Eccentric reducing pipe joint welding forming equipment

Abstract

The utility model discloses eccentric reducing pipe joint welding forming equipment, and relates to the technical field of welding equipment. The bed body is arranged in the shell; the fixed clamping and rotating mechanism is fixedly arranged on the lathe bed, and a positioning shaft used for being sleeved with a reducer pipe is clamped on the fixed clamping and rotating mechanism; the movable clamping and rotating mechanism is arranged on the lathe bed in a sliding manner and is used for clamping a small-diameter pipe; the clamping mechanism is mounted on the positioning shaft and can fix the reducer pipe on the positioning shaft; and the welding mechanism is arranged on the lathe bed, the welding mechanism can weld the joint of the small-diameter pipe and the reducer pipe, so that the small-diameter pipe and the reducer pipe form an eccentric reducer pipe, the reducer pipes of different specifications can be clamped and welded, the applicability is wide, and use is convenient.

Description

Technical Field

[0001] The present application relates to the technical field of welding equipment, and in particular to an eccentric reducer pipe joint welding forming equipment. Background Art

[0002] Eccentric reducer is mainly used at the connection of two pipe sections, so as to connect two pipe sections with different diameters into one piece. In the prior art, the reducer and the diameter pipe are welded together by manual welding. Figure 8 and Figure 9 As shown, an eccentric reducer joint is formed, but since one section of the reducer is of reduced diameter and eccentric, the quality of manual welding is not good enough.

[0003] Therefore, it is necessary to provide a welding device that can fix the reducer and has a good fixing effect. Utility Model Content

[0004] In view of this, the present application provides an eccentric reducer pipe joint welding forming equipment to solve the above technical problems.

[0005] To achieve the above objectives, the present invention provides the following technical solutions:

[0006] An eccentric reducing pipe joint welding forming device, comprising:

[0007] case;

[0008] a bed disposed within the shell;

[0009] A fixed clamping and rotating mechanism is fixedly arranged on the bed, wherein the fixed clamping and rotating mechanism clamps a positioning shaft for sleeve-mounting the reducer;

[0010] A movable clamping and rotating mechanism is slidably arranged on the bed, and the movable clamping and rotating mechanism is used to clamp a small diameter pipe;

[0011] A clamping mechanism installed on the positioning shaft, wherein the clamping mechanism is capable of fixing the reducer on the positioning shaft;

[0012] A welding mechanism is provided on the bed, and the welding mechanism can weld the connection between the small-diameter tube and the reducer, so that the small-diameter tube and the reducer form an eccentric reducer.

[0013] Furthermore, the clamping mechanism includes:

[0014] a slide connected to the positioning shaft;

[0015] a wedge slidably connected to the slide;

[0016] a screw assembly connected to the positioning shaft, wherein the screw assembly is movably connected to the wedge block via a connecting assembly;

[0017] A swing assembly movably connected to the positioning shaft, wherein the swing assembly abuts against the screw assembly;

[0018] A pressure head connected to the swing assembly can be supported on the reducer.

[0019] Furthermore, the screw assembly includes:

[0020] a support plate fixed on the positioning shaft;

[0021] a screw rod threadably connected to the support plate, wherein the connecting assembly is connected between one end of the screw rod and the wedge block;

[0022] A handwheel is connected to the other end of the screw.

[0023] Furthermore, the swing assembly includes:

[0024] A vertical plate fixedly connected to the positioning shaft, wherein the vertical plate is spaced apart from the support plate;

[0025] A swing rod is pivotally connected to the vertical plate, one end of the swing rod is equipped with a roller, the roller is supported on the wedge block, the other end of the swing rod is connected to a connecting block, and the connecting block is connected to the pressure head.

[0026] Furthermore, a first tension spring is connected between the support plate and the wedge block, and a second tension spring is connected between the vertical plate and the rocker arm.

[0027] Furthermore, the connection component includes:

[0028] A connecting shaft connected to the screw rod via a set screw;

[0029] a connecting frame connected to the wedge;

[0030] A ball head connected to the connecting shaft can rotate in the connecting frame.

[0031] Furthermore, the fixed clamping and rotating mechanism includes:

[0032] A left vertical plate fixedly arranged on the bed;

[0033] a first stepper motor mounted on the left vertical plate;

[0034] A first three-jaw chuck is connected to the output end of the first stepper motor, and the positioning shaft is clamped by the first three-jaw chuck.

[0035] Furthermore, the mobile clamping and rotating mechanism includes:

[0036] a first cylinder mounted on the bed;

[0037] A right vertical plate is slidably arranged on the bed, and the first cylinder is connected to the right vertical plate;

[0038] A second stepper motor mounted on the right vertical plate;

[0039] A second three-jaw chuck is connected to the output end of the second stepping motor, and the small-diameter tube is clamped by the second three-jaw chuck.

[0040] Furthermore, the welding mechanism includes:

[0041] A T-shaped guide rail fixed to the bed;

[0042] a second cylinder slidably connected to the T-shaped guide rail;

[0043] A welding gun is connected to the second cylinder.

[0044] It can be seen from the above technical solution that the advantages of the utility model are:

[0045] 1. In this application, the small diameter tube is fixed by a three-jaw chuck, while the reducer is fixed by a three-jaw chuck in combination with a positioning shaft. The positioning shaft is first clamped on the three-jaw chuck, and then the reducer is sleeved on the positioning shaft. Finally, the reducer is clamped by operating the clamping mechanism, so that the reducer and the three-jaw chuck can be firmly fixed.

[0046] 2. The positioning shaft is adapted to the small diameter section of the reducer. The positioning shaft is clamped by the first three-jaw chuck, and the small diameter tube is clamped by the second three-jaw chuck. This ensures that the small diameter section and the small diameter tube are coaxial, further improving the welding quality of the connection.

[0047] 3. In this application, the positioning shaft is adapted to the small diameter section of the reducer. When the size of the reducer changes, it is only necessary to replace the positioning shaft with the same inner diameter as the small diameter section. This enables the application to clamp and weld reducers of different specifications. It not only has a wide applicability, but also improves the adaptability of the reducer and the three-jaw chuck. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] The drawings that constitute a part of this application are used to provide further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute improper limitations on this application.

[0049] Figure 1 This is a schematic diagram of the shell structure of this application.

[0050] Figure 2This is a structural diagram of the bed, fixed clamping and rotating mechanism, movable clamping and rotating mechanism, clamping mechanism and welding mechanism of this application.

[0051] Figure 3 This is a schematic structural diagram of the clamping mechanism of this application.

[0052] Figure 4 for Figure 3 A partial enlarged view of point B.

[0053] Figure 5 This is a structural diagram of the welding mechanism of this application.

[0054] Figure 6 for Figure 5 AA view.

[0055] Figure 7 This is a schematic diagram of the structure of the connection component of this application.

[0056] Figure 8 It is a structural schematic diagram of a reducer in the prior art.

[0057] Figure 9 It is a structural schematic diagram of a small diameter tube in the prior art.

[0058] Explanation of reference numerals: 1-housing; 2-visible door panel; 21-handle; 22-sliding door panel; 3-top panel; 4-tool box; 5-controller; 6-bed; 61-first stepper motor; 62-second stepper motor; 621-first cylinder; 63-left vertical plate; 64-first three-jaw chuck; 65-second three-jaw chuck; 66-linear guide rail; 661-slider; 67-right vertical plate; 68-second cylinder; 69-T-type guide rail; 691-slide seat; 692-screw; 7-clamping mechanism; 71-positioning shaft; 72-connecting assembly; 721-connecting frame; 721 1-end cover; 7212-arc surface; 722-connecting shaft; 723-setting screw; 724-ball head; 73-handwheel; 74-support plate; 741-first tension spring; 75-screw; 751-fixing hole; 76-slide; 761-wedge block; 762-slide groove; 77-vertical plate; 771-rocker; 7711-rotating shaft; 772-roller; 773-second tension spring; 78-connecting block; 781-pressure head; 783-rubber pad; 7831-anti-slip protrusion; 8-reducing pipe; 81-large diameter section; 82-small diameter section; 83-small diameter pipe; 9-welding gun. DETAILED DESCRIPTION

[0059] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail in conjunction with the embodiments and drawings. Here, the illustrative embodiments of this application and their descriptions are used to explain this application, but are not intended to limit this application.

[0060] refer to Figures 1 to 9 ,like Figure 1 and Figure 2 As shown, this embodiment provides an eccentric reducer welding and forming device, including: a shell and a bed 6 arranged in the shell, a fixed clamping and rotating mechanism, a movable clamping and rotating mechanism, a clamping mechanism 7 and a welding mechanism. The shell can isolate the external environment from the internal components to improve the safety protection effect during processing. The bed 6 serves as the basic support structure of the equipment, fixing and supporting other components. The fixed clamping and rotating mechanism is fixedly arranged at the left end of the bed 6. The fixed clamping and rotating mechanism clamps a positioning shaft 71. The fixed clamping and rotating mechanism is used to clamp and rotate the positioning shaft 71 to ensure that the reducer 8 remains stable during the welding process. The reducer 8 is sleeved on the positioning shaft 71 to ensure the positioning accuracy of the reducer 8 during welding. The right end of the reducer 8 is a welding end, which is close to the small diameter tube 83 to facilitate welding with the small diameter tube 83; the movable clamping rotating mechanism is slidably set on the right end of the bed 6, and the movable clamping rotating mechanism is used to clamp the small diameter tube 83; the clamping mechanism 7 is installed on the positioning shaft 71, and the clamping mechanism 7 can hold the reducer 8 against and fixed on the positioning shaft 71; the welding mechanism is set on the bed 6, and the welding mechanism is located between the fixed clamping rotating mechanism and the movable clamping rotating mechanism, and the welding mechanism can weld the connection between the small diameter tube 83 and the reducer 8, so that the small diameter tube 83 and the reducer 8 form an eccentric reducer.

[0061] like Figure 8 and Figure 9 As shown, the reducer 8 comprises an integrally connected large-diameter section 81 and a small-diameter section 82. By splicing the small-diameter section 82 with the small-diameter tube 83 and welding the joint, an eccentric reducer capable of connecting two pipe sections is obtained. The reducer 8 is sleeved onto the positioning shaft 71 and secured by the clamping mechanism 7. The small-diameter tube 83 is secured to the movable, clamping, and rotating mechanism.

[0062] like Figure 1 As shown, the housing includes an outer shell 1 and a top plate 3 arranged on the top of the outer shell 1. The outer shell 1 serves as the main protective structure of the device and provides a closed and safe working environment for internal components.

[0063] The front side of the housing 1 is provided with a fixed visual door panel 2 and a movable sliding door panel 22. The sliding door panel 22 is provided with a handle 21 for operating the sliding door panel 22 to move. The visual door panel 2 is fixed to the front side of the housing 1, allowing the operator to observe the working status inside the device without opening the entire front door. The sliding door panel 22 can be moved on the front side of the housing 1, providing a convenient passage to access the interior of the device. The setting of the handle 21 allows the operator to easily move the sliding door panel 22, improving the convenience of operation. The housing 1 is also provided with a toolbox 4 and a controller 5. The toolbox 4 is set on the housing 1 to facilitate the storage and maintenance of tools required for the equipment, making equipment maintenance more convenient and quick. The controller 5 serves as the control center of the equipment. The controller 5 is used to control the operation of the clamping and rotating mechanism, the movable clamping and rotating mechanism, the clamping mechanism 7 and the welding mechanism.

[0064] like Figure 3 As shown, the clamping mechanism 7 includes: a slide 76, a wedge 761, a screw assembly, a swing assembly and a pressure head 781. The slide 76 is fixedly connected to the positioning shaft 71, providing a stable sliding platform for the wedge 761. The wedge 761 is slidably connected in the slide groove 762 of the slide 76 and can move horizontally in the slide groove 762; the screw assembly is fixedly connected to the positioning shaft 71, and the screw assembly is fixedly connected to the positioning shaft 71, ensuring its stability during operation. The screw assembly is connected to the wedge 761 through a connecting assembly 72. When the screw assembly rotates, the wedge 761 is subjected to the force transmitted by the connecting assembly 72 and slides in the slide groove 762; the swing assembly is movably connected to the positioning shaft 71 and can swing within a certain range. The swing assembly counteracts the screw assembly. When the screw assembly rotates and drives the wedge 761 to move, the swing assembly is subjected to the force and swings. The pressure head 781 is connected to the swing assembly, and when the swing assembly swings, the pressure head 781 will move accordingly. The pressure head 781 can be supported on the reducer 8 and tighten the reducer 8 through the pressure applied by it.

[0065] In the embodiment of this application, Figure 3As shown, the screw assembly includes: a support plate 74, a screw 75 and a handwheel 73. The support plate 74 is the fixed part of the screw assembly, which is fixed on the positioning shaft 71. Its main function is to provide a stable platform for supporting and fixing the screw 75. The screw 75 is threadedly connected to the support plate 74, which means that the screw 75 can rotate relative to the support plate 74 and move axially. One end of the screw 75 is connected to the connecting assembly 72, and the other end is connected to the handwheel 73. The connecting assembly 72 is located between one end of the screw 75 and the wedge 761. Its function is to transmit the rotation or axial movement of the screw 75 to the wedge 761. The handwheel 73 is connected to the other end of the screw 75, away from the wedge 761. The main function of the handwheel 73 is to provide a manually operated interface, allowing the user to drive the screw 75 to rotate by rotating the handwheel 73.

[0066] like Figure 7 As shown, the connecting component 72 includes: a connecting shaft 722, a connecting frame 721 and a ball head 724. The connecting shaft 722 is the main part of the connecting component 72. Its left end extends into the fixing hole 751 of the screw 75. It is radially connected to the connecting shaft 722 along the screw 75 through the set screw 723, so that the connecting shaft 722 is locked in the screw 75 to ensure a stable connection between the connecting shaft 722 and the screw 75. The connecting frame 721 is connected to the wedge block 761. Its main function is to serve as an interface to transmit the movement of the screw 75 to the wedge block 761; the ball head 724 is welded to the connecting shaft 722 to form an integral structure. The ball head 724 can rotate in the connecting frame 721. This design may allow the connecting component to have a certain degree of flexibility and adaptability while transmitting motion.

[0067] Specifically, an end cover 7211 is provided at the opening of the connecting frame 721. The ball head 724 is first placed in the connecting frame 721, and then the end cover 7211 is installed so that the ball head 724 can only rotate freely in the connecting frame 721. When the ball head 724 moves in the horizontal direction, it can drive the connecting frame 721 to move synchronously.

[0068] Preferably, an arcuate surface 7212 matching the spherical surface of the ball head 724 is provided on the inner side of the end cover 7211 so that the ball head 724 can rotate without resistance.

[0069] When the screw 75 moves spirally in the support plate 74, the connecting shaft 722 and the ball head 724 move synchronously with the screw 75. Since the end cover 7211 limits the horizontal movement of the ball head 724, the movement of the ball head 724 will drive the connecting frame 721 to move synchronously, thereby causing the screw 75 to move to drive the wedge block 761 to move horizontally along the axial direction of the positioning shaft 71.

[0070] In the embodiment of this application, Figure 3As shown, the swing assembly includes: a vertical plate 77 and a rocker arm 771. The vertical plate 77 is the fixed part of the swing assembly, which is fixedly connected to the positioning shaft 71. The main function of the vertical plate 77 is to provide a stable support platform for installing and supporting the rocker arm 771. The slide 76 is located between the vertical plate 77 and the support plate 74; the middle part of the rocker arm is pivoted to the vertical plate 77 through the rotating shaft 7711, which means that the rocker arm can swing on the vertical plate around the rotating shaft 7711. The left end of the rocker arm 771 is equipped with a roller 772, which is supported on the inclined surface at the bottom of the wedge block 761. When the wedge block 761 moves, it squeezes the roller 772, thereby causing the rocker arm 771 to swing. The right end of the rocker arm 771 is connected to the connecting block 78, which is connected to the pressure head 781. The swing of the rocker arm 771 will drive the connecting block 78 and the pressure head 781 to move together.

[0071] Preferably, a first tension spring 741 is connected between the support plate 74 and the wedge block 761, and the first tension spring 741 is used to assist the wedge block 761 in resetting. A second tension spring 773 is connected between the vertical plate 77 and the left end of the rocker arm 771, and the connection point of the second tension spring 773 on the rocker arm 771 is located between the rotating shaft 7711 and the roller 772. The second tension spring 773 is used to assist the rocker arm 771 in resetting, thereby making it easier and more labor-saving to operate the clamping mechanism 7.

[0072] When the screw 75 drives the wedge 761 to move right, the wedge 761 exerts a downward pressure on the roller 772, causing the rocker 771 to swing counterclockwise. The swing of the rocker 771 drives the connecting block 78 and the pressure head 781 to move upward. The pressure head 781 then swings upward and presses against the small diameter section 82 of the reducer 8, thereby tightening the reducer 8. To release the tightening of the reducer 8, the screw 75 can be reversed to move the wedge 761 to the left. The roller 772 is no longer squeezed, the second tension spring 773 is reset, the rocker 771 returns to its original position, and the pressure head 781 also leaves the reducer 8.

[0073] like Figure 4 As shown, the pressure head 781 has an arc-shaped cavity to adapt to the circumferential surface of the small diameter section 82. The curvature of the arc-shaped cavity matches the outer diameter of the small diameter section 82 to ensure a close fit during the pressing process, thereby improving the pressing effect. A rubber pad 783 is provided in the arc-shaped cavity to protect the small diameter section 82 from being crushed and scratched. The rubber pad 783 is provided in the arc-shaped cavity, and its main purpose is to protect the small diameter section 82. The rubber material has good elasticity and wear resistance, and can effectively prevent the small diameter section 82 from being crushed or scratched during the pressing process. The rubber pad 783 is provided with a number of anti-slip protrusions 7831 for increasing the anti-slip effect. These anti-slip protrusions 7831 can increase the friction between the rubber pad 783 and the pressed object, thereby improving the anti-slip effect.

[0074] like Figure 2 As shown, the fixed clamping and rotating mechanism includes: a left vertical plate 63, a first stepper motor 61 and a first three-jaw chuck 64. The left vertical plate 63 is fixedly arranged on the bed 6; the first stepper motor 61 is installed on the left vertical plate 63; the first three-jaw chuck 64 is connected to the output end of the first stepper motor 61, and the positioning shaft 71 is clamped by the first three-jaw chuck 64. The first three-jaw chuck 64 can clamp positioning shafts 71 of different diameters and has wide adaptability, so that the positioning shaft 71 can be used in conjunction with the small diameter section 82.

[0075] like Figure 2 As shown, the moving clamping and rotating mechanism includes: a first cylinder 621, a right vertical plate 67, a second stepper motor 62 and a second three-jaw chuck 65. The first cylinder 621 is installed on the bed 6; a linear slide rail 66 is provided on the bed 6, and a slider 661 that slides with the linear slide rail 66 is provided at the bottom of the right vertical plate 67. The first cylinder 621 is connected to the right vertical plate 67; the second stepper motor 62 is installed on the right vertical plate 67; the second three-jaw chuck 65 is connected to the output end of the second stepper motor 62, and the right end of the small diameter tube 83 is clamped by the second three-jaw chuck 65.

[0076] like Figure 2 and Figure 5 As shown, the welding mechanism includes: a T-shaped guide rail 69, a second cylinder 68 and a welding gun 9, the T-shaped guide rail 69 is fixed on the bed 6; the second cylinder 68 is slidably connected to the T-shaped guide rail 69; the welding gun 9 is connected to the second cylinder 68, and the welding gun 9 is connected to the carbon dioxide gas shielded welding machine.

[0077] like Figure 5 and Figure 6 As shown, a slide 691 is provided at the bottom of the second cylinder 68 and is slidably connected to the T-shaped guide rail 69. A screw 692 is provided on the rear side of the slide 691. By tightening the screw 692, the screw 692 is pressed against the T-shaped guide rail 69, thereby fixing the position between the slide 691 and the T-shaped guide rail 69.

[0078] Working principle: Fix the reducer 8 and the small diameter tube 83 respectively. After fixing, the first cylinder 621 drives the right vertical plate 67 to move to the left so that the left end of the small diameter tube 83 is connected with the right end of the small diameter section 82. The connection is the welding position. Then the second cylinder 68 moves to the bottom of the connection through the slide 691 and is locked by the screw 692. The second cylinder 68 starts to drive the welding gun 9 to move up to the connection. The welding gun 9 starts to weld the connection. At the same time, the first stepper motor 61 and the second stepper motor 62 are started synchronously, so that the reducer 8 and the small diameter tube 83 rotate synchronously to perform 360° welding on the connection.

[0079] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Those skilled in the art will appreciate that various modifications and variations of the present embodiment are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. An eccentric reducer pipe joint welding forming equipment, characterized in that, include: case; A bed (6) disposed within the shell; A fixed clamping and rotating mechanism fixedly arranged on the bed (6), wherein the fixed clamping and rotating mechanism clamps a positioning shaft (71) for sleeve-mounting the reducer (8); a movable clamping and rotating mechanism slidably arranged on the bed (6), the movable clamping and rotating mechanism being used to clamp a small diameter tube (83); a clamping mechanism (7) mounted on the positioning shaft (71), wherein the clamping mechanism (7) is capable of fixing the reducer (8) on the positioning shaft (71); A welding mechanism is provided on the bed (6), and the welding mechanism is capable of welding the connection between the small-diameter tube (83) and the reducer (8), so that the small-diameter tube (83) and the reducer (8) form an eccentric reducer.

2. The eccentric reducer welding forming equipment according to claim 1, characterized in that: The clamping mechanism (7) comprises: A slide (76) connected to the positioning shaft (71); a wedge (761) slidably connected to the slide (76); a screw assembly connected to the positioning shaft (71), the screw assembly being movably connected to the wedge (761) via a connecting assembly (72); A swing assembly movably connected to the positioning shaft (71), wherein the swing assembly abuts against the screw assembly; A pressure head (781) connected to the swing assembly, wherein the pressure head (781) can be supported on the reducer (8).

3. The eccentric reducer pipe joint welding forming equipment according to claim 2, characterized in that: The screw assembly comprises: a support plate (74) fixed on the positioning shaft (71); a screw rod (75) threadedly connected to the support plate (74), the connecting assembly (72) being connected between one end of the screw rod (75) and the wedge block (761); A hand wheel (73) is connected to the other end of the screw (75).

4. The eccentric reducer welding forming equipment according to claim 3, characterized in that: The swing assembly comprises: a vertical plate (77) fixedly connected to the positioning shaft (71), the vertical plate (77) being spaced apart from the support plate (74); A swing rod (771) is pivotally connected to the vertical plate (77), one end of the swing rod (771) is mounted with a roller (772), the roller (772) abuts against the wedge block (761), and the other end of the swing rod (771) is connected to a connecting block (78), the connecting block (78) being connected to the pressure head (781).

5. The eccentric reducer welding forming equipment according to claim 4, characterized in that: A first tension spring (741) is connected between the support plate (74) and the wedge block (761), and a second tension spring (773) is connected between the vertical plate (77) and the rocker (771).

6. The eccentric reducer pipe joint welding forming equipment according to claim 2, characterized in that: The connecting assembly (72) includes: A connecting shaft (722) connected to the screw rod (75) via a set screw (723); a connecting frame (721) connected to the wedge (761); A ball head (724) connected to the connecting shaft (722), wherein the ball head (724) is capable of rotating within the connecting frame (721).

7. The eccentric reducer welding forming equipment according to claim 1, characterized in that: The fixed clamping and rotating mechanism comprises: A left vertical plate (63) fixedly arranged on the bed (6); a first stepper motor (61) mounted on the left vertical plate (63); A first three-jaw chuck (64) is connected to the output end of the first stepper motor (61), and the positioning shaft (71) is clamped by the first three-jaw chuck (64).

8. The eccentric reducer welding forming equipment according to claim 7, characterized in that: The mobile clamping and rotating mechanism comprises: A first cylinder (621) mounted on the bed (6); A right vertical plate (67) is slidably arranged on the bed (6), and the first cylinder (621) is connected to the right vertical plate (67); A second stepper motor (62) mounted on the right vertical plate (67); A second three-jaw chuck (65) is connected to the output end of the second stepping motor (62), and the small-diameter tube (83) is clamped by the second three-jaw chuck (65).

9. The eccentric reducer pipe joint welding and forming equipment according to claim 1, characterized in that: The welding mechanism comprises: A T-shaped guide rail (69) fixed on the bed (6); a second cylinder (68) slidably connected to the T-shaped guide rail (69); A welding gun (9) is connected to the second cylinder (68).

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