Adjustable centering mechanism for welding outer weld joint of pore plate stay tube

Abstract

The utility model discloses an adjustable centering mechanism for welding an outer weld joint of a pore plate stay tube, which is characterized in that three support arms of a support are arranged in a regular triangle star shape, support blocks are respectively fixed below the outer ends of the three support arms, and a support wheel is respectively fixed on each support block; the axes of the three supporting wheels are parallel to the axes of the corresponding supporting arms and are distributed in a central symmetry mode. A lead screw extending upwards is fixedly connected to the center of the support, a coupler is arranged at the upper end of the lead screw, an adjusting nut is screwed to the middle section of the lead screw, a clamping sleeve is fixed below the adjusting nut, three connecting rods are symmetrically hinged to the circumference of the clamping sleeve, and short shafts are hinged to the lower ends of the connecting rods respectively. The short shafts penetrate through the hollowed-out adjusting grooves of the corresponding supporting arms respectively, positioning bearings are fixed to the lower ends of the short shafts respectively, and the positioning bearings are distributed in a central symmetry mode with the axis of the lead screw as the center. The mechanism can provide accurate in-pipe positioning for the welding gun, and even if the inner diameter of the pull pipe has deviation, the mechanism cannot cause adverse effects on centering of the welding gun, and the welding quality is high.

Description

Technical Field

[0001] The utility model relates to a welding tool, in particular to an adjustable centering mechanism for welding the outer weld of a hole plate drawn tube, belonging to the technical field of welding equipment. Background Art

[0002] Heat exchangers and other equipment require a large number of pipe openings to be welded on orifice plates. The pipe heads extend from the holes of the orifice plates, and the holes are provided with grooves that are wide outside and narrow inside. For pressure vessels, due to the deep grooves, welding requirements are also high. Usually, four passes are required to weld the outer periphery of each pipe head, and the welding workload is very large. Traditionally, manual welding is used. For a large number of repetitive tasks, the labor intensity of manual work is high, the efficiency is low, and the quality of the welds is unstable, which is closely related to the quality of the welders. The appearance of manual welds is relatively poor.

[0003] The Chinese utility model patent with the publication number CN 220782703U discloses a welding mechanism for the outer weld of the pipe. The outer weld of the pipe mouth of the drawn pipe welding uses a centering cover plate, which covers the pipe mouth of the welded pipe. The lower end of the positioning ejector is inserted into the center hole of the cover plate, and the inner wall of the pipe is used to provide centering for the welding equipment. When the tool is working, there are the following defects: 1. The size of the centering cover plate is fixed and cannot be adjusted. Draw pipes of different diameters require centering covers of corresponding specifications; 2. There are deviations in the inner diameters of the same specification of different batches of drawn pipes, which causes deviations in the positioning of the centering cover plate. During the welding process, the position of the welding gun needs to be manually adjusted from time to time, affecting the welding efficiency and quality. Utility Model Content

[0004] The purpose of the utility model is to overcome the problems existing in the prior art and provide an adjustable centering mechanism for welding the outer weld of a orifice plate drawn tube, which is used for welding between the outer periphery of the welded tube and the orifice plate, can provide accurate positioning in the tube for the welding gun, and even if there is a deviation in the inner diameter of drawn tubes of the same specification but different batches, it will not cause adverse effects on the centering of the welding gun, and the welding quality is high.

[0005] In order to solve the above technical problems, the utility model provides an adjustable centering mechanism for welding the outer weld of a orifice plate drawn tube, comprising a support, wherein the support comprises three support arms, the three support arms are arranged in a regular triangle star shape and the inner ends are connected as a whole, support blocks are respectively fixed below the outer ends of the three support arms, and support wheels are respectively fixed on each support block, and the axes of the three support wheels are parallel to the axes of the corresponding support arms and are centrally symmetrically distributed;

[0006] The center of the support is fixedly connected with a screw rod extending upward, the upper end of the screw rod is provided with a coupling and the middle section of the screw rod is screwed with an adjusting nut, a jacket is fixed below the adjusting nut, three connecting rods are symmetrically hinged on the circumference of the jacket, and a short shaft is hinged at the lower end of each connecting rod, each short shaft passes through the hollow adjustment groove of the corresponding support arm and a locating bearing is fixed at the lower end, and each locating bearing is symmetrically distributed with the axis of the screw rod as the center.

[0007] As an improvement of the present utility model, each adjustment slot extends along the axis of the corresponding support arm.

[0008] As a further improvement of the utility model, radially extending jacket ears are symmetrically welded to the outer periphery of the jacket, and the upper end of each connecting rod is hinged to the end of the corresponding jacket ear through a pin.

[0009] As a further improvement of the utility model, a short shaft step is provided on the upper part of the short shaft, and the short shaft step is pressed on the upper end surface of the corresponding adjustment groove, and the inner ring of the locating bearing is pressed on the lower end surface of the corresponding adjustment groove through a gasket.

[0010] Compared with the prior art, the utility model has achieved the following beneficial effects: 1. The same set of centering tooling can meet the centering requirements of drawn tubes with different diameters, which can reduce the number of centering tooling, reduce the time for replacing centering tooling, and improve welding efficiency;

[0011] 2. The drawn tube within a certain diameter range can be used for centering, which can eliminate the centering deviation caused by the inner diameter deviation of the drawn tube. The centering is accurate, the welding trajectory is accurate, and the welding quality is improved;

[0012] 3. It can complete the welding between the numerous holes on the orifice plate and the outer wall of the welded pipe. The positioning ejector provides an accurate axis for the rotation of the welding gun. During the welding process, the welding gun strictly rotates around the center line of the welded pipe to avoid centering errors in the weld.

[0013] 4. Greatly reduce the labor intensity of welders, improve welding efficiency, improve welding quality and make the weld look beautiful. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. The accompanying drawings are only provided for reference and explanation and are not intended to limit the present invention.

[0015] Figure 1 This is a front view of the adjustable centering mechanism for welding the outer weld of the orifice plate drawn tube of the utility model;

[0016] Figure 2 for Figure 1 A top view of

[0017] Figure 3 for Figure 1 The three-dimensional Figure 1 ;

[0018] Figure 4 for Figure 1 The three-dimensional Figure 2 ;

[0019] Figure 5 This is a working state diagram of the utility model;

[0020] In the figure: 1. Coupling; 2. Screw; 3. Adjusting nut; 4. Jacket; 4a. Jacket support ear; 5. Connecting rod; 6. Short shaft; 7. Support; 7a. Adjusting groove; 8. Positioning bearing; 9. Support block; 10. Support wheel; 11. Orifice plate; 12. Pulling tube; 13. Rotating center axis of welding tooling; 14. Welding gun. DETAILED DESCRIPTION

[0021] In the following description of the utility model, the terms "upper", "lower", "front", "back", "left", "right", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the utility model and simplifying the description, and do not mean that the device must have a specific direction.

[0022] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below with reference to specific illustrations.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0024] like Figures 1 to 5 As shown, the utility model of the adjustable centering mechanism for welding the outer weld of the orifice plate pull tube includes a coupling 1, a screw 2, an adjusting nut 3, a jacket 4, a connecting rod 5, a short shaft 6, a support 7, a positioning bearing 8 and a support wheel 10. The support 7 includes three support arms, which are arranged in a regular triangle star shape and the inner ends are connected as a whole. Support blocks 9 are respectively fixed below the outer ends of the three support arms, and support wheels 10 are respectively fixed on each support block 9. The axes of the three support wheels 10 are parallel to the axes of the corresponding support arms and are centrally symmetrically distributed.

[0025] The center of the support 7 is fixedly connected with a screw rod extending upward, the upper end of the screw rod is provided with a coupling 1 and the middle section of the screw rod is screwed with an adjusting nut 3, a jacket 4 is fixed below the adjusting nut 3, three connecting rods 5 are symmetrically hinged on the circumference of the jacket 4, and the lower end of each connecting rod 5 is hinged with a short shaft 6. The middle section of each support arm is provided with a hollow adjustment slot 7a, and each adjustment slot 7a extends along the axis of the corresponding support arm.

[0026] Each short shaft 6 passes through the adjustment slot 7a of the corresponding support arm and a positioning bearing 8 is fixed to the lower end. The positioning bearings 8 are distributed symmetrically with the axis of the screw rod as the center.

[0027] The outer circumference of the jacket 4 is symmetrically welded with jacket lugs 4a extending in the radial direction, and the upper end of each connecting rod 5 is hinged to the end of the corresponding jacket lug 4a through a pin.

[0028] A short shaft step is provided on the upper part of the short shaft 6, and the short shaft step is pressed on the upper end surface of the corresponding adjustment groove 7a. The inner ring of the positioning bearing 8 is pressed on the lower end surface of the corresponding adjustment groove 7a through a gasket to keep the short shaft 6 in a vertical state.

[0029] It is connected to the rotating central axis 13 of the existing welding tooling through the coupling 1, and the supporting wheel 10 is placed on the outer periphery of the pull tube 12 and supported on the orifice plate 11; the adjusting nut 3 is rotated to drive the sleeve 4 to move on the screw rod 2, so that the connecting rod 5 drives the positioning bearing 8 to slide along the adjusting groove 7a on the support 7, and the centering and positioning is completed when the positioning bearing 8 contacts the inner wall of the pull tube 12, and the welding gun 14 points to the weld on the outer periphery of the pull tube; the existing welding tooling drive motor is started, the supporting wheel 10 rolls on the orifice plate 11 on the outer periphery of the pull tube, the positioning bearing 8 rolls along the inner wall of the pull tube 12, the adjustable centering mechanism rotates around the center of the pull tube, and the welding gun 14 completes the welding of the weld on the outer periphery of the pull tube.

[0030] The above description is only the preferred feasible embodiment of the utility model, which shows and describes the basic principle, main features and advantages of the utility model, but does not limit the scope of patent protection of the utility model. The technicians in this industry should understand that the utility model is not limited by the above embodiments. In addition to the above embodiments, the utility model can also have other implementation modes without departing from the spirit and scope of the utility model. The utility model will also have various changes and improvements. All technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the utility model. The scope of protection required by the utility model is defined by the attached claims and their equivalents. The technical features not described in the utility model can be achieved by or using existing technologies, which will not be repeated here.

Claims

1. An adjustable centering mechanism for welding the outer weld of a orifice plate drawn tube, comprising a support, characterized in that: The support comprises three support arms, which are arranged in a regular triangle star shape and the inner ends are connected as a whole, support blocks are respectively fixed below the outer ends of the three support arms, and support wheels are respectively fixed on each support block, and the axes of the three support wheels are parallel to the axes of the corresponding support arms and are centrally symmetrically distributed; The center of the support is fixedly connected with a screw rod extending upward, the upper end of the screw rod is provided with a coupling and the middle section of the screw rod is screwed with an adjusting nut, a jacket is fixed below the adjusting nut, three connecting rods are symmetrically hinged on the circumference of the jacket, and a short shaft is hinged at the lower end of each connecting rod, each short shaft passes through the hollow adjustment groove of the corresponding support arm and a locating bearing is fixed at the lower end, and each locating bearing is symmetrically distributed with the axis of the screw rod as the center.

2. The adjustable centering mechanism for welding the outer weld of the orifice plate drawn tube according to claim 1 is characterized in that: Each adjusting slot extends along the axis of the corresponding supporting arm.

3. The adjustable centering mechanism for welding the outer weld of the orifice plate drawn tube according to claim 1 is characterized in that: The outer periphery of the jacket is symmetrically welded with jacket lugs extending in the radial direction, and the upper end of each connecting rod is hinged to the end of the corresponding jacket lug through a pin shaft.

4. The adjustable centering mechanism for welding the outer weld of the orifice plate drawn tube according to claim 1, 2 or 3, characterized in that: A short shaft step is provided on the upper part of the short shaft, and the short shaft step is pressed on the upper end surface of the corresponding adjustment groove, and the inner ring of the locating bearing is pressed on the lower end surface of the corresponding adjustment groove through a gasket.

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