Portable ratchet lever type steel pipe bending machine and bending method

Abstract

The present application relates to the technical field of steel pipe bending, and particularly relates to a portable ratchet lever type steel pipe bending machine and a bending method, which comprises: a first force arm and a second force arm connected through a deflection abutting structure, and an end of the first force arm is provided with a bending support part; a rotating sleeve, a plurality of groups of support bending rollers with different diameters are circumferentially and equidistantly arranged on the rotating sleeve, the center axes of the plurality of groups of support bending rollers are coplanar, and one group of support bending rollers is located on a pre-pressing station; a plurality of locking grooves are arranged, the locking grooves are matched with first convex shafts arranged in the rotating sleeve, and the plurality of groups of support bending rollers can be kept in a locked state when the plurality of groups of support bending rollers are rotated to the pre-pressing station; a driving rotating assembly, the driving rotating assembly can drive the first convex shafts to rotate after the first convex shafts are separated from the locking grooves; and a bending assembly, the bending assembly is connected with a surrounding pressure roller, and when the second force arm rotates relative to the first force arm, the surrounding pressure roller can be driven to rotate, the rapid and accurate switching of the support bending rollers is realized, and the use portability is improved.

Description

Technical Field

[0001] This invention relates to the field of steel pipe bending technology, specifically a portable ratchet lever type steel pipe bending machine and bending method. Background Technology

[0002] Portable ratchet lever-type steel pipe bending machines are widely used in on-site operations such as building installation, pipeline construction, and decoration due to their compact structure, lack of external power source, and flexible operation. In practical engineering applications, the bending radius of the steel pipe needs to be determined comprehensively based on various factors such as pipeline direction, installation space, and pipe diameter. The requirements for the bending radius vary significantly depending on the specific scenario.

[0003] To meet the processing requirements of different bending radii, existing technologies have developed bending machines equipped with multiple sets of support bending rollers of different diameters. These machines switch between different diameter support bending rollers at the working position by rotation, avoiding frequent manual disassembly and replacement of the mold. For example, Chinese patent CN118650046A discloses a bending device for cooling steel pipes using a turntable with multiple guide plates of different radii. The guide plates are switched by rotating the turntable, and a pressure rod presses the selected guide plate from top to bottom to prevent it from shifting. Another example is Chinese patent CN118455334A, which discloses a hydraulic composite bending device. This device uses a rotating operating table to sequentially switch bending wheels of different diameters to the bending position, and uses the engagement of a locking block and a locking groove to circumferentially position the turntable.

[0004] However, in actual operation, the existing rotary switching structure described above involves two separate steps: switching and locking. The operator must first manually or via motor-driven rotation of the turntable to switch the required diameter support bending roller (or template, bending wheel) to the working position, and then separately operate the locking mechanism (such as a pressure bar, locking block, etc.) to fix the switched component. This "switching first, locking later" step-by-step operation not only increases the number of steps and prolongs the switching time, but also requires the operator to perform an additional locking action after switching, reducing the smoothness and efficiency of on-site operations. Especially in situations requiring frequent changes in bending radius, repeated step-by-step operations significantly impact construction progress.

[0005] In addition, while some existing designs attempt to integrate switching and locking actions, they are often structurally complex or require additional power sources (such as motors or hydraulic cylinders), making them unsuitable for purely manual portable ratchet lever-type bending machines. Summary of the Invention

[0006] The purpose of this invention is to provide a portable ratchet lever-type steel pipe bending machine and bending method to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a portable ratchet lever-type steel pipe bending machine, comprising: a first lever arm and a second lever arm connected by a deflection abutment structure, wherein the end of the first lever arm is provided with a bending support portion; a rotating sleeve slidably mounted on the first lever arm and connected to a cylindrical spring sleeved on the first lever arm, wherein the rotating sleeve is provided with multiple sets of support bending rollers of different diameters at equidistant intervals around its circumference, the central axes of the multiple sets of support bending rollers being coplanar, wherein one set of support bending rollers is located in a pre-pressing position; and a locking groove provided with multiple sets of... The locking groove is equidistantly spaced on the circumferential surface of the first lever arm. The locking groove cooperates with the first convex shaft disposed in the rotating sleeve, which enables the multiple sets of supporting bending rollers to remain locked when they rotate to the pre-pressing position. The driving rotation assembly is disposed on the first lever arm, which can drive the first convex shaft to rotate after it separates from the locking groove. The bending assembly is connected to the second lever arm, and the bending assembly is connected to the confining pressure roller. When the second lever arm rotates relative to the first lever arm, it can drive the confining pressure roller to rotate around the central axis of the supporting bending roller.

[0008] The portable ratchet lever type steel pipe bending machine as described above: the deflection abutment structure includes an intermediate rod rotatably connected to the bending support, and one end of the intermediate rod away from the bending support is rotatably connected to the second lever arm; the deflection abutment structure also includes a stop kit disposed between the intermediate rod and the bending support, the stop kit being able to lock the intermediate rod when the intermediate rod rotates relative to the bending support by a predetermined angle.

[0009] The portable ratchet lever type steel pipe bending machine as described above: the stop kit includes a stop member disposed on the bending support and a right-angle abutment part disposed on the intermediate rod. When the stop member abuts against the right-angle abutment part, the second lever arm and the rotation axis of the intermediate rod are collinear with the central axis of the support bending roller located at the pre-pressing station.

[0010] The portable ratchet lever type steel pipe bending machine described above: multiple sets of first spiral surfaces are equidistantly arranged on the first lever arm, and the first spiral surfaces connect two adjacent sets of locking grooves; the first spiral surfaces can guide the first cam shaft to move toward the locking groove.

[0011] The portable ratchet lever type steel pipe bending machine as described above: the drive rotation assembly includes a sliding sleeve slidably sleeved on the first lever arm and an arc plate disposed on the sliding sleeve, the end of the arc plate away from the sliding sleeve is provided with a second helical surface; the drive rotation assembly also includes a second convex shaft disposed on the outer circumferential wall of the rotating sleeve, the second convex shaft abutting and adapting to the second helical surface.

[0012] The portable ratchet lever type steel pipe bending machine described above: a limiting block is provided along the length of the first lever arm, and a limiting groove is provided on the inner wall of the sliding sleeve, with the limiting block and the limiting groove slidingly engaged.

[0013] The portable ratchet lever type steel pipe bending machine as described above: the bending assembly includes a rotating component rotatably connected to the intermediate rod, the rotating component being rotatably connected to the second lever arm, and a ratchet coaxial with its rotation axis is provided on the rotating component. The ratchet is adapted to a pawl provided on the second lever arm, and a torsion spring is provided on the rotation axis of the pawl. A lever is also rotatably mounted on the second lever arm, the lever passing through the second lever arm and connected to the rotation axis of the pawl.

[0014] The portable ratchet lever type steel pipe bending machine as described above: the bending assembly further includes a groove provided on the rotating part, a slider is slidably installed in the groove, the slider is rotatably connected to the pressure roller; a threaded sleeve is provided on the side of the slider, and the threaded sleeve is threadedly connected to a threaded rod provided on the rotating part.

[0015] A method for bending a steel pipe using the aforementioned portable ratchet lever type steel pipe bending machine includes the following steps: Step 1: Determine the required bending radius of the steel pipe based on the actual installation conditions; Step 2: Place the first lever arm vertically, so that the second lever arm is located below the first lever arm, and control the drive rotation component to move so that the rotating sleeve can move along the length of the first lever arm so that the first cam shaft separates from the locking groove. Step 3: After the first convex shaft separates from the locking groove, it can enter the corresponding locking groove under the guidance of the first spiral surface, so that the support bending rollers of different radii can be switched to the pre-pressing station. Step 4: Repeat steps 2 and 3 above until the support bending roller of the corresponding diameter is switched to the pre-pressing station; Step 5: Load the steel pipe, press the second lever arm to drive the surrounding pressure roller to rotate, and bend the steel pipe.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. By coordinating the drive rotating assembly with the second convex shaft on the rotating sleeve, the first helical surface on the first lever arm, and the cylindrical spring, an integrated continuous action of "unlocking-rotating-locking" is achieved. The operator only needs to push the sliding sleeve axially to complete the following sequentially: the first convex shaft separates from the locking groove, the rotating sleeve rotates automatically under the spring force, and the first convex shaft is guided into the next set of locking grooves along the first helical surface. The entire process does not require step-by-step operation or additional locking action, which greatly simplifies the switching process of the support bending roller. It is especially suitable for on-site operation scenarios that require frequent changes in bending radius, effectively improving construction efficiency. 2. Through the axial engagement of the first convex shaft and the locking groove, the rotating sleeve always remains axially locked before and after switching and during bending operations. This structure can directly bear and resist the axial component force generated by the bending load, preventing unexpected axial movement of the support bending roller, thereby ensuring precise alignment of the support bending roller with the pressure roller and the bending support. This avoids surface scratches and friction damage to the steel pipe caused by positional misalignment, as well as deformation defects such as torsion and warping of the steel pipe after bending, significantly improving the bending forming quality. 3. On the one hand, the adjustability of the initial angle allows the operator to choose the most effortless starting posture according to their own strength and working conditions, improving the ease of operation of the equipment; on the other hand, the reciprocating drive of the ratchet mechanism can achieve large-angle bending without increasing the lever length, significantly expanding the processing range while maintaining the compactness and portability of the equipment. Attached Figure Description

[0017] Figure 1 A schematic diagram of a portable ratchet lever-type steel pipe bending machine; Figure 2 This is a structural diagram of a portable ratchet lever-type steel pipe bending machine from another angle. Figure 3 This is a schematic diagram of the first lever arm, rotating sleeve, and drive rotation assembly in a portable ratchet lever-type steel pipe bending machine. Figure 4 Exploded view of the first lever arm, rotating sleeve, and drive rotation assembly in a portable ratchet lever-type steel pipe bending machine; Figure 5 for Figure 4 Enlarged view of the structure at point A in the middle; Figure 6 for Figure 4 Enlarged view of the structure at point B; Figure 7 This is a schematic diagram of the rotating sleeve and supporting bending roller in a portable ratchet lever-type steel pipe bending machine. Figure 8 A schematic diagram of the structure of a portable ratchet lever-type steel pipe bending machine, showing how the intermediate rod deflects to switch the support bending rollers; Figure 9 This is a schematic diagram of the bending assembly in a portable ratchet lever-type steel pipe bending machine; Figure 10 This is a schematic diagram of the bending assembly in a portable ratchet lever-type steel pipe bending machine from another angle.

[0018] In the diagram: 1. First lever arm; 101. Limiting block; 102. Locking groove; 103. First helical surface; 2. Second lever arm; 3. Bending support part; 301. Stop part; 4. Sliding sleeve; 401. Limiting groove; 5. Arc plate; 501. Second helical surface; 6. Rotating sleeve; 601. First convex shaft; 602. Second convex shaft; 7. Support bending roller; 8. Cylindrical spring; 9. Intermediate rod; 901. Right angle abutment part; 10. Rotating part; 1001. Slide groove; 11. Slider; 12. Threaded sleeve; 13. Threaded rod; 14. Enclosing pressure roller; 15. Ratchet; 16. Pad; 17. Lever. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0020] Please see Figures 1-10 As an embodiment of the present invention, the portable ratchet lever type steel pipe bending machine includes: a first lever arm 1, a second lever arm 2, a rotating sleeve 6, a locking groove 102, a drive rotation assembly, and a bending assembly.

[0021] The first lever arm 1 and the second lever arm 2 are connected by a deflection abutment structure. The end of the first lever arm 1 is provided with a bending support part 3. The deflection abutment structure includes an intermediate rod 9 rotatably connected to the bending support part 3. The end of the intermediate rod 9 away from the bending support part 3 is rotatably connected to the second lever arm 2. The deflection abutment structure also includes a stop kit disposed between the intermediate rod 9 and the bending support part 3. The stop kit can lock the intermediate rod 9 when the intermediate rod 9 rotates relative to the bending support part 3 by a predetermined angle. The stop kit includes a stop member 301 disposed on the bending support part 3 and a right-angle abutment part 901 disposed on the intermediate rod 9. When the stop member 301 abuts against the right-angle abutment part 901, the rotation axis of the second lever arm 2 and the intermediate rod 9 is collinear with the central axis of the support bending roller 7 located at the pre-pressing station.

[0022] In this application, to facilitate the switching of support bending rollers 7 with different diameters, multiple sets of support bending rollers 7 are arranged in a circle. During switching, multiple sets of support bending rollers 7 move in a circle. During the bending process, the pressure roller 14 moves in a circle around the central axis of the support bending roller 7 with the corresponding diameter. This requires the rotation axis of the second lever arm 2 to be concentric with the support bending roller 7 with the corresponding diameter. At this time, when the intermediate rod 9 rotates at a predetermined angle, it will inevitably be at the same height as the support bending roller 7 with the corresponding diameter. This will interfere with the rotation of multiple sets of support bending rollers 7, causing them to be unable to rotate.

[0023] In this embodiment, when it is necessary to switch the position of the supporting bending roller 7, the first lever arm 1 can be placed vertically upward. At this time, the second lever arm 2 and the intermediate rod 9 are located below the first lever arm, so that under the action of gravity, the first lever arm 1, the second lever arm 2 and the intermediate rod 9 can be in a straight state. At this time, during the switching of the supporting bending roller 7, the second lever arm 2 and the intermediate rod 9 will not interfere with the switching of the supporting bending roller 7, providing a good positional basis for the stable switching of the supporting bending roller 7.

[0024] Please see Figures 3-5 , Figure 7 The rotating sleeve 6 is slidably mounted on the first lever arm 1 and connected to the cylindrical spring 8 sleeved on the first lever arm 1. Multiple sets of support bending rollers 7 with different diameters are equidistantly arranged on the rotating sleeve 6. The central axes of the multiple sets of support bending rollers are coplanar. One set of support bending rollers 7 is in the pre-pressing position. By setting support bending rollers 7 with different diameters, the radius of the steel pipe bending point can be changed accordingly when the support bending rollers 7 of the corresponding diameter cooperate with the confining pressure roller 14, thereby meeting the installation requirements of the steel pipe under different working conditions.

[0025] In this case, the aforementioned cylindrical spring 8 is in a compressed state, which causes the rotating sleeve 6 to tend to move toward the locking groove 102 under the action of the elastic force provided by the cylindrical spring 8, thereby ensuring the stability of the first convex shaft 601 in the engagement state with the locking groove 102.

[0026] The locking grooves 102 are provided in multiple sets and are equidistantly arranged on the circumferential surface of the first lever arm 1. The locking grooves 102 cooperate with the first convex shaft 601 provided in the rotating sleeve 6, so that when the multiple sets of supporting bending rollers 7 rotate to the pre-pressing position, they remain locked. The first lever arm 1 is provided with multiple sets of first helical surfaces 103 equidistantly arranged on the circumferential surface. The first helical surfaces 103 connect two adjacent sets of locking grooves 102. The first helical surfaces 103 can guide the first convex shaft 601 to move toward the locking grooves 102.

[0027] In this embodiment, in the initial state, the first convex shaft 601 is located in one of the locking grooves 102. At this time, the cooperation between the first convex shaft 601 and the locking groove 102 keeps the rotating sleeve 6 and the first lever arm 1 in an axially locked state. This axial locking can ensure that the corresponding supporting bending roller 7, bending support part 3 and confining pressure roller 14 are in the same vertical space, thereby avoiding scratches on the surface of the steel pipe due to misalignment of the three during the bending process, or even causing the steel pipe to twist after bending, effectively ensuring the bending quality.

[0028] When the bending radius of the steel pipe needs to be changed to meet the installation requirements of different working conditions, the drive rotation assembly is activated to lift the rotating sleeve 6 upwards. During this process, the cylindrical spring 8 is further compressed and stores elastic potential energy, while the first convex shaft 601 moves along the length of the locking groove 102 until it is completely disengaged from the locking groove 102. Subsequently, the drive rotation assembly and the cylindrical spring 8 cooperate to apply a rotational force to the rotating sleeve 6, causing the first convex shaft 601 to move toward the first helical surface 103 connected to the locking groove 102, and enter another set of corresponding locking grooves 102 along the first helical surface 103. At this time, the support bending roller 7 of the corresponding diameter switches to the pre-pressing position. After the switching is completed, the first convex shaft 601 cooperates with the new locking groove 102 to produce an axial locking effect again, ensuring that the switched support bending roller 7, the bending support part 3, and the surrounding pressure roller 14 remain in the same vertical space.

[0029] Based on the above settings, the precise positioning of the front and rear support bending rollers 7 is achieved through the cooperation of the first convex shaft 601 and the locking groove 102, which prevents the steel pipe surface from being scratched or twisted during bending due to switching deviation, thus improving the bending quality. At the same time, the elastic potential energy of the cylindrical spring 8 is used to assist in the rotational switching, making the operation smoother and more efficient.

[0030] Please see Figures 3-4 , Figures 6-8 The driving rotation assembly is disposed on the first lever arm 1. The driving rotation assembly can drive the first convex shaft 601 to rotate after separating from the locking groove 102. The driving rotation assembly includes a sliding sleeve 4 slidably sleeved on the first lever arm 1 and an arc plate 5 disposed on the sliding sleeve 4. The arc plate 5 is provided with a second helical surface 501 at one end away from the sliding sleeve 4. The driving rotation assembly also includes a second convex shaft 602 disposed on the outer circumference of the rotating sleeve 6. The second convex shaft 602 abuts and is adapted to the second helical surface 501. The first lever arm 1 is provided with a limiting block 101 along its length direction. The inner wall of the sliding sleeve 4 is provided with a limiting groove 401. The limiting block 101 and the limiting groove 401 are slidably engaged.

[0031] In this embodiment, initially, the second convex shaft 602 and the second helical surface 501 are separated. When it is necessary to switch the support bending roller 7, the sliding sleeve 4 is pushed towards the rotating sleeve 6. During this process, the second helical surface 501 abuts against the second convex shaft 602. At this time, the first convex shaft 601 has not yet separated from the locking groove 102, so the second helical surface 501 only acts on the second convex shaft 602 and drives the rotating sleeve 6 to move towards the cylindrical spring 8, causing the cylindrical spring 8 to be further compressed and stored. When the first convex shaft 601 is completely disengaged from the locking groove 102, the cylindrical spring 8 releases its elastic force, pushing the second convex shaft 602 to move along the second helical surface 501, applying a rotational torque to the rotating sleeve 6. At the same time, the first convex shaft 601 moves along the first helical surface 103 and is guided into another set of locking grooves 102, so that the rotating sleeve 6 is locked again.

[0032] Based on the above settings, the smooth transition from axial motion to rotational motion is achieved through the cooperation of the second helical surface 501 and the second convex shaft 602. During the switching process, the energy storage and release of the cylindrical spring 8 enables the rotating sleeve 6 to automatically complete the repositioning and locking without additional operation. At the same time, the rotating sleeve 6 remains locked before and after the switching, effectively avoiding the misalignment problem between the supporting bending roller 7 and the surrounding pressure roller 14 caused by positional offset, thus ensuring the stability of the workpiece and the forming quality during the bending process.

[0033] Please see Figure 2 , Figures 8-10 The bending assembly is connected to the second lever arm 2, and a pressure roller 14 is connected to the bending assembly. When the second lever arm 2 rotates relative to the first lever arm 1, it can drive the pressure roller 14 to rotate around the central axis of the supporting bending roller 7. The bending assembly includes a rotating component 10 rotatably connected to the intermediate rod 9. The rotating component 10 is rotatably connected to the second lever arm 2, and a ratchet 15 coaxial with its rotation axis is provided on the rotating component 10. The ratchet 15 is adapted to a pawl 16 provided on the second lever arm 2, and a torsion spring is provided on the rotation axis of the pawl 16.

[0034] A lever 17 is rotatably mounted on the second lever arm 2. The lever 17 passes through the second lever arm 2 and is connected to the pivot of the pawl 16. By moving the lever 17, the pawl 16 can be separated from the ratchet 15, thereby adjusting the initial angle of the rotating part 10.

[0035] In this embodiment, during the bending operation, one end of the steel pipe is placed inside the bending support 3, and the area to be bent is placed on the supporting bending roller 7, while the surrounding pressure roller 14 presses against the surface of the steel pipe. Subsequently, the second lever arm 2 is applied, causing it to rotate relative to the intermediate rod 9. At this time, the pawl 16 and the ratchet 15 are engaged, and the ratchet 15 drives the rotating component 10 connected to it to rotate, causing the surrounding pressure roller 14 to make a circular motion around the central axis of the supporting bending roller 7, thereby bending the steel pipe.

[0036] Through the cooperation of ratchet 15 and pawl 16, the initial angles of the first lever arm 1 and the second lever arm 2 can be flexibly adjusted according to the operator's habits, so that the best mechanical effect can be obtained at the beginning of the bending. At the same time, this structure allows the second lever arm 2 to swing back and forth, and achieves large-angle bending of the steel pipe through multiple actions, effectively breaking through the limitation of single operation stroke.

[0037] Based on the above settings, on the one hand, the adjustability of the initial angle allows the operator to choose the most effortless starting posture according to their own strength and working conditions, improving the ease of operation of the equipment; on the other hand, the reciprocating drive of the ratchet mechanism can achieve large-angle bending without increasing the lever length, significantly expanding the processing range while maintaining the compactness and portability of the equipment.

[0038] The bending assembly also includes a slide groove 1001 disposed on the rotating component 10, a slider 11 is slidably installed in the slide groove 1001, the slider 11 is rotatably connected to the pressure roller 14; a threaded sleeve 12 is disposed on the side of the slider 11, and the threaded sleeve 12 is threadedly connected to a threaded rod 13 disposed on the rotating component 10.

[0039] In this embodiment, since the central axes of the multiple sets of supporting bending rollers 7 are coplanar, the top heights of the supporting bending rollers 7 with different diameters vary. When the steel pipe is placed on the bending support 3 and the supporting bending rollers 7, the threaded rod 13 is rotated, causing the threaded sleeve 12 to drive the slider 11 to move along the length direction of the slide groove 1001, thereby adjusting the initial position of the pressure roller 14 so that it can accurately press against the surface of the steel pipe, avoiding excessive gap between the pressure roller 14 and the supporting bending roller 7, which would cause the bending radius to exceed the preset value.

[0040] Based on the above settings, the initial position of the pressure roller 14 can be precisely adjusted through the cooperation of the threaded rod 13 and the threaded sleeve 12. This allows it to adapt to the height changes caused by the support bending roller 7 of different diameters, ensuring that the pressure roller 14 is in close contact with the steel pipe at the beginning of the bending process. This eliminates the influence of gaps on the bending radius and ensures the accuracy and consistency of the bending process.

[0041] As an embodiment of the present invention, a method for bending steel pipes using the aforementioned portable ratchet lever type steel pipe bending machine is also proposed, comprising the following steps: Step 1: Determine the required bending radius of the steel pipe based on the actual installation conditions; Step 2: Place the first lever arm 1 vertically, so that the second lever arm 2 is located below the first lever arm 1, and control the drive rotation component to move so that the rotating sleeve 6 can move along the length direction of the first lever arm 1, so that the first convex shaft 601 is separated from the locking groove 102. Step 3: After the first convex shaft 601 separates from the locking groove 102, it can enter the corresponding locking groove 102 under the guidance of the first spiral surface 103, so that the support bending rollers 7 of different radii can be switched to the pre-pressing station. Step 4: Repeat steps 2 and 3 above until the support bending roller 7 of the corresponding diameter is switched to the pre-pressing station; Step 5: Load the steel pipe and press the second lever arm 2 to drive the surrounding pressure roller 14 to rotate, bending the steel pipe.

[0042] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0043] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A portable ratchet lever type steel pipe bending machine, comprising: A first lever arm and a second lever arm are connected by a deflection abutment structure. The end of the first lever arm is provided with a bending support portion. The structure is characterized by further comprising: a rotating sleeve, slidably mounted on the first lever arm and connected to a cylindrical spring sleeved on the first lever arm; the rotating sleeve is provided with multiple sets of support bending rollers of different diameters at circumferential intervals, the central axes of the multiple sets of support bending rollers being coplanar, one set of support bending rollers being in a pre-pressing position; a locking groove, provided with multiple sets and circumferentially equidistantly formed on the circumferential surface of the first lever arm; the locking groove cooperates with a first convex shaft provided within the rotating sleeve, enabling the multiple sets of support bending rollers to remain locked when rotated to the pre-pressing position; a driving rotation assembly, provided on the first lever arm, capable of driving the first convex shaft to rotate after separating from the locking groove; and a bending assembly, connected to the second lever arm, with a confining pressure roller connected to the bending assembly, capable of driving the confining pressure roller to rotate about the central axis of the support bending roller when the second lever arm rotates relative to the first lever arm.

2. The portable ratchet lever type steel pipe bending machine according to claim 1, characterized in that, The deflection abutment structure includes an intermediate rod rotatably connected to the bending support portion, with one end of the intermediate rod away from the bending support portion rotatably connected to the second lever arm; the deflection abutment structure also includes a stop kit disposed between the intermediate rod and the bending support portion, the stop kit being able to lock the intermediate rod when the intermediate rod rotates relative to the bending support portion by a predetermined angle.

3. A portable ratchet lever type steel pipe bending machine according to claim 2, characterized in that, The stop kit includes a stop member disposed on the bending support and a right-angle abutment portion disposed on the intermediate rod. When the stop member abuts against the right-angle abutment portion, the second lever arm and the rotation axis of the intermediate rod are collinear with the central axis of the support bending roller located at the pre-pressing station.

4. A portable ratchet lever type steel pipe bending machine according to claim 1, characterized in that, The first lever arm has multiple sets of first helical surfaces arranged equidistantly in a circle, and the first helical surfaces connect two adjacent sets of locking grooves; the first helical surfaces can guide the first convex shaft to move toward the locking groove.

5. A portable ratchet lever type steel pipe bending machine according to claim 1, characterized in that, The drive rotation assembly includes a sliding sleeve slidably sleeved on the first lever arm and an arc-shaped plate disposed on the sliding sleeve. The end of the arc-shaped plate away from the sliding sleeve is provided with a second helical surface. The drive rotation assembly also includes a second convex shaft disposed on the outer circumferential wall of the rotating sleeve. The second convex shaft abuts and adapts to the second helical surface.

6. A portable ratchet lever type steel pipe bending machine according to claim 5, characterized in that, The first lever arm is provided with a limiting block along its length, and the inner wall of the sliding sleeve is provided with a limiting groove, and the limiting block and the limiting groove are slidably engaged.

7. A portable ratchet lever type steel pipe bending machine according to claim 2, characterized in that, The bending assembly includes a rotating component rotatably connected to the intermediate rod, the rotating component being rotatably connected to the second lever arm, and a ratchet coaxial with the rotating shaft on the rotating component. The ratchet is adapted to a pawl on the second lever arm, and a torsion spring is provided on the rotating shaft of the pawl. A lever is also rotatably mounted on the second lever arm, the lever passing through the second lever arm and connected to the rotating shaft of the pawl.

8. A portable ratchet lever type steel pipe bending machine according to claim 7, characterized in that, The bending assembly further includes a groove disposed on the rotating component, in which a slider is slidably mounted, and the slider is rotatably connected to the pressure roller; a threaded sleeve is disposed on the side of the slider, and the threaded sleeve is threadedly connected to a threaded rod disposed on the rotating component.

9. A method for bending steel pipes using a portable ratchet lever type steel pipe bending machine as described in claim 4, characterized in that, Includes the following steps: Step 1: Determine the required bending radius of the steel pipe based on the actual installation conditions; Step 2: Place the first lever arm vertically, so that the second lever arm is located below the first lever arm, and control the drive rotation component to move so that the rotating sleeve can move along the length of the first lever arm so that the first cam shaft separates from the locking groove. Step 3: After the first convex shaft separates from the locking groove, it can enter the corresponding locking groove under the guidance of the first spiral surface, so that the support bending rollers of different radii can be switched to the pre-pressing station. Step 4: Repeat steps 2 and 3 above until the support bending roller of the corresponding diameter is switched to the pre-pressing station; Step 5: Press the second lever arm to drive the surrounding pressure roller to rotate and bend the steel pipe.

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