Single-head left-right pipe bending machine

Abstract

The utility model discloses a single-machine-head left-right pipe bending machine which comprises a machine head installation base and a mold splitting left-right bending machine head. The mold splitting left-right bending machine head comprises a machine head seat, a mold splitting part and a machine head part. The machine head component comprises a base, a pipe bending servo motor and a pipe bending planetary reducer are arranged on the base, a pipe bending main gear is arranged on an output shaft of the planetary reducer, a hollow pipe bending main shaft is rotationally arranged in the base, a lower rotating die shaft is rotationally arranged in the hollow pipe bending main shaft, and a lower die is installed on the upper portion of the lower rotating die shaft. The pipe bending auxiliary gear sleeves the periphery of the hollow pipe bending main shaft; the hollow pipe bending main shaft is provided with a pipe bending arm assembly with a movable clamping module which can be switched relative to the front-back position of the wheel die, the base is provided with a lead screw, the fixed seat is provided with a lead screw servo motor and a lead screw planetary reducer which are connected with each other, and an output shaft of the lead screw planetary reducer is connected with the end part of the lead screw through a coupling; the carriage is movably installed on the base through a guide rail parallel to the lead screw, and a sliding nut of the lead screw is connected to the carriage. And a sliding plate die is arranged on the carriage.

Description

Technical Field

[0001] The utility model relates to a pipe bending machine, in particular to a single-head left-right pipe bending machine. Background Art

[0002] At present, there are many kinds of left and right bending machine head structures, but the split machine heads are all single bending structures, such as described in Patent 201320779541.X, a new type of bending mold and a bending machine using the mold: "The bending machine includes two bending devices 1, and the bending devices 1 are arranged side by side between the follower support assembly and the traction device 2 along the left and right directions. Because a bending device 1 can only achieve bending in one direction, for this reason, two relatively arranged bending devices 1 are set in the bending machine to achieve the purpose of bending in two directions, so as to achieve the purpose of bending the pipe fittings both clockwise and counterclockwise in one processing process." When forming left and right bends, both need to be combined with a double head structure, resulting in a doubling of the structural size and low operating efficiency. When a single-head left and right bending machine needs to use left and right bending molds at the same time, it must be made into a two-layer mold or more. This structure will cause more interference when bending the pipe, affect the adaptability of the machine tool, and cannot be split. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a single-head left-right pipe bending machine with simple structure and low maintenance cost.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is: a single-head left-right pipe bending machine, including a bed, a core rod pull rod bracket, a follower support assembly, a feeding servo motor, a feeding reducer, and a clamping feeding assembly are arranged on the bed, a head mounting seat that moves up and down and a vertical power device that drives the head mounting seat are arranged on the bed, and a horizontally sliding split mold left-right bending head and a horizontal power device that drives the split mold left-right bending head to move are arranged on the head mounting seat;

[0005] The split left and right curved machine head includes a machine head seat, a split mold component is provided at the front upper end of the machine head seat, and a machine head component is provided at the front lower end of the machine head seat;

[0006] The mold splitting component includes a mold splitting seat connected to the machine head seat, a hollow upper mold rotating shaft is rotatably provided on the mold splitting seat, an upper mold slide seat is movably penetrated in the upper mold rotating shaft through a sliding key; an upper mold is detachably provided at the bottom end of the upper mold slide seat; an upper mold rotating power device for driving the upper mold rotating shaft to rotate is provided on the upper mold splitting gear box;

[0007] An upper mold splitting gear box is provided on the mold splitting seat, a mold splitting cylinder is installed on the top of the upper mold splitting gear box, and a piston rod of the mold splitting cylinder extends into the upper mold splitting gear box. An installation cavity with an upper opening is provided in the upper mold slide seat, a mold closing drawer joint is rotatably provided in the installation cavity, and the piston rod end of the mold splitting cylinder is connected to the mold closing drawer joint; an upper mold rotating power device for driving the upper mold rotating gear to rotate is provided on the mold splitting seat;

[0008] The head component includes a base arranged at the front of the head seat, on which a pipe bending servo motor and a pipe bending planetary reducer connected together are arranged, and a pipe bending main gear is arranged on the output shaft of the planetary reducer, a hollow pipe bending main shaft is rotatably arranged in the base, a lower rotary mold shaft is rotatably arranged in the hollow pipe bending main shaft, and the lower mold is detachably mounted on the upper part of the lower rotary mold shaft; a pipe bending sub-gear meshing with the pipe bending main gear is sleeved on the outer periphery of the hollow pipe bending main shaft; a lower rotary mold power device for driving the lower rotary mold shaft to rotate is arranged on the base; a pipe bending arm assembly with a movable clamping module that can be switched relative to the front and rear positions of the wheel mold is arranged on the hollow pipe bending main shaft, and two stop blocks that cooperate with the pipe bending arm assembly to limit the position of the pipe are arranged on the lower rotary mold shaft;

[0009] A screw rod which is arranged horizontally and perpendicular to the pipe to be processed is provided on the base, a screw servo motor and a screw planetary reducer which are connected to each other are provided on the fixed seat arranged on the base, and the output shaft of the screw planetary reducer is connected to the end of the screw rod through a coupling; a slide plate is movably installed on the base through a guide rail arranged parallel to the screw rod, and a sliding nut of the screw rod is connected to the slide plate to drive it to move; a slide plate mold is provided on the slide plate, and slide plate grooves which match the pipe to be processed are respectively provided on both sides of the slide plate mold; an auxiliary push slide plate seat which guides the slide plate mold is provided on the slide plate; an ejection cylinder which is parallel to the movement direction of the slide plate mold is provided on the slide plate, and the piston rod end of the ejection cylinder is connected to the slide plate mold.

[0010] The camming cylinder is an airtight member which is adapted to move relative to the cylinder and to engage with the cylinder to move the cylinder in a direction parallel to the axis of the cylinder.

[0011] As a preferred solution, the lower rotary mold power device includes a lower rotary mold gear box arranged at the lower part of the base, the lower rotary mold gear is installed on the lower part of the lower rotary mold shaft passing through the hollow bending pipe main shaft, and the lower rotary mold gear box is provided with a lower rotary mold planetary reducer and a lower rotary mold servo motor connected together. The output shaft of the lower rotary mold planetary reducer is connected to the lower rotary mold pinion arranged in the lower rotary mold gear box, and the lower rotary mold gear is meshed with the lower rotary mold pinion.

[0012] As a preferred solution, the upper mold power device includes an upper mold large gear arranged on the outer periphery of the upper mold shaft; an upper mold servo motor and an upper mold planetary reducer connected to each other and arranged on the upper mold splitting gear box, and the upper mold planetary reducer is provided with an upper mold small gear meshing with the upper mold large gear.

[0013] The beneficial effects of the utility model are:

[0014] This equipment adopts a brand-new mold-parting left and right bending machine head structure design, and adopts an active clamping module that can switch the position relative to the wheel mold. After the active clamping module that can switch the position relative to the wheel mold is rotated to the other side, the deviation distance from the lower wheel mold position through position switching is just enough for the auxiliary push device to move to the center corresponding to the lower wheel mold during processing, and there will be no interference with other parts, so that it can complete the clamping function well on both sides, and its clamping effect is reliable, so that the single machine head of this equipment can reliably realize the left and right bending function, and can also complete the mold-parting action, and the overall structure is compact, the work is efficient, and the equipment cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional structural schematic diagram of the utility model.

[0016] Figure 2 This is the overall structure diagram of the machine head.

[0017] Figure 3 It is a cross-sectional view of the mold separation component.

[0018] Figure 4 This is a cross-sectional view of the nose component.

[0019] Figure 5 It is a top view of the nose (left curved form).

[0020] Figure 6 It is a top view of the nose (right curved form).

[0021] Figure 7 It is a three-dimensional structural schematic diagram of the bending arm assembly part of the utility model.

[0022] Figure 8 This is an exploded view of the structure of the curved pipe arm assembly in the utility model.

[0023] Fig. 9 It is a three-dimensional structural schematic diagram of the movable clamping mold and other parts in the utility model.

[0024] Fig.10 for Fig. 9 Top sectional view (right bending state).

[0025] Fig.11 for Fig. 9 Top sectional view (left-bending state).

[0026] In the figure: 1 bed, 2 core rod tie rod bracket, 3 follower support assembly, 4 feeding servo motor, 5 feeding reducer, 6 clamping feeding assembly; 7 head mounting seat, 8 vertical power device, 9 split mold left and right bending head, 10 horizontal power device;

[0027] 11 head base, 12 split mold parts, 13 head parts, 14 split mold base, 15 upper mold pinion, 16 upper mold planetary reducer, 17 upper mold servo motor, 18 split mold cylinder, 19 upper mold gearbox, 20 upper mold large gear, 21 mold clamping cylinder joint, 22 upper mold shaft, 23 upper mold slide, 24 upper mold, 25 lower mold, 26 lower mold shaft, 27 hollow pipe bending spindle, 28 pipe bending sub-gear, 29 lower mold large gear Wheel, 30 lower mold rotation gearbox, 31 pipe bending servo motor, 32 pipe bending planetary reducer, 33 pipe bending main gear, 34 screw support seat, 35 screw, 36 drag plate, 37 anti-rotation block; 38 slide plate mold, 39 pipe bending arm assembly, 40 screw servo motor, 41 planetary reducer, 42 fixed seat, 43 ejection cylinder, 44 auxiliary push slide seat, 45 lower mold rotation pinion, 46 lower mold rotation planetary reducer, 47 lower mold rotation servo motor;

[0028] 48 clamping cylinder, 49 connecting seat, 50 slide rail, 51 clamping die seat, 52 clamping block, 53 switching cylinder, 54 guide block, 55 guide pin, 56 rolling bearing, 57 bending pipe clamping module, 58 limit block, 59 adjusting tail stock, 60 adjusting screw, 61 bending pipe cantilever, 62 movable clamping die, 63 clamping seat. DETAILED DESCRIPTION

[0029] The specific implementation scheme of the utility model is described in detail below in conjunction with the accompanying drawings.

[0030] like Figure 1-5 As shown, a single-head left-right pipe bending machine includes a bed 1, on which a core rod pull rod bracket 2, a follower support assembly 3, a feeding servo motor 4, a feeding reducer 5, and a clamping feeding assembly 6 are arranged. The bed 1 is provided with a head mounting seat 7 that moves up and down and a vertical power device 8 that drives the head mounting seat 7. The head mounting seat 7 is provided with a horizontally sliding split mold left-right bending head 9 and a horizontal power device 10 that drives the split mold left-right bending head 9 to move.

[0031] The split left and right curved die head 9 comprises a die head seat 11, a split die component 12 is provided at the front upper end of the die head seat 11; a die head component 13 is provided at the front lower end of the die head seat 11;

[0032] The mold splitting component 12 includes a mold splitting seat 14 connected to the head seat 11, a hollow upper mold rotating shaft 22 is rotatably provided on the mold splitting seat 14 through a pair of bearings, an upper mold slide 23 is movably inserted in the upper mold rotating shaft 22 through a sliding key; an upper mold 24 is detachably provided at the bottom end of the upper mold slide 23; an upper mold rotating power device for driving the upper mold rotating shaft 22 to rotate is provided on the upper mold splitting gear box 19;

[0033] The mold splitting seat 14 is provided with an upper mold splitting gear box 19, a mold splitting cylinder 18 is installed on the top of the upper mold splitting gear box 19, and the piston rod of the mold splitting cylinder 18 extends into the upper mold splitting gear box 19, and an installation cavity with an upper opening is provided in the upper mold slide 23, a mold closing drawer joint is rotatably provided in the installation cavity, and the piston rod end of the mold splitting cylinder 18 is connected to the mold closing drawer joint; the mold splitting seat 14 is provided with an upper mold rotating power device for driving the upper mold rotating gear 20 to rotate;

[0034] The upper mold rotation power device includes an upper mold rotation gear 20 arranged on the outer periphery of the upper mold rotation shaft 22; an upper mold rotation servo motor 17 and an upper mold rotation planetary reducer 16 connected to each other and arranged on the upper mold splitting gear box 19, and the upper mold rotation planetary reducer 16 is provided with an upper mold rotation pinion 15 meshing with the upper mold rotation gear 20.

[0035] The head component 13 includes a base arranged at the front of the head seat 11, on which a pipe bending servo motor 31 and a pipe bending planetary reducer 32 connected together are arranged, and a pipe bending main gear 33 is arranged on the output shaft of the pipe bending planetary reducer 32, and the part of the output shaft of the pipe bending planetary reducer 32 above the pipe bending main gear 33 is connected to the bearing arranged in the base; a hollow pipe bending main shaft 27 is rotatably arranged in the base, a lower rotary mold shaft 26 is rotatably arranged in the hollow pipe bending main shaft 27, and a lower mold 25 is installed on the upper part of the lower rotary mold shaft 26; the lower mold 25 is connected to the upper part of the lower rotary mold shaft 26 by a key; a positioning boss is arranged on the lower mold 25, and a positioning groove matching the positioning boss is arranged on the lower rotary mold shaft 26. The pipe bending sub-gear 28 meshing with the pipe bending main gear 33 is sleeved on the outer periphery of the hollow pipe bending main shaft 27; a lower rotary mold power device driving the lower rotary mold shaft 26 to rotate is arranged on the base;

[0036] The lower rotary mold power device includes a lower rotary mold gear box 30 arranged at the lower part of the base, and the lower rotary mold gear is installed on the lower part of the lower rotary mold shaft 26 passing through the hollow curved pipe main shaft 27. The lower rotary mold gear box 30 is provided with a lower rotary mold planetary reducer 46 and a lower rotary mold servo motor 47 connected together. The output shaft of the lower rotary mold planetary reducer 46 is connected to the lower rotary mold pinion 45 arranged in the lower rotary mold gear box 30, and the lower rotary mold gear is meshed with the lower rotary mold pinion 45.

[0037] The hollow bending main shaft 27 is provided with a bending arm assembly 39 with a movable clamping die 62 that can be switched relative to the front and rear positions of the wheel die, and the lower rotary die shaft 26 is provided with two stop blocks 37 that cooperate with the bending arm assembly 39 to limit the position of the pipe.

[0038] The bending arm assembly 39 includes a bending cantilever 61 mounted on a hollow bending spindle 27, and the movable clamping die 62 includes a clamping seat 63 slidably mounted on the bending cantilever 61 and a clamping cylinder 48 driving the clamping seat 63 to move toward or away from the lower wheel die. The clamping seat 63 is provided with a connecting seat 49, and the connecting seat 49 is provided with an inverted dovetail slide rail 50 arranged perpendicular to the piston rod of the clamping cylinder 48. The slide rail 50 is slidably provided with a clamping die seat 51, and the clamping die seat 51 is provided with a sliding groove, one side of the sliding groove is an inclined surface and the other side is a vertical surface, and a clamping block 52 is detachably provided on the sliding groove close to the vertical surface, and the clamping block 52 is provided with an inclined surface matching the inverted dovetail slide rail 50. The clamping die seat 51 is provided with a switching cylinder 53, and the connecting seat 49 is provided with an upwardly opening mounting cavity, and a guide block 54 is movably provided in the mounting cavity. The guide block 54 is connected to the piston rod end of the switching cylinder 53 that penetrates the mounting cavity, and a guide groove is provided on the guide block 54. The angle between the guide groove and the motion trajectory of the guide block 54 is an acute angle. A guide pin 55 is provided in the mounting cavity, and the upper part of the guide pin 55 is penetrated in the guide groove. The guide pin 55 is provided with a rolling bearing 56 that matches the groove wall of the guide groove. The clamping die seat 51 is provided with a bending pipe clamping module 57 that slides perpendicularly to the slide rail 50, and the upper part of the bending pipe clamping module 57 is provided with a limit block 58 to prevent the pipe to be processed from falling out. The clamping die seat 51 is provided with an adjusting tailstock 59, and an adjusting screw 60 for pushing the bending pipe clamping module 57 is provided through a threaded hole on the adjusting tailstock 59.

[0039] A screw rod 35 is provided on the base through a screw rod 35 support seat 34, which is perpendicular to the pipe to be processed and arranged horizontally. A screw servo motor 40 and a screw planetary reducer 41 connected to each other are provided on a fixed seat 42 arranged on the base. The output shaft of the screw planetary reducer 41 is connected to the end of the screw rod 35 through a coupling; the carriage 36 is movably installed on the base through a guide rail arranged parallel to the screw rod 35, and the sliding nut of the screw rod 35 is connected to the carriage 36 to drive it to move; a skateboard mold 38 is provided on the carriage 36, and sliding mold grooves matching the pipe to be processed are respectively provided on both sides of the skateboard mold 38; an auxiliary push skateboard seat 44 for guiding the skateboard mold 38 is provided on the carriage 36; an ejection cylinder 43 parallel to the movement direction of the skateboard mold 38 is provided on the carriage 36, and the piston rod end of the ejection cylinder 43 is connected to the skateboard mold 38.

[0040] Working process:

[0041] After the pipe is inserted into the mandrel and onto the mandrel rod support, the feeding assembly is clamped to clamp the pipe. If the first bend is a right bend, the split mold left and right bend machine heads 9 and the pipe bending arm assembly 39 are switched to a right bend, and at the same time, the horizontal power device drives the split mold left and right bend machine heads 9 to place the pipe on the left side of the pipe bending mold, and then the vertical power device raises the split mold left and right bend machine heads 9 to the working position, and the right bend process can be performed.

[0042] Then the upper mold servo motor 17 provides power, and drives the upper mold gear 20 through the upper mold pinion 15 on the upper mold planetary reducer 16. The upper mold gear 20 transmits the torque to the upper mold shaft 22 to drive the upper mold slide 23. Finally, the torque of the upper mold servo motor 17 is transmitted to the upper mold 24; the split mold cylinder 18 drives the upper mold slide 23 to move axially through the clamping cylinder joint 21 and the bearing; the movement of the entire split mold component 12 is ultimately the rotation and axial movement of the upper mold 24.

[0043] The bending pipe planetary reducer 32 drives the bending pipe main gear 33, and the transmission group formed with the bending pipe sub-gear 28 transmits power to the hollow bending pipe main shaft 27.

[0044] The lower rotary mold servo motor 47 provides power, and drives the lower rotary mold large gear 29 through the lower rotary mold small gear 45 on the lower rotary mold planetary reducer 46. The lower rotary mold large gear 29 transmits the torque to the lower rotary mold shaft 26, and finally transmits the torque to the lower mold 25; the bending servo motor 31 transmits the torque to the bending main gear 33 through the bending planetary reducer 32, and the gear set transmits the torque to the hollow bending main shaft 27, and the hollow bending main shaft 27 drives the bending arm to rotate.

[0045] The screw servo motor 40 drives the screw 35 to rotate through the planetary gear reducer, thereby driving the carriage 36 to move axially. Figure 6 position, and the movable clamping die 62 is switched to the right bending state, and the lower die 25 and the upper die 24 are rotated to Figure 6 The ejection cylinder 43 is then actuated to push the slide plate mold 38 to the center of the bending pipe. The mold separation cylinder 18 is pressed down to close the mold. The bending arm assembly 39 is clamped and stuck with the anti-rotation block to form a whole. The bending arm assembly rotates, and the upper mold 24 and the lower mold 25 also rotate at the same time to form a bending action.

[0046] When the pipe is bent, if it is necessary to switch to the left bending form, the left and right bending machine heads 9 of the split mold are lowered, and then the switch is performed. Figure 5 As shown, the movable clamping mold 62 blocks need to be switched to the left bending state at the same time.

[0047] The switching process of the movable clamping die 62 is as follows: when the pipe bender is in the right bending state, Fig.10In the process, the piston rod of the switching cylinder 53 is retracted, driving the switching guide block 54 to retreat. Since the guide pin 55 is in a fixed position, the guide block 54 moves to the right, and the guide block 54 is in a sliding fit in the slide groove of the clamping die seat 51, driving the clamping die seat 51 to move right at the same time, and the bending pipe clamping module 57 also moves right accordingly, forming a right bend. The same is true for the left bend.

[0048] The above-mentioned embodiments are only illustrative of the principles and effects of the invention, as well as some embodiments of its application, and are not intended to limit the invention. It should be pointed out that a person skilled in the art can make several modifications and improvements without departing from the inventive concept of the invention, and all of these belong to the protection scope of the invention.

Claims

1. A single-head left-right pipe bending machine, comprising a bed, a core rod pull rod bracket, a follower support assembly, a feeding servo motor, a feeding reducer, and a clamping feeding assembly are arranged on the bed, a head mounting seat for up and down movement and a vertical power device for driving the head mounting seat are arranged on the bed, and a horizontally sliding split mold left-right bending head and a horizontal power device for driving the split mold left-right bending head to move are arranged on the head mounting seat; The split left and right curved machine head includes a machine head seat, a split mold component is provided at the front upper end of the machine head seat, and a machine head component is provided at the front lower end of the machine head seat; The mold splitting component includes a mold splitting seat connected to the machine head seat, a hollow upper mold rotating shaft is rotatably provided on the mold splitting seat, an upper mold slide seat is movably penetrated in the upper mold rotating shaft through a sliding key; an upper mold is detachably provided at the bottom end of the upper mold slide seat; an upper mold rotating power device for driving the upper mold rotating shaft to rotate is provided on the upper mold splitting gear box; Features: The mold splitting seat is provided with an upper mold splitting gear box, the mold splitting cylinder is installed on the top of the upper mold splitting gear box and the piston rod of the mold splitting cylinder extends into the upper mold splitting gear box, the upper mold slide is provided with a mounting cavity with an upper opening, a mold closing drawer joint is rotatably provided in the mounting cavity, and the piston rod end of the mold splitting cylinder is connected to the mold closing drawer joint; the mold splitting seat is provided with an upper mold rotating power device for driving the upper mold rotating gear to rotate; The head component includes a base arranged at the front of the head seat, on which a pipe bending servo motor and a pipe bending planetary reducer connected together are arranged, and a pipe bending main gear is arranged on the output shaft of the planetary reducer, a hollow pipe bending main shaft is rotatably arranged in the base, a lower rotary mold shaft is rotatably arranged in the hollow pipe bending main shaft, and the lower mold is detachably mounted on the upper part of the lower rotary mold shaft; a pipe bending sub-gear meshing with the pipe bending main gear is sleeved on the outer periphery of the hollow pipe bending main shaft; a lower rotary mold power device for driving the lower rotary mold shaft to rotate is arranged on the base; a pipe bending arm assembly with a movable clamping module that can be switched relative to the front and rear positions of the wheel mold is arranged on the hollow pipe bending main shaft, and two stop blocks that cooperate with the pipe bending arm assembly to limit the position of the pipe are arranged on the lower rotary mold shaft; A screw rod which is arranged horizontally and perpendicular to the pipe to be processed is provided on the base, a screw servo motor and a screw planetary reducer which are connected to each other are provided on the fixed seat arranged on the base, and the output shaft of the screw planetary reducer is connected to the end of the screw rod through a coupling; the carriage is movably installed on the base through a guide rail arranged parallel to the screw rod, and the sliding nut of the screw rod is connected to the carriage to drive it to move; a skateboard mold is detachably provided on the carriage, and sliding mold grooves which match the pipe to be processed are respectively provided on both sides of the skateboard mold; an auxiliary push skateboard seat which guides the skateboard mold is provided on the carriage; an ejection cylinder which is parallel to the movement direction of the skateboard mold is provided on the carriage, and the piston rod end of the ejection cylinder is connected to the skateboard mold.

2. A single-head left-right pipe bending machine as claimed in claim 1, characterized in that: The cam assembly comprises a cam cantilever arm sleeved on a hollow cam spindle, and the movable clamping module comprises a clamping seat slidably arranged on the cam cantilever arm and a clamping cylinder driving the clamping seat to move towards or away from the lower wheel mold, and a connecting seat is provided on the clamping seat, and a sliding rail is arranged perpendicular to the piston rod of the clamping cylinder, and a clamping seat is slidably provided on the connecting seat, and a switching cylinder is provided on the clamping seat, and an installation cavity opening upward is provided in the connecting seat, and a guide block is movably provided in the installation cavity, and the guide block is connected to the piston rod end of the switching cylinder that penetrates into the installation cavity, and a guide groove is provided on the guide block, and the angle between the guide groove and the movement trajectory of the guide block is an acute angle, and a guide pin is provided in the installation cavity, and the upper part of the guide pin is penetrated in the guide groove, and a cam clamping module sliding perpendicular to the slide rail is provided on the clamping seat, and an adjusting tail stock is provided on the clamping seat, and an adjusting screw for tightening the cam clamping module is provided through a threaded hole on the adjusting tail stock.

3. A single-head left-right pipe bending machine as claimed in claim 1, characterized in that: The lower rotary mold power device includes a lower rotary mold gear box arranged at the lower part of the base, the lower rotary mold gear is installed on the lower part of the lower rotary mold shaft passing through the hollow bending pipe main shaft, the lower rotary mold gear box is provided with a lower rotary mold planetary reducer and a lower rotary mold servo motor connected together, the output shaft of the lower rotary mold planetary reducer is connected to the lower rotary mold pinion arranged in the lower rotary mold gear box, and the lower rotary mold gear is meshed with the lower rotary mold pinion.

4. A single-head left-right pipe bending machine as claimed in claim 1, characterized in that: The upper mold rotation power device includes an upper mold rotation large gear arranged on the outer periphery of the upper mold rotation shaft; an upper mold rotation servo motor and an upper mold rotation planetary reducer connected to each other and arranged on the upper mold splitting gear box, and the upper mold rotation planetary reducer is provided with an upper mold rotation small gear meshing with the upper mold rotation large gear.

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