CN114210789A

CN114210789A - Pipe fitting bending forming process

Info

Publication number: CN114210789A
Application number: CN202111310433.3A
Authority: CN
Inventors: 罗荣斌; 胡红; 侯杰
Original assignee: Foshan Yongheng Hydraulic Machinery Co ltd
Current assignee: Foshan Yongheng Hydraulic Machinery Co ltd
Priority date: 2021-11-05
Filing date: 2021-11-05
Publication date: 2022-03-22

Abstract

The invention discloses a pipe fitting bending forming process, which comprises the following steps: () Mounting a pipe fitting to be subjected to bending on a correct position on a pipe bending machine; () Placing a plug matched with the inner cavity of the pipe wall into the pipe wall to form a closed cavity between the plug and the pipe wall; () Starting the liquid supply device to enable pressure liquid to reach a closed cavity in the pipe fitting through a liquid passing mechanism in the plug, so as to play a role of internal support on the pipe wall; () The bending machine is started to perform bending operation on the pipe fitting, so that the pipe fitting is bent under the action of the internal supporting force, wrinkling in the bending process is avoided, and the pipe fitting with better bending effect is obtained. The forming process is easy to operate, and the pipe bending operation process is simpler and more convenient, so that the production efficiency is higher.

Description

Pipe fitting bending forming process

Technical Field

The invention relates to a machining method, in particular to a pipe fitting bending forming process.

Background

In the pipe bending forming process, the clamping block drives the pipe and the bending die to synchronously rotate, the pipe slides over a bending tangent point under the action of the tension of the clamping block and is subjected to bending deformation under the action of bending moment of a bending plane and is contacted with the bending die, so that a preset bending radius of the pipe fitting is formed, and the bending moment of the pipe is generated by the combined force of the tension of the clamping block on the pipe and the friction force between the pipe dies. In the pipe bending process, in order to prevent the pipe from wrinkling and the defect that the cross section is in flat poles excessively, a metal core mould with a plurality of ball heads needs to be arranged in a pipe cavity so as to realize the supporting (inner supporting) function of the inner cavity of the pipe. When the traditional metal core mould is used for producing the bent pipe, for the pipe fitting with small bending radius, the pipe fitting is easy to wrinkle due to the limitation of the rotation range of the metal core mould, so that the production cost is increased; in the pipe bending process, the contact between the core mold and the inner wall of the pipe is uneven, the inner cavity of the pipe is seriously scratched, and the forming quality is difficult to control.

In order to solve the above problems, the invention patent with the publication number of CN 103286173 a discloses a pipe bending method, which comprises the following steps: (1) customizing a cylindrical rubber bag according to the inner diameter of the pipe; (2) customizing a sealing assembly and a connecting nut according to the geometric dimension of the rubber bag, plugging the rubber bag and the sealing assembly into the inner cavity of the pipe, and clamping the pipe on the pipe shutdown machine through a clamping block, a pressing block, a bending die and a crease-resistant block of the pipe bender; (3) connecting a connecting nut with a pressure cylinder, and injecting a pressure liquid medium into the rubber bag to ensure that the rubber bag is pressed to expand along the radial direction of the pipe; (4) setting a pipe bending angle, starting a pipe bending machine, starting pipe bending operation, keeping the force of a pressure cylinder and keeping the rotating linear speed of a bending die, the boosting speed of a pressing block and the feeding speed of a pushing piece to be the same in the pipe bending process until the set bending angle is reached; (5) and taking down the connecting nut, discharging the liquid medium in the rubber bag, recovering the rubber bag to the original shape, drawing out the rubber bag from the inner cavity of the pipe, unloading the clamping block and the pressing block, and taking out the pipe fitting. According to the pipe bending method, the liquid-filled rubber bag is used for replacing a traditional metal core mould, so that deformation coordination between a support inside a pipe cavity and a smaller bending radius can be realized, meanwhile, liquid-filled internal pressure support can ensure that the rubber bag can realize self-adaptive contact with the uneven inner wall of the pipe, and the wrinkling possibility of the small-bending-radius pipe is effectively inhibited; compared with the traditional metal core mold, the liquid-filled rubber bag is soft in texture, and can effectively reduce scratches of the inner cavity of the pipe. However, the pipe bending internal pressure supporting device still has the following problems:

1. for the pipe fittings with different inner diameters, rubber bags need to be specially customized, the complexity of the structure of the equipment is increased, and the manufacturing cost of the equipment is increased.

2. The installation process is complicated, the sealing plug needs to be placed into the rubber bag firstly, then the connecting nut is connected with the sealing plug and the pressure cylinder respectively, and then pressure liquid is introduced, so that the production efficiency is low due to excessive working procedures.

3. Every time the molding of a return bend is accomplished, all need carry out the operation of once dismantling seal assembly: the connecting nut is taken down, the liquid medium in the rubber bag is discharged, and the rubber bag is pumped out from the inner cavity of the pipe after being recovered, so that the operation process is complicated, and the efficiency is low.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a pipe fitting bending forming process which is easy to operate, and the pipe bending operation process is simpler and more convenient, so that the production efficiency is higher, and the pipe fitting forming quality is higher.

The technical scheme for solving the technical problems is as follows:

a pipe fitting bending forming process comprises the following steps:

(1) mounting a pipe fitting to be subjected to bending on a correct position on a pipe bending machine;

(2) placing a plug matched with the pipe wall into the pipe fitting, wherein the plug plugs two ends of an inner cavity of the pipe fitting, and a space between the two blocked ends in the inner cavity of the pipe fitting forms a closed cavity; the plug is provided with a liquid passing mechanism communicated with the closed cavity;

(3) starting the liquid supply device to enable pressure liquid to reach a closed cavity in the pipe fitting through a liquid passing mechanism in the plug, so as to play a role of internal support on the pipe wall;

(4) starting a bending machine to perform bending operation on the pipe fitting, wherein in the bending process, pressure liquid in the pipe fitting always provides hydraulic support for the inner wall of the pipe fitting, so that the pipe fitting is prevented from wrinkling and collapsing during bending;

(5) and after the bending is finished, taking out the plug to obtain the bent pipe fitting.

In a preferable scheme of the invention, in the step (2), two ends of the inner cavity of the pipe fitting are plugged by two plugs, and a liquid passing mechanism is arranged on one plug.

Preferably, the step of placing the two plugs into the pipe comprises the following steps:

a1, inserting one of the plugs from one end of the pipe fitting, so that the outer wall of each plug is matched with the inner wall of one end of the pipe fitting;

and A2, inserting the other plug from the other end of the pipe fitting, so that the outer wall of the plug is matched with the inner wall of the other end of the pipe fitting, and a closed cavity is formed between the two plugs and the inner wall of the pipe fitting.

According to a preferable scheme of the invention, in the step (2), an integrated plug is adopted to plug the inner cavity of the pipe fitting, the integrated plug is provided with a plug body, and the two ends of the plug body are respectively provided with a front plugging part and a rear plugging part for plugging the two ends of the inner cavity of the pipe fitting; a plurality of supporting joint units are arranged between the front plugging part and the rear plugging part, and are connected by adopting spherical joints and used for bending along the pipe fitting during bending and rigidly supporting the bending part of the pipe fitting; meanwhile, a hydraulic support cavity is formed between the support joint units, and the liquid passing mechanism provides a liquid medium for the hydraulic support cavity, and the liquid medium hydraulically supports the bending part when the pipe fitting is bent.

Preferably, the plug rod is connected with the plug body, and when the pipe fitting is subjected to bending operation, the plug rod is operated, so that the plug rod pushes the plug body to move forward to enter the pipe fitting from one end of the pipe fitting, and pushes the plug body to a position where the pipe fitting is bent and deformed, and the two ends of the inner cavity of the pipe fitting are plugged; after the bending is finished, the plugging rod is operated, so that the plugging rod moves towards the end part of the pipe fitting and drags the plugging body to leave the bending position of the bent pipe.

Preferably, for a pipe requiring a single bend, the stopper rod is operated so that the stopper rod pushes the stopper body into the pipe from one end of the pipe and forms a plug at both ends of the position where the pipe is bent around; after the pipe fitting is bent, operating the plug rod to enable the plug rod to move towards the end of the pipe fitting and drag the plug body to leave the pipe fitting, and taking down the pipe fitting to finish the bending operation of the pipe fitting; for the pipe fitting needing to be continuously bent, operating the plug rod to enable the plug body to enter the pipe fitting and form plugs at two ends of the bent position of the pipe fitting; after one-time bending operation is finished, the plug rod is operated, the plug body is pulled backwards to be away from the bent position, the plug body is located at the next position to be bent in the pipe fitting, then bending operation is continued, and after the bending operation is finished, the plug rod is operated, the plug body is pulled backwards to be away from the bent position of the pipe fitting, and continuous bending operation is finished.

Preferably, a communication hole is arranged in the support joint unit, an inner through hole is arranged in the plug rod along the axial direction, and the inner through hole is communicated with the communication hole to form a liquid passing mechanism; and connecting the liquid supply system with the inner through hole in the plug rod by using a conveying pipeline, starting the liquid supply system, and enabling the pressure liquid to reach the liquid passing mechanism from the liquid supply system through the pipeline.

Preferably, each support joint unit is provided as two half support joint units with a gap formed therebetween; and starting the liquid supply system, so that pressure liquid enters the liquid passing mechanism, and the pressure liquid enters the hydraulic support cavity through the gap between the half support units, thereby hydraulically supporting the bending part when the pipe fitting is bent.

Preferably, after the pipe fitting is bent, the plug rod is operated to pull the plug body back, and in the process, the friction force between the plug body and the inner wall of the pipe fitting is prevented from being too large by utilizing the lubricating effect of the liquid medium, so that the plug body can smoothly exit from the bent position of the pipe fitting.

Preferably, after the pipe fitting is bent, the operation plug pulls back the plug body, and in the process, the support joint unit shapes the micro-fold deformation generated at the position supported by the original liquid medium, so that the bending effect of the pipe fitting is further improved, and the quality of the bent pipe is improved.

Compared with the prior art, the invention has the following beneficial effects:

1. according to the pipe bending forming device, the liquid medium directly acts on the inner cavity of the pipe, so that the pipe can be prevented from wrinkling and collapsing in the bending process, and the bending forming effect is good. .

2. According to the pipe bending forming device, the outer wall of the plug is directly matched with the inner cavity of the pipe, so that a sealed cavity is formed when the inner cavity is closed, and after the pipe is formed, the plug is directly taken down, so that a workpiece can be taken away, the pipe bending forming device is simple in structure, convenient to operate and higher in production efficiency of bent pipes.

Drawings

Fig. 1 to 7 are schematic views of a first embodiment, and fig. 1 to 3 are overall schematic views of a bending apparatus, wherein fig. 1 is a front sectional view, fig. 2 is a top view, and fig. 3 is a perspective view.

Fig. 4-5 are schematic views of the plug in the mold, wherein fig. 4 is a front sectional view and fig. 5 is a perspective view.

Fig. 6 to 7 are schematic views of the plug, wherein fig. 6 is a front sectional view and fig. 7 is a perspective view.

Fig. 8 to 18 are schematic views of a second embodiment, wherein fig. 8 to 10 are schematic views of a plug in a mold, wherein fig. 8 is a front sectional view before bending, fig. 9 is a front sectional view after 90 ° bending, and fig. 10 is a perspective view.

Fig. 11 to 12 are schematic views of a plug, wherein fig. 11 is a front sectional view and fig. 12 is a perspective view.

Fig. 13 to 14 are schematic views of the support joint unit, in which fig. 13 is a front sectional view and fig. 14 is a perspective view.

Fig. 15 to 16 are schematic views of the front occlusion part, wherein fig. 15 is a front sectional view and fig. 16 is a perspective view.

Fig. 17 to 18 are schematic views of the rear occlusion part, wherein fig. 17 is a front sectional view and fig. 18 is a perspective view.

Fig. 19 is a flow chart of the pipe wrap forming process of the present invention.

Detailed Description

The present invention will be described in further detail with reference to examples and drawings, but the present invention is not limited thereto.

The pipe bending forming process is completed by pipe bending forming equipment, and the pipe bending forming equipment has the following implementation modes:

example 1

Referring to fig. 1 to 7, a pipe bending and forming apparatus of the present invention includes a pipe bender, a mold disposed on the pipe bender, and a sealing mechanism for forming a closed space in an inner cavity of the pipe; the pipe bender comprises a frame 1 and a pipe bending device arranged on the frame 1, wherein the pipe bending device comprises a pipe assembly 2 for limiting the position of a pipe in the radial direction and a pipe bending assembly 3 for driving the pipe to perform bending movement; the mould comprises a conduit module 4 and a pipe bending module 5 for clamping a pipe fitting during bending, wherein the conduit module 4 is arranged corresponding to the conduit assembly 2, and the pipe bending module 5 is arranged corresponding to the pipe bending assembly 3; the sealing mechanism comprises a plug which is directly contacted and matched with the inner wall of the pipe fitting, the plug comprises a front plugging section and a rear plugging section, a sealing cavity is formed among the front plugging section, the rear plugging section and the pipe wall, and the sealing cavity corresponds to the bent position of the pipe fitting; at least one of the front plugging section and the rear plugging section is internally provided with a liquid channel for communicating the liquid supply system with the sealed cavity.

Referring to fig. 1-7, there are two plugs, the two plugs are respectively disposed at two ends of the pipe, and a liquid passing mechanism is disposed inside at least one of the plugs; the outer wall of the plug is matched with the inner wall of the pipe fitting, so that a closed cavity is formed between the plug and the pipe wall, and the closed cavity is communicated with the liquid passing mechanism.

Referring to fig. 1 to 7, the plugs include a sealing plug 6 and a liquid-passing plug 7, the sealing plug 6 is used for plugging one end of the pipe, the liquid-passing plug 7 is used for plugging the other end of the pipe, the liquid-passing plug 7 forms the front plugging section, and the sealing plug 6 forms the rear plugging section; and a liquid passing mechanism is arranged in the liquid passing plug 7. Set up above-mentioned end cap, the one end with airtight end cap 6 insertion pipe fitting, when the other end that will lead to liquid end cap 7 insertion pipe fitting, at airtight end cap 6, lead to and form a closed cavity between liquid end cap 7 and the pipe fitting inner wall, when pressure liquid enters into through leading to liquid mechanism, pressure liquid plays the effect of outside support to the pipe wall in entering into the closed cavity of pipe fitting to can prevent that the pipe fitting from wrinkling around the curved in-process, improve around curved shaping effect.

Referring to fig. 1-7, the liquid-passing plug 7 includes a plugging section 7-1 matched with the inner wall of the pipe, a communicating section 7-2 connected with the plugging section 7-1, and an external section 7-3 connected with the communicating section 7-2; the outer diameter of the communicating section 7-2 is smaller than that of the plugging section 7-1, and the outer diameter of the external section 7-3 is larger than that of the plugging section 7-1. The liquid-passing plug 7 with the structure is arranged, and because the outer diameter of the communication section 7-2 is smaller than that of the blocking section 7-1, a step is formed at the transition part of the blocking section 7-1 and the communication section 7-2, and when the plug is installed on a winding bending machine, the step can play a role in limiting the axial position of the plug, so that the position of the liquid-passing plug 7 on a pipe fitting can be controlled; the outer diameter of the external section 7-3 is larger than that of the plugging section 7-1, namely the outer diameter of the external section 7-3 is the largest, so that the connection is more stable and reliable when the external section 7-3 is connected with the liquid supply mechanism.

Referring to fig. 1-7, the liquid passing mechanism comprises a liquid passing groove 7-4 arranged at the axial position of the liquid passing plug 7, and the liquid passing groove 7-4 penetrates through the whole liquid passing plug 7. The liquid passing groove 7-4 is arranged, the external section 7-3 is connected with the liquid supply mechanism, and when the liquid passing groove 7-4 is communicated with a liquid supply outlet of the liquid supply mechanism, pressure liquid of the liquid supply mechanism enters the inner cavity of the pipe fitting through the liquid passing groove 7-4 to form outward supporting force on the inner wall of the pipe fitting, so that the pipe fitting can be prevented from wrinkling in the bending process, and the bending forming effect is improved.

Referring to fig. 1-7, a first sealing structure is arranged on the liquid passing plug 7, the first sealing structure is arranged at the front end of the plugging section 7-1, the first sealing structure comprises a sealing ring 8 and a connecting structure for connecting the sealing ring 8 to the plugging section 7-1, and the outer diameter of the sealing ring 8 is adapted to the inner diameter of the pipe fitting; the connecting structure comprises a threaded hole axially arranged on the plugging section 7-1, a first screw matched with the threaded hole and a threaded through hole arranged on the sealing ring 8, wherein a through hole is formed in the axis of the first screw and penetrates through the whole first screw. Arranging the first sealing structure, and enabling a first screw to penetrate through the threaded through hole in the sealing ring 8 and to be screwed with the threaded hole in the plugging section 7-1, so that the sealing ring 8 can be locked at the front end of the plugging section 7-1, and the through hole is communicated with the liquid through groove 7-4 due to the fact that the through hole is formed in the axis of the first screw, and pressure liquid can conveniently enter the inner cavity of the pipe fitting; when letting in pressure liquid, because the external diameter of sealing washer 8 suits with the pipe fitting inner wall, the internal wall of tight pipe fitting is pasted to the external diameter of sealing washer 8 to prevent that pressure liquid from revealing.

Referring to fig. 1 to 7, a second sealing structure is arranged at the front end of the sealing plug 6, the second sealing structure includes a sealing ring 8 and a connecting structure for connecting the sealing ring 8 to the sealing plug 6, and the outer diameter of the sealing ring 8 is adapted to the inner diameter of the pipe fitting; the connecting structure comprises a threaded hole arranged at the front end of the sealed plug 6 along the axial direction, a second screw matched with the threaded hole and a threaded through hole arranged on the sealing ring 8. Arranging the second sealing structure, and enabling a second screw to penetrate through the threaded through hole in the sealing ring 8 and be screwed with the threaded hole, so that the sealing ring 8 can be locked at the front end of the sealed plug 6; when letting in pressure liquid, because the external diameter of sealing washer 8 suits with the pipe fitting inner wall, the internal wall of tight pipe fitting is pasted to the external diameter of sealing washer 8 to prevent that pressure liquid from revealing.

Referring to fig. 1 to 7, the elbow module 5 includes an elbow fixed die 23 and an elbow movable die 24, and both the elbow fixed die 23 and the elbow movable die 24 are provided with an elbow die cavity matched with the outer wall of the pipe fitting; the catheter module 4 comprises a fixed catheter mould 25 and a movable catheter mould 26; and the guide pipe fixed die 25 and the guide pipe movable die 26 are respectively provided with a guide pipe die cavity matched with the outer wall of the pipe fitting.

Referring to fig. 1 to 7, the bending pipe assembly 3 includes a bending driving mechanism for driving the bending module 5 to perform bending rotation, and the bending driving mechanism includes a rotating shaft 27 connected to the bending module 5, a driving motor 28, and a transmission mechanism disposed between the driving motor 28 and the rotating shaft 27. Set up above-mentioned return bend subassembly 3, driving motor 28 starts, through drive mechanism's transmission effect for axis of rotation 27 rotates, and axis of rotation 27 is connected with return bend module 5, and axis of rotation 27's rotation makes return bend module 5 follow the rotation, thereby realizes around the bending motion.

Referring to fig. 1-7, the elbow assembly 3 further includes a clamping driving mechanism for driving the elbow movable die 24 to move, and the clamping driving mechanism includes a slide block for mounting the clamping block, a clamping driving cylinder 29 for driving the slide block to make a linear motion, and a link mechanism connected between the slide block and the clamping driving cylinder 29. Set up above-mentioned tight actuating mechanism of clamp, press from both sides when driving actuating cylinder 29 drive piston rod forward motion, promote link mechanism forward to make the slider of being connected with link mechanism forward motion, owing to press from both sides tight piece and install on the slider, consequently the slider forward motion makes and presss from both sides tight piece forward motion, thereby presss from both sides tight pipe fitting that needs around the bending.

Referring to fig. 1 to 7, the duct assembly 2 includes a pressing driving mechanism for driving the duct moving die 26 to move, and the pressing driving mechanism includes a sliding block for mounting the pressing block, a pressing driving cylinder 30 for driving the sliding block to move linearly, and a link mechanism connected between the sliding block and the pressing driving cylinder 30. Set up above-mentioned pressing drive mechanism, when pressing and driving actuating cylinder 30 drive piston rod forward motion, promote coupling mechanism forward to make the sliding block of being connected with link mechanism forward motion, because the briquetting is installed on the sliding block, consequently the sliding block makes the briquetting forward motion toward forward motion, thereby compresses tightly the pipe fitting.

Referring to fig. 1-7, the working principle of the pipe bending and forming device is as follows:

firstly, the pipe bender is started, and the pipe guide assembly 2 and the pipe bending assembly 3 act to open the pipe guide module 4 and the pipe bending module 5; then, the pipe fitting to be wound is mounted on the pipe module 4 and the pipe bending module 5; then, the sealing mechanism acts to place the plug into the inner cavity of the pipe fitting, so that a closed cavity is formed in the inner cavity of the pipe fitting; secondly, the conduit assembly 2 and the elbow assembly 3 continue to act to close the conduit module 4 and the elbow module 5, so that the pipe fitting is clamped, meanwhile, the pressurizing system is started, and the pressurizing pump conveys liquid in the liquid storage tank into a closed cavity of the pipe fitting through a liquid conveying pipeline, so that the pressure liquid forms an outward pressure support on the inner wall of the pipe fitting; thirdly, the pipe bending component 3 is started to drive one end of the pipe fitting to perform bending movement, so that the pipe fitting is formed in a bending mode; and next, the sealing mechanism acts, the plug is removed, finally, the conduit assembly 2 and the pipe bending assembly 3 act, the conduit module 4 and the pipe bending module 5 are opened, the pipe fitting after being wound is removed, and the winding forming processing of the pipe fitting is completed. In the pipe bending process, the liquid medium directly acts on the inner cavity of the pipe fitting to support the inner cavity of the pipe wall, so that the coordination of deformation of the support and different bending radiuses in the pipe cavity is realized, the pipe fitting is prevented from wrinkling in the bending process, the whole structure is simpler, after the bending is finished, a workpiece can be taken away after the plug is taken down, the operation is more convenient, and the production efficiency is effectively improved.

Example 2

Referring to fig. 8 to 18, the difference between the present embodiment and embodiment 1 is that the plug includes a plug body 9 for plugging an inner wall of the pipe to form a closed cavity and supporting the inner wall of the pipe during bending, and a plug rod 10 for pushing the plug body 9 into an inner cavity of the pipe, and liquid passing mechanisms that are communicated with each other are disposed in the plug body 9 and the plug rod 10; the front end of the plug rod 10 is connected with the plug body 9; the plug body 9 comprises a front plugging part 11, a rear plugging part 12 and a support joint unit part 13 arranged between the front plugging part 11 and the rear plugging part 12, the support joint unit part 13 comprises a plurality of support joint units for supporting the inner wall of the pipe fitting, the support joint units are connected through spherical joints, two adjacent support joint units are provided with hydraulic support cavities for containing liquid media to hydraulically support the inner wall of the pipe fitting, and the hydraulic support cavities are communicated with a liquid passing mechanism; the front plugging portion 11 constitutes the front plugging section, and the rear plugging portion 12 constitutes the rear plugging section.

Referring to fig. 8-18, the supporting joint unit comprises a joint part 14 and a clamping sleeve 15 sleeved on the joint part 14, wherein the outer diameter of the clamping sleeve 15 is matched with the inner diameter of the pipe fitting; the joint part 14 comprises a joint body, a spherical groove 16 arranged in the front end of the joint body and a spherical connecting body 17 arranged at the rear end of the joint body; when two adjacent supporting joint units are connected, the spherical connecting body 17 of one joint part 14 is matched with the spherical groove 16 of the other joint part 14, and the gap between the two adjacent joint parts 14 is smaller than the width of the clamping sleeve 15. The support joint unit with the structure is arranged, and in two adjacent support joint units, the spherical groove 16 is matched with the spherical connector 17, so that the spherical joint connection is realized, the support joint units can flexibly rotate mutually, and the bending action of the following pipe fitting is realized.

Referring to fig. 8-18, the outer wall of the front end of the joint body is provided with an annular step, and the clamping sleeve 15 comprises a sleeve part matched with the outer wall of the joint body and a clamping part matched with the annular step; the gap between two adjacent joints is smaller than the width of the clamping sleeve 15. The clamping sleeve 15 with the structure is arranged, the clamping sleeve 15 is sleeved from the rear end of the joint part 14, the annular step of the joint part 14 is clamped with the clamping part after the sleeve is sleeved in place, and the clamping sleeve 15 can be dragged to move backwards when the joint part 14 is pulled backwards; since the gap between two adjacent joint portions 14 is smaller than the width of the clamping sleeve 15, when the joint portions 14 are pushed forward, even if the clamping sleeve 15 slides backward, the clamping sleeve 15 still pushes the next joint portion 14, namely, the clamping sleeve 15 has a limiting structure in the front and the back, so that the clamping sleeve can be firmly connected to the joint portions 14.

Referring to fig. 8-18, the joint 14 includes two symmetrically disposed half joints 14-1, with a gap formed between the two half joints, which communicates the hydrodynamic bearing chamber with the fluid communication mechanism. By arranging the joint part 14 with the structure, when the supporting joint unit is installed, firstly, the spherical groove 16 of one semi-joint part 14-1 is matched with the spherical connecting body 17 on the adjacent joint part 14, then, the spherical groove 16 of the other semi-joint part 14-1 is matched with the spherical connecting body 17, the two semi-joint parts 14-1 are symmetrical to form an integral joint part 14, at the moment, the clamping sleeve 15 is sleeved on the outer side of the joint body, so that the clamping sleeve 15 clamps and fixes the two semi-joint parts 14-1, and the spherical groove 16 and the adjacent spherical connecting body 17 form spherical joint connection, the design is ingenious, and the function is strong; meanwhile, a gap is formed between the two half joint parts 14-1 by arranging the two half joint parts 14-1, the gap communicates the liquid passing mechanism with the hydraulic support cavity, pressure liquid flows into the hydraulic support cavity through the gap after entering the liquid passing mechanism, so that hydraulic support is formed between the two support joint units, and each support joint unit and liquid medium in the hydraulic support cavity play a role of inner support on the inner wall of the pipe fitting, so that the pipe fitting is prevented from wrinkling and collapsing in the bending process.

Referring to fig. 8 to 18, the plugging front portion 11 includes a plugging head 18 and a front sealing ring 19 sleeved on the plugging head 18; the outer diameter of the front sealing ring 19 is matched with the inner diameter of the pipe fitting, and the plugging head 18 is connected to the supporting joint unit part 13 through a spherical joint. The plugging front part 11 with the structure is arranged, and after the front part of the plug is inserted into the pipe fitting, the plug 18 and the front sealing ring 19 are abutted against the inner wall of the pipe fitting, so that the sealing effect is achieved.

Referring to fig. 8-18, the plugging head 18 includes a plugging head body 18-1, an annular protrusion disposed at a front end of the plugging head body 18-1, and a spherical connecting body 17 disposed at a rear end of the plugging head body 18-1; the spherical connecting body 17 is matched with the spherical groove 16 of the foremost support joint unit; the outer diameter of the plugging head body 18-1 is matched with the inner diameter of the front sealing ring 19. The plugging head 18 with the structure is arranged, the front sealing ring 19 is sleeved on the plugging head body 18-1, and the front end of the front sealing ring 19 abuts against the annular bulge, so that the front sealing ring 19 is tightly clamped on the plugging head 18; the spherical connecting body 17 is matched with the spherical groove 16 on the supporting joint unit, and the blocking head 18 is connected with the supporting joint unit part 13 through a spherical joint, so that the blocking head 18 can flexibly rotate relative to the supporting joint unit part 13.

Referring to fig. 8-18, the rear plugging portion 12 includes a plugging column 20 and a rear sealing ring 21 fitted over the plugging column 20, and the outer diameter of the rear sealing ring 21 matches the inner diameter of the pipe; the plugging column 20 is sleeved at the front end of the plugging rod 10, and the front end of the plugging column 20 protrudes out of the front end of the plugging rod 10, so as to form an installation section, and the rear sealing ring 21 is sleeved on the installation section; the front end of the plugging column 20 is internally provided with a spherical groove 16 matched with a spherical connecting body 17 supporting the joint unit. Set up the back shutoff portion 12 of above-mentioned structure, shutoff post 20 is connected on end cap pole 10, shutoff post 20 passes through spherical joint with the support joint unit and is connected, end cap pole 10 is connected with end cap body 9 like this, after end cap pole 10 promoted end cap body 9 and gets into in the pipe fitting, back sealing washer 21 pastes tight pipe fitting inner wall, thereby seal 19 in the front, form a airtight cavity between back sealing washer 21 and the pipe fitting inner wall, after letting in pressure liquid, play the effect of an outside support to the pipe fitting inner wall, prevent that the pipe fitting from wrinkling when the bending, improve the return bend effect.

Referring to fig. 8-18, the plugging column 20 includes two symmetrically disposed half plugging columns 20-1. By arranging the connecting column with the structure, when the blocking column 20 is connected with the supporting joint unit, firstly, the spherical groove 16 of one semi-blocking column 20-1 is matched with the spherical connector 17 of the supporting joint unit; then, matching the spherical groove 16 of the other half plugging column 20-1 with the spherical connector 17 of the supporting joint unit, so that the two half plugging columns 20-1 are symmetrical to form an integral plugging column 20; finally, the rear sealing ring 21 is sleeved, and the plugging column 20 is sleeved in the plugging rod 10, so that the connection between the plugging column 20 and the supporting joint unit is completed.

Referring to fig. 8 to 18, the plugging column 20 is connected to the plugging rod 10 by a connection structure, which includes a front receiving hole provided at the front end of the plugging rod 10 for receiving the plugging column 20, a screw counterbore provided at the rear end of the plugging rod 10, a connection screw 22, and a threaded hole provided at the rear end of the plugging column 20. The connecting structure is arranged, after the plugging column 20 is sleeved into the front accommodating hole, the connecting screw 22 penetrates through the screw counter bore, so that the connecting screw 22 is connected and screwed with the threaded hole at the rear end of the plugging column 20, and the plugging column 20 is connected with the plugging rod 10.

Referring to fig. 8-18, the fluid-passing mechanism includes a screw fluid-passing hole provided in the connection screw 22, a blocking post 20 fluid-passing hole provided in the blocking post 20, and a joint portion 14 fluid-passing hole provided in the joint portion 14; the screw liquid through hole, the plugging column 20 liquid through hole and the joint part 14 liquid through hole are communicated with each other. The liquid passing mechanism is arranged, the liquid supply mechanism is started, pressure liquid is conveyed into the screw counter bore at the rear end of the plug rod 10, the pressure liquid sequentially passes through the screw liquid passing groove 7-4, the blocking column 20 liquid passing groove 7-4 and the joint part 14 liquid passing groove 7-4 to reach the interior of the plug body 9, and the joint part 14 comprises two half joint parts 14-1 which are symmetrically arranged, so that the pressure liquid can reach the inner cavity of the pipe fitting through a gap between the two half joint parts 14-1, and the inner wall of the pipe fitting is supported outwards.

A pipe fitting bending forming process implemented by the pipe fitting bending equipment comprises the following steps:

In the step (2) in the implementation, the two ends of the inner cavity of the pipe fitting are plugged by the two plugs, and one plug is provided with a liquid passing mechanism.

In this embodiment, placing the two plugs into the pipe includes the following steps:

In the step (2) of this embodiment, an integral plug is used to plug the inner cavity of the pipe, the integral plug is provided with a plug body, and both ends of the plug body are respectively provided with a front plugging portion and a rear plugging portion for plugging both ends of the inner cavity of the pipe; a plurality of supporting joint units are arranged between the front plugging part and the rear plugging part, and are connected by adopting spherical joints and used for bending along the pipe fitting during bending and rigidly supporting the bending part of the pipe fitting; meanwhile, a hydraulic support cavity is formed between the support joint units, and the liquid passing mechanism provides a liquid medium for the hydraulic support cavity, and the liquid medium hydraulically supports the bending part when the pipe fitting is bent.

In the embodiment, the plug rod is connected with the plug body, and when the pipe fitting is subjected to bending operation, the plug rod is operated, so that the plug rod pushes the plug body to move forward to enter the pipe fitting from one end of the pipe fitting, and pushes the plug body to be located at the bending deformation position of the pipe fitting, and the two ends of the inner cavity of the pipe fitting are plugged; after the bending is finished, the plugging rod is operated, so that the plugging rod moves towards the end part of the pipe fitting and drags the plugging body to leave the bending position of the bent pipe.

In the embodiment, for the pipe fitting needing a single elbow, the plug rod is operated, so that the plug rod pushes the plug body to enter the pipe fitting from one end of the pipe fitting, and plugs are formed at two ends of the position where the pipe fitting is bent; after the pipe fitting is bent, operating the plug rod to enable the plug rod to move towards the end of the pipe fitting and drag the plug body to leave the pipe fitting, and taking down the pipe fitting to finish the bending operation of the pipe fitting; for the pipe fitting needing to be continuously bent, operating the plug rod to enable the plug body to enter the pipe fitting and form plugs at two ends of the bent position of the pipe fitting; after one-time bending operation is finished, the plug rod is operated, the plug body is pulled backwards to be away from the bent position, the plug body is located at the next position to be bent in the pipe fitting, then bending operation is continued, and after the bending operation is finished, the plug rod is operated, the plug body is pulled backwards to be away from the bent position of the pipe fitting, and continuous bending operation is finished.

In the embodiment, the communicating hole is arranged in the support joint unit, the inner through hole is axially arranged in the plug rod, and the inner through hole is communicated with the communicating hole to form a liquid passing mechanism; and connecting the liquid supply system with the inner through hole in the plug rod by using a conveying pipeline, starting the liquid supply system, and enabling the pressure liquid to reach the liquid passing mechanism from the liquid supply system through the pipeline.

In this embodiment, each support joint unit is provided as two half support joint units, and a gap is formed between the two half support units; and starting the liquid supply system, so that pressure liquid enters the liquid passing mechanism, and the pressure liquid enters the hydraulic support cavity through the gap between the half support units, thereby hydraulically supporting the bending part when the pipe fitting is bent.

In this embodiment, after the pipe fitting is around the curved completion, operation end cap pole is toward pulling back end cap body, and at this in-process, the lubricated effect of utilizing liquid medium prevents that the frictional force of end cap body and pipe fitting inner wall is too big for the end cap body can withdraw from the position that the pipe fitting is around the curved smoothly.

In this embodiment, after the pipe fitting is around bent, the operation end cap pulls back the end cap body, and at this in-process, the support joint unit is deformed to the trace fold that has the position production that the liquid medium supported originally and is reshaped, further promotes the effect of bending around of pipe fitting, improves the return bend quality.

The present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents and are included in the scope of the present invention.

Claims

1. The pipe fitting bending forming process is characterized by comprising the following steps of:

2. The pipe bending and forming process according to claim 1, wherein in the step (2), two plugs are provided, and one of the two plugs is provided with a liquid passing mechanism.

3. A pipe bending and forming process according to claim 2, wherein the step of placing the two plugs into the pipe comprises the following steps:

a1, inserting one of the plugs from one end of the pipe fitting to ensure that the outer wall of the plug is matched with the inner wall of the pipe fitting;

and A2, inserting the other plug from the other end of the pipe fitting, so that the outer wall of the plug is matched with the inner wall of the pipe fitting, and a closed cavity is formed between the two plugs and the inner wall of the pipe fitting.

4. The pipe bending forming process according to claim 1, wherein in the step (2), the inner cavity of the pipe is blocked by using an integrated plug, the integrated plug is provided with a plug body, and the plug body is respectively provided with a front blocking part and a rear blocking part at two ends for blocking two ends of the inner cavity of the pipe; a plurality of supporting joint units are arranged between the front plugging part and the rear plugging part, and are connected by adopting spherical joints and used for bending along the pipe fitting during bending and rigidly supporting the bending part of the pipe fitting; meanwhile, a hydraulic support cavity is formed between the support joint units, and the liquid passing mechanism provides a liquid medium for the hydraulic support cavity, and the liquid medium hydraulically supports the bending part when the pipe fitting is bent.

5. The pipe bending forming process according to claim 4, wherein the plug rod is connected with the plug body, and when the pipe is subjected to bending operation, the plug rod is operated, so that the plug rod pushes the plug body to move forward to enter the pipe from one end of the pipe and pushes the plug body to a position where the pipe is bent and deformed, and thus the two ends of the inner cavity of the pipe are plugged; after the bending is finished, the plugging rod is operated, so that the plugging rod moves towards the end part of the pipe fitting and drags the plugging body to leave the bending position of the bent pipe.

6. A pipe bending and forming process according to claim 5, wherein for a pipe requiring a single bend, the stopper rod is operated so that the stopper rod pushes the stopper body into the pipe from one end of the pipe and forms a plug at both ends of the position where the pipe is bent; after the pipe fitting is bent, operating the plug rod to enable the plug rod to move towards the end of the pipe fitting and drag the plug body to leave the pipe fitting, and taking down the pipe fitting to finish the bending operation of the pipe fitting; for the pipe fitting needing to be continuously bent, operating the plug rod to enable the plug body to enter the pipe fitting and form plugs at two ends of the bent position of the pipe fitting; after one-time bending operation is finished, the plug rod is operated, the plug body is pulled backwards to be away from the bent position, the plug body is located at the next position to be bent in the pipe fitting, then bending operation is continued, and after the bending operation is finished, the plug rod is operated, the plug body is pulled backwards to be away from the bent position of the pipe fitting, and continuous bending operation is finished.

7. The pipe bending forming process according to claim 6, wherein a communication hole is formed in the support joint unit, an inner through hole is axially formed in the inner part of the plug rod, and the inner through hole is communicated with the communication hole to form a liquid passing mechanism; and connecting the liquid supply system with the inner through hole in the plug rod by using a conveying pipeline, starting the liquid supply system, and enabling the pressure liquid to reach the liquid passing mechanism from the liquid supply system through the pipeline.

8. A pipe bending and forming process according to claim 7, wherein each support joint unit is provided as two half support joint units, and a gap is formed between the two half support units; and starting the liquid supply system, so that pressure liquid enters the liquid passing mechanism, and the pressure liquid enters the hydraulic support cavity through the gap between the half support units, thereby hydraulically supporting the bending part when the pipe fitting is bent.

9. The pipe bending and forming process according to claim 5, wherein after the pipe bending is completed, the plug rod is operated to pull the plug body back, and during the process, the friction between the plug body and the inner wall of the pipe is prevented from being too large by using the lubricating effect of the liquid medium, so that the plug body can smoothly exit from the pipe bending position.

10. The pipe bending forming process according to claim 5, wherein after the pipe is bent, the plug is operated to pull back the plug body, and in the process, the support joint unit shapes the micro-fold deformation generated at the position originally supported by the liquid medium, so that the bending effect of the pipe is further improved, and the quality of the bent pipe is improved.