CN211679456U

CN211679456U - Pipe bending mechanism and double-head pipe bending machine

Info

Publication number: CN211679456U
Application number: CN201922127853.2U
Authority: CN
Inventors: 张彩梅; 宁恒; 方敏
Original assignee: Zhongshan Norye Hardware Co ltd
Current assignee: Zhongshan Norye Hardware Co ltd
Priority date: 2019-02-26
Filing date: 2019-11-29
Publication date: 2020-10-16
Anticipated expiration: 2029-11-29
Also published as: CN110918721A

Abstract

The utility model provides a return bend mechanism and double-end bending machine relates to the technical field of machining equipment. The pipe bending mechanism comprises: the circular die is fixed on the fixed shaft and can rotate along with the fixed shaft; a rotating seat capable of rotating along the fixed shaft is arranged on the fixed shaft, a guide die and a crease-resistant die are arranged on the rotating seat, the guide die is connected with a guide die oil cylinder, a mandrel oil cylinder is also arranged on the rotating seat, and a piston rod of the mandrel oil cylinder is connected with a mandrel; the rotating seat is provided with a first driving mechanism for driving the rotating seat to rotate. The technical problem that the bent part of the pipe fitting is not smooth enough in the prior art is solved.

Description

Pipe bending mechanism and double-head pipe bending machine

Technical Field

The utility model belongs to the technical field of machining equipment technique and specifically relates to a return bend mechanism and double-end bending machine is related to.

Background

The pipe bender in the prior art mainly comprises the following parts: a manual pipe bender, a common electric pipe bender and a numerical control electric pipe bender. The manual pipe bender is a product which is manually bent, and strictly speaking, the manual pipe bender can only be a tool. The disadvantages are as follows: the labor cost is high. The common electric pipe bender is a product upgraded after being based on a manual pipe bender, and replaces manual bending. The disadvantages are as follows: the bending angle is inconvenient to adjust, and the angle error is large. The numerical control electric pipe bender is an upgraded product based on the electric pipe bender, an angle control part is upgraded, the angle is adjusted more conveniently, much time is saved invisibly, and the labor cost is saved.

However, the pipe bender in the prior art only has a round die, a guide die and a clamping die, so that the bending part of the pipe fitting is not smooth enough or is easy to wrinkle.

SUMMERY OF THE UTILITY MODEL

A first object of the utility model is to provide a pipe bending mechanism to alleviate the not smooth technical problem inadequately of the position of buckling of the pipe fitting that exists among the prior art.

Based on above-mentioned first purpose, the utility model provides a pipe bending mechanism, include: the circular die comprises a circular die and a fixed shaft, wherein the fixed shaft is arranged on the rack, and the circular die is fixed on the fixed shaft and can rotate along with the fixed shaft.

The anti-crease drawing die is characterized in that a rotary seat capable of rotating along the fixed shaft is arranged on the fixed shaft, a guide die and an anti-crease die are arranged on the rotary seat, the guide die is connected with a guide die oil cylinder, a mandrel oil cylinder is further arranged on the rotary seat, and a piston rod of the mandrel oil cylinder is connected with a mandrel.

The rotary seat is provided with a first driving mechanism for driving the rotary seat to rotate.

As a further technical scheme, a clamping oil cylinder is arranged on the rack and is matched with the clamping die to clamp the pipe fitting.

As a further technical scheme, the first driving mechanism comprises an elbow oil cylinder, and the elbow oil cylinder enables the rotary seat to rotate around the fixed shaft through the matching of a gear and a rack.

As a further technical scheme, the device further comprises a control device, and the control device is electrically connected with the guide die oil cylinder, the mandrel oil cylinder and the first driving mechanism respectively.

As a further technical scheme, the clamping device further comprises a control device, and the control device is electrically connected with the clamping oil cylinder.

As a further technical scheme, the mandrel is positioned in a cavity between the guide die and the crease-resist die and matched with the inner wall of the pipe fitting, and a boss is arranged on the outer wall of the mandrel.

As a further technical scheme, the groove of the guide die is matched with the groove of the crease-resist die, and the outer side wall of the guide die is provided with a guide groove along the length direction.

As a further technical scheme, the arc-shaped groove on the outer side of the circular die is matched with the arc-shaped groove of the clamping die to form a circular arc-shaped cavity, and the inner wall of the cavity is matched with the outer wall of the front end of the pipe fitting.

A second object of the present invention is to provide a double-head pipe bender to alleviate the technical problem of the pipe fitting of the prior art that the bending position is not smooth enough.

Based on above-mentioned second purpose, the utility model provides a double-end bending machine, including slip table and two return bend mechanism.

The two pipe bending mechanisms are symmetrically arranged on the sliding table, and the distance between the two groups of pipe bending mechanisms is adjustable.

As a further technical scheme, a groove is formed in the sliding table.

As a further technical scheme, still including taking off the pipe fitting, it includes joint portion to take off the pipe fitting, joint portion can be relative pipe fitting motion to can with the surface butt of pipe fitting, be used for making the pipe fitting after bending break away from.

As a further technical scheme, the pipe-disconnecting part comprises a first connecting part and a second connecting part and a third connecting part which respectively protrude from the first connecting part, the second connecting part and the third connecting part form a groove structure with an opening facing one side, and the clamping part is arranged on the second connecting part or the third connecting part.

As a further technical solution, the pipe removing member is fixedly connected to the clamping die.

Or the pipe-removing piece is fixedly connected to a piston rod of the clamping oil cylinder.

The utility model discloses the beneficial effect who brings does:

the utility model provides a pipe bending mechanism, include: the circular die is fixed on the fixed shaft and can rotate along with the fixed shaft; the fixed shaft is provided with a swivel base which can rotate along the fixed shaft, the swivel base is provided with a guide die and an anti-wrinkling die, the anti-wrinkling die is arranged on the swivel base, the guide die is connected with a guide die oil cylinder, the swivel base is also provided with a mandrel oil cylinder, and a piston rod of the mandrel oil cylinder is connected with a mandrel; the rotating seat is provided with a first driving mechanism for driving the rotating seat to rotate. The pipe bending mechanism provided by the utility model is additionally provided with the core rod and the anti-wrinkling die, and can effectively ensure smooth transition of a product machining position; the bent pipe is added with a core rod and an anti-wrinkling die, so that smooth and smooth bending transition can be ensured, and high-end products with high requirements can be met.

Additionally, the utility model provides a double-end bending machine with the utility model provides a return bend mechanism is the same for the advantage that prior art has, no longer gives unnecessary details here.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a pipe bending mechanism according to an embodiment of the present invention;

fig. 2 is a schematic structural view of a double-head pipe bender according to an embodiment of the present invention;

fig. 3 is a schematic structural view of the double-head pipe bender according to the embodiment of the present invention, which is provided with a pipe stripping member;

fig. 4 is a left side view of the double-headed pipe bender according to the embodiment of the present invention;

FIG. 5 is an enlarged view of a portion of FIG. 3 at A;

FIG. 6 is an enlarged view of a portion of FIG. 3 at B;

fig. 7 is a schematic structural view of the pipe stripping member shown in fig. 3.

Icon: 1-circular mould; 2, fixing a shaft; 3-transposition; 4-guiding a mold; 5-anti-wrinkling mold; 6-core rod oil cylinder; 7-a core rod; 8, clamping the oil cylinder; 9-clamping the die; 10-a bent pipe oil cylinder; 11-a guide die oil cylinder; 12-a control device; 13-a slide table; 14-a gear; 15-a rack; 16-clamping the die holder; 17-crease-resist mould fixing seat; 18-a guide groove; 19-connecting block; 20-a first mandrel segment; 21-a second mandrel segment; 22-a third mandrel segment; 23-removing the pipe fitting; 231-a first connection; 232-a second connection; 233-third connecting part.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that, as the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. appear, the indicated orientation or positional relationship thereof is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, but does not indicate or imply that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, as may be used herein, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The utility model provides a return bend mechanism and double-end bending machine, it is right to give a plurality of embodiments below the utility model provides a return bend mechanism and double-end bending machine carry out detailed description.

Example one

The first pipe bending mechanism provided in this embodiment, as shown in fig. 1 and fig. 2, includes: the circular mould comprises a circular mould 1 and a fixed shaft 2, wherein the fixed shaft 2 is arranged on a rack, and the circular mould 1 is fixed on the fixed shaft 2 and can rotate along with the fixed shaft 2; a rotary seat 3 capable of rotating along the fixed shaft 2 is arranged on the fixed shaft 2, a guide die 4 and a crease-resistant die 5 are arranged on the rotary seat 3, the guide die 4 is connected with a guide die oil cylinder 11, a mandrel oil cylinder 6 is also arranged on the rotary seat 3, and a piston rod of the mandrel oil cylinder 6 is connected with a mandrel 7; the rotary seat 3 is provided with a first driving mechanism for driving the rotary seat 3 to rotate.

It should be noted that:

1. the above-mentioned "the circular mold 1 is fixed on the fixed shaft 2, and the fixed shaft 2 is arranged on the frame", specifically, the fixed shaft 2 is fixed on the frame, that is, the circular mold 1 and the fixed shaft 2 are fixed relative to the frame.

2. The fixed shaft 2 is provided with a rotating seat 3 which can rotate along the fixed shaft 2, and the rotating seat 3 can rotate around the fixed shaft 2.

3. A first cavity for the core rod 7 to enter is reserved between the guide die 4 and the crease-resist die 5.

In one embodiment, as shown in fig. 1, the guide die 4 is positioned below the blank-holding die 5; wherein, be equipped with the semicircle groove on the guide die 4, also be equipped with the semicircle groove that the diameter is the same on the crease-resistance mould 5, guide die 4 forms the cylindric cavity (being first cavity) that can hold plug 7 with crease-resistance mould 5 cooperation.

4. The guide die 4 is connected with a piston rod of the guide die oil cylinder 11, and the guide die 4 can slide relative to the rotary seat 3 so as to ensure that the guide die 4 can be driven to be close to or far away from the crease-resistant die 5 when the piston rod of the guide die oil cylinder 11 extends out or retracts, wherein the guide die oil cylinder 11 is arranged on the rotary seat 3.

5. The mandrel oil cylinder 6 is arranged on the rotary seat 3, and when the rotary seat 3 rotates, the mandrel oil cylinder 6 and the mandrel 7 can be driven to rotate together, so that the bending action of the pipe fitting is realized.

During specific work, the first driving mechanism works to drive the rotary seat 3 to rotate, and meanwhile, the rotary seat 3 drives the guide die 4, the crease-resist die 5, the mandrel oil cylinder 6, the mandrel 7 and the guide die oil cylinder 11 to rotate together.

In the embodiment, a clamping oil cylinder 8 is arranged on the rack, and the clamping oil cylinder 8 is matched with a clamping die 9 to clamp the pipe fitting.

The clamping oil cylinder 8 is mounted on the frame, the clamping die 9 is connected to a piston rod of the clamping oil cylinder 8, and the clamping die 9 can slide relative to the frame under the driving of the clamping oil cylinder 8, so that the clamping die 9 is close to or far away from the round die 1, and the pipe fitting is clamped between the round die 1 and the clamping die 9.

It should be noted that the pipe is a hollow pipe, and the inner diameter of the pipe is slightly larger than the outer diameter of the mandrel 7.

Specifically, the circular die 1 is located above the clamping die 9, a pipe fitting is left between the clamping die and the circular die to enter the second cavity, the clamping cylinder 8 drives the clamping die 9 to move towards the direction close to the circular die 1 so as to clamp the pipe fitting, and on the contrary, the clamping cylinder 8 drives the clamping die 9 to move towards the direction far away from the circular die 1 so as to loosen the pipe fitting.

Wherein, be equipped with the semicircle groove on the circle mould 1, also be equipped with the semicircle groove that the diameter is the same on the clamping die 9, circle mould 1 forms the cylindric cavity (the second cavity) that can hold the pipe fitting with clamping die 9 cooperation.

In the embodiment, one end of the pipe passes through the second cavity between the circular die 1 and the clamping die 9 and enters the first cavity between the guide die 4 and the anti-crease die 5, and one end of the core rod 7, which is far away from the core rod oil cylinder 6, extends into the pipe, wherein the core rod 7 and the anti-crease die 5 are matched to ensure that the pipe does not deform (such as bend flat) in the bending process, so that smooth transition of a product processing position (a transition part between a straight line section and a bending section of the pipe) can be effectively ensured, and the pipe is attached to the pipe bending die at any time in the bending process (wherein the pipe bending die at the position comprises the circular die 1, the anti-crease die 5 and the clamping die 9).

In this embodiment, the first driving mechanism may have various configurations, and is not limited to the specific configuration described below.

In one embodiment, as shown in fig. 4, the first driving mechanism comprises a bent pipe cylinder 10, and the bent pipe cylinder 10 enables the rotary base 3 to rotate around the fixed shaft 2 through the cooperation of a gear 14 and a rack 15. Specifically, referring to fig. 3 and 4, the elbow cylinder 10 is mounted on the frame, a piston rod of the elbow cylinder 10 is connected to the rack 15 and can drive the rack 15 to move, since the rack 15 is meshed with the gear 14, the movement of the rack 15 will drive the gear 14 to rotate, and the gear 14 is fixedly connected to the rotary base 3, so as to drive the rotary base 3 to rotate.

It should be noted that the rotating base 3 is rotatably connected to the fixed shaft 2 through a bearing, so that the rotating base 3 can rotate around the fixed shaft 2 under the driving of the elbow cylinder 10.

In this embodiment, as shown in fig. 3, a clamping die fixing seat 16 is connected to the clamping die 9, and the clamping die fixing seat 16 is fixedly connected to a piston rod of the clamping cylinder 8. The clamping die 9 and the clamping die fixing seat 16 can be in threaded connection or clamped connection.

Referring to fig. 3, the wrinkle-proof mold 5 is connected with a wrinkle-proof mold fixing seat 17, and the wrinkle-proof mold fixing seat 17 is connected with the wrinkle-proof mold 5 through a key.

On the basis of the above embodiment, the pipe bending mechanism further includes a control device 12, and the control device 12 is electrically connected to the mandrel cylinder 6, the clamping cylinder 8, the pipe bending cylinder 10, and the die guiding cylinder 11, respectively.

It should be noted that how the control device 12 controls the cylinders (including the mandrel cylinder 6, the clamping cylinder 8, and the mold guiding cylinder 11) is well known in the art, and this embodiment does not improve it, and therefore, detailed description thereof is omitted.

Wherein the control means 12 may comprise a controller.

Specifically, the working process of the pipe bending mechanism is as follows:

placing the pipe fitting on the guide die 4 and the clamping die 9, starting the guide die oil cylinder 11 under the action of the control device 12 to enable the guide die 4 to move towards the direction close to the crease-resist die 5, and simultaneously starting the clamping oil cylinder 8 to enable the clamping die 9 to move towards the direction close to the round die 1 to clamp the pipe fitting; then starting the mandrel oil cylinder 6, wherein a piston rod of the mandrel oil cylinder 6 drives the mandrel 7 to move transversely until the mandrel 7 is inserted into the pipe fitting; and starting the pipe bending oil cylinder 10, driving the rotary seat 3 to rotate by the pipe bending oil cylinder 10, and driving the guide die 4, the crease-resist die 5, the mandrel oil cylinder 6, the mandrel 7 and the guide die oil cylinder 11 to rotate together by the rotary seat 3, so that the pipe fitting is bent.

After the bending is finished, the mandrel oil cylinder 6, the clamping oil cylinder 8 and the die guiding oil cylinder 11 can simultaneously or sequentially act in the opposite directions, and the bent pipe fitting is taken out; in addition, the pipe bending oil cylinder 10 works to enable the parts such as the rotary seat 3 and the like to return to the initial position for the next pipe bending.

In this embodiment, as shown in fig. 3 and 5, the outer side wall of the guide die 4 has a guide groove 18 along the length direction.

Specifically, referring to fig. 5, a piston rod of the guide mold cylinder 11 is connected to a connecting block 19, and the connecting block 19 is slidably connected to the guide mold 4 through a guide groove 18; the structure has the effect that in the pipe bending process, the guide die 4 can slide relative to the guide die oil cylinder 11, so that the smooth implementation of the pipe bending work is ensured.

In the alternative of this embodiment, the mandrel 7 is located in the cavity between the guide die 4 and the crease-resist die 5, and is matched with the inner wall of the pipe, and the outer wall of the mandrel 7 is provided with a boss.

In this embodiment, the mandrel 7 may be a structural member.

Specifically, referring to fig. 3 and 6, the mandrel 7 includes a first mandrel segment 20, a second mandrel segment 21 and a third mandrel segment 22, wherein the first mandrel segment 20 and the second mandrel segment 21 are connected by a screw thread, and the second mandrel segment 21 and the third mandrel segment 22 are connected by a pin.

With reference to fig. 6, the first mandrel segment 20 is provided with an external thread, the second mandrel segment 21 is provided with an internal thread, and the internal thread and the external thread are connected to form an annular boss (i.e., the position indicated by 21 in fig. 6) on the mandrel 7, wherein the outer diameter of the annular boss is larger than that of the first mandrel segment 20 and the third mandrel segment 22.

The utility model discloses still have following advantage: 1. in this embodiment, a wrinkle-proof die 5 is added, such as: the phi 32 tube can bend R40, the phi 38 tube can bend R48, and the tube bending machine without the crease-resist die 5 can not realize. Specifically, the common equipment is not provided with the anti-wrinkling die 5 and the core rod 7, so that the pipe fitting is easy to wrinkle and flatten due to untight clamping in the bending process, and the pipe fitting cannot be subjected to too small bending limit R.

Example two

The double-head pipe bending machine provided by the second embodiment of the present invention, as shown in fig. 2 and 3, includes a sliding table 13 and a pipe bending mechanism provided by the first embodiment; the two groups of pipe bending mechanisms are symmetrically arranged on the sliding table 13, and the distance between the two groups of pipe bending mechanisms is adjustable.

It should be noted that the above-mentioned "symmetrical arrangement" means that the two sets of pipe bending mechanisms are symmetrically arranged with respect to the central position of the sliding table 13 in the length direction as a symmetrical reference, as shown in fig. 3.

It should be further noted that the distance between the two sets of pipe bending mechanisms is adjustable by the two sets of pipe bending mechanisms being able to slide on the sliding table 13, wherein the sliding direction of the pipe bending mechanisms is consistent with the length direction of the sliding table 13.

In one embodiment, the double-headed pipe bender further includes a screw pivoted on the sliding table 13 and a nut threadedly connected with the screw, and the frame of the double-headed pipe bender is fixedly connected with the nut.

In a structural style, when the distance between two groups of pipe bending mechanisms needs to be adjusted, the screw rod can be manually rotated, and the manual adjustment mode is adopted, so that the operation is more convenient.

In another structural form, the double-head pipe bending machine further comprises a motor for driving the screw rod to rotate, namely, the motor drives the screw rod to rotate, so that the distance between the two groups of pipe bending mechanisms is automatically adjusted.

In this embodiment, the nut is slidably coupled to the slide table 13, thereby converting the screw drive between the nut and the lead screw into movement of the nut relative to the lead screw (or the slide table 13).

Or, a guide structure is arranged between the frame and the sliding table 13, and the frame moves relative to the sliding table 13 through the guide structure, so that the nut moves relative to the screw rod (or the sliding table 13). Specifically, a dovetail groove is formed in the sliding table 13, and a dovetail protrusion in sliding fit with the dovetail groove is formed in the rack; or, a dovetail-shaped bulge is arranged on the sliding table 13, and a dovetail-shaped groove in sliding fit with the dovetail-shaped bulge is arranged on the rack.

Specifically, a first thread section and a second thread section which are opposite in spiral direction are arranged on the screw rod, a first nut is matched at the first thread section, a second nut is matched at the second thread section, a rack in one group of pipe bending mechanisms is fixedly connected to the first nut, and a rack in the other group of pipe bending mechanisms is fixedly connected to the second nut.

With manual regulation as an example, during the regulation, hold the lead screw and rotate the lead screw clockwise or anticlockwise with power, make first nut and second nut can move in opposite directions or back of the body mutually to drive two sets of swan neck mechanisms and move in opposite directions or back of the body mutually, realize the regulation of distance between two sets of swan neck mechanisms, through the regulation of distance between the swan neck mechanisms, can adjust the position of bending of pipe fitting.

The lead screw and the nut of the double-head pipe bender are matched to adjust the center distance of the pipe fittings, and the precision of the center distance of the product can be effectively guaranteed. Moreover, the double-end bending machine can bend two ends of the pipe fitting simultaneously, and compared with single-end bending, double-end bending can avoid the occurrence of slipping phenomenon in the single-end bending process, so that the bending effect is better. In this embodiment, the sliding table 13 is further provided with scale marks for marking the size of the pipe in the length direction, and the scales are skillfully utilized, so that an operator can monitor the size of the product (pipe) at any time, and the qualification rate of the product is ensured as much as possible.

On the basis of the above embodiment, with reference to fig. 3 and 4, the double-head pipe bender further includes a pipe releasing member 23, the pipe releasing member 23 includes a clamping portion, and the clamping portion can move relative to the pipe and can abut against the outer surface of the pipe to separate the bent pipe.

In this embodiment, the stripper tube 23 is fixedly connected to the clamping die 9.

Alternatively, the pipe-removing member 23 is fixedly connected to the piston rod of the clamping cylinder 8.

It should be noted that the structure of the pipe-removing member 23 may be various.

For example: the pipe stripping piece 23 is a pipe stripping cross rod (not shown in the drawing), the pipe stripping cross rod is fixedly connected to the clamping die 9 or the piston rod of the clamping oil cylinder 8 through the vertical rod, after the pipe stripping cross rod is arranged in a penetrating mode, the pipe stripping cross rod is located right above the pipe, when the pipe stripping cross rod moves downwards, the pipe stripping cross rod can be pulled to bend and move downwards together, and therefore pipe stripping is achieved.

For another example: as shown in fig. 7, the pipe releasing member 23 includes a first connecting portion 231, and a second connecting portion 232 and a third connecting portion 233 protruding from the first connecting portion 231, respectively, the first connecting portion 231, the second connecting portion 232, and the third connecting portion 233 form a groove structure with an opening facing one side, and the engaging portion is disposed on the second connecting portion 232 or the third connecting portion 233.

In this kind of structural style, the pipe fitting wears to establish the in-process, can pass this groove structure to when guaranteeing groove structure downstream, can stimulate the pipe fitting of bending downstream together, thereby realize taking off the pipe.

Taking the piston rod of the pipe-releasing part 23 fixedly connected to the clamping cylinder 8 as an example, the specific working process of the double-head pipe bender is as follows:

referring to fig. 3, the pipe fitting is placed on the guide die 4 and the clamping die 9 in the two sets of pipe bending mechanisms; under the action of a control device 12, respectively starting the guide die oil cylinders 11 to enable the guide die 4 to move towards the direction close to the crease-resist die 5, and simultaneously respectively starting the clamping oil cylinders 8 to enable the clamping die 9 to move towards the direction close to the circular die 1 to clamp two ends of the pipe fitting; respectively starting the mandrel oil cylinders 6, wherein piston rods of the mandrel oil cylinders 6 drive the mandrels 7 to move transversely until the mandrels 7 are inserted into the pipe fittings on the corresponding sides; respectively starting the pipe bending oil cylinders 10, wherein the pipe bending oil cylinders 10 drive the rotary bases 3 to rotate, and simultaneously the rotary bases 3 drive the guide dies 4, the crease-resist dies 5, the mandrel oil cylinders 6, the mandrels 7 and the guide die oil cylinders 11 to rotate together, so that two ends of the pipe fitting are bent at preset angles at the same time; after the bending is finished, the mandrel oil cylinder 6 and the guide die oil cylinder 11 can simultaneously or sequentially act in the opposite directions, and the bent pipe fitting is loosened; and respectively starting the clamping oil cylinders 8, driving the pipe releasing piece 23 to move downwards by the clamping oil cylinders 8, and simultaneously driving the bent pipe to move downwards until the bent pipe is pulled out downwards, so as to realize pipe releasing. In addition, after the pipe is taken off, the pipe bending oil cylinder 10 works, and parts such as the rotary seat 3 and the like can return to the initial position for the next pipe bending.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims

1. A tube bending mechanism, comprising: the circular mould comprises a circular mould (1) and a fixed shaft (2), wherein the fixed shaft (2) is arranged on a rack, and the circular mould (1) is fixed on the fixed shaft (2) and can rotate along with the fixed shaft (2);

a rotary seat (3) capable of rotating along the fixed shaft (2) is arranged on the fixed shaft (2), a guide die (4) and a crease-resistant die (5) are arranged on the rotary seat (3), the guide die (4) is connected with a guide die oil cylinder (11), a mandrel oil cylinder (6) is further arranged on the rotary seat (3), and a piston rod of the mandrel oil cylinder (6) is connected with a mandrel (7);

the rotary seat (3) is provided with a first driving mechanism for driving the rotary seat (3) to rotate.

2. The pipe bending mechanism according to claim 1, wherein a clamping cylinder (8) is arranged on the frame, and the clamping cylinder (8) is matched with a clamping die (9) for clamping the pipe fitting.

3. The pipe bending mechanism according to claim 1, wherein the first driving mechanism comprises a pipe bending cylinder (10), and the pipe bending cylinder (10) enables the rotary seat (3) to rotate around the fixed shaft (2) through the cooperation of the gear (14) and the rack (15).

4. The pipe bending mechanism according to claim 1, further comprising a control device (12), wherein the control device (12) is electrically connected with the die-guiding cylinder (11), the mandrel cylinder (6) and the first driving mechanism, respectively.

5. The pipe bending mechanism according to claim 2, further comprising a control device (12), wherein the control device (12) is electrically connected with the clamping cylinder (8).

6. The pipe bending mechanism according to claim 1, wherein the mandrel (7) is positioned in a cavity between the guide die (4) and the crease-resist die (5) and is matched with the inner wall of the pipe, and the outer wall of the mandrel (7) is provided with a boss.

7. The pipe bending mechanism according to claim 1, wherein the grooves of the guide die (4) are matched with the grooves of the crease-resist die (5), and the outer side wall of the guide die (4) is provided with a guide groove along the length direction.

8. The pipe bending mechanism according to claim 2, wherein the arc-shaped groove on the outer side of the circular die (1) is matched with the arc-shaped groove of the clamping die (9) to form a circular arc-shaped cavity, and the inner wall of the cavity is matched with the outer wall of the front end of the pipe fitting.

9. A double-headed pipe bender, comprising a slide table (13) and two pipe bending mechanisms according to any of claims 1-8;

the two pipe bending mechanisms are symmetrically arranged on the sliding table (13), and the distance between the two groups of pipe bending mechanisms is adjustable.

10. The double-headed pipe bender according to claim 9, characterized in that a groove is provided on the slide table (13).

11. The double-headed pipe bender according to claim 9, further comprising a pipe stripping member (23), wherein the pipe stripping member (23) comprises a clamping portion, the clamping portion can move relative to the pipe and can abut against the outer surface of the pipe for separating the bent pipe.

12. The double-headed pipe bender according to claim 11, wherein the pipe stripping member (23) comprises a first connecting portion (231), and a second connecting portion (232) and a third connecting portion (233) respectively protruding from the first connecting portion (231), the second connecting portion (232), and the third connecting portion (233) form a slot structure with an opening facing one side, and the clamping portion is disposed on the second connecting portion (232) or the third connecting portion (233).

13. The double-headed bender according to claim 12, characterized in that said strip-off piece (23) is fixedly connected to the clamping die (9);

or the pipe-removing piece (23) is fixedly connected to a piston rod of the clamping oil cylinder (8).