Circular tube self-adaptive welding machine

Abstract

The utility model discloses a circular tube self-adaptive welding machine, which relates to the technical field of welding machines and comprises a circular ring, a fixing mechanism, an annular moving mechanism and a distance control mechanism, the fixing mechanism and the annular moving mechanism are both arranged on the circular ring, and the distance control mechanism is in transmission connection with the annular moving mechanism and is in transmission connection with a welding gun. The fixing mechanism is used for fixing the circular ring to the outer wall of a circular pipe to be welded. The annular moving mechanism is used for driving the distance control mechanism to annularly move around the central axis of the circular ring so that the welding gun can complete annular welding. The distance control mechanism enables a distance to always exist between the gun head of the welding gun and the outer wall of the circular pipe. The fixing mechanism is convenient for fixing the circular ring on the circular tube; the annular moving mechanism can enable the welding gun to annularly move around the central axis of the circular pipe so as to complete annular welding; the distance control mechanism can enable the gap between the gun head of the welding gun and the outer wall of the round pipe to be a constant value, so that welding of the welding gun is not affected by the surface structure of the welding position, and the welding quality of the welding gun is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of welding machines, in particular to a round tube adaptive welding machine. Background Art

[0002] The field of welding involves welding various structures. When it comes to circular welding on the outer wall of a round tube, especially a large-diameter round tube, the traditional method is usually to fix the welding gun and manually rotate the round tube to achieve welding. However, for large-diameter round tubes, manual rotation becomes difficult, and it is difficult to ensure the consistency of welding quality when manually welding the weld around the entire circumference.

[0003] In order to solve the above problems, some welding devices that can perform circular welding on the outer wall of a circular tube have appeared on the market. Such devices generally include a circular track and a welding gun installed on the circular track. After the circular track is fixed on the outer wall of the circular tube, the welding gun is driven by a corresponding driving mechanism to perform circular motion around the central axis of the circular tube to achieve circular welding.

[0004] The above design can solve the problem of manually rotating the round tube, but in practical applications, the following problems still exist: it is inconvenient to keep a distance between the gun tip of the welding gun and the welding position during welding. If the welding position of the round tube is partially deformed, resulting in depressions or bulges on the round tube, the gun tip of the welding gun may be closer or farther from the welding position due to the ovality of the pipe, thus affecting the welding quality. Utility Model Content

[0005] The utility model aims to overcome the deficiencies of the prior art and provide a round tube adaptive welding machine.

[0006] The purpose of this utility model is achieved through the following technical solutions:

[0007] A circular tube adaptive welding machine comprises a circular ring, a fixing mechanism and an annular moving mechanism both arranged on the circular ring, and a distance control mechanism transmission-connected to the annular moving mechanism, wherein the distance control mechanism is transmission-connected to a welding gun, and the fixing mechanism is used to fix the circular ring on the outer wall of the circular tube to be welded; the annular moving mechanism is used to drive the distance control mechanism to perform annular movement around the central axis of the circular ring so that the welding gun completes annular welding; the distance control mechanism ensures that there is always a distance between the gun head of the welding gun and the outer wall of the circular tube.

[0008] Furthermore, in the utility model, the annular moving mechanism includes a gear ring and an annular guide rail both arranged on the circular ring, a movable frame slidably connected to the annular guide rail, and a driving mechanism arranged on the movable frame, and the distance control mechanism is arranged on the movable frame; the central axis of the gear ring and the central axis of the annular guide rail are both colinear with the central axis of the circular ring; the driving mechanism cooperates with the gear ring to drive the movable frame to make a circular movement around the central axis of the circular ring on the annular guide rail.

[0009] Furthermore, in the utility model, the above-mentioned distance control mechanism includes an axial displacement control mechanism arranged on the above-mentioned movable frame, and a radial displacement control mechanism transmission-connected to the above-mentioned axial displacement control mechanism, and the above-mentioned welding gun is transmission-connected to the above-mentioned radial displacement control mechanism; the above-mentioned axial displacement control mechanism is used to control the displacement of the above-mentioned radial displacement control mechanism in the direction of the center axis of the above-mentioned circular ring; the above-mentioned radial displacement control mechanism is used to control the displacement amount of the above-mentioned welding gun along the radial direction of the above-mentioned circular ring, so that the gap between the gun head of the above-mentioned welding gun and the outer wall of the circular tube is a constant value.

[0010] Further, in the utility model, the above-mentioned axial displacement control mechanism includes a cantilever arranged on the above-mentioned movable frame, a first servo arranged on the above-mentioned cantilever, a screw rod rotatably arranged on the above-mentioned cantilever and a slide plate slidably arranged on the above-mentioned cantilever, the above-mentioned screw rod is transmission-connected to the above-mentioned first servo, the above-mentioned slide plate is threadedly connected to the above-mentioned screw rod, the central axis of the above-mentioned screw rod and the sliding direction of the above-mentioned slide plate are both parallel to the central axis of the above-mentioned ring; the above-mentioned radial displacement control mechanism is arranged on the above-mentioned slide plate.

[0011] Furthermore, in the utility model, the radial displacement control mechanism includes a slider slidably connected to the slide plate, a guide rod and a limit rod both arranged on the slider, and a spring sleeved on the guide rod, and the welding gun is arranged on the slider; the central axis of the guide rod and the central axis of the limit rod are parallel to each other, and are both parallel to the corresponding radial directions of the circular ring; the spring enables the welding gun to make a circular motion around the central axis of the circular ring, and the free end of the limit rod is always in contact with the outer wall of the circular tube, and at this time there is a gap between the gun head of the welding gun and the outer wall of the circular tube.

[0012] Furthermore, in the utility model, the driving mechanism comprises a second steering gear arranged on the movable frame and a first gear arranged on an output shaft of the second steering gear, and the first gear is always meshed with the ring gear.

[0013] Furthermore, in the present invention, the fixing mechanism comprises three groups of telescopic legs spaced apart on the circular ring, and the three groups of telescopic legs are distributed in a circular array about the central axis of the circular ring.

[0014] Further, in the present utility model, any of the above telescopic legs includes a straight rack slidably disposed on the above-mentioned ring and a third servo motor disposed on the above-mentioned ring. The extending direction and the sliding direction of the straight rack are parallel, and both are parallel to the corresponding radial direction of the above-mentioned ring. A second gear that is always engaged with the above-mentioned straight rack is disposed on the output shaft of the above-mentioned third servo motor.

[0015] Further, in the present utility model, a first roller is rotatably disposed at the free end of the above-mentioned limiting rod. When the above-mentioned welding torch makes a circular motion around the central axis of the above-mentioned ring, the above-mentioned first roller is always in contact with the outer wall of the above-mentioned circular tube.

[0016] Further, in the present utility model, annular grooves are formed on two opposite side walls of the above-mentioned annular guide rail. The central axis of any of the above-mentioned annular grooves is collinear with the central axis of the above-mentioned ring; two second rollers are rotatably disposed at intervals on the above-mentioned moving frame, and the two above-mentioned second rollers are respectively slidably connected to the two above-mentioned annular grooves.

[0017] The beneficial effects of the present utility model are as follows:

[0018] The present utility model provides a circular tube adaptive welding machine. The fixing mechanism facilitates fixing the ring on the circular tube; the annular moving mechanism can make the welding torch move circularly around the central axis of the circular tube to complete circular welding; the distance control mechanism can make the gap between the tip of the welding torch and the outer wall of the circular tube a constant value, so that the welding of the welding torch is not affected by the surface structure of the welding position, thereby improving its welding quality. Description of the Drawings

[0019] Figure 1 It is a schematic structural diagram of the adaptive welding machine according to an embodiment of the present utility model installed on a circular tube;

[0020] Figure 2 It is a schematic structural diagram of the distance control mechanism according to an embodiment of the present utility model;

[0021] Figure 3 is Figure 1 the left view of;

[0022] Figure 4 It is a schematic structural diagram of the telescopic leg according to an embodiment of the present utility model;

[0023] Figure 5 It is a schematic installation structure diagram of two second rollers according to an embodiment of the present utility model.

[0024] In the figure: 101-circular ring; 201-welding gun; 301-circular tube; 401-gear ring; 501-annular guide rail; 502-moving frame; 503-second servo; 504-first gear; 601-cantilever; 602-first servo; 603-screw rod; 604-slide plate; 605-slider; 606-guide rod; 607-limit rod; 608-spring; 701-spur rack; 702-third servo; 703-second gear; 801-first roller; 901-second roller. DETAILED DESCRIPTION

[0025] The following will be combined with the embodiments to clearly and completely describe the technical solution of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0026] See also Figures 1 - 5 , the utility model provides a technical solution:

[0027] A self-adaptive welding machine for a circular tube 301 comprises a circular ring 101, a fixing mechanism and an annular moving mechanism both mounted on the circular ring 101, and a distance control mechanism transmission-connected to the annular moving mechanism, wherein the distance control mechanism is transmission-connected to a welding gun 201, and the fixing mechanism is used to fix the circular ring 101 on the outer wall of the circular tube 301 to be welded; the annular moving mechanism is used to drive the distance control mechanism to perform annular movement around the central axis of the circular ring 101 so that the welding gun 201 completes annular welding; the distance control mechanism ensures that there is always a gap between the gun head of the welding gun 201 and the outer wall of the circular tube 301, and in this embodiment, the gap between the gun head of the welding gun 201 and the weld on the outer wall of the circular tube 301 is 2-3 mm.

[0028] Preferably, the annular moving mechanism in this embodiment includes a gear ring 401 and an annular guide rail 501, both of which are installed on the circular ring 101, a mobile frame 502 slidably connected to the annular guide rail 501, and a driving mechanism installed on the mobile frame 502, and the distance control mechanism is installed on the mobile frame 502. During installation, the central axis of the gear ring 401 and the central axis of the annular guide rail 501 are both in line with the central axis of the circular ring 101. The driving mechanism cooperates with the gear ring 401 to drive the mobile frame 502 to do annular movement around the central axis of the circular ring 101 on the annular guide rail 501. In this embodiment, the driving mechanism includes a second steering gear 503 installed on the mobile frame 502 and a first gear 504 installed on the output shaft of the second steering gear 503, and the first gear 504 is always engaged with the gear ring 401.

[0029] Main reference Figure 5In order to facilitate the sliding connection between the mobile frame 502 and the annular guide rail 501, annular grooves (not marked in the figure) are provided on two opposite side walls of the annular guide rail 501 in this embodiment, and the central axis of any annular groove is collinear with the central axis of the ring 101. Two second rollers 901 are installed on the mobile frame 502 for rotation at intervals, and the two second rollers 901 are respectively slidably connected with the two annular grooves.

[0030] In this way, when the movable frame 502 makes a circular motion around the central axis of the ring 101 when needed, the second servo 503 is started to drive the first gear 504 to rotate. Since the first gear 504 is always meshed with the ring gear 401, the movable frame 502 will make a circular motion around the central axis of the ring 101 under the action of the ring gear 401, thereby driving the welding gun 201 to make a circular motion around the central axis of the ring 101.

[0031] Preferred, mainly refer to Figure 2 In this embodiment, the distance control mechanism includes an axial displacement control mechanism installed on the mobile frame 502, and a radial displacement control mechanism transmission-connected to the axial displacement control mechanism, and the welding gun 201 is transmission-connected to the radial displacement control mechanism; the axial displacement control mechanism is used to control the displacement of the radial displacement control mechanism in the direction of the central axis of the ring 101; the radial displacement control mechanism is used to control the displacement of the welding gun 201 in the radial direction of the ring 101, so that the gap between the gun head of the welding gun 201 and the outer wall of the circular tube 301 is a constant value.

[0032] Specific, mainly refer to Figure 2 In this embodiment, the axial displacement control mechanism includes a cantilever 601 installed on the mobile frame 502, a first steering gear 602 installed on the cantilever 601, a screw rod 603 rotatably installed on the cantilever 601, and a slide plate 604 slidably installed on the cantilever 601, the screw rod 603 is transmission-connected with the first steering gear 602, the slide plate 604 is threadedly connected with the screw rod 603, the central axis of the screw rod 603 and the sliding direction of the slide plate 604 are both parallel to the central axis of the ring 101; the radial displacement control mechanism is installed on the slide plate 604. The radial displacement control mechanism includes a slider 605 slidably connected to the slide plate 604, a guide rod 606 and a limit rod 607 both mounted on the slider 605, and a spring 608 sleeved on the guide rod 606, and the welding gun 201 is mounted on the slider 605; the central axis of the guide rod 606 and the central axis of the limit rod 607 are parallel to each other, and are both parallel to the corresponding radial directions of the ring 101; the spring 608 ensures that when the welding gun 201 performs a circular motion around the central axis of the ring 101, the free end of the limit rod 607 is always in contact with the outer wall of the circular tube 301, and at this time there is a gap between the gun head of the welding gun 201 and the outer wall of the circular tube 301.

[0033] from Figure 2From the perspective of [description], the spring 608 is installed in such a way that the bottom end of the spring 608 is connected to the slider 605, and its top end is connected to the cantilever 601. Under the elastic force of the spring 608, the slider 605 always has a tendency to move downward and always has a tendency to move towards the outer wall of the circular tube 301, so that the bottom end of the limit rod 607 always abuts against the outer wall of the circular tube 301. The installation position of the limit rod 607 should be such that when the limit rod 607 abuts against the outer wall of the circular tube 301, there is a gap between the tip of the welding torch 201 and the outer wall of the circular tube 301.

[0034] To achieve the sliding connection between the slide plate 604 and the cantilever 601, in this embodiment, a guiding groove (not shown in the figure) is provided on the cantilever 601. The extending direction of the guiding groove is parallel to the central axis of the lead screw 603, and the slide plate 604 is slidably connected to this guiding groove. In this way, when the lead screw 603 rotates, due to the limitation of the guiding groove, the slide plate 604 cannot rotate around the central axis of the lead screw 603, and the slide plate 604 can only reciprocate in the direction of the central axis of the lead screw 603.

[0035] From Figure 2 From the perspective of [description], after the circular ring 101 is fixed on the circular tube 301 by the fixing mechanism, if the tip of the welding torch 201 is not aligned with the weld on the circular tube 301, the first servo motor 602 can be started at this time to drive the lead screw 603 to rotate. The slide plate 604 can move in the left-right direction under the drive of the lead screw 603 until the tip of the welding torch 201 is aligned with the weld on the circular tube 301. Then, due to the existence of the radial displacement control mechanism, no matter where the welding torch 201 moves to, there is always a gap between the tip of the welding torch 201 and the outer wall of the circular tube 301, so as to facilitate the welding of the weld on the circular tube 301 by the welding torch 201.

[0036] At the same time, in order to reduce the friction between the limit rod 607 and the outer wall of the circular tube 301 when the limit rod 607 makes a circular movement around the central axis of the circular tube 301, a first roller 801 is rotatably installed at the free end of the limit rod 607 in this embodiment, and when the welding torch 201 makes a circular movement around the central axis of the circular ring 101, the first roller 801 always abuts against the outer wall of the circular tube 301. In this way, the friction between the limit rod 607 and the outer wall of the circular tube 301 becomes rolling friction, making the movement of the limit rod 607 smoother.

[0037] Preferably, in this embodiment, the fixing mechanism includes three sets of telescopic legs installed on the ring 101 at intervals, and the three sets of telescopic legs are circumferentially arrayed about the central axis of the ring 101. Any telescopic leg includes a straight rack 701 slidably installed on the ring 101 and a third servo 702 installed on the ring 101. The extending direction and the sliding direction of the straight rack 701 are parallel and both parallel to the corresponding radial direction of the ring 101. A second gear 703 that is always meshed with the straight rack 701 is installed on the output shaft of the third servo 702. In addition, an anti-slip block 605 (not marked in the figure) is installed at one end of each rack close to the center of the ring 101.

[0038] After the ring 101 is sleeved on the round tube 301 to be welded in this way, the three third servos 702 respectively control the three straight racks 701 to move, so that each anti-slip block 605 abuts against the outer wall of the round tube 301, thereby fixing the ring 101 on the outer wall of the round tube 301.

[0039] In other embodiments of this embodiment, the number of telescopic legs can also be two groups, four groups or multiple groups. If there are two groups, the installation method of the two groups of telescopic legs is preferably: the two groups of telescopic legs are symmetrically distributed about the central axis of the ring 101, and each anti-slip block 605 should be an arc-shaped structure adapted to the round tube 301 to facilitate better clamping of the round tube 301.

[0040] The above are only the preferred embodiments of the present invention. It should be understood that the present invention is not limited to the forms disclosed herein, should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be changed within the scope of the concept described herein through the above teachings or the technology or knowledge in related fields. And the changes and modifications made by those skilled in the art without departing from the spirit and scope of the present invention should all be within the protection scope of the appended claims of the present invention.

Claims

1. A round tube adaptive welding machine, characterized in that: The invention comprises a circular ring (101), a fixing mechanism and an annular moving mechanism both arranged on the circular ring (101), and a distance control mechanism drivingly connected to the annular moving mechanism, the distance control mechanism drivingly connected to a welding gun (201), the fixing mechanism being used to fix the circular ring (101) on the outer wall of a circular tube (301) to be welded; the annular moving mechanism being used to drive the distance control mechanism to move in an annular manner around the central axis of the circular ring (101) so that the welding gun (201) completes annular welding; the distance control mechanism ensures that there is always a distance between the gun head of the welding gun (201) and the outer wall of the circular tube (301).

2. A round tube adaptive welding machine according to claim 1, characterized in that: The annular moving mechanism comprises a gear ring (401) and an annular guide rail (501) both arranged on the circular ring (101), a moving frame (502) slidably connected to the annular guide rail (501), and a driving mechanism arranged on the moving frame (502); the distance control mechanism is arranged on the moving frame (502); the central axis of the gear ring (401) and the central axis of the annular guide rail (501) are both colinear with the central axis of the circular ring (101); the driving mechanism cooperates with the gear ring (401) to drive the moving frame (502) to perform annular movement on the annular guide rail (501) around the central axis of the circular ring (101).

3. A round tube adaptive welding machine according to claim 2, characterized in that: The distance control mechanism comprises an axial displacement control mechanism arranged on the movable frame (502), and a radial displacement control mechanism which is transmission-connected to the axial displacement control mechanism, and the welding gun (201) is transmission-connected to the radial displacement control mechanism; the axial displacement control mechanism is used to control the displacement of the radial displacement control mechanism in the direction of the central axis of the circular ring (101); the radial displacement control mechanism is used to control the displacement of the welding gun (201) in the radial direction of the circular ring (101), so that the gap between the gun head of the welding gun (201) and the outer wall of the circular tube (301) is a constant value.

4. A round tube adaptive welding machine according to claim 3, characterized in that: The axial displacement control mechanism comprises a cantilever (601) arranged on the moving frame (502), a first steering gear (602) arranged on the cantilever (601), a screw rod (603) rotatably arranged on the cantilever (601), and a slide plate (604) slidably arranged on the cantilever (601), the screw rod (603) being transmission-connected to the first steering gear (602), the slide plate (604) being threadedly connected to the screw rod (603), the central axis of the screw rod (603) and the sliding direction of the slide plate (604) being parallel to the central axis of the ring (101); and the radial displacement control mechanism is arranged on the slide plate (604).

5. The round tube adaptive welding machine according to claim 4, characterized in that: The radial displacement control mechanism comprises a slider (605) slidably connected to the slide plate (604), a guide rod (606) and a limit rod (607) both arranged on the slider (605), and a spring (608) sleeved on the guide rod (606); the welding gun (201) is arranged on the slider (605); the central axis of the guide rod (606) and the central axis of the limit rod (607) are parallel to each other and are both parallel to the corresponding radial directions of the circular ring (101); the spring (608) ensures that when the welding gun (201) performs a circular motion around the central axis of the circular ring (101), the free end of the limit rod (607) always abuts against the outer wall of the circular tube (301), and at this time, there is a gap between the gun head of the welding gun (201) and the outer wall of the circular tube (301).

6. The round tube adaptive welding machine according to claim 2, characterized in that: The driving mechanism comprises a second steering gear (503) arranged on the moving frame (502) and a first gear (504) arranged on an output shaft of the second steering gear (503); the first gear (504) is always in mesh with the gear ring (401).

7. The round tube adaptive welding machine according to claim 1, characterized in that: The fixing mechanism comprises three groups of telescopic legs arranged at intervals on the circular ring (101), and the three groups of telescopic legs are distributed in a circular array about the central axis of the circular ring (101).

8. The round tube adaptive welding machine according to claim 7, characterized in that: Any of the telescopic legs comprises a spur rack (701) slidably arranged on the circular ring (101) and a third steering gear (702) arranged on the circular ring (101); the extension direction and the sliding direction of the spur rack (701) are parallel and are both parallel to the corresponding radial direction of the circular ring (101); and a second gear (703) that is always meshed with the spur rack (701) is arranged on the output shaft of the third steering gear (702).

9. The round tube adaptive welding machine according to claim 5, characterized in that: A first roller (801) is rotatably provided at the free end of the limiting rod (607), and when the welding gun (201) performs a circular motion around the central axis of the circular ring (101), the first roller (801) always abuts against the outer wall of the circular tube (301).

10. The round tube adaptive welding machine according to claim 2, characterized in that: The annular guide rail (501) has annular grooves on two opposite side walls, and the central axis of any of the annular grooves is collinear with the central axis of the circular ring (101); the movable frame (502) has two second rollers (901) arranged to rotate at intervals, and the two second rollers (901) are respectively slidably connected to the two annular grooves.

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