Anti-distortion C-shaped building steel cutting device

Abstract

The invention relates to the technical field of building steel cutting equipment, in particular to an anti-distortion C-shaped building steel cutting device which comprises a supporting frame and a circular sawing machine, and a positioning mechanism used for positioning to-be-cut C-shaped building steel is arranged at the top of the supporting frame; the positioning mechanism comprises a bottom bearing frame fixed to the top of the supporting frame, two top pressing frames and two inner fixing frames, the bottom of the inner wall of the bottom bearing frame is obliquely arranged, the inner fixing frames abut against the interior of the C-shaped building steel, and the bottom bearing frame and the top pressing frames abut against the exterior of the C-shaped building steel; the C-shaped building steel cutting device can resist external stress or internal stress when C-shaped building steel is cut, and it is guaranteed that the C-shaped building steel cannot be twisted inwards or outwards in the process that the C-shaped building steel is cut by the circular sawing machine.

Description

Technical Field

[0001] This invention relates to the field of metal cutting technology, and more particularly to the field of building steel cutting equipment technology, specifically a C-shaped building steel cutting device that prevents twisting. Background Technology

[0002] Due to its excellent mechanical properties and convenient installation characteristics, C-shaped structural steel is widely used in the fields of architectural decoration and construction, such as as interior ceiling joists, partition wall frames, curtain wall support components, and roof purlins. In these applications, long C-shaped steel often needs to be precisely cut on-site or in the factory according to the division dimensions of the decorative surface or the actual module of the building structure.

[0003] In existing technologies, the cutting of C-shaped steel is mostly carried out using equipment with a low degree of automation. The common practice is to place the C-shaped steel on a workbench and cut it using a circular saw that moves up and down. Although this cutting method avoids the instability of hand operation, this conventional placement method leaves the open side web of the C-shaped steel in a cantilevered or weakly supported state.

[0004] During the cutting process, the high-speed rotation and downward pressure of the saw blade generate significant vibration and lateral force. For thin-walled C-shaped steel with an opening, the opening edge is highly susceptible to plastic deformation, such as inward concavity or outward curling (e.g., Figure 12 and Figure 13 In the field of architectural decoration, this cutting deformation directly affects the flatness of the keel splicing and the finished effect of the surface; in building construction, it will affect the connection strength and installation accuracy of the secondary structural components, often requiring secondary correction, which increases the complexity and time cost of construction. Summary of the Invention

[0005] The purpose of this invention is to provide a C-shaped steel cutting device for preventing twisting, so as to solve the problems mentioned in the background art.

[0006] The objective of this invention can be achieved through the following technical solutions: A twist-resistant C-shaped building steel cutting device includes a support frame and a circular saw, characterized in that the top of the support frame is provided with a positioning mechanism for positioning the C-shaped building steel to be cut. The positioning mechanism includes a bottom support frame fixed to the top of the support frame, two top clamping frames, and two internal fixing frames, with the bottom of the inner wall of the bottom support frame inclined. The cutting device also includes: An external positioning control mechanism is installed on one side of the support mechanism to control the positioning mechanism to press the C-shaped building steel from the outside; An internal positioning control mechanism installed inside the support frame to control the positioning mechanism to internally tighten the C-shaped structural steel; A reversing mechanism mounted on a support frame, used to convert the motion of an external positioning control mechanism into the motion of an internal positioning control mechanism.

[0007] Preferably, a support mechanism is provided on one side of the support frame. The support mechanism includes a vertical support frame, on which a first electric telescopic rod is installed. The telescopic end of the first electric telescopic rod is fixedly connected to the circular saw and is used to drive the circular saw to move up and down.

[0008] Preferably, the external positioning control mechanism includes a second electric telescopic rod, the telescopic end of which is connected to a sliding block, and the sliding block is connected to two top pressing frames through a double-end connecting plate and a pressing sleeve.

[0009] Preferably, the support frame is provided with an internal positioning control mechanism, which includes a first sliding plate and a second sliding plate. The tops of the first sliding plate and the second sliding plate are respectively fixedly connected to two internal fixed frames through connecting plates.

[0010] Preferably, the reversing mechanism includes an outer frame fixed to one side of the support frame, a tension spring fixed inside the outer frame, a guide plate fixedly connected to one end of the tension spring, and a sloped top of the guide plate; a longitudinal push plate is connected to the bottom of the sliding block, and a movable pressure roller that abuts against the sloped top of the guide plate is installed at the bottom of the longitudinal push plate. The reversing mechanism is used to convert the up-and-down movement of the sliding block into the relative horizontal movement of the first sliding plate and the second sliding plate.

[0011] Preferably, one side of the guide plate is connected to a concave bracket that passes through the transverse movable groove on the support frame, and an auxiliary plate is fixed inside the concave bracket. Both the concave bracket and the auxiliary plate are provided with a rack structure.

[0012] Preferably, the support frame has two rotating shafts rotatably connected within it, and each rotating shaft has a lower drive gear and an upper drive gear fixed on it.

[0013] Preferably, the inner sidewall of the auxiliary plate or the concave bracket meshes with the lower drive gear; a first drive rack and a second drive rack are respectively fixed on the first sliding plate and the second sliding plate, and the first drive rack and the second drive rack mesh with two upper drive gears respectively.

[0014] Preferably, the support frame is further provided with two drive constraint mechanisms. The drive constraint mechanism includes a drive motor. The output end of the drive motor is connected to a push wheel through a drive wheel, a transmission belt, a driven wheel, and a driven shaft. The push wheel is used to push the C-shaped building steel to move after cutting, so that its cut end passes through the constraint gap of the positioning mechanism.

[0015] Preferably, the drive constraint mechanism further includes an inclined support plate fixed to the inner wall of the support frame, the top of the inclined support plate passing through a rectangular through slot at the top of the support frame and extending into the interior of the inverted C-shaped building steel; the driven shaft is rotatably connected to the top of the inclined support plate, and the push wheel is fixed to the driven shaft and located inside the C-shaped building steel.

[0016] The beneficial effects of this invention are: I. This invention uses an internal fixed frame to abut against the inside of the C-shaped building steel, and a bottom supporting frame and a top pressing frame to abut against the outside of the C-shaped building steel, to resist the outward or inward force when the C-shaped building steel is cut, ensuring that the C-shaped building steel will not twist inward or outward during the process of the circular saw cutting the C-shaped building steel.

[0017] II. This invention inverts the C-shaped structural steel, so that when positioning the C-shaped structural steel, its bottom opening faces downwards. Two internal fixing frames can directly pass through the bottom opening of the C-shaped structural steel to enter and position it inside. This internal positioning of the C-shaped structural steel requires no additional operation and does not occupy the space above. At the same time, the resulting C-shaped structural steel also allows the circular saw blade to first contact the non-open side of the C-shaped structural steel for cutting. The non-open side of the C-shaped structural steel has better compressive strength, reducing the risk of twisting during cutting. When cutting the open side of the C-shaped structural steel, most of the C-shaped structural steel has already been cut, further reducing the risk of twisting.

[0018] Third, the present invention transforms the up-and-down movement of the sliding block in the external positioning control mechanism, which drives the top pressing frame, into the relative horizontal movement of the two internal fixed frames in the internal positioning control mechanism through the reversing mechanism. This allows the device to not only adapt to the rapid positioning of C-shaped building steel, but also to ensure that the downward pressing of the top pressing frame and the outward expansion of the internal fixed frames are completed synchronously and in coordination, thereby improving the clamping efficiency and reliability in the inverted state.

[0019] Fourth, the present invention uses a drive constraint mechanism set in the support frame. The arrangement of the inclined support plate and the push wheel is adapted to the internal space when the C-shaped building steel is inverted. After the cutting is completed, the push wheel can push the C-shaped building steel along the inner top wall of the inverted C-shaped building steel, so that the end of the newly cut C-shaped building steel passes through the constraint gap of the positioning mechanism, thereby constraining and correcting the unique deformation that may be generated by the inverted cutting, and preventing the twisting of the end position of the C-shaped building steel. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is the present invention. Figure 1 Rear view of the central support frame; Figure 3 This is the present invention. Figure 2 A schematic diagram of the internal structure of the outer frame; Figure 4 This is the present invention. Figure 3 A schematic diagram of the structure of the middle guide plate from the side view; Figure 5 This is the present invention. Figure 1 A structural schematic diagram of the front view of the central support frame; Figure 6 This is the present invention. Figure 5 A sectional view of the side section of the central support frame; Figure 7 This is the present invention. Figure 6 Front view of the central support frame; Figure 8 This is the present invention. Figure 5 A top-view sectional view of the lower center drive gear; Figure 9 This is the present invention. Figure 5 A top-view sectional view of the upper central drive gear; Figure 10 This is the present invention. Figure 5 Schematic diagram of the inclined support plate section; Figure 11 This is the present invention. Figure 10 Rear view of the inclined support plate; Figure 12 This is a schematic diagram of the structure when the inner wall of the open end of the C-shaped building steel is twisted inward under pressure during shearing in the existing technology; Figure 13 This is a schematic diagram of the structure when the two sides of a C-shaped building steel are twisted outward under pressure during shearing in the existing technology.

[0021] The attached figures are labeled as follows: 1. Support frame; 2. Circular saw; 301. Bottom support frame; 302. Top clamping frame; 303. Internal fixing frame; 4. C-shaped structural steel; 201. Vertical support frame; 202. First electric telescopic rod; 501. Second electric telescopic rod; 502. Sliding block; 503. Double-end connecting plate; 504. Clamping sleeve; 505. Vertical slide groove; 601. Horizontal shaft; 602. First sliding plate; 603. Second sliding plate; 604. Connecting plate; 701. Outer frame; 702. Tension spring; 703. Guide plate; 704. Restricting slide groove; 705. Restricting plate; 70 6. Horizontal movable groove; 707. Concave bracket; 708. Auxiliary plate; 709. Rotating shaft; 710. Lower drive gear; 711. Upper drive gear; 712. First drive rack; 713. Second drive rack; 714. Longitudinal push plate; 715. Movable pressure roller; 801. Motor mounting base; 802. Side wall support plate; 803. Inclined support plate; 804. Rectangular through groove; 805. Drive motor; 806. Drive rod; 807. Drive wheel; 808. Driven shaft; 809. Driven wheel; 810. Push wheel; 811. Transmission belt; 812. Wear-resistant rubber. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] like Figure 1 , Figure 6 and Figure 7 A twist-resistant C-shaped building steel cutting device includes a support frame 1 and a circular saw 2. All electrical equipment in the cutting device, including the circular saw 2, is existing technology, externally powered, and has a corresponding control switch externally. A positioning mechanism is provided on the top of the support frame 1, which is used to position the C-shaped building steel 4 to be cut. The positioning mechanism includes a bottom support frame 301, two top clamping frames 302, and two internal fixing frames 303. The internal fixing frames 303 are adapted to the inner wall of the C-shaped building steel 4 and can fit tightly against the inner wall of the C-shaped building steel 4. The C-shaped building steel 4 is placed upside down with its opening facing down. The bottom support frame 301 is fixed to the top of the support frame 1, and the bottom of the inner wall of the bottom support frame 301 is inclined to fit the inclined surfaces on both sides of the inner wall of the opening end of the C-shaped building steel 4, so that it can just abut against the inclined surfaces on both sides of the inner wall of the opening end of the C-shaped building steel 4, providing stable support for the upside-down C-shaped building steel 4.

[0024] Both the support frame 1 and the bottom support frame 301 have a split opening located below the saw blade of the circular saw machine 2, which will not hinder the downward movement of the saw blade of the circular saw machine 2 to cut the inverted C-shaped building steel 4.

[0025] like Figure 1 and Figure 2 A support mechanism is provided on one side of the support frame 1. The support mechanism includes a vertical support frame 201. The bottom end of the vertical support frame 201 is fixedly connected to the support frame 1. A first electric telescopic rod 202 is fixedly installed on the top of the vertical support frame 201. The telescopic end of the first electric telescopic rod 202 passes through the vertical support frame 201 and is fixedly connected to the circular saw 2. It is used to drive the circular saw 2 to move up and down to cut the C-shaped building steel 4. like Figure 2 , Figure 3 and Figure 5 An external positioning control mechanism is provided on one side of the vertical support frame 201. The external positioning control mechanism includes a second electric telescopic rod 501, which is fixed to one side of the vertical support frame 201. A sliding block 502 is fixedly connected to the telescopic end of the second electric telescopic rod 501. A double-end connecting plate 503 is fixedly connected to the sliding block 502. A clamping sleeve 504 is fixedly connected to both ends of the double-end connecting plate 503. The two clamping sleeves 504 are respectively fixed to the outer surface of the two top clamping frames 302, so that when the second electric telescopic rod 501 telescopics, the top clamping frame 302 can move up and down through the sliding block 502, the double-end connecting plate 503 and the clamping sleeve 504. A vertical sliding groove 505 is provided on the vertical support frame 201. The sliding block 502 and the vertical sliding groove 505 are slidably connected to ensure the vertical movement of the sliding block 502, the double-end connecting plate 503 and the clamping sleeve 504.

[0026] like Figure 5 , Figure 6 , Figure 7 and Figure 9 The support frame 1 is equipped with an internal positioning control mechanism, which includes two parallel transverse shafts 601 fixed inside the support frame 1. A first sliding plate 602 and a second sliding plate 603 are slidably connected to the transverse shafts 601. The first sliding plate 602 and the second sliding plate 603 can move towards each other. The top of each of the first sliding plate 602 and the second sliding plate 603 is fixedly connected to two connecting plates 604. The two connecting plates 604 pass through the opening of the C-shaped building steel 4 (inverted state) and are fixedly connected to the internal fixed frame 303 located inside the C-shaped building steel 4, which can drive the internal fixed frame 303 to move towards each other.

[0027] like Figures 2-9The support frame 1 is equipped with a reversing mechanism, which is used to convert the up-and-down movement in the external positioning control mechanism into the relative horizontal movement of the two internal fixed frames 303 in the internal positioning control mechanism, so as to ensure the consistency of the internal and external fixation of the C-shaped building steel cutting device 4. like Figure 2 and Figure 3 The reversing mechanism includes an outer frame 701 fixed to one side of the support frame 1. A tension spring 702 is fixedly connected to the inner wall of the outer frame 701. A guide plate 703 is fixedly connected to the end of the tension spring 702. The top of the guide plate 703 is inclined. A limiting groove 704 is provided on the outer frame 701. A limiting plate 705 is fixedly connected to one side of the guide plate 703. The limiting plate 705 and the limiting groove 704 are slidably connected to ensure the lateral movement of the guide plate 703. like Figure 5 and Figure 8 The inner side of the support frame 1 is provided with a transverse movable groove 706. A concave bracket 707 is fixedly connected to one side of the guide plate 703. The concave bracket 707 passes through the transverse movable groove 706 and is slidably connected to the transverse movable groove 706. An auxiliary plate 708 is fixedly connected between the two sides of the inner wall of the concave bracket 707. A toothed structure is provided between the auxiliary plate 708 and the inner side wall of the concave bracket 707. like Figure 6 , Figure 7 and Figure 8 Two rotating shafts 709 are rotatably connected between the bottom and top of the inner wall of the support frame 1. A lower drive gear 710 and an upper drive gear 711 are fixedly connected to the rotating shafts 709. The upper drive gear 711 is located above the lower drive gear 710. The inner sidewalls of the auxiliary plate 708 and the concave bracket 707 mesh with the two lower drive gears 710 respectively. like Figure 5 and Figure 9 The first sliding plate 602 and the second sliding plate 603 are respectively fixedly connected to the side away from each other, and the first driving rack 712 and the second driving rack 713 respectively mesh with the two upper driving gears 711. like Figure 3 and Figure 4 The bottom of the sliding block 502 is fixedly connected to a longitudinal push plate 714. A movable pressure roller 715 is installed at the bottom of the longitudinal push plate 714. The movable pressure roller 715 abuts against the top of the guide plate 703. When the longitudinal push plate 714 drives the movable pressure roller 715 to move downward, the movable pressure roller 715 presses the inclined surface of the guide plate 703, which can push the guide plate 703 to move laterally.

[0028] like Figure 5 , Figure 7 , Figure 10 and Figure 11 The support frame 1 is provided with two drive constraint mechanisms, including a motor mounting base 801 and a side wall support plate 802. Both the motor mounting base 801 and the side wall support plate 802 are fixed to the inner wall of the support frame 1. One end of the side wall support plate 802 is fixedly connected to an inclined support plate 803. A rectangular through slot 804 is opened at the top of the support frame 1. The top of the inclined support plate 803 passes through the rectangular through slot 804 and the opening at the bottom of the C-shaped building steel 4 and extends into the interior of the C-shaped building steel 4. A drive motor 805 is fixedly connected to the top of the motor mounting base 801. A drive rod 806 is fixedly connected to the output end of the drive motor 805. The output end of the drive rod 806 passes through the bottom end of the inclined support plate 803 and is fixedly connected to a drive wheel 807. The outer surface of the drive rod 806 is rotatably connected to the inclined support plate 803 via bearings. A driven shaft 808 is rotatably connected to the top end of the inclined support plate 803 via bearings. A driven wheel 809 and a push wheel 810 are fixedly connected to both ends of the driven shaft 808, respectively, so that... Driven shaft 808, driven wheel 809 and push wheel 810 can rotate synchronously. A transmission belt 811 is provided between drive wheel 807 and driven wheel 809, and drive wheel 807 and driven wheel 809 are connected by transmission belt 811. Wear-resistant rubber 812 is fixedly connected to the outer surface of push wheel 810 to increase the friction between push wheel 810 and the top of the inner wall of C-shaped building steel. The drive motors 805 in the two constraint mechanisms can be controlled independently without ensuring the same direction or speed.

[0029] The working principle of this invention is as follows: When it is necessary to cut the C-shaped structural steel 4, the opening of the C-shaped structural steel 4 should face downwards and be placed on the bottom support frame 301, so that the beveled surfaces on both sides of the inner wall of the opening end of the C-shaped structural steel 4 are in contact with the beveled surfaces of the bottom support frame 301 (e.g., Figure 6 and Figure 7 At this time, the first sliding plate 602 and the second sliding plate 603 abut together, and through the connecting plate 604, the two internal fixed frames 303 abut together. When the opening of the C-shaped building steel 4 faces down and moves down, the two abutting internal fixed frames 303 can pass through the opening at the bottom of the C-shaped building steel 4 and enter the interior of the C-shaped building steel 4. Then the second electric telescopic rod 501 retracts, causing the sliding block 502 to move down. The sliding block 502 moves down, and through the double-end connecting plate 503 and the clamping sleeve 504, it causes the two top clamping frames 302 to move down, so that the double-end connecting plate 503 and the clamping sleeve 504 drive the top clamping frames 302 to fit against the top of the C-shaped building steel 4. Together with the bottom support frame 301, it is constrained to the outside of the C-shaped building steel 4, and external positioning of the cutting area is performed from the outside of the C-shaped building steel 4. like Figure 6 , Figure 7 , Figure 8 and Figure 9 During the downward movement of the sliding block 502, it also drives the longitudinal push plate 714 to press the movable pressure roller 715 downward. The movable pressure roller 715 presses the high part of the inclined surface of the guide plate 703, and the guide plate 703 moves in the direction of the tension spring 702. When the guide plate 703 moves, it drives the concave bracket 707 to move together. The concave bracket 707 drives the auxiliary plate 708 to move together. When the concave bracket 707 and the auxiliary plate 708 move, they drive the two lower drive gears 710 to rotate in opposite directions. The two lower drive gears 710 drive the two upper drive gears 711 to rotate in opposite directions through the rotating shaft 709. The two upper drive gears 711 drive the first drive rack 712 and the second drive rack 713 to move in a direction away from each other, and cause the first sliding plate 602 and the second sliding plate 603 to move in a direction away from each other. The first sliding plate 602 and the second sliding plate 603 drive the two internal fixed frames 303 to move away from each other through the connecting plate 604, so that the internal fixed frames 303 are attached to both sides of the inner wall of the C-shaped building steel 4. At this time, the first electric telescopic rod 202 is activated, which drives the circular saw 2 to move down and cut the C-shaped building steel 4. During the cutting process, since the internal fixed frame 303 is pressed against the inside of the C-shaped building steel 4, and the bottom supporting frame 301 and the top pressing frame 302 are pressed against the outside of the C-shaped building steel 4, it is ensured that the C-shaped building steel will not twist inward or outward during the cutting process.

[0030] like Figure 5 , Figure 10 and Figure 11 After the C-shaped steel 4 is cut, taking one set of constraint mechanisms as an example, the drive motor 805 drives the drive wheel 807 to rotate counterclockwise through the drive rod 806. The drive wheel 807 drives the driven wheel 809 to rotate counterclockwise. The driven wheel 809 drives the push wheel 810 to rotate counterclockwise through the driven shaft 808. The push wheel 810 pushes the cut C-shaped steel 4 by friction (if the friction is insufficient to push the cut C-shaped steel 4, it can be manually pulled to apply assistance, or the second electric telescopic rod 501 can be extended slightly to reduce the clamping force of the positioning mechanism on the C-shaped steel 4). This allows the cut end of the C-shaped steel 4 to pass through the positioning space formed by the external positioning formed by the bottom support frame 301 and the top pressing frame 302 and the internal fixing frame 303. When passing through this space, the cut end will be squeezed and constrained, so that the curled part can be restored before it can pass through, further preventing the twisting of the cut end of the C-shaped steel 4.

[0031] Then, the second electric telescopic rod 501 extends, pushing the sliding block 502 to move upward. The sliding block 502 drives the two top pressing frames 302 to move upward through the double-end connecting plate 503 and the pressing sleeve 504, so that the double-end connecting plate 503 and the pressing sleeve 504 drive the top pressing frame 302 to move upward and detach from the top of the C-shaped building steel 4. When the sliding block 502 moves upward, it drives the longitudinal push plate 714 and the movable pressure roller 715 to move upward. The movable pressure roller 715 no longer presses against the inclined surface of the guide plate 703. At this time, the tension spring 702 extends and pushes the guide plate 703. The concave bracket 707 drives the auxiliary plate 708 to move together. When the concave bracket 707 and the auxiliary plate 708 move, they drive the two lower drive gears 710 to rotate in opposite directions. The two lower drive gears 710 drive the two upper drive gears 711 to rotate in opposite directions through the rotating shaft 709. The two upper drive gears 711 drive the first drive rack 712 and the second drive rack 711 to rotate in opposite directions. The strip 713 moves towards each other, causing the first sliding plate 602 and the second sliding plate 603 to move towards each other. The first sliding plate 602 and the second sliding plate 603 drive the two internal fixed frames 303 to move closer to each other and abut together through the connecting plate 604, and are located above the bottom opening of the C-shaped building steel 4. Then the cut C-shaped building steel 4 can be removed by moving it upwards, so that the two internal fixed frames 303 are disengaged from the bottom opening of the C-shaped building steel 4, without affecting the removal of the C-shaped building steel 4, and the new C-shaped building steel 4 can be repositioned and cut.

[0032] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A C-shaped steel cutting device for preventing torsion, comprising a support frame (1) and a circular saw (2), characterized in that, The top of the support frame (1) is provided with a positioning mechanism for positioning the C-shaped building steel (4) to be cut; The positioning mechanism includes a bottom support frame (301) fixed to the top of the support frame (1), two top pressing frames (302) and two internal fixing frames (303), with the bottom of the inner wall of the bottom support frame (301) inclined. The cutting device also includes: An external positioning control mechanism is set on one side of the support mechanism to control the positioning mechanism to press the C-shaped building steel (4) from the outside; An internal positioning control mechanism is set inside the support frame (1) to control the positioning mechanism to internally tighten the C-shaped building steel (4); A reversing mechanism is set on the support frame (1) for converting the motion of the external positioning control mechanism into the motion of the internal positioning control mechanism.

2. The anti-torsion C-shaped building steel cutting device according to claim 1, characterized in that, A support mechanism is provided on one side of the support frame (1). The support mechanism includes a vertical support frame (201). A first electric telescopic rod (202) is installed on the vertical support frame (201). The telescopic end of the first electric telescopic rod (202) is fixedly connected to the circular saw (2) and is used to drive the circular saw (2) to move up and down.

3. The anti-torsion C-shaped building steel cutting device according to claim 1, characterized in that, The external positioning control mechanism includes a second electric telescopic rod (501), the telescopic end of which is connected to a sliding block (502), and the sliding block (502) is connected to two top pressing frames (302) through a double-end connecting plate (503) and a pressing sleeve (504).

4. The anti-torsion C-shaped building steel cutting device according to claim 3, characterized in that, The support frame (1) is provided with an internal positioning control mechanism, which includes a first sliding plate (602) and a second sliding plate (603). The tops of the first sliding plate (602) and the second sliding plate (603) are respectively fixedly connected to two internal fixed frames (303) through connecting plates (604).

5. The anti-torsion C-shaped building steel cutting device according to claim 4, characterized in that, The reversing mechanism includes an outer frame (701) fixed to one side of the support frame (1), a tension spring (702) fixed inside the outer frame (701), a guide plate (703) fixedly connected to one end of the tension spring (702), and the top of the guide plate (703) being an inclined surface; a longitudinal push plate (714) is connected to the bottom of the sliding block (502), and a movable pressure roller (715) abutting against the inclined surface of the guide plate (703) is installed at the bottom of the longitudinal push plate (714); The reversing mechanism is used to convert the up-and-down movement of the sliding block (502) into the relative horizontal movement of the first sliding plate (602) and the second sliding plate (603).

6. The anti-torsion C-shaped building steel cutting device according to claim 5, characterized in that, The guide plate (703) is connected to a concave bracket (707) that passes through the transverse movable groove (706) on the support frame (1). An auxiliary plate (708) is fixed inside the concave bracket (707). Both the concave bracket (707) and the auxiliary plate (708) are provided with rack and pinion structures.

7. The anti-torsion C-shaped building steel cutting device according to claim 6, characterized in that, The support frame (1) has two rotating shafts (709) rotatably connected inside, and each rotating shaft (709) has a lower drive gear (710) and an upper drive gear (711) fixed on it.

8. The anti-torsion C-shaped building steel cutting device according to claim 7, characterized in that, The inner wall of the auxiliary plate (708) or the concave bracket (707) meshes with the lower drive gear (710); the first sliding plate (602) and the second sliding plate (603) are respectively fixed with a first drive rack (712) and a second drive rack (713), and the first drive rack (712) and the second drive rack (713) mesh with two upper drive gears (711).

9. The anti-torsion C-shaped building steel cutting device according to claim 1, characterized in that, The support frame (1) is also provided with two drive constraint mechanisms. The drive constraint mechanism includes a drive motor (805). The output end of the drive motor (805) is connected to a push wheel (810) through a drive wheel (807), a transmission belt (811), a driven wheel (809), and a driven shaft (808). The push wheel (810) is used to push the C-shaped building steel (4) to move after cutting so that its cut end passes through the constraint gap of the positioning mechanism.

10. A C-shaped steel cutting device for preventing torsion according to claim 9, characterized in that, The drive constraint mechanism also includes an inclined support plate (803) fixed to the inner wall of the support frame (1), the top of the inclined support plate (803) passing through the rectangular through slot (804) at the top of the support frame (1) and extending into the interior of the inverted C-shaped building steel (4); the driven shaft (808) is rotatably connected to the top of the inclined support plate (803), and the push wheel (810) is fixed on the driven shaft (808) and located inside the C-shaped building steel (4).

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