A device for automatically cutting thin-walled steel pipes to a certain size

Abstract

The present invention relates to the technical field of thin-walled steel pipe cutting, and discloses a fixed-size automatic cutting device for thin-walled steel pipes, comprising a body, the top of the body is fixedly connected to the bottom of a cutting table, the upper surface of the cutting table is slidably connected to the bottom of a bracket, the surface of the bracket is fixedly connected to the fixed end of a cylinder, the bottom of the cylinder is provided with a cutting piece, the bottom of the cutting piece is provided with an adjusting structure, the adjusting structure comprises a stepper motor 1, the top of the cutting table is provided with a stepper motor 1, the output end of the stepper motor 1 is fixedly connected to the end of a rotating shaft, the outer surface of the rotating shaft is fixedly connected to the inner surface of a driving gear, and a driven gear is provided on one side of the driving gear. By providing the adjusting mechanism, the thin-walled steel pipe can be provided with the functions of conveying, supporting, fixing, straight cutting or oblique cutting when performing fine cutting, thereby improving the fineness and stability during cutting.

Description

Technical Field

[0001] The invention relates to the technical field of thin-walled steel pipe cutting, in particular to a device for automatically cutting thin-walled steel pipes to predetermined sizes. Background Art

[0002] Thin-walled steel pipe is a steel pipe with relatively thin wall thickness and small diameter, usually with a wall thickness of less than 3 mm and a diameter of less than 114 mm. Compared with ordinary steel pipes, thin-walled steel pipes have lighter weight, higher strength and higher corrosion resistance. It is an efficient, economical, green and environmentally friendly steel structure material. Thin-walled steel pipes are widely used in the construction field, especially for structures that bear light loads, such as interior partitions, ceilings, door frames, window frames, etc. In the production process of thin-walled steel pipes, thin-walled steel pipes need to be cut so that the thin-walled steel pipes can be cut into a certain size according to usage requirements.

[0003] When cutting thin-walled steel pipes, the existing cutting device is equipped with an adjustment bar, a push rod, a transmission rod and a stepper motor. The stepper motor is used to drive the adjustment bar to move on the workbench, driving the push rod to move synchronously, so that the push rods on both sides of the processing groove can clamp and limit the thin-walled steel pipe, ensuring the movement trajectory of the thin-walled steel pipe during cutting.

[0004] However, in actual use, when cutting thin-walled steel pipes, if the cutting surface of the thin-walled steel pipe needs to be adjusted, it is difficult to make precise adjustments according to the cutting requirements, which reduces the accuracy and convenience of the cutting angle when cutting the thin-walled steel pipe. In view of this, we propose a fixed-size automatic cutting device for thin-walled steel pipes. Summary of the Invention

[0005] The object of the present invention is to provide a device for automatically cutting thin-walled steel pipes to a predetermined size, so as to solve the problems mentioned in the above background technology.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solution: an automatic sizing device for thin-walled steel pipes, comprising a body, the top of which is fixedly connected to the bottom of a cutting table, the cutting table being convenient for placing thin-walled steel pipes, the upper surface of the cutting table being slidably connected to the bottom of a bracket, the surface of the bracket being fixedly connected to the fixed end of a cylinder, the bottom of the cylinder being provided with a cutting piece, the bottom of the cutting piece being provided with an adjustment structure, the adjustment structure comprising:

[0007] Stepper motor 1: The top of the cutting table is provided with stepper motor 1, which can accurately control the amplitude of the rotating shaft. The output end of the stepper motor 1 is fixedly connected to the end of the rotating shaft, the outer surface of the rotating shaft is fixedly connected to the inner surface of the driving gear, a driven gear is provided on one side of the driving gear, the inner surface of the driven gear is fixedly connected to the outer surface of the turntable, the outer surface of the turntable is fixedly connected to the end of the indicator, and the bottom of the indicator is provided with a scale mark;

[0008] A support column, the top of the turntable is fixedly connected to the bottom of the support column, the top of the support column is fixedly connected to the bottom of the arc frame, a moving block is provided on the outside of the arc frame, the top of the moving block is fixedly connected to the bottom of the limit plate, the side wall of the limit plate is fixedly connected to the end of the fixed plate, and the side wall of the fixed plate is fixedly connected to the end of the stepper motor 2;

[0009] Conveying roller, the output end of the stepper motor 2 is fixedly connected to the end of the conveying roller, the outer wall of the conveying roller is transmission-connected to the conveyor belt, the outer surface of the conveyor belt is fixedly connected to the side wall of the anti-slip strip, the bottom of the anti-slip strip is provided with a support frame, the upper surface of the cutting table is slidably connected to the bottom of the mounting block, the bottom of the moving block is slidably connected to the inside of the arc groove, the side wall of the bracket is fixedly connected to the output end of the hydraulic cylinder, the fixed end of the hydraulic cylinder is fixedly connected to the side wall of the fixed frame, the upper surface of the arc frame is fixedly connected to the lower surface of the positioning frame, the upper surface of the positioning frame is fixedly connected to the end of the electric push rod, and the output end of the electric push rod is fixedly connected to the top of the positioning plate.

[0010] Preferably, one end of the rotating shaft away from the stepping motor is rotatably connected to the upper surface of the mounting block, the driving gear engages with the driven gear, and the turntable is rotatably connected to the top of the mounting block.

[0011] Preferably, a scale mark is provided on the upper surface of the mounting block, and the bottom of the movable block is rotatably connected to the surface of the cutting table.

[0012] Preferably, the top of the support frame is in contact with the bottom of the fixing plate, and the other end of the support frame is located at the bottom of the cutting table.

[0013] Preferably, a limiting structure is provided on the outside of the support frame, and the limiting structure includes a matching groove, the inside of the matching groove is slidingly connected to the top of the follower block, the side wall of the follower block is fixedly connected to the side wall of the connecting frame, the inner surface of the connecting frame is slidingly connected to the outer surface of the sliding rod, the end of the sliding rod is fixedly connected to the side wall of the push plate, the other end of the sliding rod is fixedly connected to the limiting tooth, and the outside of the limiting tooth is provided with a fixed tooth, the upper surface of the cutting table is provided with a movable groove, the inner surface of the movable groove is rotatably connected to one end of the reciprocating screw rod, and the other end of the reciprocating screw rod is fixedly connected to the output end of the driving motor.

[0014] Preferably, the bottom of the follower block is fixedly connected to the end of the support frame, and the shape of the matching groove is consistent with the shape of the arc groove.

[0015] Preferably, the top of the fixed teeth is fixedly connected to the bottom of the cutting table.

[0016] Preferably, the inner surface of the lower end of the mounting block is threadedly connected to the outer wall of the reciprocating screw.

[0017] Preferably, a limiting auxiliary structure is provided on the outside of the push plate, and the limiting auxiliary structure includes a magnet ring 1, the side wall of the magnet ring 1 is magnetically connected to the side wall of the magnet ring 2, and the outside of the magnet ring 2 is provided with anti-slip bumps.

[0018] Preferably, the inner surface of the magnet ring one is fixedly connected to the outer surface of the slide rod, the side of the magnet ring two away from the magnet ring one is fixedly connected to the side of the connecting frame close to the push plate, and the end of the anti-slip protrusion is fixedly connected to the surface of the limiting tooth.

[0019] Compared with the prior art, the present invention provides a device for automatically cutting thin-walled steel pipes to a predetermined size, which has the following beneficial effects:

[0020] 1. The automatic sizing cutting device for thin-walled steel pipes is provided with an adjustment mechanism, an arc frame and a limit plate to support the thin-walled steel pipe, two sets of electric push rods control the positioning plate to approach the surface of the thin-walled steel pipe to fit and press it to avoid deviation, the stepper motor drives the rotating shaft to make the driving gear drive the turntable to rotate through the driven gear, and the indicator mark and the scale mark can clearly show the amplitude of the turntable steering adjustment, and the stepper motor rotates the conveyor belt to transport the thin-walled steel pipe through the rotation of the conveyor roller, so that the thin-walled steel pipe can be adjusted to perform oblique cutting when being cut, so that the thin-walled steel pipe can be provided with the functions of conveying, supporting, fixing, straight cutting or oblique cutting when being finely cut, thereby improving the precision and stability of the thin-walled steel pipe when being cut.

[0021] 2. The automatic sizing cutting device for thin-walled steel pipes is provided with a limiting structure. When the direction of the thin-walled steel pipe is adjusted, the support frame drives the follower block to slide inside the matching groove. The push plate is used to drive the slide rod to slide inside the connecting frame until the limiting teeth are embedded in the gaps of the fixed teeth. The driving motor drives the reciprocating screw to rotate so that the mounting block drives the arc frame to translate on the surface of the cutting table. This is convenient for providing support force for thin-walled steel pipes of different lengths and limiting the support frame when the direction of the thin-walled steel pipe is adjusted, so as to avoid angle offset after the direction adjustment, which leads to reduced cutting accuracy.

[0022] 3. The automatic sizing device for thin-walled steel pipes is provided with a limiting auxiliary structure. The cooperation between the first and second magnet rings positions the push plate on the connecting frame, preventing the limiting teeth from disengaging from the fixed teeth so that the connecting frame will not be displaced. At the same time, the anti-slip protrusions increase the friction between the fixed teeth and the limiting teeth, thereby improving the stability of the limit after the direction is adjusted. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a top view schematic diagram of the main structure of the present invention;

[0024] Figure 2 This is an enlarged schematic diagram of the structure of area A of the present invention;

[0025] Figure 3 It is a right side schematic diagram of the main structure of the present invention;

[0026] Figure 4 It is a bottom view schematic diagram of the main structure of the present invention;

[0027] Figure 5 This is an enlarged schematic diagram of the structure of region B of the present invention;

[0028] Figure 6 It is a left side schematic diagram of the main structure of the present invention;

[0029] Figure 7 This is an enlarged schematic diagram of the structure of region C of the present invention.

[0030] In the figure: 1, machine body; 2, cutting table; 3, bracket; 4, cylinder; 5, cutting piece; 6, adjustment structure; 601, stepper motor 1; 602, rotating shaft; 603, driving gear; 604, driven gear; 606, indicator; 607, scale mark; 608, support column; 609, arc frame; 610, moving block; 611, limit plate; 612, fixed plate; 613, stepper motor 2; 614, conveyor roller; 615, conveyor belt; 616, anti-slip strip; 617, support frame; 618, installation Mounting block; 619, arc groove; 620, fixed frame; 621, hydraulic cylinder; 622, electric push rod; 623, positioning plate; 624, positioning frame; 7, limiting structure; 701, matching groove; 702, follower block; 703, push plate; 704, slide bar; 705, limiting tooth; 706, fixed tooth; 707, connecting frame; 708, movable groove; 709, reciprocating screw; 710, driving motor; 8, limiting auxiliary structure; 801, magnet ring one; 802, magnet ring two; 803, anti-slip bump. DETAILED DESCRIPTION

[0031] like Figure 1-Figure 7As shown, the present invention provides a technical solution: a fixed-size automatic cutting device for thin-walled steel pipes, comprising a body 1, the top of the body 1 is fixedly connected to the bottom of a cutting table 2, the upper surface of the cutting table 2 is slidably connected to the bottom of a bracket 3, the surface of the bracket 3 is fixedly connected to the fixed end of a cylinder 4, the bottom of the cylinder 4 is provided with a cutting piece 5, the bottom of the cutting piece 5 is provided with an adjustment structure 6, the adjustment structure 6 includes a stepper motor 601, the top of the cutting table 2 is provided with a stepper motor 601, the output end of the stepper motor 601 is provided The end of the rotating shaft 602 is fixedly connected, the outer surface of the rotating shaft 602 is fixedly connected to the inner surface of the driving gear 603, a driven gear 604 is provided on one side of the driving gear 603, the inner surface of the driven gear 604 is fixedly connected to the outer surface of the turntable, the outer surface of the turntable is fixedly connected to the end of the indicator 606, the bottom of the indicator 606 is provided with a scale mark 607, the top of the turntable is fixedly connected to the bottom of the support column 608, the top of the support column 608 is fixedly connected to the bottom of the arc frame 609, and the arc frame 609 is fixedly connected to the bottom of the arc frame 609. A moving block 610 is provided on the outside, the top of the moving block 610 is fixedly connected to the bottom of the limit plate 611, the side wall of the limit plate 611 is fixedly connected to the end of the fixed plate 612, the side wall of the fixed plate 612 is fixedly connected to the end of the stepper motor 2 613, the output end of the stepper motor 2 613 is fixedly connected to the end of the conveying roller 614, the outer wall of the conveying roller 614 is transmission-connected to the conveyor belt 615, the outer surface of the conveyor belt 615 is fixedly connected to the side wall of the anti-slip strip 616, and the bottom of the anti-slip strip 616 is provided with a support frame 6 17. The upper surface of the cutting table 2 is slidably connected to the bottom of the mounting block 618, the bottom of the moving block 610 is slidably connected to the inside of the arc groove 619, the side wall of the bracket 3 is fixedly connected to the output end of the hydraulic cylinder 621, the fixed end of the hydraulic cylinder 621 is fixedly connected to the side wall of the fixed frame 620, the upper surface of the arc frame 609 is fixedly connected to the lower surface of the positioning frame 624, the upper surface of the positioning frame 624 is fixedly connected to the end of the electric push rod 622, and the output end of the electric push rod 622 is fixedly connected to the top of the positioning plate 623.

[0032] In one embodiment of the present invention, one end of the rotating shaft 602 away from the stepping motor 601 is rotatably connected to the upper surface of the mounting block 618, the driving gear 603 engages the driven gear 604, the turntable is rotatably connected to the top of the mounting block 618, the upper surface of the mounting block 618 is provided with a scale mark 607, the bottom of the moving block 610 is rotatably connected to the surface of the cutting table 2, the top of the support frame 617 is affixed to the bottom of the fixed plate 612, the other end of the support frame 617 is located at the bottom of the cutting table 2, the surface of the limiting plate 611 is penetrated by a through hole, which is convenient for the thin-walled steel pipe to pass through, two groups of fixed plates 612 are provided, and the two groups of fixed plates 612 are mirror-imaged with the central axis of the limiting plate 611 as the symmetric axis, two groups of conveying rollers 614 are provided, and the two ends of the two groups of conveying rollers 614 are rotatably connected to the opposite side of the two groups of fixed plates 612, and several groups of anti-slip strips 616 are provided. The sliding strips 616 are distributed at equal distances on the surface of the conveyor belt 615. The anti-slip strips 616 facilitate increasing the friction between the conveyor belt 615 and the thin-walled steel pipe. Two groups of support frames 617 are provided, and the two groups of support frames 617 are respectively fixedly connected to the bottom of the two groups of fixed plates 612. The cutting piece 5 is composed of a mounting frame, a cutting motor, a rotating rod and a cutting knife. The cutting motor will drive the cutting knife to rotate at high speed. The top of the mounting frame is fixedly connected to the output end of the cylinder 4. The hydraulic cylinder 621 can push the bracket 3 to move back and forth on the surface of the cutting table 2. The driven gear 604 is engaged with the driving gear 603. The speed of the stepper motor 2 613 is slower than that of the stepper motor 1 601. The electric push rod 622 and the positioning plate 623 are provided with two groups, one group is set on the surface of the positioning frame 624, and the other group of electric push rods 622 is fixedly mounted on the upper surface of the limit plate 611 and fixedly connected to the other group of positioning plates 623.

[0033] In addition, in order to facilitate the limiting after the thin-walled steel pipe needs to be adjusted in angle for cutting, a limiting structure 7 is set on the outside of the support frame 617. The limiting structure 7 includes a matching groove 701. The inside of the matching groove 701 is slidably connected to the top of the follower block 702. The side wall of the follower block 702 is fixedly connected to the side wall of the connecting frame 707. The inner surface of the connecting frame 707 is slidably connected to the outer surface of the slide rod 704. The end of the slide rod 704 is fixedly connected to the side wall of the push plate 703. The other end of the slide rod 704 is fixedly connected to the limiting tooth 705. The outside of the limiting tooth 705 is provided with a fixed tooth 706. A movable groove 708 is opened on the upper surface of the cutting table 2. The inner surface of the movable groove 708 is rotatably connected to one end of the reciprocating screw rod 709. The other end of the reciprocating screw rod 709 is fixedly connected to the output end of the drive motor 710.

[0034] In an embodiment of the present invention, the bottom of the follower block 702 is fixedly connected to the end of the support frame 617, the shape of the matching groove 701 is consistent with the shape of the arc groove 619, the top of the fixed tooth 706 is fixedly connected to the bottom of the cutting table 2, the inner surface of the lower end of the mounting block 618 is threadedly connected to the outer wall of the reciprocating screw 709, the shape of the fixed tooth 706 is a half gear, and the teeth and the limiting teeth 705 form an embedded meshing state, the matching groove 701 is opened at the bottom of the cutting table 2, the number of follower blocks 702 set is equal to the support frame 617, and the two ends of the connecting frame 707 are fixedly connected to the side walls of the two groups of follower blocks 702.

[0035] In addition, in order to improve the stability of the limiting structure 7, a limiting auxiliary structure 8 is set on the outside of the push plate 703. The limiting auxiliary structure 8 includes a magnet ring 1 801. The side wall of the magnet ring 1 801 is magnetically connected to the side wall of the magnet ring 2 802. The outside of the magnet ring 2 802 is provided with anti-slip protrusions 803.

[0036] In an embodiment of the present invention, the inner surface of magnet ring 1 801 is fixedly connected to the outer surface of the slide rod 704, the side of magnet ring 2 802 away from magnet ring 1 801 is fixedly connected to the side of the connecting frame 707 close to the push plate 703, the end of the anti-slip protrusion 803 is fixedly connected to the surface of the limiting tooth 705, and the anti-slip protrusion 803 is provided in several groups, and the several groups of anti-slip protrusions 803 are equidistantly distributed on the surface of the limiting tooth 705, and a through hole for the slide rod 704 to move is opened at the center of magnet ring 2 802.

[0037] In the present invention, when in use, when the thin-walled steel pipe needs to be finely cut, the thin-walled steel pipe is first placed on the surface of the conveyor belt 615, so that the thin-walled steel pipe passes through the through hole of the limit plate 611 and is placed on the surface of the arc frame 609. The limit plate 611 and the arc frame 609 support the thin-walled steel pipe. At this time, if the thin-walled steel pipe needs to be obliquely cut, the operator starts the stepper motor 601, and the stepper motor 601 drives the rotating shaft 602 to rotate slowly. When the rotating shaft 602 rotates, it drives the driving gear 603 to rotate at the same time. Since the driven gear 604 is engaged with the driving gear 603, the driven gear 604 will drive the turntable to rotate. When the turntable rotates, it drives the indicator mark 606 to move above the scale mark 607 to judge whether the turntable needs to be turned. The degree of rotation of the turntable. When the turntable rotates, the support column 608 will drive the arc frame 609 to rotate to a certain extent. Since the thin-walled steel pipe is on the surface of the arc frame 609, and the thin-walled steel pipe is limited by the limit plate 611, the two sets of electric push rods 622 are started at the same time, so that the two sets of positioning plates 623 are driven to move the casting close to the upper surface of the thin-walled steel pipe to fit and press it. When the arc frame 609 rotates, the limit plate 611 will be driven to rotate through the thin-walled steel pipe. When the limit plate 611 is subjected to the force of rotation, the moving block 610 will follow the limit plate 611 to rotate and slide inside the arc groove 619, so that the limit plate 611 can adjust the angle smoothly. At the same time, the hydraulic cylinder 621 will simultaneously drive the bracket 3 to move so that the cutting knife remains When the limit plate 611 is adjusted in direction at the center of the thin-walled steel pipe, the two sets of fixed plates 612 will move, and the support frame 617 will drive the following block 702 to slide inside the matching groove 701. When the adjustment is completed, the hand pushes the pushing plate 703 inward, so that the sliding rod 704 continues to slide in the connecting frame 707 until the sliding rod 704 drives the limiting teeth 705 to be embedded in the fixed teeth 706 in groups of two. The fixed teeth 706 limit the limiting teeth 705, and when the fixed teeth 706 are inserted into the limiting teeth 705, the anti-slip protrusions 803 contact the surface of the fixed teeth 706, increasing the friction between the fixed teeth 706 and the limiting teeth 705, thereby allowing the fixed teeth 706 to stably provide positioning for the limiting teeth 705, thereby making The follower block 702 cannot move inside the matching groove 701. At this time, the magnet ring 1 801 will be magnetically attracted to the magnet ring 2 802, thereby fixing the push plate 703 on the connecting frame 707 to prevent the limiting tooth 705 from detaching from the fixed tooth 706. When the direction of the thin-walled steel pipe is adjusted, the cylinder 4 is turned on to drive the cutting piece 5 to descend and cut the thin-walled steel pipe. After the thin-walled steel pipe is cut, the stepper motor 2 613 is turned on to drive a group of conveying rollers 614 to rotate, so that the conveyor belt 615 conveys and cuts the subsequent thin-walled steel pipe. The conveyor belt 615 transports the thin-walled steel pipe at a slow and uniform speed, which is convenient for adjusting the cutting angle of the thin-walled steel pipe according to different cutting requirements. When the length of the thin-walled steel pipe changes, the drive motor 710 is started.The drive motor 710 drives the reciprocating screw 709 to rotate, allowing the reciprocating screw 709 to drive the mounting block 618 to move left and right on the cutting table 2. When the thin-walled steel pipe is long, the drive motor 710 stops when the mounting block 618 moves to the left side of the cutting table 2. When the thin-walled steel pipe is short, the drive motor 710 stops when the mounting block 618 moves to the right side of the cutting table 2. This allows the curved frame 609 to adjust and support thin-walled steel pipes of different lengths.

[0038] The above generally describes the present invention in detail. However, it is obvious to those skilled in the art that modifications or improvements may be made based on the present invention. Therefore, modifications or improvements that do not depart from the spirit of the present invention are within the scope of protection of the present invention.

Claims

1. A device for automatically cutting thin-walled steel pipes to a predetermined size, comprising a body (1), the top of the body (1) being fixedly connected to the bottom of a cutting table (2), the upper surface of the cutting table (2) being slidably connected to the bottom of a bracket (3), the surface of the bracket (3) being fixedly connected to the fixed end of a cylinder (4), the bottom of the cylinder (4) being provided with a cutting member (5), characterized in that: The bottom of the cutting member (5) is provided with an adjustment structure (6), and the adjustment structure (6) includes: A stepper motor (601) is provided on the top of the cutting table (2); the output end of the stepper motor (601) is fixedly connected to the end of a rotating shaft (602); the outer surface of the rotating shaft (602) is fixedly connected to the inner surface of a driving gear (603); a driven gear (604) is provided on one side of the driving gear (603); the inner surface of the driven gear (604) is fixedly connected to the outer surface of a rotating disk; the outer surface of the rotating disk is fixedly connected to the end of an indicator (606); and a scale mark (607) is provided at the bottom of the indicator (606); A support column (608), the top of the turntable is fixedly connected to the bottom of the support column (608), the top of the support column (608) is fixedly connected to the bottom of the arc frame (609), a moving block (610) is provided on the outside of the arc frame (609), the top of the moving block (610) is fixedly connected to the bottom of the limiting plate (611), the side wall of the limiting plate (611) is fixedly connected to the end of the fixed plate (612), and the side wall of the fixed plate (612) is fixedly connected to the end of the second stepping motor (613); The conveying roller (614) is fixedly connected to the output end of the stepping motor 2 (613) with the end of the conveying roller (614). The outer wall of the conveying roller (614) is connected to the conveying belt (615). The outer surface of the conveying belt (615) is fixedly connected to the side wall of the anti-slip strip (616). The bottom of the anti-slip strip (616) is provided with a support frame (617). The upper surface of the cutting table (2) is slidably connected to the bottom of the mounting block (618). The bottom of the moving block (610) slides. Connected to the inside of the arc-shaped groove (619), the side wall of the bracket (3) is fixedly connected to the output end of the hydraulic cylinder (621), the fixed end of the hydraulic cylinder (621) is fixedly connected to the side wall of the fixed frame (620), the upper surface of the arc-shaped frame (609) is fixedly connected to the lower surface of the positioning frame (624), the upper surface of the positioning frame (624) is fixedly connected to the end of the electric push rod (622), and the output end of the electric push rod (622) is fixedly connected to the top of the positioning plate (623); The end of the rotating shaft (602) away from the stepping motor (601) is rotatably connected to the upper surface of the mounting block (618), the driving gear (603) engages with the driven gear (604), the turntable is rotatably connected to the top of the mounting block (618), the upper surface of the mounting block (618) is provided with a scale mark (607), and the bottom of the moving block (610) is rotatably connected to the surface of the cutting table (2).

2. The automatic sizing device for thin-walled steel pipes according to claim 1, characterized in that: The top of the support frame (617) is in contact with the bottom of the fixing plate (612), and the other end of the support frame (617) is located at the bottom of the cutting table (2).

3. The automatic sizing device for thin-walled steel pipes according to claim 1, characterized in that: A limiting structure (7) is provided on the outside of the support frame (617), and the limiting structure (7) includes a matching groove (701), the inside of the matching groove (701) is slidably connected to the top of the follower block (702), the side wall of the follower block (702) is fixedly connected to the side wall of the connecting frame (707), the inner surface of the connecting frame (707) is slidably connected to the outer surface of the sliding rod (704), the end of the sliding rod (704) is fixedly connected to the side wall of the push plate (703), the other end of the sliding rod (704) is fixedly connected to the limiting tooth (705), and the outside of the limiting tooth (705) is provided with a fixed tooth (706), the upper surface of the cutting table (2) is provided with a moving groove (708), the inner surface of the moving groove (708) is rotatably connected to one end of a reciprocating screw rod (709), and the other end of the reciprocating screw rod (709) is fixedly connected to the output end of the driving motor (710).

4. The automatic sizing cutting device for thin-walled steel pipes according to claim 3, characterized in that: The bottom of the follower block (702) is fixedly connected to the end of the support frame (617), and the shape of the matching groove (701) is consistent with the shape of the arc groove (619).

5. The automatic sizing cutting device for thin-walled steel pipes according to claim 3, characterized in that: The top of the fixed tooth (706) is fixedly connected to the bottom of the cutting table (2).

6. The automatic sizing cutting device for thin-walled steel pipes according to claim 3, characterized in that: The inner surface of the lower end of the mounting block (618) is threadedly connected to the outer wall of the reciprocating screw rod (709).

7. The automatic sizing cutting device for thin-walled steel pipes according to claim 3, characterized in that: A limiting auxiliary structure (8) is provided on the outside of the push plate (703), and the limiting auxiliary structure (8) includes a magnet ring (801), the side wall of the magnet ring (801) is magnetically connected to the side wall of the magnet ring (802), and the outside of the magnet ring (802) is provided with an anti-slip protrusion (803).

8. The automatic sizing cutting device for thin-walled steel pipes according to claim 7, characterized in that: The inner surface of the magnet ring 1 (801) is fixedly connected to the outer surface of the slide rod (704), the side of the magnet ring 2 (802) away from the magnet ring 1 (801) is fixedly connected to the side of the connecting frame (707) close to the push plate (703), and the end of the anti-slip protrusion (803) is fixedly connected to the surface of the limiting tooth (705).

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