Movable preheating device before girth welding

Abstract

The utility model discloses a movable type circular seam pre-welding preheating device which comprises a base, trundles, a lifting frame, a driving unit, a lifting platform, a supporting seat, an arc-shaped heat insulation plate and a heating belt, the trundles are arranged at all corners of the base respectively, the bottom of the lifting frame is hinged to the base, the lifting platform is hinged to the top of the lifting frame, and the arc-shaped heat insulation plate is arranged on the supporting seat. A first transverse rod is arranged at the bottom of the lifting frame, a second transverse rod is arranged at the upper middle position of the lifting frame, the two ends of the driving unit are hinged to the first transverse rod and the second transverse rod respectively, the supporting seat is arranged at the top of the lifting platform, the arc-shaped heat insulation plate is hinged to the supporting seat, and the heating belt is arranged on the inner wall of the arc-shaped heat insulation plate. According to the preheating device, the heating belt is adopted to carry out flameless heating on the circular seam of the workpiece, so that the potential safety hazard existing in flame heating is avoided, the production environment of operators is improved, and the practicability of the preheating device is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of welding preheating, in particular to a mobile preheating device before girth welding. Background Art

[0002] When welding the circumferential seams of large cylindrical workpieces such as boilers and metal pipes, in order to improve the welding quality and performance, the circumferential seams need to be preheated before welding to reduce the temperature difference between the weld metal and the base material, reduce stress concentration, and prevent cracks.

[0003] At present, flame heating is widely used in the industry to preheat the workpiece, such as the preheating device for pipeline girth welding disclosed in patent CN215846210U. When the pipeline needs to be preheated, first loosen the nut to open the locking device, and open the two gas pipes. After the pressure pipeline is placed between the supporting wheel frames, close the gas pipes and tighten the locking device, and then align the flame nozzle with the position to be preheated. At this time, the supporting wheel frame allows the entire preheating device to slide around the pipeline, and the installation is completed; then inject combustible gas into the intake pipe, the combustible gas fills the intake pipe and is ejected from the flame nozzle, and then the entire device is rotated back and forth in a small range at a uniform speed to make the weld evenly heated.

[0004] However, the above-mentioned preheating device has at least the following three problems:

[0005] 1. The preparation work before preheating is relatively cumbersome, and the preheating device needs to be assembled and positioned, which takes a certain amount of time, so the use efficiency is low;

[0006] Second, the flame heating method is not safe and environmentally friendly. The factory needs to obtain approval and procedures for hazardous chemical qualifications when using flammable gases, and take corresponding anti-static and fire-fighting measures on site. However, even if relevant measures are taken, there is still a risk of leakage or explosion;

[0007] 3. During the preheating process, gas combustion will release a large amount of heat. Operators are working at high temperatures and the working environment is relatively harsh.

[0008] In summary, it is necessary to improve the existing annular seam preheating device to solve the above problems. Utility Model Content

[0009] To achieve the above-mentioned purpose, the utility model discloses a mobile preheating device before circumferential seam welding, including a base, casters, a lifting frame, a driving unit, a lifting platform, a supporting seat, a curved heat insulation board and a heating belt, wherein each corner of the base is provided with a caster, the bottom of the lifting frame is hinged on the base, the lifting platform is hinged on the top of the lifting frame, a first cross bar is provided at the bottom of the lifting frame, a second cross bar is provided at the middle upper position of the lifting frame, the two ends of the driving unit are respectively hinged to the first cross bar and the second cross bar, the supporting seat is arranged on the top of the lifting platform, the curved heat insulation board is hinged on the supporting seat, and the heating belt is arranged on the inner wall of the curved heat insulation board.

[0010] Furthermore, a first connecting block is fixedly provided on the first cross bar, a first connecting seat is provided at the bottom of the driving unit, and the first connecting seat is rotatably connected to the first connecting block via a first pin shaft.

[0011] Furthermore, a second connecting block is fixedly provided on the second cross bar, a second connecting seat is provided on the top of the driving unit, and the second connecting seat is rotatably connected to the second connecting block via a second pin shaft.

[0012] Furthermore, slide grooves are provided on both left and right sides of the base, and both ends of the first cross bar are slidably arranged in the slide grooves through sliding members.

[0013] Furthermore, a third connecting seat is provided on the front side of the base, and the bottom of the lifting frame is rotatably connected to the third connecting seat via a third pin shaft.

[0014] Furthermore, a third cross bar is provided inside the support seat, and a rotating sleeve is provided on the back of the arc-shaped heat insulation board, and the rotating sleeve can be rotatably sleeved on the outside of the third cross bar.

[0015] Furthermore, an armrest is provided on one side of the base.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] 1. The entire device can be freely moved through the base and casters, and it is highly flexible to use;

[0018] Second, the lifting frame and the lifting platform are driven by the driving unit to move up and down, and the height of the arc-shaped heat insulation board and the heating belt can be adjusted to adapt to cylindrical workpieces of different sizes;

[0019] 3. The use of a heating belt to heat the annular seam of the workpiece without flame not only eliminates the potential safety hazards of flame heating, but also improves the production environment of the operator, thereby improving the practicality of the preheating device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0022] Figure 2 It is a schematic diagram of the bottom partial structure of the utility model;

[0023] Figure 3 This is a schematic diagram of the connection between the support seat and the arc-shaped heat insulation board in the utility model;

[0024] Figure 4 This is a usage state diagram of the utility model.

[0025] Reference numerals:

[0026] 1-base, 2-castor, 3-armrest, 4-lifting frame, 5-drive unit, 6-lifting platform, 7-support seat, 8-arc-shaped heat insulation board, 9-heating belt, 10-first cross bar, 11-second cross bar, 12-first connecting block, 13-first connecting seat, 14-first pin shaft, 15-second connecting block, 16-second connecting seat, 17-second pin shaft, 18-slide groove, 19-sliding part, 20-third connecting seat, 21-third pin shaft, 22-third cross bar, 23-swivel sleeve, 24-power cord, 25-induction heating equipment. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0028] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0029] In addition, the descriptions of "first", "second", etc. in the present invention are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0030] In the description of the embodiments, unless otherwise clearly specified and limited, the terms "disposed", "connected" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or it can be connected through an intermediate medium, or it can be a communication between two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0031] like Figure 1 As shown, the mobile preheating device before circumferential seam welding in this embodiment includes a base 1, casters 2, handrails 3, a lifting frame 4, a drive unit 5, a lifting platform 6, a support seat 7, a curved heat insulation board 8 and a heating belt 9.

[0032] A caster 2 is provided at each corner of the base 1. The caster 2 can adopt a self-locking universal wheel to facilitate the movement and locking of the base 1; an armrest 3 is arranged on one side of the base 1 to facilitate the movement of the entire pushing device, and the convenience and flexibility of use are high.

[0033] The bottom of the lifting frame 4 is hinged on the base 1, and the lifting platform 6 is hinged on the top of the lifting frame 4; wherein, the lifting frame 4 can adopt the scissor-type lifting structure commonly used in the art, which has the advantages of stable structure, low failure rate, reliable operation, simple and convenient maintenance, etc.

[0034] A first cross bar 10 is provided at the bottom of the lifting frame 4, a second cross bar 11 is provided at the middle upper position of the lifting frame 4, and both ends of the driving unit 5 are hinged to the first cross bar 10 and the second cross bar 11 respectively; wherein, the driving unit 5 can adopt a linear driving method commonly used in the field, such as a cylinder, an oil cylinder, and an electric push rod.

[0035] A first connecting block 12 is fixedly provided on the first cross bar 10, a first connecting seat 13 is provided at the bottom of the driving unit 5, and the first connecting seat 13 is rotatably connected to the first connecting block 12 via a first pin shaft 14; a second connecting block 15 is fixedly provided on the second cross bar 11, a second connecting seat 16 is provided at the top of the driving unit 5, and the second connecting seat 16 is rotatably connected to the second connecting block 15 via a second pin shaft 17.

[0036] The reciprocating motion of the driving unit 5 can drive the lifting frame 4 to extend and retract, thereby realizing the lifting and lowering of the lifting platform 6 .

[0037] The support seat 7 is arranged on the top of the lifting platform 6, the arc-shaped heat insulation plate 8 is hinged on the support seat 7, and the heating belt 9 is arranged on the inner wall of the arc-shaped heat insulation plate 8; wherein, the arc-shaped heat insulation plate 8 can adopt a fluororubber plate, which has the advantages of insulation, heat insulation, and good elasticity, and can withstand a high temperature of 300°C, while the preheating temperature of conventional metal materials before welding is generally 100-120°C, and the maximum does not exceed 200°C, so it can meet the use requirements; another advantage of using a fluororubber plate is that it can undergo elastic deformation itself and can adapt to cylindrical workpieces of different sizes.

[0038] like Figure 2 As shown, both sides of the base 1 are provided with slide grooves 18, and the two ends of the first cross bar 10 are slidably set in the slide grooves 18 through sliding members 19 respectively; a third connecting seat 20 is provided on the front side of the base 1, and the bottom of the lifting frame 4 is rotatably connected to the third connecting seat 20 through a third pin shaft 21; during the extension and retraction process of the lifting frame 4, the two ends of the first cross bar 10 can reciprocate along the slide groove 18; wherein the sliding member 19 can adopt a bearing, a slider and other structures.

[0039] The lifting frame 4 and the bottom of the lifting platform 6 are also connected in the same manner, which will not be described in detail here.

[0040] like Figure 3 As shown, a third cross bar 22 is provided inside the support seat 7, and a rotating sleeve 23 is provided on the back of the arc-shaped heat insulation plate 8. The rotating sleeve 23 can be rotatably mounted on the outside of the third cross bar 22. The arc-shaped heat insulation plate 8 can rotate freely and flexibly around the third cross bar 22 so as to fit with different positions of the outer wall of the cylindrical workpiece.

[0041] like Figure 4 As shown, when in use, the device is placed close to the annular seam of the cylindrical workpiece to be heated, and the cylindrical workpiece can be driven by a roller frame to perform intermittent rotation. When heating, the arc-shaped heat insulation plate 8 and the heating belt 9 are close to the outer wall of the annular seam, and the workpiece is separated when rotating. The heating belt 9 is connected to the induction heating device 25 through a power cord 24, and the heating temperature and heating time of the heating belt 9 are controlled by the induction heating device 25, wherein the induction heating device 25 can adopt a PWHT700 series digital intelligent induction heating device.

[0042] The utility model drives the lifting frame 4 and the lifting platform 6 to lift and lower through the driving unit 5, and the height of the arc-shaped heat insulation plate 8 and the heating belt 9 can be adjusted to adapt to cylindrical workpieces of different sizes; the heating belt 9 is used to heat the annular seam of the workpiece without flame, which not only eliminates the safety hazards of flame heating, but also improves the production environment of the operators, thereby improving the practicability of the preheating device.

[0043] The above is only a preferred embodiment of the utility model, and is not intended to limit the utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement; when the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the utility model.

Claims

1. A mobile preheating device for girth welding, characterized in that: It includes a base, casters, a lifting frame, a driving unit, a lifting platform, a supporting seat, a curved heat insulation board and a heating belt. A caster is provided at each corner of the base. The bottom of the lifting frame is hinged to the base, the lifting platform is hinged to the top of the lifting frame, a first cross bar is provided at the bottom of the lifting frame, and a second cross bar is provided at the middle upper position of the lifting frame. Both ends of the driving unit are hinged to the first cross bar and the second cross bar respectively. The supporting seat is arranged on the top of the lifting platform, the curved heat insulation board is hinged to the supporting seat, and the heating belt is arranged on the inner wall of the curved heat insulation board.

2. The mobile preheating device before girth welding according to claim 1 is characterized in that: A first connecting block is fixedly provided on the first crossbar, a first connecting seat is provided at the bottom of the driving unit, and the first connecting seat is rotatably connected to the first connecting block via a first pin shaft.

3. The mobile preheating device before girth welding according to claim 2 is characterized in that: A second connecting block is fixedly provided on the second cross bar, a second connecting seat is provided on the top of the driving unit, and the second connecting seat is rotatably connected to the second connecting block via a second pin shaft.

4. The mobile preheating device before girth welding according to claim 1 is characterized in that: Slide grooves are arranged on both left and right sides of the base, and two ends of the first cross bar are slidably arranged in the slide grooves through sliding pieces.

5. The mobile preheating device before girth welding according to claim 4 is characterized in that: A third connecting seat is provided on the front side of the base, and the bottom of the lifting frame is rotatably connected to the third connecting seat via a third pin shaft.

6. The mobile preheating device before girth welding according to claim 1 is characterized in that: A third cross bar is arranged inside the support seat, and a rotating sleeve is arranged at the back of the arc-shaped heat insulation board. The rotating sleeve is rotatably sleeved on the outside of the third cross bar.

7. The mobile preheating device before girth welding according to claim 1 is characterized in that: An armrest is also provided on one side of the base.

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