A semi-circular pipe forming device

Abstract

The utility model relates to half round pipe forming technical field especially relates to a half round pipe forming device, include: frame, multiple half round pipe forming roller groups and first drive mechanism, multiple half round pipe forming roller groups are arranged in sequence on the frame along the transmission direction of strip material, and half round pipe forming roller group includes cam and concave wheel, and the clearance is formed between cam and concave wheel, first drive mechanism drives cam and concave wheel relative rotation, and the material is continuously transmitted and gradually curls into half round pipe shape, set up two auxiliary wheel subassembly in the output end of last half round pipe forming roller group, and auxiliary wheel subassembly includes fixed bolster, mounting seat and gyro wheel, and at least three gyro wheels are arranged in the mounting seat side facing half round pipe along strip material transmission direction interval, and are in rolling contact with the linear side wall of both sides of the half round pipe after forming, and the continuous rolling restraint is formed to the just formed half round pipe side wall, effectively suppresses the sudden release of the residual stress of curling, reduces the bending line produced in the size fluctuation in the bending process.

Description

Technical Field

[0001] This utility model relates to the field of semi-circular tube forming technology, and in particular to a semi-circular tube forming device. Background Technology

[0002] In the production and processing of semi-circular tube jackets used in reactors, metal sheets are first extruded and plastically deformed using forming equipment to form a tubular structure with a semi-circular cross-section (i.e., a semi-circular tube). The formed semi-circular tube is then bent using a bending machine to match its curvature with the arc surface of the reactor's outer wall, ensuring tight contact in the future. Finally, the semi-circular tube is welded to the reactor tube wall using a welding machine to form a jacket structure.

[0003] However, during the bending process of the semi-circular tube, the residual internal stress from the rolling process is released due to the change in the stress state of the tube wall. This stress release causes irregular fluctuations in the cross-sectional diameter of the semi-circular tube, resulting in irregular bending patterns such as wrinkles and depressions on the side wall surface of the semi-circular tube. This leads to an excessively large gap between the tube and the outer wall of the reactor, making it prone to defects such as discontinuous welds and incomplete welds during subsequent welding, which seriously restricts the overall production quality of the reactor. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a semi-circular tube forming device, which effectively solves the problems in the background art.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is: a semi-circular tube forming device, comprising: frame; Multiple sets of semi-circular tube forming rollers are arranged sequentially on the frame along the conveying direction of the strip. Each set of semi-circular tube forming rollers includes a cam and a concave wheel arranged opposite each other, with a gap formed between the cam and the concave wheel. The first driving mechanism drives the cam and the concave wheel in the semi-circular tube forming roller group of the intermediate group to rotate relative to each other, thereby driving the material to be continuously transported and gradually rolled into a semi-circular tube shape. Two auxiliary wheel assemblies are symmetrically arranged on both sides of the output end of the last set of semi-circular tube forming rollers. Each set of auxiliary wheel assemblies includes: A fixed bracket is mounted on the frame; Mounting base, connected to the fixed bracket; At least three rollers are arranged at intervals along the strip conveying direction on the side of the mounting base facing the semi-circular tube. The axis of the rollers is perpendicular to the strip conveying direction, and the roller surface is a plane adapted to the straight side wall of the semi-circular tube. The rollers of the two sets of auxiliary wheel assemblies respectively roll into contact with the two straight sidewalls of the shaped semi-circular tube.

[0006] Furthermore, a bending transition assembly is provided between the discharge side of the last set of semi-circular tube forming rollers and the inlet side of the bending roller frame, the bending transition assembly comprising: Two height adjustment levers; Two transition wheels are respectively connected to one end of the two height adjustment rods near the semi-circular tube; The two transition wheels respectively roll into contact with the top of the straight sidewalls on both sides of the semicircular tube. The height of the transition wheels is adjusted by the height adjustment rod to guide the semicircular tube into the bending process at a preset height and angle.

[0007] Furthermore, the bending transition assembly also includes: The lifting frame is a portal frame that spans across the top of the machine frame, with its two side columns slidably connected to the machine frame via linear guide rails; The second drive mechanism is used to drive the lifting frame to move up and down along the transmission direction perpendicular to the strip. The two height adjustment rods are vertically fixed to the crossbeam of the lifting frame, and their axes are parallel to the lifting direction of the lifting frame.

[0008] Furthermore, the second drive mechanism includes a second motor, a drive shaft, two worm gears, and two worms; Two worm gears are symmetrically arranged on both sides of the lifting frame along the transmission direction of the strip, and two worm wheels are mounted on the transmission shaft and mesh with the corresponding two worm gears for transmission. The second motor is connected to the drive shaft, and the drive shaft is rotatably mounted on the frame via a bearing assembly.

[0009] Furthermore, the circumferential surface of the height adjustment rod is provided with a keyway along the axial direction.

[0010] Furthermore, a support roller is provided on the frame at the lifting section position corresponding to the location of the transition wheel; An arc-shaped groove is provided around the circumference of the idler roller, and the diameter of the middle part of the idler roller located at the arc-shaped groove is smaller than the diameter of the middle part of the concave wheel of the last group of semi-circular tube forming rollers.

[0011] Furthermore, the distance between the two auxiliary wheel assemblies is equal to the distance between the two side walls of the shaped semi-circular tube.

[0012] Furthermore, the first drive mechanism includes a first motor, a reducer, a coupling, a first gear, and a second gear; The first motor is connected to the input end of the reducer, and the output end of the reducer is connected to the drive shaft of the concave wheel through a coupling. The first gear is mounted on the drive shaft of the concave wheel, and the second gear is mounted on the drive shaft of the cam. The first gear and the second gear mesh with each other.

[0013] Furthermore, the gap formed between the cam and the concave wheel of the last set of semi-circular tube forming rollers is consistent with the final shape to be formed of the strip.

[0014] Furthermore, the fixed bracket is provided with strip-shaped holes, the extension direction of which is perpendicular to the strip conveying direction and distributed radially along the semi-circular tube.

[0015] The beneficial effects of this utility model are as follows: By setting an auxiliary wheel assembly, this utility model forms a continuous rolling constraint on the newly formed semi-circular tube, effectively suppressing the sudden release of residual curling stress in subsequent processes, thereby stabilizing the diameter of the semi-circular tube and reducing bending marks caused by dimensional fluctuations during bending. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the semi-circular tube forming device; Figure 2 This is a top view of the semi-circular tube forming device; Figure 3 This is a right view of the semi-circular tube forming device; Figure 4 for Figure 1 A magnified view of part A; Figure 5 This is a cross-sectional view of the semi-circular tube forming device along the conveying direction. Figure 6 This is a schematic diagram of the structure of the first set of semi-circular tube forming rollers; Figure 7 This is a cross-sectional schematic diagram of the second group of semi-circular tube forming rollers; Figure 8 This is a schematic diagram of the structure of the third group of semi-circular tube forming rollers; Figure 9 A schematic diagram showing the installation of two transition rollers on the idler roller; Figure 10 This is a schematic diagram of the auxiliary wheel assembly.

[0017] Reference numerals: 1. Frame; 2. Semi-circular tube forming roller assembly; 21. Cam; 22. Concave wheel; 3. First drive mechanism; 4. Auxiliary wheel assembly; 41. Fixed bracket; 411. Strip hole; 42. Mounting seat; 43. Roller; 5. Bending transition assembly; 51. Height adjustment rod; 52. Transition wheel; 53. Lifting frame; 54. Second drive mechanism; 6. Support roller. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0019] like Figures 1 to 10 The semi-circular tube forming device shown includes: a frame 1, multiple sets of semi-circular tube forming rollers 2 and a first drive mechanism 3. The multiple sets of semi-circular tube forming rollers 2 are arranged sequentially on the frame 1 along the conveying direction of the strip. Each set of semi-circular tube forming rollers 2 includes a cam 21 and a concave wheel 22 arranged opposite to each other. A forming gap is formed between the cam 21 and the concave wheel 22 for the strip to pass through. The first drive mechanism 3 drives the cam 21 and the concave wheel 22 in the intermediate semi-circular tube forming roller group 2 to rotate relative to each other, thereby driving the material to be continuously transported and gradually rolled into a semi-circular tube shape. Among them, two auxiliary wheel assemblies 4 are symmetrically arranged on both sides of the output end of the last set of semi-circular tube forming rollers 2. Each set of auxiliary wheel assemblies 4 includes a fixed bracket 41, a mounting base 42 and a roller 43. A fixed bracket 41 is mounted on the frame 1; a mounting base 42 is connected to the fixed bracket 41; at least three rollers 43 are arranged at intervals along the strip conveying direction on the side of the mounting base 42 facing the semi-circular tube, the axis of the rollers 43 is perpendicular to the strip conveying direction, and the wheel surface is a plane adapted to the straight side wall of the semi-circular tube; the rollers 43 of the two sets of auxiliary wheel assemblies 4 respectively roll in contact with the two straight side walls of the formed semi-circular tube.

[0020] In this plan, such as Figure 5 As shown, the semi-circular tube forming roller group 2 is set with three groups. The first group is the preliminary bending roller group, which bends the strip into an arc with an opening angle of 120°. The second group is the semi-circular arc shaping roller group, which curls the strip into a semi-circular arc with an opening angle of 90°. The third group is the opening size shaping roller group, with vertical limiting edges on both sides of the cam 21, which finally forms a standard semi-circular tube cross section.

[0021] The specific forming process is as follows: Figures 6-9 As shown, Step 1: The strip enters the first set of semi-circular tube forming rollers 2 from the device inlet. Under the pressure of the cam 21 and the concave wheel 22, it begins to bend initially and gradually forms an arc profile as it is conveyed. Step 2: When passing through the second set of semi-circular arc shaping rollers, the strip is further curled and the semi-circular arc is gradually shaped, with the inner arc radius reaching the design value. Step 3: The third set of semi-circular arc shaping rollers constrains the two side walls of the strip through the limiting edge, stabilizing the opening distance and forming a standard semi-circular tube cross section. Step 4: The formed semi-circular tube enters the auxiliary wheel assembly 4. The two side rollers 43 roll in contact with the straight side walls, continuously constraining the side wall distance, suppressing the deformation caused by the residual stress of curling, and finally outputting it to the next bending process with stable dimensions.

[0022] In this invention, by setting up an auxiliary wheel assembly 4, a continuous rolling constraint is formed on the newly formed semi-circular tube, which effectively suppresses the sudden release of residual curling stress in subsequent processes, thereby stabilizing the diameter of the semi-circular tube and reducing bending patterns such as wrinkles and dents caused by size fluctuations during bending.

[0023] like Figure 1 and Figure 3 As shown, a bending transition assembly 5 is provided between the discharge side of the last set of semi-circular tube forming roller group 2 and the inlet side of the bending roller frame. The bending transition assembly 5 includes two height adjustment rods 51 and two transition wheels 52. The two transition wheels 52 are respectively connected to one end of the two height adjustment rods 51 near the semi-circular tube. The two transition wheels 52 roll in contact with the top of the straight sidewalls on both sides of the semicircular tube. The height of the transition wheels 52 is adjusted by the height adjustment rod 51 to guide the semicircular tube into the bending process at a preset height and angle.

[0024] The height and tilt angle of the transition wheel 52 are precisely controlled by the height adjustment rod 51, making the transition from straight-line transmission to arc bending of the semi-circular tube smoother. This avoids the surge in localized stress caused by excessive height difference in traditional processes, fundamentally reducing the stress release amplitude during bending and further suppressing diameter fluctuations and bending marks. Furthermore, the transition wheel 52 can be made of nylon, and with its flat wheel surface design, it effectively constrains the semi-circular tube while avoiding rigid compression or scratches on the sidewalls, keeping the surface roughness within a reasonable range and providing a good surface foundation for subsequent welding processes.

[0025] Preferably, the bending transition assembly 5 further includes a lifting frame 53 and a second drive mechanism 54. The lifting frame 53 is a portal frame spanning above the frame 1, with its two side columns slidably connected to the frame 1 via linear guide rails. The second drive mechanism 54 is used to drive the lifting frame 53 to perform lifting and lowering actions perpendicular to the conveying direction of the strip. Two height adjustment rods 51 are vertically fixed to the crossbeam of the lifting frame 53, and their axes are parallel to the lifting and lowering direction of the lifting frame 53.

[0026] Automated adjustment shortens height adjustment time during shape change, and the preset parameter library enables one-click switching between different specifications of semi-circular tubes, ensuring that the transition posture of products in the same batch is completely consistent.

[0027] As a preferred structure, the second drive mechanism 54 includes a second motor, a drive shaft, two worm gears, and two worms; the two worms are symmetrically arranged on both sides of the lifting frame 53 along the transmission direction of the strip, the two worm gears are mounted on the drive shaft and mesh with the corresponding two worms for transmission; the second motor is connected to the drive shaft, and the drive shaft is rotatably mounted on the frame 1 through a bearing assembly.

[0028] When the height of the lifting frame 53 needs to be adjusted, the second motor receives a control signal and drives the transmission shaft to rotate via a coupling. The transmission shaft drives the worm gears at both ends to rotate synchronously, and the worm gears mesh with the worm, driving the worm to make a vertical helical motion within the nut seat. The worms on both sides drive the two columns of the lifting frame 53 to rise synchronously along the linear guide rail via flanges. When the target height is reached, the motor's electromagnetic brake is activated, and the threads of the worm and the nut seat self-lock. In another preferred embodiment, the second drive mechanism 54 can also adopt a rigid linkage structure of a ball screw pair and a synchronous connecting rod.

[0029] like Figure 3 As shown, a support roller 6 is provided on the frame 1 at the lifting section position corresponding to the transition wheel 52; an arc-shaped groove is provided on the circumference of the support roller 6, and the diameter of the middle part of the support roller 6 at the arc-shaped groove is smaller than the diameter of the middle part of the concave wheel 22 of the last set of semi-circular tube forming roller group 2.

[0030] During the bending process, the outer arc surface of the bottom of the semi-circular tube naturally falls into the arc-shaped groove of the roller 6. The roller 6 provides upward support through surface contact, limiting its downward deformation. Meanwhile, the transition rollers 52 on both sides, under the action of the height adjustment rod 51, press the top surface of the two side walls of the semi-circular tube with a preset pressure, forming a downward constraint force, limiting the side walls from warping upward due to stress release. Under the vertical clamping of the downward support and pressure, the cross-sectional shape of the semi-circular tube remains stable and enters the bending roller frame in a straight line, avoiding uneven bending stress caused by cross-sectional deformation.

[0031] As a preferred structure, the circumferential surface of the height adjustment rod 51 is provided with a keyway along the axial direction, which can always keep the axis of the roller 43 parallel to the axis of the idler roller 6.

[0032] In this design, the distance between the two auxiliary wheel assemblies 4 is equal to the distance between the two side walls of the formed semi-circular tube. Through precise positioning of the side walls, combined with the radial constraint of the auxiliary wheels on the arc-shaped outer side walls, the semi-circular tube forms a rigid frame before entering the bending process, thus improving its overall resistance to deformation.

[0033] As a preferred embodiment, the first drive mechanism 3 includes a first motor, a reducer, a coupling, a first gear, and a second gear. The first motor is connected to the input end of the reducer, and the output end of the reducer is connected to the drive shaft of the concave wheel 22 via the coupling. The first gear is mounted on the drive shaft of the concave wheel 22, and the second gear is mounted on the drive shaft of the cam 21. The first gear and the second gear mesh with each other. When the concave wheel 22 rotates with the drive shaft, the meshing transmission between the first gear and the second gear drives the cam 21 to rotate synchronously in the opposite direction, forming a stable clamp on the strip and transmitting it forward. At the same time, the arc-shaped contour of the wheel surface achieves gradual forming.

[0034] In the preferred embodiment of this solution, the gap formed between the cam 21 and the concave wheel 22 of the last set of semi-circular tube forming rollers 2 is consistent with the final shape to be formed of the strip, so there is no need to add a separate straightening process after forming.

[0035] like Figure 10 As shown, in a preferred embodiment, the fixed bracket 41 is provided with a strip hole 411, the extension direction of the strip hole 411 is perpendicular to the strip conveying direction, and is distributed radially along the semi-circular tube.

[0036] The fixed bracket 41 is detachably connected to the frame 1 by fastening bolts passing through the strip hole 411. After the fastening bolts are loosened, the fixed bracket 41 can be translated along the length of the strip hole 411, thereby driving the mounting base 42 and the roller 43 to move radially along the semi-circular tube. This allows the contact position of the roller 43 on the straight wall of the semi-circular tube to be flexibly adjusted according to the height of the straight wall of the semi-circular tube, ensuring that it always acts on the effective constraint area of ​​the straight wall.

[0037] Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A semi-circular tube forming device, characterized in that, include: Rack (1); Multiple sets of semi-circular tube forming rollers (2) are arranged sequentially on the frame (1) along the conveying direction of the strip. Each set of semi-circular tube forming rollers (2) includes a cam (21) and a concave wheel (22) arranged opposite to each other, with a gap formed between the cam (21) and the concave wheel (22). The first driving mechanism (3) is used to drive the cam (21) and the concave wheel (22) in the semi-circular tube forming roller group (2) of the intermediate group to rotate relative to each other, thereby driving the material to be continuously transported and gradually rolled into a semi-circular tube shape; Among them, two auxiliary wheel assemblies (4) are symmetrically arranged on both sides of the output end of the last group of semi-circular tube forming rollers (2), and the auxiliary wheel assembly (4) includes: A fixed bracket (41) is mounted on the frame (1); Mounting base (42) is connected to the fixed bracket (41); At least three rollers (43) are arranged at intervals along the strip transport direction on the side of the mounting base (42) facing the semi-circular tube, and the axis of the rollers (43) is perpendicular to the strip transport direction; The rollers (43) of the two sets of auxiliary wheel assemblies (4) respectively roll in contact with the two straight side walls of the formed semi-circular tube.

2. The semi-circular tube forming device according to claim 1, characterized in that, A bending transition assembly (5) is provided between the discharge side of the last set of semi-circular tube forming rollers (2) and the inlet side of the bending roller frame. The bending transition assembly (5) includes: Two height adjustment levers (51); Two transition wheels (52) are respectively connected to one end of the two height adjustment rods (51) near the semi-circular tube; The two transition wheels (52) respectively roll in contact with the top of the straight sidewalls on both sides of the semicircular tube. The height of the transition wheels (52) is adjusted by the height adjustment rod (51) to guide the semicircular tube into the bending process at a preset height and angle.

3. The semi-circular tube forming device according to claim 2, characterized in that, The bending transition component (5) also includes: The lifting frame (53) is a portal frame that spans across the frame (1); The second drive mechanism (54) is used to drive the lifting frame (53) to move up and down along the transmission direction perpendicular to the strip. Two height adjustment rods (51) are vertically fixed to the crossbeam of the lifting frame (53), and the axis of the height adjustment rods (51) is parallel to the lifting direction of the lifting frame (53).

4. The semi-circular tube forming device according to claim 3, characterized in that, The second drive mechanism (54) includes a second motor, a drive shaft, two worm gears, and two worms; Two worm gears are arranged on both sides of the lifting frame (53) along the transmission direction of the strip, and two worm wheels are mounted on the transmission shaft and mesh with the corresponding two worm gears for transmission. The second motor is connected to the drive shaft, and the drive shaft is rotatably mounted on the frame (1) via a bearing assembly.

5. The semi-circular tube forming device according to claim 3, characterized in that, The height adjustment rod (51) has a keyway on its circumferential surface along the axial direction.

6. The semi-circular tube forming device according to claim 2, characterized in that, A roller (6) is provided on the frame (1) at the lifting section position corresponding to the transition wheel (52); An arc-shaped groove is provided on the circumference of the idler roller (6), and the diameter of the middle part of the idler roller (6) located at the arc-shaped groove is smaller than the diameter of the middle part of the concave wheel (22) of the last group of semi-circular tube forming rollers (2).

7. The semi-circular tube forming device according to claim 1, characterized in that, The distance between the two auxiliary wheel assemblies (4) is equal to the distance between the two side walls of the shaped semi-circular tube.

8. The semi-circular tube forming device according to claim 1, characterized in that, The first drive mechanism (3) includes a first motor, a reducer, a coupling, a first gear, and a second gear; The first motor is connected to the input end of the reducer, and the output end of the reducer is connected to the drive shaft of the concave wheel (22) through a coupling. The first gear is mounted on the drive shaft of the concave wheel (22), and the second gear is mounted on the drive shaft of the cam (21). The first gear and the second gear mesh with each other.

9. The semi-circular tube forming device according to claim 1, characterized in that, The gap formed between the cam (21) and the concave wheel (22) of the last set of semi-circular tube forming rollers (2) is consistent with the final shape to be formed of the strip.

10. The semi-circular tube forming apparatus according to claim 1, characterized in that, The fixed bracket (41) is provided with a strip hole (411), the extension direction of the strip hole (411) is perpendicular to the strip transmission direction, and is distributed radially along the semi-circular tube.

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