A sizing device for high frequency welded pipe forming

Abstract

The utility model relates to the technical field of pipe welding sizing technology, and disclose a kind of sizing device for high-frequency welded pipe forming, including shell, shell has the central hole for pipe body to pass through, the inner wall of central hole is rotatably installed with the multiple sizing rollers of circumferential uniform distribution, the roll surface of sizing roller is contacted with the surface of pipe body and axis is perpendicular to the axis of pipe body, the rotation shaft end between every two adjacent sizing rollers is connected by transmission member drive connection, and one of transmission member is driven by driving shaft and drives multiple sizing rollers synchronous same direction rotation.The utility model is through multiple sizing rollers circumferential uniform distribution along shell central hole, roll surface is attached to pipe body, adjacent sizing roller is driven by first bevel gear and second bevel gear meshing, single driving shaft can drive all sizing rollers synchronous same direction rotation, this design does not need additional driving source, reduces synchronous error, pipe diameter tolerance and ovality, while improving equipment integration, reduce floor area.

Description

Technical Field

[0001] This utility model relates to the field of welded pipe sizing technology, specifically a sizing device for high-frequency welded pipe forming. Background Technology

[0002] High-frequency welded pipe (HFW) is a straight-seam welded pipe made by instantly heating the edges of a formed steel strip to a molten state with a high-frequency current (≥70kHz), and then fusing the edge metal together under the action of extrusion rollers. Its characteristics include a narrow heat-affected zone, high speed, and no filler metal, resulting in high weld strength and good surface quality. It is widely used in building structures, low-pressure fluid transportation, automobiles, and furniture.

[0003] Sizing of high-frequency welded pipes is an essential process after welding. Currently, most welded pipe sizing methods use a set of vertical rollers to control ovality and a set of horizontal rollers to control diameter. However, this traditional method uses a split design, requiring two different drive sources, making it difficult to ensure synchronous operation. It also occupies a large area. Furthermore, the vertical and horizontal rollers can only apply pressure to local areas of the welded pipe, which can easily lead to blind spots in roller pressure, resulting in indentations and uneven wall thickness on the surface of the welded pipe. Therefore, a new type of sizing device needs to be designed to solve the above problems. Utility Model Content

[0004] To address the technical problems existing in the background art, this utility model proposes a sizing device for high-frequency welded pipe forming.

[0005] This utility model proposes a sizing device for high-frequency welded pipe forming, including a housing with a central hole through which the welded pipe body passes. Multiple sizing rollers are rotatably mounted on the inner wall of the central hole, evenly distributed around the circumference. The roller surface of the sizing rollers is in contact with the surface of the welded pipe body and the axis is perpendicular to the axis of the welded pipe body. The rotating shaft ends of every two adjacent sizing rollers are connected by a transmission component, and one of the transmission components is driven by a drive shaft to drive the multiple sizing rollers to rotate synchronously in the same direction.

[0006] Preferably, the transmission component includes a first bevel gear and a second bevel gear. The first bevel gear is installed at both ends of the shaft of the sizing roller, and the second bevel gear is rotatably installed in the housing through a gear shaft and located between two adjacent sizing rollers. The second bevel gear meshes with the adjacent first bevel gear for transmission.

[0007] Preferably, the drive shaft is rotatably mounted on the outer wall of the housing, one end of the drive shaft extends into the housing and is connected to the gear shaft of one of the second bevel gears via a coupling, and the other end of the drive shaft is driven by a driver to rotate the second bevel gear.

[0008] Preferably, the housing contains multiple supports evenly distributed circumferentially and corresponding one-to-one with multiple sizing rollers. Each support includes two fixed arms symmetrically distributed on both ends of the sizing rollers. The two ends of the sizing roller's shaft are rotatably connected to the adjacent fixed arms via bearings.

[0009] Preferably, the housing is an annular shell with one end face set as an opening and covered by a removable end cap. The inner annular wall of the housing has a movable groove for the sizing roller to extend to the central hole, and the groove opening faces the opening of the housing.

[0010] Preferably, the device further includes a base, and the number of housings is multiple and evenly distributed along the length of the base. The sizing rollers inside adjacent housings are staggered to achieve circumferential coverage and rolling of the welded pipe body surface.

[0011] Preferably, a drive wheel is installed at one end of the drive shaft outside the housing, and two adjacent drive wheels are connected by a chain drive or belt drive structure to achieve synchronous rotation in the same direction.

[0012] The sizing device for high-frequency welded pipe forming proposed in this utility model has the following beneficial effects:

[0013] (i) Through the integrated design of “circumferentially distributed sizing rollers + bevel gear linkage”, single-drive full roller synchronization is achieved. Multiple sizing rollers are evenly distributed circumferentially along the central hole of the shell, and the roller surface is in contact with the welded pipe body. Adjacent sizing rollers are driven by the meshing of the first bevel gear and the second bevel gear. A single drive shaft can drive all sizing rollers to rotate synchronously in the same direction. This design does not require an additional drive source, reduces synchronization error, welded pipe diameter tolerance and ellipticity, while improving equipment integration, reducing floor space, and adapting to compact workshop layout. It is especially suitable for the capacity upgrade needs of small and medium-sized welded pipe enterprises.

[0014] (ii) By using circumferentially distributed sizing rollers, and in conjunction with the staggered distribution of sizing rollers in adjacent housings, the circumferential coverage of the welded pipe surface is achieved by roller pressing. Each sizing roller is in close contact with the welded pipe surface, and the roller pressing force is evenly distributed, avoiding pipe deformation caused by local stress concentration. It can also reduce the surface roughness and wall thickness deviation of the welded pipe, while improving the tensile strength of the weld area, fully meeting the stringent requirements for surface quality and structural strength of low-pressure fluid transportation, automotive pipes, etc.

[0015] (III) Multiple housings are evenly distributed along the length of the base. The drive shafts of adjacent housings are connected to the chain / belt drive through the transmission wheel to realize the synchronous linkage of multiple sizing rollers. This series design can continuously sizing long welded pipes in segments, avoiding the problem of incomplete sizing caused by the short roller pressing stroke of traditional single-set devices. At the same time, the staggered sizing rollers can perform multiple fine roller pressings on the welded pipe to further correct the diameter deviation and roundness, reduce the error of the overall dimensional consistency of the welded pipe, and adapt to the large-scale welded pipe mass production scenario.

[0016] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] Figure 1 This is a front structural diagram of the present invention;

[0018] Figure 2 This is a schematic diagram of the internal structure of the housing of this utility model;

[0019] Figure 3 This is a side view of the present invention.

[0020] Figure descriptions: 1. Shell; 2. Welded pipe body; 3. Sizing roller; 4. Support; 5. First bevel gear; 6. Second bevel gear; 7. Drive shaft; 8. Transmission wheel; 9. End cover; 10. Base. Detailed Implementation

[0021] The embodiments of this utility model are described in detail below. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar symbols denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0022] Please see Figures 1-3 A sizing device for high-frequency welded pipe forming includes a housing 1 with a central hole through which a welded pipe body 2 passes. Multiple sizing rollers 3 are rotatably mounted on the inner wall of the central hole and are evenly distributed around the circumference. The roller surface of the sizing rollers 3 is in contact with the surface of the welded pipe body 2 and the axis is perpendicular to the axis of the welded pipe body 2. The rotating shaft ends of every two adjacent sizing rollers 3 are connected by a transmission component, and one of the transmission components is driven by a drive shaft 7 to drive the multiple sizing rollers 3 to rotate synchronously in the same direction.

[0023] Addressing the issues of poor synchronization and large footprint of traditional sizing devices with dual drive sources, this device achieves a breakthrough through "single drive + multi-roller linkage." Multiple sizing rollers 3 are evenly distributed circumferentially along the central hole, with their surfaces in contact with the welded pipe body 2. Adjacent sizing rollers are linked through transmission components, requiring only a single drive shaft 7 to drive all sizing rollers to rotate synchronously and in the same direction. The axis of the sizing rollers is perpendicular to the axis of the welded pipe, ensuring that the roller pressure direction is accurately applied to the radial direction of the welded pipe, reducing the diameter tolerance and ellipticity of the welded pipe, improving the integration of the equipment, thereby reducing the floor space required and adapting to a compact workshop layout. At the same time, it reduces drive energy consumption and lowers production costs.

[0024] Specifically, the transmission components include a first bevel gear 5 and a second bevel gear 6. The first bevel gear 5 is installed at both ends of the rotating shaft of the sizing roller 3. The second bevel gear 6 is rotatably installed in the housing 1 through the gear shaft and is located between two adjacent sizing rollers 3. The second bevel gear 6 meshes with the adjacent first bevel gear 5 for transmission.

[0025] Bevel gear transmission enables vertical power transmission and is compatible with the circumferentially distributed spatial layout of sizing rollers. The first bevel gear at both ends of each sizing roller shaft precisely meshes with the second bevel gear on both sides, ensuring that power is evenly transmitted to all sizing rollers and avoiding jamming on one side. The bevel gears are made of 20CrMnTi material, with surface carburizing and quenching, which has excellent wear resistance, can extend service life, and reduce transmission failure rate.

[0026] Specifically, such as Figure 2 As shown, the drive shaft 7 is rotatably mounted on the outer wall of the housing 1. One end of the drive shaft 7 extends into the housing 1 and is connected to the gear shaft of one of the second bevel gears 6 via a coupling. The other end of the drive shaft 7 is driven by a driver to rotate the second bevel gear 6.

[0027] The drive shaft 7 is rotatably connected to the outer wall of the housing via bearings, ensuring no radial offset during high-speed rotation. The coupling adopts a flexible pin type, which can compensate for the installation error of the gear shaft and the drive shaft and avoid component damage caused by rigid connection. The driver can be a servo motor with adjustable speed to ensure continuous and uninterrupted sizing of the welded pipe.

[0028] Furthermore, such as Figure 2 As shown, multiple supports 4 are installed inside the housing 1. The multiple supports 4 are evenly distributed around the periphery and correspond one-to-one with multiple sizing rollers 3. Each support 4 includes two fixed arms symmetrically distributed on both ends of the sizing roller 3. The two ends of the rotating shaft of the sizing roller 3 are rotatably connected to the adjacent fixed arms through bearings.

[0029] Support 4 provides stable support for the sizing roller. The symmetrical distribution of the fixed arms ensures that the sizing roller is subjected to balanced force. The rotating shaft and the fixed arms are connected by deep groove ball bearings, so the sizing roller can rotate flexibly without jamming. The rolling accuracy does not decrease after long-term use. The circumferential distribution design of the support ensures that the force exerted by the sizing roller on the welded pipe is evenly distributed, avoiding deformation of the welded pipe caused by local stress concentration.

[0030] Specifically, such as Figure 1 and Figure 2 As shown, the housing 1 is an annular shell with one end face set as an opening and covered by a detachable end cap 9. The inner annular wall of the housing 1 is provided with a movable groove for the sizing roller 3 to extend to the central hole, and the groove opening faces the opening of the housing 1.

[0031] The annular housing 1 has a compact structure with an opening on one side for easy installation and adjustment of the sizing roller. The end cover 9 is bolted together. After the end cover 9 is opened, the internal parts of the housing 1 can be replaced and maintained. The movable groove provides rotation space for the sizing roller and also ensures that the sizing roller always fits the surface of the welded pipe during the rolling process.

[0032] Specifically, such as Figure 3 As shown, the device also includes a base 10, and the number of housings 1 is multiple and evenly distributed along the length of the base 10. The sizing rollers 3 inside two adjacent housings 1 are staggered to achieve circumferential coverage and rolling of the surface of the welded pipe body 2.

[0033] The base 10 provides fixed support for multiple housings, ensuring the coaxiality of the housings. Multiple housings are evenly distributed along the base, which can continuously and segmentally sizing long welded pipes, avoiding the problem of incomplete sizing in traditional single-set devices. The sizing rollers of adjacent housings are staggered, such as the sizing rollers of the previous housing at 0° / 90° / 180° / 270°, and the sizing rollers of the next housing at 45° / 135° / 225° / 315°, to achieve full circumferential coverage of the welded pipe with roller pressing, which helps to reduce surface roughness and wall thickness deviation.

[0034] Furthermore, a drive wheel 8 is installed at one end of the drive shaft 7 located outside the housing 1. Two adjacent drive wheels 8 are connected by a chain drive or belt drive structure to achieve synchronous rotation in the same direction.

[0035] The drive wheel 8 is selected as a sprocket or synchronous belt pulley to ensure that the drive shafts of adjacent shells rotate synchronously. Chain drive is suitable for high load scenarios, such as sizing of thick-walled welded pipes. Belt drive is smooth and low noise, suitable for sizing of thin-walled welded pipes. The transmission structure can realize synchronous linkage of sizing rollers in multiple shells, reduce the uniformity of the overall length of welded pipes, and meet the needs of large-scale mass production.

[0036] It should be noted that the end of the drive shaft 7 located outside the housing 1 is long enough to create a gap between the chain or timing belt and the outer wall of the housing 1, thus avoiding operational interference.

[0037] In summary, the sizing device provided in this application requires only a single drive source for the entire process, resulting in low energy consumption and good synchronization. Furthermore, through modular design and full-circumferential roll pressing, it balances sizing accuracy and production efficiency, fully meeting the stringent requirements of high-frequency welded pipes for surface quality, dimensional accuracy, and structural strength.

[0038] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0039] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A sizing device for high-frequency pipe welding forming, comprising a housing (1) having a central hole through which a pipe body (2) is passed, characterized in that, Multiple sizing rollers (3) are rotatably mounted on the inner wall of the central hole. The roller surface of the sizing rollers (3) is in contact with the surface of the welded pipe body (2) and the axis is perpendicular to the axis of the welded pipe body (2). The rotating shaft ends of each pair of adjacent sizing rollers (3) are connected by a transmission component, and one of the transmission components is driven by a drive shaft (7) to drive multiple sizing rollers (3) to rotate synchronously in the same direction.

2. A sizing device for high-frequency pipe welding forming according to claim 1, characterized in that, The transmission components include a first bevel gear (5) and a second bevel gear (6). The first bevel gear (5) is installed at both ends of the shaft of the sizing roller (3). The second bevel gear (6) is rotatably installed in the housing (1) through the gear shaft and is located between two adjacent sizing rollers (3). The second bevel gear (6) meshes with the adjacent first bevel gear (5) for transmission.

3. A sizing device for high-frequency pipe welding forming according to claim 2, characterized in that, The drive shaft (7) is rotatably mounted on the outer wall of the housing (1). One end of the drive shaft (7) extends into the housing (1) and is connected to the gear shaft of one of the second bevel gears (6) via a coupling. The other end of the drive shaft (7) is driven by a driver to rotate the second bevel gear (6).

4. A sizing device for high-frequency pipe welding forming according to claim 1, characterized in that, The housing (1) is equipped with multiple supports (4). The multiple supports (4) are evenly distributed around the periphery and correspond one-to-one with multiple sizing rollers (3). Each support (4) includes two fixed arms symmetrically distributed on both sides of the sizing roller (3). The two ends of the rotating shaft of the sizing roller (3) are rotatably connected to the adjacent fixed arms through bearings.

5. A sizing device for high-frequency pipe welding forming according to claim 1, characterized in that, The housing (1) is an annular shell with one end face set as an opening and covered by a removable end cap (9). The inner annular wall of the housing (1) is provided with a movable groove for the sizing roller (3) to extend to the center hole, and the groove opening faces the opening of the housing (1).

6. A sizing device for high-frequency pipe welding forming according to any of claims 1-5, characterized in that, The device also includes a base (10), and the number of housings (1) is multiple and evenly distributed along the length of the base (10). The sizing rollers (3) inside two adjacent housings (1) are staggered to achieve circumferential coverage and rolling of the surface of the welded pipe body (2).

7. A sizing device for high-frequency pipe welding forming according to claim 6, characterized in that, The drive shaft (7) is equipped with a transmission wheel (8) at one end outside the housing (1). Two adjacent transmission wheels (8) are connected by a chain drive or belt drive structure to achieve synchronous rotation in the same direction.

Images