30 has driven the steel pipe to rotate one circle, and 3 / 4 of the area of the saddle opening of the steel pipe has been welded; As the jaw chuck 30 drives the steel pipe to continue rotating, the area from the "saddle valley" to the "saddle peak" of the saddle opening passes through the guiding contact 70. At this time, the welding head 6 does not work, so that the welded saddle opening will not be welded again. When it moves to the "saddle peak" position, the silicone block 810 triggers the travel switch five 84 located on the inner wall of the arc groove one 80. At this time, the built-in spring damper 812 of the travel switch four 86 makes the travel switch four 86 return to the normally closed state. After the travel switch five 84 is triggered, it becomes a closed state, so that the circuit of the welding head 6 is connected, and the welding head 6 is started to cooperate with the welding of the next 1 / 4 saddle opening area to complete the welding of the saddle opening. By dividing the weld seam into several small segments and performing interval welding segment by segment, the welding stress is evenly distributed, stress concentration is avoided, and the shrinkage forces of each part are balanced.

[0038] Embodiment 2 In the second embodiment, other structures remain unchanged. Different from the first embodiment, an adjusting member 34 for adjusting the output power of the welding head 6 according to the thickness of the main steel pipe is provided outside one of the adjusting grooves 31; After the main pipe is fixed by the four limiting rods 33, the wall thickness of the steel pipe is detected by the adjusting member 34, and the output power of the welding head 6 is adjusted according to the wall thickness of the steel pipe.

[0039] The adjusting member 34 includes a baffle 35 fixedly connected to the surface of the jaw chuck 30. A detection plate 36 is slidably connected to the inner wall of the baffle 35. A screw 37 is rotatably connected to the surface of the jaw chuck 30. The screw 37 is threadedly connected to the inner wall of the detection plate 36. An insulating plate one 312 is fixedly connected to the outside of the detection plate 36. A sliding rheostat one 38 is installed on the surface of the jaw chuck 30. The insulating plate one 312 is fixed to the sliding piece in the sliding rheostat one 38. A conductive ring 39 is installed on the surface of the jaw chuck 30. The conductive ring 39 is connected to the sliding rheostat one 38. A conductive seat 310 is installed on the surface of the welding base 1. A conductive piece 311 is installed at one end of the conductive seat 310 close to the conductive ring 39. The conductive ring 39 is located inside the conductive piece 311, and the conductive ring 39 is rotatably connected to the conductive piece 311. The conductive seat 310 is connected to the fixed seat 51; When detecting the wall thickness of the steel pipe, the end of the steel pipe is abutted against the inside of the baffle 35. The worker rotates the screw 37, so that the screw 37 drives the outside detection plate 36 to move, so that the detection plate 36 adheres to the inner wall of the steel pipe, thereby detecting the wall thickness of the steel pipe. When the detection plate 36 moves, the detection plate 36 drives the insulating plate one 312 to move, and the insulating plate one 312 drives the sliding piece in the sliding rheostat one 38 to move. The resistance value of the sliding rheostat one 38 in the circuit increases. Therefore, under the condition that the voltage in the circuit remains unchanged, the current intensity will decrease. According to P = U*I, the output power of the welding head 6 will decrease. When the welding head 6 welds the saddle opening of the steel pipe, the thinner the pipe wall of the steel pipe, the lower the output power of the welding head 6, avoiding the welding deformation of the connection part between the branch pipe and the main pipe caused by the too large output power of the welding head 6.

[0040] When the jaw driving seat 2 drives the jaw plate 30 to rotate, the jaw plate 30 drives the baffle 35, the detection plate 36 and the first sliding rheostat 38 to rotate. The first sliding rheostat 38 drives the conductive ring 39 to rotate. The inside of the conductive ring 39 is composed of electric sheets. The electric sheets in the conductive ring 39 are connected to the first sliding rheostat 38. The electric sheets in the conductive ring 39 are attached to the inner side of the conductive sheet 311. The conductive sheet 311 on the side of the conductive seat 310 close to the conductive ring 39 is annular. When the conductive ring 39 rotates along with the jaw plate 30, the conductive ring 39 rotates on the inner side of the conductive sheet 311, so that when the jaw plate 30 rotates, the first sliding rheostat 38 on the surface of the jaw plate 30 is also kept in electrical connection with the welding head 6.

[0041] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device.

[0042] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A mechanical engineering workpiece welding device, comprising: Welding base; It is characterized in that: it further includes a jaw driving seat, and the jaw driving seat is installed on the welding base; A clamping mechanism, the clamping mechanism is connected to the jaw driving seat, and the jaw driving seat drives the clamping mechanism to rotate; A pipe abutting member, the pipe abutting member is installed on the welding base, and the working surface of the clamping mechanism corresponds to the pipe abutting member; A welding frame, the welding frame is installed on the welding base, and the welding frame is composed of a flexible support arm and a fixed seat; A welding head, a flexible support rod I is fixedly connected to the outside of the welding head, and the flexible support rod I is connected to the welding frame; A guiding mechanism, the guiding mechanism is located on the surface of the welding frame. When the clamping mechanism drives the pipe fitting to rotate, the guiding mechanism contacts the weld seam in advance, and the guiding mechanism adjusts the welding angle of the welding head according to the intersection line trajectory of the steel pipe T-shaped saddle opening; A segmentation mechanism, the segmentation mechanism is connected to the guiding mechanism. When the guiding mechanism moves along the intersection line trajectory of the steel pipe T-shaped saddle opening, the segmentation mechanism adjusts the welding sequence of the welding head.

2. The mechanical engineering workpiece welding device according to claim 1, characterized in that: The clamping mechanism includes a jaw disc, the jaw disc is fixed to the jaw driving seat, two groups of adjustment grooves are formed on the surface of the jaw disc, the two groups of adjustment grooves are symmetrical about the axis of the jaw disc, a plurality of threaded grooves are formed on the inner wall of the adjustment groove, a limiting rod is threadedly connected to the inner wall of the threaded groove, and two limiting rods are threadedly connected in each group of adjustment grooves.

3. The mechanical engineering workpiece welding device according to claim 2, characterized in that: One of the adjustment grooves is provided with an adjustment member for adjusting the output power of the welding head according to the thickness of the main steel pipe. The adjustment member includes a baffle fixedly connected to the surface of the jaw disc, a detection plate is slidably connected to the inner wall of the baffle, a screw rod is rotatably connected to the surface of the jaw disc, the screw rod is threadedly connected to the inner wall of the detection plate, an insulating plate I is fixedly connected to the outside of the detection plate, a sliding rheostat I is installed on the surface of the jaw disc, the insulating plate I is fixed to the sliding piece in the sliding rheostat I, a conductive ring is installed on the surface of the jaw disc, the conductive ring is connected to the sliding rheostat I, a conductive seat is installed on the surface of the welding base, a conductive sheet is installed at one end of the conductive seat close to the conductive ring, the conductive ring is located inside the conductive sheet, the conductive ring is rotatably connected to the conductive sheet, and the conductive seat is connected to the fixed seat.

4. The mechanical engineering workpiece welding device according to claim 1, characterized in that: The guiding mechanism includes a guiding contact head, a flexible support rod II is fixedly connected to the outside of the guiding contact head, a limiting block is fixedly connected to the outside of the flexible support rod II, a limiting groove is formed on the surface of the flexible support arm, the limiting block is slidably connected to the inner wall of the limiting groove, a compression spring I is fixedly connected to the outside of the limiting block, the compression spring I is fixed to the inner wall of the limiting groove, and a guiding member is arranged on the surface of the flexible support arm, and the guiding member is located outside the flexible support rod I.

5. The mechanical engineering workpiece welding device according to claim 4, characterized in that: The guiding member includes a support frame located outside the flexible support rod I, a flexible support rod III is fixedly connected to the outside of the support frame, the flexible support rod III is fixed to the flexible support arm, an iron sheet is fixedly connected to the outside of the flexible support rod I, a reset spring is fixedly connected to the outside of the iron sheet, the reset spring is fixed to the inner wall of the support frame, an electromagnet is fixedly connected to the inner wall of the support frame, and a control member for adjusting the magnetic force of the electromagnet according to the position of the limiting block is arranged outside the limiting block.

6. The mechanical engineering workpiece welding device according to claim 5, characterized in that: The regulating member includes an insulating plate II fixedly connected to the outer side of the limit block. A sliding rheostat II is mounted on the surface of the flexible support arm, and the insulating plate II is fixed to the sliding piece of the sliding rheostat II.

7. The mechanical engineering workpiece welding device according to claim 4, characterized in that: The segmentation mechanism includes an arc groove I and an arc groove II respectively located at both ends of the limit groove. The arc groove I is provided with six arc transition sections, and the arc groove II is provided with four arc transition sections. A travel switch I, a travel switch III, and a travel switch V are mounted on the inner wall of the arc groove I, and a travel switch II and a travel switch IV are mounted on the inner wall of the arc groove II. Triggering members are respectively provided at both ends of the limit groove, and the two triggering members are respectively located outside the arc groove I and the arc groove II.

8. The mechanical engineering workpiece welding device according to claim 7, wherein: The triggering member includes a moving block slidably connected to the inner wall of the limit groove. A chute is formed in the inner wall of the moving block, and a silica gel block is slidably connected to the inner wall of the chute. The silica gel block is slidably connected to the inner wall of the arc groove I. A plurality of compression springs II are fixedly connected to the outer side of the moving block, and the compression springs II are fixed to the inner wall of the limit groove.

9. The mechanical engineering workpiece welding device according to claim 7, characterized in that: A plurality of stepped sections are respectively provided on the surfaces of the arc groove I and the arc groove II.

10. The mechanical engineering workpiece welding device according to claim 7, characterized in that: The travel switch I and the travel switch IV are normally closed contacts, which are closed in the normal state and disconnected when triggered. The travel switch II, the travel switch III, and the travel switch V are normally open contacts, which are disconnected in the normal state and closed when triggered.

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