CN215845047U - Large pipe bender - Google Patents

Abstract

The utility model relates to the technical field of bent pipe production, in particular to a large pipe bender which can reduce the floor area and increase the diameter of a bent pipeline, save the production cost and improve the practicability; including feeding mechanism, heating cooling body and positioning mechanism, heating cooling body sets up between feeding mechanism and positioning mechanism, the last locating rack that is provided with of positioning mechanism to positioning mechanism can follow the locating rack and rotate, the positioning mechanism bottom is provided with retrieves the mechanism, locating rack and feeding mechanism fixed connection, feeding mechanism includes guiding mechanism, actuating mechanism and stop gear, actuating mechanism sets up on guiding mechanism, stop gear installs in guiding mechanism one end.

Description

Large pipe bender

Technical Field

The utility model relates to the technical field of bent pipe production, in particular to a large pipe bender.

Background

As is well known, in return bend production process, most return bends all are formed by straight tube bending, during current return bend shaping, adopt return bend pushing machine to carry out the hot bending shaping mostly, but pushing machine generally is applicable to less or the shorter complete bending of length, when large-scale return bend production, return bend pushing machine then can't satisfy the demand, consequently, need adopt large-scale bending machine to carry out the return bend bending, current large-scale bending machine is when using, its area is great, under the equipment of the same specification, the diameter to the pipeline that needs carry out the bending is limited, when the pipeline of needs crooked major diameter, need bigger equipment to bend, not only area increase, simultaneously still great increase manufacturing cost, thereby lead to its practicality relatively poor.

SUMMERY OF THE UTILITY MODEL

Technical problem to be solved

Aiming at the defects of the prior art, the utility model provides the large pipe bender which can reduce the floor area, increase the diameter of a bent pipeline, save the production cost and improve the practicability.

(II) technical scheme

In order to achieve the purpose, the utility model provides the following technical scheme: the utility model provides a large-scale bending machine, includes feeding mechanism, heating cooling body and positioning mechanism, heating cooling body sets up between feeding mechanism and positioning mechanism, the last locating rack that is provided with of positioning mechanism to positioning mechanism can follow the locating rack and rotate, the positioning mechanism bottom is provided with retrieves the mechanism, locating rack and feeding mechanism fixed connection, feeding mechanism includes guiding mechanism, actuating mechanism and stop gear, actuating mechanism sets up on guiding mechanism, stop gear installs in guiding mechanism one end.

Specifically, guiding mechanism includes two sets of chassis, multiunit connecting seat, two sets of support side's pipe and multiunit chevron shape support frame, multiunit connecting seat both ends are connected with two sets of chassis respectively, multiunit chevron shape support frame top is connected with two sets of support side's pipe respectively to multiunit chevron shape support frame bottom is connected with the multiunit connecting seat respectively, two sets of chassis one end is provided with the link, the link is connected with stop gear.

Specifically, the driving mechanism comprises a first motor, a first speed reducer, a coupler, a transmission shaft, a plurality of transmission gears, a plurality of transmission chains, a plurality of fixed clamping seats, a plurality of supporting frames, a plurality of fixed plates, a plurality of guide shafts, a plurality of guide gears, two groups of supporting seats, two groups of moving seats and a pushing seat, wherein the guiding mechanism is provided with a mounting seat, the first motor is arranged at the input end of the first speed reducer, the coupler is arranged at the input end of the first speed reducer, the first speed reducer is arranged on the mounting seat, the plurality of fixed clamping seats are respectively arranged on the guiding mechanism and the limiting mechanism, the transmission shaft penetrates through the plurality of fixed clamping seats and is rotatably connected with the plurality of fixed clamping seats, the transmission shaft is connected with the coupler, the plurality of transmission gears are respectively sleeved and fixed at two ends of the transmission shaft, the other end of the guiding mechanism is provided with four groups of positioning plates, the multiunit support frame is all installed on guiding mechanism to multiunit support frame top is connected with the multiunit fixed plate respectively, the multiunit fixed plate is connected with two sets of support side pipe both ends respectively, the multiunit guiding axle is rotatable installation respectively between multiunit fixed plate and four group's locating plates, multiunit guiding gear is fixed to the multiunit guiding axle on the suit respectively, multiunit guiding gear and multiunit drive gear are connected through multiunit drive chain transmission respectively, two sets of supporting seats are installed on guiding mechanism, multiunit drive chain places respectively on two sets of supporting seats, two sets of removal seats are portable the setting respectively on two sets of support side pipes to two sets of removal seats are connected with multiunit drive chain respectively, it is connected with two sets of removal seats to push away the seat and be provided with two sets of first mechanisms that clamp.

Specifically, first mechanism of clamping includes two sets of first arc card dress framves and multiunit second arc card dress frame, the equal fixed mounting of two sets of first arc card dress framves is on the propelling movement seat to clamp the frame both ends at two sets of first arcs and be provided with the first card of multiunit respectively, multiunit second arc card dress frame both ends are provided with the multiunit second card respectively, two sets of first arc card dress framves and multiunit second arc card dress frame volume reduce gradually, and two sets of first arc card dress framves and multiunit second arc card dress frame are connected through the cooperation of multiunit first card and multiunit second card and multiunit fixing bolt.

Specifically, the limiting mechanism comprises a limiting seat, a second motor, a second speed reducer, a driving shaft, a protective frame, two groups of driving gears, two groups of driven gears, two groups of tensioning gears, two groups of lead screws, two groups of movable pipes, two groups of limiting frames and a plurality of groups of limiting rollers, wherein the limiting seat is arranged at one end of the guide mechanism, the limiting seat and the guide mechanism are fixed in an auxiliary manner through two groups of fixed pipes, a through hole is formed in the limiting seat, two groups of movable grooves are formed in the inner wall of the through hole of the limiting seat, the two groups of limiting frames are respectively and movably arranged in the two groups of movable grooves, the protective frame is arranged at one side of the limiting frame, the second motor is arranged at the input end of the second speed reducer, the second speed reducer is arranged on the protective frame, one end of the driving shaft penetrates through the protective frame and is connected with the output end of the second speed reducer, and the other end of the driving shaft penetrates through the limiting seat and is rotatably connected with the limiting seat, two sets of drive gears all install in the drive shaft, two sets of driven gear install respectively on two sets of lead screws, two sets of lead screws all pass spacing seat and stretch into to two sets of shifting chutes to two sets of lead screws and spacing seat contact department rotatable coupling, two sets of removal pipes spiral shell dress respectively to two sets of lead screws on to two sets of removal pipes are connected with two sets of spacing framves respectively, the spacing roller of multiunit is rotatable installation respectively in two sets of spacing framves, two sets of drive gears and two sets of driven gear are connected through two sets of drive chain drive, two sets of tensioning gears are respectively through two sets of location axle rotatable installations in spacing seat both sides to two sets of tensioning gears respectively with two sets of drive chain meshing.

The pipe support structure comprises a positioning seat, a first hydraulic cylinder, a lifting rod, a lifting frame, a supporting roller, a fixed shaft and two sets of limiting shafts, wherein the positioning seat is installed on the guide mechanism, the first hydraulic cylinder is installed on the positioning seat, two ends of the lifting rod are respectively connected with the lifting frame and the output end of the first hydraulic cylinder, two sets of limiting holes are formed in the positioning seat, the two sets of limiting shafts are installed at the bottom of the lifting frame, the two sets of limiting shafts are respectively inserted into the two sets of limiting holes, the supporting roller is sleeved and fixed on the fixed shaft, and the fixed shaft is rotatably connected with the lifting frame.

Specifically, heating and cooling mechanism includes mounting bracket, two sets of dead levers, two sets of locating clips, heating coil, annular cooling tube, multiunit shower nozzle and liquid sending pipe, the mounting bracket is installed in guiding mechanism endpoint department to the mounting bracket is located the stop gear left side, two sets of dead levers both ends are connected with mounting bracket and two sets of locating clips respectively, heating coil is fixed through two sets of locating clips, the annular cooling tube is installed on two sets of locating clips outer wall, the multiunit shower nozzle all communicates with the annular cooling tube, liquid sending pipe and annular cooling tube intercommunication.

Specifically, the positioning mechanism comprises a rotating arm, a rotating seat, a fixed seat, an adjusting seat, a second hydraulic cylinder, a first adjusting shaft, a first limiting rack, a second limiting rack, a base, a first arc-shaped clamping seat, a second arc-shaped clamping seat, two sets of third hydraulic cylinders, two sets of second adjusting shafts, a fourth hydraulic cylinder, a third adjusting shaft and a limiting fixture block, wherein a plurality of sets of clamping holes are arranged on the positioning frame, two ends of the first adjusting shaft are respectively connected with the output end of the second hydraulic cylinder and the fixed seat, an insertion block is arranged on the second hydraulic cylinder and inserted into one set of clamping holes, one end of the rotating arm is connected with the first arc-shaped clamping seat, the other end of the rotating arm penetrates through the adjusting seat, the first limiting rack is arranged at the top, a limiting cavity is arranged inside the adjusting seat, the second limiting rack is positioned in the limiting cavity, and the second limiting rack is meshed with the first limiting rack, two groups of second limiting racks are rotatably provided with two groups of adjusting screws, the two groups of adjusting screws are all screwed through the tops of the adjusting seats, two groups of rotating blocks are respectively arranged at the tops of the two groups of adjusting screws, the adjusting seats are fixedly connected with the rotating seats, the rotating seats are rotatably arranged at the tops of the fixing seats, the fixing seats are placed at the tops of the positioning frames, two groups of clamping blocks are respectively arranged at the two ends of the bottom of the fixing seats, the two groups of clamping blocks are fixedly connected with the fixing seats through fixing bolts and nuts, the positioning frames are inserted between the two groups of clamping blocks and the fixing seats, the base is arranged at the bottom of the first arc-shaped clamping seat and is provided with a limiting groove, the second arc-shaped clamping seat is rotatably connected with the upper half area of the first arc-shaped clamping seat, two groups of supporting seats are respectively arranged on the first arc-shaped clamping seat and the second arc-shaped clamping seat, and two groups of rotating shafts are respectively rotatably arranged on the two groups of supporting seats, the two sets of second regulating spindles are respectively installed at the output ends of the two sets of third hydraulic cylinders, the two sets of second regulating spindles and the two sets of third hydraulic cylinders are respectively connected with the two sets of rotating shafts, the fourth hydraulic cylinder is arranged on the outer wall of the second arc-shaped clamping seat, the two ends of the third regulating spindle are respectively connected with the fourth hydraulic cylinder and the limiting clamping block, the hydraulic box is arranged on the first arc-shaped clamping seat, the first arc-shaped seats and the second arc-shaped seats are respectively detachably arranged on the first arc-shaped clamping seat and the second arc-shaped clamping seat, and the volumes of the first arc-shaped seats and the second arc-shaped seats are sequentially reduced.

Specifically, retrieve the mechanism and include hydraulic motor and roller bearing, the locating mechanism is provided with the recovery frame in the area of the second half, the roller bearing is rotatable to be installed in retrieving the frame, hydraulic motor installs on retrieving the frame outer wall to the hydraulic motor output is connected with the roller bearing.

The winding and unwinding mechanism comprises a third motor, a third speed reducer, a scroll and a winding seat, the winding seat is installed at the top of the limiting mechanism, the third motor is installed at the input end of the third speed reducer, the third speed reducer is installed on the winding seat, the scroll is rotatably installed on the winding seat, and the scroll penetrates through the winding seat and is connected with the output end of the third speed reducer.

(III) advantageous effects

Compared with the prior art, the utility model provides a large pipe bender, which has the following beneficial effects: the utility model changes the original round supporting tube into the supporting square tube, changes the transmission chain into the transmission chain which passes up and down the square tube without occupying the space between the supporting tubes, thereby directly increasing the available distance between the supporting tubes, under the same setting condition, the distance between the square tubes is smaller than the distance between the round tubes, thereby increasing the diameter of the bent pipeline while reducing the occupied area, and when the square tube and the herringbone supporting frame are adopted, the supporting capability is improved, thereby the thickness of the square tube and the herringbone supporting frame can be reduced, thereby saving the production cost and improving the practicability, when in use, the tube which needs to be bent is clamped between the limiting mechanism and the driving mechanism, and is moved along the guiding mechanism by the driving mechanism, passes through the heating and cooling mechanism during the movement, and the end point is limited by the positioning mechanism, the pipe is driven to move by the driving mechanism, the pipe is heated by the heating and cooling mechanism when the pipe passes through the heating and cooling mechanism, the positioning mechanism rotates along the central point of the pipe along with the movement of the pipe, so that the pipe can be driven to bend, part of the heated pipe is directly cooled and shaped by the heating and cooling mechanism after being bent, the pipe is taken down after the pipe is bent, and the recovery mechanism is driven to recover the positioning mechanism to return to the initial position.

When the equipment is used for processing the pipe, the torque of the equipment rises, the wall thickness of the pipe which can be processed rises, the force which can be applied is larger, and the equipment can be lightened and the processing range can be enlarged.

Drawings

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

FIG. 2 is an enlarged partial view of portion A of FIG. 1;

FIG. 3 is a rear view of the feeding mechanism;

FIG. 4 is a schematic view of a matching structure of a screw rod, a moving pipe, a limiting frame and a limiting roller;

FIG. 5 is an enlarged partial view of the first clamping mechanism of FIG. 3;

FIG. 6 is a schematic left side view of the present invention;

FIG. 7 is a schematic top view of the present invention;

FIG. 8 is a schematic view of a rear view of a portion of the heating and cooling mechanism;

FIG. 9 is a schematic view of the engagement of the second limit rack, the adjustment screw, and the rotation block;

in the drawings, the reference numbers:

a feeding mechanism:

a guide mechanism: 11. a chassis; 12. a connecting seat; 13. supporting the square pipe; 14. a herringbone support frame; 15. a connecting frame;

a driving mechanism: 21. a first motor; 22. a first speed reducer; 23. a coupling; 24. a drive shaft; 25. a transmission gear; 26. a drive chain; 27. fixing the card holder; 28. a support frame; 29. A fixing plate; 210. a guide shaft; 211. a guide gear; 212. a supporting seat; 213. a movable seat; 214. a pushing seat; 215. a mounting seat; 216. positioning a plate;

first clamping mechanism: 2171. a first arc-shaped clamping frame; 2172. a second arc-shaped clamping frame; 2173. a first card; 2174. a second card;

a limiting mechanism: 31. a limiting seat; 32. a second motor; 33. a second speed reducer; 34. a drive shaft; 35. a protection frame; 36. a drive gear; 37. a driven gear; 38. a tension gear; 39. A lead screw; 310. moving the tube; 311. a limiting frame; 312. a limiting roller; 313. a fixed tube; 314. Driving the chain; 315. positioning the shaft;

heating and cooling mechanism: 41. a mounting frame; 42. fixing the rod; 43. positioning clips; 44. a heating coil; 45. an annular cooling tube; 46. a spray head; 47. a liquid delivery pipe;

5. a positioning frame;

a positioning mechanism: 61. a rotating arm; 62. a rotating base; 63. a fixed seat; 64. an adjusting seat; 65. A second hydraulic cylinder; 66. a first adjustment shaft; 67. a first limit rack; 68. a second limit rack; 69. a base; 610. a first arc-shaped clamping seat; 611. a second arc-shaped clamping seat; 612. a third hydraulic cylinder; 613. a second adjustment shaft; 614. a fourth hydraulic cylinder; 615. a third adjustment shaft; 616. a limiting clamping block; 617. inserting a block; 618. adjusting the screw rod; 619. rotating the block; 620. a clamping block; 621. a support; 622. a rotating shaft; 623. a hydraulic tank; 624. a first arc-shaped seat; 625. A second arc-shaped seat;

the recovery mechanism comprises: 71. a hydraulic motor; 72. a roller; 73. a recycling rack;

a tube support structure: 81. positioning seats; 82. a first hydraulic cylinder; 83. a lifting rod; 84. a lifting frame; 85. a support roller; 86. a fixed shaft; 87. a limiting shaft;

take-up and pay-off mechanism: 91. a third motor; 92. a third speed reducer; 93. a reel; 94. and (4) a winding seat.

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 large pipe bender comprises a feeding mechanism, a heating and cooling mechanism and a positioning mechanism, wherein the heating and cooling mechanism is arranged between the feeding mechanism and the positioning mechanism, the positioning mechanism is provided with a positioning frame 5, the positioning mechanism can rotate along the positioning frame 5, the bottom of the positioning mechanism is provided with a recovery mechanism, the positioning frame 5 is fixedly connected with the feeding mechanism, the feeding mechanism comprises a guiding mechanism, a driving mechanism and a limiting mechanism, the driving mechanism is arranged on the guiding mechanism, and the limiting mechanism is arranged at one end of the guiding mechanism.

In the embodiment, the original round supporting tubes are changed into the supporting square tubes, the transmission chain 26 is changed into the transmission chain which passes up and down the square tubes without occupying the space between the supporting tubes, so that the available distance between the supporting tubes can be directly increased, under the same setting condition, the distance between the square tubes is smaller than the distance between the round tubes, so that the diameter of the bent pipeline can be increased while the occupied area is reduced, and when the square tubes and the herringbone supporting frame 14 are adopted, the supporting capacity is improved, so that the thickness of the square tubes and the herringbone supporting frame 14 can be reduced, the production cost can be saved, the practicability is improved, when in use, the tube to be bent is clamped between the limiting mechanism and the driving mechanism, and is moved along the guide mechanism by the driving mechanism, passes through the heating and cooling mechanism during moving, and the end point of the tube is limited by the positioning mechanism, the pipe is driven to move by the driving mechanism, the pipe is heated by the heating and cooling mechanism when passing through the heating and cooling mechanism, the positioning mechanism rotates along the center point of the pipe along with the movement of the pipe, so that the pipe can be driven to bend, part of the pipe after being heated is directly cooled and shaped by the heating and cooling mechanism after being bent, and after the pipe is bent, the pipe is taken down and the recovery mechanism is driven to recover the positioning mechanism to return to the initial position.

Wherein, guiding mechanism includes two sets of chassis 11, multiunit connecting seat 12, two sets of support side's pipe 13 and multiunit chevron shape support frame 14, and 12 both ends of multiunit connecting seat are connected with two sets of chassis 11 respectively, and 14 tops of multiunit chevron shape support frame are connected with two sets of support side's pipe 13 respectively to 14 bottoms of multiunit chevron shape support frame are connected with multiunit connecting seat 12 respectively, and 11 one end of two sets of chassis are provided with link 15, and link 15 is connected with stop gear.

Can adopt chevron shape support frame 14 to improve the support capacity to supporting square pipe 13 through this embodiment, practice thrift the thickness of square pipe and chevron shape support frame 14, the cost is saved, chevron shape support frame 14 does not influence the normal removal and the fixing of tubular product simultaneously, and drive chain passes through between chevron shape support frame 14, and play certain supporting role to drive chain 26 through supporting square pipe 13, reduce the unsettled cracked condition of drive chain 26, can vacate the position for the fixed of tubular product simultaneously, enlarge the machining diameter to tubular product, very big increase the range of processing of tubular product under the same area.

Wherein, the driving mechanism comprises a first motor 21, a first speed reducer 22, a coupler 23, a transmission shaft 24, a plurality of groups of transmission gears 25, a plurality of groups of transmission chains 26, a plurality of groups of fixed clamping seats 27, a plurality of groups of supporting frames 28, a plurality of groups of fixing plates 29, a plurality of groups of guide shafts 210, a plurality of groups of guide gears 211, two groups of supporting seats 212, two groups of moving seats 213 and a pushing seat 214, the guiding mechanism is provided with a mounting seat 215, the first motor 21 is arranged at the input end of the first speed reducer 22, the coupler 23 is arranged at the input end of the first speed reducer 22, the first speed reducer 22 is arranged on the mounting seat 215, the plurality of groups of fixed clamping seats 27 are respectively arranged on the guiding mechanism and the limiting mechanism, the transmission shaft 24 passes through the plurality of groups of fixed clamping seats 27 and is rotatably connected with the plurality of groups of fixed clamping seats 27, the transmission shaft 24 is connected with the coupler 23, the plurality of groups of transmission gears 25 are respectively sleeved and fixed at two ends of the transmission shaft 24, the other end of the guide mechanism is provided with four groups of positioning plates 216, a plurality of groups of supporting frames 28 are all arranged on the guide mechanism, the tops of a plurality of groups of supporting frames 28 are respectively connected with a plurality of groups of fixing plates 29, the plurality of groups of fixing plates 29 are respectively connected with two ends of two groups of supporting square tubes, a plurality of groups of guide shafts 210 are respectively rotatably arranged between the plurality of groups of fixing plates 29 and four groups of positioning plates 216, a plurality of groups of guide gears 211 are respectively sleeved and fixed on the plurality of groups of guide shafts 210, the plurality of groups of guide gears 211 and a plurality of groups of transmission gears 25 are respectively in transmission connection through a plurality of groups of transmission chains 26, two groups of supporting seats 212 are arranged on a guide mechanism, a plurality of groups of transmission chains 26 are respectively arranged on the two groups of supporting seats 212, two groups of moving seats 213 are respectively movably arranged on the two groups of supporting square tubes, and two sets of moving seats 213 are respectively connected with the sets of transmission chains 26, the pushing seat 214 is connected with the two sets of moving seats, and two sets of first clamping mechanisms are arranged on the pushing seat 214.

The driving mechanism provided by the embodiment can conveniently drive the pipe to move, one end of the pipe is limited on the pushing seat 214 through two groups of first clamping mechanisms on the pushing seat 214, the first motor 21 can be electrified and started, the power output by the first motor 21 is reduced through the first speed reducer 22, the shaft coupler 23 drives the transmission shaft 24 to rotate, the transmission shaft 24 can be rotatably installed in the feeding mechanism through the plurality of groups of fixing clamping seats 27, so that the plurality of groups of transmission gears 25 can be driven to rotate, and then the plurality of groups of transmission chains 26 can be driven to rotate, the transmission positions of the plurality of groups of transmission chains 26 can be conveniently limited through the plurality of groups of guide shafts 210 and the plurality of groups of guide gears 211, meanwhile, the transmission chains 26 can be supported to a certain extent through the supporting square pipes 13 and the two groups of supporting seats 212, and the condition that the transmission chains 26 sink and break under the action of gravity is reduced, along with the motion of drive chain 26, can drive two sets of removal seats 213 and remove along two sets of support side pipes 13 to drive and push seat 214 and tubular product and remove, can conveniently make somebody a mere figurehead first motor 21 and first speed reducer 22 through mounting bracket 41, avoid the damage that cooling water stream warp first motor 21 and first speed reducer 22 caused to it.

Two sets of removal seats that set up in this embodiment can directly slide along two sets of support side pipe tops to reduce the various track spout, slider, wheel etc. and various frame spare that set up before, can effectual reducing wear condition, thereby reduce the fault rate, reduce the maintenance number of times, effectual improvement life.

The first clamping mechanism comprises two groups of first arc-shaped clamping frames 2171 and a plurality of groups of second arc-shaped clamping frames 2172, the two groups of first arc-shaped clamping frames 2171 are fixedly installed on the push seat 214, a plurality of groups of first cards 2173 are respectively arranged at two ends of the two groups of first arc-shaped clamping frames 2171, a plurality of groups of second cards 2174 are respectively arranged at two ends of the plurality of groups of second arc-shaped clamping frames 2172, the volumes of the two groups of first arc-shaped clamping frames 2171 and the plurality of groups of second arc-shaped clamping frames 2172 are gradually reduced, and the two groups of first arc-shaped clamping frames 2171 and the plurality of groups of second arc-shaped clamping frames 2172 are in fit connection through the plurality of groups of first cards 2173 and the plurality of groups of second cards 2174 and the plurality of groups of fixing bolts.

In this embodiment, multiple sets of second clamping plates 2174 and multiple sets of first clamping plates 2173 and multiple sets of second clamping plates 2174 can be connected through multiple sets of fixing bolts, so that multiple sets of second arc-shaped clamping frames 2172 and two sets of first arc-shaped clamping frames 2171 can be fixedly connected, the second arc-shaped clamping frames 2172 are disassembled according to the diameter of the processed pipe, the number of the second arc-shaped clamping frames 2172 is adjusted to be 0 to multiple, and therefore support limitation on pipes with different diameters is adapted.

Wherein, the limiting mechanism comprises a limiting seat 31, a second motor 32, a second speed reducer 33, a driving shaft 34, a protective frame 35, two groups of driving gears 36, two groups of driven gears 37, two groups of tensioning gears 38, two groups of lead screws 39, two groups of moving pipes 310, two groups of limiting frames 311 and a plurality of groups of limiting rollers 312, the limiting seat 31 is arranged at one end of the guide mechanism, the limiting seat 31 and the guide mechanism are fixed by two groups of fixing pipes 313 in an auxiliary way, a through hole is arranged on the limiting seat 31, two groups of moving grooves are arranged on the inner wall of the through hole of the limiting seat 31, the two groups of limiting frames 311 are respectively movably arranged in the two groups of moving grooves, the protective frame 35 is arranged at one side of the limiting frame 311, the second motor 32 is arranged at the input end of the second speed reducer 33, the second speed reducer 33 is arranged on the protective frame 35, one end of the driving shaft 34 passes through the protective frame 35 and is connected with the output end of the second speed reducer 33, and the other end of the driving shaft 34 passes through the limiting seat 31 and is rotatably connected with the limiting seat 31, two sets of drive gears 36 are all installed on drive shaft 34, two sets of driven gears 37 are installed respectively on two sets of lead screws 39, two sets of lead screws 39 all pass spacing seat 31 and stretch into to two sets of shifting chutes, and two sets of lead screws 39 and spacing seat 31 contact department rotatable coupling, two sets of pipes 310 of removing are spiral-wound respectively to two sets of lead screws 39 on, and two sets of pipes 310 of removing are connected with two sets of spacing 311 respectively, the spacing roller 312 of multiunit is rotatable installation respectively in two sets of spacing 311, two sets of drive gears 36 and two sets of driven gears 37 are connected through two sets of drive chains 314 transmissions, two sets of tensioning gears 38 are rotatable installation respectively in spacing seat 31 both sides through two sets of location axle 315, and two sets of tensioning gears 38 are respectively with two sets of drive chains 314 meshing.

When the position of the pipe needs to be limited, the second motor 32 is electrified and started, the power output by the second motor 32 is reduced by the second speed reducer 33 to rotate the driving shaft 34, thereby driving the two sets of driving gears 36 to rotate, and under the driving action of the two sets of driving chains 314, the two sets of driven gears 37 drive the two sets of screw rods 39 to rotate, meanwhile, the two groups of tensioning gears 38 play a certain tensioning role for the two groups of driving chains 314, and when the two groups of screw rods 39 rotate, the two sets of moving tubes 310 can move the two sets of limiting frames 311 away from each other, and when the tube passes between the two sets of frames, the two groups of screw rods 39 are driven reversely, so that the multiple groups of limiting rollers 312 on the two groups of limiting frames clamp the pipe, and when the pipe is driven to move, the pipe can be adapted to move through the rotation of the multiple groups of limiting rollers 312, meanwhile, the height of the pipe can be limited, so that the pipe can always pass through the heating and cooling mechanism.

Concretely, still include a tub bearing structure, tub bearing structure includes positioning seat 81, first pneumatic cylinder 82, lifter 83, crane 84, backing roll 85, fixed axle 86 and two sets of spacing axle 87, positioning seat 81 is installed on guiding mechanism, first pneumatic cylinder 82 is installed on positioning seat 81, lifter 83 both ends are connected with crane 84 and first pneumatic cylinder 82 output respectively, be provided with two sets of spacing holes on the positioning seat 81, two sets of spacing axle 87 are all installed in crane 84 bottom, and two sets of spacing axle 87 insert respectively to two sets of spacing holes in, backing roll 85 suit is fixed to on the fixed axle 86, and fixed axle 86 and crane 84 rotatable coupling.

When fixed pipe 313 material, through the pipe bearing structure that this embodiment set up, can make lifter 83 drive crane 84 through controlling first pneumatic cylinder 82 and rise to make backing roll 85 and tubular product bottom contact, at the in-process that tubular product removed, can play certain supporting role to tubular product through the roll of backing roll 85, improve the accuracy of its bending.

Wherein, heating cooling body includes mounting bracket 41, two sets of dead lever 42, two sets of locating clips 43, heating coil 44, annular cooling tube 45, multiunit shower nozzle 46 and liquid delivery pipe 47, mounting bracket 41 is installed at guiding mechanism endpoint department, and mounting bracket 41 is located the stop gear left side, two sets of dead lever 42 both ends are connected with mounting bracket 41 and two sets of locating clips 43 respectively, heating coil 44 is fixed through two sets of locating clips 43, annular cooling tube 45 installs on two sets of locating clips 43 outer walls, multiunit shower nozzle 46 all communicates with annular cooling tube 45, liquid delivery pipe 47 communicates with annular cooling tube 45.

The heating coils 44 with different diameters are replaced according to the support of the pipe which needs to be bent, the heating coils 44 are fixed on the mounting frame 41 through the two groups of positioning clamps 43, the annular cooling pipe 45 can also be adjusted according to the diameter change of the pipe, when the pipe passes through the heating coils 44, the heating coils 44 are electrified to increase the temperature of the pipe, the temperature of the pipe is increased to a certain degree, the pipe can be bent in the moving process of the pipe, when the bent part leaves the part of the heating coils 44, the cooling water sent into the annular cooling pipe 45 by the plurality of groups of spray heads 46 is sprayed on the surface of the bent pipe, and therefore the bent pipe can be rapidly cooled.

Wherein, the positioning mechanism comprises a rotating arm 61, a rotating base 62, a fixed base 63, an adjusting base 64, a second hydraulic cylinder 65, a first adjusting shaft 66, a first limit rack 67, a second limit rack 68, a base 69, a first arc-shaped clamping base 610, a second arc-shaped clamping base 611, two groups of third hydraulic cylinders 612, two groups of second adjusting shafts 613, a fourth hydraulic cylinder 614, a third adjusting shaft 615 and a limit clamping block 616, a plurality of groups of clamping holes are arranged on the positioning frame 5, two ends of the first adjusting shaft 66 are respectively connected with the output end of the second hydraulic cylinder 65 and the fixed base 63, an inserting block 617 is arranged on the second hydraulic cylinder 65, the inserting block 617 is inserted into one group of clamping holes, one end of the rotating arm 61 is connected with the first arc-shaped clamping base 610, the other end of the rotating arm 61 passes through the adjusting base 64 and the first limit rack 67 and is arranged on the top of the rotating arm 61, a limit cavity is arranged inside the adjusting base 64, the second limit rack 68 is arranged in the limit cavity, the second limit rack 68 is meshed with the first limit rack 67, two sets of adjusting screws 618 are rotatably arranged on the tops of the two sets of second limit racks 68, and both the two sets of adjusting screws are screwed on the tops of the adjusting bases 64, two sets of rotating blocks 619 are respectively arranged on the tops of the two sets of adjusting screws 618, the adjusting bases 64 are fixedly connected with the rotating bases 62, the rotating bases 62 are rotatably arranged on the tops of the fixed bases 63, the fixed bases 63 are placed on the tops of the positioning frames 5, two sets of clamping blocks 620 are respectively arranged at two ends of the bottoms of the fixed bases 63, the two sets of clamping blocks 620 are fixedly connected with the fixed bases 63 through fixed bolts and nuts, the positioning frames 5 are inserted between the two sets of clamping blocks 620 and the fixed bases 63, the bases 69 are arranged at the bottoms of the first arc-shaped clamping seats 610, limit grooves are arranged on the bases 69, and the second arc-shaped clamping seats 611 are rotatably connected with the upper half areas of the first arc-shaped clamping seats 610, two groups of supports 621 are respectively arranged on the first arc-shaped clamping seat 610 and the second arc-shaped clamping seat 611, two groups of rotating shafts 622 are respectively rotatably arranged on the two groups of supports 621, two groups of second adjusting shafts 613 are respectively arranged at the output ends of the two groups of third hydraulic cylinders 612, the two groups of second adjusting shafts 613 and the two groups of third hydraulic cylinders 612 are respectively connected with the two groups of rotating shafts 622, the fourth hydraulic cylinders 614 are arranged on the outer wall of the second arc-shaped clamping seat 611, the two ends of the third adjusting shafts 615 are respectively connected with the fourth hydraulic cylinders 614 and the limiting clamping blocks 616, the first arc-shaped clamping seat 610 is provided with a hydraulic tank 623, a plurality of groups of first arc-shaped seats 624 and a plurality of groups of second arc-shaped seats 625 are respectively detachably arranged on the first arc-shaped clamping seat 610 and the second arc-shaped clamping seat 611, and the volumes of the plurality of groups of first arc-shaped seats 624 and the plurality of second arc-shaped seats 625 are sequentially reduced.

When the pipe needs to be bent, firstly two groups of clamping blocks 620 are loosened, and two groups of rotating blocks 619 are rotated, so that the two groups of rotating blocks 619 drive two groups of adjusting screws 618 and a second limiting rack 68 to ascend, leave the first limiting rack, control a second hydraulic cylinder 65 to enable a first adjusting shaft 66 to move a fixed seat 63 along the surface of a positioning frame 5, further adjust the position of the fixed seat 63 on the positioning frame 5, according to adjusting requirements of different degrees, draw out an inserting block 617 on the second hydraulic cylinder 65, extend the first adjusting shaft 66 to the farthest, insert the inserting block 617 into a corresponding clamping hole at the moment, continue to control the movement of the fixed seat 63, when the opposite direction adjustment is needed, reversely operate, after the position of the fixed seat 63 is adjusted, reversely rotate the two groups of rotating blocks 619 to enable the second limiting rack 68 to be meshed with the first limiting rack 67, the relative position between the adjusting seat 64 and the rotating arm 61 is limited, namely the adjustment of the rotating central point of the rotating arm 61 is completed, finally, two groups of clamping blocks 620 are clamped to conveniently limit the position of the fixed seat 63, when the position of the 313 material is fixed, firstly, the hydraulic tank 623 is used for controlling the fourth hydraulic cylinder 614, so that the third adjusting shaft drives the limiting clamping block 616 to ascend and leave the scattered adjusting shaft of the base 69 to drive the limiting clamping block 616 to leave the limiting groove, the limitation on the second arc-shaped clamping seat 611 is released, and the hydraulic tank 623 is used for controlling two groups of third hydraulic cylinders 612, so that the two groups of second adjusting shafts 613 drive the second arc-shaped clamping seat 611 to rotate along the connecting point between the second arc-shaped clamping seat 611 and the first arc-shaped clamping seat 610, the distance between the first arc-shaped seat 624 and the second arc-shaped seat 625 is increased, the number of the first arc-shaped seat 624 and the second arc-shaped seat 625 can be adjusted according to the diameter of the pipe to be processed, thereby being convenient to adapt to the processing of pipes with different diameters, the pipe to be processed passes through the limiting mechanism and is inserted into the positioning mechanism, at the moment, the two groups of third hydraulic cylinders 612 are controlled to reset the second arc-shaped clamping seat 611, the position of the end point of the pipe is limited by the first arc-shaped seat 624 and the second arc-shaped seat 625, the fourth hydraulic cylinders 614 are controlled to insert the limiting clamping blocks 616 into the limiting grooves, and therefore the end point of the pipe can be clamped.

When the pipe is bent, the pipe is pushed to move through the feeding mechanism, the pipe is heated through the heating and cooling mechanism, the pushed pipe continuously moves under the action of thrust, the pushed pipe rotates along the fixing seat 63 under the clamping action of the positioning mechanism, the bending diameter of the pipe is adjusted through adjusting the rotating diameter, and the processing diversity is improved.

According to the utility model, the hydraulic tank 623 is arranged on the movable first arc-shaped clamping seat 610, so that the situation that the hydraulic tank 623 is soaked in cooling water when being installed on the ground can be avoided, hydraulic pipelines adopted by hydraulic equipment controlled by the hydraulic tank can also be directly installed on the first arc-shaped clamping seat 610, the second arc-shaped clamping seat 611 and the base 69 for wiring, and the influence of disordered pipelines on the bending processing of the pipe is avoided.

The recovery mechanism comprises a hydraulic motor 71 and a roller 72, the lower half area of the positioning mechanism is provided with a recovery frame 73, the roller 72 is rotatably arranged in the recovery frame 73, the hydraulic motor 71 is arranged on the outer wall of the recovery frame 73, and the output end of the hydraulic motor 71 is connected with the roller 72.

After the pipe is bent, the pipe is taken down, the hydraulic motor 71 is driven to work through the hydraulic tank 623, the roller 72 is driven to rotate, and the base 69 can be driven to roll along the contact surface to reset by the rotation of the roller 72 and return to the initial position.

Specifically, still include receipts paying off machine and construct, receive paying off machine and construct including third motor 91, third speed reducer 92, spool 93 and rolling seat 94, rolling seat 94 installs at the stop gear top, and third motor 91 installs at the input end of third speed reducer 92, and third speed reducer 92 installs on rolling seat 94, and spool 93 is rotatable to be installed on rolling seat 94 to spool 93 passes rolling seat 94 and is connected with third speed reducer 92 output.

When equipment such as the hydraulic tank 623 on the control positioning mechanism works, the electric wire needs to be electrified, but because the continuous reciprocating motion of the positioning mechanism, the wire used by the wire collecting and releasing mechanism can be continuously collected and released, so that the wire used by the wire collecting and releasing mechanism can be kept to be always controlled, the influence of the movement of the positioning mechanism can be avoided, the continuous normal operation of the work can be kept, when the wire collecting and releasing mechanism carries out the wire collecting and releasing operation, the third motor 91 can be electrified and started, and the power output by the third motor 91 is reduced through the third speed reducer 92 to enable the reel 93 to collect or release the wire.

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.

The electrical components in the paper are all electrically connected with an external master controller and 380V industrial electricity, and the master controller can be a computer and other conventional known devices for controlling.

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 utility model, the scope of which is defined in the appended claims and their equivalents.

Claims (10)

1. The utility model provides a large-scale bending machine, its characterized in that includes feeding mechanism, heating cooling mechanism and positioning mechanism, heating cooling mechanism sets up between feeding mechanism and positioning mechanism, last locating rack (5) of being provided with of positioning mechanism to positioning mechanism can follow locating rack (5) and rotate, the positioning mechanism bottom is provided with retrieves the mechanism, locating rack (5) and feeding mechanism fixed connection, feeding mechanism includes guiding mechanism, actuating mechanism and stop gear, actuating mechanism sets up on guiding mechanism, stop gear installs in guiding mechanism one end.

2. The large pipe bender according to claim 1, characterized in that the guiding mechanism includes two sets of bottom frames (11), a plurality of sets of connecting bases (12), two sets of square supporting tubes (13), and a plurality of sets of herringbone supporting frames (14), both ends of the plurality of sets of connecting bases (12) are respectively connected with the two sets of bottom frames (11), tops of the plurality of sets of herringbone supporting frames (14) are respectively connected with the two sets of square supporting tubes (13), bottoms of the plurality of sets of herringbone supporting frames (14) are respectively connected with the plurality of sets of connecting bases (12), one end of the two sets of bottom frames (11) is provided with a connecting frame (15), and the connecting frame (15) is connected with a limiting mechanism.

3. The large pipe bender according to claim 1, wherein the driving mechanism includes a first motor (21), a first speed reducer (22), a coupling (23), a transmission shaft (24), a plurality of transmission gears (25), a plurality of transmission chains (26), a plurality of fixing clamping seats (27), a plurality of supporting frames (28), a plurality of fixing plates (29), a plurality of guide shafts (210), a plurality of guide gears (211), two sets of supporting seats (212), two sets of moving seats (213) and a pushing seat (214), the guiding mechanism is provided with a mounting seat (215), the first motor (21) is installed at an input end of the first speed reducer (22), the coupling (23) is installed at an input end of the first speed reducer (22), the first speed reducer (22) is installed on the mounting seat (215), the plurality of fixing clamping seats (27) are respectively installed on the guiding mechanism and the limiting mechanism, the transmission shaft (24) penetrates through a plurality of groups of fixed clamping seats (27) and is rotatably connected with the plurality of groups of fixed clamping seats (27), the transmission shaft (24) is connected with a coupler (23), a plurality of groups of transmission gears (25) are respectively sleeved and fixed at two ends of the transmission shaft (24), four groups of positioning plates (216) are arranged at the other end of the guide mechanism, a plurality of groups of support frames (28) are all arranged on the guide mechanism, the tops of the plurality of groups of support frames (28) are respectively connected with a plurality of groups of fixing plates (29), a plurality of groups of fixing plates (29) are respectively connected with two ends of two groups of support square tubes, a plurality of groups of guide shafts (210) are respectively rotatably arranged between the plurality of groups of fixing plates (29) and the four groups of positioning plates (216), a plurality of groups of guide gears (211) are respectively sleeved and fixed on a plurality of groups of guide shafts (210), and the plurality of groups of guide gears (211) and the transmission gears (25) are respectively in transmission connection through a plurality of transmission chains (26), two sets of supporting seats (212) are installed on the guide mechanism, the multiple sets of transmission chains (26) are respectively placed on the two sets of supporting seats (212), the two sets of moving seats (213) are respectively movably arranged on the two sets of supporting square tubes, the two sets of moving seats (213) are respectively connected with the multiple sets of transmission chains (26), the pushing seat (214) is connected with the two sets of moving seats, and two sets of first clamping mechanisms are arranged on the pushing seat (214).

4. The large bender according to claim 3, wherein the first clamping mechanism comprises two sets of first arc-shaped clamping racks (2171) and a plurality of sets of second arc-shaped clamping racks (2172), the two sets of first arc-shaped clamping racks (2171) are fixedly mounted on the push seat (214), the two sets of first arc-shaped clamping racks (2171) and the plurality of sets of second arc-shaped clamping racks (2172) are gradually reduced in volume, and the two sets of first arc-shaped clamping racks (2171) and the plurality of sets of second arc-shaped clamping racks (2172) are sequentially detachably connected.

5. The large pipe bender according to claim 1, characterized in that the limiting mechanism comprises a limiting seat (31), a second motor (32), a second speed reducer (33), a driving shaft (34), a protecting frame (35), two sets of driving gears (36), two sets of driven gears (37), two sets of tensioning gears (38), two sets of lead screws (39), two sets of moving pipes (310), two sets of limiting frames (311) and a plurality of sets of limiting rollers (312), the limiting seat (31) is installed at one end of the guiding mechanism, a through hole is arranged on the limiting seat (31), two sets of moving grooves are arranged on the inner wall of the through hole of the limiting seat (31), the two sets of limiting frames (311) are respectively movably installed in the two sets of moving grooves, the protecting frame (35) is installed at one side of the limiting frame (311), the second motor (32) is installed at the input end of the second speed reducer (33), the second speed reducer (33) is installed on a protection frame (35), one end of the driving shaft (34) penetrates through the protection frame (35) and is connected with the output end of the second speed reducer (33), the other end of the driving shaft (34) penetrates through a limiting seat (31) and is rotatably connected with the limiting seat (31), the two groups of driving gears (36) are installed on the driving shaft (34), the two groups of driven gears (37) are installed on the two groups of lead screws (39) respectively, the two groups of lead screws (39) penetrate through the limiting seat (31) and extend into the two groups of moving grooves, the contact parts of the two groups of lead screws (39) and the limiting seat (31) are rotatably connected, the two groups of moving pipes (310) are respectively screwed on the two groups of lead screws (39), the two groups of moving pipes (310) are respectively connected with the two groups of limiting frames (311), and the multiple groups of limiting rollers (312) are respectively rotatably installed in the two groups of limiting frames (311), the two groups of driving gears (36) are in transmission connection with the two groups of driven gears (37) through two groups of driving chains (314), the two groups of tensioning gears (38) are rotatably arranged on two sides of the limiting seat (31) through two groups of positioning shafts (315) respectively, and the two groups of tensioning gears (38) are meshed with the two groups of driving chains (314) respectively.

6. The large bender according to claim 1, further comprising a tube support structure, the pipe supporting structure comprises a positioning seat (81), a first hydraulic cylinder (82), a lifting rod (83), a lifting frame (84), a supporting roller (85), a fixed shaft (86) and two groups of limiting shafts (87), the positioning seat (81) is arranged on the guide mechanism, the first hydraulic cylinder (82) is arranged on the positioning seat (81), two ends of the lifting rod (83) are respectively connected with the lifting frame (84) and the output end of the first hydraulic cylinder (82), two groups of limiting holes are arranged on the positioning seat (81), the two groups of limiting shafts (87) are both arranged at the bottom of the lifting frame (84), and two sets of limit shafts (87) are respectively inserted into the two sets of limit holes, the supporting roller (85) is sleeved and fixed on the fixed shaft (86), and the fixed shaft (86) is rotatably connected with the lifting frame (84).

7. The large pipe bender according to claim 1, characterized in that the heating and cooling mechanism includes a mounting frame (41), two sets of fixing rods (42), two sets of positioning clips (43), a heating coil (44), a ring-shaped cooling pipe (45), multiple sets of spray heads (46) and a liquid feeding pipe (47), the mounting frame (41) is installed at the end point of the guiding mechanism, the mounting frame (41) is located at the left side of the limiting mechanism, the two sets of fixing rods (42) are respectively connected with the mounting frame (41) and the two sets of positioning clips (43) at two ends, the heating coil (44) is fixed by the two sets of positioning clips (43), the ring-shaped cooling pipe (45) is installed on the outer wall of the two sets of positioning clips (43), the multiple sets of spray heads (46) are all communicated with the ring-shaped cooling pipe (45), and the liquid feeding pipe (47) is communicated with the ring-shaped cooling pipe (45).

8. The large pipe bender according to claim 1, wherein the positioning mechanism comprises a rotating arm (61), a rotating base (62), a fixed base (63), an adjusting base (64), a second hydraulic cylinder (65), a first adjusting shaft (66), a first limiting rack (67), a second limiting rack (68), a base (69), a first arc-shaped clamping base (610), a second arc-shaped clamping base (611), two sets of third hydraulic cylinders (612), two sets of second adjusting shafts (613), a fourth hydraulic cylinder (614), a third adjusting shaft (615) and a limiting clamping block (616), a plurality of sets of clamping holes are formed in the positioning frame (5), two ends of the first adjusting shaft (66) are respectively connected with an output end of the second hydraulic cylinder (65) and the fixed base (63), an inserting block (617) is formed in the second hydraulic cylinder (65), and the inserting block (617) is inserted into one set of clamping holes, one end of the rotating arm (61) is connected with the first arc-shaped clamping seat (610), the other end of the rotating arm (61) penetrates through the adjusting seat (64), the first limiting rack (67) is installed at the top of the rotating arm (61), a limiting cavity is formed in the adjusting seat (64), the second limiting rack (68) is located in the limiting cavity, the second limiting rack (68) is meshed with the first limiting rack (67), two groups of adjusting screws (618) are rotatably arranged at the tops of the two groups of second limiting racks (68), the two groups of adjusting screws are screwed through the top of the adjusting seat (64), two groups of rotating blocks (619) are respectively arranged at the tops of the two groups of adjusting screws (618), the adjusting seat (64) is fixedly connected with the rotating seat (62), the rotating seat (62) is rotatably arranged at the top of the fixed seat (63), and the fixed seat (63) is placed at the top of the positioning frame (5), two ends of the bottom of the fixed seat (63) are respectively provided with two groups of clamping blocks (620), the positioning frame (5) is inserted between the two groups of clamping blocks (620) and the fixed seat (63), the base (69) is installed at the bottom of the first arc-shaped clamping seat (610), a limiting groove is arranged on the base (69), the second arc-shaped clamping seat (611) is rotatably connected with the upper half area of the first arc-shaped clamping seat (610), two groups of supporting seats (621) are respectively arranged on the first arc-shaped clamping seat (610) and the second arc-shaped clamping seat (611), two groups of rotating shafts (622) are respectively rotatably arranged on the two groups of supporting seats (621), two groups of second adjusting shafts (613) are respectively installed at the output ends of two groups of third hydraulic cylinders (612), the two groups of second adjusting shafts (613) and the two groups of third hydraulic cylinders (612) are respectively connected with the two groups of rotating shafts (622), the fourth hydraulic cylinder (614) is arranged on the outer wall of the second arc-shaped clamping seat (611), the two ends of the third adjusting shaft (615) are respectively connected with a fourth hydraulic cylinder (614) and a limiting clamping block (616), a hydraulic tank (623) is arranged on the first arc-shaped clamping seat (610), a plurality of groups of first arc-shaped seats (624) and a plurality of groups of second arc-shaped seats (625) are respectively detachably arranged on the first arc-shaped clamping seat (610) and the second arc-shaped clamping seat (611), and the volumes of the plurality of groups of first arc-shaped seats (624) and the plurality of groups of second arc-shaped seats (625) are sequentially reduced.

9. The large pipe bender according to claim 1, characterized in that the recovery mechanism comprises a hydraulic motor (71) and a roller (72), the lower half area of the positioning mechanism is provided with a recovery frame (73), the roller (72) is rotatably mounted in the recovery frame (73), the hydraulic motor (71) is mounted on the outer wall of the recovery frame (73), and the output end of the hydraulic motor (71) is connected with the roller (72).

10. The large pipe bender according to claim 1, further comprising a take-up and pay-off mechanism, wherein the take-up and pay-off mechanism comprises a third motor (91), a third speed reducer (92), a winding shaft (93) and a take-up seat (94), the take-up seat (94) is mounted on the top of the limiting mechanism, the third motor (91) is mounted at the input end of the third speed reducer (92), the third speed reducer (92) is mounted on the take-up seat (94), the winding shaft (93) is rotatably mounted on the take-up seat (94), and the winding shaft (93) passes through the take-up seat (94) and is connected with the output end of the third speed reducer (92).

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