Hot-rolled seamless steel pipe expansion device and expansion process thereof

Abstract

The present invention discloses a hot-rolled seamless steel pipe expansion device and its expansion process, which relates to the technical field of seamless steel pipe processing, including a frame and a positioning assembly, wherein the expansion assembly is arranged at one end of the frame, and the positioning assembly is arranged at the rear of the expansion assembly, and the positioning assembly includes a synchronization rod, a lifting plate, a limit plate, a limit strip, a long hole, a lifting frame, a guide hole, a driving rod and a clamping plate. In the present invention, when the driving seat pulls the expansion head through a pull rod to expand the steel pipe, the driving seat will also drive the limit plate to slide through the synchronization rod and the lifting plate. At this time, since the guide hole on the lifting frame will limit the moving direction of the driving rod so that it can only move vertically, the height of the driving rod can be controlled through the long hole, so that the clamping plate can be used to clamp and position the steel pipe, and the protrusion in the middle of the long hole is located at the expansion head, so the clamping plate located near the expansion head will automatically loosen to prevent the steel pipe from being squeezed by the outside during expansion and affecting the expansion effect.

Description

Technical Field

[0001] The invention relates to the technical field of seamless steel pipe processing, in particular to a diameter expansion device for hot-rolled seamless steel pipe and a diameter expansion process thereof. Background Art

[0002] Seamless steel pipe is made by perforating a whole round steel. There is no weld on the surface of the steel pipe, which is called seamless steel pipe. According to the production method, seamless steel pipe can be divided into hot-rolled seamless steel pipe, cold-rolled seamless steel pipe, cold-drawn seamless steel pipe, extruded seamless steel pipe, jacking pipe, etc. When processing hot-rolled seamless steel pipe, expansion equipment is needed to expand its diameter.

[0003] For example, the invention with the publication number CN110899526B discloses a working method of a diameter expansion device for steel pipe processing. This invention can not only reduce the friction between the diameter expansion head and the steel pipe, but also facilitate loading and unloading. It solves the problem that the diameter expansion head of the current device will have severe friction with the inside of the pipeline, increasing the burden of the power device, and can only load one steel pipe at a time, and the device cannot load and unload during operation. However, in actual use, this type of device only uses the telescopic member to drive the clamping plate to position the steel pipe, and the outer diameter of the steel pipe will change during the processing. Therefore, when expanding the clamping plate, the length of the telescopic member needs to be adjusted. At the same time, during the adjustment process, the steel pipe may be skewed due to looseness, which affects the overall expansion quality.

[0004] Therefore, in view of this, the existing structure and defects are studied and improved, and a diameter expansion device and a diameter expansion process for hot-rolled seamless steel pipe are proposed. Summary of the invention

[0005] The object of the present invention is to provide a hot-rolled seamless steel pipe expansion device and a diameter expansion process thereof to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical scheme: a diameter expansion device for hot-rolled seamless steel pipe and a diameter expansion process thereof, comprising a frame and a positioning assembly, wherein the diameter expansion assembly is arranged at one end of the frame, and the positioning assembly is arranged at the rear of the diameter expansion assembly, and the positioning assembly comprises a synchronization rod, a lifting plate, a limit plate, a limit strip, a long strip hole, a lifting frame, a guide hole, a driving rod and a clamping plate, the rear end of the diameter expansion assembly is connected with a synchronization rod, and the upper and lower outer sides of the synchronization rod are slidably connected with the lifting plate, the end of the lifting plate is fixed with the limit plate, and the upper end of the limit plate is connected with the limit strip, and the inner part of the limit plate is provided with a long strip hole, the cross-section of the limit strip is an isosceles trapezoid, and the outer side of the limit strip is slidably connected with the lifting frame, a guide hole is provided on one side of the lifting frame, and the inner part of the guide hole is slidably connected with the driving rod, the driving rod is slidably connected with the limit plate through the long strip hole, and the end of the driving rod is fixed with a clamping plate.

[0007] Furthermore, the diameter expansion assembly includes a motor, a screw and a drive seat, the motor is fixed to the right part of the frame, the left end of the motor is connected to the screw, and one end of the screw is threadedly connected to the drive seat.

[0008] Furthermore, the expansion assembly also includes a smooth rod, a pull rod and an expansion head. The lower end of the drive seat is slidably connected to the smooth rod, and the smooth rod is fixedly connected to the frame. The upper end of the drive seat is fixedly connected to the pull rod, and the end of the pull rod is sleeved with the expansion head.

[0009] Furthermore, a guide assembly is provided at the front of the other end of the frame, and the guide assembly includes a vertical rod, a horizontal plate and a sliding column. The top of the lifting frame is fixed with a vertical rod, and the outer side of the vertical rod is slidably connected with a horizontal plate, and the horizontal plate is fixedly connected to the frame, and a sliding column is fixed on one side of the limit plate.

[0010] Furthermore, the guide assembly also includes a guide groove, a first baffle and a second baffle. The guide grooves are symmetrically provided at the upper and lower ends of the front of the frame, and one end of the guide groove located at the upper part of the frame is rotatably connected to the first baffle, and the other end of the guide groove located at the lower part of the frame is rotatably connected to the second baffle.

[0011] Furthermore, a connecting assembly is provided at the end of the pull rod, and the connecting assembly includes a drive plate, a connecting rod and a positioning spring. The drive plate is slidably connected to one end of the pull rod, and a connecting rod is fixed to one side of the drive plate. The outer side of the connecting rod is sleeved with a positioning spring, and the positioning spring fits tightly with the pull rod.

[0012] Furthermore, the connecting assembly also includes a rotating plate, a clamping block, a clamping slot and a limiting hole. The end of the connecting rod is connected to the rotating plate, and the end of the rotating plate is rotatably connected to the clamping block, and the clamping block is slidably connected to the pull rod. A clamping slot is opened inside the expanding head, and a limiting hole is opened on one side of the expanding head.

[0013] Furthermore, a placing rack is placed at the lower part of the other end of the frame, and a recovery component is fixed at the middle part of the frame, and the recovery component includes a recovery rack, a limit ring, a slide rod, a compression spring and a retaining ring. The recovery rack is fixed at the lower end of the middle part of the frame, and a limit ring is fixed on one side of the recovery rack. The upper end of the recovery rack is internally slidably connected with a slide rod, and a compression spring is sleeved on the outer side of one end of the slide rod, and a retaining ring is fixed to the end of the slide rod.

[0014] Furthermore, a lubrication assembly is fixed on the top of the driving seat, and the lubrication assembly includes an oil storage tank, a first one-way valve, a piston cylinder, a piston rod, a return spring, a second one-way valve, a connecting pipe and a nozzle. The oil storage tank is fixed on the top of the driving seat, and the first one-way valve is arranged at the bottom of the oil storage tank. The bottom of the first one-way valve is connected to the piston cylinder, and the piston cylinder is fixedly connected to the driving seat. The interior of the piston cylinder is slidably connected to the piston rod, and a return spring is arranged on one side of the piston cylinder. The second one-way valve is arranged on the other side of the piston cylinder, and a connecting pipe is arranged on one side of the second one-way valve. The interior of the connecting pipe is connected to the internal flow channel of the pull rod, and a nozzle is arranged on the outside of the pull rod.

[0015] Furthermore, the diameter expansion process of the hot-rolled seamless steel pipe is applied to the diameter expansion equipment of the hot-rolled seamless steel pipe, comprising the following steps:

[0016] S1: The motor drives the screw to rotate, so that the driving seat moves right along the polished rod. At this time, the driving seat will pull the lifting plate through the synchronous rod, so that the limit plate moves right. In this process, the limit plate will also drive the slide column to slide in the guide groove, and the vertical rod and the horizontal plate will limit the moving direction of the lifting frame. Therefore, when the slide column moves to the right end of the guide groove, the two lifting frames will be separated from each other under the guidance of its inclined surface, so as to facilitate the replacement of steel pipes;

[0017] S2: After placing the seamless steel pipe on the supporting plates on both sides of the lower part of the positioning assembly, the expansion head is placed on the convex column on the placement frame using the limiting holes, and then the motor is started to control the screw to reverse, and the pull rod can be driven through the steel pipe through the driving seat;

[0018] S3: The pull rod will be inserted into the inside of the expansion head on the placement frame. At this time, the inclined surface of the clamping block will be squeezed, so that it will be retracted into the inside of the pull rod end. Then the positioning spring will push the connecting rod, so that the rotating plate will push the clamping block to move into the clamping groove, and the expansion head and the pull rod can be automatically installed and connected. At the same time, the sliding column will slide in the guide groove, thereby driving the two lifting frames to move toward the center, and the steel pipe can be clamped in the center at the same time;

[0019] S4: The driving seat will move toward the recovery frame, so that the piston rod and the recovery frame are squeezed, and the piston rod will slide in the piston cylinder. The lubricating fluid inside the piston cylinder will flow into the flow channel inside the pull rod through the second one-way valve and the connecting pipe, and will be sprayed out from the nozzle to automatically pre-lubricate the inside of the steel pipe;

[0020] S5: When the motor drives the driving seat to move rightward through the screw rod, the reset spring will push the piston rod to reset it. At this time, the lubricating fluid inside the oil storage tank will be replenished into the piston cylinder through the first one-way valve. During this process, the driving seat will pull the expansion head through the pull rod to expand the diameter of the steel pipe. At the same time, the driving seat will also drive the limit plate to slide through the synchronous rod and the lifting plate. Under the limit of the guide hole, the height of the driving rod can be controlled through the long hole, so that the steel pipe can be clamped and positioned by the clamping plate. The raised part in the middle of the long hole is located at the expansion head, so the clamping plate near the expansion head will be automatically loosened.

[0021] S6: When the expanding head moves to the vicinity of the recovery rack, the retaining ring can squeeze the driving plate, so that the connecting rod pulls the card block through the rotating plate to separate it from the card slot, thereby releasing the connection restriction between the expanding head and the pull rod. After that, the limit ring will limit the movement of the expanding head, and as the compression spring contracts, the pull rod can be pulled out of the expanding head, automatically disassembling the expanding head and making it slide into the collection frame on the upper part of the recovery rack, and the two lifting racks will separate from each other to replace the internal steel pipe.

[0022] The present invention provides a hot-rolled seamless steel pipe expansion device and a diameter expansion process thereof, which have the following beneficial effects:

[0023] 1. According to the present invention, when the driving seat pulls the expanding head through the pull rod to expand the diameter of the steel pipe, the driving seat will also drive the limit plate to slide through the synchronous rod and the lifting plate. At this time, the guide hole on the lifting frame will limit the moving direction of the driving rod so that it can only move vertically. Therefore, the height of the driving rod can be controlled through the long hole, so that the clamping plate can be used to clamp and position the steel pipe. The raised portion in the middle of the long hole is located at the expanding head. Therefore, the clamping plate located near the expanding head will be automatically loosened to avoid the steel pipe being squeezed by the outside during expansion and affecting the expansion effect. After expansion, since the heights of the two sides of the raised portion of the long hole are inconsistent, it can automatically adapt to the size after expansion when re-clamping to avoid deformation of the steel pipe caused by excessive pressure, thereby improving the stability of the steel pipe during expansion.

[0024] 2. In the process of movement of the limit plate, the present invention will also drive the sliding column to slide in the guide groove. At the same time, the limit plate is slidably connected to the lifting frame through the limit strip. At the same time, the vertical rod and the horizontal plate will limit the moving direction of the lifting frame so that it can only move vertically. Therefore, when the limit plate moves horizontally, the height of the lifting frame will not be changed. Only when the limit plate moves vertically will the height of the lifting frame be changed. Therefore, after the diameter is expanded, when the sliding column moves to the right end of the guide groove, the two lifting frames will be separated from each other under the guidance of its inclined surface, so as to facilitate the removal of the internal steel pipe for unloading. After the material is replaced, when the driving seat drives the pull rod to pass When a new steel pipe is inserted, the first baffle will rotate to a horizontal state under the action of gravity, and will support and limit the sliding column, so that the sliding column can move horizontally, and after moving to the left, it will move downward under the action of gravity. At this time, the sliding column at the bottom will push the second baffle to rotate it, and when it is located to the left of the second baffle, the second baffle will block the bottom of the sliding column, so that before the diameter is expanded, the two lifting frames can be driven to move toward the center through the guide groove, so that the steel pipe can be clamped in the center at the same time, so that the force is evenly distributed, and the pipeline can be prevented from being skewed due to the small force surface at the beginning of clamping.

[0025] 3. When expanding the diameter of a seamless steel pipe, the present invention uses a pull rod to pull the expansion head to expand the inside of the steel pipe. Compared with the existing method of pushing the expansion head into the steel pipe and then pulling it out, the travel of the expansion head inside the steel pipe can be reduced, thereby reducing the wear on the inside of the steel pipe. Before expanding the diameter, the expansion head can be placed on the convex column on the placement frame using the limiting hole. Therefore, when the driving seat drives the pull rod to pass through the steel pipe, it will be inserted into the inside of the expansion head. At this time, the inclined surface of the clamping block will be squeezed, causing it to retract into the inside of the pull rod end head. Then the positioning spring will push the connecting rod, so that the rotating plate pushes the clamping block to move into the clamping groove, and the expansion head and The pull rods are installed and connected, and after the seamless steel pipe is expanded, when the expanding head moves to the vicinity of the recovery rack, since the elastic force of the compression spring is greater than the elastic force of the positioning spring, the retaining ring can squeeze the driving plate, so that the connecting rod pulls the card block through the rotating plate to separate it from the card slot, thereby releasing the connection restriction between the expanding head and the pull rod, and then the limit ring will limit the movement of the expanding head, and as the compression spring contracts, the pull rod can be pulled out of the expanding head, automatically disassembling the expanding head and making it slide into the collection frame on the upper part of the recovery rack, thereby eliminating the need to manually disassemble and assemble the expanding head, which is beneficial to improving processing efficiency.

[0026] 4. In the present invention, when the pull rod moves toward the placement rack, the drive seat will also move toward the recovery rack, so that the piston rod and the recovery rack are squeezed, and the piston rod will slide in the piston cylinder, so that the internal pressure will increase, and the lubricating fluid inside the piston cylinder will flow into the flow channel inside the pull rod through the second one-way valve and the connecting pipe, and be sprayed out from the nozzle, so that during the automatic assembly of the pull rod and the expansion head, the inside of the steel pipe can also be lubricated to reduce the wear of the steel pipe during the expansion process, and when the drive seat moves to the right, the reset spring will push the piston rod to reset it, and at this time the lubricating fluid inside the oil storage tank will be replenished into the piston cylinder through the first one-way valve for subsequent reuse. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall three-dimensional structure of a hot-rolled seamless steel pipe expansion device according to the present invention;

[0028] Figure 2 It is a schematic diagram of the three-dimensional structure of a frame of a hot-rolled seamless steel pipe expansion device according to the present invention;

[0029] Figure 3 It is a rear perspective structural schematic diagram of a limit plate of a hot-rolled seamless steel pipe expansion device according to the present invention;

[0030] Figure 4 It is a schematic diagram of the three-dimensional structure of a lifting frame of a hot-rolled seamless steel pipe expansion device according to the present invention;

[0031] Figure 5 It is a schematic cross-sectional structure diagram of a connection assembly of a hot-rolled seamless steel pipe expansion device according to the present invention;

[0032] Figure 6 It is a schematic diagram of the three-dimensional structure of a recovery frame of a hot-rolled seamless steel pipe expansion device of the present invention;

[0033] Figure 7 The present invention is a schematic diagram of the three-dimensional structure of the lubrication component part of the hot-rolled seamless steel pipe expansion equipment.

[0034] In the figure: 1, frame; 2, expansion assembly; 201, motor; 202, screw; 203, drive seat; 204, light rod; 205, pull rod; 206, expansion head; 3, positioning assembly; 301, synchronization rod; 302, lifting plate; 303, limit plate; 304, limit strip; 305, long hole; 306, lifting frame; 307, guide hole; 308, drive rod; 309, clamp; 4, guide assembly; 401, vertical rod; 402, horizontal plate; 403, slide column; 404, guide groove; 405, first baffle; 406, second baffle Plate; 5. Connecting assembly; 501. Driving plate; 502. Connecting rod; 503. Positioning spring; 504. Rotating plate; 505. Block; 506. Slot; 507. Limiting hole; 6. Placement rack; 7. Recovery assembly; 701. Recovery rack; 702. Limiting ring; 703. Sliding rod; 704. Compression spring; 705. Retaining ring; 8. Lubrication assembly; 801. Oil storage tank; 802. First one-way valve; 803. Piston cylinder; 804. Piston rod; 805. Return spring; 806. Second one-way valve; 807. Connecting pipe; 808. Spray nozzle. DETAILED DESCRIPTION

[0035] See also Figures 1 to 7 The present invention provides a technical solution: a hot-rolled seamless steel pipe expansion device and an expansion process thereof, comprising a frame 1 and a positioning assembly 3, an expansion assembly 2 is arranged at one end of the frame 1, the positioning assembly 3 is arranged at the rear of the expansion assembly 2, the positioning assembly 3 comprises a synchronization rod 301, a lifting plate 302, a limit plate 303, a limit bar 304, a long hole 305, a lifting frame 306, a guide hole 307, a driving rod 308 and a clamping plate 309, the rear end of the expansion assembly 2 is connected with the synchronization rod 301, and the upper and lower ends of the synchronization rod 301 are slidably connected to the outer sides thereof. 02, a limiting plate 303 is fixed at the end of the lifting plate 302, and the upper end of the limiting plate 303 is connected to the limiting strip 304, and a long hole 305 is opened inside the limiting plate 303, the cross-section of the limiting strip 304 is an isosceles trapezoid, and the outer side of the limiting strip 304 is slidably connected to a lifting frame 306, a guide hole 307 is opened on one side of the lifting frame 306, and a driving rod 308 is slidably connected inside the guide hole 307, the driving rod 308 is slidably connected to the limiting plate 303 through the long hole 305, and a clamping plate 309 is fixed to the end of the driving rod 308.

[0036] See also Figures 1 to 4The expansion assembly 2 includes a motor 201, a screw 202 and a drive seat 203. The motor 201 is fixed to the right part of the frame 1, and the left end of the motor 201 is connected to the screw 202, and one end of the screw 202 is threadedly connected to the drive seat 203. The expansion assembly 2 also includes a light rod 204, a pull rod 205 and an expansion head 206. The lower end of the drive seat 203 is internally slidably connected with the light rod 204, and the light rod 204 is fixedly connected to the frame 1. The upper end of the drive seat 203 is internally fixedly connected with the pull rod 205, and the end of the pull rod 205 is sleeved with the expansion head 206. The front part of the other end of the frame 1 is provided with a guide assembly 4, and the guide assembly 4 The guide assembly 4 comprises a vertical rod 401, a horizontal plate 402 and a sliding column 403. The vertical rod 401 is fixed on the top of the lifting frame 306, and the horizontal plate 402 is slidably connected to the outer side of the vertical rod 401, and the horizontal plate 402 is fixedly connected to the frame 1. The sliding column 403 is fixed to one side of the limit plate 303. The guide assembly 4 also comprises a guide groove 404, a first baffle 405 and a second baffle 406. The guide grooves 404 are symmetrically provided at the upper and lower ends of the front of the frame 1, and one end of the guide groove 404 located at the upper part of the frame 1 is internally rotatably connected to the first baffle 405, and the other end of the guide groove 404 located at the lower part of the frame 1 is internally rotatably connected to the second baffle 406;

[0037] The specific operation is as follows: the motor 201 drives the screw rod 202 to rotate, so that the driving seat 203 moves right along the light rod 204, and the driving seat 203 will pull the lifting plate 302 through the synchronous rod 301, so that the limit plate 303 moves right. In this process, the limit plate 303 will also drive the slide column 403 to slide in the guide groove 404. At the same time, the limit plate 303 is slidably connected to the lifting frame 306 through the limit bar 304, and the vertical rod 401 and the horizontal plate 402 will limit the moving direction of the lifting frame 306. Therefore, when the slide column 403 moves to the right end of the guide groove 404, the two lifting frames 306 will be relative to each other under the guidance of its inclined surface. They are separated from each other, so as to facilitate the replacement of steel pipes. After the seamless steel pipe is placed on the support plates on both sides of the lower part of the positioning component 3, the motor 201 is started to control the screw 202 to reverse, so that the pull rod 205 can be driven through the inside of the steel pipe through the driving seat 203. In this process, since the first baffle plate 405 will rotate to a horizontal state under the action of gravity, the sliding column 403 will be supported and limited, so that the sliding column 403 can move horizontally, and after moving to the left, it will move downward under the action of gravity. At this time, the sliding column 403 located at the bottom will push the second baffle plate 406 to rotate it, and when the sliding column 403 is located on the left side of the second baffle plate 406 After that, the second baffle plate 406 will block the bottom of the sliding column 403, so that before the diameter is expanded, the two lifting frames 306 can be driven to move toward the center through the guide groove 404, so that the steel pipe can be clamped in the center at the same time, so that the force is evenly applied, and the pipe is prevented from being skewed due to the small force surface at the beginning of clamping. Afterwards, when the motor 201 drives the driving seat 203 to move right through the screw rod 202, the driving seat 203 will pull the diameter expanding head 206 through the pull rod 205 to expand the diameter of the steel pipe. At the same time, the driving seat 203 will also drive the limit plate 303 to slide through the synchronous rod 301 and the lifting plate 302. At this time, due to the lifting frame 306 The guide hole 307 on the strip hole 305 will limit the moving direction of the driving rod 308 so that it can only move vertically. Therefore, the height of the driving rod 308 can be controlled through the long hole 305, so that the clamping plate 309 can be used to clamp and position the steel pipe. The raised portion in the middle of the long hole 305 is located at the expanding head 206. Therefore, the clamping plate 309 located near the expanding head 206 will automatically loosen to prevent the steel pipe from being squeezed by the outside during expansion and affecting the expansion effect. After expansion, since the heights of the two sides of the raised portion of the long hole 305 are inconsistent, it can automatically adapt to the size after expansion when re-clamping to prevent the steel pipe from being deformed due to excessive pressure.

[0038] See also Figure 2 , Figures 5 to 7, a connecting assembly 5 is provided at the end of the pull rod 205, and the connecting assembly 5 includes a driving plate 501, a connecting rod 502 and a positioning spring 503. The driving plate 501 is slidably connected to one end of the pull rod 205, and a connecting rod 502 is fixed to one side of the driving plate 501. The outer side of the connecting rod 502 is sleeved with a positioning spring 503, and the positioning spring 503 is tightly fitted with the pull rod 205. The connecting assembly 5 also includes a rotating plate 504, a block 505, a slot 506 and a limiting hole 507. The end of the connecting rod 502 is connected to the rotating plate 504, and the rotating The end of the plate 504 is rotatably connected with a block 505, and the block 505 is slidably connected with the pull rod 205. A card slot 506 is provided inside the enlarging head 206, and a limiting hole 507 is provided on one side of the enlarging head 206. A placing rack 6 is arranged at the lower part of the other end of the frame 1, and a recovery component 7 is fixed in the middle of the frame 1. The recovery component 7 includes a recovery rack 701, a limiting ring 702, a slide bar 703, a compression spring 704 and a retaining ring 705. A recovery rack 701 is fixed at the lower end of the middle of the frame 1, and a limiting ring is fixed on one side of the recovery rack 701. 702, a sliding rod 703 is slidably connected to the upper end of the recovery frame 701, and a compression spring 704 is sleeved on the outer side of one end of the sliding rod 703, and a retaining ring 705 is fixed to the end of the sliding rod 703, and a lubrication assembly 8 is fixed on the top of the drive seat 203, and the lubrication assembly 8 includes an oil storage tank 801, a first one-way valve 802, a piston cylinder 803, a piston rod 804, a return spring 805, a second one-way valve 806, a connecting pipe 807 and a nozzle 808, and an oil storage tank 801 is fixed on the top of the drive seat 203, and the bottom of the oil storage tank 801 A first one-way valve 802 is arranged, a piston cylinder 803 is connected to the bottom of the first one-way valve 802, and the piston cylinder 803 is fixedly connected to the driving seat 203, a piston rod 804 is slidably connected inside the piston cylinder 803, and a return spring 805 is arranged on one side of the piston cylinder 803, a second one-way valve 806 is arranged on the other side of the piston cylinder 803, and a connecting pipe 807 is arranged on one side of the second one-way valve 806, the interior of the connecting pipe 807 is connected to the internal flow channel of the pull rod 205, and a nozzle 808 is arranged on the outside of the pull rod 205;

[0039] The specific operation is as follows: before the diameter expansion, the diameter expansion head 206 can be placed on the convex column on the placement frame 6 by using the limiting hole 507. When the starting motor 201 controls the driving seat 203 to drive the pull rod 205 to pass through the steel pipe, the pull rod 205 will be inserted into the inside of the diameter expansion head 206 on the placement frame 6. At this time, the inclined surface of the block 505 will be squeezed, so that it will retract into the inside of the end of the pull rod 205. Then the positioning spring 503 will push the connecting rod 502, so that the rotating plate 504 pushes the block 505 to move into the card slot 506, which can automatically align the diameter expansion head 206 with the pull rod 2 05, during this process, the drive seat 203 will also move toward the recovery frame 701, so that the piston rod 804 and the recovery frame 701 are squeezed, and the piston rod 804 will slide in the piston cylinder 803, so that the internal pressure will increase, and the lubricating fluid in the piston cylinder 803 will flow into the flow channel inside the pull rod 205 through the second one-way valve 806 and the connecting pipe 807, and be sprayed out from the nozzle 808, so that during the automatic assembly of the pull rod 205 and the expansion head 206, the inside of the steel pipe can also be pre-lubricated to reduce the expansion of the steel pipe. When the motor 201 drives the driving seat 203 to move rightward through the screw 202, the reset spring 805 pushes the piston rod 804 to reset it. At this time, the lubricating fluid inside the oil storage tank 801 is replenished into the piston cylinder 803 through the first one-way valve 802 for subsequent reuse. When the enlarging head 206 moves to the vicinity of the recovery frame 701, since the elastic force of the compression spring 704 is greater than the elastic force of the positioning spring 503, the retaining ring 705 can squeeze the driving plate 501, so that the connecting rod 502 pulls the block 504 through the rotating plate 504. 05, so that it is separated from the slot 506, the connection restriction between the expanding head 206 and the pull rod 205 can be released, and then the limit ring 702 will limit the movement of the expanding head 206, and with the contraction of the compression spring 704, the pull rod 205 can be withdrawn from the expanding head 206, and the expanding head 206 is automatically disassembled to slide into the collection frame on the upper part of the recovery frame 701, thereby eliminating the need for manual disassembly and assembly of the expanding head 206, which is beneficial to improving the efficiency during processing, and the two lifting frames 306 will separate from each other to replace the internal steel pipe.

[0040] In summary, when the hot-rolled seamless steel pipe expansion device and its expansion process are used, the motor 201 first drives the screw rod 202 to rotate, so that the driving seat 203 moves to the right along the light rod 204. At this time, the driving seat 203 will pull the lifting plate 302 through the synchronous rod 301, so that the limit plate 303 moves to the right. In this process, the limit plate 303 will also drive the sliding column 403 to slide in the guide groove 404. At the same time, the limit plate 303 is slidably connected with the lifting frame 306 through the limit bar 304, and the vertical rod 401 and the horizontal plate 402 will limit the moving direction of the lifting frame 306. Therefore, when the sliding column 403 moves to the right end of the guide groove 404, the two lifting frames 306 will be separated from each other under the guidance of its inclined surface, thereby facilitating the replacement of steel pipes. Secondly, after placing the seamless steel pipe on the support plates on both sides of the lower part of the positioning component 3, and using the limiting hole 507 to place the expanding head 206 on the convex column on the placement frame 6, and then starting the motor 201 to control the screw 202 to reverse, the pull rod 205 can be driven through the interior of the steel pipe through the driving seat 203. During this process, the first baffle plate 405 will rotate to a horizontal state under the action of gravity, and will support and limit the sliding column 403, so that the sliding column 403 can move horizontally, and after moving to the left, it will move downward under the action of gravity. At this time, the sliding column 403 located at the bottom will push the second baffle plate 406 to rotate it, and when the sliding column 403 is located on the left side of the second baffle plate 406, the second baffle plate 406 will block the bottom of the sliding column 403, thereby expanding the diameter. The two lifting frames 306 can be driven to move toward the center through the guide groove 404, so that the steel pipe can be clamped in the center at the same time. Then, the pull rod 205 will be inserted into the inside of the enlarged head 206 on the placement frame 6. At this time, the inclined surface of the clamping block 505 will be squeezed, so that it will be retracted into the end of the pull rod 205. After that, the positioning spring 503 will push the connecting rod 502, so that the rotating plate 504 pushes the clamping block 505 to move into the clamping groove 506, which can automatically install and connect the enlarged head 206 and the pull rod 205. In this process, the driving seat 203 will also move toward the recovery frame 701, so that the piston rod 804 and the recovery frame 701 are squeezed, and the piston rod 804 will slide in the piston cylinder 803, and the lubricating fluid inside the piston cylinder 803 will The lubricant in the oil tank 801 will be replenished into the piston cylinder 803 through the first one-way valve 802. During this process, the drive seat 203 will pull the expansion head 206 through the pull rod 205 to expand the diameter of the steel pipe. At the same time, the drive seat 203 will also drive the limit plate 303 to slide through the synchronization rod 301 and the lifting plate 302. At this time, the guide hole 307 on the lifting frame 306 will limit the moving direction of the drive rod 308.Therefore, the height of the driving rod 308 can be controlled through the long hole 305, so that the clamping plate 309 can be used to clamp and position the steel pipe, and the protrusion in the middle of the long hole 305 is located at the expansion head 206, so the clamping plate 309 near the expansion head 206 will automatically loosen. Finally, after the seamless steel pipe is expanded, when the expansion head 206 moves to the vicinity of the recovery frame 701, the retaining ring 705 can squeeze the driving plate 501, so that the connecting rod 502 pulls the rotating plate 504. The clamping block 505 is released from the clamping slot 506, and the connection restriction between the enlarging head 206 and the pull rod 205 can be released. Then the limit ring 702 will limit the movement of the enlarging head 206, and as the compression spring 704 contracts, the pull rod 205 can be pulled out from the enlarging head 206, and the enlarging head 206 is automatically disassembled and slides into the collection frame on the upper part of the recovery frame 701, and the two lifting frames 306 will separate from each other so that the internal steel pipe can be replaced.

[0041] The embodiments of the present invention are given for the purpose of illustration and description, and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

Claims

1. A hot-rolled seamless steel pipe expansion device, characterized in that: The invention comprises a frame (1) and a positioning assembly (3), wherein a diameter expansion assembly (2) is arranged at one end of the frame (1), the positioning assembly (3) is arranged at the rear of the diameter expansion assembly (2), the positioning assembly (3) comprises a synchronization rod (301), a lifting plate (302), a limit plate (303), a limit strip (304), a long hole (305), a lifting frame (306), a guide hole (307), a driving rod (308) and a clamping plate (309), the rear end of the diameter expansion assembly (2) is connected to the synchronization rod (301), and the synchronization rod (301) is connected to the rear end of the diameter expansion assembly (2). The upper and lower ends of the lifting plate (301) are slidably connected to the outer sides thereof with a lifting plate (302), a limiting plate (303) is fixed to the end of the lifting plate (302), and the upper end of the limiting plate (303) is connected to the limiting strip (304), and a long hole (305) is provided inside the limiting plate (303), the cross section of the limiting strip (304) is an isosceles trapezoid, and the outer side of the limiting strip (304) is slidably connected to a lifting frame (306), and a guide hole (307) is provided on one side of the lifting frame (306), and the guide hole (307) is provided on the inner side thereof. A driving rod (308) is slidably connected inside, and the driving rod (308) is slidably connected to the limit plate (303) through the long hole (305), and a clamping plate (309) is fixed to the end of the driving rod (308). A guide assembly (4) is arranged at the front of the other end of the frame (1), and the guide assembly (4) includes a vertical rod (401), a horizontal plate (402), a sliding column (403), a guide groove (404), a first baffle (405) and a second baffle (406). A vertical rod (401) is fixed to the top of the lifting frame (306). The frame (1) is provided with a plurality of guide grooves (404) which are symmetrically arranged at the upper and lower ends of the front part of the frame (1), and a first baffle (405) is rotatably connected to one end of the guide groove (404) located at the upper part of the frame (1), and a second baffle (406) is rotatably connected to the other end of the guide groove (404) located at the lower part of the frame (1).

2. The hot-rolled seamless steel pipe expansion device according to claim 1, characterized in that: The diameter expansion assembly (2) comprises a motor (201), a screw rod (202) and a drive seat (203); the motor (201) is fixed to the right part of the frame (1), the left end of the motor (201) is connected to the screw rod (202), and one end of the screw rod (202) is threadedly connected to the drive seat (203).

3. The hot-rolled seamless steel pipe expansion device according to claim 2, characterized in that: The expansion assembly (2) further comprises a smooth rod (204), a pull rod (205) and an expansion head (206); the lower end of the drive seat (203) is internally slidably connected with the smooth rod (204), and the smooth rod (204) is fixedly connected to the frame (1); the upper end of the drive seat (203) is internally fixedly connected with the pull rod (205), and the end of the pull rod (205) is sleeved with the expansion head (206).

4. The hot-rolled seamless steel pipe expansion device according to claim 3, characterized in that: A connecting assembly (5) is provided at the end of the pull rod (205), and the connecting assembly (5) includes a driving plate (501), a connecting rod (502) and a positioning spring (503). One end of the pull rod (205) is internally slidably connected to the driving plate (501), and a connecting rod (502) is fixed to one side of the driving plate (501). The outer side of the connecting rod (502) is sleeved with a positioning spring (503), and the positioning spring (503) is tightly fitted with the pull rod (205).

5. The hot-rolled seamless steel pipe expansion device according to claim 4, characterized in that: The connecting assembly (5) further comprises a rotating plate (504), a clamping block (505), a clamping slot (506) and a limiting hole (507); the end of the connecting rod (502) is connected to the rotating plate (504), and the end of the rotating plate (504) is rotatably connected to the clamping block (505), and the clamping block (505) is slidably connected to the pull rod (205); the inside of the expanding head (206) is provided with a clamping slot (506), and one side of the expanding head (206) is provided with a limiting hole (507).

6. The hot-rolled seamless steel pipe expansion device according to claim 1, characterized in that: A placing rack (6) is arranged at the lower part of the other end of the frame (1), and a recovery component (7) is fixed at the middle part of the frame (1), wherein the recovery component (7) comprises a recovery rack (701), a limiting ring (702), a sliding rod (703), a compression spring (704) and a retaining ring (705). The recovery rack (701) is fixed at the lower end of the middle part of the frame (1), and a limiting ring (702) is fixed on one side of the recovery rack (701). The upper end of the recovery rack (701) is internally slidably connected with a sliding rod (703), and a compression spring (704) is sleeved on the outer side of one end of the sliding rod (703), and a retaining ring (705) is fixed at the end of the sliding rod (703).

7. The hot-rolled seamless steel pipe expansion device according to claim 2, characterized in that: A lubrication assembly (8) is fixed on the top of the drive seat (203), and the lubrication assembly (8) comprises an oil storage tank (801), a first one-way valve (802), a piston cylinder (803), a piston rod (804), a return spring (805), a second one-way valve (806), a connecting pipe (807) and a nozzle (808). The oil storage tank (801) is fixed on the top of the drive seat (203), and the first one-way valve (802) is arranged at the bottom of the oil storage tank (801), and the bottom of the first one-way valve (802) is connected to the piston cylinder (803). 03), and the piston cylinder (803) is fixedly connected to the driving seat (203), the interior of the piston cylinder (803) is slidably connected to the piston rod (804), and a return spring (805) is provided on one side of the piston cylinder (803), a second one-way valve (806) is arranged on the other side of the piston cylinder (803), and a connecting pipe (807) is provided on one side of the second one-way valve (806), the interior of the connecting pipe (807) is connected to the internal flow channel of the pull rod (205), and a nozzle (808) is provided on the outside of the pull rod (205).

8. A process for expanding the diameter of a hot-rolled seamless steel pipe, characterized in that: The diameter expansion device applied to the hot-rolled seamless steel pipe according to any one of claims 1 to 7 comprises the following steps: S1: The motor (201) drives the screw rod (202) to rotate, so that the driving seat (203) moves rightward along the light rod (204). At this time, the driving seat (203) will pull the lifting plate (302) through the synchronous rod (301), so that the limit plate (303) moves rightward. In this process, the limit plate (303) will also drive the sliding column (403) to slide in the guide groove (404), and the vertical rod (401) and the horizontal plate (402) will limit the moving direction of the lifting frame (306). Therefore, when the sliding column (403) moves to the right end of the guide groove (404), the two lifting frames (306) will be separated from each other under the guidance of its inclined surface, so as to facilitate the replacement of steel pipes; S2: After placing the seamless steel pipe on the supporting plates at both sides of the lower part of the positioning assembly (3), the expansion head (206) is placed on the convex column on the placement frame (6) using the limiting hole (507), and then the motor (201) is started to control the screw rod (202) to reverse, so that the pull rod (205) can be driven through the interior of the steel pipe through the driving seat (203); S3: The pull rod (205) will be inserted into the inside of the enlarging head (206) on the placement frame (6). At this time, the inclined surface of the clamping block (505) will be squeezed, so that it will be retracted into the inside of the end of the pull rod (205). Then, the positioning spring (503) will push the connecting rod (502), so that the rotating plate (504) pushes the clamping block (505) to move into the clamping groove (506), and the enlarging head (206) and the pull rod (205) can be automatically installed and connected. At the same time, the sliding column (403) will slide in the guide groove (404), thereby driving the two lifting frames (306) to move toward the center, so that the steel pipe can be clamped in the center at the same time; S4: The driving seat (203) moves toward the recovery frame (701), causing the piston rod (804) and the recovery frame (701) to be squeezed, and the piston rod (804) slides in the piston cylinder (803). The lubricating fluid in the piston cylinder (803) flows into the flow channel inside the pull rod (205) through the second one-way valve (806) and the connecting pipe (807), and is sprayed out from the nozzle (808), automatically pre-lubricating the inside of the steel pipe; S5: When the motor (201) drives the drive seat (203) to move rightward through the screw rod (202), the return spring (805) pushes the piston rod (804) to return it to its original position. At this time, the lubricating fluid in the oil storage tank (801) is replenished into the piston cylinder (803) through the first one-way valve (802). During this process, the drive seat (203) pulls the expansion head (206) through the pull rod (205) to expand the diameter of the steel pipe. At the same time, the drive seat (203) ) will also drive the limiting plate (303) to slide through the synchronous rod (301) and the lifting plate (302), and under the limit of the guide hole (307), the height of the driving rod (308) can be controlled through the long hole (305), so that the clamping plate (309) can be used to clamp and position the steel pipe, and the protrusion in the middle of the long hole (305) is located at the expansion head (206), so the clamping plate (309) located near the expansion head (206) will automatically loosen; S6: When the expanding head (206) moves to the vicinity of the recovery rack (701), the retaining ring (705) can squeeze the driving plate (501), so that the connecting rod (502) pulls the block (505) through the rotating plate (504) to separate it from the slot (506), thereby releasing the connection restriction between the expanding head (206) and the pull rod (205). After that, the limiting ring (702) will limit the movement of the expanding head (206), and as the compression spring (704) contracts, the pull rod (205) can be pulled out of the expanding head (206), automatically disassembling the expanding head (206) and making it slide into the collection frame on the upper part of the recovery rack (701), and the two lifting racks (306) will separate from each other so that the internal steel pipe can be replaced.

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