A spiral welding method

Abstract

The present invention provides a spiral welding method, which relates to the technical field of pipe fitting welding. The present invention comprises the following steps: causing the spiral pipe to move spirally along its own pitch; using inner and outer clamping wheels to apply pressure to the joint seam so that the joint seam is tightly joined, one of the inner and outer clamping wheels is provided with a welding anode located on its peripheral wall, and the other is provided with a welding cathode located on its peripheral wall, and the joint seam is welded by the welding anode and the welding cathode; during the welding process, at least one of the inner and outer clamping wheels is controlled to actively rotate; during the welding process, the spiral pipe is pushed to move spirally toward the inner and outer clamping wheel sides so that the spiral pipe moves spirally according to its own pitch. Compared with the prior art, the present invention has the advantages of simpler welding process of spiral pipe fittings, more convenient operation, reduced production costs, and suitable for large-scale production.

Description

Technical Field

[0001] The invention relates to the technical field of pipe fitting welding, and in particular to a spiral welding method. Background Art

[0002] Metal tubular filters are widely used in industries such as oil and gas, agriculture, medical treatment, aerospace and navigation, chemical industry, and food processing, mainly used in pipelines, filtration systems, and high-precision equipment. These fields have strict requirements on the strength, corrosion resistance, filtration accuracy, and durability of the filters, and the market demand is growing.

[0003] The Chinese patent application publication number CN117862279A discloses a rigid tube blank and its skeleton structure, including a spiral frame, the cross section of which includes a first bending portion, a straight portion, and a second bending portion arranged in sequence along the connection direction. In application, the frame will be used in conjunction with the functional body. When the frame is used in conjunction with the functional body, one side of the functional body is connected to the first bending portion, and the other side is connected to the second bending portion. By welding the connection between the functional body and the first bending portion and the second bending portion, a spiral tube structure is finally formed.

[0004] However, the welding process of this spiral pipe structure is relatively complicated, resulting in high production costs. The high cost not only limits the efficiency of large-scale production, but also weakens the market competitiveness of the product, hindering its promotion and application in various industries. Summary of the invention

[0005] In order to solve the above problems, the present application provides a spiral welding method.

[0006] The present application provides a spiral welding method, which adopts the following technical solution:

[0007] A spiral welding method is used for welding a spiral pipe, wherein the spiral pipe has a joint seam extending in a spiral shape, and the welding method comprises the following steps:

[0008] The spiral tube is caused to move spirally along its own pitch;

[0009] Using an inner pressing wheel and an outer pressing wheel to apply pressure to the joint seam so that the joint seam is tightly joined, one of the inner pressing wheel and the outer pressing wheel is provided with a welding anode located on its peripheral wall, and the other is provided with a welding cathode located on its peripheral wall, and the joint seam is welded by the welding anode and the welding cathode;

[0010] During the welding process, at least one of the inner clamping wheel and the outer clamping wheel is controlled to actively rotate;

[0011] During the welding process, the spiral tube is pushed toward the inner clamping wheel and the outer clamping wheel to move spirally, so that the spiral tube moves spirally according to its own pitch.

[0012] Preferably, in the step of causing the spiral tube to move helically along its own pitch, a clamping force is applied to the spirally moving spiral tube.

[0013] Preferably, before the step of causing the spiral tube to move helically along its own pitch, a support member is provided inside the spiral tube, the support member is in contact with the inner wall of the spiral tube and can rotate actively.

[0014] Preferably, during the welding of the joint seam, the inner clamping wheel is cooled by a coolant.

[0015] Preferably, an electrode ring is arranged along the circumference of the outer clamping wheel, the electrode ring is composed of at least two unit bodies connected end to end, and a welding anode or a welding cathode is arranged on the circumferential wall of each unit body;

[0016] During the welding process, the outer pressing wheel is rotated so that each of the unit bodies is in contact with the surface of the spiral tube respectively.

[0017] Preferably, the outer pressing wheel is located outside the spiral tube;

[0018] During the welding process, the outer clamping wheel is actively rotated to drive the spiral tube to move spirally along its own pitch.

[0019] Preferably, the inner pressing wheel is located inside the spiral tube;

[0020] During the welding process, the central axis of the inner pressure wheel is made parallel to or coincides with the central axis of the spiral tube.

[0021] Preferably, the inner pressure wheel is arranged as a driving wheel so that the inner pressure wheel can actively rotate.

[0022] Preferably, the central axis of the outer pressure wheel is made to intersect with the central axis of the spiral tube, and the outer pressure wheel is arranged as a driving wheel so that the outer pressure wheel can roll relative to the spiral tube along the joint seam.

[0023] Preferably, before the step of causing the spiral tube to move helically along its own pitch, at least one conveyor belt is spirally wound around the spiral tube, and the pitch of the spirally wound conveyor belt is not less than the pitch of the spiral tube, so that the spiral tube can be driven to move helically by the conveyor belt;

[0024] The conveyor belt is wound around the upstream side of the spiral tube, and the inner pinch wheel and the outer pinch wheel are arranged on the downstream side of the spiral tube.

[0025] The present invention has the following advantages and beneficial effects:

[0026] The present invention proposes a novel spiral welding method, which optimizes the welding process by making the spiral tube move spirally along its own pitch. During the welding process, the spiral tube is pushed toward the inner clamping wheel and the outer clamping wheel, which ensures the tight connection of the joint during welding. Specifically, the welding anode and the welding cathode are supplied with current to effectively weld the compressed welding part.

[0027] During this process, at least one of the inner and outer clamping wheels actively rotates, driving the spiral tube to move along the pitch. At the same time, the inner and outer clamping wheels apply pressure to the joint seam to form a dynamic fixed point. When the spiral tube is pushed, another dynamic fixed point is also generated at the pushing position. The two dynamic clamping points work together to ensure that the spiral tube maintains a good fit in the axial direction, which helps to improve the welding quality and reduce the problem of reduced welding quality caused by axial stretching of the spiral tube.

[0028] This welding method not only enhances the stability of the welding process, but also improves the overall quality of the welding part. By adopting this method, the welding process of spiral pipe fittings is simplified, the operation is more convenient, and the production cost is reduced, which is suitable for large-scale production. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 It is a schematic diagram of the structure of the cooperation between the inner and outer clamping wheels and the spiral tube in the embodiment of the present application;

[0031] Figure 2 This is a first structural schematic diagram of the cooperation between the inner and outer clamping wheels in the embodiment of the present application;

[0032] Figure 3 This is a second structural schematic diagram of the cooperation between the inner and outer clamping wheels in the embodiment of the present application;

[0033] Figure 4 It is a schematic diagram of the structure of the inner clamping wheel and the joint seam in the embodiment of the present application;

[0034] Figure 5 It is a schematic diagram of the structure of a spiral tube.

[0035] The markings in the figure are:

[0036] 10. spiral tube; 11. joint seam; 100. inner clamping wheel; 200. outer clamping wheel; 210. electrode ring; 211. unit body; 300. support member; 400. conveyor belt. DETAILED DESCRIPTION

[0037] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0038] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0039] In the process of industrial production, in order to avoid environmental pollution, filtering equipment is needed to treat industrial waste gas or industrial wastewater. Among them, tubular filter element is one of the important components of commonly used industrial filtering equipment. Tubular filter element is usually composed of an outer filter membrane and an inner support body.

[0040] The related art discloses a rigid tube blank and its skeleton structure, including a spiral frame, and the cross section of the frame includes a first bending portion, a straight portion, and a second bending portion arranged in sequence along the connection direction. In application, the frame will be used in conjunction with the functional body. When the frame is used in conjunction with the functional body, one side of the functional body is connected to the first bending portion, and the other side is connected to the second bending portion. By welding the connection between the functional body and the first bending portion and the second bending portion, a spiral pipe structure is finally formed. Among them, the functional body can be a metal plate or a metal filter screen. For example, the frame is used in conjunction with the filter screen to form a metal spiral tubular filter screen.

[0041] However, when welding the connection between the functional body and the first bend and the second bend, the spiral frame may be stretched in its axial direction. This stretching will cause relative displacement between the frame and the functional body, thereby affecting the accuracy and overall performance of the spiral tube after welding. The reason why the spiral frame is stretched in the axial direction is that during the welding process, the driving device drives the spiral tube to move so that it is welded while moving. During this driving process, the spiral shape of the spiral tube will be stretched, resulting in a change in relative position, thereby affecting the welding quality.

[0042] In order to solve the above problems, the present application provides a spiral welding method, during which at least one of the inner and outer clamping wheels actively rotates to drive the spiral tube to move along the pitch. At the same time, the inner and outer clamping wheels apply pressure to the joint seam to form a dynamic fixed point. When the spiral tube is pushed, another dynamic fixed point is also generated at the pushing position. The two dynamic clamping points work together to ensure that the spiral tube maintains a good fit in the axial direction, thereby helping to improve the welding quality and reduce the problem of reduced welding quality due to axial stretching of the spiral tube.

[0043] Combine the following Figures 1 to 5 A tubular structure spiral stroke cyclic rolling mechanism provided in an embodiment of the present application is described in detail through specific embodiments and application scenarios.

[0044] The embodiment of the present application provides a spiral welding method suitable for welding a spiral pipe 10 having a spiral joint 11 (see Figure 5 Specifically, the spiral tube 10 is formed by spirally rolling a spiral strip, wherein the spiral strip can be a single strip or a plurality of strips spliced ​​in the width direction. The specific structure of the spiral strip can be adjusted according to actual needs, so there is no limitation on this.

[0045] The welding method comprises the following steps:

[0046] The spiral tube 10 is caused to move spirally along its own pitch;

[0047] The inner pressing wheel 100 and the outer pressing wheel 200 are used to apply pressure to the joint seam 11 so that the joint seam 11 is tightly joined. One of the inner pressing wheel 100 and the outer pressing wheel 200 is provided with a welding anode located on its peripheral wall, and the other is provided with a welding cathode located on its peripheral wall. The joint seam 11 is welded by the welding anode and the welding cathode.

[0048] During the welding process, at least one of the inner clamping wheel 100 and the outer clamping wheel 200 is controlled to rotate actively;

[0049] During the welding process, the spiral tube 10 is pushed toward the inner clamping wheel 100 and the outer clamping wheel 200 to move spirally, so that the spiral tube 10 moves spirally according to its own pitch.

[0050] In this embodiment, the spiral movement of the spiral tube 10 is achieved by an external driving device. Specifically, the driving device moves the spiral tube 10 along its pitch, that is, each movement of the spiral tube 10 is in accordance with the spiral pitch of the spiral tube 10 itself, ensuring that the spiral tube 10 maintains a certain degree of synchronization with the welding part of the joint seam 11 during the welding process. Here, "spiral movement" means that the spiral tube 10 continuously moves around its axis in a manner consistent with its pitch, rather than simply linear advancement.

[0051] In some embodiments, the driving device can be designed as a belt structure (for example, Figure 1 and Figure 2 Specifically, the belt can be spirally wound around the spiral tube 10, and the spiral tube 10 can be pushed by friction or mechanical linkage with the spiral tube 10, so that the spiral tube 10 can move spirally along its pitch.

[0052] The spiral winding design of the belt matches the pitch of the spiral tube 10. When the spiral moves, the belt keeps in contact with the outer surface of the spiral tube 10 and applies a moderate force to move the spiral tube 10 at the same pitch. The continuous spiral push of the belt can achieve stable spiral movement, thereby improving the relative positioning accuracy of the spiral tube 10 and the joint seam 11 during the welding process.

[0053] In addition, the spirally wound belt structure is simple and flexible, and is suitable for spiral tubes 10 of different sizes or specifications, thereby helping to improve the applicability and operating efficiency of the entire welding process. In this design, the belt not only plays a driving role, but also disperses the stress of the spiral tube 10 during the movement process to a certain extent, further optimizing the welding quality.

[0054] In this embodiment, the inner pressing wheel 100 and the outer pressing wheel 200 are specifically designed as a rolling wheel structure. More specifically, the inner pressing wheel 100 and the outer pressing wheel 200 are both provided with a cylindrical peripheral wall, which can be in close contact with the outer surface of the spiral tube 10 .

[0055] The design of the rolling wheel helps to reduce frictional resistance during the welding process, allowing the spiral tube 10 to move spirally along its pitch more smoothly. At the same time, the contact area between the cylindrical surfaces of the inner clamping wheel 100 and the outer clamping wheel 200 and the spiral tube 10 is relatively uniform, and a continuous and stable clamping force can be applied to the spiral tube 10 without damaging the surface of the spiral tube 10. The purpose of this clamping force is to ensure that the spiral tube 10 remains in a fitted state during the welding process to avoid relative displacement or deformation during welding. By adopting a rollable wheel structure, the inner clamping wheel 100 and the outer clamping wheel 200 can effectively disperse the pressure applied to the spiral tube 10, thereby helping to improve the stability and welding quality of the joint seam 11 welding.

[0056] It is understandable that, referring to Figure 3 As shown, the specific structure of the joint seam 11 is an overlapping structure, that is, the joint seam 11 is composed of at least two layers of material. During the welding process, the inner pressure wheel 100 and the outer pressure wheel 200 can press the two or more layers together tightly by applying sufficient pressure. This overlapping structure is conducive to increasing the strength of the joint seam 11 and providing a good contact surface for the welding operation.

[0057] The specific function of the welding anode and the welding cathode is to be used as electrodes. In actual operation, the welding anode and the welding cathode are connected by a circuit so that current flows through the joint seam 11. Due to the thermal effect generated when the current passes through the joint seam 11, the material at the joint seam 11 is melted, thereby achieving welding. The basic principle of this welding method is similar to that of roll welding (it can also be regarded as welding achieved by using the principle of roll welding), that is, the effect of melting and connecting the materials is achieved by passing electricity and heating between the electrodes.

[0058] It is particularly important to note that the welding anode and the welding cathode are respectively arranged on the outer peripheral walls of the inner clamping wheel 100 and the outer clamping wheel 200. In this way, while the inner clamping wheel 100 and the outer clamping wheel 200 are clamping the joint seam 11, the electrodes can ensure that the current flows stably through the joint seam 11, thereby making the welding effect more uniform and reliable. Through this design, the welding process is more continuous and efficient, which helps to improve the welding quality and reduce the occurrence of welding defects.

[0059] In this embodiment, controlling at least one of the inner pinch wheel 100 and the outer pinch wheel 200 to actively rotate means connecting the inner pinch wheel 100 and / or the outer pinch wheel 200 through a driving device to directly drive them to rotate. This configuration allows at least one of the inner pinch wheel 100 and the outer pinch wheel 200 to generate relative movement or a tendency to relative movement with the clamped portion during the welding process.

[0060] During the welding process, when the material is in a heated and molten state, the relative movement of the inner clamping wheel 100 and the outer clamping wheel 200 can exert a rolling effect on the joint. This rolling not only ensures the fit of two or more layers of material, but also effectively avoids gaps or irregular bonding of the welding materials by applying uniform pressure in the molten state, thereby greatly improving the welding quality. This structural design provides a guarantee for a stable welding effect, while reducing the stress and deformation problems that may occur during the welding process, thereby improving production efficiency and the reliability of welding quality to a certain extent.

[0061] During the welding process, the spiral tube 10 is pushed to move spirally toward the inner pinch wheel 100 and the outer pinch wheel 200, which means that the axial force applied to the spiral tube 10 during welding keeps it stable on the upstream side of the inner pinch wheel 100 and the outer pinch wheel 200. This design can effectively prevent the problem of reduced welding quality due to spiral stretching. In this way, the spiral tube 10 is always in an ideal fit during welding, thereby improving the overall quality of welding.

[0062] Specifically, during the welding process, on the one hand, the inner clamping wheel 100 and the outer clamping wheel 200 apply pressure to the joint seam 11 to form a dynamic fixed point. On the other hand, in the process of pushing the spiral tube 10 to the inner clamping wheel 100 and the outer clamping wheel 200, another dynamic fixed point is also formed at the pushing position. The synergistic effect of these two dynamic fixed points effectively prevents the spiral tube 10 from stretching in the axial direction, maintains a good fit, and ensures the welding quality.

[0063] According to an optional embodiment, during the process of making the spiral tube 10 move helically along its own pitch, a clamping force is applied to the spiral tube 10. Specifically, the clamping force is applied in the radial direction of the spiral tube 10, which helps to maintain a constant outer diameter of the spiral tube 10 in the circumferential direction. In this way, quality problems caused by deformation during the welding process can be effectively prevented, thereby improving the overall quality of the welded product.

[0064] In an exemplary embodiment, the holding force can be provided by a ribbon structure helically wrapped around the helical tube 10 (see Figure 1 and Figure 2 , wherein the conveyor belt 400 can be regarded as a belt structure). During use, the belt structure is spirally wound around the outside of the spiral tube 10. Through the transmission of the belt structure, not only can the spiral tube 10 be driven to move spirally along its own pitch, but also a clamping force can be applied to the spiral tube 10 to maintain its stable outer diameter. This configuration effectively improves the overall quality of the welding process and avoids potential problems caused by deformation.

[0065] According to an alternative embodiment, referring to Figure 1 , Figure 2 As shown, before the spiral tube 10 is spirally moved along its own pitch, a support member 300 can be arranged inside the spiral tube 10. The support member 300 is in contact with the inner wall of the spiral tube 10 and has the ability to actively rotate. Among them, the support member 300 has a cylindrical surface, which is in close contact with the inner wall of the spiral tube 10, thereby providing a radial support effect, and working together with the clamping force applied to the outside of the spiral tube 10 to further improve the welding quality. The active rotation of the support member 300 is achieved by a driving structure connected thereto, so that it can rotate around the central axis. Through the rotation of the support member 300, the uniformity of stress distribution can be effectively achieved, thereby improving the overall welding performance.

[0066] According to an optional embodiment, during the welding process of the joint seam 11, the inner pinch wheel 100 is cooled by a coolant. Specifically, a cooling channel is provided in the inner pinch wheel 100, and the coolant circulates in the channel, thereby effectively reducing the temperature of the inner pinch wheel 100. It should be understood that the coolant can be a non-conductive coolant to avoid the current interfering with the welding process.

[0067] During the welding process, due to the high temperature of the welding area, the temperature of the inner pressure wheel 100 will also rise when it contacts the welding part. If the temperature of the inner pressure wheel 100 is too high, it may cause its material properties to decline, affect the clamping effect, and even pose a potential risk of use. Therefore, by setting a cooling channel and using coolant for circulating cooling, the temperature of the inner pressure wheel 100 can be reduced to a certain extent to maintain its normal working state. In this way, the inner pressure wheel 100 can not only maintain its clamping function for a longer time, but also help to improve the stability and quality of the welding process.

[0068] It should be noted that when selecting a coolant, a non-conductive coolant helps to avoid short circuits or interference during welding, thereby benefiting the safety and service life of the welding equipment. This cooling design optimizes the welding environment by controlling the temperature of the inner clamping wheel 100, allowing the welding part to be carried out under relatively stable conditions, ultimately helping to improve the quality and effect of welding.

[0069] According to an alternative embodiment, referring to Figure 1 , Figure 2As shown, an electrode ring 210 is arranged along the circumference of the outer clamping wheel 200, and the electrode ring 210 is composed of at least two unit bodies 211 connected end to end, and the peripheral wall of each unit body 211 is provided with a welding anode or a welding cathode. During the welding process, the outer clamping wheel 200 is rotated so that each unit body 211 contacts the surface of the spiral tube 10 respectively. During specific use, the outer clamping wheel 200 is actively rotated so that each unit body 211 contacts the surface of the spiral tube 10 in turn. Whenever the unit body 211 contacts the spiral tube 10, the electrode generates welding heat through the current between the anode and the cathode, thereby realizing continuous welding of the splicing seam 11.

[0070] The design of the electrode ring 210 can ensure contact stability and welding efficiency during welding. Because the electrode ring 210 is composed of multiple unit bodies 211, when the outer clamping wheel 200 rotates, each unit body 211 can contact the outer surface of the spiral tube 10 in turn, ensuring that the welding part is always in a heated state, which is conducive to the hot melt bonding of the welding material. In addition, this segmented electrode ring 210 structure can also reduce the local wear of the electrode during welding to a certain extent, and extend the service life of the electrode.

[0071] At the same time, the segmented design of the electrode ring 210 helps to reduce the contact area of ​​each welding, so that the magnitude of the welding current and the distribution of heat can be more accurately controlled. This structure optimizes the stability of the welding process and helps to improve the accuracy and overall performance of the spiral tube 10 after welding.

[0072] It should be understood that each unit body 211 contacts the spiral tube 10 in turn during the welding process, and this alternating contact method allows the unit body 211 that is not in contact with the spiral tube 10 to have a certain amount of time to cool down in the contact gap. Since the electrode will generate high temperature during welding, the design of alternating contact allows the unit body 211 of the electrode ring 210 to effectively dissipate heat, thereby avoiding the situation where the electrode continues to be at high temperature and causes performance degradation or damage.

[0073] In this way, the overall temperature of the electrode ring 210 can be kept within a reasonable range, which is beneficial to extending the service life of the electrode and reducing welding quality problems caused by overheating. At the same time, this design can also reduce the dependence on the external cooling system, simplify the equipment structure to a certain extent, and improve the reliability of the welding operation.

[0074] According to an optional embodiment, the outer pinch wheel 200 is located outside the spiral tube 10. During the welding process, the spiral tube 10 is driven to move spirally along its own pitch through the active rotation of the outer pinch wheel 200. This structural design enables the spiral tube 10 to maintain a stable movement path during welding, avoiding the problem of reduced welding quality due to irregular movement.

[0075] Driven by the rotation of the external clamping wheel 200, the moving speed of the spiral tube 10 is consistent with its pitch, which not only helps to maintain the alignment of the joint seam 11 during welding, but also can prevent the spiral tube 10 from axial stretching or deformation to a certain extent, which is beneficial to improving the overall accuracy and strength after welding.

[0076] According to an optional embodiment, the inner clamping wheel 100 is located inside the spiral tube 10. During the welding process, the central axis of the inner clamping wheel 100 is parallel to or coincides with the central axis of the spiral tube 10. With this design, the inner clamping wheel 100 can provide stable support inside the spiral tube 10 and cooperate with the outer clamping wheel 200 to apply uniform pressure to the joint seam 11 of the spiral tube 10.

[0077] This structure helps to maintain the concentricity of the spiral tube 10 during welding, and avoids welding deviation or misalignment of the joint seam 11 caused by deformation of the tube body during welding. At the same time, the inner clamping wheel 100 fits the inner wall of the spiral tube 10, which can effectively prevent radial expansion or deformation of the spiral tube 10 during welding, which is beneficial to improving the welding quality and the precision and strength of the finished product.

[0078] According to an optional embodiment, the inner pinch wheel 100 is set as a driving wheel so that the inner pinch wheel 100 can rotate actively. During the welding process, the active rotation of the inner pinch wheel 100 can work in coordination with the outer pinch wheel 200, and the combined action of the inner pinch wheel 100 and the outer pinch wheel 200 pushes the spiral tube 10 to move spirally along its pitch.

[0079] By setting the inner pinch wheel 100 as a driving wheel, the stability of the spiral tube 10 during the welding process can be further improved, and the friction or uneven stretching generated when the spiral tube 10 moves can be reduced, which is beneficial to maintaining the accuracy of the shape and size of the spiral tube 10. The active rotation of the inner pinch wheel 100 can also make it better fit the inner wall of the spiral tube 10, thereby providing more stable support during the welding process, ensuring that the joint seam 11 maintains a precise position during welding, and further improving the welding quality and the structural strength after welding.

[0080] In some embodiments, reference Figure 2 As shown, the inner pinch wheel 100 is connected to the support member 300, that is, the inner pinch wheel 100 rotates synchronously with the support member 300. Specifically, the connection between the inner pinch wheel 100 and the support member 300 can be achieved through a mechanical structure, thereby ensuring that the two maintain synchronous movement during the welding process. The support member 300 can provide a structural basis for the installation of the inner pinch wheel 100, for example, by fixing it together through a bracket or other connecting parts, ensuring that the rotation of the inner pinch wheel 100 is stable and reliable.

[0081] It is understandable that the connection between the inner pressure wheel 100 and the support member 300 is not only for structural installation requirements, but also can be integrated into the design so that the inner pressure wheel 100 and the support member 300 can work together in function, further improving the stability and welding quality of the spiral tube 10. Through the stable support provided by the support member 300, the inner pressure wheel 100 can apply the pressing force more effectively, ensuring that the spiral tube 10 always maintains a suitable posture during the welding process, avoiding the welding effect being affected by unstable rotation or uneven force.

[0082] According to an alternative embodiment, referring to Figure 3 , Figure 4 As shown, the dotted line on the outer pinch wheel 200 represents the central axis of the outer pinch wheel 200, the dotted line on the inner pinch wheel 100 represents the central axis of the inner pinch wheel 100, and the dotted line on the spiral tube 10 represents the central axis of the spiral tube 10, so that the central axis of the outer pinch wheel 200 intersects with the central axis of the spiral tube 10, and the outer pinch wheel 200 is set as a driving wheel so that the outer pinch wheel 200 can roll along the joint seam 11 relative to the spiral tube 10. This design of the outer pinch wheel 200 ensures that during the welding process, the outer pinch wheel 200 can accurately apply pressure along the joint seam 11 to perform rolling and rolling welding. Since the central axis of the outer pinch wheel 200 intersects with the central axis of the spiral tube 10, and the central axis of the inner pinch wheel 100 is parallel to or coincides with the central axis of the spiral tube 10, the matching relationship between the inner pinch wheel 100 and the outer pinch wheel 200 is established, that is, the central axes of the inner pinch wheel 100 and the outer pinch wheel 200 also intersect.

[0083] Specifically, the outer pressing wheel 200 rolls along the direction of the joint seam 11, while the inner pressing wheel 100 rolls along the direction intersecting the joint seam 11. Under the coordinated action of the inner pressing wheel 100 and the outer pressing wheel 200, the deformation and extension tendency generated during the rolling process will be concentrated in the width direction of the joint seam 11, rather than along the length direction of the joint seam 11. This rolling method can make the joint seam 11 deform evenly in its width direction and reduce the risk of extension in the length direction.

[0084] This design helps to avoid excessive deformation accumulation of the joint 11 in the length direction. If the rolling action is concentrated in the length direction of the joint 11, the length of the joint 11 may gradually increase during welding. Since other areas except the joint 11 are not stretched, material accumulation or folding may occur at the joint 11, thereby affecting the welding quality and even hindering the smooth progress of welding. However, rolling along the width direction of the joint 11 is conducive to maintaining the stability of the joint 11 and further improving the welding quality.

[0085] According to an alternative embodiment, referring to Figure 1 , Figure 2 As shown, before the step of making the spiral tube 10 move spirally along its own pitch, at least one circle of conveyor belt 400 is spirally wound on the outside of the spiral tube 10, and the pitch of the spiral winding of the conveyor belt 400 is not less than the pitch of the spiral tube 10, and the spiral tube 10 can be driven to move spirally by the conveyor belt 400. The conveyor belt 400 is wound around the upstream side of the spiral tube 10, and the inner pressure wheel 100 and the outer pressure wheel 200 are arranged on the downstream side of the spiral tube 10. The spiral tube 10 can be driven to move spirally by the conveyor belt 400. Specifically, the conveyor belt 400 is wound around the upstream side of the spiral tube 10, and the inner pressure wheel 100 and the outer pressure wheel 200 are arranged on the downstream side of the spiral tube 10. Such a layout design can ensure stability and accuracy during the welding process.

[0086] By wrapping the conveyor belt 400 on the upstream side of the spiral tube 10, continuous power can be provided for the movement of the spiral tube 10 before welding, ensuring that the spiral tube 10 moves smoothly according to the set pitch. At the same time, the inner clamping wheel 100 and the outer clamping wheel 200 are arranged on the downstream side to apply pressure to the joint seam 11, thereby effectively achieving the compression and forming of the welding part. The conveyor belt 400 cooperates with the inner clamping wheel 100 and the outer clamping wheel 200 to maintain the position stability of the spiral tube 10 during the welding process and prevent it from unnecessary displacement or stretching.

[0087] In addition, the pitch of the conveyor belt 400 is not less than the pitch of the spiral tube 10, and an appropriate axial compression force can be applied to the spiral tube 10 before welding to ensure that the spiral tube 10 maintains an axial compression state during welding, thereby reducing quality problems that occur during welding. This design helps to improve the accuracy and overall performance of the product after welding, and is beneficial to improving the stability and strength of the welded joint.

[0088] In some schemes, winding devices are respectively provided at the two free ends of the conveyor belt 400, wherein one free end of the conveyor belt 400 is wound around the winding device on one side, and the other free end is wound around the winding device on the other side. Through the coordinated work of the two winding devices, the conveyor belt 400 can effectively drive the spiral tube 10 to move spirally, and can also hold the spiral tube 10 tightly. Specifically, when one winding device is winding, the other winding device is in an unwinding state. After completing the production of a tubular structure, the system can reversely unwind, release the wound conveyor belt 400, and rewind it, thereby smoothly starting the next round of production process. This design improves the continuity and efficiency of production. In other embodiments, the arrangement of the conveyor belt 400 can take other shapes, such as forming a ring structure connected end to end.

[0089] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A spiral welding method for welding a spiral tube (10), wherein the spiral tube (10) has a splicing seam (11) extending in a spiral shape, characterized in that: The welding method comprises the following steps: causing the spiral tube (10) to move spirally along its own spiral pitch; Using an inner pressing wheel (100) and an outer pressing wheel (200) to apply pressure to the joint seam (11) so that the joint seam (11) is tightly joined, one of the inner pressing wheel (100) and the outer pressing wheel (200) is provided with a welding anode located on its peripheral wall, and the other is provided with a welding cathode located on its peripheral wall, and the joint seam (11) is welded by the welding anode and the welding cathode; During the welding process, at least one of the inner pressure wheel (100) and the outer pressure wheel (200) is controlled to actively rotate; During the welding process, the spiral tube (10) is pushed toward the inner clamping wheel (100) and the outer clamping wheel (200) to move spirally, and a belt structure spirally wound around the outside of the spiral tube (10) applies a clamping force to the spiral tube (10) that is moving spirally, so that the spiral tube (10) moves spirally according to its own pitch, thereby allowing the spiral tube (10) to maintain a fitted state in the axial direction.

2. A spiral welding method according to claim 1, characterized in that: Before the step of causing the spiral tube (10) to move spirally along its own pitch, a support member (300) is inserted into the interior of the spiral tube (10), wherein the support member (300) is in contact with the inner wall of the spiral tube (10) and is capable of actively rotating.

3. A spiral welding method according to claim 1, characterized in that: During the welding process of the joint seam (11), the inner clamping wheel (100) is cooled by a cooling liquid.

4. A spiral welding method according to claim 1 or 3, characterized in that: An electrode ring (210) is arranged along the circumference of the outer clamping wheel (200), the electrode ring (210) being composed of at least two unit bodies (211) connected end to end, and a welding anode or a welding cathode is arranged on the circumferential wall of each unit body (211); During the welding process, the outer clamping wheel (200) is rotated so that each of the unit bodies (211) is in contact with the surface of the spiral tube (10).

5. A spiral welding method according to claim 1, characterized in that: The outer pressing wheel (200) is located outside the spiral tube (10); During the welding process, the spiral tube (10) is driven to move spirally along its own thread pitch through the active rotation of the outer clamping wheel (200).

6. A spiral welding method according to claim 1 or 5, characterized in that: The inner pressing wheel (100) is located inside the spiral tube (10); During the welding process, the central axis of the inner pressure wheel (100) is made parallel to or coincident with the central axis of the spiral tube (10).

7. A spiral welding method according to claim 6, characterized in that: The inner pressure wheel (100) is arranged as a driving wheel, so that the inner pressure wheel (100) can actively rotate.

8. A spiral welding method according to claim 1 or 7, characterized in that: The central axis of the outer pressure wheel (200) is made to intersect with the central axis of the spiral tube (10), and the outer pressure wheel (200) is arranged as a driving wheel, so that the outer pressure wheel (200) can roll relative to the spiral tube (10) along the joint seam (11).

9. A spiral welding method according to claim 1, characterized in that: Before the step of causing the spiral tube (10) to move helically along its own pitch, at least one turn of a conveyor belt (400) is spirally wound around the outside of the spiral tube (10), and the pitch of the spirally wound conveyor belt (400) is not less than the pitch of the spiral tube (10), so that the spiral tube (10) can be driven to move helically by the conveyor belt (400); The conveyor belt (400) is wound around the upstream side of the spiral tube (10), and the inner pressure wheel (100) and the outer pressure wheel (200) are arranged on the downstream side of the spiral tube (10).

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