A method of spool welding

Abstract

The application provides a winding drum welding method, which comprises a cylinder, a baffle assembly and a winding drum skin. The cylinder comprises a first cylinder and a second cylinder. The first cylinder and the second cylinder are first welded to form an integrated body, then the baffle assembly is installed on the cylinder, a groove is formed between the cylinder and the baffle assembly, and then the groove is welded in batches and layers, and finally a space is formed between the welding position and the winding drum skin, so that the winding drum can meet the assembly requirements and has high reliability.

Description

Technical Field

[0001] This invention relates to the field of crane drum technology, and more specifically to a drum welding method. Background Technology

[0002] With the development of society and industry, the expansion of industrial production scale and the improvement of automation, cranes are increasingly widely used in modern production processes. In crane machinery, the drum is a crucial load-bearing component. Due to its large size and weight, the drum needs to be welded during production. For example, Chinese patent number 201710795910.7, published on January 9, 2018, discloses a drum welding method, including providing a drum shell and two spoke assemblies; assembling and positioning the two spoke assemblies at both ends of the drum shell; fixing the middle of the two spoke assemblies together using a positioning rod located inside the drum shell; positioning the spoke assemblies between the spoke assemblies and the drum shell using a positioning plate; and welding the spoke assemblies at both ends of the drum shell to the drum shell to obtain the drum.

[0003] The two spoke components of this design are welded inside the cylinder shell, which is relatively simple in structure. However, this welding method is suitable for lightly loaded and moderately sized drums. For drums that are large in volume and bear heavy loads, the cost and difficulty of forming them in one go are high due to the large size of the drum. Welding the hub inside the drum makes the welding method complicated, and welding on the inner wall can easily lead to low welding reliability. Summary of the Invention

[0004] The purpose of this invention is to provide a method for welding rolled tubes that can meet assembly requirements, has high reliability, and is simple to use.

[0005] To achieve the above objectives, a roll welding method includes a roll body, a baffle assembly, and a roll skin, wherein the roll body includes a first roll body and a second roll body; It also includes the following steps: (1) Place two movable support seats on a horizontal surface, and make the two support seats on the same straight line. Then lift the first cylinder and the second cylinder respectively and place them on the support seats. Then move the two support seats relative to each other on the same straight line so that one end of the first cylinder and one end of the second cylinder are in contact. (2) Open a V-shaped bevel on the outside of the fitting area and spot weld inside the V-shaped bevel to achieve initial fixation. Then, open an annular bevel around the outside of the cylinder at the fitting area and fully weld inside the annular bevel to completely weld and fix the first cylinder and the second cylinder into one piece. (3) Fix the baffle assembly at the preset positions at both ends of the cylinder respectively, open the first bevel and the second bevel on both sides of the contact point between the baffle assembly and the cylinder, and then spot weld in the first bevel and the second bevel to achieve preliminary fixation; (4) Complete welding is performed in the second bevel to form the first welding layer. Then the first welding layer is ground to form the first plane, so that the upper side of the first plane forms a gap with one side of the baffle assembly. Then the lower side of the first plane is welded between the inclined part to form the second welding layer. The second welding layer is ground to form the inclined surface. (5) Complete welding is performed in the first bevel. After the welded area cools to room temperature, the roll skin is installed and fixed between the baffle assembly, tightly attached to the outside of the roll body, to complete the roll assembly.

[0006] The above setup, by placing the two support bases on the same straight line on the horizontal ground, and simultaneously enabling the two support bases to drive the first and second cylinders to move relative to each other along the same straight line, ensures that the first and second cylinders are on the same axis. A V-shaped bevel is made at the joint of the first and second cylinders, and spot welding is performed. This initially fixes the first and second cylinders, facilitating subsequent full welding by making an annular bevel on the outer side of the joint. The V-shaped bevel ensures a sufficiently large contact surface for spot welding, while the annular bevel ensures a sufficiently large weld volume, further enhancing the reliability of the connection. The baffle assembly is then fixed at preset positions at both ends of the cylinder, and bevels are made on both sides at the contact point between the baffle assembly and the cylinder to facilitate spot welding, thus initially fixing the baffle assembly. Full welding is then performed within the second bevel to form the first weld layer, which is then ground to form the first... The planar shape allows a gap to be formed between the upper side of the first planar surface and one side of the baffle assembly. A second weld layer is formed by welding between the first planar surface and the inclined portion. The second weld layer is then ground to form an inclined surface, creating a gap between the inclined surface and the drum skin. This allows the drum skin to be tightly installed behind the drum body. The gap between the drum skin and the first planar surface, and the gap between the inclined surface and the chamfer of the drum skin, prevents the wire rope from winding around and pressing against the drum skin. Furthermore, by placing the drum skin on the outside of the drum and covering it, and by using the welded baffle assembly at the first and second weld layers to restrict the lateral direction of the drum skin, the reliability of the drum skin's installation on the drum is ensured. The reliable covering of the drum skin onto the drum body ensures the reliability of the connection between the drum bodies, thus meeting the drum assembly requirements and resulting in high reliability of the assembled drum. Further, the outer side of the drum body has a first planar portion and a second planar portion, and the two ends of the inclined portion are fixedly connected to the first and second planar portions, respectively.

[0007] The above configuration facilitates the installation of the baffle assembly on the first flat surface, followed by welding on the inclined surface to form the second weld layer.

[0008] Furthermore, step (2) also includes: Two or more V-shaped bevels are made on the outside of the joint. After spot welding, an annular bevel is made around the outside of the cylinder at the joint and between the V-shaped bevels. After the annular bevel is fully welded, the V-shaped bevel is fully welded and the weld layer of the V-shaped bevel is welded to the weld layer of the annular bevel to form the same weld layer.

[0009] The above setup effectively welds the joint between the first and second cylinders, ensuring a complete and fixed connection between them to form a single unit.

[0010] Furthermore, step (4) also includes: Welding is performed between the inclined portion and the first plane. When the welding is aligned with the second plane portion, a horizontal welding surface is formed. The horizontal welding surface and the second plane portion are in the same plane. Then, a root fillet weld is performed between the first plane and the horizontal welding surface to form an inclined surface. The inclined surface is then polished.

[0011] The above settings facilitate the formation of an inclined surface and create a gap between the inclined surface and the chamfer of the roll skin.

[0012] Furthermore, one end of the inclined surface is connected to the first plane, and the other end of the inclined surface is connected to the second plane.

[0013] The above configuration, through the connection of the inclined surface and the first plane, can fix the cylinder and the baffle assembly into one piece, while creating a gap between the inclined surface and the roll skin.

[0014] Furthermore, chamfers are formed at the bottom corners of both ends of the roll skin, and the inclined surfaces are parallel to and spaced apart from the outer surfaces where the chamfers are located.

[0015] The above settings facilitate the formation of a gap between the inclined surface and the chamfer of the drum skin, which can accommodate the height of the steel wire rope pressing down on the drum skin.

[0016] Furthermore, the inclined portion and the inclined surface on the outer side of the second weld layer are symmetrically arranged with respect to the plane containing the top surface of the second planar portion.

[0017] The above settings ensure that the amount of welding between the second welding layer and the inclined portion is symmetrically set with the amount of welding between the second welding layer and the second flat portion, thus ensuring the uniformity and reliability of the forces acting between them. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the connection between the first cylinder and the second cylinder in this invention.

[0019] Figure 2 for Figure 1 Enlarged view of point A in the middle.

[0020] Figure 3 for Figure 1 Enlarged view of section B in the middle.

[0021] Figure 4 This is a cross-sectional view of the overall structure of the present invention.

[0022] Figure 5 for Figure 4 Enlarged view of point C in the middle.

[0023] Figure 6 This is a schematic diagram of the roll sheath being installed on the cylinder body in this invention. Detailed Implementation

[0024] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0025] like Figures 1 to 6 As shown, a method for welding a roll includes a roll body, a baffle assembly 3, and a roll skin 4. The roll body includes a first roll body 1 and a second roll body 2. The outer side of the roll body is provided with a first flat portion 11 and a second flat portion 22. The two ends of the inclined portion 5 are fixedly connected to the first flat portion 11 and the second flat portion 22, respectively. The baffle assembly 3 is installed on the first flat portion 11. The bottom corners at both ends of the roll skin 4 are chamfered. It also includes the following steps: (1) Place two movable support seats on a horizontal ground, and make the two support seats on the same straight line. Then lift the first cylinder 1 and the second cylinder 2 respectively and place them on the support seats. Then move the two support seats relative to each other on the same straight line so that one end of the first cylinder 1 is in contact with one end of the second cylinder 2. (2) In this embodiment, as Figure 1 As shown in the figure, the upper part of the cylinder at the fitting point 7 has only formed two V-shaped bevels 8. The lower part of the cylinder at the fitting point further forms an annular bevel 9 after the two V-shaped bevels 8 are formed. Four V-shaped bevels 8 are opened on the outside of the fitting point 7. The four V-shaped bevels 8 are located at the upper and lower ends and the left and right ends of the outer side of the cylinder, respectively. Spot welding is performed in the V-shaped bevels 8 to achieve initial fixation. After spot welding, an annular bevel 9 is opened around the outer side of the cylinder at the fitting point 7 and between the V-shaped bevels 8. Complete welding is performed in the annular bevel 9. Then, complete welding is performed in the V-shaped bevels 8. Finally, the welding layer 81 of the V-shaped bevel 8 and the welding layer 91 of the annular bevel 9 are welded to form the same welding layer, so that the first cylinder 1 and the second cylinder 2 are completely welded and fixed to form a whole.

[0026] (3) In this embodiment, the baffle assembly is fixed at the preset positions at both ends of the cylinder by means of the fixed flange and the adjustable thrust rod, which has been specifically described in the document with patent number 202211364502.3, and will not be repeated here. Then, the first bevel and the second bevel are opened on both sides of the contact between the baffle assembly 3 and the cylinder, and then spot welding is performed in the first bevel and the second bevel to achieve preliminary fixation.

[0027] (4) Complete welding is performed in the second bevel to form the first weld layer 01. Then, the first weld layer 01 is ground to form the first plane 211, so that the upper side of the first plane 211 forms a gap 33 with one side of the baffle assembly 3. Then, welding is performed between the lower side of the first plane 211 and the inclined part 5. When the welding is performed until it is aligned with the second plane part 22, a horizontal weld surface 44 is formed. At this time, the horizontal weld surface 44 and the second plane part 22 are in the same plane. Then, root fillet welding is performed between the first plane 211 and the horizontal weld surface 44 to form an inclined surface 55. It is ensured that the height of the inclined surface 55 is parallel and matched with the outer side of the chamfer. At the same time, one end of the inclined surface 55 is connected to the first plane 211, and the other end of the inclined surface 55 is connected to the first plane 211. The second planar portion 22 is connected, and finally a second welding layer 02 is formed between the inclined portion 5 and the first planar portion 211, and the inclined surface 55 is polished. In this embodiment, an angle α is formed between the inclined surface 55 and the first planar portion 211, and the angle α is set to 150°. An angle b is formed between the inclined surface 55 and the second planar portion 22, and the angle b is set to 150°. At the same time, the inclined portion and the inclined surface 55 on the outside of the second welding layer are symmetrically arranged with respect to the plane on which the top surface of the second planar portion 22 is located. That is, the height of the inclined surface 55 from the second planar portion 22 is equal to the height of the bottom of the inclined portion from the second planar portion 22, so that the second welding layer 02 can be uniformly connected between the first planar portion 11, the inclined portion 5 and the second planar portion 22.

[0028] (5) Complete welding is performed in the first bevel. After the welded area cools down to room temperature, the roll skin 4 is placed between the baffle assembly 3 and the roll skin 4 is tightly attached to the outside of the drum. Then, it is fixed to the outside of the drum by screws 10 to complete the roll assembly.

[0029] The working principle of this invention is as follows: By setting two support seats on the same straight line on a horizontal surface, and simultaneously causing the two support seats to move relative to the first cylinder 1 and the second cylinder 2 on the same straight line, it is ensured that the first cylinder 1 and the second cylinder 2 are on the same axis. A V-shaped bevel 8 is opened at the joint of the first cylinder 1 and the second cylinder 2 and spot welded, which initially fixes the first cylinder 1 and the second cylinder 2, facilitating subsequent opening of an annular bevel 9 on the outside of the joint 7 for complete welding. The V-shaped bevel 8 ensures that the contact surface is large enough to achieve spot welding, and the annular bevel 9 ensures that the welding volume is large enough to further increase... To ensure the reliability of the strong connection, the baffle assembly 3 is fixed at preset positions at both ends of the cylinder. Bevels are then made on both sides of the contact point between the baffle assembly 3 and the cylinder to facilitate spot welding, thus achieving initial fixation of the baffle assembly 3. Complete welding is then performed within the second bevel to form a first weld layer 01. The first weld layer 01 is then ground to form a first plane 211, creating a gap between the upper side of the first plane 211 and one side of the baffle assembly 3. Simultaneously, welding is performed between the first plane 211 and the inclined portion 5 to form a second weld layer 02. The second weld layer 02 is then ground to form an inclined surface 55, ensuring that the inclined surface 55... A gap is formed between the drum skins 4, allowing the drum skins to be tightly installed behind the drum body. A gap is also formed between the drum skin 4 and the first plane 211, and a gap is formed between the inclined surface 55 and the chamfer of the drum skin 4. This prevents the wire rope from winding around and pressing against the drum skin 4. Furthermore, by placing the drum skin 4 on the outside of the drum and covering it, and by forming a baffle assembly 3 at the first weld layer 01 and the second weld layer 02 to restrict the lateral direction of the drum skin 4, the reliability of the drum skin 4's installation on the drum is ensured. The reliable covering of the drum skin 4 onto the drum body ensures the connection between the drum bodies. This ensures high reliability, meeting the assembly requirements of the drum and resulting in high reliability of the assembled drum. Furthermore, the first welding layer 01 reliably connects the baffle assembly 3 to the first flat portion 11 of the drum body. The second welding layer 02 is provided between the baffle assembly 3, the second flat portion 22, and the inclined surface, thereby reliably connecting the first welding layer 01 and the second flat portion 22. The connection is further improved by stretching the tail of the welding layer. The second welding layer 02 is also set as an inclined portion 5, which corresponds to the inclined portion 5, thus ensuring the stability of the connection between the second welding layer 02, the inclined surface 55, and the second flat portion 22.

Claims

1. A method for welding a roll, comprising a roll body, a baffle assembly, and a roll sheath, wherein the roll body includes a first roll body and a second roll body; the outer side of the roll body is provided with a first planar portion, an inclined portion, and a second planar portion, the two ends of the inclined portion being fixedly connected to the first planar portion and the second planar portion respectively; chamfers are formed at the bottom corners of both ends of the roll sheath, and the height of the inclined surface is parallel to and spaced apart from the outer side where the chamfer is located; characterized in that: It also includes the following steps: (1) Place two movable support seats on a horizontal surface, and make the two support seats on the same straight line. Then lift the first cylinder and the second cylinder respectively and place them on the support seats. Then move the two support seats relative to each other on the same straight line so that one end of the first cylinder and one end of the second cylinder are in contact. (2) Open a V-shaped bevel on the outside of the fitting area and spot weld inside the V-shaped bevel to achieve initial fixation. Then, open an annular bevel around the outside of the cylinder at the fitting area and fully weld inside the annular bevel to completely weld and fix the first cylinder and the second cylinder into one piece. (3) Fix the baffle assembly at the preset positions at both ends of the cylinder respectively, open the first bevel and the second bevel on both sides of the contact point between the baffle assembly and the cylinder, and then spot weld in the first bevel and the second bevel to achieve preliminary fixation; (4) Complete welding is performed in the second bevel to form the first welding layer. Then the first welding layer is ground to form the first plane, so that the upper side of the first plane forms a gap with one side of the baffle assembly. Then the lower side of the first plane is welded between the inclined part to form the second welding layer. The second welding layer is ground to form the inclined surface. (5) Complete welding is performed in the first bevel. After the welded area cools to room temperature, the roll skin is installed and fixed between the baffle assembly, tightly attached to the outside of the roll body, to complete the roll assembly.

2. The method for welding a roll according to claim 1, characterized in that: Step (2) also includes: Two or more V-shaped bevels are made on the outside of the joint. After spot welding, an annular bevel is made around the outside of the cylinder at the joint and between the V-shaped bevels. After the annular bevel is fully welded, the V-shaped bevel is fully welded and the weld layer of the V-shaped bevel is welded to the weld layer of the annular bevel to form the same weld layer.

3. The method for welding a roll according to claim 1, characterized in that: Step (4) also includes: Welding is performed between the inclined portion and the first plane. When the welding is aligned with the second plane portion, a horizontal welding surface is formed. The horizontal welding surface and the second plane portion are in the same plane. Then, a root fillet weld is performed between the first plane and the horizontal welding surface to form an inclined surface. The inclined surface is then polished.

4. The method for welding a roll according to claim 3, characterized in that: One end of the inclined surface is connected to the first plane, and the other end of the inclined surface is connected to the second plane.

5. The method for welding a roll according to claim 1, characterized in that: The inclined portion and the inclined surface on the outside of the second weld layer are symmetrically arranged with respect to the plane containing the top surface of the second flat portion.

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