A full-size square welded pipe roll forming roller assembly, lower roller part and device

Abstract

The application discloses a full-specification square welded pipe rolling forming roller assembly, a lower roller part and a device, and the roller assembly comprises a first mounting base, a first roller shaft, a second roller shaft and a first drive, the first roller shaft is rotationally connected with the first mounting base, the second roller shaft is rotationally connected with the first roller shaft in a radial direction and is axially slidably connected with the first roller shaft, and the first drive is connected with the second roller shaft in an axial direction; the first roller shaft is connected with a first roller at an end thereof, the second roller shaft is connected with a second roller at an end thereof, and a recess for embedding the first roller is arranged in the middle of the second roller; the first drive drives the second roller shaft to move in the axial direction, so that the outer edge of the first roller and the outer edge of the second roller form a die shape for steel strip rolling forming. The beneficial effect is that the roller die which plays a key role in steel strip forming is arranged in a split structure, so that the same basic equipment can be used for a group of rough forming welded pipe rolling mills, and rough forming can be realized only by adjusting the relative distance of the die.

Description

Technical Field

[0001] This invention belongs to the field of metallurgical machinery and equipment technology, and particularly relates to a roll assembly for rolling forming of full-size square welded pipes, a lower roll section and a roll forming device, which reduces the cost of disassembling and assembling roll molds and is used for continuous and rapid production of full-size square welded pipes. Background Technology

[0002] Welded pipe, commonly known as welded pipe, is a type of pipe made by rolling and welding steel plates or strips. Smaller diameter welded pipes use straight seam welding, while larger diameter welded pipes mostly use spiral welding. Welded pipe products come in a wide variety of steel grades and specifications, with diverse performance requirements, all of which should be differentiated according to user requirements or working conditions. Large-diameter thick-walled square welded pipe, also known as cold-bent steel profile, is made from steel plates or strips as the base material, cold-bent, and then high-frequency welded. Large-diameter thick-walled square welded pipe has wide applications in many industries. Traditional production methods for large-diameter thick-walled square welded pipe include: 1) using steel plate blanks commensurate with the final product size, bending them using a bending machine, followed by rolling closure, lap welding, welding, and straightening to finally form a large-diameter thick-walled square welded pipe. The production efficiency of large-diameter square welded pipes using this method is low because the bending machine can only fold one side of the square welded pipe at a time, and only one pipe can be produced at a time. Furthermore, even after straightening and shaping, the various surfaces of the square welded pipe produced in this way will exhibit varying degrees of distortion and deformation, leading to an imbalance of internal stress and affecting the quality of the square welded pipe. 2) First, the steel strip is rolled, pressed, and welded into a round pipe, and then the round pipe is extruded into a square welded pipe. This method involves two production processes: rolling and pressing the round pipe into a square pipe. Its production process is complex, involves numerous pieces of equipment, and has high production costs. Furthermore, when extruding round tubes into square welded pipes, the high compressive strength of the round tubes results in significant mechanical energy consumption and low production efficiency. 3) The roll forming process uses strip steel as raw material for continuous production. The typical process involves strip uncoiling → double-sided deburring → rough forming → fine forming → welding → removal of internal and external weld beads → initial sizing → eddy current testing → heat treatment → sizing and straightening → polishing. Finally, the processed welded pipe is cut to a fixed length to obtain the finished welded pipe. The welded pipe rolling mill is a crucial piece of equipment in the rough and fine forming stages of welded pipe production. In existing technologies, when producing products of different pipe types and specifications, the original roll dies inside the outer frame of the welded pipe rolling mill need to be removed and new roll dies installed. The disadvantages are that different specifications of welded pipes require corresponding specifications of rolling dies for production. In order to maintain competitiveness, enterprises will also prepare some uncommon specifications of rolling dies. The number of rolling dies is large and the cost is high. Due to the heavy weight of the rolling dies, the disassembly and assembly of the rolling dies is labor-intensive and time-consuming, and there are also certain safety hazards. In the later stage of the equipment, manual adjustment is required for each one. The automation level of the equipment is low, which seriously affects the production efficiency. During the commissioning stage, a large amount of production materials will be wasted. In addition, since the specifications of the rolling dies are not continuous, it is not possible to produce any size in the full range of specifications. Moreover, due to the limitation of the gradual deformation state of the steel strip roll, the existing rolling dies cannot produce very small square welded pipes. Summary of the Invention

[0003] 1. Technical problems to be solved

[0004] In existing technologies for continuous production of square welded pipes, there are several issues with the production process and equipment. Different specifications of welded pipes require corresponding roll dies, and to maintain competitiveness, companies often prepare dies for less common specifications. These dies are numerous and expensive. Furthermore, the heavy weight of the roll dies makes assembly and disassembly labor-intensive and time-consuming, posing safety hazards. Manual adjustments are required for each roll in the later stages of production, resulting in low automation and significantly impacting production efficiency. The commissioning phase also leads to substantial material waste. Additionally, the non-continuous specifications of the roll dies prevent the production of any size within the full range of specifications. Moreover, the limitations imposed by the gradual deformation of the steel strip during rolling prevent the production of very small square welded pipes. The purpose of this invention is to provide a roll forming mill for square welded pipes of all specifications. Based on the rolling deformation law of steel strip, the lower rolling mill assembly, lower rolling mill section, and device are designed with a split structure for the lower rolling mill mold, which plays a key role in steel strip forming. The split rolling mill mold is nested or separated by a drive mechanism. This is applicable to all stages of rough forming. A set of rough forming welded pipe rolling mills can use the same basic equipment and only need to adjust the relative distance of the molds to achieve rough forming. Each functional component adopts a modular design, with a precise structure that is easy to manufacture and assemble. The distance can be quickly and easily adjusted for precision. The equipment manufacturer can standardize and mass-produce modules of the same specification. The equipment purchaser can make precise adjustments within a single system according to the specifications of various square welded pipe products, saving on the purchase cost of molds and components, shortening installation and commissioning time, and achieving a high level of automation, saving manpower and improving equipment production efficiency.

[0005] 2. Technical Solution

[0006] To achieve the above objectives and technical effects, the present invention adopts the following technical solution:

[0007] A roll assembly for rolling forming of square welded pipes of all specifications is characterized by comprising a first mounting base, a first roll shaft, a second roll shaft, and a first drive. The first roll shaft is rotatably connected to the first mounting base, and the second roll shaft is radially synchronously rotated and axially slidably connected to the first roll shaft. The first drive is axially connected to the second roll shaft. A first roller is connected to the end of the first roll shaft, and a second roller is connected to the end of the second roll shaft. A groove for nesting the first roller is provided in the middle of the second roller. The first drive drives the second roll shaft to move in the axial direction, so that the outer edges of the first roller and the outer edges of the second roller form a mold shape for rolling forming of steel strip.

[0008] Furthermore, the first roll shaft is rotatably connected to the first mounting base via a first bearing and a first bearing housing. The first bearing is sleeved on the first roll shaft, and the first bearing housing is sleeved on the outside of the first bearing. The first bearing housing is connected to the first mounting base. A second bearing and a second bearing housing are sequentially arranged on the outside of the second roll shaft. The first drive includes a first mounting plate, a first servo motor, and a first worm gear reducer. The first mounting plate is connected to the first bearing housing, the first servo motor is connected to the first worm gear reducer, and the worm of the first worm gear reducer is connected to the second bearing housing in the axial direction.

[0009] Another objective of this invention is to provide a lower roll section for roll forming of full-size square welded pipes, characterized by comprising a first external spline shaft and the aforementioned roll forming assembly for full-size square welded pipes. Two roll forming assemblies are symmetrically arranged, namely a first lower roll assembly and a second lower roll assembly. The first external spline shaft is provided with an external spline; the first roll shaft is provided with an internal spline. Both ends of the first external spline shaft are slidably connected to the two first roll shafts via internal and external splines, respectively. When adjusting the distance, the first lower roll assembly and the second lower roll assembly move towards or away from each other. A torque connection end is provided at the end of the first roll shaft furthest from the first external spline shaft, connecting to a torque output device. During production, the first external spline shaft acts as a transmission component, causing the first roll shafts at both ends of the first external spline shaft to move synchronously.

[0010] Furthermore, the lower roll section for the full-size square welded pipe roll forming also includes a second external spline shaft and a first internal spline shaft. The second external spline shaft is provided with an external spline, and the first internal spline shaft is provided with an internal spline. The second external spline shaft and the first internal spline shaft are connected by the internal and external splines. When adjusting the distance, when the first lower roll assembly and the second lower roll assembly move towards or away from each other, the second external spline shaft and the first internal spline shaft slide relative to each other.

[0011] Another object of the present invention is to provide a roll forming apparatus for full-size square welded pipes, characterized by comprising a first frame, a second frame, an upper roll section, and the aforementioned lower roll section; the first frame and the second frame are symmetrically arranged on a base along the width direction of the strip; the upper roll section includes a first upper roll assembly, a second upper roll assembly, and a second drive; the first upper roll assembly includes a first upper roll shaft, a third bearing, a third bearing seat, a first sliding seat, a first turbine, and a first worm gear; the third bearing is sleeved on the first upper roll shaft, and the third bearing seat is sleeved on the outside of the third bearing; the third bearing seat is slidably connected to the first sliding seat; one end of the third bearing seat is threadedly connected to the first turbine gear; the first worm gear is connected to the first turbine gear; the second upper roll assembly includes a second upper roll shaft, The system comprises a fourth bearing, a fourth bearing housing, a second sliding seat, a second turbine, and a second worm gear. The fourth bearing is sleeved on the second upper roll shaft, and the fourth bearing housing is sleeved on the outside of the fourth bearing. The fourth bearing housing is slidably connected to the second sliding seat. One end of the fourth bearing housing is threadedly connected to the second turbine. The second worm gear is connected to the second turbine. The first and second upper roll assemblies are symmetrically arranged. The second drive connects the first and second worm gears to achieve synchronous movement. The first upper roll assembly is connected to the first frame via the first sliding seat. The second upper roll assembly is connected to the second frame via the second sliding seat. The first lower roll assembly is located on the first frame below the first upper roll assembly. The second lower roll assembly is located on the second frame below the second upper roll assembly.

[0012] Further, the second drive includes a second servo motor, a first worm gear reducer, a second worm gear reducer, and a first drive shaft; the output shaft of the first worm gear reducer is connected to a first worm, the input shaft of the first worm gear reducer is connected to the first drive shaft, the other end of the first drive shaft is connected to the second worm gear reducer, the second worm gear reducer is connected to the second servo motor; the first drive shaft includes a third external spline shaft and a third internal spline shaft, the third external spline shaft is provided with an external spline, the third internal spline shaft is provided with an internal spline, the third external spline shaft and the third internal spline shaft are connected by the external and internal splines, the third external spline shaft is connected to the first worm gear reducer; the third internal spline shaft is connected to the second worm gear reducer.

[0013] Furthermore, a fourth external spline shaft is provided between the first upper roll shaft and the second upper roll shaft, and the fourth external spline shaft is provided with external splines; both the first upper roll shaft and the second upper roll shaft are provided with internal splines, and the two ends of the fourth external spline shaft are slidably connected to the first upper roll shaft and the second upper roll shaft respectively through internal splines and external splines; when adjusting the distance, the first upper roll shaft and the second upper roll shaft move towards each other or away from each other; a torque connection end is provided at the end of the second upper roll shaft away from the fourth external spline shaft, which is connected to a torque output device. During production, the fourth external spline shaft acts as a transmission component, so that the first upper roll shaft and the second upper roll shaft at both ends move synchronously.

[0014] Furthermore, the full-size square welded pipe roll forming device also includes a lifting drive unit, which includes a first lifting worm gear reducer, a second lifting worm gear reducer, a third servo motor, and a second transmission shaft; the first lifting worm gear reducer is disposed on the upper part of the first frame, and the worm of the first lifting worm gear reducer passes through the upper part of the first frame and connects to the first sliding seat. The first frame and the first sliding seat are slidably connected in the vertical direction through a dovetail / dovetail groove connection structure; the second lifting worm gear reducer is disposed on the upper part of the second frame, and the second lifting worm gear reducer... The worm gear of the speed reducer passes through the upper part of the second frame and connects to the second sliding seat. The second frame and the second sliding seat are slidably connected in the vertical direction through a dovetail / dovetail groove connection structure. The second transmission shaft includes a fifth external spline shaft and a fifth internal spline shaft. The fifth external spline shaft is provided with an external spline, and the fifth internal spline shaft is provided with an internal spline. The fifth external spline shaft and the fifth internal spline shaft are connected by the internal and external splines. The fifth external spline shaft is connected to the first rising worm gear reducer. The fifth internal spline shaft is connected to the second rising worm gear reducer, and the second rising worm gear reducer is connected to the third servo motor.

[0015] Furthermore, the full-size square welded pipe roll forming device also includes an adjustment mechanism and a sliding fixing component. The first frame, the second frame and the base are slidably connected on both sides in the strip length direction through the sliding fixing component. The adjustment mechanism includes an adjustment screw, which is set along the strip width direction. The adjustment screw is rotatably connected to the base and threadedly connected to the first frame and the second frame.

[0016] Furthermore, the adjusting mechanism also includes a support base, a first threaded sleeve, a second threaded sleeve, and a drive motor; two support bases 43 are provided on the base in the width direction of the strip, with the two support bases located on one side of the first frame and the other side of the second frame, respectively; the adjusting screw is rotatably connected to the support base through a bearing; the first threaded sleeve is connected to the first frame; the second threaded sleeve is connected to the second frame; and the adjusting screw passes through the first threaded sleeve and the second threaded sleeve; one end of the adjusting screw is connected to the output shaft of the drive motor.

[0017] This invention provides a full-size square welded pipe roll forming device, employing a split first and second frame. The distance between the two frames can be adjusted in conjunction, facilitating operation and avoiding large-scale disassembly. The upper roll section adopts an adjustable-distance roll structure. When the thickness of the strip changes, a first drive mechanism adjusts the height and width of the first and second upper roll assemblies to meet production needs. Simultaneously, both the upper and lower roll sections are connected to torque output mechanisms, providing sufficient power to drive the strip forward and complete the roll forming. The first upper roll shaft, the second upper roll shaft, and the two first roll shafts are equipped with mold rollers for roll forming. Specifically, the lower roll... The rollers in this unit adopt a split structure. The first and second rollers can be nested and separated in the axial direction. Their edges constitute the various stages of the steel strip roll forming into square tubes. Through this split roller structure, multiple identical roll forming devices can be realized. By simply adjusting the relative positions of the first and second rollers according to the order of roll forming, a square welded pipe production line can be formed. The mold manufacturing cost is greatly reduced, and the device itself can also greatly shorten the order delivery cycle due to mass production. In addition, the split structure of the rollers allows the first and second rollers to be nested together as much as possible, which can be used to produce small-sized square welded pipes that cannot be produced by the integrated lower roller shaft.

[0018] 3. Beneficial effects

[0019] Compared with the prior art, the beneficial effects of this invention are as follows: Based on the law of steel strip rolling deformation, the lower roll shaft mold, which plays a key role in steel strip forming, is set as a split structure. For different specifications of square welded pipes, the size or rolling forming state can be precisely adjusted by nesting and separating the roller molds. It is applicable to all stages of the rough forming stage. A set of rough forming welded pipe rolling mills can use the same basic equipment. Only the relative distance of the molds needs to be adjusted to achieve rough forming. Each functional component adopts a modular design, which is precise in structure but easy to manufacture and assemble. The distance can be quickly and easily adjusted precisely. The equipment manufacturer can standardize and mass-produce each module of the same specification. The equipment purchaser can make precise adjustments within one system according to the specifications of various specifications of square welded pipe products. This saves the purchase cost of mold components, shortens the installation and commissioning time, has a high level of equipment automation, saves manpower, and improves equipment production efficiency. The roller adopts a split structure. The first roller and the second roller can be nested together as much as possible to produce small-specification square welded pipes that cannot be produced by the integrated lower roll shaft roller. Attached Figure Description

[0020] To more clearly illustrate the specific embodiments of the invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 This is a top view cross-sectional structural diagram of the lower roll section of the present invention.

[0022] Figure 2 This is a cross-sectional structural diagram of the full-size square welded pipe rolling forming device of the present invention.

[0023] In the diagram: 1-First mounting base; 2-First roll shaft; 3-Second roll shaft; 4-First roller; 5-Second roller; 6-First bearing; 7-First bearing housing; 8-Second bearing; 9-Second bearing housing; 10-First mounting plate; 11-First servo motor; 12-First worm gear reducer; 13-First external spline shaft; 14-Torque connection end; 15-Second external spline shaft; 16-First internal spline shaft; 17-First frame; 18-Second frame; 19-First upper roll shaft; 20-Third bearing; 21-Third bearing housing; 22-First sliding seat; 23-First worm gear; 24-First worm gear; 2 5-Second upper roll shaft; 26-Fourth bearing; 27-Fourth bearing housing; 28-Second sliding seat; 29-Second turbine; 30-Second worm gear; 31-Second servo motor; 32-First worm gear reducer; 33-Second worm gear reducer; 34-Fourth external spline shaft; 35-Third external spline shaft; 36-Third internal spline shaft; 37-First lifting worm gear reducer; 38-Second lifting worm gear reducer; 39-Third servo motor; 40-Fifth external spline shaft; 41-Fifth internal spline shaft; 42-Adjustable lead screw; 43-Support seat; 44-First threaded sleeve; 45-Second threaded sleeve; 46-Drive motor. Detailed Implementation

[0024] The technical solution of the invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the invention. Based on the embodiments of the invention, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of the invention.

[0025] In the description of the invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention.

[0026] In the description of the invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the invention based on the specific circumstances.

[0027] like Figure 1 , Figure 2 As shown, a full-size square welded pipe roll forming assembly is characterized by including a first mounting base 1, a first roll shaft 2, a second roll shaft 3, and a first drive. The first roll shaft 2 is rotatably connected to the first mounting base 1, and the second roll shaft 3 is radially synchronously rotated and axially slidably connected to the first roll shaft 2. The first drive is axially connected to the second roll shaft 3. The end of the first roll shaft 2 is connected to a first roller 4, and the end of the second roll shaft 3 is connected to a second roller 5. The second roller 5 has a groove in the middle for nesting the first roller 4. The first drive drives the second roll shaft 3 to move in the axial direction, so that the outer edge of the first roller 4 and the outer edge of the second roller 5 form a mold shape for steel strip roll forming.

[0028] The first roll shaft 2 is rotatably connected to the first mounting base 1 via the first bearing 6 and the first bearing seat 7. The first bearing 6 is sleeved on the first roll shaft 2, and the first bearing seat 7 is sleeved on the outside of the first bearing 6. The first bearing seat 7 is connected to the first mounting base 1. The second roll shaft 3 is sequentially provided with the second bearing 8 and the second bearing seat 9. The first drive includes the first mounting plate 10, the first servo motor 11, and the first worm gear reducer 12. The first mounting plate 10 is connected to the first bearing seat 7, the first servo motor 11 is connected to the first worm gear reducer 12, and the worm of the first worm gear reducer 12 is connected to the second bearing seat 9 in the axial direction.

[0029] A roll section for roll forming of full-size square welded pipe is characterized by including a first external spline shaft 13 and the aforementioned roll assembly for roll forming of full-size square welded pipe. Two roll assemblies for roll forming of full-size square welded pipe are symmetrically arranged, namely a first lower roll assembly and a second lower roll assembly. The first external spline shaft 13 is provided with an external spline. The first roll shaft 2 is provided with an internal spline. The two ends of the first external spline shaft 13 are slidably connected to the two first roll shafts 2 through the internal spline and external spline, respectively. When adjusting the distance, the first lower roll assembly and the second lower roll assembly move towards or away from each other. A torque connection end 14 is provided at the end of the first roll shaft 2 away from the first external spline shaft 13, which is connected to a torque output device. During production, the first external spline shaft 13 acts as a transmission component, causing the first roll shafts 2 at both ends of the first external spline shaft 13 to move synchronously.

[0030] The roll section for rolling full-size square welded pipe also includes a second external spline shaft 15 and a first internal spline shaft 16. The second external spline shaft 15 is provided with an external spline, and the first internal spline shaft 16 is provided with an internal spline. One end of the second external spline shaft 15 is connected to the first servo motor of the first lower roll assembly, and one end of the first internal spline shaft 16 is connected to the first servo motor of the second lower roll assembly. The second external spline shaft 15 and the first internal spline shaft 16 are connected by internal and external splines. When adjusting the distance, the second external spline shaft 15 and the first internal spline shaft 16 slide relative to each other when the first lower roll assembly and the second lower roll assembly move towards or away from each other.

[0031] like Figure 1 , Figure 2As shown, a full-size square welded pipe roll forming device is characterized by comprising a first frame 17, a second frame 18, an upper roll section, and the aforementioned lower roll section; the first frame 17 and the second frame 18 are symmetrically arranged on a base along the width direction of the strip; the upper roll section includes a first upper roll assembly, a second upper roll assembly, and a second drive; the first upper roll assembly includes a first upper roll shaft 19, a third bearing 20, a third bearing seat 21, a first sliding seat 22, a first turbine 23, and a first worm gear 24; the third bearing 20 is sleeved on the first upper roll shaft 19, and the third bearing seat 21 is sleeved on the outside of the third bearing 20; the third bearing seat 21 is slidably connected to the first sliding seat 22; one end of the third bearing seat 21 is threadedly connected to the first turbine 23; the first worm gear 24 is connected to the first turbine 23; the second upper roll assembly includes a second upper roll shaft 25 and a fourth bearing 26. 6. Fourth bearing housing 27, second sliding seat 28, second turbine 29, second worm gear 30; fourth bearing 26 is sleeved on the second upper roll shaft 25, and fourth bearing housing 27 is sleeved on the outside of fourth bearing 26; fourth bearing housing 27 is slidably connected to second sliding seat 28; one end of fourth bearing housing 27 is threadedly connected to second turbine 29; second worm gear 30 is connected to second turbine 29; first upper roll assembly and second upper roll assembly are symmetrically arranged; second drive connects first worm gear 24 and second worm gear 30 to achieve synchronous movement; first upper roll assembly is connected to first frame 17 through first sliding seat 22; second upper roll assembly is connected to second frame 18 through second sliding seat 28; first lower roll assembly is set on first frame 17 below first upper roll assembly; second lower roll assembly is set on second frame 18 below second upper roll assembly.

[0032] The second drive includes a second servo motor 31, a first worm gear reducer 32, a second worm gear reducer 33, and a first drive shaft. The output shaft of the first worm gear reducer 32 is connected to the first worm gear 24, the input shaft of the first worm gear reducer 32 is connected to the first drive shaft, the other end of the first drive shaft is connected to the second worm gear reducer 33, the second worm gear reducer 33 is connected to the second servo motor 31, and the first drive shaft includes a third external spline shaft 35 and a third internal spline shaft 36. The third external spline shaft 35 is provided with an external spline, and the third internal spline shaft 36 is provided with an internal spline. The third external spline shaft 35 and the third internal spline shaft 36 are connected by the external and internal splines. The third external spline shaft 35 is connected to the first worm gear reducer 32, and the third internal spline shaft 36 is connected to the second worm gear reducer 33.

[0033] A fourth external spline shaft 34 is provided between the first upper roll shaft 19 and the second upper roll shaft 25. The fourth external spline shaft 34 is provided with external splines. Both the first upper roll shaft 19 and the second upper roll shaft 25 are provided with internal splines. The two ends of the fourth external spline shaft 34 are slidably connected to the first upper roll shaft 19 and the second upper roll shaft 25 through internal splines and external splines, respectively. When adjusting the distance, the first upper roll shaft 19 and the second upper roll shaft 25 move towards or away from each other. A torque connection end 14 is provided at the end of the second upper roll shaft 25 away from the fourth external spline shaft 34, which is connected to a torque output device. During production, the fourth external spline shaft 34 serves as a transmission component, causing the first upper roll shaft 19 and the second upper roll shaft 25 at both ends to move synchronously.

[0034] The full-size square welded pipe roll forming device also includes a lifting drive unit, which includes a first lifting worm gear reducer 37, a second lifting worm gear reducer 38, a third servo motor 39, and a second drive shaft. The first lifting worm gear reducer 37 is located on the upper part of the first frame 17, and the worm of the first lifting worm gear reducer 37 passes through the upper part of the first frame 17 and connects to the first sliding seat 22. The first frame 17 and the first sliding seat 22 are slidably connected in the vertical direction through a dovetail / dovetail groove connection structure. The second lifting worm gear reducer 38 is located on the upper part of the second frame 18, and the worm of the second lifting worm gear reducer 38 passes through the first sliding seat 22. The upper part of the second frame 18 is connected to the second sliding seat 28. The second frame 18 and the second sliding seat 28 are slidably connected in the vertical direction through a dovetail / dovetail groove connection structure. The second transmission shaft includes a fifth external spline shaft 40 and a fifth internal spline shaft 41. The fifth external spline shaft 40 is provided with an external spline, and the fifth internal spline shaft 41 is provided with an internal spline. The fifth external spline shaft 40 and the fifth internal spline shaft 41 are connected by internal and external splines. The fifth external spline shaft 40 is connected to the first lifting worm gear reducer 37. The fifth internal spline shaft 41 is connected to the second lifting worm gear reducer 38. The second lifting worm gear reducer 38 is connected to the third servo motor 39.

[0035] The full-size square welded pipe roll forming device also includes a spacing adjustment mechanism and a sliding fixing component. The first frame 17 and the second frame 18 are slidably connected to the base on both sides in the strip length direction through the sliding fixing component. The spacing adjustment mechanism includes a spacing adjustment screw 42, which is set along the strip width direction. The spacing adjustment screw 42 is rotatably connected to the base and threadedly connected to the first frame 17 and the second frame 18.

[0036] The pitch adjustment mechanism also includes a support base 43, a first threaded sleeve 44, a second threaded sleeve 45, and a drive motor 46. Two support bases 43 are provided on the base in the width direction of the strip, and the two support bases 43 are respectively located on one side of the first frame 17 and the second frame 18. The pitch adjustment screw 42 is rotatably connected to the support base 43 through a bearing. The first threaded sleeve 44 is connected to the first frame 17, and the second threaded sleeve 45 is connected to the second frame 18. The pitch adjustment screw 42 passes through the first threaded sleeve 44 and the second threaded sleeve 45. One end of the pitch adjustment screw 42 is connected to the output shaft of the drive motor 46.

[0037] This invention provides a full-size square welded pipe roll forming device, employing a split first frame 17 and second frame 18. The distance between the two frames can be adjusted in conjunction, which is convenient and labor-saving, avoiding large-scale disassembly. The upper roll section adopts an adjustable-distance roll structure. When the thickness of the strip changes, the height and width of the first and second upper roll assemblies are adjusted using a first drive mechanism to meet production needs. At the same time, both the upper and lower roll sections are connected to torque output mechanisms to provide sufficient power to drive the strip forward and complete the roll forming. The first upper roll shaft 1, the second upper roll shaft 25, and the two first roll shafts 2 are equipped with mold rollers for roll forming. In particular, the lower roll... The rollers of the roller section adopt a split structure. The first roller 4 and the second roller 5 can be nested and separated in the axial direction. Their edges constitute the various stages of the steel strip roll forming into square tubes. Through this split roller structure, multiple identical roll forming devices can be formed by adjusting the relative positions of the first roller 4 and the second roller 5 according to the order of roll forming. This greatly reduces the mold manufacturing cost, and the device itself can also greatly shorten the order delivery cycle due to mass production. In addition, the rollers adopt a split structure, and the first roller 4 and the second roller 5 can be nested together as much as possible to produce small-sized square welded tubes that cannot be produced by the integrated lower roller shaft.

[0038] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "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.

[0039] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A roll assembly for roll forming of square welded pipes of all specifications, characterized in that: It includes a first mounting base (1), a first roll shaft (2), a second roll shaft (3), and a first drive. The first roll shaft (2) is rotatably connected to the first mounting base (1). The second roll shaft (3) is radially synchronously rotated and axially slidably connected to the first roll shaft (2). The first drive is axially connected to the second roll shaft (3). The end of the first roll shaft (2) is connected to a first roller (4), and the end of the second roll shaft (3) is connected to a second roller (5). The second roller (5) has a groove in the middle that is nested with the first roller (4). The outer edge of the first roller (4) and the outer edge of the second roller (5) form the mold shape for steel strip rolling.

2. The roll assembly for rolling a full-size square welded pipe according to claim 1, characterized in that: The first roll shaft (2) is rotatably connected to the first mounting base (1) via the first bearing (6) and the first bearing seat (7). The first bearing (6) is sleeved on the first roll shaft (2), and the first bearing seat (7) is sleeved on the outside of the first bearing (6). The first bearing seat (7) is connected to the first mounting base (1). The second roll shaft (3) is sequentially provided with the second bearing (8) and the second bearing seat (9). The first drive includes the first mounting plate (10), the first servo motor (11), and the first worm gear reducer (12). The first mounting plate (10) is connected to the first bearing seat (7), the first servo motor (11) is connected to the first worm gear reducer (12), and the worm of the first worm gear reducer (12) is connected to the second bearing seat (9) in the axial direction.

3. A lower roll section for roll forming of a full-size square welded pipe, characterized in that: The assembly includes a first external spline shaft (13) and a full-size square welded pipe roll forming assembly as described in claim 1 or 2. Two full-size square welded pipe roll forming assemblies are symmetrically arranged, namely a first lower roll assembly and a second lower roll assembly. The first external spline shaft (13) is provided with an external spline. The first roll shaft (2) is provided with an internal spline. The two ends of the first external spline shaft (13) are slidably connected to the two first roll shafts (2) through the internal spline and the external spline, respectively. When adjusting the distance, the first lower roll assembly and the second lower roll assembly move towards or away from each other. A torque connection end (14) is provided at the end of the first roll shaft (2) away from the first external spline shaft (13) to connect to a torque output device.

4. The lower roll section for roll forming of a full-size square welded pipe according to claim 3, characterized in that: The roll section of the full-size square welded pipe roll forming also includes a second external spline shaft (15) and a first internal spline shaft (16). The second external spline shaft (15) is provided with an external spline, and the first internal spline shaft (16) is provided with an internal spline. The second external spline shaft (15) and the first internal spline shaft (16) are connected by internal and external splines. When adjusting the distance, when the first lower roll assembly and the second lower roll assembly move towards or away from each other, the second external spline shaft (15) and the first internal spline shaft (16) slide relative to each other.

5. A roll forming device for full-size square welded pipes, characterized in that: The strip includes a first frame (17), a second frame (18), an upper roll section, and a lower roll section for roll forming of full-size square welded pipe as described in claim 4; the first frame (17) and the second frame (18) are symmetrically arranged on a base along the width direction of the strip; the upper roll section includes a first upper roll assembly, a second upper roll assembly, and a second drive; the first upper roll assembly includes a first upper roll shaft (19), a third bearing (20), a third bearing seat (21), a first sliding seat (22), and a first turbine (23). The first worm gear (24) is connected to the first upper roll shaft (19), and the third bearing (20) is sleeved on the outside of the third bearing (20). The third bearing seat (21) is slidably connected to the first sliding seat (22). One end of the third bearing seat (21) is threadedly connected to the first turbine (23). The first worm gear (24) is connected to the first turbine (23). The second upper roll assembly includes a second upper roll shaft (25), a fourth bearing (26), and a fourth bearing. The structure includes a seat (27), a second sliding seat (28), a second turbine (29), and a second worm gear (30). The fourth bearing (26) is sleeved on the second upper roll shaft (25), and the fourth bearing seat (27) is sleeved on the outside of the fourth bearing (26). The fourth bearing seat (27) is slidably connected to the second sliding seat (28). One end of the fourth bearing seat (27) is threadedly connected to the second turbine (29). The second worm gear (30) is connected to the second turbine (29). The first upper roll assembly and the second upper roll assembly are symmetrically arranged. The second drive connects the first worm gear (24) and the second worm gear (30) to achieve synchronous movement. The first upper roll assembly is connected to the first frame (17) through the first sliding seat (22). The second upper roll assembly is connected to the second frame (18) through the second sliding seat (28). The first lower roll assembly is set on the first frame (17) below the first upper roll assembly. The second lower roll assembly is set on the second frame (18) below the second upper roll assembly.

6. The roll forming device for full-specification square welded pipes according to claim 5, characterized in that: The second drive includes a second servo motor (31), a first worm gear reducer (32), a second worm gear reducer (33), and a first drive shaft; the output shaft of the first worm gear reducer (32) is connected to the first worm (24), the input shaft of the first worm gear reducer (32) is connected to the first drive shaft, the other end of the first drive shaft is connected to the second worm gear reducer (33), the second worm gear reducer (33) is connected to the second worm (30), and the second worm gear reducer (33) is connected to the second servo motor (31); the first drive shaft includes a third external spline shaft (35) and a third internal spline shaft (36), the third external spline shaft (35) is provided with an external spline, the third internal spline shaft (36) is provided with an internal spline, the third external spline shaft (35) and the third internal spline shaft (36) are connected by internal and external splines, the third external spline shaft (35) is connected to the first worm gear reducer (32); the third internal spline shaft (36) is connected to the second worm gear reducer (33).

7. The roll forming device for full-specification square welded pipes according to claim 5, characterized in that: A fourth external spline shaft is provided between the first upper roller shaft (19) and the second upper roller shaft (25), and the fourth external spline shaft is provided with an external spline; both the first upper roller shaft (19) and the second upper roller shaft (25) are provided with internal splines, and the two ends of the fourth external spline shaft are slidably connected to the first upper roller shaft (19) and the second upper roller shaft (25) through internal splines and external splines, respectively; when adjusting the distance, the first upper roller shaft (19) and the second upper roller shaft (25) move towards or away from each other; a torque connection end (14) is provided at the end of the second upper roller shaft (25) away from the fourth external spline shaft, which is connected to a torque output device.

8. The roll forming device for full-size square welded pipes according to claim 5, characterized in that: The full-size square welded pipe roll forming device also includes a lifting drive unit, which includes a first lifting worm gear reducer (37), a second lifting worm gear reducer (38), a third servo motor (39), and a second transmission shaft; the first lifting worm gear reducer (37) is located on the upper part of the first frame (17), and the worm of the first lifting worm gear reducer (37) passes through the upper part of the first frame (17) and connects to the first sliding seat (22). The first frame (17) and the first sliding seat (22) are slidably connected in the vertical direction through a dovetail / dovetail groove connection structure; the second lifting worm gear reducer (38) is located on the upper part of the second frame (18), and the worm of the second lifting worm gear reducer (38) passes through the second... The upper part of the frame (18) is connected to the second sliding seat (28). The second frame (18) and the second sliding seat (28) are slidably connected in the vertical direction through a dovetail / dovetail groove connection structure. The second transmission shaft includes a fifth external spline shaft (40) and a fifth internal spline shaft (41). The fifth external spline shaft (40) is provided with an external spline, and the fifth internal spline shaft (41) is provided with an internal spline. The fifth external spline shaft (40) and the fifth internal spline shaft (41) are connected by internal and external splines. The fifth external spline shaft (40) is connected to the first lifting worm gear reducer (37). The fifth internal spline shaft (41) is connected to the second lifting worm gear reducer (38), and the second lifting worm gear reducer (38) is connected to the third servo motor (39).

9. The roll forming device for full-size square welded pipes according to claim 5, characterized in that: The full-size square welded pipe roll forming device also includes a spacing adjustment mechanism and a sliding fixing component. The first frame (17) and the second frame (18) are slidably connected to the base on both sides in the strip length direction through the sliding fixing component. The spacing adjustment mechanism includes a spacing adjustment screw (42), which is set along the strip width direction. The spacing adjustment screw (42) is rotatably connected to the base and threadedly connected to the first frame (17) and the second frame (18).

10. The roll forming device for full-size square welded pipes according to claim 9, characterized in that: The adjusting mechanism further includes a support base (43), a first threaded sleeve (44), a second threaded sleeve (45), and a drive motor (46); two support bases (43) are provided on the base in the width direction of the strip, and the two support bases (43) are respectively located on one side of the first frame (17) and the second frame (18). The adjusting screw (42) is rotatably connected to the support base (43) through a bearing. The first threaded sleeve (44) is connected to the first frame (17), and the second threaded sleeve (45) is connected to the second frame (18). The adjusting screw (42) passes through the first threaded sleeve (44) and the second threaded sleeve (45); one end of the adjusting screw (42) is connected to the output shaft of the drive motor (46).

Images