Oil casing hot rolling production device and production process

Abstract

The application discloses a kind of oil bushing hot rolling production device and production process, it includes limiting component and roller pressing component, the limiting component includes first fixed ring, fixed rod, first telescopic rod, movable block and second fixed ring, the fixed rod both ends are respectively fixedly connected first fixed ring and second fixed ring, first fixed ring and second fixed ring inner wall are respectively fixedly connected first telescopic rod one end, first telescopic rod other end is fixedly connected movable block, first telescopic rod and movable block are provided with three groups, and are respectively annular array setting in first fixed ring and second fixed ring inside;The roller pressing component includes rotating shaft, support seat, movable arm and press roll;Rotating shaft rotation 120 ° can replace the press roll contacted with oil bushing, without stopping machine and then installing new press roll after old press roll is disassembled, it is favorable to save the time of replacing press roll, avoid affecting production efficiency, and the roller pressing component structure is compact, can realize lateral roll replacement.

Description

Technical Field

[0001] This invention relates to the field of hot continuous rolling production technology for oil casing and tubing, and in particular to a hot continuous rolling production apparatus and process for oil casing and tubing. Background Technology

[0002] In recent years, with the development of petroleum industry technology, especially the development of shale gas extraction technology in the United States, the development of shale gas oil fields has received increasing attention. A large number of shale gas oil fields also exist in southwestern my country. As a crucial support component for shale gas oil wells, oil well casing requires strict standards for material strength, toughness, and corrosion resistance. Traditionally, most oil well casing is made of seamless steel pipe, combined with heat treatment to improve strength.

[0003] Currently, PQF continuous rolling mills are generally used to produce oil casing. The three transmission systems of the PQF continuous rolling mill, which are 120° apart, occupy the space around the mill. The traditional side-mounted roll changing method is difficult to use. The rolls can only be changed from the axial direction, i.e., the direction of the rolling line. This requires stopping the machine to remove the old rolls and then installing the new rolls, which consumes a lot of time and affects production efficiency. Summary of the Invention

[0004] The technical problem to be solved by this invention is that the three transmission systems of the PQF continuous rolling mill, which are 120° apart, occupy the space around the mill. The traditional side-mounted roll changing method is difficult to use. The rolls can only be changed from the axial direction, i.e. the direction of the rolling line. This requires stopping the machine to remove the old rolls and then installing the new rolls, which consumes a lot of time and affects production efficiency.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a hot continuous rolling production device for oil casing, comprising a limiting assembly and a rolling assembly. The limiting assembly includes a first fixed ring, a fixed rod, a first telescopic rod, a movable block, and a second fixed ring. The first fixed ring and the second fixed ring are respectively fixedly connected to both ends of the fixed rod. One end of the first telescopic rod is fixedly connected to the inner wall of the first fixed ring and the second fixed ring, and the movable block is fixedly connected to the other end of the first telescopic rod. Three sets of the first telescopic rod and the movable block are arranged in a circular array inside the first fixed ring and the second fixed ring. The rolling assembly includes a rotating shaft, a support seat, a movable arm, and a pressure roller. The movable block is rotatably connected to both ends of the rotating shaft. The rotating shaft is fixedly connected to the support seat. One end of the movable arm is slidably connected to the inner wall of both ends of the support seat. The pressure roller is rotatably connected to the other end of the movable arm. Three sets of the support seat, the movable arm, and the pressure roller are arranged in a circular array on the rotating shaft.

[0006] As a preferred embodiment of the hot continuous rolling production apparatus for oil casing and tubing of the present invention, it further includes a control component, which includes a gear, a toothed plate, a support plate, a first fixed block, a second fixed block, and a second telescopic rod. The gear is fixedly connected to a rotating shaft, meshes with the toothed plate, is fixedly connected to the support plate, the support plate is fixedly connected to the first fixed block, the first fixed block is fixedly connected to one end of the second telescopic rod, the other end of the second telescopic rod is fixedly connected to the second fixed block, and the second fixed block is fixedly connected to a movable block.

[0007] In a preferred embodiment of the hot continuous rolling production apparatus for oil casing and tubing of the present invention, the support plate is fixedly connected to a third fixing block, the third fixing block is fixedly connected to a pin shaft, the rotating shaft is provided with pin holes corresponding to the pin shaft, there are three pin holes, and they are respectively arranged in a circular array on the rotating shaft.

[0008] As a preferred embodiment of the hot continuous rolling production device for oil casing and tubing of the present invention, the gear is provided with a receiving cavity, one end of a spring is fixedly connected to the inner end wall of the receiving cavity, the other end of the spring is fixedly connected to a locking block, the locking block is slidably connected to the inner wall of the receiving cavity, the locking block is provided with an inclined surface, and a locking groove is provided on the rotating shaft corresponding to the locking block.

[0009] As a preferred embodiment of the hot continuous rolling production apparatus for oil casing and tubing of the present invention, wherein: the movable arm is threadedly connected to a bidirectional lead screw, and a square groove is provided at one end of the bidirectional lead screw.

[0010] In a preferred embodiment of the hot continuous rolling production apparatus for oil casing and tubing of the present invention, the control component further includes a control cylinder, which is connected to a first telescopic rod via a first connecting pipe and to a second telescopic rod via a second connecting pipe.

[0011] As a preferred embodiment of the hot continuous rolling production apparatus for oil casing and tubing of the present invention, wherein: one end of the cylinder is fixedly connected to the inner end wall of the control cylinder, the other end of the cylinder is fixedly connected to the first piston head, and the first piston head is slidably connected to the inner wall of the control cylinder.

[0012] In a preferred embodiment of the hot continuous rolling production apparatus for oil casing and tubing of the present invention, the first telescopic rod includes a fixed cylinder, a movable rod, and a second piston head. The outer end of the fixed cylinder is fixedly connected to the inner wall of the first fixed ring or the second fixed ring. The inner wall of the fixed cylinder is slidably connected to the second piston head. The second piston head is fixedly connected to one end of the movable rod. The movable rod passes through the fixed cylinder, and the other end of the movable rod is fixedly connected to a movable block. The fixed cylinder is connected to the first connecting pipe.

[0013] In a preferred embodiment of the hot continuous rolling production apparatus for oil casing and tubing of the present invention, a ratchet is fixedly connected to the rotating shaft, the ratchet is engaged with a ratchet tooth, the ratchet tooth is fixedly connected to one end of an elastic plate, and the other end of the elastic plate is fixedly connected to a movable block.

[0014] A hot continuous rolling process for oil casing includes passing the oil casing through the limiting holes between movable blocks to the rolling assembly; controlling the rotation of the pressure rollers to hot-press the oil casing; controlling the rotating shaft to rotate 120° to replace the pressure roller in contact with the oil casing; controlling the movable arm to move to the outer end of the support seat to remove the old pressure roller and replace it with a new pressure roller; and controlling the movable arm to move to the center of the support seat to complete the replacement of the pressure roller.

[0015] The beneficial effects of the present invention are as follows: In the present invention, the pressure roller in contact with the oil sleeve can be replaced by rotating the rotating shaft by 120° without stopping the machine to remove the old pressure roller and then install the new pressure roller, which helps to save the time of replacing the pressure roller and avoid affecting the production efficiency. Moreover, the roller pressing assembly has a compact structure and can realize lateral roller changing. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure in an embodiment of this disclosure.

[0017] Figure 2 This is a partial structural diagram of an embodiment of the present disclosure.

[0018] Figure 3 This is a schematic diagram of the rotating shaft structure in an embodiment of this disclosure.

[0019] Figure 4 This is a schematic diagram of the active block structure in an embodiment of this disclosure.

[0020] Figure 5 This is a schematic diagram of the gear structure in an embodiment of this disclosure.

[0021] Figure 6 In the embodiments of this disclosure Figure 5 Enlarged diagram of point A in the middle.

[0022] Figure 7 This is a schematic cross-sectional view of the gear in an embodiment of this disclosure.

[0023] Figure 8 This is a cross-sectional view of the support base in an embodiment of this disclosure.

[0024] Figure 9 This is a cross-sectional view of the control cylinder in an embodiment of this disclosure.

[0025] Figure 10 This is a cross-sectional view of the fixed cylinder in an embodiment of this disclosure.

[0026] Reference numerals: Limiting assembly 1, first fixing ring 11, fixing rod 12, first telescopic rod 13, fixing cylinder 131, movable rod 132, second piston head 133, movable block 14, second fixing ring 15, roller pressing assembly 2, rotating shaft 21, pin hole 211, slot 212, ratchet 213, ratchet tooth 214, elastic plate 215, support seat 22, movable arm 23, pressure roller 24, bidirectional lead screw 25, control assembly 3, gear 31, receiving cavity 311, spring 312, locking block 313, inclined surface 314, toothed plate 32, support plate 33, first fixing block 34, second fixing block 35, second telescopic rod 36, third fixing block 37, pin shaft 38, control cylinder 39, first connecting pipe 391, second connecting pipe 392, cylinder 393, first piston head 394. Detailed Implementation

[0027] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Example 1

[0028] Reference Figures 1-3 This embodiment provides a hot continuous rolling production device for oil casing, including a limiting component 1 and a rolling component 2. The limiting component 1 includes a first fixed ring 11, a fixed rod 12, a first telescopic rod 13, a movable block 14, and a second fixed ring 15. The first fixed ring 11 and the second fixed ring 15 are fixedly connected to both ends of the fixed rod 12. One end of the first telescopic rod 13 is fixedly connected to the inner wall of the first fixed ring 11 and the second fixed ring 15, and the other end of the first telescopic rod 13 is fixedly connected to the movable block 14. Three sets of the first telescopic rod 13 and the movable block 14 are arranged in a circular array inside the first fixed ring 11 and the second fixed ring 15.

[0029] In this preferred embodiment, three sets of first telescopic rods 13 and movable blocks 14 are respectively provided on the inner sides of the first fixed ring 11 and the second fixed ring 15. The centers of the three movable blocks 14 form a limiting hole, and the radial dimension of the limiting hole on the inner side of the first fixed ring 11 is larger than that on the inner side of the second fixed ring 15. In use, the unrolled oil casing is first passed through the limiting hole on the inner side of the first fixed ring 11, and then through the limiting hole on the inner side of the second fixed ring 15. The limiting hole is used to limit the oil casing. When the first telescopic rod 13 retracts, it can drive the movable blocks 14 to move, which can clean the limiting hole. When the first telescopic rod 13 extends, it can drive the movable blocks 14 to move. At this time, the three movable blocks 14 are together to limit the oil casing.

[0030] The roller pressing assembly 2 includes a rotating shaft 21, a support base 22, a movable arm 23, and a pressure roller 24. The two ends of the rotating shaft 21 are rotatably connected to movable blocks 14, and the rotating shaft 21 is fixedly connected to the support base 22. The inner walls of both ends of the support base 22 are slidably connected to one end of the movable arm 23, and the other end of the movable arm 23 is rotatably connected to the pressure roller 24. The support base 22, the movable arm 23, and the pressure roller 24 are arranged in three sets and are respectively arranged in a circular array on the rotating shaft 21.

[0031] In this preferred embodiment, when the rotating shaft 21 rotates, it can drive the support base 22, the movable arm 23, and the pressure roller 24 to rotate. The movable arm 23 is L-shaped and symmetrically arranged at both ends of the support base 22. The contact position between the movable arm 23 and the support base 22 is square. One end of the pressure roller 24 is connected to a servo motor to drive the pressure roller 24 to rotate and precisely control the speed of the pressure roller 24. The rotating shaft 21 can replace the pressure roller 24 in contact with the oil sleeve by rotating 120° without stopping the machine to remove the old pressure roller 24 and then install the new pressure roller 24. This helps to save time in replacing the pressure roller 24 and avoids affecting production efficiency. Moreover, the roller pressing assembly 2 has a compact structure and can realize lateral roller changing. Example 2

[0032] This embodiment is based on the previous embodiment, but differs from the previous embodiment in that...

[0033] Reference Figure 3 It also includes a control component 3, which includes a gear 31, a toothed plate 32, a support plate 33, a first fixing block 34, a second fixing block 35, and a second telescopic rod 36. The gear 31 is fixedly connected to the rotating shaft 21 and meshes with the toothed plate 32. The toothed plate 32 is fixedly connected to the support plate 33. The support plate 33 is fixedly connected to the first fixing block 34. The first fixing block 34 is fixedly connected to one end of the second telescopic rod 36, and the other end of the second telescopic rod 36 is fixedly connected to the second fixing block 35. The second fixing block 35 is fixedly connected to the movable block 14.

[0034] In this preferred embodiment, the second fixing block 35 is used to fix the position of the second telescopic rod 36. When the second telescopic rod 36 moves in a telescopic motion, it can drive the first fixing block 34 to move. The movement of the first fixing block 34 drives the support plate 33 to move. The support plate 33 drives the toothed plate 32 to move. The toothed plate 32 drives the gear 31 to rotate. The gear 31 drives the rotating shaft 21 to rotate.

[0035] Reference Figure 5 The support plate 33 is fixedly connected to the third fixing block 37, and the third fixing block 37 is fixedly connected to the pin 38. The rotating shaft 21 has a pin hole 211 corresponding to the pin 38. There are three pin holes 211, which are arranged in a circular array on the rotating shaft 21.

[0036] In this preferred embodiment, the angle between the three pin holes 211 is 120°, and when the toothed plate 32 moves, it drives the pin shaft 38 to move via the third fixing block 37; the toothed plate 32 moves... Figure 5 The gear moves to the left, and the pin 38 is pulled out of the pin hole 211 through the third fixing block 37. Then the gear 31 and the toothed plate 32 mesh. The toothed plate 32 moves, causing the gear 31 to rotate 120° in the forward direction. The gear 31 drives the rotating shaft 21 to rotate 120°, replacing the pressure roller 24 that is in contact with the oil sleeve. Then the toothed plate 32 moves to the left. Figure 5 When the gear moves to the right, the toothed plate 32 drives the gear 31 to rotate in the opposite direction. At this time, the gear 31 does not drive the rotating shaft 21 to rotate until the pin 38 is inserted into the pin hole 211, thus locking the position of the rotating shaft 21. At this time, the rotating shaft 21 cannot rotate.

[0037] Reference Figure 7 The gear 31 has a receiving cavity 311. One end of the spring 312 is fixedly connected to the inner end wall of the receiving cavity 311. The other end of the spring 312 is fixedly connected to the locking block 313. The locking block 313 is slidably connected to the inner wall of the receiving cavity 311. The locking block 313 is provided with an inclined surface 314. The rotating shaft 21 is provided with a locking groove 212 corresponding to the locking block 313.

[0038] In this preferred embodiment, under the elastic force of the spring 312, a portion of the locking block 313 is inserted into the locking slot 212. When the gear 31 rotates in the forward direction, the side of the locking block 313 away from the inclined surface 314 pushes the rotating shaft 21 to rotate, and the rotation of the gear 31 can drive the rotating shaft 21 to rotate. When the gear 31 rotates in the reverse direction, the rotating shaft 21 presses against the inclined surface 314, pressing the locking block 313 into the receiving cavity 311, and the rotation of the gear 31 cannot drive the rotating shaft 21 to rotate.

[0039] Reference Figure 8 The movable arm 23 is threadedly connected to a bidirectional lead screw 25, and a square groove 251 is provided at one end of the bidirectional lead screw 25.

[0040] In this preferred embodiment, a corresponding square steel rod is inserted into the square groove 251. Rotating the square steel rod can drive the bidirectional lead screw 25 to rotate. The bidirectional lead screw 25 drives the two movable arms 23 to move closer or further apart. When the two movable arms 23 move further apart, the old pressure roller 24 can be removed. After replacing it with a new pressure roller 24, the two movable arms 23 are controlled to move closer together to lock the position of the new pressure roller 24. Moreover, the two ends of the pressure roller 24 are rotatably connected to the movable arms 23.

[0041] Reference Figure 9 The control component 3 also includes a control cylinder 39, which is connected to the first telescopic rod 13 via a first connecting pipe 391 and to the second telescopic rod 36 via a second connecting pipe 392.

[0042] In this preferred embodiment, when the air pressure inside the control cylinder 39 increases, the air pressure acts on the first telescopic rod 13 through the first connecting pipe 391. The first telescopic rod 13 contracts as the air pressure increases, and this contraction drives the movable block 14 to move outwards. This allows for cleaning of the limiting hole. The movable block 14 drives the rotating shaft 21 to move, and the three rotating shafts 21 are kept apart to prevent collisions with the pressure roller 24 when the rotating shaft 21 rotates. The air pressure acts on the second telescopic rod 36 through the second connecting pipe 392, causing the second telescopic rod 36 to extend. The second telescopic rod 36 drives the toothed plate 32 to move along the support plate 33 via the first fixing block 34. Figure 5 Move to the left, toothed plate 32 towards Figure 5 Move to the left and pull the pin 38 out of the pin hole 211 through the third fixing block 37 to release the lock on the position of the rotating shaft 21. Then the gear 31 and the toothed plate 32 mesh. The toothed plate 32 moves and drives the gear 31 to rotate 120° in the forward direction. The gear 31 drives the rotating shaft 21 to rotate 120° and replaces the pressure roller 24 that is in contact with the oil sleeve.

[0043] When the air pressure inside the control cylinder 39 decreases, the air pressure acts on the first telescopic rod 13 through the first connecting pipe 391. The first telescopic rod 13 extends when the air pressure inside decreases, and this extension drives the movable block 14 to move inwards. At this time, the three movable blocks 14 are together, used to limit the oil casing. The movable blocks 14 drive the rotating shaft 21 to move, and the three rotating shafts 21 move closer to each other. The three pressure rollers 24 can perform hot continuous rolling on the oil casing between the pressure rollers 24. The air pressure acts on the second telescopic rod 36 through the second connecting pipe 392, causing the second telescopic rod 36 to retract. The second telescopic rod 36 drives the toothed plate 32 to move through the first fixed block 34, and the support plate 33 moves towards... Figure 5 Move to the right side, toothed plate 32 towards Figure 5 When the gear moves to the right, the toothed plate 32 drives the gear 31 to rotate in the opposite direction. At this time, the gear 31 does not drive the rotating shaft 21 to rotate until the pin 38 is inserted into the pin hole 211, thus locking the position of the rotating shaft 21. At this time, the rotating shaft 21 cannot rotate.

[0044] Reference Figure 9 The inner end wall of the control cylinder 39 is fixedly connected to one end of the cylinder 393, and the other end of the cylinder 393 is fixedly connected to the first piston head 394. The first piston head 394 is slidably connected to the inner wall of the control cylinder 39.

[0045] In this preferred embodiment, when the cylinder 393 performs the telescopic movement, it drives the first piston head 394 to slide on the inner wall of the control cylinder 39. At this time, the air pressure on the inner wall of the control cylinder 39 to the right of the first piston head 394 increases or decreases.

[0046] Reference Figure 10The first telescopic rod 13 includes a fixed cylinder 131, a movable rod 132, and a second piston head 133. The outer end of the fixed cylinder 131 is fixedly connected to the inner wall of the first fixed ring 11 or the second fixed ring 15. The inner wall of the fixed cylinder 131 is slidably connected to the second piston head 133. The second piston head 133 is fixedly connected to one end of the movable rod 132. The movable rod 132 passes through the fixed cylinder 131, and the other end of the movable rod 132 is fixedly connected to the movable block 14. The fixed cylinder 131 is connected to the first connecting pipe 391.

[0047] In this preferred embodiment, when the gas in the first connecting pipe 391 enters the fixed cylinder 131, the internal gas pressure of the fixed cylinder 131 increases, and the second piston head 133 moves towards... Figure 10 The second piston head 133 moves upward, causing the movable rod 132 to retract into the fixed cylinder 131, and the first telescopic rod 13 retracts; when the air pressure inside the fixed cylinder 131 decreases, the second piston head 133 moves upward. Figure 10 As the piston moves downward, the second piston head 133 drives the movable rod 132 to extend from the fixed cylinder 131, and the first telescopic rod 13 extends.

[0048] Reference Figure 7 A ratchet 213 is fixedly connected to the rotating shaft 21. The ratchet 213 is engaged with a ratchet tooth 214. The ratchet tooth 214 is fixedly connected to one end of an elastic plate 215. The other end of the elastic plate 215 is fixedly connected to a movable block 14.

[0049] In this embodiment, the elastic plate 215 is preferably made of steel sheet, which is used to press the ratchet 214 onto the ratchet 213 and engage with the ratchet 213.

[0050] When the air pressure inside the control cylinder 39 increases, the air pressure acts on the first telescopic rod 13 through the first connecting pipe 391. The first telescopic rod 13 contracts as the air pressure increases, and this contraction drives the movable block 14 to move outwards. This allows for cleaning of the limiting hole. The movable block 14 drives the rotating shaft 21 to move, and the three rotating shafts 21 move away from each other to prevent collisions with the pressure roller 24 when the rotating shaft 21 rotates. The air pressure acts on the second telescopic rod 36 through the second connecting pipe 392, causing the second telescopic rod 36 to extend. The second telescopic rod 36, through the first fixing block 34, drives the toothed plate 32 to move, and the support plate 33 moves towards... Figure 5 Move to the left, toothed plate 32 towards Figure 5 Move to the left and pull the pin 38 out of the pin hole 211 through the third fixing block 37 to release the lock on the position of the rotating shaft 21. Then the gear 31 and the toothed plate 32 mesh. The toothed plate 32 moves and drives the gear 31 to rotate 120° in the forward direction. The gear 31 drives the rotating shaft 21 to rotate 120° and replaces the pressure roller 24 that is in contact with the oil sleeve. At this time, the ratchet 213 rotates along the ratchet 214.

[0051] When the air pressure inside the control cylinder 39 decreases, the air pressure acts on the first telescopic rod 13 through the first connecting pipe 391. The first telescopic rod 13 extends when the air pressure inside decreases, and this extension drives the movable block 14 to move inwards. At this time, the three movable blocks 14 are together, used to limit the oil casing. The movable blocks 14 drive the rotating shaft 21 to move, and the three rotating shafts 21 move closer to each other. The three pressure rollers 24 can perform hot continuous rolling on the oil casing between the pressure rollers 24. The air pressure acts on the second telescopic rod 36 through the second connecting pipe 392, causing the second telescopic rod 36 to retract. The second telescopic rod 36 drives the toothed plate 32 to move through the first fixed block 34, and the support plate 33 moves towards... Figure 5 Move to the right side, toothed plate 32 towards Figure 5 When the gear moves to the right, the toothed plate 32 drives the gear 31 to rotate in the opposite direction, and the ratchet 213 rotates against the ratchet 214. At this time, the rotating shaft 21 cannot rotate. Gear 31 cannot drive the rotating shaft 21 to rotate until pin 38 is inserted into pin hole 211, thus locking the position of rotating shaft 21. At this time, rotating shaft 21 cannot rotate. Example 3

[0052] This embodiment is based on the previous embodiment, but differs from the previous embodiment in that it discloses a hot continuous rolling production process for oil casing.

[0053] Step 1: Pass the oil casing through the limiting hole between the movable blocks 14 to the roller pressing assembly 2, and control the pressure roller 24 to rotate to heat press the oil casing; Step 2: Control the rotating shaft 21 to rotate 120° and replace the pressure roller 24 that is in contact with the oil sleeve; Step 3: Control the movable arm 23 to move to the outer end of the support base 22, remove the old pressure roller 24, and replace it with a new pressure roller 24; Step 4: Control the movable arm 23 to move towards the center of the support base 22 to complete the replacement of the pressure roller 24.

[0054] The rotating shaft 21 can rotate 120° to replace the pressure roller 24 that is in contact with the oil sleeve without stopping the machine to remove the old pressure roller 24 and then install the new pressure roller 24. This helps to save time in replacing the pressure roller 24 and avoid affecting production efficiency. Moreover, the roller pressing assembly 2 has a compact structure and can realize side roller changing.

Claims

1. A hot continuous rolling production apparatus for oil casing, characterized in that: include The limiting component (1) includes a first fixed ring (11), a fixed rod (12), a first telescopic rod (13), a movable block (14), and a second fixed ring (15). The two ends of the fixed rod (12) are respectively fixedly connected to the first fixed ring (11) and the second fixed ring (15). The inner walls of the first fixed ring (11) and the second fixed ring (15) are respectively fixedly connected to one end of the first telescopic rod (13). The other end of the first telescopic rod (13) is fixedly connected to the movable block (14). The first telescopic rod (13) and the movable block (14) are provided in three sets and are respectively arranged in a circular array inside the first fixed ring (11) and the second fixed ring (15). The roller pressing assembly (2) includes a rotating shaft (21), a support base (22), a movable arm (23), and a pressure roller (24). The two ends of the rotating shaft (21) are rotatably connected to movable blocks (14), and the rotating shaft (21) is fixedly connected to the support base (22). The inner walls of the two ends of the support base (22) are slidably connected to one end of the movable arm (23), and the other end of the movable arm (23) is rotatably connected to the pressure roller (24). The support base (22), the movable arm (23), and the pressure roller (24) are arranged in three sets and are respectively arranged in a circular array on the rotating shaft (21). It also includes a control component (3), which includes a gear (31), a toothed plate (32), a support plate (33), a first fixed block (34), a second fixed block (35), and a second telescopic rod (36). The gear (31) is fixedly connected to the rotating shaft (21), the gear (31) meshes with the toothed plate (32), the toothed plate (32) is fixedly connected to the support plate (33), the support plate (33) is fixedly connected to the first fixed block (34), the first fixed block (34) is fixedly connected to one end of the second telescopic rod (36), the other end of the second telescopic rod (36) is fixedly connected to the second fixed block (35), and the second fixed block (35) is fixedly connected to the movable block (14).

2. The hot continuous rolling production apparatus for oil casing as described in claim 1, characterized in that: The support plate (33) is fixedly connected to the third fixing block (37), the third fixing block (37) is fixedly connected to the pin (38), and the rotating shaft (21) has a pin hole (211) corresponding to the pin (38). There are three pin holes (211), which are arranged in a circular array on the rotating shaft (21).

3. The hot continuous rolling production apparatus for oil casing as described in claim 2, characterized in that: The gear (31) has a receiving cavity (311). One end of a spring (312) is fixedly connected to the inner wall of the receiving cavity (311), and the other end of the spring (312) is fixedly connected to a locking block (313). The locking block (313) is slidably connected to the inner wall of the receiving cavity (311). An inclined surface (314) is provided on the locking block (313), and a slot (212) is provided on the rotating shaft (21) corresponding to the locking block (313).

4. The hot continuous rolling production apparatus for oil casing as described in claim 1, characterized in that: The movable arm (23) is threadedly connected to a two-way lead screw (25), and a square groove (251) is provided at one end of the two-way lead screw (25).

5. The hot continuous rolling production apparatus for oil casing as described in claim 1, characterized in that: The control component (3) also includes a control cylinder (39), which is connected to the first telescopic rod (13) via a first connecting pipe (391) and to the second telescopic rod (36) via a second connecting pipe (392).

6. The hot continuous rolling production apparatus for oil casing as described in claim 5, characterized in that: The inner wall of the control cylinder (39) is fixedly connected to one end of the cylinder (393), and the other end of the cylinder (393) is fixedly connected to the first piston head (394). The first piston head (394) is slidably connected to the inner wall of the control cylinder (39).

7. The hot continuous rolling production apparatus for oil casing as described in claim 6, characterized in that: The first telescopic rod (13) includes a fixed cylinder (131), a movable rod (132), and a second piston head (133). The outer end of the fixed cylinder (131) is fixedly connected to the inner wall of the first fixed ring (11) or the second fixed ring (15). The inner wall of the fixed cylinder (131) is slidably connected to the second piston head (133). The second piston head (133) is fixedly connected to one end of the movable rod (132). The movable rod (132) passes through the fixed cylinder (131), and the other end of the movable rod (132) is fixedly connected to the movable block (14). The fixed cylinder (131) is connected to the first connecting pipe (391).

8. The hot continuous rolling production apparatus for oil casing as described in claim 1, characterized in that: A ratchet (213) is fixedly connected to the rotating shaft (21), the ratchet (213) meshes with a ratchet tooth (214), the ratchet tooth (214) is fixedly connected to one end of an elastic plate (215), and the other end of the elastic plate (215) is fixedly connected to a movable block (14).

9. A hot continuous rolling production process for oil casing, comprising the hot continuous rolling production apparatus for oil casing as described in any one of claims 1-8, characterized in that, include: Step 1: Pass the oil casing through the limiting hole between the movable blocks (14) to the roller pressing assembly (2), and control the pressure roller (24) to rotate to heat press the oil casing; Step 2: Control the rotating shaft (21) to rotate 120° and replace the pressure roller (24) that is in contact with the oil sleeve. Step 3: Control the movable arm (23) to move to the outer end of the support base (22), remove the old pressure roller (24), and replace it with a new pressure roller (24). Step 4: Control the movable arm (23) to move towards the center of the support base (22) to complete the replacement of the pressure roller (24).

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