CN220077879U - Circular pipe stacker crane - Google Patents
Circular pipe stacker crane Download PDFInfo
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- CN220077879U CN220077879U CN202321551104.2U CN202321551104U CN220077879U CN 220077879 U CN220077879 U CN 220077879U CN 202321551104 U CN202321551104 U CN 202321551104U CN 220077879 U CN220077879 U CN 220077879U
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- frame
- pipe
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- conveying belt
- pipes
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- 238000001179 sorption measurement Methods 0.000 claims abstract description 48
- 239000000463 material Substances 0.000 claims abstract description 36
- 230000000670 limiting effect Effects 0.000 claims description 17
- 230000005389 magnetism Effects 0.000 claims 1
- 238000005520 cutting process Methods 0.000 abstract description 11
- 238000000034 method Methods 0.000 abstract description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 229910052742 iron Inorganic materials 0.000 description 4
- 230000005484 gravity Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000003698 laser cutting Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Abstract
The utility model relates to the technical field of pipe conveying, in particular to a circular pipe stacker for stacking magnetically attractable circular pipes, which comprises a conveying belt for conveying the pipes from back to front, a material moving assembly for transferring the pipes and a stacking frame for stacking the pipes, wherein the material moving assembly and the stacking frame are correspondingly arranged on the left side and the right side of the front part of the conveying belt, the material moving assembly comprises a frame, a sliding frame which is connected with the frame in a left-right sliding manner, a translation device which is arranged on the frame and used for driving the sliding frame to move left and right, a lifting device which is arranged on the sliding frame, and an electromagnetic adsorption plate which is arranged at the output end of the lifting device, wherein the lower side of the electromagnetic adsorption plate is provided with an arc adsorption groove matched with the outer side of the pipes, and the axle center of the arc adsorption groove is arranged in a front-back extending manner. By the method, the pipe can be moved to the side of the stacking area from the external cutting device and stacked in the stacking frame in the stacking area, so that the participation rate of operators and the labor intensity are reduced, and the automation level of pipe stacking is improved.
Description
Technical Field
The utility model relates to the technical field of pipe conveying, in particular to a circular pipe stacker crane.
Background
The round pipe is a material with two open ends and hollow concentric round section, and the length of the round pipe is larger than the length of the round pipe. The round iron or steel pipe is a more traditional pipe, has certain strength and corrosion resistance, and can be widely used in pipelines, thermal equipment, mechanical industry, petroleum geological drilling, containers, chemical industry and special purposes.
In the production process, the iron or steel round pipes are cut to a fixed length through a pipe cutting device such as a circular sawing machine, a band sawing machine or a laser cutting machine, and then transferred to the next procedure to be processed in the next step, so that a plurality of round pipes are piled in a piling frame for convenient transfer, and the round pipes are transferred once through the transferring piling frame. However, in order to reduce the influence on the pipe cutting device, the stacking frame is required to be placed in a stacking area far away from the pipe cutting device, an operator is required to carry the pipe back and forth in the pipe cutting device and the stacking area and put the pipe into the stacking frame, so that the labor participation rate of the operator is high, the iron or steel pipe is heavier, the labor intensity of the operator is high, and the automation level of stacking the round pipe is low.
Disclosure of Invention
The utility model aims to solve the technical problem of providing a circular pipe stacker crane which can reduce the participation rate of operators and labor intensity and improve the automation level of pipe stacking.
In order to solve the technical problems, the circular pipe stacker crane comprises a conveying belt for conveying pipes from back to front, a material moving assembly for transferring the pipes and a stacker frame for stacking the pipes, wherein the material moving assembly and the stacker frame are correspondingly arranged on the left side and the right side of the front part of the conveying belt, the material moving assembly comprises a frame, a sliding frame connected with the frame in a left-right sliding mode, a translation device arranged on the frame and used for driving the sliding frame to move left and right, a lifting device arranged on the sliding frame and an electromagnetic adsorption plate arranged at the output end of the lifting device, and an arc adsorption groove matched with the outer side of the pipes is formed in the lower side of the electromagnetic adsorption plate and extends back and forth in the axis of the arc adsorption groove.
As an alternative, the circular pipe stacker crane of the present utility model further includes a positioning plate disposed on the front side of the conveyor belt and adapted to abut against the front end of the pipe.
Alternatively, the plurality of arc adsorption grooves are arranged at equal intervals on the left and right sides of the lower side of the electromagnetic adsorption plate.
As an alternative scheme, the round pipe stacker crane provided by the utility model further comprises a blanking plate arranged at one side, close to the stacking frame, of the front part of the conveying belt, the material moving assembly further comprises a push plate for pushing the pipe on the conveying belt to the blanking plate and a material pushing cylinder arranged on the frame and used for driving the push plate to move left and right, and one side, far away from the conveying belt, of the blanking plate is provided with a limit folded edge which extends vertically upwards and is used for placing the pipe on the blanking plate to fall.
Alternatively, the blanking plate is inclined downwards along the direction away from the conveying belt and forms an included angle of 1-3 degrees with the horizontal plane.
As an alternative scheme, the circular pipe stacker crane also comprises limiting plates and receiving plates, wherein the limiting plates and the receiving plates are correspondingly arranged on the left side and the right side of the rear part of the conveying belt, the limiting plates are vertically arranged, and the receiving plates are inclined upwards in the direction deviating from the limiting plates and form an included angle of 15-20 degrees with the horizontal plane.
As an alternative scheme, two sliding frames are arranged on the frame at intervals in the front-back direction, two groups of lifting devices are correspondingly arranged on the two sliding frames, a material moving frame is arranged at the conveying end of each lifting device, a plurality of electromagnetic adsorption plates are arranged at intervals in the front-back direction below the material moving frame, and the translation device is used for driving the two sliding frames to synchronously move.
As an alternative scheme, the translation device comprises a rotating shaft, two first gears, two racks, a servo motor and a second gear, wherein the rotating shaft is connected with the rack in a rotating mode, the first gears are correspondingly fixed at two ends of the rotating shaft, the racks are correspondingly fixed on the two sliding racks one by one, the servo motor is installed on the rack, and the second gear is fixed at the output end of the servo motor and meshed with the first gears.
As an alternative scheme, two supporting beams which are arranged at intervals from front to back are fixed at the bottom of the stacking frame, and a plurality of hooks are fixed at the left side and the right side of the stacking frame.
As an alternative scheme, the front and back of the inner bottom surface of the stacking frame are provided with a plurality of bearing plates for bearing round pipes at intervals, and the upper sides of the bearing plates incline downwards along the direction away from the conveying belt and form an included angle of 1-3 degrees with the horizontal plane.
The implementation of the utility model has the following beneficial effects:
according to the circular pipe stacker disclosed by the utility model, the pipe can be moved to the side of the stacking area from the external cutting device and stacked in the stacking frame in the stacking area by mutually matching the conveying belt, the material moving assembly, the stacking frame, the sliding frame, the translation device, the lifting device, the electromagnetic adsorption plate and the circular arc adsorption groove, so that the participation rate and the labor intensity of operators are reduced, and the automation level of pipe stacking is improved.
Drawings
FIG. 1 is a schematic front view of a circular pipe palletizer in an embodiment of the present utility model;
FIG. 2 is a schematic perspective view of a circular pipe palletizer in an embodiment of the present utility model;
FIG. 3 is an enlarged view at A in FIG. 1;
FIG. 4 is an enlarged view at B in FIG. 1;
FIG. 5 is an enlarged view of FIG. 2C;
FIG. 6 is a schematic view of a translation device mounted on a frame according to an embodiment of the present utility model;
FIG. 7 is a schematic perspective view of a pallet according to an embodiment of the utility model;
fig. 8 is a schematic front view of the structure of the pallet in the embodiment of the utility model.
In the figure: 100. a conveyor belt; 200. a material moving assembly; 300. a stacking frame; 210. a frame; 220. a carriage; 230. a translation device; 240. a lifting device; 250. an electromagnetic adsorption plate; 251. an arc adsorption groove; 400. a positioning plate; 500. a blanking plate; 260. a push plate; 270. a pushing cylinder; 510. limit flanging; 600. a limiting plate; 700. a receiving plate; 280. a material moving frame; 231. a rotating shaft; 232. a first gear; 233. a rack; 234. a servo motor; 235. a second gear; 310. a bolster; 320. a hook; 330. and a supporting plate.
Detailed Description
The present utility model will be further described with reference to the accompanying drawings and specific embodiments so as to more clearly understand the technical ideas claimed in the present utility model.
As shown in fig. 1 to 8, a circular pipe palletizer for palletizing circular pipes which can be magnetically attracted according to an embodiment of the present utility model includes a conveyor belt 100 for conveying the pipes from the rear to the front, a material transferring assembly 200 for transferring the pipes, and a palletizing rack 300 for palletizing the pipes, in fact, the rear portion of the conveyor belt 100 should be disposed beside an external pipe cutting device, which may be a band saw, a circular saw, a laser cutter, or the like, the cut pipes leaving the blanking portion of the external cutting device are transferred onto the conveying surface of the conveyor belt 100 from the rear portion of the conveyor belt 100 or the left or right of the rear portion of the conveyor belt 100, and the conveyor belt 100 is operated to drive the pipes placed on the conveying surface of the conveyor belt 100 to be conveyed from the rear to the palletizing area.
The material moving assembly 200 and the stacking frame 300 are correspondingly arranged at the left and right sides of the front part of the conveying belt 1 () (), the material moving assembly 200 is arranged at the left side of the conveying belt 100, the stacking frame 300 is arranged at the right side of the conveying belt 100, and the area where the stacking frame 300 is arranged is a stacking area; and the positions of the material moving assembly 200 and the stacking frame 300 can be interchanged according to actual requirements.
The material moving assembly 200 comprises a frame 210, a sliding frame 220 which is connected with the frame 210 in a left-right sliding manner, a translation device 230 which is arranged on the frame 210 and used for driving the sliding frame 220 to move left and right, a lifting device 240 which is arranged on the sliding frame 220, and an electromagnetic adsorption plate 250 which is arranged at the output end of the lifting device 240, wherein an arc adsorption groove 251 matched with the outer side of a pipe is arranged on the lower side of the electromagnetic adsorption plate 250, namely the diameter of an arc of the arc adsorption groove 251 is equal to the outer diameter of the pipe to be adsorbed, and the axis of the arc adsorption groove 251 extends back and forth. In practice, the translation device 230 may be a horizontal moving table or a servo push rod with its output end horizontally disposed toward the stacking frame 300 to change the left and right positions of the carriage 220, and the lifting device 240 may be a servo push rod with its output end vertically disposed downward to change the up and down positions of the electromagnetic adsorption plate 250. It should be noted that, the pipe targeted by the circular pipe stacker crane of the present utility model is a pipe that can be attracted by a magnet, such as an iron pipe, a martensitic or ferritic steel pipe, when the electromagnetic attraction plate 250 is electrified, a magnetic field is generated to attract the pipe, and the pipe is swung until extending back and forth under the limiting action of the circular arc attraction groove 251; when the electromagnetic adsorption plate 250 is powered off, the magnetic field disappears so as to put down the pipe. In practice, the adsorption force of the electromagnetic adsorption plate 250 is selected according to the gravity of the steel pipe to be adsorbed, and the type selection rule is not repeated here.
According to the circular pipe stacker disclosed by the utility model, the pipe can be moved to the side of a stacking area from an external cutting device and stacked in the stacking frame 300 in the stacking area by mutually matching the conveying belt 100, the material moving assembly 200, the stacking frame 300, the rack 210, the sliding frame 220, the translation device 230, the lifting device 240, the electromagnetic adsorption plate 250 and the circular arc adsorption groove 251, so that the participation rate of operators and the labor intensity are reduced, and the automation level of pipe stacking is improved.
Because operators are required to visually identify the front end of the pipe on the conveying belt 100 or identify that the front end of the pipe reaches the front end of the conveying belt 100 through a visual identification system, the conveying belt 100 is controlled to stop running so as to place the pipe falling from the front end of the conveying belt 100, the conveying belt 100 is frequently stopped, and the conveying efficiency of the pipe is reduced.
Further, the plurality of arc adsorption grooves 251 are preferably disposed at equal intervals on the left and right sides of the lower side of the electromagnetic adsorption plate 250, as shown in fig. 3, six arc adsorption grooves 251 are disposed on the lower side of the electromagnetic adsorption plate 250, and the number of the arc adsorption grooves 251 can be adjusted according to actual requirements, so that the material transferring device can place a plurality of tubes into the stacking rack 300 at a time. And, the center distance between two adjacent arc adsorption grooves 251 is the same as the outer diameter of the pipe, and the central angle of the arc adsorption grooves 251 is smaller than 180 degrees, so that the two adjacent adsorbed pipe materials are mutually clung.
Further, the circular pipe stacker of the present utility model further preferably includes a blanking plate 250 provided at a side of the front of the conveyor belt 100 near the stacker rack 300, as shown in fig. 1 and 4, the stacker rack 300 is provided at the right side of the conveyor belt 100, the blanking is provided at the right side of the conveyor belt 100, and in fact, the position of the blanking plate 250 is adjusted according to the position of the stacker rack 300; the material moving assembly 200 further comprises a pushing plate 260 for pushing the pipe on the conveyer belt 100 to the blanking plate 250 and a pushing cylinder 270 mounted on the frame 210 for driving the pushing plate 260 to move left and right, a limit folded edge 510 which is vertically and upwardly extended and arranged on one side of the blanking plate 250 away from the conveyer belt 100 and used for placing the pipe on the blanking plate 250 to drop is arranged on one side of the blanking plate 250, and the pushing cylinder 270 is matched with the pushing plate 260 to push the pipe to the blanking plate 250, so that more pipes are prevented from being blocked in the front of the conveyer belt 100, and the pipe is prevented from leaving the blanking plate 250 under the action of the limit folded edge 510. Further, the blanking plate 250 is preferably inclined downward in a direction away from the conveyor belt 100 and forms an angle of 1-3 degrees with the horizontal plane, as shown in fig. 4, the blanking plate 250 is inclined downward from left to right, and under the action of gravity, the pipe is placed to a certain extent and returned to the front of the conveyor belt 100, and the electromagnetic adsorption plate 250 can successfully adsorb a plurality of pipes.
It should be noted that, the circular pipe stacker crane of the present utility model further preferably includes a limiting plate 600 and a receiving plate 700 correspondingly disposed on the left and right sides of the rear portion of the conveyor belt 100, as shown in fig. 2, the limiting edge is disposed on the left side of the rear portion of the conveyor belt 100, the receiving plate 700 is disposed on the right side of the rear portion of the conveyor belt 100, and the positions of the limiting plate 600 and the receiving plate 700 can be interchanged according to actual requirements; the limiting plate 600 is vertically arranged, the material receiving plate 700 is inclined upwards along the direction deviating from the limiting plate 600 and forms an included angle of 15-20 degrees with the horizontal plane, as shown in fig. 4, the material receiving plate 700 is inclined upwards from left to right, one side, far away from the conveying belt 100, of the material receiving plate 700 is connected with the blanking end of an external pipe cutting device so as to receive the pipe leaving the external pipe cutting device, the pipe rolls into the front part of the conveying belt 100 from right to left downwards under the guiding action of the material receiving plate 700, and the pipe is placed under the action of the limiting plate 600 to leave from the left side of the front part of the conveying belt 100. It should be noted that, if the included angle between the receiving plate 700 and the horizontal plane is smaller than 15 degrees, the speed of transferring the pipe to the front portion of the conveyor belt 100 is too slow, and if the included angle between the receiving plate 700 and the horizontal plane is larger than 20 degrees, the speed of transferring the pipe to the front portion of the conveyor belt 100 is too fast and the pipe is easy to collide, so that the included angle between the receiving plate 700 and the horizontal plane is quite suitable for 15-20 degrees.
It should be noted that, preferably, two carriages 220 are disposed on the frame 210 at intervals in the front-back direction, two sets of lifting devices 240 are correspondingly mounted on the two carriages 220, a material moving frame 280 is disposed at a conveying end of each lifting device 240, a plurality of electromagnetic adsorption plates 250 are disposed at intervals in the front-back direction under the material moving frame 280, in fig. 2, three electromagnetic adsorption plates 250 are disposed under the material moving frame 280, the number and the spacing of the electromagnetic adsorption plates can be changed according to actual needs, the translation device 230 is used for driving the two carriages 220 to move synchronously, and a plurality of positions of the pipe are correspondingly adsorbed by the electromagnetic adsorption plates 250 disposed at intervals in the front-back direction, so that the firmness of pipe adsorption is improved, and the length of the pipe that the electromagnetic adsorption plates 250 can adsorb is prolonged.
In fact, the translation device 230 preferably includes a rotating shaft 231 rotatably connected to the frame 210, two first gears 232 correspondingly fixed at two ends of the rotating shaft 231, two racks 233 correspondingly fixed to the two carriages 220 one by one, a servo motor 234 mounted on the frame 210, and a second gear 235 fixed at an output end of the servo motor 234 and meshed with the first gear 232, wherein the servo motor 234 operates to enable the carriages 220 to synchronously slide left and right relative to the frame 210 through the cooperation of the rotating shaft 231, the first gears 232, the gears and the second gears 235, so as to ensure the left and right sliding of the carriage 280 and a plurality of battery adsorption plates on the west side of the carriage 280.
Specifically, the bottom of the stacking frame 300 is preferably fixed with two supporting beams 310 that are arranged at intervals in front-back direction, so that the bottom of the stacking frame 300 leaves the ground, and the stacking frame 300 is moved in cooperation with a forklift; the left side and the right side of the stacking frame 300 are preferably fixed with a plurality of hooks 320, and the stacking frame 300 is moved by matching with hooks on a travelling crane.
In addition, the inner bottom surface of the stacking frame 300 is preferably provided with a plurality of supporting plates 330 for supporting the round pipes at intervals back and forth, the upper sides of the supporting plates 330 are inclined downwards along the direction away from the conveying belt 100 and form an included angle of 1-3 degrees with the horizontal plane, in this embodiment, the stacking frame 300 is arranged on the right side of the conveying belt 1 () (), as shown in fig. 8, that is, the upper sides of the supporting plates 330 are inclined downwards from left to right, and by the inclination of the upper sides of the supporting plates 330, the round pipes placed on the upper sides of the supporting plates 300 are in contact with each other under the gravity to realize the automatic alignment of the round pipes, so that the round pipes can be quickly placed in the stacking frame 300, and the placement position accuracy of the round pipes is reduced.
Various other corresponding changes and modifications will occur to those skilled in the art from the foregoing description and the accompanying drawings, and all such changes and modifications are intended to be included within the scope of the present utility model as defined in the appended claims.
Claims (10)
1. A circular tubular product hacking machine for circular tubular product that pile up neatly can be inhaled by magnetism, its characterized in that: the circular pipe stacker crane comprises a conveying belt for conveying pipes from back to front, a material moving assembly for transferring the pipes and a stacking frame for stacking the pipes, wherein the material moving assembly and the stacking frame are correspondingly arranged on the left side and the right side of the front portion of the conveying belt, the material moving assembly comprises a frame, a sliding frame which is connected with the frame in a sliding mode, a translation device which is arranged on the frame and is used for driving the sliding frame to move left and right, a lifting device arranged on the sliding frame and an electromagnetic adsorption plate arranged at the output end of the lifting device, an arc adsorption groove matched with the outer side of the pipes is formed in the lower side of the electromagnetic adsorption plate, and the axle center of the arc adsorption groove is arranged in a front-back extending mode.
2. A circular pipe palletizer as in claim 1 wherein: the positioning plate is arranged on the front side of the conveying belt and used for propping against the front end of the pipe.
3. A circular pipe palletizer as in claim 2, wherein: the arc adsorption grooves are arranged at equal intervals on the left and right sides of the lower side of the electromagnetic adsorption plate.
4. A circular pipe palletizer as in claim 3 wherein: the automatic feeding device is characterized by further comprising a blanking plate arranged on one side, close to the stacking frame, of the front portion of the conveying belt, wherein the material moving assembly further comprises a pushing plate for pushing the pipe on the conveying belt to the blanking plate and a pushing cylinder arranged on the frame and used for driving the pushing plate to move left and right, and one side, far away from the conveying belt, of the blanking plate is provided with a limiting folded edge which extends vertically upwards and is used for placing the pipe on the blanking plate to fall.
5. A circular pipe palletizer as in claim 4 wherein: the blanking plate is inclined downwards along the direction deviating from the conveying belt and forms an included angle of 1-3 degrees with the horizontal plane.
6. A circular pipe palletizer as in claim 1 wherein: the automatic feeding device is characterized by further comprising limiting plates and receiving plates, wherein the limiting plates and the receiving plates are correspondingly arranged on the left side and the right side of the rear portion of the conveying belt, the limiting plates are vertically arranged, and the receiving plates incline upwards along the direction deviating from the limiting plates and form an included angle of 15-20 degrees with the horizontal plane.
7. A circular pipe palletizer as in claim 1 wherein: the two carriages are arranged on the frame at intervals from front to back, the two groups of lifting devices are correspondingly arranged on the two carriages, a material moving frame is arranged at the conveying end of the two lifting devices, a plurality of electromagnetic adsorption plates are arranged at intervals from front to back at the lower side of the material moving frame, and the translation device is used for driving the two carriages to synchronously move.
8. A circular pipe palletizer as in claim 7 wherein: the translation device comprises a rotating shaft, two first gears, two racks, a servo motor and a second gear, wherein the rotating shaft is connected with the rack in a rotating mode, the first gears are correspondingly fixed at two ends of the rotating shaft, the racks are correspondingly fixed on the two sliding racks one by one, the servo motor is installed on the rack, and the second gear is fixed at the output end of the servo motor and meshed with the first gears.
9. A circular pipe palletizer as in claim 1 wherein: two supporting beams which are arranged at intervals from front to back are fixed at the bottom of the stacking frame, and a plurality of hooks are fixed on the left side and the right side of the stacking frame.
10. A circular pipe palletizer as in claim 1 wherein: the front and back of the inner bottom surface of the stacking frame are provided with a plurality of bearing plates for bearing round pipes at intervals, and the upper sides of the bearing plates incline downwards along the direction away from the conveying belt and form an included angle of 1-3 degrees with the horizontal plane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321551104.2U CN220077879U (en) | 2023-06-16 | 2023-06-16 | Circular pipe stacker crane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321551104.2U CN220077879U (en) | 2023-06-16 | 2023-06-16 | Circular pipe stacker crane |
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| Publication Number | Publication Date |
|---|---|
| CN220077879U true CN220077879U (en) | 2023-11-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321551104.2U Active CN220077879U (en) | 2023-06-16 | 2023-06-16 | Circular pipe stacker crane |
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| Country | Link |
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| CN (1) | CN220077879U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117699482A (en) * | 2024-02-05 | 2024-03-15 | 四川万圣通精密机械制造有限公司 | Automatic pile up neatly mechanism of steel pipe |
-
2023
- 2023-06-16 CN CN202321551104.2U patent/CN220077879U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117699482A (en) * | 2024-02-05 | 2024-03-15 | 四川万圣通精密机械制造有限公司 | Automatic pile up neatly mechanism of steel pipe |
| CN117699482B (en) * | 2024-02-05 | 2024-04-19 | 四川万圣通精密机械制造有限公司 | Automatic pile up neatly mechanism of steel pipe |
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