CN214579309U - Hydraulic engineering is pipeline strutting arrangement for river course transformation - Google Patents
Hydraulic engineering is pipeline strutting arrangement for river course transformation Download PDFInfo
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- CN214579309U CN214579309U CN202120186431.7U CN202120186431U CN214579309U CN 214579309 U CN214579309 U CN 214579309U CN 202120186431 U CN202120186431 U CN 202120186431U CN 214579309 U CN214579309 U CN 214579309U
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Abstract
The utility model discloses a pipeline supporting device for hydraulic engineering river channel reconstruction, which comprises a supporting mechanism arranged on a fixed plate, wherein the supporting mechanism comprises a first supporting plate fixedly connected on the fixed plate and a second supporting plate connected on the fixed plate in a sliding way, the second supporting plate slides on the fixed plate and is close to or far away from the first supporting plate, so as to form supports for different positions of the pipeline, three mutually independent arc-shaped plates are respectively arranged at the middle positions of the first supporting plate and the second supporting plate, the arc-shaped plate close to the fixed plate is fixedly connected on the first supporting plate and the second supporting plate, all the other two arcs can be followed its radial outside or inside removal, and can follow vertical removal to constitute the dismantlement and the fixing to the pipeline, the utility model discloses simple structure, convenient operation is favorable to installing or dismantling the pipeline, and is stronger to the stable form that the pipeline supported. Is suitable for the technical field of hydraulic engineering.
Description
Technical Field
The utility model belongs to the technical field of hydraulic engineering, specifically speaking relates to a hydraulic engineering is pipeline strutting arrangement for river course transformation.
Background
Hydraulic engineering river channel reconstruction is an engineering measure for controlling and reconstructing river channels. The phenomena of scouring and silting frequently occur in natural rivers, water damage easily occurs, and the development of water conservancy is hindered. In order to meet the requirements of removing troubles and benefiting, proper measures are required to be taken to renovate the river channel, including projects such as dredging, dredging and bank protection, the pipeline is used for circulating water or replenishing water to the river, the existing pipeline supporting device is not favorable for the installation or maintenance of the pipeline, the pipeline is not convenient to disassemble and install, and the stable supporting performance of the supporting device to the pipeline supporting is poor.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a hydraulic engineering is pipeline strutting arrangement for river course transformation just in order to solve above-mentioned problem.
The utility model realizes the above purpose through the following technical proposal, and the pipeline supporting device for the hydraulic engineering river channel reconstruction has the key points that the pipeline supporting device comprises a supporting mechanism which is arranged on a fixed plate and is used for supporting a pipeline, the supporting mechanism comprises a first supporting plate fixedly connected on the fixing plate and a second supporting plate connected on the fixing plate in a sliding way, the second supporting plate slides on the fixing plate and is close to or far away from the first supporting plate, so as to form supports for different positions of the pipeline, three mutually independent arc-shaped plates are respectively arranged at the middle positions of the first supporting plate and the second supporting plate, the arc-shaped plate close to the fixed plate is fixedly connected on the first supporting plate and the second supporting plate, the other two arc plates can move outwards or inwards along the radial direction of the arc plates and can move vertically so as to disassemble and fix the pipeline.
Preferably, the both ends of first backup pad and second backup pad are respectively along vertical upwards extending there are two risers, and are same two in the first backup pad and the second backup pad the riser inboard has linked firmly vertical slide rail, sliding connection has the slider in the vertical slide rail, the slider links firmly the telescopic machanism who is used for making the arc along its radial movement who links firmly with the arc, it has the actuating mechanism who is used for adjusting its gliding to construct on the slider.
Preferably, telescopic machanism including link firmly in fixed block on the slider, the fixed block have rather than corresponding the tangent inclined plane of arc, in the inclined plane of fixed block links firmly perpendicularly on with the arc drive actuating cylinder of being connected, the cylinder body that drives actuating cylinder link firmly in on the fixed block, the telescopic link that drives actuating cylinder link firmly in on the arc.
Preferably, the driving mechanism comprises two driving motors fixedly mounted on the first supporting plate and the second supporting plate respectively, and output shafts of the driving motors are connected with lead screws penetrating through the fixing blocks and in threaded connection with the fixing blocks through shaft coupling transmission.
Preferably, the arc-shaped surface of the arc-shaped plate close to the pipeline is fixedly connected with a rubber pad matched with the pipeline, and a strip-shaped bulge is formed on the arc-shaped surface of the rubber pad contacted with the pipeline.
Preferably, the arc-shaped plate fixedly connected with the fixed plate extends downwards to form a fixed seat, and the fixed seat is fixedly connected with a buffer unit between the first supporting plate and the second supporting plate respectively.
Preferably, the buffer unit includes a buffer spring, a sliding limiting rod is arranged on the first support plate and the second support plate and extends upwards around the buffer spring, a sliding limiting hole corresponding to the sliding limiting rod is vertically formed in the bottom of the fixing seat, and the sliding limiting rod slides in the sliding limiting hole.
Preferably, the fixed plate is fixedly connected with two slide rails in sliding connection with the second support plate, a sliding groove matched with the slide rails penetrates through the bottom of the second support plate, and a limiting unit used for limiting the second support plate to slide is constructed between the second support plate and the fixed plate.
Preferably, the limiting unit comprises a mounting plate fixedly connected to the middle of the second support plate, a locking hole penetrates through the mounting plate, a plurality of threaded holes are formed in the middle of the fixing plate at intervals, the arrangement direction of each threaded hole is consistent with the sliding direction of the second support plate, and a locking bolt penetrates through the locking hole and is in threaded connection with one threaded hole to form fixation of the second support plate.
Preferably, the bottom of the fixed plate is provided with a U-shaped base, and a driving hydraulic cylinder for adjusting the height of the fixed plate is fixedly connected between the fixed plate and the U-shaped base.
The utility model discloses owing to adopted foretell structure, it compares with prior art, and the technical progress who gains lies in: the utility model discloses a supporting mechanism of setting on the fixed plate, supporting mechanism are used for supporting the pipeline in the river course, and supporting mechanism includes first backup pad and second backup pad, and first backup pad fixed connection is on the fixed plate, and second backup pad sliding connection is on the fixed plate, and the second backup pad can slide on the fixed plate, is close to or keeps away from first backup pad, adjusts the distance of first backup pad and second backup pad to the support position of adjustment pipeline, in order to reach more stable support, and the utility model discloses can set up a plurality of second backup pads according to pipeline length and actual demand, adjust the distance between a plurality of second backup pads, thereby more stable support pipeline; three arc-shaped plates are respectively arranged at the middle positions of the first supporting plate and the second supporting plate, the three arc-shaped plates are mutually independent and have consistent axes, the arc-shaped plate close to the fixed plate is fixedly connected on the first supporting plate and the second supporting plate, the other two arc plates can move outwards or inwards along the diameter direction of the arc plates and can move vertically, when the pipeline is fixed by the utility model, firstly, the two arc-shaped plates are adjusted to move outwards along the diameter direction of the two arc-shaped plates, and the two arc-shaped plates are enabled to move downwards along the vertical direction, secondly, the pipeline is put on the arc-shaped plates fixedly connected with the fixed plate, finally, the other two arc-shaped plates are adjusted to move upwards along the vertical direction, the two arc-shaped plates are moved inwards along the diameter direction of the two arc-shaped plates until the axes of the three arc-shaped plates are overlapped and the pipeline is clamped in the arc-shaped plates, so that the pipeline is fixed; when the pipeline needs to be disassembled for maintenance, the two arc-shaped plates are adjusted to move outwards along the diameter direction of the two arc-shaped plates, the two arc-shaped plates are made to move downwards along the vertical direction, and then the pipeline is separated from the arc-shaped plates; the utility model discloses simple structure, convenient operation is favorable to installing or dismantling the pipeline, and is stronger to the stable form that the pipeline supported.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of an embodiment of the present invention;
fig. 2 is an exploded view of the fixing plate and the second supporting plate according to the embodiment of the present invention;
FIG. 3 is an exploded view of the slider and the vertical slide rail in the embodiment of the present invention;
FIG. 4 is an exploded view of the fixing base and the sliding position limiting rod according to the embodiment of the present invention;
fig. 5 is a side view of an embodiment of the invention;
fig. 6 is an enlarged view of a portion a in fig. 5.
In the figure: 1. the fixed plate, 2, first backup pad, 3, the second backup pad, 4, the arc, 5, the riser, 6, vertical slide rail, 7, the slider, 8, the fixed block, 9, drive actuating cylinder, 10, driving motor, 11, the shaft coupling, 12, the lead screw, 13, the rubber pad, 14, the fixing base, 15, buffer spring, 16, the gag lever post that slides, 17, the spacing hole that slides, 18, the slide rail, 19, the spout, 20, the mounting panel, 21, the screw hole, 22, the locking bolt, 23, U type base, 24, drive the pneumatic cylinder.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the drawings in the embodiments of the present invention are combined below to clearly and completely describe the technical solutions in the embodiments of the present invention, and obviously, the embodiments described below are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.
Embodiment is pipeline strutting arrangement for hydraulic engineering river course is reformed transform
Referring to fig. 1-6, a pipe supporting device for hydraulic engineering river channel improvement includes a supporting mechanism disposed on a fixing plate 1, the supporting mechanism is used for supporting a pipe in a river channel, the supporting mechanism includes a first supporting plate 2 and a second supporting plate 3, the first supporting plate 2 is fixedly connected to the fixing plate 1, the second supporting plate 3 is slidably connected to the fixing plate 1, the second supporting plate 3 can slide on the fixing plate 1 and approach or depart from the first supporting plate 2, and the distance between the first supporting plate 2 and the second supporting plate 3 is adjusted, so as to adjust the supporting position of the pipe, so as to achieve more stable support, and in this embodiment, a plurality of second supporting plates 3 can be disposed according to the length of the pipe and the actual requirement, so as to adjust the distance between the plurality of second supporting plates 3, so as to support the pipe more stably; three arc plates 4 are respectively arranged at the middle positions on the first supporting plate 2 and the second supporting plate 3, the three arc plates 4 are independent from each other and have the same axis, the arc plate 4 close to the fixed plate 1 is fixedly connected on the first supporting plate 2 and the second supporting plate 3, the other two arc plates 4 can move outwards or inwards along the diameter direction of the fixed plate and can move along the vertical direction, when the pipeline is fixed in the embodiment, firstly, the two arc plates 4 are adjusted to move outwards along the diameter direction of the fixed plate and the two arc plates 4 are enabled to move downwards along the vertical direction, secondly, the pipeline is put on the arc plate 4 fixedly connected with the fixed plate 1, finally, the other two arc plates 4 are adjusted to move upwards along the vertical direction, and the two arc plates 4 are enabled to move inwards along the diameter direction to the axes of the three arc plates 4 to be overlapped and the pipeline is clamped in the arc plates 4, thereby completing the fixation of the pipeline; when the pipeline needs to be disassembled for maintenance, firstly, the two arc-shaped plates 4 are adjusted to move outwards along the diameter direction of the two arc-shaped plates, the two arc-shaped plates 4 are made to move downwards along the vertical direction, and then the pipeline is separated from the arc-shaped plates 4; this embodiment simple structure, convenient operation is favorable to installing or dismantling the pipeline, and is stronger to the stable form that the pipeline supported.
In the embodiment, two vertical plates 5 are respectively formed at two ends of a first supporting plate 2 and a second supporting plate 3, the two vertical plates 5 extend upwards along a vertical direction, vertical slide rails 6 are fixedly connected to the inner sides of the two vertical plates 5 on the same first supporting plate 2 and the second supporting plate 3, sliders 7 are slidably connected to the vertical slide rails 6, the sliders 7 are fixedly connected with a telescopic mechanism, the telescopic mechanism is fixedly connected with an arc plate 4 and is used for adjusting the arc plate 4 to move along the diameter direction of the arc plate, a driving mechanism is constructed on the sliders 7 and adjusts the sliders 7 to slide along the vertical direction in the vertical slide rails 6, the telescopic mechanism has the specific structure that the telescopic mechanism comprises a fixed block 8 fixedly connected to the sliders 7, the fixed block 8 is provided with an inclined surface, the inclined surface is tangent to the outer cambered surface of the arc plate 4 corresponding to the fixed block 8, and a driving cylinder 9 is vertically and fixedly connected to the inclined surface of the fixed block 8, the cylinder body of the driving cylinder 9 is fixedly connected to the fixed block 8, the telescopic rod of the driving cylinder 9 is fixedly connected to the arc-shaped plates 4, the driving mechanism comprises two driving motors 10 respectively fixedly mounted on the first supporting plate 2 and the second supporting plate 3, the output shaft of the driving motor 10 is in transmission connection with a lead screw 12 through a shaft coupling 11, the lead screw 12 penetrates through the fixed block 8 and is in threaded connection with the fixed block 8, when the pipeline is fixed, the two arc-shaped plates 4 are adjusted to move outwards along the diameter direction of the pipeline through the driving cylinder 9, the lead screw 12 is driven to rotate through the rotation of the driving motor 10, the lead screw 12 drives the fixed block 8 to move along the vertical direction, so that the two arc-shaped plates 4 move downwards along the vertical direction, then the pipeline is placed on the arc-shaped plates 4 fixedly connected with the fixed plate 1, and finally, the other two arc-shaped plates 4 are adjusted to move upwards along the vertical direction, the two arc-shaped plates 4 are moved inwards along the diameter direction of the two arc-shaped plates to enable the axes of the three arc-shaped plates 4 to be overlapped and the pipeline to be clamped in the arc-shaped plates 4, so that the pipeline is fixed; when needing to dismantle to pipeline maintenance, earlier outwards remove along its diameter direction through driving two arcs of actuating cylinder 9 adjustment 4 to drive lead screw 12 through driving motor 10, lead screw 12 drives fixed block 8, thereby makes two arcs 4 along vertical direction downstream, then breaks away from out on the arc 4 with the pipeline.
The rubber pad 13 is fixedly connected to the arc-shaped surface, close to the pipeline, of the arc-shaped plate 4 in the embodiment, the rubber pad 13 is matched with the pipeline, and the strip-shaped protrusions are formed on the arc-shaped surface, in contact with the pipeline, of the rubber pad 13; in this embodiment, the arc plate 4 fixedly connected to the fixing plate 1 extends downward to form a fixing seat 14, in order to reduce the stress of the arc plate 4 during the installation of the pipeline and prevent the impact force between the pipeline and the arc plate 4 from being too large, buffer units are fixedly connected between the fixing seat 14 and the first support plate 2 and between the fixing seat 14 and the second support plate 3, the buffer units include buffer springs 15, in order to prevent the mutual dislocation between the fixing seat 14 and the first support plate 2 and between the fixing seat 14 and the second support plate 3 and cause instability of the fixing seat 14, sliding limiting rods 16 extend on the first support plate 2 and the second support plate 3 and around the buffer springs 15, sliding limiting holes 17 corresponding to the sliding limiting rods 16 are formed in the bottom of the fixing seat 14 along the vertical direction, the sliding limiting rods 16 slide in the sliding limiting holes 17, and by arranging the sliding limiting rods 16 and the sliding limiting holes 17, so that the arc-shaped plate 4 on the fixed seat 14 is more stable with the first supporting plate 2 and the second supporting plate 3 respectively.
In this embodiment, two slide rails 18 are fixedly connected to the fixing plate 1, the cross section of each slide rail 18 is i-shaped, a sliding groove 19 matched with the i-shaped slide rail 18 penetrates through the bottom of the second support plate 3, a limiting unit is constructed between the second support plate 3 and the fixing plate 1 and used for limiting the sliding of the second support plate 3, the limiting unit has a specific structure that the limiting unit comprises a mounting plate 20, the mounting plate 20 is fixedly connected to the middle of the second support plate 3, a locking hole penetrates through the mounting plate 20, a plurality of threaded holes 21 are formed in the middle of the fixing plate 1 at intervals, the arrangement direction of each threaded hole 21 is consistent with the sliding direction of the second support plate 3, and one locking bolt 22 penetrates through the locking hole and is in threaded connection with one of the threaded holes 21, so as to complete the fixing of the second support plates 3, in this embodiment, a plurality of second support plates 3 can be arranged according to the length of a pipeline and actual requirements, the distance between a plurality of second backup pads 3 is adjusted to more stable support pipeline through setting up locking bolt 22 fixed second backup pad 3 and fixed plate 1, and is fixed convenient, through setting up I shape slide rail 18, and second backup pad 3 slides conveniently, and the practicality is strong.
In this embodiment, the bottom of fixed plate 1 is provided with U type base 23, fixedly connected with drives hydraulic cylinder 24 between fixed plate 1 and the U type base 23, 1 sliding connection of fixed plate is inside U type base 23, the actuating lever of fixedly connected with drive hydraulic cylinder 24 is located to the centre of the bottom of fixed plate 1, the cylinder body of centre fixedly connected with drive hydraulic cylinder 24 is located on the inner wall of U type base 23 bottom, drive hydraulic cylinder 24 and adjust fixed plate 1 and remove along vertical direction, when needs installation pipeline, adjust the height of fixed plate 1 through driving hydraulic cylinder 24, make things convenient for operating personnel to the installation or the dismantlement of pipeline.
It is well within the skill of those in the art to implement, without undue experimentation, the present invention does not relate to software and process improvements, as related to circuits and electronic components and modules.
It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
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 technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (10)
1. The utility model provides a hydraulic engineering is pipeline strutting arrangement for river course transformation which characterized in that: including setting up the supporting mechanism who is used for supporting the pipeline on the fixed plate, supporting mechanism including link firmly in first backup pad and the second backup pad of sliding connection on the fixed plate, the second backup pad in slide on the fixed plate, be close to or keep away from first backup pad to constitute the support to the different positions of pipeline, intermediate position department in first backup pad and the second backup pad is provided with three mutually independent arc respectively, is close to the arc of fixed plate link firmly in on first backup pad and the second backup pad, all the other two its radial outside or inside removal can be followed to the arc, and can follow vertical removal to constitute the dismantlement and the fixing of pipeline.
2. The pipeline supporting device for the hydraulic engineering river channel improvement according to claim 1, wherein: the both ends of first backup pad and second backup pad are respectively along vertical upwards extending there are two risers, same two in first backup pad and the second backup pad the riser inboard has linked firmly vertical slide rail, sliding connection has the slider in the vertical slide rail, the slider links firmly and is used for making the telescopic machanism of arc along its radial movement with the arc links firmly, the structure has the actuating mechanism who is used for adjusting its gliding on the slider.
3. The pipeline supporting device for the hydraulic engineering river channel improvement according to claim 2, wherein: telescopic machanism including link firmly in fixed block on the slider, the fixed block have rather than corresponding the tangent inclined plane of arc, in the inclined plane of fixed block links firmly perpendicularly on with the arc drive actuating cylinder of being connected, the cylinder body that drives actuating cylinder link firmly on the fixed block, the telescopic link that drives actuating cylinder link firmly in on the arc.
4. The pipeline supporting device for the hydraulic engineering river channel improvement according to claim 3, wherein: the driving mechanism comprises two driving motors which are fixedly installed on the first supporting plate and the second supporting plate respectively, and output shafts of the driving motors are connected with lead screws which penetrate through the fixing blocks and are in threaded connection with the fixing blocks through shaft coupling transmission.
5. The pipeline supporting device for the hydraulic engineering river channel improvement according to claim 2, wherein: the rubber pad that is fit with the pipeline is fixedly connected to the arc face of the arc plate close to the pipeline, and a strip-shaped bulge is formed on the arc face of the rubber pad, which is in contact with the pipeline.
6. The pipeline supporting device for the hydraulic engineering river channel improvement according to claim 5, wherein: and the arc-shaped plate fixedly connected with the fixed plate extends downwards to form a fixed seat, and the fixed seat is fixedly connected with a buffer unit between the first supporting plate and the second supporting plate respectively.
7. The pipeline supporting device for the hydraulic engineering river channel improvement according to claim 6, wherein: the buffer unit comprises a buffer spring, a sliding limiting rod is arranged on the first supporting plate and the second supporting plate and extends upwards around the buffer spring, a sliding limiting hole corresponding to the sliding limiting rod is vertically formed in the bottom of the fixing seat, and the sliding limiting rod slides in the sliding limiting hole.
8. The pipeline supporting device for the hydraulic engineering river channel improvement according to claim 7, wherein: the fixed plate is fixedly connected with two sliding rails in sliding connection with the second supporting plate, a sliding groove matched with the sliding rails penetrates through the bottom of the second supporting plate, and a limiting unit used for limiting the sliding of the second supporting plate is constructed between the second supporting plate and the fixed plate.
9. The pipeline supporting device for the hydraulic engineering river channel improvement according to claim 8, wherein: the limiting unit comprises a mounting plate fixedly connected to the middle of the second supporting plate, a locking hole penetrates through the mounting plate, a plurality of threaded holes are formed in the middle of the fixing plate at intervals, the arrangement direction of the threaded holes is consistent with the sliding direction of the second supporting plate, and a locking bolt penetrates through the locking hole and is in threaded connection with the threaded holes to form fixation of the second supporting plate.
10. The pipeline supporting device for the hydraulic engineering river channel improvement according to claim 1, wherein: the bottom of fixed plate is provided with U type base, the fixed plate with link firmly between the U type base and be used for adjusting the drive pneumatic cylinder of fixed plate height.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120186431.7U CN214579309U (en) | 2021-01-24 | 2021-01-24 | Hydraulic engineering is pipeline strutting arrangement for river course transformation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120186431.7U CN214579309U (en) | 2021-01-24 | 2021-01-24 | Hydraulic engineering is pipeline strutting arrangement for river course transformation |
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| CN214579309U true CN214579309U (en) | 2021-11-02 |
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| CN202120186431.7U Active CN214579309U (en) | 2021-01-24 | 2021-01-24 | Hydraulic engineering is pipeline strutting arrangement for river course transformation |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113915410A (en) * | 2021-11-23 | 2022-01-11 | 铜陵有色金属集团股份有限公司 | Fixing device is used in water supply and drainage pipe construction |
| WO2024021906A1 (en) * | 2023-06-09 | 2024-02-01 | 安徽科技学院 | Multifunctional intelligent pipe-bending machine |
-
2021
- 2021-01-24 CN CN202120186431.7U patent/CN214579309U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113915410A (en) * | 2021-11-23 | 2022-01-11 | 铜陵有色金属集团股份有限公司 | Fixing device is used in water supply and drainage pipe construction |
| WO2024021906A1 (en) * | 2023-06-09 | 2024-02-01 | 安徽科技学院 | Multifunctional intelligent pipe-bending machine |
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