An insulating cylinder welding device

Abstract

This invention relates to the technical field of insulating cylinder processing, and more particularly to an insulating cylinder welding device. The device includes a frame, on which a welding support frame for supporting insulating material and a hot-melt unit for welding the insulating material are mounted. The hot-melt unit is defined to weld the insulating material as it moves from right to left. The welding support frame is provided with a first positioning structure for positioning one end face of the lower overlapping end of the insulating material, parallel to the movement direction of the hot-melt unit, thereby defining the placement position of the insulating material on the welding support frame. This invention primarily solves the technical problems in the prior art where the welding position of each insulating cylinder is inconsistent and the overlap width of the insulating material is difficult to determine during the production of insulating cylinders.

Description

Technical Field

[0001] This invention relates to the technical field of insulating cylinder processing, and more particularly to an insulating cylinder welding apparatus. Background Technology

[0002] In dry-type transformers, the insulating cylinder is installed between the high-voltage and low-voltage coils to increase the creepage distance, improve the electric field distribution, shorten the distance between the high-voltage and low-voltage coils, and improve the insulation effect. The insulating cylinder can also be used in iron-core reactors and installed between the coil and the iron core.

[0003] Currently, a relatively simple method for manufacturing insulating cylinders in the market is to roll up a flexible composite material to form two opposing overlapping ends. After the composite material is rolled up, one overlapping end is on the upper layer and the other on the lower layer. The two overlapping ends overlap to form an overlapping area, and welding is performed at the overlapping area to produce an insulating cylinder from the insulating composite material. For example, Chinese invention patent application CN108724738A discloses an insulating cylinder welding device. This device includes a frame, which includes a horizontal base and a column set at one end of the horizontal base. The upper end of the column has a crossbeam parallel to the horizontal base, and a lead screw is installed on the crossbeam in the same direction as its extension. The lead screw is driven to rotate by a speed-regulating motor mounted on the column. The speed-regulating motor is located on the side of the column opposite to the crossbeam. The rotation of the lead screw can drive the hot-melt unit on it to move along its length. The column also has a support member (i.e., welding support frame) on the lower side of the crossbeam for supporting the insulating material plate (i.e., the insulating material). A telescopic cylinder is installed on the crossbeam. A pressure bar is connected to the lower output end of the telescopic cylinder. The length direction of the pressure bar is consistent with the length direction of the crossbeam. The telescopic cylinder can move the pressure bar closer to and away from the support. When it moves closer to the support, it can press the two opposite edges of the insulation board material onto the support.

[0004] The aforementioned equipment can effectively bond the overlapping joints of the insulating cylinders together by hot-melt welding. However, when placing the insulating material on the support, it is difficult to control the placement position of the insulating board, resulting in inconsistencies between the overlapping area of ​​each insulating cylinder and the corresponding position of the hot-melt unit. This leads to inconsistent welding positions, and the overlapping width of the insulating material is also difficult to determine, resulting in poor product consistency and difficulty in acceptance. Summary of the Invention

[0005] The purpose of this invention is to provide an insulating cylinder welding device, which mainly solves the technical problems in the prior art where the overlapping area and the corresponding position of the hot melt unit are inconsistent during the production of insulating cylinders, resulting in inconsistent welding positions for each insulating cylinder and difficulty in determining the overlap width of the insulating material.

[0006] To achieve the above objectives, the insulating cylinder welding device of the present invention adopts the following technical solution:

[0007] An insulating cylinder welding device includes a frame, a welding support frame for supporting insulating material, and a hot melt unit for welding the insulating material. The hot melt unit is defined to weld the insulating material when it moves from right to left. The welding support frame is provided with a first positioning structure for positioning one end face of the lower overlapping end of the insulating material that is parallel to the movement direction of the hot melt unit, so as to limit the placement position of the insulating material on the welding support frame.

[0008] The beneficial effects of the above technical solution are as follows: by setting a first positioning structure on the welding support frame for positioning the lower overlapping end when it is placed parallel to the left and right direction of the welding support frame, the placement position of the lower overlapping end can be accurately determined when the insulating material is placed on the welding support frame. Once the overlapping position of the lower layer is determined, the overlapping position of the upper overlapping end can be easily determined, thereby accurately determining the overlapping width and ensuring the determination of the welding position of the hot melt unit. This solves the technical problem that the overlapping area of ​​each insulating tube is inconsistent with the corresponding position of the hot melt unit during the production of insulating tubes, resulting in inconsistent welding positions and difficulty in determining the overlapping width of the insulating material.

[0009] As a further optimized technical solution, the first positioning structure is a first positioning protrusion that is fixedly connected to the bottom of the welding support frame.

[0010] The beneficial effects of the above technical solution are as follows: by selecting the first positioning structure as the first positioning protrusion, the protrusion can play a role in stopping the insulating material, thereby making it easier to determine the placement position of the insulating material and achieving a better positioning effect.

[0011] As a further optimized technical solution, the hot-melt unit includes a heating gun for spraying high-temperature hot air outward to melt the upper and lower overlapping ends of the insulating material. A roller for pressing the upper and lower overlapping ends of the insulating material is provided on the right side of the heating gun. A guide rod for separating the upper and lower overlapping ends is provided on the left side of the heating gun. The bottom end of the guide rod is L-shaped so that it can extend into the overlapping area formed between the upper and lower overlapping ends. The height of the first positioning protrusion is greater than the thickness of the insulating material. The right end face of the first positioning protrusion is flush with the right end face of the insulating material or the right end face of the first positioning protrusion is located to the right or left of the right end face of the insulating material so that the guide rod can directly extend between the upper and lower overlapping ends.

[0012] The beneficial effects of the above technical solution are as follows: by setting a heating gun, the heating gun can spray high-temperature hot air outward, thereby melting the material itself at the overlapping end of the insulation material. The melted overlapping end can be pressed together by the roller on the back of the heating gun to complete the welding. By making the height of the first positioning protrusion higher than the thickness of the insulation material, a gap can be formed between the upper and lower overlapping ends, which makes it convenient for the guide rod to directly enter the gap between the upper and lower overlapping ends. The degree of automation is high. The guide rod is not only used to separate the upper and lower insulation material overlapping ends, making it convenient for the bottom nozzle of the heating gun to directly penetrate into the overlapping area for heating, but also helps to reduce the forward resistance of the heating gun and avoid damage to the heating gun.

[0013] As a further optimized technical solution, the first positioning protrusion is a strip-shaped protrusion extending in the left-right direction, so as to confine the hot air ejected by the heating gun within the overlapping area.

[0014] The beneficial effects of the above technical solution are as follows: by extending the first positioning protrusion to the left and right, the hot air sprayed from the heating gun can be confined to the overlapping area, thereby concentrating the heat in the overlapping area to quickly melt the insulating material, which is convenient for welding. At the same time, it can also prevent the heat from passing through the overlapping area and causing positional deformation of the non-overlapping area of ​​the insulating material, thus affecting the quality of the insulating cylinder.

[0015] As a further optimized technical solution, the length of the first positioning protrusion is greater than or equal to the length of the insulating material.

[0016] The beneficial effect of the above technical solution is that it can better block hot air during the welding process.

[0017] As a further optimized technical solution, the welding support frame is also provided with a second positioning structure for positioning one end face of the lower overlapping end of the insulation material perpendicular to the left and right direction.

[0018] The beneficial effect of the above technical solution is that by setting a second positioning structure, it is convenient to position the insulating material along the left and right directions of the welding support frame when placing the insulating material.

[0019] As a further optimized technical solution, the second positioning structure is a second positioning protrusion fixedly connected to the bottom of the welding support frame, and the second positioning protrusion is located at a position offset from the traveling direction of the hot melt unit.

[0020] The beneficial effects of the above technical solution are as follows: by selecting the second positioning structure as the second positioning protrusion, the protrusion can play a role in stopping the insulating material, thereby making it easier to determine the placement position of the insulating material and achieving a better positioning effect. Setting the second positioning protrusion at a position offset from the traveling direction of the hot melt unit is to avoid interference between the hot melt unit and the second protrusion, thereby avoiding damage to the hot melt unit.

[0021] As a further optimized technical solution, the second positioning protrusion is located at the right end of the welding support frame.

[0022] The advantages of the above technical solution are: compared with setting the second positioning protrusion at the left end of the welding support frame, it is more convenient to remove the processed insulating cylinder, and the second protrusion is avoided from colliding with and damaging the insulating cylinder during the removal process.

[0023] As a further optimized technical solution, the frame includes a vertically arranged support column, the right end of the welding support frame is fixedly connected to the support column, and the insulating cylinder welding device also includes a support structure that supports and cooperates with the left end of the welding support frame to prevent the welding support frame from bending and deforming downward.

[0024] The beneficial effects of the above technical solution are as follows: During the processing of the welding insulation cylinder, the welding support frame is in a cantilever beam stress state. Under the action of the hot melt unit, the left end of the welding support frame is prone to bending and deforming downward. In order to avoid this situation, the insulation cylinder welding device is also equipped with a support structure to provide better support for the welding support frame, avoid deformation of the welding support frame, and thus ensure the welding quality of the insulation cylinder overlap.

[0025] As a further optimized technical solution, a crossbeam is provided on the frame parallel to the welding support frame above it. The support structure is a support rod, the upper end of which is detachably or rotatably connected to the left end of the crossbeam, and the lower end of which is detachably connected to the left end of the welding support frame.

[0026] The beneficial effect of the above technical solution is that, during the welding of the insulating cylinder, the welding support frame is supported by the support rod on the crossbeam, which can prevent the welding support frame from bending downward under the action of the roller. Attached Figure Description

[0027] Figure 1 This is a schematic front view of the overall structure of the insulating cylinder welding device of the present invention;

[0028] Figure 2 This is a left-side view of the overall structure of the insulating cylinder welding device of the present invention;

[0029] Figure 3 yes Figure 1 Enlarged schematic diagram of the welded structure in the middle;

[0030] Figure 4 yes Figure 1 Enlarged schematic diagram of the pressing structure.

[0031] In the diagram: 1. Frame; 101. Welding support frame; 102. Crossbeam; 2. Insulating material; 3. Telescopic cylinder; 31. Press block; 4. Guide rod; 5. Lead screw; 6. Drive motor; 7. Slider; 8. Heating gun; 9. Roller; 10. Support structure; 11. Second positioning structure; 12. First positioning structure; 13. Guide rod. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention; that is, the described embodiments are merely some embodiments of the invention, not all embodiments. The components of the embodiments of the invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0034] It should be noted that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any actual relationship or order between these entities or operations. Furthermore, terms such as "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0035] The features and performance of the present invention will be further described in detail below with reference to embodiments.

[0036] Embodiment 1 of the insulating cylinder welding device of the present invention:

[0037] like Figure 1 and Figure 4As shown, the insulating cylinder welding device includes a frame 1, on which a vertically arranged support column is mounted. A welding support frame 101 is installed on the support column. A crossbeam 102 parallel to the welding support frame 101 and fixedly connected to the support column is also installed on the column. A telescopic cylinder 3 for pressing the insulating material is installed on the crossbeam 102. A pressure block 31 is provided at the bottom end of the telescopic cylinder 3. A hot melt unit is slidably connected to the crossbeam 102. The hot melt unit slides along the crossbeam 102 to weld the insulating material 2 placed on the welding support frame 101. For ease of description, it is defined that the hot melt unit welds the insulating material 2 when it moves from right to left.

[0038] In this embodiment, to facilitate the movement of the hot-melt unit on the crossbeam 102, a guide rod 4 is installed below the crossbeam 102, and a lead screw 5 is installed below the guide rod 4. One end of the lead screw 5 is connected to a drive motor 6, which is mounted on a support column. The hot-melt unit moves left and right on the crossbeam 102 for welding operations by means of a slider 7 at its top threadedly engaging with the lead screw 5 and slidingly connecting with the guide rod 4. The welding support frame 101 is provided with a first positioning structure 12 for positioning one end face of the overlapping end of the insulation material 2 parallel to the direction of movement of the hot-melt unit, thereby limiting the placement position of the insulation material 2 on the welding support frame 101. This means that when placing the insulating material, the lower overlapping end can be accurately positioned along the front and back direction of the welding support frame 101. Once the overlapping position of the lower layer is determined, the movement trajectory of the hot melt unit on the lower overlapping end is determined, which makes it easier to position the upper overlapping end and determine the overlapping width. In order to accurately determine the overlapping width, the position of the upper overlapping end covering the lower overlapping end can be determined by measurement, thereby ensuring that the overlapping area of ​​each insulating cylinder is consistent with the corresponding position of the hot melt unit, thus determining a uniform welding position. This solves the technical problems of inconsistent welding positions of each insulating cylinder and difficulty in determining the overlapping width of the insulating material during the production of insulating cylinders.

[0039] In this embodiment, in order to make the first positioning structure 12 achieve a better positioning effect, the first positioning structure 12 is a first positioning protrusion that is fixedly connected to the welding support frame 101 at the bottom.

[0040] like Figure 2 and Figure 3As shown, the hot-melt unit includes a heating gun 8 for melting the material of the overlapping end of the insulation material 2. The heating gun 8 sprays high-temperature hot air outward. The heating gun 8 is a common electric heating gun. At the same time, the high-temperature hot air sprayed outward melts the insulation material 2. A roller 9 is provided on the right side of the heating gun 8 for pressing the melting position of the overlapping end of the insulation material 2. A guide rod 13 is provided on the left side of the heating gun 8 for separating the upper overlapping end from the lower overlapping end. The bottom end of the guide rod 13 is L-shaped so that it can extend into the overlapping area of ​​the insulation material 2. The guide rod 13 not only separates the overlapping ends of the upper and lower insulation materials 2, making it easier for the bottom nozzle of the heating gun 8 to penetrate into the overlapping area for heating, but also helps to reduce the forward resistance of the heating gun 8 and avoid damage to the heating gun 8. The height of the first positioning protrusion is higher than the thickness of the insulation material 2. The right end face of the first positioning protrusion is flush with the right end face of the insulation material 2, so that a gap is formed between the upper overlapping end and the lower overlapping end so that the guide rod 13 can directly extend into the overlapping area.

[0041] In order to confine the hot air ejected from the heating gun 8 within the overlapping area, thereby concentrating the heat in the overlapping area to quickly melt the insulating material 2 and facilitate welding, and at the same time prevent the heat from passing through the overlapping area and causing positional deformation of the non-overlapping area of ​​the insulating material 2, which would affect the quality of the insulating cylinder, the first positioning protrusion is set as a strip-shaped protrusion extending in the left and right direction, so as to confine the hot air ejected from the heating gun 8 within the overlapping area. In order to further ensure the above effect, the length of the first positioning protrusion is set to be greater than or equal to the length of the insulating material 2, so that the first positioning protrusion can play the above role throughout the welding process.

[0042] To facilitate the positioning of the insulating material 2 along the left and right directions of the welding support frame during placement, the welding support frame 101 is also provided with a second positioning structure 11 for positioning the end face of the overlapping end of the insulating material 2 perpendicular to the direction of movement of the hot melt unit. At the same time, in order to further ensure the positioning effect of the second positioning structure and enable the second positioning structure 11 to better stop the insulating material 2, the second positioning structure 11 is a second positioning protrusion fixedly connected to the bottom of the welding support frame 101. In order to avoid interference between the hot melt unit and the second protrusion, which would cause damage to the hot melt unit, the second positioning protrusion is located at a position offset from the direction of travel of the hot melt unit. In order to facilitate the disassembly of the welded insulating cylinder, the second positioning protrusion is located at the right end of the welding support frame 101.

[0043] Since one end of the welding support frame 101 is fixedly connected to the support column, during the processing of the welding insulating cylinder, the welding support frame 101 is in a cantilever beam stress state. Under the action of the hot melt unit, the left end of the welding support frame 101 is prone to bending and deforming downwards. To avoid this situation, the device also includes a support structure 10 that cooperates with the left end of the welding support frame 101 to prevent the welding support frame 101 from bending and deforming downwards. In this embodiment, the support structure 10 is a support rod. The upper end of the support rod is detachably or rotatably connected to the left end of the crossbeam 102, and the lower end of the support rod is detachably connected to the left end of the welding support frame 101. The support rod can be detachably connected to the left end of the crossbeam 102 by screws, or it can be rotatably connected to the crossbeam 102 by using pins. The support rod can be detachably fixed to the welding support frame 101 by bolts, or it can be connected to the welding support frame 101 by setting a hook at the bottom of the support rod to provide support when welding the insulating material. After the welding operation is completed, the lower end of the support rod can be disconnected from the welding support rod 101 to facilitate the removal of the welded insulating support cylinder. It is necessary to ensure that the support rod provides support to the welding support frame 101 during the welding process to prevent the welding support frame 101 from bending and deforming downwards.

[0044] In this embodiment, for ease of operation, an existing control system can be added to the device, and the operation buttons of the control system can be integrated together for easier operation. For example, an electrical control box can be installed above the crossbeam, and the electrical control box can be equipped with a series of auxiliary components such as a hot air adjustment knob and pressure gauge, a cylinder adjustment knob and pressure gauge, a work switch, a power indicator light, and a power switch to facilitate operation and observation of the device's working status.

[0045] In practice, the insulating material 2 is first placed at a suitable position along the front-to-back direction on the welding support frame 101 via the first positioning structure 12, thus determining the circumferential positioning of the insulating cylinder and ensuring a suitable overlap area. Then, the second positioning structure 11 determines the suitable position of the insulating material 2 along the left-to-right direction on the welding support frame 101, thus determining the axial positioning of the insulating cylinder. By activating the device, the drive motor 6 rotates forward, driving the hot melt unit forward. The heating gun 8 heats and melts the overlap area of ​​the insulating material 2. At this time, by setting the first positioning structure to be higher than the thickness of the insulating material and extending left and right along the welding support frame 101, the guide rod 13 can easily enter the overlap area directly. During the welding process, the hot air ejected from the heating gun 8 can be confined to the overlapping area, thereby concentrating the heat in the overlapping area to quickly melt the insulating material, facilitating welding. At the same time, it can also prevent the heat from passing through the overlapping area and causing deformation of the non-overlapping area of ​​the insulating material, which would affect the quality of the insulating cylinder. The molten overlapping end is pressed and bonded by the right-side roller 9. The hot melt unit moves to the left end of the insulating material 2, the guide rod 13 moves out of the overlapping area, the heating gun 8 stops working, the drive motor 6 reverses, and the hot melt unit is reset to the right end of the welding support frame 101. The drive motor 6 stops rotating, the connection between the support structure 10 and the welding support frame 101 is opened, and the insulating cylinder is removed.

[0046] In other embodiments of the insulating cylinder welding device: The difference between this embodiment and embodiment 1 is that in embodiment 1 the support structure is a buckle plate set on the crossbeam to tie the welding support frame. In this embodiment, the support structure is a support rod that is detachably connected to the bottom left end of the welding support frame. When welding insulating material, the support rod is installed at the bottom left end of the welding support frame to support the welding support frame and prevent it from deforming. After welding is completed, the support rod can be removed so that the processed insulating cylinder can be taken off.

[0047] In other embodiments of the insulating cylinder welding device: The difference between this embodiment and embodiment 1 is that in embodiment 1, a support structure is provided at the left end of the welding support frame, while in this embodiment, the support structure may not be provided.

[0048] In other embodiments of the insulating cylinder welding device: The difference between this embodiment and embodiment 1 is that in embodiment 1 the second positioning protrusion is located at the right end of the welding support frame, while in this embodiment the second positioning protrusion is located at the left end of the welding support frame. When placing the insulating material, the second positioning protrusion at the left end can also position one end of the insulating material.

[0049] In other embodiments of the insulating cylinder welding device: The difference between this embodiment and embodiment 1 is that in embodiment 1, the second positioning structure is a second positioning protrusion fixedly connected to the bottom of the welding support frame. In this embodiment, the second positioning structure can be a groove line opened on the top surface of the welding support frame. When the worker places the insulating material, the position of the groove line can ensure the placement position of the insulating material on the welding support frame.

[0050] In other embodiments of the insulating cylinder welding device: The difference between this embodiment and embodiment 1 is that in embodiment 1, a second positioning structure is provided on the welding support frame for positioning one end face of the overlapping end of the insulating material perpendicular to the direction of movement of the hot melt unit. In this embodiment, the second positioning structure may not be provided.

[0051] In other embodiments of the insulating cylinder welding device: The difference between this embodiment and embodiment 1 is that in embodiment 1, the length of the first positioning protrusion is greater than or equal to the length of the insulating material. In this embodiment, the length of the first positioning protrusion is slightly shorter than the length of the insulating material, and the function of the first positioning protrusion can still be achieved.

[0052] In other embodiments of the insulating cylinder welding device: The difference between this embodiment and embodiment 1 is that in embodiment 1, the first positioning protrusion is a strip-shaped protrusion extending in the left and right direction. In this embodiment, the first positioning protrusion may not extend in the left and right direction. At this time, the first positioning protrusion is a block-shaped protrusion located only at the right end of the welding support frame. The first positioning protrusion can play a positioning function to facilitate the placement of the guide rod into the overlapping area and the placement of the insulating material.

[0053] In other embodiments of the insulating cylinder welding device: The difference between this embodiment and embodiment 1 is that in embodiment 1, the right end face of the first positioning protrusion is flush with the right end face of the insulating material. In this embodiment, the right end face of the first positioning protrusion is located to the right of the right end face of the insulating material. When the right end face of the first positioning protrusion is located to the right of the right end face of the insulating material, the upper overlapping end of the insulating material rests on the first positioning protrusion, and the upper overlapping end will be tilted upward, thereby facilitating the insertion of the guide rod.

[0054] In other embodiments of the insulating cylinder welding device: The difference between this embodiment and embodiment 1 is that in embodiment 1, the right end face of the first positioning protrusion is flush with the right end face of the insulating material. In this embodiment, the right end face of the first positioning protrusion is located to the left of the right end face of the insulating material 2. At this time, the right end face of the first positioning protrusion is located to the left of the right end face of the insulating material 2, slightly closer to the right end. Since the insulating material has a certain thickness, under the support force of the insulating material itself, the support of the first positioning protrusion on the upper overlapping end of the insulating material can also enable the guide rod to be placed in the overlapping area.

[0055] In other embodiments of the insulating cylinder welding device: The difference between this embodiment and embodiment 1 is that in embodiment 1, the first positioning structure is a first positioning protrusion fixedly connected to the bottom of the welding support frame. In this embodiment, the first positioning structure can also be a groove line opened on the top surface of the welding support frame. When the worker places the insulating material, the position of the groove line can ensure the placement position of the lower overlapping end of the insulating material on the welding support frame.

[0056] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. The scope of patent protection of the present invention shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present invention shall also be included within the scope of protection of the present invention.

Claims

1. A welding apparatus for insulating cylinders between high-voltage and low-voltage coils of a dry-type transformer, comprising a frame (1), a welding support frame (101) for supporting the insulating cylinder (2) and a hot-melt unit for welding the insulating cylinder (2), wherein the hot-melt unit is defined to weld the insulating cylinder (2) when moving from right to left, characterized in that, The welding support frame (101) is provided with a first positioning protrusion (12) for positioning one end face of the lower overlapping end of the insulating cylinder (2) parallel to the direction of movement of the hot melt unit, so as to limit the circumferential placement position of the insulating cylinder (2) on the welding support frame (101); the first positioning protrusion is a strip-shaped protrusion that is fixedly connected to the bottom of the welding support frame and extends in the left and right direction. The length of the strip-shaped protrusion is greater than or equal to the length of the insulating cylinder, and the height of the strip-shaped protrusion is configured to be greater than the thickness of the insulating cylinder, so that the upper overlapping end of the insulating cylinder is placed on the strip-shaped protrusion and then tilts upward, forming a gap with the lower overlapping end.

2. The welding device for the insulating cylinder between the high-voltage and low-voltage coils of a dry-type transformer according to claim 1, characterized in that, The frame includes vertically arranged support columns, a welded support frame fixed on the support columns, and a crossbeam parallel to and above the welded support frame fixed on the support columns. A telescopic cylinder for pressing the insulating cylinder is installed on the crossbeam, and a pressure block is provided at the bottom of the telescopic cylinder.

3. The welding device for the insulating cylinder between the high-voltage and low-voltage coils of a dry-type transformer according to claim 1, characterized in that, The hot-melting unit includes a heating gun (8) for spraying high-temperature hot air outward to melt the upper and lower overlapping ends of the insulating cylinder (2). A roller (9) for pressing the upper and lower overlapping ends of the insulating cylinder (2) is provided on the right side of the heating gun (8). A guide rod (13) for separating the upper and lower overlapping ends is provided on the left side of the heating gun (8). The bottom end of the guide rod (13) is L-shaped so that it can extend into the overlapping area formed between the upper and lower overlapping ends. The right end face of the first positioning protrusion is flush with the right end face of the insulating cylinder (2) or the right end face of the first positioning protrusion is located to the right or left of the right end face of the insulating cylinder (2) so that the guide rod (13) can directly extend into the space between the upper and lower overlapping ends.

4. The welding device for the insulating cylinder between the high-voltage and low-voltage coils of a dry-type transformer according to claim 3, characterized in that, The welding support frame is also equipped with a second positioning structure for positioning the right end face of the lower overlapping end of the insulating cylinder, and the guide rod is located on the left side of the second positioning structure.

5. The welding device for the insulating cylinder between the high-voltage and low-voltage coils of a dry-type transformer according to claim 1, characterized in that, The frame includes vertically arranged support columns, a welding support frame fixed on the support columns, and a crossbeam parallel to and above the welding support frame fixed on the support columns. A guide rod is installed below the crossbeam, and a lead screw is installed below the guide rod. One end of the lead screw is connected to a drive motor, which is mounted on the support columns. The hot melt unit moves left and right on the crossbeam to perform welding operations by means of a slider at its top that engages with the lead screw thread and slides with the guide rod.

6. The welding apparatus for the insulating cylinder between the high-voltage and low-voltage coils of a dry-type transformer according to any one of claims 1-3 and 5, characterized in that, The welding support frame (101) is also provided with a second positioning structure (11) for positioning one side end face of the lower overlapping end of the insulating cylinder (2) perpendicular to the left and right direction.

7. The welding apparatus for the insulating cylinder between the high-voltage and low-voltage coils of a dry-type transformer according to claim 6, characterized in that, The second positioning structure (11) is a second positioning protrusion that is fixedly connected to the bottom of the welding support frame (101). The second positioning protrusion is located at a position offset from the traveling direction of the hot melt unit.

8. The welding apparatus for the insulating cylinder between the high-voltage and low-voltage coils of a dry-type transformer according to claim 7, characterized in that, The second positioning protrusion is located at the right end of the welding support frame (101).

9. The welding device for the insulating cylinder between the high-voltage and low-voltage coils of a dry-type transformer according to claim 1, characterized in that, The frame (1) includes a vertically arranged support column. The right end of the welding support frame (101) is fixedly connected to the support column. The welding device for the insulating cylinder between the high and low voltage coils of the dry-type transformer also includes a support structure (10) that supports and cooperates with the left end of the welding support frame (101) to prevent the welding support frame (101) from bending and deforming downward.

10. The welding apparatus for the insulating cylinder between the high-voltage and low-voltage coils of a dry-type transformer according to claim 9, characterized in that, A crossbeam (102) is provided on the frame (1) above the welding support frame (101). The support structure (10) is a support rod. The upper end of the support rod is detachably connected or rotatably connected to the left end of the crossbeam (102), and the lower end of the support rod is detachably connected to the left end of the welding support frame (101).

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