Adjustable welding preheating device

Abstract

The utility model discloses an adjustable welding preheating device which solves the technical problem that in the prior art, when a welding gun is held by hand to preheat a long welding seam or a special-shaped welding seam, the preheating requirement is difficult to meet due to the fact that heat dissipation of a component is fast. The welding seam preheating device comprises a support, a connecting mechanism arranged on the support and used for being fixed to a component to be preheated, and a heating pipe arranged on the support, matched with a welding seam on the component to be preheated and used for preheating the welding seam. And a height adjusting mechanism is arranged between the bracket and the heating pipe. The welding seam preheating device is simple in structure, scientific and reasonable in design, capable of conveniently preheating a long welding seam or a welding seam of a special-shaped component before welding, and capable of meeting the welding seam preheating requirement.

Description

Technical Field

[0001] This utility model belongs to the field of steel structure welding technology, specifically relating to an adjustable welding preheating device. Background Technology

[0002] In the production of steel structures, thick plates and high-strength steel components are often encountered. Before welding, preheating is required according to the process requirements. The conventional practice is to use a heat gun to heat the bevel. However, when welding large thick steel plate structures, welding conditions with long welds, and various irregular steel structures, the heat dissipation of these components is relatively fast, and the heat gun is difficult to meet the preheating requirements before welding. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide an adjustable welding preheating device to at least solve some of the above-mentioned technical problems.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] An adjustable welding preheating device includes a support, a connecting mechanism mounted on the support for fixing to a component to be preheated, and a heating tube mounted on the support and adapted to the weld on the component to be preheated for preheating the weld; a height adjustment mechanism is provided between the support and the heating tube.

[0006] Furthermore, the heating tube has several gas outlets evenly distributed along its axial direction. One end of the heating tube is connected to a natural gas hose for filling the heating tube with natural gas, and the other end is provided with a plug.

[0007] Furthermore, a fixed support is provided at one end of the heating tube, and a nozzle with one end inserted into the center of the heating tube and the other end connected to the natural gas hose is installed on the fixed support.

[0008] Furthermore, the fixed support includes a support plate and a supporting steel strip welded between the support plate and the heating pipe; the nozzle includes a nozzle tube, one end of which is provided with a gas outlet converging pipe and the other end is provided with a connecting pipe connected to a natural gas hose, and the nozzle tube is provided with a flow valve for controlling the gas flow rate inside it; the outer wall of the nozzle tube is provided with external threads, and the support plate has a threaded hole in the center that is compatible with the nozzle tube, the threaded hole in the center of the support plate is coaxially distributed with the heating pipe, and the nozzle tube is threadedly connected to the threaded hole in the center of the support plate.

[0009] Furthermore, two air outlets constitute a group of air outlets, and several groups of such air outlets are evenly distributed along the axial direction of the heating tube.

[0010] Furthermore, the distance between adjacent air outlet groups is 100mm, the diameter of the air outlet is 3mm, and the distance between two air outlets in the same air outlet group is 2mm.

[0011] Furthermore, there are at least two height adjustment mechanisms, each including a sleeve located on one side of the bracket and a slide rod passing through the sleeve and connected to the heating tube; the sleeve is provided with a handwheel for abutting and locking the slide rod.

[0012] Furthermore, the handwheel includes a handle and a locking screw on the handle; the sleeve has a threaded hole adapted to the locking screw, the locking screw is threaded into the threaded hole and its end extends into the sleeve and abuts against the top of the slide rod.

[0013] Furthermore, the connecting mechanism includes an H-shaped slide rail located on the other side of the bracket, and an electromagnetic chuck slidably mounted on the H-shaped slide rail for adsorbing and fixing onto the component to be preheated.

[0014] Furthermore, the H-shaped slide rail is equipped with a C-shaped slider that can slide along its length. The C-shaped slider is provided with a connecting rod, and the electromagnetic chuck is installed on the connecting rod.

[0015] There are at least two electromagnetic chucks, with adjacent electromagnetic chucks spaced 30-80cm apart.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] This utility model has a simple structure and a scientific and reasonable design, which can conveniently preheat long welds or welds of irregularly shaped components before welding, and can meet the above-mentioned weld preheating requirements. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model.

[0019] Figure 2 This is a schematic diagram showing the connection between the natural gas hose, the fixed support, and the heating pipe of this utility model.

[0020] Figure 3 This is a schematic diagram of the fixed support structure of this utility model.

[0021] Figure 4 This is a schematic diagram of the nozzle structure of this utility model.

[0022] Figure 5 This is a schematic diagram of the threaded hole on the sleeve of this utility model.

[0023] Figure 6 This is a schematic diagram of the handwheel of this utility model.

[0024] Figure 7 This is a schematic diagram of the C-shaped slider, connecting rod, and electromagnetic chuck of this utility model.

[0025] Figure 8 for Figure 7 The left view.

[0026] The names corresponding to the reference numerals in the attached figures are as follows:

[0027] 1-Bracket, 2-Heating tube, 3-H-shaped slide rail, 4-Electromagnetic chuck, 5-C-shaped slider, 6-Connecting rod, 7-Sleeve, 8-Slide rod, 9-Handwheel, 10-Handle, 11-Threaded hole, 12-Fixed support, 13-Plug, 14-Gas outlet, 15-Natural gas hose, 16-Nozzle, 17-Support plate, 18-Supporting steel bar, 19-Nozzle tube, 20-Gas outlet converging tube, 21-Connecting tube, 22-Flow valve, 23-Locking screw. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0029] Example 1.

[0030] like Figures 1-8 As shown, the present invention provides an adjustable welding preheating device, including a support 1, a connecting mechanism disposed on the support 1 for fixing to the component to be preheated, and a heating tube 2 disposed on the support 1 and adapted to the weld on the component to be preheated for preheating the weld; a height adjustment mechanism is provided between the support 1 and the heating tube 2.

[0031] This utility model has a simple structure and a scientific and reasonable design, which can conveniently preheat long welds or welds of irregularly shaped components before welding, and can meet the above-mentioned weld preheating requirements.

[0032] Example 2.

[0033] like Figures 1-8 As shown, the present invention provides an adjustable welding preheating device, including a support 1, a connecting mechanism disposed on the support 1 for fixing to the component to be preheated, and a heating tube 2 disposed on the support 1 and adapted to the weld on the component to be preheated for preheating the weld; a height adjustment mechanism is provided between the support 1 and the heating tube 2.

[0034] The heating tube 2 has several gas outlets 14 evenly arranged along its axial direction. One end of the heating tube 2 is connected to a natural gas hose 15 for filling the heating tube 2 with natural gas, and the other end is provided with a plug 13.

[0035] Based on Embodiment 1, this embodiment 2 provides a more preferred structure for the heating tube 2. Specifically, the heating tube 2 has several gas outlets 14 evenly distributed along its axial direction. One end of the heating tube 2 is connected to a natural gas hose 15 for filling the heating tube 2 with natural gas, and the other end is provided with a plug 13. Natural gas is filled into the heating tube 2 through the natural gas hose 15 and then ignited at the gas outlets 14, thus forming a heating flame in the shape of the line connecting the gas outlets 14 on the heating tube 2 to preheat the component. The heating tube of this utility model can be made into a straight rod, arc, circle, or other complex shape according to the actual shape of the component, so as to achieve the matching of the shape of the line connecting the gas outlets 14 with the weld seam, thereby meeting the preheating requirements of the weld seams of different components.

[0036] Example 3.

[0037] like Figures 1-8 As shown, the present invention provides an adjustable welding preheating device, including a support 1, a connecting mechanism disposed on the support 1 for fixing to the component to be preheated, and a heating tube 2 disposed on the support 1 and adapted to the weld on the component to be preheated for preheating the weld; a height adjustment mechanism is provided between the support 1 and the heating tube 2.

[0038] The heating tube 2 has several gas outlets 14 evenly arranged along its axial direction. One end of the heating tube 2 is connected to a natural gas hose 15 for filling the heating tube 2 with natural gas, and the other end is provided with a plug 13.

[0039] The heating tube 2 is provided with a fixed support 12 at one end, and a nozzle 16 is installed on the fixed support 12, with one end inserted into the center of the heating tube 2 and the other end connected to the natural gas hose 15.

[0040] Based on Example 2, this embodiment 3 provides a more preferred structure for the heating tube 2. Specifically, one end of the heating tube 2 is provided with a fixed support 12, and a nozzle 16 is installed on the fixed support 12, with one end inserted into the center of the heating tube 2 and the other end connected to the natural gas hose 15. By extending the nozzle 16 into the middle of the natural gas flow channel inside the heating tube 2, the natural gas in the outlet 14 of the heating tube 2 can be controlled to be sprayed out in an orderly and uniform manner, ensuring the uniformity of the preheating flame on the heating tube 2 during preheating.

[0041] Example 4.

[0042] like Figures 1-8 As shown, the present invention provides an adjustable welding preheating device, including a support 1, a connecting mechanism disposed on the support 1 for fixing to the component to be preheated, and a heating tube 2 disposed on the support 1 and adapted to the weld on the component to be preheated for preheating the weld; a height adjustment mechanism is provided between the support 1 and the heating tube 2.

[0043] The heating tube 2 has several gas outlets 14 evenly arranged along its axial direction. One end of the heating tube 2 is connected to a natural gas hose 15 for filling the heating tube 2 with natural gas, and the other end is provided with a plug 13.

[0044] The heating tube 2 is provided with a fixed support 12 at one end, and a nozzle 16 is installed on the fixed support 12, with one end inserted into the center of the heating tube 2 and the other end connected to the natural gas hose 15.

[0045] The fixed support 12 includes a support plate 17 and a support steel strip 18 welded between the support plate 17 and the heating pipe 2;

[0046] The nozzle 16 includes a nozzle tube 19, one end of which is provided with a gas outlet converging tube 20 and the other end is provided with a connecting tube 21 connected to a natural gas hose 15. The nozzle tube 19 is provided with a flow valve 22 for controlling the gas flow rate inside it.

[0047] The nozzle tube 19 has an external thread on its outer wall, and the support plate 17 has a threaded hole in the center that matches the nozzle tube 19. The threaded hole in the center of the support plate 17 is coaxial with the heating tube 2, and the nozzle tube 19 is threaded into the threaded hole in the center of the support plate 17.

[0048] Based on Embodiment 3, Embodiment 4 provides a more preferred structure for the fixed support 12 and the nozzle 16. Specifically, the fixed support 12 includes a support plate 17 and a supporting steel strip 18 welded between the support plate 17 and the heating pipe 2. The nozzle 16 includes a nozzle tube 19, one end of which is provided with a gas outlet converging pipe 20, and the other end is provided with a connecting pipe 21 connected to a natural gas hose 15. The nozzle tube 19 is provided with a flow valve 22 for controlling the gas flow rate inside it. The outer wall of the nozzle tube 19 is provided with external threads. The support plate 17 has a threaded hole in the center that matches the nozzle tube 19. The threaded hole in the center of the support plate 17 is coaxially distributed with the heating pipe 2, and the nozzle tube 19 is threadedly connected to the threaded hole in the center of the support plate 17.

[0049] The fixed support 12 consists of a round steel plate (support plate 17) with a central threaded hole and three supporting steel bars 18. One end of the three supporting steel bars 18 is welded to the circumference of the round steel plate (support plate 17), and the three supporting steel bars 18 are evenly distributed on the round steel plate (support plate 17) circumferentially. The other end of the three supporting steel bars 18 is welded to the end of the heating tube 2. Its function is to fix the round steel plate (support plate 17) to the heating tube 2. The round steel plate (support plate 17) and the heating tube 2 are 50mm apart and concentric.

[0050] Nozzle 16 is a round tube with external threads (nozzle tube 19). One end is a gas outlet connected to a gas outlet reducer 20, which increases the pressure of the natural gas injection. The other end is a gas pipe interface connected to a connecting pipe 21 for easy connection and fixation to the natural gas hose 15. This connection is a conventional connection, and the two are sealed and fixed by clamps or wire ties. Nozzle tube 19 is equipped with a flow valve 22 to adjust the natural gas flow rate.

[0051] The nozzle tube 19 is threaded into the center threaded hole of the support plate 17 of the fixed support 12, and the gas outlet converging tube 20 extends into the port of the heating tube 2. During operation, the natural gas hose 15 is fixed to the connecting pipe 21, the flow valve 22 is opened slightly, and natural gas is ignited at the outlet of the heating tube 2. The pressure of the natural gas injected into the heating tube 2 is adjusted by the flow valve 22. At this time, a negative pressure is formed at the port of the heating tube 2, simultaneously drawing air into the heating tube 2. After mixing, the air is ejected from the outlet of the heating tube 2 for combustion. The opening of the flow valve 22 controls the natural gas pressure and simultaneously adjusts the flame length.

[0052] Example 5.

[0053] like Figures 1-8 As shown, the present invention provides an adjustable welding preheating device, including a support 1, a connecting mechanism disposed on the support 1 for fixing to the component to be preheated, and a heating tube 2 disposed on the support 1 and adapted to the weld on the component to be preheated for preheating the weld; a height adjustment mechanism is provided between the support 1 and the heating tube 2.

[0054] The heating tube 2 has several gas outlets 14 evenly arranged along its axial direction. One end of the heating tube 2 is connected to a natural gas hose 15 for filling the heating tube 2 with natural gas, and the other end is provided with a plug 13.

[0055] Two air outlets 14 form a group of air outlets, and several groups of air outlets are evenly distributed along the axis of the heating tube 2.

[0056] Based on Example 2, this embodiment 5 provides a more preferred structure for the heating tube 2, specifically: two air outlets 14 form a group of air outlets, and several groups of such air outlets are evenly distributed along the axial direction of the heating tube 2. Having two air outlets as a group allows for more effective preheating of the weld.

[0057] Example 6.

[0058] like Figures 1-8 As shown, the present invention provides an adjustable welding preheating device, including a support 1, a connecting mechanism disposed on the support 1 for fixing to the component to be preheated, and a heating tube 2 disposed on the support 1 and adapted to the weld on the component to be preheated for preheating the weld; a height adjustment mechanism is provided between the support 1 and the heating tube 2.

[0059] The heating tube 2 has several gas outlets 14 evenly arranged along its axial direction. One end of the heating tube 2 is connected to a natural gas hose 15 for filling the heating tube 2 with natural gas, and the other end is provided with a plug 13.

[0060] Two air outlets 14 form a group of air outlets, and several groups of air outlets are evenly distributed along the axis of the heating tube 2.

[0061] The distance between adjacent air outlet groups is 100mm, the diameter of air outlet 14 is 3mm, and the distance between two air outlets 14 in the same air outlet group is 2mm.

[0062] Based on Example 5, this embodiment 6 provides a more preferred structure for the heating tube 2, specifically: the distance between adjacent gas outlet groups is 100mm, the diameter of the gas outlet 14 is 3mm, and the distance between two gas outlets 14 in the same group is 2mm. This design ensures that the weld meets the preheating requirements while preventing excessive preheating that could lead to natural gas loss.

[0063] Example 7.

[0064] like Figures 1-8 As shown, the present invention provides an adjustable welding preheating device, including a support 1, a connecting mechanism disposed on the support 1 for fixing to the component to be preheated, and a heating tube 2 disposed on the support 1 and adapted to the weld on the component to be preheated for preheating the weld; a height adjustment mechanism is provided between the support 1 and the heating tube 2.

[0065] There are at least two height adjustment mechanisms. The height adjustment mechanism includes a sleeve 7 located on one side of the bracket 1, and a slide rod 8 passing through the sleeve 7 and connected to the heating tube 2. The sleeve 7 is provided with a handwheel 9 for pressing and locking the slide rod 8.

[0066] Based on Embodiment 1, Embodiment 7 provides a more preferred structure for the height adjustment mechanism. Specifically, there are at least two height adjustment mechanisms, each including a sleeve 7 located on one side of the support 1 and a sliding rod 8 passing through the sleeve 7 and connected to the heating tube 2. The sleeve 7 is equipped with a handwheel 9 for abutting and locking the sliding rod 8. By loosening the handwheel 9, the sliding rod 8 can move freely within the sleeve 7 to adjust its upward extension length, thereby adjusting the height of the heating tube 2. After adjusting to a suitable position, tightening the handwheel 9 will fix the sliding rod 8 within the sleeve 7.

[0067] Example 8.

[0068] like Figures 1-8As shown, the present invention provides an adjustable welding preheating device, including a support 1, a connecting mechanism disposed on the support 1 for fixing to the component to be preheated, and a heating tube 2 disposed on the support 1 and adapted to the weld on the component to be preheated for preheating the weld; a height adjustment mechanism is provided between the support 1 and the heating tube 2.

[0069] There are at least two height adjustment mechanisms. The height adjustment mechanism includes a sleeve 7 located on one side of the bracket 1, and a slide rod 8 passing through the sleeve 7 and connected to the heating tube 2. The sleeve 7 is provided with a handwheel 9 for pressing and locking the slide rod 8.

[0070] The handwheel 9 includes a handle 10 and a locking screw 23 on the handle 10; the sleeve 7 has a threaded hole 11 that is adapted to the locking screw 23, the locking screw 23 is threaded into the threaded hole 11 and its end extends into the sleeve 7 and abuts against the top of the slide bar 8.

[0071] Based on Embodiment 7, this embodiment 8 provides a more preferred structure for the handwheel 9. Specifically, the handwheel 9 includes a handle 10 and a locking screw 23 disposed on the handle 10. A threaded hole 11 adapted to the locking screw 23 is provided on the sleeve 7. The locking screw 23 is threaded into the threaded hole 11, and its end extends into the sleeve 7 and abuts against the sliding rod 8. Rotating the handle 10 allows the end of the locking screw 23 extending into the sleeve 7 to abut against the sliding rod 8 and lock it in place against the inner wall of the sleeve 7. Alternatively, rotating the handle 10 releases the locking screw 23, allowing it to move freely up and down within the sleeve 7 for easy adjustment.

[0072] Example 9.

[0073] like Figures 1-8 As shown, the present invention provides an adjustable welding preheating device, including a support 1, a connecting mechanism disposed on the support 1 for fixing to the component to be preheated, and a heating tube 2 disposed on the support 1 and adapted to the weld on the component to be preheated for preheating the weld; a height adjustment mechanism is provided between the support 1 and the heating tube 2.

[0074] The connecting mechanism includes an H-shaped slide rail 3 located on the other side of the bracket 1, and an electromagnetic chuck 4 slidably mounted on the H-shaped slide rail 3 for adsorbing and fixing onto the component to be preheated.

[0075] Based on Embodiment 1, Embodiment 9 provides a more preferred structure for the connecting mechanism. Specifically, the connecting mechanism includes an H-shaped slide rail 3 located on the other side of the support 1, and an electromagnetic chuck 4 slidably mounted on the H-shaped slide rail 3 for adsorbing and fixing onto the component to be preheated. By adsorbing and fixing the electromagnetic chuck 4 onto the component to be preheated, the entire invention can be installed onto the component. By adjusting the position of the electromagnetic chuck 4 on the H-shaped slide rail 3, the invention can be better adapted to the component to be preheated, facilitating adsorption and fixing. Furthermore, the position of the heating tube and the weld can be adjusted so that the heating tube is directly below the weld, thus facilitating and effectively preheating the weld. The shape of the H-shaped slide rail 3 can be made into a straight rod shape, an arc shape, a circle, or other complex shapes according to the actual shape of the component, thereby enabling the electromagnetic chuck 4 to be easily adsorbed and fixed onto the component.

[0076] Example 10.

[0077] like Figures 1-8 As shown, the present invention provides an adjustable welding preheating device, including a support 1, a connecting mechanism disposed on the support 1 for fixing to the component to be preheated, and a heating tube 2 disposed on the support 1 and adapted to the weld on the component to be preheated for preheating the weld; a height adjustment mechanism is provided between the support 1 and the heating tube 2.

[0078] The connecting mechanism includes an H-shaped slide rail 3 located on the other side of the bracket 1, and an electromagnetic chuck 4 slidably mounted on the H-shaped slide rail 3 for adsorbing and fixing onto the component to be preheated.

[0079] The H-shaped slide rail 3 is equipped with a C-shaped slider 5 that can slide along its length. The C-shaped slider 5 is provided with a connecting rod 6, and the electromagnetic chuck 4 is installed on the connecting rod 6.

[0080] There are at least two electromagnetic chucks 4, and adjacent electromagnetic chucks 4 are distributed at intervals of 30-80cm.

[0081] Based on Example 9, Embodiment 10 provides a more preferred connection structure between the H-shaped slide rail 3 and the electromagnetic chuck 4. Specifically, the H-shaped slide rail 3 is equipped with a C-shaped slider 5 that can slide along its length. The C-shaped slider 5 has a connecting rod 6, and the electromagnetic chuck 4 is mounted on the connecting rod 6. There are at least two electromagnetic chucks 4, spaced 30-80cm apart. The C-shaped slider 5 is fitted onto one side wing plate of the H-shaped slide rail 3 and can slide freely on the wing plate. When it reaches a suitable position, the C-shaped slider 5 is fixed to the wing plate by tightening the bolts threaded onto it. Figure 8As shown, the bolt is threaded into the threaded hole in the center of the C-shaped slider 5. There are at least two electromagnetic chucks 4, spaced 30-80cm apart. This design ensures a more stable overall structure when assembled onto the component to be preheated, guaranteeing smooth and safe preheating.

[0082] This utility model includes a bracket, a connecting mechanism, and a heating tube. The connecting mechanism includes an H-shaped slide rail, an electromagnetic chuck, a C-shaped slider, and a connecting rod. Adjusting the position of the C-shaped slider on the H-shaped slide rail adjusts the position of the electromagnetic chuck, which is then attached to the component to be welded. At this point, the heating tube is directly below the weld seam to be preheated. A height adjustment mechanism is provided between the bracket and the heating tube. This mechanism includes a sleeve, a sliding rod, and a handwheel. Loosening the handwheel adjusts the height of the sliding rod to adjust the height of the heating tube. Once the position is correct, tightening the handwheel secures the sliding rod. Adjusting the nozzle insertion depth into the heating tube on the fixed support ensures a suitable natural gas flow rate. Then, opening the natural gas valve on the natural gas hose and igniting the heating tube at the outlet closest to the plug at the other end of the tube using an igniter. After ignition, all outlets on the heating tube will be automatically ignited sequentially. Adjusting the height of the heating tube again using the handwheel, based on the flame height, maintains a suitable distance between the flame and the weld seam for optimal preheating.

[0083] This utility model provides an adjustable welding preheating device. One end of the main frame (support 1) is connected to an H-shaped slide rail 3, on which a C-shaped slider 5 slides along the H-shaped slide rail 3. A connecting rod 6 is fixed above the C-shaped slider 5, and the upper end of the connecting rod 6 is connected to an electromagnetic chuck 4. A guide sleeve (sleeve 7) is fixed to the other end of the main frame. A sliding rod 8 is provided inside the guide sleeve. A handwheel 9 is threaded onto the guide sleeve. By adjusting the handwheel, the sliding rod can slide up and down or be fixed along the guide sleeve. The upper end of the sliding rod is fixed to a heating tube 2. One end of the heating tube is connected to a fixed support 12, and the other end is sealed with a plug 13. A nozzle 16 is installed on the fixed support. One end of the nozzle is inserted into the center of the heating tube 2, and the other end is connected to a natural gas hose 15. Two 3mm diameter gas outlets are drilled on the heating tube 2 at 100mm intervals.

[0084] The working process of this adjustable welding preheating device is as follows: Before operation, adjust the spacing between the C-shaped sliders 5 according to the size of the component to be preheated and the length of the weld. Use the electromagnetic chuck 4 to attach the entire device to the bottom of the component. When the electromagnetic chuck 4 is locked, the heating tube 2 is directly below the weld. Turn the handwheel 9 to adjust the height of the heating tube 2 to maintain a suitable distance from the weld, usually 50-100mm. Adjust the depth of the nozzle 16 inserted into the heating tube 2 on the fixed support 12 to meet the appropriate air volume. After the above preparations are completed, open the natural gas valve on the natural gas hose 15. Use an igniter to ignite the heating tube 2 at the end, near the gas outlet on the side of the plug 13. After ignition, all gas outlets on the heating tube 2 will be automatically ignited in sequence. Adjust the height of the heating tube 2 again by turning the handwheel 9 according to the height of the flame to maintain a suitable distance between the flame and the weld to achieve the best preheating state.

[0085] Finally, it should be noted that the above embodiments are merely preferred embodiments used to illustrate the technical solution of this utility model, and are not intended to limit it, much less limit the patent scope of this utility model. Any modifications or refinements made to the main design concept and spirit of this utility model that are not of substantial significance, but which still solve the same technical problem as this utility model, should be included within the protection scope of this utility model; in addition, the direct or indirect application of the technical solution of this utility model to other related technical fields are similarly included within the patent protection scope of this utility model.

Claims

1. An adjustable welding preheat device, characterized by, It includes a bracket (1), a connecting mechanism disposed on the bracket (1) for fixing to the component to be preheated, and a heating pipe (2) disposed on the bracket (1) and adapted to the weld on the component to be preheated for preheating the weld; a height adjustment mechanism is provided between the bracket (1) and the heating pipe (2).

2. An adjustable welding preheating device according to claim 1, wherein The heating tube (2) has several gas outlets (14) evenly arranged along its axial direction. One end of the heating tube (2) is connected to a natural gas hose (15) for filling the heating tube (2) with natural gas, and the other end is provided with a plug (13).

3. An adjustable welding preheating device according to claim 2, wherein A fixed support (12) is provided at one end of the heating tube (2), and a nozzle (16) with one end inserted into the center of the heating tube (2) and the other end connected to the natural gas hose (15) is installed on the fixed support (12).

4. An adjustable welding preheating device according to claim 3, wherein The fixed support (12) includes a support plate (17) and a support steel bar (18) welded between the support plate (17) and the heating pipe (2); The nozzle (16) includes a nozzle tube (19), one end of which is provided with an outlet converging tube (20) and the other end is provided with a connecting tube (21) connected to a natural gas hose (15). The nozzle tube (19) is provided with a flow valve (22) for controlling the gas flow rate inside it. The nozzle tube (19) has an external thread on its outer wall, and the support plate (17) has a threaded hole in the center that matches the nozzle tube (19). The threaded hole in the center of the support plate (17) is coaxially distributed with the heating tube (2), and the nozzle tube (19) is threadedly connected to the threaded hole in the center of the support plate (17).

5. An adjustable welding preheating device according to claim 2, wherein Two air outlets (14) form a group of air outlets, and the heating tube (2) has several groups of air outlets evenly distributed along its axial direction.

6. An adjustable welding preheating device according to claim 5, wherein The distance between adjacent air outlet groups is 100mm, the diameter of the air outlet (14) is 3mm, and the distance between two air outlets (14) in the same air outlet group is 2mm.

7. An adjustable welding preheating device according to claim 1, wherein There are at least two height adjustment mechanisms. The height adjustment mechanism includes a sleeve (7) located on one side of the bracket (1) and a slide rod (8) passing through the sleeve (7) and connected to the heating tube (2). The sleeve (7) is provided with a handwheel (9) for pressing and locking the slide rod (8).

8. An adjustable welding preheating device according to claim 7, wherein The handwheel (9) includes a handle (10) and a locking screw (23) on the handle (10); the sleeve (7) has a threaded hole (11) that is compatible with the locking screw (23), the locking screw (23) is threaded into the threaded hole (11) and its end extends into the sleeve (7) and abuts against the top of the slide bar (8).

9. An adjustable welding preheating device according to claim 1, wherein The connecting mechanism includes an H-shaped slide rail (3) located on the other side of the bracket (1), and an electromagnetic chuck (4) slidably mounted on the H-shaped slide rail (3) for adsorbing and fixing onto the component to be preheated.

10. An adjustable welding preheating device according to claim 9, characterized in that, The H-shaped slide rail (3) is equipped with a C-shaped slider (5) that can slide along its length. The C-shaped slider (5) is provided with a connecting rod (6), and the electromagnetic chuck (4) is installed on the connecting rod (6). There are at least two electromagnetic chucks (4), and adjacent electromagnetic chucks (4) are distributed at intervals of 30-80cm.

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