A pipe bending mechanism in a large pipe bending machine

Abstract

The present invention discloses a pipe bending mechanism for a large pipe bending machine, comprising: a main shaft uprightly supported on a machine head and a wheel die fixed to the top of the main shaft; a mounting frame and a swing arm provided above the wheel die; the mounting frame being detachably mounted on the top of the wheel die; the swing arm being hingedly connected to the mounting frame via a pin so as to swing up and down relative to the wheel die; a clamping die adapted to clamp a pipe material with the wheel die fixed to the lower end of the swing arm; the swing arm being connected to a swing drive mechanism; the swing drive mechanism being capable of driving the swing arm to swing downward relative to the wheel die when the clamping die and the wheel die rotate synchronously with the main shaft and pass through a clamping station, thereby simultaneously driving the clamping die to swing downward toward the wheel die, thereby causing the clamping die and the wheel die to clamp the pipe material in a relative clamping state; and being capable of driving the swing arm to swing upward relative to the wheel die when the clamping die and the wheel die rotate synchronously with the main shaft and pass through a demolding station, thereby simultaneously driving the clamping die to swing upward away from the wheel die, thereby releasing the pipe material. The present invention has the advantages of high safety in use and convenient transportation of the pipe bending machine.

Description

Technical Field

[0001] The present invention relates to the technical field of pipe bending equipment, in particular to a pipe bending mechanism in a large pipe bending machine. Background Art

[0002] A large-scale pipe bender is a type of pipe processing equipment used to bend straight pipes with an inner diameter greater than 219mm. It generally consists of a mandrel feeding mechanism, a bending mechanism, and an auxiliary clamping and pushing mechanism. The bending mechanism is used to bend straight pipes, while the auxiliary clamping and pushing mechanism is used to guide the pipe into the bending mechanism during the bending process, facilitating stable bending.

[0003] The invention patent with patent application number 201910490011.5 and patent name "Split Bending Arm in Pipe Bending Machine" discloses a pipe bending structure, the structure of the pipe bending mechanism includes: an upright main shaft is supported on the head of the frame, the main shaft is driven to rotate by a reduction motor, and a wheel mold and a pipe bending arm are fixed on the main shaft from top to bottom in sequence, a horizontal guide rail is provided on the top of the pipe bending arm, a slider is slidingly provided on the horizontal guide rail, a clamping die that can adapt to the wheel mold to clamp the pipe is fixed on the slider, and an upwardly inclined hydraulic cylinder is provided below the slider, the cylinder body of the hydraulic cylinder is hinged to the pipe bending arm, the piston rod of the hydraulic cylinder is connected to the slider through a connecting rod mechanism, and the hydraulic cylinder drives the slider to move along the horizontal guide rail through the connecting rod mechanism, and synchronously drives the clamping die to approach the wheel mold to clamp the pipe or move away from the wheel mold to loosen the pipe.

[0004] The invention patent with patent application number 201710264241.0 and patent name "Pipe Bending Device" discloses an auxiliary clamping and pushing tube mechanism, the structure of which includes: a die seat arranged on one side of the frame on the feeding side of the clamping station, an auxiliary clamping die installed on the die seat, a tube pressing die arranged on the other side of the frame on the feeding side of the clamping station, the tube pressing die is slidably installed on the slide die seat through a slider, the slide die seat is fixedly installed on the frame, the tube pressing die can move in a direction parallel to the pipe feeding direction under the drive of the tube pushing cylinder installed on the slider, an upwardly inclined hydraulic cylinder is provided under the slider, the cylinder body of the hydraulic cylinder is hingedly connected to the frame, the piston rod of the hydraulic cylinder is connected to the slider through a connecting rod mechanism, the hydraulic cylinder drives the slider to move in a direction perpendicular to the pipe feeding direction through the connecting rod mechanism and synchronously drives the tube pressing die close to or away from the auxiliary clamping die.

[0005] The pipe bending mechanism currently used has the following disadvantages: (1) Since the pipe bending arm needs to be installed with a clamping die, a hydraulic cylinder for driving the clamping die, and a set of connecting rod mechanisms, the installation height of the pipe bending arm on the main shaft is high to ensure that the pipe bending arm has sufficient installation space, resulting in the wheel die installed above the pipe bending arm also having a high installation height on the main shaft. At present, the installation height of the wheel die on the main shaft generally exceeds 1.8 meters, that is, the height of the pipe processing plane formed by the wheel die and the clamping die is also generally more than 1.8 meters, which requires workers to climb when bending pipes. It is not only inconvenient to operate the pipe on the pipe processing plane, but also there are safety hazards such as falls when workers work at heights; (2) The distance between the clamping die and the wheel die is fixed when the two are closed, that is, the clamping die and the wheel die can only clamp pipes of one diameter. When a larger diameter pipe needs to be clamped and bent, the wheel die, the entire set of bending arm clamping die structure, and the entire set of auxiliary clamping and pushing mechanisms need to be replaced at the same time, which greatly increases the cost of use for the enterprise; (3) The weight of a large pipe bending machine with a bending arm can reach 35 tons, of which The weight of the pipe bending arm reaches 7 tons. Since the weight of the large pipe bending machine is far more than the lifting weight of the crane, the pipe bending arm needs to be removed from the main shaft and then hoisted onto the transport vehicle separately before loading. Since the wheel mold is located above the pipe bending arm, the wheel mold needs to be removed before removing the pipe bending arm. That is, before transportation, the wheel mold is removed first and then the pipe bending arm, and then the wheel mold, pipe bending arm and other parts of the whole machine are hoisted onto the transport vehicle separately. After arriving at the destination, the wheel mold, pipe bending arm and other parts of the whole machine are hoisted off from the transport vehicle. (4) Due to the high installation height of the pipe bending mechanism, the installation height of the core rod pipe feeding mechanism and the auxiliary clamp pipe pushing mechanism is also high, resulting in a high installation height of the entire pipe bending machine, which places high demands on the transport vehicle during transportation; (5) When workers climb to the pipe processing plane to operate the pipe, they are always in the rotating area of ​​the pipe bending arm, and it is very easy for workers to be injured by the rotating pipe bending arm, which reduces safety. Summary of the Invention

[0006] The purpose of the present invention is to provide a pipe bending mechanism for a large pipe bending machine which has high use safety and is convenient for transportation of the pipe bending machine.

[0007] The cam is fixed to the top of the wheel mold, and the cam is hinged on the top of the wheel mold and can swing up and down relative to the wheel mold.

[0008] Furthermore, the aforementioned pipe bending mechanism in a large pipe bending machine, wherein: the structure of the swing drive mechanism includes: a swing cylinder arranged on a mounting frame, the cylinder body of the swing cylinder is hinged to the mounting frame through a lower rotating shaft, and the piston rod of the swing cylinder is hinged to the upper end of the swing arm through an upper rotating shaft; the lower rotating shaft and the upper rotating shaft are both parallel to the pin shaft, and when the wheel mold and the clamping mold rotate to the clamping mold station 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.

[0009] Furthermore, the aforementioned tube bending mechanism in a large tube bending machine, wherein: an auxiliary clamping and pushing tube mechanism is provided on the frame on the feeding side of the clamping die station, which can assist in clamping and pushing the tube forward during the process of bending the tube by rotating the wheel die and the clamping die from the clamping die station to the demoulding die station along with the main shaft; the structure of the auxiliary clamping and pushing tube mechanism includes: a backing die seat is provided on one side frame on the feeding side of the clamping die station, an auxiliary clamping backing die is detachably installed on the backing die seat, a mounting bracket is provided on the other side frame on the feeding side of the clamping die station, a first horizontal guide rail perpendicular to the feeding direction of the tube is provided on the top of the mounting bracket, and a slide seat is slidably provided on the first horizontal guide rail. A mounting seat is provided on the slide, and a second horizontal guide rail parallel to the feeding direction of the pipe is provided on the mounting seat, and a guide die seat is slidably provided on the second horizontal guide rail, and a main clamping guide die facing the auxiliary clamping mold is detachably installed on the guide die seat, and the guide die seat moves back and forth along the second horizontal guide rail under the drive of the guide die seat translation mechanism; the mounting seat is set on the slide through a positioning connection mechanism, and the main clamping guide die can adjust the distance between it and the auxiliary clamping mold through the positioning connection mechanism, and the slide is connected to the slide translation mechanism, and the slide translation mechanism can drive the slide to move along the first horizontal guide rail to make the main clamping guide die approach or move away from the auxiliary clamping mold.

[0010] Furthermore, the aforementioned pipe bending mechanism in a large pipe bending machine, wherein: the structure of the slide translation mechanism includes: a first rack parallel to the first horizontal guide rail is provided on the lower surface of the slide, a driving gear meshed with the first rack is supported on the mounting bracket below the slide, a driving rack meshed with the driving gear is provided below the driving gear, the driving rack is connected to the piston rod of a horizontally placed clamping cylinder, the cylinder body of the clamping cylinder is fixed on the mounting bracket, and the piston rod of the clamping cylinder can drive the driving rack to translate and drive the driving gear to rotate when it is extended and retracted, and when the driving gear rotates, it can drive the slide to move along the first horizontal guide rail through the first rack, so that the main clamping guide die is close to or away from the auxiliary clamping die.

[0011] Furthermore, the aforementioned pipe bending mechanism in a large pipe bending machine, wherein: the structure of the guide die seat translation mechanism includes: a pipe pushing cylinder arranged on the mounting seat, the cylinder body of the pipe pushing cylinder is fixed to the mounting seat, the piston rod of the pipe pushing cylinder is connected to the guide die seat, and the pipe pushing cylinder can drive the guide die seat to move along the second horizontal guide rail.

[0012] Furthermore, the aforementioned pipe bending mechanism in a large pipe bending machine, wherein: the structure of the positioning connection mechanism includes: an upper positioning rack fixedly mounted on the upper surface of the slide and parallel to the first horizontal guide rail, and a lower positioning rack fixedly mounted on the lower surface of the mounting seat and parallel to the first horizontal guide rail, the upper positioning rack is meshed with the lower positioning rack, the mounting seat is positioned on the slide by downwardly engaging the lower positioning rack with the upper positioning rack, and the mounting seat can be positioned on the slide at different positions along the vertical pipe feeding direction through the cooperation of the lower positioning rack and the upper positioning rack, and the distance between the main clamping guide die and the auxiliary clamping backing die is synchronously adjusted.

[0013] Furthermore, in the aforementioned pipe bending mechanism of a large pipe bending machine, a roller for supporting the driving rack is provided on the mounting bracket below the driving rack.

[0014] Furthermore, the aforementioned pipe bending mechanism in a large pipe bending machine, wherein: the auxiliary clamping die is detachably mounted on the die base by a number of locking bolts, the main clamping guide die is detachably mounted on the guide die base by a number of locking bolts, and the mounting frame is detachably mounted on the top of the wheel die by a number of locking bolts.

[0015] Through the implementation of the above technical solution, the beneficial effects of the present invention are as follows: (1) the pipe bending mechanism composed of the mounting frame, the swing arm, the swing arm driving mechanism and the clamping die installed on the top of the wheel mold replaces the traditional pipe bending mechanism composed of the pipe bending arm, the slider, the clamping die, the hydraulic cylinder and a set of connecting rod mechanisms installed below the wheel mold. Since the pipe bending arm is omitted, the installation height of the wheel mold on the main shaft can be reduced, and the installation center height of the wheel mold on the main shaft can be reduced to 1.5 meters, that is, the height of the pipe processing plane formed by the wheel mold and the clamping die is generally 1.5 meters. In this way, when bending pipes, there is no pipe bending arm rotating back and forth, and workers can observe the front and back at any time. There is no safety hazard in the case of pipe bending; and workers do not need to climb, they can operate the pipe by standing on the ground, which is not only convenient to operate, but also avoids the safety risk of workers falling and people being pinched when the pipe bending arm retreats, thereby improving the safety of use; (2) Since the clamping die is clamped by swinging down close to the wheel die, when a pipe with a larger diameter needs to be clamped and bent, it is only necessary to replace the wheel die and the clamping die separately, and lift the mounting seat with the main clamping guide die from the slide and move it away from the auxiliary clamping die until the position of the main clamping guide die can adapt to the auxiliary clamping die to clamp the pipe of the new diameter, and then position it on the slide by engaging the lower positioning rack with the upper positioning rack. , so that the auxiliary clamping and pushing tube mechanism can clamp and bend larger-sized tubes; there is no need to enlarge the slider, replace the wheel die, the entire set of bending arm clamping die structure, and the entire set of auxiliary clamping and pushing tube mechanism at the same time, so that the bending mechanism and the auxiliary clamping and pushing tube mechanism can clamp and bend larger-diameter tubes, which greatly reduces the cost of use for the enterprise; (3) Before loading, it is only necessary to remove the mounting frame equipped with the swing arm, the swing arm driving mechanism and the clamping die from the wheel die, and then install the mounting frame equipped with the swing arm, the swing arm driving mechanism and the clamping die on the wheel die after arriving at the destination. There is no need to disassemble the wheel die before loading and after unloading, which is convenient for disassembly and assembly, saving time and effort; (4) On the one hand, the bending mechanism eliminates the need for the bending mechanism. The tube arm structure reduces the overall installation height of the tube bending mechanism. At the same time, the main clamping guide die driving structure coordinated with the gear rack and the horizontal clamping cylinder in the auxiliary clamping and tube pushing mechanism replaces the traditional main clamping guide die driving structure composed of a slide block, a clamping die, a hydraulic cylinder and a set of connecting rod mechanisms, thereby reducing the overall installation height of the auxiliary clamping and tube pushing mechanism, thereby reducing the overall installation height of the tube bending machine. On the other hand, before loading, the width of the auxiliary clamping and tube pushing mechanism can be shortened by lifting the mounting seat equipped with the main clamping guide die from the slide seat and moving it in the direction close to the auxiliary clamping backing die, thereby shortening the overall width of the tube bending machine. Due to the reduction in the overall height and width of the tube bending machine, the requirements for the transport vehicle during transportation are greatly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The figure is a schematic structural diagram of a pipe bending mechanism in a large pipe bending machine according to the present invention.

[0017] Figure 2 for Figure 1 The structural diagram after the bracket is installed is hidden in the figure.

[0018] Figure 3 for Figure 2 Schematic diagram of the structure from the left view direction.

[0019] Figure 4 for Figure 2 Schematic diagram of the structure from the right side.

[0020] Figure 5 for Figure 2 Schematic diagram of the structure from a top-down perspective.

[0021] Figure 6 for Figure 2 Schematic diagram of the three-dimensional structure from one perspective.

[0022] Figure 7 for Figure 2 Schematic diagram of the three-dimensional structure from another perspective. DETAILED DESCRIPTION

[0023] In order to make the objectives, 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.

[0024] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7As shown, the pipe bending mechanism in the large pipe bending machine includes: a main shaft 2 uprightly supported on the head of the frame 1 and driven to rotate by the main shaft driving mechanism, the main shaft driving mechanism can adopt a rack and pinion main shaft driving structure, and can also adopt a sprocket and chain main shaft driving structure. The rack and pinion main shaft driving structure and the sprocket and chain main shaft driving structure are both existing technologies, so the structure is not repeated; and a wheel mold 3 fixed to the top of the main shaft 2, and a mounting frame 4 and a swing arm 6 are provided above the wheel mold 3. The mounting frame 4 is connected to the main shaft 2. The swing arm 6 is detachably mounted on the top of the wheel die 3 by a number of locking bolts. The swing arm 6 is hingedly connected to the mounting frame 4 by a pin 5 so as to swing up and down relative to the wheel die 3. A clamping die 7 that can adapt to the wheel die 3 and clamp the pipe 8 is fixed at the lower end of the swing arm 6. The swing arm 6 is connected to a swing driving mechanism. The swing driving mechanism can drive the swing arm 6 to swing downward relative to the wheel die 3 when the clamping die 7 and the wheel die 3 rotate synchronously with the main shaft 2 and pass through the clamping die station, thereby synchronously driving the clamping die 7 to swing downward close to the wheel die 3 so that the clamping die 7 and the wheel die 3 are relative. The pipe 8 is clamped in a clamping manner, and when the clamping die 7 and the wheel die 3 rotate synchronously with the main shaft 2 and pass through the demoulding station, the swing arm 6 is driven to swing upward relative to the wheel die 3, and the clamping die 7 is synchronously driven to swing upward away from the wheel die to release the pipe 8; in this embodiment, the structure of the swing drive mechanism includes: a swing cylinder 9 provided on the mounting frame 4, the cylinder body of the swing cylinder 9 is hinged to the mounting frame 4 through the lower rotating shaft 10, and the piston rod of the swing cylinder 9 is hinged to the upper end of the swing arm 6 through the upper rotating shaft 11; the lower rotating shaft 10 and the upper rotating shaft 11 are both connected to the pin 5, and when the wheel die 3 and the clamping die 7 rotate to the clamping position along with the main shaft 2, the lower rotating shaft 10, the upper rotating shaft 11 and the pin 5 are all parallel to the feeding direction of the pipe. When the piston rod of the swing cylinder 9 is extended, it can drive the swing arm 6 to swing downward relative to the wheel die 3 and synchronously drive the clamping die 7 to swing downward close to the wheel die 3, so that the clamping die 7 and the wheel die 3 are in a relative clamping state to clamp the pipe 8. When the piston rod of the swing cylinder 9 is retracted, it can drive the swing arm 6 to swing upward relative to the wheel die 3 and synchronously drive the clamping die 7 to swing upward away from the wheel die 3 to release the pipe 8.

[0025] In this embodiment, an auxiliary clamping and pushing tube mechanism is provided on the frame 1 on the feeding side of the clamping station, which can assist in clamping and pushing the tube 8 forward during the process of bending the tube 8 by rotating the wheel mold 3 and the clamping mold 7 from the clamping station to the demolding station with the main shaft 2; the structure of the auxiliary clamping and pushing tube mechanism includes: a mold base 12 is provided on one side of the frame 1 on the feeding side of the clamping station, and an auxiliary clamping mold 13 is detachably mounted on the mold base 12, and the auxiliary clamping mold 13 is detachable by a plurality of locking bolts It is mounted on the die base 12, and a mounting bracket 14 is provided on the other side frame 1 on the feeding side of the clamping station. A first horizontal guide rail 15 perpendicular to the feeding direction of the pipe is provided on the top of the mounting bracket 14, and a slide 16 is slidably provided on the first horizontal guide rail 15, and a mounting seat 17 is provided on the slide 16. A second horizontal guide rail 18 parallel to the feeding direction of the pipe is provided on the mounting seat 17, and a guide die seat 19 is slidably provided on the second horizontal guide rail 18. A main clamping guide die 20 facing the auxiliary clamping die 13 is detachably mounted on the guide die seat 19, and the main clamping guide die 20 is detachably mounted on the guide die seat 19 by a number of locking bolts; the guide die seat 19 moves back and forth along the second horizontal guide rail 18 under the drive of the guide die seat translation mechanism; in this embodiment, the structure of the guide die seat translation mechanism includes: a tube pushing cylinder 21 provided on the mounting seat 17, the cylinder body of the tube pushing cylinder 21 is fixed to the mounting seat 17, and the piston of the tube pushing cylinder 21 The rod is connected to the guide die seat 19, and the push tube cylinder 21 can drive the guide die seat 19 to move along the second horizontal guide rail 18; the mounting seat 17 is set on the slide 16 through a positioning connection mechanism, and the main clamping guide die 20 can adjust the distance between it and the auxiliary clamping backing die 13 through the positioning connection mechanism. The slide 16 is connected to the slide translation mechanism, and the slide translation mechanism can drive the slide 16 to move along the first horizontal guide rail 15 to make the main clamping guide die 20 approach or move away from the auxiliary clamping backing die 13;

[0026] In this embodiment, the structure of the slide translation mechanism includes: a first rack 22 parallel to the first horizontal guide rail 15 is provided on the lower surface of the slide 16, a driving gear 23 meshing with the first rack 22 is supported on the mounting bracket 14 below the slide 16, a driving rack 24 meshing with the driving gear 23 is provided below the driving gear 23, the driving rack 24 is connected to the piston rod of the horizontally placed clamping cylinder 25, the cylinder body of the clamping cylinder 25 is fixedly mounted on the mounting bracket 14, and the clamping cylinder When the piston rod 25 is extended or retracted, it can drive the driving rack 24 to translate and drive the driving gear 23 to rotate. When the driving gear 23 rotates, it can drive the slide 16 to move along the first horizontal guide rail 15 through the first rack 22, so that the main clamping guide die 20 is close to or away from the auxiliary clamping mold 13. The above-mentioned slide translation mechanism has a simple structure and stable operation. This slide translation mechanism replaces the traditional slide translation mechanism that adopts an inclined clamping cylinder and a connecting rod structure, which is conducive to reducing the installation height of the slide and the main clamping guide die.

[0027] In this embodiment, the structure of the positioning connection mechanism includes: an upper positioning rack 26 fixedly mounted on the upper surface of the slide 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, the upper positioning rack 26 meshing with the lower positioning rack 27, the mounting seat 17 is positioned on the slide 16 by downwardly engaging the lower positioning rack 27 with the upper positioning rack 26, and the mounting seat 17 can be positioned on the slide 16 at different positions along the vertical pipe feeding direction through the cooperation of the lower positioning rack 27 and the upper positioning rack 26, synchronously adjusting the distance between the main clamping guide die 20 and the auxiliary clamping backing die 13; in this embodiment, a roller 28 for supporting the driving rack 24 is provided on the mounting bracket 14 below the driving rack 24, and the roller 28 can make the driving rack 24 move more smoothly, thereby improving the stability of the equipment;

[0028] Before bending the tube, first adjust the position of the mounting seat 17 on the slide 16 so that the distance between the main clamping guide die 20 and the auxiliary clamping backing die 13 when the molds are closed is adapted to the tube to be bent; then place one end of the tube 8 to be bent in the mandrel feeding mechanism, and the other end is placed forward between the main clamping guide die 20 and the auxiliary clamping backing die 13 in the auxiliary clamping tube pushing mechanism and between the wheel die 3 and the clamping die 7 of the tube bending mechanism;

[0029] During operation, the piston rod of the swing cylinder 9 is first extended, driving the swing arm 6 to swing downward relative to the wheel die 3, and synchronously driving the clamping die 7 to swing downward close to the wheel die 3, so that the clamping die 7 and the wheel die 3 are relatively clamped to clamp the pipe 8. At the same time, the piston rod of the clamping cylinder 25 is retracted, driving the driving rack 24 to move horizontally and driving the driving gear 23 to rotate. When the driving gear 23 rotates, it drives the slide 16 along the first horizontal guide rail 15 to move close to the auxiliary clamping mold 13 through the first rack 22, and synchronously drives the mounting seat 17 equipped with the main clamping guide mold 20 to move close to the auxiliary clamping mold 13 until the main clamping guide mold 20 and the auxiliary clamping mold 13 clamp the pipe 8 to be bent.

[0030] Then, the spindle drive mechanism drives the spindle 2 to rotate, and synchronously drives the wheel die 3 and the clamping die 7 to rotate from the clamping station to the demolding station, so that the wheel die 3 and the clamping die 7 bend the pipe to be bent. In the process of the wheel die 3 and the clamping die 7 bending the pipe to be bent, the pipe pushing cylinder 21 pushes the main clamping guide die 20 to the clamping station through the guide die seat 19, and synchronously pushes the pipe to be bent forward.

[0031] After the pipe is bent and formed, the piston rod of the swing cylinder 9 is retracted, driving the swing arm 6 to swing upward relative to the wheel die 3 and synchronously driving the clamping die 7 to swing upward and away from the wheel die 3 to release the pipe 8; then the main shaft drive mechanism drives the main shaft 2 to rotate in the opposite direction, driving the wheel die 3 and the clamping die 7 to rotate and reset from the demolding station to the clamping station; at the same time, the piston rod of the clamping cylinder 25 is extended, and the driving rack 24 drives the driving gear 23 to rotate in the opposite direction. When the driving gear 23 rotates in the opposite direction, it drives the slide 16 along the first horizontal guide rail 15 to move away from the auxiliary clamping die 13 through the first rack 22, and synchronously drives the mounting seat 17 equipped with the main clamping guide die 20 to move in the direction away from the auxiliary clamping die 13 until the main clamping guide die 20 and the auxiliary clamping die 13 release the pipe 8 to be bent, waiting for the next pipe bending operation.

[0032] The advantages of the present invention are: (1) the pipe bending mechanism composed of a mounting frame, a swing arm, a swing arm driving mechanism and a clamping die installed on the top of the wheel die replaces the traditional pipe bending mechanism composed of a pipe bending arm, a slider, a clamping die, a hydraulic cylinder and a set of connecting rod mechanisms installed below the wheel die. Since the pipe bending arm is omitted, the installation height of the wheel die on the main shaft can be reduced, and the installation center height of the wheel die on the main shaft can be reduced to 1.5 meters, that is, the height of the pipe processing plane formed by the wheel die and the clamping die is generally 1.5 meters. In this way, when bending pipes, there is no pipe bending arm rotating back and forth, and workers can observe the front and rear bending conditions at any time without any installation. The pipe is easy to operate and can be bent by standing on the ground without any hidden dangers. (2) Since the clamping die is clamped by swinging down close to the wheel die, when a pipe with a larger diameter needs to be clamped and bent, it is only necessary to replace the wheel die and the clamping die separately, and lift the mounting base with the main clamping guide die from the slide and move it away from the auxiliary clamping die until the position of the main clamping guide die can be adapted to the auxiliary clamping die to clamp the pipe of the new diameter. Then, the lower positioning rack is engaged with the upper positioning rack to position the pipe on the slide, so that the auxiliary clamp can push the pipe. The mechanism can clamp and bend pipes of larger sizes; there is no need to enlarge the slider, replace the wheel mold, the entire set of bending arm clamping mold structure, and the entire set of auxiliary clamping and pushing pipe mechanisms at the same time, so that the bending mechanism and the auxiliary clamping and pushing pipe mechanism can clamp and bend pipes of larger diameters, which greatly reduces the cost of use for the enterprise; (3) Before loading, it is only necessary to remove the mounting frame equipped with the swing arm, the swing arm driving mechanism and the clamping mold from the wheel mold, and then install the mounting frame equipped with the swing arm, the swing arm driving mechanism and the clamping mold on the wheel mold after arriving at the destination. There is no need to disassemble and install the wheel mold before loading and after unloading, which is convenient for disassembly and assembly, saving time and effort; (4) On the one hand, the bending arm structure is omitted in the bending mechanism. , which reduces the overall installation height of the pipe bending mechanism. At the same time, the main clamping and guiding die driving structure in the auxiliary clamping and pushing pipe mechanism, which is matched with the gear rack and the horizontal clamping cylinder, replaces the traditional main clamping and guiding die driving structure composed of a slider, a clamping die, a hydraulic cylinder and a set of connecting rod mechanisms, thereby reducing the overall installation height of the auxiliary clamping and pushing pipe mechanism, thereby reducing the overall installation height of the pipe bending machine as a whole; on the other hand, before loading, the width of the auxiliary clamping and pushing pipe mechanism can be shortened by lifting the mounting seat with the main clamping and guiding die from the slide and moving it in the direction close to the auxiliary clamping backing die, thereby shortening the overall width of the pipe bending machine; due to the reduction in the overall height and width of the pipe bending machine, the requirements for the transport vehicle during transportation are greatly reduced.

[0033] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any other form. Any modification or equivalent change made according to the technical essence of the present invention shall still fall within the scope of protection required by the present invention.

Claims

1. A pipe bending mechanism in a large pipe bending machine, comprising: The cam is fixed to the top of the wheel mold, and the mounting bracket and the swing arm are detachably mounted on the top of the wheel mold. The mounting bracket can be detachably mounted on the top of the wheel mold, and the swing arm is hingedly connected to the mounting bracket by a pin shaft so as to swing up and down relative to the wheel mold. A clamping die that can adapt to the wheel mold for clamping the pipe is fixed at the lower end of the swing arm. The swing arm is connected to the swing driving mechanism. The swing driving mechanism can drive the swing arm to swing downward relative to the wheel mold when the clamping die and the wheel mold rotate synchronously with the main shaft and pass through the clamping station, and synchronously drive the clamping die to swing downward close to the wheel mold so that the clamping die and the wheel mold are in a relative clamping state to clamp the pipe, and can drive the swing arm to swing upward relative to the wheel mold when the clamping die and the wheel mold rotate synchronously with the main shaft and pass through the demoulding station, and synchronously drive the clamping die to swing upward away from the wheel mold to release the pipe.

2. The pipe bending mechanism in a large pipe bending machine according to claim 1, characterized in that: The structure of the swing drive mechanism includes: a swing cylinder arranged on a mounting frame, the cylinder body of the swing cylinder is hinged to the mounting frame through a lower rotating shaft, and the piston rod of the swing cylinder is hinged to the upper end of the swing arm through an upper rotating shaft; the lower rotating shaft and the upper rotating shaft are both parallel to the pin shaft, and when the wheel mold and the clamping mold rotate to the clamping mold station 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 pipe bending mechanism in a large pipe bender according to claim 1, characterized in that: An auxiliary clamping and pushing tube mechanism is provided on the feeding side of the clamping station, which can assist in clamping and pushing the tube forward in the process of bending the tube when the wheel mold and the clamping mold rotate from the clamping station to the demoulding station along with the main shaft; the structure of the auxiliary clamping and pushing tube mechanism comprises: a backing mold seat is provided on one side frame at the feeding side of the clamping station, an auxiliary clamping backing mold is detachably installed on the backing mold seat, a mounting bracket is provided on the other side frame at the feeding side of the clamping station, a first horizontal guide rail perpendicular to the feeding direction of the tube is provided on the top of the mounting bracket, a slide seat is slidably provided on the first horizontal guide rail, and a mounting bracket is provided on the slide seat, A second horizontal guide rail parallel to the feeding direction of the pipe is provided on the mounting seat, and a guide die seat is slidably provided on the second horizontal guide rail. A main clamping guide die facing the auxiliary clamping mold is detachably mounted on the guide die seat, and the guide die seat moves back and forth along the second horizontal guide rail under the drive of the guide die seat translation mechanism; the mounting seat is set on the slide through a positioning connection mechanism, and the main clamping guide die can adjust the distance between it and the auxiliary clamping mold through the positioning connection mechanism, and the slide is connected to the slide translation mechanism, and the slide translation mechanism can drive the slide to move along the first horizontal guide rail to make the main clamping guide die approach or move away from the auxiliary clamping mold.

4. The pipe bending mechanism in a large pipe bender according to claim 3, characterized in that: The structure of the slide translation mechanism includes: a first rack parallel to the first horizontal guide rail is provided on the lower surface of the slide, a driving gear meshing with the first rack is supported on the mounting bracket below the slide, a driving rack meshing with the driving gear is provided below the driving gear, the driving rack is connected to the piston rod of the horizontally placed clamping cylinder, the cylinder body of the clamping cylinder is fixed on the mounting bracket, and when the piston rod of the clamping cylinder is extended or retracted, it can drive the driving rack to translate and drive the driving gear to rotate, and when the driving gear rotates, it can drive the slide to move along the first horizontal guide rail through the first rack, so that the main clamping guide mold is close to or away from the auxiliary clamping mold.

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

6. The pipe bending mechanism in a large pipe bender according to claim 3, characterized in that: The structure of the positioning connection mechanism includes: an upper positioning rack fixedly mounted on the upper surface of the slide and parallel to the first horizontal guide rail, and a lower positioning rack fixedly mounted on the lower surface of the mounting seat and parallel to the first horizontal guide rail, the upper positioning rack is meshed with the lower positioning rack, and the mounting seat is positioned on the slide by downwardly engaging the lower positioning rack with the upper positioning rack, and the mounting seat can be positioned at different positions on the slide along the vertical pipe feeding direction by cooperating with the lower positioning rack and the upper positioning rack, and the distance between the main clamping guide die and the auxiliary clamping backing die is synchronously adjusted.

7. The pipe bending mechanism in a large pipe bender according to claim 4, characterized in that: A supporting roller for supporting the driving rack is provided on the mounting bracket below the driving rack.

8. The pipe bending mechanism in a large pipe bender according to claim 7, characterized in that: The auxiliary clamping mold is detachably mounted on the mold base through several locking bolts, the main clamping guide mold is detachably mounted on the guide mold base through several locking bolts, and the mounting frame is detachably mounted on the top of the wheel mold through several locking bolts.

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