CN114247784A - Pipe bending device - Google Patents
Pipe bending device Download PDFInfo
- Publication number
- CN114247784A CN114247784A CN202111579479.5A CN202111579479A CN114247784A CN 114247784 A CN114247784 A CN 114247784A CN 202111579479 A CN202111579479 A CN 202111579479A CN 114247784 A CN114247784 A CN 114247784A
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- Prior art keywords
- wheel
- bending
- workbench
- driven shaft
- driven
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- 238000005452 bending Methods 0.000 title claims abstract description 89
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 32
- 239000010959 steel Substances 0.000 claims abstract description 32
- 230000005540 biological transmission Effects 0.000 claims abstract description 28
- 238000003825 pressing Methods 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 abstract description 15
- 238000009434 installation Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D7/00—Bending rods, profiles, or tubes
- B21D7/02—Bending rods, profiles, or tubes over a stationary forming member; by use of a swinging forming member or abutment
- B21D7/024—Bending rods, profiles, or tubes over a stationary forming member; by use of a swinging forming member or abutment by a swinging forming member
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D7/00—Bending rods, profiles, or tubes
- B21D7/14—Bending rods, profiles, or tubes combined with measuring of bends or lengths
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D7/00—Bending rods, profiles, or tubes
- B21D7/16—Auxiliary equipment, e.g. for heating or cooling of bends
Abstract
The invention provides a pipe bending device, which comprises a shell, wherein the middle part of the shell is rotatably connected with a driven shaft which is vertically arranged in the axial direction, the upper end of the driven shaft sequentially penetrates through the top of the shell and a workbench and then is connected with a guide wheel, and one end of the workbench is provided with a bending wheel which is matched with the guide wheel to perform pipe bending operation; when the steel pipe is bent, the steel pipe penetrates through a space between the guide wheel and the wheel groove of the bending wheel, and the driven shaft is driven to rotate, so that the workbench, the guide wheel and the bending wheel on the workbench can be driven to rotate around the axial center of the driven shaft, and the steel pipe is bent; the automatic bending machine adopts a combined design structure that the oil cylinder drives the workbench to rotate through gear transmission, can realize automatic bending of steel pipes, reduces the labor intensity of workers, is convenient for guaranteeing the quality of bent pipes, is convenient for adapting to bending operation of steel pipes with different bending radii or different sizes by combining the adjustable position of a mandrel seat on the workbench, and has simple and compact integral structure and low manufacturing cost; it is widely suitable for the bending production of pipe fittings.
Description
Technical Field
The invention relates to pipe bending processing production equipment, in particular to a pipe bending device.
Background
The steel pipe can be used for conveying fluid and can also be used as a support frame; the steel pipe often needs certain radian in-service use, the traditional mode adopts manual return bend, there is inefficiency, shape stability is not good after the bending, the quality of return bend operation has been reduced, and there are bulky in automation equipment such as current numerical control bending machine or hydraulic pressure bending machine, the structure is complicated, the cost of manufacture scheduling problem, current automation bending machine is when changing leading wheel and bending wheel to the steel pipe of different size models simultaneously, the operation is inconvenient, can't satisfy user's production demand.
Disclosure of Invention
In view of the above situation, the present invention aims to provide a pipe bending apparatus, which adopts a combined design structure that an oil cylinder drives a workbench to rotate through gear transmission, can realize automatic bending of steel pipes, is favorable for reducing labor intensity, improving production efficiency, ensuring pipe bending quality, is convenient for adapting to bending operations of steel pipes with different bending radii or different sizes by combining adjustable space between a mandrel seat and a driven shaft on the workbench, has scientific, reasonable, simple and compact overall structure, is convenient to install and operate, can meet production requirements of users, and has wide market prospect, and is convenient for popularization and use.
In order to achieve the purpose, the pipe bending device comprises a shell, wherein the middle part of the shell is rotatably connected with a driven shaft which is vertically arranged in the axial direction, the upper end of the driven shaft sequentially penetrates through the top of the shell and a workbench and then is connected with a guide wheel, and one end of the workbench is provided with a bending wheel which is matched with the guide wheel to perform pipe bending operation; when the steel pipe is bent, the steel pipe penetrates through the wheel groove between the guide wheel and the bending wheel, and the driven shaft is driven to rotate, so that the workbench, the guide wheel and the bending wheel on the workbench can be driven to rotate around the axial center of the driven shaft, and the steel pipe is bent.
In order to realize the optimization of the structure and the effect, the further measures are as follows: one side of the driven shaft in the shell is rotatably connected with a driving shaft which is vertically arranged in the axial direction, a driving gear is arranged at the lower end of the driving shaft in the shell, and the driving gear is in meshing transmission with a driven gear arranged at the lower end of the driven shaft.
The bottom surface of the shell is connected with an oil cylinder, a piston rod of the oil cylinder is connected with a rack through a connecting plate, the bottom end of the driving shaft, which extends out of the bottom of the shell, is connected with a transmission gear, and the transmission gear is in meshing transmission with the rack; when the oil cylinder pushes the piston rod to act, the rack can move along with the piston rod, and the driving shaft can be driven to rotate through the transmission gear.
Still rotate in the casing and be connected with the manual axis of the vertical setting of axial, the lower extreme that manual axis is located the casing is equipped with manual gear and driving gear meshing transmission, the upper end of manual axis stretches out the casing top and is connected with manual wheel.
The workbench comprises a table top plate, one end of the table top plate is provided with a through hole for connecting a driven shaft, the upper plane of the other end of the table top plate is provided with a groove for assembling a mandrel seat, the upper end of the mandrel seat is connected with a bending wheel, the outer side of the mandrel seat is sequentially provided with a baffle plate, a screw rod and a locking hand wheel, one end of the screw rod is connected with the locking hand wheel, and the other end of the screw rod penetrates through the baffle plate to be connected with the mandrel seat; by rotating the locking hand wheel, the mandrel seat can slide in the groove of the table board through the screw rod, so that the axial distance between the mandrel seat and the driven shaft can be adjusted.
The workbench is also provided with a transverse pressing plate and a longitudinal pressing plate which are respectively connected with the end faces of the two transverse sides and the end face of the outer side of the groove on the table panel.
One side of the shell is provided with a fixing clamp seat for clamping a steel pipe, and two ends of the fixing clamp seat are respectively provided with an adjusting hand wheel.
The top of casing is equipped with the apron, the upper surface of apron is equipped with the scale mark and is used for measuring the return bend angle.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, a combined design structure that the oil cylinder can drive the guide wheel and the bending wheel on the workbench to rotate through gear transmission is adopted, so that the automatic pipe bending operation of the steel pipe between the guide wheel and the bending wheel is realized, the time and the labor are saved, the manual labor intensity is reduced, and the production efficiency is effectively improved;
the invention (II) adopts a structure that the mandrel seat can slide in the groove of the table board, and the axial distance between the mandrel seat and the driven shaft can be adjusted by rotating the locking hand wheel, so that the bending machine is convenient to adapt to the bending operation of steel pipes with different bending radiuses or different sizes, has simple and compact integral structure, small volume, low manufacturing cost and convenient installation and operation, and can meet the production requirements of users;
according to the invention, the oil cylinder is adopted to drive the driven shaft to rotate through gear transmission, so that the workbench, the guide wheel and the bending wheel on the workbench can rotate around the axial center of the driven shaft, the bending wheel can rotate around the axial center during bending, the angle of the bent pipe can be controlled accurately, the forming quality of the bent pipe is effectively ensured, and the problem that the bent pipe is easy to rebound after forming due to the fact that the bending wheel cannot rotate in the prior art is solved;
(IV) the invention adopts a combined design structure that the oil cylinder drives the workbench to rotate through gear transmission, can realize automatic steel pipe bending, is beneficial to reducing the labor intensity of workers, improving the production efficiency and ensuring the pipe bending quality, is convenient to adapt to the bending operation of steel pipes with different bending radiuses or different sizes by combining the adjustable distance between the mandrel seat and the driven shaft on the workbench, has scientific, reasonable, simple and compact integral structure, convenient installation and operation, can meet the production requirements of users, and has remarkable economic benefit and social benefit.
The invention is widely suitable for the matched use in the bending production of pipe fittings.
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention.
Fig. 1 is a schematic view of the overall structure of the present invention.
Fig. 2 is a schematic diagram of the transmission structure of the present invention.
Fig. 3 is a cross-sectional view of the transmission structure of the present invention.
Fig. 4 is a schematic bottom structure of the present invention.
FIG. 5 is a schematic view of the pipe bending operation of the present invention.
Fig. 6 is a schematic view of the installation structure of the workbench according to the present invention.
In the figure: 1-a steel pipe, 2-a fixed clamp holder, 21-an adjusting hand wheel, 3-a bending wheel, 4-a workbench, 41-a locking hand wheel, 42-a table board, 43-a baffle, 44-a screw rod, 45-a mandrel seat, 46-a longitudinal pressing plate, 47-a transverse pressing plate, 48-a through hole, 5-a cover plate, 51-a scale mark, 6-an oil cylinder, 61-a piston rod, 62-a connecting plate, 621-a rack, 63-an oil port, 7-a guide wheel, 8-a manual wheel, 9-a shell, 91-a driven gear, 92-a driving gear, 93-a manual gear, 94-a manual shaft, 95-a driving shaft, 96-a driven shaft and 97-a transmission gear.
Detailed Description
Referring to fig. 1 to 6, the present invention is realized by: a pipe bending device comprises a shell 9, wherein the middle part of the shell 9 is rotatably connected with a driven shaft 96 which is vertically arranged in the axial direction, the upper end of the driven shaft 96 sequentially penetrates through the top of the shell 9 and a workbench 4 and then is connected with a guide wheel 7, and one end of the workbench 4 is provided with a bending wheel 3 which is matched with the guide wheel 7 to perform pipe bending operation; during pipe bending, the steel pipe 1 passes through the wheel groove between the guide wheel 7 and the bending wheel 3, and the driven shaft 96 is driven to rotate, so that the workbench 4, the guide wheel 7 and the bending wheel 3 on the workbench can be driven to rotate around the axial center of the driven shaft 96, and the steel pipe bending is realized.
Referring to fig. 1 to 6, in the present invention, a driving shaft 95 is rotatably connected to one side of a driven shaft 96 in a housing 9, the driving shaft 95 is provided with a driving gear 92 at a lower end in the housing 9, and the driving gear 92 is in meshing transmission with a driven gear 91 provided at a lower end of the driven shaft 96; the bottom surface of the shell 9 is connected with an oil cylinder 6, a piston rod 61 of the oil cylinder 6 is connected with a rack 621 through a connecting plate 62, the bottom end of the driving shaft 95 extending out of the bottom of the shell 9 is connected with a transmission gear 97, and the transmission gear 97 is in meshing transmission with the rack 621; when the oil cylinder 6 pushes the piston rod 61 to act, the rack 621 can move along with the piston rod, the driving gear 97 can drive the driving shaft 95 to rotate, and the driving gear 92 rotates along with the driving shaft 95 and drives the driven shaft 96 to rotate through the meshed driven gear 91, so that the workbench 4 is driven to rotate to realize automatic pipe bending operation; a manual shaft 94 which is vertically arranged in the axial direction is rotatably connected in the shell 9, a manual gear 93 and a driving gear 92 are arranged at the lower end of the manual shaft 94 in the shell 9 and are in meshing transmission, the upper end of the manual shaft 94 extends out of the top of the shell 9 and is connected with the manual wheel 8, the manual wheel 8 is driven to rotate by an inserted force applying rod, the driving gear 92 can be driven to rotate by the manual gear 93, and a driven shaft 96 and the workbench 4 are driven to rotate along with the driven gear 91 which is meshed, so that manual pipe bending operation is realized, when the oil cylinder 6 breaks down or other field operation occurs, pipe bending operation can be performed in a manual mode, the purpose of integrating automatic operation and manual operation is achieved, the use requirements of different conditions are conveniently met, and the requirements of users are met; the top of casing 9 is equipped with apron 5, the upper surface of apron 5 is equipped with scale mark 51 and is used for measuring the return bend angle, utilizes visual scale mark 51, accurate control return bend angle when making things convenient for manual return bend operation.
As shown in fig. 1 to 6, the workbench 4 of the present invention comprises a table top 42, one end of the table top 42 is provided with a through hole 48 for connecting with a driven shaft 96, the other end of the table top 42 is provided with a groove on the upper plane for assembling a mandrel base 45, the upper end of the mandrel base 45 is used for connecting with the bending wheel 3, the outer side of the mandrel base 45 is sequentially provided with a baffle 43, a screw 44 and a locking hand wheel 41, one end of the screw 44 is connected with the locking hand wheel 41, and the other end of the screw 44 passes through the baffle 43 and is connected with the mandrel base 45; the locking hand wheel 41 is rotated, the mandrel seat 45 can slide in the groove of the table board 42 through the screw 44, the axial distance between the mandrel seat 45 and the driven shaft 96 is adjusted, and the bending operation of steel pipes with different bending radiuses or different sizes and models is convenient to adapt; the press bending wheel 3 and the mandrel seat 45 are assembled in a clearance mode, so that the press bending wheel 3 can be replaced conveniently and quickly, and meanwhile, the press bending wheel 3 can rotate around the mandrel seat 45 conveniently; the workbench 4 is further provided with a transverse pressing plate 47 and a longitudinal pressing plate 46 which are respectively connected with the end faces of the two transverse sides and the end face of the outer side of the groove on the table board 42 and used for accurately positioning the mandrel base 45 and avoiding the mandrel base 45 from sliding in the pipe bending process; one side of casing 9 is equipped with fixed holder 2 and is used for centre gripping steel pipe 1, the both ends of fixed holder 2 are equipped with adjusting hand wheel 21 respectively, and the adjustable opening and shutting clearance size of fixed holder 2 and the clamping center of steel pipe 1 through the adjusting hand wheel 21 of rotatory both ends ensure that steel pipe 1 is the straight line and passes between fixed holder 2 and leading wheel 7 and the wheel 3 that bends.
With reference to fig. 1 to 6, the working flow of the present invention is as follows: firstly, selecting a proper guide wheel and a proper bending wheel according to the size of the radius of the bent pipe and the size of the diameter of the steel pipe, and adjusting the distance between the bending wheel and the guide wheel through a locking hand wheel so as to meet the requirement of the bending radius; then, the steel pipe linearly passes through the fixed clamping seat and the wheel grooves of the guide wheel and the bending wheel, and is clamped by rotating adjusting hand wheels at two ends of the fixed clamping seat; then starting the oil cylinder, pushing the piston rod to act by pressurizing through the oil port, enabling the rack to move along with the piston rod, driving the driving shaft to rotate through the transmission gear, driving the driving gear to rotate along with the driving shaft and driving the driven shaft to rotate through the meshed driven gear, so that the guide wheel, the workbench and the bending wheel are driven to rotate around the driven shaft, and the steel pipe is bent, and meanwhile, the bending wheel and the steel pipe rub to enable the bending wheel to rotate around the mandrel base, so that the bending quality is guaranteed; the angle of the bent pipe is generally realized by controlling the stroke of the piston rod of the oil cylinder, when the piston rod of the oil cylinder is pushed outwards by 50 mm, the transmission gear can be driven by the rack to rotate for a circle, and the driven shaft and the workbench can be driven to rotate by 30 degrees through the meshing transmission of the driving gear and the driven gear, namely the angle of the bent pipe is 30 degrees; the integral operation is simple and convenient, the equipment volume is small, the movement is convenient, the production requirement of small-batch special-shaped pipe bending pieces is met, and the problems of large volume, complex structure and high manufacturing cost of the existing automatic operation equipment such as a numerical control pipe bending machine or a hydraulic pipe bending machine are solved.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can be considered to be within the technical scope of the present invention, and equivalent substitutions or changes according to the technical solution and the concept of the present invention should be included in the scope of the present invention.
Claims (8)
1. A pipe bending device is characterized by comprising a shell (9), wherein the middle part of the shell (9) is rotatably connected with a driven shaft (96) which is vertically arranged in the axial direction, the upper end of the driven shaft (96) sequentially penetrates through the top of the shell (9) and a workbench (4) and then is connected with a guide wheel (7), and one end of the workbench (4) is provided with a bending wheel (3) which is matched with the guide wheel (7) to perform pipe bending operation; during pipe bending, the steel pipe (1) penetrates through the wheel grooves of the guide wheel (7) and the bending wheel (3), and the driven shaft (96) is driven to rotate, so that the workbench (4), the guide wheel (7) and the bending wheel (3) on the workbench can be driven to rotate around the axial center of the driven shaft (96), and the steel pipe bending is achieved.
2. The pipe bending device according to claim 1, wherein an axially vertically arranged driving shaft (95) is rotatably connected to one side of the driven shaft (96) in the housing (9), a driving gear (92) is arranged at the lower end of the driving shaft (95) in the housing (9), and the driving gear (92) is in meshing transmission with a driven gear (91) arranged at the lower end of the driven shaft (96).
3. The pipe bending device according to claim 2, wherein the bottom surface of the housing (9) is connected with an oil cylinder (6), a piston rod (61) of the oil cylinder (6) is connected with a rack (621) through a connecting plate (62), the bottom end of the driving shaft (95) extending out of the bottom of the housing (9) is connected with a transmission gear (97), and the transmission gear (97) is in meshing transmission with the rack (621); when the oil cylinder (6) pushes the piston rod (61) to act, the rack (621) can move along with the piston rod, and the driving shaft (95) can be driven to rotate by the transmission gear (97).
4. The pipe bending device according to claim 2, characterized in that a manual shaft (94) which is vertically arranged in the axial direction is further rotatably connected in the housing (9), a manual gear (93) which is meshed with the driving gear (92) and is arranged at the lower end of the manual shaft (94) in the housing (9) for transmission, and the upper end of the manual shaft (94) extends out of the top of the housing (9) to be connected with the manual wheel (8).
5. The pipe bending device according to claim 1, wherein the workbench (4) comprises a table board (42), one end of the table board (42) is provided with a through hole (48) for connecting with a driven shaft (96), the upper plane of the other end of the table board (42) is provided with a groove for assembling a mandrel seat (45), the upper end of the mandrel seat (45) is used for connecting with the bending wheel (3), the outer side of the mandrel seat (45) is sequentially provided with a baffle plate (43), a screw rod (44) and a locking hand wheel (41), one end of the screw rod (44) is connected with the locking hand wheel (41), and the other end of the screw rod (44) passes through the baffle plate (43) and is connected with the mandrel seat (45); by rotating the locking hand wheel (41), the mandrel seat (45) can slide in the groove of the table board (42) through the screw (44), and the axial distance between the mandrel seat (45) and the driven shaft (96) is adjusted.
6. The pipe bending device according to claim 5, wherein the table (4) is further provided with a transverse pressing plate (47) and a longitudinal pressing plate (46) for connecting with the transverse both side end surfaces and the outer side end surfaces of the groove on the table plate (42), respectively.
7. The pipe bending device according to claim 1, wherein a fixing clamp seat (2) is arranged on one side of the housing (9) and used for clamping the steel pipe (1), and adjusting hand wheels (21) are respectively arranged at two ends of the fixing clamp seat (2).
8. The elbow device according to claim 1, characterized in that the top of the housing (9) is provided with a cover plate (5), and the upper surface of the cover plate (5) is provided with scale marks (51) for measuring the elbow angle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111579479.5A CN114247784A (en) | 2021-12-22 | 2021-12-22 | Pipe bending device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111579479.5A CN114247784A (en) | 2021-12-22 | 2021-12-22 | Pipe bending device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114247784A true CN114247784A (en) | 2022-03-29 |
Family
ID=80794214
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111579479.5A Pending CN114247784A (en) | 2021-12-22 | 2021-12-22 | Pipe bending device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114247784A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114749529A (en) * | 2022-05-07 | 2022-07-15 | 宣城银明汽车部件制造有限公司 | Pipe bending mould of gas air conditioner breather pipe |
| CN117259518A (en) * | 2023-11-21 | 2023-12-22 | 成都源流立创科技有限公司 | Pipe bending device and method for precisely controlling pipe bending angle |
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| US5203192A (en) * | 1991-02-15 | 1993-04-20 | Kabushiki Kaisha Ogura | Portable, lightweight machine for bending reinforcing steel rods or the like |
| DE202006001511U1 (en) * | 2006-02-01 | 2006-03-23 | Yih Shen Machiner Co., Ltd., Wuri Shiang | Pipe and cable bending machine has first servo-motor rotating eccentric shaft, on which cantilever arm is mounted carrying cutter, second servo-motor moving cutter and three additional servo-motors controlling movement of bending tools |
| WO2008046385A1 (en) * | 2006-10-17 | 2008-04-24 | Christoph Lamowski | Pipe bending device |
| KR101491559B1 (en) * | 2014-08-19 | 2015-02-09 | 주식회사 삼보산업 | Manual operation apparatus of valve actuator |
| CN107350316A (en) * | 2016-05-09 | 2017-11-17 | 金成铜 | Utilize the portable tube bending machine of hydraulic pressure |
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| CN213826536U (en) * | 2020-09-18 | 2021-07-30 | 无锡金羊管件有限公司 | Steel pipe bending machine |
-
2021
- 2021-12-22 CN CN202111579479.5A patent/CN114247784A/en active Pending
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| US5203192A (en) * | 1991-02-15 | 1993-04-20 | Kabushiki Kaisha Ogura | Portable, lightweight machine for bending reinforcing steel rods or the like |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114749529A (en) * | 2022-05-07 | 2022-07-15 | 宣城银明汽车部件制造有限公司 | Pipe bending mould of gas air conditioner breather pipe |
| CN117259518A (en) * | 2023-11-21 | 2023-12-22 | 成都源流立创科技有限公司 | Pipe bending device and method for precisely controlling pipe bending angle |
| CN117259518B (en) * | 2023-11-21 | 2024-02-23 | 成都源流立创科技有限公司 | Pipe bending device and method for precisely controlling pipe bending angle |
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