CN210098590U - Multi-diameter multi-layer thin-wall corrugated pipe circle calibration device - Google Patents
Multi-diameter multi-layer thin-wall corrugated pipe circle calibration device Download PDFInfo
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- CN210098590U CN210098590U CN201920612998.9U CN201920612998U CN210098590U CN 210098590 U CN210098590 U CN 210098590U CN 201920612998 U CN201920612998 U CN 201920612998U CN 210098590 U CN210098590 U CN 210098590U
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Abstract
The utility model discloses a many diameters multilayer number thin wall bellows school circle device, including mounting platform, be located the mounting platform along the bearing roller device that is used for placing the work piece of work piece circumference equipartition, be located the work piece circumference equipartition and can follow the school circle device that is used for school circle thin wall bellows of work piece radial movement on the mounting platform, the school circle device includes can follow work piece radial movement's servo slip table, all is located and establishes respectively at the bellows inside and outside wall and can press from both sides the initiative pinch roller and passive pinch roller of tight bellows, be used for driving the drive arrangement of initiative pinch roller gyration, be used for adjusting the roll adjustment device in gap between initiative pinch roller and the passive pinch roller and be used for restricting the stop device of work piece axial displacement on the servo slip table. The utility model discloses can guarantee the accuracy of multilayer thin-walled bellows diameter, the uniformity of circularity eliminates the sudden change of circumferencial direction size and the production of cusp, improves the uniformity of product, reduces workman's intensity of labour, reduction in production cost.
Description
Technical Field
The utility model relates to a school circle device especially relates to a many diameters multilayer number thin wall bellows school circle device.
Background
At present, when carrying out multilayer thin-walled bellows campus, the mode that adopts the manual work to strike mostly, the manual work strikes the diameter size that can not the whole circumference of accurate assurance barrel, and strikes and can destroy whole circularity, can make multilayer thin-walled bellows produce the sudden change of size on the circumferencial direction, forms anomalous sharp point, can produce extremely adverse effect to subsequent processing for product production efficiency is low, and the defective products is high, thereby leads to the manufacturing cost of whole product generally on the high side.
Thus, there is a need to solve the above problems.
SUMMERY OF THE UTILITY MODEL
Utility model purpose: the utility model aims at providing a can improve bellows school circle quality, reduce labour cost, reduce manufacturing cost, improve production efficiency and reduce the many diameters multilayer number thin wall bellows school circle device of defective rate.
The technical scheme is as follows: in order to achieve the above purpose, the utility model discloses a many diameters multilayer thin wall corrugated pipe school circle device, including mounting platform, be located on the mounting platform along the work piece circumference equipartition be used for placing the work piece the bearing roller device, be located on the mounting platform along the work piece circumference equipartition and can be along the work piece radial movement be used for the school circle device of school circle thin wall corrugated pipe, the school circle device includes the servo slip table that can move along the work piece radial, all is located on the servo slip table and establishes respectively at the bellows inside and outside wall and can press from both sides the active pinch roller and the passive pinch roller of bellows, be used for driving the drive arrangement that the active pinch roller revolved, be used for adjusting the roll adjustment device in the gap between the active pinch roller and the passive pinch roller and be used for; the servo sliding table moves in the radial direction, the circumferential diameter size of an image limit point moving into the driving pressing wheel is equal to the outer diameter size of a workpiece, the workpiece is placed on the carrier roller device and is positioned in a gap between the driving pressing wheel and the driven pressing wheel, the gap between the driving pressing wheel and the driven pressing wheel is adjusted through the distance adjusting device, the driven pressing wheel is driven to clamp the workpiece, the axial movement of the workpiece is limited by the adjusting limiting device, the driving device drives the driving pressing wheel to rotate, the workpiece is rotated through positive pressure exerted on the workpiece by the driving pressing wheel and the driven pressing wheel, and in the rotating process, the workpiece is extruded and rounded through the driving pressing wheel.
The servo sliding table is also connected with a servo sliding table nut and a servo sliding table screw rod which are matched with each other, one end of the servo sliding table screw rod is connected with a servo motor through a driving bevel gear and a driven bevel gear which are meshed with each other, and the end part of the servo sliding table screw rod is provided with a servo sliding table screw rod bearing seat which is in running fit with the servo sliding table screw rod bearing seat; the servo sliding table is connected with the mounting platform through a linear guide rail pair; the servo motor drives the driving bevel gear and the driven bevel gear to be meshed and rotated to drive the servo sliding table screw rod to rotate, the servo sliding table screw is driven through threaded fit, and the servo sliding table screw drives the servo sliding table to move radially along the linear guide rail of the linear guide rail pair.
Preferably, the driving device comprises a driving motor, a driving chain wheel, a chain and a driven chain wheel which are sequentially connected, an output shaft of the driven chain wheel is connected with the driving pinch roller, and the driving motor is fixedly connected with the servo sliding table; the driving motor is started to drive the driving chain wheel to rotate, and torque is transmitted to the driven chain wheel through the chain so as to drive the driving pinch roller to rotate.
Furthermore, the distance adjusting device comprises an oil cylinder fixedly connected with the servo sliding table, a first connecting rod and a second connecting rod, one end of the first connecting rod is hinged with the oil cylinder, a connecting plate is hinged with the other end of the first connecting rod, and a pinch roller mounting seat is hinged with the other end of the second connecting rod, wherein the lower part of the connecting plate is in sliding fit with the servo sliding table through an oil-free sliding plate, the upper part of the connecting plate is in sliding fit with the pinch roller mounting seat through an oil-free sliding plate, and the pinch roller mounting seat is connected with a driven pinch roller through a; the extending end of the oil cylinder moves in the vertical direction to drive the first connecting rod to rotate and drive the second connecting rod to move in the horizontal direction, so that the pressing wheel mounting seat is driven to move horizontally together with the driven pressing wheel and the connecting plate, and the gap between the driving pressing wheel and the driven pressing wheel is adjusted.
Furthermore, the limiting device comprises a transition plate fixedly connected with the servo sliding table, and a horizontal adjusting screw rod and a horizontal adjusting screw nut which are positioned on the transition plate and matched with each other, wherein one end of the horizontal adjusting screw rod is connected with a horizontal adjusting hand wheel, and the end part of the horizontal adjusting screw rod is provided with a horizontal adjusting screw rod bearing seat which is rotationally matched with the horizontal adjusting screw rod and fixed on the transition plate; the horizontal adjusting screw is also connected with an upright post, a vertical adjusting screw rod and a vertical adjusting screw nut which are matched with each other are arranged on the upright post, one end of the vertical adjusting screw rod is connected with a vertical adjusting hand wheel, the end part of the vertical adjusting screw rod is provided with a vertical adjusting screw rod bearing seat which is rotationally matched with the vertical adjusting screw rod and is fixed on the upright post, and the vertical adjusting screw nut is fixedly connected with a limiting wheel mounting bearing seat which is rotationally matched with a limiting wheel; the axial height and the radial position of the limiting wheel are adjusted by rotating the horizontal adjusting hand wheel and the vertical adjusting hand wheel, so that the limiting wheel is embedded between two wave crests of the workpiece to limit the axial movement of the workpiece.
And the controller is respectively electrically connected with the servo motor, the driving motor and the oil cylinder and is used for controlling the operation of the oil cylinder.
Has the advantages that: compared with the prior art, the utility model has the advantages of it is following: the servo sliding table is adjusted to move radially, so that the circumferential diameter of an image limit point in the driving pressing wheel is equal to the outer diameter of a workpiece, the position of the servo sliding table is adjusted according to the sizes of different workpieces, and the requirements of workpieces with different diameters are met; the utility model places the workpiece on the roller device and in the gap between the active pinch roller and the passive pinch roller, adjusts the gap between the active pinch roller and the passive pinch roller through the distance adjusting device and drives the passive pinch roller to clamp the workpiece, thereby avoiding the radial movement of the workpiece; the utility model adjusts the axial height and radial position of the limiting wheel by rotating the horizontal adjusting hand wheel and the vertical adjusting hand wheel, so that the limiting wheel is embedded between two wave crests of the workpiece to limit the axial movement of the workpiece, and the positioning of the workpiece is completed; the utility model discloses a drive arrangement drives the initiative pinch roller and revolves, and positive pressure exerted on the work piece through initiative pinch roller and passive pinch roller makes the work piece gyration, and among the gyration process, through initiative pinch roller and passive pinch roller to the work piece extrusion school circle, can guarantee the accuracy of multilayer thin-walled bellows diameter, the uniformity of circularity eliminates the sudden change of circumferencial direction size and the production of cusp, improves the uniformity of product, reduces workman's intensity of labour, reduction in production cost.
Drawings
Fig. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of a partial cross-section of the present invention;
fig. 3 is a schematic structural view of the middle position limiting device of the present invention;
FIG. 4 is a partial perspective view of the present invention;
FIG. 5 is a top view of the workpiece during rounding according to the present invention;
fig. 6 is a front view of the middle workpiece during rounding.
Detailed Description
The technical solution of the present invention will be further explained with reference to the accompanying drawings.
As shown in fig. 1 and 4, the utility model relates to a many diameters multilayer number thin wall bellows school circle device, including mounting platform 1, roller device 2, school circle device and controller, wherein roller device 2 is located mounting platform 1 and follows work piece circumference equipartition, and its effect is for placing the work piece, and roller device 2's quantity can be 3, follows work piece circumference equipartition, and its quantity can be set for according to the work piece variation in size. The carrier roller device 2 comprises a carrier roller support and a roller shaft, the roller shaft is arranged to be cylindrical, when a workpiece rotates, the workpiece can rub with the carrier roller device to drive the carrier roller device to rotate, and the friction can be reduced in a cylindrical mode.
The circle correcting device is uniformly distributed on the mounting platform 1 along the circumferential direction of the workpiece and can move along the radial direction of the workpiece, and comprises a servo sliding table 3 capable of moving along the radial direction of the workpiece, an active pressing wheel 4 and a passive pressing wheel 5 which are respectively arranged on the inner wall and the outer wall of the corrugated pipe and are positioned on the servo sliding table 3 and can clamp the corrugated pipe, a driving device for driving the active pressing wheel 4 to rotate, a distance adjusting device for adjusting a gap between the active pressing wheel 4 and the passive pressing wheel 5 and a limiting device for limiting the axial displacement of the workpiece; the servo sliding table 3 moves in the radial direction, the circumferential diameter size of an image limit point moving into the active pressing wheel 4 is equal to the outer diameter size of a workpiece, the workpiece is placed on the carrier roller device 2 and is positioned in a gap between the active pressing wheel 4 and the passive pressing wheel 5, the gap between the active pressing wheel 4 and the passive pressing wheel 5 is adjusted through the distance adjusting device, the passive pressing wheel 5 is driven to clamp the workpiece, the axial movement of the workpiece is limited by the adjusting limiting device, the driving device drives the active pressing wheel 4 to rotate, the workpiece is rotated through positive pressure applied to the workpiece by the active pressing wheel 4 and the passive pressing wheel 5, and in the rotating process, the workpiece is extruded and corrected in a circle mode through the active.
As shown in fig. 2, the servo sliding table 3 of the present invention is further connected with a servo sliding table screw nut 6 and a servo sliding table screw rod 7 which are matched with each other, one end of the servo sliding table screw rod 7 is connected with a servo motor 10 through a driving bevel gear 8 and a driven bevel gear 9 which are meshed with each other, and the end of the servo sliding table screw rod 7 is provided with a servo sliding table screw rod bearing 11 which is matched with the servo sliding table screw rod in a rotating manner; wherein the servo sliding table 3 is connected with the mounting platform 1 through a linear guide rail pair 12; the linear guide rail pair 12 comprises a linear guide rail and a sliding block which are matched with each other, the sliding block can move along the linear guide rail, the linear guide rail is fixedly connected with the mounting platform 1, and the sliding block is fixedly connected with the servo sliding table. The controller and the servo motor 10 control the servo motor 10 to start, the servo motor 10 drives the driving bevel gear 8 and the driven bevel gear 9 to be meshed and rotated to drive the servo sliding table screw rod 7 to rotate, the servo sliding table screw nut 6 is driven through threaded fit, and the servo sliding table screw nut 6 drives the servo sliding table 3 to move radially along the linear guide rail of the linear guide rail pair 12.
The utility model discloses a middle driving device includes driving motor 13, driving sprocket 14, chain 15 and driven sprocket 16 that connect gradually, the output shaft of this driven sprocket 16 is connected with the initiative pinch roller 4, driving motor 13 links firmly with servo sliding table 3; the controller is electrically connected with the driving motor 13, the driving motor 13 is started to drive the driving chain wheel 14 to rotate, and the torque is transmitted to the driven chain wheel 16 through the chain 15 so as to drive the driving pinch roller 4 to rotate.
As shown in fig. 2, the distance adjusting device of the present invention comprises an oil cylinder 17 fixedly connected to the servo sliding table 3, a first connecting rod 18 and a second connecting rod 19 with one end hinged to the oil cylinder 17, a connecting plate 20 hinged to the other end of the first connecting rod 18, and a pressure roller mounting seat 21 hinged to the other end of the second connecting rod 19, wherein the lower part of the connecting plate 20 is in sliding fit with the servo sliding table 3 through an oil-free sliding plate 22, the upper part of the connecting plate 20 is in sliding fit with the pressure roller mounting seat 21 through an oil-free sliding plate 22, and the pressure roller mounting seat 21 is connected to a passive pressure roller 5 through a bearing; the controller is electrically connected with the oil cylinder 17 and controls the action of the oil cylinder 17. The extending end of the oil cylinder 17 moves in the vertical direction to drive the first connecting rod 18 to rotate and drive the second connecting rod 19 to move in the horizontal direction, so as to drive the pressing wheel mounting seat 21 to move horizontally together with the driven pressing wheel 5 and the connecting plate 20, and adjust the gap between the driving pressing wheel 4 and the driven pressing wheel 5.
As shown in fig. 3, the limiting device of the present invention comprises a transition plate 23 fixedly connected to the servo sliding table 3, a horizontal adjusting screw 24 and a horizontal adjusting screw 25 located on the transition plate 23 and matched with each other, wherein one end of the horizontal adjusting screw 24 is connected to a horizontal adjusting hand wheel 26, and the end of the horizontal adjusting screw 24 is provided with a horizontal adjusting screw shaft bearing 27 fixed on the transition plate 23 in rotation matching with the horizontal adjusting screw shaft bearing; the horizontal adjusting screw 25 is also connected with a vertical column 28, the vertical column 28 is provided with a vertical adjusting screw 29 and a vertical adjusting screw 30 which are matched with each other, one end of the vertical adjusting screw 29 is connected with a vertical adjusting hand wheel 31, the end part of the vertical adjusting screw 29 is provided with a vertical adjusting screw shaft bearing seat 32 which is rotationally matched with the vertical adjusting screw 29 and fixed on the vertical column 28, and the vertical adjusting screw 30 is fixedly connected with a limiting wheel mounting bearing seat 34 which is rotationally matched with a limiting wheel 33; by rotating the horizontal adjusting hand wheel 26 and the vertical adjusting hand wheel 31, the axial height and the radial position of the limiting wheel 33 are adjusted, so that the limiting wheel 33 is embedded between two wave crests of the workpiece to limit the axial movement of the workpiece.
The utility model discloses a work flow does:
as shown in fig. 5 and 6, when performing circle calibration, firstly, parameters such as the outer diameter size, the number of layers, the single-layer thickness and the like of a workpiece to be circle calibrated are input into a controller, the controller controls a servo motor 10 to start according to the input parameters, the servo motor 10 drives a driving bevel gear 8 and a driven bevel gear 9 to be meshed and rotated to drive a servo sliding table lead screw 7 to rotate, a servo sliding table screw nut 6 is driven through thread matching, and the servo sliding table screw nut 6 drives a servo sliding table 3 to move radially along a linear guide rail of a linear guide rail pair 12; thereby driving the active pinch roller 4, the passive pinch roller 5, the driving device, the distance adjusting device and the limiting device on the servo sliding table 3 to move together with the servo sliding table 3; the workpiece is moved to the position where the circumferential diameter of an image limit point in the active pinch roller 4 is equal to the outer diameter of the workpiece, and the workpiece is placed on the carrier roller device 2 and is positioned in a gap between the active pinch roller 4 and the passive pinch roller 5; the controller controls the action of the oil cylinder 17, the extending end of the oil cylinder 17 moves in the vertical direction to drive the first connecting rod 18 to rotate and drive the second connecting rod 19 to move in the horizontal direction, so that the pressing wheel mounting seat 21 and the driven pressing wheel 5 are driven to move, the gap between the driving pressing wheel 4 and the driven pressing wheel 5 is adjusted, and the driven pressing wheel 5 is driven to clamp a workpiece; then, the axial height and the radial position of the limiting wheel 33 are adjusted by rotating the horizontal adjusting hand wheel 26 and the vertical adjusting hand wheel 31, so that the limiting wheel 33 is embedded between two wave crests of the workpiece to limit the axial movement of the workpiece; the controller starts the driving motor 13 to drive the driving chain wheel 14 to rotate, torque is transmitted to the driven chain wheel 16 through the chain 15 so as to drive the driving pinch roller 4 to rotate, the workpiece starts to rotate through positive pressure exerted on the workpiece by the driving pinch roller 4 and the driven pinch roller 5, and in the rotating process, the part to be rounded is continuously extruded through the driving pinch roller 4 and the driven pinch roller 5, so that the purpose of forming and rounding the workpiece is achieved.
Claims (6)
1. The utility model provides a many layers of number of diameters thin wall bellows school circle device which characterized in that: the corrugated pipe rounding machine comprises a mounting platform (1), carrier roller devices (2) which are uniformly distributed on the mounting platform (1) along the circumferential direction of a workpiece and used for placing the workpiece, and rounding devices which are uniformly distributed on the mounting platform (1) along the circumferential direction of the workpiece and can radially move along the workpiece and used for rounding a thin-wall corrugated pipe, wherein each rounding device comprises a servo sliding table (3) capable of radially moving along the workpiece, a driving pressure wheel (4) and a driven pressure wheel (5) which are respectively arranged on the inner wall and the outer wall of the corrugated pipe and can clamp the corrugated pipe, a driving device used for driving the driving pressure wheel (4) to rotate, a distance adjusting device used for adjusting a gap between the driving pressure wheel (4) and the driven pressure wheel (5), and a limiting device used for limiting the axial displacement of the workpiece; servo slip table (3) radial movement, move to in initiative pinch roller (4) quadrant point circumference diameter size and work piece external diameter size equal, the work piece is placed on bearing roller device (2) and is located in the gap between initiative pinch roller (4) and passive pinch roller (5), adjust the gap between initiative pinch roller (4) and the passive pinch roller (5) and drive passive pinch roller (5) and press from both sides tight work piece through the roll adjustment device, adjust stop device restriction work piece axial displacement, drive arrangement drives initiative pinch roller (4) gyration, positive pressure through exerting on the work piece through initiative pinch roller (4) and passive pinch roller (5) makes the work piece gyration, in the gyration, extrude the school circle through initiative pinch roller (4) and passive pinch roller (5) to the work piece.
2. The multi-diameter multi-layer thin-walled bellows roundness correction device of claim 1, wherein: the servo sliding table (3) is also connected with a servo sliding table screw nut (6) and a servo sliding table screw rod (7) which are matched with each other, one end of the servo sliding table screw rod (7) is connected with a servo motor (10) through a driving bevel gear (8) and a driven bevel gear (9) which are meshed with each other, and the end part of the servo sliding table screw rod (7) is provided with a servo sliding table screw rod bearing seat (11) which is rotationally matched with the servo sliding table screw rod bearing seat; wherein the servo sliding table (3) is connected with the mounting platform (1) through a linear guide rail pair (12); the servo motor (10) drives the driving bevel gear (8) and the driven bevel gear (9) to be meshed and rotated to drive the servo sliding table screw rod (7) to rotate, the servo sliding table screw nut (6) is driven through thread fit, and the servo sliding table screw nut (6) drives the servo sliding table (3) to move radially along the linear guide rail of the linear guide rail pair (12).
3. The multi-diameter multi-layer thin-walled bellows roundness correction device of claim 1, wherein: the driving device comprises a driving motor (13), a driving chain wheel (14), a chain (15) and a driven chain wheel (16) which are sequentially connected, an output shaft of the driven chain wheel (16) is connected with the driving pinch roller (4), and the driving motor (13) is fixedly connected with the servo sliding table (3); a driving motor (13) is started to drive a driving chain wheel (14) to rotate, and torque is transmitted to a driven chain wheel (16) through a chain (15) so as to drive a driving pinch roller (4) to rotate.
4. The multi-diameter multi-layer thin-walled bellows roundness correction device of claim 1, wherein: the distance adjusting device comprises an oil cylinder (17) fixedly connected with the servo sliding table (3), a first connecting rod (18) and a second connecting rod (19) with one ends hinged with the oil cylinder (17), a connecting plate (20) hinged with the other end of the first connecting rod (18) and a pinch roller mounting seat (21) hinged with the other end of the second connecting rod (19), wherein the lower part of the connecting plate (20) is in sliding fit with the servo sliding table (3) through an oil-free sliding plate (22), the upper part of the connecting plate (20) is in sliding fit with the pinch roller mounting seat (21) through the oil-free sliding plate (22), and the pinch roller mounting seat (21) is connected with a passive pinch roller (5) through a bearing; the extending end of the oil cylinder (17) moves in the vertical direction to drive the first connecting rod (18) to rotate and drive the second connecting rod (19) to move in the horizontal direction, so that the pressing wheel mounting seat (21) is driven to move together with the driven pressing wheel (5) and the connecting plate (20), and the gap between the driving pressing wheel (4) and the driven pressing wheel (5) is adjusted.
5. The multi-diameter multi-layer thin-walled bellows roundness correction device of claim 1, wherein: the limiting device comprises a transition plate (23) fixedly connected with the servo sliding table (3), a horizontal adjusting screw rod (24) and a horizontal adjusting screw nut (25), wherein the horizontal adjusting screw rod (24) and the horizontal adjusting screw nut (25) are positioned on the transition plate (23) and are matched with each other, one end of the horizontal adjusting screw rod (24) is connected with a horizontal adjusting hand wheel (26), and the end part of the horizontal adjusting screw rod (24) is provided with a horizontal adjusting screw rod bearing seat (27) which is rotationally matched with the horizontal adjusting screw rod and is fixed on the transition plate (23); the horizontal adjusting screw nut (25) is also connected with an upright post (28), the upright post (28) is provided with a vertical adjusting screw rod (29) and a vertical adjusting screw nut (30) which are matched with each other, one end of the vertical adjusting screw rod (29) is connected with a vertical adjusting hand wheel (31), the end part of the vertical adjusting screw rod (29) is provided with a vertical adjusting screw rod bearing seat (32) which is rotationally matched with the vertical adjusting screw rod and fixed on the upright post (28), and the vertical adjusting screw nut (30) is fixedly connected with a limiting wheel mounting bearing seat (34) which is rotationally matched with a limiting wheel (33); the axial height and the radial position of the limiting wheel (33) are adjusted by rotating the horizontal adjusting hand wheel (26) and the vertical adjusting hand wheel (31), so that the limiting wheel (33) is embedded between two wave crests of the workpiece to limit the axial movement of the workpiece.
6. The multi-diameter multi-layer thin-walled bellows roundness correction device of claim 1, wherein: the device also comprises a controller which is respectively electrically connected with the servo motor (10), the driving motor (13) and the oil cylinder (17) and is used for controlling the operation of the servo motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920612998.9U CN210098590U (en) | 2019-04-29 | 2019-04-29 | Multi-diameter multi-layer thin-wall corrugated pipe circle calibration device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920612998.9U CN210098590U (en) | 2019-04-29 | 2019-04-29 | Multi-diameter multi-layer thin-wall corrugated pipe circle calibration device |
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| CN210098590U true CN210098590U (en) | 2020-02-21 |
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| CN201920612998.9U Active CN210098590U (en) | 2019-04-29 | 2019-04-29 | Multi-diameter multi-layer thin-wall corrugated pipe circle calibration device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109967565A (en) * | 2019-04-29 | 2019-07-05 | 中船重工鹏力（南京）智能装备系统有限公司 | More diameter multilayer number thin-wall corrugated tube school circle devices |
-
2019
- 2019-04-29 CN CN201920612998.9U patent/CN210098590U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109967565A (en) * | 2019-04-29 | 2019-07-05 | 中船重工鹏力（南京）智能装备系统有限公司 | More diameter multilayer number thin-wall corrugated tube school circle devices |
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