A large-size steel pipe forming device

Abstract

This invention discloses a large-size steel pipe forming device, including a conveyor belt for conveying U-shaped steel for forming steel pipes with a diameter of not less than 200 mm. Oiling mechanisms are provided on both sides of the conveyor belt, each including a driven, rotatable roller. A first oil-absorbing cotton is fitted onto the roller, and the first oil-absorbing cotton applies oil to the U-shaped steel on the conveyor belt through rolling. This large-size steel pipe forming device provides uniform oiling of the U-shaped steel through the rolling application of the first oil-absorbing cotton on the roller, reducing friction between the U-shaped steel and the forming machine.

Description

Technical Field

[0001] This invention relates to steel pipe forming technology, and more specifically, to a large-size steel pipe forming device. Background Technology

[0002] There are two main forming methods for large-diameter steel pipes: JCOE forming and UOE forming. The JCOE process involves forming the steel plate in the order of J-forming, C-forming, and O-forming. After the pipe seam is joined, gas shielded welding is used for pre-welding, followed by submerged arc welding for internal and external final welding. Finally, a segmented mechanical expansion process is used to cold-expand the entire pipe diameter, followed by a series of inspections. The UOE forming process first requires beveling, flattening, and bending the edges of the steel plate. Then, it is first pressed into a U-shape using a forming machine, and then bent into an O-shape. After the pipe seam is joined, gas shielded welding is used for pre-welding, followed by submerged arc welding for internal and external final welding. Finally, a segmented mechanical expansion process is used to cold-expand the entire pipe diameter. After the steel pipe forming and welding are completed, a series of inspections are performed.

[0003] For example, Chinese patent application number CN202211080873.9, published on September 5, 2022, discloses an extrusion molding device for irregularly shaped steel pipes and its usage method. The device includes an operating table with a tabletop. Several support legs are fixedly connected to the bottom of the tabletop. A second motor is installed on the rear side wall of the rear support leg. A translational device is provided between the front and rear support legs. The translational device includes two parallel lead screws, and a pulley is provided between the two lead screws and the rear support leg. The limiting device and the front limiting device of this invention respectively clamp the front end of the formed irregularly shaped steel pipe and the rear end of the circular steel pipe blank, allowing them to move smoothly. This makes the circular steel pipe blank less prone to twisting when extruded by the mold. In this invention, the oil-absorbing cotton at both ends extends into the oil grooves at both ends to guide the oil into the oil-absorbing cotton. Before entering the mold groove, oil is applied to the outer side wall of the front end of the circular steel pipe blank, reducing friction on the mold and extending the mold's service life.

[0004] In the process of bending a steel pipe from a U-shape to an O-shape, the U-shaped steel pipe is generally fed into the forming machine along the conveying device. The forming machine extrudes the U-shaped steel pipe into an O-shaped steel pipe. During the extrusion, oil needs to be applied to the surface of the steel pipe to reduce friction. However, the oil is generally applied by spraying oil through a nozzle, which results in uneven oil spraying and excess oil flowing into the forming machine. Summary of the Invention

[0005] The purpose of this invention is to provide a large-size steel pipe forming device to overcome the above-mentioned shortcomings in the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A large-size steel pipe forming device includes a conveyor belt for conveying U-shaped steel for forming steel pipes with a diameter of not less than 200 mm. Oiling mechanisms are provided on both sides of the conveyor belt. Each oiling mechanism includes a driven and rotatable roller. A first oil-absorbing cotton is sleeved on the roller, and the first oil-absorbing cotton rolls and applies oil to the U-shaped steel on the conveyor belt.

[0008] The above-mentioned large-size steel pipe forming device has a U-shaped steel with an outer diameter of 200mm.

[0009] In the aforementioned large-size steel pipe forming device, multiple guide wheels are spaced apart on both sides of the conveyor belt, and the guide wheels are driven to rotate.

[0010] In the above-mentioned large-size steel pipe forming device, the roller and the guide wheel are coaxially arranged, the roller is positioned above the guide wheel, an oil storage cylinder is provided inside the roller, the oil storage cylinder is rotatable by a drive, a plurality of oil outlet holes are opened on the surface of the oil storage cylinder, and a second oil-absorbing cotton is provided inside the oil storage cylinder.

[0011] The aforementioned large-size steel pipe forming device further includes a third oil-absorbing cotton disposed on the inner wall of the roller. A squeezing roller is movably connected in the annular cavity between the third oil-absorbing cotton and the oil storage cylinder. The squeezing roller is driven to move radially along the oil storage cylinder, thereby changing the squeezing force on the third oil-absorbing cotton.

[0012] In the aforementioned large-size steel pipe forming device, a movable seat is movably connected to the oil storage cylinder, and the extrusion roller is fixed to the movable seat via a connecting rod. A counterweight rod is provided on the side of the movable seat away from the extrusion roller. An adjusting rod is rotatably connected to the oil storage cylinder. The surface of the adjusting rod is provided with multiple annular grooves spaced apart, and each pair of annular grooves is connected by a horizontal groove. The two adjacent horizontal grooves are spaced 180° apart. A lever is rotatably connected to the movable seat. The lever is perpendicular to the adjusting rod, and the end of the lever away from the movable seat extends into the annular groove.

[0013] The above-mentioned large-size steel pipe forming device includes a rotating column inside the drum, two arc-shaped plates fixed at intervals on the rotating column, a connecting sleeve movably provided above the oil storage cylinder, a first protrusion provided at intervals on the surface of the connecting sleeve, the first protrusion being disposed between the two arc-shaped plates, a first rack rotatably connected to the surface of the connecting sleeve, and a first gear rotatably provided on the adjusting rod, with the end of the first rack away from the connecting sleeve meshing with the first gear.

[0014] In the aforementioned large-size steel pipe forming device, the oil storage cylinder and the guide wheel are connected by a locking component.

[0015] In the above-mentioned large-size steel pipe forming device, a positioning pin is slidably connected to the inner wall of the guide wheel, a through hole is opened on the surface of the oil storage cylinder, the axis of the through hole is on the same straight line as the axis of the positioning pin, a third elastic element is connected between the positioning pin and the guide wheel, and the end of the positioning pin away from the guide wheel is inserted into the through hole.

[0016] In the aforementioned large-size steel pipe forming device, a positioning sleeve is rotatably connected to the inner wall of the guide wheel. One end of the positioning sleeve is open, and a positioning pin is slidably inserted into the positioning sleeve. An L-shaped groove is formed on the surface of the positioning sleeve, and a second protrusion is provided at one end of the positioning pin. The second protrusion is located in the horizontal section of the L-shaped groove. A first wedge block and a second wedge block are slidably connected to the inner wall of the guide wheel. The first wedge block moves linearly along the axial direction of the positioning sleeve, and the second wedge block moves linearly along the radial direction of the positioning sleeve. A second rack is provided on the second wedge block, and a second gear is provided on the positioning sleeve. The second rack meshes with the second gear.

[0017] The beneficial effects of the present invention are as follows: The large-size steel pipe forming device provided by the present invention uses the first oil-absorbing cotton on the roller to roll and apply oil to the U-shaped steel, and the oil application is uniform, which reduces the friction between the U-shaped steel and the forming machine. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0019] Figure 1 This is a schematic diagram of a large-size steel pipe forming device according to one embodiment of the present invention;

[0020] Figure 2 This is a schematic diagram of an oil storage cylinder structure provided in one embodiment of the present invention;

[0021] Figure 3 A schematic diagram of a large-size steel pipe forming device provided for another embodiment of the present invention;

[0022] Figure 4 A schematic diagram of an adjusting rod structure provided for another embodiment of the present invention;

[0023] Figure 5 This is a schematic diagram of a locking component structure provided for another embodiment of the present invention.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1-Drum; 11-First oil-absorbing cotton; 111-Conveyor belt; 12-Third oil-absorbing cotton; 13-U-shaped steel; 14-Rotating column; 141-Arc plate; 15-Annular baffle; 16-Return trough; 2-Guide wheel; 3-Oil storage cylinder; 31-Second oil-absorbing cotton; 32-Moving seat; 4-Squeezing roller; 5-Adjusting rod; 53-First gear; 54-Counterweight rod; 6-Connecting sleeve; 61-First protrusion; 62-First rack; 7-Positioning pin; 71-Second protrusion; 81-First wedge block; 82-Second wedge block; 821-Second rack; 9-Positioning sleeve; 91-Second gear. Detailed Implementation

[0026] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0027] This invention provides a large-size steel pipe forming device. Large-size steel pipe refers to steel pipe with an outer diameter greater than 219mm, that is, steel pipe with DN200 (200mm) or more. The forming machine included is a machine for bending U-shaped steel 13 into O-shaped steel in the UOE forming process. The steel plate is first extruded into U-shaped steel 13, and then the U-shaped steel 13 is fed into the forming machine by the conveyor belt 111. The forming machine extrudes the U-shaped steel 13 into O-shaped steel. During extrusion, the U-shaped steel 13 rubs against the inner wall of the forming machine. Therefore, it is necessary to lubricate the surface of the U-shaped steel 13 to reduce friction.

[0028] like Figures 1-5 As shown in the figure, an embodiment of the present invention provides a large-size steel pipe forming device, including a conveyor belt 111 for conveying U-shaped steel 13. Oiling mechanisms are provided on both sides of the conveyor belt 111. The oiling mechanism includes a driven and rotatable roller 1. A first oil-absorbing cotton 11 is sleeved on the roller 1. The first oil-absorbing cotton 11 rolls and applies oil to the steel pipe on the conveyor belt 111.

[0029] Specifically, the U-shaped steel 13 is conveyed to the feed inlet of the forming machine by the conveyor belt 111. Rollers 1 are set on both sides of the conveyor belt 111. Multiple rollers 1 can be set. The rotation axis of the roller 1 is perpendicular to the movement direction of the U-shaped steel 13. The first oil-absorbing cotton 11 is sleeved on the circumferential surface of the roller 1. When the U-shaped steel 13 passes the roller 1, the first oil-absorbing cotton 11 adheres to the surface of the vertical section of the U-shaped steel 13. The U-shaped steel 13 drives the roller 1 to rotate passively. The first oil-absorbing cotton 11 rolls and applies oil to the surface of the U-shaped steel 13. An oil spray pipe can be set at the upper end of the first oil-absorbing cotton 11. When the first oil-absorbing cotton 11 rotates, the oil spray pipe replenishes oil to the first oil-absorbing cotton 11.

[0030] The beneficial effect of this embodiment of the invention is that the U-shaped steel 13 is coated with oil by the first oil-absorbing cotton 11 on the roller 1, the oil is evenly applied, and the friction between the U-shaped steel 13 and the forming machine is reduced.

[0031] In another embodiment of the present invention, a plurality of guide wheels 2 are spaced apart on both sides of the conveyor belt 111. The guide wheels 2 are driven to rotate and play the role of conveying and limiting. When the U-shaped steel 13 passes the guide wheel 2, the guide wheel 2 rotates to push the U-shaped steel 13 so that the U-shaped steel 13 leaves the conveyor belt 111 and enters the forming machine.

[0032] In another embodiment of the present invention, the roller 1 and the guide wheel 2 are coaxially arranged, and the roller 1 and the guide wheel 2 are a cylindrical body that passes through both ends. The roller 1 has several oil outlet grooves on its circumference. The roller 1 is located above the guide wheel 2. The conveyor belt 111 has bases on both sides. The roller 1 is rotatably connected to the base, and the guide wheel 2 is also rotatably connected to the base. The roller 1 and the guide wheel 2 do not contact each other, and the outer diameter of the roller 1 is not greater than the outer diameter of the guide wheel 2 (preferably the same; when the U-shaped steel 13 is attached to the surface of the guide wheel 2, it is also completely attached to the surface of the roller 1, so that the first oil-absorbing cotton 11 on the circumference of the roller 1 can be completely squeezed by the U-shaped steel 13). The roller 1 is provided with an oil storage cylinder 3, which rotates. Connected to the base, the oil storage cylinder 3 has an internal cavity. The outer diameter of the oil storage cylinder 3 is smaller than the inner diameter of the roller 1 and the guide wheel 2. The oil storage cylinder 3 is driven to rotate. The oil storage cylinder 3 and the guide wheel 2 can share the same driving component or each can be driven by a separate driving component (in this case, the roller 1 and the guide wheel 2 are rotatably connected to each other so that they can rotate independently). The oil storage cylinder 3 has several oil outlet holes on its circumference. The oil storage cylinder 3 is provided with a second oil-absorbing cotton 31 inside, which fills the cavity inside the oil storage cylinder 3. The oil storage cylinder 3 is provided with an oil inlet, which is used to replenish the oil in the second oil-absorbing cotton 31 inside the oil storage cylinder 3. Under the adsorption effect of the second oil-absorbing cotton 31, the oil in the oil storage cylinder 3 will not overflow the oil outlet holes.

[0033] Specifically, when the U-shaped steel enters the space between the guide wheels 2 along the conveyor belt 111, the guide wheels 2 push the U-shaped steel 13 into the forming machine. Simultaneously, as the U-shaped steel 13 moves, it squeezes the first oil-absorbing cotton 11 above the guide wheels 2 and drives the roller 1 to rotate, rolling and coating the surface of the U-shaped steel 13 with oil. After one U-shaped steel 13 is coated, the guide wheels 2 stop rotating. At the same time, the oil inlet on the oil storage cylinder 3 replenishes the second oil-absorbing cotton 31 with oil. After replenishment (if the oil storage cylinder 3 and the guide wheels 2 share a driving component), the guide wheels 2 drive the oil storage cylinder 3 to rotate. The rotation speed of the guide wheels 2 may not be high enough to match the travel speed of the U-shaped steel 13, causing some of the lubricating oil thrown out by the second oil-absorbing cotton 31 in the oil storage cylinder 3 to drip along the gap between the oil storage cylinder 3 and the roller 1. Annular baffles 15 can be provided on both the inner wall of the roller 1 and the outer wall of the oil storage cylinder 3. The oil storage cylinder 3 passes through the annular baffles 15 in a dynamic seal. The annular baffles 15 are used to collect the oil from the inner wall of the roller 1. The lubricant flowing down the outer wall of the oil storage cylinder 3 is continuously absorbed by the bottom of the first oil-absorbing cotton 11, which extends into the space formed by the annular baffle 15 and the roller 1. A return groove 16 is provided on the outer wall of the oil storage cylinder 3, located above the annular baffle 15. The lubricant collected in the space formed by the roller 1, the oil storage cylinder 3, and the annular baffle 15 flows back into the oil storage cylinder 3 through the return groove 16. Subsequently, under capillary and centrifugal action, the oil storage cylinder 3 throws the lubricant in the second oil-absorbing cotton 31 out through the oil outlet hole on the surface of the oil storage cylinder 3. The lubricant enters the first oil-absorbing cotton 11 through the oil outlet groove on the surface of the roller 1 to replenish the first oil-absorbing cotton 11. If the oil storage cylinder 3 is driven by a single drive unit, the oil storage cylinder 3 can rotate rapidly under the action of the drive unit, and the lubricant is thrown out under a sufficiently large centrifugal force, so the annular baffle 15 is not required. The beneficial effect of this embodiment is that it can quickly and evenly replenish the first oil-absorbing cotton 11.

[0034] The above solution also has certain defects. When the U-shaped steel 13 is pressing the first oil-absorbing cotton 11 on the surface of the roller 1, the roller 1 rotates, causing the roller 1 to squeeze out a large amount of lubricating oil in the first oil-absorbing cotton 11 in the first rotation. This results in a large amount of oil being applied to the part of the U-shaped steel 13 that passes through the roller 1 first, while less oil is applied to the subsequent U-shaped steel 13, resulting in uneven oil application.

[0035] In another embodiment of the present invention, a third oil-absorbing cotton 12 is further provided on the inner wall of the roller 1. The third oil-absorbing cotton 12 on the inner wall of the roller 1 is connected to the first oil-absorbing cotton 11 on the outer wall of the roller 1 through an oil outlet groove. A squeeze roller 4 is movably connected in the annular cavity between the third oil-absorbing cotton 12 and the oil storage cylinder 3. The squeeze roller 4 is vertically arranged in the annular cavity. One end of the squeeze roller 4 is slidably connected to the base. The squeeze roller 4 moves linearly along the radial direction of the roller 1. The other end of the squeeze roller 4 is suspended. The squeeze roller 4 is parallel to the oil storage cylinder 3. The middle of the squeeze roller 4 is a rotating part that can rotate. The rotating part is in contact with the third oil-absorbing cotton 12, and the length of the rotating part is the same as the height of the third oil-absorbing cotton 12. The tangent of the contact between the roller 1 and the U-shaped steel 13 is on the same diameter as the axis of the extrusion roller 4, so that when the first oil-absorbing cotton 11 is squeezed by the U-shaped steel 13 and recovers, it can just absorb the lubricating oil squeezed out by the rotating part in the third oil-absorbing cotton 12. The extrusion roller 4 is driven to move radially along the roller 1, thereby changing the extrusion force on the third oil-absorbing cotton 12. An electric push rod can be set on the base, and the output end of the electric push rod is fixed on the extrusion roller 4. The extension and retraction direction of the electric push rod is on the same straight line as the movement direction of the extrusion roller 4.

[0036] Specifically, under centrifugal force, the oil storage cylinder 3 throws the lubricating oil in the second oil-absorbing cotton 31 through the oil outlet on the surface of the oil storage cylinder 3 into the third oil-absorbing cotton 12 on the inner wall of the roller 1. When the U-shaped steel 13 passes through the roller 1, it drives the roller 1 to rotate and squeeze the first oil-absorbing cotton 11 to roll and coat the U-shaped steel 13 with oil. At the same time, the roller 1 rotates and moves relative to the extrusion roller 4. The extrusion roller 4 squeezes out the lubricating oil in the third oil-absorbing cotton 12. During the recovery process, the first oil-absorbing cotton 11 absorbs the lubricant squeezed out by the third oil-absorbing cotton 12 through the oil absorption groove for replenishment. After the roller 1 rotates once, both the first oil-absorbing cotton 11 and the third oil-absorbing cotton 12 have been squeezed once. Then the extrusion roller 4... Driven by an electric push rod, the roller 1 moves radially toward the third oil-absorbing cotton 12 along the oil storage cylinder 3, increasing the squeezing pressure of the rotating part on the squeezing roller 4 on the third oil-absorbing cotton 12. This allows the remaining lubricant inside the third oil-absorbing cotton 12 to be squeezed out. That is, each time the squeezing pressure is increased a little, the roller 1 continues to rotate and moves relative to the squeezing roller 4. The squeezing roller 4 squeezes out the lubricant inside the third oil-absorbing cotton 12. At the same time, the first oil-absorbing cotton 11 absorbs the lubricant squeezed out by the third oil-absorbing cotton 12 through the oil absorption groove during the recovery process to replenish it. The above process is repeated until the squeezing roller 4 squeezes the third oil-absorbing cotton 12 to the maximum extent. In this way, the third oil-absorbing cotton 12 can slowly release the lubricant and spread it more evenly.

[0037] In another embodiment of the present invention, a movable seat 32 is movably connected to the oil storage cylinder 3. The movable seat 32 moves linearly along the radial direction of the oil storage cylinder 3. A first elastic element is also connected between the movable seat 32 and the oil storage cylinder 3. The extension and retraction direction of the first elastic element is parallel to the movement direction of the movable seat 32. The extrusion roller 4 is fixed to the movable seat 32 via a connecting rod. A counterweight rod 54 is provided on the side of the movable seat 32 away from the extrusion roller 4. The counterweight rod 54 is disposed in an annular cavity. The counterweight rod 54 is connected to the movable seat 32 via a connecting rod. The counterweight rod 54 is parallel to the extrusion roller 4. The axes of the counterweight rod 54 and the extrusion roller 4 are on the same diameter of the roller 1. The initial position of the counterweight rod 54 (when the first elastic element is not extended or retracted) is parallel to the third elastic element. The oil-absorbing cotton 12 does not contact each other, and the weight of the counterweight 54 is greater than the weight of the squeezing roller 4. An adjusting rod 5 is rotatably connected to the oil storage cylinder 3. The adjusting rod 5 is driven to rotate. Multiple annular grooves 51 are spaced apart on the surface of the adjusting rod 5. Each pair of annular grooves 51 is connected by a horizontal groove 52. The two adjacent horizontal grooves 52 are spaced 180° apart. A lever 321 is rotatably connected to the movable seat 32. The lever 321 is perpendicular to the adjusting rod 5. The lever 321 is rotatably connected to the movable seat 32 by a rotating shaft. A torsion spring is sleeved on the rotating shaft for the lever 321 to reset. The lever 321 rotates in one direction. The end of the lever 321 away from the movable seat 32 extends into the annular groove 51.

[0038] Specifically, when the oil storage cylinder 3 rotates (the oil storage cylinder 3 and the guide wheel 2 each have independent driving components) ，The oil storage cylinder 3 is coaxial with the guide wheel 2. Two motors are mounted on the base. One motor is built into the annular cavity between the oil storage cylinder 3 and the guide wheel 2, and the other motor is located outside the guide wheel 2. The motors are connected to the oil storage cylinder 3 and the guide wheel 2 via a belt pulley drive. When replenishing oil to the third oil-absorbing cotton 12, the counterweight rod 54 on the oil storage cylinder 3 pulls the moving seat 32 under centrifugal force, causing the squeezing roller 4 to move away from the third oil-absorbing cotton 12. Simultaneously, during the movement, the lever 321 of the moving seat 32 abuts against the annular groove 51 and rotates, thus horizontally leaving the annular groove 51. Subsequently, the oil storage cylinder 3 stops rotating, and the moving seat 32 resets under the action of the first elastic element. Since the lever 321 cannot rotate at this time, it is locked in the annular groove 51. The U-shaped steel 13 passes through the roller 1 under the push of the guide wheel 2, and the first oil-absorbing cotton 11 on the roller 1 is applied to the surface of the U-shaped steel 13. During the rolling oiling process, for each rotation of the roller 1, the adjusting rod 5 is driven to rotate 180°, causing the lever 321 to move relative to the annular groove 51 and reach the horizontal groove 52. The moving seat 32 is reset under the action of the elastic element, causing the lever 321 to pass through the horizontal groove 52 and reach another annular groove 51. At this time, the extrusion roller 4 moves toward the position of the third oil-absorbing cotton 12 and extrudes the third oil-absorbing cotton 12. When the third oil-absorbing cotton 12 moves relative to the extrusion roller 4, the oil in the third oil-absorbing cotton 12 is squeezed into the first oil-absorbing cotton 11 for replenishment. In this way, after the oil storage cylinder 3 extrudes the lubricating oil on its surface for each rotation, the extrusion roller 4 will compress the third oil-absorbing cotton 12 to a greater extent until the moving seat 32 is reset. At this time, the extrusion roller 4 completely extrudes the third oil-absorbing cotton 12 until the U-shaped steel 13 leaves the roller 1. Then the oil storage cylinder 3 starts to replenish oil and repeats the above process to oil the next U-shaped steel 13.

[0039] In another embodiment of the present invention, a rotating column 14 is provided inside the roller 1. The end of the roller 1 near the base is not open. Two arc-shaped plates 141 are fixed at intervals on the rotating column 14. A connecting sleeve 6 is movably provided above the oil storage cylinder 3. One end of the connecting sleeve 6 is open. The connecting sleeve 6 is fitted onto the rotating column 14 with a gap between it and the rotating column 14. A bracket can be provided on the oil storage cylinder 3. The oil storage cylinder 3 is slidably connected to the bracket. The connecting sleeve 6 moves linearly along the axial direction of the oil storage cylinder 3. The connecting sleeve 6 and the oil storage cylinder 3 are connected by a second... The elastic element is elastically connected, and the extension and retraction direction of the second elastic element is parallel to the movement direction of the connecting sleeve 6. The surface of the connecting sleeve 6 is provided with first protrusions 61 at intervals. The first protrusions 61 are disposed between two arc-shaped plates 141. The surface of the connecting sleeve 6 is rotatably connected with a first rack 62. The rotation axis of the first rack 62 coincides with the axis of the oil storage cylinder 3. The adjusting rod 5 is rotatably provided with a first gear 53. The first gear 53 rotates in one direction. The end of the first rack 62 away from the connecting sleeve 6 meshes with the first gear 53.

[0040] Specifically, the U-shaped steel 13 is pushed by the guide wheel 2 and passes through the roller 1. The first oil-absorbing cotton 11 on the roller 1 rolls and applies oil to the surface of the U-shaped steel 13. For each rotation of the roller 1, the rotating column 14 on the roller 1 rotates once. The arc plate 141 on the rotating column 14 presses the first protrusion 61, causing the connecting sleeve 6 to move. The first rack 62 on the connecting sleeve 6 drives the first gear 53 on the adjusting rod 5 to rotate, thereby causing the adjusting rod 5 to rotate 180°. This causes the lever 321 to move relative to the annular groove 51 and reach the position of the horizontal groove 52, thereby moving the seat 32 on the elastic element. Under the action of the reset, the lever 321 moves relative to the reset, causing the lever 321 to pass through the horizontal groove 52 and reach another annular groove 51. Then, the arc plate 141 on the rotating column 14 moves away from the first protrusion 61, and the connecting sleeve 6 resets under the action of the second elastic element. The first rack 62 drives the first gear 53 on the adjusting rod 5 to rotate. The adjusting rod 5 remains stationary. The above process is repeated so that the moving seat 32 moves a distance of one horizontal groove 52 for each rotation of the roller 1, so that the squeezing roller 4 moves closer to the third oil-absorbing cotton 12, thereby realizing the automatic adjustment of the pressure of the squeezing roller 4 on the third oil-absorbing cotton 12.

[0041] In another embodiment of the present invention, the oil storage cylinder 3 and the guide wheel 2 are connected by a locking member. When the third oil-absorbing cotton 12 is replenished with oil, the locking member is locked. When the guide wheel 2 is driven to rotate, it drives the oil storage cylinder 3 to rotate. When the U-shaped steel 13 is rolled with oil, the locking member is released, causing the oil storage cylinder 3 to separate from the guide wheel 2.

[0042] In another embodiment of the present invention, a positioning pin 7 is slidably connected to the inner wall of the guide wheel 2, and a through hole is opened on the surface of the oil storage cylinder 3. The axis of the through hole and the axis of the positioning pin 7 are on the same straight line. The positioning pin 7 moves linearly along the axis of the through hole. A third elastic element is connected between the positioning pin 7 and the guide wheel 2. The extension and retraction direction of the third elastic element is parallel to the axis of the through hole. The end of the positioning pin 7 away from the guide wheel 2 is inserted into the through hole.

[0043] Specifically, in the initial state, the positioning pin 7 is inserted into the through hole. When the guide wheel 2 rotates, it drives the oil storage cylinder 3 to rotate, which throws out the oil in the oil storage cylinder 3 to replenish the first oil-absorbing cotton 11. When the guide wheel 2 reaches its maximum speed (i.e., the speed from start-up to when it can transmit the U-shaped steel 13), the positioning pin 7 compresses the third elastic element and leaves the through hole under the action of centrifugal force (applicable when the U-shaped steel 13 moves at a sufficiently fast speed, at which time the guide wheel 2 rotates at a relatively fast speed). At this time, the oil storage cylinder 3 loses its driving force and slowly stops under its own resistance. Then, the U-shaped steel 13 begins to be coated with oil by rolling through the roller 1.

[0044] In another embodiment of the present invention, a positioning sleeve 9 is rotatably connected to the inner wall of the guide wheel 2. One end of the positioning sleeve 9 is open, and the positioning pin 7 is slidably inserted into the positioning sleeve 9. An L-shaped groove is formed on the surface of the positioning sleeve 9. A second protrusion 71 is provided at one end of the positioning pin 7. The second protrusion 71 is located in the horizontal section of the L-shaped groove. A first wedge block 81 and a second wedge block 82 are slidably connected to the inner wall of the guide wheel 2. The first wedge block 81 moves linearly along the axial direction of the positioning sleeve 9, and the second wedge block 82 moves linearly along the radial direction of the positioning sleeve 9. A fourth elastic element is connected between the second wedge block 82 and the guide wheel 2. The extension and retraction direction of the fourth elastic element is parallel to the movement direction of the second wedge block 82. A second rack 821 is provided on the second wedge block 82, and a second gear 91 is provided on the positioning sleeve 9. The second rack 821 meshes with the second gear 91.

[0045] Specifically, in the initial state, the positioning pin 7 is inserted into the through hole. When the guide wheel 2 rotates, it drives the oil storage cylinder 3 to rotate, causing the oil in the oil storage cylinder 3 to be thrown out to replenish the first oil-absorbing cotton 11. When the guide wheel 2 reaches its maximum speed, the positioning pin 7, under the action of centrifugal force, compresses the third elastic element, leaves the through hole, and slides in the positioning sleeve 9. At this time, the second protrusion 71 on the positioning pin 7 slides in the horizontal section of the L-shaped groove. When the rotation speed of the guide wheel 2 reaches its maximum, the moving distance of the positioning pin 7 reaches its maximum. At this time, the second protrusion 71 on the positioning pin 7 reaches the vertical section of the L-shaped groove. Under the action of centrifugal force, the first wedge block 81 begins to squeeze the second wedge block 82 to move. The second rack 821 on the second wedge block 82 drives the positioning sleeve 9 to rotate, making... The second protrusion 71 enters the vertical section of the L-shaped groove. At this time, the positioning pin 7 is locked by the second protrusion 71. When the rotation speed of the guide wheel 2 fluctuates, the first wedge block 81 moves with the fluctuation of the rotation speed of the guide wheel 2, so that the second protrusion 71 fluctuates in the vertical section of the L-shaped groove while the positioning pin 7 remains stationary. This prevents the positioning pin 7 from protruding from the first through hole and rubbing against the oil storage cylinder 3 under high-speed rotation, thus improving stability. When the guide wheel 2 starts to stop, the first wedge block 81 is reset under the action of the fourth elastic element and drives the positioning sleeve 9 to rotate, so that the second protrusion 71 re-enters the horizontal section of the L-shaped groove. Then, the positioning pin 7 is reset under the action of the third elastic element and inserted into the second through hole, so that the guide wheel 2 and the oil storage cylinder 3 move synchronously again.

[0046] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A large-size steel pipe forming device, comprising a conveyor belt for conveying U-shaped steel for forming steel pipes with a diameter of not less than 200 mm, characterized in that, Oiling mechanisms are provided on both sides of the conveyor belt. Each oiling mechanism includes a rotatable roller and a first oil-absorbing cotton sleeve on the roller. The first oil-absorbing cotton rolls and applies oil to the U-shaped steel on the conveyor belt. The outer diameter of the U-shaped steel is 200mm; Multiple guide wheels are spaced apart on both sides of the conveyor belt, and the guide wheels are driven to rotate. The roller is coaxially arranged with the guide wheel and is positioned above the guide wheel. An oil storage cylinder is provided inside the roller. The oil storage cylinder is rotatable by a drive. Several oil outlet holes are opened on the surface of the oil storage cylinder. A second oil-absorbing cotton is provided inside the oil storage cylinder. It also includes a third oil-absorbing cotton disposed on the inner wall of the drum. A squeezing roller is movably connected in the annular cavity between the third oil-absorbing cotton and the oil storage cylinder. The squeezing roller is driven to move radially along the oil storage cylinder, thereby changing the squeezing force on the third oil-absorbing cotton.

2. The large-size steel pipe forming device according to claim 1, characterized in that, A movable seat is movably connected to the oil storage cylinder. The extrusion roller is fixed to the movable seat via a connecting rod. A counterweight rod is provided on the side of the movable seat away from the extrusion roller. An adjusting rod is rotatably connected to the oil storage cylinder. Multiple annular grooves are spaced apart on the surface of the adjusting rod. Each pair of annular grooves is connected by a horizontal groove. Adjacent horizontal grooves are spaced 180° apart. A lever is rotatably connected to the movable seat. The lever is perpendicular to the adjusting rod, and the end of the lever away from the movable seat extends into the annular groove.

3. The large-size steel pipe forming device according to claim 2, characterized in that, The drum is equipped with a rotating column, and two arc-shaped plates are fixed at intervals on the rotating column. A connecting sleeve is movably provided above the oil storage cylinder. The surface of the connecting sleeve is provided with first protrusions at intervals. The first protrusions are located between the two arc-shaped plates. A first rack is rotatably connected to the surface of the connecting sleeve. A first gear is rotatably provided on the adjusting rod. The end of the first rack away from the connecting sleeve meshes with the first gear.

4. The large-size steel pipe forming device according to claim 3, characterized in that, The oil storage cylinder and the guide wheel are connected by a locking device.

5. The large-size steel pipe forming device according to claim 1, characterized in that, The guide wheel is slidably connected to a positioning pin on its inner wall. The oil storage cylinder has a through hole on its surface. The axis of the through hole is on the same straight line as the axis of the positioning pin. A third elastic element is connected between the positioning pin and the guide wheel. The end of the positioning pin away from the guide wheel is inserted into the through hole.

6. The large-size steel pipe forming device according to claim 5, characterized in that, A positioning sleeve is rotatably connected to the inner wall of the guide wheel. One end of the positioning sleeve is open, and the positioning pin is slidably inserted into the positioning sleeve. An L-shaped groove is formed on the surface of the positioning sleeve. A second protrusion is provided at one end of the positioning pin. The second protrusion is located in the horizontal section of the L-shaped groove. A first wedge block and a second wedge block are slidably connected to the inner wall of the guide wheel. The first wedge block moves linearly along the axial direction of the positioning sleeve, and the second wedge block moves linearly along the radial direction of the axial direction of the positioning sleeve. A second rack is provided on the second wedge block, and a second gear is provided on the positioning sleeve. The second rack meshes with the second gear.

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