Rectangular steel pipe bending equipment

Abstract

The invention belongs to the technical field of steel pipe machining, and particularly relates to rectangular steel pipe bending equipment which comprises a supporting platform, a positioning mechanism and a bending mechanism. A protection box is arranged on the front side of the middle of the upper end face of the supporting platform, avoiding holes are formed in the middle of the upper end face of the protection box in a bilateral symmetry mode, the positioning mechanism is used for positioning the bent position of a to-be-bent rectangular steel pipe and adjusting the bending radius of the rectangular steel pipe, and the bending mechanism is used for bending the two sides of the rectangular steel pipe at the same time in the bilateral clamping state. According to the rectangular steel pipe bending equipment disclosed by the invention, bending and rolling clamping positioning are synchronously carried out on the two sides, so that the situation that the rectangular steel pipe is crushed due to non-uniform bending moment distribution or excessive concentration in the bending process of the rectangular steel pipe is greatly reduced, and the forming yield of bending of the rectangular steel pipe is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of steel pipe processing, in particular to rectangular steel pipe bending equipment. Background Art

[0002] Rectangular steel pipe is a hollow square cross-section light thin-walled steel pipe, also known as steel cold-bent profile. It is a square cross-sectional shape and size steel made of Q235 hot-rolled or cold-rolled strip steel or coil as the base material, which is formed by cold bending and then high-frequency welding. In addition to the thickening of the wall thickness, the corner size and edge straightness of the hot-rolled extra-thick-walled square pipe reach or even exceed the level of the resistance-welded cold-formed square pipe.

[0003] Existing rectangular steel pipe bending equipment generally consists of a group of parallel columns with an extension rod on one side. A bearing is fixed to the rotating end of the extension rod. The rectangular steel pipe is placed in the middle of the two columns, and then the extension rod is rotated to achieve bending of the rectangular steel pipe.

[0004] There are some problems. For example, in actual use, since the rectangular steel tube is a hollow tube with a rectangular cross-section, when it is bent on one side, the bending moment will be unevenly distributed or concentrated, resulting in crushing, which not only wastes steel but also reduces work efficiency. For this reason, we propose a rectangular steel tube bending equipment. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a rectangular steel pipe bending device, which can solve the problem of high workpiece defect rate caused by unilateral force bending by performing bending and rolling clamping positioning on both sides simultaneously.

[0006] To achieve the above object, the present invention provides the following technical solutions: Rectangular steel tube bending equipment, including a support platform, a positioning mechanism and a bending mechanism; A protection box is provided at the front middle part of the upper end surface of the support platform, and avoidance holes are symmetrically provided on the upper end surface of the protection box; The positioning mechanism includes a support frame, a limiting rectangular frame, a screw rod, a slider and a mounting column. There are two support frames, which are symmetrically arranged at the middle rear side of the upper end surface of the support platform. The top ends of the two support frames are fixedly connected to the limiting rectangular frame. The front and rear walls of the limiting rectangular frame are rotatably connected with a screw rod. The outer side of the screw rod is threadedly connected with a slider. The slider is slidably connected to the inner wall of the limiting rectangular frame. The upper end surface of the slider is provided with a mounting column, and the upper end of the outer side surface of the mounting column is provided with a thread. The bending mechanism includes a stepper motor, a worm, a rotating shaft, a worm gear 1, a worm gear 2 and an L-shaped driving arm. The stepper motor is arranged in the middle of the front side surface of the protective box. The worm is rotatably connected to the front and rear inner walls of the protective box through a bearing. The end face of the output shaft of the stepper motor is fixedly connected to the front end face of the worm. The rotating shaft is symmetrically arranged on the left and right sides of the upper end face of the supporting platform. Worm gear 1 is fixedly connected to the middle of the outer side surface of the rotating shaft on the left, and worm gear 2 is fixedly connected to the middle of the outer side surface of the rotating shaft on the right. Worm gear 1 and worm gear 2 are respectively meshed and linked to the worm. The rotation directions of worm gear 1 and worm gear 2 are opposite. The upper end faces of the two rotating shafts are fixedly linked to the L-shaped driving arm, and a clamping assembly is arranged on the rear side of the L-shaped driving arm.

[0007] Furthermore, the positioning mechanism also includes a limiting ring and a locking nut, the limiting ring is rotatably connected to the outer side surface of the mounting column, and the locking nut is threadedly connected to the upper end of the outer side surface of the mounting column.

[0008] Furthermore, the clamping assembly includes a support, a connecting rod, a clamping arm 1, a sleeve, a sliding column, a clamping arm 2, a spring and a screw rod 2. The supports are symmetrically arranged on the rear side surfaces of the two L-shaped driving arms at equal distances and up and down. The two upper and lower adjacent supports are rotatably connected with a connecting rod through a pin shaft, and the rear end of each connecting rod is also rotatably connected with the support. The rear end surfaces of the supports at the rear ends of the two connecting rods rotatably connected to the same L-shaped driving arm are fixedly connected with the clamping arm 1, the rear side surfaces of the clamping arm 1 are symmetrically fixedly connected with the sleeve, the middle part of the sleeve is slidably connected with the sliding column, the rear end surfaces of the sliding column located on the same clamping arm 1 are fixedly connected with the clamping arm 2, a spring is arranged between the rear end surface of each sleeve and the front and rear adjacent clamping arm 2, the springs are fixedly sleeved on the outer side surfaces of each sliding column, and the screw rod 2 is rotatably connected between the relative inner side surfaces of the front and rear adjacent clamping arm 1 and clamping arm 2.

[0009] Furthermore, the clamping assembly also includes a limiting column and a rotating ring. The limiting columns are equidistantly arranged on the upper end surfaces of each clamping arm 1 and clamping arm 2, and the outer side surface of each limiting column is rotatably connected to two rotating rings.

[0010] Furthermore, the outer circumference of the limit column is fixedly connected to the upper limit baffle and the lower limit baffle, the two rotating rings on the same limit column are both located between the upper limit baffle and the lower limit baffle, an upper torsion spring is arranged between the upper rotating ring and the upper limit baffle, the two ends of the upper torsion spring are respectively plugged into the assembly holes of the upper rotating ring and the upper limit baffle, an upper clamping groove is arranged from bottom to top on the lower end surface of the upper rotating ring, the upper clamping groove extends in both radial and axial directions of the rotating ring, and the depth of the upper clamping groove in the radial direction of the rotating ring gradually increases. Gradually increases, the maximum depth of the upper groove along the radial direction of the rotating ring is less than the deformation of the upper torsion spring, a lower torsion spring is arranged between the rotating ring and the lower limit baffle at the bottom, the two ends of the lower torsion spring are respectively plugged into the assembly holes of the rotating ring and the lower limit baffle at the bottom, a lower groove is arranged on the upper end surface of the rotating ring at the bottom, the lower groove extends in the radial and axial directions of the rotating ring, the depth of the lower groove in the radial direction of the rotating ring gradually increases, and the maximum depth of the lower groove along the radial direction of the rotating ring is less than the deformation of the lower torsion spring.

[0011] Furthermore, the clamping assembly also includes ball casters, which are respectively arranged on the lower end surfaces of the clamping arm 1 and the clamping arm 2.

[0012] Furthermore, the rear ends of the screw rod 1, the screw rod 2 on the left side, and the screw rod 2 on the right side are respectively provided with hand wheel 1, hand wheel 2, and hand wheel 3.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. The rectangular steel tube bending equipment disclosed in the present invention performs bending and rolling clamping positioning on both sides simultaneously, which greatly reduces the crushing of the rectangular steel tube due to uneven distribution or excessive concentration of bending moment during the bending process, thereby improving the yield rate of the rectangular steel tube bending.

[0014] 2. Whether it is a round steel pipe or a rectangular steel pipe, the displacement of the parts on both sides of the bend is large during the bending process, so the pipe bending machine is equipped with a limit mechanism. When bending a round steel pipe, the grooved wheel can be used to achieve its double-sided positioning. However, since the rectangular steel pipe has four edges, the use of traditional grooved wheels can only achieve line-to-line contact between the limit mechanism and the pipe, which cannot guarantee the stability and safety of the bending process.

[0015] In order to solve the above problems, the applicant has made an improved design for the clamping assembly that plays a limiting role in the present invention, so that it can realize the simultaneous clamping and positioning of the four sides of the rectangular steel pipe, specifically: An upper clamping groove and a lower clamping groove are respectively arranged at opposite ends of the two rotating rings on the same limiting column. The upper clamping groove forms two clamping surfaces at the lower end of the upper rotating ring, and the lower clamping groove forms two clamping surfaces at the upper end of the lower rotating ring. The four rotating rings on the two opposite limiting columns respectively limit the two sides of the four edges of the rectangular steel pipe, which greatly improves the posture stability of the rectangular steel pipe during dynamic changes.

[0016] Although the addition of upper and lower clamping grooves achieves the purpose of limiting the rectangular steel pipe during the bending process, the conventional circular groove design will also limit the rectangular steel pipe in the non-processing state, resulting in inconvenience in taking and placing the pipe fittings. The distance between clamping arm one and clamping arm two needs to be adjusted each time the material is loaded and unloaded, resulting in low processing efficiency. The present invention specifically defines the shapes of the upper and lower slots, and the depth of the upper slot in the radial direction of the rotating ring gradually increases, wherein one end of the upper slot coincides with the outer wall of the rotating ring, and when the rectangular steel pipe is bent, the parts on both sides of the bend enter the upper slot from the outer wall of the rotating ring, and the rotating ring rotates along the limiting column under the action of force, so that the outer side of the body of the rectangular steel pipe gradually enters the depth of the upper slot, and at this time, the upper surface and the inner surface of the upper slot are in surface-to-surface contact with the rectangular steel pipe, providing a double-sided limit for one of the edges of the rectangular steel pipe, and when the rectangular steel pipe is bent, the torsion spring drives the rotating ring to return to its original position, and the rectangular steel pipe is moved out of the upper slot, and the matching principle of the lower slot and the rectangular steel pipe is similar to that of the upper slot, which will not be repeated, and the staff or the mechanical arm can remove the bent pipe fitting. The present invention can ensure the stable limit of the rectangular steel pipe and realize the rapid material collection and discharge before and after the rectangular steel pipe is processed by innovatively designing the position where the rotating ring contacts the rectangular steel pipe, and the practicality and marketability are greatly enhanced. It should be pointed out that the maximum depth of the upper groove along the radial direction of the rotating ring is smaller than the deformation of the upper torsion spring, and the maximum depth of the lower groove along the radial direction of the rotating ring is smaller than the deformation of the lower torsion spring, which can prevent the torsion spring from overload failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a stereogram of the present invention in an embodiment; Figure 2 A three-dimensional diagram of another viewing angle of the present invention in an embodiment; Figure 3 It is a right side view of the present invention in the embodiment; Figure 4 This is a schematic diagram of the structure inside the protective box of the present invention in an embodiment; Figure 5 is another structural schematic diagram of the rotating ring in the embodiment; Figure 6 for Figure 5 Schematic diagram of the three-dimensional structure of the upper and lower card slots.

[0018] In the figure: 1-support platform, 2-installation slot, 3-protection box, 4-electronic control unit, 5-positioning mechanism, 51-support frame, 52-limiting rectangular frame, 53-screw rod 1, 54-slider, 55-installation column, 56-limiting ring, 57-locking nut, 6-bending mechanism, 601-stepping motor, 602-worm, 603-rotating shaft, 604-worm gear 1, 605-worm gear 2, 606-L-shaped driving arm, 607-support, 608-connecting rod, 609-clamping arm 1, 610-sleeve, 611-sliding column, 612-clamping arm 2, 613-spring, 614-limiting column, 615-rotating ring, 616-screw rod 2, 617-ball caster, 7-handwheel 1, 8-handwheel 2, 9-handwheel 3. 6141-upper limit baffle, 6142-lower limit baffle, 6143-upper torsion spring, 6144-upper slot, 6145-lower torsion spring, 6146-lower slot. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] See also Figure 1-4 This embodiment provides a technical solution: a rectangular steel pipe bending device, including a supporting platform 1, a positioning mechanism 5 and a bending mechanism 6.

[0021] The four corners of the support platform 1 are provided with mounting grooves 2, and a protection box 3 is arranged on the front side of the middle part of the upper end surface of the support platform 1. Avoidance holes are symmetrically opened in the middle part of the upper end surface of the protection box 3. It also includes an electric control unit 4, which is arranged in the middle part of the upper end surface of the protection box 3, and the electric control unit 4 is externally connected to a power supply.

[0022] The positioning mechanism 5 includes a support frame 51, a limiting rectangular frame 52, a screw rod 53, a slider 54 and a mounting column 55. The support frame 51 is symmetrically arranged at the middle rear side of the upper end surface of the support platform 1. The upper end surfaces of the two support frames 51 are fixedly connected to the limiting rectangular frame 52. The front and rear walls of the limiting rectangular frame 52 are rotatably connected with a screw rod 53. The middle part of the outer side surface of the screw rod 53 is threadedly connected with a slider 54. The slider 54 is slidably connected to the inner wall of the limiting rectangular frame 52. The middle part of the upper end surface of the slider 54 is provided with a mounting column 55. The upper end of the outer side surface of the mounting column 55 is provided with a thread. The positioning mechanism 5 also includes a limiting ring 56 and a locking screw The nut 57 and the limit ring 56 are rotatably connected to the outer side surface of the mounting column 55, and the locking nut 57 is threadedly connected to the upper end of the outer side surface of the mounting column 55. The staff selects a suitable limit ring 56 for installation according to the bending radius, and then rotates the hand wheel 7. The rotation of the hand wheel 7 drives the screw rod 53 to rotate. The rotation of the screw rod 53 is restricted by the thread, and the slider 54 moves backward, and drives the limit ring 56 to move backward through the mounting column 55. The limit ring 56 stops after contacting the rectangular steel pipe to be bent, and then the staff aligns the bending center with the limit ring 56. After the alignment and positioning are completed, the staff tightens the locking nut 57 to achieve the positioning of the bending center.

[0023] The bending mechanism 6 includes a stepper motor 601, a worm 602, a rotating shaft 603, a worm gear 1 604, a worm gear 2 605 and an L-shaped driving arm 606. The stepper motor 601 is arranged in the middle of the front side surface of the protective box 3. The worm gear 602 is rotatably connected between the front and rear inner walls of the protective box 3 through a bearing. The end face of the output shaft of the stepper motor 601 is fixedly connected to the front end face of the worm gear 602. The rotating shaft 603 is symmetrically arranged on the left and right sides of the upper end face of the supporting platform 1. The worm gear 1 604 is fixedly connected to the middle of the outer side surface of the rotating shaft 603 on the left side. The worm gear 2 605 is fixedly connected to the middle of the outer side surface of the rotating shaft 603 on the right side. The worm gear 1 604 and the worm gear 2 605 are respectively meshed and linked with the worm 602. The worm gear 1 604 and the worm gear 2 The rotation directions of the two 605 are opposite, and the upper end surfaces of the two rotating shafts 603 are fixedly connected with L-shaped driving arms 606. The input end of the stepper motor 601 is electrically connected to the output end of the electronic control unit 4. The bending mechanism 6 also includes a support 607, a connecting rod 608, a clamping arm 1 609, a sleeve 610, a sliding column 611, a clamping arm 2 612, a spring 613 and a screw rod 2 616. The supports 607 are symmetrically arranged on the rear side surfaces of the two L-shaped driving arms 606 at equal distances. The connecting rod 608 is rotatably connected between the two adjacent supports 607 via a pin shaft, and the rear end of each connecting rod 608 is also rotatably connected to the support 607. The supports at the rear ends of the two connecting rods 608 rotatably connected to the same L-shaped driving arm 606 The rear end faces of the clamping arms 1 609 are fixedly connected between them, the rear side faces of the clamping arms 1 609 are symmetrically fixedly connected with sleeves 610, the middle parts of the sleeves 610 are slidably connected with sliding posts 611, the rear end faces of the sliding posts 611 on the same clamping arm 1 609 are fixedly connected with clamping arms 2 612, springs 613 are arranged between the rear end faces of each sleeve 610 and the front and rear adjacent clamping arms 2 612, the springs 613 are fixedly sleeved on the outer side faces of each sliding post 611, the screw rods 2 616 are rotatably connected between the opposite inner side faces of the front and rear adjacent clamping arms 1 609 and the clamping arms 2 612, the bending mechanism 6 also includes a limiting post 614 and a rotating ring 615, the limiting post 614 They are respectively arranged at equal distances on the upper end surfaces of each clamping arm 1 609 and the clamping arm 2 612, and the outer side surfaces of each limiting column 614 are symmetrically rotated up and down and connected with a rotating ring 615. The bending mechanism 6 also includes a ball caster 617, and the ball caster 617 is respectively arranged on the lower end surfaces of each clamping arm 1 609 and the clamping arm 2 612. When the stepper motor 601 is running, the output shaft of the stepper motor 601 rotates to drive the worm 602 to rotate, and the rotation of the worm 602 drives the worm wheel 1 604 and the worm wheel 2 605 to rotate, and the rotation of the worm wheel 1 604 and the worm wheel 2 605 drives the two rotating shafts 603 to rotate in opposite directions, and the two rotating shafts 603 rotate in opposite directions to drive the two L-shaped driving arms 606 to rotate in opposite directions.The two L-shaped driving arms 606 rotate in opposite directions through the support 607 and the connecting rod 608 to drive the clamping arm 1 609 and the clamping arm 2 612 to rotate in opposite directions, thereby realizing synchronous bending of the rectangular steel pipe to be bent. The handwheel 1 7, the handwheel 2 8 and the handwheel 3 9 are also included. The handwheel 1 7 is arranged on the rear end face of the screw rod 1 53, the handwheel 2 8 is arranged on the rear end face of the screw rod 2 616 on the left side, and the handwheel 3 9 is arranged on the rear end face of the screw rod 2 616 on the right side.

[0024] See also Figure 5 and Figure 6 As another preferred solution in this embodiment, the outer periphery of the limit column 614 is fixedly connected to the upper limit baffle 6141 and the lower limit baffle 6142. The two rotating rings 615 on the same limit column 614 are located between the upper limit baffle 6141 and the lower limit baffle 6142. An upper torsion spring 6143 is arranged between the upper rotating ring 615 and the upper limit baffle 6141. The two ends of the upper torsion spring 6143 are respectively plugged into the assembly holes of the upper rotating ring 615 and the upper limit baffle 6141. An upper clamping groove 6144 is arranged from bottom to top on the lower end surface of the upper rotating ring 615. The upper clamping groove 6144 extends in both radial and axial directions of the rotating ring 615. The depth of the upper groove 6144 in the radial direction of the rotating ring 615 gradually increases, and the maximum depth of the upper groove 6144 along the radial direction of the rotating ring 615 is less than the deformation of the upper torsion spring 6143. A lower torsion spring 6145 is arranged between the rotating ring 615 and the lower limit baffle 6142 below. The two ends of the lower torsion spring 6145 are respectively plugged into the assembly holes of the rotating ring 615 and the lower limit baffle 6142 below. A lower groove 6146 is arranged on the upper end surface of the rotating ring 615 below. The lower groove 6146 extends in the radial and axial directions of the rotating ring 615. The depth of the lower groove 6146 in the radial direction of the rotating ring 615 gradually increases, and the maximum depth of the lower groove 6146 in the radial direction of the rotating ring 615 is less than the deformation of the lower torsion spring 6145.

[0025] The working principle of the rectangular steel pipe bending equipment provided by the present invention is as follows: Place the rectangular steel pipe to be bent above the limiting rectangular frame 52, turn handwheel 2 8 and handwheel 3 9, the rotation of handwheel 2 8 and handwheel 3 9 drives screw rod 2 616 to rotate, screw rod 2 616 rotates and, under the restriction of the thread, clamping arm 2 612 approaches clamping arm 1 609, so that the limiting column 614 on the rear side approaches the front side, and then the rectangular steel pipe to be bent is preliminarily clamped by rotating ring 615, and then the staff selects a suitable limiting ring 56 for installation according to the bending radius, and then the staff rotates handwheel 1 7, the rotation of handwheel 1 7 drives screw rod 1 53 to rotate, the rotation of screw rod 1 53 is limited by the thread, the slider 54 moves to the rear side, and drives the limiting ring 56 to move backward through the installation column 55, and the limiting ring 56 stops after contacting the rectangular steel pipe to be bent, and then the staff aligns the bending center with the limiting ring 56, aligns the limiting ring After the positioning is completed, the staff tightens the locking nut 57, and then inputs the bending angle into the electronic control unit 4. The electronic control unit 4 controls the stepper motor 601 to start, and the stepper motor 601 runs. The output shaft of the stepper motor 601 rotates to drive the worm 602 to rotate, and the rotation of the worm 602 drives the worm wheel 1 604 and the worm wheel 2 605 to rotate. The rotation of the worm wheel 1 604 and the worm wheel 2 605 drives the two rotating shafts 603 to rotate in opposite directions. The two rotating shafts 603 rotate in opposite directions to drive the two L-shaped driving arms 606 to rotate in opposite directions. The avoidance hole provides an avoidance space for the L-shaped driving arm 606. The two L-shaped driving arms 606 rotate in opposite directions through the support 607 and the connecting rod 608 to drive the clamping arm 1 609 and the clamping arm 2 612 to rotate in opposite directions, thereby realizing the synchronous bending of the rectangular steel pipe to be bent.

[0026] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A rectangular steel tube bending device, comprising a support platform (1), a positioning mechanism (5) and a bending mechanism (6); characterized in that: A protection box (3) is provided at the front middle part of the upper end surface of the support platform (1), and avoidance holes are symmetrically provided on the upper end surface of the protection box (3); The positioning mechanism (5) comprises a support frame (51), a limiting rectangular frame (52), a screw rod (53), a slider (54) and a mounting column (55), wherein there are two support frames (51), the two support frames (51) are symmetrically arranged at the middle rear side of the upper end surface of the support platform (1), the top ends of the two support frames (51) are fixedly connected to the limiting rectangular frame (52), the front and rear walls of the limiting rectangular frame (52) are rotatably connected with the screw rod (53) via a bearing, the outer side of the screw rod (53) is threadedly connected with the slider (54), the slider (54) is slidably connected to the inner wall of the limiting rectangular frame (52), the upper end surface of the slider (54) is provided with a mounting column (55), and the upper end of the outer side surface of the mounting column (55) is provided with a thread; The bending mechanism (6) comprises a stepping motor (601), a worm (602), a rotating shaft (603), a worm gear 1 (604), a worm gear 2 (605) and an L-shaped driving arm (606); the stepping motor (601) is arranged at the middle of the front side surface of the protection box (3); the worm gear (602) is rotatably connected between the front and rear inner walls of the protection box (3) via a bearing; the output shaft end face of the stepping motor (601) is fixedly connected to the front end face of the worm gear (602); and the rotating shaft (603) is symmetrically arranged on the support platform (1). On the left and right sides of the upper end surface, worm gear 1 (604) is fixedly connected to the middle part of the outer side surface of the rotating shaft (603) on the left side, and worm gear 2 (605) is fixedly connected to the middle part of the outer side surface of the rotating shaft (603) on the right side. The worm gear 1 (604) and the worm gear 2 (605) are respectively meshed and connected with the worm (602). The rotation directions of the worm gear 1 (604) and the worm gear 2 (605) are opposite. The upper end surfaces of the two rotating shafts (603) are fixedly connected with L-shaped driving arms (606), and a clamping assembly is arranged on the rear side of the L-shaped driving arm (606).

2. The rectangular steel tube bending equipment according to claim 1 is characterized in that: The positioning mechanism (5) further comprises a limiting ring (56) and a locking nut (57); the limiting ring (56) is rotatably connected to the outer side surface of the mounting column (55); and the locking nut (57) is threadedly connected to the upper end of the outer side surface of the mounting column (55).

3. The rectangular steel tube bending equipment according to claim 1, characterized in that: The clamping assembly comprises a support (607), a connecting rod (608), a clamping arm 1 (609), a sleeve (610), a sliding column (611), a clamping arm 2 (612), a spring (613) and a screw rod 2 (616). The support (607) is symmetrically arranged on the rear side surfaces of the two L-shaped driving arms (606) at equal distances from each other. The two upper and lower adjacent supports (607) are rotatably connected to the connecting rod (608) via a pin shaft. The rear end of each connecting rod (608) is also rotatably connected to the support (607). The rear end surfaces of the supports (607) at the rear ends of the two connecting rods (608) rotatably connected to the same L-shaped driving arm (606) are fixedly connected. A clamping arm (609) is provided, and the rear side surface of the clamping arm (609) is symmetrically fixedly connected with a sleeve (610), the middle part of the sleeve (610) is slidably connected with a sliding column (611), and the rear end surface of the sliding column (611) located on the same clamping arm (609) is fixedly connected with the clamping arm (612), and a spring (613) is provided between the rear end surface of each sleeve (610) and the front and rear adjacent clamping arm (612), and the spring (613) is fixedly sleeved on the outer side surface of each sliding column (611), and the screw rod (616) is rotatably connected between the relatively inner side surfaces of the front and rear adjacent clamping arm (609) and the clamping arm (612).

4. The rectangular steel tube bending equipment according to claim 3 is characterized in that: The clamping assembly further comprises a limiting column (614) and a rotating ring (615), wherein the limiting columns (614) are respectively arranged at equal distances on the upper end surfaces of the first clamping arm (609) and the second clamping arm (612), and the outer side surface of each limiting column (614) is rotatably connected to two rotating rings (615).

5. The rectangular steel tube bending equipment according to claim 4, characterized in that: The outer circumference of the limit column (614) is fixedly connected to the upper limit baffle (6141) and the lower limit baffle (6142); the two rotating rings (615) on the same limit column (614) are located between the upper limit baffle (6141) and the lower limit baffle (6142); an upper torsion spring (6143) is arranged between the upper rotating ring (615) and the upper limit baffle (6141); the two ends of the upper torsion spring (6143) are respectively plugged into the assembly holes of the upper rotating ring (615) and the upper limit baffle (6141); an upper clamping groove (6144) is arranged on the lower end surface of the upper rotating ring (615) from bottom to top; the upper clamping groove (6144) extends in both radial and axial directions of the rotating ring (615); the depth of the upper clamping groove (6144) in the radial direction of the rotating ring (615) gradually increases. The upper retaining groove (6144) increases in radial direction of the rotating ring (615), the maximum depth of the upper retaining groove (6144) along the radial direction of the rotating ring (615) is less than the deformation of the upper torsion spring (6143), a lower torsion spring (6145) is arranged between the rotating ring (615) and the lower limit baffle (6142) at the bottom, the two ends of the lower torsion spring (6145) are respectively plugged into the assembly holes of the rotating ring (615) and the lower limit baffle (6142) at the bottom, a lower retaining groove (6146) is arranged on the upper end surface of the rotating ring (615) at the bottom, the lower retaining groove (6146) extends in both radial and axial directions of the rotating ring (615), the depth of the lower retaining groove (6146) in the radial direction of the rotating ring (615) gradually increases, and the maximum depth of the lower retaining groove (6146) in the radial direction of the rotating ring (615) is less than the deformation of the lower torsion spring (6145).

6. The rectangular steel tube bending equipment according to claim 3, characterized in that: The clamping assembly further comprises a ball caster (617), and the ball caster (617) is respectively arranged on the lower end surface of each clamping arm 1 (609) and clamping arm 2 (612).

7. The rectangular steel tube bending equipment according to claim 3, characterized in that: The rear ends of the screw rod 1 (53), the screw rod 2 (616) on the left side and the screw rod 2 (616) on the right side are respectively provided with a hand wheel 1 (7), a hand wheel 2 (8) and a hand wheel 3 (9).

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