CN215236927U - Rounding device for spigot end of cast iron pipe - Google Patents
Rounding device for spigot end of cast iron pipe Download PDFInfo
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- CN215236927U CN215236927U CN202120581674.0U CN202120581674U CN215236927U CN 215236927 U CN215236927 U CN 215236927U CN 202120581674 U CN202120581674 U CN 202120581674U CN 215236927 U CN215236927 U CN 215236927U
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Abstract
The utility model provides a cast iron pipe spigot end roundness correcting device, belong to cast iron pipe production technical field, including base, a drive mechanism and school button head, the base is used for rolling support cast iron pipe, a drive mechanism locates on the base, and be used for driving the cast iron pipe and regard self axis as the pivot rotation, and make the axis position of cast iron pipe remain unchanged, the school button head locates on the base, and can be along the axial displacement of cast iron pipe, stretch into or withdraw from the spigot end of cast iron pipe, be equipped with a plurality of interior spreader rolls on the school button head, the axis of interior spreader roll is parallel with the axis of cast iron pipe, the interior spreader roll distributes on the face of cylinder coaxial with the cast iron pipe, and can radial displacement, the interior spreader roll is used for when the school button head stretches into the spigot end, be close to and the inner wall of rolling contact cast iron pipe; the utility model provides a cast iron pipe socket end school circle device can solve artifical school circle inefficiency, the poor problem of precision.
Description
Technical Field
The utility model belongs to the technical field of the cast iron pipe production, more specifically say, relate to a cast iron pipe socket end school circle device.
Background
The two cast iron pipes can be connected through the bell and spigot, one end of each cast iron pipe is provided with a bell mouth with a larger diameter, the other end of each cast iron pipe is provided with a socket with the diameter consistent with that of the pipe body, and the sockets are inserted into the bell mouths and welded during construction, so that the connection of the two sections of pipelines is realized. If the ovality of the socket end is out of tolerance, the connection of two sections of pipelines can be influenced, and the quality of pipeline engineering is caused to be problematic. The shape of the spigot end can be detected in the production process of the cast iron pipe, and if the ovality is out of tolerance, the circle calibration operation is carried out, so that the ovality error of the spigot end is eliminated. In the prior art, manual circle correction is generally adopted, an error point is measured through a circle correction scale, a pressing block driven by a hydraulic system is operated to locally press the error point, and an ovality error is eliminated after repeated measurement and pressing. The manual rounding is low in efficiency, and a local pressing mode is adopted, so that the precision is not high, and improvement is needed.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a cast-iron pipe socket end school circle device aims at solving artifical school circle inefficiency, the poor problem of precision.
In order to achieve the above object, the utility model adopts the following technical scheme: the rounding device for the spigot end of the cast iron pipe comprises a base, a first driving mechanism and a rounding head;
the base is used for supporting the cast iron pipe in a rolling mode;
the first driving mechanism is arranged on the base and used for driving the cast iron pipe to rotate by taking the axis of the cast iron pipe as a rotating shaft, and the position of the axis of the cast iron pipe is kept unchanged;
the correcting head is arranged on the base and can move along the axial direction of the cast iron pipe and extend into or withdraw from the socket end of the cast iron pipe, a plurality of inner support rollers are arranged on the correcting head, the axes of the inner support rollers are parallel to the axis of the cast iron pipe, the inner support rollers are distributed on a cylindrical surface coaxial with the cast iron pipe and can move radially, and the inner support rollers are used for approaching to and rolling to contact with the inner wall of the cast iron pipe when the correcting head extends into the socket end.
Furthermore, a second driving mechanism for driving the inner support roller to move in the radial direction is arranged on the correcting head, and the second driving mechanism comprises a radial rod and an axial rod;
the radial rod is arranged on the circle correcting head in a sliding mode and arranged along the radius direction of the cast iron pipe, the first end of the radial rod is close to the circle center, the second end of the radial rod is far away from the circle center, and the inner supporting roller is rotatably arranged at the second end;
one end of the axial rod is located inside the aligning head and is provided with a wedge-shaped surface, the wedge-shaped surface is in contact with the first end, the other end of the axial rod is located outside the aligning head and is connected with a second power unit, and the second power unit is used for driving the axial rod to move axially along the cast iron pipe, so that the axial position of the wedge-shaped surface is changed, and the radial rod is driven to move radially.
Further, the first end is provided with a contact roller, and the contact roller is in rolling contact with the wedge-shaped surface.
Furthermore, the wedge-shaped surface is provided with a shape following clamping groove, and the shape following clamping groove is in rolling clamping connection with the contact roller to drive the radial rod to radially extend and retract.
Furthermore, a pressure sensor is arranged on the radial rod and used for detecting the pressure applied when the inner support roller is in rolling contact with the inner wall of the cast iron pipe.
Furthermore, the correcting head is of a revolving body structure with the axis parallel to the cast iron pipe, a radial slideway and an axial central slideway are arranged on the correcting head, the radial rod is arranged in the radial slideway in a sliding manner, and the axial rod is arranged in the axial central slideway in a sliding manner.
Further, the radius of the round correction head is smaller than the inner diameter of the cast iron pipe, and the difference value is not more than 10 centimeters.
Furthermore, a sliding block capable of sliding along the axial direction of the cast iron pipe is arranged on the base, the correcting head, the axial rod and the second power unit are all arranged on the sliding block, and a third power unit used for driving the sliding block is arranged on the base.
Further, the first driving mechanism comprises a supporting wheel and a pressing driving wheel;
the supporting wheel is arranged below the cast iron pipe and used for supporting the cast iron pipe in a rolling manner;
the pressing driving wheel is used for pressing the cast iron pipe from the upper part and is connected with a first driving unit, and the first driving unit is used for driving the pressing driving wheel to rotate.
Furthermore, the supporting wheel and the pressing driving wheel are both cylindrical structures with axes parallel to the cast iron pipe, and the supporting wheel and the pressing driving wheel form a delta-shaped structure when viewed along the axial direction of the cast iron pipe.
Compared with the prior art, the rounding device for the socket end of the cast iron pipe is provided with the rounding head which can extend into the socket end of the cast iron pipe, the rounding head is provided with a plurality of inner supporting rollers which are distributed along the cylindrical surface, and the inner supporting rollers can radially extend and retract; when in roundness correction, the cast iron pipe rotates around the self axis around the axis under the driving of the first driving mechanism, the correcting head extends into the spigot end of the cast iron pipe under the retraction state of the inner supporting roller, then the inner supporting roller extends out radially at the same time to ensure that the inner supporting roller is always positioned on the same cylindrical surface, when the roller surface of the inner supporting roller is in rolling contact with the inner wall of the cast iron pipe, the correcting force can be generated on the cast iron pipe to repair the shape error, when the extending distance of the inner supporting roller is matched with the inner diameter of the cast iron pipe, the extension is stopped, and a period of time is kept to ensure that the shape of the spigot end is corrected thoroughly; the utility model provides a school circle device compares the manual work and need not repeat the measurement and press with the part, has improved school circle efficiency to interior vaulting roller is located same face of cylinder, relies on its position to guarantee that the socket end rectifies to anticipated circular, has improved the school circle precision.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural view of a rounding device for a socket end of a cast iron pipe provided in an embodiment of the present invention;
FIG. 2 is an enlarged view of the alignment head of FIG. 1;
FIG. 3 is an enlarged view of the inner stretcher roller of FIG. 2;
FIG. 4 is a schematic cross-sectional view taken along line A-A of FIG. 3;
fig. 5 is a schematic cross-sectional view of a joint between a radial rod and an axial rod in the rounding device for the socket end of the cast iron pipe provided in the embodiment of the present invention;
FIG. 6 is a schematic cross-sectional view taken along line B-B of FIG. 5;
fig. 7 is a schematic structural view of a first driving mechanism in the rounding device for the socket end of the cast iron pipe provided by the embodiment of the present invention.
In the figure: 1. a base; 2. a first drive mechanism; 21. a support wheel; 22. pressing the driving wheel; 3. correcting the head; 4. a cast iron pipe; 5. an inner support roller; 6. a second drive mechanism; 61. a radial rod; 611. a guide block; 62. an axial rod; 621. a wedge-shaped surface; 622. a conformal clamping groove; 63. a second power unit; 64. a connecting shaft; 65. a contact roller; 7. a slide block.
Detailed Description
In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1 to 4, a round calibration device for a socket end of a cast iron pipe according to the present invention will now be described. The rounding device for the spigot end of the cast iron pipe comprises a base 1, a first driving mechanism 2 and a rounding head 3, wherein the base 1 is used for supporting the cast iron pipe 4 in a rolling mode, the first driving mechanism 2 is arranged on the base 1 and is used for driving the cast iron pipe 4 to rotate by taking the axis of the cast iron pipe 4 as a rotating shaft, and the axis position of the cast iron pipe 4 is kept unchanged; the correcting head 3 is arranged on the base 1 and can move along the axial direction of the cast iron pipe 4 to extend into or withdraw from the spigot end of the cast iron pipe 4, a plurality of inner support rollers 5 are arranged on the correcting head 3, the axes of the inner support rollers 5 are parallel to the axis of the cast iron pipe 4, the inner support rollers 5 are distributed on a cylindrical surface coaxial with the cast iron pipe 4 and can move radially, and the inner support rollers 5 are used for being close to and in rolling contact with the inner wall of the cast iron pipe 4 when the correcting head 3 extends into the spigot end.
Compared with the prior art, the rounding device for the spigot end of the cast iron pipe is provided with the rounding head 3 which can extend into the spigot end of the cast iron pipe 4, the rounding head 3 is provided with a plurality of inner supporting rollers 5 which are distributed along the cylindrical surface, and the inner supporting rollers 5 can radially extend and retract; when in roundness correction, the cast iron pipe 4 rotates around the self axis around the axis under the driving of the first driving mechanism 2, the correcting head 3 extends into the socket end of the cast iron pipe 4 under the retraction state of the inner supporting roller 5, then the inner supporting roller 5 extends out radially at the same time to ensure that the inner supporting roller 5 is always positioned on the same cylindrical surface, when the roller surface of the inner supporting roller 5 is in rolling contact with the inner wall of the cast iron pipe 4, the correcting force can be generated on the cast iron pipe 4 to repair the shape error, when the extending distance of the inner supporting roller 5 is matched with the inner diameter of the cast iron pipe 4, the extension is stopped, and a period of time is kept to ensure that the shape of the socket end is completely corrected; the utility model provides a school circle device compares the manual work and need not repeat the measurement and press with the part, has improved school circle efficiency to interior dancer roll 5 is located same face of cylinder, relies on its position to guarantee that the socket end rectifies to anticipated circular, has improved the school circle precision.
As shown by dotted lines in fig. 4, the outer ends of the inner stretching rollers 5 are located on the same cylindrical surface, which is a circle correcting surface, and the radius of the circle correcting surface is reduced or increased along with the expansion and contraction of the inner stretching rollers 5. During the circle calibration, the inner support roller 5 gradually extends out, the radius of the circle calibration surface gradually increases, and the state that the extending distance of the inner support roller 5 is matched with the inner diameter of the cast iron pipe 4 is achieved until the radius of the circle calibration surface is equal to the inner diameter of the cast iron pipe 4.
Specifically, the number of the inner supporting rollers 5 is at least six, and the more the inner supporting rollers 5 are, the more uniform the correction force on the inner wall of the cast iron pipe 4 is, and the better the rounding effect is. However, too many inner stretching rollers 5 cause the mechanism complexity to be too large, the processing and manufacturing cost to be increased, and the number of the inner stretching rollers 5 can be flexibly grasped according to the actual situation in the actual use.
As a specific implementation manner of the cast iron pipe socket end rounding device provided by the present invention, please refer to fig. 1 to 4, a second driving mechanism 6 for driving the inner support roller 5 to move radially is disposed on the rounding head 3, the second driving mechanism 6 includes a radial rod 61 and an axial rod 62, the radial rod 61 is slidably disposed on the rounding head 3 and is disposed along the radial direction of the cast iron pipe 4, the first end of the radial rod 61 is close to the center of a circle, the second end is far away from the center of a circle, and the inner support roller 5 is rotatably disposed at the second end; one end of the axial rod 62 is positioned inside the aligning head 3 and is provided with a wedge surface 621, the wedge surface 621 is in contact with the first end, the other end of the axial rod is positioned outside the aligning head 3 and is connected with a second power unit 63, and the second power unit 63 is used for driving the axial rod 62 to move along the axial direction of the cast iron pipe 4, so that the axial position of the wedge surface 621 is changed, and the radial rod 61 is driven to move radially.
In fig. 1 to 4, when the axial rod 62 moves leftward, the wedge surface 621 pushes the first end of the radial rod 61, and the radial rod 61 gradually extends outward along the radial direction, so that the inner supporting roller 5 approaches and rolls and contacts the inner wall of the cast iron pipe 4 to generate a pressing force on the inner wall of the cast iron pipe 4, thereby achieving the purpose of rounding.
Specifically, the second power unit 63 may be a hydraulic cylinder, and a pushing end of the hydraulic cylinder is connected to the axial rod 62 and drives the axial rod 62 to move axially. Specifically, the second end of the radial rod 61 is provided with a guide block 611, the cross section of the radial rod 61 can be circular, and the guide block 611 can be rectangular, so that the radial rod 61 can be positioned and guided, and when the inner support roller 5 rolls and extrudes the inner wall of the cast iron pipe 4, the radial rod 61 can bear the huge reaction force of the inner wall, thereby ensuring that the positions and the forms of the other directions of the inner support roller 5 are fixed except for radial movement and are always positioned on the same cylindrical surface, and further being capable of accurately calibrating the circle; the correction head 3 is provided with radial runners adapted to the shape of the radial rod 61 and the guide block 611.
As a specific implementation manner of the round calibration device for the socket end of the cast iron pipe, please refer to fig. 5 and 6, the first end of the radial rod 61 is provided with the contact roller 65, the contact roller 65 is in rolling contact with the wedge surface 621, so as to ensure that the first end of the radial rod 61 slides smoothly with the wedge surface 621, and the axial rod 62 can smoothly drive the radial rod 61 to move radially during axial movement. The plurality of wedge faces 621 constitute a regular polygon.
Specifically, the first end of each radial rod 61 is provided with two contact rollers 65, and the radial rod 61 is connected with the two contact rollers 65 through the connecting shaft 64.
As a specific implementation manner of the rounding device for the socket end of the cast iron pipe provided by the present invention, please refer to fig. 5 and 6, the wedge surface 621 is provided with a shape-following slot 622, and the shape-following slot 622 is connected with the contact roller 65 in a rolling manner to drive the radial rod 61 to radially extend and retract. The conformal notch 622 extends from the end of the axial rod 62 inside the alignment head 3, following the shape of the axial rod 62, past the wedge surface 621. The cross section of the conformal clamping groove 622 is in a T shape and can be matched with the clamping contact roller 65, so that the radial rod 61 can not only extend outwards along the radial direction under the outward extrusion of the wedge-shaped surface 621, but also retract inwards along the radial direction under the clamping of the conformal clamping groove 622. Because the cross-section of the conformal clamping groove 622 is T-shaped, the contact roller 65 can be in rolling clamping connection, and the radial rod 61 can extend out of the conformal clamping groove 622 and is in sliding connection with the school round head 3.
As a specific embodiment of the utility model provides a rounding device is held to cast-iron pipe socket, is equipped with pressure sensor on the radial pole 61, and pressure sensor receives when being used for detecting the inner wall rolling contact of interior dancer roll 5 and cast-iron pipe 4. The pressure sensor is the prior art, the radial rod 61 can be divided into two sections, and the pressure sensor is arranged between the two sections and connects the two sections into a whole, so that the pressure sensor can sense the pressure transmitted from the inner support roller 5.
When the shape of the spigot end of the cast iron pipe 4 is not circular, some inner support rollers 5 are in close contact with the inner wall at the same time, some inner support rollers are loose, and the pressures applied to the inner support rollers 5 are different; after the roundness correction is completed, the pressure applied to the inner supporting roller 5 is approximately the same at the same moment, so that whether the roundness correction is completed or not can be judged by arranging the pressure sensor, the judgment is more accurate compared with the judgment through experience, and the roundness correction precision is improved.
As a specific implementation manner of the round checking device for the socket end of the cast iron pipe, please refer to fig. 3, the round checking head 3 is a revolving structure with an axis parallel to the cast iron pipe 4, a radial slide and an axial center slide are provided on the round checking head 3, the radial rod 61 is slidably disposed in the radial slide, and the axial rod 62 is slidably disposed in the axial center slide. Smooth radial sliding of the radial rod 61 and axial sliding of the axial rod 62 are ensured.
As a specific implementation manner of the round checking device for the socket end of the cast iron pipe, the radius of the round checking head 3 is smaller than the inner diameter of the cast iron pipe 4, and the difference value is not more than 10 cm. The inner support roller 5 is approximately positioned on the surface of the circle correcting head 3 when retracting to limit, the smaller the radius of the circle correcting head 3 is, the larger the telescopic distance of the radial rod 61 is, and the larger the diameter range of the circle correcting device which can adapt to the cast iron pipe 4 is. But this increases the complexity of the mechanism and the cost of the apparatus. The difference value of 10 centimeters can meet the requirement of general circle correction, and the mechanism complexity is moderate.
As a specific implementation manner of the round calibration device for the socket end of the cast iron pipe, please refer to fig. 1 and 2, the base 1 is provided with the slider 7 capable of sliding axially along the cast iron pipe 4, the calibration head 3, the axial rod 62 and the second power unit 63 are all disposed on the slider 7, and the base 1 is provided with the third power unit for driving the slider 7. The third power unit may be a hydraulic cylinder as the second power unit 63.
As a specific embodiment of the rounding device for the socket end of the cast iron pipe provided by the present invention, please refer to fig. 1 and 7, the first driving mechanism 2 includes a supporting wheel 21 and a pressing driving wheel 22, the supporting wheel 21 is arranged below the cast iron pipe 4 to roll and support the cast iron pipe 4; the pressure driving wheel 22 is used for pressing the cast iron pipe 4 from above and is connected with a first driving unit for driving the pressure driving wheel 22 to rotate. The first drive unit may be an electric motor. The pressing driving wheel 22 is arranged beside the base 1 through a lifting translation mechanism, the cast iron pipe 4 is lifted by a crown block and placed on the supporting wheel 21 from top to bottom during roundness correction, then the pressing driving wheel 22 moves to the position above the cast iron pipe 4 through the lifting translation mechanism, and the pressing cast iron pipe 4 drives the cast iron pipe 4 to rotate by utilizing friction force.
The supporting wheel 21 and the pressing driving wheel 22 may be made of hard engineering plastics, which not only can protect the surface of the cast iron pipe 4, but also has enough friction to drive the cast iron pipe 4 to rotate.
As a specific embodiment of the rounding device for the socket end of the cast iron pipe provided by the present invention, please refer to fig. 1 and 7, the supporting wheel 21 and the pressing driving wheel 22 are cylinder structures with axes parallel to the cast iron pipe 4, and the supporting wheel 21 and the pressing driving wheel 22 are finished in a zigzag structure when viewed along the axial direction of the cast iron pipe 4. The supporting wheels 21 are in a group, and the number of the pressing driving wheels 22 is one, so that the first driving mechanism 2 can limit the cast iron pipe 4 while driving the cast iron pipe 4 to rotate, and the axial position of the cast iron pipe 4 is ensured to be kept unchanged relative to the base 1. The positions of the circle correcting head 3 and the base 1 are relatively determined, so that the positions of the circle correcting head 3 and the cast iron pipe 4 are relatively fixed, and the circle correcting precision is ensured.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. Cast iron pipe socket end school circle device, its characterized in that includes:
the base is used for rolling and supporting the cast iron pipe;
the first driving mechanism is arranged on the base and used for driving the cast iron pipe to rotate by taking the axis of the cast iron pipe as a rotating shaft, and the position of the axis of the cast iron pipe is kept unchanged; and
the correcting head is arranged on the base and can move along the axial direction of the cast iron pipe to extend into or withdraw from the socket end of the cast iron pipe, a plurality of inner support rollers are arranged on the correcting head, the axes of the inner support rollers are parallel to the axis of the cast iron pipe, the inner support rollers are distributed on a cylindrical surface coaxial with the cast iron pipe and can move in the radial direction, and the inner support rollers are used for being close to and in rolling contact with the inner wall of the cast iron pipe when the correcting head extends into the socket end.
2. The round correction device for the spigot end of the cast iron pipe as claimed in claim 1, wherein a second driving mechanism for driving the inner spreader roll to move radially is provided on the round correction head, the second driving mechanism comprising:
the radial rod is arranged on the circle correcting head in a sliding mode and arranged along the radius direction of the cast iron pipe, the first end of the radial rod is close to the circle center, the second end of the radial rod is far away from the circle center, and the inner supporting roller is rotatably arranged at the second end; and
and one end of the axial rod is positioned in the aligning head and is provided with a wedge-shaped surface, the wedge-shaped surface is contacted with the first end, the other end of the axial rod is positioned outside the aligning head and is connected with a second power unit, and the second power unit is used for driving the axial rod to move along the axial direction of the cast iron pipe, so that the axial position of the wedge-shaped surface is changed, and the radial rod is driven to move in the radial direction.
3. The cast iron pipe spigot end rounding device of claim 2, wherein said first end is provided with contact rollers which are in rolling contact with said wedge faces.
4. The cast iron pipe spigot end rounding device as claimed in claim 3, wherein said wedge surface is provided with a conformal slot, said conformal slot is in rolling engagement with said contact roller to drive said radial rod to radially extend and retract.
5. The apparatus for rounding the socket end of a cast iron pipe as claimed in claim 2, wherein said radial rods are provided with pressure sensors for detecting the pressure applied to said inner spreader roll when it is in rolling contact with the inner wall of the cast iron pipe.
6. The cast iron pipe spigot end rounding device as claimed in claim 2, wherein the rounding head is a revolving body structure with an axis parallel to the cast iron pipe, a radial slideway and an axial central slideway are arranged on the rounding head, the radial rod is slidably arranged in the radial slideway, and the axial rod is slidably arranged in the axial central slideway.
7. The apparatus for rounding the socket end of a cast iron pipe as claimed in claim 6, wherein said rounding head has a radius smaller than the inner diameter of the cast iron pipe by a difference of not more than 10 cm.
8. The cast iron pipe spigot end rounding device as claimed in claim 2, wherein a slider capable of sliding in the axial direction of the cast iron pipe is provided on the base, the rounding head, the axial rod and the second power unit are provided on the slider, and a third power unit for driving the slider is provided on the base.
9. The cast iron pipe spigot end rounding device as claimed in claim 1, wherein said first drive mechanism comprises:
the supporting wheel is arranged below the cast iron pipe and used for supporting the cast iron pipe in a rolling manner; and
and the pressing driving wheel is used for pressing the cast iron pipe from the upper part and is connected with a first driving unit, and the first driving unit is used for driving the pressing driving wheel to rotate.
10. The apparatus for rounding the socket end of a cast iron pipe as claimed in claim 9, wherein said supporting wheel and said pressing driving wheel are both of a cylindrical structure having an axis parallel to the axis of the cast iron pipe, and said supporting wheel and said pressing driving wheel form a delta-shaped structure when viewed in the axial direction of the cast iron pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120581674.0U CN215236927U (en) | 2021-03-22 | 2021-03-22 | Rounding device for spigot end of cast iron pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120581674.0U CN215236927U (en) | 2021-03-22 | 2021-03-22 | Rounding device for spigot end of cast iron pipe |
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| CN215236927U true CN215236927U (en) | 2021-12-21 |
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| CN202120581674.0U Active CN215236927U (en) | 2021-03-22 | 2021-03-22 | Rounding device for spigot end of cast iron pipe |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115815376A (en) * | 2022-12-09 | 2023-03-21 | 江苏中通管业有限公司 | Roundness correction device and steel pipe production process |
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2021
- 2021-03-22 CN CN202120581674.0U patent/CN215236927U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115815376A (en) * | 2022-12-09 | 2023-03-21 | 江苏中通管业有限公司 | Roundness correction device and steel pipe production process |
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