CN113680866B

CN113680866B - Section bending machine with high torque transmission reliability

Info

Publication number: CN113680866B
Application number: CN202111248112.5A
Authority: CN
Inventors: 徐芳
Original assignee: Jiangsu Zehai Machinery Technology Co ltd
Current assignee: Jiangsu Zehai Machinery Technology Co ltd
Priority date: 2021-10-26
Filing date: 2021-10-26
Publication date: 2022-01-04
Anticipated expiration: 2041-10-26
Also published as: CN113680866A

Abstract

The invention relates to the technical field of intelligent manufacturing, and discloses a section bending machine with high torque transmission reliability. According to the pipe body bending machine, the driving gear is driven to rotate through the rotation of the motor, so that the driving grinding wheel and the driven grinding wheel are driven to rotate in the same direction, the pipe body to be bent is conveyed, meanwhile, after punching plasticity is completed, the pipe body is knocked through contact collision of the side wall of the pipe body and a knocking block of the side wall of the connecting column, vibration stress removal of the pipe body is realized through kinetic energy generated in the knocking process, the pipe body warping caused by internal stress due to deformation in the metal bending process is effectively reduced, and the effect of reducing the defective rate is achieved.

Description

Section bending machine with high torque transmission reliability

Technical Field

The invention relates to the technical field of intelligent manufacturing, in particular to a section bending machine with reliable large-torque transmission.

Background

The metal to be processed is bent and rolled in the metal processing process, the metal to be processed is punched and deformed under the action of pressure between the die and the extrusion piece to products in various shapes, wherein the section bender is equipment which is very common in the field of metal rolling, the bending deformation shaping of raw materials is realized under the action of pressure between stamping wheels, the processing efficiency is high, the product appearance is exquisite, and the metal to be processed is praised by the industry.

The prior profile bender has the following technical defects when in use: firstly, when the pipe body is stamped and plasticized by the stamping wheel and the fixed wheel, the pressure between the stamping wheel and the fixed wheel is increased along with the reduction of the distance between the two wheels, so that the torque is increased gradually, the torque transmission capacity between the stamping wheel and the fixed wheel is weakened, the pipe body to be processed cannot be plasticized to a corresponding curvature, and continuous pressurization may cause the extrusion part to break; secondly, after the plasticity of the pipe body is finished, the internal stress of metal can not be eliminated in time due to the deformation of the pipe body in the stamping and bending process, the pipe body is warped, defective products are easy to generate, and the processing efficiency is seriously influenced.

Disclosure of Invention

Aiming at the defects of the existing section bender in the background technology in the using process, the invention provides the section bender with reliable large torque transmission, which has the advantages of stable large torque transmission and timely elimination of the internal stress of a pipe body, and solves the technical problems in the background technology.

The invention provides the following technical scheme: a section bending machine with high torque transmission reliability comprises a base, wherein a connecting column is fixedly connected to the top end of the base, a top plate is fixedly connected to the other end of the connecting column, a supporting table is fixedly connected to the top of the base, a limiting groove is formed in the top wall of the supporting table, a first electromagnet is fixedly connected to the bottom wall of the limiting groove, a second spring is fixedly connected to the other end of the first electromagnet, a first permanent magnet is fixedly connected to the other end of the second spring, a punching wheel is fixedly connected to the top wall of the first permanent magnet, a driving grinding wheel is slidably connected to the right side of the punching wheel and located on the surface of the supporting table, a driven grinding wheel is symmetrically arranged on the left side of the driving grinding wheel and located along the limiting groove, a driving gear is fixedly connected to the back of the driving grinding wheel and located on the back side of the supporting table, and a transmission chain is sleeved on the outer side of the driving gear, the back of driven emery wheel just is located a supporting bench's dorsal part fixedly connected with driven gear, driven gear cup joints the other end at the driving chain, two support columns of a supporting bench's back fixedly connected with, the other end fixed connection of support column is on the inner wall of base, fixedly connected with motor on the inner wall of base, spacing rail has been seted up to the inside wall of base, the other end fixedly connected with output shaft of motor, the other end fixed connection of output shaft is on the driving gear, first gear has been cup jointed in the outside of output shaft, the right side of first gear is equipped with the secondary bending mechanism, the outside of output shaft is equipped with electromagnetic drive mechanism, the inboard of spliced pole is equipped with destressing mechanism.

Preferably, the secondary bending mechanism comprises a second gear engaged with the right side of the first gear, an auxiliary wheel is fixedly connected to one side of the second gear and located on the outer side of the support table, and a torque transmission mechanism is arranged on the inner side of the second gear.

Preferably, the torque transmission mechanism comprises a third electromagnet fixedly connected to a second gear rotating shaft, sliding rails are arranged on the inner side wall of the second gear at equal intervals along the circumferential direction of the second gear, a third permanent magnet is connected to the inner side of the sliding rails in a sliding mode, and the magnetism of the third permanent magnet is different from that of the third electromagnet.

Preferably, the electromagnetic transmission mechanism comprises a telescopic cylinder fixedly connected to the outer side wall of the output shaft, the inside of the telescopic cylinder is fixedly connected with a second electromagnet close to one side of the output shaft, the inside of the telescopic cylinder is slidably connected with a second permanent magnet, the magnetism of the second permanent magnet is different from that of the second electromagnet, and a limiting hole is formed in the inner side wall of the first gear.

Preferably, destressing mechanism is including seting up the opening at the spliced pole lateral wall, the inside sliding connection of opening has the stopper, and is adjacent the first spring of fixedly connected with between the stopper, the lateral wall fixedly connected with of stopper strikes the piece, the equidistant setting of circumference along the spliced pole of the inside of opening of edge of stopper.

Preferably, the number value of the limiting hole is consistent with that of the telescopic cylinder, the diameter value of the limiting hole is larger than that of the second permanent magnet, and the telescopic cylinder and the limiting hole are arranged at equal intervals along the circumferential direction of the output shaft.

Preferably, the number of teeth of the first gear is one third of the number of teeth of the second gear.

The invention has the following beneficial effects:

1. according to the invention, the driving gear is driven to rotate through the rotation of the motor so as to drive the transmission chain and the driven gear to synchronously rotate, so that the driving grinding wheel and the driven grinding wheel rotate in the same direction, the pipe body to be bent is conveyed, meanwhile, the bending plasticity of the pipe body is realized through the matching arrangement among the first electromagnet, the second spring and the first permanent magnet, the effect of adjusting the bending curvature of the section bar through the current magnitude of the first electromagnet is realized, the bending precision is high, and the plasticity is stable.

2. According to the invention, the pipe body is driven to convey by the rotation of the driving grinding wheel and the driven grinding wheel, after the punching plasticity is finished, the pipe body is knocked through the contact collision of the side wall of the pipe body and the knocking block on the side wall of the connecting column, the vibration stress removal of the pipe body is realized through the kinetic energy generated in the knocking process, the pipe body warping caused by the internal stress of the deformation in the metal bending process is effectively reduced, and the effect of reducing the defective rate is achieved.

3. The second permanent magnet slides under the action of magnetic repulsion by electrifying the third electromagnet, so that the second permanent magnet slides to the inside of the limiting hole, the first gear and the output shaft synchronously rotate, the second gear is driven to rotate, the auxiliary wheel is driven to rotate, the effect of secondary bending is achieved, and the adjustment and realization of the bending degree of the pipe body to be bent can be realized; the processing appearance diversity of the pipe body is avoided, secondary processing is avoided, and the processing efficiency is obviously improved.

4. According to the invention, the rotation of the first gear drives the rotation of the second gear to realize secondary bending processing of the pipe body, and meanwhile, the enhancement of the internal supporting force of the second gear in the secondary bending plasticity process is realized through the matching arrangement of the third electromagnet, the third permanent magnet and the slide rail, so that the effect of stable torque transmission is realized, and the problem that the torque cannot be transmitted due to overlarge pressure in the stamping deformation process in the prior art is solved.

Drawings

FIG. 1 is a schematic perspective view of the present invention;

FIG. 2 is a schematic view of the internal perspective structure of the present invention;

FIG. 3 is a schematic view of a back structure of a support table according to the present invention;

FIG. 4 is a perspective view of the knocking mechanism according to the present invention;

FIG. 5 is a schematic view of the connection relationship between the motor and the support pillar according to the present invention;

FIG. 6 is a cross-sectional view of the base of the present invention;

FIG. 7 is an enlarged view of the structure at A in FIG. 6 according to the present invention;

FIG. 8 is a schematic view of an electromagnetic driving mechanism according to the present invention;

FIG. 9 is a schematic view of the internal structure of the first gear of the present invention;

fig. 10 is a schematic structural view of the position relationship between the auxiliary wheel and the limit rail 15 according to the present invention.

In the figure: 1. a base; 101. a support table; 2. connecting columns; 21. a port; 22. a limiting block; 23. knocking the block; 24. a first spring; 3. a top plate; 4. a driving grinding wheel; 41. a driven grinding wheel; 5. punching a wheel; 51. a first permanent magnet; 6. a limiting groove; 7. a first electromagnet; 8. a second spring; 9. a driving gear; 10. a drive chain; 11. a driven gear; 12. a first gear; 121. a limiting hole; 13. a motor; 131. an output shaft; 132. a telescopic cylinder; 133. a second permanent magnet; 134. a second electromagnet; 14. a second gear; 141. a third electromagnet; 142. a slide rail; 143. a third permanent magnet; 15. a limit rail; 16. a support pillar; 17. an auxiliary wheel.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-9, a section bender with reliable large torque transmission comprises a base 1, a connecting column 2 is fixedly connected to the top end of the base 1, a top plate 3 is fixedly connected to the other end of the connecting column 2, a supporting table 101 is fixedly connected to the top end of the base 1, a limiting groove 6 is formed in the top wall of the supporting table 101, a first electromagnet 7 is fixedly connected to the bottom wall of the limiting groove 6, a second spring 8 is fixedly connected to the other end of the first electromagnet 7, a first permanent magnet 51 is fixedly connected to the other end of the second spring 8, a stamping wheel 5 is fixedly connected to the top wall of the first permanent magnet 51, a driving grinding wheel 4 is slidably connected to the right side of the stamping wheel 5 and located on the surface of the supporting table 101, driven grinding wheels 41 are symmetrically arranged on the left side of the driving grinding wheel 4 and along the limiting groove 6, a driving gear 9 is fixedly connected to the back side of the driving grinding wheel 4 and located on the back side of the supporting table 101, the driving gear 9's the outside has cup jointed driving chain 10, and driven grinding wheel 41's back just is located the dorsal part fixedly connected with driven gear 11 of brace table 101, and driven gear 11 cup joints the other end at driving chain 10, two support columns 16 of brace table 101's back fixedly connected with, and fixedly connected with motor 13 on the inner wall of base 1, spacing rail 15 has been seted up to base 1's inside wall, and motor 13's other end fixedly connected with output shaft 131, output shaft 131's other end fixed connection are on driving gear 9, and first gear 12 has been cup jointed in the output shaft 131's the outside, and the right side of first gear 12 is equipped with the secondary bending mechanism, and the outside of output shaft 131 is equipped with electromagnetic drive mechanism, and the inboard of spliced pole 2 is equipped with destressing mechanism. Rotation through first gear 12 drives rotation of second gear 14 and realizes the secondary bending processing to the body, sets up the reinforcing that realizes the internal support power of second gear 14 when the secondary bending plasticity in-process through the cooperation between third electro-magnet 141, third permanent magnet 143, the slide rail 142 simultaneously, and then realizes the effect of the stable transmission of moment of torsion, has solved the problem that prior art can't transmit because of the too big moment of torsion that leads to of punching press deformation in-process pressure.

The secondary bending mechanism comprises a second gear 14 engaged with the right side of the first gear 12, an auxiliary wheel 17 is fixedly connected with one side of the second gear 14 and positioned at the outer side of the support platform 101, and a torque transmission mechanism is arranged at the inner side of the second gear 14. When the secondary bending needs to be performed, the second electromagnet 134 on the side wall of the output shaft 131 is controlled, under the action of the magnetic repulsion force between the second electromagnet 134 and the second permanent magnet 133, the second permanent magnet 133 is driven to move towards the outer side along the telescopic cylinder 132 until the second permanent magnet is attached to the inside of the limit hole 121 matched with the inner side of the first gear 12, at this time, the rotation of the output shaft 131 drives the first gear 12 to synchronously rotate, so that the rotation of the auxiliary wheel 17 is further realized, the secondary bending of the pipe body is realized through the movement of the auxiliary wheel 17, at this time, the curvature of the secondary bending is set as follows, the energization duration of the second electromagnet 134 is controlled, namely, the angle of the first gear 12 driving the second gear 14 to rotate is indicated, if the curvature of the secondary bending with a larger angle is realized, the energization duration of the second electromagnet 134 is longer, and when the curvature of the secondary bending needs to be smaller, the energization duration of the second electromagnet 134 is shorter, the curvature of the pipe body to be bent is adjusted in such a way that the second permanent magnet 133 slides under the action of magnetic repulsion force when the second electromagnet 134 is electrified, so that the second permanent magnet 133 slides to the inside of the limiting hole 121, the first gear 12 and the output shaft 131 synchronously rotate, the second gear 14 is driven to rotate, the auxiliary wheel 17 is driven to rotate, the effect of secondary bending is achieved, and the curvature adjustment of the pipe body to be bent can be realized; the processing appearance diversity of the pipe body is avoided, secondary processing is avoided, and the processing efficiency is obviously improved.

The torque transmission mechanism comprises a third electromagnet 141 fixedly connected to a rotating shaft of the second gear 14, slide rails 142 are arranged on the inner side wall of the second gear 14 at equal intervals along the circumferential direction of the second gear 14, a third permanent magnet 143 is connected to the inner side of the slide rails 142 in a sliding manner, and the magnetism of the third permanent magnet 143 is different from that of the third electromagnet 141. In the process of primary bending plasticity of the pipe body, the second electromagnet 134 is not electrified, at this time, the first gear 12 and the output shaft 131 slide relatively, at this time, the first gear 12 and the second gear 14 are meshed with each other but do not rotate with each other, and the corresponding auxiliary wheel 17 does not rotate, because the meshing transmission of the first gear 12 and the second gear 14 is that a pinion drives a bull gear, therefore, the transmission of the gears is a laborious lever, the extrusion force between teeth is large, at this time, the transmission has large torque, when the secondary bending mechanism is opened, the torque-stabilizing conveying mechanism is synchronously opened, the third electromagnet 141 is opened, and under the action of the magnetic repulsion force between the third electromagnet 141 and the third permanent magnet 143, the third permanent magnet 143 moves towards the outer side of the second gear 14 along the slide rail 142 to further increase the extrusion force between the side wall of the second gear 14 and the side wall of the first gear 12, and then realize the stable transmission of torque, showing and having reduced the extrusion force between the hard bar gear, improved the life of gear, guarantee that big moment of torsion can stable transmission.

The electromagnetic transmission mechanism comprises a telescopic cylinder 132 fixedly connected to the outer side wall of the output shaft 131, a second electromagnet 134 is fixedly connected to one side, close to the output shaft 131, of the inside of the telescopic cylinder 132, a second permanent magnet 133 is connected to the inside of the telescopic cylinder 132 in a sliding mode, the magnetism of the second permanent magnet 133 is different from that of the second electromagnet 134, and a limiting hole 121 is formed in the inner side wall of the first gear 12. When the secondary bending needs to be performed, the second electromagnet 134 on the side wall of the output shaft 131 is controlled, and under the action of the magnetic repulsion force of the second electromagnet 134 and the second permanent magnet 133, the second permanent magnet 133 is driven to move towards the outer side along the telescopic cylinder 132 until the second permanent magnet is attached to the inside of the limiting hole 121 matched with the inner side of the first gear 12, the rotation of the output shaft 131 drives the first gear 12 to rotate synchronously, so that the rotation of the auxiliary wheel 17 is realized, and the secondary bending of the pipe body is realized through the movement of the auxiliary wheel 17.

Destressing mechanism is including seting up opening 21 at 2 lateral walls of spliced pole, and the inside sliding connection of opening 21 has stopper 22, the first spring 24 of fixedly connected with between the adjacent stopper 22, and stopper 22's lateral wall fixedly connected with strikes piece 23, stopper 22 along the equidistant setting of circumference of spliced pole 2 of the inside of opening 21. At the in-process of carrying the ejection of compact, the lateral wall of body and the piece 23 contact of strikeing of spliced pole 2 lateral wall, and then drive stopper 22 motion, extrude first spring 24 for a plurality of pieces 23 of strikeing that set up along spliced pole 2 lateral wall collide with the body in proper order, strike with the body through strikeing piece 23 and realize vibrating destressing, effectively eliminate the metal internal stress of buckling the in-process, reduce the warpage, reduce the defective rate.

The number value of the limiting hole 121 is consistent with that of the telescopic cylinder 132, the diameter value of the limiting hole 121 is larger than that of the second permanent magnet 133, and the telescopic cylinder 132 and the limiting hole 121 are arranged at equal intervals along the circumferential direction of the output shaft 131. The second permanent magnet 133 is ensured to be slidable into the inside of the stopper hole 121.

The number of teeth of the first gear 12 is one third of the number of teeth of the second gear 14. The meshing transmission of the first gear 12 and the second gear 14 at the moment is that a pinion drives a bull gear, so that the transmission of the gears is a laborious lever, the extrusion force between teeth is large, the transmission has large torque, and the stable transmission of the torque is ensured through a torque transmission mechanism.

The use method (working principle) of the invention is as follows:

when the work starts, at first, the pipe body to be processed is placed between the side wall above the left driven grinding wheel 41 and the side wall below the punching wheel 5, the first electromagnet 7 is started, the first permanent magnet 51 is adsorbed under the magnetic adsorption effect of the first electromagnet 7, the second spring 8 is compressed to enable the punching wheel 5 to move downwards along the inside of the limiting groove 6, and further the effect of adjusting the bending rate of the pipe body by changing the distance D between the punching wheel 5 and the driven grinding wheel 41 is achieved.

In the process of primary bending plasticity of the pipe body, the second electromagnet 134 is not electrified, at the moment, the first gear 12 and the output shaft 131 slide relatively, at the moment, the first gear 12 and the second gear 14 are meshed with each other but do not rotate mutually, and the corresponding auxiliary wheel 17 does not rotate.

Then, the motor 13 is started to drive the output shaft 131 to rotate, the rotation of the output shaft 131 drives the driving gear 9 to rotate, the driving gear 11 is driven to rotate in the same direction through meshing transmission of the transmission chain 10, delivery of the pipe body is achieved, after pipe body stamping of corresponding curvature is completed, the pipe body is conveyed out of the device through the right connecting column 2, in the process of conveying and discharging, the side wall of the pipe body is in contact with the knocking block 23 on the side wall of the connecting column 2, the limiting block 22 is driven to move, the first spring 24 is extruded, a plurality of knocking blocks 23 arranged along the side wall of the connecting column 2 are sequentially collided with the pipe body, vibration stress removal is achieved through knocking of the knocking block 23 and the pipe body, internal stress in the metal bending process is effectively eliminated, warping is reduced, and the defective rate is reduced.

When secondary bending is needed, the second electromagnet 134 on the side wall of the output shaft 131 is controlled, under the action of the magnetic repulsion force between the second electromagnet 134 and the second permanent magnet 133, the second permanent magnet 133 is driven to move towards the outer side along the telescopic cylinder 132 until the second permanent magnet is attached to the inside of the matched limiting hole 121 on the inner side of the first gear 12, at this time, the rotation of the output shaft 131 drives the first gear 12 to synchronously rotate, so that the rotation of the auxiliary wheel 17 is realized, secondary bending of the pipe body is realized through the movement of the auxiliary wheel 17, at this time, the curvature of the secondary bending is set as follows, the energization duration of the second electromagnet 134 is controlled, namely, the angle of the first gear 12 driving the second gear 14 to rotate is indicated, if the curvature of the secondary bending with a larger angle is realized, the energization duration of the second electromagnet 134 is longer, and if the curvature of the secondary bending with a smaller curvature is needed, the energization duration of the second electromagnet 134 is shorter, so realize the regulation to the camber of secondary bend, show the bending plasticity efficiency that has improved the body, can obtain more diversified product.

In the process of secondary bending plasticity, because the meshing transmission of the first gear 12 and the second gear 14 at the moment is that the large gear is driven by the small gear, the transmission of the gears is a labor-consuming bar, the extrusion force between the teeth is large, and at the moment, the transmission has large torque, when the secondary bending mechanism is started, the torque stabilizing and conveying mechanism is synchronously started, the third electromagnet 141 is started, and under the action of the magnetic repulsion force between the third electromagnet 141 and the third permanent magnet 143, the third permanent magnet 143 moves towards the outer side of the second gear 14 along the sliding rail 142, so that the extrusion force between the side wall of the second gear 14 and the side wall of the first gear 12 is increased, the stable transmission of the torque is further realized, the extrusion force between the labor-consuming bar gears is remarkably reduced, the service life of the gears is prolonged, and the stable transmission of the large torque is ensured.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A section bending machine with high torque transmission reliability comprises a base (1) and is characterized in that: the top fixedly connected with spliced pole (2) of base (1), the other end fixedly connected with roof (3) of spliced pole (2), the top fixedly connected with brace table (101) of base (1), spacing groove (6) have been seted up to the roof of brace table (101), the end jade fixedly connected with first electro-magnet (7) of spacing groove (6), the other end fixedly connected with second spring (8) of first electro-magnet (7), the other end fixedly connected with first permanent magnet (51) of second spring (8), the roof fixedly connected with punching press wheel (5) of first permanent magnet (51), the surface sliding connection that just is located brace table (101) on the right side of punching press wheel (5) has initiative emery wheel (4), the left side of initiative emery wheel (4) just is equipped with driven emery wheel (41) along spacing groove (6) symmetry, the back of the driving grinding wheel (4) is fixedly connected with a driving gear (9) on the back side of the supporting table (101), the outer side of the driving gear (9) is sleeved with a transmission chain (10), the back of the driven grinding wheel (41) is fixedly connected with a driven gear (11) on the back side of the supporting table (101), the driven gear (11) is sleeved at the other end of the transmission chain (10), the back of the supporting table (101) is fixedly connected with two supporting columns (16), the other ends of the supporting columns (16) are fixedly connected on the inner wall of the base (1), a motor (13) is fixedly connected on the inner wall of the base (1), a limiting rail (15) is arranged on the inner side wall of the base (1), an output shaft (131) is fixedly connected at the other end of the motor (13), and the other end of the output shaft (131) is fixedly connected on the driving gear (9), the outer side of the output shaft (131) is sleeved with a first gear (12), the right side of the first gear (12) is provided with a secondary bending mechanism, the secondary bending mechanism comprises a second gear (14) meshed with the right side of the first gear (12), one side of the second gear (14) is fixedly connected with an auxiliary wheel (17) and positioned on the outer side of the supporting table (101), the inner side of the second gear (14) is provided with a torque transmission mechanism, the torque transmission mechanism comprises a third electromagnet (141) fixedly connected to a rotating shaft of the second gear (14), the inner side wall of the second gear (14) is provided with sliding rails (142) at equal intervals along the circumferential direction of the second gear (14), the inner side of the sliding rails (142) is slidably connected with a third permanent magnet (143), the magnetism of the third permanent magnet (143) is different from that of the third electromagnet (141), the outer side of the output shaft (131) is provided with an electromagnetic transmission mechanism, the electromagnetic transmission mechanism comprises a telescopic cylinder (132) fixedly connected to the outer side wall of the output shaft (131), a second electromagnet (134) is fixedly connected to the inner side of the telescopic cylinder (132) and the side close to the output shaft (131), a second permanent magnet (133) is connected to the inner side of the telescopic cylinder (132) in a sliding mode, the magnetism of the second permanent magnet (133) is different from that of the second electromagnet (134), a limiting hole (121) is formed in the inner side wall of the first gear (12), when secondary bending is required, the second electromagnet (134) on the side wall of the output shaft (131) is controlled, under the magnetic repulsion effect of the second electromagnet (134) and the second permanent magnet (133), the second permanent magnet (133) is driven to move towards the outer side along the inner side of the telescopic cylinder (132) until the second permanent magnet is attached to the inner side of the limiting hole (121) matched with the inner side of the first gear (12), and the rotation of the first gear (12) is driven by the rotation of the output shaft (131) at the moment, and then realize the rotation of auxiliary wheel (17), realize the secondary bending to the section bar through the removal of auxiliary wheel (17), the camber setting of secondary bending is as follows this moment, control second electro-magnet (134) circular telegram duration, show that first gear (12) drives the angle that second gear (14) took place to rotate promptly, if realize the secondary bending camber of great angle, correspond the circular telegram duration of longer second electro-magnet (134), when needing less secondary bending camber, correspond the circular telegram duration of shorter second electro-magnet (134), the inboard of spliced pole (2) is equipped with destressing mechanism.

2. A profile bending machine with high torque transmission reliability as claimed in claim 1, wherein: destressing mechanism is including seting up opening (21) at spliced pole (2) lateral wall, the inside sliding connection of opening (21) has stopper (22), and is adjacent the first spring of fixedly connected with (24) between stopper (22), the lateral wall fixedly connected with of stopper (22) strikes piece (23), the equidistant setting of circumference along spliced pole (2) of the inside of opening (21) of edge of stopper (22).

3. A profile bending machine with high torque transmission reliability as claimed in claim 1, wherein: the number value of spacing hole (121) keeps unanimous with the number value of telescopic cylinder (132), the diameter value of spacing hole (121) is greater than the diameter value of second permanent magnet (133), telescopic cylinder (132) all set up with equidistant along the circumference of output shaft (131) with spacing hole (121).

4. A profile bending machine with high torque transmission reliability as claimed in claim 1, wherein: the number of teeth of the first gear (12) is one third of the number of teeth of the second gear (14).