CN217858190U - Pipe bending mechanism in large pipe bender - Google Patents

Abstract

The utility model discloses a return bend mechanism in large-scale bending machine, include: the pipe clamping device comprises a main shaft vertically supported on a machine frame head and a wheel die fixed on the top of the main shaft, wherein an installation frame and a swing arm are arranged above the wheel die, the installation frame is detachably installed on the top of the wheel die, the swing arm can be hinged on the installation frame in an up-and-down swinging mode relative to the wheel die through a pin shaft, a clamping die capable of being matched with the wheel die to clamp a pipe is fixed at the lower end of the swing arm, the swing arm is connected with a swinging driving mechanism, the swinging driving mechanism can drive the swing arm to swing downwards relative to the wheel die when the clamping die and the wheel die synchronously rotate along with the main shaft and pass through a die clamping station, and synchronously drive the swing arm to swing upwards relative to the wheel die to enable the clamping die and the wheel die to be in a relatively clamping state to clamp the pipe, and can drive the swing upwards relative to leave the wheel die and loosen the pipe when the clamping die and the wheel die synchronously rotate along with the main shaft and pass through a die stripping station. The utility model has the advantages of the safety in utilization is high and the bending machine transportation of being convenient for.

Description

Pipe bending mechanism in large pipe bender

Technical Field

The utility model relates to a return bend equipment technical field, the return bend mechanism among the concretely relates to large-scale bending machine.

Background

A large pipe bender is a pipe processing device for bending and forming a straight pipe with the inner diameter of more than 219 mm. The large pipe bender generally comprises a core rod pipe feeding mechanism, a pipe bending mechanism and an auxiliary clamping and pipe pushing mechanism, wherein the pipe bending mechanism is used for bending and forming a straight pipe, and the auxiliary clamping and pipe pushing mechanism is used for pushing the pipe into the pipe bending mechanism in the pipe bending process of the pipe bending mechanism so as to be beneficial to stable pipe bending.

The patent application number 201910490011.5 patent application named as 'split type pipe bending arm in pipe bending machine' discloses a pipe bending structure, and the structure of the pipe bending mechanism comprises: an upright main shaft is supported on a machine head of a rack, the main shaft is driven by a gear motor to rotate, a wheel mold and a pipe bending arm are sequentially fixedly sleeved on the main shaft from top to bottom, a horizontal guide rail is arranged at the top of the pipe bending arm, a sliding block is arranged on the horizontal guide rail in a sliding manner, a clamping mold capable of being matched with the wheel mold to clamp a pipe is fixed on the sliding block, a hydraulic cylinder inclining upwards is arranged below the sliding block, a cylinder body of the hydraulic cylinder is hinged to the pipe bending arm, a piston rod of the hydraulic cylinder is connected with the sliding block through a link mechanism, and the hydraulic cylinder drives the sliding block to move along the horizontal guide rail through the link mechanism to synchronously drive the clamping mold to be close to the wheel mold to clamp the pipe or keep away from the wheel mold to loosen the pipe.

The invention patent with the patent application number of 201710264241.0 and the name of a pipe bending device discloses an auxiliary pipe clamping and pushing mechanism, and the structure of the auxiliary pipe clamping and pushing mechanism comprises: the pressing pipe die comprises a die backing seat, an auxiliary clamping die, a pressing pipe die, a sliding block, a sliding plate die holder, a sliding rod mechanism and a synchronous belt dynamic pressure pipe die, wherein the die backing seat is arranged on one side of a feeding side of a clamping die station on the machine frame, the auxiliary clamping die is arranged on the die backing seat, the pressing pipe die is arranged on the other side of the feeding side of the clamping die station on the machine frame, the pressing pipe die is slidably arranged on the sliding plate die holder through the sliding block, the sliding plate die holder is fixedly arranged on the machine frame, the pressing pipe die can move along the direction parallel to the feeding direction of a pipe under the driving of a pipe pushing cylinder arranged on the sliding block, an inclined hydraulic oil cylinder is arranged below the sliding block, the body of the hydraulic oil cylinder is hinged on the machine frame, the piston rod of the hydraulic oil cylinder is connected with the sliding block through a connecting rod mechanism, and the hydraulic oil cylinder drives the sliding block to move along the direction perpendicular to move along the feeding direction of the pipe die along the direction of the vertical pipe through the connecting rod mechanism so as to enable the synchronous belt dynamic pressure pipe die to be close to or far away from the auxiliary clamping die.

The currently used pipe bending mechanism has the following disadvantages: (1) Because need install on the bent pipe arm and press from both sides the mould, be used for driving the hydraulic cylinder and one set of link mechanism that press from both sides the mould action, the bent pipe arm can be guaranteed to have sufficient installation space by the high mounting height of bent pipe arm on the main shaft, leads to the wheel mould that needs to install above the bent pipe arm also high on the main shaft, and the wheel mould is at present the epaxial mounting height of main shaft and generally exceeds 1.8 meters, promptly: the height of a pipe processing plane formed by the wheel die and the clamping die is generally more than 1.8 meters, so that when the pipe is bent, workers need to climb to the pipe processing plane to operate the pipe, the operation is inconvenient, and potential safety hazards such as falling injury and the like also exist when the workers work at a high place; (2) When the clamping die and the wheel die are matched, the distance between the clamping die and the wheel die is fixed, namely the clamping die and the wheel die can only clamp a pipe with one pipe diameter, and when a pipe with a larger pipe diameter needs to be clamped and bent, the wheel die, a whole set of pipe bending arm clamping die structure and a whole set of auxiliary clamping and pipe pushing mechanism need to be replaced simultaneously, so that the use cost of an enterprise is greatly increased; (3) The whole large pipe bender with the pipe bending arm can weigh 35 tons, wherein the pipe bending arm can weigh 7 tons, and the weight of the whole large pipe bender is far more than the hoisting weight of a traveling crane, so that the pipe bending arm needs to be dismounted from the main shaft and then hoisted to a transport vehicle before loading, and the wheel mold needs to be dismounted before dismounting the pipe bending arm because the wheel mold is positioned above the pipe bending arm; namely: before transportation, firstly detaching the wheel mould and then detaching the bent pipe arm, then respectively hoisting the wheel mould, the bent pipe arm and other complete machine parts onto a transportation vehicle, and after the destination is reached, hoisting the wheel mould, the bent pipe arm and other complete machine parts off the transportation vehicle for assembly; because the wheel molds and the pipe bending arms are heavy in weight, the disassembly and the assembly are extremely inconvenient, and a large amount of manpower and material resources are consumed; (4) The installation height of the pipe bending mechanism is high, so that the installation heights of the core rod pipe feeding mechanism and the auxiliary clamping pipe pushing mechanism which are matched with the pipe bending mechanism are also high, the installation height of the whole pipe bending machine is high, and the requirement on transport vehicles during transportation is high; (5) In the process that a worker climbs to a pipe processing plane to operate a pipe, the worker is always located in a rotation area of a pipe bending arm, the situation that the worker is injured by the rotating pipe bending arm is easy to happen, and safety is low.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a return bend mechanism in the large-scale bending machine that the safety in utilization is high and be convenient for bending machine transportation.

In order to achieve the above purpose, the utility model adopts the following technical scheme: pipe bending mechanism in large-scale bending machine includes: the pipe clamping device comprises a main shaft vertically supported on a machine frame head and driven to rotate by a main shaft driving mechanism, and a wheel die fixed on the top of the main shaft, wherein an installation frame and a swing arm are arranged above the wheel die, the installation frame is detachably installed on the top of the wheel die, the swing arm can be hinged on the installation frame in a mode of swinging up and down relative to the wheel die through a pin shaft, a clamping die capable of being matched with the wheel die to clamp a pipe is fixed at the lower end of the swing arm, the swing arm is connected with a swinging driving mechanism, the swinging driving mechanism can drive the swing arm to swing down relative to the wheel die when the clamping die and the wheel die synchronously rotate along with the main shaft and pass through a clamping die station, and synchronously drive the swing arm to swing up relative to the wheel die to synchronously drive the clamping die to swing down to be close to the wheel die so that the clamping die and the wheel die are in a relatively clamping state to clamp the pipe, and can drive the swing up relative to leave the wheel die to loosen the pipe when the clamping die and the wheel die synchronously rotate along with the main shaft and pass through a demoulding station.

Further, the pipe bending mechanism in the large pipe bending machine, wherein: the structure of the swing driving mechanism comprises: the swinging cylinder is arranged on the mounting frame, a cylinder body of the swinging cylinder is hinged with the mounting frame through a lower rotating shaft, and a piston rod of the swinging cylinder is hinged with the upper end of the swinging arm through an upper rotating shaft; the lower rotating shaft and the upper rotating shaft are all parallel to the pin shaft, and when the wheel mold and the clamping mold rotate to the clamping mold station along with the main shaft, the lower rotating shaft, the upper rotating shaft and the pin shaft are all parallel to the feeding direction of the pipe.

Further, the pipe bending mechanism in the large pipe bender, wherein: an auxiliary pipe clamping and pushing mechanism which can assist in clamping and forwards pushing the pipe in the process that the wheel die and the clamping die rotate to the demolding station along with the main shaft from the clamping die station to bend the pipe is arranged on the frame on the feeding side of the clamping die station; the structure of the auxiliary pipe clamping and pushing mechanism comprises: a die rest base is arranged on a rack on one side of the feeding side of a die clamping station, an auxiliary clamping explorator is detachably mounted on the die rest base, a mounting bracket is arranged on a rack on the other side of the feeding side of the die clamping station, a first horizontal guide rail perpendicular to the feeding direction of a pipe is arranged at the top of the mounting bracket, a sliding seat is arranged on the first horizontal guide rail in a sliding manner, a mounting base is arranged on the sliding seat, a second horizontal guide rail parallel to the feeding direction of the pipe is arranged on the mounting seat, a guide die base is arranged on the second horizontal guide rail in a sliding manner, a main clamping guide die facing the auxiliary clamping explorator is detachably mounted on the guide die base, and the guide die base moves back and forth along the second horizontal guide rail under the driving of a guide die base translation mechanism; the installation seat is arranged on the sliding seat through a positioning connection mechanism, the main clamping guide die can adjust the distance between the main clamping guide die and the auxiliary clamping guide die through the positioning connection mechanism, the sliding seat is connected with a sliding seat translation mechanism, and the sliding seat translation mechanism can drive the sliding seat to move along the first horizontal guide rail so that the main clamping guide die is close to or far away from the auxiliary clamping guide die.

Further, the pipe bending mechanism in the large pipe bending machine, wherein: the structure of slide translation mechanism includes: the lower surface of the sliding seat is provided with a first rack parallel to the first horizontal guide rail, a mounting bracket below the sliding seat is supported with a driving gear meshed with the first rack, a driving rack meshed with the driving gear is arranged below the driving gear, the driving rack is connected with a piston rod of a horizontally placed clamping cylinder, a cylinder body of the clamping cylinder is fixed on the mounting bracket, the piston rod of the clamping cylinder can drive the driving rack to translate and drive the driving gear to rotate when stretching, and the driving gear can drive the sliding seat to move along the first horizontal guide rail through the first rack when rotating, so that the main clamping guide mold is close to or far away from the auxiliary clamping profiling mold.

Further, the pipe bending mechanism in the large pipe bender, wherein: the structure of guide die holder translation mechanism includes: and the pipe pushing cylinder is arranged on the mounting seat, a cylinder body of the pipe pushing cylinder is fixed with the mounting seat, a piston rod of the pipe pushing cylinder is connected with the guide die holder, and the pipe pushing cylinder can drive the guide die holder to move along the second horizontal guide rail.

Further, the pipe bending mechanism in the large pipe bender, wherein: the structure of the positioning connecting mechanism comprises: the pipe fitting clamp comprises an upper positioning rack fixedly mounted on the upper surface of a sliding seat and parallel to a first horizontal guide rail, and a lower positioning rack fixedly mounted on the lower surface of a mounting seat and parallel to the first horizontal guide rail, wherein the upper positioning rack is meshed with the lower positioning rack, the mounting seat is positioned and placed on the sliding seat by downwards clamping the lower positioning rack onto the upper positioning rack, the mounting seat can be positioned and placed on the sliding seat at different positions along the feeding direction of vertical pipes by matching the lower positioning rack with the upper positioning rack, and the distance between a main clamping guide die and an auxiliary clamping guide die is synchronously adjusted.

Further, the pipe bending mechanism in the large pipe bending machine, wherein: and a carrier roller for supporting the driving rack is arranged on the mounting bracket below the driving rack.

Further, the pipe bending mechanism in the large pipe bending machine, wherein: the auxiliary clamp leaning die is detachably installed on the leaning die seat through a plurality of locking bolts, the main clamp guide die is detachably installed on the guide die seat through a plurality of locking bolts, and the installation frame is detachably installed at the top of the wheel die through a plurality of locking bolts.

Through the implementation of the above technical scheme, the beneficial effects of the utility model are that: (1) Through installing in the return bend mechanism that cooperates the wheel mould that comprises the mounting bracket at wheel mould top, the swing arm, swing arm actuating mechanism and clamp mould, replaced traditional the return bend mechanism that cooperates the wheel mould that comprises return bend arm, slider, clamp mould, hydraulic cylinder and one set of link mechanism of installing in wheel mould below, owing to saved the return bend arm for can reduce the wheel mould at the epaxial mounting height of main shaft, the wheel mould can reduce to 1.5 meters at the epaxial mounting center height of main shaft, promptly: the height of a pipe processing plane formed by the wheel die and the clamping die is also 1.5 m, so that when the pipe is bent, the pipe bending arm does not swing back and forth, a worker can observe the condition of front and back pipe bending at any time, and no potential safety hazard exists; the pipe can be operated only by standing on the ground without climbing by workers, so that the pipe bending machine is convenient to operate, the safety risk of clamping people when the workers tumble and return the pipe bending arm is avoided, and the use safety is improved; (2) The pipe clamping mechanism comprises a main clamping leaning die, a clamping die, a lower positioning rack, a positioning rack and an auxiliary clamping leaning die, wherein the clamping die is used for clamping and bending the pipe by swinging downwards to be close to the wheel die; the pipe bending mechanism and the auxiliary clamping and pushing mechanism can clamp and bend pipes with larger pipe diameters without increasing a slide block, replacing a wheel die, a whole set of pipe bending arm clamping die structure and a whole set of auxiliary clamping and pushing mechanism at the same time, so that the use cost of an enterprise is greatly reduced; (3) Before loading, only the mounting frame provided with the swing arm, the swing arm driving mechanism and the clamping die is required to be dismounted from the wheel die, after the destination is reached, the mounting frame provided with the swing arm, the swing arm driving mechanism and the clamping die is mounted on the wheel die, the wheel die does not need to be dismounted before loading and after unloading, the dismounting is convenient, and the time and the labor are saved; (4) On one hand, a pipe bending arm structure is omitted from the pipe bending mechanism, the overall installation height of the pipe bending mechanism is reduced, and meanwhile, a main clamp guide die driving structure matched with a gear rack and a horizontal clamping cylinder in the auxiliary clamp pipe pushing mechanism replaces a traditional main clamp guide die driving structure consisting of a slide block, a clamping die, a hydraulic oil cylinder and a set of link mechanism, so that the overall installation height of the auxiliary clamp pipe pushing mechanism is reduced, and the overall installation height of the pipe bending machine is reduced; on the other hand, before loading, the mounting base provided with the main clamp guide die can be lifted from the sliding base and moved towards the direction close to the auxiliary clamp profiling die, so that the width of the auxiliary clamp pipe pushing mechanism is shortened, and the whole width of the pipe bender is further shortened; the requirement on transport vehicles during transportation is greatly reduced due to the reduction of the overall height and width of the pipe bender.

Drawings

Fig. 1 is a schematic structural diagram of a pipe bending mechanism in a large pipe bending machine according to the present invention.

Fig. 2 is a schematic structural view of fig. 1 with the mounting bracket hidden.

Fig. 3 is a schematic structural view in the left-hand direction of fig. 2.

Fig. 4 is a schematic structural view in the right-hand direction of fig. 2.

Fig. 5 is a schematic structural view in a top view of fig. 2.

Fig. 6 is a perspective view of fig. 2.

Fig. 7 is a perspective view of fig. 2 from another angle.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.

As shown in fig. 1, 2, 3, 4, 5, 6 and 7, the pipe bending mechanism of the large pipe bender includes: the main shaft 2 is vertically supported on the machine head of the frame 1 and driven by a main shaft driving mechanism to rotate, the main shaft driving mechanism can adopt a rack and pinion type main shaft driving structure and also can adopt a chain wheel and chain type main shaft driving structure, and the rack and pinion type main shaft driving structure and the chain wheel and chain type main shaft driving structure are the prior art, so the structure is not repeated; the wheel die 3 is fixed on the top of the main shaft 2, an installation frame 4 and a swing arm 6 are arranged above the wheel die 3, the installation frame 4 is detachably installed on the top of the wheel die 3 through a plurality of locking bolts, the swing arm 6 can be hinged to the installation frame 4 in a vertically swinging mode relative to the wheel die 3 through a pin shaft 5, a clamping die 7 capable of clamping a pipe 8 in a matched mode with the wheel die 3 is fixed at the lower end of the swing arm 6, the swing arm 6 is connected with a swing driving mechanism, the swing driving mechanism can drive the swing arm 6 to swing downwards relative to the wheel die 3 when the clamping die 7 and the wheel die 3 synchronously rotate along with the main shaft 2 and pass through a die clamping station so as to synchronously drive the clamping die 7 to swing downwards to be close to the wheel die 3 and enable the clamping die 7 and the wheel die 3 to clamp the pipe 8 in a relatively clamped mode, and can drive the swing upwards relative to the wheel die 3 when the clamping die 7 and the wheel die 3 synchronously rotate along with the main shaft 2 and pass through a die stripping station so as to drive the swing arm 6 to swing upwards relative to leave the wheel die 3 and loosen the wheel die 8; in the present embodiment, the structure of the swing drive mechanism includes: the swinging cylinder 9 is arranged on the mounting frame 4, the cylinder body of the swinging cylinder 9 is hinged with the mounting frame 4 through a lower rotating shaft 10, and the piston rod of the swinging cylinder 9 is hinged with the upper end of the swinging arm 6 through an upper rotating shaft 11; the lower rotating shaft 10 and the upper rotating shaft 11 are all parallel to the pin shaft 5, when the wheel mold 3 and the clamping mold 7 rotate to a clamping mold station along with the main shaft 2, the lower rotating shaft 10, the upper rotating shaft 11 and the pin shaft 5 are all parallel to the feeding direction of the pipe, when a piston rod of the swinging cylinder 9 extends out, the swinging arm 6 can be driven to swing downwards relative to the wheel mold 3 to synchronously drive the clamping mold 7 to swing downwards to be close to the wheel mold 3 so that the clamping mold 7 and the wheel mold 3 are in a relative clamping state to clamp the pipe 8, and when the piston rod of the swinging cylinder 9 retracts, the swinging arm 6 can be driven to swing upwards relative to the wheel mold 3 to synchronously drive the clamping mold 7 to swing upwards to leave the wheel mold 3 so as to loosen the pipe 8;

in the embodiment, an auxiliary pipe clamping and pushing mechanism which can assist in clamping and forwards pushing the pipe 8 in the process of bending the pipe 8 by rotating the wheel die 3 and the clamping die 7 along with the main shaft 2 from the die clamping station to the demolding station is arranged on the frame 1 on the feeding side of the die clamping station; the structure of the auxiliary pipe clamping and pushing mechanism comprises: a die rest base 12 is arranged on a frame 1 on one side of a feeding side of a die clamping station, an auxiliary die rest 13 is detachably mounted on the die rest base 12, the auxiliary die rest 13 is detachably mounted on the die rest base 12 through a plurality of locking bolts, a mounting bracket 14 is arranged on a frame 1 on the other side of the feeding side of the die clamping station, a first horizontal guide rail 15 perpendicular to a pipe feeding direction is arranged at the top of the mounting bracket 14, a sliding base 16 is slidably arranged on the first horizontal guide rail 15, a mounting base 17 is arranged on the sliding base 16, a second horizontal guide rail 18 parallel to the pipe feeding direction is arranged on the mounting base 17, a guide die base 19 is slidably arranged on the second horizontal guide rail 18, a main die rest 20 facing the auxiliary die rest 13 is detachably mounted on the guide die base 19, and the main die rest 20 is detachably mounted on the guide die base 19 through a plurality of locking bolts; the guide die holder 19 is driven by the guide die holder translation mechanism to move back and forth along the second horizontal guide rail 18; in this embodiment, the structure of the guide die holder translation mechanism includes: the pipe pushing cylinder 21 is arranged on the mounting seat 17, a cylinder body of the pipe pushing cylinder 21 is fixed with the mounting seat 17, a piston rod of the pipe pushing cylinder 21 is connected with the guide die holder 19, and the pipe pushing cylinder 21 can drive the guide die holder 19 to move along the second horizontal guide rail 18; the mounting seat 17 is arranged on the sliding seat 16 through a positioning connection mechanism, the distance between the main clamping guide die 20 and the auxiliary clamping guide die 13 can be adjusted through the positioning connection mechanism, the sliding seat 16 is connected with a sliding seat translation mechanism, and the sliding seat translation mechanism can drive the sliding seat 16 to move along the first horizontal guide rail 15 so as to enable the main clamping guide die 20 to be close to or far away from the auxiliary clamping guide die 13;

in this embodiment, the structure of the carriage translation mechanism includes: a first rack 22 parallel to the first horizontal guide rail 15 is arranged on the lower surface of the slide 16, a driving gear 23 meshed with the first rack 22 is supported on the mounting bracket 14 below the slide 16, a driving rack 24 meshed with the driving gear 23 is arranged below the driving gear 23, the driving rack 24 is connected with a piston rod of a horizontally placed clamping cylinder 25, a cylinder body of the clamping cylinder 25 is fixedly mounted on the mounting bracket 14, when the piston rod of the clamping cylinder 25 extends and retracts, the driving gear 23 is driven to rotate by driving the driving rack 24 to translate, and when the driving gear 23 rotates, the slide 16 is driven by the first rack 22 to move along the first horizontal guide rail 15, so that the main clamping guide mold 20 is close to or far away from the auxiliary clamping die 13;

in this embodiment, the structure of the positioning connection mechanism includes: an upper positioning rack 26 fixedly mounted on the upper surface of the sliding seat 16 and parallel to the first horizontal guide rail 15, and a lower positioning rack 27 fixedly mounted on the lower surface of the mounting seat 17 and parallel to the first horizontal guide rail 15, wherein the upper positioning rack 26 is meshed with the lower positioning rack 27, the mounting seat 17 is positioned and placed on the sliding seat 16 by clamping the lower positioning rack 27 to the upper positioning rack 26 downwards, and the mounting seat 17 can be positioned and placed on the sliding seat 16 at different positions along the vertical pipe feeding direction by matching the lower positioning rack 27 and the upper positioning rack 26, so as to synchronously adjust the distance between the main clamping and leaning mold 20 and the auxiliary clamping and leaning mold 13; in the embodiment, the mounting bracket 14 below the driving rack 24 is provided with the carrier roller 28 for supporting the driving rack 24, and the carrier roller 28 can make the driving rack 24 move more stably, so that the use stability of the equipment is improved;

before pipe bending, the position of the mounting seat 17 on the sliding seat 16 is adjusted, so that the distance between the main clamping guide die 20 and the auxiliary clamping leaning die 13 is matched with a pipe to be bent when the dies are closed; then one end of the pipe 8 to be bent is placed between the core rod pipe feeding mechanism and the auxiliary clamping and pushing mechanism, and the other end of the pipe is placed between the main clamping guide die 20 and the auxiliary clamping and leaning die 13 of the auxiliary clamping and pushing mechanism and is placed between the wheel die 3 and the clamping die 7 of the pipe bending mechanism;

when the pipe bending machine works, a piston rod of the swing cylinder 9 is firstly extended out to drive the swing arm 6 to swing downwards relative to the wheel mold 3 so as to synchronously drive the clamping mold 7 to swing downwards to be close to the wheel mold 3, so that the clamping mold 7 and the wheel mold 3 are in a relative clamping state to clamp a pipe 8, meanwhile, the piston rod of the clamping cylinder 25 is retracted to drive the driving rack 24 to translate so as to drive the driving gear 23 to rotate, when the driving gear 23 rotates, the first rack 22 drives the sliding seat 16 to move towards the direction close to the auxiliary clamping mold 13 along the first horizontal guide rail 15, and the mounting seat 17 provided with the main clamping mold 20 is synchronously driven to move towards the direction close to the auxiliary clamping mold 13 until the main clamping mold 20 and the auxiliary clamping mold 13 clamp the pipe 8 to be bent;

then, the main shaft driving mechanism drives the main shaft 2 to rotate, the wheel mold 3 and the clamping mold 7 are synchronously driven to rotate from the mold clamping station to the demolding station, so that the wheel mold 3 and the clamping mold 7 bend the pipe to be bent, and in the process of bending the pipe to be bent by the wheel mold 3 and the clamping mold 7, the pipe pushing cylinder 21 pushes the main clamping guide mold 20 to move towards the mold closing station through the guide mold seat 19, and synchronously pushes the pipe to be bent to move forwards;

after the pipe is bent and formed, a piston rod of the swing cylinder 9 is retracted to drive the swing arm 6 to swing upwards relative to the wheel mold 3 so as to synchronously drive the clamping mold 7 to swing upwards to leave the wheel mold 3 and loosen the pipe 8; then, the main shaft driving mechanism drives the main shaft 2 to rotate reversely, and drives the wheel mold 3 and the clamping mold 7 to rotate and reset from the demolding station to the clamping mold station; and simultaneously, a piston rod of the clamping cylinder 25 extends out, the driving gear 23 is driven to rotate reversely by the driving rack 24, and when the driving gear 23 rotates reversely, the sliding seat 16 is driven by the first rack 22 to move along the first horizontal guide rail 15 in the direction far away from the auxiliary clamping die 13, and the mounting seat 17 provided with the main clamping die 20 is synchronously driven to move in the direction far away from the auxiliary clamping die 13 until the main clamping die 20 and the auxiliary clamping die 13 release the pipe 8 to be bent, and the next pipe bending operation is waited.

The utility model has the advantages that: (1) Through installing in the return bend mechanism that cooperates the wheel mould that comprises the mounting bracket at wheel mould top, the swing arm, swing arm actuating mechanism and clamp mould, replaced traditional the return bend mechanism that cooperates the wheel mould that comprises return bend arm, slider, clamp mould, hydraulic cylinder and one set of link mechanism of installing in wheel mould below, owing to saved the return bend arm for can reduce the wheel mould at the epaxial mounting height of main shaft, the wheel mould can reduce to 1.5 meters at the epaxial mounting center height of main shaft, promptly: the height of a pipe processing plane formed by the wheel die and the clamping die is also 1.5 m, so that when the pipe is bent, the pipe bending arm does not swing back and forth, a worker can observe the condition of front and back pipe bending at any time, and no potential safety hazard exists; the pipe can be operated only by standing on the ground without climbing by workers, so that the pipe bending machine is convenient to operate, the safety risk of clamping people when the workers tumble and return the pipe bending arm is avoided, and the use safety is improved; (2) The pipe clamping mechanism comprises a main clamping leaning die, a clamping die, a lower positioning rack, a positioning rack and an auxiliary clamping leaning die, wherein the clamping die is used for clamping and bending the pipe by swinging downwards to be close to the wheel die; the pipe bending mechanism and the auxiliary clamping and pushing mechanism can clamp and bend pipes with larger pipe diameters without increasing a slide block, replacing a wheel die, a whole set of pipe bending arm clamping die structure and a whole set of auxiliary clamping and pushing mechanism at the same time, so that the use cost of an enterprise is greatly reduced; (3) Before loading, only the mounting frame provided with the swing arm, the swing arm driving mechanism and the clamping die is required to be dismounted from the wheel die, after the destination is reached, the mounting frame provided with the swing arm, the swing arm driving mechanism and the clamping die is mounted on the wheel die, the wheel die does not need to be dismounted before loading and after unloading, the dismounting is convenient, and the time and the labor are saved; (4) On one hand, a pipe bending arm structure is omitted from the pipe bending mechanism, the overall installation height of the pipe bending mechanism is reduced, and meanwhile, a main clamp guide die driving structure matched with a gear rack and a horizontal clamping cylinder in the auxiliary clamp pipe pushing mechanism replaces a traditional main clamp guide die driving structure consisting of a slide block, a clamping die, a hydraulic oil cylinder and a set of link mechanism, so that the overall installation height of the auxiliary clamp pipe pushing mechanism is reduced, and the overall installation height of the pipe bending machine is reduced; on the other hand, before loading, the mounting base provided with the main clamp guide die can be lifted from the sliding base and moved towards the direction close to the auxiliary clamp profiling die, so that the width of the auxiliary clamp pipe pushing mechanism is shortened, and the whole width of the pipe bender is further shortened; the requirement on transport vehicles during transportation is greatly reduced due to the reduction of the overall height and width of the pipe bender.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any modifications or equivalent changes made in accordance with the technical spirit of the present invention are also within the scope of the present invention.

Claims (8)

1. Pipe bending mechanism in large-scale bending machine includes: the vertical supporting is in the frame aircraft nose and by the rotatory main shaft of main shaft drive mechanism drive to and be fixed in the wheel mould at main shaft top, its characterized in that: the pipe clamping device is characterized in that an installation frame and a swing arm are arranged above the wheel die, the installation frame is detachably installed at the top of the wheel die, the swing arm can be hinged to the installation frame in a vertically swinging mode relative to the wheel die through a pin shaft, a clamping die capable of being matched with the wheel die to clamp a pipe is fixed at the lower end of the swing arm, the swing arm is connected with a swing driving mechanism, the swing driving mechanism can drive the swing arm to swing downwards relative to the wheel die when the clamping die and the wheel die synchronously rotate along with a main shaft and pass through a clamping die station to synchronously drive the clamping die to swing downwards to be close to the wheel die so that the clamping die and the wheel die are clamped relatively to clamp the pipe, and can drive the swing arm to swing upwards relative to the wheel die to synchronously drive the swing upwards to leave the wheel die and loosen the pipe when the clamping die and the wheel die synchronously rotate along with the main shaft and pass through a demoulding station.

2. The tube bending mechanism in a large tube bending machine according to claim 1, wherein: the structure of the swing driving mechanism comprises: the swinging cylinder is arranged on the mounting frame, a cylinder body of the swinging cylinder is hinged with the mounting frame through a lower rotating shaft, and a piston rod of the swinging cylinder is hinged with the upper end of the swinging arm through an upper rotating shaft; the lower rotating shaft and the upper rotating shaft are all parallel to the pin shaft, and when the wheel mold and the clamping mold rotate to the clamping mold station along with the main shaft, the lower rotating shaft, the upper rotating shaft and the pin shaft are all parallel to the feeding direction of the pipe.

3. The tube bending mechanism in a large tube bending machine according to claim 1, wherein: an auxiliary clamping and pipe pushing mechanism which can assist in clamping and forwards push the pipe in the process that the wheel die and the clamping die rotate to the demolding station along with the main shaft from the clamping die station is arranged on the machine frame on the feeding side of the clamping die station; the structure of the auxiliary pipe clamping and pushing mechanism comprises: a die rest base is arranged on a rack on one side of the feeding side of a die clamping station, an auxiliary clamping explorator is detachably mounted on the die rest base, a mounting bracket is arranged on a rack on the other side of the feeding side of the die clamping station, a first horizontal guide rail perpendicular to the feeding direction of a pipe is arranged at the top of the mounting bracket, a sliding seat is arranged on the first horizontal guide rail in a sliding manner, a mounting base is arranged on the sliding seat, a second horizontal guide rail parallel to the feeding direction of the pipe is arranged on the mounting seat, a guide die base is arranged on the second horizontal guide rail in a sliding manner, a main clamping guide die facing the auxiliary clamping explorator is detachably mounted on the guide die base, and the guide die base moves back and forth along the second horizontal guide rail under the driving of a guide die base translation mechanism; the installation seat is arranged on the sliding seat through a positioning connection mechanism, the main clamping guide die can adjust the distance between the main clamping guide die and the auxiliary clamping guide die through the positioning connection mechanism, the sliding seat is connected with a sliding seat translation mechanism, and the sliding seat translation mechanism can drive the sliding seat to move along the first horizontal guide rail so that the main clamping guide die is close to or far away from the auxiliary clamping guide die.

4. The tube bending mechanism in a large tube bending machine according to claim 3, wherein: the structure of slide translation mechanism includes: the lower surface of the sliding seat is provided with a first rack parallel to a first horizontal guide rail, a mounting bracket below the sliding seat is supported with a driving gear meshed with the first rack, a driving rack meshed with the driving gear is arranged below the driving gear, the driving rack is connected with a piston rod of a horizontally placed clamping cylinder, a cylinder body of the clamping cylinder is fixed on the mounting bracket, the piston rod of the clamping cylinder can drive the driving rack to translate to drive the driving gear to rotate when stretching, and the driving gear can drive the sliding seat to move along the first horizontal guide rail through the first rack when rotating, so that the main clamping guide die is close to or far away from the auxiliary clamping template.

5. The tube bending mechanism in a large tube bending machine according to claim 3, wherein: the structure of guide die holder translation mechanism includes: and the pipe pushing cylinder is arranged on the mounting seat, a cylinder body of the pipe pushing cylinder is fixed with the mounting seat, a piston rod of the pipe pushing cylinder is connected with the guide die holder, and the pipe pushing cylinder can drive the guide die holder to move along the second horizontal guide rail.

6. The pipe bending mechanism in a large pipe bender according to claim 3, wherein: the structure of the positioning connecting mechanism comprises: the pipe fitting clamp comprises an upper positioning rack fixedly mounted on the upper surface of a sliding seat and parallel to a first horizontal guide rail, and a lower positioning rack fixedly mounted on the lower surface of a mounting seat and parallel to the first horizontal guide rail, wherein the upper positioning rack is meshed with the lower positioning rack, the mounting seat is positioned and placed on the sliding seat by downwards clamping the lower positioning rack onto the upper positioning rack, the mounting seat can be positioned and placed on the sliding seat at different positions along the feeding direction of vertical pipes by matching the lower positioning rack with the upper positioning rack, and the distance between a main clamping guide die and an auxiliary clamping guide die is synchronously adjusted.

7. The pipe bending mechanism of a large pipe bender according to any of claims 1-6, wherein: and a carrier roller for supporting the driving rack is arranged on the mounting bracket below the driving rack.

8. The tube bending mechanism of the large tube bending machine according to claim 7, wherein: the auxiliary clamp leaning die is detachably installed on the leaning die seat through a plurality of locking bolts, the main clamp guide die is detachably installed on the guide die seat through a plurality of locking bolts, and the installation frame is detachably installed at the top of the wheel die through a plurality of locking bolts.

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